Pipe straight seam welding system

Abstract

The utility model relates to a pipe straight seam welding system which is provided with a working platform and a machine frame fixed on the working platform, the working platform is provided with a feeding station, a calibration station and a welding station, the feeding station is provided with a feeding mechanism and an outer centering mechanism, the feeding mechanism can feed, clamp and position pipes, and the outer centering mechanism can clamp and position the pipes. The calibration station is provided with an inner centering mechanism, a hanging arm, a hook mechanism and a pipe pushing mechanism, wherein the hanging arm is fixed to the rack and can stretch into a pipe to support the pipe when the pipe is fed, the hook mechanism can be connected with the hanging arm in a matched mode, and the pipe pushing mechanism can push, press and position the pipe on the hanging arm. The piano key pressing plate mechanisms are oppositely arranged on the rack and can abut against the tops of the pipes, and a laser welding mechanism capable of welding weld joints on the pipes is arranged on the welding station. The pipe welding device is ingenious in structure, capable of achieving fast, efficient, stable and accurate welding of pipes, convenient to use and practical.

Description

Technical Field

[0001] The utility model relates to the field of pipe straight seam welding, in particular to a pipe straight seam welding system. Background Art

[0002] Straight seam pipe is widely used in various industries, including construction, oil and gas, chemicals, automobile manufacturing, railways and rail transit, urban construction and municipal engineering, and the new energy sector. In the construction industry, straight seam pipe is used in columns, beams, stair railings, and other parts of building structures. In the oil and gas industry, it is used in oil and gas pipelines, where it can withstand high pressure and high temperature. In the chemical industry, straight seam pipe is used in piping systems for transporting liquids and gases. In the automotive industry, it is used in vehicle chassis, body structures, and exhaust systems. In the railway and rail transit industry, straight seam pipe is used in the construction of railway lines and track laying. In urban construction and municipal engineering, it is used in the construction of pipelines for water supply and drainage systems, heating systems, and gas supply systems. In the new energy industry, straight seam pipe is used in the construction of energy facilities such as solar photovoltaic power stations, wind farms, and thermal power plants.

[0003] Straight seam pipe, also known as straight seam welded pipe or straight seam steel pipe, is a pipe with a weld seam parallel to the longitudinal direction of the pipe. It is manufactured by rolling a long steel strip of a certain specification using a high-frequency welding unit and then straight-seam welding it. However, conventional welding of straight seam pipes typically involves spot welding the weld seam first and then manually welding the seam. This welding method is time-consuming and labor-intensive when positioning and loading the pipe, and also results in low welding efficiency and poor weld quality, making it very inconvenient. Utility Model Content

[0004] The purpose of the utility model is to provide a pipe straight seam welding system with an ingenious structure, which can weld pipes quickly and efficiently in an automated manner, and is convenient and practical.

[0005] The technical solution for achieving the purpose of the utility model is as follows: the utility model comprises a working platform and a frame fixed on the working platform, the working platform is provided with a loading station, a calibration station and a welding station, the loading station is provided with a feeding mechanism capable of feeding and clamping the pipe and an external centering mechanism, the calibration station is provided with an internal centering mechanism, a hanging arm fixed on the frame and capable of extending into the pipe to support the pipe when feeding the pipe, a hook mechanism capable of cooperating with the hanging arm, a pipe pushing mechanism capable of pushing and positioning the pipe on the hanging arm, and a piano key pressing plate mechanism relatively arranged on the frame and capable of pressing the top of the pipe, the welding station is provided with a laser welding mechanism capable of welding the weld on the pipe;

[0006] The feeding mechanism and the pushing tube mechanism are respectively arranged on both sides of the frame. The feeding mechanism feeds the pipe after the hook mechanism disengages from the hanging arm. When the pipe on the feeding mechanism is fed, it is aligned by the coordinated cooperation of the outer centering mechanism and the inner centering mechanism. The hook mechanism resets after the pipe enters the welding station and supports the pipe through the coordinated cooperation with the hanging arm. The pushing tube mechanism resets after pushing and positioning the pipe. The feeding mechanism is provided with side pressing components that are opposite to each other and slidably arranged. Each side pressing component corresponds to each key pressing plate mechanism one by one. The side pressing components on both sides sequentially press against the sides of the pipe through the coordinated cooperation with the corresponding key pressing plate mechanisms. Each side pressing component resets after the key pressing plate mechanisms on both sides of the weld are tightened. The laser welding mechanism welds the pipe after the pipe is positioned.

[0007] Further, the above-mentioned feeding mechanism includes a feeding base frame and a feeding motor fixed on the feeding base frame and capable of driving the feeding base frame to slide on the working platform. Each side pressing component is slidably arranged on the feeding base frame. The side pressing component includes a side motor fixed on the feeding base frame and a pressing support slidably arranged on the feeding base frame under the drive of the side motor. The moving direction of the pressing support is perpendicular to the moving direction of the feeding base frame. The pressing support includes a pressing bottom plate, a pressing top plate, a plurality of pressing side plates evenly distributed along the moving direction of the feeding base frame, and a support component capable of supporting and adjusting the pipe. The upper and lower ends of each pressing side plate are respectively fixed to the pressing bottom plate and the pressing top plate. Each pressing side plate is provided with a pressing notch. The pressing notches on each pressing side plate form a pressing groove capable of pressing against the side of the pipe. The pressing grooves on each pressing support are arranged oppositely.

[0008] Further, the above-mentioned support component includes two support motors fixed on the feeding base frame, a support shaft rotatably arranged on the pressing support under the drive of the support motor, a plurality of straps, and a plurality of support bars connecting each strap. The axis of the support shaft is parallel to the moving direction of the feeding base frame. The support shaft is rotatably connected to each pressing side plate after passing through each pressing side plate. A support gap is formed between each adjacent pressing side plate. The support gaps on each pressing support correspond one by one. Each strap is arranged in the corresponding support gap. One end of each strap is wound around the support shaft of the corresponding support gap. The other end of each strap sequentially bypasses the top end of the pressing top plate on the same side and the top end of the pressing top plate on the other side and then is wound around the support shaft of the support gap on the other side. Each strap is arranged in parallel. The extending direction of each support bar is parallel to the axis of the support shaft. The support bar is perpendicular to each strap. Each support bar is fixedly connected to each strap through a locking member.

[0009] Further, the above-mentioned outer centering mechanism includes a first cylinder rotatably connected to the frame, an outer centering bracket rotatably connected to the frame, an outer centering knife fixed on the outer centering bracket and capable of being inserted into the weld seam, a red light linear lamp fixed on the frame and capable of calibrating the weld seam, and a feeding detection sensor fixed on the outer centering knife. The telescopic end of the first cylinder is rotatably connected to the outer centering bracket. The rotation axis of the outer centering bracket is perpendicular to the moving direction of the feeding mechanism. The outer centering knife is inserted into the weld seam of the pipe through the drive of the first cylinder on the outer centering bracket and the coordinated cooperation with the red light linear lamp, and the feeding of the pipe is sensed by the feeding detection sensor.

[0010] Further, the above-mentioned inner centering mechanism includes a plurality of second cylinders fixed on the frame, an inner centering bracket rotatably connected to the frame under the synchronous drive of each second cylinder, and an inner centering knife fixed on the inner centering bracket. The telescopic end of each second cylinder is rotatably connected to the inner centering bracket. The rotation direction of the inner centering bracket is perpendicular to the rotation direction of the outer centering bracket. The centering knife on the inner centering bracket extends into the relative key pressing plate mechanisms under the drive of the second cylinder and is coplanar with the outer centering knife extending into the weld seam under the drive of the first cylinder.

[0011] Further, the above-mentioned hook mechanism includes a third cylinder rotatably connected to the frame, a hook bracket rotatably connected to the frame under the drive of the third cylinder, and clamping plates oppositely arranged on the hook bracket. The rotation axis of the hook bracket is perpendicular to the moving direction of the feeding mechanism. The hook bracket includes two hook plates oppositely arranged and rotatably connected to the frame, and a connecting plate connecting the two hook plates. The telescopic end of the third cylinder is rotatably connected to any one of the hook plates. The oppositely arranged clamping plates are fixed on the connecting plate. Each clamping plate is provided with a hook groove. One end of the hanging arm close to the clamping plate is provided with a connecting block corresponding to each clamping plate and capable of being inserted into the hook groove. The hook bracket is connected to the hanging arm through the drive of the third cylinder and the insertion and cooperation of each hook groove and the connecting wheel, and supports the hanging arm.

[0012] Further, the above-mentioned hook groove is sequentially provided with a guiding inclined surface for guiding the connecting block to be introduced into or exported from the hook groove, a pressing arc surface for pressing the connecting block, and an anti-detachment surface. The hook groove forms a hook connection with the connecting block through the drive of the third cylinder on the hook bracket. After the connecting block is connected to the hook groove, the pressing arc surface forms surface contact with the connecting block, and the anti-detachment surface forms line contact with the connecting block. [[ID=io]]

[0013] Further, the above-mentioned push tube mechanism includes a push tube bracket fixed on the working platform, a first linear module fixed on the push tube bracket, a push tube block slidably arranged on the first linear module driven by the first linear module, and push tube plates oppositely arranged on the push tube block. The moving direction of the push tube block is parallel to the extending direction of the hanging arm. The hanging arm is provided with limiting sliding grooves corresponding to each push tube plate. The connecting plate is provided with limiting pressing blocks for limiting and pressing the pipe. Each push tube plate drives the push tube block through the first linear module and slides with the limiting sliding grooves to push the pipe on the hanging arm against the limiting pressing blocks.

[0014] Further, the above-mentioned key pressing plate mechanism includes a key connecting rod rotatably connected to the frame, a key connecting plate arranged in parallel with the key connecting rod, a plurality of key pressing plates evenly distributed along the extending direction of the key connecting rod, and a pressing airbag. The key connecting rod and the key connecting plate are both arranged in parallel with the hanging arm. The rotation axis of the key connecting rod is parallel to the extending direction of the key connecting rod. The two ends of each key pressing plate are respectively fixedly connected to the key connecting rod and the key connecting plate, and the key connecting plate is fixed to the bottom surface of each key pressing plate. The frame is further provided with a limiting bottom plate, which is located between the frame and each key pressing plate, and the pressing airbag is arranged between the limiting bottom plate and each key pressing plate. Each key pressing plate is provided with a vertically arranged limiting connecting rod at its upper end. Each limiting connecting rod passes through the limiting bottom plate and is slidably connected to the limiting bottom plate. A buffer spring is sleeved on each limiting connecting rod, and each buffer spring is located at the upper end of the limiting bottom plate. The two ends of each buffer spring act between the limiting bottom plate and the corresponding limiting connecting rod respectively. Each key pressing plate presses the pipe after the pressing airbag is inflated, and is reset through the sliding cooperation between each limiting connecting rod and the limiting bottom plate and the continuous force application of the buffer spring after the pressing airbag deflates. A welding gap is formed between the key connecting plates on the oppositely arranged key pressing plate mechanisms.

[0015] Further, the hanging arm is provided with an installation groove arranged in parallel with the welding gap. A welding copper bar is installed in the installation groove. The upper end of the welding copper bar is provided with a horizontally arranged pressing plane that can form a surface contact with the pipe. The upper end of the welding copper bar is further provided with a welding groove arranged in parallel with the extending direction of the welding copper bar. The bottom of the welding groove is provided with a plurality of air holes through which a protective gas can be introduced.

[0016] Further, one end of each key connecting plate close to the limiting pressing block is provided with an avoidance groove. The limiting pressing block is provided with a limiting plate corresponding to each avoidance groove. Each limiting plate limits the rotation of the hook bracket through the clamping cooperation with the avoidance groove.

[0017] Further, the above laser welding mechanism includes a second linear module fixed on the frame, a moving bracket slidably arranged on the second linear module driven by the second linear module, a welding cylinder arranged on the moving bracket, a welding bracket arranged on the moving bracket and lifted and lowered driven by the welding cylinder, a wire feeding joint arranged on the welding bracket, and a laser welding gun arranged on the welding bracket. The second linear module is arranged parallel to the first linear module. A wire reel for winding welding wire and a wire feeder adapted to the wire reel are arranged on the frame. The wire feeder is connected to the wire feeding joint through a wire feeding pipe. The laser welding gun welds the weld seam on the pipe through the driving of the moving bracket by the second linear module, the driving of the welding bracket by the welding cylinder, and the coordinated cooperation of the wire feeding joint.

[0018] The purpose of the present utility model is to provide a welding method based on a pipe straight seam welding system, which can accurately and comprehensively position and weld the pipe, thereby ensuring the welding efficiency and welding quality, and is practical and convenient.

[0019] The technical solution to achieve the purpose of the present utility model is: The present utility model includes the following operation steps:

[0020] S1. Place the pipe to be welded on the strap, and calibrate the weld seam through a red light one - line lamp.

[0021] S2. The third cylinder is started, and the third cylinder drives the hook bracket. The hook groove of the clamping plate on the hook bracket is disengaged from the connecting block on the hanging arm and rotates above the frame.

[0022] S3. The first cylinder is started, and the first cylinder drives the outer centering bracket. After the outer centering knife is inserted into the weld seam of the pipe, the second cylinder is started, and the second cylinder drives the inner centering bracket. The inner centering knife is inserted into the welding gap between the key - link plates.

[0023] S4. After the feeding detection sensor detects the pipe, the feeding motor is started. The feeding motor drives the feeding bottom frame and the pipe on the feeding bottom frame to feed. The outer centering knife completely passes through the weld seam and resets when the pipe is feeding. The inner centering knife enters the weld seam, and at the same time, the hanging arm extends into the pipe.

[0024] S5. After the pipe feeding is completed, the feeding motor stops, and the third cylinder is controlled to start. The third cylinder drives the hook bracket. After the hook groove of the clamping plate on the hook bracket is connected to the connecting block on the hanging arm, it supports the hanging arm.

[0025] S6. The first linear module is started, and the first linear module drives the pushing pipe block. The pushing pipe block drives the pushing pipe plate to push one end of the pipe. When the other end of the pipe is pressed against the limiting plate of the limiting block, the first linear module drives the pushing pipe block and the pushing pipe plate to reset.

[0026] S7. The side motor on either side starts, and the side motor drives the corresponding pressing bracket to press one side of the pipe. After the pressing is completed, the pressing airbag on the corresponding side is inflated to press the upper end of the pipe.

[0027] S8. The second cylinder drives the inner centering bracket to reset. During the reset process of the inner centering knife, it disengages from the weld seam and the welding gap, and the second cylinder stops driving after the inner centering knife is reset.

[0028] S9. The pressing airbag on the other side is inflated to press the upper end of the pipe. After the pressing is completed, the side motor on the other side starts, and the side motor drives the corresponding pressing bracket to press the pipe.

[0029] S10. After the pressing is completed, each side motor drives each pressing bracket to reset and stops driving after the reset. At the same time, each supporting motor 35 drives each supporting shaft 36 to rotate synchronously in opposite directions to support the bottom of the pipe and ensure that the height of the pipe remains unchanged.

[0030] S11. The second linear module and the welding cylinder start. While the laser welding torch welds the weld seam, a shielding gas is introduced into the welding groove in the connecting copper bar.

[0031] S12. After the welding is completed, the second linear module and the welding cylinder drive the laser welding torch to reset and stop driving. Each pressing airbag deflates, and the third cylinder starts. The third cylinder drives the hook bracket, and the hook groove of the clamping plate on the hook bracket disengages from the connecting block on the hanging arm. After rotating above the frame, the feeding motor starts. The feeding motor drives the feeding chassis to reset and stop driving. After the feeding chassis resets, the welded pipe is taken out.

[0032] Further, after the pipe is placed on each strap, each supporting motor drives the supporting shaft, and each strap rotates in the same or opposite direction under the drive of the supporting shaft.

[0033] Further, each supporting motor drives each support to rotate in the same direction through the drive of the supporting shaft. Each strap rotates in the same direction through each supporting shaft and drives the pipe to rotate until the weld seam coincides with the light of the red light one - line lamp.

[0034] Further, each supporting motor drives each support to rotate synchronously in opposite directions through the drive of the supporting shaft. Each strap drives the pipe to lift and lower through the reverse rotation of each supporting shaft.

[0035] The present invention has positive effects: (1) The present invention arranges a feeding mechanism on the working platform to make preliminary adjustments to the pipe, calibrate the position of the weld and feed the pipe, arranges an external centering mechanism to calibrate the weld of the pipe during feeding to avoid the pipe from being offset during feeding, arranges an internal centering mechanism to calibrate the weld of the pipe after feeding, arranges a hanging arm and a hook mechanism to stably support the pipe after feeding and thereby ensure the horizontality of the pipe after feeding, arranges a pipe pushing mechanism to push the pipe and thereby perform axial positioning of the pipe, after the positioning of the pipe is completed, each key pressure plate mechanism cooperates with the corresponding side pressure assembly on the feeding chassis to completely position and press the pipe, after the pressing is completed, the weld is welded by a laser welding mechanism, and the automatic feeding, positioning and welding of the pipe effectively solves the problems of low welding efficiency and poor welding quality caused by manual welding in the prior art, and ensures the stability of the pipe welding through automation while also improving the efficiency and welding quality of the weld on the pipe. The structure is ingenious and efficient and practical.

[0036] (2) The utility model sets a side pressing assembly on the feeding frame, and the pressing bracket presses the side of the pipe through the drive of the side motor. On the one hand, it can achieve stable and firm pressing on the side wall of the pipe. On the other hand, it can also be used for pipes of various diameters. It has good adjustability and applicability, and is convenient and practical.

[0037] (3) The utility model provides a support assembly on the pressure bracket, supports the pipe through various straps, and drives the support shaft through the support motor. Each support motor drives the support shaft to rotate in the same direction, which can drive the pipe to rotate, thereby adjusting the position of the weld on the pipe. Each support motor drives the support shaft to rotate in the opposite direction, which can drive the pipe to adjust its height, thereby adjusting the height of the pipe accurately and efficiently.

[0038] (4) The utility model sets the external centering mechanism as the first cylinder to drive the external centering bracket to rotate. After the external centering knife on the external centering bracket is stuck in the weld of the pipe, on the one hand, it can ensure the accuracy of the weld centering, and on the other hand, it can also avoid the weld from shifting during the feeding process of the pipe, laying the foundation for the subsequent positioning of the pipe and the accuracy of the weld.

[0039] (5) The utility model sets the inner centering mechanism as a second cylinder to drive the inner centering bracket to rotate. On the one hand, the inner centering knife on the inner centering bracket can bear the weld seam calibrated by the outer centering knife during feeding. On the other hand, it can also be used as the basis for the key pressing plate mechanism and the pressing bracket, and also lays the foundation for the accuracy of subsequent welding.

[0040] (6) The utility model supports the pipe through the cooperation of the hook bracket driven by the third cylinder and the hanging arm. On the one hand, the levelness of the pipe is ensured by the connection with the hanging arm. On the other hand, the connection and disconnection of the hook bracket and the hanging arm facilitate the feeding and discharging of the pipe, avoid interference during the feeding and discharging of the pipe, and ensure the safety of the pipe feeding and the stability of the pipe after feeding.

[0041] (7) The utility model sets the hook groove as the cooperation of the guiding inclined plane, the pressing arc surface and the anti - detachment surface. Through the surface contact formed by the pressing arc surface and the connecting block, and the cooperation of the anti - detachment surface and the connecting block, the deflection of the hanging arm is greatly reduced. The deformation of the hanging arm is reduced through the support, ensuring the support of the hanging arm for the pipe, which is convenient and practical.

[0042] (8) The utility model sets a pipe - pushing mechanism, which drives the pipe - pushing block and the pipe - pushing plate on the pipe - pushing block through the first linear module, so as to position and press the pipe. Through the pipe - pushing mechanism, the initial welding position of the pipe can be calibrated and positioned, laying a foundation for the accuracy of subsequent laser welding, which is efficient and practical.

[0043] (9) The utility model sets a piano - key pressing plate mechanism, which drives the piano - key pressing plate by setting a pressing airbag. After the pressing airbag is inflated, it squeezes the piano - key pressing plate, presses the piano - key pressing plate on the pipe, and uses the buffer spring to reset the piano - key pressing plates after the pressing airbag deflates. It can not only ensure the stable pressing of each piano - key pressing plate on the pipe, but also ensure the quick release of the piano - key pressing plate on the pipe, which is safe and practical.

[0044] (10) The utility model sets a welding copper bar in the installation groove. The air holes at the bottom of the welding groove in the welding copper bar can be used as nozzles for protective gas, preventing oxygen and nitrogen in the air from entering the welding area, thereby protecting the weld from oxidation and ensuring the efficiency and safety of the weld welding.

[0045] (11) The utility model sets an avoidance groove. Through the clamping connection of the avoidance groove and the limiting plate, the rotational limit of the hook mechanism during rotation and reset is realized, avoiding the irregular and excessive rotation of the hook bracket, which is safe and practical.

[0046] (12) The utility model drives the moving bracket to move horizontally through the second linear module. The laser welding gun mounted on the moving bracket for welding is lifted and lowered to weld the weld on the fixed pipe through the coordinated cooperation with the wire - feeding joint, thus ensuring the accuracy and efficiency of the weld welding, which is convenient and practical. Brief Description of the Drawings

[0047] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to specific embodiments and in combination with the drawings, where

[0048] Figure 1 This is the front view of the overall structure of the pipe straight seam welding system in the present utility model;

[0049] Figure 2 This is the schematic diagram of the overall structure of the feeding mechanism in the present utility model;

[0050] Figure 3 This is the cross-sectional view of the connection structure between the pressing support and the strap in the present utility model;

[0051] Figure 4 This is the schematic diagram of the overall structure of the external centering mechanism in the present utility model;

[0052] Figure 5 This is the schematic diagram of the overall structure of the internal centering mechanism in the present utility model;

[0053] Figure 6 This is the schematic diagram of the overall structure of the hooking mechanism in the present utility model;

[0054] Figure 7 This is the schematic diagram of the overall structure of the clamping plate in the present utility model;

[0055] Figure 8 This is the schematic diagram of the overall structure of the pipe pushing mechanism in the present utility model;

[0056] Figure 9 This is the schematic diagram of the overall structure of the hanging arm in the present utility model;

[0057] Figure 10 This is the schematic diagram of the overall structure of the key-shaped pressing plate mechanism in the present utility model;

[0058] Figure 11 This is the schematic diagram of the overall structure of the laser welding mechanism in the present utility model. Detailed implementation manners

[0059] See Figures 1 to 11 , the pipe straight seam welding system has a working platform 1 and a frame 11 fixed on the working platform 1. The working platform 1 is provided with a feeding station, a calibration station and a welding station. The feeding station is provided with a feeding mechanism 3 for feeding and clamping and positioning the pipe, and an external centering mechanism 4. The calibration station is provided with an internal centering mechanism 5, a hanging arm 2 fixed on the frame 11 and extending into the pipe to support the pipe when the pipe is fed, a hooking mechanism 6 that can be cooperatively connected with the hanging arm 2, a pipe pushing mechanism 7 for pushing and positioning the pipe on the hanging arm 2, and a key-shaped pressing plate mechanism 8 oppositely arranged on the frame 11 and capable of pressing the top of the pipe. The welding station is provided with a laser welding mechanism 9 for welding the weld on the pipe;

[0060] The feeding mechanism 3 and the push tube mechanism 7 are respectively arranged on both sides of the frame 11. The feeding mechanism 3 feeds the pipe after the hook mechanism 6 disengages from the hanging arm 2. When the pipe on the feeding mechanism 3 is fed, seam alignment is carried out through the coordinated cooperation of the outer alignment mechanism 4 and the inner alignment mechanism 5. After the pipe enters the welding station, the hook mechanism 6 resets and supports the pipe through the coordinated cooperation with the hanging arm 2. After the push tube mechanism 7 pushes and positions the pipe, it resets. The feeding mechanism 3 is provided with side pressing components that are relatively and slidably arranged, and each side pressing component corresponds to each key pressing plate mechanism 8 one by one. The side pressing components on both sides sequentially press against the sides of the pipe through the coordinated cooperation with the corresponding key pressing plate mechanisms 8. Each side pressing component resets after the key pressing plate mechanisms 8 press both sides of the weld seam. The laser welding mechanism 9 welds the pipe after the pipe is positioned.

[0061] The feeding mechanism 3 includes a feeding bottom frame 32 and a feeding motor 31 fixed on the feeding bottom frame 32 and capable of driving the feeding bottom frame 32 to slide on the working platform 1. Each side pressing component is slidably arranged on the feeding bottom frame 32. The side pressing component includes a side motor 34 fixed on the feeding bottom frame 32 and a pressing support 33 slidably arranged on the feeding bottom frame 32 under the drive of the side motor 34. The moving direction of the pressing support 33 is perpendicular to the moving direction of the feeding bottom frame 32. The pressing support 33 includes a pressing bottom plate 331, a pressing top plate 333, a plurality of pressing side plates 332 evenly distributed along the moving direction of the feeding bottom frame 32, and a support component capable of supporting and adjusting the pipe. The upper and lower ends of each pressing side plate 332 are respectively fixed to the pressing bottom plate 331 and the pressing top plate 333. Each pressing side plate 332 is provided with a pressing notch, and the pressing notches on each pressing side plate 332 form a pressing groove capable of pressing against the side of the pipe. The pressing grooves on each pressing support 33 are arranged oppositely.

[0062] The working platform 1 is provided with relatively arranged first slide rails and a first rack parallel to the first slide rails. The bottom of the feeding bottom frame 32 is provided with first sliders adapted to the first slide rails. The feeding motor 31 is fixed on the feeding bottom frame 32. A speed reducer is provided on the feeding motor 31, and a first gear adapted to the first rack is provided at the output end of the speed reducer. The feeding bottom frame 32 is slidably arranged on the working platform 1 through the sliding cooperation of each first slider and the first slide rails, the driving of the first gear by the feeding motor 31, and the transmission cooperation of the first gear and the first rack.

[0063] Two pairs of oppositely arranged second slide rails are provided on the feeding chassis 32. The extending direction of the second slide rails is perpendicular to the extending direction of the first slide rails. Second sliders adapted to the respective second slide rails are provided at the bottoms of the respective pressing brackets 33. A pressing motor corresponding to each pressing bracket 33 is provided on the feeding chassis 32. A lead screw is fixedly provided at the output end of the pressing motor. Connection blocks are provided at the bottoms of the respective pressing bottom plates 331. Screw holes corresponding to the lead screws are provided on the connection blocks. The respective pressing brackets 33 are slidably connected to the feeding chassis 32 through the driving of the lead screw by the pressing motor, the transmission cooperation between the lead screw and the connection blocks, and the cooperation between the respective second sliders and the second slide rails.

[0064] The support assembly includes two support motors 35 fixed on the feeding chassis 32, a support shaft 36 rotatably arranged on the pressing bracket 33 under the drive of the support motor 35, a plurality of straps 37, and a plurality of support bars 38 connecting the respective straps 37. The axis of the support shaft 36 is parallel to the moving direction of the feeding chassis 32. The support shaft 36 is rotatably connected to the respective pressing side plates 332 after passing through the respective pressing side plates 332. Support gaps are formed between adjacent pressing side plates 332. The respective support gaps on the respective pressing brackets 33 correspond one by one. The respective straps 37 are arranged in the corresponding support gaps. One end of each strap 37 is wound around the support shaft 36 of the corresponding support gap. The other end of each strap 37 sequentially bypasses the top ends of the pressing top plates 333 on the same side and the top ends of the pressing top plates 333 on the other side and then is wound around the support shaft 36 of the support gap on the other side. The respective straps 37 are arranged in parallel. The extending direction of the respective support bars 38 is parallel to the axis of the support shaft 36. The support bars 38 are perpendicular to the respective straps 37. The respective support bars 38 are fixedly connected to the respective straps 37 through locking members.

[0065] The outer centering mechanism 4 includes a first cylinder 41 rotatably connected to the frame 11, an outer centering bracket 42 rotatably connected to the frame 11, an outer centering knife 43 fixed on the outer centering bracket 42 and capable of being inserted into the weld seam, a red light one-line lamp fixed on the frame 11 and capable of calibrating the weld seam, and a feeding detection sensor fixed on the outer centering knife 43. The telescopic end of the first cylinder 41 is rotatably connected to the outer centering bracket 42. The rotation axis of the outer centering bracket 42 is perpendicular to the moving direction of the feeding mechanism 3. The outer centering knife 43 is inserted into the weld seam of the pipe through the driving of the outer centering bracket 42 by the first cylinder 41 and the coordinated cooperation with the red light one-line lamp, and the feeding of the pipe is sensed by the feeding detection sensor.

[0066] When each support motor 35 drives each support shaft 36 synchronously and in the same direction, it can drive the pipe to rotate. After the lamp tube of the red light one-line lamp passes through the weld, the support motor 35 stops driving. When each support motor 35 drives each support shaft 36 synchronously and in the opposite direction, it can drive the pipe to adjust its height.

[0067] The inner centering mechanism 5 includes a plurality of second cylinders 51 fixed on the frame 11, an inner centering bracket 52 rotatably connected to the frame 11 under the synchronous drive of each second cylinder 51, and an inner centering knife 53 fixed on the inner centering bracket 52. The telescopic ends of the second cylinders 51 are rotatably connected to the inner centering bracket 52. The rotation direction of the inner centering bracket 52 is perpendicular to the rotation direction of the outer centering bracket 42. The centering knives on the inner centering bracket 52 extend into the relative piano key pressing plate mechanisms 8 under the drive of the second cylinders 51 and are coplanar with the outer centering knives 43 that extend into the weld under the drive of the first cylinder 41.

[0068] Setting the outer centering knife 43 and the inner centering knife 53 to be coplanar can ensure that the pipe does not shift during the feeding process, and at the same time ensures the accuracy of tool alignment, as well as the accuracy of later pipe positioning and welding.

[0069] The hook mechanism 6 includes a third cylinder 61 rotatably connected to the frame 11, a hook bracket 62 rotatably connected to the frame 11 under the drive of the third cylinder 61, and clamping plates 63 oppositely arranged on the hook bracket 62. The rotation axis of the hook bracket 62 is perpendicular to the moving direction of the feeding mechanism 3. The hook bracket 62 includes two hook plates 621 oppositely arranged and rotatably connected to the frame 11, and a connecting plate 622 connecting the two hook plates 621. The telescopic end of the third cylinder 61 is rotatably connected to any one of the hook plates 621. The oppositely arranged clamping plates 63 are fixed on the connecting plate 622. Each clamping plate 63 is provided with a hook groove 64. One end of the hanging arm 2 close to the clamping plate 63 is provided with a connecting block 23 corresponding to each clamping plate 63 and capable of being inserted into the hook groove 64. The hook bracket 62 forms a connection with the hanging arm 2 through the drive of the third cylinder 61 and the insertion and cooperation of each hook groove 64 with the connecting block, and supports the hanging arm 2.

[0070] The hook groove 64 is successively provided with a guiding inclined surface 641 for guiding the connecting block 23 to be inserted into or taken out of the hook groove 64, a pressing arc surface 642 for pressing against the connecting block 23, and an anti - detachment surface 643. The hook groove 64 forms a hook connection with the connecting block 23 through the drive of the third cylinder 61 on the hook bracket 62. After the connecting block 23 is connected to the hook groove 64, the pressing arc surface 642 forms surface contact with the connecting block 23, and the anti - detachment surface 643 forms line contact with the connecting block 23.

[0071] The push tube mechanism 7 includes a push tube bracket 71 fixed on the working platform 1, a first linear module 72 fixed on the push tube bracket 71, a push tube block 73 slidably arranged on the first linear module 72 driven by the first linear module 72, and push tube plates 74 oppositely arranged on the push tube block 73. The moving direction of the push tube block 73 is arranged parallel to the extending direction of the hanging arm 2. The hanging arm 2 is provided with limit sliding grooves 22 corresponding to the respective push tube plates 74. The connecting plate 622 is provided with limit pressing blocks 65 that can limit and press the pipe. Each push tube plate 74 pushes the pipe on the hanging arm 2 against the limit pressing block 65 through the driving of the push tube block 73 by the first linear module 72 and the sliding cooperation with the limit sliding grooves 22.

[0072] The key pressing plate mechanism 8 includes a key link 81 rotatably connected to the frame 11, a key connecting plate 82 arranged parallel to the key link 81, a plurality of key pressing plates 83 evenly distributed along the extending direction of the key link 81, and a pressing airbag 85. The key link 81 and the key connecting plate 82 are both arranged parallel to the hanging arm 2. The rotation axis of the key link 81 is arranged parallel to the extending direction of the key link 81. The two ends of each key pressing plate 83 are respectively fixed to the key link 81 and the key connecting plate 82, and the key connecting plate 82 is fixed to the bottom surface of each key pressing plate 83. The frame 11 is further provided with a limit bottom plate 84. The limit bottom plate 84 is located between the frame 11 and each key pressing plate 83. The pressing airbag 85 is arranged between the limit bottom plate 84 and each key pressing plate 83. Each key pressing plate 83 is provided with a vertically arranged limit link 86 at its upper end. Each limit link 86 passes through the limit bottom plate 84 and is slidably connected to the limit bottom plate 84. The limit bottom plate 84 is provided with through holes or waist-shaped grooves for the limit links 86 to pass through. If it is a through hole, the diameter of the through hole is larger than the diameter of the limit link 86 and has a margin for the limit link 86 to displace in the through hole. If it is a waist-shaped groove, the groove length of the waist-shaped groove is larger than the diameter of the limit link 86 to provide a margin for the limit link 86 to displace during the downward pressing of the key pressing plate 83. Each limit link 86 is sleeved with a buffer spring 87. Each buffer spring 87 is located at the upper end of the limit bottom plate 84. The two ends of each buffer spring 87 act between the limit bottom plate 84 and the corresponding limit link 86 respectively. Each key pressing plate 83 presses the pipe through the inflation of the pressing airbag 85 and resets through the sliding cooperation between each limit link 86 and the limit bottom plate 84 and the continuous force application of the buffer spring 87 after the pressing airbag 85 deflates. A welding gap is formed between the key connecting plates 82 on the oppositely arranged key pressing plate mechanisms 8.

[0073] The hanging arm 2 is provided with an installation groove 21 arranged parallel to the welding gap. A welding copper bar 24 is installed in the installation groove 21. The upper end of the welding copper bar 24 is provided with a pressing plane 242 arranged horizontally and capable of forming surface contact with the pipe. The upper end of the welding copper bar 24 is further provided with a welding groove 241 arranged parallel to the extending direction of the welding copper bar 24. The bottom of the welding groove 241 is provided with a plurality of air holes through which shielding gas can pass.

[0074] One end of each key connecting plate 82 close to the limit pressing block 65 is provided with an avoidance groove 821. The limit pressing block 65 is provided with a limit plate 66 corresponding to each avoidance groove 821. Each limit plate 66 performs rotational limiting on the hook bracket 62 through clamping cooperation with the avoidance groove 821.

[0075] The laser welding mechanism 9 includes a second linear module 91 fixed on the frame 11, a moving bracket 92 slidably arranged on the second linear module 91 driven by the second linear module 91, a welding cylinder 93 arranged on the moving bracket 92, a welding bracket 94 arranged on the moving bracket 92 and lifted and lowered driven by the welding cylinder 93, a wire feeding joint 96 arranged on the welding bracket 94, and a laser welding gun 97 arranged on the welding bracket 94. The second linear module 91 is arranged parallel to the first linear module 72. The frame 11 is provided with a wire spool for winding welding wire and a wire feeder 98 adapted to the wire spool. The wire feeder 98 is connected to the wire feeding joint 96 through a wire feeding pipe. The laser welding gun 97 welds the weld seam on the pipe through the driving of the moving bracket 92 by the second linear module 91, the driving of the welding bracket 94 by the welding cylinder 93, and the coordinated cooperation of the wire feeding joint 96.

[0076] The present invention also relates to a welding method for a pipe straight seam welding system, including the following operation steps:

[0077] S1. Place the pipe to be welded on the binding strap 37, and calibrate the weld seam through a red light one-dimensional line lamp.

[0078] S2. The third cylinder 61 is started. The third cylinder 61 drives the hook bracket 62. The hook groove 64 of the clamping plate 63 on the hook bracket 62 is disengaged from the connecting block 23 on the hanging arm 2 and rotates above the frame 11.

[0079] S3. The first cylinder 41 is started. The first cylinder 41 drives the outer centering bracket 42 externally. After the outer centering tool 43 is inserted into the weld seam of the pipe, the second cylinder 51 is started. The second cylinder 51 drives the inner centering bracket 52 internally, and the inner centering tool 53 is inserted into the welding gap between the key connecting plates 82.

[0080] S4. After the feeding detection sensor detects the pipe, the feeding motor 31 starts. The feeding motor 31 drives the feeding chassis 32 and the pipe on the feeding chassis 32 to feed. The outer centering knife 43 resets after completely passing through the weld during the pipe feeding. The inner centering knife 53 enters the weld, and at the same time, the hanging arm 2 extends into the pipe.

[0081] S5. After the pipe feeding is completed, the feeding motor 31 stops, and the third cylinder 61 is controlled to start. The third cylinder 61 drives the hook support 62. After the hook groove 64 of the clamping plate 63 on the hook support 62 is connected to the connecting block 23 on the hanging arm 2, the hanging arm 2 is supported.

[0082] S6. The first linear module 72 starts. The first linear module 72 drives the pushing pipe block 73. The pushing pipe block 73 drives the pushing pipe plate 74 to push one end of the pipe. When the other end of the pipe presses against the limiting plate 66 of the limiting pressure block 65, the first linear module 72 drives the pushing pipe block 73 and the pushing pipe plate 74 to reset.

[0083] S7. The side motor 34 on either side starts. The side motor 34 drives the corresponding pressing support 33 to press one side of the pipe. After the pressing is completed, the pressing airbag 85 on the corresponding side is inflated to press the upper end of the pipe.

[0084] S8. The second cylinder 51 drives the inner centering support 52 to reset. During the reset process of the inner centering knife 53, it disengages from the weld and the welding gap. The second cylinder 51 stops driving after the inner centering knife 53 is reset.

[0085] S9. The pressing airbag 85 on the other side is inflated to press the upper end of the pipe. After the pressing is completed, the side motor 34 on the other side starts. The side motor 34 drives the corresponding pressing support 33 to press the pipe.

[0086] S10. After the pressing is completed, each side motor 34 drives each pressing support 33 to reset and stops driving after the reset. At the same time, each support motor 35 drives each support shaft 36 to rotate synchronously and in opposite directions to support the bottom of the pipe and ensure that the height of the pipe remains unchanged.

[0087] S11. The second linear module 91 and the welding cylinder 93 start. While the laser welding torch 97 welds the weld, a shielding gas is introduced into the welding groove 241 in the connecting copper bar.

[0088] After welding is completed, S12, the second linear module 91, and the welding cylinder 93 drive the laser welding gun 97 to reset and then stop driving. Each pressing airbag 85 deflates, and the third cylinder 61 is activated. The third cylinder 61 drives the hook bracket 62. The hook groove 64 of the clamping plate 63 on the hook bracket 62 disengages from the connecting block 23 on the hanging arm 2. After rotating above the frame 11, the feeding motor 31 is activated. The feeding motor 31 drives the feeding chassis 32 to reset and then stop driving. After the feeding chassis 32 resets, the welded pipe is taken out.

[0089] After the pipes are placed on the respective straps 37, each support motor 35 drives the support shaft 36, and each strap 37 rotates in the same or opposite direction driven by the support shaft 36.

[0090] Each support motor 35 drives each support to rotate in the same direction through the drive of the support shaft 36. Each strap 37 rotates in the same direction through each support shaft 36 and drives the pipe to rotate until the weld coincides with the light of the red light linear lamp.

[0091] Each support motor 35 drives each support to rotate synchronously in the opposite direction through the drive of the support shaft 36. Each strap 37 drives the pipe to move up and down through the reverse rotation of each support shaft 36.

[0092] The present invention also relates to an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above welding method is implemented.

[0093] The present invention also relates to a computer-readable storage medium. A computer program is stored in the computer-readable storage medium. When the computer program is executed by a processor, the above welding method is implemented.

[0094] Working principle of the present invention: During the operation of the present invention, the operator can first place the pipe on each strap 37, and flatten the two ends of the weld before placing each pipe in the strap 37 to avoid height differences at both ends of the weld, which in turn affects the flatness of the subsequent welding. Then turn on the red light line lamp, and use the light of the red light line lamp as a reference to adjust the position of the weld on the pipe. During the adjustment process, each support motor 35 drives the support shaft 36. If the diameter of the pipe is too large or too small, the height of the pipe can be adjusted by driving the support shaft 36 in different directions through each support motor 35. If the light of the red light line lamp hits the side wall of the pipe and does not pass through the weld, the support motor 35 drives each support shaft 36 Drive, so that the rotation directions of each support shaft 36 are the same, thereby driving the pipe to adjust the weld position. After the weld position adjustment is completed, the third cylinder 61 drives the hook bracket 62 to drive, so that the groove on the clamping plate 63 on the hook bracket 62 is disengaged from the connecting block 23, so that the hook bracket 62 is rotated to be higher than the pressing top surface, to avoid the feeding base frame 32 from colliding with the hook bracket 62 during the feeding process. The first cylinder 41 drives the outer centering bracket 42, and the outer centering knife 43 on the outer centering bracket 42 is stuck in the weld. The outer centering knife 43 has rollers on both sides, and each roller is pressed against both sides of the weld. At the same time, the second cylinder 51 drives the inner centering bracket 52 to rotate, so that the inner centering knife 53 on the inner centering bracket 52 and the outer centering knife 43 on the outer centering bracket 42 are arranged coplanarly;

[0095] The feeding motor 31 drives the feeding chassis 32 to start feeding, the outer centering knife 43 passes through the weld on the pipe, the inner centering knife 53 enters the weld of the pipe, and the hanging arm 2 extends into the pipe at the same time. After the pipe completely enters the frame 11, the feeding chassis 32 stops feeding, and then the third cylinder 61 drives the hook bracket 62 to drive, so that the groove on the clamping plate 63 on the hook bracket 62 is hooked with the connecting block 23 again, and supports the hanging arm 2 and the pipe on the hanging arm 2. The first linear module 72 drives the pushing block 73 and the pushing plate 74 on the pushing block 73 to push one end of the pipe, and pushes the other end of the pipe to be pressed against the limit pressure block 65 for positioning, then stops and resets, and the axial positioning of the pipe is completed;

[0096] Then, the side motors 34 on either side drive the pressing brackets 33. The pressing grooves on the pressing brackets 33 and the straps 37 press against one side of the pipe. Then, the pressing airbags 85 on the same side start to inflate. Driven by the pressing airbags 85, each key pressing plate 83 presses against the flattened end face of the pipe. At the same time, the pipe forms a surface contact with the pressing plane 242 of the welding copper bar 24. After the pressing is completed, the second cylinder 51 drives the inner centering bracket 52 to rotate, so that the inner centering knife 53 on the inner centering bracket 52 is reset. After the reset is completed, the pressing airbags 85 on the other side start to inflate. Each key pressing plate 83 on the other side presses against the flattened end face on the other side of the pipe. Then, the pressing bracket 33 on the other side presses against the pipe after being pressed by the key pressing plates 83 through the drive of the side motor 34. After the pressing is completed, the pressing brackets 33 on both sides are reset through the drive of their respective side motors 34, thus avoiding excessive stress on both sides of the weld. After the positioning of the pipe is completed, the second linear module 91 drives the moving bracket 92 to align the wire feeding joint 96 and the laser welding gun 97 with the weld for welding. During the welding process, a shielding gas is introduced through the cooperation of the air holes at the bottom of the welding groove 241 and an external air pump. The shielding gas is generally set as argon;

[0097] After the welding of the pipe is completed, each pressing airbag 85 deflates so that the key pressing plates 83 no longer press on the pipe. The third cylinder 61 drives the hook bracket 62, so that the groove on the clamping plate 63 on the hook bracket 62 disengages from the connecting block 23, and the hook bracket 62 rotates to a position higher than the pressing top surface. The feeding motor 31 drives the feeding bottom frame 32 to discharge the material. After the discharging is completed, the flattened pipe is roundized to ensure the roundness of the pipe.

[0098] The structure of the present utility model is ingenious. After the pipe is manually placed, the positioning of the weld on the pipe, the feeding of the pipe, the limiting pressing, the positioning pressing, the laser welding and the discharging are carried out in an automated manner, effectively solving the problems of low efficiency and poor quality caused by manual welding in the prior art, and being efficient and convenient.

[0099] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A straight seam welding system for pipes, comprising a working platform and a frame fixed on the working platform, characterized in that: The working platform is provided with a feeding station, a calibration station and a welding station. The feeding station is provided with a feeding mechanism and an external centering mechanism capable of feeding and clamping and positioning the pipe. The calibration station is provided with an internal centering mechanism, a hanging arm fixed on the frame and capable of extending into the pipe to support the pipe when the pipe is fed, a hook mechanism capable of being cooperatively connected with the hanging arm, a pipe pushing mechanism capable of pushing and positioning the pipe on the hanging arm, and a piano key pressing plate mechanism oppositely arranged on the frame and capable of pressing against the top of the pipe. The welding station is provided with a laser welding mechanism capable of welding the weld on the pipe. The feeding mechanism and the pipe pushing mechanism are respectively arranged on both sides of the frame. The feeding mechanism feeds the pipe after the hook mechanism is disengaged from the hanging arm. When the pipe on the feeding mechanism is fed, the external centering mechanism and the internal centering mechanism cooperate to align the seams. The hook mechanism resets after the pipe enters the welding station and supports the pipe through cooperation with the hanging arm. The pipe pushing mechanism resets after pushing and positioning the pipe. The feeding mechanism is provided with oppositely and slidably arranged side pressing components, and each side pressing component corresponds to each piano key pressing plate mechanism. The side pressing components on both sides sequentially press against the sides of the pipe through cooperation with the corresponding piano key pressing plate mechanisms. Each side pressing component resets after the piano key pressing plate mechanisms press both sides of the weld. The laser welding mechanism welds the pipe after the pipe is positioned.

2. The pipe straight seam welding system according to claim 1, characterized in that: The feeding mechanism includes a feeding bottom frame and a feeding motor fixed on the feeding bottom frame and capable of driving the feeding bottom frame to slide on the working platform. Each side pressing component is slidably arranged on the feeding bottom frame. The side pressing component includes a side motor fixed on the feeding bottom frame and a pressing support slidably arranged on the feeding bottom frame under the drive of the side motor. The moving direction of the pressing support is perpendicular to the moving direction of the feeding bottom frame. The pressing support includes a pressing bottom plate, a pressing top plate, a plurality of pressing side plates evenly distributed along the moving direction of the feeding bottom frame, and a support component capable of supporting and adjusting the pipe. The upper and lower ends of each pressing side plate are respectively fixed to the pressing bottom plate and the pressing top plate. Each pressing side plate is provided with a pressing notch, and the pressing notches on each pressing side plate form a pressing groove capable of pressing against the side of the pipe. The pressing grooves on each pressing support are oppositely arranged.

3. The straight seam welding system for pipes according to claim 2, characterized in that: The support assembly includes two support motors fixed on the feeding chassis, a support shaft rotatably arranged on the pressing bracket driven by the support motors, a plurality of straps, and a plurality of support bars connecting the respective straps. The axis of the support shaft is arranged parallel to the moving direction of the feeding chassis. The support shaft is rotatably connected to each pressing side plate after passing through each pressing side plate. A support gap is formed between each adjacent pair of pressing side plates, and the support gaps on each pressing bracket correspond one by one. Each strap is arranged in the corresponding support gap. One end of each strap is wound around the support shaft of the corresponding support gap, and the other end of each strap sequentially bypasses the top ends of the pressing top plates on the same side and the top ends of the pressing top plates on the other side and then is wound around the support shaft of the support gap on the other side. Each strap is arranged in parallel, and the extending direction of each support bar is parallel to the axis of the support shaft. The support bars are perpendicular to each strap, and each support bar is fixedly connected to each strap through a locking member.

4. The tube longitudinal welding system according to claim 3, wherein: The outer centering mechanism includes a first cylinder rotatably connected to the frame, an outer centering bracket rotatably connected to the frame, an outer centering knife fixed on the outer centering bracket and capable of being inserted into the weld seam, a red light one-line lamp fixed on the frame and capable of calibrating the weld seam, and a feeding detection sensor fixed on the outer centering knife. The telescopic end of the first cylinder is rotatably connected to the outer centering bracket. The rotation axis of the outer centering bracket is arranged perpendicular to the moving direction of the feeding mechanism. The outer centering knife is inserted into the weld seam of the pipe through the drive of the first cylinder on the outer centering bracket and the coordinated cooperation with the red light one-line lamp, and the feeding of the pipe is sensed by the feeding detection sensor.

5. The pipe butt welding system according to claim 4, wherein: The inner centering mechanism includes a plurality of second cylinders fixed on the frame, an inner centering bracket rotatably connected to the frame driven synchronously by each second cylinder, and an inner centering knife fixed on the inner centering bracket. The telescopic end of each second cylinder is rotatably connected to the inner centering bracket. The rotation direction of the inner centering bracket is perpendicular to the rotation direction of the outer centering bracket. The centering knife on the inner centering bracket extends into the relative piano key pressing plate mechanism under the drive of the second cylinder and is arranged coplanarly with the outer centering knife extending into the weld seam under the drive of the first cylinder.

6. The pipe straight seam welding system according to claim 5, characterized in that: The hook mechanism includes a third cylinder rotatably connected to the frame, a hook bracket rotatably connected to the frame driven by the third cylinder, and clamping plates oppositely arranged on the hook bracket. The rotation axis of the hook bracket is arranged perpendicular to the moving direction of the feeding mechanism. The hook bracket includes two hook plates oppositely arranged and rotatably connected to the frame, and a connecting plate connecting the two hook plates. The telescopic end of the third cylinder is rotatably connected to any one of the hook plates. The oppositely arranged clamping plates are fixed on the connecting plate. Each clamping plate is provided with a hook groove. A connecting block corresponding to each clamping plate and capable of being inserted into the hook groove is arranged at one end of the hanging arm close to the clamping plate. The hook bracket forms a connection with the hanging arm through the drive of the third cylinder and the insertion and cooperation of each hook groove with the connecting wheel, and supports the hanging arm.

7. The pipe butt welding system according to claim 6, characterized in that: The hook groove is successively provided with a guiding inclined surface for guiding the connecting block to be imported into or exported from the hook groove, a pressing arc surface for pressing the connecting block, and an anti - detachment surface. The hook groove forms a hook connection with the connecting block through the driving of the third air cylinder on the hook bracket. After the connecting block is connected to the hook groove, the pressing arc surface forms a surface contact with the connecting block, and the anti - detachment surface forms a line contact with the connecting block.

8. The straight seam welding system for pipes according to claim 7, wherein: The push - tube mechanism includes a push - tube bracket fixed on the working platform, a first linear module fixed on the push - tube bracket, a push - tube block slidably arranged on the first linear module driven by the first linear module, and push - tube plates oppositely arranged on the push - tube block. The moving direction of the push - tube block is parallel to the extending direction of the hanging arm. The hanging arm is provided with limit sliding grooves corresponding to each push - tube plate. The connecting plate is provided with limit pressing blocks for limiting and pressing the pipe. Each push - tube plate pushes the pipe on the hanging arm to press against the limit pressing blocks through the driving of the first linear module on the push - tube block and the sliding fit with the limit sliding grooves.

9. The pipe straight seam welding system according to claim 8, wherein: The key - type pressing plate mechanism includes a key - type connecting rod rotatably connected to the frame, a key - type connecting plate arranged parallel to the key - type connecting rod, a plurality of key - type pressing plates evenly distributed along the extending direction of the key - type connecting rod, and a pressing air bag. The key - type connecting rod and the key - type connecting plate are both parallel to the hanging arm. The rotation axis of the key - type connecting rod is parallel to the extending direction of the key - type connecting rod. The two ends of each key - type pressing plate are respectively fixed to the key - type connecting rod and the key - type connecting plate, and the key - type connecting plate is fixed to the bottom surface of each key - type pressing plate. The frame is also provided with a limit bottom plate, which is located between the frame and each key - type pressing plate. The pressing air bag is arranged between the limit bottom plate and each key - type pressing plate. Each key - type pressing plate is provided with a vertically arranged limit connecting rod at its upper end. Each limit connecting rod passes through the limit bottom plate and is slidably connected to the limit bottom plate. A buffer spring is sleeved on each limit connecting rod, and each buffer spring is located at the upper end of the limit bottom plate. The two ends of each buffer spring act between the limit bottom plate and the corresponding limit connecting rod respectively. Each key - type pressing plate presses the pipe through the inflation of the pressing air bag, and after the pressing air bag deflates, it is reset through the sliding fit of each limit connecting rod and the limit bottom plate and the continuous force application of the buffer spring. A welding gap is formed between the key - type connecting plates on the oppositely arranged key - type pressing plate mechanisms.

10. The pipe butt welding system according to claim 9, wherein: The hanging arm is provided with an installation groove parallel to the welding gap. A welding copper bar is installed in the installation groove. The upper end of the welding copper bar is provided with a horizontally arranged pressing plane that can form a surface contact with the pipe. The upper end of the welding copper bar is also provided with a welding groove parallel to the extending direction of the welding copper bar. The bottom of the welding groove is provided with a plurality of air holes for introducing protective gas.

11. The pipe butt welding system according to claim 10, wherein: One end of each key - type connecting plate close to the limit pressing block is provided with an avoidance groove. The limit pressing block is provided with a limit plate corresponding to each avoidance groove. Each limit plate rotates and limits the hook bracket through the clamping fit with the avoidance groove.

12. The pipe longitudinal welding system according to claim 11, characterized in that: The laser welding mechanism includes a second linear module fixed on the frame, a moving bracket slidably arranged on the second linear module under the drive of the second linear module, a welding cylinder arranged on the moving bracket, a welding bracket arranged on the moving bracket and lifted and lowered under the drive of the welding cylinder, a wire feeding joint arranged on the welding bracket, and a laser welding gun arranged on the welding bracket. The second linear module is arranged parallel to the first linear module. A wire reel for winding welding wire and a wire welding machine adapted to the wire reel are arranged on the frame. The wire welding machine is connected to the wire feeding joint through a wire feeding pipe. The laser welding gun welds the weld seam on the pipe through the drive of the second linear module on the moving bracket, the drive of the welding cylinder on the welding bracket, and the coordinated cooperation of the wire feeding joint.

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