Self-adaptive clamping structure for welding forming of rolled steel pipe

Abstract

The invention relates to the field of steel pipe welding, in particular to a self-adaptive clamping structure for welding forming of rolled steel pipes, which comprises a sliding rail, mounting seats distributed in an array are arranged above the sliding rail, first electric rollers rotationally connected are arranged in the upper parts of the mounting seats, and first sliding tables symmetrically distributed are further fixedly arranged on the two sides of the mounting seats; a rolling wheel frame in sliding connection is arranged above the first sliding table, a mounting frame is arranged on the outer side of the mounting base, a control box is fixedly mounted above the mounting frame through bolts, and a conveying and clamping mechanism is arranged above the sliding rail. According to the multi-angle clamping device for the rolled steel pipes, welding gaps of the rolled steel pipes are controlled, and multi-angle clamping is conducted on the rolled steel pipes with different diameters.

Description

Technical Field

[0001] The present invention relates to the field of steel pipe welding, and particularly to an adaptive clamping structure for the welding and forming of rolled steel pipes. Background Art

[0002] In the oil and gas industry, with the continuous expansion of the scale of energy development, a large number of pipelines are required to transport oil and gas resources. Early seamless steel pipes have problems such as high cost and great difficulty in processing large-diameter and thick-wall pipelines. Rolled steel pipes can be processed into large-diameter and various wall-thickness pipelines by curling and welding steel plates, meeting the large demand for pipelines in oil and gas transportation.

[0003] In the prior art, the production process of rolled steel pipes requires welding operations, and the lateral clamping stability of the steel pipes during the welding process is very important, which can fully avoid the situation of weld cracking caused by uneven stress of the steel pipes during welding.

[0004] A Chinese patent discloses a steel pipe processing clamping device (application number: 2024106572436), which is used for clamping and processing welding materials of different specifications, and then welding welding materials of different specifications. The operation is simple and there is no need to replace the fixture, improving the processing efficiency of the welding materials.

[0005] However, the above patent can only perform clamping operations on welding materials of different specifications, and it is difficult to rotate the direction of the welding materials to make the weld upward or at a position where it is easy to weld. At the same time, it is also difficult to extrude the clamped steel pipes to control the weld width and further ensure the overall welding quality.

[0006] In view of the above technical defects, a solution is proposed now. Summary of the Invention

[0007] The purpose of the present invention is to provide an adaptive clamping structure for the welding and forming of rolled steel pipes to solve the above-mentioned technical defects.

[0008] The purpose of the present invention can be achieved by the following technical solutions: An adaptive clamping structure for the welding and forming of rolled steel pipes includes a slide rail. Above the slide rail, there are mounting seats distributed in an array. Inside the upper part of each mounting seat, there is a first electric roller rotatably connected. On both sides of each mounting seat, there are symmetrically distributed first sliding platforms fixed. Above the first sliding platforms, there is a roller rack slidably connected. Outside the mounting seat, there is a mounting frame.

[0009] Above the mounting bracket, a control box is fixedly installed by bolts. Above the slide rail, a conveying and clamping mechanism is provided. The conveying and clamping mechanism includes a second slide table, which is fixedly connected to the mounting seat by bolts. Above the second slide table, six annular plates are arranged in an array. Symmetrically distributed walking and clamping mechanisms are provided on the outer sides of the annular plates. The walking and clamping mechanism includes a housing.

[0010] Preferably, the mounting seat is fixedly connected to the slide rail by bolts. Inside the first slide table, a first hydraulic cylinder is fixedly installed by bolts. The driving shaft of the first hydraulic cylinder extends into the roller frame and is fixedly connected to the roller frame. Symmetrically distributed limiting plates are fixedly provided below the roller frame. Inside the roller frame, a first stepping motor is fixedly installed by bolts. A bearing seat is also fixedly installed inside the roller frame by bolts. The driving shaft of the first stepping motor is connected with a first synchronous wheel assembly and a second synchronous wheel assembly. Symmetrically distributed steering rollers are also rotatably provided inside the roller frame.

[0011] Preferably, a processor, a width measuring module, a deviation rectifying vision module and a signal execution module are arranged inside the control box.

[0012] Preferably, chutes are respectively opened inside the annular plates. External gear rings are fixedly installed on the outer sides of the annular plates by bolts. Inside the second slide table, first roller frames are also arranged in an array. The bottoms of the first roller frames are fixedly connected to the second slide table. Second electric rollers are rotatably arranged inside the first roller frames.

[0013] Preferably, symmetrically distributed arc-shaped grooves are opened inside the housing, and the housing is slidably connected to the outer side of the annular plate through the arc-shaped grooves. An installation groove is opened on one side of the arc-shaped groove, and the external gear ring is located inside the installation groove. A hydraulic cylinder frame is fixedly provided above the housing by bolts. A second hydraulic cylinder is fixedly installed above the hydraulic cylinder frame by bolts. The end of the driving shaft of the second hydraulic cylinder is fixedly provided with a second roller frame. A clamping roller is rotatably arranged inside the second roller frame.

[0014] Preferably, a third stepping motor is also fixedly installed at one end of the second roller frame by bolts. The driving shaft of the third stepping motor is fixedly connected to the shaft at one end of the clamping roller. A limiting rod is fixedly provided on one side of the second roller frame close to the housing. One end of the limiting rod passes through the housing and is slidably connected to the housing.

[0015] Preferably, a rotatably connected double - gear with a shaft is also provided inside each of the shells. The larger gear of the double - gear with a shaft meshes with the external gear ring. A rotatably connected connecting shaft is also provided between the shells. One end of the connecting shaft is fixedly connected with a first spur gear, and the other end of the connecting shaft is fixedly connected with a second spur gear. The first spur gear meshes with the smaller gear inside one of the double - gears with a shaft.

[0016] Preferably, the second spur gear meshes with the larger gear inside the other double - gear with a shaft. A second stepping motor is fixedly provided on the outer side of the shell at the end away from the mounting seat. The drive shaft of the second stepping motor is fixedly connected with the shaft at one end of the double - gear with a shaft.

[0017] Preferably, a gantry is provided between the two walking and clamping mechanisms at the end away from the mounting seat. An elevating welding machine is fixedly provided below the gantry by bolts.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, the deviation angle of the coiled steel pipe is measured by the deviation - correcting sensor installed at the center below the mounting frame. Subsequently, the processor sends the deviation angle to the signal execution module, and then the signal execution module starts two first hydraulic cylinders. The first hydraulic cylinders start to drive the two roller stands to lift, so that the coiled steel pipe is transferred from the first electric roller to between the steering rollers. Subsequently, the first stepping motor is started. The first stepping motor drives the two steering rollers to rotate at the same speed and in the same direction through the first synchronous wheel assembly and the second synchronous wheel assembly to correct the deviation of the coiled steel pipe, so that the joint of the coiled steel pipe is horizontal upward for easy welding.

[0020] 2. In the present invention, the diameter of the coiled steel pipe obtained by the width - measuring module and the maximum gap width at the joint are used to control the stroke of the second hydraulic cylinder in the walking and clamping mechanism, so as to avoid excessive pressure of the second hydraulic cylinder from deforming the pipe wall of the coiled steel pipe. And the maximum gap width at the joint is compared with the maximum welding width of the elevating welding machine. If the maximum gap width is less than the maximum welding width of the elevating welding machine, normal clamping and welding are carried out. If the maximum gap width is greater than the maximum welding width of the elevating welding machine, then the maximum welding width is subtracted from the maximum gap width, and then this value is divided by two to obtain the additional travel value of the second hydraulic cylinder outside the normal clamping stroke, reducing the maximum gap width of the coiled steel pipe. Subsequently, the coiled steel pipe reaches above the second electric roller under the conveying of the first electric roller, and then the clamping rollers in the two walking and clamping mechanisms on the outside of the annular plate clamp the coiled steel pipe to control the welding gap of the coiled steel pipe and perform multi - angle clamping for coiled steel pipes with different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings;

[0022] Figure 1 is the overall structural schematic diagram of the present invention;

[0023] Figure 2 is the connection structural schematic diagram of the mounting base, roller frame and slide rail in the present invention;

[0024] Figure 3 is the internal structural sectional schematic diagram of the roller frame in the present invention;

[0025] Figure 4 is the connection structural schematic diagram when the first hydraulic cylinder lifts the roller frame in the present invention;

[0026] Figure 5 is the schematic diagram of the positional relationship between the conveying and clamping mechanism and the gantry in the present invention;

[0027] Figure 6 is the connection structural schematic diagram of the second slide table and the first roller frame in the present invention;

[0028] Figure 7 is the connection structural schematic diagram of the traveling clamping mechanism and the external gear ring in the present invention;

[0029] Figure 8 is the overall structural schematic diagram of the traveling clamping mechanism in the present invention;

[0030] Figure 9 is the connection structural schematic diagram of the second stepping motor, the shafted double gear and the connecting shaft in the present invention.

[0031] Legend: 1. Slide rail; 11. Mounting base; 12. First electric roller; 13. First slide table; 14. Roller frame; 15. First stepping motor; 16. First synchronous wheel assembly; 17. Second synchronous wheel assembly; 18. Bearing seat; 19. Steering roller; 20. Limiting plate; 21. First hydraulic cylinder; 22. Mounting frame; 3. Conveying and clamping mechanism; 31. Second slide table; 32. Annular plate; 33. Chute; 34. External gear ring; 35. First roller frame; 36. Second electric roller; 4. Traveling clamping mechanism; 41. Housing; 42. Arc-shaped groove; 43. Mounting groove; 44. Hydraulic cylinder frame; 45. Second hydraulic cylinder; 46. Second stepping motor; 47. Shafted double gear; 48. Connecting shaft; 481. First straight gear; 482. Second straight gear; 49. Second roller frame; 50. Third stepping motor; 51. Clamping roller; 52. Limiting rod; 6. Gantry; 61. Lifting welding machine; 7. Control box. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1: Please refer to Figure 1 - Figure 4 As shown in the figure, this embodiment is an adaptive clamping structure for the welding and forming of rolled steel pipes, including a slide rail 1. Above the slide rail 1, there are mounting seats 11 distributed in an array. The mounting seats 11 and the slide rail 1 are fixed by bolts. When it is necessary to move the mounting seat 11, the bolts can be unscrewed to move the mounting seat 11 on the slide rail 1.

[0034] Inside the upper part of each mounting seat 11, there is a first electric roller 12 rotatably connected. The upper part of the first electric roller 12 is used to place the rolled steel pipe to be welded. On both sides of the mounting seat 11, there are symmetrically distributed first sliding platforms 13. The first sliding platforms 13 and the slide rail 1 are fixed by bolts. Inside the first sliding platforms 13, there is also a first hydraulic cylinder 21 fixed by bolts.

[0035] Above the first sliding platform 13, there is a roller rack 14 connected in a sliding manner. The driving shaft of the first hydraulic cylinder 21 extends into the roller rack 14 and is fixedly connected to the roller rack 14. Below the roller rack 14, there are symmetrically distributed limiting plates 20 fixedly provided. The lower ends of the limiting plates 20 extend into the first sliding platform 13 and are slidably connected to the first sliding platform 13. Inside the roller rack 14, there is a first stepping motor 15 fixed by bolts. Inside the roller rack 14, there is also a bearing seat 18 fixed by bolts.

[0036] The driving shaft of the first stepping motor 15 is connected with a first synchronous wheel assembly 16 and a second synchronous wheel assembly 17. Both the first synchronous wheel assembly 16 and the second synchronous wheel assembly 17 are composed of two synchronous wheels and a synchronous belt. One of the synchronous wheels at one end of the second synchronous wheel assembly 17 is fixedly connected to the driving shaft of the first stepping motor 15, and the other synchronous wheel at the other end of the second synchronous wheel assembly 17 is fixedly connected to the shaft inside the bearing seat 18.

[0037] Inside the roller stand 14, there are also symmetrically distributed steering rollers 19. The steering rollers 19 are all rotatably connected to the roller stand 14. One end of the synchronous pulley of the first synchronous pulley assembly 16 is fixedly connected to the shaft at one end of the steering roller 19. The synchronous pulley at the other end of one of the first synchronous pulley assemblies 16 is fixedly connected to the drive shaft of the first stepping motor 15, and the synchronous pulley at the other end of the other first synchronous pulley assembly 16 is fixedly connected to the shaft inside the bearing block 18. When the first stepping motor 15 is started, the two steering rollers 19 are driven to rotate at the same speed and in the same direction through the first synchronous pulley assembly 16 and the second synchronous pulley assembly 17. On the outside of the mounting seat 11, there is a mounting bracket 22, and a control box 7 is fixedly installed above the mounting bracket 22 by bolts.

[0038] Inside the control box 7, there are a processor, a width measurement module, a deviation correction vision module, and a signal execution module.

[0039] The width measurement module collects the diameter of the rolled steel pipe and the maximum gap width at the joint through width measurement sensors installed on both sides of the mounting bracket 22. The deviation correction vision module measures the deviation angle of the rolled steel pipe through a deviation correction sensor installed at the center below the mounting bracket 22. Then, the processor sends the deviation angle to the signal execution module, and the signal execution module starts two first hydraulic cylinders 21;

[0040] When the first hydraulic cylinders 21 are started, they drive the two roller stands 14 to lift. The rolled steel pipe is transferred from the first electric roller 12 to between the steering rollers 19. Then, the first stepping motor 15 is started. The first stepping motor 15 drives the two steering rollers 19 to rotate at the same speed and in the same direction through the first synchronous pulley assembly 16 and the second synchronous pulley assembly 17 to correct the deviation of the rolled steel pipe, so that the joint of the rolled steel pipe is horizontal and upward for welding.

[0041] Embodiment 2: Please refer to Figure 5 - Figure 9 As shown in the figure, this embodiment is an adaptive clamping structure for the welding and forming of rolled steel pipes, including a slide rail 1. Above the slide rail 1, there is a conveying and clamping mechanism 3. The conveying and clamping mechanism 3 includes a second slide table 31. The second slide table 31 is located above the mounting seat 11 and is fixedly connected to the mounting seat 11 by bolts. Above the second slide table 31, there are six annular plates 32 distributed in an array. Inside the annular plates 32, there are chutes 33. On the outside of the annular plates 32, external gear rings 34 are fixedly installed by bolts. Inside the second slide table 31, there are also first roller frames 35 distributed in an array. The bottoms of the first roller frames 35 are fixedly connected to the second slide table 31. Inside the first roller frames 35, there are second electric rollers 36 rotatably connected.

[0042] On the outer sides of the annular plate 32, symmetrically distributed walking and clamping mechanisms 4 are provided. The walking and clamping mechanism 4 includes a housing 41. Inside the housing 41, symmetrically distributed arc-shaped grooves 42 are formed. The arc-shaped grooves 42 are located on the outer side of the annular plate 32. An installation groove 43 is formed on one side of the arc-shaped groove 42. The external gear ring 34 is located inside the installation groove 43.

[0043] At the upper end of the housing 41, a hydraulic cylinder frame 44 is fixedly provided through bolts. Above the hydraulic cylinder frame 44, a second hydraulic cylinder 45 is fixedly provided through bolts. The drive shaft of the second hydraulic cylinder 45 passes through the housing 41 and the chute 33 and then a second roller frame 49 is fixedly provided. Inside the second roller frame 49, a clamping roller 51 is rotatably connected. At one end of the second roller frame 49, a third stepping motor 50 is also fixedly provided through bolts. The drive shaft of the third stepping motor 50 is fixedly connected to one end of the clamping roller 51. On the side of the second roller frame 49 close to the housing 41, a fixedly connected limiting rod 52 is also provided. One end of the limiting rod 52 passes through the housing 41 and is slidably connected to the housing 41.

[0044] Inside the housing 41, a belt shaft double gear 47 is also rotatably connected. The larger gear in the belt shaft double gear 47 meshes with the external gear ring 34. Between the housings 41, a connecting shaft 48 is also rotatably connected. At one end of the connecting shaft 48, a first straight gear 481 is fixedly provided. At the other end of the connecting shaft 48, a second straight gear 482 is fixedly provided.

[0045] The first straight gear 481 has the same size as the smaller gear in the belt shaft double gear 47. The second straight gear 482 has the same size as the larger gear in the belt shaft double gear 47. The first straight gear 481 meshes with the smaller gear in one of the belt shaft double gears 47. The second straight gear 482 meshes with the larger gear in the other belt shaft double gear 47. On the outer side of the housing 41 at the end far from the mounting seat 11, a second stepping motor 46 is fixedly installed through bolts. The drive shaft of the second stepping motor 46 is fixedly connected to the shaft at one end of the belt shaft double gear 47.

[0046] A gantry 6 is provided between the two walking and clamping mechanisms 4 at the end far from the mounting seat 11. Below the gantry 6, a lifting welding machine 61 is fixedly provided through bolts.

[0047] The belt shaft double gears 47 in two adjacent housings 41 are connected through the connecting shaft 48, the first straight gear 481 and the second straight gear 482, so that the installation angles of the two adjacent housings 41 are different. Furthermore, the clamping of the rolled steel pipe by each walking and clamping mechanism 4 is not at the same point, reducing the possibility of the pipe wall deforming caused by clamping at the same point.

[0048] When it is necessary to adjust the clamping angle of the walking clamping mechanism 4, the second stepping motor 46 is started, and the second stepping motor 46 drives the belt shaft double gear 47 to rotate. The belt shaft double gear 47 meshes with the external gear ring 34, so as to perform a circular motion on the outside of the external gear ring 34. While the belt shaft double gear 47 moves, it drives another belt shaft double gear 47 to move through the first spur gear 481, the connecting shaft 48 and the second spur gear 482, so as to realize the synchronous movement of multiple walking clamping mechanisms 4.

[0049] And when clamping the rolled steel pipe, the stroke of the second hydraulic cylinder 45 in the walking clamping mechanism 4 is controlled according to the diameter of the rolled steel pipe obtained by the width measuring module and the maximum gap width at the joint, so as to prevent the pressure of the second hydraulic cylinder 45 from being too large and squeezing and deforming the pipe wall of the rolled steel pipe. And the maximum gap width is compared with the maximum welding width of the lifting welding machine 61. If the maximum gap width is less than the maximum welding width of the lifting welding machine 61, normal clamping and welding are carried out. If the maximum gap width is greater than the maximum welding width of the lifting welding machine 61, the maximum welding width is subtracted from the maximum gap width, and then this value is divided by two to obtain the additional travel value of the second hydraulic cylinder 45 outside the normal clamping stroke, so as to reduce the maximum gap width of the rolled steel pipe. Subsequently, the lifting welding machine 61 is started to weld the rolled steel pipe.

[0050] The working process and principle of the present invention are as follows:

[0051] The rolled steel pipe is placed above the first electric roller 12 in the mounting seat 11, and the first electric roller 12 is started to drive the rolled steel pipe to move towards the end close to the lifting welding machine 61. When the rolled steel pipe moves into the inside of the mounting frame 22, the deviation correction vision module in the control box 7 measures the deviation angle of the rolled steel pipe through the deviation correction sensor installed at the center under the mounting frame 22, and then sends the deviation angle to the signal execution module through the processor;

[0052] When both ends of the rolled steel pipe are located outside the two first sliding tables 13, the signal execution module starts the two first hydraulic cylinders 21. The first hydraulic cylinders 21 start to drive the two roller frames 14 to lift, so that the rolled steel pipe is transferred from the first electric roller 12 to between the turning rollers 19. Subsequently, the first stepping motor 15 is started, and the first stepping motor 15 drives the two turning rollers 19 to rotate at the same speed and in the same direction through the first synchronous wheel assembly 16 and the second synchronous wheel assembly 17 to correct the deviation of the rolled steel pipe, so that the joint of the rolled steel pipe is horizontally upward for welding;

[0053] After the angle correction of the rolled steel pipe is completed, the first hydraulic cylinder 21 drives the roller frame 14 to descend, so as to place the corrected rolled steel pipe above the first electric roller 12. The first electric roller 12 is started to convey the rolled steel pipe into the annular plate 32. At this time, the diameter of the rolled steel pipe obtained by the width measurement module and the maximum gap width at the joint are used to control the stroke of the second hydraulic cylinder 45 in the walking clamping mechanism 4, so as to prevent the pressure of the second hydraulic cylinder 45 from being too large to squeeze and deform the pipe wall of the rolled steel pipe, and the maximum gap width at the joint is compared with the maximum welding width of the lifting welding machine 61. If the maximum gap width is less than the maximum welding width of the lifting welding machine 61, the clamping and welding are carried out normally;

[0054] If the maximum gap width is greater than the maximum welding width of the lifting welding machine 61, then subtract the maximum welding width from the maximum gap width, and then divide this value by two to obtain the additional travel value of the second hydraulic cylinder 45 outside the normal clamping stroke, so as to reduce the maximum gap width of the rolled steel pipe. Subsequently, the rolled steel pipe reaches above the second electric roller 36 under the conveyance of the first electric roller 12, and then the clamping rollers 51 in the two walking clamping mechanisms 4 outside the annular plate 32 clamp the rolled steel pipe. The rolled steel pipe is clamped and conveyed by starting the third stepping motor 50 and the second electric roller 36, and then the rolled steel pipe is welded by starting the lifting welding machine 61.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor limit the present invention to the specific implementation manners only. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An adaptive clamping structure for the welding and forming of coiled steel pipes, including a slide rail (1), characterized in that, Above the sliding rail (1), there are mounting seats (11) distributed in an array. Inside the upper part of each mounting seat (11), there is a first electric roller (12) rotatably connected. On both sides of the mounting seat (11), there are also symmetrically distributed first sliding platforms (13). Above the first sliding platform (13), there is a roller frame (14) slidably connected. Outside the mounting seat (11), there is a mounting frame (22). Above the mounting frame (22), a control box (7) is fixedly installed by bolts. Above the sliding rail (1), there is a conveying and clamping mechanism (3). The conveying and clamping mechanism (3) includes a second sliding platform (31). The second sliding platform (31) is fixedly connected to the mounting seat (11) by bolts. Above the second sliding platform (31), there are six annular plates (32) distributed in an array. On the outer side of each annular plate (32), there are symmetrically distributed walking and clamping mechanisms (4). The walking and clamping mechanism (4) includes a housing (41).

2. The adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 1, characterized in that, The mounting seat (11) is fixedly connected to the sliding rail (1) by bolts. Inside the first sliding platform (13), a first hydraulic cylinder (21) is fixedly installed by bolts. The driving shaft of the first hydraulic cylinder (21) extends into the roller frame (14) and is fixedly connected to the roller frame (14). Below the roller frame (14), there are symmetrically distributed limiting plates (20). Inside the roller frame (14), a first stepping motor (15) is fixedly installed by bolts. Inside the roller frame (14), there is also a bearing seat (18) fixedly installed by bolts. The driving shaft of the first stepping motor (15) is connected with a first synchronous wheel assembly (16) and a second synchronous wheel assembly (17). Inside the roller frame (14), there are also symmetrically distributed steering rollers (19) rotatably arranged.

3. The self - adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 1, wherein, Inside the control box (7), there are a processor, a width measuring module, a deviation correction vision module and a signal execution module arranged.

4. An adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 1, characterized in that, Inside each annular plate (32), there is a chute (33) opened. On the outer side of each annular plate (32), an external gear ring (34) is fixedly installed by bolts. Inside the second sliding platform (31), there are also first roller frames (35) distributed in an array. The bottom of each first roller frame (35) is fixedly connected to the second sliding platform (31). Inside each first roller frame (35), there is a second electric roller (36) rotatably connected.

5. An adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 4, characterized in that, Inside the housing (41), there are symmetrically distributed arc-shaped grooves (42). And the housing (41) is slidably connected to the outer side of the annular plate (32) through the arc-shaped grooves (42). On one side of the arc-shaped groove (42), there is a mounting groove (43) opened. The external gear ring (34) is located inside the mounting groove (43). Above the housing (41), a hydraulic cylinder frame (44) is fixedly installed by bolts. Above the hydraulic cylinder frame (44), a second hydraulic cylinder (45) is fixedly installed by bolts. The end of the driving shaft of the second hydraulic cylinder (45) is fixedly provided with a second roller frame (49). Inside the second roller frame (49), there is a clamping roller (51) rotatably connected.

6. The adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 5, wherein One end of the second roller frame (49) is also fixedly provided with a third stepping motor (50) through bolts. The drive shaft of the third stepping motor (50) is fixedly connected to the shaft at one end of the clamping roller (51). One side of the second roller frame (49) close to the housing (41) is also provided with a fixedly connected limiting rod (52). One end of the limiting rod (52) passes through the housing (41) and is slidably connected to the housing (41).

7. An adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 1, characterized in that, Inside the housing (41), there are also rotatably connected belt shaft double gears (47). The larger gear in the belt shaft double gears (47) meshes with the external gear ring (34). Between the housings (41), there are also rotatably connected connecting shafts (48). One end of the connecting shaft (48) is fixedly provided with a first spur gear (481), and the other end of the connecting shaft (48) is fixedly provided with a second spur gear (482). The first spur gear (481) meshes with the smaller gear inside one of the belt shaft double gears (47).

8. An adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 7, characterized in that, The second spur gear (482) meshes with the larger gear inside the other belt shaft double gear (47). On the outer side of the housing (41) at the end far from the mounting seat (11), a second stepping motor (46) is fixedly provided. The drive shaft of the second stepping motor (46) is fixedly connected to the shaft at one end of the belt shaft double gear (47).

9. The self - adaptive clamping structure for the welding and forming of coiled steel pipes according to claim 1, wherein, A gantry (6) is provided between the two walking clamping mechanisms (4) at the end far from the mounting seat (11). An elevating welding machine (61) is fixedly provided below the gantry (6) through bolts.

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