Steel structure pipeline butt welding auxiliary device and using method

Abstract

The invention provides a steel structure pipeline butt welding auxiliary device and a using method.The auxiliary device comprises a base table, a lifting supporting plate and a clamping and rotating assembly are arranged on the base table, and the lifting supporting plate can move in the height direction of the base table and is used for supporting a to-be-welded pipeline; the clamping and rotating assembly is used for clamping and driving a to-be-welded pipeline to rotate around the axis of the clamping and rotating assembly, the bottom end of the clamping and rotating assembly is connected with the base table through a transverse moving assembly, and the transverse moving assembly can drive the clamping and rotating assembly to be close to or away from the lifting supporting plate. Through the synergistic effect of the clamping and rotating assembly and the lifting supporting plate, the butt joint precision of the to-be-welded pipeline can be greatly improved, through automatic clamping and rotating, the welding quality and the welding efficiency are improved, and the working intensity of workers is reduced. By adjusting and controlling the telescopic amplitude of the telescopic clamping and placing rod and the telescopic lifting rod, the automation degree of the process of clamping and placing the to-be-welded pipeline is improved, the levelness of the axis of the to-be-welded pipeline and the coaxiality of the to-be-welded pipeline and the hollow sleeve are accurately adjusted and controlled, and the butt welding precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure pipeline welding, and in particular to a steel structure pipeline butt welding auxiliary device and a use method thereof. Background Art

[0002] Pipes are widely used, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, water conservancy projects and various industrial devices. Pipes are usually manufactured in a certain length during production, and they often need to be cut or welded to meet specific needs during actual use.

[0003] At present, there are some pipeline welding auxiliary devices on the market, such as a pipeline welding leveling device with Chinese patent application number 2023200241021. The device includes a base plate, a support rod, a balance rod and a fixing assembly. A balance rod is provided on the base plate for limiting the position of the pipeline. The balance rod can be pressed against the side wall of the pipeline through the fixing assembly, so that the two pipelines to be welded remain parallel and complete the docking, reducing the misalignment of the pipeline and facilitating the welding operation.

[0004] However, this pipeline welding leveling device has some shortcomings. First, during use, it is necessary to manually turn multiple fixing bolts to push the rubber block to fix the pipeline, which is cumbersome and time-consuming. Secondly, the device is not convenient for rotating the pipeline during welding, which greatly reduces the welding efficiency, especially when circumferential welding is required. In addition, the device lacks the function of accurately adjusting the height of the pipeline, which may lead to inaccurate welding position and affect the welding quality.

[0005] On the other hand, existing pipeline welding auxiliary devices usually lack flexibility and versatility. They are often only suitable for pipelines of specific sizes or types, and it is difficult to meet the welding needs of pipelines of different specifications. At the same time, most devices cannot realize automatic clamping and rotation of pipelines, which not only increases the labor intensity of operators, but also makes it difficult to ensure the consistency and efficiency of welding.

[0006] In view of the above problems, the existing technology needs to be improved urgently. Summary of the invention

[0007] The object of the present invention is to provide a steel structure pipeline butt welding auxiliary device and a use method to solve the problems in the above background.

[0008] The technical solution adopted by the present invention is as follows: an auxiliary device for butt welding of steel structure pipelines, which includes a base platform. An elevating support plate and a clamping and rotating assembly are configured on the base platform. The elevating support plate can move along the height direction of the base platform to support the pipeline to be welded. The clamping and rotating assembly is used to clamp and drive the pipeline to be welded to rotate around its own axis. The bottom end of the clamping and rotating assembly is connected to the base platform through a transverse movement assembly, and the transverse movement assembly can drive the clamping and rotating assembly to approach or move away from the elevating support plate.

[0009] Preferably, the elevating support plate includes a first support block, a telescopic elevating rod, and an arc-shaped pipe support. The top and bottom ends of the telescopic elevating rod are respectively connected to the arc-shaped pipe support and the first support block. The bottom end of the first support block is connected to the base platform. The axis of the arc-shaped pipe support is parallel to the axis of the clamping and rotating assembly.

[0010] Preferably, a chute with an open top is configured on the base platform. The transverse movement assembly includes a bidirectional lead screw and sliders configured in the chute. The bidirectional lead screw is driven by a first servo motor to rotate. Two sets of threads with opposite directions on it are respectively screwed with two sets of the sliders. The tops of the two sets of sliders are respectively connected to different clamping and rotating assemblies.

[0011] Preferably, a first transmission groove is configured in the base platform. A first transmission shaft and a second transmission shaft are rotatably configured in the first transmission groove. They are respectively connected to the bidirectional lead screw and the first servo motor. A first worm gear is sleeved on the first transmission shaft. A first worm is coaxially configured on the second transmission shaft. The first worm gear meshes with the first worm.

[0012] Preferably, the clamping and rotating assembly includes a second support block, a hollow sleeve, an arc-shaped clamping hoop, and a second servo motor. The bottom end of the second support block is connected to the transverse movement assembly, and a receiving cavity is configured at the top. The receiving cavity has a first side opening and a second side opening opposite to each other. The first side opening faces the elevating support plate. The hollow sleeve is horizontally configured in the receiving cavity, and the axial two ends respectively correspond to the first side opening and the second side opening. The second servo motor can drive the hollow sleeve to rotate around its own axis. A plurality of arc-shaped clamping hoops are evenly distributed along the circumference of the hollow sleeve. The plurality of arc-shaped clamping hoops are respectively connected to the hollow sleeve through telescopic clamping and releasing rods. The telescopic clamping and releasing rods can drive the arc-shaped clamping hoops to move along the radial direction of the hollow sleeve.

[0013] Preferably, a transfer ring and a toothed ring are sleeved on the outer wall of the hollow sleeve. The transfer ring is rotatably connected to the inner wall of the receiving cavity. The toothed ring is meshed and connected to a transmission gear. The transmission gear is driven by the second servo motor to rotate.

[0014] Preferably, a second transmission groove and a third transmission groove are constructed in the support block 2, the second transmission groove is connected to the accommodating chamber for installing the transmission gear; the third transmission groove is connected to the second transmission groove for installing the second servo motor; the transmission gear is connected to the second servo motor through a third transmission shaft and a fourth transmission shaft, a second worm gear is outermostly provided on the third transmission shaft, a second worm is coaxially constructed on the fourth transmission shaft, and the second worm gear is meshed with the second worm.

[0015] Preferably, the arc-shaped clamp is located inside the hollow sleeve; one end of the telescopic clamping rod passes through the side wall of the hollow sleeve and is connected to the inner wall of the adapter ring.

[0016] The technical solution of the present invention also includes: a method of using the above-mentioned steel structure pipeline butt welding auxiliary device, which includes the steps of:

[0017] Put one end of the pipe to be welded through the hollow casing and put the other end on the lifting support plate;

[0018] Start the telescopic clamping rod and the telescopic lifting rod, and use the arc clamp and arc pipe support to change the height of the axial ends of the pipe to be welded until the axis of the pipe to be welded is horizontal and in line with the axis of the hollow casing;

[0019] Start the first servo motor, and use the bidirectional lead screw to drive the two sets of slide blocks to move closer to each other until the welding ends of the two pipes to be welded are accurately butted;

[0020] The second servo motor is started, and the pipe to be welded is driven to rotate by the clamping and rotating assembly to implement the circumferential welding.

[0021] The invention has the following beneficial effects: through the synergistic effect of the clamping and rotating assembly and the lifting and lowering support plate, the butt joint accuracy of the pipe to be welded can be greatly improved, and the welding quality and welding efficiency can be improved through automated clamping and rotation, and the work intensity of personnel can be reduced. By adjusting the telescopic clamping and lifting range of the telescopic lifting and lowering rod, the automation level of the process of clamping and placing the pipe to be welded can be improved, and the horizontality of the axis of the pipe to be welded and its coaxiality with the hollow casing can be accurately adjusted to improve the butt welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 is a structural diagram of a transverse movement assembly in an embodiment of the present invention;

[0024] Figure 3 is a structural diagram of a clamping and rotating assembly in an embodiment of the present invention;

[0025] In the figure:

[0026] 100, base; 101, slideway; 102, first transmission groove;

[0027] 200, lifting support plate; 201, support block 1; 202, telescopic lifting rod; 203, arc-shaped pipe support;

[0028] 300, transverse movement assembly; 301, bidirectional lead screw; 302, slider; 303, first servo motor; 304, first transmission shaft; 305, second transmission shaft; 306, first worm wheel; 307, first worm;

[0029] 400, clamping and rotating assembly; 401, supporting block 2; 402, accommodating cavity; 403, first side opening; 404, second side opening; 405, second transmission groove; 406, third transmission groove; 407, hollow sleeve; 408, arc-shaped clamp; 409, second servo motor; 410, telescopic clamping rod; 411, adapter ring; 412, gear ring; 413, transmission gear; 414, third transmission shaft; 415, fourth transmission shaft; 416, second worm wheel; 417, second worm. DETAILED DESCRIPTION

[0030] The technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] Reference Figure 1-3The present embodiment provides a steel structure pipeline butt welding auxiliary device, which includes a base 100, two sets of lifting and lowering plates 200, two sets of clamping and rotating components 400 and a transverse movement component 300. The lifting and lowering plates 200, the clamping and rotating components 400 and the transverse movement component 300 are all arranged on the base 100, the two sets of clamping and rotating components 400 are coaxially and relatively arranged, and the two sets of lifting and lowering plates 200 are respectively arranged on the separated sides of the two sets of clamping and rotating components 400; the lifting and lowering plates 200 can move along the height direction of the base 100 to support the pipeline to be welded; the clamping and rotating components 400 are used to clamp and drive the pipeline to be welded to rotate around its own axis, and its bottom end is connected to the base 100 through the transverse movement component 300, and the transverse movement component 300 can drive the clamping and rotating components 400 to approach or move away from the lifting and lowering plates 200.

[0033] When the above technical solution is used for construction, one end of the pipe to be welded is placed in the clamping assembly 400, and the other end is placed on the top of the lifting support plate 200. The height of the pipe to be welded is adjusted by lifting and lowering the lifting support plate 200 to ensure the quality of subsequent butt welding. After adjusting the pipe to be welded, the pipe to be welded is clamped by the clamping assembly 400, and then the two groups of clamping assemblies 400 are driven to approach each other by the transverse movement assembly 300, so that the welding ends of the two pipes to be welded are connected to each other. While welding, the clamping assembly 400 is used to drive the pipe to be welded to rotate around its own axis, so that the welders or welding machines in fixed positions can quickly perform circumferential welding on the welding ends of the steel structure pipes, thereby improving welding efficiency. Through the synergistic effect of the clamping assembly 400 and the lifting support plate 200, the butt welding accuracy of the pipe to be welded can be greatly improved, and the welding quality and efficiency can be improved by automated clamping and rotation, and the work intensity of the personnel can be reduced.

[0034] In this embodiment, the lifting support plate 200 includes a support block 201, a telescopic lifting rod 202 and an arc-shaped pipe support 203. The bottom end of the support block 201 is connected to the base 100, and the top end is connected to the telescopic lifting rod 202; the top end of the telescopic lifting rod 202 is connected to the arc-shaped pipe support 203, and the axis of the arc-shaped pipe support 203 is horizontal and parallel to the axis of the clamping and rotating assembly 400. During construction, according to the different diameters of the pipes to be welded, the telescopic degree of the telescopic lifting rod 202 is adjusted, and the height of the end of the pipe to be welded away from the clamping and rotating assembly 400 can be quickly adjusted so that it is at the same height as the axis of the clamping and rotating assembly 400, and then the clamping and rotating assembly 400 is driven to fix the other end of the pipe to be welded, which can ensure the horizontality of the axis of the pipe to be welded during welding and improve the accuracy of butt welding.

[0035] In this embodiment, a slide groove 101 with an open top is configured on the base 100, and the transverse movement assembly 300 includes a bidirectional lead screw 301 and a slider 302 configured in the slide groove 101. The bidirectional lead screw 301 is driven to rotate by a first servo motor 303, and two groups of threads in opposite directions are respectively threadedly connected to two groups of sliders 302, and the tops of the two groups of sliders 302 are respectively connected to different clamping and rotating assemblies 400. When the first servo motor 303 drives the bidirectional screw 301 to rotate, driven by the thread on the bidirectional screw 301, due to the abutment limit between the outer wall of the slider 302 and the inner wall of the slide groove 101 or the abutment limit between the bottom surface of the clamping and rotating assembly 400 and the top surface of the base 100 (the shape of the slider 302, the shape of the inner wall of the slide groove 101 and the bottom surface of the clamping and rotating assembly 400 can be selected by technical personnel in this field), the two groups of sliders 302 can move toward or away from each other, thereby driving the two groups of clamping and rotating assemblies 400 to move toward or away from each other, so that the pipes to be welded respectively clamped by the two groups are close to each other, or the two groups of clamping and rotating assemblies 400 are reset to wait for the clamping of the next group of pipes to be welded. Through the cooperation of the transverse movement assembly 300 and the clamping and rotating assembly 400, the docking efficiency of the steel pipes to be welded during the welding process can be improved and the labor intensity of this process can be reduced.

[0036] In addition, the base 100 is provided with a first transmission groove 102, in which a first transmission shaft 304 and a second transmission shaft 305 are rotatably provided, and the two are connected to the bidirectional lead screw 301 and the first servo motor 303 respectively, and a first worm wheel 306 is provided on the outer sleeve of the first transmission shaft 304, and a first worm 307 is coaxially provided on the second transmission shaft 305, and the first worm wheel 306 is meshed with the first worm 307. The meshing transmission mode of the first worm wheel 306 and the first worm 307 has high transmission efficiency and stability, can realize the stable rotation of the bidirectional lead screw 301, ensure the stable lateral movement of the clamping and rotating assembly 400, and improve the working efficiency and precision of the welding auxiliary device.

[0037] The above-mentioned clamping and rotating assembly 400 includes a support block 401, a hollow sleeve 407, an arc-shaped clamp 408 and a second servo motor 409. The bottom end of the support block 401 is connected to the transverse movement assembly 300, and a receiving chamber 402 is arranged at the top. The receiving chamber 402 has a first side opening 403 and a second side opening 404 relative to each other, and the first side opening 403 faces the lifting support plate 200; the hollow sleeve 407 is horizontally arranged in the receiving chamber 402, and the axial ends correspond to the first side opening 403 and the second side opening 404 respectively; the second servo motor 409 can drive the hollow sleeve 407 to rotate around its own axis; there are a plurality of arc-shaped clamps 408 evenly distributed along the circumference of the hollow sleeve 407, and the plurality of arc-shaped clamps 408 are respectively connected to the hollow sleeve 407 through telescopic clamping rods 410, and the telescopic clamping rods 410 can drive the arc-shaped clamp 408 to move radially along the hollow sleeve 407. Among them, the inner diameter of the hollow sleeve 407 is larger than the outer diameter of the pipe to be welded, one end of the pipe to be welded passes through the hollow sleeve 407, and its part located on the inner side or near the hollow sleeve 407 can be clamped by the arc clamp 408; when the height of one end of the pipe to be welded is changed by lifting the support plate 200, the multiple groups of telescopic clamping rods 410 connected to the multiple groups of arc clamps 408 act at the same time, so that the multiple groups of arc clamps 408 act synchronously, clamping the other end of the pipe to be welded, accurately controlling the horizontality of the axis of the pipe to be welded and its coaxiality with the clamping and rotating assembly 400, thereby improving the docking and welding accuracy of the pipe to be welded.

[0038] Before construction, the auxiliary device provided in this embodiment can be pre-set with adjustment parameters so that the movement amplitude of the arc clamp 408 and the movement amplitude of the arc pipe support 203 are adapted to the pipe diameter of the pipe to be welded that is clamped or supported, thereby increasing the applicability of the auxiliary device provided in this embodiment and making it suitable for butt welding construction of pipes to be welded with different pipe diameters. The movement amplitude of the arc clamp 408 and the movement amplitude of the arc pipe support 203 are respectively controlled by the telescopic clamping rod 410 and the telescopic lifting rod 202. During implementation, technicians in this field can select materials by themselves. For example, the telescopic clamping rod 410 and the telescopic lifting rod 202 are both electric telescopic rods, cylinders, hydraulic rods and other equipment. By presetting the matching state of the telescopic amplitude of the piston rod, the above-mentioned coordinated action is realized, the degree of automation of the process of clamping and placing the pipe to be welded is improved, and the horizontality of the axis of the pipe to be welded and its coaxiality with the hollow casing 407 are accurately controlled.

[0039] In order to avoid the pipe to be welded inside the hollow sleeve 407 and make the hollow sleeve 407 rotate smoothly around its own axis, refer to the attached Figure 3In this embodiment, an adapter ring 411 and a gear ring 412 are sleeved on the outer wall of the hollow sleeve 407, and the outer wall of the adapter ring 411 is directly rotated to connect with the inner wall of the accommodating chamber 402, and a gap is left between the outer wall of the hollow sleeve 407 and the inner wall of the accommodating chamber 402 to accommodate the gear ring 412 and help it rotate smoothly, and the gear ring 412 is meshed and connected to the transmission gear 413, and the transmission gear 413 is driven to rotate by the second servo motor 409. The adapter ring 411 is directly rotated to connect with the inner wall of the accommodating chamber 402, ensuring the stability and flexibility of the hollow sleeve 407 and the gear ring 412; the gear ring 412 is meshed with the transmission gear 413 and driven by the second servo motor 409, so that the precise rotation control of the hollow sleeve 407 can be achieved.

[0040] A second transmission groove 405 and a third transmission groove 406 are arranged in the support block 401. The second transmission groove 405 is connected to the accommodating chamber 402 for installing a transmission gear 413. The third transmission groove 406 is connected to the second transmission groove 405 for installing a second servo motor 409. The transmission gear 413 is connected to the second servo motor 409 through a third transmission shaft 414 and a fourth transmission shaft 415. A second worm gear 416 is arranged on the outer sleeve of the third transmission shaft 414. A second worm 417 is coaxially arranged on the fourth transmission shaft 415. The second worm gear 416 is meshed with the second worm 417. The meshing transmission mode of the second worm gear 416 and the second worm 417 has high transmission efficiency and stability, can realize the stable rotation of the hollow sleeve 407, and improves the working efficiency and precision of the welding auxiliary device.

[0041] In some specific implementation schemes, the arc-shaped clamp 408 is located on the inner side of the hollow sleeve 407, and one end of the telescopic clamp rod 410 passes through the side wall of the hollow sleeve 408 and is connected to the inner wall of the adapter ring 411. The side wall of the hollow sleeve 407 provides lateral support, protection and limitation for the telescopic clamp rod 410, thereby improving the service life of the device and the smoothness of the movement of the telescopic clamp rod 410.

[0042] The method of using the steel structure pipeline butt welding auxiliary device comprises the following steps:

[0043] Pass one end of the pipe to be welded through the hollow casing 407, and place the other end on the lifting support plate 200;

[0044] Start the telescopic clamping rod 410 and the telescopic lifting rod 202, and use the arc clamp 408 and the arc pipe support 203 to change the height of the axial ends of the pipe to be welded, until the axis of the pipe to be welded is horizontal and in line with the axis of the hollow casing 407;

[0045] The first servo motor 303 is started to drive the bidirectional lead screw 301 to rotate, and the two welding ends of the two pipes to be welded clamped by the two sets of clamping and rotating components 400 are driven to approach each other through the slider 302, and the two ends are accurately butted;

[0046] The welding ends of the two pipes to be welded are welded, and the second servo motor 409 is started to drive the hollow sleeve 407 to rotate around its own axis, thereby driving the pipes to be welded to rotate, thereby achieving efficient and accurate circumferential welding.

[0047] Compared with the prior art, the beneficial effects of the present invention include: through the synergistic effect of the clamping and rotating assembly 400 and the lifting support plate 200, the butt joint accuracy of the pipe to be welded can be greatly improved, and the welding quality and welding efficiency can be improved by automated clamping and rotation, and the work intensity of personnel can be reduced. By adjusting the telescopic range of the telescopic clamping rod 410 and the telescopic lifting rod 202, the automation level of the process of clamping and placing the pipe to be welded is improved, and the horizontality of the axis of the pipe to be welded and its coaxiality with the hollow casing 407 are accurately adjusted to improve the butt welding accuracy.

[0048] 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.

[0049] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A steel structure pipeline butt welding auxiliary device, characterized in that: It includes a base, on which a lifting support plate and a clamping and rotating assembly are arranged. The lifting support plate can move along the height direction of the base to support the pipe to be welded; the clamping and rotating assembly is used to clamp and drive the pipe to be welded to rotate around its own axis, and its bottom end is connected to the base through a transverse movement assembly, and the transverse movement assembly can drive the clamping and rotating assembly to move closer to or away from the lifting support plate.

2. The steel structure pipeline butt welding auxiliary device according to claim 1 is characterized in that: The lifting support plate includes a support block 1, a telescopic lifting rod and an arc-shaped pipe support, the top and bottom ends of the telescopic lifting rod are respectively connected to the arc-shaped pipe support and the support block 1, the bottom end of the support block 1 is connected to the base, and the axis of the arc-shaped pipe support is parallel to the axis of the clamping and rotating assembly.

3. The steel structure pipeline butt welding auxiliary device according to claim 1 or 2, characterized in that: A slide groove with an opening at the top is arranged on the base, and the transverse movement assembly includes a bidirectional lead screw and a slider arranged in the slide groove. The bidirectional lead screw is driven to rotate by a first servo motor, and two groups of threads in opposite directions are respectively threadedly connected to two groups of the sliders, and the tops of the two groups of the sliders are respectively connected to different clamping and rotating assemblies.

4. The steel structure pipeline butt welding auxiliary device according to claim 3 is characterized in that: A first transmission groove is configured in the base, and a first transmission shaft and a second transmission shaft are rotatably configured in the first transmission groove, and the two are respectively connected to the bidirectional screw and the first servo motor. A first worm gear is disposed on the outer sleeve of the first transmission shaft, and a first worm is coaxially configured on the second transmission shaft, and the first worm gear is meshed with the first worm gear.

5. The steel structure pipeline butt welding auxiliary device according to any one of claims 1-2 and 4, characterized in that: The clamping and rotating assembly includes a second support block, a hollow sleeve, an arc-shaped clamp and a second servo motor. The bottom end of the second support block is connected to the transverse movement assembly, and the top end is provided with a receiving cavity. The receiving cavity has a first side opening and a second side opening opposite to each other, and the first side opening faces the lifting support plate. The hollow sleeve is horizontally arranged in the accommodating cavity, and its two axial ends correspond to the first side opening and the second side opening respectively; the second servo motor can drive the hollow sleeve to rotate around its own axis; a plurality of arc-shaped hoops are evenly distributed along the circumference of the hollow sleeve, and the plurality of arc-shaped hoops are respectively connected to the hollow sleeve through telescopic clamping rods, and the telescopic clamping rods can drive the arc-shaped hoops to move radially along the hollow sleeve.

6. The steel structure pipeline butt welding auxiliary device according to claim 5 is characterized in that: An adapter ring and a gear ring are sleeved on the outer wall of the hollow sleeve. The adapter ring is rotatably connected to the inner wall of the accommodating cavity. The gear ring is meshedly connected to a transmission gear. The transmission gear is driven to rotate by the second servo motor.

7. The steel structure pipeline butt welding auxiliary device according to claim 6 is characterized in that: The support block 2 is provided with a second transmission groove and a third transmission groove, the second transmission groove is connected to the accommodating chamber for installing the transmission gear; the third transmission groove is connected to the second transmission groove for installing the second servo motor; the transmission gear is connected to the second servo motor through a third transmission shaft and a fourth transmission shaft, a second worm gear is outermostly provided on the third transmission shaft, a second worm is coaxially arranged on the fourth transmission shaft, and the second worm gear is meshed with the second worm.

8. The steel structure pipeline butt welding auxiliary device according to any one of claims 6-7, characterized in that: The arc-shaped clamp is located inside the hollow sleeve; one end of the telescopic clamping rod passes through the side wall of the hollow sleeve and is connected to the inner wall of the adapter ring.

9. A method for using the steel structure pipeline butt welding auxiliary device according to claim 8, characterized in that: Includes steps: Put one end of the pipe to be welded through the hollow casing and put the other end on the lifting support plate; Start the telescopic clamping rod and telescopic lifting rod, and use the arc clamp and arc pipe support to change the height of the axial ends of the pipe to be welded until the axis of the pipe to be welded is horizontal and in line with the axis of the hollow casing; Start the first servo motor, and use the bidirectional lead screw to drive the two sets of slide blocks to move closer to each other until the welding ends of the two pipes to be welded are accurately butted; The second servo motor is started, and the pipe to be welded is driven to rotate by the clamping and rotating assembly to implement the circumferential welding.

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