CN115351658A

CN115351658A - A grinding device for production of valve foundry goods

Info

Publication number: CN115351658A
Application number: CN202211075548.3A
Authority: CN
Inventors: 朱健力
Original assignee: Anhui Ningxing Casting Co ltd
Current assignee: Anhui Ningxing Casting Co ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2022-11-18

Abstract

The invention relates to the technical field of polishing devices and discloses a polishing device for valve casting production. This a grinding device for valve foundry goods production, it slides to the inboard to drive fixed frame through the mounting panel, make contact block and valve foundry goods contact, continue to slide to the inboard afterwards, make contact block pass through the connecting rod pressure and move the sliding block, make the sliding block slide in the outside of gag lever post, make sliding block compression fixed spring simultaneously, the elasticity through fixed spring presss from both sides the valve foundry goods tight simultaneously, cooperate through the multiunit contact block, press from both sides its fixed clamp according to the different positions on the valve foundry goods, thereby reached and be convenient for with the fixed centre gripping of anomalous valve foundry goods.

Description

A grinding device for production of valve foundry goods

Technical Field

The invention relates to the technical field of polishing devices, in particular to a polishing device for valve casting production.

Background

The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. The valve is usually formed by casting, and after the valve casting is finished, the surface of the valve casting needs to be polished so as to ensure the smoothness of the surface of the valve casting.

In the prior art, when a grinding device for valve casting production is used for clamping a valve casting, due to the fact that the valve casting is irregular in appearance structure, the valve casting is inconvenient to clamp effectively when the valve casting is clamped, and the grinding wheel is inconvenient to replace quickly in the using process of the grinding device for valve casting production, so that the problem needs to be solved.

Disclosure of Invention

The invention aims to provide a grinding device for valve casting production, which solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a grinding device for production of valve foundry goods, includes the workstation, the bottom fixed mounting of workstation has the supporting leg, the outside of workstation is provided with fixed fixture, the top of workstation is provided with slide adjusting mechanism, slide adjusting mechanism's outside is provided with rotates grinding mechanism.

Fixed fixture includes the spacing groove, the bottom at the workstation is seted up to the spacing groove, the inside fixed mounting of spacing groove has first motor, the output fixed mounting of first motor has first screw rod, the carriage is installed to the outside screw thread of first screw rod, the inboard fixed mounting in bottom of carriage has the stopper, the top fixed mounting of carriage has the mounting panel, the inboard fixed mounting of mounting panel has fixed frame, the inside slidable mounting of fixed frame has the sliding block, the inboard fixed mounting of sliding block has the connecting rod, the one end fixed mounting that the sliding block was kept away from to the connecting rod has the contact piece, the inside fixed mounting of fixed frame has the gag lever post, the outside fixed mounting of sliding block has fixed spring.

Preferably, the carriage is provided with two sets ofly, just stopper slidable mounting is in the spacing groove, the bottom fixed mounting of workstation has the fixed body, just the one end that first motor was kept away from to first screw rod rotates the right side of installing at the fixed body, is convenient for make first screw rod support rotate.

Preferably, the through-hole has been seted up with the corresponding position department of gag lever post to the sliding block, just the gag lever post passes the through-hole, the through-hole has been seted up with the corresponding position department of connecting rod to the inboard of fixed frame, just the connecting rod passes the through-hole, is convenient for make the connecting rod pass fixed frame and carry out spacing slip.

Preferably, the contact blocks are arranged to be thirty-four, the mounting plates are arranged to be two, and the inner sides of the mounting plates are respectively provided with seventeen contact blocks, so that the contact blocks can fix and clamp the valve casting conveniently.

Preferably, the slide adjusting mechanism includes first spout, the top at the workstation is seted up to first spout, the inside slidable mounting of first spout has the sliding stand, the right side fixed mounting of workstation has the fixing base, the top fixed mounting of fixing base has the second motor, the output end fixed mounting of second motor has the second screw rod, the one end that the second motor was kept away from to the second screw rod is provided with rotates the seat, just rotate seat fixed mounting on the left side inner wall of first spout, be convenient for make the second screw rod support the rotation.

Preferably, a threaded hole is formed in the sliding table at a position corresponding to the second screw, and the second screw is installed in the threaded hole in a threaded manner, so that the second screw drives the sliding table to slide.

Preferably, the top fixed mounting of sliding stand has the support frame, the second spout has been seted up in the front of support frame, the inside slidable mounting of second spout has the lifing arm, the top fixed mounting of support frame has the mount pad, the positive fixed mounting of mount pad has the third motor, the output fixed mounting of third motor has the third screw rod, just the one end that the third motor was kept away from to the third screw rod rotates the top of installing at the sliding stand, the lifing arm is seted up threaded hole with the corresponding position department of third screw rod, just third screw rod screw thread is installed in the screw hole, is convenient for make the third screw rod drive the lifing arm and carry out the lift adjustment.

Preferably, the rotary polishing mechanism comprises an installation frame, the installation frame is arranged at the bottom of the lifting arm, the top of the installation frame is fixedly provided with two connectors, the connectors are arranged in opposite directions, fixing bolts are arranged between the connectors and the lifting arm, through holes are formed in the corresponding positions of the connectors and the lifting arm and the fixing bolts, and the fixing bolts penetrate through the through holes, so that the installation frame is fixedly arranged at the bottom of the lifting arm.

Preferably, the inboard fixed mounting in bottom of installing frame has the fourth motor, the output fixed mounting of fourth motor has first gear, the left side meshing of first gear has the second gear, the intermediate position fixed mounting of second gear has the axis of rotation, the through-hole has been seted up with the corresponding position department of axis of rotation in the bottom of installing frame, just the axis of rotation passes the through-hole, the bottom fixed mounting of axis of rotation has the rolling disc, the bottom of rolling disc is provided with the wheel of polishing, be provided with mounting bolt between wheel of polishing and the rolling disc, be convenient for make the wheel of polishing fixed mounting in the bottom of rolling disc.

Preferably, the bottom of the rotating disc is provided with an insertion groove, the top of the polishing wheel is fixedly provided with an insertion block, the insertion block is inserted into the insertion groove, a through hole is formed in a position corresponding to the rotating disc and the mounting bolt, a threaded hole is formed in a position corresponding to the polishing wheel and the mounting bolt, and the mounting bolt penetrates through the through hole and is installed in the threaded hole in a threaded mode, so that the polishing wheel is conveniently located and installed at the bottom of the rotating disc.

Compared with the prior art, the invention provides a polishing device for valve casting production, which has the following beneficial effects:

1. this a grinding device for valve casting production, through placing the valve casting on the workstation, drive first screw rod through first motor afterwards and rotate, make first screw rod drive the carriage and slide to the inboard, make the carriage drive the stopper spacing slip in the spacing groove simultaneously, drive the mounting panel through the carriage and slide to the inboard, make the mounting panel drive fixed frame and slide to the inboard, make contact block and valve casting contact, continue to slide to the inboard afterwards, make contact block pass through the connecting rod and press the sliding block, make the sliding block slide in the outside of gag lever post, make the sliding block compression fixed spring simultaneously, it presss from both sides tightly the valve casting to press from both sides through fixed spring's elasticity simultaneously, cooperate through multiunit contact block, it is fixed tight according to the different positions on the valve casting, thereby reached and be convenient for with the fixed centre gripping of anomalous valve casting.

2. This a grinding device for valve casting production, third motor through the setting drives the third screw rod and rotates, make the third screw rod drive the lifing arm and slide downwards in the second spout, make the lifing arm drive the installing frame and slide downwards, until polishing wheel and valve casting surface contact, and rotate through the polishing wheel and polish valve casting surface, drive the second screw rod through the second motor simultaneously and rotate, make the second screw rod drive the sliding platform spacing slip in first spout, make the sliding platform drive the lifing arm and slide, thereby make the face of the valve casting of polishing wheel pair bottom of lifing arm drive slide and polish, thereby reached and carried out the effect of polishing to the valve casting.

3. This a grinding device for valve casting production, drive first gear through the fourth motor and rotate, make first gear drive the axis of rotation through the second gear and rotate, make the axis of rotation drive the wheel of polishing through the rolling disc and rotate, thereby make the wheel of polishing rotate the valve casting of polishing, when changing the wheel of polishing, through taking out mounting bolt, the wheel of polishing will be taken out from the rolling disc afterwards, insert the inserting groove of rolling disc bottom with the grafting piece at new wheel of polishing top afterwards, it can to twist mounting bolt again, thereby reached and be convenient for carry out quick replacement's effect to the wheel of polishing.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor:

FIG. 1 is a schematic view of the external structure of the present invention;

FIG. 2 is a schematic bottom view of the present invention;

FIG. 3 is an external view of the fixing and clamping mechanism of the present invention;

FIG. 4 is a schematic sectional view of the bottom view of the fixed frame of the present invention;

FIG. 5 is a schematic view of the sliding adjustment mechanism of the present invention;

FIG. 6 is a schematic cross-sectional view of a rotary grinding mechanism of the present invention;

FIG. 7 is an exploded view of the rotary grinding mechanism of the present invention.

In the figure: 1. a work table; 2. supporting legs; 3. fixing the clamping mechanism; 31. a limiting groove; 32. a first motor; 33. a first screw; 34. a carriage; 35. a limiting block; 36. mounting a plate; 37. a fixing frame; 38. a slider; 39. a connecting rod; 310. a contact block; 311. a limiting rod; 312. fixing the spring; 4. a slide adjustment mechanism; 41. a first chute; 42. a fixed seat; 43. a second motor; 44. a second screw; 45. a rotating seat; 46. a sliding table; 47. a support frame; 48. a mounting seat; 49. a third motor; 410. a third screw; 411. a lifting arm; 412. a second chute; 5. rotating the polishing mechanism; 51. installing a frame; 52. a linker; 53. fixing the bolt; 54. a fourth motor; 55. a first gear; 56. a second gear; 57. a rotating shaft; 58. rotating the disc; 59. grinding the wheel; 510. and (6) installing a bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows:

referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a grinding device for production of valve foundry goods, includes workstation 1, and the bottom fixed mounting of workstation 1 has supporting leg 2, and the outside of workstation 1 is provided with fixed fixture 3, and the top of workstation 1 is provided with slide adjusting mechanism 4, and slide adjusting mechanism 4's outside is provided with rotates grinding machanism 5.

Fixed fixture 3 includes spacing groove 31, the bottom at workstation 1 is seted up to spacing groove 31, the inside fixed mounting of spacing groove 31 has first motor 32, the output end fixed mounting of first motor 32 has first screw rod 33, carriage 34 is installed to the outside screw thread of first screw rod 33, the inboard fixed mounting in bottom of carriage 34 has stopper 35, the top fixed mounting of carriage 34 has mounting panel 36, the inboard fixed mounting of mounting panel 36 has fixed frame 37, the inside slidable mounting of fixed frame 37 has sliding block 38, the inboard fixed mounting of sliding block 38 has connecting rod 39, the one end fixed mounting that sliding block 38 was kept away from to connecting rod 39 has contact piece 310, the inside fixed mounting of fixed frame 37 has gag lever post 311, the outside fixed mounting of sliding block 38 has fixed spring 312.

Further, the sliding frame 34 is provided with two sets, the limiting block 35 is slidably mounted in the limiting groove 31, the fixing body is fixedly mounted at the bottom of the workbench 1, and one end of the first screw 33, which is far away from the first motor 32, is rotatably mounted at the right side of the fixing body, so that the first screw 33 can be supported and rotated conveniently.

Furthermore, a through hole is formed in a position corresponding to the sliding block 38 and the limiting rod 311, the limiting rod 311 penetrates through the through hole, a through hole is formed in a position corresponding to the connecting rod 39 on the inner side of the fixing frame 37, and the connecting rod 39 penetrates through the through hole, so that the connecting rod 39 can penetrate through the fixing frame 37 to perform limiting sliding.

Further, the contact blocks 310 are arranged to be thirty-four, the mounting plates 36 are arranged to be two, and seventeen contact blocks 310 are arranged on the inner sides of the two mounting plates 36 respectively, so that the contact blocks 310 can fix and clamp the valve castings conveniently.

Example two:

referring to fig. 5, in combination with the first embodiment, further, the sliding adjustment mechanism 4 includes a first sliding chute 41, the first sliding chute 41 is disposed at the top of the workbench 1, a sliding table 46 is slidably mounted inside the first sliding chute 41, a fixed seat 42 is fixedly mounted on the right side of the workbench 1, a second motor 43 is fixedly mounted at the top of the fixed seat 42, a second screw 44 is fixedly mounted at an output end of the second motor 43, a rotating seat 45 is disposed at one end of the second screw 44 far away from the second motor 43, and the rotating seat 45 is fixedly mounted on the inner wall of the left side of the first sliding chute 41, so that the second screw 44 is supported and rotated.

Furthermore, a threaded hole is formed in a position of the sliding table 46 corresponding to the second screw 44, and the second screw 44 is threadedly mounted in the threaded hole, so that the sliding table 46 is driven by the second screw 44 to slide.

Further, a support frame 47 is fixedly mounted at the top of the sliding table 46, a second sliding groove 412 is formed in the front face of the support frame 47, a lifting arm 411 is arranged in the second sliding groove 412, a mounting seat 48 is fixedly mounted at the top of the support frame 47, a third motor 49 is fixedly mounted on the front face of the mounting seat 48, a third screw 410 is fixedly mounted at the output end of the third motor 49, one end, far away from the third motor 49, of the third screw 410 is rotatably mounted at the top of the sliding table 46, a threaded hole is formed in the corresponding position of the lifting arm 411 and the third screw 410, and the third screw 410 is threadedly mounted in the threaded hole, so that the third screw 410 drives the lifting arm 411 to perform lifting adjustment.

Example three:

referring to fig. 6 and fig. 7, in combination with the first embodiment and the second embodiment, it is further obtained that the rotary polishing mechanism 5 includes an installation frame 51, the installation frame 51 is disposed at the bottom of the lifting arm 411, a connecting body 52 is fixedly installed at the top of the installation frame 51, two connecting bodies 52 are disposed, the installation directions of the two connecting bodies 52 are opposite, a fixing bolt 53 is disposed between the connecting body 52 and the lifting arm 411, through holes are disposed at corresponding positions of the connecting body 52, the lifting arm 411 and the fixing bolt 53, and the fixing bolt 53 penetrates through the through holes, so that the installation frame 51 is fixedly installed at the bottom of the lifting arm 411.

Further, a fourth motor 54 is fixedly mounted on the inner side of the bottom of the mounting frame 51, a first gear 55 is fixedly mounted at the output end of the fourth motor 54, a second gear 56 is meshed with the left side of the first gear 55, a rotating shaft 57 is fixedly mounted in the middle of the second gear 56, a through hole is formed in the bottom of the mounting frame 51 and corresponds to the rotating shaft 57, the rotating shaft 57 penetrates through the through hole, a rotating disc 58 is fixedly mounted at the bottom of the rotating shaft 57, a polishing wheel 59 is arranged at the bottom of the rotating disc 58, and a mounting bolt 510 is arranged between the polishing wheel 59 and the rotating disc 58, so that the polishing wheel 59 is fixedly mounted at the bottom of the rotating disc 58.

Furthermore, an insertion groove is formed in the bottom of the rotating disc 58, an insertion block is fixedly mounted at the top of the polishing wheel 59 and is inserted into the insertion groove, a through hole is formed in a position, corresponding to the mounting bolt 510, of the rotating disc 58, a threaded hole is formed in a position, corresponding to the mounting bolt 510, of the polishing wheel 59, and the mounting bolt 510 penetrates through the through hole and is installed in the threaded hole in a threaded mode, so that the polishing wheel 59 can be conveniently located and installed at the bottom of the rotating disc 58.

In the actual operation process, when the device is used, the valve casting is placed on the workbench 1, then the first screw 33 is driven by the first motor 32 to rotate, the first screw 33 drives the sliding frame 34 to slide inwards, the sliding frame 34 drives the limiting block 35 to slide in the limiting groove 31 in a limiting way, the mounting plate 36 is driven by the sliding frame 34 to slide inwards, the mounting plate 36 drives the fixing frame 37 to slide inwards, the contact block 310 is in contact with the valve casting, then the sliding block is continuously slid inwards, the contact block 310 presses the sliding block 38 through the connecting rod 39, the sliding block 38 slides outside the limiting rod 311, the sliding block 38 compresses the fixing spring 312, the valve casting is clamped through the elasticity of the fixing spring 312, and the valve casting is fixedly clamped according to different positions on the valve casting through the cooperation of a plurality of groups of contact blocks 310, so that the irregular valve casting is fixedly clamped;

the third motor 49 is arranged to drive the third screw 410 to rotate, so that the third screw 410 drives the lifting arm 411 to slide downwards in the second sliding groove 412, the lifting arm 411 drives the mounting frame 51 to slide downwards until the polishing wheel 59 is contacted with the surface of the valve casting, the surface of the valve casting is polished by rotating the polishing wheel 59, meanwhile, the second motor 43 drives the second screw 44 to rotate, the second screw 44 drives the sliding table 46 to slide in the first sliding groove 41 in a limiting manner, the sliding table 46 drives the lifting arm 411 to slide, and the lifting arm 411 drives the bottom polishing wheel 59 to polish the surface of the valve casting in a sliding manner, so that the effect of polishing the valve casting is achieved;

drive first gear 55 through fourth motor 54 and rotate, make first gear 55 drive axis of rotation 57 through second gear 56 and rotate, make axis of rotation 57 drive grinding wheel 59 through rolling disc 58 and rotate, thereby make grinding wheel 59 rotate the valve casting of polishing, when changing grinding wheel 59, through taking out mounting bolt 510, will grind wheel 59 and take out from rolling disc 58 afterwards, insert the inserting groove of rolling disc 58 bottom with the plug-in block at new grinding wheel 59 top afterwards, it can to twist mounting bolt 510 again, thereby reached and be convenient for carry out quick replacement's effect to grinding wheel 59.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. The utility model provides a grinding device for production of valve foundry goods, includes workstation (1), its characterized in that: the bottom of the workbench (1) is fixedly provided with a supporting leg (2), the outside of the workbench (1) is provided with a fixed clamping mechanism (3), the top of the workbench (1) is provided with a sliding adjusting mechanism (4), and the outside of the sliding adjusting mechanism (4) is provided with a rotating polishing mechanism (5);

fixed fixture (3) include spacing groove (31), the bottom in workstation (1) is seted up in spacing groove (31), the inside fixed mounting of spacing groove (31) has first motor (32), the output fixed mounting of first motor (32) has first screw rod (33), carriage (34) are installed to the outside screw thread of first screw rod (33), the inboard fixed mounting in bottom of carriage (34) has stopper (35), the top fixed mounting of carriage (34) has mounting panel (36), the inboard fixed mounting of mounting panel (36) has fixed frame (37), the inside slidable mounting of fixed frame (37) has sliding block (38), the inboard fixed mounting of sliding block (38) has connecting rod (39), the one end fixed mounting that sliding block (38) were kept away from in connecting rod (39) has contact piece (310), the inside fixed mounting of fixed frame (37) has gag lever post (311), the outside fixed mounting of sliding block (38) has fixed spring (312).

2. A grinding apparatus for use in the production of valve castings according to claim 1, wherein: carriage (34) are provided with two sets ofly, just stopper (35) slidable mounting is in spacing groove (31), the bottom fixed mounting of workstation (1) has the fixed body, just the one end rotation of keeping away from first motor (32) in first screw rod (33) is installed on the right side of fixed body.

3. A grinding apparatus for use in the production of valve castings according to claim 1, wherein: the through-hole has been seted up with the corresponding position department of gag lever post (311) in sliding block (38), just gag lever post (311) passes the through-hole, the through-hole has been seted up with the corresponding position department of connecting rod (39) to the inboard of fixed frame (37), just connecting rod (39) pass the through-hole.

4. A grinding apparatus for use in the production of valve castings according to claim 1, further comprising: the contact blocks (310) are arranged in thirty-four directions, the mounting plates (36) are arranged in two directions, and the inner sides of the mounting plates (36) are respectively provided with seventeen contact blocks (310).

5. A grinding apparatus for use in the production of valve castings according to claim 1, wherein: slide adjusting mechanism (4) include first spout (41), the top at workstation (1) is seted up in first spout (41), the inside slidable mounting of first spout (41) has sliding stand (46), the right side fixed mounting of workstation (1) has fixing base (42), the top fixed mounting of fixing base (42) has second motor (43), the output fixed mounting of second motor (43) has second screw rod (44), the one end that second motor (43) were kept away from in second screw rod (44) is provided with rotates seat (45), just rotate seat (45) fixed mounting on the left side inner wall of first spout (41).

6. A grinding apparatus for use in the production of valve castings according to claim 5, wherein: threaded holes are formed in the positions, corresponding to the second screw rods (44), of the sliding table (46), and the second screw rods (44) are installed in the threaded holes in a threaded mode.

7. A grinding apparatus for use in the production of valve castings according to claim 5, wherein: the top fixed mounting of sliding stand (46) has support frame (47), second spout (412) have been seted up in the front of support frame (47), the inside slidable mounting of second spout (412) has lifing arm (411), the top fixed mounting of support frame (47) has mount pad (48), the positive fixed mounting of mount pad (48) has third motor (49), the output fixed mounting of third motor (49) has third screw rod (410), just the one end that third motor (49) were kept away from in third screw rod (410) rotates the top of installing at sliding stand (46), lifing arm (411) and the corresponding position department of third screw rod (410) have seted up the screw hole, just third screw rod (410) screw thread is installed in the screw hole.

8. A grinding apparatus for use in the production of valve castings according to claim 7, wherein: rotating grinding machanism (5) including installing frame (51), installing frame (51) set up the bottom at lifing arm (411), the top fixed mounting of installing frame (51) has connector (52), connector (52) are provided with two, and two the installation opposite direction of connector (52), be provided with fixing bolt (53) between connector (52) and lifing arm (411), through-hole has been seted up with fixing bolt (53) to connector (52) and lifing arm (411) corresponding position department, just fixing bolt (53) pass the through-hole.

9. A grinding apparatus for use in the production of valve castings according to claim 8, further comprising: the utility model discloses a polishing machine, including installing frame (51), rotation axis (57), the inboard fixed mounting in bottom of installing frame (51) has fourth motor (54), the output fixed mounting of fourth motor (54) has first gear (55), the left side meshing of first gear (55) has second gear (56), the intermediate position fixed mounting of second gear (56) has axis of rotation (57), the through-hole has been seted up with the corresponding position department of axis of rotation (57) in the bottom of installing frame (51), just axis of rotation (57) pass the through-hole, the bottom fixed mounting of axis of rotation (57) has rolling disc (58), the bottom of rolling disc (58) is provided with polishing wheel (59), be provided with between polishing wheel (59) and rolling disc (58) construction bolt (510).

10. A grinding apparatus for use in the production of valve castings according to claim 9, further comprising: the bottom of the rotating disc (58) is provided with an insertion groove, the top of the polishing wheel (59) is fixedly provided with an insertion block, the insertion block is inserted into the insertion groove, a through hole is formed in the position, corresponding to the mounting bolt (510), of the rotating disc (58), a threaded hole is formed in the position, corresponding to the mounting bolt (510), of the polishing wheel (59), and the mounting bolt (510) penetrates through the through hole and is installed in the threaded hole in a threaded mode.