Positioning jig

Abstract

The utility model relates to the technical field of structure assembly, in particular to a positioning jig which comprises a base, a positioning seat and a positioning column, and a jacking piece is arranged on the matching face of the base in a protruding mode. The positioning seat is arranged on the matching surface of the base; a profiling positioning protrusion is arranged on the side, back on to the base, of the positioning seat in a protruding mode, the positioning seat is provided with a limiting cavity, and the profiling positioning protrusion is provided with a limiting channel communicated with the limiting cavity. The positioning column is arranged in the limiting channel and the limiting channel and abuts against the jacking piece, the positioning column and the positioning base are coaxially arranged, a limiting block is arranged on the outer circumferential face of the positioning column and abuts against the inner bottom wall of the limiting cavity, the profiling positioning protrusion is used for installing and fixing the rear shell, and the positioning column is arranged in the limiting channel and the limiting channel and abuts against the jacking piece. The positioning column is used for installing and fixing the control button. According to the technical scheme of the utility model, the coaxiality of assembled products is improved so as to reduce the problem of poor assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of structural assembly, in particular to a positioning jig. Background Art

[0002] In some electronic products, such as TWS (True Wireless Stereo) headphones, they will include a back shell and control buttons that need to be assembled. During the assembly process of the back shell and the control button, there are two steps: positioning and pressure holding. First, the back shell and the control button are assembled together in the positioning stage to ensure that the form and position tolerances of the back shell and the control button (for example, the back shell has a circular receiving groove, the control button is set as a circular sheet structure, and the control button is set in the receiving groove. At this time, the form and position tolerance between the back shell and the control button is mainly the coaxiality tolerance) are within the limit tolerance, and then the back shell and the control button are fixed together using an adhesive medium (such as an adhesive) in the pressure holding stage.

[0003] In related technologies, the assembly between the back shell and the control buttons of TWS is mostly manual. At this time, the coaxiality between the two cannot be accurately judged by the naked eye, and the actual tolerance between the back shell and the control buttons cannot be guaranteed to be within the limit tolerance range, which easily leads to poor assembly problems due to coaxiality deviation. Utility Model Content

[0004] The main purpose of the utility model is to provide a positioning jig, which aims to improve the coaxiality of assembled products and reduce the problem of poor assembly.

[0005] To achieve the above objectives, the positioning fixture proposed in the present invention includes:

[0006] A base, wherein a jacking piece is convexly provided on a mating surface of the base;

[0007] A positioning seat, the positioning seat being arranged on the mating surface of the base; a contoured positioning protrusion being provided on a side of the positioning seat facing away from the base, the positioning seat being provided with a limiting cavity, and the contoured positioning protrusion being provided with a limiting channel communicating with the limiting cavity; and

[0008] a positioning post, the positioning post being arranged in the limiting cavity and the limiting channel and abutting against the lifting member, the positioning post and the positioning seat being coaxially arranged, a limiting block being provided on the outer circumference of the positioning post, and the limiting block abutting against the inner bottom wall of the limiting cavity;

[0009] The contoured positioning protrusion is used to install and fix the rear shell, and the positioning column is used to install and fix the control button.

[0010] In one embodiment of the present invention, the positioning seat includes a first positioning platform and a second positioning platform, and the first positioning platform and the second positioning platform are detachably connected; the first positioning platform and the second positioning platform are stacked and enclosed to form the limiting cavity, the first positioning platform is provided with the contoured positioning protrusion, and the positioning column is gap-fitted with the limiting channel.

[0011] In one embodiment of the present utility model, the positioning column includes a limiting section and an abutting section, the limiting section is movably arranged in the limiting channel, the abutting section is movably arranged in the limiting cavity, and the limiting block is arranged in the abutting section; the limiting section is provided with a slot, and an insertion arm is protruding from the end of the abutting section, and the insertion arm is inserted into the slot.

[0012] In an embodiment of the present invention, the limiting block is uniformly protruded along the radial direction of the abutting section, so that the limiting block forms a ring structure.

[0013] In an embodiment of the present invention, the limiting block is provided at an end of the abutting section away from the lifting member, and the limiting block can abut against an inner top wall of the limiting cavity.

[0014] In one embodiment of the present invention, a limiting hole communicating with the limiting cavity is provided at the bottom of the second positioning platform, the limiting hole is coaxially arranged with the limiting channel, the lifting member passes through the limiting hole and abuts against the positioning column; the lifting member is provided with a positioning guide section, the cross-sectional area of ​​the positioning guide section gradually decreases from one end connected to the mating surface of the base to the end away from the mating surface of the base, and the limiting hole is provided with a first hole section adapted to the positioning guide section.

[0015] In one embodiment of the present utility model, the lifting member is provided with an abutment positioning section, and the abutment positioning section is provided at one end of the positioning guide section away from the mating surface of the base. The cross-section of the abutment positioning section is the same as the cross-section of the end of the positioning guide section away from the mating surface of the base, and the limiting hole is provided with a second hole section adapted to the abutment positioning section.

[0016] In one embodiment of the present invention, the mating surface of the base is provided with a plurality of lifting members, the plurality of lifting members are arranged at intervals, each of the lifting members is aligned with one of the positioning columns, and each of the positioning columns is aligned with one of the contoured positioning protrusions.

[0017] In one embodiment of the present invention, the base includes a rotating plate and a supporting seat, the rotating plate is rotatably connected to the supporting seat; the rotating plate is provided with the matching surface.

[0018] In one embodiment of the present invention, the rotating plate is provided with a plurality of limiting cofferdams facing away from the support seat, and the plurality of limiting cofferdams enclose a limiting space, and the first positioning platform and the second positioning platform are located in the limiting space and abut against the limiting cofferdams.

[0019] In the technical solution of the present invention, the back shell and control button to be assembled of the electronic product are respectively placed on the contoured positioning protrusion and the positioning column, and then the positioning seat is moved upward as a whole to complete the assembly of the back shell and the control button; the upward movement mainly includes two stages that occur in sequence. In the first stage, the contoured positioning protrusion moves upward together with the positioning seat. In this stage, there is no constraint between the positioning column and the limiting cavity and the limiting channel, and it does not move upward together with the positioning seat. The positioning column is located on the lifting part, and the back shell placed on the contoured positioning protrusion is close to the control button on the positioning column; after moving up a certain distance, it enters the second stage, and the limiting block on the positioning column abuts against the inner bottom wall of the limiting cavity. At this time, the back shell placed on the contoured positioning protrusion and the control button on the positioning column complete the positioning assembly, and the subsequent positioning seat drives the back shell and the control button to move together into the pressure holding process to fix the two together. During the positioning assembly process, because the positioning column and the contoured positioning protrusion are coaxially arranged, the coaxiality tolerance of the back shell placed on the contoured positioning protrusion and the control button on the positioning column is ensured to be within the limit tolerance range, reducing assembly problems between the back shell and the control button caused by the coaxiality tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the positioning fixture provided by the present utility model;

[0022] Figure 2 for Figure 1 Structural explosion diagram;

[0023] Figure 3 for Figure 1 sectional view of .

[0024] Description of Figure Numbers:

[0025] 10. Base; 101. Rotating plate; 102. Support seat; 103. Limiting cofferdam; 104. Lifting member; 105. Support arm; 106. Support plate; 107. Rotating block; 10a. Limiting arc groove; 108. Limiting rod; 1041. Positioning guide section; 1042. Abutting positioning section; 20. Positioning seat; 201. First positioning platform; 202. Second positioning platform; 20A. Limiting cavity; 203. Contoured positioning protrusion; 202a. Limiting hole; 30. Positioning column; 301. Limiting section; 302. Abutting section; 303. Limiting block; 30a. Slot; 304. Insert arm.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] Please refer to Figures 1 to 3 The positioning fixture proposed by the present invention includes:

[0031] The base 10 has a jacking member 104 convexly disposed on the mating surface of the base 10;

[0032] The positioning seat 20 is provided on the mating surface of the base 10; the positioning seat 20 has a contoured positioning protrusion 203 on the side facing away from the base 10, the positioning seat 20 has a limiting cavity 20A, and the contoured positioning protrusion 203 has a limiting channel communicating with the limiting cavity 20A; and

[0033] The positioning column 30 is disposed in the limiting cavity 20A and the limiting channel and abuts the lifting member 104. The positioning column 30 and the positioning seat 20 are coaxially arranged. The outer peripheral surface of the positioning column 30 is provided with a limiting block 303, which abuts the inner bottom wall of the limiting cavity 20A.

[0034] The contoured positioning protrusion 203 is used to install and fix the rear shell, and the positioning column 30 is used to install and fix the control button.

[0035] When the rear shell and the control button are assembled, they are respectively placed on the contoured positioning protrusion 203 and the positioning column 30, and then the positioning seat 20 is moved upward as a whole to complete the assembly of the rear shell and the control button. The upward movement mainly includes two stages that occur in sequence. In the first stage, the contoured positioning protrusion 203 moves upward with the positioning seat 20. During this stage, there is no constraint between the positioning column 30 and the limiting cavity 20A and the limiting channel, and the positioning column 30 does not move upward with the positioning seat 20. The positioning column 30 is located on the lifting member 104, and the rear shell placed on the contoured positioning protrusion 203 is close to the control button on the positioning column 30. After moving up a certain distance, the second stage is entered, and the limiting block 303 on the positioning column 30 abuts against the inner bottom wall of the limiting cavity 20A. At this time, the rear shell placed on the contoured positioning protrusion 203 and the control button on the positioning column 30 complete the positioning assembly. Subsequently, the positioning seat 20 drives the rear shell and the control button to move together and enter the pressure holding process to fix the two together. During the positioning and assembly process, because the positioning column 30 and the contoured positioning protrusion 203 are coaxially arranged, the coaxiality tolerance of the rear shell placed on the contoured positioning protrusion 203 and the control button on the positioning column 30 is ensured to be within the limit tolerance range, reducing the assembly problems between the rear shell and the control button caused by the coaxiality tolerance.

[0036] In one embodiment, the base 10 can be confirmed to be a metal part or a plastic part according to actual needs. For example, when the base 10 needs to be a metal part, the base 10 and the lifting part 104 can be made into an integrated structure through a die-casting process, or the base 10 and the lifting part 104 can be made into an integral plastic part through an injection molding process, which is not limited here; it can be understood that the mating surface of the base 10 refers to the working surface on the base 10 used to support the positioning seat 20 so that the back shell and the control button can be positioned and assembled. The mating surface can be smoothed to avoid the entire positioning seat 20 from tilting when the positioning seat 20 is placed on the mating surface, thereby preventing the coaxiality between the assembled back shell and the control button from being reduced; further, a pre-set screw hole is provided at the bottom of the base 10, and the base 10 is fixed to the assembly station by using fasteners such as bolts.

[0037] The positioning seat 20 is movably arranged on the matching surface of the base 10, and a limiting hole 202a is provided on one side of the contact surface where the positioning seat 20 abuts the assembly surface of the base 10. After the positioning fixture is assembled, the lifting piece 104 of the base 10 is inserted into the limiting hole 202a of the positioning seat 20; a contoured positioning protrusion 203 is convexly provided on the side of the positioning seat 20 facing away from the base 10. The contoured positioning protrusion 203 can be adaptively designed according to the shell to be assembled. In this technical solution, no shape limitation is made. The contoured positioning protrusion 203 can be made into an integral structure with the positioning seat 20 through the process mentioned above. When assembling the rear shell and the control button, the rear shell is placed on the contoured positioning protrusion 20 3 and a transition fit can be adopted between the positioning seat 20 and the contoured positioning protrusion 203, and a slight pressure is applied to the rear shell so that the rear shell can be fixed on the contoured positioning protrusion 203 to prevent the rear shell from loosening; the lower structure of the positioning seat 20 close to the base 10 is provided with a limiting cavity 20A, the limiting hole 202a is connected to the limiting cavity 20A, and the contoured positioning protrusion 203 is provided with a limiting channel connected to the limiting cavity 20A, so that the positioning seat 20 forms a positioning space for the positioning column 30 to move from the side away from the base 10 to the side close to the base 10. The positioning column 30 can pass through the limiting channel and the limiting cavity 20A in sequence to abut against the lifting member 104 to complete the position limitation.

[0038] The positioning column 30 is used to install a fixed control button; the end of the positioning column 30 away from the lifting member 104 forms a profiling structure, and the profiling structure can be adaptively designed according to the shape of the control button. The shape of the part of the structure of the positioning column 30 that moves back and forth in the limiting channel is adapted to the shape of the limiting channel. In this embodiment, the cross-sectional shape of the limiting channel and the positioning column 30 are both square. Of course, they can be set to a circular shape or other shapes according to actual production means, which is not limited here; further, in order to prevent the positioning column 30 from passing through the limiting channel, the limiting cavity 20A and the limiting hole 202a in sequence Then, it will detach from the positioning seat 20. A limiting block 303 is provided on the outer peripheral surface of the partial structure of the positioning column 30 located in the limiting cavity 20A. The limiting block 303 and the positioning column 30 are an integrated structure. The cross-sectional dimensions of the positioning column 30 and the limiting block 303 are both larger than the cross-sectional dimensions of the limiting hole 202a and the limiting channel. In this way, when the positioning seat 20 has not yet been assembled with the base 10, the positioning column 30 will not detach from the positioning seat 20 when moving back and forth in the limiting channel and the limiting cavity 20A. It can be understood that the limiting block 303 can be a ring structure or a square structure, which is not limited here.

[0039] It is understandable that when assembling the base 10 and the positioning seat 20, the lifting member 104 will lift the positioning column 30 a certain distance so that the contour structure of the positioning column 30 is completely exposed in the limiting channel, so that the control button can be fixedly placed on the contour structure.

[0040] See also Figure 2 and Figure 3In one embodiment, the positioning seat 20 includes a first positioning platform 201 and a second positioning platform 202. The first positioning platform 201 and the second positioning platform 202 are stacked and enclosed to form a limiting cavity 20A. The first positioning platform 201 is provided with a contoured positioning protrusion 203, and the second positioning platform 202 abuts the mating surface of the base 10; the second positioning platform 202 is a plate-shaped structure adapted to the mating surface of the base 10. The bottom of the first positioning platform 201 is a flat shape adapted to the second positioning platform 202, and the top is an inclined shape adapted to the contoured positioning protrusion 203. The inclined shape is not specifically limited here. A plurality of first bolt pre-setting holes are provided in the area of ​​the first positioning platform 201 avoiding the limiting hole 202a, and the second positioning platform 202 is provided with a second bolt pre-setting hole aligned with the first bolt pre-setting hole. The first and second positioning platforms 201 and 202 are fixed with bolts. Of course, a locking structure can also be set on the side walls of the first and second positioning platforms 201 and 202 for fixing. This is not limited here. It can be understood that the bolt structure or the locking structure are both used to realize the detachable connection between the first and second positioning platforms 201 and 202, so that the positioning column 30 can be assembled into the limiting channel and the limiting cavity 20A; further, in order to realize that the positioning column 30 can move back and forth in the positioning seat 20 under the action of its own weight, the positioning column 30 is matched with the limiting channel gap, and there is a small gap between the positioning column 30 and the inner wall of the limiting channel, and it can prevent the positioning column 30 from deviating from the contoured positioning protrusion 203.

[0041] In order to facilitate the production of the positioning column 30 and reduce the difficulty of producing the positioning column 30, the positioning column 30 is set to a segmented structure. Figure 3 The positioning column 30 includes a limiting section 301 and an abutting section 302. The limiting section 301 is movably arranged in the limiting channel, the abutting section 302 is movably arranged in the limiting cavity 20A, and the limiting block 303 is arranged in the abutting section 302. In order to achieve a tight connection between the limiting section 301 and the abutting section 302, a slot 30a is provided at one end of the limiting section 301 facing the lifting member 104, and an insert arm 304 is protruded at one end of the abutting section 302 facing away from the lifting member 104. The insert arm 304 is inserted into the slot 30a to assemble into the positioning column 30.

[0042] Furthermore, the abutment section 302 is set to a cylindrical shape, and the limit block 303 is uniformly protruded along the radial direction of the abutment section 302 so that the limit block 303 forms an annular structure. In this way, the contact area with the inner bottom wall of the limit cavity 20A can be increased and the abutment can be uniformly achieved, so as to improve the stability and reliability of the positioning column 30 seated on the lifting member 104.

[0043] In one embodiment, the limit block 303 is provided at one end of the abutting section 302 away from the lifting member 104, and the limit block 303 can abut against the inner top wall of the limiting cavity 20A. In this way, after the positioning fixture is assembled, the positioning column 30 abuts against both the lifting member 104 and the inner top wall of the limiting cavity 20A, so as to jointly improve the stability and reliability of the positioning column 30. In addition, the maximum distance between the limit block 303 and the inner bottom wall of the limiting cavity 20A is the height of the protruding contoured positioning protrusion 203 of the positioning column 30. Under the lifting action of the lifting member 104, the limiting is completed to facilitate the installation of the control button.

[0044] Please continue reading Figures 1 to 3 , a limiting hole 202a communicating with the limiting cavity 20A is provided at the bottom of the second positioning platform 202, and the limiting hole 202a is coaxially arranged with the limiting channel, and the lifting member 104 passes through the limiting hole 202a and abuts the positioning column 30, so that the positioning column 30 can evenly abut the lifting member 104 to prevent the positioning column 30 from tilting; in order to facilitate the assembly of the second positioning platform 202 and the base 10, the lifting member 104 is provided with a positioning guide section 1041, and the cross-sectional area of ​​the positioning guide section 1041 gradually decreases from one end connected to the mating surface of the base 10 to the end away from the mating surface of the base 10, and the limiting hole 202a is provided with The first hole section of the positioning guide section 1041 is adapted so that when the positioning seat 20 is placed as a whole on the mating surface of the base 10, the flared limiting hole 202a can accommodate the positioning guide section 1041 to avoid position interference, and the two adapted structures of the positioning guide section 1041 and the first hole section can be utilized. When the positioning seat 20 is placed, the outer surface of the positioning guide section 1041 can play a guiding role, thereby correcting the position of the positioning seat 20 relative to the base 10, so that the limiting hole 202a is coaxially arranged with the lifting member 104, thereby ensuring that the positioning column 30 can evenly abut the lifting member 104.

[0045] Furthermore, the lifting member 104 is provided with an abutting positioning section 1042, which is provided at one end of the positioning guide section 1041 away from the mating surface of the base 10, and the cross-section of the abutting positioning section 1042 is the same as the cross-section of the end of the positioning guide section 1041 away from the mating surface of the base 10, and the limiting hole 202a is provided with a second hole section adapted to the abutting positioning section 1042. In this way, even if the cross-sectional shape of the positioning guide section 1041 changes, the contact area between the lifting member 104 and the abutting section 302 of the positioning column 30 will not be reduced, thereby improving the stability and reliability of the positioning column 30.

[0046] In one embodiment, in order to improve the assembly positioning efficiency of the back shell and the control button and the pressure holding efficiency of the subsequent pressure holding process, the mating surface of the base 10 is provided with a plurality of lifting members 104, each lifting member 104 is aligned with a positioning column 30, and each positioning column 30 is aligned with a contoured positioning protrusion 203. The plurality of lifting members 104 can be arranged at intervals along the length of the mating surface of the base 10, or the plurality of lifting members 104 can be evenly arranged around the outer edge of the base 10. It can be understood that the specific arrangement of the lifting members 104 can be adapted according to the arrangement of the pressure holding heads of the pressure holding machine, so that each pressure holding head can pressurize a group of back shells and control buttons.

[0047] Please continue reading Figures 1 to 3 The base 10 includes a rotating plate 101 and a support base 102. The rotating plate 101 is rotatably connected to the support base 102. The rotating plate 101 is provided with a mating surface. Specifically, the support base 102 includes two support arms 105 and a support plate 106. The support plate 106 is fixed to the assembly station by using fasteners such as bolts. The two support arms 105 are arranged opposite to each other on the support plate 106. A rotating block 107 is provided between the two support arms 105. The two support arms 105 and the rotating block 107 are connected by a rotating shaft to realize the rotation of the rotating block 107. The rotating plate 101 can be welded or screwed. On the side of the rotating block 107 facing away from the support plate 106, the assembler can rotate the rotating plate 101 to place the back cover and the control button at different angles; further, each support arm 105 is provided with a limit arc groove 10a for limiting the maximum rotation angle, and limit rods 108 are provided at both ends of the rotating block 107, and the limit rods 108 are inserted into the limit arc groove 10a. In this way, when the limit rod 108 abuts against the end of the limit arc groove 10a, the rotation stop is achieved to prevent the rotating plate 101 from rotating too much, causing the back cover and the control button to fall off the contoured positioning protrusion 203 and the positioning column 30.

[0048] In order to improve the alignment between the limiting hole 202a of the positioning seat 20 and the lifting member 104 when assembling the positioning fixture, as shown in FIG. Figure 1 and Figure 2 As shown, the mating surface of the base 10 is provided with a plurality of limiting cofferdams 103, and the plurality of limiting cofferdams 103 enclose a limiting space, and the first positioning platform 201 and the second positioning platform 202 are located in the limiting space. In this way, when the positioning seat 20 is placed in the limiting space, the spacing between the positioning seat 20 and the limiting cofferdam 103 can be judged to determine whether the limiting holes 202a and the lifting parts 104 are aligned one by one. It can be understood that any two adjacent limiting cofferdams 103 can be connected to each other, or multiple limiting cofferdams 103 can be independently arranged at the corners of the mating surface, as long as the positioning seat 20 can abut against the limiting cofferdam 103. No specific limitation is made here.

[0049] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A positioning jig for assembling a rear housing and a control button, characterized in that: The positioning fixture includes: A base (10), wherein a jacking piece (104) is convexly provided on a mating surface of the base (10); A positioning seat (20), the positioning seat (20) being arranged on a matching surface of the base (10); a contoured positioning protrusion (203) being convexly arranged on a side of the positioning seat (20) facing away from the base (10); the positioning seat (20) being provided with a limiting cavity (20A); and the contoured positioning protrusion (203) being provided with a limiting channel communicating with the limiting cavity (20A); and A positioning column (30), the positioning column (30) is arranged in the limiting cavity (20A) and the limiting channel, and abuts against the lifting member (104), the positioning column (30) and the contoured positioning protrusion (203) are coaxially arranged, and a limiting block (303) is provided on the outer peripheral surface of the positioning column (30), and the limiting block (303) abuts against the inner bottom wall of the limiting cavity (20A); Wherein, the contoured positioning protrusion is used to install and fix the rear shell, and the positioning column is used to install and fix the control button.

2. The positioning fixture according to claim 1, characterized in that: The positioning seat (20) comprises a first positioning platform (201) and a second positioning platform (202), wherein the first positioning platform (201) and the second positioning platform (202) are detachably connected; the first positioning platform (201) and the second positioning platform (202) are stacked and enclosed to form the limiting cavity (20A); the first positioning platform (201) is provided with the contoured positioning protrusion (203), and the second positioning platform (202) abuts against the matching surface of the base (10); the positioning column (30) is clearance-matched with the limiting channel.

3. The positioning fixture according to claim 2, characterized in that: The positioning column (30) comprises a limiting section (301) and an abutting section (302); the limiting section (301) is movably arranged in the limiting channel, the abutting section (302) is movably arranged in the limiting cavity (20A), and the limiting block (303) is arranged in the abutting section (302); the limiting section (301) is provided with a slot (30a), and an insert arm (304) is protrudingly provided at the end of the abutting section (302), and the insert arm (304) is inserted into the slot (30a).

4. The positioning fixture according to claim 3, characterized in that: The limiting block (303) protrudes uniformly along the radial direction of the abutting section (302), so that the limiting block (303) forms an annular structure.

5. The positioning fixture according to claim 3, characterized in that: The limiting block (303) is arranged at one end of the abutting section (302) away from the lifting member (104), and the limiting block (303) is capable of abutting against the inner top wall of the limiting cavity (20A).

6. The positioning fixture according to any one of claims 2 to 5, characterized in that: A limiting hole (202a) communicating with the limiting cavity (20A) is provided at the bottom of the second positioning platform (202); the limiting hole (202a) is coaxially arranged with the limiting channel; the lifting member (104) passes through the limiting hole (202a) and abuts against the positioning column (30); the lifting member (104) is provided with a positioning guide section (1041); the cross-sectional area of ​​the positioning guide section (1041) gradually decreases from one end connected to the mating surface of the base (10) to one end away from the mating surface of the base (10); the limiting hole (202a) is provided with a first hole section adapted to the positioning guide section (1041).

7. The positioning fixture according to claim 6, characterized in that: The lifting member (104) is provided with an abutment positioning section (1042), and the abutment positioning section (1042) is provided at one end of the positioning guide section (1041) away from the mating surface of the base (10), and the cross-section of the abutment positioning section (1042) is the same as the cross-section of the end of the positioning guide section (1041) away from the mating surface of the base (10), and the limiting hole (202a) is provided with a second hole section adapted to the abutment positioning section (1042).

8. The positioning fixture according to any one of claims 1 to 5, characterized in that: The mating surface of the base (10) is provided with a plurality of lifting members (104), the plurality of lifting members (104) are arranged at intervals, each of the lifting members (104) is aligned with a positioning column (30), and each of the positioning columns (30) is aligned with a contoured positioning protrusion (203).

9. The positioning fixture according to claim 2, characterized in that: The base (10) comprises a rotating plate (101) and a supporting seat (102); the rotating plate (101) is rotatably connected to the supporting seat (102); and the rotating plate (101) is provided with the matching surface.

10. The positioning fixture according to claim 9, characterized in that: The rotating plate (101) is provided with a plurality of limiting cofferdams (103) facing away from the supporting seat (102), and the plurality of limiting cofferdams (103) enclose a limiting space, and the first positioning platform (201) and the second positioning platform (202) are located in the limiting space and abut against the limiting cofferdams (103).

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