A pipe welding device for shipbuilding

Abstract

The application discloses a pipeline welding device for ship manufacturing and belongs to the technical field of ship pipeline welding, which comprises a first arc-shaped plate, a second arc-shaped plate is hinged to the first arc-shaped plate, and a threaded rod is arranged at the end, away from the hinge joint, of the first arc-shaped plate and the second arc-shaped plate.The first spring, the fixed rod and the clamping plate are matched, so that automatic centering and clamping can be realized after pipeline butt joint, the clamping and fixing requirements of ship pipelines with different diameters can be met, and the problems of deviation, loosening and slight shaking in the pipeline welding process can be effectively avoided.Meanwhile, the electromagnet is powered on to cooperate with the magnet block and the sliding rod to lock the position of the fixed rod when welding, the elastic shaking of the first spring during operation is limited, the unstable clamping problem caused by the reciprocating deformation of the spring is completely solved, the elastic air bag can be prevented from being damaged by welding slag, the welding quality is effectively improved, and the safety hidden danger is reduced.

Description

Technical Field

[0001] This invention relates to the field of marine pipeline welding technology, and more specifically, to a pipeline welding apparatus for shipbuilding. Background Technology

[0002] Marine pipelines are the core carriers of ship power transmission, fire protection, seawater circulation, and hydraulic control. Pipeline welding accounts for a very high proportion of the total shipbuilding time, and the quality of the welds directly determines the ship's pressure-bearing safety and seawater corrosion resistance.

[0003] Currently, ship pipe welding is usually done manually on-site by workers. However, some pipes are located inside the ship's cabins. When welding is carried out inside the cabins, a large amount of smoke is generated during the welding process. Since the ventilation conditions inside the cabins are poor, the smoke drifts in the working environment, which can easily affect the health of the operators and poses a safety hazard.

[0004] To address the aforementioned issues, some solutions have been proposed in existing technologies. For example, Chinese invention application CN 120885925 A discloses a pipe welding device for shipbuilding. This device uses an inflatable arc-shaped airbag to block both sides of the welding area. Combined with upper and lower arc-shaped plates, it can cover the welding position, preventing the dispersion of welding fumes and protecting the health of workers. This effectively protects the work area environment and reduces safety hazards during welding. While existing technologies reduce safety hazards to some extent, in actual welding, spatter can easily land on the airbag surface, causing it to rupture. Furthermore, existing technologies use airbags to fix the welding device; due to the compressibility of gas, this can cause the welding device to shake during welding, affecting welding quality and creating serious safety hazards. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a pipe welding device for shipbuilding, which can improve welding quality and eliminate safety hazards.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A pipe welding device for shipbuilding includes a first arc-shaped plate, and a second arc-shaped plate is hinged to the first arc-shaped plate. A threaded rod is installed on the ends of both the first and second arc-shaped plates away from the hinge point. An mounting plate is installed on both the first and second arc-shaped plates. A welding machine is mounted on the mounting plate, and a controller electrically connected to the welding machine is also mounted on the mounting plate. Elastic airbags are fixedly mounted on both the first and second arc-shaped plates. A purification component that cooperates with the elastic airbag is provided on the first arc-shaped plate. Dense brushes that cooperate with the elastic airbag are uniformly fixedly mounted on both the first and second arc-shaped plates. A fixing component is provided on both the first and second arc-shaped plates. The fixing assembly includes sleeves that are fixedly installed on the inner walls of the first arc-shaped plate and the second arc-shaped plate, respectively. A fixing rod is slidably installed inside the sleeve. A first spring is installed between the fixing rod and the sleeve, and a clamping plate is fixedly installed at the end of the fixing rod away from the first spring.

[0008] Furthermore, a gear ring is fixedly mounted on the mounting plate, and a slide plate is slidably mounted on the mounting plate. A motor is fixedly mounted on the slide plate, and a gear that meshes with the gear ring is fixedly mounted on the output end of the motor. An electric push rod is fixedly mounted on the slide plate, and a mounting block is fixedly mounted on the output end of the electric push rod. The welding machine is fixedly mounted on the mounting block, and the controller is fixedly mounted on the side wall of the mounting block away from the welding machine.

[0009] Furthermore, a slide rod is slidably mounted on the fixed rod, a second spring is installed between the slide rod and the fixed rod, a magnet is fixedly mounted on the slide rod, an electromagnet is fixedly mounted on the fixed rod, and the electromagnet is electrically connected to the electric push rod. Fixed holes that cooperate with the slide rod are evenly opened inside the sleeve.

[0010] Furthermore, the fixing rod and the sleeve are slidably sealed together, the clamping plate has a cavity, the cavity has evenly spaced air holes, the cavity has a first air tube inserted into it, the sliding rod has a connecting groove, and the fixing rod has a hole communicating with the connecting groove, and the sliding rod and the fixing rod are slidably sealed together.

[0011] Furthermore, a spring telescopic rod is fixedly installed on the mounting block, a third arc-shaped plate is fixedly installed on the output end of the spring telescopic rod, and ball bearings are evenly fixedly installed on the third arc-shaped plate. A position sensor electrically connected to the controller is fixedly installed inside the spring telescopic rod.

[0012] Furthermore, limit rods are symmetrically fixedly installed on the mounting plate, guide plates are slidably installed on the limit rods, and a third spring is installed between the guide plate and the mounting plate. The limit plate is detachably installed on the guide plate, and a connecting rope is fixedly installed on the guide plate, with the end of the connecting rope away from the guide plate being fixedly connected to the mounting block.

[0013] Furthermore, a guide wheel that cooperates with the connecting rope is rotatably mounted on the mounting plate.

[0014] Furthermore, the purification assembly includes a filter box fixedly installed on the first arc-shaped plate, an air pump fixedly installed on the filter box, and an air inlet pipe fixedly installed on the filter box extending into the first arc-shaped plate.

[0015] Furthermore, a sealing gasket is fixedly installed on the clamping plate.

[0016] Furthermore, an exhaust valve with an output end connected to the outside is fixedly installed on the sleeve.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This solution can automatically center and clamp the pipe after the pipe is connected by the cooperation of the first spring, the fixing rod and the clamping plate. It can adapt to the clamping and fixing requirements of ship pipes of different diameters and effectively avoid the problems of displacement, loosening and slight shaking during pipe welding. At the same time, when the welding operation is performed, the electromagnet is energized and the fixing rod is locked in place by the magnet block and the sliding rod, which limits the elastic vibration of the first spring during operation. This effectively overcomes the problem of clamping instability caused by the reciprocating deformation of the spring. In addition, the dense brush can prevent the welding slag from damaging the elastic air bag, which effectively improves the welding quality and reduces safety hazards.

[0018] (2) By opening a cavity, the pressure in the space on the side of the sleeve away from the first spring when the pipe drives the fixed rod to compress the first spring is reduced. Then, when the slide rod is inserted into the fixed hole, the slide rod drives the connecting groove to connect with the first air pipe. At this time, the space on the side of the sleeve away from the first spring through the hole, the connecting groove and the first air pipe draws air from the cavity and makes the pipe and the clamping plate adhere together, so as to assist in clamping the pipe, effectively avoid the pipe and the clamping plate from sliding, and further improve the welding quality.

[0019] (3) By setting a limiting plate, the limiting plate can be inserted into the gap between the butt welds of the two pipes before welding. This not only standardizes and reserves a compliant welding gap, avoiding the pipes being too tight or the gap being too large, thus affecting the welding quality, but also accurately calibrates the working position of the welding machine. When welding is required, as the installation block moves, the connecting rope is pulled synchronously, causing the guide plate to slide along the limiting rod, compressing the third spring, and at the same time pulling out the limiting plate stuck in the pipe weld, so that it is completely removed from the welding area, effectively improving the welding quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the first arc-shaped plate of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a combined diagram of the sliding plate, mounting block, and limiting plate of the present invention; Figure 5 This is a diagram showing the combination of the motor and gears of the present invention; Figure 6 This is a cross-sectional view of the sleeve, mounting rod, and clamping plate of the present invention; Figure 7 For the present invention Figure 6 Enlarged view at point B in the middle; Figure 8 This is a diagram showing the combination of the connecting rope and the guide wheel of the present invention; Figure 9 This is a diagram showing the combination of the spring telescopic rod and the position sensor of the present invention.

[0021] Explanation of the labels in the diagram: 101. First arc-shaped plate; 102. Second arc-shaped plate; 103. Threaded rod; 104. Mounting plate; 105. Welding machine; 106. Controller; 107. Elastic airbag; 108. Dense mesh brush; 2. Fixing assembly; 201. Sleeve; 202. Fixing rod; 203. First spring; 204. Clamping plate; 301. Gear ring; 302. Slide plate; 303. Motor; 304. Gear; 305. Electric actuator; 306. Mounting block; 401. Sliding rod; 402. Second spring; 403. Magnet block; 404. Electromagnet; 405. Fixing hole; 406. Cavity; 407. First air tube; 408. Connecting groove; 409. Hole; 501. Spring telescopic rod; 502. Third arc plate; 503. Ball bearing; 504. Position sensor; 505. Limiting rod; 506. Guide plate; 507. Third spring; 508. Limiting plate; 509. Connecting rope; 510. Guide wheel; 601. Filter box; 602. Air pump; 603. Air inlet pipe; 604. Sealing gasket; 605. Exhaust valve. Detailed Implementation

[0022] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 9 A pipe welding device for shipbuilding includes a first arc plate 101, and a second arc plate 102 is hinged to the first arc plate 101. A threaded rod 103 is installed on the ends of the first arc plate 101 and the second arc plate 102 away from the hinge point. An mounting plate 104 is installed on both the first arc plate 101 and the second arc plate 102. A welding machine 105 is provided on the mounting plate 104, and a controller 106 electrically connected to the welding machine 105 is provided on the mounting plate 104. An elastic airbag 107 is fixedly installed on both the first arc plate 101 and the second arc plate 102. A purification component that cooperates with the elastic airbag 107 is provided on the first arc plate 101. A fine brush 108 that cooperates with the elastic airbag 107 is uniformly fixedly installed on the first arc plate 101 and the second arc plate 102. A fixing component 2 is provided on the first arc plate 101 and the second arc plate 102. The fixing component 2 includes a sleeve 201 that is fixedly installed on the inner walls of the first arc plate 101 and the second arc plate 102 respectively. A fixing rod 202 is slidably installed inside the sleeve 201. A first spring 203 is installed between the fixing rod 202 and the sleeve 201. A clamping plate 204 is fixedly installed at the end of the fixing rod 202 away from the first spring 203.

[0024] In use, the clamping plate 204 at the first arc plate 101 is first attached to one side of the pipe. Then, the second arc plate 102 is rotated, and the first arc plate 101 and the second arc plate 102 are fixed together by the threaded rod 103. At the same time, as the second arc plate 102 is fixed to the first arc plate 101, the second arc plate 102 drives the corresponding clamping plate 204 to be attached to the other side of the pipe. At this time, the two first springs 203 are located on both sides of the pipe. At the same time, when the first arc plate 101 and the second arc plate 102 are closed, the pipe compresses the first springs 203 through the clamping plate 204. Then, under the action of its own elasticity, the first springs 203 clamp the pipe in the center through the fixing rod 202 and the clamping plate 204. When the first arc plate 101 and the second arc plate 102 are closed, the elastic airbags 107 at both ends of the first arc plate 101 and the second arc plate 102 can seal the space formed by the first arc plate 101 and the second arc plate 102. Then, the purification component can purify the fumes during the welding process. At the same time, the elastic airbags 107 at both ends can also help to clamp the pipe. It should be noted that the bristles of the fine brush 108 are preferably made of fire-retardant materials such as flame-retardant carbon fiber, quartz glass fiber or aramid. The surface of the elastic airbag 107 is preferably vulcanized with a flame-retardant rubber coating or laminated with fire-retardant cloth, which can prevent the elastic airbag 107 from being damaged by the splashed welding slag, thereby effectively preventing the pipe from shaking and the welding device from falling off during the welding process, which plays a role in improving the welding quality and reducing safety hazards.

[0025] like Figures 2 to 8 As shown, a gear ring 301 is fixedly mounted on the mounting plate 104, and a slide plate 302 is slidably mounted on the mounting plate 104. A motor 303 is fixedly mounted on the slide plate 302, and a gear 304 that meshes with the gear ring 301 is fixedly mounted on the output end of the motor 303. An electric push rod 305 is fixedly mounted on the slide plate 302, and a mounting block 306 is fixedly mounted on the output end of the electric push rod 305. The welding machine 105 is fixedly mounted on the mounting block 306, and the controller 106 is fixedly mounted on the side wall of the mounting block 306 away from the welding machine 105.

[0026] A slide rod 401 is slidably mounted on the fixed rod 202. A second spring 402 is installed between the slide rod 401 and the fixed rod 202. A magnet block 403 is fixedly mounted on the slide rod 401. An electromagnet 404 is fixedly mounted on the fixed rod 202. The electromagnet 404 is electrically connected to the electric push rod 305. Fixing holes 405 that cooperate with the slide rod 401 are evenly opened inside the sleeve 201.

[0027] The fixed rod 202 and the sleeve 201 are slidably sealed together. The clamping plate 204 has a cavity 406 with evenly distributed air holes. A first air pipe 407 is inserted into the cavity 406. The sliding rod 401 has a connecting groove 408, and the fixed rod 202 has a hole 409 communicating with the connecting groove 408. The sliding rod 401 and the fixed rod 202 are slidably sealed together.

[0028] By adopting the above technical solution, after the clamping plate 204 clamps the pipe, the controller 106 first controls the output end of the electric push rod 305 to extend and drive the mounting block 306 to move. During the movement of the mounting block 306, the welding machine 105 is driven to move towards the pipe weld position. After the welding machine 105 reaches the appropriate position, the welding machine 105 is energized to weld the weld. When the welding machine 105 is energized, the controller 106 controls the electromagnet 404 to be energized. Then, the magnet block 403 drives the slide rod 401 to insert into the fixing hole 405. It should be noted that the end of the slide rod 401 near the fixing hole 405 is a funnel-shaped guide slope. If the end of the slide rod 401 deviates from the center of the fixing hole 405, the slide rod 401 can be forcibly and accurately guided into the nearest fixing hole 405 to achieve smooth locking. At this time, the second spring 402 is stretched and has a tendency to return to its original state, thereby avoiding the fixing rod 202 from causing the first spring 203 to vibrate during the welding process, effectively improving the stability of the welding.

[0029] During the process of the pipe driving the fixed rod 202 to compress the first spring 203, the pressure in the space of the sleeve 201 located on the side of the fixed rod 202 away from the first spring 203 decreases. Then, when the slide rod 401 is inserted into the fixed hole 405, the slide rod 401 drives the connecting groove 408 to connect with the first air pipe 407. At this time, the space of the sleeve 201 located on the side of the fixed rod 202 away from the first spring 203 draws air from the cavity 406 through the hole 409, the connecting groove 408, and the first air pipe 407, which reduces the pressure in the cavity 406. Then, the cavity 406 draws air from the outside through the air hole. Since the clamping plate 204 is in contact with the pipe at this time, under the action of atmospheric pressure difference, the pipe and the clamping plate 204 are attracted together, which can assist in clamping the pipe and effectively prevent the pipe from sliding between the pipe and the clamping plate 204, further improving the welding quality.

[0030] like Figures 4 to 8 As shown, a spring telescopic rod 501 is fixedly installed on the mounting block 306, a third arc-shaped plate 502 is fixedly installed on the output end of the spring telescopic rod 501, and ball bearings 503 are evenly fixedly installed on the third arc-shaped plate 502. A position sensor 504 electrically connected to the controller 106 is fixedly installed inside the spring telescopic rod 501.

[0031] Limiting rods 505 are symmetrically fixedly installed on the mounting plate 104. A guide plate 506 is slidably installed on the limiting rods 505. A third spring 507 is installed between the guide plate 506 and the mounting plate 104. A limiting plate 508 is detachably installed on the guide plate 506. A connecting rope 509 is fixedly installed on the guide plate 506. The end of the connecting rope 509 away from the guide plate 506 is fixedly connected to the mounting block 306.

[0032] The mounting plate 104 is rotatably mounted with a guide wheel 510 that cooperates with the connecting rope 509.

[0033] By adopting the above technical solution, when the output end of the electric push rod 305 extends and drives the mounting block 306 to move, the mounting block 306 drives the third arc plate 502 to move through the spring telescopic rod 501, and the third arc plate 502 gradually contacts the pipe. Then, as the mounting block 306 continues to move, the pipe compresses the third spring 507. After the welding machine 105 and the pipe reach a suitable welding distance, the spring telescopic rod 501 triggers the position sensor 504. After the controller 106 receives the signal from the position sensor 504, the electric push rod 305 stops extending, which makes it easier to determine the position of the welding machine 105. During welding, the motor 303 drives the gear 304 to rotate. Since the gear 304 meshes with the gear ring 301, during the rotation of the gear, the gear ring 301 drives the gear to revolve around the gear ring 301. At the same time, the gear 304 drives itself to rotate around its axis. During the rotation of the gear, the slide plate 302 is driven to rotate along the mounting plate 104. It should be noted that the mounting plate 104 has an annular guide rail on the same side as the gear ring 301 that slides with the slide plate 302 to constrain the movement trajectory of the slide plate 302. Then, during the rotation of the slide plate 302, the welding machine 105 is driven to rotate around the pipe through the electric push rod 305 and the mounting block 306 to weld the pipe. During the rotation of the mounting block 306 around the pipe, the mounting block 306 drives the third arc plate 502 to rotate around the pipe through the spring telescopic rod 501. The setting of the ball bearing 503 allows the third arc plate 502 to drive the ball bearing 503 to roll on the pipe, thereby converting the sliding friction between the third arc plate 502 and the pipe into the rolling friction between the ball bearing 503 and the pipe, ensuring the normal rotation of the mounting block 306.

[0034] To improve welding results, a weld seam is typically left at the joint of two pipes during pipe welding. When fixing the first arc plate 101 and the second arc plate 102, the limiting plate 508 is first inserted into the weld seam between the two pipes. After the limiting plate 508 is inserted into the weld seam, the first arc plate 101 and the second arc plate 102 are threaded together, and the pipes are clamped by the clamping plate 204. The setting of the limiting plate 508 ensures that a weld seam is left at the pipe joint, and also ensures that after the first arc plate 101 and the second arc plate 102 are threaded together, the position of the welding machine 105 is directly opposite the weld seam, thereby effectively improving the welding quality.

[0035] The guide wheel 510 is located at the intersection of the lateral extension line of the moving trajectory of the limiting rod 505 and the mounting block 306. One end of the connecting rope 509 is fixed to the mounting block 306. After extending along the forward direction of the mounting block 306 and passing around the two guide wheels 510 to generate two reversals, the other end pulls the guide plate 506 in the opposite direction to slide along the limiting rod 505. This accurately converts the longitudinal thrust of the mounting block 306 forward into the lateral pulling force of the limiting plate 508. Then, when the output end of the electric push rod 305 extends and drives the mounting block 306 to move, the mounting block 306 drives the guide plate 506 to slide along the limiting rod 505 through the connecting rope 509. At this time, the third spring 507 is compressed and has a tendency to recover. During the movement of the guide plate 506, it drives the limiting plate 508 away from the weld seam. The setting of the guide wheel 510 can turn the connecting rope 509 to avoid the connecting rope 509 getting stuck on the mounting plate 104, thereby avoiding the guide plate 506 from affecting the pipeline welding.

[0036] like Figure 1 , Figure 2 , Figure 6 As shown, the purification assembly includes a filter box 601 fixedly installed on the first arc-shaped plate 101, an air pump 602 fixedly installed on the filter box 601, and an air inlet pipe 603 extending into the first arc-shaped plate 101 fixedly installed on the filter box 601.

[0037] A sealing gasket 604 is fixedly installed on the clamping plate 204.

[0038] An exhaust valve 605 with its output end connected to the outside is fixedly installed on the sleeve 201.

[0039] By adopting the above technical solution, when the clamping plate 204 contacts the pipe, the clamping plate 204 drives the sealing gasket 604 to contact the pipe. The sealing gasket 604 can prevent the pipe from sliding between the pipe and the clamping plate 204, and improve the sealing between the clamping plate 204 and the pipe, thereby ensuring that the clamping plate 204 and the pipe are adhered together. After welding, the welding machine 105 stops working, and at the same time, the output end of the electric push rod 305 retracts and drives the mounting block 306 to reset. During the reset process of the mounting block 306, the third spring 507 extends and drives the guide plate 506 to reset. After the welding machine 105 is de-energized, the electromagnet 404 is de-energized, and then the second spring 402 retracts and drives the slide rod 401 to disengage from the fixing hole 405. Meanwhile, controller 106 controls air pump 602 to operate. Air pump 602 draws flue gas between the first arc plate 101 and the second arc plate 102 through air inlet pipe 603, and purifies the flue gas through filter box 601, effectively preventing smoke poisoning of personnel in the enclosed cabin. After the flue gas purification is completed, the threaded rod 103 is rotated to release the fixation between the first arc plate 101 and the second arc plate 102. As the first arc plate 101 and the second arc plate 102 open, the first spring 203 extends and drives the fixing rod 202 to reset. During the reset process of the fixing rod 202, excess airflow in the space inside sleeve 201 on the side of the fixing rod 202 away from the first spring 203 will be discharged through exhaust valve 605.

[0040] Instructions for use: First, precisely align the two pipes to be welded and insert the limiting plate 508 into the joint gap between the two pipes to control the width of the weld gap and lock the pipe alignment. After positioning the gap, place the first arc-shaped plate 101 against one side of the pipe, so that the corresponding clamping plate 204 initially adheres to the outer wall of the pipe. Rotate the second arc-shaped plate 102 around the hinge point, causing the second arc-shaped plate 102 to close towards the first arc-shaped plate 101, covering the other side of the pipe. Then tighten the threaded rods 103 at both ends to firmly lock and fix the first arc-shaped plate 101 and the second arc-shaped plate 102. During the closing process of the first arc-shaped plate 101 and the second arc-shaped plate 102, the sleeves 201 on both sides, the fixing rod 202, and the clamping plate 204 simultaneously adhere to the outer wall of the pipe. The pipe squeezes the clamping plate 204, pushing the fixing rod 202 to compress the first spring 203 inside the sleeve 201. With the elastic rebound force of the first spring 203, the clamping plates 204 on both sides clamp the pipe in both directions; after closing and locking, the elastic airbags 107 at both ends of the first arc plate 101 and the second arc plate 102 are compressed and adhere to the outer wall of the pipe, and completely seal the enclosed welding operation space, while also assisting in clamping the pipe; the fine brush 108 on the plate adheres to the surrounding position, blocking the welding slag spatter and protecting the elastic airbags 107 from being burned or damaged by the high temperature welding slag. Then, the controller 106 activates the electric push rod 305, which extends forward, driving the mounting block 306 and the welding machine 105 to move synchronously towards the pipe weld. During the movement of the mounting block 306, the connecting rope 509 is pulled, causing the guide plate 506 to slide along the limiting rod 505, compressing the third spring 507, and simultaneously pulling out the limiting plate 508 stuck in the pipe weld, completely removing it from the welding area. When the welding machine 105 moves forward, the spring telescopic rod 501 drives the third arc-shaped plate 502 to conform to the outer wall of the pipe, moving synchronously with the welding machine 105. When the welding machine 105 reaches the standard welding distance from the pipe weld, the position sensor 504 triggers a signal. Upon receiving the signal, the controller 106 immediately controls the electric push rod 305 to stop, locking the welding machine 105 in its working position. While the welding position is locked, the controller 106 energizes the electromagnet 404, attracting the magnet block 403 and causing the slide rod 401 to slide, so that the end of the slide rod 401 is inserted into the corresponding fixing hole 405 of the sleeve 201, stretching the second spring 402. Through the snap-fit ​​engagement between the slide rod 401 and the fixing hole 405, the relative position of the fixing rod 202 and the sleeve 201 is fixed; and during the process of the pipe squeezing the clamping plate 204 and pushing the fixing rod 202 to compress the first spring 203, a negative pressure is formed inside the sleeve 201. After the slide rod 401 is locked into the fixing hole 405, the internal connecting groove 408 of the slide rod 401 is interconnected with the hole 409 of the fixing rod 202 and the first air pipe 407. The negative pressure sleeve 201 draws air from the cavity 406 on the clamping plate 204 through the air passage, so that the cavity 406 on the clamping plate 204 forms a negative pressure state. Relying on the fine air holes on the clamping plate 204, a negative pressure adsorption force is formed on the contact surface between the clamping plate 204 and the pipe.

[0041] During welding, the controller 106 starts the welding machine 105 and the motor 303. The motor 303 drives the gear 304 to rotate, and the gear 304 meshes with the gear ring 301 to drive the slide plate 302 to slide in a ring along the mounting plate 104. This, in turn, drives the electric push rod 305, the mounting block 306 and the welding machine 105 to rotate uniformly around the pipe. During the rotation of the welding machine 105 around the pipe, it continuously performs ring welding on the butt weld of the pipe.

[0042] Finally, after the welding operation, the controller 106 synchronously starts the air pump 602. The air pump 602 draws the welding fumes generated in the enclosed space of the arc plate through the air inlet pipe 603 and sends the fumes into the filter box 601 for purification and filtration.

[0043] The above description is merely a preferred embodiment of the present invention; however, 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 its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A pipe welding device for shipbuilding, comprising a first arc-shaped plate (101), wherein a second arc-shaped plate (102) is hinged to the first arc-shaped plate (101), and a threaded rod (103) is installed on the ends of the first arc-shaped plate (101) and the second arc-shaped plate (102) away from the hinge point, characterized in that: Mounting plates (104) are installed on both the first arc plate (101) and the second arc plate (102). A welding machine (105) is provided on the mounting plate (104), and a controller (106) electrically connected to the welding machine (105) is provided on the mounting plate (104). Elastic airbags (107) are fixedly installed on both the first arc plate (101) and the second arc plate (102). A purification component that cooperates with the elastic airbag (107) is provided on the first arc plate (101). Dense brushes (108) that cooperate with the elastic airbag (107) are uniformly fixedly installed on the first arc plate (101) and the second arc plate (102). Fixing components (2) are provided on the first arc plate (101) and the second arc plate (102). The fixing component (2) includes a sleeve (201) fixedly installed on the inner walls of the first arc plate (101) and the second arc plate (102), a fixing rod (202) is slidably installed inside the sleeve (201), a first spring (203) is installed between the fixing rod (202) and the sleeve (201), and a clamping plate (204) is fixedly installed at the end of the fixing rod (202) away from the first spring (203). A gear ring (301) is fixedly mounted on the mounting plate (104), and a slide plate (302) is slidably mounted on the mounting plate (104). A motor (303) is fixedly mounted on the slide plate (302), and a gear (304) meshing with the gear ring (301) is fixedly mounted on the output end of the motor (303). An electric push rod (305) is fixedly mounted on the slide plate (302), and a mounting block (306) is fixedly mounted on the output end of the electric push rod (305). The welding machine (105) is fixedly mounted on the mounting block (306), and the controller (106) is fixedly mounted on the side wall of the mounting block (306) away from the welding machine (105). A slide rod (401) is slidably mounted on the fixed rod (202). A second spring (402) is installed between the slide rod (401) and the fixed rod (202). A magnet (403) is fixedly mounted on the slide rod (401). An electromagnet (404) is fixedly mounted on the fixed rod (202). The electromagnet (404) is electrically connected to the electric push rod (305). Fixing holes (405) that cooperate with the slide rod (401) are evenly opened inside the sleeve (201). The fixed rod (202) and the sleeve (201) are in a sliding and sealed fit. The clamping plate (204) has a cavity (406) with evenly distributed air holes. A first air tube (407) is inserted into the cavity (406). The sliding rod (401) has a connecting groove (408) and the fixed rod (202) has a hole (409) communicating with the connecting groove (408). The sliding rod (401) and the fixed rod (202) are in a sliding and sealed fit. A spring telescopic rod (501) is fixedly installed on the mounting block (306). A third arc plate (502) is fixedly installed on the output end of the spring telescopic rod (501). Ball bearings (503) are evenly fixedly installed on the third arc plate (502). A position sensor (504) electrically connected to the controller (106) is fixedly installed inside the spring telescopic rod (501). Limiting rods (505) are symmetrically fixedly installed on the mounting plate (104). A guide plate (506) is slidably installed on the limiting rod (505). A third spring (507) is installed between the guide plate (506) and the mounting plate (104). A limiting plate (508) is detachably installed on the guide plate (506). A connecting rope (509) is fixedly installed on the guide plate (506). One end of the connecting rope (509) away from the guide plate (506) is fixedly connected to the mounting block (306).

2. The pipe welding apparatus for shipbuilding according to claim 1, characterized in that: The mounting plate (104) is rotatably mounted with a guide wheel (510) that cooperates with the connecting rope (509).

3. The pipe welding apparatus for shipbuilding according to claim 1, characterized in that: The purification assembly includes a filter box (601) fixedly installed on a first arc plate (101), an air pump (602) fixedly installed on the filter box (601), and an air inlet pipe (603) fixedly installed on the filter box (601) extending into the first arc plate (101).

4. The pipe welding apparatus for shipbuilding according to claim 1, characterized in that: A sealing gasket (604) is fixedly installed on the clamping plate (204).

5. A pipe welding apparatus for shipbuilding according to claim 1, characterized in that: An exhaust valve (605) with its output end connected to the outside is fixedly installed on the sleeve (201).

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