Stable grinding clamp

Abstract

The stable type grinding clamp comprises a base plate, at least four positioning pieces are arranged at the top end of the base plate in the circumferential direction, each positioning piece is movably positioned on the base plate in the radial direction of the base plate, and the positioning pieces comprise the first positioning piece and the second positioning piece; the side, close to the circle center of the chassis, of the top end of the first positioning piece is sunken downwards to form a positioning groove. The top end of the second positioning piece is rotationally connected with an eccentric locking piece. When the workpiece needs to be clamped, the position of the positioning piece is adjusted in the direction of the circle center of the base plate till the bottom face of the workpiece is supported by the groove bottom of the positioning groove, the side wall of the workpiece abuts against the groove wall of the positioning groove, the side wall of the narrow side of the eccentric locking piece abuts against the side wall of the workpiece, and the eccentric locking piece is rotated in the locking direction; and the side wall of the wider side of the eccentric locking piece pushes the side wall of the workpiece. According to the stable grinding clamp, the clamping force on a workpiece is uniform, and the workpiece is prevented from deforming; the grinding clamp is easy and convenient to adjust; and a workpiece has better flatness after being ground.

Description

Technical Field

[0001] The utility model generally relates to the technical field of mechanical processing, and in particular to a stable grinding fixture. Background Art

[0002] During the machining process, in order to improve the aesthetics of the workpiece surface or make the fitting surface between the two workpieces smoother, the workpiece needs to be ground and polished to reduce the roughness of the workpiece surface. During the grinding process, in order to keep the workpiece fixed, a three-jaw chuck is usually selected to clamp the workpiece. The three-jaw chuck is mainly composed of a large bevel gear, three small bevel gears, three claws, and a chuck body that acts as a bracket. The three small bevel gears are meshed with the large bevel gear. There is a flat thread structure on the back of the large bevel gear, and the three claws are equally installed on the flat thread. The small bevel gear is provided with a square hole that cooperates with the wrench. When the small bevel gear is turned with a wrench, the large bevel gear rotates, and the flat thread on its back causes the three claws to move closer to or retreat from the center at the same time.

[0003] However, the use of a three-jaw chuck to clamp a workpiece has the following defects: since the contact area between the three jaws and the workpiece is small, it is easy to cause uneven clamping force on the workpiece when the three jaws clamp the workpiece, resulting in deformation of the workpiece; and, when clamping or loosening the workpiece, it is necessary to insert a wrench into the square hole and rotate the small bevel gear to control the movement of the jaws, making the loading and unloading operations of the workpiece more complicated and inefficient; not only that, the jaw end reference surfaces of the three jaws are at different heights. When clamping the workpiece, it is difficult to keep the workpiece surface to be ground level, resulting in unqualified flatness of the workpiece after grinding. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a stable grinding fixture, in which a plurality of positioning members circumferentially arranged on the chassis jointly clamp the workpiece, so that the workpiece is subjected to the clamping force of the plurality of positioning members, and the side walls and bottom surface of the workpiece fit against the groove walls and groove bottom of the positioning groove, so that the contact surface between the first positioning member and the workpiece is larger, thereby making the clamping force on the workpiece more uniform and preventing deformation; and, by rotating and adjusting the eccentric locking member, the workpiece can be easily clamped or loosened, making the loading and unloading operations of the workpiece simpler and improving the efficiency of the grinding process; not only that, the workpiece is supported by the groove bottom of the positioning groove on the first positioning member, and the groove bottoms of each positioning groove are located on the same horizontal plane, so that the grinding surface of the workpiece after clamping can also be kept horizontal, so that the workpiece has a better flatness after grinding.

[0005] The solution of the utility model is achieved like this:

[0006] The present application provides a stable grinding fixture, comprising a chassis, at least four positioning members are arranged along the circumferential direction at the top end of the chassis, each positioning member is movably positioned on the chassis along the radial direction of the chassis, the positioning members comprising a first positioning member and a second positioning member, a top end of the first positioning member is concave downwardly to form a positioning groove on one side close to the center of the chassis, the bottom of the positioning groove is used to support the bottom surface of the workpiece, the groove wall of the positioning groove is used to abut the side wall of the workpiece, and the top end of the second positioning member is rotatably connected with an eccentric locking member; when the stable grinding fixture clamps the workpiece, the position of the positioning member is adjusted toward the center of the chassis until the bottom surface of the workpiece is supported by the bottom of the positioning groove, the side wall of the workpiece abuts against the groove wall of the positioning groove, and the side wall of the eccentric locking member with a narrower thickness abuts against the side wall of the workpiece, and the eccentric locking member is rotated in the locking direction, and the side wall of the eccentric locking member with a wider thickness rotates toward the center of the chassis and pushes the side wall of the workpiece, so that the workpiece is clamped between the eccentric locking member and the positioning groove.

[0007] Furthermore, the positioning member and the chassis are connected via a sliding assembly, which includes sliding grooves distributed radially along the chassis and sliding blocks slidably matched with the sliding grooves, the sliding grooves being provided in one of the positioning member and the chassis, and the sliding blocks being provided in the other of the positioning member and the chassis. By providing the sliding assembly, not only the connection between the positioning member and the chassis is made more stable, but also when the position of the positioning member is adjusted, the positioning member is guided by the sliding grooves to ensure that the positioning member moves in the radial direction of the chassis, making the adjustment operation of the positioning member easier.

[0008] Furthermore, the sliding groove is provided on the chassis, a plurality of first positioning holes are provided on the sliding groove, a second positioning hole is provided on the positioning member in a vertical direction, and the first positioning hole and the second positioning hole are fixed in series by screws. The positioning member and the chassis are connected and fixed by screws, so that when the workpiece is clamped, the connection between the positioning member and the chassis is stable, and it is also convenient to remove the positioning member from the chassis for repositioning.

[0009] Furthermore, nine first positioning holes are provided on the sliding groove along the direction in which the sliding groove is provided, so that the grinding fixture can adapt to more workpieces of different sizes, thereby improving the practicality of the grinding fixture.

[0010] Furthermore, a positioning assembly is provided between the positioning piece and the sliding groove, and the positioning assembly includes a positioning protrusion and a groove engaged with the positioning protrusion, the positioning protrusion is provided on one of the sliding block and the sliding groove, and the groove is provided on the other of the sliding block and the sliding groove. This not only facilitates fixing the positioning piece on the sliding groove, but also facilitates the user to screw in the screws to fix the positioning piece on the chassis.

[0011] Furthermore, eight sliding grooves are provided on the chassis, and the angle between two adjacent sliding grooves is 45°, so that eight positioning members can be provided on the chassis to clamp the workpieces, and the spacing between any two adjacent workpieces is equal, so that the clamping force on the workpieces is more uniform.

[0012] Furthermore, the second positioning members are arranged in two symmetrical sliding grooves on the left and right sides of the chassis. When the workpiece is clamped by the positioning members, the directions of the two clamping forces are symmetrical to each other, so that the clamping force on the workpiece is more uniform, and the workpiece can be clamped more stably between the positioning members and is not easily deformed due to uneven force.

[0013] Furthermore, the eccentric locking member includes an eccentric screw, which includes an eccentric portion and a connecting portion that are connected by bending, the connecting portion is screwed to the second positioning member and can rotate relative to the second positioning member, and a pressure block is sleeved on the eccentric portion. When the eccentric screw rotates, the pressure block pushes or loosens the workpiece. Not only can the eccentric locking member be rotated and adjusted by the eccentric screw, but the eccentric locking member can also stably clamp the workpiece without rotating under the reaction force of the workpiece.

[0014] Furthermore, the pressing block is an elastic member, so that the pressing block applies elastic pushing to the workpiece, thereby preventing the workpiece from being subjected to the clamping force from the pressing block and causing friction between the pressing block and the side wall of the workpiece to cause wear, thereby providing better protection for the workpiece.

[0015] Furthermore, an operating rod protrudes from the side wall of the eccentric locking member, and the user can adjust the rotation direction of the eccentric locking member by turning the operating rod, making the operation of adjusting the eccentric locking member easier and more labor-saving.

[0016] The stable grinding fixture provided by the present application clamps the workpiece together by multiple positioning members circumferentially arranged on the chassis, so that the workpiece is subjected to the clamping force of the multiple positioning members, and a positioning groove is recessed on the first positioning member, and the side wall and bottom surface of the workpiece fit the groove wall and groove bottom of the positioning groove, so that the contact surface between the first positioning member and the workpiece is larger, so that the clamping force on the workpiece is more uniform, thereby effectively preventing the workpiece from being deformed due to uneven clamping force; and after the workpiece is initially fixed by the multiple positioning members, the eccentric locking member on the second positioning member is twisted, and the side wall of the wider side of the eccentric locking member rotates toward the center of the chassis and pushes up Push the side wall of the workpiece, so that the workpiece is clamped between the eccentric locking piece and the positioning groove. When the workpiece needs to be removed, the eccentric locking piece is rotated in the opposite direction to rotate the side wall of the eccentric locking piece on the wider side outward and release the workpiece, so that the workpiece can be freely removed; thus, by adjusting the eccentric locking piece, the workpiece can be easily clamped or loosened, making the loading and unloading operations of the workpiece simpler and improving the efficiency of the grinding process; not only that, the workpiece is supported by the bottom of the positioning groove on the first positioning piece, and the bottoms of the positioning grooves are located on the same horizontal plane, so that the grinding surface of the workpiece after clamping can also be kept horizontal, so that the workpiece has a better flatness after grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a stable grinding fixture provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the three-dimensional structure of a chassis provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the bottom structure of the first positioning member provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the three-dimensional structure of an eccentric locking member provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the top view of the structure of the stable grinding fixture when the positioning member provided in an embodiment of the present application is adjusted to the maximum position;

[0023] Figure 6 A schematic diagram of the cross-sectional structure of a stable grinding fixture provided in an embodiment of the present application when clamping a relatively large workpiece;

[0024] Figure 7 A schematic diagram of the top view of the structure of the stable grinding fixture when the positioning member provided in the embodiment of the present application is adjusted to a smaller position;

[0025] Figure 8 This is a schematic diagram of the cross-sectional structure of the stable grinding fixture provided in an embodiment of the present application when clamping a smaller workpiece.

[0026] The figures are marked as follows: 1-chassis, 110-sliding groove, 111-first positioning hole, 112-groove, 2-positioning piece, 210-first positioning piece, 211-positioning groove, 220-sliding block, 221-second positioning hole, 222-positioning protrusion, 230-second positioning piece, 3-eccentric locking piece, 310-eccentric screw, 311-eccentric part, 312-connecting part, 320-pressing block, 330-operating rod. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0028] Please refer to the attached Figure 1-8 The embodiment of the present application provides a stable grinding fixture, including a chassis 1, at least four positioning members 2 are arranged on the top of the chassis 1 along the circumferential direction, each positioning member 2 is movably positioned on the chassis 1 along the radial direction of the chassis 1, and the positioning member 2 includes a first positioning member 210 and a second positioning member 230. The top of the first positioning member 210 is concave downward to form a positioning groove 211 on one side close to the center of the chassis 1, the bottom of the positioning groove 211 is used to support the bottom surface of the workpiece, the groove wall of the positioning groove 211 is used to abut the side wall of the workpiece, and the top of the second positioning member 230 is rotated The eccentric locking member 3 is dynamically connected; when the stable grinding fixture clamps the workpiece, the position of the positioning member 2 is adjusted toward the center of the chassis 1 until the bottom surface of the workpiece is supported by the bottom of the positioning groove 211, the side wall of the workpiece abuts against the groove wall of the positioning groove 211, and the side wall of the eccentric locking member 3 with a narrower thickness abuts against the side wall of the workpiece, and the eccentric locking member 3 is rotated in the locking direction, and the side wall of the eccentric locking member 3 with a wider thickness rotates toward the center of the chassis 1 and pushes the side wall of the workpiece, so that the workpiece is clamped between the eccentric locking member 3 and the positioning groove 211.

[0029] In this embodiment, the workpiece is clamped together by multiple positioning members 2 circumferentially arranged on the chassis 1, so that the workpiece is subjected to the clamping force of the multiple positioning members 2, and a positioning groove 211 is recessed on the first positioning member 210, and the side wall and bottom surface of the workpiece fit the groove wall and groove bottom of the positioning groove 211, so that the contact surface between the first positioning member 210 and the workpiece is larger, so that the clamping force on the workpiece is more uniform, thereby effectively avoiding deformation of the workpiece due to uneven clamping force; and after the workpiece is initially fixed by multiple positioning members 2, the eccentric locking member 3 on the second positioning member 230 is twisted, and the side wall of the wider side of the eccentric locking member 3 rotates toward the center of the chassis 1 and pushes The side wall of the workpiece is thereby clamped between the eccentric locking member 3 and the positioning groove 211. When the workpiece needs to be removed, the eccentric locking member 3 is rotated in the opposite direction to rotate the side wall of the eccentric locking member 3 on the wider side outward and release the workpiece, so that the workpiece can be freely removed; thus, by adjusting the eccentric locking member 3, the workpiece can be easily clamped or released, making the loading and unloading operations of the workpiece simpler and improving the efficiency of the grinding process; not only that, the workpiece is supported by the bottom of the positioning groove 211 on the first positioning member 210, and the bottoms of the positioning grooves 211 are located on the same horizontal plane, so that the grinding surface of the workpiece after clamping can also be kept horizontal, so that the workpiece has a better flatness after grinding.

[0030] Among them, a positioning groove 211 can also be opened on the second positioning member 230, and the positioning groove 211 is opened on the side of the top of the second positioning member 230 close to the center of the chassis 1, and the eccentric locking member 3 is arranged on the end surface of the top of the second positioning member 230 protruding relative to the positioning groove 211, so that when the workpiece is attached to the positioning groove 211 on the second positioning member 230, the side wall of the eccentric locking member 3 still abuts against the side wall of the workpiece, and the workpiece can be clamped or loosened by rotating the eccentric locking member 3.

[0031] In some embodiments of the present application, the positioning member 2 and the chassis 1 are connected via a sliding assembly, which includes a sliding groove 110 radially distributed along the chassis 1 and a sliding block 220 slidably matched with the sliding groove 110, the sliding groove 110 is arranged on one of the positioning member 2 and the chassis 1, and the sliding block 220 is arranged on the other of the positioning member 2 and the chassis 1.

[0032] In this embodiment, by providing a sliding assembly, not only the connection between the positioning member 2 and the chassis 1 is made more stable, but also when the position of the positioning member 2 is adjusted, the positioning member 2 is guided by the sliding groove 110 to ensure that it moves along the radial direction of the chassis 1, making the adjustment operation of the positioning member 2 easier.

[0033] In some embodiments of the present application, the sliding groove 110 is provided on the chassis 1, and a plurality of first positioning holes 111 are provided on the sliding groove 110. The positioning member 2 is provided with a second positioning hole 221 in a vertical direction, and the first positioning hole 111 and the second positioning hole 221 are fixed in series by screws. The positioning member 2 and the chassis 1 are connected and fixed by screws, so that when the workpiece is clamped, the connection between the positioning member 2 and the chassis 1 is stable, and it is also convenient to remove the positioning member 2 from the chassis 1 for repositioning.

[0034] In other embodiments of the present application, the sliding groove 110 can also be arranged on the bottom surface of the positioning member 2, and a first positioning hole 111 is provided through the bottom of the sliding groove 110, and a strip-shaped sliding block 220 is provided on the chassis 1 along the radial direction of the chassis 1, and a plurality of second positioning holes 221 are provided at the top of the sliding block 220, so that the positioning member 2 can slide along the sliding block 220 while being fixed to the sliding block 220 by screws.

[0035] In some embodiments of the present application, nine first positioning holes 111 are provided on the sliding groove 110 along the direction in which the sliding groove 110 is provided. By providing nine first positioning holes 111, the positioning member 2 can be fixed at nine different positions, so that the grinding fixture can adapt to more workpieces of different sizes, thereby improving the practicality of the grinding fixture.

[0036] In some embodiments of the present application, a positioning assembly is also provided between the positioning member 2 and the sliding groove 110, and the positioning assembly includes a positioning protrusion 222 and a groove 112 that is snap-fitted with the positioning protrusion 222, the positioning protrusion 222 is provided in one of the sliding block 220 and the sliding groove 110, and the groove 112 is provided in the other of the sliding block 220 and the sliding groove 110.

[0037] In this embodiment, the positioning protrusion 222 and the groove 112 are respectively arranged at the relative positions of the first positioning hole 111 and the second positioning hole 221, so that when the positioning protrusion 222 and the groove 112 are snap-fitted, the first positioning hole 111 is aligned with the second positioning hole 221, so that the user can screw in the screws to fix the positioning member 2 on the chassis 1.

[0038] Preferably, the positioning protrusion 222 protrudes from the position where the second positioning hole 221 is opened at the lower end of the sliding block 220, and the groove 112 is set at the position where the first positioning hole 111 is opened on the sliding groove 110, so as to facilitate the docking and fixing of the positioning member 2 and the base 1. Of course, in other embodiments of the present application, the positioning protrusion 222 can also protrude from the sliding groove 110, and the groove 112 can be set at the lower end of the sliding block 220.

[0039] In some embodiments of the present application, eight sliding grooves 110 are provided on the chassis 1, and the angle between two adjacent sliding grooves 110 is 45°. Therefore, eight positioning members 2 can be provided on the chassis 1 to clamp the workpieces, and the spacing between any two adjacent workpieces is equal, so that the clamping force on the workpieces is more uniform.

[0040] In some embodiments of the present application, the second positioning member 230 is disposed in two symmetrical sliding grooves 110 on the left and right sides of the chassis 1. Therefore, when the workpiece is clamped by the positioning member 2, both the left and right sides of the workpiece are pushed by the eccentric locking member 3, and the directions of the two clamping forces on the workpiece are symmetrical to each other, so that the clamping force on the workpiece is more uniform, and the workpiece can not only be clamped more stably between the positioning members 2, but also not easily deformed due to uneven force.

[0041] Of course, in other embodiments of the present application, only one second positioning member 230 may be provided on the chassis 1, and the workpiece may be locked by only one eccentric locking member 3. The number of second positioning members 230 on the chassis 1 may also be three, four, and so on.

[0042] In some embodiments of the present application, the eccentric locking member 3 includes an eccentric screw 310, which includes an eccentric portion 311 and a connecting portion 312 that are bent and connected to each other. The connecting portion 312 is screwed to the second positioning member 230 and can rotate relative to the second positioning member 230. A pressure block 320 is sleeved on the eccentric portion 311. When the eccentric screw 310 rotates, the pressure block 320 pushes or loosens the workpiece.

[0043] In this embodiment, the eccentric locking member 3 performs eccentric movement through the eccentric screw 310 screwed to the second positioning member 230, which not only allows the eccentric locking member 3 to be rotated and adjusted with the help of the eccentric screw 310; and when the eccentric locking member 3 pushes the workpiece, it will be subjected to a reaction force from the workpiece. Since the eccentric screw 310 and the second positioning member 230 are screwed and fixed, the eccentric screw 310 is not easy to rotate after being subjected to the reaction force, thereby allowing the eccentric locking member 3 to stably clamp the workpiece and avoid the workpiece from being detached from the grinding fixture due to the rotation of the eccentric locking member 3.

[0044] In some embodiments of the present application, the pressure block 320 is an elastic member, so that the pressure block 320 applies elastic pushing to the workpiece, thereby preventing the workpiece from being subjected to the clamping force from the pressure block 320, thereby preventing the side wall of the workpiece from being worn due to friction between the pressure block 320 and the pressure block 320, thereby providing better protection for the workpiece.

[0045] The material of the pressing block 320 includes but is not limited to nylon, rubber, polyester, etc. Preferably, in this embodiment, the pressing block 320 is made of nylon, which not only has good elasticity and is not easy to wear the workpiece when clamping the workpiece, but also has good strength and wear resistance, so that the pressing block 320 itself is not easy to wear and has a long service life.

[0046] In some embodiments of the present application, an operating rod 330 protrudes from the side wall of the eccentric locking member 3. By providing the operating rod 330, the user can adjust the rotation direction of the eccentric locking member 3 by turning the operating rod 330, making the operation of adjusting the eccentric locking member 3 easier and more labor-saving.

[0047] The operating rod 330 passes through the pressing block 320 and is fixed to the side wall of the eccentric portion 311, so that the operating rod 330 directly controls the rotation of the eccentric screw 310, making the connection between the two more stable. If the operating rod 330 is fixed to the pressing block 320, since the pressing block 320 is made of elastic material, the force applied to the operating rod 330 cannot be effectively transmitted to the eccentric screw 310, resulting in more laborious use of the operating rod 330.

[0048] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means more than three.

[0049] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A stable grinding fixture, characterized in that: The invention comprises a chassis (1), wherein at least four positioning members (2) are arranged at the top of the chassis (1) along the circumferential direction, each of the positioning members (2) is movably positioned on the chassis (1) along the radial direction of the chassis (1), the positioning members (2) comprising a first positioning member (210) and a second positioning member (230), the top of the first positioning member (210) being close to the center of the chassis (1) and recessed downward to form a positioning groove (211), the bottom of the positioning groove (211) being used to support the bottom surface of a workpiece, the groove wall of the positioning groove (211) being used to abut against the side wall of the workpiece, the top of the second positioning member (230) being rotatably connected to an eccentric locking member (330) ); when the stable grinding fixture clamps the workpiece, the position of the positioning member (2) is adjusted toward the center of the chassis (1) until the bottom surface of the workpiece is supported by the bottom of the positioning groove (211), the side wall of the workpiece abuts against the groove wall of the positioning groove (211), and the side wall of the eccentric locking member (3) with a narrower thickness abuts against the side wall of the workpiece, and the eccentric locking member (3) is rotated in the locking direction, and the side wall of the eccentric locking member (3) with a wider thickness rotates toward the center of the chassis (1) and pushes the side wall of the workpiece, so that the workpiece is clamped between the eccentric locking member (3) and the positioning groove (211).

2. The stable grinding fixture according to claim 1, characterized in that: The positioning member (2) and the chassis (1) are connected via a sliding assembly, the sliding assembly comprising a sliding groove (110) distributed radially along the chassis (1) and a sliding block (220) slidably matched with the sliding groove (110), the sliding groove (110) being arranged on one of the positioning member (2) and the chassis (1), and the sliding block (220) being arranged on the other of the positioning member (2) and the chassis (1).

3. The stable grinding fixture according to claim 2, characterized in that: The sliding groove (110) is arranged on the chassis (1), a plurality of first positioning holes (111) are provided on the sliding groove (110), a second positioning hole (221) is provided through the positioning member (2) in a vertical direction, and the first positioning holes (111) and the second positioning holes (221) are fixed in series by screws.

4. The stable grinding fixture according to claim 3, characterized in that: Along the opening direction of the sliding groove (110), nine first positioning holes (111) are opened on the sliding groove (110).

5. The stable grinding fixture according to claim 2, characterized in that: A positioning component is also provided between the positioning member (2) and the sliding groove (110), the positioning component comprising a positioning protrusion (222) and a groove (112) snap-fitted with the positioning protrusion (222), the positioning protrusion (222) being provided on one of the sliding block (220) and the sliding groove (110), and the groove (112) being provided on the other of the sliding block (220) and the sliding groove (110).

6. The stable grinding fixture according to claim 2, characterized in that: The chassis (1) is provided with eight sliding grooves (110), and the angle between two adjacent sliding grooves (110) is 45°.

7. The stable grinding fixture according to claim 6, characterized in that: The second positioning member (230) is arranged at two symmetrical positions of the sliding grooves (110) on the left and right sides of the chassis (1).

8. The stable grinding fixture according to claim 1, characterized in that: The eccentric locking member (3) comprises an eccentric screw (310), wherein the eccentric screw (310) comprises an eccentric portion (311) and a connecting portion (312) which are connected by bending, wherein the connecting portion (312) is screwed to the second positioning member (230) and can rotate relative to the second positioning member (230), and a pressure block (320) is sleeved on the eccentric portion (311), and when the eccentric screw (310) rotates, the pressure block (320) pushes or releases the workpiece.

9. The stable grinding fixture according to claim 8, characterized in that: The pressing block (320) is an elastic member.

10. The stable grinding fixture according to claim 1, characterized in that: An operating rod (330) protrudes from the side wall of the eccentric locking member (3).

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