Safe welding device for municipal water supply pipeline

Abstract

The invention relates to the technical field of pipeline processing, which comprises a top plate, in particular to a safe welding device for municipal water supply pipelines, two pipelines are arranged at the bottom of the top plate, the two pipelines are bilaterally symmetrically arranged, grooves are formed in the corresponding ends of the two pipelines, a guide plate is arranged at the bottom of the top plate, and the guide plate is arranged on the bottom of the top plate. According to the six-zone skip welding mechanism, the accurate six-zone skip welding sequence can be automatically executed by the mechanism, strict unification of the segment length, the welding position and the interval time is ensured, randomness in manual operation is thoroughly avoided, and in addition, the welding efficiency is greatly improved. The mechanical symmetrical skip welding realizes the optimal distribution of heat input and shrinkage stress, the ovality deformation and residual stress of the pipeline are greatly reduced, and the occurrence rate of defects such as weld cracks and incomplete penetration is reduced from the source.

Description

Technical Field

[0001] This invention relates to the field of pipeline processing technology, specifically to a safety welding device for municipal water supply pipelines. Background Technology

[0002] In the laying of large-diameter steel pipelines for municipal water supply and drainage, circumferential welding is a critical process. Construction in urban environments faces multiple constraints, including limited space, significant traffic disruptions, tight deadlines, and a shortage of skilled welders. Traditional welding methods rely heavily on welder experience, which presents several significant problems: during circumferential welding of large-diameter pipelines, concentrated heat input can cause elliptic deformation at the pipe end, axial misalignment, or increased edge misalignment, severely affecting pipeline straightness and subsequent installation.

[0003] When the number of welders is limited, it is difficult to achieve ideal symmetrical synchronous welding. If continuous welding is used or the sequence is improper, uneven residual stress will be generated in the weld area, which can easily lead to defects such as incomplete penetration and cracks, and pose a risk of leakage during long-term operation. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: A safety welding device for municipal water supply pipelines includes a top plate. Two pipelines are symmetrically arranged at the bottom of the top plate, with bevels at their corresponding ends. A guide plate is located at the bottom of the top plate. Six protrusions are fixedly connected to the inner side of the guide plate, arranged in a circular array around the center of the guide plate. An annular plate is located inside the guide plate, with an annular groove on its outer side and an annular groove on its left side. Several sliders are fixedly connected to the inner side of the guide plate, arranged in a circular array around the center of the guide plate. The corresponding sides of the sliders are slidably connected to the annular groove. A toothed ring is located on the left side of the annular plate, and an annular locking block is fixedly connected to the right side of the toothed ring, slidably connected to the annular groove. Two reinforcing mechanisms are located at the bottom of the top plate, and a fixing mechanism is located at the opposite ends of the two pipelines.

[0005] Preferably, the reinforcement mechanism includes a lifting plate with a trapezoidal cross-section. A lead screw is threadedly connected to the center of the top of the lifting plate, the top of the lead screw penetrates the top plate, and a handle is fixedly connected to the top of the lead screw. An anti-slip pad is provided on the outside of the handle.

[0006] Preferably, the lifting plate has oblique openings on both the front and rear sides, and cranks are provided on both the front and rear sides of the lifting plate. A fitting rod is provided through the inner cavity of the crank near the top and is fixedly connected to it. The crank is fitted with the oblique opening through the fitting rod. An anti-detachment plate is hinged to the bottom of the crank. One side of each of the two anti-detachment plates is fitted with the outer side of the pipe. A vertical rod is fixedly connected to the opposite side of each of the two lifting plates. The top of the vertical rod penetrates the inner cavity of the top plate and is fixedly connected to a limit block.

[0007] Preferably, two Z-shaped fixing plates are fixedly connected to both the front and rear sides of the top plate. Each pair of adjacent Z-shaped fixing plates are arranged symmetrically from left to right. The crank is hinged to the adjacent Z-shaped fixing plate. Splicing plates are inserted into both the left and right sides of the top plate. A connecting plate is inserted into the opposite side of the two splicing plates. A G-shaped groove is opened on the connecting plate, and a flipping block is hinged to the G-shaped groove.

[0008] Preferably, the fixing mechanism includes a fixing ring, and a plurality of limiting plates are fixedly connected to the outer side of the fixing ring. The plurality of limiting plates are arranged in a circular array with the center of the fixing ring as the center. A movable plate is slidably connected to the inner cavity of the limiting plate. A clamping plate is fixedly connected to one side of each of the plurality of movable plates. The outer side of the clamping plate is fixedly connected to the inner side of the pipe. A movable rod is fixedly connected to the side of each movable plate near the top plate.

[0009] Preferably, the inner cavity bearing of the fixed ring is connected to a transmission rod, and a circular plate is fixedly connected to one end of the transmission rod near the top plate. The outer side of the circular plate has several annular openings, and the movable rod fits into the adjacent annular openings. A rocker handle is fixedly connected to one end of the transmission rod away from the top plate. A limiting ring is fixedly sleeved on the outer side of the transmission rod, and several slots are opened on the outer side of the limiting ring. The slots are arranged in a circular array with the center of the limiting ring as the center.

[0010] Preferably, the top of the limiting ring is provided with a locking block, the locking block fits into the locking groove, a pull rod is fixedly connected to the side of the locking block away from the top plate, a fixing member is provided on the top of the locking block, two baffles are fixedly connected to the top of the fixing member, the locking block is slidably connected to the baffles, and an installation rod is fixedly connected to the top of the fixing member, the top end of the installation rod passes through the G-shaped groove.

[0011] Preferably, a plurality of toothed blocks are fixedly connected to the outer side of the guide plate, and the plurality of toothed blocks are arranged in a circular array with the center of the guide plate as the center. An adjusting motor is provided on the top of the guide plate, and the rear side of the adjusting motor is fixedly connected to the top plate. An adjusting gear is fixedly connected to the power output shaft of the adjusting motor, and the adjusting gear meshes with the adjacent toothed blocks.

[0012] Preferably, a plurality of gears mesh on the outer side of the gear ring, the plurality of gears being arranged in a cross shape, a rotating shaft being fixedly inserted through the center of each gear, the rotating shaft penetrating the inner cavity of the annular plate, a drive motor being arranged on the right side of the annular plate, the power output shaft of the drive motor being fixedly connected to the adjacent rotating shaft, the drive motor being fixedly connected to the annular plate, a limit switch being installed at the bottom of the top plate near the left side, the limit switch being electrically connected to an adjusting motor, an L-shaped connecting rod being fixedly connected to the right side of the annular plate, the other end of the L-shaped connecting rod being fixedly connected to the top plate.

[0013] Preferably, two sleeve blocks are fixedly connected to the left side of the toothed ring. The two sleeve blocks are arranged symmetrically, one above the other. A welding gun is installed through the inner cavity of each sleeve block. A roller is hinged to the side of the welding gun near the center of the guide plate. The roller fits against the protrusion. Upper mounting plates are fixedly connected to both the front and rear sides of the welding gun. Lower mounting plates are fixedly connected to both the front and rear sides of the sleeve blocks. A spring is fixedly connected between the upper and lower mounting plates. A fixing plate is fixedly connected to the left side of the upper sleeve block. A connecting rod is fixedly connected to the top of the fixing plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention enables the automatic execution of a precise six-zone skip welding sequence, ensuring strict uniformity in segment length, welding position, and interval time, completely avoiding the arbitrariness of manual operation. Furthermore, the mechanized symmetrical skip welding achieves optimal distribution of heat input and shrinkage stress, greatly reducing pipe elliptic deformation and residual stress, thereby reducing the incidence of defects such as weld cracks and incomplete penetration from the root cause. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the clamping plate structure of the present invention; Figure 3 This is a right view of the circular plate structure of the present invention; Figure 4 This is a schematic diagram of the mounting rod structure of the present invention; Figure 5 This is a bottom view of the connecting plate structure of the present invention; Figure 6 This is a schematic diagram of the annular plate structure of the present invention; Figure 7 This is a plan view of the annular plate structure of the present invention; Figure 8 This is a schematic diagram of the top plate structure of the present invention; Figure 9 This is a right view of the top plate structure of the present invention; Figure 10 This is a schematic diagram of the toothed ring structure of the present invention; Figure 11 This is a schematic diagram of the welding torch structure of the present invention; Figure 12 This is a bottom view of the top plate structure of the present invention; Figure 13 for Figure 4 Enlarged view of point A in the middle; Figure 14 for Figure 5 Enlarged view of section B in the middle.

[0016] The following are the labeling elements in the diagram: 1. Top plate; 2. Splicing plate; 3. Connecting plate; 4. Handle; 5. Pipe; 6. Mounting rod; 7. Guide plate; 8. Clamping plate; 9. Crank handle; 10. Transmission rod; 11. Fixing ring; 12. Movable plate; 13. Limiting plate; 14. Circular plate; 15. Fixing component; 16. Baffle; 17. Pull rod; 18. Limiting ring; 19. Locking block; 20. Limiting block; 21. Flipping block; 22. Annular plate; 23. Toothed block; 24. Sliding block; 25. Toothed ring; 26. Gear; 27. Drive motor; 28. Ring-shaped locking block; 29. ​​Adjusting motor; 30. Lead screw; 31. Adjusting gear; 32. Lifting plate; 33. Crank; 34. Anti-detachment plate; 35. Adhesive rod; 36. Vertical rod; 37. L-shaped connecting rod; 38. Linking rod; 39. Fixing plate; 40. Sleeve block; 41. Spring; 42. Lower mounting plate; 43. Upper mounting plate; 44. Roller; 45. Welding torch; 46. Limit switch; 47. Z-shaped fixing plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-14 The present invention provides a technical solution: A safety welding device for municipal water supply pipelines includes a top plate 1. Two pipes 5 are symmetrically arranged at the bottom of the top plate 1, with bevels at their corresponding ends. A guide plate 7 is located at the bottom of the top plate 1. Six protrusions are fixedly connected to the inner side of the guide plate 7, arranged in a circular array around the center of the guide plate 7. An annular plate 22 is located inside the guide plate 7, with an annular groove on its outer side and an annular recess on its left side. Several sliders 24 are fixedly connected to the inner side of the guide plate 7, arranged in a circular array around the center of the guide plate 7. The corresponding sides of each slider 24 are slidably connected to the annular groove. A toothed ring 25 is located on the left side of the annular plate 22, and an annular locking block 28 is fixedly connected to the right side of the toothed ring 25, slidably connected to the annular recess. Two reinforcing mechanisms are located at the bottom of the top plate 1, and a fixing mechanism is located at the opposite ends of the two pipes 5.

[0019] The reinforcement mechanism includes a lifting plate 32 with a trapezoidal cross-section. A lead screw 30 is threadedly connected to the center of the top of the lifting plate 32. The top of the lead screw 30 penetrates the top plate 1, and a handle 4 is fixedly connected to the top of the lead screw 30. An anti-slip pad is provided on the outside of the handle 4. Slanted openings are provided on the outer sides of the lifting plate 32 near the front and rear sides. Cranks 33 are provided on both the front and rear sides of the lifting plate 32. A fitting rod 35 is inserted through the inner cavity of the crank 33 near the top and fixedly connected to it. The crank 33 fits against the slanted openings through the fitting rod 35. An anti-detachment plate 34 is hinged to the bottom of the crank 33. The corresponding side of plate 34 is attached to the outside of pipe 5. The two lifting plates 32 are fixedly connected to vertical rods 36 on opposite sides. The top of the vertical rods 36 penetrates the inner cavity of the top plate 1 and is fixedly connected to limit blocks 20. Two Z-shaped fixing plates 47 are fixedly connected to the front and rear sides of the top plate 1. Each pair of adjacent Z-shaped fixing plates 47 are symmetrically arranged. The crank 33 is hinged to the adjacent Z-shaped fixing plates 47. Splicing plates 2 are inserted into the left and right sides of the top plate 1. Connecting plates 3 are inserted into the opposite sides of the two splicing plates 2. G-shaped grooves are opened on the connecting plates 3. Flipping blocks 21 are hinged to the G-shaped grooves.

[0020] The fixing mechanism includes a fixing ring 11. Several limiting plates 13 are fixedly connected to the outer side of the fixing ring 11. These limiting plates 13 are arranged in a circular array around the center of the fixing ring 11. Movable plates 12 are slidably connected to the inner cavity of each limiting plate 13. Clamping plates 8 are fixedly connected to corresponding sides of each movable plate 12. The outer side of each clamping plate 8 is fixedly connected to the inner side of the pipe 5. Movable rods are fixedly connected to the side of each movable plate 12 near the top plate 1. A transmission rod 10 is bearing-connected to the inner cavity of the fixing ring 11. A circular plate 14 is fixedly connected to the end of the transmission rod 10 near the top plate 1. Several annular openings are formed on the outer side of the circular plate 14. The movable rods connect to adjacent annular openings. The transmission rod 10 is fixedly connected to a crank handle 9 at the end away from the top plate 1. A limiting ring 18 is fixedly sleeved on the outside of the transmission rod 10. Several slots are opened on the outside of the limiting ring 18. The slots are arranged in a circular array with the center of the limiting ring 18 as the center. A locking block 19 is provided on the top of the limiting ring 18. The locking block 19 fits with the slot. A pull rod 17 is fixedly connected to the side of the locking block 19 away from the top plate 1. A fixing member 15 is provided on the top of the locking block 19. Two baffles 16 are fixedly connected to the top of the fixing member 15. The locking block 19 is slidably connected to the baffles 16. An installation rod 6 is fixedly connected to the top of the fixing member 15. The top of the installation rod 6 passes through a G-shaped groove.

[0021] A number of toothed blocks 23 are fixedly connected to the outer side of the guide plate 7. The toothed blocks 23 are arranged in a circular array with the center of the guide plate 7 as the center. An adjusting motor 29 is set on the top of the guide plate 7. The rear side of the adjusting motor 29 is fixedly connected to the top plate 1. The power output shaft of the adjusting motor 29 is fixedly connected to an adjusting gear 31. The adjusting gear 31 meshes with the adjacent toothed blocks 23. A number of gears 26 are meshed on the outer side of the toothed ring 25. The gears 26 are arranged in a cross shape. A rotating shaft is fixedly inserted through the center of the gear 26. The rotating shaft passes through the inner cavity of the annular plate 22. A drive motor 27 is set on the right side of the annular plate 22. The power output shaft of the drive motor 27 is fixedly connected to the adjacent rotating shaft. The drive motor 27 is fixedly connected to the annular plate 22. A limit switch is installed at the bottom of the top plate 1 near the left side. 46. ​​Limit switch 46 is electrically connected to regulating motor 29. An L-shaped connecting rod 37 is fixedly connected to the right side of annular plate 22. The other end of L-shaped connecting rod 37 is fixedly connected to top plate 1. Two sleeve blocks 40 are fixedly connected to the left side of toothed ring 25. The two sleeve blocks 40 are arranged symmetrically above and below. A welding gun 45 is installed through the inner cavity of sleeve block 40. A roller 44 is hinged to the side of welding gun 45 near the center of guide plate 7. The roller 44 fits against the protrusion. Upper mounting plates 43 are fixedly connected to both the front and rear sides of welding gun 45. Lower mounting plates 42 are fixedly connected to both the front and rear sides of sleeve block 40. A spring 41 is fixedly connected between upper mounting plate 43 and lower mounting plate 42. A fixing plate 39 is fixedly connected to the left side of upper sleeve block 40. A connecting rod 38 is fixedly connected to the top of fixing plate 39.

[0022] Working principle: The operator places two pipes 5 into the inner cavity of the guide plate 7 using a crane, and opens the flip block 21 to place the installation rod 6 into the inner cavity of the G-groove. When the installation rod 6 is fixed, the crank handle 9 can be manually rotated. When the crank handle 9 rotates, it drives the transmission rod 10 to rotate. When the transmission rod 10 rotates, it drives the circular plate 14 to rotate. When the circular plate 14 rotates, it can fit with the movable rod through the annular groove, thereby driving several movable plates 12 to move synchronously. When the movable plates 12 move, they can drive the adjacent clamping plates 8 to expand. When the clamping plates 8 move, they can initially move the two pipes 5. The clamping plate 8 is fixed to facilitate the connection of the two pipes 5 by the staff. When the clamping plate 8 is in contact with the inner side of the pipe 5, the locking block 19 can be moved by the pull rod 17. When the locking block 19 moves, it can be in contact with the outer groove of the limiting ring 18, thus fixing the limiting ring 18. When the limiting ring 18 is fixed, the transmission rod 10 can be fixed. When the handle 4 is manually rotated, the lead screw 30 can be rotated. When the lead screw 30 rotates, the lifting plate 32 can be moved. When the lifting plate 32 moves downward, the crank 33 can drive the two anti-detachment plates 34 to swing in opposite directions. The device swings around the hinge of the Z-shaped fixing plate 47. Reinforcement is achieved when the two anti-detachment plates 34 swing in opposite directions. When the drive motor 27 starts, it drives the adjacent gear 26 to rotate via the power output shaft. The rotation of gear 26 drives the gear ring 25 to rotate, and the rotation of gear ring 25 drives the welding torch 45 to rotate synchronously via the sleeve block 40. When the welding torch 45 moves, it contacts the protrusion via the roller 44, causing the welding torch 45 to move briefly and weld the bevels of the two pipes 5. Welding is performed symmetrically each time to balance the shrinkage stress. The appearance and mutual cancellation of the extremely short segments allow for a high concentration of heat, avoiding continuous directional shrinkage caused by long welds. When the welding torch 45 located above moves, it can drive the linkage rod 38 to move. When the linkage rod 38 moves, it can activate the limit switch 46. When the limit switch 46 is activated, it adjusts the motor 29. When the adjusting motor 29 is activated, it can drive the toothed block 23 to move through the adjusting gear 31. When the toothed block 23 moves, it can drive the guide plate 7 to rotate counterclockwise, adjusting the position of the protrusion, thereby completing the welding of the unwelded area and merging it with the first welding to form a complete weld.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safety welding device for municipal water supply pipelines, comprising a top plate (1), characterized in that: The top plate (1) has two pipes (5) at its bottom, which are symmetrically arranged. Each pipe (5) has a bevel at one end. A guide plate (7) is located at the bottom of the top plate (1). Six protrusions are fixedly connected to the inner side of the guide plate (7), arranged in a circular array around the center of the guide plate (7). An annular plate (22) is located inside the guide plate (7), with an annular groove on its outer side and an annular recess on its left side. A number of sliders (24) are fixedly connected to the inner side of the guide plate (7). The sliders (24) are arranged in a circular array with the center of the guide plate (7) as the center. The corresponding side of each slider (24) is slidably connected to the annular groove. A toothed ring (25) is provided on the left side of the annular plate (22). An annular locking block (28) is fixedly connected to the right side of the toothed ring (25). The annular locking block (28) is slidably connected to the annular groove. Two reinforcing mechanisms are provided at the bottom of the top plate (1). A fixing mechanism is provided at the opposite ends of the two pipes (5).

2. The municipal water supply pipeline safety welding device according to claim 1, characterized in that: The reinforcement mechanism includes a lifting plate (32), the lifting plate (32) has a trapezoidal cross-section, a screw rod (30) is threaded at the top center of the lifting plate (32), the top end of the screw rod (30) passes through the top plate (1), a handle (4) is fixedly connected to the top end of the screw rod (30), and an anti-slip pad is provided on the outside of the handle (4).

3. The municipal water supply pipeline safety welding device according to claim 2, characterized in that: The lifting plate (32) has slanted openings on its outer side near the front and rear sides. The lifting plate (32) has cranks (33) on its front and rear sides. The inner cavity of the crank (33) is provided with a fitting rod (35) near the top and is fixedly connected to it. The crank (33) is fitted with the slanted opening through the fitting rod (35). The crank (33) is hinged with an anti-detachment plate (34) near the bottom. The corresponding side of the two anti-detachment plates (34) is fitted with the outer side of the pipe (5). The opposite side of the two lifting plates (32) is fixedly connected with a vertical rod (36). The top of the vertical rod (36) penetrates the inner cavity of the top plate (1) and is fixedly connected with a limit block (20).

4. A safety welding device for municipal water supply pipelines according to claim 3, characterized in that: The top plate (1) has two Z-shaped fixing plates (47) fixedly connected to both the front and rear sides. Each pair of adjacent Z-shaped fixing plates (47) are arranged symmetrically from left to right. The crank (33) is hinged to the adjacent Z-shaped fixing plate (47). Splicing plates (2) are inserted into both the left and right sides of the top plate (1). A connecting plate (3) is inserted into the opposite side of the two splicing plates (2). A G-shaped groove is provided on the connecting plate (3). A flipping block (21) is hinged to the G-shaped groove.

5. A safety welding device for municipal water supply pipelines according to claim 4, characterized in that: The fixing mechanism includes a fixing ring (11), and a plurality of limiting plates (13) are fixedly connected to the outside of the fixing ring (11). The plurality of limiting plates (13) are arranged in a ring array with the center of the fixing ring (11) as the center. A movable plate (12) is slidably connected to the inner cavity of the limiting plate (13). A clamping plate (8) is fixedly connected to one side of each of the movable plates (12). The outer side of the clamping plate (8) is fixedly connected to the inner side of the pipe (5). A movable rod is fixedly connected to the side of the movable plate (12) near the top plate (1).

6. A safety welding device for municipal water supply pipelines according to claim 5, characterized in that: The inner cavity bearing of the fixed ring (11) is connected to a transmission rod (10). The end of the transmission rod (10) near the top plate (1) is fixedly connected to a circular plate (14). The outer side of the circular plate (14) has several annular openings. The movable rod fits into the adjacent annular opening. The end of the transmission rod (10) away from the top plate (1) is fixedly connected to a rocker handle (9). The outer side of the transmission rod (10) is fixedly fitted with a limiting ring (18). The outer side of the limiting ring (18) has several slots. The slots are arranged in a circular array with the center of the limiting ring (18) as the center.

7. A safety welding device for municipal water supply pipelines according to claim 6, characterized in that: The limiting ring (18) is provided with a locking block (19) at the top. The locking block (19) fits into the slot. A pull rod (17) is fixedly connected to the side of the locking block (19) away from the top plate (1). A fixing member (15) is provided at the top of the locking block (19). Two baffles (16) are fixedly connected to the top of the fixing member (15). The locking block (19) is slidably connected to the baffles (16). An installation rod (6) is fixedly connected to the top of the fixing member (15). The top end of the installation rod (6) passes through the G-shaped groove.

8. A safety welding device for municipal water supply pipelines according to claim 7, characterized in that: A number of toothed blocks (23) are fixedly connected to the outside of the guide plate (7). The toothed blocks (23) are arranged in a circular array with the center of the guide plate (7) as the center. An adjustment motor (29) is provided on the top of the guide plate (7). The rear side of the adjustment motor (29) is fixedly connected to the top plate (1). An adjustment gear (31) is fixedly connected to the power output shaft of the adjustment motor (29). The adjustment gear (31) meshes with the adjacent toothed blocks (23).

9. A safety welding device for municipal water supply pipelines according to claim 8, characterized in that: The outer side of the gear ring (25) is meshed with several gears (26), which are arranged in a cross shape. A rotating shaft is fixedly installed at the center of the gear (26), and the rotating shaft passes through the inner cavity of the annular plate (22). A drive motor (27) is installed on the right side of the annular plate (22). The power output shaft of the drive motor (27) is fixedly connected to the adjacent rotating shaft. The drive motor (27) is fixedly connected to the annular plate (22). A limit switch (46) is installed at the bottom of the top plate (1) near the left side. The limit switch (46) is electrically connected to the regulating motor (29). An L-shaped connecting rod (37) is fixedly connected to the right side of the annular plate (22). The other end of the L-shaped connecting rod (37) is fixedly connected to the top plate (1).

10. A safety welding device for municipal water supply pipelines according to claim 9, characterized in that: Two sleeve blocks (40) are fixedly connected to the left side of the toothed ring (25). The two sleeve blocks (40) are arranged symmetrically up and down. A welding gun (45) is provided through the inner cavity of the sleeve block (40). A roller (44) is hinged to the side of the welding gun (45) near the center of the guide plate (7). The roller (44) fits against the protrusion. An upper mounting plate (43) is fixedly connected to both the front and rear sides of the welding gun (45). A lower mounting plate (42) is fixedly connected to both the front and rear sides of the sleeve block (40). A spring (41) is fixedly connected between the upper mounting plate (43) and the lower mounting plate (42). A fixing plate (39) is fixedly connected to the left side of the upper sleeve block (40). A connecting rod (38) is fixedly connected to the top of the fixing plate (39).

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