A welding fixture for assembling ship pipe fittings

Abstract

This invention relates to the field of pipe fitting assembly tooling technology, and discloses a welding tooling for assembling marine pipe fittings. The tooling includes a welding table with movable seats slidably connected to both sides of its upper end. Each movable seat has a bottom support assembly for placing the pipe fitting to be welded and an outer clamping assembly that engages with the bottom support assembly. An inner clamping assembly is mounted on the outer end of the bottom support assembly via a bracket assembly, and a buffer assembly is also provided on the bracket assembly. This invention, through a "self-weight triggered linkage clamping" structural design, utilizes the synergistic action of the bottom support assembly, the outer clamping assembly, and the inner clamping assembly to form an "inner support, outer clamping" positioning structure. This ensures synchronous positioning of the inner and outer walls of the pipe fitting, effectively guaranteeing the coaxiality of the pipe fitting, preventing radial displacement during welding, significantly reducing the rework rate, and improving welding quality. This invention only requires placing the pipe fitting on the support rollers, and the entire process is clamped by self-weight triggering, eliminating the need for complex manual operations.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting assembly tooling technology, specifically a welding tooling for assembling marine pipe fittings. Background Technology

[0002] In shipbuilding, piping system processing and installation account for approximately 30% of the overall construction workload. As core components of the piping system, the welding quality of ship pipe fittings directly affects the safety and stability of the ship's navigation. Welding ship pipe fittings requires extremely high standards for coaxiality and clamping stability. Traditional welding fixtures present numerous technical challenges in practical applications. Existing tooling often requires manual measurement and positioning or visual inspection for alignment, making it difficult to accurately control the coaxiality of pipe fittings. This can easily lead to weld joint misalignment and deformation, increasing rework rates and production costs. Especially for large-diameter and long pipe fittings, manual coaxiality correction is cumbersome and cannot meet high-standard welding requirements.

[0003] Some tooling uses multiple independently driven clamping mechanisms, requiring step-by-step control to fix the pipe fittings, making the clamping process cumbersome. Furthermore, it lacks an automatic reset function, requiring manual adjustment and reset after pipe fitting placement. This results in complex and inefficient operations when changing pipe fittings before and after welding using traditional tooling. To address this, we have introduced a new type of welding tooling for assembling marine pipe fittings. Summary of the Invention

[0004] The purpose of this invention is to provide a welding fixture for assembling ship pipe fittings to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A welding fixture for assembling marine pipe fittings includes a welding table, on which movable seats are movably slidably connected on both sides of the upper end of the welding table. The movable seats are provided with a bottom support assembly for placing the pipe fitting to be welded and an outer clamping assembly that engages with the bottom support assembly. The outer end of the bottom support component is equipped with an inner clamping component by a bracket assembly, and the bracket assembly is also provided with a buffer component. The pipe to be welded is placed on the bottom support assembly. Under the gravity of the pipe to be welded, the bottom support assembly moves downward, driving the outer clamping assembly to rotate and close, and then clamping it onto the outer wall of the pipe to be welded. At the same time, the outer clamping assembly rotates and closes to contact the buffer assembly, causing the buffer assembly to drive the inner clamping assembly to rotate and open, and then clamp it onto the inner wall of the pipe to be welded.

[0006] Preferably, the upper end of the welding platform is provided with a slide rail for sliding the movable seat, and an adjusting cylinder is fixed in the middle on both sides of the upper end of the welding platform, with the piston rod inside the adjusting cylinder connected to the movable seat.

[0007] Preferably, the movable seat has a reset cylinder in the center, and the bottom support assembly includes a support, a support roller at the upper end of the support, a lifting column in the center of the bottom of the support, and vertical racks fixed at the four corners of the support. The bottom of the lifting column extends into the reset cylinder and is fixed with a bottom plate. The top of the reset spring inside the reset cylinder is fixed to the lower end of the bottom plate.

[0008] Preferably, the movable seat is further provided with a vertical groove for sliding the vertical rack; The outer clamping assembly includes a rotating shaft extending through a vertical slot, two sets of gears fixed on the rotating shaft, and clamping arms fixed at both ends of the rotating shaft. The gear is located in a vertical slot and meshes with the corresponding vertical rack.

[0009] Preferably, a clamping wheel is movably mounted on the end of the clamping arm via a wheel axle, and a motor is fixed on the corresponding clamping arm. The output end of the motor is connected to a first pulley, and a second pulley is fixed after one end of the wheel axle extends out of the clamping arm. A belt connects the first pulley and the second pulley.

[0010] Preferably, the support assembly includes a horizontal plate fixed to the outer end of the bottom support assembly and a vertical abutment plate fixed to the top of the end of the horizontal plate, and a reinforcing rib is provided at the connection between the horizontal plate and the vertical abutment plate; The buffer assembly includes a buffer cylinder symmetrically fixed to a horizontal plate, a stop rod connected to the output end of the buffer cylinder, a buffer disc fixed after the stop rod extends into the buffer cylinder, and a buffer spring connected between the inside of the buffer cylinder and the buffer disc.

[0011] Preferably, the inner clamping assembly includes a drive cylinder fixed to the inner end of the vertical abutment plate, a connecting cylinder fixed to the end of the drive cylinder, an opening and closing plate movably connected to the end of the connecting cylinder by a pin, and balls movably connected to the outer side of the end of the opening and closing plate by a bowl-shaped ball seat. The drive rod at the output end of the drive cylinder extends into the cross connecting plate fixed behind the connecting cylinder, and the inner end of the opening and closing plate slides into the cross connecting plate. The buffer cylinder is connected to the drive cylinder via a conduit.

[0012] Preferably, one end of the drive rod extends into the drive cylinder and is fixed to a drive piston, and a tension spring inside the drive cylinder is fixed to the drive piston; The connecting cylinder has mounting grooves evenly spaced at its end, and a pin is used to movably connect the rotating cylinder to the mounting groove. The inner end of the opening and closing plate is fixed with a connecting arm through the rotating cylinder, and a sliding rod is fixed at the end of the connecting arm. The sliding rod slides in the sliding groove on the cross connecting plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention, through the structural design of "self-weight triggered linkage clamping", forms a "internal support and external clamping" positioning structure through the synergistic effect of the bottom support component, the outer clamping component and the inner clamping component, ensuring that the inner wall and the outer wall of the pipe are positioned synchronously, which can effectively ensure the coaxiality of the pipe, avoid radial displacement during welding, significantly reduce the rework rate and improve the welding quality.

[0014] This invention only requires placing the pipe fitting on the support roller, and the entire process of clamping is triggered by its own weight, without the need for complicated manual operation; after welding is completed, the reset spring and buffer spring automatically drive each component to reset, without manual intervention, which greatly shortens the clamping and reset time. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the invention in its initial state; Figure 2 This is an exploded structural diagram of the assembly of the movable base, bottom support component, inner clamping component and outer clamping component of the present invention. Figure 3 This is a three-dimensional structural diagram of the outer clamping component of the present invention; Figure 4 This is a three-dimensional structural diagram of the assembly of the bottom support component, the inner clamping component, and the buffer component of the present invention; Figure 5 This is a three-dimensional structural diagram of the inner clamping component in its initial state according to the present invention; Figure 6 In the initial state of this invention, Figure 2 A schematic diagram of the overall assembled three-dimensional structure; Figure 7 For the present invention Figure 6 A schematic diagram of the three-dimensional structure from another perspective; Figure 8 This is a three-dimensional structural diagram of the pipe fitting to be welded according to the present invention when it is hoisted above the bottom support assembly; Figure 9 For the present invention Figure 8 A schematic diagram of the cross-sectional structure; Figure 10 This is a three-dimensional structural diagram of the pipe fitting to be welded according to the present invention when it is completely placed on the bottom support assembly; Figure 11 For the present invention Figure 10 A schematic diagram of the cross-sectional structure; Figure 12 This is a side view of the pipe fitting to be welded after being clamped and positioned according to the present invention. Figure 13 For the present invention Figure 10 A partial sectional view of the structure; Figure 14This is a three-dimensional structural diagram of the bottom support assembly, inner clamping assembly, and outer clamping assembly after the pipe fitting to be welded is clamped and positioned according to the present invention. Figure 15 This is a three-dimensional structural diagram of the pipe fitting to be welded according to the present invention. Figure 16 This is a side view of the two sets of support rollers distributed at the front and back of the present invention to support the pipe to be welded.

[0016] In the diagram: 1. Welding table; 2. Slide rail; 3. Adjusting cylinder; 4. Moving seat; 5. Bottom support assembly; 501. Lifting column; 502. Support; 503. Support roller; 504. Vertical rack; 505. Bottom plate; 506. Return spring; 6. Inner clamping assembly; 601. Drive cylinder; 603. Connecting cylinder; 604. Opening / closing plate; 605. Ball bearing; 606. Drive rod; 607. Drive piston; 608. Tension spring; 609. Cross connecting plate; 610. Slide groove; 611. Slide rod; 612. Connecting arm; 6 13. Rotary drum; 614. Pin; 615. Bowl-shaped ball bearing seat; 7. Outer clamping assembly; 701. Rotary shaft; 702. Gear; 703. Clamping arm; 704. Clamping wheel; 705. Motor; 706. First pulley; 707. Belt; 708. Second pulley; 8. Piston rod; 9. Reset cylinder; 10. Vertical groove; 11. Buffer cylinder; 12. Abutment rod; 13. Horizontal plate; 14. Reinforcing rib; 15. Vertical abutment plate; 16. Guide tube; 17. Pipe fitting to be welded; 18. Buffer disc; 19. Buffer spring. 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] Example: Please see Figures 1-16 The present invention provides a technical solution: A welding fixture for assembling marine pipe fittings includes a welding table 1. Movable seats 4 are slidably connected to both sides of the upper end of the welding table 1. A slide rail 2 for sliding the movable seats 4 is provided on the upper end of the welding table 1. An adjusting cylinder 3 is centrally fixed on both sides of the upper end of the welding table 1. A piston rod 8 inside the adjusting cylinder 3 is connected to the movable seat 4. The adjusting cylinder 3 is a hydraulic cylinder, electric cylinder, or pneumatic cylinder of the appropriate type. The movable seat 4 is provided with a bottom support assembly 5 for placing the pipe fitting 17 to be welded, and an outer clamping assembly 7 that engages with the bottom support assembly 5. A reset cylinder 9 is centrally located inside the movable seat 4. The bottom support assembly 5 includes a support 502, a support roller 503 at the upper end of the support 502, a lifting column 501 centrally located at the bottom of the support 502, and vertical racks 504 fixed at the four corners of the support 502. The bottom of the lifting column 501 extends into the reset cylinder 9 and is fixed to a bottom plate 505. The top of a reset spring 506 inside the reset cylinder 9 is fixed to the lower end of the bottom plate 505.

[0019] After the welded pipe fitting 17 is lifted off, the return spring 506 can automatically push the bottom support component 5 and the outer clamping component 7 to reset, without manual operation, thus improving clamping efficiency.

[0020] The support rollers 503 at the upper end of the support 502 can be arranged in two groups, left and right (e.g.) Figure 6 , Figure 12 , Figure 13 As shown), it can support the pipe fitting 17 to be welded, facilitating the hoisting and placement of the pipe fitting 17. The support rollers 503 can also be arranged in two sets, front and rear (e.g. Figure 16 As shown in the figure, the support roller 503 is arranged parallel to the axis of the pipe to be welded 17. The bottom of the pipe to be welded 17 can be placed on top between the front and rear sets of support rollers 503. In this way, when the pipe to be welded 17 is rotated for welding, the support roller 503 can rotate synchronously with the pipe to be welded 17, reducing frictional resistance.

[0021] The movable seat 4 is also provided with a vertical groove 10 for sliding the vertical rack 504. The outer clamping assembly 7 includes a rotating shaft 701 extending through the vertical groove 10, two sets of gears 702 fixed on the rotating shaft 701, and clamping arms 703 fixed at both ends of the rotating shaft 701. The gears 702 are located in the vertical groove 10 and mesh with the corresponding vertical rack 504.

[0022] The gear and rack transmission is precise and the clamping action is smooth: the meshing transmission gap between the gear and rack is small, which can ensure that the rotation angle of the clamping arm 703 is precise and controllable, and avoid the pipe from shaking during the clamping process.

[0023] A clamping wheel 704 is movably mounted on the end of the clamping arm 703 via a wheel axle. A motor 705 is also fixed on the corresponding clamping arm 703. The output end of the motor 705 is connected to a first pulley 706. One end of the wheel axle extends out of the clamping arm 703 and is fixed to a second pulley 708. A belt 707 connects the first pulley 706 and the second pulley 708.

[0024] Integrated rotary drive function enables continuous welding: the clamping wheel 704 is driven to rotate by the motor 705, which can drive the pipe to be welded 17 to rotate synchronously, so that circumferential welding can be completed without manual flipping, thus improving welding efficiency.

[0025] The clamping wheel 704 makes contact, reducing surface damage to the pipe fitting 17 to be welded: The clamping wheel 704 makes rolling contact with the outer wall of the pipe fitting 17 to be welded. Compared with rigid clamping blocks, this can reduce scratches and extrusion deformation on the surface of the pipe fitting, and protect the appearance quality of the pipe fitting.

[0026] The outer end of the bottom support component 5 is equipped with an inner clamping component 6 by a bracket assembly. The bracket assembly is also equipped with a buffer component. The bracket assembly includes a horizontal plate 13 fixed to the outer end of the bottom support component 5 and a vertical abutment plate 15 fixed to the top of the end of the horizontal plate 13. A reinforcing rib 14 is provided at the connection between the horizontal plate 13 and the vertical abutment plate 15. The buffer component includes a buffer cylinder 11 symmetrically fixed to the horizontal plate 13, an abutment rod 12 connected to the output end of the buffer cylinder 11, a buffer disc 18 fixed after the abutment rod 12 extends into the buffer cylinder 11, and a buffer spring 19 connected between the inside of the buffer cylinder 11 and the buffer disc 18.

[0027] The inner clamping assembly 6 includes a drive cylinder 601 fixed to the inner end of the vertical abutment plate 15, a connecting cylinder 603 fixed to the end of the drive cylinder 601, an opening and closing plate 604 movably connected to the end of the connecting cylinder 603 by a pin 614, and a ball 605 movably connected to the outer side of the end of the opening and closing plate 604 by a bowl-shaped ball seat 615. The drive rod 606 at the output end of the drive cylinder 601 extends into the connecting cylinder 603 and is fixed to a cross connecting plate 609, and the inner end of the opening and closing plate 604 slides on the cross connecting plate 609. The buffer cylinder 11 is connected to the drive cylinder 601 by a conduit 16.

[0028] One end of the drive rod 606 extends into the drive cylinder 601 and is fixed to the drive piston 607. The tension spring 608 inside the drive cylinder 601 is fixed to the drive piston 607. The end of the connecting cylinder 603 has mounting grooves distributed at equal intervals, and the pin 614 is used to movably connect the rotating cylinder 613 to the mounting groove. The inner end of the opening and closing plate 604 is fixed to the connecting arm 612 through the rotating cylinder 613. The end of the connecting arm 612 is fixed to the slide rod 611, which slides in the slide groove 610 on the cross connecting plate 609.

[0029] The diameter of the connecting sleeve 603 is smaller than the inner diameter of the pipe fitting 17 to be welded, in such cases... Figure 6 and Figure 7 In the initial state shown, the opening and closing plate 604 is closed so that the pipe fitting 17 to be welded can be hoisted and the inner clamping assembly 6 can be smoothly inserted into the pipe fitting 17 to be welded.

[0030] The hydraulic linkage between the buffer cylinder 11 and the drive cylinder 601 enables the smooth transmission of force, so that the opening force of the opening and closing plate 604 is evenly distributed on the inner wall of the pipe to be welded 17, avoiding excessive local stress that could cause the pipe to deform.

[0031] The buffer spring 19 can buffer the squeezing impact of the clamping arm 703 on the abutment rod 12, avoid the wear or damage of structural components caused by rigid collision, and extend the service life of the equipment.

[0032] The ball bearing 605 at the end of the opening and closing plate 604 makes rolling contact with the inner wall of the pipe fitting 17 to be welded, which not only ensures the stability of the support, but also reduces the frictional resistance when the pipe fitting 17 is rotated for welding.

[0033] The pipe fitting 17 to be welded is placed on the bottom support assembly 5. Under the gravity of the pipe fitting 17 to be welded, the bottom support assembly 5 moves downward, driving the outer clamping assembly 7 to rotate and close, and then clamping it on the outer wall of the pipe fitting 17 to be welded. At the same time, the outer clamping assembly 7 rotates and closes to contact the buffer assembly, causing the buffer assembly to drive the inner clamping assembly 6 to rotate and open, and then clamp it on the inner wall of the pipe fitting 17 to be welded.

[0034] The "external clamping and internal support" linkage clamping action can be triggered solely by the weight of the pipe fitting 17 to be welded, eliminating the need for a complex electrical control system and reducing equipment costs and failure rates.

[0035] The clamping force is positively correlated with the weight of the pipe fitting 17 to be welded. The larger the pipe diameter and the heavier the weight, the stronger the clamping force. At the same time, the opening angle of the opening and closing plate 604 can be adaptively adjusted according to the change of pipe diameter, which can be adapted to clamping various specifications of ship pipe fittings.

[0036] The coordinated use of internal support and external clamping ensures clamping stability: the external clamping and internal support are carried out simultaneously, which can effectively prevent radial displacement or deformation during pipe welding, ensure the coaxiality of the welding interface, and improve welding quality.

[0037] Specifically, when using it: This fixture is used for rapid clamping and positioning of marine pipe fittings before welding. Its core mechanism utilizes the weight of the pipe fitting 17 to trigger the coordinated action of the bottom support assembly 5, the outer clamping assembly 7, and the inner clamping assembly 6, achieving synchronous self-adaptive clamping between the outer and inner walls of the pipe fitting. This ensures the coaxiality and stability of the pipe fitting during welding. The specific workflow is as follows: The pipe to be welded 17 is hoisted above the bottom support assembly 5, and the inner clamping assembly 6 is inserted into the pipe to be welded 17. Then the pipe to be welded 17 is placed on the upper end of the support roller 503 of the bottom support assembly 5 on the movable seat 4.

[0038] Under the gravity of the pipe fitting 17 to be welded, the support 502 drives the lifting column 501 to move downward, compressing the reset spring 506 inside the reset cylinder 9, causing the bottom plate 505 at the bottom of the support 502 to move downward along the inner wall of the reset cylinder 9; at the same time, the vertical racks 504 at the four corners of the support 502 slide downward synchronously along the vertical grooves 10 on the moving seat 4.

[0039] When the outer clamping assembly 7 closes in conjunction with the outside, it clamps the outer wall of the pipe fitting 17 to be welded. When the vertical rack 504 moves downward, it meshes with the gear 702 of the outer clamping assembly 7, driving the rotating shaft 701 to rotate along the through-hole of the vertical groove 10. The rotating shaft 701 drives the clamping arms 703 at both ends to rotate upward and close, until the clamping wheel 704 at the end of the clamping arm 703 abuts against the outer wall of the pipe fitting 17 to be welded, thus completing the initial clamping of the outer wall of the pipe fitting 17 to be welded.

[0040] When the buffer assembly is triggered, it drives the inner clamping assembly 6 to open and clamp the inner wall of the pipe fitting 17 to be welded. During the upward rotation and closing process of the clamping arm 703, its side wall contacts and squeezes the abutment rod 12 of the buffer assembly, causing the abutment rod 12 to move into the buffer cylinder 11, pushing the buffer disc 18 to compress the buffer spring 19.

[0041] The fluid inside the buffer cylinder 11 is transported through the conduit 16 to the drive cylinder 601 of the inner clamping assembly 6, which pushes the drive piston 607 to stretch the tension spring 608 and drive the drive rod 606 to extend outward.

[0042] The cross connecting plate 609 at the end of the drive rod 606 moves outward, and the slide rod 611 at the end of the connecting arm 612 slides along the slide groove 610 on the cross connecting plate 609, driving the opening and closing plate 604 to rotate outward around the pin 614 and open.

[0043] When the ball bearing 605 at the end of the opening and closing plate 604 abuts against the inner wall of the pipe fitting 17 to be welded, the inner wall of the pipe fitting 17 to be welded is clamped. At this time, the bottom support component 5, the outer clamping component 7, and the inner clamping component 6 form a clamping structure of "inner support and outer clamping" to ensure the coaxiality of the pipe fitting.

[0044] The adjusting cylinders 3 on both sides of the welding table 1 are activated. The piston rod 8 extends and retracts, causing the moving seat 4 to slide along the slide rail 2. The distance between the two sets of moving seats 4 is adjusted to adapt to the clamping requirements of ship pipe fittings of different lengths, thereby adjusting the weld spacing between the pipe fittings 17 to be welded. During the welding process, the motor 705 can be activated. Through the transmission of the first pulley 706, belt 707, and second pulley 708, the clamping wheel 704 is driven to rotate, thereby driving the pipe fittings 17 to be welded to rotate, so as to realize the continuous circumferential welding of the pipe fittings 17 to be welded.

[0045] When the pipe fitting 17 to be welded rotates, the part of the ball 605 protruding from the bowl-shaped ball seat 615 abuts against the inner wall of the pipe fitting 17 to be welded. Under the action of friction, the ball 605 can rotate in the bowl-shaped ball seat 615 at the end of the opening and closing plate 604. This can satisfy the need to clamp the inner wall of the pipe fitting 17 to be welded while also satisfying the need to rotate the pipe fitting 17 to be welded.

[0046] After welding is completed, the pipe fitting 17 to be welded is lifted off the support roller 503. The elastic restoring force of the return spring 506 pushes the bottom plate 505 to move upward, which drives the vertical rack 504 to slide upward. Through the gear and rack meshing transmission, the clamping arm 703 opens outward and resets. At the same time, the buffer spring 19 pushes the buffer plate 18 to reset, and the tension spring 608 in the drive cylinder 601 pulls the drive piston 607 to reset, so that the opening and closing plate 604 retracts inward, waiting for the clamping of the next set of pipe fittings.

[0047] 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 marine pipe fitting assembly welding fixture comprising a welding table, characterised in that: The upper end of the welding platform is movably slidably connected to two movable seats on both sides. The movable seats are provided with a bottom support assembly for placing the pipe fitting to be welded and an outer clamping assembly that engages with the bottom support assembly. The outer end of the bottom support component is equipped with an inner clamping component by a bracket assembly, and the bracket assembly is also provided with a buffer component; The pipe fitting to be welded is placed on the bottom support assembly. Under the gravity of the pipe fitting, the bottom support assembly moves downward, driving the outer clamping assembly to rotate and close, and then clamping it onto the outer wall of the pipe fitting. At the same time, the outer clamping assembly rotates and closes, contacting the buffer assembly, which drives the inner clamping assembly to rotate and open, and then clamps it onto the inner wall of the pipe fitting. The movable seat has a reset cylinder in the center, and the bottom support assembly includes a support, a support roller at the upper end of the support, a lifting column at the center of the bottom of the support, and vertical racks fixed at the four corners of the support. The bottom of the lifting column extends into the reset cylinder and is fixed with a bottom plate. The top of the reset spring inside the reset cylinder is fixed to the lower end of the bottom plate. The movable seat is also provided with a vertical groove for sliding the vertical rack; The outer clamping assembly includes a rotating shaft extending through a vertical slot, two sets of gears fixed on the rotating shaft, and clamping arms fixed at both ends of the rotating shaft. The gear is located in a vertical slot and meshes with the corresponding vertical rack. The support assembly includes a horizontal plate fixed to the outer end of the bottom support assembly and a vertical abutment plate fixed to the top of the end of the horizontal plate. The connection between the horizontal plate and the vertical abutment plate is provided with reinforcing ribs. The buffer assembly includes a buffer cylinder symmetrically fixed to a horizontal plate, a stop rod connected to the output end of the buffer cylinder, a buffer plate fixed after the stop rod extends into the buffer cylinder, and a buffer spring connected between the inside of the buffer cylinder and the buffer plate. The inner clamping assembly includes a drive cylinder fixed to the inner end of the vertical abutment plate, a connecting cylinder fixed to the end of the drive cylinder, an opening and closing plate movably connected to the end of the connecting cylinder by a pin, and balls movably connected to the outer side of the end of the opening and closing plate by a bowl-shaped ball seat. The drive rod at the output end of the drive cylinder extends into the cross connecting plate fixed behind the connecting cylinder, and the inner end of the opening and closing plate slides into the cross connecting plate. The buffer cylinder is connected to the drive cylinder via a conduit.

2. The welding fixture for assembling ship pipe fittings according to claim 1, characterized in that: The upper end of the welding platform is provided with a slide rail for sliding the movable seat. Adjustment cylinders are fixed in the middle on both sides of the upper end of the welding platform, and the piston rod inside the adjustment cylinder is connected to the movable seat.

3. The welding fixture for assembling marine pipe fittings according to claim 1, characterized in that: The clamping arm has a clamping wheel movably mounted on its end via an axle. A motor is also fixed on the corresponding clamping arm. The output end of the motor is connected to a first pulley. One end of the axle extends out of the clamping arm and is fixed to a second pulley. A belt connects the first pulley and the second pulley.

4. The welding fixture for assembling ship pipe fittings according to claim 1, characterized in that: One end of the drive rod extends into the drive cylinder and is fixed to the drive piston. The tension spring inside the drive cylinder is fixed to the drive piston. The connecting cylinder has mounting grooves evenly spaced at its end, and a pin is used to movably connect the rotating cylinder to the mounting groove. The inner end of the opening and closing plate is fixed with a connecting arm through the rotating cylinder, and a sliding rod is fixed at the end of the connecting arm. The sliding rod slides in the sliding groove on the cross connecting plate.

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