Patent Publication Number: US-11661752-B2

Title: Ceramic tile leveling bracket, pushing and clamping pliers, and ceramic tile leveling and laying system

Description:
The present application is a continuation application of the earlier U.S. patent application Ser. No. 16/470,512 filed on 17 Jun. 2019, the U.S. patent application Ser. No. 16/470,512 being under examination, and is the PCT application of the international application No. PCT/CN2017/096189 filed on 7 Aug. 2017 for national phase conversion based on 35 U.S.C. § 371. The PCT application is published in Chinese. The all contents of each of the applications are incorporated by reference herein. 
    
    
     FIELD OF THE INVENTION 
     The present application relates to a ceramic tile laying tool, and in particular to a ceramic tile leveling bracket, pushing and clamping pliers, and a ceramic tile leveling and laying system. 
     DESCRIPTION OF THE PRIOR ART 
     Ceramic tile inlaying processes often used in the building decoration industry mainly use the traditional manual paving method. The common method for paving floor ceramic tiles is generally divided into a dry laying method and a wet laying method. 
     The wet laying method uses cement mortar or the like as an adhesive to directly paste the ceramic tile to a wall or a floor. The shortcomings lie in that the flatness and fullness of the paved ceramic tile are relatively poor, and the viscosity thereof is also poor, such that it can only be applied to the pasting of small ceramic tiles, and has a large limitation; and, the workload in the pasting process is relatively large, the technical requirements for the construction personnel are high, and the construction efficiency is low. 
     The dry laying method directly lays ceramic tiles of a larger size and area, such as floor tiles, on a flat and dried floor. The shortcomings lie in that the thickness of the required laying materials is relatively great, the requirements for the floor flatness are higher, it is necessary to use a sufficient amount of cement to level the entire floor, which requires a high technical level for the construction personnel and the phenomenon of waste of materials is more serious, and if the flatness is not enough, it is easy to produce a hollowing phenomenon, which affects the quality of the laying; and it is necessary to wait for the cement to solidify and dry before starting laying of ceramic tiles and also tamp the ceramic tiles with a rubber hammer after laying, such that the process is complicated, the workload is large, the laying speed is slow, and the construction efficiency is low. 
     There is a need in the market for a device capable of assist in ceramic tile laying, which can quickly achieve ceramic tile leveling and improve the construction efficiency. 
     SUMMARY OF THE INVENTION 
     An object of the present application is to provide a ceramic tile leveling and laying device, which solves the problems of the prior art, such as complicated leveling and laying processes, low laying efficiency, and high technical requirements for operators. 
     In order to solve the above technical problems, the present application provides a ceramic tile leveling and laying system, comprising: a ceramic tile leveling bracket disposed at the junction of two adjacent ceramic tiles; an insertion block, with one end thereof being inserted into an insertion block through-hole of the ceramic tile leveling bracket; and a pair of pushing and clamping pliers used to push and clamp the insertion block into the insertion block through-hole such that a bottom face of the insertion block is tangent to upper surfaces of the two ceramic tiles. 
     In order to solve the above technical problems, the present application further provides a ceramic tile leveling bracket, comprising: a pad used to support bottom faces of two adjacent ceramic tiles; an insert protruding from the middle line of an upper surface of the pad and used to be inserted into a gap between the two adjacent ceramic tiles; and a breakable connecting portion located at a lower portion of the insert and close to the pad; wherein the insert comprises: an insertion block through-hole which penetrates the insert and into which an insertion block is inserted; and/or a bayonet disposed at a lateral side of the insert on one or both sides, with the height of the bayonet being greater than the height of the sheet. 
     Further, in various embodiments, the insert further comprises a hook-shaped engagement block disposed at a lateral side of the insert on one or both sides and protruding toward the bayonet; wherein the bottom of the bayonet is arc-shaped, and a portion, close to the hook-shaped engagement block, of the bayonet forms a hook-shaped bayonet portion. 
     Further, in various embodiments, the insert comprises a linear groove downwardly recessed from a surface of the insert on one or both sides, with the bottom of the linear groove being the connecting portion. 
     Further, in various embodiments, a bottom face of the pad is an arc-shaped surface and is part of a cylindrical side face; and two ends of the pad extend upward from the middle of the bottom face to make contact with the bottom faces of the ceramic tiles. 
     Further, in various embodiments, the pad comprises: reinforcing ribs disposed at the tops of the two ends of the pad; and/or a pad through-hole penetrating the pad. 
     Further, in various embodiments, the longitudinal cross-section of the insertion block is wedge-shaped and comprises: an insertion block bottom face, which is a flat surface; an insertion block top face, which is an inclined flat surface and forms an acute angle with the insertion block bottom face; and two or more serrations protruding from the insertion block top face and arranged in the same straight line, wherein each of the serration comprises a vertical serration face and an inclined serration face, and the vertical serration face is perpendicular to the insertion block bottom face. 
     In order to solve the technical problem of inserting and clamping the insertion block into the insertion block through-hole, the present application further provides pushing and clamping pliers, comprising: a first component comprising a first clamping portion and a first handheld portion; a second component comprising a second clamping portion and a second handheld portion; and a pivot via which the second clamping portion is rotatably connected to the first clamping portion; a first clamping block disposed at a top end of the first clamping portion; a second clamping block disposed at a top end of the second clamping portion and disposed opposite the first clamping block; a first groove downwardly recessed from an inner side wall of the first clamping block, with the direction of opening of the clamping groove facing the second clamping block; and a second groove penetrating the second clamping block and disposed opposite the clamping groove. 
     Further, in various embodiments, the pushing and clamping pliers further comprise a pulling device used to break the sheet of the ceramic tile leveling bracket to remove the portion, above the sheet, of the insert. 
     Further, in various embodiments, the pulling device comprises: a hooked corner portion protruding in a barbed shape from an outer side wall of the first clamping block; and a rounded corner portion disposed at the junction of a side wall and the top of the second clamping block; or the pulling device comprises: a hooked corner portion protruding in a barbed shape from an outer side wall of the second clamping block; and a rounded corner portion disposed at the junction of a side wall and the top of the first clamping block. 
     Further, in various embodiments, the pushing and clamping pliers further comprise: clamping teeth disposed at an inner side face of the first clamping block and disposed opposite the second clamping block; and/or disposed at an inner side face of the second clamping block and disposed opposite the first clamping block. 
     Further, in various embodiments, the pushing and clamping pliers further comprise an elastic member, with one end thereof being connected to the first clamping portion and the other end thereof being connected to the second clamping portion, or with one end thereof being connected to the first handheld portion and the other end thereof being connected to the second handheld portion. 
     Further, in various embodiments, the pushing and clamping pliers further comprise: a first guiding post protruding from a side face of the first clamping portion; and a second guiding post protruding from a side face of the second clamping portion and disposed opposite the first guiding post; wherein the elastic member is a coil spring, with one end thereof being sheathed over the first guiding post, and the other end thereof being sheathed over the second guiding post. 
     Further, in various embodiments, the pushing and clamping pliers further comprise: a first guiding post protruding from a side face of the first handheld portion; and a second guiding post protruding from a side face of the second handheld portion and disposed opposite the first guiding post; wherein the elastic member is a coil spring, with one end thereof being sheathed over the first guiding post, and the other end thereof being sheathed over the second guiding post. 
     Further, in various embodiments, the pushing and clamping pliers further comprise a locking device used to switch the pushing and clamping pliers between opened and closed states; when the locking device is locked, the elastic force of the elastic member is overcome, so that the pushing and clamping pliers are in a closed state; and when the locking device is unlocked, the pushing and clamping pliers are in an opened state under the action of the elastic force of the elastic member. 
     Further, in various embodiments, the pushing and clamping pliers further comprise: a first bent portion, which is part of the first clamping portion and is sheathed outside the pivot; and a second bent portion, which is part of the second clamping portion and is sheathed outside the pivot. 
     Further, in various embodiments, the locking device comprises: a locking slot disposed at an outer side wall of the first bent portion; a locking member rotatably fitted to a surface of the end of the second clamping portion and disposed opposite the locking slot; and a blocking block disposed at a surface of the end of the first clamping portion and disposed opposite the second bent portion, wherein when the pushing and clamping pliers have the maximum opening angle, the blocking block comes into contact with an outer side wall of the second bent portion. 
     Further, in various embodiments, the locking device comprises: a locking slot disposed at an outer side wall of the second bent portion; a locking member rotatably fitted to a surface of the end of the first clamping portion and disposed opposite the locking slot; and a blocking block disposed at a surface of the end of the second clamping portion and disposed opposite the first bent portion, wherein when the pushing and clamping pliers have the maximum opening angle, the blocking block comes into contact with an outer side wall of the first bent portion. 
     Further, in various embodiments, the locking member comprises: a locking member body rotatably connected to the end of the first clamping portion or the second clamping portion via a second pivot; a locking engagement block protruding from a surface of the locking member body; and a tab protruding from the surface of the locking member body to drive the locking member body to rotate. 
     Further, in various embodiments, the locking device is locked when the locking engagement block is engaged into the locking slot; and the locking device is unlocked when the locking engagement block is disengaged from the locking slot. 
     Another object of the present application is to provide a ceramic tile leveling and laying device that can be applied when at least two adjacent ceramic tiles are laid, which can improve the efficiency while saving the user&#39;s physical strength. 
     In order to solve the above technical problems, the present application provides a ceramic tile leveling and laying system, comprising: 
     a ceramic tile leveling bracket configured to be able to be disposed at the junction of at least two adjacent ceramic tiles; 
     an insertion block, configured to be inserted into the ceramic tile leveling bracket; and 
     a pair of pushing and clamping pliers, which is used to push and clamp the insertion block into the ceramic tile leveling bracket such that a bottom face of the insertion block is tangent to upper surfaces of the at least two adjacent ceramic tiles; 
     wherein the ceramic tile leveling bracket comprises: 
     a pad, with an upper surface of the pad being configured to be able to come into contact with lower surfaces of the at least two adjacent ceramic tiles to support the ceramic tiles; 
     an insert provided on the upper surface of the pad and configured to pass through a gap between the adjacent the ceramic tiles; the insert comprises at least one insertion block receiving portion used to receive the insertion block; and 
     a connecting portion provided on the insert and configured to break under an action of an external force so that at least part of the insert is separated from the pad; 
     wherein the insertion block is wedge-shaped and has a first end and a second end lower than the first second, and a bottom surface of the insertion block in contact with the ceramic tile is a flat surface; the insertion block comprising a protrusion and at least one serration portion, wherein the serration portion comprising: a serration portion top face, which is an inclined surface relative to the bottom surface of the insertion block and forms an acute angle with the bottom surface of the insertion block; and at least two serrations protruding from a top face of the serration portion; and wherein the protrusion is located on the first end of the insertion block; 
     wherein the pushing and clamping pliers comprises: 
     a first component comprising a first clamping portion and a first handheld portion; 
     a second component comprising a second clamping portion and a second handheld portion; 
     a pivot via which the second clamping portion is rotatably connected to the first clamping portion; 
     a first clamping block disposed at a top end, away from the first handheld portion, of the first clamping portion; 
     a second clamping block disposed at a top end, away from the second handheld portion, of the second clamping portion; 
     a first groove inwardly recessed from an inner side wall of the first clamping block, with the direction of opening of the clamping groove facing the second clamping portion; and 
     a second groove, which penetrates the second clamping block toward the first clamping block and is disposed opposite the first groove; 
     the first groove and the second groove being configured to hold the insertion block when the pushing and clamping pliers push the insertion block into the ceramic tile leveling bracket; 
     wherein the first clamping portion extends and bends from the first handheld portion, the second clamping portion extends and bends from the second handheld portion, and the first clamping portion and the second clamping portion bend in the same direction. 
     Further, the ceramic tile leveling bracket further comprises a rib that is provided on the upper surface of the pad and is separated from the insert, and a projection of the rib on the upper surface of the pad forms an angle with a projection of the insert on the upper surface of the pad; and the bottom surface of the insertion block is provided with a strip groove. 
     The ceramic tile leveling bracket can be used for laying three or four ceramic tiles at the same time by setting the rib. Specifically, the ceramic tile leveling bracket is arranged in the adjacency of three or four ceramic tiles, so that the rib is located between two of the ceramic tiles, and the work efficiency can be improved. The groove provided on the bottom surface of the insertion block can be matched with the rib, so that when the insertion block is inserted into the insert, the bottom surface of the insertion block is tangent to the upper surface of the ceramic tiles, and will not be affected by the rib. 
     In order to solve the above problems, the present application further provides a ceramic tile leveling bracket, comprising: 
     a pad, with an upper surface of the pad being configured to be able to come into contact with lower surfaces of at least two adjacent ceramic tiles to support the ceramic tiles; 
     an insert provided on the upper surface of the pad and configured to pass through a gap between the adjacent the ceramic tiles; and 
     a connecting portion provided on the insert and configured to break under an action of an external force so that at least part of the insert is separated from the pad; wherein the insert comprises: 
     at least one insertion block receiving portion used to receive an insertion block. 
     Further, in various embodiments, the insertion block receiving portion comprises: a first insertion block receiving portion provided in the insert; and/or 
     a second insertion block receiving portion provided on at least one side of the insert in the lengthwise direction of the insert. 
     Further, in various embodiments, a thickness of the connecting portion is less than a thickness of the insert so as to form a linear groove in the insert. 
     Further, in various embodiments, the ceramic tile leveling bracket further comprises a rib that is provided on the upper surface of the pad and is separated from the insert, and a projection of the rib on the upper surface of the pad forms an angle with a projection of the insert on the upper surface of the pad. 
     Further, in various embodiments, the rib is located between an outer edge of the pad and the insert, the insert having a first surface and a second surface, the first surface referring to a surface of the insert facing the rib, the second surface referring to a surface of the insert opposite to the first surface, a first end of the rib not exceeding the outer edge of the pad, and a second end of the rib not exceeding the second surface of the insert. 
     Further, in various embodiments, the first end of the rib does not exceed a first outer edge of the pad, and the second end of the rib does not exceed a second outer edge, opposite the first outer edge, of the pad. 
     Further, in various embodiments, the pad comprises at least one pad groove that penetrates the pad in the thickness direction of the pad, and the pad groove is disposed on a lateral side, facing the ceramic tile, of the pad. 
     Further, in various embodiments, the insertion block is wedge-shaped and has a first end and a second end lower than the first second, and a bottom surface of the insertion block in contact with the ceramic tile is a flat surface; the insertion block comprising a protrusion and at least one serration portion wherein the serration portion comprising: 
     a serration portion top face, which is an inclined surface relative to the bottom surface of the insertion block and forms an acute angle with the bottom surface of the insertion block; 
     at least two serrations protruding from a top face of the serration portion; 
     wherein the protrusion is located on the first end of the insertion block. 
     Further, in various embodiments, the bottom surface of the insertion block is provided with a strip groove. 
     In order to solve the above problems, the present application further provides pushing and clamping pliers used to push an insertion block into a ceramic tile leveling bracket, the pushing and clamping pliers comprising: 
     a first component comprising a first clamping portion and a first handheld portion; 
     a second component comprising a second clamping portion and a second handheld portion; 
     a pivot via which the second clamping portion is rotatably connected to the first clamping portion; 
     a first clamping block disposed at a top end, away from the first handheld portion, of the first clamping portion; 
     a second clamping block disposed at a top end, away from the second handheld portion, of the second clamping portion; 
     a first groove inwardly recessed from an inner side wall of the first clamping block, with the direction of opening of the clamping groove facing the second clamping portion; and 
     a second groove, which penetrates the second clamping block toward the first clamping block and is disposed opposite the first groove; 
     the first groove and the second groove being configured to hold the insertion block when the pushing and clamping pliers push the insertion block into the ceramic tile leveling bracket; 
     wherein the first clamping portion extends and bends from the first handheld portion, the second clamping portion extends and bends from the second handheld portion, and the first clamping portion and the second clamping portion bend in the same direction. 
     Further, in various embodiments, the included angle between the first clamping portion and the first handheld portion is an obtuse angle, and the included angle between the second clamping portion and the second handheld portion is an obtuse angle. 
     Further, in various embodiments, the pushing and clamping pliers further comprises an elastic member, one end of the elastic member connected to the first component and another end of the elastic member connected to the second component, the elastic member configured to exert an elastic force to cause the first component and the second component to move in an opening direction. 
     Further, in various embodiments, the pushing and clamping pliers further comprises: 
     a first guiding post protruding from a side face, facing to the second component, of the first component; 
     a second guiding post protruding from the second component and disposed opposite the first guiding post; 
     wherein the elastic member is a spring with one end of the spring being sheathed over the first guiding post, and another end of the spring being sheathed over the second guiding post. 
     Further, in various embodiments, the pushing and clamping pliers further comprise a locking device configured to overcome the elastic force of the elastic member when the locking device is locked, so that the first component and the second component are in a closed state. 
     Further, in various embodiments, further comprising: 
     a first bent portion, which is part of the first clamping portion and is sheathed outside the pivot; and 
     a second bent portion, which is part of the second clamping portion and is sheathed outside the pivot; 
     the locking device comprises: 
     a locking slot disposed on the first clamping portion and located away from an outer side wall of the first bent portion of the first clamping portion; 
     a locking member rotatably connected to the second clamping portion and disposed opposite the locking slot; and 
     a blocking block disposed on the first clamping portion and disposed opposite the second bent portion of the second clamping portion, the blocking block being configured such that when the pushing and clamping pliers have the maximum opening angle, the blocking block comes into contact with the second bent portion of the second clamping portion. 
     Further, in various embodiments, the locking member comprises: 
     a locking member body rotatably connected to the second clamping portion via a second pivot; 
     a locking engagement block protruding from a surface of the locking member body to cooperate with the locking slot; and 
     a tab protruding from the surface of the locking member body to drive the locking member body to rotate. 
     Further, in various embodiments, the locking member comprises: 
     a locking member body rotatably connected to the second clamping portion via a second pivot; 
     a locking engagement block, which has an obtuse angle and is located at a surface of the locking member body to cooperate with the locking slot; 
     a limiting block formed by the surface of the locking member body protruding outward, with a side wall of the limiting block being bent; and 
     a toggle portion used to move the locking member body; the toggle portion being disposed at the surface of the locking member body, a side wall of the toggle portion being inwardly recessed from the surface of the locking member body, and the side wall of the toggle portion being provided with a toothed pattern. 
     Further, in various embodiments, further comprising: a pulling device that comprises a hooked corner portion and a rounded corner portion, the hooked corner portion being in a barbed shape; wherein the hooked corner portion is disposed at one of the first clamping block and the second clamping block, and the rounded corner portion is disposed at the other of the first clamping block and the second clamping block. 
     Further, in various embodiments, further comprising clamping teeth, wherein the clamping teeth are disposed on a side face, facing the second clamping block, of the first clamping block, and/or 
     the clamping teeth are disposed on a side face, facing the first clamping block, of the second clamping block. 
     The present application has the advantages that, by providing a ceramic tile leveling bracket, pushing and clamping pliers and a ceramic tile leveling and laying system, in the ceramic tile laying process, the ceramic tile leveling bracket and the insertion block are used to support the junction of the at least two adjacent ceramic tiles, such that the upper surfaces of multiple ceramic tiles in the same area are kept in the same plane, the operation is simple and convenient, and the laying efficiency and the leveling quality are effectively improved, thereby facilitating large-scale application. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic structural diagram of a ceramic tile leveling and laying system in a use state according to Embodiment 1 of the present application; 
         FIG.  2    is a schematic perspective structural diagram of the ceramic tile leveling bracket according to Embodiment 1 of the present application; 
         FIG.  3    is a schematic diagram of the longitudinal cross-section of the ceramic tile leveling bracket according to Embodiment 1 of the present application; 
         FIG.  4    is a schematic front structural diagram of the ceramic tile leveling bracket according to Embodiment 1 of the present application; 
         FIG.  5    is a schematic cross-sectional structural diagram of an insertion block and an insertion block through-hole according to Embodiment 1 of the present application; 
         FIG.  6    is a schematic structural diagram of pushing and clamping pliers according to Embodiment 1 of the present application; 
         FIG.  7    is a schematic exploded structural diagram of the pushing and clamping pliers according to Embodiment 1 of the present application; 
         FIG.  8    is a schematic side structural diagram of a locking device according to Embodiment 1 of the present application; 
         FIG.  9    is a side view of the ceramic tile leveling and laying system in a use state according to Embodiment 1 of the present application; 
         FIG.  10    is a schematic diagram of the removal of an insert with the pushing and clamping pliers according to Embodiment 1 of the present application; 
         FIG.  11    is a schematic structural diagram of a ceramic tile leveling and laying system in a use state according to Embodiment 2 of the present application; 
         FIG.  12    is a schematic perspective structural diagram of a second ceramic tile leveling bracket according to Embodiment 2 of the present application; 
         FIG.  13    is a front view of the second ceramic tile leveling bracket according to Embodiment 2 of the present application; 
         FIG.  14    is a schematic structural diagram of the second ceramic tile leveling bracket according to Embodiment 2 of the present application from another perspective; 
         FIG.  15    is a schematic enlarged diagram of a second sheet according to Embodiment 2 of the present application; 
         FIG.  16    is a schematic enlarged diagram of the second sheet in use according to Embodiment 2 of the present application; 
         FIG.  17    is a schematic structural diagram of a second insertion block according to Embodiment 2 of the present application; 
         FIG.  18    is a schematic structural diagram of a bottom structure of the second insertion block according to Embodiment 2 of the present application; 
         FIG.  19    is a schematic longitudinal structural diagram of the second insertion block according to Embodiment 2 of the present application; 
         FIG.  20    is a schematic structural diagram of the second insertion block and the second ceramic tile leveling bracket in a use state according to Embodiment 2 of the present application; 
         FIG.  21    is a schematic enlarged diagram of the second insertion block and the second ceramic tile leveling bracket in a use state according to Embodiment 2 of the present application; 
         FIG.  22    is a schematic perspective structural diagram of a third ceramic tile leveling bracket according to Embodiment 3 of the present application; 
         FIG.  23    is a top view of the third ceramic tile leveling bracket according to Embodiment 3 of the present application; 
         FIG.  24    is a schematic structural diagram of the third ceramic tile leveling bracket in use according to Embodiment 3 of the present application; 
         FIG.  25    is a schematic structural diagram of a bottom structure of the third insertion block according to Embodiment 3 of the present application; 
         FIG.  26    is a schematic structural diagram of the third ceramic tile leveling bracket and an insertion block in a use state according to Embodiment 3 of the present application; 
         FIG.  27    is a schematic perspective structural diagram of a fourth ceramic tile leveling bracket according to Embodiment 4 of the present application; 
         FIG.  28    is a top view of the fourth ceramic tile leveling bracket according to Embodiment 4 of the present application; 
         FIG.  29    is a schematic structural diagram of fourth ceramic tile leveling bracket in use according to Embodiment 4 of the present application; 
         FIG.  30    is a schematic structural diagram of the fourth ceramic tile leveling bracket and an insertion block in a use state according to Embodiment 4 of the present application; 
         FIG.  31    is a schematic perspective structural diagram of a fifth ceramic tile leveling bracket according to Embodiment 5 of the present application; 
         FIG.  32    is a top view of the fifth ceramic tile leveling bracket according to Embodiment 5 of the present application; 
         FIG.  33    is a schematic structural diagram of the fifth ceramic tile leveling bracket in a use state according to Embodiment 5 of the present application; 
         FIG.  34    is a schematic perspective structural diagram of a sixth ceramic tile leveling bracket according to Embodiment 6 of the present application; 
         FIG.  35    is a top view of the sixth ceramic tile leveling bracket according to Embodiment 6 of the present application; 
         FIG.  36    is a schematic structural diagram of the sixth ceramic tile leveling bracket in a use state according to Embodiment 6 of the present application; 
         FIG.  37    is a schematic structural diagram of second pushing and clamping pliers according to Embodiment 7 of the present application; 
         FIG.  38    is a schematic structural diagram of the second pushing and clamping pliers according to Embodiment 7 of the present application from another perspective; 
         FIG.  39    is a schematic exploded diagram of the second pushing and clamping pliers according to Embodiment 7 of the present application; 
         FIG.  40    is a schematic structural diagram of a second locking member body according to Embodiment 7 of the present application; 
         FIG.  41    is a schematic cross-sectional diagram of a second locking device according to Embodiment 7 of the present application; 
         FIG.  42    is a schematic enlarged diagram of the second locking device after being mounted according to Embodiment 7 of the present application; 
         FIG.  43    is a rear view of the second pushing and clamping pliers according to Embodiment 7 of the present application; 
         FIG.  44    is a schematic structural diagram of the second pushing and clamping pliers in a use state according to Embodiment 7 of the present application; 
         FIG.  45    is a schematic structural diagram of a second pulling device according to Embodiment 7 of the present application; 
         FIG.  46    is a schematic structural diagram of the second pulling device in a use state according to Embodiment 7 of the present application; 
         FIG.  47    is a schematic structural diagram of third pushing and clamping pliers according to Embodiment 8 of the present application; 
         FIG.  48    is a rear view of the third pushing and clamping pliers according to Embodiment 8 of the present application; 
         FIG.  49    is a schematic exploded diagram of a third locking device according to Embodiment 8 of the present application; and 
         FIG.  50    is a schematic structural diagram of the third pushing and clamping pliers in a use state according to Embodiment 8 of the present application. 
     
    
    
     Parts are labeled in the figures as follows:
       1  Ceramic tile leveling bracket,  2  Insertion block,  3  Pushing and clamping pliers,  4  Ceramic tile,  41  Side of ceramic tile,  42  Lower surface of ceramic tile,  43  Gap;     11  Pad,  12  Insert,  13  First connecting portion,  14  Reinforcing rib,  15  Pad through-hole,  16  Insertion block through-hole;     17  Linear groove,  18  Bayonet,  19  Hook-shaped engagement block,  20  Hook-shaped bayonet portion;     210  Serration portion,  21  Serration portion bottom face,  22  Serration portion top face,     23  Serration,  24  Vertical serration face,  25  Inclined serration face;     2101  First end,  2102  Second end,  2103  Protrusion,  31  First component,  32  Second component,  33  Pivot,  34  Clamping teeth,  35  Pulling device,  36  Elastic member;     37  Locking device;     311  First clamping portion,  312  First handheld portion,  313  First clamping block,  314  First groove,  315  First bent portion;     321  Second clamping portion,  322  Second handheld portion,  323  Second clamping block,  324  Second groove,  325  Second bent portion;     351  Hooked corner portion,  352  Rounded corner portion,  361  First guiding post,  362  Second guiding post;     371  Locking slot,  372  Locking member,  373  Blocking block;     3721  Locking member body,  3722  Locking engagement block,  3723  Tab,  3724  Second pivot,  3725  Gasket;     101  Second ceramic tile leveling bracket,  102  Second insertion block;     111  Second pad,  1111  Upper surface of second pad,  1112  First middle line of second pad,  1113  Bottom face of second pad,  1114  Lateral side of second pad,  1115  Pad groove;     112  Second insert,  113  Second connecting portion,  114  Second linear groove,  115  Extension end,  116  First insertion block receiving portion,  117  Limiting portion,  1121  First connection piece,  1122  Second connection piece,  118  Second insertion block receiving portion,  1161  Upper edge of first insertion block receiving portion,  1171  Lower edge of limiting portion,  1181  Upper edge of second insertion block receiving portion,  1120  Insertion block receiving portion;     120  Second serration portion,  121  Bottom face of second insertion block,  122  Serration portion top face,  123  Serration,  124  Serration slot,  125  End portion,  126  Base,  1261  First side of base,  1262  Second side of base,  1263  Second protrusion;     201  Third ceramic tile leveling bracket,  202  Third insertion block;     211  Third pad,  2111  Upper surface of third pad,  2112  Second middle line of third pad,  2113  Outer edge of third pad;     212  Third insert,  216  Third insertion block through-hole;     219  First rib,  2191  First end of first rib,  2192  Second end of first rib;     301  Fourth ceramic tile leveling bracket,  302  Fourth insertion block;     311  Fourth pad,  3111  Upper surface of fourth pad,  3112  Third middle line of fourth pad,  3113  First outer edge of fourth pad,  3114  Fourth outer edge of fourth pad;     312  Fourth insert;     319  Second rib,  3191  First end of second rib,  3192  Second end of second rib;     401  Fifth ceramic tile leveling bracket,  411  Fifth pad,  412  Fifth insert,  4111  Upper surface of fifth pad,  419  Third rib;     601  Sixth ceramic tile leveling bracket,  611  Sixth pad,  612  Sixth insert,  6111  Upper surface of sixth pad,  519  Fourth rib,  5191  First portion of fourth rib,  5192  Second portion of fourth rib;     500  Third pushing and clamping pliers,  501  Third component,  502  Fourth component,  503  Third pivot,  504  Second clamping teeth,  505  Second elastic member,  506  Second locking device,  507  Second blocking block,  508  Second pulling device;     5011  Third clamping portion,  5012  Third handheld portion,  5013  Third clamping block,  5014  Third groove,  5015  Third bent portion,  50131  Side wall of third clamping block,  50132  Top of third clamping block;     5021  Fourth clamping portion,  5022  Fourth handheld portion,  5023  Fourth clamping block,  5024  Fourth groove,  5025  Fourth bent portion,  50231  Side wall of fourth clamping block,  50232  Top of fourth clamping block;     5051  Third guiding post,  5052  Fourth guiding post;     5061  Second locking slot,  5062  Second locking member,  50621  Second locking member body,  50622  Second locking engagement block,  50623  Limiting block,  50624  Toggle portion,  50625  Fourth pivot,  50626  Toothed pattern;     5081  Second hooked corner portion,  5082  Second rounded corner portion;     600  Third pushing and clamping pliers,  606  Third locking device,  607  Third blocking block;     6061  Third locking slot,  6062  Third locking member,  60621  Third locking member body,  60622  Third locking engagement block,  60623  Second tab,  60625  Fifth pivot,  60626  Second gasket.   

     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The preferred embodiments of the present application are described below with reference to the accompanying drawings, and the present application can be fully introduced to those skilled in the art, such that the technical content thereof will be clearer and is easy to understand. The present application can be embodied in various forms of embodiments, and the scope of protection of the present application is not limited to the embodiments mentioned herein. 
     In the drawings, the same reference numeral indicates components having the same structure, and similar reference numerals indicate assemblies having similar structures or functions throughout. The size and thickness of each assembly shown in the figures are shown arbitrarily, and the present application does not define the size and thickness of each assembly. In order to make the illustration clearer, the thickness of the component in some places of the figures is appropriately exaggerated. 
     Orientation terms mentioned in the present application, such as “upper”, “lower”, “front”, “rear”, “left”, “right”, “inner”, “outer”, “side” etc., are merely orientations in the figures and are only intended to explain and illustrate the present application and are not intended to limit the scope of protection of the present application. 
     When a certain assembly is described as “on” a further assembly, the assembly can be placed directly on the further assembly; and there may also be an intermediate assembly on which the assembly is placed, and the intermediate assembly placed on the further assembly. When an assembly is described as “mounted to” or “connected to” a further assembly, it can be understood as either “mounted” or “connected” directly, or an assembly being indirectly “mounted to” or “connected to” the further assembly via an intermediate assembly. 
     Embodiment 1 
     As shown in  FIG.  1   , this embodiment provides a ceramic tile leveling and laying system, comprising a ceramic tile leveling bracket  1 , an insertion block  2  and pushing and clamping pliers  3 , which cooperate with one another to assist in leveling of ceramic tiles  4  in the ceramic tile laying process, such that all the upper surfaces of the ceramic tiles lie in the same plane. 
     During the construction of the ceramic tile laying, a user can apply an adhesive, such as cement and a ceramic tile adhesive, onto a floor or a wall according to requirements, and then multiple ceramic tiles are subsequently laid on the floor or the wall. During laying, a ceramic tile leveling bracket  1  is placed at the junction of any two adjacent ceramic tiles  4 , and taking a square ceramic tile as an example, it is necessary to provide a ceramic tile leveling bracket  1  on each of four sides thereof. 
     As shown in  FIGS.  2 - 4   , the ceramic tile leveling bracket  1  comprises a pad  11  and an insert  12 , which are integrally provided. The insert  12  protrudes from the middle line of the upper surface of the pad  11 . The longitudinal cross-section of the ceramic tile leveling bracket  1  approximates an inverted T-shape. The pad  11  is disposed below two adjacent ceramic tiles  4 , and the insert  12  is inserted into a gap between the two adjacent ceramic tiles  4 . 
     The bottom face of the pad  11  is an arc-shaped surface and is part of a cylindrical side face. Two ends of the pad  11  smoothly extend upward from the middle of the bottom face, and the tops of the two ends of the pad  11  are provided with reinforcing ribs  14  to make contact with and support the bottom faces of the two adjacent ceramic tiles  4 . The pad  11  is provided with two or more pad through-holes  15  which penetrate the pad  11 . In the ceramic tile leveling process, an adhesive under the ceramic tile  4  will enter from the pad through-holes  15  into the space enclosed by the pad  11  and the lower surfaces of the ceramic tiles  4 . During the curing of the adhesive, the pad  11  and the two ceramic tiles  4  are fixed into one body. 
     As shown in  FIGS.  4 - 5   , the middle of the insert  12  is provided with an insertion block through-hole  16 , the insertion block through-hole  16  penetrates the insert  12 , and an insertion block  2  may be inserted into the insertion block through-hole. The longitudinal cross-section of the insertion block  2  is wedge-shaped, and has a first end  2101  and a second end  2102  opposite the first end  2101 . The first end  2101  is higher than the second end  2102 , so that the longitudinal section of the insertion block  2  is wedge-shaped. In the embodiment, the insertion block only comprises one serration portion  210 , which comprises a serration portion bottom face  21  and a serration portion top face  22 . Since the insertion block  2  comprises only one serration portion  210 , the serration portion bottom face  21  is the bottom face of the insertion block  2 , and the serration portion top face  22  is the top face of the insertion block  2 . The serration portion bottom face  21  is a flat surface, and the serration portion top face  22  is an inclined face relative to the serration portion bottom face  21 , and the angle between the serration portion bottom face  21  and the serration portion top face  22  is an acute angle, preferably of 20-30 degrees. The serration portion top face  22  is provided with two or more protruding serrations  23 , and the multiple serrations are arranged in the same straight line. Each of the serrations  23  comprises a vertical serration face  24  and an inclined serration face  25 , the vertical serration face  24  is perpendicular to the serration portion bottom face  21 , and the inclined angle of the inclined serration face  25  is consistent with the inclined angle of the serration portion top face  22 . 
     As shown in  FIG.  1   , after the ceramic tile leveling bracket  1  is fitted into the gap between the two adjacent ceramic tiles  4 , the lower second end  2102  of the insertion block  2  can be inserted into the insertion block through-hole  16 , and the transverse cross-section of the higher first end  2101  of the insertion block  2  is semicircular, forming the protrusion  2103  of the insertion block  2 , which is matched with the pushing and clamping pliers  3 . The user can push the insertion block  2  as far as possible into the insertion block through-hole  16  by means of the pushing and clamping pliers  3 , such that the insert  12  can be engaged into the serration gap between two serrations on the serration portion top face  22  so as to lock the positions of the two ceramic tiles  4 . In the process of gradually pushing the insertion block  2  into the insertion block through-hole  16 , the pad  11  moves in a small range relative to the ceramic tiles  4 , and the ceramic tiles  4  are lifted. The heights of the two ceramic tiles  4  are finely adjusted such that the serration portion bottom face  21  is tangent to the upper surfaces of the two ceramic tiles  4 . At this time, the adhesive under the ceramic tiles  4  is not cured and can flow through the pad through-holes  15  into the space enclosed by the pad  11  and the ceramic tiles  4 . After the adhesive is cured, the pad  11  and the ceramic tiles  4  are fixed into one body. Since the serration portion bottom face  21  is a flat surface, the upper surfaces of the two ceramic tiles  4  are necessarily in the same plane, such that the leveling process of the two ceramic tiles can be completed. 
     In this embodiment, the ceramic tile  4  is rectangular or square, and the junctions between the four sides thereof and the other ceramic tiles can be respectively provided with a ceramic tile leveling bracket  1  according to the above method. In the similar manner, the upper surfaces of all the ceramic tiles laid on the construction site can be positioned in the same plane by means of multiple ceramic tile leveling brackets  1 , and then left to stand for a period of time to cure the adhesive (cement, ceramic tile adhesive, etc.). 
     As shown in  FIGS.  2 - 3   , the lower portion, close to the pad  11 , of the insert  12  is provided with a breakable first connecting portion  13 , the first connecting portion  13  is a thin sheet and is part of the insert  12  and is in the shape of a straight line having a certain width, and the user can tear the first connecting portion  13  along the straight line to break same such that the insert  12  is divided into upper and lower portions from the tear. The height of the first connecting portion  13  is substantially flush with the lower surface of the ceramic tile  4 . 
     The insert  12  further comprises a linear groove  17  inwardly recessed from a surface of the insert  12  on one or both sides, and the bottom of the linear groove  17  is the first connecting portion  13 . With the groove structure of the first connecting portion  13  on one or both sides, the first connecting portion  13  is relatively thin, and has a thickness of generally about 1-2 mm. Such groove structure makes the first connecting portion  13  easy to tear. After the adhesive is cured, the user can violently break or tear the upper portion of the insert  12  from the first connecting portion  13  with a conventional plier tool. 
     As shown in  FIG.  4   , in this embodiment, a lateral side of one side of the insert  12  is provided with a bayonet  18 , or lateral sides of two sides of the insert  12  are respectively provided with a bayonet  18 , and the height of the bayonet  18  is greater than that of the first connecting portion  13 . The insert  12  further comprises a hook-shaped engagement block  19  that is disposed at a lateral side of the insert  11  on one or both sides and protrudes toward the bayonet  18 . The longitudinal cross-section of the bottom of the bayonet  18  is arc-shaped, and a portion, close to the hook-shaped engagement block  19 , of the bayonet  18  forms a hook-shaped bayonet portion  20 . The bottom of the bayonet  18  is a contact edge that can cooperate with an outer edge of a hooked corner portion  351  of the pushing and clamping pliers  3 . The longitudinal cross-section of the bottom of the bayonet  18  is arc-shaped, and the opening end of the arc-shaped contact edge (i.e., the hook-shaped engagement block  19 ) is bent downward. 
     The user can remove the upper part of the insert  12  from the first connecting portion  13  by means of a pulling tool such as a small claw hammer. Specifically, the barbed structure of the pulling tool is used to engage into the bayonet  18  to remove the portion, above the first connecting portion  13 , of the insert based on the lever principle. In this embodiment, a pulling device is provided in the pushing and clamping pliers  3 , and the pulling device has a hook-shaped bayonet portion  20  which can be engaged into the bayonet  18  to quickly and efficiently remove part of the insert, as will be described in detail below. 
     In the construction of ceramic tile laying, after the cement, the ceramic tile adhesive or the like is cured, the inserts  12  of all the ceramic tile leveling brackets  1  are broken from the first connecting portion  13 , and after the upper half of the insert  12  and the insertion block  2  are removed and cleaned, all the gaps between the ceramic tiles are filled and flattened, and the entire process of ceramic tile laying can be completed. The operation is simple, the construction processes can be effectively reduced, and the construction efficiency is improved. 
     In this embodiment, the pushing and clamping pliers  3  are used to push and clamp the insertion block  2  into the insertion block through-hole  16  such that the serration portion bottom face  21  is tangent to the upper surfaces of the two ceramic tiles  4 . 
     As shown in  FIGS.  6  and  7   , the pushing and clamping pliers  3  comprise a first component  31 , a second component  32 , and a pivot  33 . The first component  31  comprises a first clamping portion  311  and a first handheld portion  312 , and the second component  32  comprises a second clamping portion  321  and a second handheld portion  322 , the second clamping portion  311  being rotatably connected to the first clamping portion  311  via the pivot  33 . A top end of the first clamping portion  311  is provided with a first clamping block  313 , and a top end of the second clamping portion  321  is provided with a second clamping block  323 . The second clamping block  323  is disposed at the same height as and opposite the first clamping block  313 . 
     The inner side faces opposite each other of the first clamping block  313  and the second clamping block  323  may be provided with clamping teeth  34 . The clamping teeth  34  of the first clamping block  313  are disposed opposite the second clamping block  323 , and the clamping teeth  34  of the second clamping block  323  are disposed opposite the first clamping block  313 . In other words, the clamping teeth  34  of the first clamping block  313  are opposite the clamping teeth  34  of the second clamping block  323 . The inner side faces opposite each other of the two clamping blocks are clamping faces, and the clamping teeth  34  can increase the coefficient of friction between the clamping faces and the surface of the clamped object, thereby preventing the clamped object from slipping out. 
     As shown in  FIGS.  1  and  6 - 7   , in this embodiment, the inner side wall of the first clamping block  313  is provided with a downwardly recessed first groove  314 , with the direction of opening thereof facing the second clamping block  323 ; and the second clamping block  323  is provided with a second groove  324  that transversely penetrates the entire second clamping block  323 , and the second groove  324  is disposed opposite and in the same straight line as the first groove  314 . Portions, on the two sides and at the bottom of the second groove  324 , of the second clamping block  323  form a bifurcated structure comprising two bifurcated portions, the second groove  324  is located between the two bifurcated portions, and the clamping teeth  34  are provided on the clamping faces on the inner sides of the two bifurcated portions. 
     As shown in  FIG.  9   , the second groove  324  and the first groove  314  are configured to clamp the insertion block  2  such that the insertion block  2  is pushed and clamped into the insertion block through-hole  16  of the ceramic tile leveling bracket  1 . When the lower end of the insertion block  2  is pushed into the insertion block through-hole  16 , the user puts the pushing and clamping plier  3  upside down and opens same, and the protrusion  2103  of the higher first end  2101  of the insertion block  2  is placed in the first groove  314 , the lower second end  2102  of the insertion block  2  is placed in the second groove  324 , and then the two handheld portions  312  and  322  are closed by force. During the closing of the pushing and clamping pliers  3 , the first clamping block  313  pushes the higher end of the insertion block  2  into the insertion block through-hole  16 , the bifurcated portion of the second clamping block  323  is pushed against one side of the insert  12 , and the lower second end  2102  of the insertion block  2  slides through the second groove  324  to secure the insertion block  2  in the insertion block through-hole  16 , such that the insert  12  can be engaged onto a certain serration on the serration portion top face  22 , thereby locking the positions of the two ceramic tiles  4 . 
     In this embodiment, the pushing and clamping pliers  3  further comprise a pulling device  35  for breaking the first connecting portion  13  of the ceramic tile leveling bracket  1  to remove the portion, above the first connecting portion  13 , of the insert  12 . 
     As shown in  FIGS.  6 - 7   , the pulling device  35  comprises a hooked corner portion  351  and a rounded corner portion  352 . The hooked corner portion  351  protrudes in a barbed shape from the outer side wall of the first clamping block  313 , and the outer edge of the hooked corner portion  351  is a smooth flat surface or an arc-shaped curved surface, and is disposed at the junction of the side wall and the top of the first clamping block  313 . The rounded corner portion  352  is disposed at the junction of the side wall and the top of the second clamping block  323 , and each of the two bifurcated portions has a rounded corner portion  352 . Alternatively, the hooked corner portion  351  protrudes in a barbed shape from the outer side wall of the second clamping block  323 , and the two bifurcated portions protrude outwardly and extend to form a hooked corner portion  351 , and the hooked corner portion  351  has an outer edge that is a smooth flat surface or an arc-shaped curved surface, and is disposed at the junction of the side wall and the top of the second clamping block  323 . The rounded corner portion  352  is provided at the junction of the side wall and the top of the first clamping block  313 . 
     In this embodiment, the lateral sides of two sides of the insert  12  are respectively provided with a bayonet  18  and a hook-shaped engagement block  19 , the hook-shaped engagement block  19  is disposed at the upper portion of the bayonet  18  and protrudes toward the bayonet  18 , and a portion, close to the hook-shaped engagement block  19 , of the bayonet  18  forms a hook-shaped bayonet portion  20 . The bottom of the bayonet  18  is a contact edge that can cooperate with an outer edge of a hooked corner portion  351  of the pushing and clamping pliers  3 . The longitudinal cross-section of the bottom of the bayonet  18  is arc-shaped, and the opening end of the arc-shaped contact edge (i.e., the hook-shaped engagement block  19 ) is bent downward. 
     In the ceramic tile laying process, after the adhesive is cured, the pad  11  and the ceramic tiles  4  are all fixed by the adhesive, and the user can remove the upper half of the insert  12  by means of the pulling device  35  of the pushing and clamping pliers  3 . As shown in  FIG.  10   , at first, the user needs to close and lock the pushing and clamping pliers  3 , the hooked corner portion  351  of the pulling device  35  is engaged into the bayonet  18  on the lateral side of the insert  12 , the outer edge of the hooked corner portion  351  slides along the contact edge of the bayonet  18 , the hooked corner portion  351  is engaged into the hook-shaped bayonet portion  20 , and the rounded corner portion  352  of the pulling device  35  is placed on the upper surfaces of the ceramic tiles  4 . Based on the principle of lever, the user can pull the upper half of the insert  12  upward with the rounded corner portion  352  as the fulcrum, and since the lower portion, close to the pad  11 , of the insert  12  is provided with the breakable first connecting portion  13 , when an upward force is applied to the upper portion of the insert  12 , the first connecting portion  13  is torn or broken, such that the portion, above the first connecting portion  13 , of the insert  12  is removed. If the first connecting portion  13  is only torn but not completely broken under the force, since both sides of the insert  12  are provided with the bayonets  18 , the user can repeat the above operation from the other side until the upper portion of the insert  12  is completely removed. 
     As shown in  FIGS.  6 - 7   , in this embodiment, the pushing and clamping pliers  3  further comprise an elastic member  36 , with one end thereof being connected to the first clamping portion  311 , and the other end thereof being connected to the second clamping portion  321 . Alternatively, one end of the elastic member is connected to the first handheld portion  312 , and the other end thereof is connected to the second handheld portion  322 . When the first component  31  and the second component  32  of the pushing and clamping pliers  3  are to be relatively closed, the user only needs to use one hand to apply force to the inner side, but when they are to be relatively opened, the user needs to use two hands at the same time, so the operation is inconvenient. With the elastic member  36  mounted between the first component  31  and the second component  32 , a certain outward tension can be provided between the first component  31  and the second component  32 , such that the user can perform opening and closing operations with one hand. 
     Preferably, this embodiment further comprises a first guiding post  361  and a second guiding post  362  respectively disposed on two opposite side faces of the two handheld portions  312  and  322 . The first guiding post  361  protrudes from the inner side face of the first handheld portion  312 . The second guiding post  362  protrudes from the inner side face of the second handheld portion  322 , and the second guiding post  362  is disposed opposite the first guiding post  361 . The elastic member  36  is preferably a coil spring, with one end thereof being sheathed over the first guiding post  361 , and the other end thereof being sheathed over the second guiding post  362 . In other variant embodiments, the two guiding posts  361 ,  362  may be respectively disposed on two opposite side faces of the two clamping portions  311  and  321 . The first guiding post  361  protrudes from the inner side face of the first clamping portion  311 , the second guiding post  362  protrudes from the inner side face of the second clamping portion  321 , and the second guiding post  362  is disposed opposite the first guiding post  361 . 
     As shown in  FIGS.  6 - 8   , in this embodiment, the pushing and clamping pliers  3  further comprise a locking device  37  used to switch the pushing and clamping pliers  37  between opened and closed states including a closed state and an opened state. When the locking device  37  is locked, the pushing and clamping pliers  3  are in the closed state. When the locking device  37  is unlocked, the pushing and clamping pliers  3  are in the opened state. 
     In this embodiment, the pushing and clamping pliers  3  further comprise a first bent portion  315  and a second bent portion  325 , which are both sheathed outside the pivot, such that the second component  32  is hinged to the first component  31  via the pivot  33 . The first bent portion  315  is part of the first clamping portion  311 , and the second bent portion  325  is part of the second clamping portion  321 . 
     As shown in  FIGS.  6 - 10   , the locking device  37  comprises a locking slot  371 , a locking member  372 , and a blocking block  373 . The locking member  372  and the blocking block  373  are respectively disposed at the ends of the two clamping portions and close to the handheld portions. 
     In this embodiment, preferably, the locking slot  371  is disposed at the outer side wall of the first bent portion  315 , and the locking member  372  is rotatably fitted to the surface of the end of the second clamping portion  321  and is disposed opposite the locking slot  371 . The blocking block  373  is disposed at the surface of the end of the first clamping portion  311  and is disposed opposite the second bent portion  325 . When the pushing and clamping pliers have the maximum opening angle, the blocking block  373  comes into contact with the outer side wall of the second bent portion  325 . 
     As shown in  FIG.  8   , the locking member  372  comprises a locking member body  3721 , a locking engagement block  3722 , and a tab  3723 . The locking member body  3721  may be a metal sheet, and is rotatably connected to the end of the first clamping portion  311  or the second clamping portion  321  via a second pivot  3724 . A gasket  3725  is disposed between the locking member  372  and the first clamping portion  311  or the second clamping portion  321 . The locking member  372  and the clamping portion  311 ,  321  are both made of metal, and the gasket  3725  can assist in the relative rotation of the two, thereby reducing wear between the components. The locking engagement block  3722  protrudes from the front end of the surface of the locking member body  3721 . When the locking engagement block  3722  is engaged into the locking slot  371 , the locking device  37  is locked. When the locking engagement block  3722  is disengaged from the locking slot  371 , the locking device  37  is unlocked. The tab  3723  protrudes from and is perpendicular to the surface of the locking member body  3721 . The user can move the tab  3723  with a finger to drive the locking member body  3721  to rotate, such that the locking engagement block  3722  is engaged into or disengaged from the locking slot  371 . 
     When the pushing and clamping pliers  3  need to be adjusted from the closed state to the opened state, the user can first further close the two handheld portions, and then rotate the tab  3723  counterclockwise, such that the locking engagement block  3722  is disengaged from the locking slot  371  and is therefore unlocked, and the two clamping portions are opened under the action of the elastic member  36  (coil spring). 
     When the pushing and clamping pliers  3  need to be adjusted from the opened state to the closed state, the user can first close the two handheld portions, and then rotate the tab  3723  clockwise, such that the locking engagement block  3722  is engaged into the locking slot  371 , and the two clamping portions are therefore locked in the closed state. 
     Similarly, the locking slot  371  may also be disposed on the outer side wall of the second bent portion  325 , and the locking member  372  is rotatably fitted to the surface of the end of the first clamping portion  311  and disposed opposite the locking slot  371 . The blocking block  373  is disposed on the surface of the end of the second clamping portion  321  and is disposed opposite the first bent portion  315 . When the pushing and clamping pliers have the maximum opening angle, the blocking block  373  comes into contact with the outer side wall of the first bent portion  315 . 
     This embodiment provides a ceramic tile leveling bracket, pushing and clamping pliers, and a ceramic tile leveling and laying system. In the ceramic tile laying process, the ceramic tile leveling bracket and the insertion block are used to support the junction of two adjacent ceramic tiles, such that the upper surfaces of multiple ceramic tiles in the same area are kept in the same plane, the operation is simple and convenient, and the laying efficiency and the leveling quality are effectively improved, thereby facilitating large-scale application. 
     Embodiment 2 
     As shown in  FIG.  11   , this embodiment provides a ceramic tile leveling and laying system, comprising a second ceramic tile leveling bracket  101 , a second insertion block  102 , and pushing and clamping pliers  3 , which cooperate with one another for assist in leveling of ceramic tiles  4  in the ceramic tile laying process, such that all the upper surfaces of the ceramic tiles lie in the same plane. 
     During the construction of the ceramic tile laying, a user can apply an adhesive, such as cement and a ceramic tile adhesive, onto a floor or a wall according to requirements, and then multiple ceramic tiles are subsequently laid onto the floor or the wall. During laying, a second ceramic tile leveling bracket  101  is placed at the junction of at least two adjacent ceramic tiles  4 , and taking a square ceramic tile as an example, it is necessary to provide a second ceramic tile leveling bracket  101  on each of four sides thereof. 
     The pushing and clamping pliers  3  used in the present embodiment is the same as that in the embodiment 1. 
     As shown in  FIG.  12   , the second ceramic tile leveling bracket  101  comprises a second pad  111  and a second insert  112 , which are integrally provided. When the second ceramic tile leveling bracket  101  is placed at the junction of at least two adjacent ceramic tiles  4 , the upper surface  1111  of the second pad  111  comes into contact with the lower surfaces  42  of the ceramic tiles  4  (see  FIG.  16   ) to support the ceramic tiles  4 . 
     The second insert  112  is disposed on the upper surface  1111  of the second pad  111  and is formed by extends from the upper surface  1111  of the second pad  111  away from the second pad  111 , such that the second insert  112  protrudes from the second pad  111 . Preferably, the second insert  112  is arranged at the first middle line  1112  of the upper surface  1111  of the second pad  111 . The first middle line  1112  refers to a middle line, parallel to the side  41  where the ceramic tiles  4  are adjacent to each other, of the upper surface  1111  of the second pad  111  when the second ceramic tile leveling bracket  101  is placed at the junction of the adjacent ceramic tiles  4 . The longitudinal cross-section of the second ceramic tile leveling bracket  101  (i.e., the cross section parallel to the first middle line  1112 ) is approximately in an inverted T-shape (see  FIG.  15   ). It should be understood that the second insert  112  may not be disposed at the first middle line  1112  of the upper surface  1111  of the second pad  111 . For example, the second insert  112  is arranged at other positions, being parallel to or intersecting with the first middle line  1112 , on the upper surface  1111  of the second pad  111   
     When in use, the second pad  111  is disposed below the two adjacent ceramic tiles  4 , and the second insert  112  is inserted into the gap between the two adjacent ceramic tiles  4 . 
     The second pad  111  is in the shape of a flat plate, that is, the bottom face  1113  and the upper surface  1111  of the second pad  111  are flat surfaces parallel to each other. The side face, connecting the upper surface  1111  and the bottom face  1113 , of the second pad  111  is an inclined surface, and the inclined surface forms an acute angle with the bottom face  1113  of the second pad  111 . The two lateral sides  1114 , facing the ceramic tiles  4 , of the second pad  111  are respectively provided with at least one flow-through portion used to allow the adhesive below the ceramic tiles  4  to enter the space between the upper surface  111  of the second pad  111  and the lower surface of the ceramic tile  4  via the flow-through portion during the leveling of the ceramic tiles, such that the second pad  111  and the ceramic tile  4  are fixed as a whole during curing of the adhesive. Preferably, the two lateral sides  1114 , facing the ceramic tiles  4 , of the second pad  111  are respectively provided with two flow-through portions. In some implementations, the flow-through portion is a pad groove  1115  provided in the lateral side  1114  of the second pad  111 . The pad groove  1115  penetrates the second pad  111  in the thickness direction of the second pad  111 , that is, the pad groove  1115  penetrates from the bottom face  1113  of the second pad  111  to the upper surface  1111  of the second pad  111 , and the pad groove  1115  opens toward the ceramic tile  4 . In some implementations, a through-hole penetrating the bottom face  1113  and the upper surface  1111  of the second pad  111  may be used instead of the pad groove  1115 . 
     As shown in  FIG.  13   , the second insert  112  is used to receive the insertion block, and comprises at least one insertion block receiving portion  1120  which is used to receive the insertion block and into which the insertion block is inserted. Preferably, the insertion block receiving portion  1120  comprises a first insertion block receiving portion  116 , which is a insertion block through-hole provided in the second insert  112 , and/or second insertion block receiving portions  118  provided on at least one side of the second insert  112  in the lengthwise direction thereof. The second insert  112  comprises an extension end  115  away from the second pad  111 . The first connection piece  1121  and the second connection piece  1122  are connected to the extension end  115  and the second pad  111 , the first connection piece  1121  and the second connection piece  1122  are symmetrical about the center line  1123  of the second insert  112 , such that a first insertion block receiving portion  116  located in the middle of the second insert  112  is formed between the first connection piece  1121  and the second connection piece  1122 . The first insertion block receiving portion  116  penetrates the second insert  112  in the thickness direction of the second insert  112 . The first insertion block receiving portion  116  penetrates toward the second pad  111  and reaches the second pad, and can be used to receive insertion of the insertion block, that is, the lateral side, facing the second pad  111 , of the first insertion block receiving portion  116  is flush with the upper surface  1111  of the second pad  111 . The first insertion block receiving portion  116  may also be the same through-hole as the insertion block through-hole  16  in Embodiment 1, that is, the lateral side, facing the second pad  111 , of the second insertion block through-hole  116  is higher than the upper surface  1111  of the second pad  111 . 
     The second insert  112  further comprises a limiting portion  117 , and the limiting portion  117  is formed by two sides, in the lengthwise direction of the second insert  112 , of the extension end  115  extending toward the second pad  111  by a certain distance, such that two gaps are formed between the two limiting portions  117  and the corresponding first connection piece  1121  and second connection piece  1122  respectively as the second insertion block receiving portions  118 . The second insertion block receiving portions  118  can also be used to receive the insertion block. 
     Referring to  FIG.  14   , the upper edge  1161  of the first insertion block receiving portion  116  and the upper edge  1181  of the second insertion block receiving portion  118  are provided to be in the shape of an inclined surface, that is, the thickness of the upper edge  1161  of the first insertion block receiving portion  116  and the upper edge  1181  of the second insertion block receiving portion  118  gradually decreases toward the second pad  111 , such that the first insertion block receiving portion  116  and the second insertion block receiving portion  118  cooperates with the insertion block more smoothly. 
     It should be understood that, in some implementations, the insertion block receiving portion  1120  may only comprise a first insertion block receiving portion  116 ; in some implementations, the insertion block receiving portion  1120  may only comprise a second insertion block receiving portion  118 ; and in some implementations, the insertion block receiving portion  1120  may comprise a first insertion block receiving portion  116  and a second insertion block receiving portion  118 . 
     As shown in  FIGS.  15  and  16   , the second insert  112  is provided with a second connecting portion  113  close to the second pad  111 . The second connecting portion  113  detachably connects the second insert  112  and the second pad  111 . The second connecting portion  113  is arranged in the second insert  112  and is part of the second insert  112 , and is in the shape of a straight line with a certain width. The second connecting portion is adjacent to the second pad  111 , so that height of the second connecting portion  113  after breaking is substantially flush with the lower surface  42  of the ceramic tile  4 . The user can apply an external force to break the second connecting portion  113  along the straight line, so that the portion of the second insert  12  above the second connecting portion is separated from the second pad  111  from the position of breaking. The thickness of the second connecting portion  113  is less than the thickness of the second insert, such that a second linear groove  114  is formed on the second insert  112  and inwardly recessed from the second insert  112 . The second linear groove  114  may be located on at least one of the sides, facing the ceramic tile  4 , of the second insert  112 , for example, the second linear groove  114  is only located on one of the sides, facing the ceramic tile  4 , of the second insert  112 , and the other side, facing the ceramic tile  4 , of the second insert  112  is flat; or the second linear groove is located on both sides, facing the ceramic tile  4 , of the second insert  112  (see  FIG.  16   ). The bottom of the second linear groove  114  is the second connecting portion  113 . With the groove structure provided on one or both sides of the second connecting portion  113 , the second connecting portion  113  is relatively thin and has a thickness of generally about 1-2 mm. Such groove structure makes the second connecting portion  113  easy to tear. After the adhesive is cured, the user can violently break or tear the upper portion of the second insert  112  from the second connecting portion  113  with a conventional plier tool. 
     As shown in  FIG.  13   , the lower edge  1171 , facing the second pad  111 , of the limiting portion  117  of the second insert  112  is approximately parallel to the second pad  111 , and the user can remove the upper portion of the second insert  112  from the second connecting portion  113 , at the lower edge  1171  of the limiting portion  117 , with a pulling tool such as a small claw hammer. Specifically, the barbed structure of the pulling tool is used to engage into the lower edge  1171  of the limiting portion  117  to remove the portion, above the second connecting portion  113 , of the insert based on the lever principle. Also, the pulling device  35  provided on the pushing and clamping pliers  3  may be used to violently break or tear the upper portion of the second insert  112  from the second connecting portion  113 . 
     Referring to  FIGS.  17  and  18   , the longitudinal cross-section of the second insertion block  102  is wedge-shaped, and the second insertion block  102  has a third end  1021  and a fourth end  1022 . The height of the third end  1021  relative to the bottom face  121  of the second insertion block  102  is higher than the height of the fourth end  1022  relative to the bottom face  121  of the second insertion block  102 . The second insertion block  102  comprises at least one second serration portion  120 , with the longitudinal cross-section of the second serration portion  120  also being wedge-shaped. The longitudinal cross-section refers to the cross section perpendicular to the first middle line  1112  of the second pad  111  when the second insertion block  102  is inserted into the second insert  112 . The bottom face  121 , in contact with the ceramic tile  4 , of the second insertion block  102  is a flat surface. One second serration portion  120  comprises a serration portion top face  122 , and at least two serrations  123  provided on the serration portion top face  122 . The serration portion top face  122  is an inclined face relative to the bottom face  121  of the second insertion block  102 , and the included angle α 1  between the serration portion top face  122  and the bottom face  121  of the second insertion block  102  is an acute angle such that the serration portion top face  122  and the bottom face  121  of the second insertion block  102  extend to form an acute-angled end portion  125 , and the other end of the serration portion top face  122  extends away from the bottom face  121  of the second insertion block  102 , such that the second serration portion  120  is wedge-shaped as a whole. At least two serrations  123  are provided o the serration portion top face  122 , the multiple serrations  123  are arranged in a straight line along the serration portion top face  122 , and a serration slot  124  is formed between the adjacent serrations  123 . 
     The higher third end  1021  of the second insertion block  102  is provided with a base  126 , and the second serration portion  120  is disposed on the first side  1261 , facing the second insert  112 , of the base  126 . The second side  1262  of the base  126  opposite the first side  1261  thereof is provided with a second protrusion  1263 . The second protrusion  1263  is curved, i.e. the projection of the second protrusion  1263  on the bottom face  121  is an arc. The second protrusion  1263  is located in the middle of the second side  1262  of the base  126  and protrudes outward away from the base  126 , and the second protrusion  1263  can cooperate with the first groove  314  of the pushing and clamping pliers  3 . 
     Preferably, as shown in  FIG.  18   , the bottom of the second insertion block  102  can be arranged as a sunken structure, except that the bottom face  121  used for contact with the upper surface  42  of the ceramic tile  4  is a plat surface, the second serration portion  120 , the base  126  and the second protrusion  1263  are all sunken inward from the bottom face  121  to form a sunken structure. 
     As shown in  FIGS.  20  and  21   , when in use, the second ceramic tile leveling bracket  101  is fitted into the gap between the two adjacent ceramic tiles  4 , the end portion  125  of the second serration portion  120  of the second insertion block  102  is inserted into the insertion block receiving portion  1120  of the second insert  112 , and the user can push the second insertion block  102  as far as possible into the insertion block receiving portion  1120  by means of the pushing and clamping pliers  3 , such that the upper edge of the insertion block receiving portion  1120  can be engaged into the serration slot  124  so as to lock the positions of the two ceramic tiles  4 . Since the bottom face  121  of the second insertion block  102  is a flat surface, the upper surfaces of the two ceramic tiles  4  are necessarily in the same plane, such that the leveling process of the two ceramic tiles  4  can be completed. 
     In some implementations, as shown in  FIG.  17   , the second insertion block  102  comprises three second serration portions  120 , and the three serration portions  120  are disposed side by side at intervals, and the end portions  125  of the three second serration portions  120  together form the fourth end  1022  of the second insertion block  102 . When the second insert  112  is inserted into the second insertion block  102 , the second serration portions  120  on the two sides respectively cooperate with the second insertion block receiving portions  118  on the two sides of the second insert  112 ; and the second serration portion  120  in the middle cooperates with the first insertion block receiving portion  116 . The limiting portion  117  of the second insert  112  can limit the second insertion block  102  to sway from side to side during the movement so as to lock the positions of the two ceramic tiles  4 . 
     In some implementations, the second insertion block  102  comprises two second serration portions  120 , and the two serration portions  120  are arranged side by side at an interval and are respectively located on two ends of the first side  1261  of the base  126 . When the second insertion block  102  is inserted into the second insert  112 , the two second serration portions  120  respectively cooperate with the second insertion block receiving portions  118  on the two sides of the second insert  112 . The limiting portion  117  of the second insert  112  can limit the second insertion block  102  to sway from side to side during the movement so as to lock the positions of the two ceramic tiles  4 . 
     In some implementations, the second insertion block  102  comprises one second serration portion  120 , and the second serration portion  120  is located in the middle of the base  126 . When the second insertion block  102  is inserted into the second insert  112 , the second serration portion  120  in the middle of the base  126  cooperates with the first insertion block receiving portion  116  so as to lock the positions of the two ceramic tiles  4 . 
     In addition, the insertion block  2  in Embodiment 1 is also applicable to the second ceramic tile leveling bracket  101  in this embodiment. 
     The pushing and clamping pliers in this embodiment may be the same as the structure of the pushing and clamping pliers in Embodiment 1, which will not be repeated herein. 
     Embodiment 3 
       FIGS.  22 - 26    illustrate Embodiment 3 in the present application, which discloses a ceramic tile leveling system, comprising a third ceramic tile leveling bracket  201 . This embodiment is different from Embodiment 2 in that a first rib  219  is provided on the upper surface  2111 , facing the ceramic tile  4 , of the third pad  211  of the third ceramic tile leveling bracket  201 , and the first rib  219  is disposed at the upper surface of the third pad  211  and located on one side of the third insert  212 , and is formed by the upper surface  2111  of the third pad  211  protruding away from the third pad  211 . Other features of the third ceramic tile leveling bracket  201  are the same as those of the second ceramic tile leveling bracket  101  in Embodiment 2. The pushing and clamping pliers  3  used in the embodiment 2 can also be applied to the third ceramic tile leveling bracket  201  in the present embodiment. 
     As shown in  FIGS.  22  and  23   , the first rib  219  is an independent part separated from the third insert  212  and is not parallel to the third insert  212 , i.e. the first rib  219  can form an angle α 2  with the projection of the third insert  212  on the upper surface  2111  of the third pad  211 . In the present embodiment, the angle α 2  is 90 degree. 
     The first rib  219  is perpendicular to the third insert  212  and is located between the outer edge  2113  of the third pad  211  and the third insert  212 . Preferably, the first rib  219  is located at the second middle line  2112  of the upper surface  2111  of the third pad  211 , and the second middle line  2112  refers to a middle line, perpendicular to the third insert  212 , of the upper surface of the third pad  211 . It should be understood that, as shown, the first rib  219  can also be arranged at other positions parallel to the second middle line  2112 . The first end  2191  of the first rib  219  does not exceed the outer edge  2113  of the third pad  211 , and preferably, the first end  2191  of the first rib  219  stops at the outer edge  2113  of the third pad  211  and is flush with the outer edge  2113  of the third pad  211 . The third insert  212  has a first face  2121  facing to the first rib  219 , and a second face  2122  opposite the first face  2121 . The second end  2192  of the first rib does not exceed the second face  2122  of the third insert  212 , and preferably stops at the position where the third insert  212  is located on the third pad  211  and stops at the third insertion block through-hole  216 . 
     As shown in  FIG.  25   , the third insertion block  202  is also provided in this embodiment in order that the bottom face of the insertion block can be kept tangent to the upper surface of the ceramic tile  4  when the insertion block is inserted into the third insert  212  without being affected by the first rib  219 . The third insertion block  212  differs from the second insertion block  102  in embodiment 2 only in that a strip groove  2022  is provided in the bottom surface  2021  of the third insertion block  202 . When the third insertion block  202  is inserted into the third insert  212 , the strip groove  2022  can receive the first rib  219 , i.e. the first rib  219  can be inserted into the strip groove  2022 , so that the bottom surface  2021  of the third insertion block  202  can keep tangent to the upper surface of the ceramic tile  4 . It should be understood that the insertion block  2  in the embodiment 1 can also be used in the present embodiment by setting a strip groove on the serration portion bottom face  21  of the insertion block  2 . 
     When in use, as shown in  FIG.  24   , a third ceramic tile leveling bracket  201  is placed at the junction of any three adjacent ceramic tiles  4 , in which two ceramic tiles are located one side of the third insert  212  facing the first rib  219 , the two ceramic tiles are respectively located on the two sides of the first rib  219 , and the other ceramic tile is located on the side of the third insert  212  facing away from the first rib  219 . As shown in  FIG.  26   , then, the third insertion block  202  is inserted into the third insert  212 . The third insertion block  202  is pushed as far as possible into the third insert  212  by means of the pushing and clamping pliers  3 , such that the third insert  212  can be engaged into the serration slots so as to lock the positions of the three ceramic tiles  4 . Since the bottom face of the third insertion block  202  is a flat surface, the upper surfaces of the three ceramic tiles  4  are necessarily located on the same plane, such that the leveling process of the three ceramic tiles  4  can be completed. 
     Embodiment 4 
       FIGS.  27 - 30    illustrate Embodiment 4 in the present application, which discloses a ceramic tile leveling system, comprising fourth ceramic tile leveling bracket  301 , and which is different from Embodiment 3 in that the upper surface  3111  of the fourth pad  311  of the fourth ceramic tile leveling bracket  301  is provided with a second rib  319 , and the second rib  319  is perpendicular to the fourth insert  312 , and the second rib  319  is arranged on the two sides of the fourth insert  312 . The other technical features of the fourth ceramic tile leveling bracket  301  are the same as those of the third ceramic tile leveling bracket  201  in Embodiment 3. Preferably, the second rib  319  is located at the third middle line  3112  of the upper surface  3111  of the fourth pad  311 , and the third middle line  3112  refers to a middle line, perpendicular to the fourth insert  312 , of the upper surface  3111  of the fourth pad  311 . The first end  3191  of the second rib  319  does not exceed the first outer edge  3113  of the fourth pad  311 , and preferably stops at the first outer edge  3113  and is flush with the first outer edge  3113 ; and the second end  3192  of the second rib  319  does not exceed the second outer edge  3114 , opposite the first outer edge  3113 , of the fourth pad  311 , and preferably stops at the second outer edge  3114  and is flush with the second outer edge  3114 . 
     The structure of the fourth insertion block  302  used in the present embodiment is the same as the third insertion block  202  in the embodiment 3 and will not be repeated here. 
     when in use, a fourth ceramic tile leveling bracket  301  is placed at the junction of four adjacent ceramic tiles  4 , in which two ceramic tiles  4  are located on one side of the fourth insert  312  facing the first outer edge  3113 , the two ceramic tiles  4  are respectively located on two sides of the second rib  319 , and the other two ceramic tiles  4  are located on one side of the fourth insert  312  facing the second outer edge  3114  and are respectively located on the two sides of the second rib  319 . Then, the fourth insertion block  302  is inserted into the fourth insert  312 . The fourth insertion block  302  is pushed as far as possible into the fourth insert  312  by means of the pushing and clamping pliers  3 , such that the fourth insert  312  can be engaged into the serration slots so as to lock the positions of the four ceramic tiles  4 . Since the bottom face of the fourth insertion block  302  is a flat surface, the upper surfaces of the four ceramic tiles  4  are necessarily located on the same plane, such that the leveling process of the four ceramic tiles  4  can be completed. 
     Embodiment 5 
       FIGS.  31 - 33    illustrate Embodiment 5 of the application and disclose a ceramic tile leveling and laying system, comprising the fifth ceramic tile leveling bracket  401 , which differs from that in the embodiment 3 only that the third rib  419  is no longer perpendicular to the fifth insert  412 , but is at an acute angle to the fifth insert  412 . The third rib  419  is provided on the upper surface  4111  of the fifth pad  411  facing the ceramic tile  4 . The third rib  419  is formed by the upper surface  4111  of the fifth pad  411  protruding away from the fifth pad  411 . The third rib  419  is not perpendicular to the fifth insert  412 , but is at an acute angle to the projection of the fifth insert  412  on the upper surface  4111  of the fifth pad  411 . The other features of the fifth ceramic tile leveling bracket  401  is the same as the third ceramic tile leveling bracket  201  in the embodiment 3. The pushing and clamping pliers  3  used in the embodiment 2 can also be applied to the fifth ceramic tile leveling bracket  401  in the present embodiment. 
     the third rib  419  is an independent part separated from the fifth insert  412  and is not parallel to the fifth insert  412 , i.e. the third rib  419  can form an angle α 3  with the projection of the fifth insert  412  on the upper surface  4111  of the fifth pad  411 . In the present embodiment, the angle α 3  is less than 90 degree. 
     The structure of the insertion block used in the present embodiment is similar with the third insertion block  202  in the embodiment 3 except that a strip groove on the bottom of the insertion block is adapted to the third rib  419 , and will not be repeated here. When in use, as shown in  FIG.  33   , a fifth ceramic tile leveling bracket  401  is placed at the junction of three adjacent ceramic tiles  4 , in which the shape of the two ceramic tile  4  located at the third rib  419  are not rectangular or square, but parallelogram, and the two ceramic tiles  4  are located on the two sides of the third rib  419  respectively, and the other ceramic tile is located on the side of the fifth insert  412  away from the third rib  419 . Then, the insertion block is inserted into the fifth insert  412 . The insertion block is pushed as far as possible into the fifth insert  412  by means of the pushing and clamping pliers  3 , such that the fifth insert  412  can be engaged into the serration slots so as to lock the positions of the three ceramic tiles  4 . Since the bottom face of the insertion block is a flat surface, the upper surfaces of the three ceramic tiles  4  are necessarily located on the same plane, such that the leveling process of the three ceramic tiles  4  can be completed. 
     Embodiment 6 
       FIGS.  34 - 36    illustrate Embodiment 6 of the application and disclose a ceramic tile leveling and laying system, comprising the sixth ceramic tile leveling bracket  601 , which differs from that in the embodiment 4 only that only part of the fourth rib  519  is perpendicular to the sixth insert  612 , and the other part is at an acute angle to the sixth insert  612 . As shown in  FIGS.  34  and  35   , the fourth rib  519  is provided on the upper surface  6111  of the sixth pad  611  facing the ceramic tile  4 . The fourth rib  519  is formed by the upper surface  6111  of the sixth pad  611  protruding away from the sixth pad  611 . The fourth rib  519  is divided into two portions, the first portion  5191  being located on one side of the sixth insert  612 , which forms an acute angle α 4  with the projection of the sixth insert  612  on the upper surface  6111 , and the second portion  5192  is perpendicular to the sixth insert  612  to form a right angle α 5 . The other features of the sixth ceramic tile leveling bracket  601  is the same as the fourth ceramic tile leveling bracket  301  in the embodiment 4. The pushing and clamping pliers  3  used in the embodiment 2 can also be applied to the sixth ceramic tile leveling bracket  601  in the present embodiment. 
     The structure of the insertion block used in the present embodiment is the same as the third insertion block  202  in the embodiment 3 and will not be repeated here. 
     When in use, as shown, a sixth ceramic tile leveling bracket  601  is placed at the junction of four adjacent ceramic tiles  4 , in which the shape of the two ceramic tile  4  located at the two sides of the first portion  5191  of the fourth rib  519  are not rectangular or square, but parallelogram, and the two other ceramic tiles located at the two sides of the second portion  5192  of the fourth rib  519  are rectangle or square. Then, the insertion block is inserted into the sixth insert  612 . The insertion block is pushed as far as possible into the sixth insert  612  by means of the pushing and clamping pliers  3 , such that the sixth insert  612  can be engaged into the serration slots so as to lock the positions of the four ceramic tiles  4 . Since the bottom face of the insertion block is a flat surface, the upper surfaces of the four ceramic tiles  4  are necessarily located on the same plane, such that the leveling process of the four ceramic tiles  4  can be completed. 
     It should be understood that the second portion  5192  of the fourth rib  519  can also be arranged at an acute angle to the sixth insert  612  for using in the leveling process of four parallelogram ceramic tiles  4 . 
     Embodiment 7 
       FIGS.  37 - 46    illustrate Embodiment 7 in the present application. As shown in  FIG.  37   , this embodiment discloses second pushing and clamping pliers  500  for the ceramic tile leveling system, the second pushing and clamping pliers comprising a third component  501 , a fourth component  502 , and a third pivot  503 . The third component  501  comprises a third clamping portion  5011  and a third handheld portion  5012 , and the fourth component  502  comprises a fourth clamping portion  5021  and a fourth handheld portion  5022 , wherein the fourth clamping portion  5021  is rotatably connected to the third clamping portion  5011  via the third pivot  503 . The third clamping portion  5011  is provided with a third clamping block  5013  at the top end away from the third handheld portion  5012 , the fourth clamping portion  5021  is provided with a fourth clamping block  5023  at the top end away from the fourth handheld portion  5022 , the third clamping block  5013  is disposed opposite the fourth clamping block  5023 , and the third clamping block  5013  and the fourth clamping block  5023  are approximately in the same plane. The third clamping portion  5011  extends and bends in a first direction X from the third handheld portion  5012 , and forms an obtuse angle with the third handheld portion  5012 , with the angle being θ 1 , 155°≤θ 1 ≤160°. The fourth clamping portion  5021  extends and bends in a second direction Y from the fourth handheld portion  5022 , and forms an obtuse angle with the fourth handheld portion  5022 , with the angle being θ 2 , 155°≤θ 2 ≤160°. The fourth clamping portion  5021  bends toward the same side as the third clamping portion  5011 , i.e. the first direction X and the second direction Y are located in the same side of the third handheld portion  5012  and the fourth handheld portion  5022 . 
     The second pushing and clamping pliers  500  can cooperate with the ceramic tile leveling bracket and the insertion block in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5 and Embodiment 6 to apply a pushing and clamping force so as to lock the positions of the ceramic tiles  4 , thereby completing the leveling process of the ceramic tile  4 . Compared with the pushing and clamping pliers  3  in the embodiments described above, the second pushing and clamping pliers  500  is more convenient to operate: when the pushing and clamping pliers  3  in the embodiments described above are used, since the handheld portion of the pushing and clamping pliers  3  vertically faces upward, the user needs to turn his hand over to operate, thereby consuming more physical strength and being easily fatigue. However, in this embodiment, the clamping portion is bent, such that when the second pushing and clamping pliers  500  is used, the handheld portion is substantially in a horizontal position, such that the user can operate without turning the hand, which is conducive to saving physical strength. 
     As shown in  FIG.  38   , the inner side faces opposite each other of the third clamping block  5013  and the fourth clamping block  5023  may be provided with second clamping teeth  504 . The second clamping teeth  504  is arranged on the side face, facing the fourth clamping block  5023 , of the third clamping block  5013 , that is, the second clamping teeth  504  of the third clamping block  5013  is disposed opposite the fourth clamping block  5023 . The second clamping teeth  504  may also be disposed on the side face, facing the third clamping block  5013 , of the fourth clamping block  5023 , that is, the second clamping teeth  504  of the fourth clamping block  5023  is disposed opposite the third clamping block  5013 . In other words, the second clamping teeth  504  of the third clamping block  5013  are disposed opposite the second clamping teeth  504  of the fourth clamping block  5023 , the inner side faces opposite each other of the two clamping blocks are clamping faces opposite each other, and the second clamping teeth  504  can increase the coefficient of friction between the clamping faces and the surface of the clamped object, thereby preventing the clamped object from slipping out. 
     As shown in  FIG.  38   , the inner side wall of the clamping face of the third clamping block  5013  is provided with an inwardly recessed second third groove  5014 , with the direction of opening thereof facing the fourth clamping portion  5021 ; and the fourth clamping block  5023  is provided with a fourth groove  5024  that penetrates the fourth clamping block  5023  toward the third clamping block  5013 , and the fourth groove  5024  and the third groove  5014  are disposed opposite each other and in the same straight line. Portions, on the two sides and at the bottom of the clamping through-groove, of the fourth clamping block  5023  form a bifurcated structure comprising two bifurcated portions, the fourth groove  5024  is located between the two bifurcated portions, and the second clamping teeth  504  of the fourth clamping portion  5021  are provided on the clamping faces on the inner sides of the two bifurcated portions. The fourth groove  5024  and the third groove  5014  are configured to match with the insertion block such that the insertion block is pushed and clamped into the ceramic tile leveling bracket so as to achieve leveling of the ceramic tiles  4 , wherein the insertion block and the ceramic tile leveling bracket may be the insertion block and the ceramic tile leveling bracket in any one of Embodiments 1-6. Here, the second insertion block  102  and the second ceramic tile leveling bracket  101  in Embodiment 2 are described as an example. As shown in  FIG.  44   , when in use, the third groove  5014  cooperates with the second protrusion  1263  of the second insertion block  102 , and is located on one side of the second insert  112  of the second ceramic tile leveling bracket  101 ; and the fourth groove  5024  is located on the other opposite side of the second insert  112 , and the end portion  125  of the serration portion  120  is enabled to slide in the fourth groove  5024  such that the second insertion block  102  is secured in the insertion block receiving portion  1120  so as to lock the positions of the ceramic tiles  4 . 
     As shown in  FIGS.  37  and  39   , the second pushing and clamping pliers  500  further comprises a second elastic member  505 , with one end thereof being connected to the third clamping portion  5011 , and the other end thereof being connected to the fourth clamping portion  5021 ; or with one end thereof being connected to the third handheld portion  5012 , and the other end thereof being connected to the third handheld portion  5012 . When the third component  501  and the fourth component  502  of the second pushing and clamping pliers  500  are to be relatively closed, the user only needs to use one hand to apply force to the inner side, but when they are to be relatively opened, the user needs to use two hands at the same time, so the operation is inconvenient. With the second elastic member  505  mounted between the third component  501  and the fourth component  502 , and a certain outward tension can be provided between the third component  501  and the fourth component  502 , which causes the third component  501  and the fourth component  502  to move in the opening direction, such that the user can perform opening and closing operations with one hand. The second pushing and clamping pliers  500  further comprises a third guiding post  5051  and a fourth guiding post  5052  respectively disposed at two opposite side faces of the two handheld portions. The third guiding post  5051  protrudes from the inner side face of the third handheld portion  5012 ; and the fourth guiding post  5052  protrudes from the inner side face of the fourth handheld portion  5022 , and the fourth guiding post  5052  is disposed opposite the third guiding post  5051 . The second elastic member  505  is a coil spring, with one end thereof being sheathed over the third guiding post  5051 , and the other end thereof being sheathed over the fourth guiding post  5052 . In other variant embodiments, the two guiding posts may be respectively disposed on two opposite side faces of the two clamping portions. The third guiding post  5051  protrudes from the inner side face of the third clamping portion  5011 , the fourth guiding post  5052  protrudes from the inner side face of the fourth clamping portion  5021 , and the third guiding post  5051  is disposed opposite the fourth guiding post  5052 . 
     As shown in  FIG.  37   , the second pushing and clamping pliers  500  further comprise a second locking device  506  used to switch the second pushing and clamping pliers  500  between opened and closed states including a closed state and an opened state. When the second locking device  506  is locked, the elastic force of the second elastic member  505  is overcome so that the second pushing and clamping pliers  500  are in the closed state. When the second locking device  506  is unlocked, the second pushing and clamping pliers  500  are in the opened state under the action of the elastic force of the second elastic member  505 . 
     As shown in  FIG.  39   , the second pushing and clamping pliers  500  further comprise a third bent portion  5015  and a fourth bent portion  5025 , which are both sheathed outside the third pivot  503 , such that the fourth component  502  is hinged to the third component  501  via the third pivot  503 . The third bent portion  5015  is part of the third clamping portion  5011 , and the fourth bent portion  5025  is part of the fourth clamping portion  5021 . The second locking device  506  comprises a second locking slot  5061 , a second locking member  5062 , and a second blocking block  507  (see  FIG.  43   ). The second locking member  5062  is disposed at the ends of the two clamping portions and close to the handheld portion. The second locking slot  5061  is disposed one of the third clamping portion  5011  and the fourth clamping portion  5021 , and the second locking slot  5061  is located on the outer side wall of the bent portion of the clamping portion where the second locking slot is located. The second locking member  5062  is rotatably connected to the other of the third clamping portion  5011  and the fourth clamping portion  5021  and is disposed opposite the second locking slot  5061 . The second blocking block  507  is disposed on the same clamping portion as the second locking slot  5061 , and is disposed opposite the bent portion of the other clamping portion. Here, description is made in detail taking an example in which the second locking slot  5061  is disposed on the third bent portion  5015  of the third clamping portion  5011 , the second locking member  5062  is connected to the fourth clamping portion  5021 , and the second blocking block  507  is disposed on the third clamping portion  5011 . 
     As shown in  FIG.  39   , the second locking slot  5061  is disposed at the outer side wall of the third bent portion  5015 , the second locking member  5062  is rotatably fitted to the fourth clamping portion  5021 , preferably at the surface of the end of the fourth clamping portion  5021 , and the second locking member  5062  is disposed opposite the second locking slot  5061 . As shown in  FIGS.  40 ,  41  and  42   , the second locking member  5062  comprises a second locking member body  50621 , a second locking engagement block  50622 , a limiting block  50623 , and a toggle portion  50624 . The second locking member body  50621  is rotatably connected to the end of the fourth clamping portion  5021  via the fourth pivot  50625 . The second locking engagement block  50622  has an obtuse angle and is located at the surface of the second locking member body  50621 . The limiting block  50623  is formed by the surface of the second locking member body  50621  protruding outward, with the side wall thereof being bent, with one bent side wall abutting against the side wall of the end of the third clamping portion  5011 . The toggle portion  50624  is used to move the second locking member body  50621  and is disposed at the surface of the second locking member body  50621 , and the side wall of the toggle portion  50624  is inwardly recessed from the surface of the second locking member body  50621  so as to form convex corners at two ends of the side wall of the toggle portion  50624  to facilitate moving the second locking member  5062 . A toothed pattern  50626  is provided in the side wall of the toggle portion  50624  so as to increase the friction when the second locking member  5062  is moved. The toggle portion  50624  can be moved with a finger to drive the second locking member body  50621  to rotate such that the second locking engagement block  50622  is engaged into or disengaged from the second locking slot  5061 . The second locking device  506  further comprises a second blocking block  507 , which is disposed at the surface of the third clamping portion  5011  and is disposed opposite the fourth bent portion  5025 . When the second pushing and clamping pliers  500  has the maximum opening angle, the second blocking block  507  comes into contact with the fourth bent portion  5025  so as to block the fourth bent portion  5025 . 
     When the second pushing and clamping pliers  500  need to be adjusted from the closed state to the opened state, the two handheld portions can be first closed, and then the toggle portion  50624  is rotated counterclockwise, such that the second locking engagement block  50622  is disengaged from the second locking slot  5061  and is therefore unlocked, and the two clamping portions are opened under the action of the second elastic member  505  (coil spring). When the second pushing and clamping pliers  500  need to be adjusted from the opened state to the closed state, the two handheld portions can be first closed, and then the toggle portion  50624  is rotated clockwise, such that the second locking engagement block  50622  is engaged into the second locking slot  5061 , and the two clamping portions are therefore locked in the closed state. 
     It should be understood that the second locking slot  5061  may also be disposed at the outer side wall of the fourth bent portion  5025 , and the second locking member  5062  is rotatably connected to the end of the third clamping portion  5011  and is disposed opposite the second locking slot  5061 . The second blocking block  507  is disposed at the fourth clamping portion  5021 , preferably at the surface of the end of the fourth clamping portion  5021 , and is disposed opposite the third bent portion  5015 . 
     The pulling device  35  of the pushing and clamping pliers  3  in Embodiment 1 may also be applied to this embodiment. As shown in  FIG.  45   , the second pushing and clamping pliers  500  further comprises a second pulling device  508 , which comprises a second hooked corner portion  5081  and a second rounded corner portion  5082 . The second hooked corner portion  5081  is disposed on one of the third clamping block  5013  and the fourth clamping block  5023 , and the second rounded corner portion  5082  is disposed on the other of the third clamping block  5013  and the fourth clamping block  5023 . Here, description is made taking an example in which the second hooked corner portion  5081  is disposed at the third clamping block  5081 , and the second rounded corner portion  5082  is disposed at the fourth clamping block  5023 . The second hooked corner portion  5081  protrudes in a barbed shape from the outer side wall  50131  of the third clamping block  5013 , and the outer edge of the second hooked corner portion  5081  is a smooth flat surface or an arc-shaped curved surface, and is disposed at the junction of the side wall  50131  and the top  50132  of the third clamping block  5013 . The second rounded corner portion  5082  is disposed at the junction of the side wall  50231  and the top  50232  of the fourth clamping block  5023 , and each of the two bifurcated portions has a second rounded corner portion  5082 . It should be understood that the second hooked corner portion  5081  is in a barbed shape and can protrude from the outer side wall  50231  of the fourth clamping block  5023 , and the two bifurcated portions protrude outwardly and extend to form a second hooked corner portion  5081 , and the second hooked corner portion  5081  has an outer edge that is a smooth flat surface or an arc-shaped curved surface, and is disposed at the junction of the side wall  50231  and the top  50232  of the fourth clamping block  5023 . The second rounded corner portion  5082  can be disposed at the junction of the side wall  50131  and the top  50132  of the third clamping block  5013 . 
     In the ceramic tile laying process, after the adhesive is cured, the ceramic tile leveling bracket and the ceramic tiles are all fixed by the adhesive, and the second pulling device  508  of the second pushing and clamping pliers  500  can be used to remove the upper half of the ceramic tile leveling bracket, wherein the ceramic tile leveling bracket may be the ceramic tile leveling bracket of any one of Embodiments 1-4. Here, the second ceramic tile leveling bracket  101  in Embodiment 2 is described as an example. As shown in  FIG.  46   , by means of the second hooked corner portion  5081  abutting against the lower edge of the limiting portion  117  of the second ceramic tile leveling bracket  101 , and taking the second rounded corner portion  5082  as a fulcrum, the second insert  112  is broken from the second connecting portion  113  to remove the portion of the second insert  112  above the second connecting portion  113 . 
     Embodiment 8 
     As shown in  FIGS.  47 - 50   , this embodiment discloses a third pushing and clamping pliers  600  for the ceramic tile leveling system, which is merely different from the second pushing and clamping pliers  500  in Embodiment 7 in that the locking devices are different. In this embodiment, the locking device  37  used by the pushing and clamping pliers  3  in Embodiment 1 is used instead of the second locking device  506  in Embodiment 7. 
     As shown in  FIGS.  47  and  50   , the third pushing and clamping pliers  600  comprise a third locking device  606 . The third locking device  606  comprises a third locking slot  6061 , a third locking member  6062 , and a third blocking block  607 . The third locking slot  6061  is disposed on one of the two clamping portions and is located at the outer side wall of the bent portion of the clamping portion. The third locking member  6062  is rotatably connected to the other of the two clamping portions and is disposed opposite the third locking slot  6061 . The third blocking block  607  is disposed on the same clamping portion as the third locking slot  6061 , and is disposed opposite the bent portion of the other clamping portion. 
     As shown in  FIGS.  48  and  49   , the third locking member  6062  comprises a third locking member body  60621 , a third locking engagement block  60622 , and a second tab  60623 . The third locking member body  60621  may be a metal sheet, and is rotatably connected to the end of one of the two clamping portions via the fifth pivot  60625 . A second gasket  60626  is provided between the third locking member  6062  and the clamping portion connected thereto, the third locking member  6062  and the clamping portion are both made of metal, and the second gasket  60626  can assist in the relative rotation of the two, thereby reducing wear between the components. The third locking engagement block  60622  protrudes from the surface of the third locking member body  60621  and is located at one end, facing the third locking slot  6061 , of the third locking member body  60621 . When the third locking engagement block  60622  is engaged into the third locking slot  6061 , the third locking device  607  is locked. When the third locking engagement block  60622  is disengaged from the third locking slot  6061 , the third locking device  607  is unlocked. The second tab  60623  protrudes form the surface of the third locking member body  60621  and is preferably perpendicular to the surface of the third locking member body  60621 , and the user can move the second tab  60623  with a finger to drive the third locking member body  60621  to rotate, such that third locking engagement block  60622  is engaged into or disengaged from the third locking slot  6061 . 
     The above description is only preferred embodiments of the present application, and a person of ordinary skill in the art can also make some improvements and refinements to the above technical solutions without departing from the principles of the present application, and these improvements and refinements should also be considered to be within the scope of protection of the present application.