CN220427879U - Vibration sanding mechanism of sanding equipment - Google Patents

Abstract

The utility model discloses a vibration sanding mechanism of sanding equipment, which is characterized by comprising a frame, a pressing head support, an abrasive belt sanding assembly and a vibrating head assembly, wherein the pressing head support and the abrasive belt sanding assembly are respectively arranged on the frame, the vibrating head assembly is arranged on the pressing head support, the abrasive belt sanding assembly comprises an abrasive belt driving device, an abrasive belt driving wheel, an abrasive belt driven wheel and an abrasive belt sleeved outside the abrasive belt driving wheel and the abrasive belt driven wheel, the abrasive belt driving device is connected with the abrasive belt driving wheel to drive the abrasive belt driving wheel, and the vibrating head assembly is movably propped against the abrasive belt. The utility model has the advantages of simple structure, good stability, high processing precision and uniform sanding.

Description

Vibration sanding mechanism of sanding equipment

Technical Field

The utility model relates to the technical field of sanding equipment, in particular to a vibration sanding mechanism of sanding equipment.

Background

Currently, products such as iron, stainless steel, wood and the like generally need to be polished and polished in the production process. The existing sanding equipment adopts a pressing plate to press an abrasive belt and a nylon belt to polish the surface of a workpiece, and the operation process generally adopts a manual control pressing plate to smooth the surface of the workpiece, so that a certain polishing effect can be obtained. However, the defect is that in the polishing operation process, the polishing pressure cannot be kept stable, so that the surface of the workpiece is unevenly polished, damage is easily left on the workpiece, the production quality and the production efficiency are reduced, and the large-size workpiece cannot be precisely machined in a manual operation mode, so that obvious defects exist. To this end, the present patent inventor discloses a sanding apparatus in chinese patent grant publication No. CN211615192U, comprising: the sand flattening device comprises an abrasive belt, a plurality of guide wheels and a rotating motor for driving the abrasive belt to rotate around the guide wheels, and is characterized in that the sand flattening device is provided with a guide rail, a pressing plate mechanism connected with the guide rail in a sliding manner, and a driving device for driving the pressing plate mechanism to move along the guide rail, and the pressing plate mechanism is in movable propping fit with the abrasive belt. The polishing efficiency is effectively improved, and the polishing uniformity of the surface of the workpiece is effectively improved; but has the disadvantages that: firstly, the pressing plate mechanism is also required to be matched with an eccentric device, and the eccentric device is driven by a motor, so that the weight of the pressing plate mechanism is greatly increased, the power loss is improved, and the cost is increased; secondly, in the sanding process, due to the continuous jacking action of the pressing plate, sand marks can be left on the surface of the workpiece by the abrasive belt, so that the sanded surface is uneven. For this reason, there is a need for further improvements in the art to meet the production requirements.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provides the vibration sanding mechanism of the sanding equipment, which has the advantages of stability, reliability, high processing precision, convenient operation control and high cost performance.

The utility model adopts the following technical proposal to realize the aim: the utility model provides a vibration sanding mechanism of sanding equipment, its characterized in that, it includes frame, pressure head support, abrasive band sanding subassembly, vibrating head subassembly, pressure head support and abrasive band sanding subassembly set up respectively in the frame, vibrating head subassembly sets up on the pressure head support, abrasive band sanding subassembly includes abrasive band drive arrangement, abrasive band action wheel, abrasive band follow driving wheel and cover establish the abrasive band outside abrasive band action wheel, abrasive band follow driving wheel, abrasive band drive arrangement connects and drives the abrasive band action wheel, vibrating head subassembly activity roof pressure is on the abrasive band.

As a further explanation of the scheme, the sanding equipment is one of a sand flattening machine, a sand edge machine, a key sanding machine and a fixed-thickness sanding machine.

Further, sanding equipment is flat sand structure, and the pressure head support includes pressure head crossbeam, hold-in range module, slider seat, and the hold-in range module is fixed on the pressure head crossbeam, and the slider seat activity sets up on the hold-in range module, and the hold-in range module drives the slider seat and transversely reciprocates.

Further, be fixed with the vibration lifter plate on the slider seat, be provided with lift actuating mechanism on the vibration lifter plate, lift actuating mechanism includes cylinder fixing base, cylinder subassembly, air-vent valve, and the cylinder fixing base is fixed on the vibration lifter plate, and the cylinder subassembly is fixed on the cylinder fixing base, connects and drives the vibrating head subassembly, and the air-vent valve is connected with the cylinder subassembly, through adjusting the air-vent valve, can change the output pressure of adjusting the cylinder subassembly to adjust the pressure of vibrating head subassembly roof pressure abrasive band.

Further, the upper part of the vibration lifting plate is provided with a concave position, the cylinder fixing seat comprises a top plate, a back plate, a left side plate and a right side plate, the back plate is vertically fixed at the bottom of the top plate, and the left side plate and the right side plate are connected between the top plate and the back plate; the top plate extends backwards to form a convex edge, the convex edge is matched with the concave position in a concave-convex mode, and the cylinder assembly is fixed on the top plate.

Further, the sliding block seat is provided with a horizontally arranged drag chain plate, the drag chain plate is provided with an outwards extending approach switch seat, and the approach switch seat is provided with an approach switch.

Further, an abrasive belt supporting wheel is arranged between the abrasive belt driving wheel and the abrasive belt driven wheel, and the abrasive belt driving wheel, the abrasive belt supporting wheel and the abrasive belt driven wheel are distributed in a triangular mode.

Further, a motor seat and a bearing seat plate are arranged on the frame, the abrasive belt driving device comprises an abrasive belt driving motor, a driving belt pulley, a driven belt pulley and a V-belt, and the belt driving motor is fixed on the motor seat; the V-belt is sleeved outside the driving pulley and the driven pulley, the bearing seat plate is provided with a driving wheel shaft, and the abrasive belt driving wheel and the driven pulley are respectively connected and fixed at two ends of the driving wheel shaft.

Further, a guide rail seat is arranged on the pressure head cross beam, a plurality of supporting seats are distributed on the guide rail seat along a straight line, and the synchronous belt module is fixedly connected with the guide rail seat through the plurality of supporting seats.

Further, a beam seat corresponding to the pressure head beam is arranged on the inner side of the frame, and the pressure head beam is horizontally fixed on the beam seat; the outside of the frame is provided with a driven wheel seat, and the abrasive belt driven wheel is movably arranged on the driven wheel seat.

Further, a slot hole, a driven wheel sliding plate assembly and a driven wheel pushing assembly are arranged on the driven wheel seat, the driven wheel sliding plate assembly is movably arranged on the slot hole, and the driven wheel pushing assembly is connected with the driven wheel sliding plate assembly; the driven wheel sliding plate assembly comprises a driven wheel sliding plate, a driven wheel pin sleeve, a driven wheel pin shaft, a driven wheel hinge plate and a driven wheel shaft, wherein the abrasive belt driven wheel is arranged on the driven wheel shaft, the driven wheel shaft is vertically arranged on the driven wheel hinge plate, the driven wheel hinge plate is hinged with the driven wheel pin sleeve through the driven wheel pin shaft, and the driven wheel pin sleeve is vertically fixed at the end part of the driven wheel sliding plate.

Further, a positioning convex edge extending into the slotted hole is arranged on the back surface of the driven wheel slide plate, and a sliding sealing plate is fixed on the positioning convex edge and is parallel to the driven wheel slide plate, so that the driven wheel slide plate can stably and smoothly move back and forth along the slotted hole; the sliding sealing plate is provided with an adjusting screw and a hand wheel connected with the adjusting screw, and the adjusting screw penetrates through the sliding sealing plate to be in threaded connection with the driven wheel sliding plate.

Further, the sanding equipment adopts a sand edge structure, an abrasive belt driving wheel and at least two abrasive belt driven wheels are arranged in the abrasive belt sanding assembly, a guide mechanism which is horizontally arranged is arranged on the pressure head support, and the direction of the guide mechanism for guiding the displacement of the vibrating head assembly is vertical to the abrasive belt sleeved outside the two abrasive belt driven wheels.

Further, the sanding equipment adopts a key sanding structure, a plurality of electromagnetic cylinders which are sequentially arranged and distributed and a vibrating head assembly arranged on a telescopic rod of the electromagnetic cylinders are arranged below the pressure head support, and the electromagnetic cylinders are fixed on the pressure head support.

The beneficial effects achieved by adopting the technical proposal of the utility model are that.

The utility model adopts the sand belt sanding assembly and the vibrating head assembly which are mutually matched to be arranged in the sand belt equipment, the sand belt sanding assembly comprises the sand belt driving device, the sand belt driving wheel, the sand belt driven wheel and the sand belt sleeved outside the sand belt driving wheel and the sand belt driven wheel, the sand belt driving device is connected with and drives the sand belt driving wheel, the vibrating head assembly is movably propped against the sand belt, the high-frequency vibration of the vibrating head assembly can drive the sand belt to cling to the surface of a workpiece, and the problem that sand marks are left on the surface of the workpiece and the sanding surface is uneven due to the continuous propping action of the pressing plate in the prior art can be effectively solved.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1.

Fig. 2 is a schematic view of the installation structure of the belt drive device of embodiment 1.

Fig. 3 is a schematic view of the structure of the driven wheel seat in embodiment 1.

Fig. 4 is a schematic view of the structure of adjusting the tightness of the driven wheel seat in embodiment 1.

Fig. 5 is a schematic structural view of a vibrating head assembly according to embodiment 1.

Fig. 6 is a schematic structural diagram of embodiment 2.

Fig. 7 is a schematic structural diagram of embodiment 3.

Fig. 8 is a schematic structural diagram of embodiment 4.

Reference numerals illustrate: 1: frame, 2: a ram beam.

3: abrasive belt sanding assembly, 3-1: abrasive belt driving device, 3-11: abrasive belt driving motor, 3-12: driving pulley, 3-13: driven pulley, 3-14: v-belt, 3-2: abrasive belt driving wheel, 3-3: abrasive belt driven wheel, 3-4: abrasive belt, 3-5: 3-6 parts of abrasive belt supporting wheels, 3-7 parts of abrasive belt driving wheels and 3-7 parts of abrasive belt driven wheels.

4: synchronous belt module, 5: slider seat, 6: cylinder fixing base, 7: cylinder assembly, 8: a piston rod.

9: the vibration head assembly comprises 9-1 parts of a vibration seat, 9-2 parts of a vibration head, 9-3 parts of a vibration lifting guide mechanism, 9-31 parts of a lifting movable plate, 9-32 parts of a guide rod and 9-33 parts of a bearing seat.

10: pressure regulating valve, 11: motor cabinet, 12: bearing plate, 13: driving axle, 14: and a cross beam seat.

15: driven wheel seat, 15-1: slotted hole, 15-2: driven wheel sled assembly, 15-3: driven wheel pushing component, 15-21: 15-211 parts of driven wheel sliding plate, 15-212 parts of sliding sealing plate, 15-213 parts of adjusting screw, 15-22 parts of hand wheel: driven wheel pin bush, 15-23: driven wheel pin roll, 15-24: driven wheel hinge plate, 15-25: driven wheel axle.

16: pressure gauge, 17: guiding mechanism, 18: electromagnetic cylinder, 19: and (5) a sanding roller.

Detailed Description

In the description of the present utility model, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present utility model that the device or element referred to must have a specific azimuth configuration and operation.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features, and in the description of the utility model, "at least" means one or more, unless clearly specifically defined otherwise.

In the present utility model, unless explicitly stated and limited otherwise, the terms "assembled," "connected," and "connected" are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; can be directly connected or connected through an intermediate medium, and can be communicated with the inside of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless specified and limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "below," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply representing the first feature as having a higher level than the second feature. The first feature being "above," "below," and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or simply indicating that the first feature is level below the second feature.

The following description of the specific embodiments of the present utility model is further provided with reference to the accompanying drawings, so that the technical scheme and the beneficial effects of the present utility model are more clear and definite. The embodiments described below are exemplary by referring to the drawings for the purpose of illustrating the utility model and are not to be construed as limiting the utility model.

Example 1.

As shown in fig. 1-5, the present utility model is a vibrating sanding mechanism of a sanding apparatus, in this embodiment, the sanding apparatus is a sand flattening machine, and the vibrating sanding mechanism is mounted on the sand flattening machine. The vibration sanding mechanism comprises a pressure head cross beam 2, an abrasive belt sanding assembly 3, a synchronous belt module 4, a slide block seat 5, an air cylinder fixing seat 6, an air cylinder assembly 7, a vibration head assembly 9 and a pressure regulating valve 10 which are arranged on a frame 1. The frame 1 adopts a triangular sand frame structure, and it is noted that a quadrangular frame structure can be adopted, but the manufacturing cost can be correspondingly increased. The abrasive belt sanding assembly 3 comprises an abrasive belt driving device 3-1, an abrasive belt driving wheel 3-2, an abrasive belt driven wheel 3-3 and an abrasive belt 3-4 sleeved outside the abrasive belt driving wheel 3-2 and the abrasive belt driven wheel 3-3, wherein the abrasive belt driving device 3-1 is connected with the abrasive belt driving wheel 3-2; an abrasive belt supporting wheel 3-5 is arranged between the abrasive belt driving wheel 3-2 and the abrasive belt driven wheel 3-3, the abrasive belt driving wheel 3-2, the abrasive belt supporting wheel 3-5 and the abrasive belt driven wheel 3-3 are distributed in a triangular mode, the abrasive belt supporting wheel 3-5 is arranged on the upper portion of the frame 1, and the abrasive belt driving wheel 3-2 and the abrasive belt driven wheel 3-3 are arranged on two sides of the frame 1. The machine frame 1 is provided with a motor seat 11 and a bearing seat plate 12, the abrasive belt driving device 3-1 comprises an abrasive belt driving motor 3-11, a driving belt pulley 3-12, a driven belt pulley 3-13 and a V-belt 3-14, and the abrasive belt driving motor 3-11 is fixed on the motor seat 11; the V-belt 3-14 is sleeved outside the driving pulley 3-12 and the driven pulley 3-13, the bearing seat plate 12 is provided with a driving wheel shaft 13, and the abrasive belt driving wheel 3-2 and the driven pulley 3-13 are respectively connected and fixed at two ends of the driving wheel shaft 13.

The inner side of the frame 1 is provided with a beam seat 14 corresponding to the pressure head beam, and the pressure head beam 2 is horizontally fixed on the beam seat 14; the outer side of the frame 1 is provided with a driven wheel seat 15, and the abrasive belt driven wheel 3-3 is movably arranged on the driven wheel seat 15. The driven wheel seat 15 is provided with a slotted hole 15-1, a driven wheel slide plate assembly 15-2 and a driven wheel pushing assembly 15-3, the driven wheel slide plate assembly is movably arranged on the slotted hole, and the driven wheel pushing assembly is connected with the driven wheel slide plate assembly; the driven wheel sliding plate assembly 15-2 comprises a driven wheel sliding plate 15-21, a driven wheel pin sleeve 15-22, a driven wheel pin shaft 15-23, a driven wheel hinge plate 15-24 and a driven wheel shaft 15-25, wherein the abrasive belt is arranged on the driven wheel shaft in a driven wheel manner, the driven wheel shaft is vertically arranged on the driven wheel hinge plate, the driven wheel hinge plate is hinged with the driven wheel pin sleeve through the driven wheel pin shaft, and the driven wheel pin sleeve is vertically fixed at the end part of the driven wheel sliding plate. The back of the driven wheel slide plate 15-21 is provided with a positioning convex edge extending into the slotted hole, a sliding sealing plate 15-211 is fixed on the positioning convex edge, and the sliding sealing plate 15-211 is parallel to the driven wheel slide plate 15-21, so that the driven wheel slide plate can stably and smoothly move back and forth along the slotted hole; the sliding sealing plates 15-211 are provided with adjusting screws 15-212 and hand wheels 15-213 connected with the adjusting screws, and the adjusting screws penetrate through the sliding sealing plates and are in threaded connection with the driven wheel sliding plates.

The synchronous belt module 4 is fixed on the pressure head beam 2, the sliding block seat 5 is movably arranged on the synchronous belt module 4, and the synchronous belt module 4 drives the sliding block seat 5 to transversely reciprocate; the pressure head beam 2 is provided with a guide rail seat 2-1, the guide rail seat is provided with a plurality of supporting seats 2-2 along a straight line, and the synchronous belt module is fixedly connected with the guide rail seat 2-1 through the plurality of supporting seats 2-2. The slide block seat is provided with a drag chain plate 5-1 which is horizontally arranged, the drag chain plate 5-1 is provided with a proximity switch seat which extends outwards, and the proximity switch seat is provided with a proximity switch for limiting the reciprocating travel of the slide block seat. The cylinder assembly 7 is vertically arranged on the slide block seat 5 through the cylinder fixing seat 6, a piston rod of the cylinder assembly is fixedly connected with the vibration head assembly 9, and the vibration head assembly 9 is movably propped against the abrasive belt 3-4; the pressure regulating valve 10 is connected with the air cylinder assembly 9, and the output pressure of the air cylinder assembly can be changed by adjusting the pressure regulating valve, so that the pressure of the vibration head assembly pressing the abrasive belt can be adjusted, and the pressure regulating valve is correspondingly connected with the pressure gauge 16 for convenient adjustment, and the pressure value can be read. The vibrating head assembly 9 comprises a vibrating seat 9-1 and a vibrating head 9-2 connected with the vibrating seat, the vibrating seat 9-1 is connected with a vibrating lifting guide mechanism 9-3, the vibrating lifting guide mechanism 9-3 comprises a lifting movable plate 9-31, guide rods 9-32 which are respectively arranged on two sides of the lifting movable plate, bearing seats 9-33 which correspond to the guide rods, the vibrating seat is fixed at the bottom of the lifting movable plate, a piston rod 8 of the cylinder assembly is connected and fixed with the lifting movable plate, the vibrating seat and the vibrating head are driven to be in pressing fit with the abrasive belt through the cylinder assembly, the abrasive belt can be driven to cling to the surface of a workpiece through high-frequency vibration of the vibrating head, sand marks are not left on the surface of the workpiece by the abrasive belt, and the sanding surface is uniform.

Example 2.

As shown in fig. 6, the sanding device adopts a sand edge structure, the sanding belt sanding assembly 3 is provided with a sanding belt driving wheel 3-6 and at least two sanding belt driven wheels 3-7, the pressure head support is provided with a horizontally arranged guiding mechanism 17, and the direction of the guiding mechanism 17 for guiding the displacement of the vibrating head assembly is vertical to the sanding belt sleeved outside the two sanding belt driven wheels.

Example 3.

As shown in fig. 7, the sanding apparatus adopts a key sanding structure, and a plurality of electromagnetic cylinders 18 and vibrating head assemblies are arranged under the ram support, wherein the electromagnetic cylinders 18 are sequentially arranged and distributed, and the vibrating head assemblies are arranged on telescopic rods of the electromagnetic cylinders 18, and the electromagnetic cylinders are fixed on the ram support.

Example 4.

As shown in fig. 8, the sanding apparatus of this embodiment adopts a fixed thickness sanding structure, and a plurality of vibration head assemblies 9 are directly arranged below the pressing head support, and play a role in vibration sanding in cooperation with the operation of the sanding roller 19.

Compared with the prior art, the utility model can effectively solve the problems that sand marks are left on the surface of a workpiece and the sanding surface is uneven due to the continuous jacking action of the pressing plate in the prior art, and has good stability and high processing precision.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present utility model.

Claims (10)

1. The utility model provides a vibration sanding mechanism of sanding equipment, its characterized in that, it includes frame, pressure head support, abrasive band sanding subassembly, vibrating head subassembly, pressure head support and abrasive band sanding subassembly set up respectively in the frame, vibrating head subassembly sets up on the pressure head support, abrasive band sanding subassembly includes abrasive band drive arrangement, abrasive band action wheel, abrasive band follow driving wheel and cover establish the abrasive band outside abrasive band action wheel, abrasive band follow driving wheel, abrasive band drive arrangement connects and drives the abrasive band action wheel, vibrating head subassembly activity roof pressure is on the abrasive band.

2. The vibratory sanding mechanism of a sanding apparatus of claim 1, wherein the sanding apparatus is one of a sander, a selvedge sander, a piano sander, a constant thickness sander.

3. The vibratory sanding mechanism of claim 1, wherein the sanding apparatus is a flat sand structure, the ram support comprises a ram beam, a synchronous belt module, and a slide block seat, the synchronous belt module is fixed on the ram beam, the slide block seat is movably arranged on the synchronous belt module, and the synchronous belt module drives the slide block seat to move back and forth transversely.

4. A vibratory sanding mechanism for a sanding apparatus as defined in claim 3, wherein the shoe base is fixedly provided with a vibratory lifting plate, the vibratory lifting plate is provided with a lifting driving mechanism, the lifting driving mechanism comprises a cylinder fixing seat, a cylinder assembly and a pressure regulating valve, the cylinder fixing seat is fixedly arranged on the vibratory lifting plate, the cylinder assembly is fixedly arranged on the cylinder fixing seat and connected with the driving vibration head assembly, the pressure regulating valve is connected with the cylinder assembly, and the output pressure of the cylinder assembly can be changed and regulated by regulating the pressure regulating valve, so that the pressure of the abrasive belt pressed by the vibration head assembly can be regulated.

5. The vibratory sanding mechanism of a sanding apparatus as defined in claim 4, wherein the vibratory lifting plate has a recess in an upper portion thereof, the cylinder mount including a top plate, a back plate vertically secured to a bottom of the top plate, and left and right side plates connected between the top plate and the back plate; the top plate extends backwards to form a convex edge, the convex edge is matched with the concave position in a concave-convex mode, and the cylinder assembly is fixed on the top plate.

6. The vibratory sanding mechanism of a sanding apparatus of claim 1, wherein the slide block base is provided with a horizontally disposed drag link plate, the drag link plate is provided with an outwardly extending proximity switch base, and the proximity switch base is provided with a proximity switch.

7. The vibratory sanding mechanism of a sanding apparatus of claim 1, wherein the belt drive pulley and the belt driven pulley are provided with belt support wheels therebetween, the belt drive pulley, belt support wheels, and belt driven pulley being triangularly distributed.

8. The vibratory sanding mechanism of a sanding apparatus as defined in claim 1, wherein the frame is provided with a motor mount and a bearing plate, the belt drive means including a belt drive motor, a drive pulley, a driven pulley, a v-belt, the belt drive motor being secured to the motor mount; the V-belt is sleeved outside the driving pulley and the driven pulley, the bearing seat plate is provided with a driving wheel shaft, and the abrasive belt driving wheel and the driven pulley are respectively connected and fixed at two ends of the driving wheel shaft.

9. The vibratory sanding mechanism of a sanding apparatus of claim 1, wherein a guide rail seat is provided on the ram cross beam, the guide rail seat having a plurality of support seats along a straight line, and the timing belt module is fixedly connected to the guide rail seat by the plurality of support seats.

10. The vibratory sanding mechanism of a sanding apparatus as defined in claim 1, wherein a cross beam seat corresponding to the indenter cross beam is provided on the inside of the frame, the indenter cross beam being horizontally secured to the cross beam seat; the outer side of the frame is provided with a driven wheel seat, and the abrasive belt driven wheel is movably arranged on the driven wheel seat; the driven wheel seat is provided with a slot hole, a driven wheel sliding plate assembly and a driven wheel pushing assembly, the driven wheel sliding plate assembly is movably arranged on the slot hole, and the driven wheel pushing assembly is connected with the driven wheel sliding plate assembly; the driven wheel sliding plate assembly comprises a driven wheel sliding plate, a driven wheel pin sleeve, a driven wheel pin shaft, a driven wheel hinge plate and a driven wheel shaft, wherein the abrasive belt driven wheel is arranged on the driven wheel shaft, the driven wheel shaft is vertically arranged on the driven wheel hinge plate, the driven wheel hinge plate is hinged with the driven wheel pin sleeve through the driven wheel pin shaft, and the driven wheel pin sleeve is vertically fixed at the end part of the driven wheel sliding plate; the back of the driven wheel slide plate is provided with a positioning convex edge extending into the slotted hole, and a sliding sealing plate is fixed on the positioning convex edge and parallel to the driven wheel slide plate, so that the driven wheel slide plate can stably and smoothly move back and forth along the slotted hole; the sliding sealing plate is provided with an adjusting screw and a hand wheel connected with the adjusting screw, and the adjusting screw penetrates through the sliding sealing plate to be in threaded connection with the driven wheel sliding plate.