Support adjusting device for large-diameter steel pipe girth welding

Abstract

The utility model discloses a kind of support adjusting devices for large-diameter steel pipe girth weld, including first adjusting seat and the second adjusting seat of being located in the one side of first adjusting seat, it is movably connected between first adjusting seat and second adjusting seat by limiting rod, the other side of second adjusting seat is provided with second limiting seat, the side of first adjusting seat is provided with first limiting seat, second adjusting seat, second limiting seat, first adjusting seat and first limiting seat are all side by side arrangement between, second adjusting seat and second limiting seat and first adjusting seat and first limiting seat are all fixed by fixed rod butt joint, second adjusting seat, second limiting seat, first adjusting seat and first limiting seat upper portion are movably installed with the limiting portion for fixing large-diameter steel pipe;The utility model improves the girth weld precision of large-diameter steel pipe, and flexibly applies to different caliber large-diameter steel pipe.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe welding technology, and in particular to a support and adjustment device for circumferential welding of large-diameter steel pipes. Background Technology

[0002] The support and adjustment device for circumferential welding of large-diameter steel pipes is a device used in the welding process of large-diameter steel pipes to adjust the two large-diameter steel pipes. It can be used to align the two large-diameter steel pipes with each other and to connect their weld seams, which facilitates the circumferential welding process.

[0003] Application document CN108000044A discloses a large-diameter steel pipe welding device, including a base, a support, a welding mechanism, a motor, and two opposing support frames. The support is located on the base, the welding mechanism is fixed to the support, and the support frames are located on both sides of the welding mechanism. The motor is connected to the welding mechanism via wiring. This invention provides a large-diameter steel pipe welding device with support frames and a welding mechanism. The welding mechanism performs welding through the cooperation of a welding unit and a track. During the welding process, the welding unit operates around the steel pipe on the track, avoiding errors caused by manual operation and improving welding quality.

[0004] Similar to the large-diameter steel pipe welding device described above, it still has shortcomings in use. Lacking an auxiliary alignment structure, it cannot flexibly adapt to different diameters when welding two large-diameter steel pipes, making misalignment prone to occur during the butt joint. Secondly, when buttling two large-diameter steel pipes, the device can only connect one end, leaving the tail end unsupported. When wobbling occurs, the tail end of the large-diameter steel pipe will tilt to one side, preventing precise alignment of the two pipe ends. Furthermore, when aligning longer large-diameter steel pipes, bending deformation may occur in the middle. Since the device lacks a central support structure, the bent ends of the two large-diameter steel pipes cannot be precisely aligned, affecting the butt joint accuracy. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a support and adjustment device for circumferential welding of large-diameter steel pipes, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a support and adjustment device for circumferential welding of large-diameter steel pipes, including a first adjustment seat and a second adjustment seat disposed on one side of the first adjustment seat. The first adjustment seat and the second adjustment seat are movably connected by a limiting rod. A second limiting seat is disposed on the other side of the second adjustment seat, and a first limiting seat is disposed on one side of the first adjustment seat. The second adjustment seat, the second limiting seat, the first adjustment seat, and the first limiting seat are all arranged side by side. The second adjustment seat and the second limiting seat, as well as the first adjustment seat and the first limiting seat, are all fixedly connected by a fixing rod. A limiting part for fixing the large-diameter steel pipe is movably installed on the upper part of the second adjustment seat, the second limiting seat, the first adjustment seat, and the first limiting seat.

[0007] Preferably, the limiting part includes a first clamping plate and a second clamping plate, the first clamping plate is movably mounted on one side of the second clamping plate, and the lower ends of the first clamping plate and the second clamping plate are driven by a bidirectional lead screw.

[0008] Preferably, the second adjusting seat and the first adjusting seat are driven by a telescopic rod at their middle parts, and the bottom of the second adjusting seat and the second limiting seat are provided with movable casters, and the bottom of the first adjusting seat and the first limiting seat are provided with pads.

[0009] Preferably, the second adjusting seat and the limiting rod are movably connected by a sliding sleeve, and the first adjusting seat and the limiting rod are fixedly connected by a fixed sleeve.

[0010] Preferably, two sets of lifting blocks are movably installed on one side of both the first and second plates, and threaded sleeves that cooperate with the bidirectional lead screw are fixedly installed at the lower ends of both the first and second plates.

[0011] Preferably, the outer surfaces of the first and second plates are provided with sliding grooves, and the first plate and the lifting block, as well as the second plate and the lifting block, are locked and fixed by fastening bolts; the lower end of the lifting block is provided with a docking slip, and the interior of the first and second plates is provided with a slide rail for use with the docking slip. The inner surface of the docking slip is provided with a docking groove, and a movable block is movably installed in the docking groove. The movable block is rotatably connected to one end of the fastening bolt, and the other end of the fastening bolt passes through the docking slip and is threadedly engaged with it.

[0012] Preferably, a telescopic sleeve for use with a telescopic rod is installed in the middle of the first adjusting seat, and an electric motor is provided at one end of the telescopic sleeve. The user drives the telescopic sleeve to rotate using the electric motor. The telescopic sleeve has an internal thread, and the telescopic rod has an external thread. The telescopic sleeve and the telescopic rod are threaded together.

[0013] Preferably, a central support plate is provided between the second adjusting seat and the second limiting seat, as well as between the first adjusting seat and the first limiting seat, and the central support plate is spliced ​​and installed at the upper end of the two fixed rods.

[0014] Preferably, the upper outer surface of the central support plate is provided with a V-shaped groove, and the lower outer surface of the central support plate is provided with two sets of arc-shaped slots for use with the fixing rod.

[0015] Preferably, two sets of sliding pads are movably installed on the upper surface of the central support plate, and the lower end of the sliding pads is also provided with a docking slip. The interior of the central support plate is equipped with a slide rail for use with the docking slip. The upper surface of the central support plate is provided with a movable slide groove, and the inner surface of the docking slip is provided with a docking groove. A movable locking block is movably installed in the docking groove. The movable locking block is rotatably connected to one end of the fastening bolt, and the other end of the fastening bolt passes through the docking slip and is threadedly engaged with it.

[0016] The beneficial effects of this utility model are:

[0017] 1. By setting a first adjusting seat and a second adjusting seat, this utility model provides an adjustable pipe limiting and fixing structure for the support and adjustment device for circumferential welding of large-diameter steel pipes, thereby improving the circumferential welding accuracy of large-diameter steel pipes and flexibly adapting to large-diameter steel pipes of different diameters.

[0018] 2. By setting up a first limiting seat and a second limiting seat, this utility model optimizes the use of the first and second adjusting seats when the support and adjustment device for circumferential welding of large-diameter steel pipe is used, so that it has a tail end auxiliary fixing structure to prevent the pipe body from tilting.

[0019] 3. By setting a central support plate, this utility model provides a central auxiliary support structure for the support and adjustment device used for circumferential welding of large-diameter steel pipes, thereby preventing bending in the middle of long, large-diameter steel pipes and improving their docking stability.

[0020] 4. This utility model effectively supports two large-diameter steel pipes to prevent swaying during the docking operation. By limiting the tail ends of the two large-diameter steel pipes, it can prevent the tail ends from tilting and avoid misalignment during docking. The support plate set in the middle can prevent bending deformation in the middle of the large-diameter steel pipes when welding and aligning long large-diameter steel pipes, thus avoiding inaccurate docking due to bending deformation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a support and adjustment device for circumferential welding of large-diameter steel pipes.

[0022] Figure 2 This is a schematic diagram of the limiting part;

[0023] Figure 3 This is a schematic diagram of the overall structure of the second card plate;

[0024] Figure 4This is a schematic diagram of the planar structure of the first and second adjusting seats;

[0025] Figure 5 This is a schematic diagram of the overall structure of the central support plate;

[0026] Figure 6 This is a schematic diagram of the overall structure of the lifting block;

[0027] Figure 7 This is a schematic diagram of the overall structure of the sliding pad;

[0028] In the diagram: 1. Fixed rod; 2. First limiting seat; 3. Central support plate; 4. First adjusting seat; 5. Limiting rod; 6. Second adjusting seat; 7. Second limiting seat; 8. Limiting part; 9. First clamping plate; 10. Second clamping plate; 11. Two-way lead screw; 12. Movable caster; 13. Threaded sleeve; 14. Lifting block; 15. Fastening bolt; 16. Telescopic sleeve; 17. Movable block; 18. Sliding sleeve; 19. Telescopic rod; 20. Fixed sleeve; 21. Motor; 22. Arc-shaped groove; 23. Sliding pad; 24. Movable slide; 25. V-shaped groove; 26. Connecting slide buckle; 27. Connecting groove. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-7 As shown, a support and adjustment device for circumferential welding of large-diameter steel pipes includes a first adjustment seat 4 and a second adjustment seat 6 disposed on one side of the first adjustment seat 4. The first adjustment seat 4 and the second adjustment seat 6 are movably connected by a limiting rod 5. A second limiting seat 7 is disposed on the other side of the second adjustment seat 6, and a first limiting seat 2 is disposed on one side of the first adjustment seat 4. The second adjustment seat 6, the second limiting seat 7, the first adjustment seat 4, and the first limiting seat 2 are all arranged side by side. The second adjustment seat 6 and the second limiting seat 7, as well as the first adjustment seat 4 and the first limiting seat 2, are all fixed together by a fixing rod 1. A limiting part 8 for fixing the large-diameter steel pipe is movably installed on the upper part of the second adjustment seat 6, the second limiting seat 7, the first adjustment seat 4, and the first limiting seat 2.

[0031] Preferably, the limiting part 8 includes a first clamping plate 9 and a second clamping plate 10. The first clamping plate 9 is movably installed on one side of the second clamping plate 10, and the lower ends of the first clamping plate 9 and the second clamping plate 10 are driven by a bidirectional screw 11. To adapt to the circumferential welding operation of large-diameter steel pipes of different sizes, the limiting part 8 can be arbitrarily adjusted according to the size of the large-diameter steel pipe. During operation, the bidirectional screw 11 is driven by a motor to rotate, so that the bidirectional screw 11 simultaneously drives the first clamping plate 9 and the second clamping plate 10 to move synchronously towards each other, clamping the first clamping plate 9 and the second clamping plate 10 on the surface of the large-diameter steel pipe. Because of the synchronous movement of the first clamping plate 9 and the second clamping plate 10, the first clamping plate 9 and the second clamping plate 10 complete the centering and fixing of the large-diameter steel pipe, placing the large-diameter steel pipe in the middle position of the second adjusting seat 6, the second limiting seat 7, the first adjusting seat 4, and the first limiting seat 2.

[0032] Preferably, the second adjusting seat 6 and the first adjusting seat 4 are driven by a telescopic rod 19 at their middle parts, and the bottom of the second adjusting seat 6 and the second limiting seat 7 are provided with casters 12, while the bottom of the first adjusting seat 4 and the first limiting seat 2 are provided with pads. The pads ensure that the first adjusting seat 4 and the first limiting seat 2 are at the same height as the second adjusting seat 6 and the second limiting seat 7 equipped with casters 12. After the first adjusting seat 4 and the first limiting seat 2 are fixed to the second adjusting seat 6 and the second limiting seat 7 with large-diameter steel pipes, the telescopic rod 19 pulls the second adjusting seat 6, causing the steel pipes fixed on the second adjusting seat 6 and the second limiting seat 7 to move towards the steel pipes fixed on the first adjusting seat 4 and the first limiting seat 2, allowing the ends of the two steel pipes to connect and facilitating welding.

[0033] Preferably, the second adjusting seat 6 and the limiting rod 5 are movably connected via a sliding sleeve 18, and the first adjusting seat 4 and the limiting rod 5 are fixedly connected via a fixing sleeve 20. When the telescopic rod 19 moves the second adjusting seat 6, the limiting rod 5 forms a moving limiting structure between the first adjusting seat 4 and the second adjusting seat 6, preventing the second adjusting seat 6 from tilting during movement and improving the docking accuracy of large-diameter steel pipes.

[0034] Preferably, two sets of lifting blocks 14 are movably installed on one side of both the first clamping plate 9 and the second clamping plate 10, and threaded sleeves 13 that cooperate with the bidirectional lead screw 11 are fixedly installed at the lower ends of both the first clamping plate 9 and the second clamping plate 10. By using the lifting blocks 14, the use of the first clamping plate 9 and the second clamping plate 10 can be optimized, so that the sides of the first clamping plate 9 and the second clamping plate 10 have a limiting structure. At the same time, the distance between the two sets of lifting blocks 14 can be adjusted according to the size of the large-diameter steel pipe. When the first clamping plate 9 and the second clamping plate 10 come into contact with the large-diameter steel pipe ring, the two sets of lifting blocks 14 are clamped on the side of the steel pipe, so that the first clamping plate 9, the second clamping plate 10 and the large-diameter steel pipe form a multi-point fixing structure, preventing the steel pipe from shaking during welding.

[0035] Preferably, the outer surfaces of the first card plate 9 and the second card plate 10 are both provided with sliding grooves. The first card plate 9 and the lifting block 14, as well as the second card plate 10 and the lifting block 14, are all locked and fixed by fastening bolts 15. The lower end of the lifting block 14 is provided with a docking slip 26. The interior of the first card plate 9 and the second card plate 10 are both equipped with slide rails that cooperate with the docking slip 26. The inner surface of the docking slip 26 is provided with a docking groove 27. A movable card block 17 is movably installed in the docking groove 27. The movable card block 17 is rotatably connected to one end of the fastening bolt 15, and the other end of the fastening bolt 15 passes through the docking slip 26 and is threaded into it. The fastening bolt 15 can lock and fix the lifted block 14 after it has moved. In use, by rotating the fastening bolt 15, the fastening bolt 15 drives the movable card block 17 to move, so that the movable card block 17 is locked and fixed to the side of the slide rail, thereby completing the fixing operation of the lifting block 14.

[0036] Preferably, a telescopic sleeve 16 for use with the telescopic rod 19 is installed in the middle of the first adjusting seat 4, and a motor 21 is provided at one end of the telescopic sleeve 16. The user drives the telescopic sleeve 16 to rotate using the motor 21. The telescopic sleeve 16 has an internal thread, and the telescopic rod 19 has an external thread. The telescopic sleeve 16 and the telescopic rod 19 are threadedly engaged. In use, the motor 21 drives the telescopic sleeve 16 to rotate, and the telescopic sleeve 16 uses the threaded structure to adjust the length of the telescopic rod 19, thereby causing the telescopic rod 19 to drive the second adjusting seat 6 to move and adjust the position of the second adjusting seat 6.

[0037] Preferably, a central support plate 3 is provided between the second adjusting seat 6 and the second limiting seat 7, and between the first adjusting seat 4 and the first limiting seat 2. The central support plate 3 is spliced ​​and installed on the upper end of the two fixing rods 1. The central support plate 3 can help fix the large-diameter steel pipe and avoid the phenomenon of downward bending in the middle of the long large-diameter steel pipe during welding.

[0038] Preferably, the upper outer surface of the central support plate 3 is provided with a V-shaped groove 25, and the lower outer surface of the central support plate 3 is provided with two sets of arc-shaped slots 22 for use with the fixing rods 1. The arc-shaped slots 22 allow the two fixing rods 1 to be connected and fixed, so that the central support plate 3 is installed on the upper part of the two fixing rods 1. The V-shaped structure allows the large-diameter steel pipe to automatically move towards the center when placed on the upper end of the central support plate 3.

[0039] Preferably, two sets of sliding pads 23 are movably mounted on the upper surface of the central support plate 3. The lower end of each sliding pad 23 is also provided with a mating snap 26. The interior of the central support plate 3 is equipped with a slide rail that mates with the mating snap 26. The upper surface of the central support plate 3 is provided with a movable slide groove 24, and the inner surface of the mating snap 26 is provided with a mating groove 27. A movable locking block 17 is movably mounted within the mating groove 27. The movable locking block 17 is rotatably connected to one end of a fastening bolt 15, and the other end of the fastening bolt 15 passes through the mating snap 26 and is threaded into it. In use, rotating the fastening bolt 15 drives the movable locking block 17 to move, causing the movable locking block 17 to lock and fix itself to the side of the slide rail, thereby completing the fixing operation of the sliding pad 23.

[0040] The working principle of this utility model is as follows:

[0041] When in use, the traditional device does not have an auxiliary alignment structure. When welding two large-diameter steel pipes, it cannot flexibly adapt to large-diameter steel pipes of different diameters, which makes it easy for large-diameter steel pipes to misalign when they are joined.

[0042] Therefore, by setting the first adjusting seat 4 and the second adjusting seat 6, when the support and adjusting device for circumferential welding of large-diameter steel pipe is used, it is made to have an adjustable pipe limiting and fixing structure, thereby improving the circumferential welding accuracy of large-diameter steel pipe and flexibly adapting to large-diameter steel pipes of different diameters.

[0043] During operation, the user places two steel pipes on the upper ends of the second adjusting seat 6, the second limiting seat 7, the first adjusting seat 4, and the first limiting seat 2, respectively. The limiting part 8 can be adjusted arbitrarily according to the size of the large-diameter steel pipe. The motor drives the bidirectional lead screw 11 to rotate, causing the bidirectional lead screw 11 to simultaneously drive the first clamping plate 9 and the second clamping plate 10 to move synchronously towards each other, clamping the first clamping plate 9 and the second clamping plate 10 onto the surface of the large-diameter steel pipe. Because of the synchronous movement of the first clamping plate 9 and the second clamping plate 10, the large-diameter steel pipe is centered and fixed, placing it on the second adjusting seat 6 and the second limiting seat. 7. The steel pipe is centered at the middle position of the first adjusting seat 4 and the first limiting seat 2. Then, the pad 17 is used to make the first adjusting seat 4 and the first limiting seat 2 the same height as the second adjusting seat 6 and the second limiting seat 7 which are equipped with the moving casters 12. After the first adjusting seat 4 and the first limiting seat 2 are fixed to the large-diameter steel pipes of the second adjusting seat 6 and the second limiting seat 7 respectively, the second adjusting seat 6 is pulled by the telescopic rod 19, so that the steel pipes fixed on the second adjusting seat 6 and the second limiting seat 7 move to the steel pipes fixed on the first adjusting seat 4 and the first limiting seat 2, so that the ends of the two steel pipes are connected to each other, which facilitates the welding process.

[0044] When connecting two large-diameter steel pipes, traditional devices can only connect one end of the large-diameter steel pipe, and the tail end of the large-diameter steel pipe cannot be limited. When shaking occurs, the tail end of the large-diameter steel pipe will tilt to one side, making it impossible to accurately connect the ends of the two large-diameter steel pipes.

[0045] Therefore, by setting a first limiting seat 2 and a second limiting seat 7, when using the support and adjustment device for circumferential welding of large-diameter steel pipe, the use of the first adjustment seat 4 and the second adjustment seat 6 is optimized so that it has a tail end auxiliary fixing structure to prevent the pipe body from tilting.

[0046] In use, the first limiting seat 2 and the second limiting seat 7 are used to assist in fixing the tail of the tube body through the limiting part 8, so that both ends of the tube body form a fixed structure. Then, the limiting rod 5 is used to form a moving limiting structure between the first adjusting seat 4 and the second adjusting seat 6, so as to avoid the second adjusting seat 6 from tilting when moving, thereby improving the docking accuracy of the large-diameter steel pipe. The lifting block 14 is used to optimize the use of the first clamping plate 9 and the second clamping plate 10, so that the sides of the first clamping plate 9 and the second clamping plate 10 have a limiting structure. At the same time, the distance between the two sets of lifting blocks 14 can be adjusted according to the size of the large-diameter steel pipe. When the first clamping plate 9 and the second clamping plate 10 are in contact with the large-diameter steel pipe ring, the two sets of lifting blocks 14 are clamped on the side of the steel pipe, so that the first clamping plate 9, the second clamping plate 10 and the large-diameter steel pipe form a multi-point fixed structure, preventing the steel pipe from shaking during welding.

[0047] Meanwhile, when dealing with the welding and alignment of long, large-diameter steel pipes, the middle of the large-diameter steel pipes will bend and deform. Traditional devices do not have a middle support structure, and the ends of the two bent large-diameter steel pipes cannot be accurately connected, affecting their connection accuracy.

[0048] Therefore, by setting a central support plate 3, when the support and adjustment device for circumferential welding of large-diameter steel pipe is used, it has a central auxiliary support structure, which avoids bending in the middle of the long large-diameter steel pipe and improves its docking stability.

[0049] During operation, the central support plate 3 helps to fix the large-diameter steel pipe, preventing the middle of the long large-diameter steel pipe from bending downwards during welding. The arc-shaped groove 22 can be used to fix the two fixing rods 1 together, so that the central support plate 3 is installed on the upper part of the two fixing rods 1. The central support plate 3 can be installed in any position. The V-shaped structure makes the large-diameter steel pipe automatically move towards the center when placed on the upper end of the central support plate 3, thus keeping the middle of the two large-diameter steel pipes in a centered state.

[0050] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A support and adjustment device for circumferential welding of large-diameter steel pipes, comprising a first adjustment seat (4) and a second adjustment seat (6) disposed on one side of the first adjustment seat (4), characterized in that: The first adjusting seat (4) and the second adjusting seat (6) are movably connected by a limiting rod (5). A second limiting seat (7) is provided on the other side of the second adjusting seat (6). A first limiting seat (2) is provided on one side of the first adjusting seat (4). The second adjusting seat (6), the second limiting seat (7), the first adjusting seat (4) and the first limiting seat (2) are all arranged side by side. The second adjusting seat (6) and the second limiting seat (7) as well as the first adjusting seat (4) and the first limiting seat (2) are all connected and fixed by a fixing rod (1). A limiting part (8) for fixing a large-diameter steel pipe is movably installed on the upper part of the second adjusting seat (6), the second limiting seat (7), the first adjusting seat (4) and the first limiting seat (2).

2. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 1, characterized in that: The limiting part (8) includes a first clamping plate (9) and a second clamping plate (10). The first clamping plate (9) is movably installed on one side of the second clamping plate (10), and the lower ends of the first clamping plate (9) and the second clamping plate (10) are driven by a bidirectional lead screw (11).

3. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 1, characterized in that: The second adjusting seat (6) and the first adjusting seat (4) are driven by a telescopic rod (19) at their middle parts, and the bottom of the second adjusting seat (6) and the second limiting seat (7) are provided with movable casters (12), and the bottom of the first adjusting seat (4) and the first limiting seat (2) are provided with pads.

4. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 1, characterized in that: The second adjusting seat (6) and the limiting rod (5) are connected by a sliding sleeve (18), and the first adjusting seat (4) and the limiting rod (5) are fixedly connected by a fixing sleeve (20).

5. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 2, characterized in that: Two sets of lifting blocks (14) are movably installed on one side of the first plate (9) and the second plate (10). Threaded sleeves (13) that cooperate with the bidirectional screw rod (11) are fixedly installed at the lower ends of the first plate (9) and the second plate (10).

6. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 5, characterized in that: The outer surfaces of the first card plate (9) and the second card plate ((10)) are provided with sliding grooves. The first card plate ((9)) and the lifting block (14) and the second card plate (10) and the lifting block (14) are locked and fixed by fastening bolts (15). The lower end of the lifting block (14) is provided with a docking slide buckle (26). The interior of the first card plate (9) and the second card plate (10) is equipped with a slide rail for use with the docking slide buckle (26). The inner surface of the docking slide buckle (26) is provided with a docking groove (27). A movable card block (17) is movably installed in the docking groove (27). The movable card block (17) is rotatably connected to one end of the fastening bolt (15). The other end of the fastening bolt (15) passes through the docking slide buckle (26) and is threadedly engaged with it.

7. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 3, characterized in that: The first adjustment seat (4) is equipped with a telescopic sleeve (16) for use with the telescopic rod (19) in the middle. One end of the telescopic sleeve (16) is equipped with a motor (21). The user drives the telescopic sleeve (16) to rotate using the motor (21). The telescopic sleeve (16) has an internal thread inside, and the telescopic rod (19) has an external thread outside. The telescopic sleeve (16) and the telescopic rod (19) are threaded together.

8. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 1, characterized in that: A central support plate (3) is provided between the second adjusting seat (6) and the second limiting seat (7) as well as between the first adjusting seat (4) and the first limiting seat (2). The central support plate (3) is spliced ​​and installed on the upper end of the two fixed rods (1).

9. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 8, characterized in that: The upper outer surface of the central support plate (3) is provided with a V-shaped groove (25), and the lower outer surface of the central support plate (3) is provided with two sets of arc-shaped slots (22) for use with the fixing rod (1).

10. The support and adjustment device for circumferential welding of large-diameter steel pipes according to claim 8, characterized in that: Two sets of sliding pads (23) are movably installed on the upper surface of the central support plate (3). The lower end of the sliding pads (23) is also provided with docking slips (26). The interior of the central support plate (3) is equipped with slide rails that cooperate with the docking slips (26). The upper surface of the central support plate (3) is provided with a moving slide groove (24). The inner surface of the docking slips (26) is provided with a docking groove (27). A moving locking block (17) is movably installed in the docking groove (27). The moving locking block (17) is rotatably connected to one end of the fastening bolt (15). The other end of the fastening bolt (15) passes through the docking slips (26) and is threadedly engaged with it.

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