Butt joint positioning device for large pipeline welding
By designing a large-scale pipeline welding butt positioning device including base, track, positioning assembly and docking assembly, the problem that traditional manual positioning is difficult to ensure accuracy and pipeline displacement during welding is solved, and accurate butt and stable welding of the pipeline is achieved.
Patent Information
- Application Number
- CN202510225933.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-05-13
AI Technical Summary
In large-scale pipeline welding projects, traditional positioning methods rely on manual adjustments, making it difficult to ensure the accuracy of pipeline docking. In the welding process, the pipeline is easily displaced due to factors such as welding stress and vibration, which affects the welding quality.
A docking positioning device for large pipe welding is designed, including base, track, positioning assembly and docking assembly. The first motor drives the screw to rotate, and drives the pipe to move on the track; the positioning component realizes precise positioning and rotation of the pipe through the rotating member and the transmission member; the docking component realizes precise docking and stable support of the pipe through the arc-shaped fixing plate and the reinforcement.
The device can accurately locate and fix large pipes, ensure accurate pipe position during welding, reduce problems such as welding misalignment and eccentricity, and improve welding quality and overall performance of the pipeline system.
Smart Images
Figure CN119973542A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of large-scale pipeline welding, in particular to a butt-jointing positioning device for large-scale pipeline welding. Background Art
[0002] In large-scale pipeline welding projects, ensuring accurate pipe docking and stable positioning is a key prerequisite for ensuring welding quality.
[0003] Traditional pipeline positioning methods often rely on manual adjustment of pipeline positions to achieve docking, which not only consumes a lot of manpower, but also makes it difficult to ensure the accuracy of pipeline docking due to the limitations of manual operation. For example, in some large-scale construction projects or petrochemical pipeline laying projects, the pipelines are large in diameter and heavy in weight, making it extremely difficult to manually move and adjust the pipeline positions, and it is difficult to accurately align the axes of the two pipelines, resulting in problems such as misalignment and eccentricity of the pipelines after welding, affecting the overall performance and safety of the pipeline system.
[0004] Traditional methods of fixing large pipelines mostly use simple clamps or support structures. During the welding process, due to factors such as welding stress and vibration, the pipeline is prone to displacement, making it difficult to maintain a stable position of the pipeline during welding, which in turn affects the welding quality and increases subsequent maintenance costs and safety hazards. Summary of the invention
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a large-scale pipeline welding docking positioning device, comprising: A base, tracks are fixedly installed on both sides of the top of the base, a first motor is fixedly installed on both ends of the base through a bracket, a screw rod is fixedly connected to the output end of the first motor, and the first motor drives the screw rod to rotate, thereby driving the pipeline to move on the track; A positioning assembly, which is slidably mounted on the top of the track. There are two positioning assemblies, which are used to position, fix and rotate the pipeline to facilitate subsequent docking and welding; A docking assembly, wherein the docking assembly is fixedly installed in the middle of the top of the base, the positioning assembly is symmetrically arranged on both sides of the docking assembly, a welding gun is fixedly installed in the middle of the outer surface of the docking assembly through a bracket, the docking assembly docks two pipes and provides a welding position, and the welding gun performs welding operations on the docked pipes; The cam is an angular channel formed between a pair of camshafts and a pair of camshafts, and the camshafts are connected to a pair of camshafts which are connected to the camshafts. The camshafts are connected to the pair of camshafts and a pair of camshafts are connected to the camshafts. The camshafts are connected to the pair of camshafts and a pair of camshafts are connected to the camshafts.
[0006] Preferably, the rotating member comprises a rotating drum and a pressure plate, a toothed block is fixedly mounted on the outer surface of the rotating drum, and annular slide rails are fixedly mounted on both sides of the rotating drum.
[0007] Preferably, an annular slide groove is provided on the opposite surface of the fixed ring, and the annular slide rail is rotatably installed inside the annular slide groove. The matching arrangement of the annular slide rail and the annular slide groove makes the rotation of the drum more stable.
[0008] Preferably, the middle part of the pressure plate is rotatably installed on the inner wall of the drum via a rotating shaft, a compression spring is fixedly connected between one end of the pressure plate and the inner wall of the drum, the compression spring is arranged at the feed end of the drum, the compression spring makes the pressure plate tilted, a friction block is fixedly installed on the surface of the pressure plate, the friction block increases the friction with the pipeline to fix the pipeline.
[0009] Preferably, the number of the pressure plates is eight, and the eight pressure plates are evenly distributed inside the drum, an arc-shaped bent plate is fixedly connected between adjacent pressure plates, a buffer air bag is fixedly installed on the surface of the arc-shaped bent plate, and multiple pressure plates cooperate with the arc-shaped bent plate and the buffer air bag to fix the pipeline and provide buffer protection.
[0010] Preferably, the transmission member includes a supporting block, which is fixedly mounted on the side of the first supporting bracket, and a second motor is fixedly mounted on the top of the supporting block through a bracket, and an output end of the second motor is fixedly connected to a transmission shaft, and a gear is fixedly mounted on the outer surface of the transmission shaft, and the gear is meshed with a toothed block on the surface of the drum to transmit power to rotate the drum.
[0011] Preferably, the docking assembly includes a second supporting bracket, which is fixedly mounted on the top in the middle of the base, and an arc-shaped fixing plate is fixedly mounted on the upper surface of the second supporting bracket. There are two arc-shaped fixing plates, and an arc-shaped rotating plate is rotatably mounted on one end of the arc-shaped fixing plate through a rotating shaft. A baffle is fixedly mounted on the edge of the opposite surface of the arc-shaped rotating plate, and the welding gun is fixedly mounted on the edge of the baffle through a bracket.
[0012] Preferably, the arc-shaped fixed plate and the arc-shaped rotating plate are respectively fixedly connected with a second connecting plate and a first connecting plate at one end away from the rotating shaft, and second threaded holes are provided on the surfaces of the second connecting plate and the first connecting plate, and locking bolts are detachably installed inside the second threaded holes.
[0013] Preferably, the inner curved surfaces of the arc-shaped fixed plate and the arc-shaped rotating plate are both installed with reinforcements, and the reinforcements are evenly distributed on the surfaces of the arc-shaped fixed plate and the arc-shaped rotating plate. The reinforcements enhance the fixation and support of the pipeline, making the pipeline welding process more stable.
[0014] Preferably, the reinforcement comprises a damping rod and a special-shaped roller, the damping rod is fixedly mounted on both sides of the inner curved surface of the arc-shaped fixed plate and the arc-shaped rotating plate, the other end of the damping rod is rotatably mounted on a fixing frame via a rotating shaft, a rotating rod is rotatably mounted between the fixing frames, and the special-shaped roller is fixedly mounted on the outer surface of the rotating rod.
[0015] The present invention provides a butt-jointing positioning device for large-scale pipeline welding, which has the following beneficial effects: 1. The docking positioning device for large-scale pipeline welding is provided with a rotating part in the positioning assembly. The pressure plate in the rotating drum is installed through a rotating shaft and a compression spring. There are friction blocks on the surface. The eight pressure plates are evenly distributed and connected through an arc-shaped bent plate. A buffer airbag is installed on the inner curved surface of the arc-shaped bent plate. When working, the pipeline is placed in the rotating drum, and the compression spring compresses and pushes the pressure plate, so that the friction block presses against the pipeline. This structure can firmly fix large pipelines, the buffer airbag can adapt to the shape of the pipeline and provide buffer protection, and the rotating part improves the fixing stability of the pipeline to ensure the accurate position of the pipeline during welding.
[0016] Second, the docking positioning device for large-scale pipeline welding, through the setting of the transmission parts, the second motor drives the gear to rotate, so that the drum rotates, and the pipeline inside the drum rotates synchronously. Since the pipeline to be welded is placed inside the drum, the rotation of the drum can drive the pipeline to rotate together. This design brings great convenience to the welding work. During the welding process, the operator can flexibly adjust the rotation speed according to actual needs, so as to ensure that the welding work can evenly cover all parts of the pipeline. Compared with the traditional welding method, this method can make the welding operation uniform and stable, effectively avoid the problem of uneven welding caused by the limitation of the welding position, significantly improve the welding quality, and make the welded pipeline more firm and durable.
[0017] 3. The docking positioning device for large-scale pipeline welding, through the arrangement of an arc-shaped fixed plate and an arc-shaped rotating plate in the docking assembly, the arc-shaped fixed plate and the arc-shaped rotating plate are connected by a rotating shaft, and a first connecting plate and a second connecting plate are respectively provided at the end away from the rotating shaft, which are fixed by locking bolts. The docking ends of the two pipes can be accurately aligned and fixed, thereby ensuring the accuracy of pipeline docking, reducing problems such as welding misalignment and eccentricity, and improving welding quality and the overall performance of the pipeline system.
[0018] 4. The docking and positioning device for large-scale pipeline welding has a damping rod fixed on both sides of the inner curved surface of the arc-shaped fixed plate and the arc-shaped rotating plate through the setting of the reinforcement piece, and the other end is connected to the fixing frame. The rotating rod is rotatably installed between the fixing frames, and the special-shaped roller is installed on the rotating rod. When the pipeline rotates, the damping rod provides elastic support, and the special-shaped roller contacts the pipeline and rotates on its surface. During the docking and rotation process of the pipeline, the reinforcement piece plays a supporting role, stabilizes the position of the pipeline, enhances the stability of the pipeline during the welding process, and reduces the risk of welding defects caused by vibration or displacement.
[0019] 5. The docking positioning device for large-scale pipeline welding is provided with a base, a track, a first motor and a screw rod. When the first motor is working, the screw rod rotates to drive the positioning component to move along the track. The position of the positioning component can be flexibly adjusted to meet the docking requirements of pipelines of different lengths and the pipeline can be moved to the docking component, thereby improving the applicability of the device to pipelines of different lengths, greatly improving work efficiency, and making the entire welding workflow smoother and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the appearance of the present invention; Figure 3 This is a schematic diagram of the positioning assembly structure of the present invention; Figure 4 It is a schematic diagram of the structure of the fixing ring of the present invention; Figure 5 It is a schematic diagram of the structure of the rotating part of the present invention; Figure 6 This is a schematic diagram of the internal structure of the rotating part of the present invention; Figure 7 It is a schematic diagram of the transmission structure of the present invention; Figure 8 This is a schematic diagram of the docking assembly structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the reinforcement member of the present invention.
[0021] In the figure: 1, base; 2, track; 3, first motor; 4, screw rod; 5, positioning assembly; 51, first support bracket; 52, first threaded hole; 53, slide groove; 54, fixed ring; 55, rotating member; 551, rotating drum; 552, toothed block; 553, annular slide rail; 554, pressure plate; 555, friction block; 556, compression spring; 557, arc bent plate; 558, cushioning airbag; 56, transmission member; 561, support block; 562, The second motor; 563, the transmission shaft; 564, the gear; 57, the receiving groove; 58, the annular slide groove; 6, the docking assembly; 61, the second supporting bracket; 62, the arc-shaped fixed plate; 63, the arc-shaped rotating plate; 64, the baffle; 65, the first connecting plate; 66, the second connecting plate; 67, the second threaded hole; 68, the locking bolt; 69, the reinforcement; 691, the damping rod; 692, the fixing frame; 693, the special-shaped roller; 694, the rotating rod; 7, the welding gun. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] The first embodiment, as Figure 1 to Figure 2 As shown, the present invention provides a technical solution: a docking positioning device for large-scale pipeline welding, comprising a base 1, tracks 2 are fixedly installed on both sides of the top of the base 1, a first motor 3 is fixedly installed on both ends of the base 1 through a bracket, a screw rod 4 is fixedly connected to the output end of the first motor 3, the first motor 3 drives the screw rod 4 to rotate, thereby driving the pipeline to move on the track 2, thereby improving the applicability of the device to pipelines of different lengths, greatly improving the work efficiency, and making the entire welding workflow smoother and more efficient.
[0024] The second embodiment is based on the first embodiment. Figures 1 to 7 As shown, the positioning assembly 5 is slidably installed on the top of the track 2. There are two positioning assemblies 5. The positioning assembly 5 positions, fixes and rotates the pipeline to facilitate subsequent docking and welding. The positioning assembly 5 includes a first support bracket 51, a rotating member 55 and a transmission member 56. The first support bracket 51 carries and fixes the rotating member 55 and the transmission member 56. The rotating member 55 fixes and rotates the pipeline and assists the pipeline to dock. The transmission member 56 drives the rotating member 55 to rotate. The transmission member 56 is installed on the side of the first support bracket 51. A first threaded hole 52 is opened in the middle of the bottom of the first support bracket 51. The first support bracket 51 is transmission-mounted on the outer surface of the screw rod 4 through the first threaded hole 52. Slide grooves 53 are opened on both sides of the bottom of the first support bracket 51. The first support bracket 51 is slidably installed on the top of the track 2 through the slide grooves 53. Fixed rings 54 are fixedly installed on both sides of the upper surface of the first support bracket 51. A receiving groove 57 is opened on the upper surface of the first support bracket 51, and the receiving groove 57 is arranged between the fixed rings 54. The receiving groove 57 is used to accommodate the rotation of the rotating member 55. The rotating member 55 is rotatably installed between the fixed rings 54. The rotating member 55 includes a rotating drum 551 and a pressing plate 554. A tooth block 552 is fixedly installed on the outer surface of the rotating drum 551. Annular slide rails 553 are fixedly installed on both sides of the rotating drum 551. An annular slide groove 58 is provided on the opposite side of the fixing ring 54, and the annular slide rail 553 is rotatably mounted inside the annular slide groove 58. The matching arrangement of the annular slide rail 553 and the annular slide groove 58 makes the pipe more stable when rotating, thereby improving the welding quality; The middle of the pressing plate 554 is rotatably mounted on the inner wall of the rotating drum 551 through a rotating shaft. A compression spring 556 is fixedly connected between one end of the pressing plate 554 and the inner wall of the rotating drum 551. The compression spring 556 is arranged at the feeding end of the rotating drum 551. The compression spring 556 makes the pressing plate 554 tilted. A friction block 555 is fixedly mounted on the surface of the pressing plate 554. The friction block 555 increases the friction force with the pipeline and fixes the pipeline. When the pipeline enters, the pressing plate 554 is squeezed. The pressing plate 554 rotates on the surface of the rotating shaft under the buffering of the compression spring 556. The friction block 555 on the surface of the pressing plate 554 fits the pipeline to the maximum extent. There are eight pressing plates 554, and the eight pressing plates 554 are evenly distributed inside the rotating drum 551. An arc-shaped bent plate 557 is fixedly connected between adjacent pressing plates 554, and a buffer airbag 558 is fixedly installed on the surface of the arc-shaped bent plate 557. Multiple pressing plates 554 cooperate with the arc-shaped bent plate 557 and the buffer airbag 558. When the pipeline is placed in the rotating drum 551, the pressing plates 554 in the rotating drum 551 are tightly pressed against the outer wall of the pipeline through the friction block 555 under the action of the compression spring 556. The arc-shaped bent plate 557 and the buffer airbag 558 between adjacent pressing plates 554 further adapt to the shape of the pipeline to fix it and provide buffer protection; The transmission member 56 includes a supporting block 561, which is fixedly mounted on the side of the first supporting bracket 51. A second motor 562 is fixedly mounted on the top of the supporting block 561 through a bracket. A transmission shaft 563 is fixedly connected to the output end of the second motor 562. A gear 564 is fixedly mounted on the outer surface of the transmission shaft 563. The gear 564 meshes with the toothed block 552 on the surface of the rotating drum 551. When the second motor 562 is working, the second motor 562 drives the transmission shaft 563 and the gear 564 to rotate. The gear 564 meshes with the toothed block 552 on the outer surface of the rotating drum 551. The engagement causes the rotating drum 551 to drive the pipeline to rotate, thereby adjusting the pipeline welding position. The rotating drum 551 rotates stably in the annular slide groove 58 of the fixed ring 54 through the annular slide rail 553. During the welding process, the operator can flexibly adjust the rotation speed according to actual needs, thereby ensuring that the welding work can evenly cover various parts of the pipeline. Compared with the traditional welding method, this method can make the welding operation uniform and stable, effectively avoid the problem of uneven welding caused by the limitation of the welding position, significantly improve the welding quality, and make the welded pipeline more firm and durable.
[0025] The third embodiment is based on the first and second embodiments. Figures 1 to 9 As shown, the docking assembly 6 is fixedly installed in the middle of the top of the base 1, the positioning assembly 5 is symmetrically arranged on both sides of the docking assembly 6, and a welding gun 7 is fixedly installed in the middle of the outer surface of the docking assembly 6 through a bracket. The docking assembly 6 docks two pipes and provides a welding position, and the welding gun 7 performs welding operations on the docked pipes; The docking assembly 6 includes a second support bracket 61, which is fixedly mounted on the top of the middle of the base 1. An arc-shaped fixing plate 62 is fixedly mounted on the upper surface of the second support bracket 61. There are two arc-shaped fixing plates 62. An arc-shaped rotating plate 63 is rotatably mounted on one end of the arc-shaped fixing plate 62 through a rotating shaft. A baffle 64 is fixedly mounted on the edge of the opposite surface of the arc-shaped rotating plate 63. The welding gun 7 is fixedly mounted on the edge of the baffle 64 through a bracket. The baffle 64 prevents the splashing of waste during welding. The arc-shaped fixed plate 62 and the arc-shaped rotating plate 63 are respectively fixedly connected with the second connecting plate 66 and the first connecting plate 65 at one end away from the rotating shaft. The second connecting plate 66 and the first connecting plate 65 are both provided with second threaded holes 67 on their surfaces. The locking bolts 68 are detachably installed inside the second threaded holes 67. The locking bolts 68 are used to tighten the arc-shaped fixed plate 62 and the arc-shaped rotating plate 63 to clamp the pipe, so that the pipe welding process is more stable. The inner curved surfaces of the arc-shaped fixed plate 62 and the arc-shaped rotating plate 63 are both installed with reinforcement pieces 69, and the reinforcement pieces 69 are evenly distributed on the surfaces of the arc-shaped fixed plate 62 and the arc-shaped rotating plate 63, and the reinforcement pieces 69 enhance the fixation and support of the pipeline; The reinforcement 69 includes a damping rod 691 and a special-shaped roller 693. One end of the special-shaped roller 693 is cylindrical to facilitate the rotation of the pipeline, and the other end is an arc-shaped cone to facilitate the sliding entry of the pipeline. The damping rod 691 is fixedly installed on both sides of the inner curved surface of the arc-shaped fixed plate 62 and the arc-shaped rotating plate 63. The other end of the damping rod 691 is rotatably installed with a fixing frame 692 through a rotating shaft, and a rotating rod 694 is rotatably installed between the fixing frames 692. The special-shaped roller 693 is fixedly installed on the outer surface of the rotating rod 694. When the pipeline slides in, the damping rod 691 contracts and provides elastic buffering, and the pipeline contacts the conical end of the special-shaped roller 693 to slide. When the pipeline rotates, the damping rod 691 provides elastic support, and the special-shaped roller 693 contacts the pipeline and assists in adjusting the position, so that the pipeline can rotate between the arc-shaped fixed plate 62 and the arc-shaped rotating plate 63.
[0026] When in use, the operator rotates the arc-shaped rotating plate 63 to keep it in an open state, and one end of the pipe is placed in the rotating drum 551 of the positioning assembly 5. The pressing plate 554 in the rotating drum 551 is tightly pressed against the outer wall of the pipe through the friction block 555 under the action of the compression spring 556. The arc-shaped curved plate 557 and the buffer airbag 558 between the adjacent pressing plates 554 further adapt to the shape of the pipe and provide buffering. The first motor 3 is started, and the first motor 3 drives the screw rod 4 to rotate. Since the first support bracket 51 is connected to the screw rod 4 through the first threaded hole 52, and the bottom slide groove 53 slides on the track 2, the two positioning components 5 move toward each other along the track 2 until they are preliminarily docked. At this time, the arc-shaped rotating plate 63 is closed and fixed through the second threaded holes 67 and locking bolts 68 on the first connecting plate 65 and the second connecting plate 66, so that the butt ends of the two pipes are accurately aligned. At this time, the second motor 562 is started, and the second motor 562 drives the transmission shaft 563 and the gear 564 to rotate. The gear 564 is engaged with the toothed block 552 on the outer surface of the rotating drum 551, so that the rotating drum 551 drives the pipe to rotate, and the welding position of the pipe is adjusted. The rotating drum 551 rotates in the annular groove 58 of the fixing ring 54 through the annular slide rail 553; The reinforcement 69 in the docking assembly 6 provides a certain degree of fixation and support when the pipeline rotates to ensure a stable position. The pipeline rotates on the surface of the special-shaped roller 693, and the welding gun 7 is used to weld the rotating pipeline.
[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A butt-jointing positioning device for large-scale pipeline welding, characterized in that: include: A base (1), rails (2) being fixedly mounted on both sides of the top of the base (1), a first motor (3) being fixedly mounted on both ends of the base (1) via brackets, and a lead screw (4) being fixedly connected to an output end of the first motor (3); A positioning assembly (5), wherein the positioning assembly (5) is slidably mounted on the top of the track (2), and the number of the positioning assemblies (5) is two; A docking assembly (6), the docking assembly (6) being fixedly mounted in the middle of the top of the base (1), the positioning assemblies (5) being symmetrically arranged on both sides of the docking assembly (6), and a welding gun (7) being fixedly mounted in the middle of the outer surface of the docking assembly (6) via a bracket; The positioning assembly (5) comprises a first support frame (51), a rotating member (55) and a transmission member (56), wherein the transmission member (56) is mounted on the side of the first support frame (51), a first threaded hole (52) is provided in the middle of the bottom of the first support frame (51), the first support frame (51) is transmission-mounted on the outer surface of the screw rod (4) through the first threaded hole (52), two sides of the bottom of the first support frame (51) are provided with sliding grooves (53), the first support frame (51) is slidably mounted on the top of the track (2) through the sliding grooves (53), two sides of the upper surface of the first support frame (51) are fixedly mounted with fixing rings (54), the upper surface of the first support frame (51) is provided with a receiving groove (57), and the receiving groove (57) is arranged between the fixing rings (54), and the rotating member (55) is rotationally mounted between the fixing rings (54).
2. A large-scale pipeline welding butt-jointing positioning device according to claim 1, characterized in that: The rotating member (55) comprises a rotating drum (551) and a pressing plate (554); a toothed block (552) is fixedly mounted on the outer surface of the rotating drum (551); and annular slide rails (553) are fixedly mounted on both sides of the rotating drum (551).
3. A large-scale pipeline welding butt-jointing positioning device according to claim 2, characterized in that: An annular slide groove (58) is provided on the opposite surface of the fixing ring (54), and the annular slide rail (553) is rotatably mounted inside the annular slide groove (58).
4. A large-scale pipeline welding butt-jointing positioning device according to claim 2, characterized in that: The middle of the pressing plate (554) is rotatably mounted on the inner wall of the rotating drum (551) via a rotating shaft, a compression spring (556) is fixedly connected between one end of the pressing plate (554) and the inner wall of the rotating drum (551), and the compression spring (556) is arranged at the feeding end of the rotating drum (551), and a friction block (555) is fixedly mounted on the surface of the pressing plate (554).
5. A large-scale pipeline welding butt-jointing positioning device according to claim 4, characterized in that: The number of the pressing plates (554) is eight, and the eight pressing plates (554) are evenly distributed inside the rotating drum (551); arc-shaped bent plates (557) are fixedly connected between the pressing plates (554); and a buffer airbag (558) is fixedly installed on the surface of the arc-shaped bent plates (557).
6. A large-scale pipeline welding butt-jointing positioning device according to claim 5, characterized in that: The transmission member (56) comprises a supporting block (561), wherein the supporting block (561) is fixedly mounted on a side surface of the first supporting bracket (51), a second motor (562) is fixedly mounted on the top of the supporting block (561) via a bracket, an output end of the second motor (562) is fixedly connected to a transmission shaft (563), a gear (564) is fixedly mounted on the outer surface of the transmission shaft (563), and the gear (564) is meshed with a toothed block (552) on the surface of the rotating drum (551).
7. The butt-jointing positioning device for large-scale pipeline welding according to claim 1 is characterized in that: The docking assembly (6) comprises a second support bracket (61), the second support bracket (61) is fixedly mounted on the top of the middle of the base (1), an arc-shaped fixing plate (62) is fixedly mounted on the upper surface of the second support bracket (61), the number of the arc-shaped fixing plates (62) is two, one end of the arc-shaped fixing plate (62) is rotatably mounted with an arc-shaped rotating plate (63) via a rotating shaft, a baffle (64) is fixedly mounted on the edge of the opposite surface of the arc-shaped rotating plate (63), and the welding gun (7) is fixedly mounted on the edge of the baffle (64) via a bracket.
8. A large-scale pipeline welding butt-jointing positioning device according to claim 7, characterized in that: The arc-shaped fixed plate (62) and the arc-shaped rotating plate (63) are respectively fixedly connected to a second connecting plate (66) and a first connecting plate (65) at one end away from the rotating shaft, and second threaded holes (67) are provided on the surfaces of the second connecting plate (66) and the first connecting plate (65), and locking bolts (68) are detachably installed inside the second threaded holes (67).
9. A large-scale pipeline welding butt-jointing positioning device according to claim 8, characterized in that: The inner curved surfaces of the arc-shaped fixed plate (62) and the arc-shaped rotating plate (63) are both installed with reinforcement pieces (69), and the reinforcement pieces (69) are evenly distributed on the surfaces of the arc-shaped fixed plate (62) and the arc-shaped rotating plate (63).
10. A large-scale pipeline welding butt-jointing positioning device according to claim 9, characterized in that: The reinforcement member (69) comprises a damping rod (691) and a special-shaped roller (693); the damping rod (691) is fixedly mounted on both sides of the inner curved surface of the arc-shaped fixed plate (62) and the arc-shaped rotating plate (63); the other end of the damping rod (691) is rotatably mounted on a fixing frame (692) via a rotating shaft; a rotating rod (694) is rotatably mounted between the fixing frames (692); and the special-shaped roller (693) is fixedly mounted on the outer surface of the rotating rod (694).