Patent Publication Number: US-2023157469-A1

Title: Hook assembly and shelving assembly using the same

Description:
FIELD OF THE INVENTION 
     The present application relates to a connecting mechanism, in particular to a hook assembly and a shelving assembly using the hook assembly. 
     DESCRIPTION OF THE PRIOR ART 
     Shelves are commonly used equipment in daily life. Household shelves are usually used to place clothes, daily necessities, etc., and commercial shelves are usually used to place commodities and products. Among them, shelves installed on vertical surfaces are widely used in supermarkets and shopping malls because of their small footprints. A shelf of this kind usually has a plurality of brackets fixedly installed on a vertical wall surface or a board surface, and then a rack is placed horizontally on the brackets to form a shelf. The rack has a grid-like structure, which is composed of a plurality of transverse metal wires provided in parallel and a plurality of longitudinal metal wires provided in parallel interwoven. 
     In a shelving system, a hook assembly is one of the commonly used shelving assemblies. The hook assembly usually comprises an upper connecting mechanism and a lower hook, wherein the connecting mechanism is used to connect the hook assembly to a rack or a bracket, and the hook is used to hang clothes or a rail. In some prior art, the hook assembly comprises an elongated top, and the top comprises a front hook portion and a rear hook portion. The width of the elongated top is less than the gap between longitudinal metal wires provided in parallel, and the length of the top is equal to the gap between transverse metal wires provided in parallel. When installing, after tilting the top by a certain angle, and passing it through the gap between the longitudinal metal wires from bottom to top, lay the top flat. The front hook portion and the rear hook portion respectively hook a transverse metal wire, so that the hook assembly is fixedly connected to the rack. 
     With the increase in demand, it is desirable that the shelving system can carry more goods, as well as heavier weight. One of the conventional methods to solve this problem is to use a densely gridded rack. That is, the spacing between adjacent longitudinal metal wires of the rack is reduced. In this case, because the width of the top of the hook assembly in the prior art is larger than the spacing between adjacent longitudinal metal wires, the hook assembly is interfered by the longitudinal metal wires and cannot enter the gap between the longitudinal metal wires. If the width of the top is reduced in order for the hook assembly to enter the gap between the longitudinal metal wires, the strength of the top will be reduced, such that the load-bearing capacity of the hook assembly will be reduced. 
     Therefore, those skilled in the art devote themselves to developing a hook assembly and a shelving assembly using the hook assembly. In a shelving system that uses a densely gridded rack, the hook assembly can be reliably connected to the densely gridded racks without affecting the load-bearing capacity of the shelving assembly. 
     SUMMARY OF THE INVENTION 
     In order to solve the above technical problems, the present application provides a hook assembly, comprising a hook portion and a connecting portion, wherein a first end of the hook portion is fixedly connected to the connecting portion, and the connecting portion is configured to be detachably connected to a rack. 
     In some embodiments, optionally, the width of the connecting portion is greater than the spacing between adjacent longitudinal metal wires of the rack. 
     In some embodiments, optionally, the connecting portion is provided with a receiving groove, the receiving groove crosses a first surface of the connecting portion along the length direction of the connecting portion, and the receiving groove is configured to receive the longitudinal metal wire of the rack. 
     In some embodiments, optionally, the size of the receiving groove matches the diameter of the longitudinal metal wire. 
     In some embodiments, optionally, there are a plurality of the receiving grooves and their sizes match the longitudinal metal wire, and the spacing between adjacent receiving grooves is equal to the spacing between adjacent longitudinal metal wires. 
     In some embodiments, optionally, the width of the receiving groove is greater than twice the diameter of the longitudinal metal wire. 
     In some embodiments, optionally, the receiving groove extends along a front hook portion of the connecting portion, dividing the front hook portion into two parts. 
     In some embodiments, optionally, the receiving groove extends along a rear hook portion of the connecting portion, dividing the rear hook portion into two parts. 
     Another object of the present application is to provide a hook assembly, comprising a connecting portion and a hook portion, wherein the connecting portion is fixedly connected to a first end of the hook portion, and the connecting portion is configured to be provided at a joint between a first rack and a second rack provided adjacently. 
     In some embodiments, optionally, the connecting portion is provided with a receiving groove, the receiving groove is provided along the length direction of the connecting portion and crosses a first surface of the connecting portion, and the receiving groove is configured to receive a first longitudinal metal wire, which is adjacent to the second rack, on the first rack, and a second longitudinal metal wire, which is adjacent to the first rack, on the second rack. 
     In some embodiments, optionally, the depth of the receiving groove matches the diameters of the first longitudinal metal wire and the second longitudinal metal wire. 
     In some embodiments, optionally, the width of the receiving groove is greater than the sum of the diameter of the first longitudinal metal wire and the diameter of the second longitudinal metal wire. 
     Another object of the present application is to provide a shelving assembly, comprising a rack and a hook assembly, wherein the hook assembly is connected to the rack; 
     the hook assembly comprises a hook portion and a connecting portion, one end of the hook portion is fixedly connected to the connecting portion, a first surface of the connecting portion is provided with a receiving groove along the length direction of the connecting portion, and the receiving groove is used to receive a longitudinal metal wire of the rack; and 
     the connecting portion further comprises a front hook portion and a rear hook portion respectively provided at two ends of the connecting portion in its length direction, and the front hook portion and the rear hook portion are respectively connected to transverse metal wires provided adjacently on the rack. 
     Another object of the present application is to provide a shelving assembly which comprises: 
     at least two racks, wherein the at least two racks are provided adjacently; and 
     a hook assembly which is connected to a joint between two adjacent racks; 
     wherein the hook assembly comprises a hook portion and a connecting portion, one end of the hook portion is fixedly connected to the connecting portion, a first surface of the connecting portion is provided with a receiving groove along the length direction of the connecting portion, and adjacent longitudinal metal wires on the two adjacent racks are located in the receiving groove; and 
     the connecting portion further comprises a front hook portion and a rear hook portion respectively provided at two ends of the connecting portion in its length direction, and the front hook portion and the rear hook portion are configured to be detachably connected to transverse metal wires of the two adjacent racks, respectively. 
     Another object of the present application is to provide a shelving assembly, comprising a rack, a hook assembly and a hanging rod, wherein the hook assembly is connected to the rack, and the hanging rod is connected to the hook assembly; 
     the hook assembly comprises a hook portion and a connecting portion, one end of the hook portion is fixedly connected to the connecting portion, a first surface of the connecting portion is provided with a receiving groove along the length direction of the connecting portion, and the receiving groove is used to receive a longitudinal metal wire of the rack; 
     the connecting portion further comprises a front hook portion and a rear hook portion respectively provided at two ends of the connecting portion in its length direction, and the front hook portion and the rear hook portion are respectively connected to transverse metal wires provided adjacently on the rack; and 
     the hook portion further comprises a lower hook portion provided at a second end thereof, and the lower hook portion is configured to carry the hanging rod. 
     Another object of the present application is to provide a shelving assembly which comprises: 
     at least two racks, wherein the at least two racks are provided adjacently; and 
     a hook assembly which is connected to a joint between two adjacent racks; 
     a hanging rod which is connected to the hook assembly; 
     wherein the hook assembly comprises a hook portion and a connecting portion, one end of the hook portion is fixedly connected to the connecting portion, a first surface of the connecting portion is provided with a receiving groove along the length direction of the connecting portion, and adjacent longitudinal metal wires on the two adjacent racks are located in the receiving groove; and 
     the connecting portion further comprises a front hook portion and a rear hook portion respectively provided at two ends of the connecting portion in its length direction, and the front hook portion and the rear hook portion are configured to be detachably connected to transverse metal wires of the two adjacent racks, respectively; and the hook portion further comprises a lower hook portion provided at a second end thereof, and the lower hook portion is configured to receive the hanging rod. 
     Another object of the present application is to provide a shelving system which comprises: 
     a horizontal beam which is fixedly connected to a vertical surface; 
     a vertical beam which is slidably connected to the horizontal beam; 
     a bracket which is detachably connected to the vertical beam; 
     a rack which is provided on the bracket, is in contact with the bracket, and comprises a longitudinal metal wire; 
     a hook assembly which is connected to the rack; and 
     a hanging rod which is connected to the hook assembly; 
     wherein the hook assembly comprises a connecting portion, the hook assembly is connected to the rack through the connecting portion, and the width of the connecting portion is larger than the spacing between adjacent longitudinal metal wires. 
     Another object of the present application is to provide a shelving system which comprises: 
     a horizontal beam which is fixedly connected to a vertical surface; 
     a vertical beam which is slidably connected to the horizontal beam; 
     a bracket which is detachably connected to the vertical beam; 
     at least two racks which are provided on the bracket, are in contact with the bracket, and comprise longitudinal metal wires, wherein the at least two racks are provided adjacently; 
     a hook assembly which is connected to a joint between the two adjacent racks; and 
     a hanging rod which is connected to the hook assembly; 
     wherein the hook assembly comprises a connecting portion, and the hook assembly is respectively connected to the two adjacent racks through the connecting portion. 
     Another object of the present application is to provide a shelving system which comprises: 
     a bracket which is fixedly connected to a vertical surface; 
     a rack which is provided on the bracket, is in contact with the bracket, and comprises 
     a longitudinal metal wire; 
     a hook assembly which is connected to the rack; and 
     a hanging rod which is connected to the hook assembly; 
     wherein the hook assembly comprises a connecting portion, the hook assembly is connected to the rack through the connecting portion, and the width of the connecting portion is larger than the spacing between adjacent longitudinal metal wires. 
     Another object of the present application is to provide a shelving system which comprises: 
     a bracket which is fixedly connected to a vertical surface; 
     at least two racks which are provided on the bracket, are in contact with the bracket, and comprise longitudinal metal wires, wherein the at least two racks are provided adjacently; 
     a hook assembly which is connected to a joint between the two adjacent racks; and 
     a hanging rod which is connected to the hook assembly; 
     wherein the hook assembly comprises a connecting portion, and the hook assembly is respectively connected to the two adjacent racks through the connecting portion. 
     Compared with the prior art, a hook assembly provided in the present application has at least the following technical advantages: 
     1. The hook assembly provided in the present application can be reliably connected to a densely gridded rack without reducing the width of a top plate, so as to avoid the interference from the longitudinal metal wires. Most of the sizes of the hook assembly remain unchanged, so as to solve the technical problems existing in the prior art with minimal modification and cost. 
     2. Compared with the prior art, with regard to the hook assembly provided in the present application, not only does it not need to reduce the width of the top plate, but it can also increase the width of the top when the top plate is provided with a plurality of receiving grooves, further increasing the load-bearing capacity of the hook assembly. 
     3. The hook assembly provided in the present application can be used as a connecting piece between two racks to increase the stability of the racks, thereby further improving the overall load-bearing capacity of the shelving system. 
     Hereinafter, the concept, specific structure and technical effects of the present application will be further illustrated in conjunction with the accompanying drawings, so as to fully understand the purposes, features and effects of the present application. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic view of the definition of directions and sizes of the present application; 
         FIG.  2    is a schematic view of the overall structure of an embodiment of the present application; 
         FIG.  3    is a partial enlarged schematic view of an embodiment of the present application; 
         FIG.  4    is a partial enlarged schematic view of an embodiment of the present application; 
         FIG.  5    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; 
         FIG.  6    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; 
         FIG.  7    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; 
         FIG.  8    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; 
         FIG.  9    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; 
         FIG.  10    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; 
         FIG.  11    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application; and 
         FIG.  12    is a schematic view of a connection relationship in a shelving assembly of an embodiment of the present application. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, a plurality of preferred embodiments of the present application will be introduced with reference to the drawings attached to the specification, so that the technical content will be clearer and easier to understand. The present application can be embodied in many different forms of embodiments, and the scope of protection of the present application is not limited to the embodiments mentioned herein. 
     In the drawings, components with the same structure are represented by the same numerals, and components with similar structures or functions are represented by similar numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the size and thickness of each component are not limited in the present application. In order to make the illustration clearer, the thicknesses of the components are appropriately exaggerated in some places in the drawings. The hook assembly provided in the present application is a part of the shelving assembly. Specifically, it is a hook assembly used in conjunction with a rack. As shown in  FIG.  1   , in the present application, “vertical directions” are same as or opposite to a natural gravity direction, that is, an arrow A points to a “vertical direction” downwards, and an arrow B points to a “vertical direction” upwards. “Horizontal directions” are natural horizontal directions, that is, directions indicated by arrows C, D, E, and F are all the “horizontal directions”. In the horizontal directions, the directions pointed by the arrows E and F are “transverse directions”, and the directions pointed by the arrows C and D are “longitudinal directions”, wherein the direction pointed by the arrow C is toward a “front end”, and the direction pointed by the arrow D is toward a “rear end”. In the shelving assembly, the rack is composed of a plurality of metal wires provided in parallel along different directions interwoven. The metal wires provided along the transverse directions are “transverse metal wires”, and the metal wires provided along the longitudinal directions are “longitudinal metal wires”. The connecting portion of the hook assembly is substantially rectangular, wherein the size along the transverse direction is the “width”, as shown in  FIG.  1   , a is the width a of the connecting portion; the size along the longitudinal direction is the “length”, as shown in  FIG.  1   , b is the length b of the connecting portion; and as shown in  FIG.  1   , d is the spacing between adjacent longitudinal metal wires. 
     Embodiment 1 
     The structure view of this embodiment is shown in  FIGS.  2 - 5   . In this embodiment, there is provided a hook assembly comprising a connecting portion  101  and a hook portion  102 . The connecting portion  101  is fixedly connected to the hook portion  102 , and a first end  22  of the hook portion  102  is connected to the connecting portion  101 . In this embodiment, in a normal use state, the connecting portion  101  is above the hook portion  102 . The connecting portion  101  is an elongated rectangle, comprising a front hook portion  11 , a rear hook portion  12  and a receiving groove  13 . The front hook portion  11  and the rear hook portion  12  are respectively located at two ends of the connecting portion  101  along the length direction. Preferably, the front hook portion  11  is located at a front end of the connecting portion  101 , and the rear hook portion  12  is located at a rear end of the connecting portion  101 . The connecting portion  101  has a first surface  14 , that is, the upper surface of the connecting portion  101 . The first surface  14  is substantially a flat surface. The receiving groove  13  is a recessed groove provided on the first surface  14  of the connecting portion  101  along the length direction of the connecting portion  101 . The receiving groove  13  crosses the first surface  14  along the length direction of the connecting portion  101 . The hook portion  102  is curved and is “J” shaped as a whole. A first end  22  of the “J” shaped hook portion  102  is connected to the connecting portion  101 , and a lower hook portion  21  is provided at a second end  23  of the “J” shaped hook portion  102 . 
     As shown in  FIG.  2   , the front and rear sides of the second end  23  of the “J” shaped hook portion  102  each extend a certain distance to form the lower hook portion  21 . The lower hook portion  21  is used to receive a hanging rod of a shelving assembly. The lower hook portion  21  has a lower hook portion opening, and preferably, the orientation of the lower hook portion opening is opposite to the orientation of the front hook portion  11 , that is, upwards along the vertical direction as shown in the figure. 
     As shown in  FIG.  3   , the receiving groove  13  extends from the first surface  14  along the front hook portion  11 , dividing the front hook portion  11  into two parts. 
     As shown in  FIG.  4   , the receiving groove  13  extends from the first surface  14  along the rear hook portion  12 , dividing the front hook portion  12  into two parts. 
     The connection relationship between the shelving system and other components in the shelf in this embodiment is shown in  FIG.  5   . A rack  3  is composed of multiple sets of transverse metal wires  32  provided in parallel and multiple sets of longitudinal metal wires  31  provided in parallel interwoven. In the prior art, the spacing between adjacent longitudinal metal wires  31  is relatively large, and the width a of the connecting portion  101  of the hook assembly is less than the spacing d between adjacent longitudinal metal wires  31 . Therefore, the connecting portion  101  can pass between two longitudinal metal wires  31 , and a connection between the hook assembly and the rack  3  is realized by the front hook portion  11  and the rear hook portion  12  receiving adjacent transverse metal wires  32 . However, in some embodiments, it is necessary to reduce the spacing d between adjacent longitudinal metal wires  31 , that is, to form a densely gridded rack  3 , so as to increase the carrying capacity of the rack  3 , or to prevent small-volume items from falling through a gap between longitudinal metal wires  31 . For the densely gridded rack  3 , the spacing d between adjacent longitudinal metal wires  31  of the rack is relatively small, which is less than the width a of the connecting portion  101  of a commonly used hook assembly. If a hook assembly  1  in the prior art is used, its connecting portion  101  cannot enter a gap between two adjacent longitudinal metal wires  31  of the rack  3  due to the interference of the longitudinal metal wires  31 . If the width of the connecting portion  101  is reduced in order to match the smaller spacing d between the longitudinal metal wires  31 , the strength of the entire hook assembly  1  will be affected, and its load-bearing capacity will be reduced. Under this premise, the receiving groove  13  provided on the upper surface of the connecting portion  101  can have an effect. When the hook assembly  1  is installed on the rack  3 , the receiving groove  13  is placed in parallel with the longitudinal metal wires  31 , and a longitudinal metal wire  31  is received in the receiving groove, so that the connecting portion  101  can pass through the rack  3  from bottom to top and will not be interfered by the longitudinal metal wires  31 . The upper part of the rear hook portion  12  is located above a transverse metal wire  32 , and the lower part of the rear hook portion  12  is located below the transverse metal wire  32 , such that the transverse metal wire  32  is surrounded by the rear hook portion  12 . Similarly, the front part of the front hook portion  11  is located in front of an adjacent transverse metal wire  2 , and the rear part of the front hook portion  11  is located behind the transverse metal wire  32 , such that the transverse metal wire  32  is surrounded by the front hook portion  11 . The opening of the rear hook portion  12  is oriented backward, thus restricting a movement of the hook assembly in the vertical direction; and the opening of the front hook portion  11  is oriented downward, thus restricting a movement of the hook assembly in the longitudinal direction. When a longitudinal metal wire  31  is received in the receiving groove  13 , the hook assembly is restricted from moving in the transverse direction. Therefore, when the front hook portion  11  and the rear hook portion  12  are matched with each other, and the spacing therebetween is substantially equal to the spacing between two adjacent transverse metal wires  32 , the hook assembly can connect two transverse metal wires  32  and one longitudinal metal wire  31  at the same time, so that its position is completely limited and fixed relative to the rack  3 . In order to achieve the best position-limiting effect, the diameter of a curve where the front hook portion  11  is located and the diameter of a curve where the rear hook portion  12  is located is set to match the diameter of the transverse metal wire  32 , and the width and depth of the receiving groove  13  are set to match the diameter of the longitudinal metal wire  31 . 
     The entire hook assembly is made of a material with certain elasticity. When the hook assembly needs to be removed from the rack, an external force may be exerted to toggle the front hook portion  11  or the rear hook portion  12 , such that the transverse metal wire  32  is disengaged from the front hook portion  11  or the rear hook portion  12 , thus eliminating the position-limiting on the hook assembly. 
     The lower hook portion  21  is used to receive the hanging rod  4 . When two or more identical hook assemblies are installed at corresponding positions of the rack  3 , the hook assemblies can receive one same hanging rod  4  to increase its load-bearing capacity. Preferably, the diameter of a curve where the lower hook portion  21  is located is set to match the diameter of the hanging rod  4 . 
     In summary,  FIG.  5    shows a shelving assembly comprising a rack  3  and a hook assembly  1 . The hook assembly  1  is connected to the rack  3 . The hook assembly  1  comprises a hook portion  102  and a connecting portion  101 . One end of the hook portion  102  is fixedly connected to the connecting portion  101 . A first surface  14  of the connecting portion  101  is provided with a receiving groove  13  along the length direction of the connecting portion  101 . The receiving groove  13  is used to receive a longitudinal metal wire  31  of the rack  3 . The connecting portion  101  further comprises a front hook portion  11  and a rear hook portion  12  respectively provided at two ends of the connecting portion in its length direction, and the front hook portion  11  and the rear hook portion  12  are respectively connected to transverse metal wires  32  provided adjacently on the rack  3 . 
     In other optional embodiments, it may also be a shelving assembly comprising a rack  3 , a hanging rod  4 , and a hook assembly  1 , as shown in  FIG.  7   . The hook assembly  1  is connected to the rack  3 , and the hanging rod  4  is connected to the hook assembly  1 . 
     The hook assembly  1  comprises a hook portion  102  and a connecting portion  101 . One end of the hook portion  102  is fixedly connected to the connecting portion  101 . A first surface  14  of the connecting portion  101  is provided with a receiving groove  13  along the length direction of the connecting portion  101 . The receiving groove  13  is used to receive a longitudinal metal wire  31  of the rack  3 . The connecting portion  101  further comprises a front hook portion  11  and a rear hook portion  12  respectively provided at two ends of the connecting portion in its length direction, and the front hook portion  11  and the rear hook portion  12  are respectively connected to transverse metal wires  32  provided adjacently on the rack  3 . The hook portion  102  further comprises a lower hook portion  21  (as shown in  FIG.  2   ) provided at a second end  23  thereof, and the lower hook portion  21  is configured to carry the hanging rod  4 . 
     In other optional embodiments, it may also be a shelving assembly comprising a horizontal beam  7 , a vertical beam  6 , a bracket  5 , a rack  3 , a hanging rod  4 , and a hook assembly  1 , as shown in  FIG.  9   . The horizontal beam  7  is fixedly connected to a vertical surface; the vertical beam  6  is slidably connected to the horizontal beam  7 ; the bracket  5  is detachably connected to the vertical beam  6 ; the rack  3  is provided on the bracket  5  and is in contact with the bracket  5 , and the rack  3  comprises longitudinal metal wires  31 ; the hook assembly  1  is connected to the rack  3 ; and the hanging rod  4  is connected to the hook assembly  1 . The hook assembly  1  comprises a connecting portion  101 , the hook assembly  1  is connected to the rack  3  through the connecting portion  101 , and the width a of the connecting portion  101  is greater than the spacing d between adjacent longitudinal metal wires  31  (as shown in  FIG.  1   ). 
     In other optional embodiments, it may also be a shelving assembly comprising a bracket  5 , a rack  3 , a hanging rod  4 , and a hook assembly  1 , as shown in  FIG.  11   . The bracket  5  is fixedly connected to a vertical surface; the rack  3  is provided on the bracket  5  and is in contact with the bracket  5 , and the rack  3  comprises longitudinal metal wires  31 ; the hook assembly  1  is connected to the rack  3 ; and the hanging rod  4  is connected to the hook assembly  1 . The hook assembly  1  comprises a connecting portion  101 , the hook assembly  1  is connected to the rack  3  through the connecting portion  101 , and the width a of the connecting portion  101  is greater than the spacing d between adjacent longitudinal metal wires  31  (as shown in  FIG.  1   ). 
     Embodiment 2 
     In this embodiment, the structure of the hook portion  102  and the connection relationship between the hook portion  102  and the connecting portion  101  are the same as those in Embodiment 1, and will not be repeated here. 
     The difference between this embodiment and Embodiment 1 is that when there are further requirements for the load-bearing capacity of the hook assembly, the width of the connecting portion  101  may be increased to exceed the spacing between adjacent longitudinal metal wires  31  two times, or even three times or four times and so on. Correspondingly, it is only necessary to provide a plurality of parallel receiving grooves  13  on the upper surface of the connecting portion  101  to prevent the longitudinal metal wires  31  from interfering with the connecting portion  101  during installation. Preferably, the spacing between adjacent receiving grooves  13  is equal to the spacing between adjacent longitudinal metal wires  31 . As in Embodiment 1, the width and depth of the receiving groove  13  are preferably set to be consistent with the diameter of the longitudinal metal wire  31 , which can increase the strength of the hook assembly while achieving the best position-limiting effect. 
     Embodiment 3 
     In some applications, the length of the rack  3  is not infinite, but a plurality of racks of a predetermined length are spliced together according to an actual need. As shown in  FIG.  6   , it is formed by splicing a first rack  3  and a second rack  3 ′ together. Therefore, it is usually necessary to provide a connecting piece in the shelving system to ensure the stability of a splicing place of the rack. 
     In this embodiment, the structure of the connecting portion  101 , the structure of the hook portion  102 , and the connection relationship between the connecting portion  101  and the hook portion  102  are the same as those in the Embodiment 1, and will not be repeated here. 
     In this embodiment, the width of the receiving groove  13  on the connecting portion  101  is set to be able to receive two longitudinal metal wires  31  provided side by side. As shown in  FIG.  6   , specifically, the two longitudinal metal wires are respectively a longitudinal metal wire  31  located at the most edge of the first rack  3  and a longitudinal metal wire  31 ′ at the most edge of the second rack  3 ′. The longitudinal metal wire  31  and the longitudinal metal wire  31 ′ are provided adjacently in parallel, that is, the longitudinal metal wire  31  located at the most edge of the first rack  3  is provided adjacent to the second rack  3 ′, and the longitudinal metal wire  31 ′ at the most edge of the second rack  3 ′ is provided adjacent to the first rack  3 . More preferably, the width of the receiving groove  13  is equal to the sum of the diameters of the longitudinal metal wire  31  and the longitudinal metal wire  31 ′. Since the longitudinal metal wire  31  and the longitudinal metal wire  31 ′ usually adopt the same diameter as other longitudinal metal wires  31 , that is, the width of the receiving groove  13  is equal to twice the diameter of the longitudinal metal wire  31 , the receiving groove  13  just receives two longitudinal metal wires provided side by side. When the two longitudinal metal wires  31 ,  31 ′ are placed side by side in the receiving groove  13 , due to the mutual position-limiting between side walls of the receiving groove  13  and the two longitudinal metal wires  31 ,  31 ′, the connection between the two adjacent racks  3 ,  3 ′ is stable. That is, the hook assembly itself becomes a connecting piece between two adjacent racks, so there is no need to additionally provide a rack connecting piece in the shelving system. In this embodiment, in order to allow the longitudinal metal wires  31 ,  31 ′ belonging to two adjacent racks to be received in the receiving groove  13 , at end positions, the transverse metal wires  32 ,  32 ′ belonging to the two racks  3 ,  3 ′ needs to be flush with the longitudinal metal wires  31 ,  31 ′ at the most edge, so as to avoid mutual interference, which also do not reduce the welding strength between the racks  3 ,  3 ′ at the same time. 
     In other similar embodiments, if the load-bearing capacity of the hook assembly needs to be increased, the width of the connecting portion  101  can be further increased. It is only necessary to provide a plurality of receiving grooves  13  at corresponding positions of a plurality of longitudinal metal wires  31  to achieve the same technical effect. 
     In summary,  FIG.  6    shows a shelving assembly comprising at least two racks  3 ,  3 ′ and a hook assembly  1 , wherein the two racks  3 ,  3 ′ are provided adjacently. The hook assembly  1  is connected to a joint between the two racks  3 ,  3 ′. The hook assembly  1  comprises a hook portion  102  and a connecting portion  101 . One end of the hook portion  102  is fixedly connected to the connecting portion  101 . A first surface  14  of the connecting portion  101  is provided with a receiving groove  13  along the length direction of the connecting portion  101 . The receiving groove  13  is used to receive longitudinal metal wires  31 ,  31 ′ of the racks  3 ,  3 ′. The connecting portion  101  further comprises a front hook portion  11  and a rear hook portion  12  respectively provided at two ends of the connecting portion in its length direction, and the front hook portion  11  and the rear hook portion  12  are detachably connected to transverse metal wires  32 ,  32 ′ provided adjacently on the racks  3 ,  3 ′, respectively. 
     In other optional embodiments, it may also be a shelving assembly comprising at least two racks  3 ,  3 ′, a hanging rod  4 , and a hook assembly  1 , wherein the two racks  3 ,  3 ′ are provided adjacently, as shown in  FIG.  8   . The hook assembly  1  is connected to a joint between the two racks  3 ,  3 ′. The hanging rod  4  is connected to the hook assembly  1 . The hook assembly  1  comprises a hook portion  102  and a connecting portion  101 . One end of the hook portion  102  is fixedly connected to the connecting portion  101 . A first surface  14  of the connecting portion  101  is provided with a receiving groove  13  along the length direction of the connecting portion  101 . The receiving groove  13  is used to receive longitudinal metal wires  31 ,  31 ′ of the racks  3 ,  3 ′. The connecting portion  101  further comprises a front hook portion  11  and a rear hook portion  12  respectively provided at two ends of the connecting portion in its length direction, and the front hook portion  11  and the rear hook portion  12  are detachably connected to transverse metal wires  32 ,  32 ′ provided adjacently on the racks  3 ,  3 ′, respectively. The hook portion  102  further comprises a lower hook portion  21  (as shown in  FIG.  2   ) provided at a second end  23  thereof, and the lower hook portion  21  is configured to receive the hanging rod  4 . 
     In other optional embodiments, it may also be a shelving assembly comprising a horizontal beam  7 , a vertical beam  6 , a bracket  5 , two racks  3 ,  3 ′ provided adjacently, a hanging rod  4 , and a hook assembly  1 , as shown in  FIG.  10   . The horizontal beam  7  is fixedly connected to a vertical surface; the vertical beam  6  is slidably connected to the horizontal beam  7 ; the bracket  5  is detachably connected to the vertical beam  6 ; the racks  3 ,  3 ′ are provided on the bracket  5  and are in contact with the bracket  5 , and the racks  3 ,  3 ′ comprise longitudinal metal wires  31 ,  31 ′; the hook assembly  1  is connected to a joint between the two racks  3 ,  3 ′; and the hanging rod  4  is connected to the hook assembly  1 . The hook assembly  1  comprises a connecting portion  101 , and the hook assembly  1  is connected to the rack  3  through the connecting portion  101 . The hook assembly  1  is respectively connected to the two racks  3 ,  3 ′ provided adjacently through the connecting portion  101 . 
     In other optional embodiments, it may also be a shelving assembly comprising a bracket  5 , at least two racks  3 ,  3 ′ provided adjacently, a hanging rod  4 , and a hook assembly  1 , as shown in  FIG.  12   . The bracket  5  is fixedly connected to a vertical surface; the racks  3 ,  3 ′ are provided on the bracket  5  and are in contact with the bracket  5 , the racks  3  comprise longitudinal metal wires  31 ,  31 ′; the hook assembly  1  is connected to the rack  3 ; and the hanging rod  4  is connected to the hook assembly  1 . The hook assembly  1  comprises a connecting portion  101 , and the hook assembly  1  is connected to a joint between the two racks  3 ,  3 ′. The hanging rod  4  is connected to the hook assembly  1 . The hook assembly  1  comprises a connecting portion  101 , and the hook assembly  1  is connected to the rack  3  through the connecting portion  101 . The hook assembly  1  is respectively connected to the two racks  3 ,  3 ′ provided adjacently through the connecting portion  101 . 
     It should be noted that the plurality of embodiments mentioned above only represent a few typical representatives of the present invention, but they should not be understood as a limitation on the scope of the invention patent. Other embodiments obtained through simple replacements and modifications fall within the scope of protection of the present invention. Various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combinations of these technical features, all of the combinations shall be considered to fall within the scope of the specification. 
     The preferred embodiments of the present application are described in detail above. It should be understood that those of ordinary skills in the art may make many modifications and changes according to the concept of the present application without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present application and the prior art should fall within the scope of protection defined by the claims.