Ball valve welding fixing tool

Abstract

The utility model belongs to mechanical manufacturing technical field, especially point to a kind of ball valve welding fixed tool, comprising: pedestal assembly, including fixed pedestal and the two support plates of symmetric solid setting on it, and the clamping slot of supporting plate top has the valve body and valve cover;Radial limiting component, including the first limiting component of left side fixed valve body and the second limiting component of right side fixed valve cover;Axial compression assembly, including the lead screw of penetrating valve body and valve cover center, lead screw one end is successively set first bearing and first pressure nut, the other end is set second bearing and second pressure nut, two bearing inner rings are respectively abutted valve body and valve cover axial outer end face;Rotating two pressure nuts can push valve body and valve cover axial compression tight.The utility model is pushed axial compression tight by clamping slot receiving, radial limiting component fixed, lead screw and nut, realize the accurate centering and stable compression of valve body and valve cover.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical manufacturing technology, and specifically refers to a ball valve welding and fixing fixture. Background Technology

[0002] In the manufacturing process of fully welded ball valves, the fixture plays a crucial role. It is primarily used to precisely position and securely clamp the valve body and cover during the welding process, ensuring that they maintain the correct relative position and tight fit during welding. This guarantees the quality and sealing of the weld joint, making it a key piece of equipment for achieving efficient and high-quality welding production.

[0003] However, existing ball valve welding fixtures have many problems in practical applications. For example, some fixtures use simple slot structures to support the valve body and cover, but lack effective radial limiting measures. During welding, the workpiece is easily displaced by external forces, making precise alignment difficult. Other fixtures, although equipped with radial clamping devices, have unreasonable structural designs that cannot apply pressure evenly to the workpiece, resulting in gaps or misalignments between the valve body and cover, affecting welding quality. In addition, the axial pressing method of traditional fixtures is often inflexible and cumbersome, making it difficult to quickly achieve a tight press between the valve body and cover. This not only reduces welding efficiency but also easily leads to welding defects such as incomplete welds and weld beads due to insufficient pressing, seriously affecting the production quality and efficiency of fully welded ball valves. Utility Model Content

[0004] This invention achieves precise alignment and stable pressing of the valve body and valve cover by using the slot of the base assembly to receive the workpiece, the radial limiting assembly to fix the workpiece, and the screw and nut of the axial pressing assembly to push and press axially, thereby alleviating the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved as follows: a ball valve welding and fixing fixture, comprising:

[0006] The base assembly includes a fixed base and two support plates symmetrically fixed on the fixed base. The top of the two support plates is provided with slots for receiving the valve body and the valve cover.

[0007] The radial limiting assembly includes a first limiting assembly disposed on the left support plate for fixing the valve body, and a second limiting assembly disposed on the right support plate for fixing the valve cover;

[0008] The axial pressing assembly includes a lead screw that passes through the central axis of the valve body and the valve cover, a first bearing and a first pressure nut sequentially sleeved on one end of the lead screw, and a second bearing and a second pressure nut sequentially sleeved on the other end of the lead screw. The inner ring of the first bearing abuts against the axial outer end face of the valve body, and the inner ring of the second bearing abuts against the axial outer end face of the valve cover.

[0009] The first and second pressure nuts on both sides are rotated to push the valve cover and valve body to be axially pressed together.

[0010] The present invention is further provided that the support plates are provided with symmetrically arranged connecting arms.

[0011] The present invention is further configured such that the first limiting component and the second limiting component have the same structure, both including:

[0012] The limiting plate is vertically fixed to the outside of the support plate and located on one side of the slot;

[0013] The limiting claw is hinged to the outside of the support plate and located on the other side of the slot;

[0014] Locking element, used to detachably connect the free end of the limiting claw to the limiting plate;

[0015] The limiting plate and the limiting claw cooperate to form a radial clamping structure for the workpiece in the slot of the supporting plate.

[0016] The present invention is further configured such that the contact surface of the limiting claw is provided with an elastic pad.

[0017] The present invention is further configured such that the locking component is a locking bolt and a locking nut, wherein the locking bolt passes through the free end of the limiting claw and the limiting plate and is fastened by the locking nut.

[0018] The present invention is further configured such that the slot is a V-shaped slot or an arc-shaped slot.

[0019] The present invention is further configured such that the lead screw has a bidirectional thread structure.

[0020] The present invention is further configured such that a drive handwheel is provided at one end of the lead screw.

[0021] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0022] 1. The valve body and valve cover are received by the slot of the base assembly, and radial clamping is formed with the first and second limiting assemblies, which restricts the radial displacement of the workpiece, solves the problem of misalignment of existing tooling, and improves the alignment accuracy of the valve body and valve cover.

[0023] 2. By cooperating with the lead screw, bearing and pressure nut of the axial pressing assembly, rotating the nut pushes the bearing to drive the valve body and valve cover to be axially pressed together, avoiding gaps or misalignment, solving the problem of unstable pressing, and ensuring welding sealing.

[0024] 3. By using the limiting plate and the hinged limiting claw, the workpiece can be quickly fixed or released with the locking component, which solves the problem of cumbersome clamping of traditional tooling and improves the convenience of operation. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the utility model in use;

[0026] Figure 2 This is a three-dimensional structural diagram of the present invention in a non-use state;

[0027] Figure 3 This is a cross-sectional view of the axial pressing assembly of this utility model.

[0028] The reference numerals in the figure are as follows: 1. Base assembly; 10. Fixed base; 11. Support plate; 2. Slot; 3. Radial limiting assembly; 30. First limiting assembly; 31. Second limiting assembly; 4. Axial pressing assembly; 40. Lead screw; 41. First bearing; 42. First pressure nut; 43. Second bearing; 44. Second pressure nut; 5. Connecting arm; 6. Limiting plate; 7. Limiting claw; 8. Locking element; 80. Locking bolt; 81. Locking nut; 9. Elastic gasket; 12. Drive handwheel; 13. Valve body; 14. Valve cover. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 :

[0030] Example 1:

[0031] This embodiment provides a ball valve welding fixture, including:

[0032] The base assembly 1 includes a fixed base 10 and two support plates 11 symmetrically fixed on the fixed base 10. The top of the two support plates 11 is provided with slots 2 for receiving the valve body 13 and the valve cover 14, respectively.

[0033] The radial limiting assembly 3 includes a first limiting assembly 30 disposed on the left support plate 11 for fixing the valve body 13, and a second limiting assembly 31 disposed on the right support plate 11 for fixing the valve cover 14.

[0034] The axial pressing assembly 4 includes a lead screw 40 passing through the central axis of the valve body 13 and the valve cover 14, a first bearing 41 and a first pressure nut 42 sequentially sleeved on one end of the lead screw 40, and a second bearing 43 and a second pressure nut 44 sequentially sleeved on the other end of the lead screw 40. The inner ring of the first bearing 41 abuts against the axial outer end face of the valve body 13, and the inner ring of the second bearing 43 abuts against the axial outer end face of the valve cover 14.

[0035] The first pressure nut 42 and the second pressure nut 44 on both sides are rotated to push the valve cover 14 and the valve body 13 to be axially pressed together.

[0036] The fixed base 10 serves as the basic support structure for the entire tooling, used to fix the support plate 11 and provide a stable working platform, ensuring that the valve body 13 and valve cover 14 maintain the correct relative position during welding. The fixed base 10 is typically flat and can be fixedly connected to an external platform by bolts or other means.

[0037] The support plate 11 supports the valve body 13 and valve cover 14, and restricts the radial displacement of the workpiece through the top groove 2, providing a basic positioning for subsequent radial clamping and axial pressing. The support plate 11 is generally plate-shaped, with a groove 2 on the top for receiving the valve body 13 and valve cover 14. The shape of the groove 2 is adapted to the outer surface of the valve body 13 and valve cover 14. The support plates 11 can be symmetrically distributed on the fixed base 10 by welding or bolting, located below the valve body 13 and valve cover 14 respectively, ensuring stable placement of the workpiece.

[0038] The radial limiting assembly 3 is used to radially clamp the valve body 13 and the valve cover 14 from both sides to prevent the workpiece from radially shaking or rotating during welding, thus ensuring welding accuracy. The radial limiting assembly 3 includes a first limiting assembly 30 provided on the left support plate 11 and a second limiting assembly 31 provided on the right support plate 11. The first limiting assembly 30 is used to secure the valve body 13 to the support plate 11, and the second limiting assembly 31 is used to secure the valve cover 14 to the support plate 11.

[0039] The axial pressing assembly 4 applies axial pressure to the valve body 13 and valve cover 14 through the mechanical transmission cooperation of the lead screw 40, the first bearing 41 and the second bearing 43, the first pressure nut 42 and the second pressure nut 44, so that they fit tightly together, eliminate welding gaps and ensure welding quality.

[0040] As the core component for power transmission, the lead screw 40 converts rotational motion into axial linear motion, driving the first bearing 41 and the second bearing 43, the first pressure nut 42 and the second pressure nut 44 to apply pressure to the workpiece. The lead screw 40 is generally a rod-shaped structure with threads machined on its surface, positioned along the central axis of the valve body 13 and the valve cover 14, passing through the through holes of both. The lead screw 40 can have a clearance fit with the valve body 13 and the valve cover 14 to ensure free passage.

[0041] The first bearing 41 and the second bearing 43 serve as the medium for transmitting axial force, converting the rotational motion of the first pressure nut 42 and the second pressure nut 44 into an axial thrust on the workpiece. Simultaneously, they allow the lead screw 40 to maintain relative rotation with the workpiece during rotation, preventing damage to the workpiece surface. The first bearing 41 and the second bearing 43 can be flat bearings or rolling bearings, typically deep groove ball bearings or cylindrical roller bearings. The inner ring mates with the lead screw 40, and the outer ring contacts the nut or the workpiece. The first bearing 41 and the second bearing 43 are respectively sleeved on both ends of the lead screw 40. The inner ring abuts against the axial outer end face of the valve body 13 and the valve cover 14, and the outer ring is adjacent to the first pressure nut 42 and the second pressure nut 44. The inner rings of the first bearing 41 and the second bearing 43 can be axially positioned with the lead screw 40 through an interference fit or a shoulder, ensuring synchronous rotation; the outer rings are in sliding contact with the pressure nut or the workpiece end face. This structure converts the rotational motion of the first pressure nut 42 and the second pressure nut 44 into a pure axial thrust on the end face of the workpiece, eliminating the torque transmission of rotational friction to the workpiece and ensuring that the workpiece remains stationary during the pressing process.

[0042] The first pressure nut 42 and the second pressure nut 44 cooperate with the lead screw 40 to convert rotational force into axial thrust, which pushes the valve body 13 and valve cover 14 axially and presses them together through the bearing. The first pressure nut 42 and the second pressure nut 44 are generally hexagonal or circular, with threaded holes machined inside to match the lead screw 40, and anti-slip textures or handle grooves can be provided on the outer surface for easy operation. The first pressure nut 42 and the second pressure nut 44 are located at both ends of the lead screw 40, adjacent to the outer ring of the bearing, and connected to the lead screw 40 through a threaded pair, moving axially along the lead screw 40 during rotation.

[0043] In this embodiment, the valve body 13 and valve cover 14 are first placed in the top slots 2 of the two support plates 11 of the base assembly 1 for initial positioning. Then, the valve body 13 and valve cover 14 are radially fixed by the first limiting component 30 of the left support plate 11 and the second limiting component 31 of the right support plate 11. Finally, the first pressure nut 42 and the second pressure nut 44 at both ends of the lead screw 40 in the axial pressing assembly 4 are rotated to push the first bearing 41 and the second bearing 43 to abut against the axial outer end faces of the valve body 13 and the valve cover 14 respectively, so that the two are pressed together axially, thereby completing the fixing preparation work before the ball valve is welded.

[0044] Example 2:

[0045] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] The support plates 11 are provided with symmetrically arranged connecting arms 5.

[0047] In this embodiment, the overall structural stability of the base assembly 1 is enhanced by symmetrically arranged connecting arms 5 between the support plates 11. The connecting arms 5 are typically rod-shaped or plate-shaped, distributed along the symmetrical axis of the two support plates 11, and their ends can be fixed to the inner sidewalls of the two support plates 11 by welding or bolts. When the axial pressing assembly 4 applies pressure to the valve body 13 and the valve cover 14, the support plates 11 will be subjected to outward lateral force. The connecting arms 5 can transmit and disperse this force between the two support plates 11, preventing the support plates 11 from tilting or deforming due to excessive force, ensuring that the support positioning accuracy of the slot 2 for the valve body 13 and the valve cover 14 is not affected, thereby ensuring the working stability of the radial limiting assembly 3 and the axial pressing assembly 4, and ultimately improving the consistency of welding quality.

[0048] Example 3:

[0049] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0050] The first limiting component 30 and the second limiting component 31 have the same structure, both including:

[0051] The limiting plate 6 is vertically fixed to the outside of the support plate 11 and located on one side of the slot 2;

[0052] The limiting claw 7 is hinged to the outside of the support plate 11 and located on the other side of the slot 2;

[0053] Locking element 8 is used to detachably connect the free end of the limiting claw 7 to the limiting plate 6;

[0054] The limiting plate 6 and the limiting claw 7 cooperate to form a radial clamping structure for the workpiece in the slot 2 of the supporting plate 11.

[0055] The first limiting component 30 and the second limiting component 31 are used to radially fix the valve body 13 in the slot 2 of the left support plate 11 and the valve cover 14 in the slot 2 of the right support plate 11, respectively, to prevent radial displacement or rotation of the workpiece during welding and to ensure accurate positioning. The first limiting component 30 and the second limiting component 31 have the same structure, both consisting of a limiting plate 6, a limiting claw 7 and a locking element 8, which are respectively installed on the outer side of the left and right support plates 11 and symmetrically distributed on both sides of the slot 2.

[0056] The limiting plate 6, acting as a radially limiting fixed end, cooperates with the limiting claw 7 to form a clamping space for the workpiece, providing stable radial support force. The limiting plate 6 is generally plate-shaped, perpendicular to the surface of the support plate 11, and its shape adapts to the outer contour of the workpiece to increase the contact area with the workpiece. The limiting plate 6 is fixed to the outside of the support plate 11, located on one side of the slot 2, maintaining a certain distance from the edge of the slot 2 to ensure it does not interfere with workpiece placement. The limiting plate 6 can be fixed to the outside of the support plate 11 by welding or bolts, ensuring that its relative position to the support plate 11 remains unchanged.

[0057] The limiting claw 7, as the movable end for radial limiting, clamps or releases the workpiece through hinged rotation, and works in conjunction with the limiting plate 6 to complete radial fixation. The limiting claw 7 is generally claw-shaped or plate-shaped, with one end being the hinged end and the other end being the free end. The shape of the inner surface that contacts the workpiece is adapted to the outer contour of the workpiece to enhance the fit. The limiting claw 7 can be connected to the outside of the support plate 11 via a hinge shaft, located on the other side of the slot 2, opposite to the limiting plate 6, forming an enclosing space for the workpiece within the slot 2. The free end can be connected to or separated from the limiting plate 6 via the locking element 8.

[0058] In this embodiment, after the valve body 13 and valve cover 14 are respectively placed into the slots 2 of the two side support plates 11, the limiting claw 7 on one side of the slot 2 is rotated so that its free end moves closer to the limiting plate 6 until the limiting claw 7 and the limiting plate 6 are respectively attached to the outer surface of the workpiece from both sides; the free end of the limiting claw 7 and the limiting plate 6 are fastened by the locking member 8, and the clamping force of the two forms a radial constraint on the workpiece to prevent the workpiece from moving radially during the welding process; when the axial pressing assembly 4 pushes the valve body 13 and valve cover 14 to press axially, the radial limiting assembly 3 keeps the radial position of the workpiece stable, ensuring that the two always maintain the correct relative position during the welding process, and finally achieves precise welding.

[0059] Example 4:

[0060] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0061] The contact surface of the limiting claw 7 is provided with an elastic pad 9.

[0062] In this embodiment, an elastic pad 9 is provided on the contact surface of the limiting claw 7 to optimize the clamping effect on the workpiece by utilizing its elastic deformation characteristics. The elastic pad 9 is usually made of flexible materials such as rubber or polyurethane, and its shape matches the contour of the contact surface of the limiting claw 7. It can be tightly connected to the limiting claw 7 by adhesive or embedded slot 2. When the limiting claw 7 forms a radial clamping of the workpiece with the limiting plate 6 through the locking member 8, the elastic pad 9 first contacts the workpiece surface and undergoes elastic deformation. The reaction force generated by this elastic deformation makes the pad surface adaptively conform to the outer contour of the workpiece, forming a uniformly distributed radial pressure, increasing the frictional resistance and preventing the workpiece from fretting. On the one hand, it buffers the direct impact force of the rigid limiting claw 7 on the workpiece, avoiding surface scratches or indentations; on the other hand, the reaction force generated by the elastic deformation makes the pad fit more tightly with the workpiece surface, increasing the frictional force, improving the stability of radial fixation, and dispersing local stress to prevent workpiece deformation due to stress concentration, ensuring the positioning accuracy and surface quality of the ball valve before welding.

[0063] Example 5:

[0064] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0065] The locking components 8 are a locking bolt 80 and a locking nut 81. The locking bolt 80 passes through the free end of the limiting claw 7 and the limiting plate 6 and is fastened by the locking nut 81.

[0066] In this embodiment, a locking bolt 80 and a locking nut 81 are used as locking components 8. The bolt passes through the free end of the limiting claw 7 and the limiting plate 6, and is then tightened with the nut to achieve reliable radial clamping of the workpiece. The locking bolt 80 is rod-shaped with threads on its surface, and the locking nut 81 has an internal thread structure. The two are connected by a threaded engagement. After passing through, a stable axial force can be applied by tightening the nut, causing the limiting claw 7 and the limiting plate 6 to tightly clamp the workpiece. Compared with other locking components 8 such as clips and pins, this design has the following advantages: the threaded connection provides adjustable locking force, allowing flexible control of the clamping strength according to the workpiece material and size, avoiding excessive tightness leading to workpiece deformation or excessive looseness causing unstable positioning; simultaneously, the bolt and nut engagement has self-locking properties, preventing loosening under welding vibration environments and ensuring the durability of the clamping state; furthermore, the structure is simple and versatile, and maintenance and replacement are convenient, further improving the practicality and reliability of the tooling.

[0067] Example 6:

[0068] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0069] The slot 2 is a V-shaped slot or an arc-shaped slot.

[0070] In this embodiment, by setting the slot 2 as a V-shaped slot or an arc-shaped slot to fit the cylindrical outer surface of the ball valve body 13 and the valve cover 14, the stability and positioning accuracy of the workpiece placement are improved. The V-shaped slot uses the included angle formed by the two inclined surfaces to automatically center the workpiece. Regardless of slight differences in the workpiece diameter, center positioning can be achieved through the contact of the inclined surfaces. The arc-shaped slot increases the contact area and enhances the wrapping of the workpiece by using a curved surface that matches the outer curvature of the workpiece. Both slot types can avoid the problem of workpiece slippage caused by the planar slot 2, ensuring that the valve body 13 and the valve cover 14 maintain a preliminary centering state before the radial limiting component 3 clamps, laying the foundation for subsequent precise fixation, while reducing hard contact wear between the workpiece and the slot 2 and protecting the surface quality of the workpiece.

[0071] Example 7:

[0072] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0073] The lead screw 40 has a bidirectional thread structure.

[0074] In this embodiment, by designing the lead screw 40 as a bidirectional threaded structure, the first pressure nut 42 and the second pressure nut 44 can move synchronously towards each other along the axial direction when the lead screw 40 rotates. When the lead screw 40 is rotated, the first pressure nut 42 and the second pressure nut 44 can simultaneously move closer to the center, pushing the first bearing 41 and the second bearing 43 to apply axial pressure to the valve body 13 and the valve cover 14 respectively, achieving synchronous clamping of the two. Compared with the operation of adjusting the nuts at both ends separately for the unidirectional threaded lead screw 40, this design can reduce the adjustment steps, ensure that the valve body 13 and the valve cover 14 are subjected to uniform force and accurate alignment during axial pressing, avoid misalignment caused by differences in adjustment speed on one side, significantly improve pressing efficiency and positioning accuracy, and ensure the tightness of the welded joint.

[0075] Example 8:

[0076] This embodiment provides a ball valve welding fixture, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0077] One end of the lead screw 40 is provided with a drive handwheel 12.

[0078] In this embodiment, when the lead screw 40 has a bidirectional thread structure, a drive handwheel 12 is provided at one end of the lead screw 40. This handwheel can synchronously drive the two pressure nuts on both sides to move towards each other, thereby achieving synchronous clamping of the valve body 13 and the valve cover 14, improving the convenience and labor-saving of the axial clamping operation. The drive handwheel 12 is usually in the shape of a circular disc, and its outer circumference may have raised protrusions or anti-slip textures for easy gripping. Its center can be connected to the end of the lead screw 40 by a key connection or bolt fixation. When the operator rotates the handwheel, the circumferential rotation of the handwheel can drive the lead screw 40 to rotate synchronously. Compared with directly rotating the pressure nuts, the handwheel increases the lever arm, which can drive the lead screw 40 to rotate with less force, making it easier for the first and second pressure nuts 44 to push the valve body 13 and the valve cover 14 to clamp axially. Especially in scenarios requiring a large clamping force, this can effectively reduce the intensity of operation. At the same time, the uniform rotation of the handwheel ensures that the clamping process is stable and controllable, avoiding workpiece misalignment caused by uneven force, and further improving the operating efficiency and user experience of the tooling.

[0079] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A ball valve welding fixture, characterized in that, include: The base assembly (1) includes a fixed base (10) and two support plates (11) symmetrically fixed on the fixed base (10). The top of the two support plates (11) is provided with slots (2) for receiving the valve body (13) and the valve cover (14). The radial limiting assembly (3) includes a first limiting assembly (30) disposed on the left support plate (11) and used to fix the valve body (13), and a second limiting assembly (31) disposed on the right support plate (11) and used to fix the valve cover (14). The axial pressing assembly (4) includes a lead screw (40) that passes through the central axis of the valve body (13) and the valve cover (14), a first bearing (41) and a first pressure nut (42) sequentially sleeved on one end of the lead screw (40), and a second bearing (43) and a second pressure nut (44) sequentially sleeved on the other end of the lead screw (40). The inner ring of the first bearing (41) abuts against the axial outer end face of the valve body (13), and the inner ring of the second bearing (43) abuts against the axial outer end face of the valve cover (14). Among them, rotating the first pressure nut (42) and the second pressure nut (44) on both sides pushes the valve cover (14) and the valve body (13) to be axially pressed together.

2. The ball valve welding fixing tool according to claim 1, characterized in that, The support plates (11) are provided with symmetrically arranged connecting arms (5).

3. The ball valve welding fixing tool according to claim 1, characterized in that, The first limiting component (30) and the second limiting component (31) have the same structure, both including: The limiting plate (6) is vertically fixed to the outside of the support plate (11) and located on one side of the slot (2); The limiting claw (7) is hinged to the outside of the support plate (11) and located on the other side of the slot (2); Locking element (8) is used to detachably connect the free end of the limiting claw (7) to the limiting plate (6); The limiting plate (6) and the limiting claw (7) cooperate to form a radial clamping structure for the workpiece in the slot (2) of the support plate (11).

4. The ball valve welding fixture according to claim 3, characterized in that, The contact surface of the limiting claw (7) is provided with an elastic pad (9).

5. The ball valve welding fixture according to claim 3, characterized in that, The locking components (8) are a locking bolt (80) and a locking nut (81). The locking bolt (80) passes through the free end of the limiting claw (7) and the limiting plate (6) and is fastened by the locking nut (81).

6. The ball valve welding fixture according to claim 1, characterized in that, The slot (2) is a V-shaped slot or an arc-shaped slot.

7. The ball valve welding fixture according to claim 1, characterized in that, The lead screw (40) has a bidirectional thread structure.

8. The ball valve welding fixture according to claim 7, characterized in that, One end of the lead screw (40) is provided with a drive handwheel (12).

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