An eccentric calibration device for circumferential welds of cylindrical workpieces

Abstract

The utility model relates to an eccentric calibration device suitable for cylindrical workpiece circumference weld, and the device includes transition clamping end, chuck, dog, supporting ring, spring, supporting plate and wrench. The workpiece is installed in the automatic rotary workbench through the transition clamping end, the chuck is three-jaw self-centering type, and the dog is clamped in the workpiece welding position adjacent area through the wrench drive. The supporting ring is fixed on the upper center of chuck, and the inner wall bottom is the taper surface, so that the workpiece bottom is empty and only contacts through the edge line, and the upper diameter is slightly larger than the workpiece lower outer diameter to realize the quick positioning and anti - tilting. The spring and supporting plate are arranged at the bottom of chuck through -hole, and provide elastic support for the workpiece. The utility model overcomes the axis deflection problem caused by the workpiece bottom surface uneven through the cooperation of supporting ring and dog, guarantees the weld rotation center and workbench center concentric, and significantly improves the welding quality and batch production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mechanical automatic welding auxiliary technology, and in particular to an eccentric calibration device suitable for circumferential welds of columnar workpieces. Background Technology

[0002] During production, the top welding structure of a columnar workpiece is an end-to-end butt joint, with both inner and outer wall thicknesses of 2mm. It is formed using automated argon arc welding in batches. During welding, the welding torch remains stationary while the worktable rotates. Due to the sealing and strength requirements of the weld, the axis of the plane containing the weld must not deviate significantly from the center of rotation of the worktable during the workpiece's rotation, and the horizontality of the plane containing the weld must also be highly consistent.

[0003] However, the bottom of this type of workpiece has a raised non-metallic sulfide layer. Using a conventional three-jaw chuck, only the lower part of the column can be clamped. The contact between the jaws and the workpiece is line contact or even localized point contact, making it prone to tilting. This leads to severe misalignment of the end axis and prevents localized self-melting of the weld. Existing clamping methods have the following significant drawbacks:

[0004] It is impossible to directly clamp the workpiece in the vicinity of the welding position, making it difficult to guarantee the rotational accuracy of the weld area; the bottom surface of the workpiece is uneven and lacks an effective positioning and clearance structure, resulting in the deflection of the workpiece axis; the lack of effective auxiliary support for the workpiece during the clamping process increases the resistance and instability of the chuck clamping.

[0005] Therefore, there is an urgent need for a transitional eccentric calibration device that can directly clamp the area near the workpiece to be welded and avoid the influence of uneven bottom surface through a specific support ring structure, so as to achieve high-quality and high-efficiency batch welding of such workpieces. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides an eccentricity calibration device suitable for circumferential welds of cylindrical workpieces, comprising:

[0007] Transition clamping end, used for mounting to an automatic rotary table;

[0008] The chuck is a three-jaw self-centering chuck, which is located on one side of the transition clamping end;

[0009] The chuck, driven by the chuck, has a clamping height close to the workpiece to be welded, and its inner wall shape is adapted to the curvature of the upper outer wall of the workpiece.

[0010] A support ring is fixed to the center of one end surface of the chuck. The bottom of its inner wall is a conical surface, which is used to support the bottom edge of the workpiece and make the middle of the bottom surface of the workpiece free. The upper diameter of the inner wall is larger than the lower outer diameter of the workpiece to achieve rapid positioning and prevent tipping.

[0011] And a spring and a support plate disposed at the bottom of the through hole in the middle of the chuck, for elastically supporting the workpiece;

[0012] The support ring, the jaws, and the transition clamping end are aligned with each other, together achieving centering and clamping of the workpiece end.

[0013] In one embodiment of this utility model, the clamping part of the claw is made of brass.

[0014] In one embodiment of the present invention, a wrench for driving the chuck is also included, the wrench being capable of being connected to an electric rotary tool.

[0015] In one embodiment of this utility model, the conical structure of the support ring ensures that the non-metallic sulfide layer at the bottom of the workpiece does not directly contact the eccentric calibration device, thus avoiding axial deflection caused by uneven bottom surface.

[0016] In one embodiment of this utility model, the spring is located above the support plate and is used to provide initial support for the workpiece before the jaws clamp, thereby reducing clamping resistance.

[0017] In one embodiment of this utility model, the transition clamping end, the chuck and the support ring are fixed by welding or assembly to ensure overall rigidity and coaxiality.

[0018] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The eccentric calibration device of this utility model effectively overcomes the axial deflection caused by the unevenness of the bottom of the workpiece, and ensures that the plane where the weld is located is concentric with the rotation center of the worktable, thereby realizing high-quality and high-efficiency batch welding of such workpieces. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the eccentric calibration device applicable to the circumferential weld of a columnar workpiece.

[0021] As shown in the diagram, the markings are: 1. Transition clamping end; 2. Chuck; 3. Jaw; 4. Support ring; 5. Spring; 6. Support plate; 7. Wrench. Detailed Implementation

[0022] like Figure 1 As shown, this embodiment provides an eccentric calibration device suitable for circumferential welds of columnar workpieces, which mainly consists of a transition clamping end 1, a chuck 2, a jaw 3, a support ring 4, a spring 5, a support plate 6, and a wrench 7.

[0023] The device is clamped to the original automatic rotary table via the transition clamping end 1, with the upper part supporting the chuck 2. The chuck 2 is a three-jaw self-centering type, and the clamping and releasing of the jaws 3 is achieved by rotating the wrench 7 in both directions. One end of the wrench 7 can be inserted into the keyhole of the chuck, and the other end can be clamped to the electric rotary tool to achieve rapid operation.

[0024] The clamping height of the jaw 3 is slightly lower than the position of the workpiece to be welded, and its inner surface conforms to the curvature of the upper outer wall of the workpiece. The clamping part of the jaw 3 is preferably made of brass to avoid forming indentations on the surface of the workpiece.

[0025] The support ring 4 is welded and fixed to the upper center of the chuck 2. Its inner wall bottom has a conical structure, which allows the bottom of the workpiece to be suspended in the air, with only the edge making line contact with the support ring 4. At the same time, the upper diameter of its inner wall is slightly larger than the lower outer diameter of the workpiece, which facilitates the quick clamping and positioning of the workpiece and effectively prevents it from tipping over due to the bottom being suspended in the air.

[0026] The chuck 2, support ring 4, and transition clamping end 1 are aligned to ensure centering accuracy.

[0027] The spring 5 and the support plate 6 are located at the bottom of the central through hole of the chuck 2. The support plate 6 is welded and fixed to support the spring 5. The spring 5 provides elastic support for the inserted workpiece, which can significantly reduce the downward resistance when the jaws 3 are tightened.

[0028] The working process of this utility model is as follows:

[0029] The workpiece is placed into the support ring 4 of the chuck 2, with the outer edge of the workpiece's bottom making line contact with the conical surface of the inner wall of the support ring 4. At this time, the spring 5 provides upward elastic support for the workpiece, which is now suspended in the air. Subsequently, the chuck 2 is driven by the wrench 7, causing the jaws 3 to clamp the area adjacent to the workpiece to be welded. This invention effectively overcomes the axial deflection caused by unevenness at the bottom of the workpiece, ensuring that the plane where the weld is located is concentric with the rotation center of the worktable, thereby achieving high-quality and efficient batch welding of such workpieces.

[0030] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An eccentric calibration device suitable for circumferential welds on cylindrical workpieces, characterized in that, include: The transition clamping end (1) is used for mounting to the automatic rotary table; The chuck (2) is a three-jaw self-centering chuck, which is located on one side of the transition clamping end (1); The chuck (3) is driven by the chuck (2), and its clamping height is close to the workpiece to be welded position. At the same time, the inner wall shape is adapted to the curvature of the upper outer wall of the workpiece. The support ring (4) is fixed to the center of one end surface of the chuck (2). Its inner wall bottom is a conical surface, which is used to support the bottom edge of the workpiece and make the middle of the bottom surface of the workpiece free. And a spring (5) and a support plate (6) disposed at the bottom of the through hole in the middle of the chuck (2); The support ring (4), the claw (3) and the transition clamping end (1) are aligned with each other.

2. The eccentricity calibration device according to claim 1, characterized in that, The clamping part of the claw (3) is made of brass.

3. The eccentricity calibration device according to claim 1, characterized in that, It also includes a wrench (7) for driving the chuck (2), which is capable of connecting to an electric rotary tool.

4. The eccentricity calibration device according to claim 1, characterized in that, The conical structure of the support ring (4) ensures that the non-metallic sulfide layer at the bottom of the workpiece does not directly contact the eccentric calibration device.

5. The eccentricity calibration device according to claim 1, characterized in that, The spring (5) is located above the support plate (6) and is used to provide initial support for the workpiece before the jaws (3) clamp it.

6. The eccentricity calibration device according to claim 1, characterized in that, The transition clamping end (1), chuck (2) and support ring (4) are fixed together by welding or assembly.

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