Large-scale straight seam internal welding submerged arc welded pipe forming machine and forming method

Abstract

The present invention discloses a large straight seam internal welding submerged arc welding pipe forming machine, wherein an electric welder, a flux drying machine and a flux recovery machine are arranged above the bracket, a welding plate is arranged on the support, a lifting device is arranged at one end of the cross beam below the bracket, a welding head is arranged at the other end of the cross beam, a flux recovery port, a flux outlet, welding wire outlet 1 and welding wire outlet 2 are arranged on the welding head, welding wire outlet 1 and welding wire outlet 2 are provided with welding wire guide devices, a guide pipe is arranged on the cross beam, one end of the guide pipe is connected with welding wire outlet 1 and welding wire outlet 2; the flux recovery port is connected with the flux recovery machine through the recovery pipe, and the flux outlet is connected with the flux drying machine through the conveying pipe; a moving device for supporting the pipe blank is arranged on the ground, and a grounding device is arranged on the ground. The present invention adopts the above-mentioned large straight seam internal welding submerged arc welding pipe forming machine and forming method, which can solve the problem that the existing forming equipment cannot adapt to the welding needs of large-diameter and large-wall thickness straight seam steel pipes.

Description

Technical Field

[0001] The invention relates to the technical field of submerged arc welding, in particular to a large-scale straight seam internal welding submerged arc welded pipe forming machine and a forming method. Background Art

[0002] The preparation of large steel pipes is to gradually bend steel plates into cylindrical steel pipes on a bending machine. After bending, the steel pipe has a straight seam between its two ends. Later, the straight seam needs to be filled and welded by welding to form a complete steel pipe structure. Existing welding equipment can only meet the welding of small steel pipes. Due to the large size and heavy weight of large steel pipes, existing welding equipment cannot weld the straight seams of large steel pipes. Summary of the invention

[0003] The purpose of the present invention is to provide a large-scale straight seam internal welding submerged arc welded pipe forming machine to solve the problem that the existing forming equipment cannot meet the needs of welding large-diameter and thick-walled straight seam steel pipes. Another purpose of the present invention is to provide a forming method of the large-scale straight seam internal welding submerged arc welded pipe forming machine.

[0004] To achieve the above-mentioned purpose, the present invention provides a large-scale straight seam internal welding submerged arc welding pipe forming machine, comprising a bracket, an electric welding machine, a flux drying machine and a flux recovery machine are arranged above the bracket, a support is arranged on one side of the bracket, a welding pad is arranged on the support, a crossbeam is arranged below the bracket, a lifting device for driving the crossbeam to rise and fall is arranged at one end of the crossbeam, a welding head is arranged at the other end of the crossbeam, a flux recovery port and a flux outlet are arranged on the welding head, a welding wire outlet 1 and a welding wire outlet 2 are arranged between the flux recovery port and the flux outlet, a welding wire guide device is arranged inside the welding wire outlet 1 and the welding wire outlet 2, a guide tube is arranged on the crossbeam for the welding wire on the welding pad to pass through, one end of the guide tube is connected to the welding wire outlet 1 and the welding wire outlet 2; the flux recovery port is connected to the flux recovery machine through the recovery tube, and the flux outlet is connected to the flux drying machine through the conveying pipe; a moving device for supporting the pipe blank is arranged on the ground, and a grounding device is arranged on the ground.

[0005] Preferably, the lifting device includes a workbench, a motor 2 and a reducer are arranged above the workbench, a transmission rod is arranged on the bidirectional reducer output shaft, a reversing gear box is arranged at one end of the transmission rod, worm gears are arranged on the rotating shafts on both sides of the gear box, and the top of the vertical worm meshing with the worm gear is fixedly connected to the crossbeam.

[0006] Preferably, the moving device includes support platform 1 and support platform 2, a group of driving wheels are arranged opposite to each other above support platform 1, the driving wheels are rotatably connected to support platform 1, a motor 1 is arranged on support platform 1 to drive the driving wheels to rotate, and a driven wheel is rotatably arranged above support platform 2; support platform 1 and support platform 2 are connected by a pull rod, a guide rail is arranged on the ground, and a power mechanism is arranged on support platform 2 to drive support platform 2 to move on the guide rail.

[0007] Preferably, the power mechanism includes motor three, a gear is provided on the output shaft of motor three, a rack meshing with the gear is provided on the guide rail, mounting plates are provided on support platform two and both sides of support platform two, and a moving wheel adapted to the guide rail is rotatably provided below the mounting plate.

[0008] Preferably, the welding wire guiding device includes a welding wire tube, which is connected to the guide tube, and a plurality of guide wheels for guiding the welding wire are arranged inside the welding wire tube, the guide wheels are rotatably connected to the welding wire tube, a motor for driving the guide wheels to rotate is arranged on the welding wire tube, and a conical wire outlet nozzle is arranged at the bottom end of the welding wire tube; a positioning wheel is arranged on the welding machine head.

[0009] Preferably, the grounding device includes a support frame arranged on the ground, a slide plate is arranged on the support frame, the slide plate is slidably connected to the support frame through a sliding mechanism, a support beam is arranged on the slide plate, a mounting frame is arranged at one end of the support beam, a cylinder for driving the mounting frame to rise and fall is arranged on the support beam, a grounding brush is arranged below the mounting frame, and the grounding brush is located directly above the pipe blank.

[0010] Preferably, the sliding mechanism includes a motor four, a screw rod is arranged on the output shaft of the motor four, both ends of the screw rod are rotatably connected to the mounting frame, and a transmission nut is arranged on the slide plate, and the transmission nut is sleeved on the outside of the screw rod and meshed with the screw rod.

[0011] The forming method of the large-scale straight seam internal welding submerged arc welded pipe forming machine comprises the following steps:

[0012] S1. Load the flux into the flux dryer for drying; install the welding wire on the support, pass the welding wire through the guide tube on the crossbeam into the welding wire tube, and lead it out from the wire outlet nozzle, the welding wire extends out of the wire outlet nozzle by 15mm-20mm;

[0013] S2, placing the tube blank on the driving wheel and the driven wheel, the motor drives the driving wheel to rotate, thereby rotating the tube blank, and adjusting the weld of the tube blank to the bottom;

[0014] S3, start the motor 3, and the motor 3 drives the tube blank to move from left to right through the meshing of the gear and the rack, until the welding wire outlet 1 and the welding wire outlet 2 are located above the arc starting plate at the left end of the tube blank;

[0015] S4, start motor 4, and stick the grounding brush on the outer surface of the tube blank; start motor 2, and drive the crossbeam downward through the worm gear and worm until the positioning wheel is located in the weld groove, and the welding wire outlet 1, welding wire outlet 2 and the weld are in a straight line;

[0016] S5, start motor three, and motor three drives the tube blank to move to the left through the gear and rack, and adjusts the moving speed of the tube blank according to the welding speed to weld the tube blank.

[0017] Preferably, the wire outlet nozzle is 20 mm-30 mm away from the surface of the tube blank to be welded.

[0018] Preferably, the diameter of the tube blank is 406 mm-1520 mm, the tube wall thickness of the tube blank reaches 100 mm, and the length of the tube blank reaches 12500 mm.

[0019] The advantages and positive effects of the large-scale straight seam internal welding submerged arc welded pipe forming machine and forming method described in the present invention are:

[0020] 1. The present invention provides a welding head at the end of the crossbeam. The length of the welded tube blank is related to the length of the crossbeam. The crossbeam has high rigidity and can meet the welding needs of long-distance tube blanks.

[0021] 2. The crossbeam is located inside the tube blank. The tube blank is welded inside the tube blank, which can meet the welding needs of large diameter tube blanks.

[0022] 3. A flux recovery port is set on the welding machine head to recycle and reuse the flux, reducing flux waste.

[0023] 4. The welding head is provided with welding wire outlet 1 and welding wire outlet 2. The use of double welding wires can meet the welding needs of thick-walled pipe blanks.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a large-scale straight seam internal welding submerged arc welded pipe forming machine and a forming method of the present invention;

[0026] Figure 2 It is a schematic diagram of the top view of the moving device of an embodiment of a large-scale straight seam internal welding submerged arc welded pipe forming machine and forming method of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a welding wire guide device of an embodiment of a large-scale straight seam internal welding submerged arc welded pipe forming machine and forming method of the present invention;

[0028] Figure 4It is a schematic diagram of the structure of a grounding device of an embodiment of a large-scale straight seam internal welding submerged arc welded pipe forming machine and a forming method of the present invention;

[0029] Figure 5 The present invention is a schematic diagram of the structure of a lifting device in accordance with an embodiment of a large-scale straight seam internal welding submerged arc welded pipe forming machine and a forming method.

[0030] Reference numerals

[0031] 1. Support; 2. Welding pad; 3. Welding wire; 4. Bracket; 5. Electric welding machine; 6. Flux drying machine; 7. Flux recovery machine; 8. Conveying pipe; 9. Recovery pipe; 10. Crossbeam; 11. Pipe; 12. Welding machine head; 13. Positioning wheel; 14. Flux recovery port; 15. Welding wire outlet 1; 16. Welding wire outlet 2; 17. Flux outlet; 18. Support platform 1; 19. Driving wheel; 20. Motor 1; 21. Driven wheel; 22. Support platform 2; 23. Shifter Driving wheel; 24, pull rod; 25, guide rail; 26, support frame; 27, workbench; 28, motor two; 29, worm; 30, motor three; 31, mounting plate; 32, welding wire tube; 33, guide wheel; 34, wire outlet nozzle; 35, motor four; 36, lead screw; 37, slide plate; 38, transmission nut; 39, support beam; 40, cylinder; 41, mounting frame; 42, grounding brush; 43, reducer; 44, transmission rod; 45, gear box; 46, worm gear. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] Figure 1It is a structural schematic diagram of an embodiment of a large straight seam internal welding submerged arc welded pipe forming machine and a forming method of the present invention. As shown in the figure, a large straight seam internal welding submerged arc welded pipe forming machine includes a bracket 4, and the bracket 4 is fixedly arranged on the bottom surface. An electric welder 5, a flux dryer 6 and a flux recovery machine 7 are arranged above the bracket 4. The flux recovery machine 7 is an existing pulse flux recovery machine 7, which recovers the flux through negative pressure. A flux magnetic separator can also be arranged on the bracket 4 to remove rust and residue in the flux and reuse the recovered flux. A support 1 is arranged on one side of the bracket 4, and the support 1 is fixed on the ground. A welding pad 2 is arranged on the support 1, and the welding pad 2 is rotatably arranged on the support 1, and the support 1 has a supporting function for the welding pad 2.

[0035] Figure 5 The present invention is a schematic diagram of the lifting device structure of a large-scale straight seam internal welding submerged arc welding pipe forming machine and a forming method embodiment. As shown in the figure, a crossbeam 10 is arranged below the bracket 4, and a lifting device for driving the crossbeam 10 to rise and fall is arranged at one end of the crossbeam 10, and a welding machine head 12 is arranged at the other end of the crossbeam 10. The lifting device includes a workbench 27, and the workbench 27 is arranged on the ground. A motor 28 and a reducer 43 are arranged above the workbench 27, and the reducer 43 is a double-output reducer 43. A transmission rod 44 is fixedly arranged on the output shaft of the bidirectional reducer 43, and a reversing gear box 45 is arranged at one end of the transmission rod 44. The gear box 45 contains a bevel gear, and the transmission reversing is realized by meshing the bevel gears. Worm gears 46 are arranged on the rotating shafts on both sides of the gear box 45, and the top of the vertical worm 29 meshing with the worm gear 46 is fixedly connected to the crossbeam 10. The second motor 28 drives the transmission rod 44 to rotate through the reducer 43, and the transmission rod 44 drives the rotating shaft to rotate through the meshing of the bevel gear, thereby driving the worm wheel 46 to rotate, and the worm wheel 46 meshes with the worm 29 to drive the worm 29 to rise or fall, thereby realizing the lifting and lowering of the beam 10. The height of the beam 10 is adjusted by the second motor 28.

[0036] The welding head 12 is provided with a flux recovery port 14 and a flux outlet 17. The flux recovery port 14 is connected to the flux recovery machine 7 through a recovery pipe 9, and the flux outlet 17 is connected to the flux dryer 6 through a delivery pipe 8. The flux dryer 6 delivers the dried flux to the welding position through the flux outlet 17 under pressure. A switch is provided at the flux outlet 17 to adjust the flux delivery amount as needed. The switch can be an existing mechanical switch or an electromagnetic switch.

[0037] A welding wire outlet 15 and a welding wire outlet 2 16 are provided between the flux recovery port 14 and the flux outlet 17, and the welding wires 3 on the two welding pads 2 on the support 1 are respectively led out through the welding wire outlet 1 15 and the welding wire outlet 2 16. A guide tube is provided on the crossbeam 10 for the welding wires 3 on the welding pads 2 to pass through, and one end of the guide tube is connected to the welding wire outlet 1 15 and the welding wire outlet 2 16. The guide tube is fixed on the crossbeam 10 and has a guiding effect on the welding wire 3.

[0038] Figure 3 The present invention is a schematic diagram of the structure of a welding wire guide device of a large-scale straight seam internal welding submerged arc welding pipe forming machine and forming method embodiment. As shown in the figure, a welding wire guide device is arranged inside the welding wire outlet 15 and the welding wire outlet 2 16. The welding wire guide device includes a welding wire tube 32, which is an arc-shaped structure and is used to guide the horizontal welding wire 3 downward. The welding wire tube 32 is connected to the guide tube. A plurality of guide wheels 33 that have a guiding effect on the welding wire 3 are arranged inside the welding wire tube 32, and the guide wheels 33 are rotatably connected to the welding wire tube 32 through bearings. A motor that drives the guide wheels 33 to rotate is arranged on the welding wire tube 32, and the motor drives the guide wheels 33 to rotate to provide power for the movement of the welding wire 3. A conical wire outlet nozzle 34 is arranged at the bottom end of the welding wire tube 32, and the welding wire 3 is led out through the wire outlet nozzle 34. The arrangement of the guide wheels 33 enables the welding wire 3 to be uniformly and stably transmitted from the wire outlet nozzle 34.

[0039] A positioning wheel 13 is provided on the welding head 12 , and the positioning wheel 13 is rotatably connected to the welding head 12 for positioning the welding head 12 .

[0040] Figure 2 The present invention is a schematic diagram of the top view of the structure of the mobile device of a large-scale straight seam internal welding submerged arc welding pipe forming machine and forming method embodiment. As shown in the figure, a mobile device for supporting a pipe blank 11 is arranged on the ground. The mobile device includes a horizontally arranged support platform 18 and a support platform 22. A group of driving wheels 19 are arranged opposite to each other above the support platform 18. The driving wheel 19 is rotatably connected to the support platform 18 through a bearing seat. A motor 20 is arranged on the support platform 18 to drive the driving wheel 19 to rotate. A driven wheel 21 is rotatably arranged above the support platform 22 through a bearing seat. There are two driven wheels 21, which correspond to the driving wheel 19 one by one. The pipe blank 11 is placed between the driving wheel 19 and the driven wheel 21. The motor 20 drives the driving wheel 19 to rotate, thereby driving the pipe blank 11 to rotate, thereby adjusting the position of the weld.

[0041] Support platform 1 18 and support platform 2 22 are connected by a pull rod 24, and the two ends of the pull rod 24 are fixedly connected to support platform 1 18 and support platform 2 22 respectively. Support platform 1 18 and support platform 2 22 keep synchronous movement under the action of the pull rod 24. A guide rail 25 is arranged on the ground, and the guide rail 25 is arranged parallel to the crossbeam 10. A power mechanism for driving support platform 2 22 to move on the guide rail 25 is arranged on support platform 2 22. The power mechanism includes a motor 3 30, and the motor 3 30 is fixedly arranged on support platform 2 22. A gear is arranged on the output shaft of the motor 3 30, and a rack meshing with the gear is arranged on the guide rail 25. Both sides of support platform 2 22 and support platform 2 22 are fixedly provided with mounting plates 31, and a moving wheel 23 adapted to the guide rail 25 is rotatably arranged below the mounting plate 31. The motor 30 drives the gear to rotate, and the gear meshes with the rack, thereby driving the support platform 1 18 and the support platform 2 22 to move on the guide rail 25, thereby driving the tube blank 11 to move along the length direction of the guide rail 25.

[0042] Figure 4 The schematic diagram of the grounding device structure of a large-scale straight seam internal welding submerged arc welding pipe forming machine and forming method embodiment of the present invention. As shown in the figure, a grounding device is arranged on the ground. The grounding device includes a support frame 26 arranged on the ground, and the support frame 26 is located on one side of the guide rail 25. A slide plate 37 is arranged on the support frame 26, and the slide plate 37 is slidably connected to the support frame 26 through a sliding mechanism. A support beam 39 is fixedly arranged on the slide plate 37, and a cylinder 40 for driving the mounting frame 41 to rise and fall is fixedly arranged on the support beam 39, and the mounting frame 41 is fixedly arranged on the telescopic rod of the cylinder 40. A grounding brush 42 is arranged below the mounting frame 41, and the grounding brush 42 is located directly above the tube blank 11.

[0043] The sliding mechanism includes a motor 4 35, which is fixedly arranged at the top of the support frame 26. A screw rod 36 is fixedly arranged on the output shaft of the motor 4 35, and both ends of the screw rod 36 are rotatably connected to the mounting frame 41 through bearings. A transmission nut 38 is fixedly arranged on the slide plate 37, and the transmission nut 38 is sleeved on the outside of the screw rod 36 and meshed with the screw rod 36. The motor 4 35 drives the screw rod 36 to rotate, and the screw rod 36 meshes with the transmission nut 38, thereby driving the support beam 39 to move up and down along the length direction of the screw rod 36, thereby adjusting the height of the grounding brush 42, so that the grounding brush 42 can contact the tube blank 11, achieve the grounding effect, and improve safety. The setting of the cylinder 40 can fine-tune the grounding brush 42 in the vertical direction.

[0044] The forming method of the large-scale straight seam internal welding submerged arc welded pipe forming machine comprises the following steps:

[0045] S1. Load the flux into the flux dryer 6 for drying; install the welding wire 3 on the support 1, pass the welding wire 3 through the guide tube on the crossbeam 10, introduce it into the welding wire tube 32, and lead it out from the wire outlet nozzle 34, and the welding wire 3 extends out of the wire outlet nozzle 34 by 15mm-20mm.

[0046] S2. Place the tube blank 11 on the driving wheel 19 and the driven wheel 21. The motor 20 drives the driving wheel 19 to rotate, thereby rotating the tube blank 11 and adjusting the weld of the tube blank 11 to the bottom.

[0047] S3, start the motor 30, and the motor 30 drives the tube 11 to move from left to right through the meshing of the gear and the rack until the welding wire outlet 1 15 and the welding wire outlet 2 16 are located above the arc-starting plate at the left end of the tube 11.

[0048] S4, start motor four 35, and stick the grounding brush 42 to the outer surface of the tube blank 11; start motor two 28, and drive the crossbeam 10 to move downward through the worm gear 46 and the worm 29 until the positioning wheel 13 is located in the weld groove, and the welding wire outlet one 15, the welding wire outlet two 16 and the weld are in a straight line; the wire outlet nozzle 34 is 20mm-30mm away from the surface of the tube blank 11 to be welded.

[0049] S5, start the motor 30, the motor 30 drives the tube 11 to move to the left through the gear and the rack, adjusts the moving speed of the tube 11 according to the welding speed, and welds the tube 11. The welding speed is 0.3-1.5mm / min.

[0050] The inner diameter of the tube blank 11 that can be welded is 406 mm-1520 mm, the tube wall thickness of the tube blank 11 reaches 100 mm, and the length of the tube blank 11 can reach 12500 mm.

[0051] Example

[0052] This embodiment is described by taking the welding of a steel pipe with an inner diameter of 813 mm, a wall thickness of 30 mm, a length of 12000 mm, and a material of L485 as an example.

[0053] S1. Put CHF101GX flux into flux drying machine 6 and dry it at 300℃-350℃ for 1-2 hours. Install CHW-SG welding wire 3 on support 1, pass the guide tube on beam 10, introduce into welding wire tube 32, and lead out from welding wire outlet 1 15 and welding wire outlet 2 16, and the welding wire 3 extends 15mm-20mm.

[0054] S2. Place the tube blank 11 on the driving wheel 19 and the driven wheel 21. The motor 20 drives the driving wheel 19 to rotate, thereby rotating the tube blank 11 and adjusting the weld of the tube blank 11 to the bottom.

[0055] S3, start the motor 30, and the motor 30 drives the tube 11 to move from left to right through the meshing of the gear and the rack until the welding wire outlet 1 15 and the welding wire outlet 2 16 are located above the arc-starting plate at the left end of the tube 11.

[0056] S4, start motor four 35, and stick the grounding brush 42 to the outer surface of the tube blank 11; start motor two 28, and drive the crossbeam 10 to move downward through the worm gear 46 and the worm 29 until the positioning wheel 13 is located in the weld groove, and the welding wire outlet one 15, the welding wire outlet two 16 and the weld are in a straight line; the wire outlet nozzle 34 is 20mm-30mm away from the surface of the tube blank 11 to be welded.

[0057] S5, start the motor 30, the motor 30 drives the tube 11 to move to the left through the gear and the rack, adjusts the moving speed of the tube 11 according to the welding speed, and welds the tube 11. The welding speed is 0.3-1.5mm / min.

[0058] Therefore, the present invention adopts the above-mentioned large-scale straight seam internal welding submerged arc welding pipe forming machine and forming method, which can solve the problem that the existing forming equipment cannot adapt to the welding needs of large-diameter and large-wall thickness straight seam steel pipes.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A large-scale straight seam internal welding submerged arc welding pipe forming machine, characterized in that: The invention comprises a bracket, an electric welding machine, a flux drying machine and a flux recovery machine are arranged above the bracket, a support is arranged on one side of the bracket, a welding pad is arranged on the support, a crossbeam is arranged below the bracket, a lifting device for driving the crossbeam to rise and fall is arranged at one end of the crossbeam, a welding head is arranged at the other end of the crossbeam, a flux recovery port and a flux outlet are arranged on the welding head, a welding wire outlet 1 and a welding wire outlet 2 are arranged between the welding flux recovery port and the flux outlet, a welding wire guide device is arranged inside the welding wire outlet 1 and the welding wire outlet 2, a guide tube for passing the welding wire on the welding pad is arranged on the crossbeam, one end of the guide tube is connected with the welding wire outlet 1 and the welding wire outlet 2; the flux recovery port is connected with the flux recovery machine through the recovery tube, and the flux outlet is connected with the flux drying machine through the conveying pipe; a moving device for supporting the pipe blank is arranged on the ground, and a grounding device is arranged on the ground; The lifting device includes a workbench, a motor 2 and a reducer are arranged above the workbench, a transmission rod is arranged on the bidirectional reducer output shaft, a reversing gear box is arranged at one end of the transmission rod, worm wheels are arranged on the rotating shafts on both sides of the gear box, and the top end of the vertical worm meshing with the worm wheel is fixedly connected to the crossbeam; The mobile device includes a support platform 1 and a support platform 2, a group of driving wheels are arranged opposite to each other above the support platform 1, the driving wheels are rotatably connected to the support platform 1, a motor 1 is arranged on the support platform 1 to drive the driving wheels to rotate, and a driven wheel is rotatably arranged above the support platform 2; the support platform 1 and the support platform 2 are connected by a pull rod, a guide rail is arranged on the ground, and a power mechanism is arranged on the support platform 2 to drive the support platform 2 to move on the guide rail; The grounding device includes a support frame arranged on the ground, a slide plate is arranged on the support frame, the slide plate is slidably connected to the support frame through a sliding mechanism, a support beam is arranged on the slide plate, a mounting frame is arranged at one end of the support beam, a cylinder for driving the mounting frame to rise and fall is arranged on the support beam, a grounding brush is arranged below the mounting frame, and the grounding brush is located directly above the pipe blank.

2. A large-scale straight seam internal welding submerged arc welding pipe forming machine according to claim 1, characterized in that: The power mechanism includes motor three, a gear is arranged on the output shaft of motor three, a rack meshing with the gear is arranged on the guide rail, mounting plates are arranged on support platform two and both sides of support platform two, and a moving wheel adapted to the guide rail is rotatably arranged under the mounting plate.

3. A large-scale straight seam internal welding submerged arc welding pipe forming machine according to claim 1, characterized in that: The welding wire guiding device comprises a welding wire tube, which is connected with a guide tube, a plurality of guide wheels for guiding the welding wire are arranged inside the welding wire tube, the guide wheels are rotatably connected with the welding wire tube, a motor for driving the guide wheels to rotate is arranged on the welding wire tube, a conical wire outlet nozzle is arranged at the bottom end of the welding wire tube, and a positioning wheel is arranged on the welding machine head.

4. A large-scale straight seam internal welding submerged arc welding pipe forming machine according to claim 1, characterized in that: The sliding mechanism comprises a motor 4, a screw rod is arranged on the output shaft of the motor 4, two ends of the screw rod are rotatably connected with the mounting frame, a transmission nut is arranged on the slide plate, and the transmission nut is sleeved on the outside of the screw rod and meshed with the screw rod.

5. A forming method for a large-scale straight seam internal welding submerged arc welded pipe forming machine according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Load the flux into the flux dryer for drying; install the welding wire on the support, pass the welding wire through the guide tube on the crossbeam into the welding wire tube, and lead it out from the wire outlet nozzle, the welding wire extends out of the wire outlet nozzle by 15mm-20mm; S2, placing the tube blank on the driving wheel and the driven wheel, the motor drives the driving wheel to rotate, thereby rotating the tube blank, and adjusting the weld of the tube blank to the bottom; S3, start the motor 3, and the motor 3 drives the tube blank to move from left to right through the meshing of the gear and the rack, until the welding wire outlet 1 and the welding wire outlet 2 are located above the arc starting plate at the left end of the tube blank; S4, start motor 4, and stick the grounding brush on the outer surface of the tube blank; start motor 2, and drive the crossbeam downward through the worm gear and worm until the positioning wheel is located in the weld groove, and the welding wire outlet 1, welding wire outlet 2 and the weld are in a straight line; S5, start motor three, and motor three drives the tube blank to move to the left through the gear and rack, and adjusts the moving speed of the tube blank according to the welding speed to weld the tube blank.

6. The forming method of a large-scale straight seam internal welding submerged arc welded pipe forming machine according to claim 5, characterized in that: The wire outlet nozzle is 20mm-30mm away from the surface of the tube blank to be welded.

7. The forming method of a large-scale straight seam internal welding submerged arc welded pipe forming machine according to claim 5, characterized in that: The diameter of the tube blank is 406mm-1520mm, the tube wall thickness of the tube blank reaches 100mm, and the length of the tube blank reaches 12500mm.

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