CN219747351U - Bearing ring burnishing device - Google Patents

Abstract

The utility model discloses a bearing ring polishing device, which relates to the technical field of bearing processing and comprises an operation table, wherein a water collecting tank is arranged on the upper surface of the operation table, a supporting plate is fixedly connected with the bottom wall of the water collecting tank, a rotary drum is rotationally connected with the middle part of the supporting plate, a limiting block is fixedly inlaid on the inner wall of the rotary drum, a cross chute is arranged in the middle part of the limiting block, and four supporting claws are slidingly connected in the cross chute, so that the bearing ring is polished. This bearing ring burnishing device can be fixed to the bearing ring suit of multiple diameter value, polishes the outer wall of bearing ring through polishing mechanism simultaneously, can polish the bearing ring of multiple diameter value, improves the device and to the suitability of bearing ring of multiple diameter value, can avoid polishing piece to influence its life because of friction heat accumulation moreover, improves the polishing effect of bearing ring.

Description

Bearing ring burnishing device

Technical Field

The utility model relates to the technical field of bearing machining, in particular to a bearing ring polishing device.

Background

The bearing is a component for fixing and reducing the friction coefficient of load in the mechanical transmission process, and the main function of the bearing is to support the mechanical rotating body and ensure the rotation precision of the mechanical rotating body. The bearing ring is an annular part of a radial rolling bearing with one or more raceways, and after the bearing ring is preliminarily machined, the surface of the bearing ring is provided with a lot of burrs, scrap iron and other impurities, and the surface of the bearing appears as a gray and covered piece, so that the bearing ring needs to be polished and ground.

A bearing ring polishing apparatus disclosed in chinese patent application publication CN 208262437U. The bearing ring body is placed between the two clamping elastic rods through the clamping device, the electric push rod works to push the supporting plate to move downwards, the sliding plate and the clamping elastic rods are driven to move downwards, the clamping elastic rods are extruded and fixed through the inner side of the reinforcing plate, the clamping blocks are extruded and fixed on the bearing ring body, the clamping elastic rods have certain elasticity, deformation is easy to occur during extrusion, and accordingly the fixing effect is better, and loss caused to the surface of the bearing ring body is avoided.

According to the technical scheme, the bearing ring is clamped through the clamping device, then the bearing ring is polished through the polishing device, the bearing ring with one specification type can be clamped only, the bearing ring with various diameter values can not be clamped and polished, the use limitation is large, the diversified production requirements are difficult to meet, in addition, when the bearing ring is polished, the polishing piece can be rapidly heated due to high-speed friction with the bearing ring, the service life of the polishing piece is influenced due to heat accumulation of the polishing piece, and the polishing effect of the bearing ring is also influenced. Thus, a bearing ring polishing device is proposed herein.

Disclosure of Invention

Technical problem to be solved

The utility model aims to make up the defects of the prior art and provides a bearing ring polishing device.

Technical proposal

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a bearing ring burnishing device, includes the operation panel, the water catch bowl has been seted up to the upper surface of operation panel, the diapire fixedly connected with backup pad of water catch bowl, the middle part of backup pad rotates and is connected with the rotary drum, the fixed stopper that inlays of inner wall of rotary drum, the cross spout has been seted up at the middle part of stopper, the inside sliding connection of cross spout has four to prop the claw, and when bearing ring polishes, bearing ring cup joints the right-hand member at four to prop the claw.

The inside of rotary drum is equipped with four expansion pieces, four expansion pieces respectively with the left end fixed connection of four propping claws, four all fixedly connected with pressure spring between the inner wall of a side that expansion piece kept away from each other and pressure spring, through the pressure spring that sets up, can make four expansion pieces move in opposite directions under natural state.

The utility model discloses a compression spring, including the operation panel, the fixed plate is fixed on one side edge fixedly connected with fixed plate, a side fixedly connected with drum that the fixed plate is close to the pressure spring, the axial lead of drum and the axial lead of rotary drum are on same straight line, the inside slip of drum has cup jointed the extrusion post the one end that the extrusion post is close to the expansion piece is boss form, and the position of extrusion post is corresponding with the position of four expansion pieces, the right-hand member slip of extrusion post supports between four expansion pieces, the fixed electric putter that has inlayed in middle part of fixed plate, electric putter's flexible end extends to the inside of drum and with the left end sliding contact of extrusion post.

The polishing device is characterized in that a driving mechanism for enabling the rotary drum to rotate is arranged between the rotary drum and the supporting plate, a polishing mechanism corresponding to the supporting claw is arranged on the bottom wall of the water collecting tank, a cooling assembly is arranged on the operating platform, and the cooling assembly is used for cooling the bearing ring.

In the technical scheme, the bearing sleeve is sleeved at the right ends of the four supporting claws, then the electric push rod is started through the controller, the telescopic end of the electric push rod stretches, the extrusion column is pushed to move rightwards, the right end of the extrusion column extrudes the four expansion blocks, the four expansion blocks can be outwards expanded to move, the four supporting claws are further driven to outwards expand and slide in the cross sliding groove until the right ends of the four supporting claws tightly abut against the inner wall of the bearing ring, and the bearing ring can be fixedly sleeved at the right ends of the four supporting claws.

The supporting claw comprises a supporting strip which is connected inside the cross chute in a sliding mode, one end of the supporting strip is fixedly connected with an arc-shaped plate, and a rubber pad is fixedly arranged on the surface of the arc-shaped plate. In the support claw, through arc and the rubber pad that sets up, when four stay outwards expand, be favorable to making the bearing ring cup joint in the outside of four stay tightly.

The driving mechanism comprises a toothed ring fixedly sleeved on the outer surface of the rotary drum and a driving motor fixedly mounted on the top of the supporting plate, wherein an output shaft of the driving motor is fixedly sleeved with a gear, and the gear is meshed with the toothed ring. In actuating mechanism, drive the gear through starting driving motor and rotate, can make the rotary drum rotate in the inside of backup pad, can make the cover rotate at the bearing ring of the right-hand member of four props claw, then polish the surface of bearing ring through polishing mechanism.

The polishing mechanism comprises a vertical plate fixedly connected to the bottom wall of the water collecting tank, a sliding groove is formed in one side surface of the vertical plate, an L-shaped plate is connected to the inner side of the sliding groove in a sliding mode, a polishing piece is arranged below the supporting claws in an extending mode at the bottom end of the L-shaped plate, polishing of the bearing rings can be achieved when the polishing piece is in contact with the bearing rings sleeved at the right ends of the four supporting claws, a connecting block is fixedly connected to the top of the L-shaped plate, a servo motor is fixedly arranged at the top end of the vertical plate, a threaded rod is fixedly connected to the output end of the servo motor, and the bottom end of the threaded rod is connected to the inside of the connecting block in a threaded mode. In polishing mechanism, start servo motor through the controller and drive the threaded rod and rotate in the linking piece, can make L shaped plate up-and-down motion, can adjust the height of polishing piece to can make polishing piece carry out polishing to the bearing ring of multiple diameter value, improve the device to the suitability of bearing ring of multiple diameter value.

In the polishing mechanism, a group of sliding rods are slidably connected to the bottom end of the L-shaped plate, the top ends of the sliding rods are fixedly connected to the bottom surface of the polishing sheet, and a group of springs are fixedly connected between the bottom surface of the polishing sheet and the bottom end of the L-shaped plate. When the polishing sheet is contacted with the outer surface of the bearing ring, the polishing sheet and the bearing ring can be prevented from being in hard contact through the spring arranged between the polishing sheet and the sliding rod, so that reasonable contact strength between the polishing sheet and the bearing ring is kept, and the polishing effect of the bearing ring is ensured.

The cooling assembly comprises a water pump fixedly mounted on the bottom surface of the operating platform, a guide pipe is fixedly communicated with the output end of the water pump, the top end of the guide pipe penetrates through the bottom wall of the operating platform and extends to the upper side of the operating platform, a spray head is fixedly communicated with the top of the operating platform, and the position of the spray head corresponds to the position of the supporting claw.

In the process of polishing the bearing ring, the water pump is started, high-pressure water flow can be provided for the spray head, and water can be sprayed to the outer surface of the bearing ring through the spray head, so that the cooling effect of the bearing ring and the polishing piece is realized, the service life of the polishing piece is prevented from being influenced by friction accumulated temperature, meanwhile, powder generated by polishing can be washed, and the polishing effect of the bearing ring is improved.

Further, the bottom wall of the operation table is fixedly provided with a water leakage bucket, and the bottom of the water leakage bucket extends to the lower part of the operation table and is fixedly communicated with a drain pipe. Sewage after bearing ring and polishing piece wash can accumulate in the inside of water catch bowl, through the drain bucket and the blow off pipe that set up, is convenient for discharge the sewage in the water catch bowl.

The beneficial effects are that:

compared with the prior art, the bearing ring polishing device has the following beneficial effects:

1. this bearing ring burnishing device is through making electric putter's flexible end extension to promote the extrusion post and move to the right side, make the right-hand member extrusion four expansion blocks of extrusion post, can make four expansion blocks outwards expand the motion, and then drive four and prop the claw and outwards expand the slip in the cross spout, until the right-hand member of four prop claw tightly contradicts with the inner wall of bearing ring, can fix the suit at the right-hand member of four prop claws with the bearing ring, in sum, can realize that the suit is fixed to the bearing ring of multiple diameter value. Then the rotary drum is rotated through the driving mechanism, simultaneously the four supporting claws and the bearing rings sleeved outside the supporting claws are rotated rapidly, and meanwhile the outer walls of the bearing rings are polished through the polishing mechanism, so that the bearing rings with various diameter values can be polished, and the applicability of the device to the bearing rings with various diameter values is improved.

2. The bearing ring polishing device utilizes the set cooling component, namely, through the matching design of the water pump, the guide pipe and the spray head, water can be sprayed to the outer surface of the bearing ring, so that the cooling effect of the bearing ring and the polishing piece is realized, the influence of the polishing piece on the service life of the bearing ring due to friction and accumulated temperature is avoided, meanwhile, the polishing powder generated by polishing can be flushed, and the polishing effect of the bearing ring is improved.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a schematic perspective view of a first view of the present utility model;

FIG. 2 is a cross-sectional view of the internal structure of the drum and cylinder of the present utility model;

FIG. 3 is a schematic view of an explosive structure of the drum, stopper, stay, expansion block and extrusion column of the present utility model;

FIG. 4 is a detailed schematic view of the stopper, pawl and expansion block of the present utility model;

FIG. 5 is a schematic perspective view of a second view of the present utility model;

fig. 6 is a schematic view showing a partial structure of the polishing mechanism in the present utility model.

In the figure:

1. an operation table; 2. a water collection tank; 3. a support plate; 4. a rotating drum; 5. a limiting block; 6. a cross chute;

7. a supporting claw; 71. a stay; 72. an arc-shaped plate; 73. a rubber pad;

8. an expansion block; 9. a pressure spring; 10. a fixing plate; 11. a cylinder; 12. an extrusion column; 13. an electric push rod;

14. a driving mechanism; 141. a toothed ring; 142. a driving motor; 143. a gear;

15. a polishing mechanism; 151. a riser; 152. a chute; 153. an L-shaped plate; 154. polishing piece; 155. a joint block; 156. a servo motor; 157. a threaded rod; 158. a slide bar; 159. a spring;

16. a water pump; 17. a conduit; 18. a spray head; 19. a water leakage bucket; 20. and a blow-down pipe.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 6, the present utility model provides the following technical solutions: the utility model provides a bearing ring burnishing device, includes operation panel 1, and water catch bowl 2 has been seted up to operation panel 1's upper surface, and water catch bowl 2's diapire fixedly connected with backup pad 3, and the middle part of backup pad 3 rotates and is connected with rotary drum 4, and stopper 5 has been inlayed to the inner wall of rotary drum 4 is fixed, and cross spout 6 has been seted up at the middle part of stopper 5, and the inside sliding connection of cross spout 6 has four to prop claw 7, and when bearing ring polishes, bearing ring cup joints the right-hand member at four prop claw 7.

Referring to fig. 1 to 4, four expansion blocks 8 are disposed in the drum 4, the four expansion blocks 8 are fixedly connected with the left ends of the four supporting claws 7 respectively, a side surface of the four expansion blocks 8, which is far away from each other, is fixedly connected with a compression spring 9 with the inner wall of the compression spring 9, and the four expansion blocks 8 can move in opposite directions in a natural state through the compression spring 9.

A fixed plate 10 is fixedly connected to one side edge of the operation table 1, a cylinder 11 is fixedly connected to one side surface of the fixed plate 10, which is close to the pressure spring 9, the axial lead of the cylinder 11 and the axial lead of the rotary cylinder 4 are on the same straight line, an extrusion column 12 is sleeved in the cylinder 11 in a sliding manner, lubricating oil is arranged between the extrusion column 12 and the cylinder 11, one end of the extrusion column 12, which is close to the expansion block 8, is in a boss shape, the position of the extrusion column 12 corresponds to the position of the four expansion blocks 8, the right end of the extrusion column 12 is in sliding abutting joint between the four expansion blocks 8, lubricating oil is arranged between the right end of the extrusion column 12 and the four expansion blocks 8, an electric push rod 13 is fixedly inlaid in the middle of the fixed plate 10, the telescopic end of the electric push rod 13 extends to the inside of the cylinder 11 and is in sliding contact with the left end of the extrusion column 12, and lubricating oil is arranged between the telescopic end of the electric push rod 13 and the extrusion column 12.

Be provided with the actuating mechanism 14 that makes rotary drum 4 pivoted between rotary drum 4 and the backup pad 3, the polishing mechanism 15 corresponding with the claw 7 position is installed to the diapire of water catch bowl 2, is provided with the cooling subassembly on the operation panel 1, and the cooling subassembly is used for cooling down to bearing ring.

In the above technical scheme, first the bearing sleeve is sleeved at the right ends of the four supporting claws 7, then the electric push rod 13 is started through the controller, so that the telescopic end of the electric push rod 13 is extended, the extrusion column 12 is pushed to move rightwards, the right end of the extrusion column 12 extrudes the four expansion blocks 8, the four expansion blocks 8 can be outwards expanded to move, and then the four supporting claws 7 are driven to outwards expand and slide in the cross sliding groove 6 until the right ends of the four supporting claws 7 tightly contact with the inner wall of the bearing ring, and then the bearing ring is fixedly sleeved at the right ends of the four supporting claws 7.

Referring to fig. 3, the stay claw 7 includes a stay 71 slidably connected inside the cross chute 6, one end of the stay 71 is fixedly connected with an arc plate 72, and a rubber pad 73 is fixedly disposed on a surface of the arc plate 72.

In the stay claw 7, by the arc plate 72 and the rubber pad 73 provided, when the four stay bars 71 are expanded outward, it is advantageous to tightly socket the bearing ring on the outside of the four stay bars 71.

Referring to fig. 1, the driving mechanism 14 includes a toothed ring 141 fixedly sleeved on the outer surface of the drum 4 and a driving motor 142 fixedly mounted on the top of the supporting plate 3, wherein an output shaft of the driving motor 142 is fixedly sleeved with a gear 143, and the gear 143 is meshed with the toothed ring 141.

In the driving mechanism 14, the driving motor 142 is started to drive the gear 143 to rotate, so that the rotary drum 4 can rotate in the supporting plate 3, the four supporting claws 7 and the bearing rings sleeved at the right ends of the four supporting claws 7 can rotate, and then the outer surfaces of the bearing rings are polished by the polishing mechanism 15.

Referring to fig. 1 and 5, the polishing mechanism 15 includes a vertical plate 151 fixedly connected to the bottom wall of the water collecting tank 2, a chute 152 is provided on one side of the vertical plate 151, an L-shaped plate 153 is slidably connected to the inside of the chute 152, a polishing sheet 154 is installed below the supporting claws 7 at the bottom end of the L-shaped plate 153, polishing sheets 154 contact with bearing rings sleeved at the right ends of the four supporting claws 7, polishing of the bearing rings can be achieved, a connecting block 155 is fixedly connected to the top of the L-shaped plate 153, a servo motor 156 is fixedly installed at the top of the vertical plate 151, a threaded rod 157 is fixedly connected to the output end of the servo motor 156, and the bottom end of the threaded rod 157 is in threaded connection with the inside of the connecting block 155.

In the polishing mechanism 15, the servo motor 156 is started by the controller to drive the threaded rod 157 to rotate in the connecting block 155, so that the L-shaped plate 153 can move up and down, the height of the polishing sheet 154 can be adjusted, and the polishing sheet 154 and the bearing ring can keep proper contact force, so that the polishing sheet 154 can polish bearing rings with various diameter values, and the applicability of the device to the bearing rings with various diameter values is improved.

Referring to fig. 5 and 6, in the polishing mechanism 15, a set of sliding rods 158 are slidably connected to the bottom end of the L-shaped plate 153, the top end of each sliding rod 158 is fixedly connected to the bottom surface of the polishing sheet 154, and a set of springs 159 are fixedly connected between the bottom surface of the polishing sheet 154 and the bottom end of the L-shaped plate 153.

When the polishing sheet 154 contacts with the outer surface of the bearing ring, the spring 159 arranged between the polishing sheet 154 and the sliding rod 158 can prevent the polishing sheet 154 from making hard contact with the bearing ring, so that reasonable contact force between the polishing sheet 154 and the bearing ring is maintained, and the polishing effect of the bearing ring is ensured.

Referring to fig. 1 and 5, the cooling assembly includes a water pump 16 fixedly mounted on the bottom surface of the console 1, a conduit 17 fixedly connected to the output end of the water pump 16, a nozzle 18 fixedly connected to the top of the console 1 and extending through the bottom wall of the console 1, and a position of the nozzle 18 corresponding to the position of the supporting claw 7.

In the process of polishing the bearing ring, by starting the water pump 16, high-pressure water flow can be provided for the spray head 18, and water can be sprayed to the outer surface of the bearing ring through the spray head 18, so that the cooling effect of the bearing ring and the polishing sheet 154 is realized, the service life of the polishing sheet 154 can be prevented from being influenced by friction accumulated temperature, meanwhile, powder generated by polishing can be washed, and the polishing effect of the bearing ring is improved.

In addition, a drain bucket 19 is fixedly arranged on the bottom wall of the operation table 1, and the bottom of the drain bucket 19 extends to the lower part of the operation table 1 and is fixedly communicated with a drain pipe 20. The sewage after washing the bearing ring and the polishing sheet 154 is accumulated in the water collecting tank 2, and the sewage in the water collecting tank 2 is conveniently discharged through the water leakage bucket 19 and the drain pipe 20.

The working principle is as follows: when the bearing ring polishing device is used, firstly, the bearing sleeve is sleeved at the right ends of the four supporting claws 7, then, the electric push rod 13 is started through the controller, the telescopic end of the electric push rod 13 stretches, the extrusion column 12 is pushed to move rightwards, the right end of the extrusion column 12 extrudes the four expansion blocks 8, the four expansion blocks 8 can be outwards expanded to move, the four supporting claws 7 are further driven to outwards expand and slide in the cross sliding grooves 6 until the right ends of the four supporting claws 7 tightly contact with the inner wall of the bearing ring, and then, the bearing ring can be fixedly sleeved at the right ends of the four supporting claws 7, so that the bearing ring with various diameter values can be sleeved and fixed.

Then, the rotary drum 4 is rotated through the driving mechanism 14, the four supporting claws 7 and the bearing rings sleeved outside the supporting claws can be rotated rapidly, then the outer wall of the bearing ring is polished through the polishing mechanism 15, in the polishing mechanism 15, the servo motor 156 is started through the controller to drive the threaded rod 157 to rotate in the connecting block 155, the L-shaped plate 153 can move up and down, the height of the polishing sheet 154 can be adjusted, and the polishing sheet 154 and the bearing rings can keep proper contact force, so that the polishing sheet 154 can polish and polish the bearing rings with various diameter values, and the applicability of the device to the bearing rings with various diameter values is improved.

The above-mentioned electrical connection relationship between the electric putter 13, the driving motor 142 and the servo motor 156 and the controller may be implemented according to the existing electrical technology, and will not be described in detail in the present utility model.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. Bearing ring burnishing device, including operation panel (1), its characterized in that: the automatic control device is characterized in that a water collecting tank (2) is formed in the upper surface of the operation table (1), a supporting plate (3) is fixedly connected to the bottom wall of the water collecting tank (2), a rotary drum (4) is rotationally connected to the middle of the supporting plate (3), a limiting block (5) is fixedly inlaid on the inner wall of the rotary drum (4), a cross sliding groove (6) is formed in the middle of the limiting block (5), four supporting claws (7) are slidingly connected to the inner part of the cross sliding groove (6), four expanding blocks (8) are arranged in the rotary drum (4), the four expanding blocks (8) are fixedly connected with the left ends of the four supporting claws (7) respectively, and a compression spring (9) is fixedly connected between one side surface, away from each other, of the expanding blocks (8) and the inner wall of the compression spring (9);

a fixing plate (10) is fixedly connected to one side edge of the operating platform (1), a cylinder (11) is fixedly connected to one side surface of the fixing plate (10) close to the pressure spring (9), the axial lead of the cylinder (11) and the axial lead of the rotary cylinder (4) are in the same straight line, an extrusion column (12) is sleeved in the cylinder (11) in a sliding mode, one end of the extrusion column (12) close to the expansion block (8) is in a boss shape, the positions of the extrusion column (12) correspond to the positions of the four expansion blocks (8), an electric push rod (13) is fixedly inlaid in the middle of the fixing plate (10), and the telescopic end of the electric push rod (13) extends to the inside of the cylinder (11) and is in sliding contact with the left end of the extrusion column (12);

the polishing device is characterized in that a driving mechanism (14) for enabling the rotary drum (4) to rotate is arranged between the rotary drum (4) and the supporting plate (3), a polishing mechanism (15) corresponding to the supporting claw (7) in position is arranged on the bottom wall of the water collecting tank (2), and a cooling assembly is arranged on the operating platform (1).

2. A bearing ring polishing apparatus as defined in claim 1, wherein: the cooling assembly comprises a water pump (16) fixedly mounted on the bottom surface of the operation table (1), a guide pipe (17) is fixedly communicated with the output end of the water pump (16), the top end of the guide pipe (17) penetrates through the bottom wall of the operation table (1) and extends to the upper portion of the operation table (1) and is fixedly communicated with a spray head (18), and the position of the spray head (18) corresponds to the position of the supporting claw (7).

3. A bearing ring polishing apparatus as defined in claim 1, wherein: the bottom wall of the operation table (1) is fixedly provided with a water leakage bucket (19), and the bottom of the water leakage bucket (19) extends to the lower part of the operation table (1) and is fixedly communicated with a drain pipe (20).

4. A bearing ring polishing apparatus as defined in claim 1, wherein: the driving mechanism (14) comprises a toothed ring (141) fixedly sleeved on the outer surface of the rotary drum (4) and a driving motor (142) fixedly mounted on the top of the supporting plate (3), a gear (143) is fixedly sleeved on an output shaft of the driving motor (142), and the gear (143) is meshed with the toothed ring (141).

5. A bearing ring polishing apparatus as defined in claim 1, wherein: the supporting claw (7) comprises a supporting bar (71) which is connected inside the cross sliding groove (6) in a sliding mode, one end of the supporting bar (71) is fixedly connected with an arc-shaped plate (72), and a rubber pad (73) is fixedly arranged on the surface of the arc-shaped plate (72).

6. A bearing ring polishing apparatus as defined in claim 1, wherein: polishing mechanism (15) are including riser (151) of fixed connection in water catch bowl (2) diapire, spout (152) have been seted up to one side of riser (151), the inside sliding connection of spout (152) has L shaped plate (153), the bottom of L shaped plate (153) extends to the below of propping claw (7) and installs polishing piece (154), the top fixedly connected with linking piece (155) of L shaped plate (153), the top fixedly connected with servo motor (156) of riser (151), the output fixedly connected with threaded rod (157) of servo motor (156), the bottom threaded connection of threaded rod (157) is in the inside of linking piece (155).

7. The bearing ring polishing apparatus as claimed in claim 6, wherein: the bottom sliding connection of L shaped plate (153) has a set of slide bar (158), every the top of slide bar (158) all fixed connection is in the bottom surface of polishing piece (154), the bottom surface of polishing piece (154) and the bottom of L shaped plate (153) between fixed connection have a set of spring (159).