A welding tool and welding apparatus for bellows and valve stems

Abstract

The application provides a welding tool and welding equipment for a corrugated pipe and a valve rod, and belongs to the technical field of plasma welding, and comprises a split pressing sleeve, an axial abutting structure and a circumferential locking structure; the split pressing sleeve comprises at least two arc-shaped components; each arc-shaped component can be sleeved on the corrugated pipe, and the plurality of arc-shaped components can form a tubular structure; each arc-shaped component is provided with a plug-in part which is plugged into a groove at a welding position of the corrugated pipe, and the plug-in part is provided with an avoiding groove for avoiding the welding position; the axial abutting structure is sleeved on the valve rod and is in threaded cooperation with the valve rod; the axial abutting structure is provided with a first contact surface which is in contact with an inner circumferential wall of the corrugated pipe, and a second contact surface which is in contact with an end of the split pressing sleeve; the circumferential locking structure is sleeved on the split pressing sleeve, and one end of the circumferential locking structure is connected with the axial abutting structure; through the above-mentioned arrangement, the coaxiality of the corrugated pipe and the valve rod can be ensured, and the radial displacement of the corrugated pipe is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of plasma welding, and particularly relates to a welding tool and welding equipment for a bellows and a valve rod. BACKGROUND

[0002] As a kind of efficient welding technology, plasma welding is widely used in metal processing, aerospace, automobile manufacturing and other fields. However, there are some deficiencies in the process of welding the bellows to the valve rod by using the existing plasma welding equipment. For example, after the operator sets the bellows on the valve rod, the valve rod is directly fixed on the chuck of the plasma welding equipment, and the valve rod is rotated by the rotation of the chuck to make the welding gun weld the bellows and the valve rod.

[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 rod. When the inner diameter of the bellows is greater than the diameter of the valve rod, there is a radial displacement between the bellows and the valve rod, and it is difficult to ensure the coaxiality between the bellows and the valve rod. SUMMARY

[0004] The embodiment of the present application provides a welding tool for a bellows and a valve rod, which aims to improve the coaxiality of the bellows and the valve rod after welding.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

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

[0007] A split pressing sleeve, comprising at least two arc-shaped components, each of which can be fitted on the bellows, and the plurality of arc-shaped components can form a tubular structure. Each arc-shaped component has an insertion part that is inserted into the groove at the welding position of the bellows, and the insertion part has an avoidance slot for avoiding the welding position;

[0008] An axial abutting structure, which is fitted on the valve rod and threadedly cooperates with the valve rod. The axial abutting 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 pressing sleeve;

[0009] A circumferential locking structure, which is fitted on the split pressing sleeve, one end of the circumferential locking structure is connected with the axial abutting structure.

[0010] In one possible implementation, the axial abutting structure comprises:

[0011] A guide sleeve, which is fitted on the valve rod. One end of the guide sleeve can be inserted into the bellows, and the outer circumferential wall of the insertion end of the guide sleeve is in contact with the inner circumferential wall of the bellows. The part of the guide sleeve outside the bellows has a stepped surface.

[0012] a compression cap sleeved on the guide sleeve, an inner circumferential wall of the compression cap being in contact with an outer circumferential wall of the bellows, one end of the compression cap being in abutment with an end of the split compression sleeve, and the other end of the compression cap being in abutment with the stepped surface of the guide sleeve;

[0013] a nut threadedly engaged with the valve stem, an end of the nut being capable of abutting against an end of the guide sleeve.

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

[0015] a guide sleeve sleeved on the valve stem, one end of the guide sleeve being capable of being inserted into the bellows, an outer circumferential wall of the inserted end of the guide sleeve being in contact with an inner circumferential wall of the bellows, and a portion of the guide sleeve outside the bellows having a stepped surface;

[0016] a compression cap sleeved on the guide sleeve, an inner circumferential wall of the compression cap being in contact with an outer circumferential wall of the bellows, one end of the compression cap being in abutment with an end of the split compression sleeve, and the other end of the compression cap being in abutment with the stepped surface of the guide sleeve;

[0017] wherein the inner circumferential wall of the guide sleeve has an inner thread for threadedly engaging with the valve stem.

[0018] In a possible implementation, the guide sleeve and the compression cap are in an integral structure, or the guide sleeve and the compression cap are in a split structure.

[0019] In a possible implementation, a gap exists between a bottom wall of a socket on the compression cap for engaging with the bellows and an end of the bellows; after the compression cap abuts against the split compression sleeve, the end of the compression cap is not in contact with the bellows.

[0020] In a possible implementation, the circumferential locking structure comprises:

[0021] a locking sleeve sleeved on the split compression sleeve, and an inner circumferential wall of the locking sleeve being in contact with an outer circumferential wall of each of the arc-shaped components;

[0022] wherein the inner circumferential wall of the locking sleeve has an inner thread, the outer circumferential wall of the compression cap has an outer thread, and the locking sleeve threadedly engages with the compression cap.

[0023] In a possible implementation, the inner circumferential wall of one end of the locking sleeve towards the welding position is in a tapered structure, and the outer circumferential wall of each of the arc-shaped components towards the welding position is also in a tapered structure.

[0024] wherein, after the locking sleeve and the compression cap are engaged in place, the tapered structure of the locking sleeve provides a radial abutment force to the tapered structure of the arc-shaped components.

[0025] In a possible implementation, the pressure cap has a protruding part on the outer circumferential wall of one end of the split pressure sleeve, and the protruding part has external threads; and the locking sleeve is threadedly connected with the protruding part.

[0026] Compared with the prior art, the welding tool for the bellows and the valve rod has the following advantages.

[0027] To achieve the above object, the technical scheme adopted by the present application is as follows.

[0028] The present application provides a welding device for a bellows and a valve rod, comprising:

[0029] A machine tool body;

[0030] A welding tool for fixing the relative position of the bellows and the valve rod;

[0031] A rotary chuck rotatably arranged on the machine tool body; the rotary chuck can clamp the valve rod, or the rotary chuck can clamp the welding tool;

[0032] A lifting mechanism slidably connected with the machine tool body along the axis direction of the rotary chuck; the lifting mechanism comprises a lifting end capable of sliding up and down, and a welding gun connected to the lifting end; the welding gun is aligned with the welding position of the bellows and the valve rod after being lowered into position.

[0033] The welding device provided by the present application has the same advantages as the welding tool, which will not be described here again.

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

[0035] A support seat;

[0036] A lifting frame slidably arranged on the support seat; 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 is rotatably connected with the support seat;

[0039] A drive motor is connected to the support base; the output shaft of the drive motor is connected to the gear. Attached Figure Description

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

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

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

[0043] Figure 4 for Figure 3 Enlarged diagram of section A in the middle;

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

[0045] Figure 6 for Figure 5 Enlarged diagram of section B in the middle;

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

[0047] Figure 8 for Figure 7 Enlarged diagram of section C;

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

[0049] Explanation of reference numerals in the attached drawings: 1. Split pressure sleeve; 11. Arc-shaped component; 12. Insertion part; 121. Clearance groove; 2. Axial clamping structure; 21. First contact surface; 22. Second contact surface; 23. Guide sleeve; 24. Pressure cap; 241. Insertion hole; 25. Nut; 26. Protruding component; 3. Circumferential locking structure; 31. Locking sleeve; 4. Bellows; 41. Groove; 42. Welding position; 5. Valve stem; 6. Stepped surface; 7. Machine tool body; 71. Rotary chuck; 72. Support table; 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 Implementation

[0050] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0051] Please refer to Figures 1 to 9 , a welding tool for bellows and valve stem is described. The welding tool for bellows and 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 components 11, each arc-shaped component 11 can be sleeved on the bellows 4, and the plurality of arc-shaped components 11 can form a tubular structure; each arc-shaped component 11 has a plug-in part 12 which is plugged into the groove 41 at the welding position 42 of the bellows 4, and the plug-in part 12 has an avoiding groove 121 for avoiding the welding position 42; the axial abutting structure 2 is sleeved on the valve stem 5 and threadedly cooperates with the valve stem 5; the axial abutting structure 2 has a first contact surface 21 which contacts the inner circumferential wall of the bellows 4, and a second contact surface 22 which 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 with the axial abutting structure 2.

[0052] The welding tool for bellows and valve stem provided by the present application, compared with the prior art, sets the split pressing sleeve 1 in the form of splicing of the plurality of arc-shaped components 11, which facilitates sleeving the arc-shaped components 11 on the bellows 4, and the circumferential locking structure 3 can play a circumferential limiting role on the plurality of arc-shaped components 11, so that the plurality of arc-shaped components 11 are firmly sleeved on the bellows 4; the axial abutting structure 2 threadedly cooperates with the valve stem 5, which can make the second contact surface 22 abut against the split pressing sleeve 1, and then make the welding end of the bellows 4 tightly contact the stepped surface 6 of the valve stem 5, so as to 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 shown in Figures 1 to 9 , the axial abutting structure 2 comprises a guide sleeve 23, a pressing 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 circumferential wall of the inserted end of the guide sleeve 23 contacts the inner circumferential wall of the bellows 4, and the portion of the guide sleeve 23 outside the bellows 4 has a stepped surface 6; the pressing cap 24 is sleeved on the guide sleeve 23; the inner circumferential wall of the pressing cap 24 contacts the outer circumferential wall of the bellows 4, one end of the pressing cap 24 abuts against the end of the split pressing sleeve 1, and the other end of the pressing cap 24 abuts against the stepped surface 6 of the guide sleeve 23; the nut 25 threadedly cooperates with the valve stem 5; the end of the nut 25 can abut against the end of the guide sleeve 23.

[0054] Through the above arrangement, in the process of tightening the nut 25, the guide sleeve 23 provides a pressing force to the compression cap 24, the compression cap 24 provides a pressing force to the split compression sleeve 1, the inserted part 12 at the end of the split compression sleeve 1 abuts against the bellows 4, so that the end of the bellows 4 is tightly attached to the stepped surface 6 of the valve stem 5, the outer circumferential wall of the end of the bellows 4 is coplanar with the outer circumferential wall of the stepped surface 6 of the valve stem 5, and the welding quality can be improved. By inserting the guide sleeve 23 into the bellows 4 and inserting the bellows 4 into the compression cap 24, the free end of the bellows 4 can be radially limited by the cooperation of the inner circumferential wall of the compression cap 24 and the outer circumferential wall of the guide sleeve 23, and the radial displacement of the bellows 4 can be reduced.

[0055] For example, the nut 25 can be a butterfly nut 25; the guide sleeve 23 can be provided with internal threads, and the guide sleeve 23 can be screwed with the valve stem 5 to omit the nut 25.

[0056] In some embodiments, as shown in Figures 1 to 9 The guide sleeve 23 and the compression cap 24 can be an integrated structure, or the guide sleeve 23 and the compression cap 24 can be a split structure.

[0057] It should be noted that when the guide sleeve 23 and the compression cap 24 are an integrated structure, they can be integrally installed and removed; when the guide sleeve 23 and the compression cap 24 are a split structure, the processing difficulty can be reduced, and when the guide sleeve 23 or the compression cap 24 is damaged, it can be replaced individually.

[0058] In some embodiments, as shown in Figures 1 to 9 There is a gap between the bottom wall of the insertion hole 241 of the compression cap 24 and the end of the bellows 4; after the compression cap 24 abuts against the split compression sleeve 1, the end of the bellows 4 does not contact the compression cap 24.

[0059] It should be noted that when the guide sleeve 23, the compression cap 24 and the split compression sleeve 1 are in the abutting state, the bellows 4 in the insertion hole 241 of the compression cap 24 has a gap with the bottom wall of the insertion hole 241, so the free end of the bellows 4 does not contact the compression cap 24; through the above arrangement, when the compression cap 24 abuts against the split compression sleeve 1, the compression cap 24 can avoid providing an abutting force to 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 bellows 4 can be adjusted according to actual needs; when a longer insertion length is needed, a longer guide sleeve 23 is selected; when a shorter insertion length is needed, 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 shown in Figures 1 to 9As shown, the circumferential locking structure 3 comprises a locking sleeve 31, which is sleeved on the split pressing sleeve 1, and the inner circumferential wall of the locking sleeve 31 is in contact with 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 connected 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 limiting for the split pressing sleeve 1, so as to avoid the situation that the split pressing sleeve 1 is separated from the bellows 4; after the locking sleeve 31 is threadedly connected with the pressing cap 24, the radial position between the locking sleeve 31 and the pressing cap 24 can be ensured, thereby improving the radial limiting ability of the locking sleeve 31 for the split pressing sleeve 1.

[0063] For example, when the guide sleeve 23, the pressing cap 24 and the split pressing sleeve 1 are in the abutting state, the locking sleeve 31 can be radially limited by the cooperation of the locking sleeve 31 and the pressing cap 24, thereby limiting the split pressing sleeve 1 by the locking sleeve 31, and finally the coaxiality between the bellows 4 and the valve rod 5.

[0064] In some embodiments, as shown in Figures 1 to 9 As shown, the inner circumferential wall of one end of the locking sleeve 31 towards the welding position 42 is a tapered structure, and the outer circumferential wall of each arc-shaped component 11 towards the welding position 42 is also a tapered structure; wherein after the locking sleeve 31 is cooperated with the pressing cap 24, the tapered structure of the locking sleeve 31 provides a radial abutting force for the tapered structure of the arc-shaped component 11.

[0065] It should be noted that the small end of the tapered structure of the arc-shaped component 11 is towards the welding position 42, and the large end is towards the pressing cap 24; the small end of the tapered structure of the locking sleeve 31 is towards the welding position 42, and the large end is towards the pressing cap 24; when the locking sleeve 31 is threadedly connected with the pressing cap 24, the tapered structure on the locking sleeve 31 and the tapered structure on the arc-shaped component 11 can be cooperated with each other, and after the locking sleeve 31 is tightened, the connection between the arc-shaped components 11 can be more compact, and the situation that the arc-shaped components 11 shake during welding can be reduced.

[0066] In some embodiments, as shown in Figures 1 to 9 As shown, the outer circumferential wall of one end of the pressing cap 24 towards the split pressing sleeve 1 has a protruding component 26, the protruding component 26 has an external thread, and the locking sleeve 31 is threadedly connected with the protruding component 26.

[0067] It should be noted that the protruding component 26 and the pressing cap 24 are an integral structure, and by providing the protruding component 26 on the pressing cap 24, the threaded part and the abutting part of the pressing cap 24 can be separated, thereby reducing the situation that the end thread is extruded and damaged during abutting.

[0068] Based on the same inventive concept, the application also provides a welding device, comprising a machine tool body 7, a welding tool for fixing the relative position of the bellows 4 and the valve rod 5, a rotary chuck 71 rotatably arranged on the machine tool body 7, and a lifting mechanism 8 slidably connected with the machine tool body 7 along the axial direction of the rotary chuck 71. The lifting mechanism 8 comprises a lifting end capable of sliding 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 position, it is aligned with the welding position 42 of the bellows 4 and the valve rod 5.

[0069] Illustratively, the lifting mechanism 8 comprises a support seat 81, a lifting frame 82, a rack 83, a gear 84, and a drive motor 85. The lifting frame 82 is slidably arranged on the support seat 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 connected to the support seat 81. The drive motor 85 is connected to the support seat 81. 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. The rotation of the gear 84 can be converted into the movement of the rack 83, thereby causing the lifting frame 82 to move up and down. The support seat 81 has a guide groove 86. The lifting frame 82 is fixedly provided with a sliding rail 87 which is slidably connected to the guide groove 86. Through the cooperation of the sliding rail 87 and the guide groove 86, the lifting frame 82 can be guided, making the sliding of the lifting frame 82 more stable. The support seat 81 is rotatably provided with two gears. The drive motor 85 only drives one of the gears.

[0071] Illustratively, the top end and the bottom end of the sliding rail 87 are fixedly provided with limit blocks 88 which can limit the movement of the sliding rail 87 to prevent the sliding rail 87 from being separated from the lifting frame 82.

[0072] Illustratively, the machine tool body 7 is fixedly provided with a support table 72. The support table 72 is provided with a drive frame 73. The drive frame 73 is rotatably provided with a screw (not shown in the figure). The bottom of the support seat 81 is fixedly provided with a sliding block (not shown in the figure). The sliding block has a threaded hole which is threadedly connected to the screw. The top of the drive frame 73 has a strip-shaped groove 731 for the sliding of the sliding block. The support table 72 is provided with a motor (not shown in the figure) for driving the screw to rotate. By driving the screw to rotate through the motor, the sliding block can be driven 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 position of the welding torch, the welding torch is positioned directly above the valve stem 5 and the corrugated tube 4 welding position 42, and then the welding torch is fixed on the lifting frame 82 by bolts. When welding, the welding torch moves downward to the welding position 42 to start welding; then the welding position 42 continues to rotate under the drive of the rotary chuck 71; after one rotation of the welding position 42, the welding is completed, and the welding torch is reset upward under the drive of the lifting frame 82.

[0074] The above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welding fixture for bellows and valve stems, characterized in that, include: The split compression sleeve includes at least two arc-shaped components, each of which can be fitted onto the bellows, and multiple arc-shaped components can form a tubular structure. Each arc-shaped component has an insertion part that fits into the groove at the welding position of the bellows, and the insertion part has a relief groove for avoiding the welding position; An axial clamping structure is sleeved on the valve stem and threadedly engaged with the valve stem; the axial clamping structure has a first contact surface that contacts the inner circumferential wall of the bellows and a second contact surface that contacts the end of the split pressure sleeve; A circumferential locking structure is sleeved on the split pressure sleeve, and one end of the circumferential locking structure is connected to the axial abutment structure; The axial clamping structure includes: A guide sleeve is fitted onto the valve stem; one end of the guide sleeve can be inserted into the bellows, and the outer peripheral wall of the inserted end of the guide sleeve contacts the inner peripheral wall of the bellows; the portion of the guide sleeve outside the bellows has a stepped surface. A pressure cap is fitted onto the guide sleeve; the inner peripheral wall of the pressure cap contacts the outer peripheral wall of the bellows, 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 stepped surface of the guide sleeve. The circumferential locking structure includes: A locking sleeve is fitted onto the split pressure sleeve, and the inner peripheral wall of the locking sleeve contacts the outer peripheral wall of each arc-shaped component. The locking sleeve has an internal thread on its inner peripheral wall, and the pressure cap has an external thread on its outer peripheral wall. The locking sleeve and the pressure cap are threaded together.

2. The welding fixture for bellows and valve stem as described in claim 1, characterized in that, The axial clamping structure also includes: A nut, threaded to the valve stem; the end of the nut abuts against the end of the guide sleeve.

3. The welding fixture for bellows and valve stem as described in claim 1, characterized in that, The inner circumferential wall of the guide sleeve has an internal thread that mates with the valve stem thread.

4. A welding fixture for bellows and valve stem as described in claim 2 or 3, characterized in that, The guide sleeve and the pressure cap are either an integral structure or separate structures.

5. A welding fixture for bellows and valve stem as described in claim 2 or 3, characterized in that, There is a gap between the bottom wall of the insertion hole on the pressure cap that mates with the corrugated pipe and the end of the corrugated pipe; after the pressure cap is pressed against the split pressure sleeve, the pressure cap and the end of the corrugated pipe do not contact each other.

6. A welding fixture for bellows and valve stem as described in claim 2 or 3, characterized in that, The inner peripheral wall of the locking sleeve facing the welding position is a conical structure, and the outer peripheral wall of each arc-shaped component facing the welding position is also a conical structure. Wherein, after the locking sleeve and the pressure cap are in place, the tapered structure of the locking sleeve provides radial clamping force to the tapered structure of the arc-shaped component.

7. A welding fixture for bellows and valve stem as described in claim 2 or 3, characterized in that, The pressure cap has a protruding part on the outer peripheral wall facing the split pressure sleeve. The protruding part has an external thread, and the locking sleeve is threadedly engaged with the protruding part.

8. A welding device for bellows and valve stems, characterized in that, include: Machine tool body; The welding fixture as described in any one of claims 1-7 is 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 fixture. The lifting mechanism is slidably connected to the machine tool body along the axis 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 position, it is aligned with the welding position of the bellows and the valve stem.

9. The welding equipment for bellows and valve stems as described in claim 8, characterized in that, The lifting mechanism includes: Support base; The lifting frame is slidably mounted on the support base; the bottom end of the lifting frame is the lifting end. A rack is connected to the lifting frame; The gear meshes with the rack; the gear rotates with the support base; A drive motor is connected to the support base; the output shaft of the drive motor is connected to the gear.

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