Patent Publication Number: US-11654523-B2

Title: Cement surface grinding device

Description:
FIELD OF THE INVENTION 
     The present invention is related to cement grinding, and in particular to a cement surface grinding device. 
     BACKGROUND OF THE INVENTION 
     In civil engineering, it is often necessary to pave cement on ground. Firstly, wet cement is paved on the ground, and then grinding knives are used to flat the cement. The grinding knives are installed on a vehicle which has a grinding knife device which has a rotatable frame and a plurality of grinding knives installed on the frame. The grinding knives have the function of flattening wet cement ground. 
     In above mentioned prior art, the grinding knives cannot completely flat the ground because after the cement is solidified, the cement ground is still uneven. This is not beneficial for the succeeding works and it also presents an unbeautiful outlook. If it is desired to flatten the solidified cement ground, another tools are necessary. This causes overall cost to be increased. 
     SUMMARY OF THE INVENTION 
     Accordingly, the object of the present invention is to provide a cement surface grinding device, wherein a connecting frame is installed with a replaceable central disk and at least one outer rotary disk and the bottom of the outer rotary disk is arranged with at least one grinding sheet. The connecting frame on a cement grinding vehicle may be original installed with grinding knives. In use, it is only needed to detach the grinding knives, and then the central disk and the outer rotary disk are installed thereon. Then by moving the vehicle, the cement surface can be ground. Therefore, the use of the present invention is very convenient. No more vehicle is needed. In the present invention, the outer rotary disks are arranged on the periphery of the central disk so as to have a large grinding area. By the revolution of the outer rotary disks with respective to the central disk and the rotation of the outer rotary disks, the cement surface may be ground effectively so that the whole cement surface is uniformly ground to present a beautiful outlook. This is beneficial to the succeeding works. 
     To achieve above object, the present invention provides cement surface grinding device, comprising: a central disk; a center of the central disk being connected and extended upwards with a central shaft; the central disk being rotary with respect to the central shaft; a bottom of the central disk being installed with a central pad; at least one outer rotary disk arranged around the central disk; a bottom of the outer rotary disk being installed with a grinding sheet; a rotary frame arranged above the central disk and the at least one outer rotary disk; the rotary frame including a connecting frame and a plurality of connecting rods; an upper side of the central shaft being connected to a central hole of a seat and the seat being connected to a lower side of the connecting frame; an inner end of the connecting rod being detachably connected to a respective outer end of the connecting frame; an outer end of the connecting rod being connected to a respective one of the outer rotary disk; a center of the connecting frame being a through hole; each outer rotary disk being formed with an outer belt wheel and the central disk being formed with a connecting element; a belt winding around the connecting element and the outer belt wheel; wherein in operation, the through hole of the connecting frame serves to receive an outer driving source so as to drive the connecting frame of the rotary frame to rotate and then the plurality of connecting rods and the central shaft are driven to rotate; rotation of the connecting frame will drive the outer rotary disks to rotate around a periphery of the central disk, while the central disk does not rotate so that the belt drive the outer belt wheel to rotate and thus the outer rotary disks are driven to rotate; by the rotation of the outer rotary disks and the revolution of the outer rotary disk with respective to the central disk, the outer grinding sheets are driven to grind the cement surface; the cement surface is a concrete surface in that the cement is solidified. 
    
    
     
       DETAILED DESCRIPTION OF THE INVENTION 
         FIG.  1    is a schematic view showing the assembly of the elements of the present invention. 
         FIG.  2    is a schematic cross section view along line A-A′ in  FIG.  1   . 
         FIG.  3    is a bottom view of the present invention. 
         FIG.  4    is a schematic view showing the application of the present invention. 
         FIG.  5    is a schematic cross section view along line B-B′ of  FIG.  4   . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 
     With reference to  FIGS.  1  to  5   , the structure of the present invention is illustrated. 
     A central disk  10  is included. A center of the central disk  10  is connected and extended upwards with a central shaft  11 . The central disk  10  is rotary with respect to the central shaft  11 . A bottom of the central disk  10  is installed with a central pad  15  which is slide proof, such as made of rubber. 
     At least one outer rotary disk  20  are arranged around the central disk  10 . Preferably there are a plurality of outer rotary disks  20 , such as there are four or five outer rotary disks  20 .  FIG.  1    shows a structure which includes four outer rotary disks  20  which are arranged with equal space. A bottom of the outer rotary disk  20  is installed with a grinding sheet  25 . Preferably, there are a plurality of grinding sheets  25 .  FIGS.  2  and  3    show a structure which includes three grinding sheets  25 . The plurality of grinding sheets  25  of each outer rotary disk  20  are distant with an equal space and are arranged circularly around a periphery of the outer rotary disk  20 . Between one outer rotary disk  20  and the respective grinding sheet  25  is arranged with an elastic structure  251  which the grinding sheet  25  can sufficient adhere on the ground. The elastic structure  251  may be a rubber pad or a spring. 
     A rotary frame  60  is arranged above the central disk  10  and the at least one outer rotary disk  20 . The rotary frame  60  includes a connecting frame  30  and a plurality of connecting rods  70 . An upper side of the central shaft  11  is connected to a central hole of a seat  32  and the seat  32  is connected to a lower side of the connecting frame  30 . An inner end  701  of the connecting rod  70  is detachably connected to a respective outer end of the connecting frame  30 . An outer end  702  of the connecting rod  70  is connected to a respective one of the outer rotary disk  20 . A center of the connecting frame  30  has a through hole  35 . As illustrated in  FIGS.  4  and  5   , in operation, the through hole  35  of the connecting frame  30  serves to be connected with an outer driving source  100  (such as a motor or an engine) so as to drive the connecting frame  30  of the rotary frame  60  to rotate and then the plurality of connecting rods  70  and the central shaft  11  are driven to rotate. 
     The connecting frame  30  includes a plurality of supporting rods  31 . Each supporting rod  31  is inserted into a connected hole  71  in the inner end  701  of the connecting rod  70 . 
     Each outer rotary disk  20  is formed with an outer belt wheel  26  and the central disk  10  is formed with a connecting element  17 . A belt  40  winds around the connecting element  17  and the outer belt wheel  26 . 
     Rotation of the connecting frame  30  will drive the outer rotary disks  20  to rotate around a periphery of the central disk  10 , while the central disk  10  does not rotate so that the belt  40  drive the outer belt wheel  26  to rotate and thus the outer rotary disks  20  are driven to rotate. By the rotation of the outer rotary disks  20  and the revolution of the outer rotary disk  20  with respective to the central disk  10 , the outer grinding sheets  25  are driven to grind the cement surface. The cement surface is a concrete surface in that the cement is solidified. 
     In practical use, the cement grinding device  1  of the present invention is installed to the bottom of a vehicle (not shown). The vehicle is installed with grinding knives (not shown). In the present invention, the connecting frame  30  of the rotary frame  60  is a frame which is the original frame for installing the grinding knives. In use the grinding knives are detached from supporting rods  31  of the connecting frame  30  and the plurality of connecting rods  70  are installed to the supporting rods  31 . Then the upper end of the central shaft  11  is connected to the lower side of the connecting frame  30  through the seat  32 . Since the driving source  100  of the vehicle is connected to the through hole  35  of the connecting frame  30 , it can drive the rotary frame  60  to further drive the outer grinding sheets  25  of the outer rotary disk  20  to cause the grinding sheets  25  of the outer rotary disk  20  to revolve around the central disk  10  and the outer grinding sheets  25  also rotate. By movement of the vehicle, the cement surface is ground so that the surface of the cement surface is flattened. In use, the bottom of the vehicle can be arranged with a plurality of cement surface grinding device  1  of the present invention. 
     A center of the outer rotary disk  20  has an installing hole  22 . An inner side of the installing hole  22  is installed with a bearing  221 . A shaft body  21  extends from the outer end  702  of each connecting rod  70  and then enters into the bearing  221  in the installing hole  22  of the outer rotary disk  20  so that the outer rotary disk  20  rotates with respect to the shaft body  21 . A center of the central disk  10  has a through hole  12 . The through hole  12  of the central disk  10  has a bearing  121 . The central shaft  11  is connected to the bearing  121  of the through hole  12  of the central disk  10 . 
     The connecting element  17  of the central disk  10  is a rotatable central belt wheel  16  which is coaxial with the central shaft  11 . The belt  40  is combined to the outer belt wheel  26  and the central belt wheel  16 . The outer belt wheel  26  is coaxial with the shaft body  21 . 
     One side of each connecting rod  70  has a plurality of retaining holes  72  which are communicated with respective connecting holes  71 . Each retaining hole  72  is installed with a retaining screw  721  for retaining connecting rod  70  in the connecting hole  71 . 
     An outer side of each connecting rod  70  is formed with a screw hole  73  which is communicated with the respective connecting hole  71 . An adjustable screw  731  is installed within the screw hole  73 . When the adjustable screw  731  moves inwards, it will resist against the supporting rod  31  in the connecting hole  71  so that the connecting rod  70  moves outwards so that the respective outer rotary disk  20  and outer belt wheel  26  move outwards. As a result, the outer belt wheel  26  pushes the belt  40  outwards so as to increase the combining strength between the belt  40  and the outer belt wheel  26 . 
     As illustrated in  FIG.  2   , a plurality of springs  50  are arranged between the central disk  10  and the central pad  15 . When the central pad  15  or the outer grinding sheets  25  are worn and become thinner, the springs  50  will push the central pad  15  so that the central pad  15  and the outer grinding sheets  25  are retained in same plane so as to retain the steadiness of the whole cement surface grinding device  1  of the present invention. 
     Advantages of the present invention are that a connecting frame is installed with a replaceable central disk and at least one outer rotary disk and the bottom of the outer rotary disk is arranged with at least one grinding sheet. The connecting frame on a cement grinding vehicle may be original installed with grinding knives. In use, it is only needed to detach the grinding knives, and then the central disk and the outer rotary disk are installed thereon. Then by moving the vehicle, the cement surface can be ground. Therefore, the use of the present invention is very convenient. No more vehicle is needed. In the present invention, the outer rotary disks are arranged on the periphery of the central disk so as to have a large grinding area. By the revolution of the outer rotary disks with respective to the central disk and the rotation of the outer rotary disks, the cement surface may be ground effectively so that the whole cement surface is uniformly ground to present a beautiful outlook. This is beneficial to the succeeding works. 
     The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.