A manufacturing process for corrosion-resistant submarine 3D pipe segments and a welding tooling

Abstract

The present invention belongs to the technical field of pipe segment manufacturing, and specifically relates to a corrosion-resistant undersea 3D pipe segment manufacturing process and welding tooling, including incoming material inspection, part processing, alignment, welding, post-weld non-destructive testing, and finishing. By gradually moving the cooling cotton, a relatively gentle temperature gradient is formed in the weld area, enabling the weld to cool more evenly. This helps reduce the thermal stress and residual stress generated by rapid cooling, thereby reducing the change in the pipe length tolerance caused by stress. Secondly, by moving the triangular prism along the electric guide rail, the impurities attached to the cooling cotton can be scraped off, thus preventing these impurities from damaging the outer wall of the pipe during movement, and further improving the service life of the pipe. In addition, by using a water delivery pipe to replenish the water in the storage tank back into the piston cylinder, the moisture on the cooling cotton on the inner ring surface of the arc-shaped plate can be replenished, thereby improving the continuity of production work.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe section manufacturing, and more specifically, to a corrosion-resistant submarine 3D pipe section manufacturing process and welding tooling. Background Art

[0002] The corrosion-resistant submarine 3D pipe section manufacturing welding tooling is a welding auxiliary device designed specifically for submarine pipeline manufacturing. It adopts advanced tooling design concepts and combines the use of corrosion-resistant materials to ensure the long-term stability and corrosion resistance of pipe sections in harsh environments such as the seabed. This tooling not only has high-precision positioning and adjustment functions to achieve the precise manufacturing of 3D pipe sections, but also is equipped with an efficient welding system, which can ensure that the welding quality and strength meet the usage requirements of submarine pipelines.

[0003] In the prior art, it usually involves precisely positioning and fixing pipe sections made of corrosion-resistant materials on the tooling, and performing precise welding operations on land or underwater through high-precision welding equipment to ensure the weld quality and the corrosion resistance of the pipe sections, and finally assembling them into a 3D pipe section structure that meets the requirements. The entire process requires strict control of welding parameters and environmental factors to ensure the quality and performance of the pipe sections.

[0004] The above solutions still have some problems in practical applications. Although the prior art can complete the prefabrication welding of bent pipes, after welding is completed, since the weld area has experienced high-temperature heating and its temperature is much higher than the surrounding non-welded area, it will then cool down. Due to the fast cooling speed, the shrinkage amount of the weld and its nearby area is relatively large, while the shrinkage of the surrounding area is relatively small. This uneven shrinkage will generate additional tensile or compressive forces in the pipeline length direction, making it difficult to control the pipeline length within the designed length tolerance range, thereby increasing the complexity and time cost of subsequent installation work. Secondly, the moving cooling mechanism will closely adhere to the outer ring surface of the pipeline during movement and will carry away impurities on the outer ring surface of a group of pipelines while moving. When working on the next group of pipelines, these impurities will cause damage to the outer wall of the pipeline during movement, thereby reducing the service life of the pipeline.

[0005] Therefore, the present invention provides a corrosion-resistant submarine 3D pipe section manufacturing process and welding tooling. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A corrosion-resistant submarine 3D pipe section manufacturing process and welding tooling of the present invention includes incoming material inspection, part processing, alignment, welding, post-weld non-destructive testing, and finishing. It is characterized in that the welding includes the following steps:

[0008] Step 1: Place two groups of bent pipes on the working platform and fix them with a fixing tooling.

[0009] Step 2: After welding is completed, start the electric telescopic rod to pull the trapezoidal block at its bottom upward, so as to drive the cooling cotton with water on the sides of the two arc-shaped plates to fit the outer ring surface of the bent pipe.

[0010] Step 3: Start the motor to drive the two first displacement blocks to perform relative linear motion, and during the motion, cool the outer ring surface of the pipe through the cooling cotton.

[0011] Step 4: After the cooling work is completed, the two first displacement blocks will perform linear motion towards each other, and during the motion, they will contact the triangular prism block, and the impurities attached to the cooling cotton will be scraped off through the displacement of the triangular prism block.

[0012] Step 5: After the scraping work is completed, the two first displacement blocks will continue to move, and water will be supplied to the cooling cotton through the second water inlet hole, the first water inlet hole and the rigid pipe.

[0013] As a further solution of the present invention: In Step 2, after the welding work of the pipe is completed, the outer ring surface of the pipe away from the weld will be clamped by starting the electric telescopic rod.

[0014] As a further solution of the present invention: Start the electric telescopic rod to move upward to drive the trapezoidal block and the guiding block to move synchronously, and through the guiding block and the grooves on the second displacement block, drive the two arc-shaped plates to approach the middle. When the opposite sides of the two arc-shaped plates fit, the cooling cotton will contact the outer ring surface of the pipe.

[0015] As a further solution of the present invention: In Step 3, after the two arc-shaped plates are closed, start the motor to drive the bidirectional screw to rotate, and while rotating, drive the two first displacement blocks to move synchronously, and through the limit of the guiding column, the two first displacement blocks can perform relative linear motion.

[0016] As a further solution of the present invention: When the two first displacement blocks perform relative linear motion, they will synchronously drive the two arc-shaped plates to perform linear motion, and while moving, cool the outer ring surface of the pipe through the cooling cotton on the inner ring surface of the arc-shaped plate.

[0017] As a further solution of the present invention: In Step 4, after the cooling work is completed, the two arc-shaped plates will gradually expand outward while moving through the downward movement of the electric telescopic rod until the second water inlet hole is aligned with the first water inlet hole, and then the two arc-shaped plates will stop moving, reserving sufficient space for subsequent work.

[0018] As a further solution of the present invention: when the two arc-shaped plates are fully expanded, the electric guide rail will be activated, and the sliding block will drive the triangular prism block to move synchronously along the guidance of the electric guide rail, and scrape off the impurities adhering to the cooling cotton during the movement.

[0019] As a further solution of the present invention: in step five, the continuous reverse rotation of the motor can drive the first displacement block to continue to move in a straight line towards each other, and during the movement, the rigid pipe is inserted into the first water inlet hole through the second water inlet hole.

[0020] As a further solution of the present invention: the blocking by the blocking piece can block the continuous movement of the second displacement block towards each other, so that the water in the piston cylinder can be replenished into the arc-shaped plate, and the water gradually penetrates into the cooling cotton on the inner ring surface of the arc-shaped plate through the water outlet hole. When the side of the blocking piece is not blocked, the reciprocating spring will reset, and at the same time, it will replenish the water stored in the water storage tank back into the piston cylinder through the water delivery pipe.

[0021] First, place the pre-treated bent pipe on the fixing tooling, and press the two sides of the two bent pipes that need to be welded. At this time, fix the upper and lower parts of the fixing tooling with screws to fix the bent pipe, and start the welding component to weld the opposite sides of the two bent pipes.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. When the two first displacement blocks move in a straight line relative to each other in the present invention, they will drive the two arc-shaped plates to move synchronously through the two second displacement blocks. Since the cooling cotton fixed on the inner ring surface of the arc-shaped plate contains water, during the straight-line movement, the arc-shaped plate cools the pipeline on the path. At the same time, since the temperature on the pipeline gradually decreases from the weld area to both ends, when the two arc-shaped plates approach the weld area synchronously, the cooling cotton on their inner ring surfaces will gradually heat up. And due to the gradual movement of the cooling cotton, a relatively gentle temperature gradient will be formed in the weld area, enabling the weld to cool more evenly, which helps to reduce the thermal stress and residual stress generated by rapid cooling, thereby reducing the change in the pipeline length tolerance caused by stress, and further reducing the complexity and time cost of subsequent installation work;

[0024] 2. When the mobile cooling mechanism of the present invention finishes cooling the weld area, the motor rotates reversely. While rotating, it drives two first displacement blocks to move linearly towards each other through a bidirectional screw. While moving, it drives two arc-shaped plates to move synchronously. While moving, the electric telescopic rod stretches downward and drives the trapezoidal block at its bottom to move synchronously. At this time, the two second displacement blocks are pushed by the trapezoidal block and restricted by the convex blocks and guide grooves on their sides, and will move to both sides. When the tops of the second displacement blocks and the trapezoidal block are on the same horizontal plane, the electric telescopic rod stops moving. At this time, the two arc-shaped plates are in an outward-expanded state, and the second water inlet hole is aligned with the first water inlet hole. When the arc-shaped plate contacts the triangular prism block, the motor stops moving. At this time, the electric guide rail fixedly connected to the lower part of the fixed tooling is started. When the electric guide rail is started, it drives the sliding block sliding inside it to move along the guide of the electric guide rail, and then can drive the triangular prism block fixed on the sliding block to move synchronously. Since the curvature of the electric guide rail is the same as that of the arc-shaped plate, when the triangular prism block moves along the electric guide rail, the impurities attached to the cooling cotton can be scraped off, thus avoiding damage to the outer wall of the pipeline during the movement of these impurities when working on the next group of pipelines, and further improving the service life of the pipeline.

[0025] 3. The present invention transmits water to the cooling cotton through the water outlet holes opened on the inner ring surface of the arc-shaped plate. When the two first displacement blocks move again, the protective shell and the blocking piece gradually separate. At this time, the reciprocating spring gradually resets, and the water inside the water storage tank is replenished into the piston cylinder again through the water delivery pipe, so as to replenish the water on the cooling cotton on the inner ring surface of the arc-shaped plate, and further improve the continuity of the production work. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the drawings.

[0027] Figure 1 is the overall structural schematic diagram of the present invention;

[0028] Figure 2 is the positional structural schematic diagram of the welding equipment and the mobile cooling mechanism in the present invention;

[0029] Figure 3 is the three-dimensional structural schematic diagram of the mobile cooling mechanism in the present invention;

[0030] Figure 4 is the internal structural schematic diagram of the protective shell in the present invention;

[0031] Figure 5 is in the present invention Figure 4 the enlarged structural schematic diagram at position A in;

[0032] Figure 6in the present invention Figure 4 Schematic enlarged structure diagram at position B in

[0033] Figure 7 Schematic structure diagram of the positions of the first water inlet hole and the second water inlet hole in the present invention;

[0034] Figure 8 Schematic internal structure diagram of the piston cylinder in the present invention;

[0035] Figure 9 Schematic three-dimensional structure diagram of the displacement scraping mechanism in the present invention.

[0036] In the figure: 1. Welding equipment; 101. Working platform; 102. Fixing tooling;

[0037] 2. Mobile cooling mechanism; 201. Motor; 202. Bidirectional screw; 203. First displacement block; 204. Guide post; 205. Protective shell; 206. Trapezoidal block; 207. Guide block; 208. Second displacement block; 209. Guide groove; 210. Arc plate; 211. First water inlet hole; 212. Water outlet hole; 213. Water storage tank; 214. Water delivery pipe; 215. Piston cylinder; 216. Piston piece; 217. Reciprocating spring; 218. Piston rod; 219. Rigid pipe; 220. Blocking piece; 221. Second water inlet hole; 222. Electric telescopic rod;

[0038] 3. Displacement scraping mechanism; 301. Electric guide rail; 302. Sliding block; 303. Triangular prism block. Detailed implementation manners

[0039] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners. Embodiment 1

[0040] As Figures 1 to 9 shown, a corrosion-resistant submarine 3D pipe section manufacturing process according to an embodiment of the present invention includes incoming material inspection, part processing, alignment, welding, post-weld non-destructive inspection and finish machining, and is characterized in that the welding includes the following steps:

[0041] Step 1: Place two groups of bent pipes on the working platform 101 and fix them through the fixing tooling 102;

[0042] Step 2: After welding is completed, start the electric telescopic rod 222 to pull the trapezoidal block 206 at its bottom upward, so as to drive the cooling cotton with water on the sides of the two arc plates 210 to fit the outer ring surface of the bent pipe;

[0043] Step 3: Drive the two groups of first displacement blocks 203 to perform relative linear motion by starting the motor 201, and cool the outer ring surface of the pipeline through the cooling cotton during the motion;

[0044] Step 4: When the cooling work is completed, the two groups of first displacement blocks 203 will perform linear motion towards each other, and during the motion, they will contact the triangular prism block 303, and scrape off the impurities attached to the cooling cotton through the displacement of the triangular prism block 303;

[0045] Step 5: When the scraping work is completed, the two groups of first displacement blocks 203 will continue to move, and supplement water to the cooling cotton through the second water inlet hole 221, the first water inlet hole 211 and the rigid pipe 219. Embodiment 2

[0046] As Figures 2 to 9 shown, compared with Embodiment 1, another implementation manner of the present invention is:

[0047] As Figure 4 shown, in Step 2 of this embodiment, after the pipeline completes the welding work, the outer ring surface of the pipeline away from the weld will be clamped by starting the electric telescopic rod 222.

[0048] As Figure 4 shown, in this embodiment, starting the upward movement of the electric telescopic rod 222 drives the trapezoidal block 206 and the guide block 207 to move synchronously, and through the guide block 207 and the grooves on the second displacement block 208, drives the two arc-shaped plates 210 to approach the middle. When the opposite sides of the two arc-shaped plates 210 are in contact, the cooling cotton will contact the outer ring surface of the pipeline.

[0049] Specifically, after the pipeline placed on the welding device 1 is welded, start the electric telescopic rod 222 inside the first displacement block 203. At this time, the output end of the electric telescopic rod 222 will move upward, and while moving, drive the trapezoidal block 206 on its bottom surface to move synchronously. Synchronously, drive the guide blocks 207 fixed on the inclined surfaces on both sides of the trapezoidal block 206 to move synchronously. Since the top of the second displacement block 208 abuts against the inclined surface of the trapezoidal block 206, and the guide block 207 slides in the groove on the top of the second displacement block 208, when the trapezoidal block 206 moves upward, the groove on the top of the second displacement block 208 will synchronously pull the second displacement block 208 to move synchronously to adapt to the movement of the guide block 207. At the same time, since convex blocks are provided on both sides of the second displacement block 208, and the convex blocks slide in the guide grooves 209 opened on the inner side of the protective shell 205, when the electric telescopic rod 222 moves upward, it will drive the two second displacement blocks 208 to move synchronously towards the middle, and thus be able to drive the two arc-shaped plates 210 to move towards the middle.

[0050] When the opposite sides of the two arc-shaped plates 210 come into contact with each other, the cooling cotton fixed on the inner ring surface of the arc-shaped plate 210 will fit against the outer ring surface of the pipeline. At this time, the two groups of arc-shaped plates 210 are respectively located on both sides of the pipeline away from the weld.

[0051] As Figure 3 shown, in step three of this embodiment, after the two groups of arc-shaped plates 210 complete the closing work, the motor 201 is started to drive the bidirectional screw 202 to rotate. While rotating, it will drive the two first displacement blocks 203 to move synchronously, and through the limit of the guide post 204, the two first displacement blocks 203 can perform relative linear motion.

[0052] As Figure 3 and Figure 4 shown, when the two first displacement blocks 203 perform relative linear motion in this embodiment, they will synchronously drive the two arc-shaped plates 210 to perform linear motion, and while moving, the cooling cotton on the inner ring surface of the arc-shaped plate 210 will cool the outer ring surface of the pipeline.

[0053] Specifically, when the cooling cotton on the inner ring surfaces of the two groups of arc-shaped plates 210 is in contact with the outer ring surface of the pipeline, the motor 201 fixed on the side of the fixing tooling 102 is started. At this time, the output shaft of the motor 201 will drive the bidirectional screw 202 to rotate, and while rotating, it will drive the two first displacement blocks 203 on its outer ring surface to move synchronously. Since the two first displacement blocks 203 are both sliding on the outer ring surface of the guide post 204 fixed on the side of the fixing tooling 102, and the two first displacement blocks 203 are respectively located at both ends of the bidirectional screw 202, when the motor 201 is started, it will synchronously drive the two first displacement blocks 203 to perform relative linear motion.

[0054] When the two first displacement blocks 203 perform relative linear motion, they will synchronously drive the two arc-shaped plates 210 to move through the two second displacement blocks 208. Since the cooling cotton fixed on the inner ring surface of the arc-shaped plate 210 contains water, during the linear motion, the arc-shaped plate 210 cools the pipeline on the path. At the same time, since the temperature on the pipeline gradually decreases from the weld area to both ends, when the two arc-shaped plates 210 approach the weld area synchronously, the cooling cotton on their inner ring surfaces will gradually heat up. And because of the gradual movement of the cooling cotton, a relatively gentle temperature gradient will be formed in the weld area, enabling the weld to cool more evenly, which helps to reduce the thermal stress and residual stress generated by rapid cooling, thereby reducing the change in the pipeline length tolerance caused by stress, and further reducing the complexity and time cost of subsequent installation work.

[0055] As Figure 4 and Figure 7As shown in the figure, in step four of this embodiment, after the cooling operation is completed, since the second water inlet hole 221 and the first water inlet hole 211 are on the same horizontal plane, when the two arc-shaped plates 210 move, they will gradually expand outward through the downward movement of the electric telescopic rod 222. When the second water inlet hole 221 is aligned with the first water inlet hole 211, the two arc-shaped plates 210 will stop moving, reserving sufficient space for subsequent work.

[0056] As Figure 9 shown in the figure, when the two arc-shaped plates 210 of this embodiment complete the outward expansion, the electric guide rail 301 will start, and will drive the triangular prism 303 to move synchronously along the guide of the electric guide rail 301 through the slider 302, and scrape the impurities attached to the cooling cotton during the movement.

[0057] Specifically, when the mobile cooling mechanism 2 completes the cooling work on the weld area, the motor 201 will rotate reversely, and at the same time drive the two first displacement blocks 203 to move in a straight line towards each other through the bidirectional screw rod 202 during the rotation. At the same time, it will drive the two arc-shaped plates 210 to move synchronously. During the movement, the electric telescopic rod 222 will stretch downward, and at the same time drive the trapezoidal block 206 at its bottom to move synchronously. At this time, the two second displacement blocks 208 will be pushed by the trapezoidal block 206 and restricted by the convex blocks and guide grooves 209 on their sides, and will move to both sides. When the top of the second displacement block 208 is at the same horizontal plane as the top of the trapezoidal block 206, the electric telescopic rod 222 will stop moving. At this time, the two arc-shaped plates 210 are in the outward expansion state while the second water inlet hole 221 and the first water inlet hole 211 are aligned. When the arc-shaped plate 210 contacts the triangular prism 303, the motor 201 will stop moving. At this time, the electric guide rail 301 fixedly connected to the lower part of the fixed tooling 102 is started. When the electric guide rail 301 is started, it will drive the slider 302 sliding inside it to move along the guide of the electric guide rail 301, and then be able to drive the triangular prism 303 fixed on the slider 302 to move synchronously. Since the curvature of the electric guide rail 301 is the same as that of the arc-shaped plate 210, when the triangular prism 303 moves along the electric guide rail 301, the impurities attached to the cooling cotton can be scraped off, thus avoiding damage to the outer wall of the pipeline caused by these impurities during the movement when working on the next group of pipelines, and then improving the service life of the pipeline.

[0058] As Figure 7 and Figure 8 shown in the figure, in step five of this embodiment, continuous reverse rotation of the motor 201 can drive the first displacement block 203 to continue to move in a straight line towards each other, and during the movement, the rigid pipe 219 is inserted into the first water inlet hole 211 through the second water inlet hole 221.

[0059] AsFigure 8 and Figure 5 As shown, in this embodiment, the blocking piece 220 can block when the second displacement block 208 continues to move towards each other, so that the water in the piston cylinder 215 can be supplemented into the arc plate 210, and the water gradually penetrates into the cooling cotton on the inner ring surface of the arc plate 210 through the water outlet hole 212.

[0060] When the side of the blocking piece 220 is not blocked, the reciprocating spring 217 will reset, and at the same time of resetting, it will supplement the water stored in the water storage tank 213 back into the piston cylinder 215 through the water delivery pipe 214.

[0061] Specifically, when the displacement scraping mechanism 3 finishes working, the motor 201 will continue to rotate reversely, driving the two first displacement blocks 203 to perform continuous linear motion towards each other. Since the rigid pipe 219 is on the same horizontal plane as the second water inlet hole 221 and the first water inlet hole 211, and the diameters of the second water inlet hole 221 and the first water inlet hole 211 are larger than that of the rigid pipe 219, when moving, the rigid pipe 219 will insert into the first water inlet hole 211 through the second water inlet hole 221. At the same time, since the diameter of the blocking piece 220 is larger than that of the second water inlet hole 221, when the protective shell 205 moves, it will push the piston cylinder 215 to slide to the other side of the fixed tooling 102 through the blocking piece 220. At this time, since the piston rod 218 is fixed on the inner cavity side wall of the fixed tooling 102, and the two ends of the reciprocating spring 217 are respectively fixed to the opposite sides of the piston cylinder 215 and the piston piece 216, and at the same time, it is sleeved on the outer ring surface of the piston rod 218, when the piston cylinder 215 moves, the water in the piston cylinder 215 will be sprayed into the second displacement block 208 through the piston piece 216. At this time, the reciprocating spring 217 is in a stretched state, and at the same time, the water delivery pipe 214 is in a tensioned state. Since the second displacement block 208 is communicated with the arc plate 210 and the inside of the arc plate 210 is a cavity, the water sprayed from the piston cylinder 215 will flow into the arc plate 210, and at the same time, the water is transmitted to the cooling cotton through the water outlet hole 212 opened on the inner ring surface of the arc plate 210. When the two first displacement blocks 203 move again, the protective shell 205 and the blocking piece 220 will gradually separate. At this time, the reciprocating spring 217 will gradually reset, and the water delivery pipe 214 will gradually change from a tensioned state to a relaxed state, and the water in the water storage tank 213 will be replenished into the piston cylinder 215 again through the water delivery pipe 214, so as to supplement the water on the cooling cotton on the inner ring surface of the arc plate 210, and then improve the continuity of the production work.

[0062] Working principle: After the pipeline placed on the welding device 1 is welded, the electric telescopic rod 222 inside the first displacement block 203 is started. At this time, the output end of the electric telescopic rod 222 will move upward, and while moving, it will drive the trapezoidal block 206 on its bottom surface to move synchronously. Synchronously, it will drive the guide blocks 207 fixed on the inclined surfaces on both sides of the trapezoidal block 206 to move synchronously. Since the top of the second displacement block 208 abuts against the inclined surface of the trapezoidal block 206, and the guide block 207 slides in the groove on the top of the second displacement block 208, when the trapezoidal block 206 moves upward, the groove on the top of the second displacement block 208 will synchronously pull the second displacement block 208 to move synchronously to adapt to the movement of the guide block 207. At the same time, since convex blocks are provided on both sides of the second displacement block 208, and the convex blocks slide in the guide grooves 209 opened on the inner side of the protective shell 205, when the electric telescopic rod 222 moves upward, it will drive the two second displacement blocks 208 to move synchronously towards the middle, and then be able to drive the two arc-shaped plates 210 to move towards the middle.

[0063] When the opposite sides of the two arc-shaped plates 210 abut against each other, the cooling cotton fixed on the inner ring surface of the arc-shaped plate 210 will fit against the outer ring surface of the pipeline. At this time, the two groups of arc-shaped plates 210 are respectively located on both sides of the pipeline away from the weld.

[0064] When the cooling cotton on the inner ring surfaces of the two groups of arc-shaped plates 210 both fit against the outer ring surface of the pipeline, the motor 201 fixed on the side of the fixed tooling 102 is started. At this time, the output shaft of the motor 201 will drive the bidirectional screw rod 202 to rotate, and while rotating, it will drive the two first displacement blocks 203 on its outer ring surface to move synchronously. Since the two first displacement blocks 203 both slide on the outer ring surface of the guide posts 204 fixed on the side of the fixed tooling 102, and the two first displacement blocks 203 are respectively at both ends of the bidirectional screw rod 202, when the motor 201 is started, it will synchronously drive the two first displacement blocks 203 to perform relative linear motion.

[0065] When the two first displacement blocks 203 perform relative linear motion, they will synchronously drive the two arc-shaped plates 210 to move through the two second displacement blocks 208. Since the cooling cotton fixed on the inner ring surface of the arc-shaped plate 210 contains water, during the linear motion process, the arc-shaped plate 210 cools the pipeline on the path. At the same time, since the temperature on the pipeline gradually decreases from the weld area to both ends, when the two arc-shaped plates 210 move synchronously towards the weld area, the cooling cotton on their inner ring surfaces will gradually heat up. And due to the gradual movement of the cooling cotton, a relatively gentle temperature gradient will be formed in the weld area, enabling the weld to cool more evenly. This helps to reduce the thermal stress and residual stress generated by rapid cooling, thereby reducing the change in the pipeline length tolerance caused by stress, and further being able to reduce the complexity and time cost of subsequent installation work.

[0066] When the moving cooling mechanism 2 finishes cooling the weld area, the motor 201 will rotate in reverse. While rotating, it drives two first displacement blocks 203 to move linearly towards each other through the bidirectional screw 202. At the same time of the movement, it drives two arc-shaped plates 210 to move synchronously. While moving, the electric telescopic rod 222 will stretch downward and drive the trapezoidal block 206 at its bottom to move synchronously. At this time, the two second displacement blocks 208 will move to both sides under the thrust of the trapezoidal block 206 and the restriction of the convex blocks and guide grooves 209 on their sides. When the tops of the second displacement blocks 208 and the trapezoidal block 206 are at the same horizontal plane, the electric telescopic rod 222 will stop moving. At this time, the two arc-shaped plates 210 are in an outward-expanded state, and the second water inlet hole 221 and the first water inlet hole 211 will be aligned. When the arc-shaped plate 210 contacts the triangular prism block 303, the motor 201 will stop moving. At this time, the electric guide rail 301 fixedly connected to the lower part of the fixed tooling 102 is started. When the electric guide rail 301 is started, it drives the sliding block 302 sliding inside it to move along the guide of the electric guide rail 301, and then can drive the triangular prism block 303 fixed on the sliding block 302 to move synchronously. Since the radian of the electric guide rail 301 is the same as that of the arc-shaped plate 210, when the triangular prism block 303 moves along the electric guide rail 301, it can scrape off the impurities attached to the cooling cotton, thus avoiding damage to the outer wall of the pipeline caused by these impurities during the movement when working on the next group of pipelines, and then improving the service life of the pipeline.

[0067] When the displacement blade mechanism 3 finishes its work, the motor 201 will continue to rotate reversely and drive the two first displacement blocks 203 to perform continuous linear motion towards each other. Since the rigid pipe 219 is on the same horizontal plane as the second water inlet hole 221 and the first water inlet hole 211, and the diameters of the second water inlet hole 221 and the first water inlet hole 211 are larger than that of the rigid pipe 219, the rigid pipe 219 will be inserted into the first water inlet hole 211 through the second water inlet hole 221 during the movement. At the same time, since the diameter of the blocking piece 220 is larger than that of the second water inlet hole 221, when the protective shell 205 moves, it will push the piston cylinder 215 to slide towards the other side of the fixed tooling 102 through the blocking piece 220. At this time, since the piston rod 218 is fixed on the inner cavity side wall of the fixed tooling 102, and the two ends of the reciprocating spring 217 are respectively fixed to the opposite sides of the piston cylinder 215 and the piston piece 216, and is also sleeved on the outer ring surface of the piston rod 218, when the piston cylinder 215 moves, the water in the piston cylinder 215 will be sprayed into the second displacement block 208 through the piston piece 216. At this time, the reciprocating spring 217 is in a stretched state, and at the same time, the water delivery pipe 214 is in a tensioned state. Since the second displacement block 208 is communicated with the arc-shaped plate 210, and the inside of the arc-shaped plate 210 is a cavity, the water sprayed from the piston cylinder 215 will flow into the arc-shaped plate 210, and at the same time, the water is transmitted to the cooling cotton through the water outlet holes 212 opened on the inner ring surface of the arc-shaped plate 210. When the two first displacement blocks 203 move again, the protective shell 205 and the blocking piece 220 will gradually separate. At this time, the reciprocating spring 217 will gradually return to its original state, and the water delivery pipe 214 will gradually change from a tensioned state to a relaxed state, and the water inside the water storage tank 213 will be replenished into the piston cylinder 215 again through the water delivery pipe 214, so as to be able to replenish the water on the cooling cotton on the inner ring surface of the arc-shaped plate 210, and further improve the continuity of the production work.

[0068] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for corrosion-resistant submarine 3D pipe sections, including incoming material inspection, part processing, alignment, welding, non-destructive testing after welding, and finishing, characterized in that: Welding includes the following steps: Step 1: Place two groups of bent pipes on the working platform (101) and fix them with the fixing tooling (102); Step 2: After welding is completed, start the electric telescopic rod (222) to pull the trapezoidal block (206) at its bottom upward, and through the guiding blocks (207) on the inclined surfaces on both sides of the trapezoidal block (206), pull the second displacement block (208) to move synchronously. At the same time, since convex blocks are provided on both sides of the second displacement block (208) and the convex blocks slide in the guiding grooves (209) opened on the inner side of the protective shell (205), when the trapezoidal block (206) moves upward, the movement of the two second displacement blocks (208) can drive the cooling cotton with water on the sides of the two groups of arc-shaped plates (210) to fit the outer ring surface of the bent pipe. The guiding block (207) slides in the groove on the top of the second displacement block (208); Step 3: Start the motor (201) to drive the two first displacement blocks (203) to perform relative linear motion, and during the motion, cool the outer ring surface of the pipe through the cooling cotton. Each first displacement block (203) is internally provided with an electric telescopic rod (222); Step 4: After the cooling work is completed, the two first displacement blocks (203) perform reverse linear motion, and during the motion, they will contact the triangular prism block (303), and through the displacement of the triangular prism block (303), scrape the impurities attached to the cooling cotton. The triangular prism block (303) can move along the arc-shaped electric guide rail (301), and the electric guide rail (301) is arranged on the fixing tooling (102); Step 5: After the scraping work is completed, the two first displacement blocks (203) will continue to move, and supplement water to the cooling cotton through the second water inlet hole (221) on the protective shell (205), the first water inlet hole (211) on the second displacement block (208), and the rigid pipe (219). A blocking piece (220) is provided on the rigid pipe (219), the rigid pipe (219) is arranged on the fixing tooling (102), the rigid pipe (219) is connected to the piston cylinder (215), a piston rod (218) is arranged in the piston cylinder (215), the piston rod (218) is fixed in the inner cavity of the fixing tooling (102), a piston piece (216) is arranged at the end of the piston rod (218), and the two opposite sides of the piston cylinder (215) and the piston piece (216) are fixedly connected to the two ends of a reciprocating spring (217), and the reciprocating spring (217) is sleeved on the piston rod (218); When the two first displacement blocks (203) continue to move, since the diameter of the blocking piece (220) is greater than the diameter of the second water inlet hole (221), when the protective shell (205) moves, the blocking piece (220) pushes the piston cylinder (215) to slide, and further sprays the water in the piston cylinder (215) into the second displacement block (208) through the piston piece (216). At this time, the reciprocating spring (217) is in a stretched state. Since the second displacement block (208) is communicated with the arc-shaped plate (210) and the inside of the arc-shaped plate (210) is a cavity, the water sprayed from the piston cylinder (215) will flow into the arc-shaped plate (210), and at the same time, the water is transmitted to the cooling cotton through the water outlet holes (212) formed on the inner ring surface of the arc-shaped plate (210).

2. The manufacturing process of a corrosion-resistant submarine 3D pipe section according to claim 1, characterized in that: In step two, after the pipeline welding work is completed, the electric telescopic rod (222) is started to clamp the outer ring surface of the pipeline away from the weld seam.

3. The manufacturing process of a corrosion-resistant submarine 3D pipe section according to claim 1, characterized in that: In step three, the motor (201) is started to drive the bidirectional screw rod (202) to rotate. While rotating, it will drive the two first displacement blocks (203) to move synchronously, and the two first displacement blocks (203) can perform relative linear motion under the limitation of the guide posts (204).

4. A manufacturing process for a corrosion-resistant undersea 3D pipe section according to claim 1, characterized in that: In step four, after the cooling work is completed, while moving, the two arc-shaped plates (210) will gradually expand outward through the downward movement of the electric telescopic rod (222). When the second water inlet hole (221) is aligned with the first water inlet hole (211), the two arc-shaped plates (210) will stop moving.

5. The manufacturing process of a corrosion-resistant undersea 3D pipe section according to claim 4, characterized in that: When the two arc-shaped plates (210) complete the outward expansion, the electric guide rail (301) will be started, and it will drive the triangular prism block (303) to move along the guide of the electric guide rail (301) through the sliding block (302), and scrape the impurities attached to the cooling cotton during the movement.

6. The manufacturing process of a corrosion-resistant undersea 3D pipe section according to claim 1, characterized in that: In step five, the continuous reverse rotation of the motor (201) can drive the first displacement block (203) to continue to perform reverse linear motion, and during the movement, the rigid pipe (219) is inserted into the first water inlet hole (211) through the second water inlet hole (221).

7. A corrosion-resistant underwater 3D pipe section manufacturing and welding tooling, which is applied to the corrosion-resistant underwater 3D pipe section manufacturing process described in any one of claims 1-6, and is characterized in that: It includes a welding device (1), and the welding device (1) includes a working platform (101). Two fixing jigs (102) are fixedly connected to the top of the working platform (101), and both of the two fixing jigs (102) are used for fixing the bent pipe.

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