Positioning jig

Abstract

The utility model relates to the technical field of semiconductor production, and discloses a positioning jig which comprises a base, a plurality of limiting pieces and a locking assembly. The limiting piece comprises a connecting column, a limiting column and a check block, the connecting column is connected to the base, the limiting column is fixedly connected to the connecting column, the check block is provided with a first end and a second end which are opposite to each other, the first end is fixedly connected to the limiting column, and the second end is fixedly connected to the limiting column. The connecting column rotates to drive the second end to move between a first position and a second position; the locking assembly is respectively connected with the limiting piece and the base, and the locking assembly can lock the limiting piece so as to lock the second end at the first position; according to the positioning jig provided by the embodiment of the utility model, the substrate can be prevented from being separated from the positioning jig along the limiting column in the direction far away from the base through the stop block and the locking assembly, and the mounting stability of the substrate on the positioning jig is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor production, in particular to a positioning fixture. Background Art

[0002] In the production and processing technology of semiconductor materials, the substrate is also called the base plate, also called the supporting substrate; the substrate is mainly the substrate for epitaxial layer growth, and plays the role of support, fixation and material property matching in the production and manufacturing process; the positioning fixture is used to fix the substrate sheet in a specific position or posture during the manufacturing and processing process; most of the positioning fixtures in the prior art only realize the loading and positioning of the substrate sheet by setting a plurality of limit posts on the base and clamping the substrate sheet between the plurality of limit posts; however, since this positioning fixture does not have a blocking structure on the limit posts, the substrate sheet is easy to detach from the positioning fixture along the limit posts in the direction away from the base, affecting the installation stability of the substrate sheet. Utility Model Content

[0003] Aiming to solve at least one of the technical problems existing in the prior art, the utility model provides a positioning fixture which can improve the installation stability of the substrate.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a positioning fixture, having a first direction, the positioning fixture comprising a base, a plurality of limiting members and a locking assembly; the base has a reference line; a plurality of limiting members are distributed around the reference line, the limiting members comprise a connecting column, a limiting column and a stopper, the connecting column has a first axis, the connecting column is connected to the base and can rotate around the first axis, the limiting column is fixedly connected to one end of the connecting column away from the base in the first direction, the stopper has a first end and a second end opposite to each other, the first end is fixedly connected to one end of the limiting column away from the connecting column in the first direction, the connecting column rotates around the The rotation of the first axis can drive the second end to move between the first position and the second position; the locking assembly is respectively connected to the limit member and the base, and the locking assembly can lock the limit member to lock the second end in the first position; an installation space is defined between the plurality of limit columns, and the first direction is perpendicular to the first plane; when the second end is placed in the first position, along the first direction, the orthographic projection of the second end on the first plane is within the range of the installation space in the first plane; when the second end is placed in the second position, the orthographic projection of the second end on the first plane is outside the range of the installation space in the first plane.

[0005] In some embodiments, the first axis and the first direction are parallel.

[0006] In some embodiments, the limit member also includes a connecting block, which is fixedly connected to the connecting column; the locking assembly includes a first magnet and a second magnet, the first magnet is fixedly connected to the connecting block, and the second magnet is fixedly connected to the base and cooperates with the first magnet.

[0007] In some embodiments, the base includes a main body portion, a first mounting portion and a second mounting portion, the first mounting portion is fixedly connected to the outer wall of the main body portion, the first mounting portion is provided with a through hole that penetrates along the first direction and allows the connecting column to pass through, the second mounting portion is fixedly connected to the outer wall of the main body portion and is located on the side of the first mounting portion that is away from the stop block in the first direction; along the first direction, the connecting block is located between the first mounting portion and the second mounting portion; the second magnet is fixedly connected to one end of the second mounting portion in the first direction that is close to the first mounting portion.

[0008] In some embodiments, the positioning fixture further includes a pressing piece connected to the connecting block; wherein when the second end is placed in the first position, an outer side wall of the pressing piece is in contact with an outer side wall of the main body.

[0009] In some embodiments, the positioning fixture further includes a telescopic spring;

[0010] The connection block has an installation cavity inside, the telescopic spring is arranged in the installation cavity, the connection block has an installation hole connected with the installation cavity, and the pressing piece is connected with the telescopic spring through the installation hole.

[0011] In some embodiments, the pressing piece is a spherical structure, the mounting hole is a circular mounting hole, and the diameter of the pressing piece is larger than the aperture of the mounting hole.

[0012] In some embodiments, the radius of the connecting column is greater than the radius of the limiting column.

[0013] In some embodiments, the limiting member also includes a frustum, and the limiting column is fixedly connected to the connecting column via the frustum, the frustum has a first end face and a second end face relative to each other in the first direction, the radius of the first end face is smaller than the radius of the second end face, the limiting column is fixedly connected to the first end face, and the connecting column is fixedly connected to the second end face.

[0014] In some embodiments, the limiting column has a second axis, the cone has a third axis, the first axis, the second axis and the third axis coincide with each other, the radius of the connecting column is equal to the radius of the second end face, and the radius of the limiting column is equal to the radius of the first end face.

[0015] Compared with the prior art, a positioning fixture provided by the embodiment of the utility model has the following beneficial effects: by rotating the limiting member to move the second end of the stopper to the second position, the stopper can avoid the installation space in the first direction and form an installation channel for the substrate to enter and exit the installation space, so that the substrate can be loaded into the installation space through the installation channel along the first direction to complete the loading and positioning of the substrate; the limiting member is rotated to move the second end to the first position; since the positive projection of the second end on the first plane is located within the range of the first plane of the installation space, the stopper can block the movement of the substrate in the first direction to limit the movement of the substrate, so that the stopper can prevent the substrate from detaching from the positioning fixture along the limiting column in the direction away from the base, thereby improving the installation stability of the substrate; the second end can also be locked in the first position by the locking assembly, ensuring that the second end will be fixed in the first position without the action of external force and continue to play a role in blocking the substrate from leaving the positioning fixture, which helps to further improve the installation stability of the substrate; therefore, the positioning fixture provided by the utility model can prevent the substrate from detaching from the positioning fixture along the limiting column in the direction away from the base through the stopper and the locking assembly, thereby improving the installation stability of the substrate in the positioning fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a positioning fixture provided by an embodiment of the utility model;

[0017] Figure 2 This is a rendering of a positioning fixture provided by an embodiment of the utility model when a substrate is installed at a first position;

[0018] Figure 3 This is a rendering of the effect of a positioning fixture provided by an embodiment of the utility model when a substrate is installed at a second position;

[0019] Figure 4 It is a top view of a positioning fixture provided by an embodiment of the utility model in a first position;

[0020] Figure 5 It is a top view of a positioning fixture provided by an embodiment of the utility model in a first position;

[0021] Figure 6 It is a schematic diagram of the connection between the limiter and the telescopic spring provided in the embodiment of the utility model;

[0022] Figure 7 It is a cross-sectional schematic diagram of a limiting member provided in an embodiment of the utility model.

[0023] In the figure, 1, base; 11, main body; 12, first mounting portion; 13, second mounting portion; 110, reference line; 121, through hole;

[0024] 2. Limiting member; 21. Connecting column; 22. Limiting column; 23. Stopper; 24. Connecting block; 25. Round table; 26. Screw; 220. Installation space; 231. First end; 232. Second end; 241. Installation cavity; 242. Installation hole; 251. First end face; 252. Second end face;

[0025] 3. Locking assembly; 31. First magnet; 32. Second magnet;

[0026] 4. Pressing parts;

[0027] 5. Telescopic spring;

[0028] 6. Substrate;

[0029] 10, first axis; 20, second axis; 30, third axis;

[0030] Z, first direction. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] like Figure 1-7 As shown, a preferred positioning fixture of an embodiment of the utility model has a first direction Z, and the positioning fixture includes a base 1, a plurality of limit members 2 and a locking assembly 3.

[0037] The base 1 has a reference line 110; a plurality of limit members 2 are distributed around the reference line 110, the limit members 2 include a connecting column 21, a limit column 22 and a stopper 23, the connecting column 21 has a first axis 10, the connecting column 21 is connected to the base 1 and can rotate around the first axis 10, the limit column 22 is fixedly connected to one end of the connecting column 21 away from the base 1 in the first direction Z, the stopper 23 has a first end 231 and a second end 232 opposite to each other, the first end 231 is fixedly connected to one end of the limit column 22 away from the connecting column 21 in the first direction Z, and the connecting column 21 rotates around the first axis 10 to drive the second end 232 to rotate in the first direction Z. The locking assembly 3 is connected to the limit member 2 and the base 1 respectively, and the locking assembly 3 can lock the limit member 2 to lock the second end 232 in the first position; wherein, an installation space 220 is defined between a plurality of limit columns 22, and the first direction Z is perpendicular to the first plane; when the second end 232 is placed in the first position, along the first direction Z, the orthographic projection of the second end 232 on the first plane is located within the range of the installation space 220 in the first plane; when the second end 232 is placed in the second position, the orthographic projection of the second end 232 on the first plane is located outside the range of the installation space 220 in the first plane.

[0038] Based on this technical solution, by rotating the stopper 2 to move the second end 232 of the stopper 23 to the second position, the stopper 23 can avoid the installation space 220 in the first direction Z and form an installation channel for the substrate 6 to enter and exit the installation space 220, so that the substrate 6 can be loaded into the installation space 220 through the installation channel along the first direction Z to complete the loading and positioning of the substrate 6, and then the stopper 2 is rotated to move the second end 232 to the first position. Since the orthographic projection of the second end 232 on the first plane is located within the range of the installation space 220 on the first plane, the stopper 23 can block the movement of the substrate 6 in the first direction Z to limit the substrate 6 from moving. The movement of the bottom 6 can prevent the substrate 6 from escaping from the positioning fixture along the limiting column 22 in the direction away from the base 1 through the stop block 23, thereby improving the installation stability of the substrate 6, and can also lock the second end 232 in the first position through the locking assembly 3, ensuring that the second end 232 will be fixed in the first position in the absence of external force and continue to prevent the substrate 6 from leaving the positioning fixture, which helps to further improve the installation stability of the substrate 6; therefore, the positioning fixture provided by the utility model can prevent the substrate 6 from escaping from the positioning fixture along the limiting column 22 in the direction away from the base 1 through the stop block 23 and the locking assembly 3, thereby improving the installation stability of the substrate 6.

[0039] In this embodiment, the base 1 has a circular outer contour, and the reference line 110 is the central axis of the circular outer contour of the base 1 .

[0040] In some other embodiments, the reference line 110 may be any straight line on the base 1 that is parallel to the first direction Z, which is not limited here.

[0041] The first axis 10 is the central axis of the connecting column 21 .

[0042] In this embodiment, the first direction Z is the height direction of the substrate 6 positioning fixture, and the first plane is a horizontal plane.

[0043] Figure 2 and Figure 4 The second end 232 of the stopper 23 is shown to be located at the first position, and the orthographic projection of the second end 232 on the first plane is located within the range of the installation space 220 .

[0044] Figure 3 and Figure 5 The second end 232 of the stopper 23 is shown to be located at the second position, and the orthographic projection of the second end 232 on the first plane is outside the range of the installation space 220 .

[0045] It should be noted that Figure 4 and Figure 5 The dotted circle represents the range of the installation space 220 on the first plane along the first direction Z.

[0046] The first axis 10 is parallel to the first direction Z. In this way, when the staff rotates the limiter 2 around the first axis 10 to rotate the stopper 23 into the range of the installation space 220, the stopper 23 can play the role of blocking the substrate 6 from escaping from the positioning fixture; similarly, when the staff rotates the limiter 2 around the first axis 10 to rotate the stopper 23 away from the installation space 220, the substrate 6 can be loaded into the installation space 220 or taken out of the installation space 220.

[0047] See also Figure 1-Figure 3 The limiter 2 provided in the embodiment of the utility model further includes a connecting block 24, which is fixedly connected to the connecting column 21; the locking assembly 3 includes a first magnet 31 and a second magnet 32, the first magnet 31 is fixedly connected to the connecting block 24, and the second magnet 32 ​​is fixedly connected to the base 1 and cooperates with the first magnet 31. The first magnet 31 and the second magnet 32 ​​cooperate to realize the function of locking the second end 232 in the first position, and the structure is simple and easy to assemble; by arranging the connecting block 24 on the connecting column 21, the connecting block 24 can be used as a handle for the staff to rotate the connecting column 21, which is convenient for the staff to operate; by arranging the first magnet 31 on the connecting block 24, the staff only needs to operate the connecting block 24 and move the first magnet 31 to a position where it contacts the second magnet 32 ​​to lock the limiter 2 and limit the rotation of the connecting column 21. Similarly, the staff only needs to operate the connecting block 24 and move the first magnet 31 to a position separated from the second magnet 32 ​​to unlock the limiter 2 and make the connecting column 21 rotate easily. The locking and unlocking of the locking assembly 3 are simple, and the staff can operate it easily.

[0048] The base 1 includes a main body 11, a first mounting portion 12 and a second mounting portion 13. The first mounting portion 12 is fixedly connected to the outer wall of the main body 11. The first mounting portion 12 is provided with a through hole 121 that penetrates along the first direction Z and for the connecting column 21 to pass through. The second mounting portion 13 is fixedly connected to the outer wall of the main body 11 and is located on the side of the first mounting portion 12 that is away from the stop block 23 in the first direction Z; along the first direction Z, the connecting block 24 is located between the first mounting portion 12 and the second mounting portion 13; the second magnet 32 ​​is fixedly connected to one end of the second mounting portion 13 in the first direction Z that is close to the first mounting portion 12.

[0049] In this embodiment, the first mounting portion 12 is a first annular protrusion disposed around the main body portion 11 . The second mounting portion 13 is a second annular protrusion disposed around the main body portion 11 .

[0050] See also Figure 1-Figure 3 ,and Figure 6 and Figure 7The positioning fixture provided by the embodiment of the utility model further includes a pressing member 4, which is connected to the connecting block 24; wherein, when the second end 232 is placed in the first position, the outer wall of the pressing member 4 contacts the outer wall of the main body 11. The use of the pressing member 4 can prevent the outer wall of the connecting block 24 from contacting the outer wall of the main body 11, plays a role in maintaining the position of the stopper 2, and helps to keep the second end 232 in the first position through the stopper 2.

[0051] See also Figure 1-Figure 3 ,and Figure 6 and Figure 7 The positioning fixture provided by the embodiment of the utility model also includes a telescopic spring 5; a mounting cavity 241 is provided inside the connecting block 24, the telescopic spring 5 is arranged in the mounting cavity 241, the connecting block 24 is provided with a mounting hole 242 connected to the mounting cavity 241, and the pressing piece 4 is connected to the telescopic spring 5 through the mounting hole 242. In this way, the telescopic spring 5 can provide elastic force for the pressing piece 4, so that when the second end 232 is placed in the first position, the limiting piece 2 can be affected by the attraction of the first magnet 31 and the second magnet 32, and the elastic force of the telescopic spring 5, so that the limiting piece 2 can keep the second end 232 in the first position by the attraction and the elastic force.

[0052] In this embodiment, the pressing piece 4 is a spherical structure, the mounting hole 242 is a circular mounting hole, and the diameter of the pressing piece 4 is larger than the aperture of the mounting hole 242. In this way, the spherical structure and the circular through hole 121 are used and the relationship between the diameter of the pressing piece 4 and the aperture of the mounting hole 242 is defined, so that the pressing piece 4 will only be partially exposed from the mounting hole 242 under the action of the telescopic spring 5, so as to prevent the pressing piece 4 from escaping from the limiting piece 2 through the through hole 121.

[0053] In this embodiment, the stopper 2 further includes a screw 26. The end of the installation cavity 241 away from the connecting column 21 is open to form an opening. The screw 26 is detachably connected to the connecting column 21 and blocks the opening. The end of the telescopic spring 5 away from the pressing piece 4 is connected to the screw 26. In this way, it is convenient to install the telescopic spring 5 and the pressing piece 4 into the installation cavity 241 or to take the telescopic spring 5 and the pressing piece 4 out of the installation cavity 241.

[0054] See also Figure 1-Figure 7 The radius of the connecting column 21 provided in the embodiment of the utility model is greater than the radius of the limiting column 22. In this way, the upper surface of the connecting column 21 can serve as an axial limiting surface of the substrate 6 to limit the position change of the substrate 6 along the limiting column 22 in the direction away from the stopper 23.

[0055] In some other embodiments, the radius of the connecting column 21 may be less than or equal to the radius of the limiting column 22. In this way, the upper surface of the base 1 serves as the axial limiting surface of the substrate 6 to limit the position change of the substrate 6 along the limiting column 22 in the direction away from the stop block 23.

[0056] In this embodiment, the limiting member 2 further includes a truncated cone 25, through which the limiting column 22 is fixedly connected to the connecting column 21. The truncated cone 25 has a first end face 251 and a second end face 252 opposite to each other in the first direction Z. The radius of the first end face 251 is smaller than the radius of the second end face 252. The limiting column 22 is fixedly connected to the first end face 251, and the connecting column 21 is fixedly connected to the second end face 252. In this way, the limiting column 22 is connected to the small face end of the truncated cone 25, and the connecting column 21 is connected to the large face end of the truncated cone 25. The side surface of the truncated cone 25 can be used as a circumferential limiting surface of the substrate 6, so as to clamp the substrate 6 through the outer side wall of the truncated cone 25.

[0057] The limiting column 22 has a second axis 20, the truncated cone 25 has a third axis 30, the first axis 10, the second axis 20 and the third axis 30 coincide with each other, the radius of the connecting column 21 is equal to the radius of the second end face 252, and the radius of the limiting column 22 is equal to the radius of the first end face 251. In this way, the limiting column 22 can smoothly transition to the connecting column 21 through the truncated cone 25, and the outer side surface of the truncated cone 25 can also be used as the circumferential limiting surface of the substrate 6, and a limiting space can be defined between multiple truncated cones 25. Therefore, when the radius of the substrate 6 is equal to the radius of the installation space 220, the substrate 6 can be installed in the installation space 220 to realize the loading and positioning of the substrate 6. When the radius of the substrate 6 is less than the radius of the installation space 220 and greater than the minimum radius of the limiting space, the substrate 6 can be installed in the limiting space to realize the loading and positioning of the substrate 6. Therefore, by adopting the method of coinciding the three axes and defining the three radii, the positioning fixture can be used for loading and positioning substrates 6 of various sizes, and has a wide range of applications.

[0058] The second axis 20 is the central axis of the limiting column 22 , and the third axis 30 is the central axis of the truncated table 25 .

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A positioning fixture having a first direction (Z), characterized in that: include: A base (1), the base (1) having a reference line (110); a plurality of limiting members (2), the plurality of limiting members (2) being distributed around the reference line (110), the limiting members (2) comprising a connecting column (21), a limiting column (22) and a stopper (23), the connecting column (21) having a first axis (10), the connecting column (21) being connected to the base (1) and being capable of rotating around the first axis (10), the limiting column (22) being fixedly connected to an end of the connecting column (21) away from the base (1) in the first direction (Z), the stopper (23) having a first end (231) and a second end (232) opposite to each other, the first end (231) being fixedly connected to an end of the limiting column (22) away from the connecting column (21) in the first direction (Z), the connecting column (21) rotating around the first axis (10) being capable of driving the second end (232) to move between a first position and a second position; a locking assembly (3), the locking assembly (3) being respectively connected to the limiting member (2) and the base (1), the locking assembly (3) being capable of locking the limiting member (2) so as to lock the second end (232) in the first position; Wherein, a mounting space (220) is defined between the plurality of limit columns (22), and the first direction (Z) is perpendicular to the first plane; when the second end (232) is placed in the first position, along the first direction (Z), the orthographic projection of the second end (232) on the first plane is located within the range of the mounting space (220) in the first plane; when the second end (232) is placed in the second position, the orthographic projection of the second end (232) on the first plane is located outside the range of the mounting space (220) in the first plane.

2. The positioning fixture according to claim 1, characterized in that: The first axis (10) and the first direction (Z) are parallel.

3. The positioning fixture according to claim 2, characterized in that: The limiting member (2) further comprises a connecting block (24), wherein the connecting block (24) is fixedly connected to the connecting column (21); The locking assembly (3) comprises a first magnet (31) and a second magnet (32), wherein the first magnet (31) is fixedly connected to the connecting block (24), and the second magnet (32) is fixedly connected to the base (1) and cooperates with the first magnet (31).

4. The positioning fixture according to claim 3, characterized in that: The base (1) comprises a main body (11), a first mounting part (12) and a second mounting part (13); the first mounting part (12) is fixedly connected to the outer wall of the main body (11); the first mounting part (12) is provided with a through hole (121) penetrating along the first direction (Z) and allowing the connecting column (21) to pass through; the second mounting part (13) is fixedly connected to the outer wall of the main body (11) and is located on a side of the first mounting part (12) away from the stop block (23) in the first direction (Z); along the first direction (Z), the connecting block (24) is located between the first mounting part (12) and the second mounting part (13); the second magnet (32) is fixedly connected to an end of the second mounting part (13) close to the first mounting part (12) in the first direction (Z).

5. The positioning fixture according to claim 4, characterized in that: It also includes a pressing piece (4), wherein the pressing piece (4) is connected to the connecting block (24); Wherein, when the second end (232) is placed in the first position, the outer wall of the pressing piece (4) and the outer wall of the main body (11) are in contact.

6. The positioning fixture according to claim 5, characterized in that: Also includes a telescopic spring (5); The connection block (24) has an installation cavity (241) formed inside, the telescopic spring (5) is arranged in the installation cavity (241), the connection block (24) has an installation hole (242) connected to the installation cavity (241), and the pressing piece (4) is connected to the telescopic spring (5) through the installation hole (242).

7. The positioning fixture according to claim 6, characterized in that: The pressing piece (4) is in a spherical structure, the mounting hole (242) is a circular mounting hole, and the diameter of the pressing piece (4) is greater than the hole diameter of the mounting hole (242).

8. The positioning fixture according to any one of claims 1 to 7, characterized in that: The radius of the connecting column (21) is greater than the radius of the limiting column (22).

9. The positioning fixture according to claim 8, characterized in that: The limiting member (2) further comprises a truncated cone (25), the limiting column (22) being fixedly connected to the connecting column (21) via the truncated cone (25), the truncated cone (25) having a first end face (251) and a second end face (252) opposite to each other in the first direction (Z), the radius of the first end face (251) being smaller than the radius of the second end face (252), the limiting column (22) being fixedly connected to the first end face (251), and the connecting column (21) being fixedly connected to the second end face (252).

10. The positioning fixture according to claim 9, characterized in that: The limiting column (22) has a second axis (20), the truncated cone (25) has a third axis (30), the first axis (10), the second axis (20) and the third axis (30) coincide with each other, the radius of the connecting column (21) is equal to the radius of the second end face (252), and the radius of the limiting column (22) is equal to the radius of the first end face (251).

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