A welding device suitable for steel pipes and flanges with different diameters

Abstract

The present invention relates to the field of welding technology, and in particular to an alignment welding device suitable for steel pipes and flanges of different diameters, comprising a base, a mounting frame fixedly mounted on the upper surface of the base, a welding gun assembly fixedly mounted on the upper end of the mounting frame, a slider fixedly mounted inside the base via a moving mechanism, the slider being slidably arranged on the upper surface of the base, a first clamping mechanism fixedly mounted on the upper end of the slider via a supporting mechanism, a driving shaft rotatably mounted inside the mounting frame, a second clamping mechanism fixedly mounted on the end of the driving shaft, the device can position steel pipes and flanges of different diameters, facilitates welding, and is worthy of promotion.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to an alignment welding device suitable for steel pipes and flanges with different diameters. Background Art

[0002] In the work of welding steel pipes and flanges, steel pipes and flanges of different sizes will be required in different situations, which requires welding equipment to be able to meet the function of clamping steel pipes and flanges of different sizes. In addition, the accuracy of circumferential overlap needs to be ensured during the fixing process of steel pipes and flanges. In the Chinese invention document with application number CN202111173412.1, a welding machine that can solve the problems of inconvenience in docking stainless steel pipes and flanges and low axial overlap accuracy is disclosed. In this document, a supporting and clamping mechanism is set up to assist in supporting stainless steel pipe fittings, and an external clamping positioning mechanism can be used to quickly clamp and clamp flanges of different sizes. The height of the gantry can be adjusted by a handwheel adjustment rod so that the axis between the stainless steel pipe and the flange coincides, thereby improving the accuracy of axial overlap between the stainless steel pipe and the flange, and can also clamp and fix flanges of different sizes. However, when the height of the gantry is adjusted by the handwheel adjustment rod, the accuracy of the axial overlap between the stainless steel pipe and the flange still requires manual judgment, which may result in errors and is time-consuming and labor-intensive, thus having disadvantages. Summary of the invention

[0003] The purpose of the present invention is to solve the disadvantage of poor butt joint effect of steel pipes and flanges with different diameters in the prior art, and to propose an alignment welding device suitable for steel pipes and flanges with different diameters.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A device for aligning and welding steel pipes and flanges of different diameters is designed, comprising a base, a mounting frame is fixedly mounted on the upper surface of the base, a welding gun assembly is fixedly mounted on the upper end of the mounting frame, a slider is fixedly mounted inside the base via a moving mechanism, the slider is slidably arranged on the upper surface of the base, a first clamping mechanism is fixedly mounted on the upper end of the slider via a supporting mechanism, a driving shaft is rotatably mounted inside the mounting frame, and a second clamping mechanism is fixedly mounted on the end of the driving shaft.

[0006] Preferably, the supporting mechanism includes a supporting arc frame, a guide ring and a clamping shell, the guide ring is fixedly installed on the outer surface of the clamping shell, the lower end of the supporting arc frame is fixedly connected to the slider, and the upper end is sleeved on the outside of the guide ring, the guide ring can be rotatably arranged inside the supporting arc frame, the first hole grooves are opened on both side surfaces of the clamping shell, and the first clamping mechanism is fixedly installed inside the clamping shell.

[0007] Preferably, the first clamping mechanism includes a linkage gear, a sliding rod, a positioning ring, a connecting rod, a clamping plate, a driving gear and an adjusting rod, the linkage gear is rotatably arranged inside the mounting shell, the linkage gear is meshed and connected with the driving gear, the driving gear is rotatably arranged in the clamping shell, the end of the adjusting rod extends through the clamping shell and is fixedly connected to the driving gear, a second hole groove and a strip groove are provided inside the linkage gear, at least three strip grooves are provided and are distributed in a circular array along the second hole groove, an arc groove is provided on one side surface of the clamping shell, one end of the sliding rod is penetrated and arranged in the strip groove, and the other end is slidably arranged in the second hole groove, the connecting rod is slidably arranged on the inner wall surface of the clamping shell through the positioning ring, one end of the connecting rod is movably sleeved on the outside of the sliding rod, and the other end is fixedly connected to the clamping plate.

[0008] Preferably, the linkage gear and the clamping shell are coaxially arranged, and the guide ring and the clamping shell are coaxially arranged.

[0009] Preferably, the second clamping mechanism includes a mounting shell, a screw and a threaded sleeve block, the mounting shell is fixedly connected to the driving shaft, the screw is a bidirectional screw and is rotatably arranged in the mounting shell, a pair of threaded sleeve blocks are respectively threadedly sleeved on both ends of the screw, and a clamping member is fixedly installed on one side of the threaded sleeve block.

[0010] Preferably, the central axis of the clamping shell passes through the midpoint of the line connecting the two threaded sleeves.

[0011] Preferably, the clamping member includes a clamping frame, a first spring and a push rod, the threaded sleeve is fixedly connected to the clamping frame, one end of the push rod movably extends through the inside of the clamping frame, one end of the first spring is fixedly connected to the inside of the push rod, and the other end is fixedly connected to the clamping frame.

[0012] Preferably, anti-slip pads are fixedly mounted on the inner surfaces of the two clamping frames.

[0013] Preferably, fasteners that cooperate with each other are fixedly installed between the clamping shell and the mounting shell.

[0014] Preferably, the fastener includes a positioning block, a fixing box, a second spring and a docking rod, the fixing box is fixedly installed on the side of the clamping shell close to the mounting shell, one end of the docking rod is slidably arranged inside the fixing box, one end of the second spring is fixedly connected to the fixing box, and the other end is fixedly connected to the docking rod, the positioning block is fixedly installed on one side of the mounting shell, and the positioning block can be matched and connected with the other end of the docking rod.

[0015] The present invention proposes an alignment welding device for steel pipes and flanges of different diameters, which has the beneficial effect that when the device is in use, the rotating screw can drive the two threaded sleeves to approach or move away from each other at the same time, which can not only clamp and fix flanges of different sizes, but also ensure that the central axis of the flange always passes through the midpoint of the line connecting the two threaded sleeves. Steel pipes of different sizes can be clamped by the clamping plates, and the distances from all clamping plates to the central axis of the clamping shell are always equal, so it can be ensured that the central axis of the steel pipe always coincides with the central axis of the clamping plate. Therefore, when steel pipes and flanges of different sizes are clamped, their axial axes can be guaranteed to coincide, thus avoiding the disadvantages of human judgment and achieving a good docking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a circular flange and a square flange in the prior art;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of a device for aligning and welding steel pipes and flanges of different diameters proposed by the present invention;

[0018] Figure 3 A schematic cross-sectional view of a device for aligning and welding steel pipes and flanges of different diameters proposed by the present invention;

[0019] Figure 4 This is a structural schematic diagram of a first clamping mechanism in a device for aligning and welding steel pipes and flanges of different diameters proposed by the present invention;

[0020] Figure 5 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0021] In the figure: base 1, mounting frame 2, slider 3, supporting arc frame 4, guide ring 5, clamping shell 6, first hole groove 7, linkage gear 8, second hole groove 9, strip groove 10, sliding rod 11, positioning ring 12, connecting rod 13, clamping plate 14, driving gear 15, adjusting rod 16, arc groove 17, driving shaft 18, mounting shell 19, screw rod 20, threaded sleeve block 21, clamping frame 22, first spring 23, push rod 24, positioning block 25, fixing box 26, second spring 27, docking rod 28, welding gun assembly 29, moving mechanism 30. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Example 1

[0024] Reference Figure 2-5 A device for aligning and welding steel pipes and flanges of different diameters comprises a base 1, a mounting frame 2 is fixedly mounted on the upper surface of the base 1, a welding gun assembly 29 is fixedly mounted on the upper end of the mounting frame 2, a slider 3 is fixedly mounted inside the base 1 through a moving mechanism 30, the moving mechanism 30 can drive the slider 3 to move, the slider 3 is slidably arranged on the upper surface of the base 1, and a first clamping mechanism is fixedly mounted on the upper end of the slider 3 through a supporting mechanism, when the slider 3 moves, the supporting mechanism can be driven to move, and the movement of the supporting mechanism can drive the first clamping mechanism to move, a driving shaft 18 is rotatably mounted inside the mounting frame 2, the driving shaft 18 is connected to an external power device, a second clamping mechanism is fixedly mounted on the end of the driving shaft 18, the second clamping mechanism is used to clamp and fix the flange, and the rotation of the driving shaft 18 can drive the second clamping mechanism to rotate.

[0025] The supporting mechanism includes a supporting arc frame 4, a guide ring 5 and a clamping shell 6. The guide ring 5 is fixedly installed on the outer surface of the clamping shell 6. The lower end of the supporting arc frame 4 is fixedly connected to the slider 3, and the upper end is sleeved on the outer side of the guide ring 5. The guide ring 5 is rotatably arranged inside the supporting arc frame 4. The guide ring 5 and the supporting arc frame 4 cooperate with each other so that the clamping shell 6 can rotate, and the guide ring 5 and the clamping shell 6 are coaxially arranged, so the clamping shell 6 will only rotate along its own central axis. First hole grooves 7 are opened on both sides of the clamping shell 6. The first hole groove 7 is used to place the steel pipe. The first clamping mechanism is fixedly installed inside the clamping shell 6, and the first clamping mechanism is used to clamp the steel pipe.

[0026] The first clamping mechanism includes a linkage gear 8, a sliding rod 11, a positioning ring 12, a connecting rod 13, a clamping plate 14, a driving gear 15 and an adjusting rod 16. The linkage gear 8 is rotatably arranged inside the mounting shell 19. The linkage gear 8 is meshed and connected with the driving gear 15. The driving gear 15 is rotatably arranged in the clamping shell 6. The adjusting rod 16 extends through the end portion of the clamping shell 6 and is fixedly connected to the driving gear 15. Rotating the adjusting rod 16 can drive the driving gear 15 to rotate. Rotating the driving gear 15 can drive the linkage gear 8 to rotate. The linkage gear 8 and the clamping shell 6 are coaxially arranged. The linkage gear 8 will only rotate along the central axis of the clamping shell 6.

[0027] A second hole groove 9 and a strip groove 10 are provided inside the linkage gear 8. At least three strip grooves 10 are provided and are distributed in a circumferential array along the second hole groove 9. The central axes of the second hole groove 9 and the first hole groove 7 coincide with the central axis of the clamping shell 6. An arc groove 17 is provided on one side surface of the clamping shell 6. One end of the sliding rod 11 is penetrated and set in the strip groove 10, and the other end is slidably set in the second hole groove 9. The connecting rod 13 is slidably set on the inner wall surface of the clamping shell 6 through the positioning ring 12. The connecting rod 13 can be restricted by the positioning ring 12. It moves along the length direction of the strip groove 10, one end of the connecting rod 13 is movably mounted on the outside of the sliding rod 11, and the other end is fixedly connected to the clamping plate 14. The positioning ring 12 and the sliding rod 11 support the connecting rod 13, and the length extension line of the connecting rod 13 will always pass through the central axis of the clamping shell 6. The clamping plate 14 is used to clamp the steel pipe. When the sliding rod 11 drives the connecting rod 13 to move, the moving distance of the connecting rod 11 will be completely equal, so it can be ensured that the central axis of the steel pipe will coincide with the central axis of the clamping shell 6.

[0028] The second clamping mechanism includes a mounting shell 19, a screw rod 20 and a threaded sleeve block 21. The mounting shell 19 is fixedly connected to the driving shaft 18. The rotation of the driving shaft 18 can drive the mounting shell 19 to rotate, and the rotation of the mounting shell 19 can drive the flange to rotate. The screw rod 20 is a bidirectional screw rod and is rotatably arranged in the mounting shell 19. A pair of threaded sleeve blocks 21 are respectively threadedly sleeved on both ends of the screw rod 20. When the screw rod 20 rotates, it will drive the threaded sleeve blocks 21 to approach or move away from each other at the same time, and after the flange is clamped and fixed, its central axis will always pass through the midpoint of the line between the two threaded sleeve blocks 21. A clamping piece is fixedly installed on one side of the threaded sleeve block 21, and the clamping piece is used to clamp the flange. The central axis of the clamping shell 6 passes through the midpoint between the two threaded sleeve blocks 21, so it can ensure that the central axes of the steel pipe and the flange coincide with each other.

[0029] During the use of the device, the flange needs to be fixed by the clamping piece, and then the screw rod 20 is rotated to drive the threaded sleeve block 21 to rotate, the threaded sleeve block 21 moves to clamp and fix the flange, and then the steel pipe is placed in the first hole groove 7, and then the adjusting rod 16 is rotated. The rotation of the adjusting rod 16 will drive the driving gear 15 to rotate, and the rotation of the driving gear 15 will drive the linkage gear 8 to rotate. The rotation of the linkage gear 8 will drive the bar groove 10 to rotate. The rotation of the bar groove 10 will have a force to drive the sliding rod 11 to rotate, but the end of the sliding rod 11 away from the bar groove 10 is located in the arc groove 17. Since the arc groove 17 is fixed, the sliding rod 11 will be restricted by the inner wall of the arc groove 17 while being subjected to the force of the inner wall of the bar groove 10, which will cause the sliding While the shift rod 11 rotates along the strip groove 10, it will also slide in the arc groove 17, so the position of the sliding rod 11 in the strip groove 10 will also change. When the sliding rod 11 moves, it will drive the connecting rod 13 and the clamping plate 14 to move, so that the distance between the clamping plate 14 and the center point of the clamping shell 6 can be adjusted, so that steel pipes of different diameters can be clamped, and it can be ensured that the central axis of the steel pipe always coincides with the central axis of the clamping shell 6. Here, it is explained that since the linkage gear 8 and the clamping shell 6 both have thick walls, the sliding rod 11 will not tilt when it is simultaneously subjected to the forces of the strip groove 10 and the arc groove 17, and the length direction of the sliding rod 11 is always perpendicular to the inner wall surface of the linkage gear 8 and the clamping shell 6. When the slider 3 is moved by the moving mechanism 30, the movement of the slider 3 can drive the support arc frame 4 to move, the movement of the support arc frame 4 can drive the clamping shell 6 to move through the guide ring 4, and the movement of the clamping shell 6 can drive the steel pipe to move, so that the steel pipe and the flange can be in conflict with each other, so that welding can be carried out. During the welding process, the steel pipe and the flange are first pre-welded by the welding gun assembly 29 to fix the steel pipe and the flange, and then the external power equipment is started to drive the driving shaft 18 to rotate, and the rotation of the driving shaft 18 drives the installation shell 19 to rotate, and the rotation of the installation shell 19 will drive the flange to rotate, so that the steel pipe and the flange can be rotated at the same time, which is convenient for welding.

[0030] Example 2

[0031] In the above embodiment, the flange is clamped and fixed by a clamping member. However, since the flanges welded to the steel pipe in the prior art have different shapes, different flanges are required according to different use environments. The existing flanges basically have two forms: round flanges and square flanges. However, most of the existing welding clamping equipment cannot be applied to these two forms of flanges at the same time. Therefore, this embodiment is proposed, referring to Figure 3 and Figure 5As another preferred embodiment of the present invention, on the basis of embodiment 1, the clamping member includes a clamping frame 22, a first spring 23 and a push rod 24, the threaded sleeve 21 is fixedly connected to the clamping frame 22, one end of the push rod 24 movably extends through the inside of the clamping frame 22, one end of the first spring 23 is fixedly connected to the inside of the push rod 24, and the other end is fixedly connected to the clamping frame 22, the threaded sleeve 21 will drive the clamping frames 22 to move closer to or away from each other when they move closer to or away from each other, so that the flange can be clamped by the clamping frame 22, and the push rod 24 can match the eyelet inside the flange, so as to prevent the flange from slipping or detaching from the clamping frame 22, and the inside of the two clamping frames 22 The side surfaces are fixedly installed with anti-skid pads, which have an anti-skid effect and can increase the friction force between the clamping frame 22 and the flange, improve the stability of the flange clamping, and reduce the wear between the flange and the inner wall of the clamping frame 22. In addition, during the movement of the threaded sleeve 21 to drive the clamping frame 22 to move, the adjustment is mainly carried out by hand-held rotating screw 20. The clamping force of the clamping frame 22 on the flange mainly comes from the force of the hand-held rotating screw 20. During clamping, the flange is fixed mainly by limiting the holes of the flange by the support rod 24. In this way, when clamping the thin-walled flange, reducing the force of the hand-rotating screw 20 can avoid damage to the clamping frame 22 or bending the thin-walled flange during the clamping process.

[0032] Pull the push rod 24 outward, the first spring 23 is stretched, and the two opposite holes of the flange are matched with the push rod 24. Then the push rod 24 is loosened, and the first spring 23 retracts to drive the bottom rod 24 to move to the side of the mounting shell 19. Under the elastic force of the first spring 23, the push rod 24 will restrict and fix the flange. Whether it is a circular flange or a square flange, the push rod 24 restricts and fixes the holes for clamping. Therefore, the device is suitable for both square flanges and circular flanges. After the two opposite holes inside the flange are fixed by the push rod 24, the center axis of the flange will pass through the midpoint of the line connecting the two threaded sleeve blocks 21. Therefore, the clamping member can ensure that the center axes of the circular flange and the square flange will coincide with the center axis of the steel pipe after clamping and fixing.

[0033] Example 3

[0034] In the above embodiment, when the flange and the steel pipe conflict with each other, the welding gun assembly 29 can be used to perform preliminary welding on the flange and the steel pipe, so that the flange and the steel pipe are connected, and then the external power equipment is started to drive the driving shaft 18 to rotate. The rotation of the driving shaft 18 can drive the mounting shell 19 to rotate, and the rotation of the mounting shell 19 can drive the flange to rotate. The rotation of the flange can drive the steel pipe to rotate. However, if the steel pipe is a non-straight steel pipe and the flange is a square flange, then such a steel pipe and flange will have angle requirements when welding. After the flange and the steel pipe conflict with each other, before the preliminary welding is performed by the welding gun assembly 29, during this period, the flange and the steel pipe may move. In this way, when the steel pipe and flange with requirements for the welding angle are welded, the welding quality will be affected. For this reason, this embodiment is proposed, with reference to Figure 3 As another preferred embodiment of the present invention, on the basis of embodiment 1 or embodiment 2, mutually cooperating fasteners are fixedly installed between the clamping shell 6 and the mounting shell 19, and the fasteners include a positioning block 25, a fixing box 26, a second spring 27 and a docking rod 28. The fixing box 26 is fixedly installed on the side of the clamping shell 6 close to the mounting shell 19, and one end of the docking rod 28 is slidably arranged inside the fixing box 26. One end of the second spring 27 is fixedly connected to the fixing box 26 and the other end is fixedly connected to the docking rod 28. The positioning block 25 is fixedly installed on one side of the mounting shell 19, and the positioning block 25 can be connected with the other end of the docking rod 28. When the positioning block 25 and the docking rod 28 cooperate with each other, relative rotation will not occur between the mounting shell 19 and the clamping shell 6, so that relative rotation will not occur between the steel pipe and the flange.

[0035] After the flange and the steel pipe are clamped and fixed respectively, the slider 3 is driven to move by the moving mechanism 30, and then the positioning block 25 and the docking rod 28 are matched with each other by rotating the clamping shell 6, and then the angle of the steel pipe can be adjusted as needed, so that it can be ensured that the angle between the steel pipe and the flange can meet the needs, and there will be no relative rotation between the steel pipe and the flange, thereby improving the welding quality.

[0036] Working principle:

[0037] S1: When clamping the flange, first pull a push rod 24 so that the push rod 24 matches with any hole inside the flange. Under the elastic support of the first spring 23, the end of the push rod 24 can limit the flange so that the flange is restricted on the clamping frame 22. Then rotate the screw rod 20. The rotation of the screw rod 20 drives the two threaded sleeves 21 to approach each other at the same time. Finally, adjust another push rod 24 so that the push rod 24 matches with the hole inside the flange that is opposite to the hole in S1. The flange is fixed. By adjusting and changing the distance between the threaded sleeves 21, flanges of different diameters can be clamped and fixed, and the central axis of the fixed flange always passes through the midpoint of the line between the two threaded sleeves 21. In addition, whether it is a circular flange or a square flange, it is clamped by limiting and fixing the hole through the push rod 24. Therefore, the device is suitable for both square flanges and circular flanges.

[0038] S2: When clamping the steel pipe, put the steel pipe into the first hole groove 7 and the second hole groove 9, rotate the adjusting rod 16, the adjusting rod 16 drives the driving gear 15 to rotate, the driving gear 15 rotates to drive the linkage gear 8 to rotate, the linkage gear 8 rotates to drive the bar groove 10 to rotate, the bar groove 10 rotates to drive the sliding rod 11 to rotate. Since the arc groove 17 is fixed, the sliding rod 11 is subject to the force of the inner wall of the bar groove 10 and is also restricted by the inner wall of the arc groove 17, which will cause the sliding rod 11 to move along the bar groove 17. 0 will also slide in the arc groove 17 while rotating, so the position of the sliding rod 11 in the strip groove 10 will also change. When the sliding rod 11 moves, it will drive the connecting rod 13 and the clamping plate 14 to move, so that steel pipes of different diameters can be clamped, and the central axis of the steel pipe can always be coincident with the central axis of the clamping shell 6. Because the central axis of the clamping shell 6 passes through the midpoint of the line between the two threaded sleeves 21, the central axes of the steel pipe and the flange coincide, ensuring that the steel pipe and the flange are coaxially arranged and the matching is more accurate.

[0039] S3: When the steel pipe and the flange are matched, first start the moving mechanism 30 to drive the slider 3 to move. The movement of the slider 3 will drive the support arc frame 4 to move. The movement of the support arc frame 4 can drive the clamping shell 6 to move through the guide ring 4. The movement of the clamping shell 6 can drive the steel pipe to move. When the clamping shell 6 moves close to the installation shell 19, rotate the clamping shell 6 so that the docking rod 28 and the positioning block 25 cooperate with each other. If the steel pipe is a straight pipe, there is no need to adjust the angle of the steel pipe again. If the steel pipe is a curved pipe and the flange is a square flange, in this case, there are generally requirements for the angle between the steel pipe and the flange. At this time, it is necessary to loosen the clamping plate 14 and the steel pipe by rotating the adjusting rod 16, and adjust the angle of the steel pipe again. After the adjustment, continue to drive the slider 3 to move through the moving mechanism 30, and the movement of the slider 3 drives the steel pipe to contact and fit with the flange;

[0040] S4: During welding, while the welding gun assembly 29 is welding, the external power equipment is started to drive the active shaft 18 to rotate. The rotation of the active shaft 18 will drive the mounting shell 19 to rotate. The rotation of the mounting shell 19 will drive the flange to rotate through the clamping frame 22. The rotation of the mounting shell 19 will also drive the positioning block 25 to rotate. The rotation of the positioning block 25 will drive the docking rod 28 to rotate. The rotation of the docking rod 28 will rotate through the fixing box 26. The rotation of the fixing box 26 will drive the clamping shell 6 to rotate. The rotation of the clamping shell 6 will drive the steel pipe to rotate, so that the steel pipe and the flange can keep rotating synchronously, which can improve the accuracy of the welding of the steel pipe and the flange.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for using a welding device for aligning steel pipes and flanges of different diameters, characterized in that: The following steps are involved: S1, provides a device for aligning and welding steel pipes and flanges of different diameters, the device comprising a base (1), a mounting frame (2) fixedly mounted on the upper surface of the base (1), a welding gun assembly (29) fixedly mounted on the upper end of the mounting frame (2), a slider (3) fixedly mounted inside the base (1) via a moving mechanism (30), the slider (3) slidably arranged on the upper surface of the base (1), a first clamping mechanism fixedly mounted on the upper end of the slider via a supporting mechanism, a driving shaft (18) rotatably mounted inside the mounting frame (2), a second clamping mechanism fixedly mounted on the end of the driving shaft (18); The support mechanism comprises a support arc frame (4), a guide ring (5) and a clamping shell (6); the guide ring (5) is fixedly mounted on the outer surface of the clamping shell (6); the lower end of the support arc frame (4) is fixedly connected to the slider (3), and the upper end is sleeved on the outer side of the guide ring (5); the guide ring (5) is rotatably arranged inside the support arc frame (4); first holes (7) are provided on both side surfaces of the clamping shell (6); and the first clamping mechanism is fixedly mounted inside the clamping shell (6); The first clamping mechanism comprises a linkage gear (8), a sliding rod (11), a positioning ring (12), a connecting rod (13), a clamping plate (14), a driving gear (15) and an adjusting rod (16); the linkage gear (8) is rotatably arranged inside the clamping shell (6); the linkage gear (8) is meshed and connected with the driving gear (15); the driving gear (15) is rotatably arranged inside the clamping shell (6); the adjusting rod (16) extends through the end portion of the clamping shell (6) and is fixedly connected with the driving gear (15); a second hole is opened inside the linkage gear (8) A groove (9) and a strip groove (10), wherein at least three strip grooves (10) are provided and are distributed in a circular array along the second hole groove (9), an arc groove (17) is opened on one side surface of the clamping shell (6), one end of the sliding rod (11) is penetrated and arranged in the strip groove (10), and the other end is slidably arranged in the second hole groove (9), and the connecting rod (13) is slidably arranged on the inner wall surface of the clamping shell (6) through the positioning ring (12), one end of the connecting rod (13) is movably sleeved on the outside of the sliding rod (11), and the other end is fixedly connected to the clamping plate (14); The linkage gear (8) and the clamping shell (6) are coaxially arranged, and the guide ring (5) and the clamping shell (6) are coaxially arranged; The second clamping mechanism comprises a mounting shell (19), a screw rod (20) and a threaded sleeve block (21); the mounting shell (19) is fixedly connected to the driving shaft (18); the screw rod (20) is a bidirectional screw rod and is rotatably arranged in the mounting shell (19); a pair of threaded sleeve blocks (21) are respectively threadedly sleeved on both ends of the screw rod (20); and a clamping member is fixedly installed on one side of the threaded sleeve block (21); The central axis of the clamping shell (6) passes through the midpoint of the line connecting the two threaded sleeves (21); The clamping member comprises a clamping frame (22), a first spring (23) and a push rod (24); the threaded sleeve (21) is fixedly connected to the clamping frame (22); one end of the push rod (24) movably penetrates and extends into the interior of the clamping frame (22); one end of the first spring (23) is fixedly connected to the interior of the push rod (24), and the other end is fixedly connected to the clamping frame (22); The inner surfaces of the two clamping frames (22) are both fixedly mounted with anti-slip pads; Mutually matching fasteners are fixedly installed between the clamping shell (6) and the mounting shell (19); The fastener comprises a positioning block (25), a fixing box (26), a second spring (27) and a docking rod (28); the fixing box (26) is fixedly mounted on a side of the clamping shell (6) close to the mounting shell (19); one end of the docking rod (28) is slidably arranged inside the fixing box (26); one end of the second spring (27) is fixedly connected to the fixing box (26) and the other end is fixedly connected to the docking rod (28); the positioning block (25) is fixedly mounted on one side of the mounting shell (19); the positioning block (25) can be matched and connected with the other end of the docking rod (28); S2: When clamping the flange, first pull a push rod (24) so ​​that the push rod (24) matches with any hole inside the flange. Under the elastic support of the first spring (23), the end of the push rod (24) can limit the flange so that the flange is restricted on the clamping frame (22). Then rotate the screw rod (20). The screw rod (20) drives the two threaded sleeves (21) to approach each other at the same time. Finally, adjust another push rod (24) so ​​that the push rod (24) matches with the hole inside the flange that is opposite to the hole in S1. The flange is fixed. By adjusting the distance between the threaded sleeves (21), flanges of different diameters can be clamped and fixed. The central axis of the fixed flange always passes through the midpoint of the line between the two threaded sleeves (21). In addition, whether it is a circular flange or a square flange, the push rod (24) is used to limit and fix the hole for clamping. Therefore, the device is suitable for both square flanges and circular flanges. S3: When clamping the steel pipe, the steel pipe is placed in the first hole groove (7) and the second hole groove (9), and the adjusting rod (16) is rotated. The adjusting rod (16) drives the driving gear (15) to rotate. The driving gear (15) can drive the linkage gear (8) to rotate. The linkage gear (8) drives the bar groove (10) to rotate. The bar groove (10) rotates to generate a force to drive the sliding rod (11) to rotate. Since the arc groove (17) is fixed, the sliding rod (11) is subjected to the force of the inner wall of the bar groove (10) and is also restricted by the inner wall of the arc groove (17). This causes the sliding rod (11) to rotate. While rotating along the strip groove (10), the sliding rod (11) also slides in the arc groove (17), so the position of the sliding rod (11) in the strip groove (10) also changes. When the sliding rod (11) moves, it drives the connecting rod (13) and the clamping plate (14) to move, so that steel pipes of different diameters can be clamped, and the central axis of the steel pipe can always coincide with the central axis of the clamping shell (6). Because the central axis of the clamping shell (6) passes through the midpoint of the line connecting the two threaded sleeves (21), the central axes of the steel pipe and the flange coincide, ensuring that the steel pipe and the flange are coaxially arranged and the matching is more accurate. S4: When the steel pipe and the flange are to be matched, the moving mechanism (30) is first started to drive the slider (3) to move. The movement of the slider (3) drives the support arc frame (4) to move. The movement of the support arc frame (4) can drive the clamping shell (6) to move through the guide ring (5). The movement of the clamping shell (6) can drive the steel pipe to move. When the clamping shell (6) moves close to the installation shell (19), the clamping shell (6) is rotated so that the docking rod (28) and the positioning block (25) cooperate with each other. If the steel pipe is a straight pipe, there is no need to adjust the angle of the steel pipe again. If the steel pipe is a curved pipe and the flange is a square flange, in this case, there are generally requirements for the angle between the steel pipe and the flange. In this case, it is necessary to loosen the clamping plate (14) and the steel pipe by rotating the adjustment rod (16) to adjust the angle of the steel pipe again. After the adjustment is completed, the moving mechanism (30) continues to drive the slider (3) to move. The movement of the slider (3) drives the steel pipe to contact and fit the flange. S5: During welding, while the welding gun assembly (29) is welding, an external power device is started to drive the driving shaft (18) to rotate. The driving shaft (18) rotates and drives the mounting shell (19). The mounting shell (19) rotates and drives the flange to rotate through the clamping frame (22). The mounting shell (19) rotates and drives the positioning block (25). The positioning block (25) rotates and drives the docking rod (28). The docking rod (28) rotates and drives the fixing box (26). The fixing box (26) rotates and drives the clamping shell (6). The clamping shell (6) rotates and drives the steel pipe to rotate. The steel pipe and the flange can rotate synchronously, thereby improving the welding accuracy of the steel pipe and the flange.

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