CN217342899U - Large-scale longitudinal welded pipe planer-type make-up machine of bending - Google Patents

Abstract

The utility model discloses a large straight welded pipe gantry type bending forming machine, which comprises upright columns, wherein an upper cross beam is arranged above the two upright columns, a lower cross beam is arranged below the upright columns, a workbench is arranged between the upper cross beam and the lower cross beam, and two sides of the workbench are provided with a conveying device; a sliding block is arranged below the upper cross beam, two ends of the sliding block are sleeved on the stand column and are in sliding connection with the stand column, and the sliding block is connected with the upper cross beam through a power element which drives the sliding block to slide up and down along the stand column; a connecting plate is arranged on the sliding block, an upper die is arranged at the bottom end of the connecting plate, and a lower die matched with the upper die is arranged in the middle of the workbench; the lower beam is provided with a plurality of supporting mechanisms for supporting the steel plate. The utility model adopts the above-mentioned large-scale transversal joint pipe planer-type make-up machine of bending can solve the problem that current make-up machine can not prepare heavy-calibre, thick wall, long welded tube.

Description

Large-scale longitudinal welded pipe planer-type make-up machine of bending

Technical Field

The utility model belongs to the technical field of the welded tube shaping technique and specifically relates to a large-scale welded tube planer-type make-up machine of bending is related to.

Background

Straight welded pipes are steel pipes made by hot-rolling or cold-rolling steel sheets or coil welding steel strips, and pipes obtained by straight welding on a welding apparatus are called straight welded pipes. The steel plate for producing the straight welded pipe is rolled and bent into a circular pipe structure by the forming roller, the forming mode is relatively quick, but the forming mode can only be suitable for producing the small-caliber and thin-wall straight welded pipe and cannot meet the production of large-caliber, thick-wall and long welded pipes. And the structure of this kind of equipment is more complicated, needs to separate the shaping roller after bending, and the steel pipe after the shaping needs to drag out with the help of external force, causes the mar easily on the steel pipe outer wall.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a large-scale longitudinal welded pipe planer-type make-up machine of bending solves the problem that current make-up machine can not prepare heavy-calibre, thick wall, long welded tube.

In order to achieve the purpose, the utility model provides a gantry type bending forming machine for large straight welded pipes, which comprises upright columns, wherein an upper cross beam is arranged above the two upright columns, a lower cross beam is arranged below the upright columns, a workbench is arranged between the upper cross beam and the lower cross beam, and two sides of the workbench are provided with a conveying device; a sliding block is arranged below the upper cross beam, two ends of the sliding block are sleeved on the stand column and are in sliding connection with the stand column, and the sliding block is connected with the upper cross beam through a power element which drives the sliding block to slide up and down along the stand column; a connecting plate is arranged on the sliding block, an upper die is arranged at the bottom end of the connecting plate, and a lower die matched with the upper die is arranged in the middle of the workbench; the lower beam is provided with a plurality of supporting mechanisms for supporting the steel plate.

Preferably, the power element is a forming hydraulic cylinder, the number of the forming hydraulic cylinders is 6, the 6 forming hydraulic cylinders are uniformly arranged on the upper cross beam, the forming pressure of the forming hydraulic cylinders in synchronous operation is not less than 100MN, and the working pressure of the forming hydraulic cylinders is not less than 27 MPa.

Preferably, the effective working length of the workbench is not less than 12600 mm.

Preferably, the connecting plate is a trapezoidal structure with a large top end size and a small bottom end size.

Preferably, the workstation below is provided with oblique wedge type amount of deflection compensation arrangement, and oblique wedge type amount of deflection compensation arrangement includes motor three and reduction gear, the fixed lead screw that is provided with on the output shaft of reduction gear, the lead screw passes through the bearing rotation with workstation one end and is connected, the cover is equipped with the connecting seat on the lead screw, be provided with on the connecting seat make the lead screw pass and with the screw hole of lead screw looks adaptation, the fixed wedge that is provided with on the connecting seat, through connecting rod fixed connection between the adjacent wedge, the fixed block has been placed on the slope upper surface of wedge, fixed block and workstation fixed connection.

Preferably, the conveying device comprises conveying rollers arranged on one side of the workbench and used for conveying, a plurality of brackets are arranged between the conveying rollers and connected with the workbench, sliding rails are arranged on two sides of the workbench, and a feeding mechanism is arranged on the sliding rails.

Preferably, the feeding mechanism comprises a first motor and a double-output speed reducer, the double-output speed reducer is connected with a screw-nut pair power unit arranged on a slide rail through a coupling, a nut is arranged on a slide seat, the slide seat is in sliding connection with the slide rail, an installation seat is fixedly arranged in the slide seat, a telescopic hydraulic cylinder is arranged on the installation seat, a fixed plate is arranged on a telescopic rod of the telescopic hydraulic cylinder, a discharge roller is rotatably arranged on the fixed plate, and a second motor and a speed reduction box which drive the discharge roller to rotate are arranged on the fixed plate; the fixing plate is provided with a guide post which has a guiding effect on the sliding of the fixing seat, and the mounting seat is provided with a through hole through which the guide post passes.

Preferably, the supporting mechanism comprises a supporting table, one end of the supporting table is hinged to two sides of the lower cross beam, the middle of the supporting table is connected with the lower cross beam through a supporting hydraulic cylinder, and two ends of the supporting hydraulic cylinder are hinged to the lower cross beam and the supporting table respectively.

The forming method of the large straight welded pipe gantry bending forming machine comprises the following steps:

s1, conveying the plate to a bracket through a conveying roller;

s2, starting to work by a motor, driving a screw rod of a screw rod nut pair to rotate by the motor through a coupler so as to drive a feeding mechanism to slide on a sliding rail, and pushing a plate material to a workbench by the feeding mechanism;

s3, the forming hydraulic cylinder starts to work, the connecting plate and the upper die are driven to press downwards through the sliding block, and one side of the plate is pre-bent;

s4, when the motor is started, the feeding mechanism pushes the plate to move transversely on the workbench, the feeding mechanism on the other side of the workbench positions the plate, and the upper die pre-bends the other side of the plate;

s5, adjusting a wedge type deflection compensation device below the workbench to adjust deflection compensation of the workbench and ensure forming of the steel pipe;

s6, gradually bending and forming the pre-bent plate until the forming is finished, and manufacturing a pierced billet;

s7, extending the telescopic hydraulic cylinder to push the discharge roller out of the sliding seat, clamping the pierced billet by the discharge rollers on two sides of the workbench, and driving the discharge rollers to rotate by the motor II through the reduction gearbox, so that the pierced billet moves in the middle of the workbench and moves out of the end of the workbench to the next process.

Preferably, the diameter of the prepared straight welded pipe is not less than 406mm, and the outer diameter reaches 1520 mm; the wall thickness of the longitudinal welded pipe reaches 100 mm; the length of the straight welded pipe reaches 12500 mm.

Large-scale longitudinal welded pipe planer-type make-up machine of bending advantage and positive effect be:

1. the utility model discloses be provided with 6 shaping pneumatic cylinders on the entablature, shaping pneumatic cylinder synchronous working's shaping pressure is not less than 100MN, and shaping pneumatic cylinder's operating pressure is not less than 27MPa, satisfies the production of bending of thick wall major diameter steel pipe. The effective working length of the workbench is not less than 12600mm, and the bending and forming requirements of the longer steel pipe are met.

2. The synchronous operation of preflex and bending on the workstation, must independent operation of preflex again, reduced the removal of steel sheet, be favorable to improving the efficiency of work.

3. The conveying devices are arranged on the two sides of the workbench, the steel plates are fed through the conveying devices, the steel pipes are discharged through the discharge rollers, and feeding and discharging are convenient.

4. Set up supporting mechanism on the bottom end rail, support the steel sheet through supporting mechanism, reduce impact and the vibrations of steel sheet bending in-process impact force to the organism.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic front view of an embodiment of a gantry bending forming machine for large straight welded pipes according to the present invention;

fig. 2 is a schematic structural view of a conveying device of an embodiment of a gantry type bending forming machine for large straight welded pipes of the present invention;

FIG. 3 is a schematic view of a locally enlarged structure of an embodiment of a gantry type bending forming machine for large straight welded pipes according to the present invention;

fig. 4 is a schematic structural view of a feeding mechanism of an embodiment of a gantry type bending forming machine for large straight welded pipes of the present invention;

fig. 5 is the schematic structural diagram of the wedge-type deflection compensation device of the gantry bending forming machine for large straight welded pipes of the present invention.

Reference numerals

1. A column; 2. an upper cross beam; 3. a lower cross beam; 4. a work table; 5. molding a hydraulic cylinder; 6. a slider; 7. a connecting plate; 8. an upper die; 9. a feeding mechanism; 10. a support table; 11. a support hydraulic cylinder; 12. a conveying roller; 13. a bracket; 14. a first motor; 15. a coupling; 16. a slide rail; 17. a lower die; 18. a slide base; 19. a mounting base; 20. a telescopic hydraulic cylinder; 21. a fixing plate; 22. a discharging roller; 23. a second motor; 24. a reduction gearbox; 25. a third motor; 26. a speed reducer; 27. a connecting seat; 28. a screw rod; 29. a wedge block; 30. a fixed block; 31. a connecting rod.

Detailed Description

The technical solution of the present invention is further explained by the accompanying drawings and examples.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Fig. 1 is the utility model relates to a structural schematic drawing is looked just to large-scale transversal joint pipe planer-type make-up machine embodiment of bending, fig. 3 is the utility model relates to a structural schematic drawing is enlargied to local of large-scale transversal joint pipe planer-type make-up machine embodiment of bending. As shown in the figure, the gantry type bending forming machine for the large straight seam welded pipe comprises two upright columns 1, wherein the two upright columns 1 are oppositely fixed on the ground. The upper cross beam 2 is arranged above the two upright posts 1, the lower cross beam 3 is arranged below the upright posts 1, the upper cross beam 2 and the lower cross beam 3 are arranged in parallel, and the two ends of the upper cross beam 2 and the lower cross beam 3 are fixedly connected with the two upright posts 1. A workbench 4 is arranged between the upper cross beam 2 and the lower cross beam 3, and the workbench 4 is fixed on the bottom surface. The workbench 4 is arranged in parallel with the upper cross beam 2 and the lower cross beam 3.

The below of entablature 2 is provided with slider 6, and the both ends cover of slider 6 is established on stand 1 and with stand 1 sliding connection. The sliding block 6 is connected with the upper beam 2 through a power element which drives the sliding block 6 to slide up and down along the upright post 1. The power component is a forming hydraulic cylinder 5, and 6 forming hydraulic cylinders 5 are arranged. 6 even setting of shaping pneumatic cylinder 5 is on entablature 2, and shaping pneumatic cylinder 5's telescopic link and 6 fixed connection of slider. A connecting plate 7 is fixedly arranged on the sliding block 6, and an upper die 8 is fixedly arranged at the bottom end of the connecting plate 7. Go up mould 8 and set up along the length direction of workstation 4 to go up mould 8 and keep parallel with workstation 4 all the time, the length of connecting plate 7 and last mould 8 is all not less than the length of steel sheet. The connecting plate 7 is a trapezoidal structure with a large top end size and a small bottom end size, and the strength of the connecting plate 7 is improved. The forming pressure of the forming hydraulic cylinder 5 working synchronously is not less than 100MN, the working pressure of the forming hydraulic cylinder 5 is not less than 27MPa, and the bending production of the thick-wall large-diameter steel pipe is met.

Fig. 5 is the schematic structural diagram of the wedge-type deflection compensation device of the gantry bending forming machine for large straight welded pipes of the present invention. As shown in the figure, the middle of the working table 4 is provided with a lower die 17 matched with the upper die 8. A full-length wedge type deflection compensation device is arranged below the workbench 4, and the wedge type deflection compensation device is positioned right below the lower die 17. The wedge type deflection compensation device comprises a motor III 25 and a speed reducer 26, wherein a screw rod 28 is fixedly arranged on an output shaft of the speed reducer 26, and the screw rod 28 is rotatably connected with one end of the workbench 4 through a bearing. The screw 28 is sleeved with a connecting seat 27, and the connecting seat 27 is provided with a threaded hole which enables the screw 28 to penetrate through and is matched with the screw 28. The connecting seat 27 is fixedly provided with wedge blocks 29, the adjacent wedge blocks 29 are fixedly connected through a connecting rod 31, a fixing block 30 is placed on the inclined upper surface of each wedge block 29, and the fixing block 30 is fixedly connected with the workbench 4. The third motor 25 drives the screw rod 28 to rotate through the speed reducer 26, the screw rod 28 is meshed with the connecting seat 27, so that the connecting seat 27 slides on the screw rod 28, the connecting seat 27 drives the wedge block 29 to synchronously slide along the length direction of the workbench 4, and the upper surface of the wedge block 29 is an inclined surface, so that the fixing block 30 is driven to move up and down through the sliding of the wedge block 29, the workbench 4 is changed into an inclined surface or a plane, and the deflection compensation is performed on the workbench 4. The effective working length of the working table 4 is not less than 12600mm, and the bending and forming requirements of the longer steel pipe are met.

Fig. 2 is the schematic structural diagram of the conveying device of the gantry type bending forming machine for large straight welded pipes of the present invention. As shown, the table 4 is provided with conveyors on both sides. The conveying device comprises a conveying roller 12 which is arranged on one side of the workbench 4 and used for conveying, and a plurality of conveying rollers 12 are arranged in parallel. The conveying roller 12 can be of an existing structure, and the conveying roller 12 is driven to rotate synchronously in a transmission mode of an existing motor, a chain wheel and a chain and used for conveying steel plates or steel pipes. A plurality of brackets 13 are arranged between the conveying rollers 12, and the brackets 13 are connected with the workbench 4. A plurality of rollers can be rotatably arranged on the bracket 13, so that the steel plate can be conveniently moved.

Fig. 4 is the structural schematic diagram of the feeding mechanism of the gantry type bending forming machine for large straight welded pipes of the present invention. As shown in the figure, two sliding rails 16 are disposed on two sides of the working platform 4, two sliding rails 16 are disposed on one side of the working platform 4, and the sliding rails 16 are fixed on the ground. The slide rail 16 is provided with a feeding mechanism 9. The feeding mechanism 9 comprises a first motor 14 and a double-output speed reducer, and the first motor 14 is connected with the double-output speed reducer. Two output shafts of the double-output speed reducer are respectively connected with a lead screw nut pair power unit with the existing structure arranged on a slide rail 16 through a coupler 15. The screw-nut pair transmission unit comprises a screw rod and a nut, the screw rod is rotatably arranged on the ground, one end of the screw rod can be connected with the coupler 15 through a pair of bevel gears, the first motor 14 can drive the screw rod to rotate through the coupler 15, and the screw rod is meshed with the nut so as to drive the nut to move along the length direction of the screw rod. The nut is fixedly arranged on the slide 18 so that the slide 18 slides synchronously with the nut. Guide rods which have a guiding function on the sliding of the sliding seat 18 can be arranged on two sides of the screw rod, and through holes through which the guide rods can pass are arranged on the sliding seat 18. The slide seat 18 is sleeved on the slide rail 16 and is connected with the slide rail 16 in a sliding manner under the action of the screw rod.

A telescopic hydraulic cylinder 20 is fixedly arranged in the sliding seat 18, the telescopic hydraulic cylinder 20 is fixedly arranged on a mounting seat 19 in the sliding seat 18, and the mounting seat 19 is fixedly connected with the sliding seat 18. The fixed plate 21 is fixedly arranged on a telescopic rod of the telescopic hydraulic cylinder 20, the discharge roller 22 is rotatably arranged on the fixed plate 21 through a bearing, and the discharge roller 22 is of a circular truncated cone structure with a large top diameter and a large bottom diameter. The fixed plate 21 is fixedly provided with a second motor 23 and a reduction gearbox 24 which drive the discharge roller 22 to rotate, the second motor 23 is connected with the reduction gearbox 24, an output shaft of the reduction gearbox 24 is connected with the discharge roller 22, the second motor 23 drives the discharge roller 22 to rotate through the reduction gearbox 24, and the discharge roller 22 provides power for discharging of steel pipes. Two guide posts are further arranged on the fixed plate 21 and located on two sides of the telescopic hydraulic cylinder 20, through holes through which the guide posts penetrate are formed in the mounting base 19, and the guide posts have a guiding effect on sliding of the discharging roller 22.

The lower beam 3 is provided with a plurality of supporting mechanisms for supporting the steel plate. The supporting mechanism comprises a supporting table 10, one end of the supporting table 10 is hinged to the two sides of the lower cross beam 3, the middle of the supporting table 10 is connected with the lower cross beam 3 through a supporting hydraulic cylinder 8, and the two ends of the supporting hydraulic cylinder 8 are hinged to the lower cross beam 3 and the supporting table 10 respectively. A plurality of support rollers are rotatably provided on the upper surface of the support table 10 to reduce friction with the steel plate. Extension through the telescopic link that supports pneumatic cylinder 8, brace table 10 revolves around the pin joint rotation to the bottom of following the steel sheet always supports the steel sheet after the deformation, prevents that the thick wall steel sheet from bending the in-process down impact force too big, and the impact or the vibrations harm that cause the organism are great, influence the life of organism.

In the embodiment, the specification of the steel plate is 2397mm in width, 50mm in thickness and 12500mm in length, and the material is Q235B for preparing a straight slit steel pipe with the diameter of 813mm and the thickness of 50mm by cold extrusion.

The forming method of the large straight welded pipe gantry bending forming machine comprises the following steps:

s1, the sheet is conveyed to the carriage 13 by the conveying rollers 12.

And S2, starting to work by the first motor 14, wherein the first motor 14 drives a screw rod of the screw rod nut pair to rotate through the coupler 15 and the bevel gear pair, so as to drive the sliding seat 18 to slide on the sliding rail 16. During the movement, the slide 18 exerts a thrust force on the steel plate, pushing it onto the worktable 4.

S3, the forming hydraulic cylinder 5 starts to work, the connecting plate 7 and the upper die 8 are driven to press down through the sliding block 6, and one side of the plate is pre-bent firstly under the action of the upper die 8 and the lower die 17.

S4, starting a first motor 14, pushing the plate material to move transversely on the workbench 4 by the sliding base 18 of the feeding mechanism 9, positioning the plate material by the sliding base 18 of the feeding mechanism 9 on the other side of the workbench 4, and pre-bending the other side of the plate material by the forming hydraulic cylinder 5 through the upper die 8 and the lower die 17.

S5, adjusting a wedge type deflection compensation device below the workbench 4, adjusting the deflection compensation of the workbench 4 according to the specification of the steel pipe to be produced, and ensuring the forming of the steel pipe.

And S6, gradually bending and forming the pre-bent plate from one side of the steel plate through the upper die 8 and the lower die 17 until the forming is finished, manufacturing a pierced billet, and moving the upper die 8 out of the opening at the top of the pierced billet.

S7, extending the telescopic hydraulic cylinder 20 to push the discharge roller 22 out of the slide seat 18, driving the slide seat 18 to slide on the slide rail 16 by the first motor 14, enabling the discharge rollers 22 on two sides of the workbench 4 to clamp the pierced billet tightly, driving the discharge rollers 22 to rotate by the second motor 23 through the reduction gearbox 24, enabling the pierced billet to move in the middle of the workbench 4, moving out from the end of the workbench 4 to the next process, and performing operations such as seaming and welding.

By adopting the gantry type bending forming machine and the gantry type bending forming method for the large straight welded pipe, the straight welded pipe with the diameter not less than 406mm and the outer diameter reaching 1520mm can be prepared; the wall thickness of the straight welded pipe reaches 100mm, and the length of the straight welded pipe reaches 12500 mm; the molding requirement of longer large-diameter and thick-wall steel pipes is met.

Therefore, the utility model discloses an above-mentioned large-scale transversal welded pipe planer-type make-up machine of bending can solve the problem that current make-up machine can not prepare heavy-calibre, thick wall, long welded tube.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.

Claims (9)

1. The utility model provides a large-scale longitudinal welded pipe planer-type make-up machine of bending which characterized in that: the device comprises upright posts, wherein an upper cross beam is arranged above the two upright posts, a lower cross beam is arranged below the upright posts, a workbench is arranged between the upper cross beam and the lower cross beam, and conveying devices are arranged on two sides of the workbench; a sliding block is arranged below the upper cross beam, two ends of the sliding block are sleeved on the stand column and are in sliding connection with the stand column, and the sliding block is connected with the upper cross beam through a power element which drives the sliding block to slide up and down along the stand column; a connecting plate is arranged on the sliding block, an upper die is arranged at the bottom end of the connecting plate, and a lower die matched with the upper die is arranged in the middle of the workbench; the lower beam is provided with a plurality of supporting mechanisms for supporting the steel plate.

2. The gantry bending forming machine for large straight welded pipes according to claim 1, characterized in that: the power component is a forming hydraulic cylinder, the number of the forming hydraulic cylinders is 6, the 6 forming hydraulic cylinders are uniformly arranged on the upper cross beam, the forming pressure of the forming hydraulic cylinders in synchronous working is not less than 100MN, and the working pressure of the forming hydraulic cylinders is not less than 27 MPa.

3. The gantry bending forming machine for the large straight welded pipe according to claim 1, wherein: the effective working length of the workbench is not less than 12600 mm.

4. The gantry bending forming machine for the large straight welded pipe according to claim 1, wherein: the connecting plate is of a trapezoidal structure with a large top end size and a small bottom end size.

5. The gantry bending forming machine for the large straight welded pipe according to claim 1, wherein: the utility model discloses a workbench is characterized in that workstation below is provided with oblique wedge type amount of deflection compensation arrangement, oblique wedge type amount of deflection compensation arrangement includes motor three and reduction gear, the fixed lead screw that is provided with on the output shaft of reduction gear, the lead screw passes through the bearing rotation with workstation one end and is connected, the cover is equipped with the connecting seat on the lead screw, be provided with on the connecting seat make the lead screw pass and with the screw hole of lead screw looks adaptation, the fixed wedge that is provided with on the connecting seat, through connecting rod fixed connection between the adjacent wedge, the fixed block has been placed on the slope upper surface of wedge, fixed block and workstation fixed connection.

6. The gantry bending forming machine for large straight welded pipes according to claim 1, characterized in that: the conveying device comprises conveying rollers arranged on one side of the workbench and used for conveying, a plurality of brackets are arranged between the conveying rollers and connected with the workbench, sliding rails are arranged on two sides of the workbench, and a feeding mechanism is arranged on the sliding rails.

7. The gantry bending forming machine for the large straight welded pipe according to claim 6, wherein: the feeding mechanism comprises a first motor and a double-output speed reducer, the double-output speed reducer is connected with a screw-nut pair power unit arranged on a slide rail through a coupler, a nut is arranged on a slide seat, the slide seat is connected with the slide rail in a sliding manner, an installation seat is fixedly arranged in the slide seat, a telescopic hydraulic cylinder is arranged on the installation seat, a fixed plate is arranged on a telescopic rod of the telescopic hydraulic cylinder, a discharge roller is rotatably arranged on the fixed plate, and a second motor and a reduction box which drive the discharge roller to rotate are arranged on the fixed plate; the fixing plate is provided with a guide post which has a guiding effect on the sliding of the fixing seat, and the mounting seat is provided with a through hole through which the guide post passes.

8. The gantry bending forming machine for the large straight welded pipe according to claim 1, wherein: the supporting mechanism comprises a supporting table, one end of the supporting table is hinged to the two sides of the lower cross beam, the middle of the supporting table is connected with the lower cross beam through a supporting hydraulic cylinder, and the two ends of the supporting hydraulic cylinder are hinged to the lower cross beam and the supporting table respectively.

9. The gantry bending forming machine for the large straight welded pipe according to claim 1, wherein: the diameter of the straight welded pipe is not less than 406mm, and the outer diameter reaches 1520 mm; the wall thickness of the longitudinal welded pipe reaches 100 mm; the length of the straight welded pipe reaches 12500 mm.

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