GB2605983A

GB2605983A - Grinding device for a cement walk-behind trowel machine

Info

Publication number: GB2605983A
Application number: GB2105618.9A
Authority: GB
Inventors: Yang Yun-Jui; Li Shun-Jhong; Cheng Pai Ming
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2022-10-26
Also published as: GB202105618D0

Abstract

A grinding device for a cement walk-behind trowel machine which is installed to a power output shaft of a power source of a cement walk-behind trowel machine, the grinding device comprising: a rotation frame including a primary body and a plurality of supporting frames connected to the primary body; a central disk located below the seat; a center of the central disk having an installing hole; a rotating shaft being installed in the installing hole; and a plurality of outer disks arranged around the periphery of the central disk. When the power output shaft rotates, the power output shaft drives the relation frame to rotate so that the outer disks revolve around the central disk; as a result, the outer grinding sheets rotate around the central disk so as to grind the surface of the cement ground.

Description

GRINDING DEVICE FOR A CEMENT WALK-BEHIND TROWEL MACHINE

FIELD OF THE INVENTION

The present invention is related to cement grinding and, in particular, to a grinding device for a cement walk-behind trowel machine (ride-on trowel machine).

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 flatten the cement. The grinding knives are installed on a walk-behind trowel machine (ride-on trowel machine) which has a grinding knife device. It has a rotatable frame and a plurality of grinding knives installed thereon. The grinding knives have the function of flattening wet cement around.

In the 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, other tools are necessary. This causes overall costs to be increased.

SUMMARY OF THE INVENTION

Accordingly, the object of the present invention is to provide a grinding device for a cement walk-behind trowel machine (ride-on trowel machine), 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 originally 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. By the revolution of the outer rotary disks with respect 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 objects, the present invention provides a grinding device for a cement walk-behind trowel machine (ride-on trowel machine), which is installed to an power output shaft of a power source of a cement walk-behind trowel machine, the grinding device comprising: a rotation frame including a primary body and a plurality of supporting frames connected to the primary body; a center of the primary body having a through hole; in assembly, the power output shaft of the power source being inserted into the through hole so that the power source can drive the rotation frame to rotate; each supporting frame extending from the primary body; the rotation frame being installed above a seat; a central disk located below the seat; a center of the central disk having an installing hole; a rotating shaft being installed in the installing hole; the rotating shaft being fixed therein by using a stepped bearing so that rotation of the rotating shaft does not drive the central disk; the rotating shaft extending from the installing hole upwards; an upper end of the rotating shaft connected to the seat; the through hole and the rotating shaft being coaxial: when the rotation frame rotates, the seat is driven to rotate so as to drive the rotating shaft to rotate; and a plurality of outer disks arranged around the periphery of the central disk; a center of each outer disk having an assembly hole; an axial post being installed in the assembly hole; an upper end of each axial post being connected to an outer end of a respective one supporting frame; a bottom of each outer disk being installed with at least one outer grinding sheet; and wherein, when the power output shaft rotates, the power output shaft will drive the rotation frame to rotate so that the outer disks revolve around the central disk; as a result, the outer grinding sheets rotate around the central disk so as to grind the surface of the cement ground,

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 is a schematic view of the present invention.

Fig. 2 is a front schematic view about the assembly of the present invention. Fig. 3 is an elevational view of the present invention.

Fig. 4 is a schematic view showing that the present invention is assembled to a two head cement walk-behind trowel machine.

Fig. 5 is a schematic view showing that the present invention is assembled to a single head cement walk-behind trowel machine.

Fig. 6 is a schematic view showing the adjustment of the tightness of the present invention.

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.

The grinding unit 5 of the present invention is installed to the power output shaft 61 of the power source 60 of a cement walk-behind trowel machine (ride-on trowel machine) 6, which may have two grinding sets (referring to Fig. 4) or a single grinding set (referring to Fig. 5). The grinding unit 5 includes the following elements.

A rotation frame 1 includes a primary body 11 and a plurality of supporting frames 12 connected to the primary body 11. A center of the primary body 11 has a through hole 111. In assembly, the power output shaft 61 of the power source 60 is inserted into the through hole III so that the power source 60 can drive the rotation frame 1 to rotate. Each supporting frame 12 extends from the primary body 11. The rotation frame 1 is installed above a seat 14.

A central disk 2 is below the seat 14. A center of the central disk 2 has an installing hole 25. A rotating shaft 21 is installed in the installing hole 25. The rotating shaft 21 is fixed therein by using a stepped bearing 251 so that rotation of the rotating shaft 21 does not drive the central disk 2 (referring to Fig. 2). The rotating shaft 21 extends from the installing hole 25 upwards. An upper end of the rotating shaft 21 connected to the seat 14. The through hole 111 and the rotating shaft 21 are coaxial. When the rotation frame 1 rotates, the seat 14 is driven to rotate so as to drive the rotating shaft 21 to rotate.

A plurality of outer disks 3 are arranged around the periphery of the central disk 2. A center of each outer disk 3 has an assembly hole 35. An axial post 31 is installed in the assembly hole 35. An upper end of each axial post 31 is connected to an outer end 22 of a respective one supporting frame 12. A bottom of each outer disk 3 is installed with at least one outer grinding sheet 32. In this example, the grinding unit 5 includes four outer disks 3. A bottom of each outer disk 3 is installed with three outer grinding sheets 32.

In grinding a surface of the cement ground (referring to Figs. 1 to 3), the grinding unit 5 of the present invention may be installed to a two head walk-behind trowel machine 6 (see Fig. 4) or to a one head walk-behind trowel machine 7 (see Fig. 5). In assembly, the power output shaft 61 of the power source 60 of the grinding machine 5, 6 is inserted into the through hole 111 of the rotation frame 1. When the power source 60 operates, the power output shaft 61 will drive the grinding unit 5 to grind. Preferably, the power source 60 is a motor or an engine.

When the power output shaft 61 rotates, the power output shaft 61 will drive the rotation frame 1 to rotate so that the outer disks 3 revolve around the central disk 2. As result, the outer grinding sheets 32 rotate around the central disk 2 so as to grind the surface of the cement ground.

An outer periphery of the central disk 2 is formed with an outer teeth unit 231 so that the whole structure is as a central belt wheel 23 (referring to Figs. 1 to 3). Each outer disk 3 includes disk body 37 and an outer belt wheel 33 fixed to the disk body 37. The assembly hole 35 is formed in a center of the outer belt wheel 33. A lower end of the axial post 31 is fixed to the assembly hole 35 of the outer disk 3 by using a stepped bearing 351 to buckle the axial post 31 therein. The outer grinding sheets 32 are installed at a bottom of the disk body 37. The grinding unit 5 of the present invention further includes a transfer unit 4 which encircles the central belt wheel 23 and the outer belt wheels 33. When the rotation frame 1 rotates, the outer grinding sheets 32 of the outer disks 3 are driven to revolve around the central disk 2 to grind and moreover the transfer unit 4 further drives the outer belt wheels 33 to rotate and the outer disks 3 rotates around a center of itself. As a result each outer grinding sheet 32 revolves around the axial post 31 of the outer disk 3 so as to further grind. Then, the central belt wheel 23 may rotate or not rotate with the transfer unit 4. The transfer unit 4 may be a belt or chain 23.

Preferably, each supporting frame 12 of the rotation frame 1 is spaced with an equal space.

In the preferred embodiment of the present invention, a lower side of the central belt wheel 23 is arranged with a slide proof pad 22 (referring to Fig. 2). A plurality of elastic bodies 24 are arranged between the central belt wheel 23 and the slide proof pad 22. By the elasticity of the elastic bodies 24, the slide proof pad 24 may move up and down for generating slide proof effect to the rotation of the outer disk 3 and to reduce the rotation speed of the central disk 2 by the slide proof between the slide proof pad 22 and the cement surface. Therefore, since the diameter of the central belt wheel 23 is larger than that of the outer belt wheel 33, the speed reduction of the central belt wheel 23 will cause the transfer unit 4 properly adjusts the rotation speed of the outer belt wheel 33.

Referring to Fig. 2, each supporting frames 12 includes an insertion tube 123, a rod body 124 and an engaging tube 125. The insertion tube 123 horizontally extends from the primary body 11. The insertion tube 123 has an insertion groove 1231. The engaging tube 125 has a passing groove 1251. An inner end of the rod body 124 is inserted into the insertion groove 1231. An outer end of the rod body 124 inserted into the passing groove 1251. The engaging tube 125 is connected to an upper end the axial post 31 of the outer disk 3.

A surface of the rod body 124 is formed with an axial first plane 1241. An inner surface of the insertion groove 1231 is formed with a second plane 1232 corresponding to the first plane 1241 of the rod body 124. An inner surface of the passing groove 1251 is formed with a third plane 1252 corresponding to the first place 1241 of the rod body 124. When the rod body 124 inserts into the insertion groove 1231 of the insertion tube 123 and the passing groove 1251 of the engaging tube 125, the first plane 1251 is aligned with the second plane 1232 and the second plane 1252 so that the insertion tube 123, the rod body 124 and the engaging tube are not rotated axially therebetween.

The engaging tube 125 is formed with at least one fixing locking hole 41 which is communicated to the passing groove 1251 and corresponding to a lateral wall of the third plane 1252. A first lock unit 40 is locked to the fixing locking hole 41. An inner side of the first locking unit 40 resists against the first plane 1241 so as to fix the rod body 124.

An outer side of the engaging tube 125 is formed with an adjusting hole 51 which is communicated with the passing groove 1251. The adjusting hole 51 communicates to a second locking unit 50. An inner lateral side of the first locking unit 50 resists against an outer lateral side of the rod body 124.By adjusting a length of an inner end of the second locking unit 50 inserted into the passing groove 1251, the length of the rod body 124 inserted into the passing groove 1251 is changed so as to adjust the length of the supporting frame 12. Therefore, the position of the outer disk 3 is changed and thus the tightness of the transfer unit 4 encloses the outer belt wheel 33 is adjusted (referring to Fig. 6).

Therefore, when the rotation frame 1 rotates, the transfer unit 4 may drive the outer belt wheel 33.

Advantages of the present invention are that, 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 vehicles are 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, but it will be obvious that the same may be varied in many ways. Such variations arc 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.

Claims

WHAT IS CLAIMED IS: I. A grinding device for a cement walk-behind trowel machine which is installed to a power output shaft of a power source of a cement walk-behind trowel machine, the grinding device comprising: a rotation frame including a primary body and a plurality of supporting frames connected to the primary body; a center of the primary body having a through hole; in assembly, the power output shaft of the power source being inserted into the through hole so that the power source can drive the rotation frame to rotate; each supporting frame extending from the primary body; the rotation frame being installed above a seat; a central disk located below the seat; a center of the central disk having an installing hole; a rotating shaft being installed in the installing hole; the rotating shaft being fixed therein by using a stepped bearing so that rotation of the rotating shaft does not drive the central disk to rotate; the rotating shaft extending from the installing hole upwards; an upper end of the rotating shaft connected to the seat; the through hole and the rotating shaft being coaxial; when the rotation frame rotates, the seat is driven to rotate so as to drive the rotating shaft to rotate; and a plurality of outer disks arranged around the periphery of the central disk; a center of each outer disk having an assembly hole; an axial post being installed in the assembly hole; an upper end of each axial post being connected to an outer end of a respective one supporting frame; a bottom of0 each outer disk being installed with at least one outer grinding sheet; and wherein when the power output shaft rotates, the power output shaft drives the rotation frame to rotate so that the outer disks revolve around the central disk; as a result, the outer grinding sheets rotate around the central disk so as to grind the surface of the cement ground.
2. The grinding device for a cement walk-behind trowel machine as claimed in claim 1, wherein an outer periphery of the central disk is formed with an outer teeth unit so that the whole structure is as a central belt wheel; each outer disk includes disk body and an outer belt wheel fixed to the disk body; the assembly hole is formed in a center of the outer belt wheel; a lower end of the axial post is fixed to the assembly hole of the outer disk; the outer grinding sheets are installed at a bottom of the disk body; the grinding unit further includes a transfer unit which encircles the central belt wheel and the outer belt wheels; when the rotation frame rotates, the outer grinding sheets of the outer disks are driven to revolve around the central disk to grind and moreover the transfer unit further drives the outer belt wheels to rotate and the outer disks rotate around a center of itself; as a result each outer grinding sheet revolves around the axial post of the outer disk so as to further grind; then, the central belt wheel rotates or do not rotate with the transfer unit.
3. The grinding device for a cement walk-behind trowel machine as claimed in claim I, wherein all the supporting frames of the rotation frame are spaced with an equal space.
4. The grinding device for a cement walk-behind trowel machine as claimed in claim 1, wherein a lower side of the central belt wheel is arranged with a slide proof pad; a plurality of elastic bodies are arranged between the central belt wheel and the slide proof pad.
5. The grinding device for a cement walk-behind trowel machine as claimed in claim 2, wherein each supporting frames includes an insertion tube, a rod body and an engaging tube; the insertion tube horizontally extends from the primary body; the insertion tube has an insertion groove; the engaging tube has a passing groove; an inner end of the rod body is inserted into the insertion groove; an outer end of the rod body inserted into the passing groove; and the engaging tube is connected to an upper end the axial post of the outer disk.
6. The grinding device for a cement walk-behind trowel machine as claimed in claim 5, wherein a surface of the rod body is formed with an axial first plane; an inner surface of the insertion groove is formed with a second plane corresponding to the first plane of the rod body; an inner surface of the passing groove is formed with a third plane corresponding to the first place of the rod body; when the rod body inserts into the insertion groove of the insertion tube and the passing groove of the engaging tube, the first plane is aligned with the second plane and the second plane so that the insertion tube, the rod body and the engaging tube are not rotated axially therebetween.
7. The grinding device for a cement walk-behind trowel machine as claimed in claim 6, wherein the engaging tube is formed with at least one fixing locking hole which is communicated to the passing groove and corresponding to a lateral wall of the third plane; a first lock unit is locked to the fixing locking hole; an inner side of the first locking unit resists against the first plane so as to fix the rod body.
8. The grinding device for a cement walk-behind trowel machine as claimed in claim 5, wherein an outer side of the engaging tube is formed with an adjusting hole which is communicated with the passing groove; the adjusting hole communicates to a second locking unit; an inner lateral side of the first locking unit resists against an outer lateral side of the rod body; by adjusting a length of an inner end of the second locking unit inserted into the passing groove, the length of the rod body inserted into the passing groove is changeable so as to adjust the length of the supporting frame.
9. The grinding device for a cement walk-behind trowel machine as claimed in claim 2, wherein the rotating shaft being fixed therein by using a stepped bearing to buckle the axial post therein.
10. The grinding device for a cement walk-behind trowel machine as claimed in claim 2, wherein the transfer unit is a belt or a chain.