Pipe joint welding apparatus

Abstract

The application belongs to the technical field of underwater welding and specifically discloses a pipeline joint welding device, which comprises a base, a welding assembly is fixedly connected to the top end of the base, an anti-vortex cover is arranged on the outer side of the welding assembly, an air inlet pipe is arranged on the side wall of the anti-vortex cover, a first waterproof motor is drivingly connected to the top end of the welding assembly, a clamping seat is arranged on one side of the first waterproof motor, clamping assemblies are arranged on one side of the base and the clamping seat. The two-stage clamping assembly can meet the requirements of pipeline cleaning and welding fixation, the pipeline cleaning assembly is used to clean the adhering matters on the pipeline wall in advance, the dry welding environment is constructed by using the anti-vortex cover and the inflation sealing structure, the precise welding is realized by using the surrounding welding assembly, the problems of large water flow interference, unstable clamping, sealing failure and poor welding quality in underwater welding are solved, and the efficient and stable welding operation of the underwater pipeline joint is realized.

Description

Technical Field

[0001] This invention belongs to the field of underwater welding technology, specifically a pipe joint welding device. Background Technology

[0002] Patent application number CN202510831412.8 discloses an underwater welding robot, including two clamping mechanisms spaced apart; an adjusting mechanism for adjusting the distance between the two adjusting mechanisms; a water-blocking mechanism for moving an annular water-blocking cavity to the welding position to reduce the impact of water flow on the welding equipment; and a vision controller. The underwater welding robot provided by this invention features two clamping mechanisms, one of which can clamp onto the pipe to be connected and be transported underwater with the pipe, while the other clamps onto the underwater pipe after being transported underwater. The adjusting mechanism allows for adjustment of the distance between the two clamping mechanisms. The water-blocking mechanism moves the annular water-blocking cavity to the welding position to reduce the impact of water flow on the welding equipment. The vision controller can determine the pipe connection position underwater. The water-blocking mechanism avoids the impact of water flow on the welding process, resulting in high welding precision, good adaptability, and good practicality.

[0003] The prior art, including the aforementioned patents, has the following defects: Firstly, existing welding equipment is prone to swaying and welding torch deviation when welding in seawater due to eddy current impact, affecting welding quality. The aforementioned patent only relies on the splicing of semi-circular water-blocking rings to form a water-blocking cavity, without a sealing and water-stopping design. High-velocity and high-pressure seawater can easily seep in from the splicing points and the gaps between pipe fittings, failing to isolate the water flow from the interference of the molten pool and electric arc, resulting in poor water-blocking effect. Furthermore, the water-blocking mechanism relies only on spring positioning without a locking and fixing structure, making it easily displaced by the impact of water flow and unable to stably maintain the welding protection position. Secondly, the clamping mechanism of this patent is a rigid structure, which only relies on the end of the telescopic rod to abut against the pipe at a single point, without a flexible adaptive fitting structure; when the outer wall of the pipe is corroded or deformed and becomes uneven, clamping gaps are easily formed, making it impossible to lock tightly in the full circumference; water flow impact can easily cause the pipe to shake and shift, and vibration transmission can cause equipment resonance, resulting in inaccurate positioning of the welding torch, deviation of the welding trajectory, poor weld formation quality, and inability to provide a stable working environment for welding; Third, existing welding equipment is usually not equipped with a pre-cleaning mechanism for pipe surfaces, and often directly welds pipes with marine organisms, calcification layers, rust and other impurities attached to them. The uneven attachments will damage the seal and form gaps that allow seawater to seep in, damaging the dry welding environment, causing weld defects, and reducing the welding strength and corrosion resistance of the joint. In addition, the attachments are easy to fall off and form debris, which enters the molten pool and causes slag inclusions in the weld, further reducing the welding quality and even causing the joint to fail, thus failing to meet the long-term safe use requirements of the pipeline. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe joint welding device that effectively improves the ease of operation, welding accuracy and weld formation quality of underwater pipe joint welding operations, reduces labor intensity, and ensures the structural strength, corrosion resistance and long-term reliability of the welded joint.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A pipe joint welding device includes a base, a welding assembly fixedly connected to the top of the base, an anti-vortex shroud fitted on the outer side of the welding assembly, an air inlet pipe on the side wall of the anti-vortex shroud, a first waterproof motor drivenly connected to the top of the welding assembly, a clamping seat on one side of the first waterproof motor, clamping assemblies on one side of both the base and the clamping seat, and a second waterproof motor on the base, the power end of the second waterproof motor being drivenly connected to a pipe cleaning assembly.

[0006] Specifically, the welding assembly includes a fixing plate, an annular seat at the top of the fixing plate, a toothed ring rotatably connected to the outer side of the annular seat, a retractable welding gun holder on the toothed ring, and a welding gun inside the retractable welding gun holder; multiple gears are meshed at the other end of the toothed ring, one end of the gears being connected to the power output end of the first waterproof motor; a support cylinder is provided at the bottom of the fixing plate, and the bottom end of the support cylinder is installed at the top of the base; a wire sealing sleeve is provided on the side wall of the support cylinder.

[0007] Specifically, two anti-vortex covers are provided, and the two anti-vortex covers are symmetrically hinged on the base. The top and bottom ends of the anti-vortex covers are provided with pipe clamp interfaces and motor shaft clamp interfaces. An expansion chamber is provided on the inner side wall of the pipe clamp interface. A fluororubber ring is connected to the inner cavity of the expansion chamber. A gas connecting pipe is provided at one end of the fluororubber ring, and a gas distributor is connected at the other end of the gas connecting pipe. An annular groove is provided on the inner side wall of the motor shaft clamp interface, and an air-sealing rubber ring is provided in the inner cavity of the annular groove.

[0008] Specifically, one end of the air intake pipe is connected to the gas distributor, which is connected to the inner cavity of the anti-vortex shroud. The gas distributor has an air inlet and a drain outlet on one side, both located within the inner cavity of the anti-vortex shroud. Both the air inlet and the drain outlet have filters installed in their inner cavities. The top of the gas distributor is equipped with a one-way constant pressure relief valve that communicates with the inner top wall of the anti-vortex shroud. The outer wall of the gas distributor is equipped with a one-way constant pressure drain valve that communicates with the inner wall of the drain outlet.

[0009] Specifically, one end of the first waterproof motor is provided with a fixed seat, one end of the fixed seat is connected to the clamping seat, and the other end of the fixed seat is connected to the base. The inner cavities of the fixed seat, the clamping seat and the base are all provided with inner wiring grooves that communicate with the inner cavity of the underwater pipeline harness anti-twist protection tube. Multiple handrails are provided on the side wall of the fixed seat.

[0010] Specifically, an underwater pipeline harness anti-twist protection tube is inserted into the top of the clamping seat, a gas valve is provided on the side wall of the clamping seat, and the underwater pipeline harness anti-twist protection tube is sleeved on the outside of one end of the two air inlet pipes.

[0011] Specifically, the clamping assembly includes a primary gripper mounted on the base and the clamping seat. The inner wall of the primary gripper is provided with an anti-slip groove. The other end of the primary gripper is hinged to a secondary gripper. Multiple rollable steel balls are rotatably connected to the inner side wall of the secondary gripper. The secondary gripper is provided with a hydraulic telescopic rod. The other end of the hydraulic telescopic rod is mounted on the side wall of the primary gripper.

[0012] Specifically, the pipe cleaning assembly includes a rotating track hinged to the bottom of the base. A slip ring is slidably connected to the inner cavity of the rotating track. Multiple elastic telescopic rods are arranged in an array on the slip ring. Springs are fitted on the outer sides of each elastic telescopic rod. The multiple elastic telescopic rods are connected to a drive ring located in the inner cavity of the slip ring. A toothed groove is formed on the inner side wall of the drive ring to mesh with the gear at the power output end of the second waterproof motor. A scraper is provided at the other end of each elastic telescopic rod. One end of the rotating track and the drive ring are provided with a snap-fit ​​component and a snap-fit ​​groove that mates with the snap-fit ​​component. A rectangular cut is formed at one end of the rotating track. A telescopic positioning clip that mates with the rectangular cut and an unlocking button that abuts against the telescopic positioning clip are also provided on the side wall of the rotating track.

[0013] Specifically, the outer wall of the anti-vortex cover is provided with multiple anti-arc light tempered glass windows.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes an integrated design of a closable anti-vortex cover combined with an inflatable flexible seal and graded gas diversion control. First, a gas distributor delivers argon gas to the fluororubber ring and the gas-sealing ring. Inflation and expansion achieve adaptive flexible sealing at the pipe joint and motor shaft connection, sealing all gaps and blocking the infiltration path of external seawater and vortices from the source. Then, by continuously filling the anti-vortex cover cavity with argon gas, the increased internal pressure completely drains the seawater through a one-way constant pressure drain valve. This, combined with a one-way constant pressure relief valve, maintains a slightly positive pressure environment within the cavity that is higher than the external water pressure. Compared to the simple water-blocking structure of traditional semi-annular water-blocking rings, this invention solves the problems of poor water-blocking effect, easy water infiltration interfering with welding, and inability to isolate vortex impacts in existing technologies. It also avoids the problems of easy oxidation of the molten pool and easy porosity cracks in the weld seam during wet welding. Simultaneously, the flexible seal can adaptively fill slight deformation and depressions on the outer wall of the pipe and block the transmission of pipe vibrations, creating a stable dry welding gas phase environment and improving the welding quality, structural strength, and corrosion resistance of underwater pipe joints.

[0015] 2. This invention utilizes a two-stage clamping structure combining a primary rigid fixed gripper and a secondary sliding auxiliary gripper, coupled with the drive control of a hydraulic telescopic rod, to achieve graded adaptation of a single clamping mechanism to the entire pipeline cleaning and welding fixing process. During the pipeline surface cleaning stage, the rolling steel balls on the inner side of the secondary gripper form a low-resistance sliding clamp that conforms to the outer wall of the pipeline. This ensures the coaxiality of the equipment and the pipeline, preventing scraper deviation and blind spots during cleaning, while also allowing the equipment to slide up and down along the pipeline axis, achieving full-range cleaning in conjunction with the pipeline cleaning components. During welding operations… In this stage, the equipment and the two sections of pipe to be welded are rigidly locked in the entire circumference through the primary clamping jaws. The anti-slip grooves on the inner wall increase the friction of the clamping, effectively resisting the shaking of the equipment and displacement of the pipe caused by the impact of the underwater water flow. Compared with the traditional single rigid clamping structure, it not only solves the problem of the existing technology having a single clamping function and being unable to take into account the mobility of the cleaning stage and the fixed stability of the welding stage, but also avoids the defects of resonance caused by pipe vibration transmission and welding torch trajectory deviation. It takes into account the adaptability of the equipment to the working conditions and the stability of operation, and provides a precise and reliable clamping foundation for cleaning and welding operations.

[0016] 3. This invention utilizes an integrated, openable, circumferential pipe cleaning component structure. A second waterproof motor drives a toothed drive ring to rotate circumferentially along a rotating track. This, combined with a spring-loaded, self-adaptive elastic telescopic rod, causes a scraper to adhere to the outer wall of the pipe, achieving 360° circumferential cleaning of the pipe surface. Simultaneously, the axial movement of the equipment enables full-range cleaning of the welded sealing area. Compared to existing underwater welding equipment that lacks a pre-cleaning mechanism and directly welds pipes with attached deposits, this invention solves the problems of poor sealing and seawater infiltration caused by marine organisms, calcification, and rust on the outer wall of the pipe. It also avoids the defects of deposits detaching and forming debris that enters the molten pool, causing slag inclusions and weld joint failure. No additional cleaning equipment is required, simplifying the underwater welding process, ensuring the reliability of subsequent sealing and welding quality, and improving the practicality and efficiency of the equipment.

[0017] 4. This invention utilizes a ring-shaped welding assembly structure with a first waterproof motor and gear / gear ring transmission. The first waterproof motor drives the gear to rotate the gear ring precisely around the annular seat, which in turn drives the welding torch to perform 360° full-circumferential welding along the pipe butt weld seam via a retractable welding torch holder. The retractable welding torch holder can flexibly adjust the extension length and welding angle of the welding torch, ensuring that the distance between the welding torch and the weld seam remains stable throughout the welding process. Compared with traditional fixed welding structures, this invention solves the problems of easy deviation of the welding torch's circumferential trajectory and poor weld seam consistency in underwater welding. It can also flexibly adapt to the welding process requirements of pipes with different diameters and wall thicknesses. The welding speed and welding torch position are adjustable and controllable, improving the positioning accuracy, work efficiency, and weld seam quality of underwater welding.

[0018] 5. This invention integrates an underwater lifting drive unit, an integrated internal wiring trough and underwater pipeline harness anti-twist protection tube, and an anti-arc light tempered glass viewing window. The turbofan rotation of the underwater lifting drive unit provides auxiliary buoyancy and directional thrust, reducing workload and enabling flexible attitude adjustment and axial movement of the equipment. The integrated internal wiring and anti-twist protection tube provide integrated sealing protection for electrical wires and gas pipelines, preventing underwater pipeline entanglement and water ingress damage. The anti-arc light tempered glass viewing window isolates the strong welding arc light from injuring workers' eyes while allowing workers to observe the welding status from multiple angles in real time. Compared to traditional underwater welding equipment, this invention solves the problems of high operational difficulty, easily damaged pipelines, and poor welding observation safety in underwater operations, while also improving the equipment's operational flexibility, on-site adaptability, and operational safety, ensuring the long-term reliability of the equipment in complex underwater environments.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the intake pipe structure of the present invention; Figure 4 This is a schematic diagram of the fluororubber ring and gas-sealing ring of the present invention; Figure 5 This is a schematic diagram of the gas splitter structure of the present invention; Figure 6 This is a schematic diagram of the internal wiring groove structure of the present invention; Figure 7 yes Figure 6 Enlarged structural diagram at point A; Figure 8 This is a schematic diagram of the slip ring structure of the present invention; Figure 9 This is a schematic cross-sectional view of the rotating track structure of the present invention; Figure 10 This is a schematic diagram of the connection structure between the annular seat and the toothed ring of the present invention; Figure 11 This is a schematic diagram of the telescopic positioning card structure of the present invention.

[0022] In the diagram: 1. Base; 2. Welding assembly; 21. Fixing plate; 22. Annular seat; 23. Gear ring; 24. Support cylinder; 25. Wire sealing sleeve; 3. Anti-vortex cover; 31. Pipe clamp interface; 32. Motor shaft clamp interface; 33. Expansion chamber; 34. Fluororubber ring; 35. Gas distributor; 351. Air inlet; 352. Drain outlet; 354. One-way constant pressure relief valve; 355. One-way constant pressure drain valve; 36. Air seal ring; 4. Air inlet pipe; 5. First waterproof 6. Motor; 7. Clamping seat; 8. Clamping assembly; 9. Primary gripper; 10. Secondary gripper; 11. Hydraulic telescopic rod; 12. Second waterproof motor; 13. Pipe cleaning assembly; 14. Rotary track; 15. Slip ring; 16. Elastic telescopic rod; 17. Drive ring; 18. Scraper; 19. Snap-fit ​​component; 20. Snap-fit ​​groove; 21. Telescopic positioning clip; 22. Fixed seat; 33. Internal wiring channel; 44. Handrail; 55. Underwater pipeline harness anti-twist protection tube; 66. Gas valve. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0024] like Figures 1-11 As shown, a pipe joint welding device includes a base 1, a welding assembly 2 fixedly connected to the top of the base 1, an anti-vortex cover 3 sleeved on the outside of the welding assembly 2, an air inlet pipe 4 provided on the side wall of the anti-vortex cover 3, a first waterproof motor 5 drivenly connected to the top of the welding assembly 2, and a clamping seat 6 provided on one side of the first waterproof motor 5; clamping assemblies 7 are provided on one side of both the base 1 and the clamping seat 6, and the two sets of clamping assemblies 7 realize the graded clamping and fixing of the device and the pipe to be welded, taking into account both the sliding guidance during the pipe cleaning stage and the rigid locking during the welding stage; a second waterproof motor 8 is also provided on the base 1, and the power end of the second waterproof motor 8 is drivenly connected to the pipe cleaning assembly 9, which can perform pre-cleaning of the adhering materials on the outer wall of the pipe before welding, avoiding the problems of subsequent sealing failure and weld slag inclusion caused by the unevenness of the pipe surface from the source.

[0025] In this embodiment, the welding assembly 2 includes a fixing plate 21, an annular seat 22 at the top of the fixing plate 21, a gear ring 23 rotatably connected to the outer side of the annular seat 22, a retractable welding torch holder on the gear ring 23, and a welding torch clamped inside the retractable welding torch holder; multiple gears are meshed on the outer side of the gear ring 23, one end of which is connected to the power output end of the first waterproof motor 5. Driven by the first waterproof motor 5, the gear ring 23 can be rotated 360° around the annular seat 22, thereby driving the welding torch to perform a full circumference of the pipe butt weld. Welding ensures the welding torch travels precisely and stably along the weld seam, guaranteeing consistent weld formation. A support cylinder 24 is installed at the bottom of the fixing plate 21, with its bottom end mounted on the top of the base 1, providing stable installation support for the welding assembly 2 and preventing structural shaking during welding. A wire sealing sleeve 25 is installed on the side wall of the support cylinder 24, allowing the power supply and control cables of the welding torch to pass through the wire sealing sleeve 25 into the inner wiring groove 11, achieving cable sealing protection, preventing seawater infiltration and short circuit faults, and ensuring electrical safety during underwater operations.

[0026] In this embodiment, two anti-vortex covers 3 are provided. The two anti-vortex covers 3 are symmetrically hinged on the base 1, which can realize quick opening and closing operation. After closing, they can completely cover the welding component 2 and the welding operation area, isolate the impact of external seawater vortex on the welding arc and molten pool, and avoid welding defects caused by water flow interference. The top and bottom ends of the anti-vortex cover 3 are provided with pipe clamp interface 31 and motor shaft clamp interface 32. The pipe clamp interface 31 is used for the pipe to be welded to pass through, and the motor shaft clamp interface 32 is used to adapt the drive shaft of the support cylinder 24 and the first waterproof motor 5 to pass through, ensuring the structural adaptability of the anti-vortex cover 3 after closing.

[0027] In this embodiment, an expansion chamber 33 is provided on the inner wall of the pipe clamp interface 31. A fluororubber ring 34 is connected to the inner cavity of the expansion chamber 33. A gas connecting pipe is provided at one end of the fluororubber ring 34, and a gas distributor 35 is connected to the other end of the gas connecting pipe. Inert gas can be injected into the fluororubber ring 34 through the gas distributor 35, so that after inflation and expansion, it adaptively fits the outer wall of the pipe, completely sealing the annular gap between the pipe clamp interface 31 and the pipe. Even if there are slight deformations or unevenness on the outer wall of the pipe, the gap can be filled by flexible expansion, solving the water leakage problem of rigid sealing. At the same time, the expanded fluororubber ring 34 can form a buffer and vibration isolation layer, blocking the vibration generated by the water flow impact on the pipe from being transmitted to the anti-vortex cover 3 and welding assembly 2, further improving the stability of the welding process.

[0028] In this embodiment, an annular groove is provided on the inner side wall of the motor shaft clamping interface 32, and an air-sealing ring 36 is provided in the inner cavity of the annular groove. After being inflated, it can tightly fit the outer wall of the shaft body, realize the full circumference sealing of the dynamic and static mating parts, prevent seawater from seeping into the anti-vortex cover 3 from the shaft body mating gap, and ensure the stability of the dry welding environment.

[0029] In this embodiment, one end of the air inlet pipe 4 is connected to the gas distributor 35. The gas distributor 35 is connected to the inner cavity of the anti-vortex cover 3. An air inlet 351 and a drain outlet 352 are provided on one side of the gas distributor 35. Both the air inlet 351 and the drain outlet 352 are located in the inner cavity of the anti-vortex cover 3. Filter screens are provided in the inner cavities of both the air inlet 351 and the drain outlet 352 to prevent impurities in the seawater and welding debris from entering the pipeline and causing blockage, ensuring smooth air and water passages. A one-way constant pressure relief valve 354 is provided at the top of the gas distributor 35 and is connected to the inner top wall of the anti-vortex cover 3. When the pressure inside the anti-vortex cover 3... When the cavity pressure exceeds the set threshold, it can automatically overflow and release pressure to maintain a stable slightly positive pressure state in the cavity, avoiding damage to the seals due to excessive pressure and preventing seawater backflow due to excessively low pressure. The outer wall of the gas distributor 35 is equipped with a one-way constant pressure drain valve 355 that communicates with the inner cavity of the drain port 352. As the pressure of the inert gas in the cavity increases, the seawater in the anti-vortex cover 3 can be completely discharged through the one-way constant pressure drain valve 355. With the continuous introduction of inert gas, a stable dry vapor phase welding environment is built in the anti-vortex cover 3, solving the problems of water flow interference and insufficient molten pool protection in wet welding and semi-dry welding.

[0030] In this embodiment, a fixed base 10 is provided at one end of the first waterproof motor 5. One end of the fixed base 10 is connected to the clamping base 6, and the other end of the fixed base 10 is connected to the base 1, forming an overall rigid frame of the equipment to ensure the coaxiality and structural stability of the installation positions of each component. The inner cavities of the fixed base 10, the clamping base 6, and the base 1 are all provided with inner wiring grooves 11 that communicate with the inner cavity of the underwater pipeline harness anti-twist protection tube 13. The power supply cables, control cables, hydraulic lines, and air supply lines of the equipment can all be integrated and laid in the inner wiring grooves 11 to achieve centralized protection of the pipelines and avoid the problems of entanglement, scratching and damage caused by the exposure of underwater pipelines. At the same time, it improves the overall neatness and ease of operation of the equipment. Multiple handrails 12 are provided on the side wall of the fixed base 10, which makes it convenient for the staff to hold and operate the equipment underwater, flexibly adjust the position and posture of the equipment, and adapt to different underwater operation scenarios.

[0031] In this embodiment, the top of the clamping seat 6 is inserted with an underwater pipeline harness anti-torsion protection tube 13, which can integrate and cover the power supply cables, gas pipelines, and hydraulic pipelines at the surface, and centrally transport them to the corresponding mechanism of the equipment. This avoids the problems of entanglement, stretching and breakage caused by the dispersion of underwater pipelines. At the same time, its built-in reinforcing layer can improve the tensile and torsional performance of the pipelines, adapting to the needs of underwater towing and movement operations. A gas valve 14 is provided on the side wall of the clamping seat 6, and the underwater pipeline harness anti-torsion protection tube 13 is sleeved on the outside of one end of the two air inlet pipes 4. The gas valve 14 can control the on and off of the inert gas and the air inlet pressure, so as to achieve precise control of the sealing and welding environment construction, and the operation is convenient and controllable.

[0032] In this embodiment, underwater lifting drive units are provided on both sides of the clamping base 6. The underwater lifting drive unit includes multiple guide channels, a turbofan located in the guide channel, a drive motor connected to the turbofan, and a control module electrically connected to the drive motor. The underwater lifting drive unit is an existing underwater drive device. It can generate directional thrust and auxiliary buoyancy through the rotation of the turbofan to offset the weight of the equipment underwater and reduce the workload of the staff. At the same time, the speed and direction of the turbofan can be adjusted by the control module to realize the attitude adjustment, axial movement and position calibration of the equipment underwater, improve the operational flexibility of the equipment in complex underwater environments, and also provide auxiliary driving force for the axial movement of the equipment during the pipeline cleaning stage.

[0033] In this embodiment, the clamping assembly 7 includes a primary clamping claw 71 mounted on the base 1 and the clamping seat 6. The inner wall of the primary clamping claw 71 is provided with anti-slip grooves, which can increase the clamping friction with the outer wall of the pipe and effectively resist the relative displacement and overall shaking of the equipment and pipe caused by the impact of underwater water flow. This blocks the transmission of vibration to the welding assembly 2 from the source and avoids problems such as welding torch trajectory deviation and resonance interference during the welding process. The other end of the primary clamping claw 71 is hinged to a secondary clamping claw 73. Multiple rolling steel balls are rotatably connected to the inner wall of the secondary clamping claw 73, which can form a low-resistance contact with the outer wall of the pipe during the pipe surface cleaning stage. The force-sliding clamping ensures the coaxiality of the equipment and the pipe to be cleaned, avoiding the problem of scraper 95 deflection and blind spots during cleaning, while also not hindering the equipment from sliding up and down along the pipe axis. Together with the pipe cleaning component 9, it achieves full-range, dead-angle-free cleaning of the welded sealing area. The secondary gripper 73 is equipped with a hydraulic telescopic rod 75, the other end of which is installed on the side wall of the primary gripper 71. By extending and retracting the hydraulic telescopic rod 75, the secondary gripper 73 can be opened and closed. At the same time, the clamping range can be flexibly adjusted to adapt to the clamping requirements of pipes with different diameters, improving the equipment's adaptability to operating conditions.

[0034] In this embodiment, the pipe cleaning assembly 9 includes a rotating track 91 hinged to the bottom of the base 1. A slip ring 92 is slidably connected to the inner cavity of the rotating track 91. Multiple elastic telescopic rods 93 are arranged in an array on the slip ring 92. Springs are sleeved on the outer sides of the multiple elastic telescopic rods 93. The multiple elastic telescopic rods 93 are connected to a drive ring 94. The drive ring 94 is located in the inner cavity of the slip ring 92. Gear grooves are formed on the inner side wall of the drive ring 94 to mesh with the gears at the power output end of the second waterproof motor 8. Scrapers 95 are provided at the other ends of the multiple elastic telescopic rods 93. Driven by the second waterproof motor 8, the drive ring 94 can be driven to rotate circumferentially along the rotating track 91, thereby driving multiple sets of scrapers 95 to perform a circumferential scraping operation along the outer wall of the pipe. The springs built into the elastic telescopic rods 93 can push the scrapers 95 to adaptively conform to the outer wall of the pipe. Even if there are slight curvature changes or unevenness in the pipe, the scrapers 95 can be kept in stable contact with the pipe wall to remove the attached substances.

[0035] In this embodiment, both the rotating track 91 and the drive ring 94 are provided with a snap-fit ​​component 96 and a snap-fit ​​groove 97 that mates with the snap-fit ​​component 96 at one end. A rectangular cut is provided at one end of the rotating track 91 to facilitate the quick snap-fit ​​of the cleaning component onto the outer wall of the pipe without having to insert it from the end of the pipe, thus meeting the convenience requirements of underwater on-site operations. The side wall of the rotating track 91 is also provided with a telescopic positioning snap-fit ​​component 98 that mates with the rectangular cut and an unlocking button that abuts against the telescopic positioning snap-fit ​​component 98. After snapping, the circumferential locking of the rotating track 91 and the drive ring 94 can be achieved through the snap-fit ​​component 96 and the snap-fit ​​groove 97, and the axial locking can be achieved through the telescopic positioning snap-fit ​​component 98, ensuring the stability of the structure during the cleaning operation and avoiding loosening or displacement problems. Pressing the unlocking button can quickly unlock and close the device, making the operation convenient and meeting the one-handed operation requirements of underwater workers.

[0036] In this embodiment, multiple anti-arc light tempered glass windows are provided on the outer wall of the anti-vortex cover 3, which can effectively isolate the strong arc light generated during the welding process, avoid hurting the eyes of the workers, ensure the safety of personnel working underwater, and at the same time facilitate the workers to observe the welding status inside the anti-vortex cover 3 from multiple angles in real time, and adjust the welding parameters and equipment posture as needed to ensure the quality of the welding operation.

[0037] Working principle: During use, staff lower the equipment to the underwater work area, hold the handle bar 12 to operate the equipment, and simultaneously start the underwater lifting drive unit. The drive motor drives the turbofan to rotate, generating directional thrust and auxiliary buoyancy to counteract the equipment's own weight underwater, reducing the workload of the staff. At the same time, the turbofan speed and direction can be adjusted through the control module to realize the attitude adjustment, axial movement and position calibration of the equipment underwater, improving the operational flexibility of the equipment in complex underwater environments, and also providing auxiliary driving force for the axial movement of the equipment during the pipeline cleaning stage.

[0038] Phase 1: Pre-cleaning of deposits on the outer wall of the pipe The operator moves the equipment from top to bottom along the axial direction of the pipe to be welded. After reaching the preset welding position, the hydraulic telescopic rods 75 of the two sets of clamping components 7 are activated to drive the secondary gripper 73 to close, so that the rolling steel ball on the inner side of the secondary gripper 73 fits against the outer wall of the pipe, forming an axially sliding auxiliary clamp, which ensures the coaxiality of the equipment and the pipe without affecting the axial movement of the equipment. Then, the rotating track 91 and the drive ring 94 of the pipe cleaning component 9 are fastened to the outer wall of the pipe along the rectangular cut. The circumferential locking of the rotating track 91 and the drive ring 94 is achieved by the cooperation of the snap fastener 96 and the snap fastener groove 97. At the same time, the telescopic positioning snap fastener 98 automatically engages to achieve axial locking. At this time, under the elastic force of the internal spring, the elastic telescopic rod 93 pushes the scraper 95 to adaptively fit against the outer wall of the pipe, and the tooth groove on the inner side of the drive ring 94 meshes with the gear at the power output end of the second waterproof motor 8.

[0039] The second waterproof motor 8 is started, and the drive ring 94 is driven to rotate circumferentially along the rotating track 91 through gear meshing transmission. This drives multiple sets of scrapers 95 to perform a circumferential scraping operation along the outer wall of the pipe. During this process, the operator can control the equipment to slide up and down along the pipe axis, and with the rotation of the scrapers 95, remove marine organisms, calcification layers, rust and other impurities attached to the outer wall of the pipe's welded sealing area. This creates a smooth and clean sealing surface on the outer wall of the pipe, preventing subsequent sealing failures caused by unevenness on the pipe surface from the source.

[0040] The second stage involves rigid clamping and fixing of the equipment and pipelines. After cleaning the pipe surface, the staff manipulated the equipment to move axially so that the welding gun of the welding component 2 was precisely aligned with the butt weld of the two pipe sections; then the hydraulic telescopic rod 75 was controlled to drive the secondary clamp 73 to open, and the hydraulic drive structure of the two sets of clamping components 7 was activated to drive the two primary clamps 71 on the base 1 and the clamping seat 6 to close synchronously, so as to perform full circumferential rigid clamping on the two pipe sections to be connected.

[0041] The anti-slip grooves on the inner wall of the primary gripper 71 can increase the gripping friction with the outer wall of the pipe, resisting the shaking and displacement of the pipe caused by the impact of underwater water flow; at the same time, the two sets of symmetrically arranged primary grippers 71 can ensure the coaxiality of the two sections of pipe to be welded, avoid the transmission of pipe vibration to the welding assembly 2, prevent resonance and welding torch trajectory deviation during the welding process, and provide stable and undisturbed conditions for subsequent welding operations.

[0042] The third stage involves sealing the dry welding cavity and constructing the welding environment. After clamping and fixing, the extension length and welding angle of the welding torch are pre-adjusted via the retractable welding torch holder to ensure precise alignment of the welding torch tip with the weld seam of the pipe. Then, the two symmetrically hinged anti-vortex covers 3 are closed and mechanically locked, so that the anti-vortex covers 3 completely cover the welding assembly 2 and the welding operation area. The gas valve 14 on the clamping seat 6 is opened to deliver external high-purity argon gas through the gas supply pipeline and inlet pipe 4 in the underwater pipeline harness anti-torsion protection pipe 13 to the gas distributor 35. The gas distributor 35 divides the gas into two paths to complete the sealing and environmental construction. Sealing Path: Argon gas is delivered to the expansion chamber 33 at the pipe clamp interface 31 via the gas distributor 35 and fills the inside of the fluororubber ring 34, causing the fluororubber ring 34 to inflate and expand, adaptively fitting the outer wall of the pipe and completely sealing the annular gap between the pipe clamp interface 31 and the pipe. This flexible inflation sealing method can adaptively fill the slight depressions and deformations of the outer wall of the pipe, solving the fitting gap problem of rigid seals. At the same time, the flexible fluororubber ring 34 can form a buffer and vibration isolation layer, blocking the vibration generated by the water flow impact on the pipe from being transmitted to the anti-vortex cover 3 and welding assembly 2, further ensuring the stability of the welding process. Simultaneously, argon gas is filled into the gas sealing ring 36 in the annular groove at the motor shaft clamp interface 32, causing the gas sealing ring 36 to expand and fit tightly against the outer wall of the support cylinder 24 and the drive shaft of the first waterproof motor 5, achieving full circumferential sealing of the dynamic and static joints and preventing seawater from seeping in through the mating gap.

[0043] Environment construction path: Argon gas is continuously injected into the inner cavity of the anti-vortex cover 3 through the gas inlet 351 of the gas distributor 35. As the argon gas pressure in the inner cavity increases, the seawater in the cavity is continuously squeezed and completely discharged to the outside of the anti-vortex cover 3 through the one-way constant pressure drain valve 355 at the bottom. When the pressure in the inner cavity is 0.2MPa higher than the external seawater pressure, a stable micro-positive pressure dry gas phase welding environment can be formed. Excess pressure can be automatically overflowed and discharged through the one-way constant pressure relief valve 354 at the top to maintain the stability of the inner cavity pressure. The continuously introduced high-purity argon gas can isolate seawater from oxygen, avoid oxidation of the high-temperature weld pool, and prevent defects such as porosity, cracks, and slag inclusions in the weld. This solves the problems of water flow interference and insufficient weld pool protection in wet welding and semi-dry welding.

[0044] The fourth stage involves circumferential welding and final finishing work. After the dry welding environment is set up, the welding power supply and the first waterproof motor 5 are started. The first waterproof motor 5 drives the gear ring 23 to rotate circumferentially along the annular seat 22 through gear meshing transmission. Then, the retractable welding torch holder drives the welding torch to perform 360° circumferential welding operation along the pipe butt weld. During the welding process, the retractable welding torch holder can ensure that the distance between the welding torch and the weld is always stable. The anti-vortex cover 3 can completely isolate the vortex impact of the external water flow. The micro-positive pressure argon gas in the inner cavity continuously provides protection for the molten pool. The staff can observe the internal welding status in real time from multiple angles through the anti-arc light tempered viewing window on the side wall of the anti-vortex cover 3 and adjust the welding parameters and welding torch position as needed.

[0045] After the welding operation is completed, first close the gas valve 14 to stop the gas supply, open the pressure relief passage to release the pressure inside the anti-vortex cover 3, then unlock the anti-vortex cover 3 in sequence, control the clamping assembly 7 to release the first-stage clamp 71, separate the equipment from the pipeline, and complete the welding operation of this pipeline joint.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pipe joint welding device, characterized in that, The system includes a base (1), a welding assembly (2) fixedly connected to the top of the base (1), an anti-vortex cover (3) sleeved on the outside of the welding assembly (2), an air inlet pipe (4) on the side wall of the anti-vortex cover (3), a first waterproof motor (5) drivenly connected to the top of the welding assembly (2), a clamping seat (6) on one side of the first waterproof motor (5); a clamping assembly (7) on one side of both the base (1) and the clamping seat (6); a second waterproof motor (8) is also provided on the base (1), and a pipe cleaning assembly (9) is drivenly connected to the power end of the second waterproof motor (8); the welding assembly (2) includes a fixing plate ( 21), the top of the fixed plate (21) is provided with an annular seat (22), and a toothed ring (23) is rotatably connected to the outer side of the annular seat (22). A retractable welding gun seat is provided on the toothed ring (23), and a welding gun is provided inside the retractable welding gun seat; multiple gears are meshed at the other end of the toothed ring (23), and one end of the gear is connected to the power output end of the first waterproof motor (5); a support cylinder (24) is provided at the bottom end of the fixed plate (21), and the bottom end of the support cylinder (24) is installed at the top of the base (1); a wire sealing sleeve (25) is provided on the side wall of the support cylinder (24); two anti-vortex covers (3) are provided, and the two anti-vortex covers are provided with a wire sealing sleeve (25). The vortex shield (3) is symmetrically hinged on the base (1). The top and bottom ends of the vortex shield (3) are provided with pipe clamp interfaces (31) and motor shaft clamp interfaces (32). An expansion chamber (33) is provided on the inner side wall of the pipe clamp interface (31). A fluororubber ring (34) is connected to the inner cavity of the expansion chamber (33). A gas connecting pipe is provided at one end of the fluororubber ring (34). A gas distributor (35) is connected to the other end of the gas connecting pipe. An annular groove is provided on the inner side wall of the motor shaft clamp interface (32). An air sealing ring (36) is provided in the inner cavity of the annular groove. One end of the air inlet pipe (4) is connected to the insertion point. On the gas splitter (35), the gas splitter (35) is connected to the inner cavity of the anti-vortex cover (3). The gas splitter (35) has an air inlet (351) and a drain outlet (352) on one side. The air inlet (351) and the drain outlet (352) are both located in the inner cavity of the anti-vortex cover (3). The inner cavities of the air inlet (351) and the drain outlet (352) are both equipped with filters. The top of the gas splitter (35) is equipped with a one-way constant pressure relief valve (354) that is connected to the inner top wall of the anti-vortex cover (3). The outer wall of the gas splitter (35) is equipped with a one-way constant pressure drain valve (355) that is connected to the inner side wall of the drain outlet (352).

2. The pipe joint welding equipment according to claim 1, characterized in that, The first waterproof motor (5) has a fixed seat (10) at one end. One end of the fixed seat (10) is connected to the clamping seat (6), and the other end of the fixed seat (10) is connected to the base (1). The inner cavity of the fixed seat (10), the clamping seat (6) and the base (1) are all provided with an inner cable routing groove (11) that communicates with the inner cavity of the underwater pipeline harness anti-twist protection tube (13). The side wall of the fixed seat (10) is provided with multiple handrails (12).

3. The pipe joint welding equipment according to claim 2, characterized in that, The top of the clamping seat (6) is connected to an underwater pipeline harness anti-twist protection tube (13), and a gas valve (14) is provided on the side wall of the clamping seat (6). The underwater pipeline harness anti-twist protection tube (13) is sleeved on the outside of one end of the two air inlet pipes (4).

4. The pipe joint welding equipment according to claim 3, characterized in that, The clamping assembly (7) includes a primary clamping jaw (71) mounted on the base (1) and the clamping seat (6). The inner wall of the primary clamping jaw (71) is provided with an anti-slip groove. The other end of the primary clamping jaw (71) is hinged to a secondary clamping jaw (73). Multiple rolling steel balls are rotatably connected to the inner side wall of the secondary clamping jaw (73). The secondary clamping jaw (73) is provided with a hydraulic telescopic rod (75). The other end of the hydraulic telescopic rod (75) is mounted on the side wall of the primary clamping jaw (71).

5. The pipe joint welding equipment according to claim 1, characterized in that, The pipe cleaning assembly (9) includes a rotating track (91) hinged to the bottom of the base (1). A slip ring (92) is slidably connected to the inner cavity of the rotating track (91). Multiple elastic telescopic rods (93) are arranged in an array on the slip ring (92). Springs are sleeved on the outer side of each of the multiple elastic telescopic rods (93). The multiple elastic telescopic rods (93) are connected to a drive ring (94). The drive ring (94) is located in the inner cavity of the slip ring (92). A toothed groove is opened on the inner side wall of the drive ring (94) to mesh with the gear at the power output end of the second waterproof motor (8). A scraper (95) is provided at the other end of each of the multiple elastic telescopic rods (93). Both the rotating track (91) and the drive ring (94) are provided with a snap-fit ​​piece (96) and a snap-fit ​​groove (97) that cooperates with the snap-fit ​​piece (96) at one end. A rectangular cut is provided at one end of the rotating track (91). The side wall of the rotating track (91) is also provided with a telescopic positioning piece (98) that cooperates with the rectangular cut and an unlocking button that abuts against the telescopic positioning piece (98).

6. The pipe joint welding equipment according to claim 1, characterized in that, Multiple anti-arc light tempered windows are provided on the outer wall of the anti-vortex cover (3).

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