Polishing clamp and polishing equipment

Abstract

The polishing clamp comprises a support, a first expansion assembly, a second expansion assembly and a driving assembly, the support is provided with a first end and a second end, the first expansion assembly is arranged at the first end, the first expansion assembly comprises a first expansion sleeve and a first expansion shaft, and the second expansion assembly comprises a second expansion sleeve and a second expansion shaft. The first expansion assembly is arranged at the first end and comprises a first expansion sleeve and a first expansion shaft, the first expansion shaft is movably arranged in the first expansion sleeve in a penetrating mode and abuts against the first expansion sleeve, the second expansion assembly is arranged at the second end and comprises a second expansion sleeve and a second expansion shaft, and the second expansion shaft is movably arranged in the second expansion sleeve in a penetrating mode and abuts against the second expansion sleeve. The driving assembly can drive the first expansion shaft and the second expansion shaft to move, so that the first expansion sleeve and the second expansion sleeve are expanded or contracted at the same time, the polishing clamp can stably clamp the two ends of the U-shaped workpiece, the U-shaped workpiece is prevented from moving relative to the first expansion sleeve and the second expansion sleeve, and the polishing effect of the U-shaped workpiece can be improved.

Description

Technical Field

[0001] This utility model relates to the field of polishing fixture technology, and in particular to a polishing fixture and polishing equipment. Background Technology

[0002] Polishing equipment generally includes polishing fixtures and polishing components. The polishing components are used to polish U-shaped workpieces. When polishing U-shaped workpieces, the outer surface of the workpiece needs to be polished to meet process requirements. However, in order to fix the U-shaped workpiece, the fixture needs to hold both ends of the U-shaped workpiece. Existing fixtures cannot stably hold both ends of the U-shaped workpiece, resulting in poor polishing effect. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a polishing fixture that can improve the polishing effect of U-shaped workpieces.

[0004] This utility model also proposes a polishing device having the above-mentioned polishing fixture.

[0005] A polishing fixture according to a first aspect of the present invention includes:

[0006] A support having a first end and a second end;

[0007] A first tensioning component is disposed at the first end. The first tensioning component includes a first tensioning sleeve and a first tensioning shaft. The first tensioning shaft is movably inserted into the first tensioning sleeve and abuts against the first tensioning sleeve to cause the first tensioning sleeve to expand or contract.

[0008] A second tensioning component is disposed at the second end. The second tensioning component includes a second tensioning sleeve and a second tensioning shaft. The second tensioning shaft is movably inserted into the second tensioning sleeve and abuts against the second tensioning sleeve to cause the second tensioning sleeve to expand or contract.

[0009] A drive assembly is provided on the bracket. The first tensioning shaft and the second tensioning shaft are respectively connected to the drive assembly. The drive assembly can drive the first tensioning shaft and the second tensioning shaft to move so that the first tensioning sleeve and the second tensioning sleeve expand or contract simultaneously.

[0010] A polishing fixture according to a first aspect embodiment of the present invention has at least the following beneficial effects:

[0011] When using the polishing fixture, the end of the first tightening sleeve furthest from the support is inserted into one end of the U-shaped workpiece, and the end of the second tightening sleeve furthest from the support is inserted into the other end of the U-shaped workpiece. Then, the drive assembly drives the first and second tightening shafts to move. When the first tightening shaft moves, it drives the first tightening sleeve to expand, and the first tightening sleeve abuts against the inner circumferential wall of one end of the U-shaped workpiece. The first tightening sleeve can expand and lock one end of the U-shaped workpiece. When the second tightening shaft moves, it drives the second tightening sleeve to expand, and the second tightening sleeve abuts against the inner circumferential wall of the other end of the U-shaped workpiece. The second tightening sleeve can expand and lock the other end of the U-shaped workpiece, so that the polishing fixture can stably clamp both ends of the U-shaped workpiece to prevent the U-shaped workpiece from moving relative to the first and second tightening sleeves, thereby improving the polishing effect of the U-shaped workpiece.

[0012] According to some embodiments of the present invention, the first tightening sleeve includes a first connecting portion and a plurality of first tightening portions connected to the first connecting portion. A first tightening shaft passes through the first connecting portion, and the plurality of first tightening portions are arranged around the axis of the first tightening shaft. The outer peripheral surface of the first tightening shaft abuts against each of the first tightening portions; and / or,

[0013] The second tightening sleeve includes a second connecting portion and a plurality of second tightening portions connected to the second connecting portion. The second tightening shaft passes through the second connecting portion, and the plurality of second tightening portions are arranged around the axis of the second tightening shaft. The outer peripheral surface of the second tightening shaft abuts against each of the second tightening portions.

[0014] According to some embodiments of the present invention, a plurality of first anti-slip portions are provided on the side of the first tightening portion away from the first tightening shaft, and the first anti-slip portions are used to abut against the inner peripheral wall of one end of the U-shaped workpiece; and / or,

[0015] The second tensioning part is provided with a plurality of second anti-slip parts on the side away from the second tensioning shaft. The second anti-slip parts are used to abut against the inner peripheral wall of the other end of the U-shaped workpiece.

[0016] According to some embodiments of the present invention, a first deformation groove is formed between adjacent first tightening portions. The first deformation groove includes a first groove segment and a second groove segment that are sequentially connected along the axial direction of the first tightening shaft. The first groove segment is close to the first connecting portion, and the sidewall of the first groove segment has an arc-shaped structure; and / or,

[0017] A second deformation groove is formed between adjacent second tightening portions. The second deformation groove includes a third groove segment and a fourth groove segment that are sequentially connected along the axial direction of the second tightening shaft. The third groove segment is close to the second connecting portion, and the sidewall of the third groove segment has an arc-shaped structure.

[0018] According to some embodiments of the present invention, the first connecting part and the first tightening part are integral structures, and / or the second connecting part and the second tightening part are integral structures.

[0019] According to some embodiments of the present invention, the driving assembly includes a first driving member, a second driving member, a first lever, and a second lever. The first lever has a first hinge end, a second hinge end, and a third hinge end arranged side by side and spaced apart. The second hinge end is hinged to the bracket. The first hinge end is hinged to the output end of the first driving member. The third hinge end is hinged to the first tensioning shaft. The distance between the first hinge end and the second hinge end is greater than the distance between the third hinge end and the second hinge end.

[0020] The second lever has a fourth hinge end, a fifth hinge end, and a sixth hinge end arranged side by side at intervals. The fifth hinge end is hinged to the bracket, the fourth hinge end is hinged to the output end of the second drive member, and the sixth hinge end is hinged to the second tensioning shaft. The distance between the fourth hinge end and the fifth hinge end is greater than the distance between the sixth hinge end and the fifth hinge end.

[0021] According to some embodiments of the present invention, the outer diameter of the first tensioning shaft gradually increases along its axial direction; and / or,

[0022] Along the axial direction of the second tensioning shaft, the outer diameter of the second tensioning shaft gradually increases.

[0023] According to some embodiments of the present invention, the polishing fixture further includes a clamping assembly, which is disposed on the bracket and is used to clamp the middle position of the U-shaped workpiece.

[0024] According to some embodiments of the present invention, the clamping assembly includes a third driving member and a clamping driving member disposed at the output end of the third driving member. The third driving member is used to drive the clamping driving member to move axially along the first tensioning shaft, and the clamping driving member is used to clamp the middle position of the U-shaped workpiece.

[0025] The polishing apparatus according to a second aspect of the present invention includes the polishing fixture described in the above embodiments.

[0026] The polishing apparatus according to the second aspect embodiment of the present invention has at least the following beneficial effects:

[0027] When using the polishing fixture, the end of the first tightening sleeve furthest from the support is inserted into one end of the U-shaped workpiece, and the end of the second tightening sleeve furthest from the support is inserted into the other end of the U-shaped workpiece. Then, the drive assembly drives the first and second tightening shafts to move. When the first tightening shaft moves, it drives the first tightening sleeve to expand, and the first tightening sleeve abuts against the inner circumferential wall of one end of the U-shaped workpiece. The first tightening sleeve can expand and lock one end of the U-shaped workpiece. When the second tightening shaft moves, it drives the second tightening sleeve to expand, and the second tightening sleeve abuts against the inner circumferential wall of the other end of the U-shaped workpiece. The second tightening sleeve can expand and lock the other end of the U-shaped workpiece, so that the polishing fixture can stably clamp both ends of the U-shaped workpiece to prevent the U-shaped workpiece from moving relative to the first and second tightening sleeves, thereby improving the polishing effect of the U-shaped workpiece.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the structure of a polishing fixture according to an embodiment of the present utility model;

[0031] Figure 2 This is an exploded view of a polishing fixture according to an embodiment of the present utility model;

[0032] Figure 3 for Figure 1 Top view;

[0033] Figure 4 for Figure 3 Sectional view of line AA in the middle;

[0034] Figure 5 This is a schematic diagram of the structure of the first or second tensioning component according to an embodiment of the present utility model;

[0035] Figure 6 This is an exploded view of the first or second tensioning component according to an embodiment of the present utility model;

[0036] Figure 7 This is a schematic diagram of the structure of the first or second expansion sleeve according to an embodiment of the present invention.

[0037] Figure label:

[0038] Support 100, first end 101, second end 102, first tensioning assembly 200, first tensioning sleeve 210, first connecting part 211, first tensioning part 212, first anti-slip part 213, first deformation groove 214, first groove segment 215, second groove segment 216, first tensioning shaft 220, second tensioning assembly 300, second tensioning sleeve 310, second connecting part 311, second tensioning part 312, second anti-slip part 313, second deformation groove 314, third groove segment 315, fourth groove segment 316, second tensioning shaft 320, first driving member 410, second driving member 420, first lever 430, second lever 440, third driving member 510, clamping driving member 520, U-shaped workpiece 600. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0042] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0043] In related technologies, polishing equipment generally includes polishing fixtures and polishing components. The polishing components are used to polish U-shaped workpieces. When polishing U-shaped workpieces, the outer surface of the U-shaped workpiece needs to be polished to meet process requirements. However, in order to fix the U-shaped workpiece, the fixture needs to hold both ends of the U-shaped workpiece. Existing fixtures use gripper cylinders to hold the U-shaped workpiece, which cannot stably hold both ends of the U-shaped workpiece, resulting in poor polishing effect.

[0044] Reference Figures 1 to 7 A polishing fixture according to a first aspect of the present invention includes a support 100, a first tensioning component 200, a second tensioning component 300, and a driving component. The support 100 has a first end 101 and a second end 102. The first tensioning component 200 is disposed at the first end 101 and includes a first tensioning sleeve 210 and a first tensioning shaft 220. The first tensioning shaft 220 is movably inserted into the first tensioning sleeve 210 and abuts against the first tensioning sleeve 210 to expand or contract the first tensioning sleeve 210. The second tensioning component 300 is disposed at the second end 102 and includes a second tensioning sleeve 310 and a second tensioning shaft 320. The second tensioning shaft 320 is movably inserted into the second tensioning sleeve 310 and abuts against the second tensioning sleeve 320. The second tightening sleeve 310 abuts against the support to expand or contract. The drive assembly is located on the bracket 100. The first tightening shaft 220 and the second tightening shaft 320 are respectively connected to the drive assembly. The drive assembly can drive the first tightening shaft and the second tightening shaft 320 to move, so that the first tightening sleeve 210 and the second tightening sleeve 310 expand or contract simultaneously. In this way, the first tightening sleeve 210 can expand and lock one end of the U-shaped workpiece 600, and the second tightening sleeve 310 can expand and lock the other end of the U-shaped workpiece 600. This allows the polishing fixture to stably hold both ends of the U-shaped workpiece 600 to prevent the U-shaped workpiece 600 from moving relative to the first tightening sleeve 210 and the second tightening sleeve 310, thereby improving the polishing effect of the U-shaped workpiece 600.

[0045] For example, when using the polishing fixture, the end of the first expansion sleeve 210 furthest from the support 100 is inserted into one end of the U-shaped workpiece 600, and the end of the second expansion sleeve 310 furthest from the support 100 is inserted into the other end of the U-shaped workpiece 600. Then, the drive assembly drives the first expansion shaft 220 and the second expansion shaft 320 to move. When the first expansion shaft 220 moves, it drives the first expansion sleeve 210 to expand, and the first expansion sleeve 210 abuts against the inner peripheral wall of one end of the U-shaped workpiece 600. The second expansion shaft 320 can expand and lock one end of the U-shaped workpiece 600. When the second expansion shaft 320 moves, the second expansion shaft 320 drives the second expansion sleeve 310 to expand. The second expansion sleeve 310 abuts against the inner peripheral wall of the other end of the U-shaped workpiece 600. The second expansion sleeve 310 can expand and lock the other end of the U-shaped workpiece 600, so that the polishing fixture can stably hold both ends of the U-shaped workpiece 600 to prevent the U-shaped workpiece 600 from moving relative to the first expansion sleeve 210 and the second expansion sleeve 310, thereby improving the polishing effect of the U-shaped workpiece 600.

[0046] It should be noted that the U-shaped workpiece 600 can be a metal component such as a door handle, and there are no restrictions on its use.

[0047] Reference Figures 4 to 6 In some embodiments of this utility model, the first expansion sleeve 210 includes a first connecting portion 211 and a plurality of first expansion portions 212 connected to the first connecting portion 211. A first expansion shaft 220 passes through the first connecting portion 211. The plurality of first expansion portions 212 are arranged around the axis of the first expansion shaft 220. The outer peripheral surface of the first expansion shaft 220 abuts against each first expansion portion 212, so that the plurality of first expansion portions 212 can expand or contract, which can facilitate fixing or loosening the U-shaped workpiece 600.

[0048] For example, four first tightening parts 212 are arranged around the axis of the first tightening shaft 220. The four first tightening parts 212 form a first receiving groove. One end of the first tightening shaft 220 passes through the first receiving groove. In a direction perpendicular to the axial direction of the first tightening shaft 220, the cross-section of the first tightening shaft 220 matches the cross-section of the first receiving groove. The outer peripheral surface of the first tightening shaft 220 abuts against the inner side of the first tightening parts 212, so that the multiple first tightening parts 212 can expand or contract, which can facilitate fixing or loosening the U-shaped workpiece 600.

[0049] Reference Figure 7In some embodiments of this utility model, a plurality of first anti-slip portions 213 are provided on the side of the first tightening portion 212 away from the first tightening shaft 220. The first anti-slip portions 213 are used to abut against the inner peripheral wall of one end of the U-shaped workpiece 600. The plurality of first anti-slip portions 213 have a sawtooth structure, which can increase the connection reliability between the first tightening portion 212 and the U-shaped workpiece 600, thereby improving the polishing effect of the U-shaped workpiece 600.

[0050] Reference Figure 5 , Figure 7 In some embodiments of this utility model, a first deformation groove 214 is formed between adjacent first tightening portions 212. The first deformation groove 214 includes a first groove segment 215 and a second groove segment 216 that are sequentially connected along the axial direction of the first tightening shaft 220. The first groove segment 215 is close to the first connecting portion 211, and the sidewall of the first groove segment 215 is an arc-shaped structure, which is conducive to the elastic deformation of the first tightening portion 212 and can prevent the first tightening portion 212 from breaking with the first connecting portion 211.

[0051] For example, the second groove segment 216 is a strip structure and the first groove segment 215 is a circular structure. One end of the second groove segment 216 extends through the side wall of the first groove segment 215. Since the side wall of the first groove segment 215 is an arc-shaped structure, it is beneficial for the first tightening part 212 to generate elastic deformation, which can prevent the first tightening part 212 from breaking with the first connecting part 211.

[0052] In some embodiments of this utility model, the first connecting part 211 and the first tightening part 212 are integral structures. The first connecting part 211 and the first tightening part 212 can be integrally formed by die casting, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds and thus reducing the production and manufacturing cost of the first tightening sleeve 210.

[0053] Similarly, in some embodiments of this utility model, the second expansion sleeve 310 includes a second connecting portion 311 and a plurality of second expansion portions 312 connected to the second connecting portion 311. The second expansion shaft 320 passes through the second connecting portion 311, and the plurality of second expansion portions 312 are arranged around the axis of the second expansion shaft 320. The outer peripheral surface of the second expansion shaft 320 abuts against each second expansion portion 312, so that the plurality of second expansion portions 312 can expand or contract, which can facilitate fixing or loosening the U-shaped workpiece 600.

[0054] For example, four second tightening portions 312 are arranged around the axis of the second tightening shaft 320. The four second tightening portions 312 form a second receiving groove. One end of the second tightening shaft 320 passes through the second receiving groove. In a direction perpendicular to the axial direction of the second tightening shaft 320, the cross-section of the second tightening shaft 320 matches the cross-section of the second receiving groove. The outer peripheral surface of the second tightening shaft 320 abuts against the inner side of the second tightening portion 312, so that the multiple second tightening portions 312 can expand or contract, which can facilitate fixing or loosening the U-shaped workpiece 600.

[0055] In some embodiments of this utility model, a plurality of second anti-slip portions 313 are provided on the side of the second tightening portion 312 away from the second tightening shaft 320. The second anti-slip portions 313 are used to abut against the inner peripheral wall of the other end of the U-shaped workpiece 600. The plurality of second anti-slip portions 313 have a sawtooth structure, which can increase the connection reliability between the second tightening portion 312 and the U-shaped workpiece 600, thereby improving the polishing effect of the U-shaped workpiece 600.

[0056] In some embodiments of this utility model, a second deformation groove 314 is formed between adjacent second tightening portions 312. The second deformation groove 314 includes a third groove segment 315 and a fourth groove segment 316 that are sequentially connected along the axial direction of the second tightening shaft 320. The third groove segment 315 is close to the second connecting portion 311, and the sidewall of the third groove segment 315 is an arc-shaped structure, which is conducive to the elastic deformation of the second tightening portion 312 and can prevent the second tightening portion 312 from breaking with the second connecting portion 311.

[0057] For example, the third groove segment 315 is a strip structure and the fourth groove segment 316 is a circular structure. One end of the third groove segment 315 extends through the side wall of the fourth groove segment 316. Since the side wall of the fourth groove segment 316 is an arc-shaped structure, it is beneficial for the second tightening part 312 to generate elastic deformation, which can prevent the second tightening part 312 from breaking with the second connecting part 311.

[0058] In some embodiments of this utility model, the second connecting part 311 and the second tightening part 312 are integral structures. The second connecting part 311 and the second tightening part 312 can be integrally formed by die casting, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds and thus reducing the production and manufacturing cost of the second tightening sleeve 310.

[0059] Reference Figure 1 , Figure 2In some embodiments of this utility model, the driving assembly includes a first driving member 410, a second driving member 420, a first lever 430, and a second lever 440. The first lever 430 has a first hinge end, a second hinge end, and a third hinge end arranged side by side and spaced apart. The second hinge end is hinged to the bracket 100, the first hinge end is hinged to the output end of the first driving member 410, and the third hinge end is hinged to the first tensioning shaft 220. The distance between the first hinge end and the second hinge end is greater than the distance between the third hinge end and the second hinge end. The second lever 440 has a fourth hinge end, a fifth hinge end, and a sixth hinge end arranged side by side and spaced apart. The fifth hinge end... Hinged to the bracket 100, the fourth hinge end is hinged to the output end of the second drive member 420, and the sixth hinge end is hinged to the second tensioning shaft 320. The distance between the fourth hinge end and the fifth hinge end is greater than the distance between the sixth hinge end and the fifth hinge end. The first lever 430 and the second lever 440 are both force-saving lever structures. The first lever 430 can amplify the output force of the first drive member 410, which is conducive to the first tensioning shaft 220 expanding the first tensioning sleeve 210. Similarly, the second lever 440 can amplify the output force of the second drive member 420, which is conducive to the second tensioning shaft 320 expanding the second tensioning sleeve 310, and can facilitate the expansion and locking of the U-shaped workpiece 600.

[0060] In some embodiments of this utility model, the outer diameter of the first tensioning shaft 220 gradually increases along the axial direction of the first tensioning shaft 220, and the outer surface of the first tensioning shaft 220 has a taper, which can increase the contact area between the first tensioning shaft 220 and the first tensioning sleeve 210, so that the first tensioning sleeve 210 is subjected to uniform force, and can improve the service life of the first tensioning assembly 200.

[0061] As another implementation, the outer diameter of the first tensioning shaft 220 can be gradually increased along the axial direction of the first tensioning shaft 220, which is not limited here.

[0062] Similarly, along the axial direction of the second tensioning shaft 320, the outer diameter of the second tensioning shaft 320 gradually increases, and the outer surface of the second tensioning shaft 320 has a taper, which can increase the contact area between the second tensioning shaft 320 and the second tensioning sleeve 310, so that the second tensioning sleeve 310 is subjected to uniform force, and can improve the service life of the second tensioning assembly 300.

[0063] As another implementation, the outer diameter of the second tensioning shaft 320 can be gradually increased along the axial direction of the second tensioning shaft 320, which is not limited here.

[0064] Reference Figure 1 , Figure 2In some embodiments of this utility model, the polishing fixture further includes a clamping component, which is disposed on the bracket 100. The clamping component is used to clamp the middle position of the U-shaped workpiece 600, which can reduce the bending deformation of the U-shaped workpiece 600 and thereby improve the yield of the U-shaped workpiece 600.

[0065] In some embodiments of this utility model, the clamping assembly includes a third driving member 510 and a clamping driving member 520 disposed at the output end of the third driving member 510. The third driving member 510 is used to drive the clamping driving member 520 to move axially along the first tensioning shaft 220. The clamping driving member 520 is used to clamp the middle position of the U-shaped workpiece 600, which can reduce the bending deformation of the U-shaped workpiece 600 and thus improve the yield of the U-shaped workpiece 600.

[0066] It should be noted that the clamping drive component 520 is a gripper cylinder, and the first drive component 410, the second drive component 420 and the third drive component 510 are power components such as linear cylinders or linear electric cylinders, which are not restricted here.

[0067] Reference Figure 1 , Figure 2 The polishing device according to the second aspect of the present invention includes a polishing fixture according to the first aspect of the present invention. A first expansion sleeve 210 can expand and lock one end of a U-shaped workpiece 600, and a second expansion sleeve 310 can expand and lock the other end of the U-shaped workpiece 600, so that the polishing fixture can stably hold both ends of the U-shaped workpiece 600 to prevent the U-shaped workpiece 600 from moving relative to the first expansion sleeve 210 and the second expansion sleeve 310, thereby improving the polishing effect of the U-shaped workpiece 600.

[0068] For example, when using the polishing fixture, the end of the first expansion sleeve 210 furthest from the support 100 is inserted into one end of the U-shaped workpiece 600, and the end of the second expansion sleeve 310 furthest from the support 100 is inserted into the other end of the U-shaped workpiece 600. Then, the drive assembly drives the first expansion shaft 220 and the second expansion shaft 320 to move. When the first expansion shaft 220 moves, it drives the first expansion sleeve 210 to expand, and the first expansion sleeve 210 abuts against the inner peripheral wall of one end of the U-shaped workpiece 600. The second expansion shaft 320 can expand and lock one end of the U-shaped workpiece 600. When the second expansion shaft 320 moves, the second expansion shaft 320 drives the second expansion sleeve 310 to expand. The second expansion sleeve 310 abuts against the inner peripheral wall of the other end of the U-shaped workpiece 600. The second expansion sleeve 310 can expand and lock the other end of the U-shaped workpiece 600, so that the polishing fixture can stably hold both ends of the U-shaped workpiece 600 to prevent the U-shaped workpiece 600 from moving relative to the first expansion sleeve 210 and the second expansion sleeve 310, thereby improving the polishing effect of the U-shaped workpiece 600.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A polishing fixture for polishing a U-shaped workpiece (600), characterized in that, include: The bracket (100) has a first end (101) and a second end (102); A first tensioning assembly (200) is disposed at the first end (101). The first tensioning assembly includes a first tensioning sleeve (210) and a first tensioning shaft (220). The first tensioning shaft (220) is movably inserted into the first tensioning sleeve (210) and abuts against the first tensioning sleeve (210) to cause the first tensioning sleeve (210) to expand or contract. A second tensioning assembly (300) is disposed at the second end (102). The second tensioning assembly includes a second tensioning sleeve (310) and a second tensioning shaft (320). The second tensioning shaft (320) is movably inserted into the second tensioning sleeve (310) and abuts against the second tensioning sleeve (310) to cause the second tensioning sleeve (310) to expand or contract. A drive assembly is provided on the bracket (100). The first tensioning shaft (220) and the second tensioning shaft (320) are respectively connected to the drive assembly. The drive assembly can drive the first tensioning shaft and the second tensioning shaft (320) to move so that the first tensioning sleeve (210) and the second tensioning sleeve (310) expand or contract simultaneously.

2. A polishing fixture according to claim 1, characterized in that, The first tightening sleeve (210) includes a first connecting portion (211) and a plurality of first tightening portions (212) connected to the first connecting portion (211). A first tightening shaft (220) passes through the first connecting portion (211), and the plurality of first tightening portions (212) are arranged around the axis of the first tightening shaft (220). The outer peripheral surface of the first tightening shaft (220) abuts against each of the first tightening portions (212); and / or, The second expansion sleeve (310) includes a second connecting portion (311) and a plurality of second expansion portions (312) connected to the second connecting portion (311). The second expansion shaft (320) passes through the second connecting portion (311). The plurality of second expansion portions (312) are arranged around the axis of the second expansion shaft (320). The outer peripheral surface of the second expansion shaft (320) abuts against each of the second expansion portions (312).

3. A polishing fixture according to claim 2, characterized in that, The first tightening part (212) has a plurality of first anti-slip parts (213) on the side away from the first tightening shaft (220), and the first anti-slip parts (213) are used to abut against the inner peripheral wall of one end of the U-shaped workpiece (600); and / or, The second tensioning part (312) is provided with a plurality of second anti-slip parts (313) on the side away from the second tensioning shaft (320), and the second anti-slip parts (313) are used to abut against the inner peripheral wall of the other end of the U-shaped workpiece (600).

4. A polishing fixture according to claim 2, characterized in that, A first deformation groove (214) is formed between adjacent first tightening portions (212). The first deformation groove (214) includes a first groove segment (215) and a second groove segment (216) that are sequentially connected along the axial direction of the first tightening shaft (220). The first groove segment (215) is close to the first connecting portion (211), and the sidewall of the first groove segment (215) has an arc-shaped structure; and / or, A second deformation groove (314) is formed between adjacent second expansion portions (312). The second deformation groove (314) includes a third groove segment (315) and a fourth groove segment (316) that are sequentially connected along the axial direction of the second expansion shaft (320). The third groove segment (315) is close to the second connecting portion (311), and the sidewall of the third groove segment (315) has an arc-shaped structure.

5. A polishing fixture according to claim 2, characterized in that, The first connecting part (211) and the first tightening part (212) are integral structures, and / or the second connecting part (311) and the second tightening part (312) are integral structures.

6. A polishing fixture according to claim 1, characterized in that, The drive assembly includes a first drive member (410), a second drive member (420), a first lever (430), and a second lever (440). The first lever (430) has a first hinge end, a second hinge end, and a third hinge end arranged side by side. The second hinge end is hinged to the bracket (100). The first hinge end is hinged to the output end of the first drive member (410). The third hinge end is hinged to the first tensioning shaft (220). The distance between the first hinge end and the second hinge end is greater than the distance between the third hinge end and the second hinge end. The second lever (440) has a fourth hinge end, a fifth hinge end and a sixth hinge end arranged side by side. The fifth hinge end is hinged to the bracket (100), the fourth hinge end is hinged to the output end of the second drive member (420), and the sixth hinge end is hinged to the second tensioning shaft (320). The distance between the fourth hinge end and the fifth hinge end is greater than the distance between the sixth hinge end and the fifth hinge end.

7. A polishing fixture according to claim 1, characterized in that, Along the axial direction of the first tensioning shaft (220), the outer diameter of the first tensioning shaft (220) gradually increases; and / or, Along the axial direction of the second tensioning shaft (320), the outer diameter of the second tensioning shaft (320) gradually increases.

8. A polishing fixture according to claim 1, characterized in that, The polishing fixture also includes a clamping assembly disposed on the bracket (100) and is used to clamp the middle position of the U-shaped workpiece (600).

9. A polishing fixture according to claim 8, characterized in that, The clamping assembly includes a third drive member (510) and a clamping drive member (520) disposed at the output end of the third drive member (510). The third drive member (510) is used to drive the clamping drive member (520) to move axially along the first tensioning shaft (220). The clamping drive member (520) is used to clamp the U-shaped workpiece (600) at the middle position.

10. A polishing device, characterized in that, Includes a polishing fixture as described in any one of claims 1 to 9.

Images