Welding fixture

Abstract

The utility model discloses a welding fixture, which belongs to the technical field of semiconductor manufacturing, and comprises a positioning body and a clamping component, the positioning body is provided with a positioning groove used for positioning an object to be welded, the clamping component is movably connected to the positioning body and has a first position and a second position, and when the clamping component is located at the first position, the clamping component is clamped in the positioning groove. When the clamping assembly is located at the first position, the clamping assembly can abut against the to-be-welded object and limit the to-be-welded object in the axis direction of the positioning body together with the groove bottom of the positioning groove, and when the clamping assembly is located at the second position, the orthographic projection of the clamping assembly on the positioning body is located outside the positioning groove, so that the clamping assembly does not limit the to-be-welded object in the axis direction of the positioning body any more. Through cooperation of the positioning body and the clamping assembly, stable positioning of the to-be-welded object is achieved, the flatness of the to-be-welded object after welding can be guaranteed, and then the sealing performance of the to-be-welded object is guaranteed.

Description

Technical Field

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

[0002] Chemical vapor deposition technology is often used in semiconductor manufacturing. One or more gaseous compounds or single substances containing thin film elements react chemically on the substrate surface to form a thin film. This process is a type of chemical vapor deposition (CVD). Its principle is to use various energy sources such as heating, plasma excitation or light radiation to make gaseous or vaporous chemicals in the reactor react chemically in the gas phase or on the gas-solid interface to form solid deposits.

[0003] During the CVD coating process, the wafer is under the gas distribution plate. During the CVD chemical vapor deposition process, the gas distribution plate must ensure good sealing to ensure the stability of the deposition process.

[0004] In the prior art, the upper plate and the lower plate of the gas distribution plate are directly welded. Specifically, a groove is provided on the auxiliary welding jig, and the lower plate is first placed in the groove, and then the upper plate is placed on the lower plate after aligning the upper plate and the lower plate, and then the upper plate and the lower plate are welded. However, when the cross-section of the lower plate is circular, the groove is also circular, resulting in the lower plate being able to achieve radial positioning only, but not circumferential positioning, which leads to the lower plate being easier to rotate in the groove during the welding process of the upper plate and the lower plate. The unstable positioning of the lower plate will increase the difficulty of the welding operation of the upper plate and the lower plate, and will also result in poor flatness after the upper and lower plates are welded, which leads to poor sealing of the gas distribution plate after welding. Utility Model Content

[0005] The utility model aims to provide a welding fixture, which can stably position the object to be welded, ensure the flatness of the object to be welded after welding, and further ensure the sealing of the object to be welded.

[0006] As conceived above, the technical solution adopted by the utility model is:

[0007] Welding fixture, including:

[0008] A positioning body, wherein the positioning body is provided with a positioning groove, and the positioning groove is used to position the object to be welded;

[0009] A clamping assembly, wherein the clamping assembly is movably connected to the positioning body and has a first position and a second position. When the clamping assembly is located at the first position, the clamping assembly can abut against the object to be welded and limit the object to be welded in the axial direction of the positioning body together with the bottom of the positioning groove. When the clamping assembly is located at the second position, the orthographic projection of the clamping assembly on the positioning body is located outside the positioning groove.

[0010] Furthermore, the welding fixture also includes a locking member, which is movably disposed on the positioning body and is configured to lock the clamping assembly in the first position.

[0011] Furthermore, the clamping assembly is slidably connected to the positioning body.

[0012] Further, the clamping assembly includes a pressing block. When the clamping assembly is located at the first position, one end of the pressing block can abut against the object to be welded, and can limit the object to be welded in the axial direction of the positioning body together with the bottom of the positioning groove; when the clamping assembly is located at the second position, the orthographic projection of the pressing block on the positioning body is located outside the positioning groove;

[0013] The pressing block is provided with an elongated hole, and the positioning body is provided with a threaded hole. A bolt passes through the elongated hole and is threadedly connected to the threaded hole to lock the pressing block on the positioning body. The pressing block can slide relative to the positioning body through the elongated hole.

[0014] Furthermore, the clamping assembly further comprises a support member, one end of which is connected to an end of the pressing block away from the positioning groove, and the other end of the support member is supported on the positioning body.

[0015] Furthermore, the support member is connected to the pressing block in an adjustable manner in the axial direction thereof.

[0016] Furthermore, when the clamping assembly is located at the first position, the bolt abuts against a preset hole wall of the elongated hole to limit the movement limit of the pressing block, and the preset hole wall is the hole wall of the elongated hole at one end away from the positioning groove in its length direction.

[0017] Furthermore, the clamping assembly is rotatably connected to the positioning body.

[0018] Furthermore, the clamping assembly is provided with a through hole, and the welding fixture also includes a rotating shaft fixed on the positioning body, the rotating shaft passes through the through hole, and the clamping assembly can rotate around the rotating shaft, so that the clamping assembly moves between the first position and the second position.

[0019] Furthermore, the clamping assemblies are provided in plurality, and the plurality of clamping assemblies are arranged at intervals in the circumferential direction of the positioning body.

[0020] The welding clamp proposed by the utility model comprises: a positioning body and a clamping assembly, the positioning body is provided with a positioning groove, the positioning groove is used to position the object to be welded, the clamping assembly is movably connected to the positioning body and has a first position and a second position, when the clamping assembly is located at the first position, the clamping assembly can abut against the object to be welded, and limit the object to be welded in the axial direction of the positioning body together with the groove bottom of the positioning groove, when the clamping assembly is located at the second position, the positive projection of the clamping assembly on the positioning body is located outside the positioning groove, so that the clamping assembly no longer limits the object to be welded in the axial direction of the positioning body, and the stable positioning of the object to be welded is achieved through the cooperation of the positioning body and the clamping assembly, and the flatness of the object to be welded after welding can be guaranteed, thereby ensuring the sealing of the object to be welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a welding fixture provided by an embodiment of the utility model clamping an object to be welded;

[0022] Figure 2 It is a structural schematic diagram of a clamping assembly of a welding fixture provided by an embodiment of the utility model being located in a first position;

[0023] Figure 3 It is a structural schematic diagram of a clamping assembly of a welding fixture provided by an embodiment of the utility model being located in a second position;

[0024] Figure 4 This utility model Figure 2 Enlarged view of point A in the middle;

[0025] Figure 5 This utility model Figure 3 Enlarged view of point B in the middle;

[0026] Figure 6 is a cross-sectional view of a welding fixture provided by an embodiment of the utility model;

[0027] Figure 7 It is a structural schematic diagram of the installation slot of the welding fixture provided in an embodiment of the utility model;

[0028] Figure 8 It is a structural schematic diagram of a welding fixture provided in an embodiment of the utility model for clamping a lower plate body of a gas distribution plate.

[0029] In the figure:

[0030] 1. Positioning body; 11. Positioning groove; 12. Threaded hole; 13. Notch; 14. Mounting groove; 2. Clamping assembly; 21. Press block; 211. Long hole; 2111. Preset hole wall; 22. Bolt; 23. Support member; 3. Workpiece to be welded. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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.

[0033] 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.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Embodiment 1

[0036] This embodiment provides a welding fixture to improve the positioning effect of the object to be welded, thereby ensuring the flatness of the object to be welded after welding and ensuring the sealing of the object to be welded.

[0037] like Figure 1-Figure 3 As shown, the welding fixture includes a positioning body 1 and a clamping assembly 2. The positioning body 1 is provided with a positioning groove 11, and the positioning groove 11 is used to position the object to be welded. For example, at least part of the object to be welded is located in the positioning groove 11, and the bottom surface of the object to be welded abuts against the groove wall of the positioning groove 11, and the outer wall of the object to be welded abuts against the groove wall of the positioning groove 11, so as to realize the positioning groove 11 limiting the position of the object to be welded.

[0038] The clamping assembly 2 is movably connected to the positioning body 1 and has a first position and a second position. Specifically, when the clamping assembly 2 is located at the first position, the clamping assembly 2 can abut against the object to be welded, and the clamping assembly 2 and the bottom of the positioning groove 11 jointly clamp the object to be welded in the axial direction of the positioning body 1, thereby achieving the limitation of the axial direction and radial direction of the object to be welded, and preventing the object to be welded from moving and rotating; when the clamping assembly 2 is located at the second position, the orthographic projection of the clamping assembly 2 on the positioning body 1 is located outside the positioning groove 11, so that the clamping assembly 2 no longer limits the object to be welded in the axial direction of the positioning body 1, and the welded object can be taken out.

[0039] In this embodiment, the clamping assembly 2 is movably connected to the positioning body 1 and has a first position and a second position. When the clamping assembly 2 is in the first position, the clamping assembly 2 and the bottom of the positioning groove 11 limit the object to be welded in the axial direction of the positioning body 1. When the clamping assembly 2 is in the second position, the orthographic projection of the clamping assembly 2 on the positioning body 1 is located outside the positioning groove 11, so that the clamping assembly 2 no longer limits the object to be welded in the axial direction of the positioning body 1. The positioning of the object to be welded is achieved through the cooperation of the positioning body 1 and the clamping assembly 2, which can ensure the flatness of the object to be welded after welding, thereby ensuring the sealing of the object to be welded.

[0040] Optionally, the positioning groove 11 is provided on one surface of the positioning body 1 in the thickness direction, and the positioning body 1 is provided with a mounting groove 14 on another surface in the thickness direction thereof. The mounting groove 14 is used to mount the positioning body 1 on the operating table, fix the entire positioning body 1, and improve the stability of the positioning body 1. For example, a mounting boss is provided on the operating table, and when the positioning body 1 is installed, the mounting groove 14 is aligned with the mounting boss so that the mounting boss can be inserted into the mounting groove, thereby realizing radial positioning of the positioning body 1. In some optional embodiments, the cross-sections of the mounting groove 14 and the mounting boss can both be polygonal, so that after the mounting boss is inserted into the mounting groove 14, the positioning body 1 will not rotate relative to the operating table.

[0041] Optionally, the welding fixture further includes a locking member (not shown), which is movably disposed on the positioning body 1 and is used to lock the clamping assembly 2 in the first position to ensure that the clamping assembly 2 abuts against the object to be welded, further improving the stability of clamping the object to be welded. By way of example, the locking member can be a bolt, and when the clamping assembly 2 is located in the first position, the clamping assembly 2 is fixed to the positioning body 1 by the bolt. By way of another example, the locking member can also be a pressure plate, one end of which is rotatably connected to the positioning body 1 by a torsion spring, and the other end can be pressed on the clamping assembly 2 to lock the clamping assembly 2 in the first position. Of course, it can be understood that the locking member can also be other structures that can lock the clamping assembly 2 in the first position, and this embodiment does not limit this.

[0042] Optionally, when the clamping assembly 2 is located at the second position, the clamping assembly 2 may be locked at the second position by a locking member, or the clamping assembly 2 at the second position may not be locked, which is not limited in this embodiment.

[0043] In this embodiment, the clamping assembly 2 is slidably connected to the positioning body 1. By slidably connecting the clamping assembly 2 to the positioning body 1, it is convenient for the operator to use. When in use, the operator can slide the clamping assembly 2 to make the clamping assembly 2 located in the first position or the second position, thereby achieving positioning or releasing the positioning of the object to be welded, avoiding the need to reinstall the clamping assembly 2 on the positioning body 1 every time the object to be welded is positioned, and the positioning efficiency is high.

[0044] Furthermore, if Figure 2 and Figure 4 As shown, the clamping assembly 2 includes a pressing block 21. When the clamping assembly 2 is located at the first position, one end of the pressing block 21 can abut against the object to be welded, and can limit the object to be welded in the axial direction of the positioning body 1 together with the bottom of the positioning groove 11. Specifically, the object to be welded is located between the bottom of the positioning groove 11 and the pressing block 21, and abuts against the bottom of the positioning groove 11 and the pressing block 21, respectively, thereby limiting the object to be welded in the axial direction of the positioning body 1, and preventing the object to be welded from moving along the axial direction of the positioning body 1.

[0045] like Figure 3 and Figure 5 As shown, when the clamping assembly 2 is located at the second position, the orthographic projection of the pressing block 21 on the positioning body 1 is located outside the positioning groove 11. Specifically, the pressing block 21 no longer abuts against the object to be welded, and the object to be welded is no longer limited in the axial direction of the positioning body 1, which facilitates the removal of the object to be welded and the placement of the object to be welded in the positioning groove 11.

[0046] This embodiment provides a possible implementation method of slidingly connecting the clamping assembly 2 to the positioning body 1. Specifically, Figure 4-Figure 6As shown, the pressing block 21 is provided with an elongated hole 211, and the positioning body 1 is provided with a threaded hole 12. A bolt 22 is arranged to pass through the elongated hole 211 and then be threadedly connected to the threaded hole 12. On the one hand, the pressing block 21 and the positioning body 1 can be detachably connected. On the other hand, the pressing block 21 can also be locked on the positioning body 1, and then the clamping assembly 2 can be locked in the first position to prevent the pressing block 21 from moving in the axial direction of the positioning body 1. That is, the locking member in this embodiment is the bolt 22.

[0047] In this embodiment, the pressing block 21 can slide relative to the positioning body 1 through the elongated hole 211, thereby satisfying the sliding connection of the clamping assembly 2 to the positioning body 1. Specifically, the length direction of the elongated hole 211 is parallel to the radial direction of the positioning body 1, and the pressing block 21 can slide relative to the positioning body 1 along the radial direction of the positioning body 1 through the elongated hole 211.

[0048] Furthermore, the bolt 22 includes a threaded section and a nut, and the nut is located on the side of the pressure block 21 away from the positioning body 1. When the clamping assembly 2 is in the first position, the bolt 22 can be rotated to make the side of the nut close to the threaded section abut against the pressure block 21, so that the pressure block 21 can be stably abutted against the object to be welded, and the pressure block 21 is locked, thereby improving the positioning effect when the clamping assembly 2 is in the first position.

[0049] Alternatively, if Figure 4 As shown, the clamping assembly 2 further includes a support member 23, one end of the support member 23 is connected to one end of the pressing block 21 away from the positioning groove 11, and the other end of the support member 23 is supported on the positioning body 1. By providing the support member 23, when the clamping assembly 2 is located in the first position, the nut abuts against the pressing block 21, and the abutment of the support member 23 enables one end of the pressing block 21 to better abut against the object to be welded, which can further improve the stability of the pressing block 21 and ensure the limiting effect on the object to be welded.

[0050] Furthermore, the support member 23 is connected to the pressure block 21 in an adjustable position in the axial direction thereof, so that when the height of the pressure block 21 relative to the positioning body 1 is different, the other end of the support member 23 can always be supported on the positioning body 1, thereby enabling the welding fixture to be used for positioning objects to be welded of different sizes, facilitating the adjustment of different positioning heights, and improving the applicability of the clamping assembly 2.

[0051] Alternatively, if Figure 4As shown, when the clamping assembly 2 is located in the first position, the bolt 22 abuts against the preset hole wall 2111 of the elongated hole 211 to limit the movement limit of the pressing block 21, and the preset hole wall 2111 is the hole wall of the elongated hole 211 at one end away from the positioning groove 11 in its length direction. It can be understood that when the clamping assembly 2 is located in the first position, the bolt 22 abuts against the preset hole wall 2111 of the elongated hole 211 to limit the movement limit of the pressing block 21, and it can also be used to determine whether the clamping assembly 2 is completely in the first position, so as to ensure the positioning accuracy of the clamping assembly 2 and facilitate operation. It can also avoid the problem that the length of the pressing block 21 extending into the positioning groove 11 is too long to affect welding or damage the object to be welded, and it can avoid the problem that the length of the pressing block 21 extending into the positioning groove 11 is too short to press the object to be welded.

[0052] In order to further improve the positioning effect of the welding fixture, in this embodiment, Figure 2-Figure 3 As shown, there are multiple clamping assemblies 2, and the multiple clamping assemblies 2 are arranged at intervals in the circumferential direction of the positioning body 1, which has a high limit reliability. Optionally, the multiple clamping assemblies 2 are evenly spaced in the circumferential direction of the positioning body 1 to ensure the uniform force of the object to be welded. For example, there are 2, 6, 7, 8, etc. clamping assemblies 2.

[0053] Furthermore, if Figure 7 As shown, the positioning body 1 is provided with a notch 13, and the notch 13 extends to the positioning groove 11. During use, it is convenient for the operator to place the object to be welded on the positioning groove 11. Preferably, a plurality of notches 13 can be provided. In this embodiment, the positioning body 1 is provided with two notches 13, and the two notches 13 are symmetrically arranged on the positioning body 1.

[0054] Preferably, the position where the notch 13 is connected to the outer edge of the positioning body 1 is in an arc shape, so as to prevent the operator from touching and injuring the operator's hands when taking or placing the object to be welded.

[0055] In this embodiment, if Figure 1 and Figure 8As shown, the object to be welded is a gas distribution plate. During operation, the operator first ensures that the clamping assembly 2 is located in the second position, that is, the orthographic projection of the clamping assembly 2 on the positioning body 1 is located outside the positioning groove 11, so as to avoid the clamping assembly 2 affecting the normal installation of the gas distribution plate. Then the lower plate of the gas distribution plate is placed in the positioning groove 11, and then the clamping assembly 2 is slid to the first position, that is, the sliding pressing block 21 slides relative to the positioning body 1 along the radial direction of the positioning body 1 through the elongated hole 211 on the pressing block 21, so that the pressing block 21 abuts against the upper end surface of the lower plate of the gas distribution plate, and then the bolt 22 is rotated to lock the position of the pressing block 21, and the side of the nut close to the threaded section abuts against the pressing block 21, so that the pressing block 21 stably abuts against the lower plate of the gas distribution plate, and the lower plate of the gas distribution plate is fixed, and then the upper plate of the gas distribution plate is assembled on the lower plate of the gas distribution plate, and the assembly of the upper and lower plates of the gas distribution plate is completed, and then the upper and lower plates of the gas distribution plate are welded. After welding is completed, the bolt 22 is rotated in the opposite direction so that the bolt 22 no longer axially limits the pressing block 21, and the pressing block 21 can slide relative to the positioning body 1 to move the clamping assembly 2 to the second position, and then the welded gas distribution plate can be removed.

[0056] Embodiment 2

[0057] The difference between this embodiment and the first embodiment is that the clamping assembly 2 is rotatably connected to the positioning body 1 .

[0058] Specifically, the clamping assembly 2 is provided with a through hole, and the welding fixture further includes a rotating shaft fixed on the positioning body 1, the rotating shaft is penetrated through the through hole, and the clamping assembly 2 can rotate around the rotating shaft, so that the clamping assembly 2 moves between the first position and the second position to meet the use requirements of the welding fixture, and the clamping assembly 2 is rotatably connected to the positioning body 1, which is easy to operate, and the operator can directly rotate the clamping assembly 2 during use. In this embodiment, the object to be welded is a gas distribution plate. When working, the operator first ensures that the clamping assembly 2 is located in the second position, that is, the positive projection of the clamping assembly 2 on the positioning body 1 is located outside the positioning groove 11, so as to avoid the clamping assembly 2 affecting the normal installation of the gas distribution plate. Then the lower plate body of the gas distribution plate is placed in the positioning groove 11, and then the clamping assembly 2 is rotated to the first position, that is, the clamping assembly 2 rotates around the rotating shaft, so that the clamping assembly 2 abuts against the upper end surface of the lower plate body of the gas distribution plate. Then, the clamping assembly 2 is locked in the first position by the locking member, so that the clamping assembly 2 is more stably abutted against the lower plate body of the gas distribution plate, and the lower plate body of the gas distribution plate is fixed. Then, the upper plate body of the gas distribution plate is assembled on the lower plate body of the gas distribution plate, and the assembly of the upper and lower plates of the gas distribution plate is completed, and then the upper and lower plates of the gas distribution plate are welded. After welding is completed, the contact locking member locks the clamping assembly 2, and the clamping assembly 2 is controlled to rotate so that the clamping assembly 2 moves to the second position, and the welded gas distribution plate can be removed.

[0059] The other structures in this embodiment are the same as the corresponding structures in the first embodiment and have similar beneficial effects, and will not be described in detail here.

[0060] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Welding fixture, characterized in that, include: A positioning body (1), wherein the positioning body (1) is provided with a positioning groove (11), and the positioning groove (11) is used for positioning and placing an object to be welded; A clamping assembly (2), wherein the clamping assembly (2) is movably connected to the positioning body (1) and has a first position and a second position. When the clamping assembly (2) is located at the first position, the clamping assembly (2) can abut against an object to be welded and, together with the bottom of the positioning groove (11), limit the position of the object to be welded in the axial direction of the positioning body (1). When the clamping assembly (2) is located at the second position, the orthographic projection of the clamping assembly (2) on the positioning body (1) is located outside the positioning groove (11).

2. The welding fixture according to claim 1, characterized in that: The welding fixture further comprises a locking member, which is movably arranged on the positioning body (1) and is configured to lock the clamping assembly (2) in the first position.

3. The welding fixture according to claim 1, characterized in that: The clamping assembly (2) is slidably connected to the positioning body (1).

4. The welding fixture according to claim 3, characterized in that: The clamping assembly (2) comprises a pressing block (21); when the clamping assembly (2) is located at the first position, one end of the pressing block (21) can abut against the object to be welded, and can limit the position of the object to be welded in the axial direction of the positioning body (1) together with the bottom of the positioning groove (11); when the clamping assembly (2) is located at the second position, the orthographic projection of the pressing block (21) on the positioning body (1) is located outside the positioning groove (11); The pressing block (21) is provided with an elongated hole (211), and the positioning body (1) is provided with a threaded hole (12). A bolt (22) passes through the elongated hole (211) and is threadedly connected to the threaded hole (12) to lock the pressing block (21) on the positioning body (1). The pressing block (21) can slide relative to the positioning body (1) through the elongated hole (211).

5. The welding fixture according to claim 4, characterized in that: The clamping assembly (2) further comprises a support member (23), one end of the support member (23) being connected to an end of the pressing block (21) away from the positioning groove (11), and the other end of the support member (23) being supported on the positioning body (1).

6. The welding fixture according to claim 5, characterized in that: The support member (23) is connected to the pressing block (21) in a positionally adjustable manner in the axial direction thereof.

7. The welding fixture according to claim 4, characterized in that: When the clamping assembly (2) is located at the first position, the bolt (22) abuts against a preset hole wall (2111) of the elongated hole (211) to limit the movement limit of the pressing block (21), wherein the preset hole wall (2111) is the hole wall of the elongated hole (211) at one end thereof away from the positioning groove (11) in its length direction.

8. The welding fixture according to claim 1, characterized in that: The clamping assembly (2) is rotatably connected to the positioning body (1).

9. The welding fixture according to claim 8, characterized in that: The clamping assembly (2) is provided with a through hole, and the welding fixture also includes a rotating shaft fixed on the positioning body (1), the rotating shaft is passed through the through hole, and the clamping assembly (2) can rotate around the rotating shaft, so that the clamping assembly (2) moves between the first position and the second position.

10. The welding fixture according to any one of claims 1 to 9, characterized in that: The clamping assemblies (2) are provided in plurality, and the plurality of clamping assemblies (2) are arranged at intervals in the circumferential direction of the positioning body (1).

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