Welding tool and welding equipment for corrugated pipe and valve rod

Abstract

The invention provides a welding tool and welding equipment for a corrugated pipe and a valve rod, and belongs to the technical field of plasma welding. The welding tool comprises a split pressing sleeve, an axial abutting structure and a circumferential locking structure; the split pressing sleeve at least comprises two arc-shaped components, each arc-shaped component can be arranged on the corrugated pipe in a sleeving mode, and the multiple arc-shaped components can form a tubular structure. Each arc-shaped component is provided with an inserting part matched with a groove in the welding position of the corrugated pipe in an inserting mode, and the inserting part is provided with an avoiding groove used for avoiding the welding position. The axial abutting structure is arranged on the valve rod in a sleeving mode and is in threaded fit with the valve rod. The axial abutting structure is provided with a first contact face making contact with the inner circumferential wall of the corrugated pipe and a second contact face making contact with the end of the split pressing sleeve. The split pressing sleeve is sleeved with the circumferential locking structure, and one end of the circumferential locking structure is connected with the axial abutting structure. Through the arrangement, the coaxiality of the corrugated pipe and the valve rod can be guaranteed, and the radial displacement of the corrugated pipe is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of plasma welding, and in particular relates to a welding tool and welding equipment for a bellows and a valve stem. Background Art

[0002] Plasma welding, as an efficient welding technology, is widely used in metal processing, aerospace, automobile manufacturing and other fields; however, existing plasma welding equipment has some shortcomings in the process of welding bellows to valve stems: for example, after the operator puts the bellows on the valve stem, he directly fixes the valve stem on the chuck of the plasma welding equipment, and the rotation of the chuck drives the valve stem to rotate, so that the welding gun can weld the bellows and valve stem.

[0003] However, the above welding process is only applicable to the case where the inner diameter of the bellows is equal to the diameter of the valve stem; when the inner diameter of the bellows is larger than the diameter of the valve stem, there is radial displacement between the bellows and the valve stem, and it is difficult to ensure the coaxiality between the bellows and the valve stem. Summary of the Invention

[0004] An embodiment of the present invention provides a welding tool for a bellows and a valve stem, aiming to improve the coaxiality of the bellows and the valve stem after welding.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A welding tool for a bellows and a valve stem is provided, comprising:

[0007] The split compression sleeve includes at least two arc-shaped parts, each of which can be sleeved on the corrugated pipe, and multiple arc-shaped parts can form a tubular structure; each arc-shaped part has a plug-in portion that plugs into the groove at the welding position of the corrugated pipe, and the plug-in portion has an avoidance groove for avoiding the welding position;

[0008] An axial abutment structure is sleeved on the valve stem and is threadedly engaged with the valve stem; the axial abutment structure has a first contact surface in contact with the inner circumferential wall of the bellows and a second contact surface in contact with the end of the split press sleeve;

[0009] A circumferential locking structure is sleeved on the split pressing sleeve, and one end of the circumferential locking structure is connected to the axial tightening structure.

[0010] In a possible implementation, the axial abutment structure includes:

[0011] A guide sleeve is sleeved on the valve stem; one end of the guide sleeve can be inserted into the bellows, and the outer peripheral wall of the guide sleeve insertion end contacts the inner peripheral wall of the bellows, and the portion of the guide sleeve outside the bellows has a stepped surface;

[0012] A pressure cap is sleeved on the guide sleeve; the inner peripheral wall of the pressure cap contacts the outer peripheral wall of the corrugated tube, one end of the pressure cap abuts against the end of the split pressure sleeve, and the other end of the pressure cap abuts against the step surface of the guide sleeve;

[0013] The nut is matched with the valve stem thread; the end of the nut can be tightly pressed against the end of the guide sleeve.

[0014] In a possible implementation, the axial abutment structure includes:

[0015] A guide sleeve is sleeved on the valve stem; one end of the guide sleeve can be inserted into the bellows, and the outer peripheral wall of the guide sleeve insertion end contacts the inner peripheral wall of the bellows, and the portion of the guide sleeve outside the bellows has a stepped surface;

[0016] A pressure cap is sleeved on the guide sleeve; the inner peripheral wall of the pressure cap contacts the outer peripheral wall of the corrugated tube, one end of the pressure cap abuts against the end of the split pressure sleeve, and the other end of the pressure cap abuts against the step surface of the guide sleeve;

[0017] Wherein, the inner peripheral wall of the guide sleeve has an internal thread that matches the valve stem thread.

[0018] In a possible implementation, the guide sleeve and the pressing cap are an integral structure, or the guide sleeve and the pressing cap are separate structures.

[0019] In a possible implementation, there is a gap between the bottom wall of the socket on the pressure cap that is plugged into the bellows and the end of the bellows; after the pressure cap is pressed against the split pressure sleeve, the pressure cap does not contact the end of the bellows.

[0020] In one possible implementation, the circumferential locking structure includes:

[0021] A locking sleeve is sleeved on the split pressing sleeve, and the inner peripheral wall of the locking sleeve contacts the outer peripheral wall of each arc-shaped component;

[0022] The inner peripheral wall of the locking sleeve has an internal thread, the outer peripheral wall of the pressing cap has an external thread, and the locking sleeve is threadedly matched with the pressing cap.

[0023] In a possible implementation, the inner peripheral wall of the locking sleeve facing the welding position is a tapered structure, and the outer peripheral wall of each arc-shaped component facing the welding position is also a tapered structure;

[0024] Wherein, after the locking sleeve and the pressing cap are fitted into place, the conical structure of the locking sleeve provides a radial pressing force to the conical structure of the arc-shaped component.

[0025] In a possible implementation, the pressure cap has a protruding part on its outer peripheral wall facing one end of the split pressure sleeve, the protruding part has an external thread, and the locking sleeve is threadedly engaged with the protruding part.

[0026] The present invention provides a welding tool for bellows and valve stems. Compared with the prior art, the split compression sleeve is arranged in the form of multiple arc-shaped parts spliced together, which is convenient for sleeveing the arc-shaped parts on the bellows. The circumferential locking structure is plugged into and matched with the multiple arc-shaped parts, which can play a circumferential limiting role on the multiple arc-shaped parts, so that the multiple arc-shaped parts are firmly sleeved on the bellows; the axial tightening structure is matched with the valve stem thread, so that the second contact surface can be pressed against the split compression sleeve, and then the welding end of the bellows is pressed against the step surface of the valve stem, which can ensure the welding quality during plasma welding; the first contact surface is in contact with the inner circumferential wall of the bellows, which can ensure the coaxiality of the bellows and the valve stem, and reduce the radial displacement of the bellows.

[0027] To achieve the above object, the technical solution adopted by the present invention is:

[0028] Provided is a welding device for a bellows and a valve stem, comprising:

[0029] Machine tool body;

[0030] Welding tooling, used to fix the relative position of the bellows and valve stem;

[0031] A rotary chuck is rotatably mounted on the machine tool body; the rotary chuck can clamp a valve stem, or the rotary chuck can clamp a welding tool;

[0032] The lifting mechanism is slidably connected to the machine tool body along the axial direction of the rotating chuck; the lifting mechanism includes a lifting end that can slide up and down, and a welding gun is connected to the lifting end. After the welding gun is lowered into place, it is aligned with the welding position of the bellows and the valve stem.

[0033] The beneficial effects of the welding equipment provided in this application are the same as those of the welding tooling, and will not be repeated here.

[0034] In a possible implementation, the lifting mechanism includes:

[0035] Support seat;

[0036] A lifting frame is slidably arranged on the support base; the bottom end of the lifting frame is a lifting end;

[0037] a rack connected to the lifting frame;

[0038] A gear meshing with the rack; the gear rotatably cooperates with the support seat;

[0039] A driving motor is connected to the support base; an output shaft of the driving motor is connected to the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a welding tool for a bellows and a valve stem provided in an embodiment of the present invention;

[0041] Figure 2 An exploded view of a welding tool for a bellows and a valve stem provided in an embodiment of the present invention;

[0042] Figure 3 A cross-sectional view of a welding tool for a bellows and a valve stem provided in an embodiment of the present invention;

[0043] Figure 4 for Figure 3 A magnified schematic diagram of part A in the middle;

[0044] Figure 5 A schematic diagram of a welding device for a bellows and a valve stem provided in an embodiment of the present invention;

[0045] Figure 6 for Figure 5 A magnified schematic diagram of part B in the middle;

[0046] Figure 7 A schematic diagram of a lifting frame portion of a welding device for a bellows and a valve stem provided in an embodiment of the present invention;

[0047] Figure 8 for Figure 7 Enlarged schematic diagram of the middle C part;

[0048] Figure 9 A schematic diagram of a rack portion of a welding device for a bellows and a valve stem provided in an embodiment of the present invention.

[0049] Explanation of the accompanying drawings: 1. Split pressing sleeve; 11. Arc-shaped component; 12. Connecting part; 121. Avoidance groove; 2. Axial tightening structure; 21. First contact surface; 22. Second contact surface; 23. Guide sleeve; 24. Pressing cap; 241. Socket; 25. Nut; 26. Protruding component; 3. Circumferential locking structure; 31. Locking sleeve; 4. Bellows; 41. Groove; 42. Welding position; 5. Valve stem; 6. Step surface; 7. Machine tool body; 71. Rotary chuck; 72. Support platform; 73. Drive frame; 731. Strip groove; 8. Lifting mechanism; 81. Support seat; 82. Lifting frame; 83. Rack; 84. Gear; 85. Drive motor; 86. Guide groove; 87. Slide rail; 88. Limit block. DETAILED DESCRIPTION

[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] Please also refer to Figures 1 to 9 Now, a welding tool for a bellows and a valve stem provided by the present invention is described. The welding tool for a bellows and a valve stem comprises a split pressing sleeve 1, an axial abutting structure 2 and a circumferential locking structure 3; the split pressing sleeve 1 comprises at least two arc-shaped parts 11, each of which can be sleeved on the bellows 4, and a plurality of arc-shaped parts 11 can form a tubular structure; each arc-shaped part 11 has a plug-in portion 12 that is plugged into the groove 41 at the welding position 42 of the bellows 4, and the plug-in portion 12 has a avoidance groove 121 for avoiding the welding position 42; the axial abutting structure 2 is sleeved on the valve stem 5 and threadedly matched with the valve stem 5; the axial abutting structure 2 has a first contact surface 21 that contacts the inner circumferential wall of the bellows 4, and a second contact surface 22 that contacts the end of the split pressing sleeve 1; the circumferential locking structure 3 is sleeved on the split pressing sleeve 1, and one end of the circumferential locking structure 3 is connected to the axial abutting structure 2.

[0052] The present invention provides a welding tool for bellows and valve stems. Compared with the prior art, the split pressing sleeve 1 is arranged in the form of a plurality of arc-shaped parts 11 spliced together, which is convenient for the arc-shaped parts 11 to be sleeved on the bellows 4. The circumferential locking structure 3 is plugged in and matched with the plurality of arc-shaped parts 11, which can play a role of circumferential limitation on the plurality of arc-shaped parts 11, so that the plurality of arc-shaped parts 11 are firmly sleeved on the bellows 4; the axial tightening structure 2 is threadedly matched with the valve stem 5, so that the second contact surface 22 can be pressed against the split pressing sleeve 1, and then the welding end of the bellows 4 is tightly attached to the step surface 6 of the valve stem 5, which can ensure the welding quality during plasma welding; the first contact surface 21 contacts the inner circumferential wall of the bellows 4, which can ensure the coaxiality of the bellows 4 and the valve stem 5, and reduce the radial displacement of the bellows 4.

[0053] In some embodiments, as Figures 1 to 9 As shown, the axial tightening structure 2 includes a guide sleeve 23, a pressure cap 24 and a nut 25; the guide sleeve 23 is sleeved on the valve stem 5; one end of the guide sleeve 23 can be inserted into the bellows 4, and the outer peripheral wall of the insertion end of the guide sleeve 23 contacts the inner peripheral wall of the bellows 4, and the part of the guide sleeve 23 on the outside of the bellows 4 has a step surface 6; the pressure cap 24 is sleeved on the guide sleeve 23; the inner peripheral wall of the pressure cap 24 contacts the outer peripheral wall of the bellows 4, one end of the pressure cap 24 abuts against the end of the split pressure sleeve 1, and the other end of the pressure cap 24 abuts against the step surface 6 of the guide sleeve 23; the nut 25 is threadedly matched with the valve stem 5; the end of the nut 25 can tighten the end of the guide sleeve 23.

[0054] Through the above arrangement, during the process of tightening the nut 25, the guide sleeve 23 provides a pressing force on the pressure cap 24, and the pressure cap 24 provides a pressing force on the split pressure sleeve 1. The plug-in portion 12 at the end of the split pressure sleeve 1 presses against the bellows 4, so that the end of the bellows 4 is tightly fitted on the step surface 6 of the valve stem 5. The outer peripheral wall of the end of the bellows 4 is coplanar with the outer peripheral wall of the step surface 6 of the valve stem 5, which can improve the welding quality. By inserting the guide sleeve 23 into the interior of the bellows 4 and inserting the bellows 4 into the pressure cap 24, the inner peripheral wall of the pressure cap 24 cooperates with the outer peripheral wall of the guide sleeve 23 to radially limit the free end of the bellows 4, thereby reducing the radial displacement of the bellows 4.

[0055] Exemplarily, the nut 25 may be a butterfly nut 25 ; an internal thread may be provided on the guide sleeve 23 , and the nut 25 may be omitted by threaded engagement between the guide sleeve 23 and the valve stem 5 .

[0056] In some embodiments, as Figures 1 to 9 As shown, the guide sleeve 23 and the pressing cap 24 are an integral structure, or the guide sleeve 23 and the pressing cap 24 are separate structures.

[0057] It should be noted that when the guide sleeve 23 and the pressure cap 24 are an integrated structure, they can be installed and disassembled as a whole; when the guide sleeve 23 and the pressure cap 24 are separately set, the processing difficulty can be reduced, and when the guide sleeve 23 or the pressure cap 24 is damaged, they can be replaced separately.

[0058] In some embodiments, as Figures 1 to 9 As shown, there is a gap between the bottom wall of the insertion hole 241 on the pressure cap 24 that is plugged into the bellows 4 and the end of the bellows 4; after the pressure cap 24 is pressed against the split pressure sleeve 1, the pressure cap 24 does not contact the end of the bellows 4.

[0059] It should be noted that when the guide sleeve 23, the pressure cap 24 and the split pressure sleeve 1 are in a pressed state, there is a gap between the bellows 4 in the socket 241 of the pressure cap 24 and the bottom wall of the socket 241, so there is no contact between the free end of the bellows 4 and the pressure cap 24; through the above arrangement, when the pressure cap 24 is pressed against the split pressure sleeve 1, the pressure cap 24 can be prevented from providing a pressing force on the free end of the bellows 4, thereby reducing the axial deformation of the bellows 4.

[0060] For example, the length of the guide sleeve 23 inserted into the corrugated tube 4 can be adjusted according to actual needs. When a longer insertion length is required, a longer guide sleeve 23 is selected; when a shorter insertion length is required, a shorter guide sleeve 23 is selected. After the guide sleeve 23 is selected, the length of the guide sleeve 23 itself does not change.

[0061] In some embodiments, as Figures 1 to 9As shown, the circumferential locking structure 3 includes a locking sleeve 31, which is sleeved on the split pressing sleeve 1, and the inner circumferential wall of the locking sleeve 31 contacts the outer circumferential wall of each arc-shaped component 11; wherein, the inner circumferential wall of the locking sleeve 31 has an internal thread, and the outer circumferential wall of the pressing cap 24 has an external thread, and the locking sleeve 31 is threadedly matched with the pressing cap 24.

[0062] It should be noted that after the locking sleeve 31 is sleeved on the split pressing sleeve 1, the locking sleeve 31 can provide circumferential limitation for the split pressing sleeve 1 to prevent the split pressing sleeve 1 from detaching from the bellows 4; after the locking sleeve 31 is threadedly engaged with the pressing cap 24, the radial position between the locking sleeve 31 and the pressing cap 24 can be guaranteed, thereby improving the radial limiting ability of the locking sleeve 31 on the split pressing sleeve 1.

[0063] For example, when the guide sleeve 23, the pressure cap 24 and the split pressure sleeve 1 are in a tight state, the locking sleeve 31 can be radially limited by the cooperation with the pressure cap 24, and then the locking sleeve 31 limits the split pressure sleeve 1, and finally the coaxiality between the bellows 4 and the valve stem 5 is achieved.

[0064] In some embodiments, such as Figures 1 to 9 As shown, the inner peripheral wall of the locking sleeve 31 facing the welding position 42 is a conical structure, and the outer peripheral wall of each arc-shaped component 11 facing the welding position 42 is also a conical structure; wherein, after the locking sleeve 31 and the pressure cap 24 are in place, the conical structure of the locking sleeve 31 provides a radial clamping force on the conical structure of the arc-shaped component 11.

[0065] It should be noted that the small end of the conical structure of the arc-shaped component 11 faces the welding position 42, and the large end faces the pressure cap 24; the small end of the conical structure of the locking sleeve 31 faces the welding position 42, and the large end faces the pressure cap 24; when the locking sleeve 31 is threadedly engaged with the pressure cap 24, the conical structure on the locking sleeve 31 can cooperate with the conical structure on the arc-shaped component 11. After tightening the locking sleeve 31, the connection between multiple arc-shaped components 11 can be made tighter, and the shaking of the arc-shaped component 11 can be reduced during the welding process.

[0066] In some embodiments, as Figures 1 to 9 As shown, a protruding part 26 is provided on the outer peripheral wall of the pressing cap 24 facing the split pressing sleeve 1 , and the protruding part 26 has an external thread, and the locking sleeve 31 is threadedly matched with the protruding part 26 .

[0067] It should be noted that the protruding part 26 and the pressing cap 24 are an integral structure. By providing the protruding part 26 on the pressing cap 24, the threaded part and the abutting part of the pressing cap 24 can be separated, thereby reducing the possibility of the end thread being squeezed and damaged during the abutting process.

[0068] Based on the same inventive concept, the present application also provides a welding device, including a machine tool body 7, a welding tool, a rotary chuck 71 and a lifting mechanism 8, the welding tool is used to fix the relative position of the bellows 4 and the valve stem 5; the rotary chuck 71 is rotatably set on the machine tool body 7; the rotary chuck 71 can clamp the valve stem 5, or the rotary chuck 71 can clamp the welding tool; the lifting mechanism 8 is slidingly connected to the machine tool body 7 along the axial direction of the rotary chuck 71; the lifting mechanism 8 includes a lifting end that can slide up and down, and a welding gun (not shown in the figure) is connected to the lifting end. After the welding gun is lowered into place, it is aligned with the welding position 42 of the bellows 4 and the valve stem 5.

[0069] Exemplarily, the lifting mechanism 8 includes a support base 81, a lifting frame 82, a rack 83, a gear 84 and a drive motor 85; the lifting frame 82 is slidably set on the support base 81; the bottom end of the lifting frame 82 is the lifting end; the rack 83 is connected to the lifting frame 82; the gear 84 is engaged with the rack 83; the gear 84 is rotatably matched with the support base 81; the drive motor 85 is connected to the support base 81; and the output shaft of the drive motor 85 is connected to the gear 84.

[0070] It should be noted that the drive motor 85 drives the gear 84 to rotate, which is converted into the movement of the rack 83, thereby causing the lifting frame 82 to move up and down. The support base 81 has a guide groove 86, and the lifting frame 82 is fixed with a slide rail 87, which slides with the guide groove 86. The cooperation between the slide rail 87 and the guide groove 86 can guide the lifting frame 82, making the sliding of the lifting frame 82 more stable. The support base 81 has two rotatable gears, and the drive motor 85 only drives one of the gears.

[0071] Exemplarily, the top and bottom ends of the slide rail 87 are fixed with limit blocks 88 , which can serve as a limit to prevent the slide rail 87 from detaching from the lifting frame 82 .

[0072] Exemplarily, a support platform 72 is fixedly provided on the machine tool body 7, a drive frame 73 is provided on the support platform 72, a screw (not shown in the figure) is rotatably provided on the drive frame 73, a slider (not shown in the figure) is fixedly provided on the bottom of the support seat 81, and the slider has a threaded hole that cooperates with the screw thread; the top of the drive frame 73 has a strip groove 731 for the sliding of the slider; the support platform 72 has a motor (not shown in the figure) for driving the screw to rotate, and the motor drives the screw to rotate, which can drive the slider to slide along the axial direction of the screw, thereby adjusting the position of the support seat 81.

[0073] It should be noted that after the operator adjusts the welding gun's position so that it is directly above the welding position 42 between the valve stem 5 and the bellows 4, the operator then bolts the welding gun to the lifting frame 82. During welding, the welding gun moves downward to the welding position 42 and welding begins. The welding position 42 then rotates continuously, driven by the rotary chuck 71. After the welding position 42 completes one rotation, welding is complete, and the welding gun returns upward, driven by the lifting frame 82.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A welding tool for bellows and valve stem, characterized in that: include: The split compression sleeve includes at least two arc-shaped components, each of which can be sleeved on the corrugated pipe, and multiple arc-shaped components can form a tubular structure; Each arc-shaped component has a plug-in portion that is plugged into the groove at the welding position of the bellows, and the plug-in portion has a avoidance groove for avoiding the welding position; An axial abutment structure is sleeved on the valve stem and is threadedly engaged with the valve stem; the axial abutment structure has a first contact surface in contact with the inner circumferential wall of the bellows and a second contact surface in contact with the end of the split press sleeve; A circumferential locking structure is sleeved on the split pressing sleeve, and one end of the circumferential locking structure is connected to the axial tightening structure.

2. A welding tool for a bellows and a valve stem according to claim 1, characterized in that: The axial tightening structure includes: A guide sleeve is sleeved on the valve stem; one end of the guide sleeve can be inserted into the bellows, and the outer peripheral wall of the guide sleeve insertion end contacts the inner peripheral wall of the bellows, and the portion of the guide sleeve outside the bellows has a stepped surface; A pressure cap is sleeved on the guide sleeve; the inner peripheral wall of the pressure cap contacts the outer peripheral wall of the corrugated tube, one end of the pressure cap abuts against the end of the split pressure sleeve, and the other end of the pressure cap abuts against the step surface of the guide sleeve; The nut is matched with the valve stem thread; the end of the nut can be tightly pressed against the end of the guide sleeve.

3. A welding tool for a bellows and a valve stem according to claim 1, characterized in that: The axial tightening structure includes: A guide sleeve is sleeved on the valve stem; one end of the guide sleeve can be inserted into the bellows, and the outer peripheral wall of the guide sleeve insertion end contacts the inner peripheral wall of the bellows, and the portion of the guide sleeve outside the bellows has a stepped surface; A pressure cap is sleeved on the guide sleeve; the inner peripheral wall of the pressure cap contacts the outer peripheral wall of the corrugated tube, one end of the pressure cap abuts against the end of the split pressure sleeve, and the other end of the pressure cap abuts against the step surface of the guide sleeve; Wherein, the inner peripheral wall of the guide sleeve has an internal thread that matches the valve stem thread.

4. A welding tool for a bellows and a valve stem according to claim 2 or 3, characterized in that: The guide sleeve and the pressing cap are an integral structure, or the guide sleeve and the pressing cap are separate structures.

5. A welding tool for a bellows and a valve stem according to claim 2 or 3, characterized in that: There is a gap between the bottom wall of the socket on the pressure cap that is plugged into the bellows and the end of the bellows; after the pressure cap is pressed against the split pressure sleeve, the pressure cap does not contact the end of the bellows.

6. A welding tool for a bellows and a valve stem according to claim 2 or 3, characterized in that: The circumferential locking structure comprises: A locking sleeve is sleeved on the split pressing sleeve, and the inner peripheral wall of the locking sleeve contacts the outer peripheral wall of each arc-shaped component; The inner peripheral wall of the locking sleeve has an internal thread, the outer peripheral wall of the pressing cap has an external thread, and the locking sleeve is threadedly matched with the pressing cap.

7. A welding tool for a bellows and a valve stem according to claim 6, characterized in that: The inner peripheral wall of the locking sleeve facing the welding position is a tapered structure, and the outer peripheral wall of each arc-shaped component facing the welding position is also a tapered structure; Wherein, after the locking sleeve and the pressing cap are fitted into place, the conical structure of the locking sleeve provides a radial pressing force to the conical structure of the arc-shaped component.

8. A welding tool for a bellows and a valve stem according to claim 6, characterized in that: The outer peripheral wall of the pressing cap facing one end of the split pressing sleeve is provided with a protruding part, the protruding part is provided with an external thread, and the locking sleeve is threadedly matched with the protruding part.

9. A welding device for a bellows and a valve stem, characterized in that: include: Machine tool body; The welding tool according to any one of claims 1 to 8, used to fix the relative position of the bellows and the valve stem; A rotary chuck is rotatably mounted on the machine tool body; the rotary chuck can clamp a valve stem, or the rotary chuck can clamp a welding tool; The lifting mechanism is slidably connected to the machine tool body along the axial direction of the rotating chuck; the lifting mechanism includes a lifting end that can slide up and down, and a welding gun is connected to the lifting end. After the welding gun is lowered into place, it is aligned with the welding position of the bellows and the valve stem.

10. The welding device for a bellows and a valve stem according to claim 9, characterized in that: The lifting mechanism comprises: Support seat; A lifting frame is slidably arranged on the support base; the bottom end of the lifting frame is a lifting end; a rack connected to the lifting frame; A gear meshing with the rack; the gear rotatably cooperates with the support seat; A driving motor is connected to the support base; an output shaft of the driving motor is connected to the gear.

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