Glass sleeve grinding tool

Abstract

The invention discloses a glass sleeve grinding tool and relates to the technical field of glass sleeve machining equipment.The glass sleeve grinding tool comprises a base, a clamping tool and a grinding piece, a main shaft is rotationally arranged on the base, a motor used for driving the main shaft to rotate is arranged on the base, and a fixing structure used for fixing the clamping tool is arranged on the main shaft; the clamping tool is used for clamping and fixing a glass sleeve, a mounting frame is fixedly arranged on the base, an adjusting frame is slidably arranged on the mounting frame in the direction close to or away from the base, a limiting piece used for preventing the adjusting frame from sliding is arranged on the mounting frame, and a connecting frame is slidably arranged on the adjusting frame in the axial direction of the main shaft. The adjusting frame is provided with a driving piece used for driving the connecting frame to slide, the connecting frame is provided with a connecting assembly used for being connected with a grinding piece, and the grinding piece is used for grinding the surface of the glass sleeve. According to the grinding device, the outer surface and the inner surface of the glass sleeve can be efficiently and stably ground.

Description

Technical Field

[0001] The present application relates to the technical field of glass sleeve processing equipment, and in particular to a glass sleeve grinding tool. Background Art

[0002] Glass sleeves are widely used in the precision manufacturing industry, especially in the fields of optical instruments, medical equipment, etc. In order to ensure the quality and performance of the product, the surface quality of the glass sleeve is crucial. In recent years, with the advancement of science and technology and the growth of market demand, the application scope of glass sleeves has been continuously expanded, and the requirements for their surface treatment have also been increasing. High-quality surface treatment can not only enhance the appearance of the product, but also extend its service life and reduce the failure rate, thereby improving overall production efficiency and market competitiveness.

[0003] At present, in the processing of glass sleeves, common surface treatment methods mainly include manual grinding and mechanical grinding. However, traditional mechanical grinding equipment mainly focuses on the treatment of the outer surface of the glass sleeve, and the grinding of the inner surface of the glass sleeve is often done by manual grinding. Although manual grinding is highly flexible, it has problems such as high labor intensity and poor product consistency, which affects the quality of the product. Therefore, how to design a tool that can simultaneously take into account the efficient grinding of the inner and outer surfaces of the glass sleeve has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the problems existing in the prior art, the present application provides a glass sleeve grinding tool.

[0005] The present application provides a glass sleeve grinding tool, which adopts the following technical solution: A glass sleeve grinding tool comprises a base, a clamping tool and a grinding piece, wherein a main shaft is rotatably arranged on the base, a motor for driving the main shaft to rotate is arranged on the base, a fixing structure for fixing the clamping tool is arranged on the main shaft, the clamping tool is used to clamp and fix the glass sleeve, a mounting frame is fixedly arranged on the base, an adjusting frame is slidably arranged on the mounting frame along a direction approaching or moving away from the base, a limiting piece is arranged on the mounting frame for preventing the adjusting frame from sliding, a connecting frame is slidably arranged on the adjusting frame along the axial direction of the main shaft, a driving piece is arranged on the adjusting frame for driving the connecting frame to slide, a connecting assembly for connecting the grinding piece is arranged on the connecting frame, and the grinding piece is used to grind the surface of the glass sleeve.

[0006] Optionally, the clamping tool includes a first fixed frame and a clamping plate, the fixing structure is used to fix the first fixed frame on the main shaft, the first fixed frame is adapted to the interior of the glass sleeve and is used to be inserted into the glass sleeve, a positioning plate is fixedly provided at the end of the first fixed frame, the clamping plate is fixed to the end on the other side of the first fixed frame by bolts, and the positioning plate and the clamping plate are used to clamp the two ends of the glass sleeve, and the grinding piece is used to grind the outer surface of the glass sleeve.

[0007] Optionally, the fixing structure includes a mounting sleeve coaxially fixedly arranged on the main shaft, the mounting sleeve is adapted to the positioning plate and is used to be sleeved on the positioning plate, and the positioning plate is fixed in the mounting sleeve by bolts.

[0008] Optionally, the grinding piece is arc-shaped, and the inner side wall of the grinding piece is provided with a grinding surface, and the grinding surface is matched with the outer side wall of the glass sleeve.

[0009] Optionally, the clamping tool includes a second fixed frame and a clamping ring, the fixing structure is used to fix the second fixed frame on the main shaft, the interior of the second fixed frame is provided with a placement groove adapted to the glass sleeve, the clamping ring is fixed to the end of the second fixed frame by bolts, and is used to press and fix the glass sleeve in the placement groove of the second fixed frame, and the grinding piece is used to grind the inner surface of the glass sleeve.

[0010] Optionally, the fixing structure includes fixing bolts, and an end plate is fixed to the end of the second fixing frame by bolts. A mounting groove is provided on the end plate, which is adapted to the main shaft and is used for the main shaft to be inserted. The fixing bolts are used to fix the end plate to the main shaft.

[0011] Optionally, a positioning plate is sleeved and fixed on the main shaft, a plurality of positioning blocks are fixedly provided on one end of the positioning plate close to the end plate, a plurality of positioning grooves are opened on one end of the end plate close to the positioning plate, the positioning blocks correspond to the positioning grooves one by one and are used to be inserted into the corresponding positioning grooves.

[0012] Optionally, the grinding piece is arc-shaped, and an outer side wall of the grinding piece is provided with a grinding surface, and the grinding surface is matched with the inner side wall of the glass sleeve.

[0013] Optionally, the connecting assembly includes a connecting sleeve and a mounting rod, the connecting sleeve is fixed on a connecting frame, both ends of the connecting sleeve are provided with plug-in grooves adapted to the mounting rod, the mounting rod is used to be inserted into the plug-in groove of the connecting sleeve and have an interference fit with the connecting sleeve, and the grinding part is installed on the mounting rod.

[0014] Optionally, a connecting rod is fixedly provided on the mounting rod, a spherical body is fixedly provided on the end of the connecting rod, a spherical groove matching the spherical body is provided on the grinding piece, and when the grinding surface is provided on the inner wall of the grinding piece, the spherical groove is provided on the outer wall of the grinding piece, and when the grinding surface is provided on the outer wall of the grinding piece, the spherical groove is provided on the inner wall of the grinding piece, an elastic limit strip is passed through the spherical groove, and a limit groove for placing the elastic limit strip is provided on the grinding piece.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application can realize efficient and stable grinding of the outer and inner surfaces of the glass sleeve. Specifically, the clamping fixture is fixed on the main shaft, and then the glass sleeve is clamped and fixed on the clamping fixture, and the grinding piece is connected to the connecting frame through the connecting assembly. When the outer surface of the glass sleeve needs to be ground, the adjustment frame is driven to slide, the position of the connecting frame is adjusted, and the grinding piece is abutted against the outer surface of the glass sleeve; then, the main shaft is driven to rotate by the motor, driving the glass sleeve to rotate, and at the same time, the connecting frame is driven to slide along the axial direction of the main shaft by the driving member, driving the grinding piece to slide along the axial direction of the glass sleeve on the surface of the glass sleeve, so as to realize the grinding of the outer surface of the glass sleeve. When the inner surface of the glass sleeve needs to be ground, the position of the adjusting frame is readjusted, and the grinding piece is allowed to enter the glass sleeve and abut against the inner surface of the glass sleeve. After that, the motor drives the glass sleeve to rotate, and the driving member drives the grinding piece to slide along the axial direction of the glass sleeve in the glass sleeve, so as to realize the grinding of the inner surface of the glass sleeve.

[0016] 2. The present application provides a connecting rod on the mounting rod, a spherical body at the end of the connecting rod, and a spherical groove on the grinding piece that matches the spherical body, so that the grinding piece can flexibly adjust the angle, so that the grinding piece of the grinding piece can better fit the inner surface or outer surface of the glass sleeve. At the same time, the elastic limit strip is provided to further improve the stability of the grinding piece, prevent the grinding piece from deflecting or falling off during the grinding process, and ensure the grinding quality of the inner surface or outer surface of the glass sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 This is a schematic diagram of the structure of the clamping tool used in Example 1 of the present application; Figure 3 This is a cross-sectional view of the structure of the clamping tool used to express the embodiment 1 of the present application; Figure 4 This is a schematic diagram of the structure of the connection component used in Example 1 of the present application; Figure 5 yes Figure 4A magnified view of part A; Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present application; Figure 7 This is a schematic diagram of the structure of the clamping tool used in Example 2 of the present application; Figure 8 This is a cross-sectional view of the structure of the clamping tool used to express the second embodiment of the present application; Fig. 9 This is a schematic diagram of the structure of the connection component used in Example 2 of the present application; Fig.10 yes Fig. 9 Magnified view of section B.

[0018] Explanation of the accompanying drawings: 1. base; 11. support frame; 12. motor; 13. mounting frame; 14. adjustment frame; 15. limit screw; 16. handle; 17. rodless cylinder; 2. clamping tool; 21. first fixed frame; 211. positioning plate; 22. clamping plate; 23. rubber gasket; 24. second fixed frame; 241. end plate; 242. positioning groove; 25. clamping ring; 3. grinding part; 31. spherical groove; 32. limit groove; 4. main shaft; 41. mounting sleeve; 42. positioning plate; 421. positioning block; 43. fixing bolt; 5. connecting frame; 51. connecting sleeve; 511. plug-in slot; 52. mounting rod; 53. connecting rod; 531. sphere; 532. elastic limit strip. DETAILED DESCRIPTION

[0019] The following will be combined with the attached Figure 1 -Attached Fig.10 , the technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0020] The inventor of the present application found that the traditional mechanical grinding equipment mainly focuses on the processing of the outer surface of the glass sleeve, and the grinding of the inner surface of the glass sleeve is often done by manual grinding. Although manual grinding is highly flexible, it has problems such as high labor intensity and poor product consistency, which affects the quality of the product. To this end, the present application discloses a glass sleeve grinding tool, which mainly adopts the following scheme to achieve efficient and stable grinding of the outer and inner surfaces of the glass sleeve. The present application is further described in detail below.

[0021] Example 1 The present application embodiment discloses a glass sleeve grinding tool. Figure 1, including a base 1, a clamping fixture 2 and a grinding piece 3. A support frame 11 is fixedly arranged on the base 1, a spindle 4 is rotatably arranged on the support frame 11, the axial direction of the spindle 4 is parallel to the upper end face of the base 1, a motor 12 is fixedly arranged on the support frame 11, the output shaft of the motor 12 is coaxially fixedly connected with the spindle 4, and is used to drive the spindle 4 to rotate, and a fixing structure for fixing the clamping fixture 2 is arranged on the spindle 4, a mounting frame 13 is fixedly arranged on the base 1, and an adjustment frame 14 is slidably arranged on the mounting frame 13 along the direction perpendicular to the upper end face of the base 1. A connecting frame 5 is slidably arranged on the adjusting frame 14 along the axial direction of the spindle 4, and a connecting component for connecting the grinding piece 3 is arranged on the connecting frame 5.

[0022] Reference Figure 1 A limit piece for preventing the adjusting frame 14 from sliding is provided on the mounting frame 13. Specifically, the limit piece includes a limit screw 15. The limit screw 15 is rotatably provided on the mounting frame 13 and is threadably matched with the adjusting frame 14. The axial direction of the limit screw 15 is perpendicular to the upper end surface of the base, and a rotating handle 16 is coaxially fixed on the limit screw 15.

[0023] Reference Figure 1 A driving member for driving the connecting frame 5 to slide is provided on the adjusting frame 14, and the driving member includes a rodless cylinder 17. The rodless cylinder 17 is also fixedly arranged on the adjusting frame 14, and the length direction of the rodless cylinder 17 is parallel to the axial direction of the main shaft 4, and the piston of the rodless cylinder 17 is fixedly connected to the connecting frame 5.

[0024] Reference Figure 2 Specifically, the clamping tool 2 includes a first fixed frame 21 and a clamping plate 22. The first fixed frame 21 is adapted to the interior of the glass sleeve and is used to be inserted into the glass sleeve. A positioning plate 211 is fixedly provided at the end of one side of the first fixed frame 21, and the clamping plate 22 is fixed to the end of the other side of the first fixed frame 21 by bolts, and the glass sleeve is clamped and fixed on the first fixed frame 21 by the joint action of the positioning plate 211 and the clamping plate 22. When the glass sleeve is fixed on the first fixed frame 21, the outer surface of the glass sleeve is completely exposed to the environment. When the glass sleeve is installed, a rubber gasket 23 is arranged between the positioning plate 211 and the glass sleeve.

[0025] Reference Figure 3The fixing structure includes a mounting sleeve 41 coaxially fixed on the main shaft 4, a positioning plate 42 coaxially fixed on the main shaft 4, the mounting sleeve 41 is sleeved and fixed on the positioning plate 42, the mounting sleeve 41 is adapted to the positioning plate 211, and is used to be sleeved on the positioning plate 211, and the positioning plate 211 is fixed in the mounting sleeve 41 by bolts, ensuring that the first fixed frame 21 is firmly fixed on the main shaft 4 to prevent shaking during high-speed operation, and when the glass sleeve is fixed on the first fixed frame, the central axis of the main shaft 4 coincides with the central axis of the glass sleeve.

[0026] Reference Figure 4 The grinding piece 3 is arc-shaped, and its inner side wall is provided with a grinding surface, which is matched with the outer side wall of the glass sleeve and is used to grind the outer surface of the glass sleeve. In actual processing, the arc of the grinding piece 3 can be selected according to the size of the required glass sleeve, and the grinding piece 3 can be installed on the connecting frame 5 through the connecting component; at the same time, the grinding piece 3 of different materials can be customized according to the required grinding and polishing effect, and the abrasive grain size of the grinding surface can be adjusted.

[0027] Reference Figure 4 , 5 The connection assembly includes a connection sleeve 51 and a mounting rod 52. The connection sleeve 51 is fixed to the connection frame 5 by bolts. Both ends of the connection sleeve 51 are provided with plug-in slots 511 adapted to the mounting rod 52. The mounting rod 52 is used to be inserted into the plug-in slot 511 of the connection sleeve 51 and to have an interference fit with the connection sleeve 51. A connection rod 53 is inserted and fixedly provided on the mounting rod 52. A spherical body 531 is fixedly provided at the end of the connection rod 53. A spherical groove 31 adapted to the spherical body 531 is provided on the outer wall of the grinding member 3. An elastic limiting strip 532 is inserted in the spherical groove 31. A limiting groove 32 for placing the elastic limiting strip 532 is provided on the grinding member 3. Such a design allows the grinding member 3 to flexibly adjust its angle, so that the grinding member 3 of the grinding member 3 can better fit the outer surface of the glass sleeve. At the same time, the elastic limiting strip 532 is provided to further improve the stability of the grinding piece 3, thereby preventing the grinding piece 3 from shifting or falling off during the grinding process, thereby ensuring the grinding quality of the inner surface or outer surface of the glass sleeve.

[0028] The implementation principle of a glass sleeve grinding tool in Example 1 of the present application is as follows: fix the clamping tool 2 on the main shaft 4, then clamp and fix the glass sleeve on the first fixed frame 21, connect the grinding piece 3 to the connecting frame 5 through the connecting assembly, drive the adjusting frame 14 to slide, adjust the position of the connecting frame 5, and make the grinding surface of the inner wall of the grinding piece 3 abut the outer surface of the glass sleeve; then, drive the main shaft 4 to rotate through the motor 12, drive the glass sleeve to rotate, and at the same time, drive the connecting frame 5 to slide along the axial direction of the main shaft 4 through the rodless cylinder 17, drive the grinding piece 3 to slide along the axial direction of the glass sleeve on the outer surface of the glass sleeve, and realize the grinding of the outer surface of the glass sleeve. The whole process has a high degree of automation, which greatly reduces manual intervention and improves work efficiency and product quality.

[0029] Example 2 The difference from Example 1 is: Figure 6 , 7 The clamping tool 2 includes a second fixed frame 24 and a clamping ring 25. The second fixed frame 24 is provided with a placement groove adapted to the glass sleeve, and the second fixed frame 24 is used to be sleeved on the outside of the glass sleeve. The clamping ring 25 is fixed to the end of the second fixed frame 24 by a plurality of evenly distributed bolts. After the glass sleeve is placed in the placement groove of the second fixed frame 24, the clamping ring 25 is threadedly connected to the end of the second fixed frame 24, and the end of the glass sleeve is abutted by the clamping ring 25. The tightening force of the bolt is adjusted according to actual needs to ensure that the glass sleeve is firmly fixed in the placement groove of the second fixed frame 24. When the glass sleeve is fixed in the first fixed frame 21, the inner surface of the glass sleeve is completely exposed to the environment. When the glass sleeve is installed, a rubber gasket 23 is placed in the placement groove, and the rubber gasket 23 is covered between the glass sleeve and the bottom wall of the placement groove.

[0030] Reference Figure 8 The fixing structure is used to fix the second fixing frame 24 on the main shaft 4. Specifically, the fixing structure includes fixing bolts 43. The end of the second fixing frame 24 is fixed with an end plate 241 by bolts. The end plate 241 is provided with a mounting groove, which is adapted to the main shaft 4 for inserting the main shaft 4. The fixing bolts 43 are used to fix the end plate 241 on the main shaft 4 to ensure that the second fixing frame 24 is firmly fixed on the main shaft 4 to prevent shaking during the grinding process. When the glass sleeve is fixed in the second fixing frame, the central axis of the main shaft 4 coincides with the central axis of the glass sleeve.

[0031] Reference Figure 7 , 8A plurality of positioning blocks 421 are fixedly provided on one end of the positioning disk 42 close to the end plate 241, and a plurality of positioning grooves 242 are opened on one end of the end plate 241 close to the positioning disk 42. The positioning blocks 421 correspond to the positioning grooves 242 one by one and are used to be inserted into the corresponding positioning grooves 242; when the second fixed frame 24 is fixed on the main shaft 4, each positioning block 421 on the positioning disk 42 is inserted into the corresponding positioning groove 242 on the end plate 241, further increasing the stability of the second fixed frame 24 during installation.

[0032] Reference Fig. 9 , 10 The grinding piece 3 used in this embodiment is also arc-shaped, and its outer side wall is provided with a grinding surface, which is matched with the inner side wall of the glass sleeve and is used to grind the inner surface of the glass sleeve. The inner side wall of the grinding piece 3 is provided with a spherical groove 31 matched with the spherical body 531, and a limiting groove 32 for placing the elastic limiting strip 532.

[0033] The implementation principle of a glass sleeve grinding tool in Example 2 of the present application is as follows: when the inner surface of the glass sleeve needs to be ground, the corresponding clamping tool 2 and grinding piece 3 are replaced, the clamping tool 2 is fixed on the main shaft 4, and then the glass sleeve is clamped and fixed in the second fixed frame 24, the corresponding grinding piece 3 is connected to the connecting frame 5 through the connecting assembly, and the position of the adjusting frame 14 is readjusted to make the grinding piece 3 enter the glass sleeve, and the grinding surface of the outer wall of the grinding piece 3 abuts the inner surface of the glass sleeve, and then the main shaft 4 is driven to rotate by the motor 12 to drive the glass sleeve to rotate, and at the same time, the connecting frame 5 is driven by the rodless cylinder 17 to slide along the axial direction of the main shaft 4, driving the grinding piece 3 to slide along the axial direction of the glass sleeve in the glass sleeve, so as to realize the grinding of the inner surface of the glass sleeve. The whole process has a high degree of automation, which avoids the problems of high labor intensity and poor product consistency caused by manual grinding, and significantly improves production efficiency and product quality.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A glass sleeve grinding tool, characterized in that: The invention comprises a base (1), a clamping tool (2) and a grinding piece (3); a main shaft (4) is rotatably arranged on the base (1); a motor (12) is arranged on the base (1) for driving the main shaft (4) to rotate; a fixing structure for fixing the clamping tool (2) is arranged on the main shaft (4); the clamping tool (2) is used to clamp and fix the glass sleeve; a mounting frame (13) is fixedly arranged on the base (1); an upper edge of the mounting frame (13) is close to or away from the base An adjusting frame (14) is provided to slide in the direction of the seat (1); a stopper is provided on the mounting frame (13) for preventing the adjusting frame (14) from sliding; a connecting frame (5) is provided on the adjusting frame (14) to slide along the axial direction of the main shaft (4); a driving member is provided on the adjusting frame (14) for driving the connecting frame (5) to slide; a connecting assembly for connecting a grinding member (3) is provided on the connecting frame (5); and the grinding member (3) is used to grind the surface of the glass sleeve.

2. A glass sleeve grinding tool according to claim 1, characterized in that: The clamping tool (2) comprises a first fixing frame (21) and a clamping plate (22); the fixing structure is used to fix the first fixing frame (21) on the main shaft (4); the first fixing frame (21) is adapted to the interior of the glass sleeve and is used to be inserted into the glass sleeve; a positioning plate (211) is fixedly provided at the end of the first fixing frame; the clamping plate (22) is fixed to the end of the other side of the first fixing frame (21) by bolts; and the positioning plate (211) and the clamping plate (22) are used to clamp the two ends of the glass sleeve; the grinding piece (3) is used to grind the outer surface of the glass sleeve.

3. A glass sleeve grinding tool according to claim 2, characterized in that: The fixing structure comprises a mounting sleeve (41) coaxially fixedly arranged on the main shaft (4); the mounting sleeve (41) is adapted to the positioning plate (211) and is used to be sleeved on the positioning plate (211); the positioning plate (211) is fixed in the mounting sleeve (41) by bolts.

4. A glass sleeve grinding tool according to claim 2, characterized in that: The grinding piece (3) is arc-shaped, and the inner side wall of the grinding piece (3) is provided with a grinding surface, and the grinding surface is matched with the outer side wall of the glass sleeve.

5. A glass sleeve grinding tool according to claim 1, characterized in that: The clamping tool (2) comprises a second fixed frame (24) and a clamping ring (25); the fixing structure is used to fix the second fixed frame (24) on the main shaft (4); a placement groove adapted to the glass sleeve is provided inside the second fixed frame (24); the clamping ring (25) is fixed to the end of the second fixed frame (24) by bolts and is used to press and fix the glass sleeve in the placement groove of the second fixed frame (24); and the grinding piece (3) is used to grind the inner surface of the glass sleeve.

6. A glass sleeve grinding tool according to claim 5, characterized in that: The fixing structure comprises a fixing bolt (43); an end plate (241) is fixed to the end of the second fixing frame (24) by means of bolts; a mounting groove is provided on the end plate (241); the mounting groove is adapted to fit the main shaft (4) and is used for inserting the main shaft (4); and the fixing bolt (43) is used for fixing the end plate (241) on the main shaft (4).

7. A glass sleeve grinding tool according to claim 6, characterized in that: A positioning disk (42) is sleeved and fixed on the main shaft (4); a plurality of positioning blocks (421) are fixedly arranged on one end of the positioning disk (42) close to the end plate (241); a plurality of positioning grooves (242) are opened on one end of the end plate (241) close to the positioning disk (42); the positioning blocks (421) correspond to the positioning grooves (242) one by one and are used to be inserted into the corresponding positioning grooves (242).

8. A glass sleeve grinding tool according to claim 5, characterized in that: The grinding piece (3) is arc-shaped, and the outer side wall of the grinding piece (3) is provided with a grinding surface, and the grinding surface is matched with the inner side wall of the glass sleeve.

9. A glass sleeve grinding tool according to any one of claims 4 or 8, characterized in that: The connection assembly comprises a connection sleeve (51) and a mounting rod (52); the connection sleeve (51) is fixed on a connection frame (5); both ends of the connection sleeve (51) are provided with insertion grooves (511) adapted to the mounting rod (52); the mounting rod (52) is used to be inserted into the insertion grooves (511) of the connection sleeve (51) and to be interference-fitted with the connection sleeve (51); and the grinding element (3) is mounted on the mounting rod (52).

10. A glass sleeve grinding tool according to claim 9, characterized in that: A connecting rod (53) is fixedly arranged on the mounting rod (52), a spherical body (531) is fixedly arranged on the end of the connecting rod (53), a spherical groove (31) matched with the spherical body (531) is arranged on the grinding piece (3), and when the grinding surface is arranged on the inner wall of the grinding piece (3), the spherical groove (31) is arranged on the outer wall of the grinding piece (3), and when the grinding surface is arranged on the outer wall of the grinding piece (3), the spherical groove (31) is arranged on the inner wall of the grinding piece (3), an elastic limiting strip (532) is penetrated in the spherical groove (31), and a limiting groove (32) for accommodating the elastic limiting strip (532) is arranged on the grinding piece (3).

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