A welding pull-out device for straight seam submerged arc welded steel pipes

Abstract

This invention discloses a welding and drawing device for straight seam submerged arc welded steel pipes, relating to the field of welding and drawing technology. It includes a frame, comprising a base and welding units on the base, and further includes a drive assembly and an adjustment assembly disposed within the base. A straight plate moves outward, driving an arc-shaped plate to move, causing rollers to gradually approach and closely contact the inner wall of the steel pipe, providing stable support from within. This ensures the steel pipe is level during welding, avoids uneven weld heights, improves welding quality, and makes the weld more uniform and aesthetically pleasing. It also enhances the structural strength and stability of the welded steel pipe, providing reliable assurance for subsequent use. Furthermore, as the steel pipe moves forward, the rollers rotate smoothly around the outer periphery of the fixed column, providing stable support for the steel pipe without obstructing its movement, ensuring continuous and efficient welding, and improving production efficiency. By controlling the rotation angle of the arc-shaped plate, it can effectively support steel pipes of different sizes within a certain range, ensuring welding stability.

Description

Technical Field

[0001] This invention relates to the field of welding and drawing technology, and in particular to a welding and drawing device for straight seam submerged arc welded steel pipes. Background Technology

[0002] The core welding process used in the production of straight seam submerged arc welded steel pipes is submerged arc welding technology. This technology falls under the category of filler welding, where granular protective flux is used for submerged arc treatment during welding. Specifically, the production of straight seam submerged arc welded steel pipes begins with a preliminary forming process of the steel plate, where a flat steel plate is rolled into a steel pipe shape that meets the requirements. After this step, the crucial welding process begins, where submerged arc welding technology is used to weld the joint formed after the steel plate is rolled. Through this series of processes, straight seam submerged arc welded steel pipes that meet the specifications and standards are finally obtained.

[0003] There are two different operating methods available for welding steel pipe joints. One method involves moving the submerged arc welding (SAW) equipment to precisely weld the joint. This method allows for flexible adjustment of the welding position to adapt to different welding requirements. The other method involves keeping the SAW equipment stationary and using a pulling device to move the steel pipe, ensuring the joint passes sequentially through the stationary SAW equipment to complete the welding operation. Each method has its advantages, and the appropriate method should be selected based on specific production conditions, equipment status, and welding requirements.

[0004] However, existing technologies have a significant limitation when performing steel pipe welding operations: the joint of the steel pipe must be positioned directly above the weld seam. If the joint is not positioned directly above the weld seam, welding cannot be carried out smoothly. Moreover, this strict requirement for the joint position greatly increases the difficulty of ensuring welding accuracy, causing certain inconveniences to the production process. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that in the prior art, it is necessary to ensure that the joint of the steel pipe is directly above the weld before welding the steel pipe, otherwise it is impossible to weld the steel pipe and it is difficult to ensure the accuracy of the welding. Therefore, a welding pull-out device for straight seam submerged arc welded steel pipe is proposed.

[0006] To achieve the above objectives, the present invention employs the following technology: a welding pull-out device for straight seam submerged arc welded steel pipes, comprising a frame, the frame including a base frame and welding units on the base frame, and further comprising: a drive assembly and an adjustment assembly disposed within the base frame; The drive assembly includes a connecting cylinder fixed inside the base frame, and a transmission component is connected inside the connecting cylinder; The adjustment assembly includes embedded grooves on both sides of the connecting cylinder. The embedded grooves are connected to the connecting plate through an embedded plate that rotates on the inner wall. The connecting plate has an open groove and a straight groove inside. A limiting groove is opened through the side of the connecting plate. One end of the transmission component extends into the open groove and is connected to a fan-shaped plate. A straight plate is slidably connected to the inner wall of the straight groove. An arc-shaped plate extending out of the straight groove is fixed to the top of the straight plate. A limiting post that contacts the limiting groove is fixed to one side of the arc-shaped plate. The bottom end of the straight plate contacts the fan-shaped plate. The rotation of the transmission component drives the sector plate to rotate, and the rotation of the sector plate pushes the straight plate to slide outward, pushing the arc plate to contact the inner wall of the steel pipe.

[0007] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The arc-shaped plate has several grooves inside, and the inner wall of the groove is fixed with a fixing column. Rollers that rotate around the outer circumference of the fixing column are in contact with the inner wall of the steel pipe.

[0008] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The bottom of the straight plate is provided with an arc corner, and a spring is connected between the limiting post and the limiting groove.

[0009] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The connecting cylinder has a symmetrical inner cavity, and a contact plate that slides on the inner wall of the inner cavity to contact the joint of the steel pipe. A telescopic spring is connected between the contact plate and the inner cavity. A contact rod is fixed on one side of the contact plate, and a pressure sensor that contacts the contact rod is installed on the inner wall of the inner cavity.

[0010] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The contact plate has inclined surfaces on both sides that contact the joint of the steel pipe.

[0011] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The connecting plate has an internal clearance groove, and the outer periphery of the transmission component is provided with a snap-fit ​​block. The inner wall of the clearance groove is fixed with a fixing frame, and the inner walls of the fixing frame are fixed with positioning columns. The outer periphery of the positioning column is rotatably connected with a contact block that contacts the snap-fit ​​block. The inner wall of the clearance groove is equipped with a snap-fit ​​block that contacts the contact block and a spring sheet.

[0012] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The transmission component includes a fixed plate fixed inside the connecting cylinder. A servo motor is mounted on the top of the fixed plate. The output end of the servo motor passes through the fixed plate and is connected to the main bevel gear. An installation plate is fixed inside the connecting cylinder. A rotating rod is rotatably connected inside the installation plate. One end of the rotating rod extends out of the installation plate and is connected to a secondary bevel gear. An electric push rod is connected between the secondary bevel gear and the rotating rod. The secondary bevel gear is meshed with the main bevel gear. A vent is provided on the outer periphery of the installation plate.

[0013] A further description of a welding pull-out device for straight seam submerged arc welded steel pipes according to the above-mentioned technology: The frame also includes a push unit located at the bottom of the base frame and a control cabinet on one side of the base frame.

[0014] In summary, due to the adoption of the above-mentioned technology in the welding pull-out device for straight seam submerged arc welded steel pipes, the beneficial effects of this invention are: Before welding the steel pipe, the steel pipe is securely placed on the pushing unit by the set drive and adjustment components. The pushing unit is then started, and the steel pipe moves along the outer circumference of the connecting cylinder. At the same time, the servo motor is started synchronously at the moment the steel pipe moves, driving the main bevel gear to rotate forward, which in turn drives the two side bevel gears to rotate. The side bevel gears drive the rotating rod to rotate in the mounting plate, and the rotating rod drives the sector plate to rotate in the slot. The straight plate moves outward along the arc surface of the sector plate, and the limiting column on it moves synchronously in the limiting slot. The tension spring generates tension, and the outward movement of the straight plate drives the arc plate to move, so that the roller gradually approaches and closely contacts the inner wall of the steel pipe, providing stable support for the steel pipe from the inside. This ensures that the steel pipe is horizontal during welding, avoids uneven welds, improves welding quality, makes the weld more uniform and beautiful, enhances the structural strength and stability of the steel pipe after welding, and provides reliable protection for subsequent use. Furthermore, as the steel pipe moves forward, the rollers rotate smoothly around the fixed column, providing stable support for the steel pipe without hindering its movement, ensuring a continuous and efficient welding process, and improving production efficiency. As the rotating rod continues to rotate, when the straight plate moves to the highest point of the arc surface of the sector plate and is about to descend, the spring pulls the limiting column, causing the straight plate to descend along the arc. By controlling the rotation angle of the sector plate, it can effectively support steel pipes of different sizes within a certain range, ensuring welding stability. After the rollers stabilize the steel pipe, the steel pipe moves smoothly. The middle joint contacts the contact plate. As it moves, it contacts the inclined surface and generates a component force in the direction of the inner cavity, pushing the contact plate inward. This compresses the telescopic spring and generates elastic force. At the same time, the contact rod compresses the pressure sensor. The pressure sensor detects the pressure in real time and accurately. If the pressure on both sides is different, it indicates that the joint is not in the center position and needs to be adjusted. When the pressure on one side is too large, the electric push rod in the opposite direction is contracted to disengage the secondary bevel gear from the main bevel gear. Then, the servo motor drives the main bevel gear to rotate in the opposite direction, driving the secondary bevel gear to rotate in the same direction, which in turn drives the rotating rod to rotate. The locking block on the rotating rod rotates. Because the contact block is restricted by the locking block, it cannot rotate. The locking block exerts a force on the contact block, which is transmitted to the connecting plate through the fixing frame, causing it to rotate. The inner plate rotates in the inner groove. During this process, the fan-shaped plate and the straight plate remain fixed to ensure the stability of the support structure. The rotation of the connecting plate causes the rollers to generate a rotational torque under friction, which in turn drives the steel pipe to rotate slowly, changing the position of the joint. A pressure sensor continuously monitors pressure changes. When the pressure on both sides is equal, the joint is centered and horizontal, providing optimal conditions for welding. Welding at this point ensures a uniform and aesthetically pleasing weld, significantly improving weld quality. Precise adjustment of the joint position avoids welding defects, enhances the structural strength and stability of the welded steel pipe, extends its service life, and provides reliable assurance for subsequent use. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure according to the present invention is shown; Figure 2 A schematic diagram of the overall structure from another perspective according to the present invention is shown; Figure 3 A schematic diagram of the connecting cylinder structure according to the present invention is shown; Figure 4 A schematic diagram of the drive component structure according to the present invention is shown; Figure 5 A schematic diagram of the adjustment component structure according to the present invention is shown; Figure 6 A schematic diagram of the connecting plate structure according to the present invention is shown; Figure 7 A schematic diagram of the straight plate structure according to the present invention is shown; Figure 8 A schematic diagram of the contact plate structure according to the present invention is shown; Figure 9 A schematic diagram of the snap-fit ​​block structure according to the present invention is shown.

[0016] Legend: 10. Frame; 11. Base frame; 12. Control cabinet; 13. Welding unit; 14. Pushing unit; 20. Drive assembly; 21. Connecting cylinder; 22. Fixing plate; 23. Servo motor; 231. Main bevel gear; 232. Secondary bevel gear; 233. Rotating rod; 234. Mounting plate; 235. Vent; 30. Adjustment component; 31. Embedded groove; 311. Embedded plate; 32. Connecting plate; 321. Slot; 322. Straight groove; 323. Restricting groove; 324. Clearance groove; 33. Fan-shaped plate; 34. Straight plate; 341. Arc-shaped plate; 342. Groove; 343. Fixing post; 344. Roller; 345. Restricting post; 35. Inner cavity; 351. Contact plate; 352. Inclined surface; 353. Contact rod; 354. Pressure sensor; 355. Telescopic spring; 36. Snap-fit ​​block; 361. Fixing frame; 362. Positioning post; 363. Contact block; 364. Snap-fit ​​block; 365. Spring sheet. Detailed Implementation

[0017] The following will describe, with reference to the accompanying drawings of the embodiments of the present invention, a welding drawing device for straight seam submerged arc welded steel pipes according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1-9 As shown, the present invention provides a welding pull-out device for straight seam submerged arc welded steel pipes: including a frame 10, the frame 10 including a base frame 11 and a welding unit 13 on the base frame 11, the frame 10 also includes an adjustable pushing unit 14 disposed at the bottom of the base frame 11 and a control cabinet 12 on one side of the base frame 11, and also includes a drive assembly 20 and an adjustment assembly 30 disposed in the base frame 11. like Figure 1 , Figure 3 , Figure 4 As shown, the drive assembly 20 includes a connecting cylinder 21 fixed inside the base frame 11. Pushing units 14 are provided on both sides of the connecting cylinder 21, and a transmission component is connected inside the connecting cylinder 21. The transmission component includes a fixing plate 22 fixed inside the connecting cylinder 21. A servo motor 23 is installed on the top of the fixing plate 22. The output end of the servo motor 23 passes through the fixing plate 22 and is connected to the main bevel gear 231. An mounting plate 234 is fixed inside the connecting cylinder 21. A rotating rod 233 is rotatably connected inside the mounting plate 234. One end of the rotating rod 233 extends out of the mounting plate 234 and is connected to a secondary bevel gear 232. An electric push rod is connected between the secondary bevel gear 232 and the rotating rod 233. The secondary bevel gear 232 is meshed with the main bevel gear 231. A vent 235 is opened on the outer periphery of the mounting plate 234. Before welding the steel pipe, the steel pipe to be welded must be placed securely on the pushing unit 14. Then, the pushing unit 14 is started. Under the pushing action, the steel pipe will move along the outer periphery of the connecting cylinder 21. At the same time, the servo motor 23 is started synchronously at the moment the steel pipe begins to move, so that the servo motor 23 drives the main bevel gear 231 to rotate in the forward direction. As the main bevel gear 231 rotates, it will further drive the secondary bevel gears 232 located on both sides of it. After being driven, the secondary bevel gears 232 will drive the rotating rod 233 connected to it to rotate inside the mounting plate 234.

[0019] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the adjusting assembly 30 includes recessed grooves 31 on both sides of the connecting cylinder 21. A connecting plate 32 is connected to the recessed grooves 31 via an inner wall-rotating recessed plate 311. The connecting plate 32 has an internal slot 321 and a straight groove 322. A limiting groove 323 is formed through the side of the connecting plate 32. One end of the rotating rod 233 extends into the slot 321 and is fixedly connected to a fan-shaped plate 33. A straight plate 34 is slidably connected to the inner wall of the straight groove 322. An extension is fixed to the top of the straight plate 34. An arc-shaped plate 341 exits the straight groove 322. A limiting post 345 that contacts the limiting groove 323 is fixed on one side of the arc-shaped plate 341. The bottom end of the straight plate 34 contacts the fan-shaped plate 33. Several grooves 342 are opened inside the arc-shaped plate 341. A fixing post 343 is fixed on the inner wall of the groove 342. A roller 344 that contacts the inner wall of the steel pipe rotates on the outer periphery of the fixing post 343. An arc corner is provided at the bottom of the straight plate 34. A spring is connected between the limiting post 345 and the limiting groove 323. As the rotating rod 233 begins to rotate, it synchronously drives the connected sector plate 33 to rotate within the slot 321. During the rotation of the sector plate 33, the straight plate 34, which is always in contact with the sector plate 33, will gradually move outward along the arc surface of the sector plate 33. This is because the arc surface design of the sector plate 33 causes the straight plate 34 to be subjected to an outward component force during the contact process, thereby pushing the straight plate 34 to move outward. When the straight plate 34 moves outward, it will drive the limiting post 345 fixed on it to move synchronously in the limiting groove 323. During the movement of the limiting post 345, it will stretch the spring installed in the limiting groove 323, causing the spring to undergo elastic deformation and generate a certain tension. At the same time, as the straight plate 34 moves outward, the arc plate 341 fixed on the straight plate 34 will also move. The movement of the arc plate 341 causes the roller 344 installed inside the arc plate 341 to gradually approach the inner wall of the steel pipe and eventually make close contact with the inner wall of the steel pipe. At this time, the rollers 344 on both sides of the connecting cylinder 21 act as two stable support points, providing strong support to the steel pipe from the inside. This support method can ensure that the steel pipe remains horizontal during the welding process, effectively avoiding uneven welds caused by the tilting of the steel pipe. This not only greatly improves the welding quality, making the weld more uniform and beautiful, but also enhances the structural strength and stability of the steel pipe after welding, providing a reliable guarantee for subsequent use. Moreover, as the steel pipe is pushed forward, the roller 344 supporting the steel pipe will rotate smoothly around the outer periphery of the fixed column 343. This rotational design of the roller 344 can provide stable support for the steel pipe without hindering its pushing. The steel pipe can move forward without any obstruction under the support of the roller 344, ensuring the continuity and efficiency of the entire welding process and greatly improving production efficiency. As the rotating rod 233 continues to rotate, when the straight plate 34 moves to the highest point of the arc surface of the sector plate 33 and is about to descend, the limiting column 345 will be pulled by the spring due to the elasticity of the spring. Under the action of this tension, the limiting column 345 will drive the straight plate 34 to descend continuously along the arc of the sector plate 33. By controlling the rotation angle of the sector plate 33, steel pipes of different sizes within a certain range can be effectively supported, ensuring the stable progress of the welding process.

[0020] like Figure 8 , Figure 9 As shown, the connecting cylinder 21 has a symmetrical inner cavity 35 inside, and the inner wall of the inner cavity 35 has a contact plate 351 that slides in contact with the steel pipe joint. A telescopic spring 355 is connected between the contact plate 351 and the inner cavity 35. A contact rod 353 is fixed on one side of the contact plate 351. A pressure sensor 354 that contacts the contact rod 353 is installed on the inner wall of the inner cavity 35. Inclined surfaces 352 that contact the steel pipe joint are opened on both sides of the contact plate 351. The connecting plate 32 has a clearance groove 324 inside, and a locking block 36 is fixed on the outer periphery of the rotating rod 233. A fixing frame 361 is fixed on the inner wall of the clearance groove 324, and a positioning column 362 is fixed between the inner walls of the fixing frame 361. A contact block 363 that contacts the locking block 36 is rotatably connected to the outer periphery of the positioning column 362. A locking block 364 that contacts the contact block 363 and a spring plate 365 are installed on the inner wall of the clearance groove 324. When the rotating rod 233 starts to rotate forward, its driving force synchronously drives the locking block 36, which is closely connected to it, to rotate together. During the rotation, the locking block 36 will gradually come into contact with the contact block 363. Since the rotation of the locking block 36 has a specific direction, after contacting the contact block 363, it will generate a pushing force on the contact block 363, causing the contact block 363 to rotate around the outer periphery of the positioning post 362. During the rotation of the contact block 363, it will squeeze the spring plate 365 installed on the positioning post 362. After being squeezed, the spring plate 365 will undergo elastic deformation and store a certain amount of elastic potential energy. When the locking block 36 continues to rotate and finally disengages from the contact block 363, the elastic potential energy stored in the spring plate 365 is released, generating a rebound force. This rebound force will quickly push the contact block 363 to reset, so that it is in close contact with the locking block 364 again. After the roller 344 provides stable support for the steel pipe, the steel pipe begins to move smoothly along the outer periphery of the connecting cylinder 21 under the action of the pushing unit 14. At this time, the joint in the middle of the steel pipe will meet and contact the contact plate 351. As the steel pipe continues to move, it gradually contacts the inclined surface 352 of the contact plate 351. Due to the special design of the inclined surface 352, when the steel pipe contacts it, it will generate a component force in the direction of the inner cavity 35 on the contact plate 351, thereby pushing the contact plate 351 to move into the inner cavity 35. During the movement of the contact plate 351, it will compress the telescopic spring 355 installed between the contact plate 351 and the inner cavity 35. After being compressed, the telescopic spring 355 will elastically contract and generate an elastic force opposite to the compression direction. At the same time, as the contact plate 351 is compressed by the steel pipe, the contact rod 353 fixed on the contact plate 351 will also move synchronously and compress the pressure sensor 354 installed on the connecting plate 32. The pressure sensor 354 can detect the pressure applied by the contact rod 353 in real time and accurately. When the pressure sensor 354 detects that the pressure on both sides is different, it indicates that the joint of the steel pipe is not in the center position. In this case, in order to ensure the quality of the steel pipe welding, the joint position needs to be adjusted. Since the two rotating rods 233 rotate in different directions, when the pressure on one side is too large, the electric push rod in the opposite direction is retracted, so that the secondary bevel gear 232 is disengaged from the main bevel gear 231. Then the servo motor 23 will start and drive the main bevel gear 231 to rotate in the opposite direction. The reverse rotation of the main bevel gear 231 will drive the secondary bevel gear 232, which rotates in the same opposite direction, to rotate accordingly through the meshing action between the gears. The rotation of the secondary bevel gear 232 will further drive the rotating rod 233 to rotate inside the mounting plate 234. As the rotating rod 233 rotates, several locking blocks 36 fixed on its outer periphery also rotate synchronously. At this time, the contact block 363 is restricted by the locking block 364 and cannot rotate with the locking block 36. In this case, the locking block 36 will exert a force on the contact block 363 through contact during rotation. This force will be transmitted to the connecting plate 32 through the fixing frame 361, thereby driving the connecting plate 32 to rotate synchronously. As the connecting plate 32 rotates, the embedded plate 311 connected to one side of the connecting plate 32 will rotate in the embedded groove 31. Since the connecting plate 32 is closely connected to the rotating rod 233, it will rotate with the rotating rod 233. During this process, the fan-shaped plate 33 and the straight plate 34 always maintain a fixed state, ensuring the stability of the entire support structure. As the connecting plate 32 rotates, the roller 344, which is in close contact with the inner wall of the steel pipe, generates a rotational torque under the action of friction, thereby driving the steel pipe to rotate. Under the drive of the roller 344, the steel pipe begins to rotate slowly, and its joint position gradually changes accordingly. During the rotation of the steel pipe, the pressure sensor 354 continuously monitors the pressure changes on both sides in real time. When the pressure sensor 354 detects that the pressure on both sides is the same, it means that the joint of the steel pipe is in the center position. At this time, the joint of the steel pipe is in a horizontal state, providing the best conditions for subsequent welding work. When welding the steel pipe thereafter, because the joint is in a horizontal state, the welding process can ensure that the weld is uniform and beautiful, and the welding quality is significantly improved. Moreover, this precise joint adjustment method can also effectively avoid welding defects caused by joint position deviation, greatly enhance the structural strength and stability of the steel pipe after welding, extend the service life of the steel pipe, and provide a reliable guarantee for subsequent use.

[0021] Working principle: Before welding the steel pipe, the steel pipe to be welded is placed securely on the pushing unit 14. The pushing unit 14 is started, and the steel pipe moves along the outer periphery of the connecting cylinder 21 under its action. At the same time, the servo motor 23 is started synchronously, driving the main bevel gear 231 to rotate in the forward direction, which in turn drives the two side secondary bevel gears 232 to rotate. The secondary bevel gears 232 then drive the rotating rod 233 to rotate within the mounting plate 234. When the rotating rod 233 rotates, it drives the sector plate 33 to rotate within the slot 321. The straight plate 34, which is always in contact with the sector plate 33, gradually moves outward along the arc surface due to the outward component force generated by the arc surface of the sector plate 33. When the straight plate 34 moves outward, it drives the limiting column 345 to move synchronously within the limiting slot 323, stretching the spring to generate tension. At the same time, the arc plate 341 fixed on the straight plate 34 also moves, causing the roller 344 installed inside the arc plate 341 to gradually approach and eventually make close contact with the inner wall of the steel pipe. At this time, the rollers 344 on both sides of the connecting cylinder 21 provide stable support from inside the steel pipe, ensuring that the steel pipe remains horizontal during welding, avoiding uneven weld height, improving welding quality, enhancing the structural strength and stability of the steel pipe after welding, and providing reliable protection for subsequent use. When the steel pipe is pushed forward, the roller 344 supporting the steel pipe will rotate smoothly around the fixed column 343, providing stable support without hindering the pushing of the steel pipe, ensuring continuous and efficient welding process and improving production efficiency. When the rotating rod 233 continues to rotate and the straight plate 34 moves to the highest point of the arc surface of the fan-shaped plate 33 and is about to descend, the elasticity of the spring pulls the limiting column 345, causing the straight plate 34 to continue to descend along the arc of the fan-shaped plate 33. By controlling the rotation angle of the fan-shaped plate 33, steel pipes of different sizes within a certain range can be effectively supported to ensure stable welding. After the roller 344 provides stable support for the steel pipe, the steel pipe moves smoothly under the action of the pushing unit 14. The joint in the middle of the steel pipe contacts the contact plate 351. As the steel pipe continues to move, it gradually contacts the inclined surface 352 of the contact plate 351, generating a component force in the direction of the inner cavity 35, pushing the contact plate 351 into the inner cavity 35, squeezing the telescopic spring 355 to generate elastic force. At the same time, the contact rod 353 moves synchronously and squeezes the pressure sensor 354. The pressure sensor 354 accurately detects the pressure applied by the contact rod 353 in real time. If the pressure on both sides is different, it indicates that the steel pipe joint is not in the center position and the joint position needs to be adjusted. At this time, the servo motor 23 starts and drives the main bevel gear 231 to rotate in the opposite direction. Through gear meshing, it drives the secondary bevel gear 232 to rotate, which in turn drives the rotating rod 233 to rotate in the mounting plate 234. When the rotating rod 233 rotates, the locking block 36 rotates synchronously. The contact block 363 cannot rotate due to the restriction of the locking block 364. The force generated by the locking block 363 through the contact block 363 is transmitted to the connecting plate 32 through the fixing frame 361, causing the connecting plate 32 to rotate synchronously. When the connecting plate 32 rotates, the inner plate 311 rotates in the inner groove 31, and the fan-shaped plate 33 and the straight plate 34 remain fixed to ensure the stability of the support structure. When the connecting plate 32 rotates, the roller 344 generates a rotational torque under the action of friction, which drives the steel pipe to rotate slowly. The position of the joint gradually changes. The pressure sensor 354 continuously detects the pressure changes on both sides. When the pressure is the same, the steel pipe joint is in the center position, which provides the best conditions for subsequent welding. Welding at this time can ensure that the weld is uniform and beautiful, improve the welding quality, avoid welding defects, enhance the structural strength and stability of the steel pipe, extend its service life, and provide a reliable guarantee for subsequent use.

[0022] 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 substitution or modification made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the welding drawing device for straight seam submerged arc welded steel pipe and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A welding pull-out device for straight seam submerged arc welded steel pipes, comprising a frame (10), the frame (10) including a base frame (11) and welding units (13) on the base frame (11), characterized in that, Also includes: The drive assembly (20) and the adjustment assembly (30) are installed in the base frame (11). The drive assembly (20) includes a connecting cylinder (21) fixed inside the base frame (11), and a transmission component is connected inside the connecting cylinder (21); The adjustment assembly (30) includes an inner groove (31) on both sides of the connecting cylinder (21). The inner groove (31) is connected to a connecting plate (32) through an inner plate (311) that rotates on the inner wall. The connecting plate (32) has a slot (321) and a straight groove (322) inside. A limiting groove (323) is opened through the side of the connecting plate (32). One end of the transmission component extends into the slot (321) and is connected to a fan-shaped plate (33). A straight plate (34) is slidably connected to the inner wall of the straight groove (322). An arc plate (341) extending out of the straight groove (322) is fixed to the top of the straight plate (34). A limiting post (345) that contacts the limiting groove (323) is fixed to one side of the arc plate (341). The bottom end of the straight plate (34) contacts the fan-shaped plate (33). The transmission component rotates, driving the sector plate (33) to rotate. The rotation of the sector plate (33) pushes the straight plate (34) to slide outward, pushing the arc plate (341) to contact the inner wall of the steel pipe. The connecting cylinder (21) has a symmetrical inner cavity (35) on its outside, and a contact plate (351) that contacts the joint of the steel pipe slides on the inner wall of the inner cavity (35). A telescopic spring (355) is connected between the contact plate (351) and the inner cavity (35). A contact rod (353) is fixed on one side of the contact plate (351), and a pressure sensor (354) that contacts the contact rod (353) is installed on the inner wall of the inner cavity (35). The contact plate (351) has inclined surfaces (352) on both sides that contact the joint of the steel pipe. The connecting plate (32) has an opening in the interior of a clearance groove (324), and a snap-fit ​​block (36) is provided on the outer periphery of the transmission component. A fixing frame (361) is fixed on the inner wall of the clearance groove (324), and a positioning post (362) is fixed between the inner walls of the fixing frame (361). A contact block (363) that contacts the snap-fit ​​block (36) is rotatably connected to the outer periphery of the positioning post (362). A snap-fit ​​block (364) that contacts the contact block (363) and a spring sheet (365) are installed on the inner wall of the clearance groove (324).

2. The welding pull-out device for straight seam submerged arc welded steel pipes according to claim 1, characterized in that, The arc plate (341) has several grooves (342) inside, and the inner wall of the groove (342) is fixed with a fixing column (343), and the outer periphery of the fixing column (343) has a roller (344) that contacts the inner wall of the steel pipe.

3. The welding pull-out device for straight seam submerged arc welded steel pipes according to claim 2, characterized in that, The bottom of the straight plate (34) is provided with an arc corner, and a spring is connected between the limiting post (345) and the limiting groove (323).

4. The welding pull-out device for straight seam submerged arc welded steel pipes according to claim 1, characterized in that, The transmission component includes a fixed plate (22) fixed inside the connecting cylinder (21). A servo motor (23) is installed on the top of the fixed plate (22). The output end of the servo motor (23) passes through the fixed plate (22) and is connected to the main bevel gear (231). An installation plate (234) is fixed inside the connecting cylinder (21). A rotating rod (233) is rotatably connected inside the installation plate (234). One end of the rotating rod (233) extends out of the installation plate (234) and is connected to a secondary bevel gear (232). An electric push rod is connected between the secondary bevel gear (232) and the rotating rod (233). The secondary bevel gear (232) is meshed with the main bevel gear (231). A vent (235) is opened on the outer periphery of the installation plate (234).

5. The welding pull-out device for straight seam submerged arc welded steel pipes according to claim 1, characterized in that, The frame (10) also includes a push unit (14) located at the bottom of the base frame (11) and a control cabinet (12) on one side of the base frame (11).

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