Pipeline welding and positioning tool for ship building and repairing

Abstract

The invention relates to the field of ship pipeline welding, in particular to a pipeline welding positioning tool for ship building and repairing, which comprises a tool body, a fixing clamp is mounted on the tool body, a long rod is fixedly mounted on the tool body, the interior of the long rod is of a hollow structure, and a plurality of pulleys are fixedly mounted in the long rod. The driving motor drives the winch to rotate, the winch pulls the containing frame and the to-be-welded pipeline on the containing frame to move through the cable, the to-be-welded pipeline is stably pulled to the preset position, and after the pipeline reaches the target position, the pushing assembly operates to drive the centering clamping plate to conduct precise centering and reliable clamping on the pipeline. By means of the structure, accurate positioning and stable fixing in the pipeline hoisting process are effectively achieved, the welding precision is improved, and meanwhile the operation efficiency and safety are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of marine pipeline welding, specifically to a pipeline welding positioning fixture used in ship repair and construction. Background Technology

[0002] In the shipbuilding and repair industry, pipe welding is a crucial core process, and its quality directly affects the integrity of the ship's overall structure, the operational performance of the propulsion system, and the safety of long-term navigation. In actual shipboard operations, due to the unique spatial layout of the hull, various pipes are typically designed and fixedly installed in the overhead compartments. This common installation method requires operators to first move individual pipes, several meters long and considerable in weight, to a working position several meters high using simple lifting equipment or manual labor. While at height, they must rely on manual support or temporary supports for rough positioning. Poor alignment directly leads to defects such as stress concentration, incomplete root penetration, and poor inner wall formation, severely weakening the weld strength and creating potential leaks or even ruptures in the pipeline system during long-term operation.

[0003] Therefore, a pipe welding positioning fixture for ship repair and construction is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe welding positioning fixture for ship repair and construction, to solve the problem of rough positioning relying on manual support or temporary supports at high altitudes. This process is not only physically demanding, but also makes it difficult to control the swaying of the pipe at heights, hindering the achievement of the precise and stable alignment required for welding.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pipe welding positioning fixture for ship repair and construction includes a fixture body, a fixing clamp mounted on the fixture body, a long rod fixedly mounted on the fixture body, the long rod having a hollow internal structure, multiple pulleys fixedly mounted inside the long rod, a cable placed on the pulleys, a drive motor fixedly mounted inside the fixture body, a winch connected to the output shaft of the drive motor, one end of the cable fixedly mounted to the winch, and a placement frame fixedly mounted to the other end of the cable, sliding columns fixedly mounted on both sides of the fixture body, a through hole opened in the fixture body, a double-threaded rod rotatably connected to the through hole, a fixing plate slidably connected to the sliding column, the double-threaded rod being threadedly connected to the fixing plate, a centering clamping plate slidably connected to the fixing plate, forming a trumpet-shaped structure between the two centering clamping plates, a pushing assembly mounted inside the fixture body, the pushing assembly being connected to the centering clamping plates, and the pushing assembly pushing the centering clamping plates to move after the placement frame moves to a designated position.

[0006] In actual shipboard operations, due to the unique spatial layout of the hull, various pipelines are typically designed and installed in the overhead areas of passageways to avoid interfering with personnel passage and equipment operation. This installation method necessitates that operators first transport the pipeline to be welded to a high position before performing precise alignment and welding. To address this challenge, the operating procedure of this fixture is as follows: First, the fixture body is installed onto the completed pipeline using a clamping device. The drive motor is then started, causing the winch to rotate. The winch pulls the placement frame and the pipeline to be welded via a cable, smoothly guiding the pipeline to the predetermined position. Once the pipeline reaches the target position, the component is activated, driving the alignment clamping plate to precisely align and reliably clamp the pipeline. This structure effectively achieves precise positioning and stable fixation during pipeline hoisting, significantly improving operational efficiency and safety while enhancing welding accuracy.

[0007] Preferably, the pushing assembly includes a hydraulic rod, which is fixedly mounted on a fixed plate. A pushing plate is mounted on the movable end of the hydraulic rod. Connecting plates are slidably connected to both sides of the pushing plate. The connecting plates at both ends are fixedly mounted to centering clamping plates on both sides. Multiple evenly arranged sliding frames are mounted on the centering clamping plates. Rollers are fixedly mounted on the sliding frames. Grooves are formed on the sidewalls of the rollers in the middle of both sides. Rubber strips are fixedly mounted in the grooves. A first gear set is fixedly mounted on the rotating shaft of the roller. A first fixing block is fixedly mounted on the fixed plate. A first rack that meshes with the first gear set is slidably connected to the first fixing block.

[0008] In practical applications, after the hydraulic rod is activated, its movable end drives the push plate forward. Since the connecting plates are slidably connected to both sides of the push plate, and the connecting plates are fixedly installed with the centering clamping plates, the movement of the push plate synchronously drives the centering clamping plates on both sides to move towards one side. The sliding frame and roller design on the centering clamping plates allow the pipe to slide smoothly during clamping, reducing frictional resistance. In particular, the rubber strips in the grooves on the sidewalls of the rollers not only increase friction with the pipe, ensuring clamping stability, but also protect the pipe surface from damage to a certain extent. The meshing of the first gear set and the first rack ensures that when the centering clamping plate moves towards the pipe to be welded on one side, one of the gears in the first gear set rotates in the opposite direction to the welding direction of the centering clamping plate. This causes the first gear to drive the roller to rotate, pulling and moving the pipe to be welded on one side, making the connection between the two pipes tighter, improving the welding effect, and achieving precise pipe centering and reliable clamping.

[0009] Preferably, a contact plate is installed at one end of the long rod, and a circular hole is opened on the contact plate for the cable to pass through. Two symmetrically arranged ball bearings are rolled in the circular hole. A guide tube is fixedly installed on the placement frame, and the cable passes through the guide tube. Two symmetrically arranged guide grooves are opened on the guide tube. When the cable pulls the placement frame to a designated position, the ball bearings enter the guide grooves.

[0010] During pipeline installation, after the guide tube rises into the contact plate, the ball bearings enter the guide groove, providing precise positioning and guidance for the contact plate. This prevents the placement frame from wobbling or shifting after being moved into place, further ensuring the accuracy of pipeline welding positioning. Simultaneously, this design makes the cable pull on the placement frame smoother, reducing energy loss due to friction and improving the overall operational efficiency and stability of the positioning fixture. Furthermore, the cooperation between the guide groove and the ball bearings effectively distributes the tension on the cable, extending its service life and reducing maintenance and replacement costs.

[0011] Preferably, an annular plate is fixedly installed at one end of the long rod, and a sliding plate is slidably connected to the annular plate. The sliding direction of the sliding plate is consistent with the length direction of the long rod, and a silicone block is fixedly installed between the sliding plate and the contact plate.

[0012] Precise positioning is often required during pipe welding. In the design described above, a ring plate fixed to one end of a long rod and a sliding plate slidably connected to the ring plate provide a more flexible adjustment method for the positioning fixture. When the pipes to be welded are hoisted to the designated position, there will be a certain gap at the connection point of the two pipes. Rollers can bring the two pipes closer together, but at this point, the guide tube has already entered the contact plate, preventing the pipes to be welded from moving. Therefore, the sliding plate and the silicone block between the sliding plate and the contact plate allow the sliding plate to slide along the length of the long rod, while the silicone block allows the pipes to swing to a certain extent, ensuring that the central axes of the two pipes are on the same axis during welding.

[0013] Preferably, a threaded column is rotatably connected to the centering clamping plate, and the sliding frames on both sides are threadedly connected to the threaded column. A limit post is fixedly installed on the sliding frame, and the limit post is slidably connected to the centering clamping plate. A second gear is fixedly installed on the threaded column, and a second fixing block is fixedly installed on the fixing plate. A second rack that meshes with the second gear is slidably connected to the second fixing block.

[0014] In pipe welding, alignment is a crucial step, especially when there are slight discrepancies in the diameters of two pipes. In the design described above, a threaded column rotatably connected to the alignment clamping plate, along with sliding frames on both sides threaded to the threaded column, forms an adjustable alignment mechanism. When the threaded column is rotated, the sliding frames move along the direction of the threaded column due to the action of the threads. A limiting post fixed to the sliding frame ensures its stability during movement, preventing deviation. Simultaneously, a second gear fixed to the threaded column meshes with a second rack sliding on a second fixed block on the fixed plate. Pushing the second rack rotates the threaded column, adjusting the position of the sliding frame and ultimately changing the position of the rollers to achieve precise pipe alignment.

[0015] Preferably, the groove of the pulley is V-shaped, and multiple raised stripes are formed in the groove of the pulley on the side of the long rod away from the fixing clamp, and the central axis of the multiple stripes coincides with the central axis of the pulley.

[0016] This design makes the pulley more stable when guiding the cable. The V-shaped groove effectively prevents the cable from slipping, while the multiple raised stripes increase the friction between the pulley and the cable, ensuring that the cable can maintain a straight line during the pulling process and will not rotate. This, in turn, ensures the stability and accuracy of the entire positioning fixture during operation.

[0017] Preferably, a cable is fixedly installed on the tooling body, one end of the cable is connected to the drive motor and the hydraulic rod, and the other end of the cable is fixedly installed with a control box, which contains a control panel and a battery pack, and the control box is placed on the ground of the hull.

[0018] The control panel allows for precise control of the drive motor and hydraulic rods, enabling flexible adjustment of the clamping force of the tooling body to adapt to the welding positioning requirements of pipes of different specifications. The battery pack provides stable power support for the entire control system, ensuring continuous and stable operation of the control box in the complex environment of shipbuilding and repair sites. Furthermore, the control box's location on the ground avoids obstruction and ensures the smooth progress of welding positioning operations.

[0019] Preferably, a second spring telescopic rod is fixedly installed at the end of the long rod away from the fixing clamp, an electromagnet is fixedly installed at the movable end of the second spring telescopic rod, and a screw is threaded onto the fixed end of the second spring telescopic rod.

[0020] By adjusting the screw, the initial compression of the second spring telescopic rod can be changed to adapt to the adsorption requirements of pipes of different specifications. When energized, the electromagnet generates a strong magnetic force, which can quickly adsorb onto the ship's steel structure, providing a stable support point for the entire positioning fixture. This allows the cable to pull heavier steel pipes up for welding. When the power is off, the magnetic force disappears, facilitating the rapid transfer and repositioning of the fixture in different locations, greatly improving the flexibility and efficiency of pipe welding positioning.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The drive motor rotates the winch, which pulls the placement frame and the pipe to be welded on it via a cable, smoothly guiding the pipe to the predetermined position. Once the pipe reaches the target position, the actuator operates, driving the centering clamping plate to precisely center and reliably clamp the pipe. This structure effectively achieves precise positioning and stable fixation during pipe hoisting, significantly improving work efficiency and safety while enhancing welding accuracy.

[0022] 2. The sliding frame and roller design on the centering clamping plate causes one of the gears in the first gear set to rotate in the opposite direction to the welding direction of the centering clamping plate. This causes the first gear to drive the roller to rotate, pulling and moving the pipe to be welded on one side, making the connection between the two pipes to be welded tighter, improving the welding effect, and achieving precise centering and reliable clamping of the pipes.

[0023] 3. The second gear fixedly installed on the threaded column meshes with the second rack sliding on the second fixed block on the fixed plate, so that when the centering clamping plate moves, the threaded column can be rotated through the second rack, thereby adjusting the position of the sliding frame, and finally changing the specific position of the roller to achieve precise alignment of pipes with different diameters. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the contact plate structure in this invention; Figure 3 This is a schematic diagram of the tooling body in this invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the structure of the second rack in this invention; Figure 6 This is a schematic diagram of the structure of the first rack in this invention; Figure 7 This is a schematic diagram of the internal structure of the tooling body in this invention.

[0025] In the diagram: 1. Tooling body; 2. Long rod; 4. Annular plate; 5. Sliding plate; 6. Silicone block; 7. Contact plate; 701. Round hole; 702. Ball bearing; 8. Cable; 9. Guide tube; 901. Guide groove; 10. Placement frame; 11. Pulley; 12. Second spring telescopic rod; 121. Screw; 13. Electromagnet; 14. Fixing clamp; 15. Fixing plate; 16. Centering clamping plate; 17. Double-ended threaded rod; 18. Sliding column; 19. Push plate; 191. Connecting plate; 20. Second fixing block; 21. Second rack; 22. Sliding frame; 23. Roller; 24. Limiting column; 25. Second gear; 26. Threaded column; 27. First gear set; 28. First fixing block; 29. ​​First rack; 30. Winch; 31. Hydraulic rod; 32. Drive motor; 33. Control box; 34. Cable. Detailed Implementation

[0026] Please see Figures 1 to 7 This invention provides a pipe welding positioning fixture for ship repair and construction, the technical solution of which is as follows: A pipe welding positioning fixture for ship repair and construction includes a fixture body 1, a fixing clamp 14 mounted on the fixture body 1, a long rod 2 fixedly mounted on the fixture body 1, the long rod 2 having a hollow internal structure, multiple pulleys 11 fixedly mounted inside the long rod 2, cables 8 placed on the pulleys 11, a drive motor 32 fixedly mounted inside the fixture body 1, a winch 30 connected to the output shaft of the drive motor 32, one end of the cable 8 fixedly mounted to the winch 30, and a placement frame 10 fixedly mounted to the other end of the cable 8. Both sides of the fixture body 1 are... A sliding column 18 is fixedly installed. A through hole is opened on the tooling body 1. A double-threaded rod 17 is rotatably connected in the through hole. A fixed plate 15 is slidably connected to the sliding column 18. The double-threaded rod 17 is threadedly connected to the fixed plate 15. A centering clamping plate 16 is slidably connected to the fixed plate 15. A trumpet-shaped structure is formed between the two centering clamping plates 16. A pushing component is installed in the tooling body 1. The pushing component is connected to the centering clamping plate 16. After the placement frame 10 moves to the designated position, the pushing component pushes the centering clamping plate 16 to move.

[0027] The pushing assembly includes a hydraulic rod 31, which is fixedly mounted on a fixed plate 15. A pushing plate 19 is mounted on the movable end of the hydraulic rod 31. Connecting plates 191 are slidably connected to both sides of the pushing plate 19. The connecting plates 191 at both ends are fixedly mounted to the centering clamping plates 16 on both sides. Multiple evenly arranged sliding frames 22 are mounted on the centering clamping plates 16. Rollers 23 are fixedly mounted on the sliding frames 22. Grooves are provided on the side walls of the rollers 23 in the middle of both sides. Rubber strips are fixedly mounted in the grooves. A first gear set 27 is fixedly mounted on the rotating shaft of the rollers 23. A first fixing block 28 is fixedly mounted on the fixed plate 15. A first rack 29 that meshes with the first gear set 27 is slidably connected to the first fixing block 28.

[0028] A contact plate 7 is installed at one end of the long rod 2. A circular hole 701 is opened on the contact plate 7 for the cable 8 to pass through. Two symmetrically arranged ball bearings 702 are rolled in the circular hole 701. A guide tube 9 is fixedly installed on the placement frame 10. The cable 8 passes through the guide tube 9. Two symmetrically arranged guide grooves 901 are opened on the guide tube 9. When the cable 8 pulls the placement frame 10 to the designated position, the ball bearings 702 enter the guide grooves 901.

[0029] A ring plate 4 is fixedly installed at one end of the long rod 2. A sliding plate 5 is slidably connected to the ring plate 4. The sliding direction of the sliding plate 5 is consistent with the length direction of the long rod 2. A silicone block 6 is fixedly installed between the sliding plate 5 and the contact plate 7.

[0030] A threaded post 26 is rotatably connected to the centering clamping plate 16. The sliding frames 22 on both sides are threadedly connected to the threaded post 26. A limit post 24 is fixedly installed on the sliding frame 22. The limit post 24 is slidably connected to the centering clamping plate 16. A second gear 25 is fixedly installed on the threaded post 26. A second fixing block 20 is fixedly installed on the fixing plate 15. A second rack 21 that meshes with the second gear 25 is slidably connected to the second fixing block 20.

[0031] The groove of the pulley 11 is V-shaped. On the side of the long rod 2 away from the fixing clamp 14, the groove of the pulley 11 has multiple raised stripes, and the central axis of the multiple stripes coincides with the central axis of the pulley 11.

[0032] A cable 34 is fixedly installed on the tool body 1. One end of the cable 34 is connected to the drive motor 32 and the hydraulic rod 31. The other end of the cable 34 is fixedly installed with a control box 33. The control box 33 contains a control panel and a battery pack. The control box 33 is placed on the ground of the hull.

[0033] A second spring telescopic rod 12 is fixedly installed at the end of the long rod 2 away from the fixed clamp 14. An electromagnet 13 is fixedly installed at the movable end of the second spring telescopic rod 12. A screw 121 is threadedly connected to the fixed end of the second spring telescopic rod 12.

[0034] Working principle: When this pipe welding positioning fixture is in operation, the fixture body 1 is first installed on the pipe that has been welded on one side. The fixing clamp 14 is used to firmly clamp the fixture body 1 onto the pipe that has been installed. By adjusting the screw 121, the initial compression of the second spring telescopic rod 12 can be changed, thereby adapting to the adsorption requirements of pipes of different specifications. When the electromagnet 13 is energized, it generates a strong magnetic force, which can quickly adsorb onto the ship's steel structure, providing a stable support point for the entire positioning fixture, allowing the cable 8 to pull heavier steel pipes up for welding. When the power is off, the magnetic force disappears, facilitating the quick transfer and repositioning of the fixture in different positions. After installation, the pipe to be welded is placed on the placement frame 10. Then, the drive motor 32 is started, driving the winch 30 to rotate. Through the synergistic action of the cable 8 and the placement frame 10, the pipe to be welded is smoothly pulled to the predetermined welding position. The drive motor 32 is started through the control panel in the control box 33.

[0035] The pulley 11 has a V-shaped groove, which makes it more stable when guiding the cable 8. The V-shaped groove effectively prevents the cable 8 from slipping, while the multiple raised stripes increase the friction between the pulley 11 and the cable 8, ensuring that the cable 8 maintains a straight line during pulling and does not rotate. This ensures the stability and accuracy of the entire positioning fixture during operation. During pipe installation, after the guide tube 9 rises into the contact plate 7, the ball bearings 702 enter the guide groove 901, providing precise positioning and guidance for the contact plate 7. This prevents the placement frame 10 from shaking or shifting after it is moved into place, further ensuring the accuracy of pipe welding positioning. Simultaneously, this design makes the cable 8 pull the placement frame 10 more smoothly, reducing energy loss due to friction and other factors, and improving the operational efficiency and stability of the entire positioning fixture. Moreover, the cooperation between the guide groove 901 and the ball 702 can effectively disperse the tension borne by the cable 8 and extend the service life of the cable 8.

[0036] After the hydraulic rod 31 is activated, its movable end drives the push plate 19 to move forward. Since the connecting plate 191 is slidably connected to both sides of the push plate 19, and the connecting plate 191 is fixedly installed with the centering clamping plate 16, the movement of the push plate 19 synchronously drives the centering clamping plates 16 on both sides to move towards one side. The design of the sliding frame 22 and roller 23 on the centering clamping plate 16 allows the pipe to slide smoothly during clamping, reducing frictional resistance. In particular, the rubber strip in the groove on the side wall of the roller 23 not only increases the friction with the pipe, ensuring clamping stability, but also protects the pipe surface from damage to a certain extent. The meshing of the first gear set 27 and the first rack 29 ensures that when the centering clamping plate 16 moves towards the pipe to be welded on one side, one of the gears in the first gear set 27 rotates, and the direction of rotation is opposite to the welding direction of the centering clamping plate 16. This causes the first gear to drive the roller 23 to rotate, pulling and moving the pipe to be welded on one side, making the connection between the two pipes to be welded tighter.

[0037] Because precise positioning is often required during pipe welding, the above design incorporates a ring plate 4 fixedly mounted at one end of the long rod 2 and a sliding plate 5 slidably connected to the ring plate 4. This provides a more flexible adjustment method for the positioning fixture. When the pipes to be welded are hoisted to the designated position, there will be a certain gap at the connection between the two pipes. The rollers 23 can bring the two pipes closer together. However, at this time, the guide tube 9 has already entered the contact plate 7, preventing the pipes to be welded from moving. Therefore, the sliding plate 5 and the silicone block 6 between the sliding plate 5 and the contact plate 7 allow the sliding plate 5 to slide along the length of the long rod 2. The silicone block 6 allows the pipes to swing to a certain extent, ensuring that the central axes of the two pipes are on the same axis during welding.

[0038] Of course, alignment is a crucial step in pipe welding, especially when there is a slight deviation in the diameter of the two pipes. In the above design, the threaded post 26 rotatably connected to the alignment clamping plate 16, along with the sliding brackets 22 threadedly connected to the threaded post 26 on both sides, forms an adjustable alignment mechanism. When the threaded post 26 is rotated, the sliding brackets 22 move along the direction of the threaded post 26 due to the action of the threads. The limiting post 24 fixedly installed on the sliding bracket 22 ensures the stability of the sliding bracket 22 during movement, preventing it from deviating. Simultaneously, the second gear 25 fixedly installed on the threaded post 26 meshes with the second rack 21 sliding on the second fixing block 20 on the fixing plate 15. This allows the threaded post 26 to rotate by pushing the second rack 21, thereby adjusting the position of the sliding brackets 22 and ultimately changing the specific position of the roller 23, achieving precise alignment of the pipe.

[0039] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A pipe welding positioning fixture for ship repair and construction, characterized in that, The fixture includes a fixture body (1), on which a fixing clamp (14) is installed. A long rod (2) is fixedly installed on the fixture body (1). The long rod (2) has a hollow structure inside. Multiple pulleys (11) are fixedly installed inside the long rod (2). Cables (8) are placed on the pulleys (11). A drive motor (32) is fixedly installed inside the fixture body (1). A winch (30) is connected to the output shaft of the drive motor (32). One end of the cable (8) is fixedly installed to the winch (30). A placement frame (10) is fixedly installed on the other end of the cable (8). Both sides of the fixture body (1) are fixedly installed with... There is a sliding column (18), and a through hole is provided on the tooling body (1). A double-headed threaded rod (17) is rotatably connected in the through hole. A fixed plate (15) is slidably connected on the sliding column (18). The double-headed threaded rod (17) is threadedly connected to the fixed plate (15). A centering clamping plate (16) is slidably connected on the fixed plate (15). A trumpet-shaped structure is formed between the two centering clamping plates (16). A pushing component is installed in the tooling body (1). The pushing component is connected to the centering clamping plate (16). After the placement frame (10) moves to the designated position, the pushing component pushes the centering clamping plate (16) to move.

2. The pipe welding positioning fixture for ship repair and construction according to claim 1, characterized in that, The pushing assembly includes a hydraulic rod (31), which is fixedly mounted on a fixed plate (15). A pushing plate (19) is mounted on the movable end of the hydraulic rod (31). A connecting plate (191) is slidably connected to both sides of the pushing plate (19). The connecting plates (191) at both ends are fixedly mounted to the centering clamping plates (16) on both sides respectively. A plurality of evenly arranged sliding frames (22) are mounted on the centering clamping plates (16). Rollers (23) are fixedly mounted on the sliding frames (22). A groove is opened on the side wall of the roller (23) in the middle of both sides. A rubber strip is fixedly mounted in the groove. A first gear set (27) is fixedly mounted on the rotating shaft of the roller (23). A first fixing block (28) is fixedly mounted on the fixed plate (15). A first rack (29) that meshes with the first gear set (27) is slidably connected to the first fixing block (28).

3. A pipe welding positioning fixture for ship repair and construction according to claim 2, characterized in that, One end of the long rod (2) is equipped with a contact plate (7), and the contact plate (7) has a round hole (701) through which the cable (8) passes. Two symmetrically arranged ball bearings (702) are rolled in the round hole (701). A guide tube (9) is fixedly installed on the placement frame (10), and the cable (8) passes through the guide tube (9). Two symmetrically arranged guide grooves (901) are opened on the guide tube (9). When the cable (8) pulls the placement frame (10) to a designated position, the ball bearings (702) enter the guide grooves (901).

4. A pipe welding positioning fixture for ship repair and construction according to claim 3, characterized in that, A ring plate (4) is fixedly installed at one end of the long rod (2), and a sliding plate (5) is slidably connected on the ring plate (4). The sliding direction of the sliding plate (5) is consistent with the length direction of the long rod (2), and a silicone block (6) is fixedly installed between the sliding plate (5) and the contact plate (7).

5. A pipe welding positioning fixture for ship repair and construction according to claim 2, characterized in that, A threaded column (26) is rotatably connected to the centering clamping plate (16). The sliding frames (22) on both sides are threadedly connected to the threaded column (26). A limit post (24) is fixedly installed on the sliding frame (22). The limit post (24) is slidably connected to the centering clamping plate (16). A second gear (25) is fixedly installed on the threaded column (26). A second fixing block (20) is fixedly installed on the fixing plate (15). A second rack (21) that meshes with the second gear (25) is slidably connected to the second fixing block (20).

6. A pipe welding positioning fixture for ship repair and construction according to claim 1, characterized in that, The groove of the pulley (11) is V-shaped. On the side of the long rod (2) away from the fixing clamp (14), the groove of the pulley (11) has multiple raised stripes. The central axis of the multiple stripes coincides with the central axis of the pulley (11).

7. A pipe welding positioning fixture for ship repair and construction according to claim 2, characterized in that, A cable (34) is fixedly installed on the tool body (1). One end of the cable (34) is connected to the drive motor (32) and the hydraulic rod (31). The other end of the cable (34) is fixedly installed with a control box (33). The control box (33) contains a control panel and a battery pack. The control box (33) is placed on the ground of the ship.

8. A pipe welding positioning fixture for ship repair and construction according to claim 1, characterized in that, The long rod (2) is fixedly installed with a second spring telescopic rod (12) at the end away from the fixed clamp (14). An electromagnet (13) is fixedly installed at the movable end of the second spring telescopic rod (12). A screw (121) is threaded onto the fixed end of the second spring telescopic rod (12).

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