Rail type welding device

Abstract

The invention belongs to the technical field of pipeline welding, and particularly relates to a rail type welding device which is characterized in that a welding mechanism and a wire feeding mechanism are separately arranged with a connecting main body of a driving mechanism at intervals, and the welding mechanism and the wire feeding mechanism are not directly integrated on the driving mechanism, so that the assembly volume of the welding device can be reduced; meanwhile, the wire feeding mechanism, the driving mechanism and the welding mechanism are sequentially arranged in the circumferential direction of the annular track, the space occupation in the radial direction of the pipeline can be reduced, the structure around the welded junction of the pipeline can be avoided, the welding device can smoothly rotate along the annular track, and the welding mechanism can move to the designated welding position; according to the welding device, the welding mechanism and the wire feeding mechanism are arranged at the first connecting end and the second connecting end of the connecting body correspondingly, gravity loads formed by the welding mechanism and the wire feeding mechanism can be counteracted mutually, the overall weight distribution of the welding device is more uniform, and therefore the risk of shaking caused by unbalanced gravity can be effectively reduced.

Description

Technical Field

[0001] This application belongs to the field of pipeline welding technology, and more specifically, relates to a rail-type welding device. Background Technology

[0002] The rail-mounted welding machine is a device used for butt welding of pipelines. It can rotate along the rail to weld the pipeline structure and can adapt to different pipe diameters. It has irreplaceable application value in fields with strict requirements for the quality of pipeline welds, such as nuclear power, thermal power, and petrochemicals.

[0003] In related technologies, track-mounted welding machines typically include a track and a drive mechanism and welding structure mounted on the track. The welding mechanism is located at one end of the drive mechanism and moves synchronously with the drive mechanism to perform welding operations. In this configuration, the welding mechanism is directly mounted on the drive mechanism, resulting in a large assembly structure. In space-constrained locations, such as near pipe fittings, tees, elbows, or pipe penetrations through walls, the surrounding structure can interfere with the normal welding operation of the welding mechanism. The drive mechanism may not rotate properly, or the welding mechanism may not extend to the designated position for welding, limiting its usability and making it difficult to meet the needs of various application scenarios. Furthermore, the welding mechanism's location at the end of the drive mechanism leads to excessive weight at the end, causing an imbalance in the drive mechanism's gravity. This can result in swaying during movement and welding, affecting the stability and precision of the welding process and hindering the improvement of welding quality. Summary of the Invention

[0004] The purpose of this application is to provide a track-type welding device, which aims to improve the problems of limited application scenarios and low welding accuracy caused by the large integrated volume of the drive mechanism and welding mechanism and gravity imbalance in related technologies.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A rail-type welding apparatus is provided, comprising an annular rail for fitting onto the outside of a pipe to be welded, and a drive mechanism, a welding mechanism, and a wire feeding mechanism movably mounted on the annular rail; wherein... The driving mechanism includes a connecting body that is movably connected to a ring track. The connecting body has a first connecting end and a second connecting end that are circumferentially spaced along the ring track. A welding mechanism is spaced apart from the connecting body and connected to the first connecting end. A wire feeding mechanism is spaced apart from the connecting body and connected to the second connecting end, and is used to feed welding wire to the welding mechanism for welding the pipe. The drive mechanism also includes a first drive member installed on the connecting body. The first drive member is connected between the connecting body and the annular track and is used to drive the connecting body to move the welding mechanism and the wire feeding mechanism around the pipe along the annular track.

[0006] In some embodiments, the first connection end protrudes in a direction away from the connection body; And / or, the second connection end is configured to protrude in a direction away from the connection body.

[0007] In some embodiments, the drive mechanism includes a first connector, one end of which is connected to a first connection end, and a welding mechanism is mounted on the end of the first connector away from the connection body.

[0008] In some embodiments, the drive mechanism further includes a sliding connector, which is slidably mounted on the connecting body in a second direction. The end of the sliding connector extends out of the connecting body and forms a first connecting end, and the first connecting member is connected to the sliding connector. The connecting body is also provided with a second driving member, which is connected to the sliding connecting member to drive the sliding connecting member to reciprocate along the second direction, thereby driving the first connecting member and the welding mechanism to reciprocate along the second direction; The second direction is parallel to the axis of the circular track.

[0009] In some embodiments, the end of the sliding connector is further provided with a support rod, which extends along a second direction. One end of the support rod is fixedly connected to the sliding connector, and the first connector is fixedly connected to the other end of the support rod.

[0010] In some embodiments, the welding mechanism includes a welding torch body, a welding head, and a wire outlet nozzle. The welding torch body is fixedly installed at the end of the first connector away from the connecting body. The welding head protrudes from the welding torch body toward the annular track. The wire outlet nozzle is located beside the welding head and is used to output the welding wire fed by the wire feeding mechanism to the welding position of the welding head.

[0011] In some embodiments, the welding torch body is further provided with a drive motor for arc length tracking control, and the welding head and wire outlet are disposed at the drive end of the drive motor. The drive motor is used to drive the welding head and wire outlet to move radially along the annular track.

[0012] In some embodiments, along the circumference of the annular track, the wire outlet is located on one side of the welding head, and an image acquisition component is provided on the other side of the welding head. The image acquisition component is positioned facing the welding head to acquire image information of the welding position. The image acquisition component is communicatively connected to the first driving component, the second driving component, and the drive motor.

[0013] In some embodiments, the wire feeding mechanism includes a mounting bracket and a wire feeding reel mounted on the mounting bracket. The mounting bracket is connected to a second connecting end and movably connected to an annular track to move circumferentially around the pipe along the annular track. The wire feeding mechanism also includes a third driving member, which is connected to the connecting body or the mounting bracket to move circumferentially around the pipe along the annular track. The third driving member is driven to drive the welding wire wound on the wire feeding reel to deliver the welding wire to the welding mechanism. The third driving member is located circumferentially between the connecting body and the mounting bracket along the annular track.

[0014] In some embodiments, the drive mechanism further includes a second connector connected to the second connector end, a third drive member mounted on the end of the second connector away from the connector body, and a mounting bracket connected to the third drive member via the third connector.

[0015] In some embodiments, one end of the second connector is pivotally connected to the second connection end, and the opposite ends of the third connector are pivotally connected to the third drive member and the mounting bracket, respectively.

[0016] In some embodiments, the outer surface of the third drive member is provided with a first connecting portion and a second connecting portion, one end of the second connecting member is pivotally connected to the second connecting end, the other end of the second connecting member is connected to the first connecting portion, one end of the third connecting member is pivotally connected to the second connecting portion, and the other end of the fourth connecting portion is pivotally connected to the mounting bracket.

[0017] In some embodiments, the mounting bracket is rotatably mounted with a plurality of first rollers, which abut against the two sides of the track surface of the annular track along the axial direction of the annular track. And / or, the mounting bracket is further provided with at least two first limiting members, and at least one first limiting member is provided on each of the opposite sides of the annular track along the axial direction, and the annular track is sandwiched between at least two first limiting members.

[0018] In some embodiments, the annular track includes an annular rack for fitting onto the outside of the pipe, a connecting body is rotatably mounted with a drive gear that meshes with the annular rack, and a first drive member is drivenly connected to the drive gear.

[0019] In some embodiments, the connecting body is also rotatably mounted with a plurality of second rollers, which abut against the track surface of the annular track on opposite sides of the annular rack along the axial direction of the annular track. And / or, the connecting body is also provided with at least two second limiting members, and at least one second limiting member is provided on each of the opposite sides of the annular track along the axial direction, and the annular track is sandwiched between at least two second limiting members.

[0020] In some embodiments, a plurality of protrusions are provided on the inner ring of the annular track along the radial direction. The plurality of protrusions are evenly spaced along the circumference of the annular track. An elastic stop is provided at the end of each protrusion away from the annular track. The elastic stop is used to abut against the outer surface of the pipe.

[0021] The advantages of the track-type welding device provided in this application are as follows: The welding mechanism and wire feeding mechanism are spaced apart from the drive mechanism's connecting body, and are not directly integrated into the drive mechanism, thus significantly reducing the assembly volume of the welding device. Simultaneously, the sequential arrangement of the wire feeding mechanism, drive mechanism, and welding mechanism along the circumference of the ring track further reduces the space occupied along the pipeline's radial direction, effectively avoiding structures around the weld joint of the pipeline to be welded. This allows the drive mechanism to smoothly rotate the welding mechanism and wire feeding mechanism along the ring track, and the welding mechanism to move precisely to the designated welding position without obstruction. Furthermore, the welding mechanism and wire feeding mechanism are respectively located at the first and second connecting ends of the connecting body, respectively. The gravitational loads formed by the welding mechanism and wire feeding mechanism can cancel each other out, resulting in a more uniform overall weight distribution of the welding device. This effectively reduces the risk of shaking during movement and welding due to gravitational imbalance, helping to improve welding accuracy and quality, and meeting the stringent requirements for pipeline weld quality in fields such as nuclear power, thermal power, and petrochemicals. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of the rail-type welding device provided in this application when installed on the pipe to be welded; Figure 2 for Figure 1 A schematic diagram of the track-type welding device is shown. Figure 3 for Figure 1 Another perspective view of the track-type welding device shown; Figure 4 for Figure 1 A schematic diagram of the wire feeding mechanism of the track-type welding device shown; Figure 5 for Figure 1 A schematic diagram of the drive mechanism of the track-type welding device shown. Figure 6 for Figure 5 The diagram shows the internal structure of the connecting body of the drive mechanism.

[0024] The following are the labeling elements in the figure: 10. Circular track; 11. Circular rack; 12. Protrusion; 13. Elastic stop; 20. Drive mechanism; 21. Connecting body; 211. First connecting end; 212. Second connecting end; 213. Drive gear; 214. Second roller; 215. Second limiting member; 22. First driving member; 23. First connecting member; 24. Sliding connecting member; 241. Support rod; 25. Second driving member; 26. Second connecting member; 27. Third connecting member; 30. Welding mechanism; 31. Welding torch body; 311. Drive motor; 32. Welding head; 33. Wire outlet nozzle; 34. Image acquisition component; 40. Wire feeding mechanism; 401. Welding wire; 41. Mounting bracket; 411. First roller; 412. First limiting component; 42. Wire feeding reel; 43. Third driving component; 100. Pipeline. Detailed Implementation

[0025] To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 6 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, "multiple sets" means two or more sets, "multiple pieces" means two or more pieces, and "several" means one or more, unless otherwise explicitly specified.

[0029] The rail-mounted welding machine is a device used for butt welding of pipelines. It can rotate along the rail to weld the pipeline structure and can adapt to different pipe diameters. It has irreplaceable application value in fields with strict requirements for the quality of pipeline welds, such as nuclear power, thermal power, and petrochemicals.

[0030] In related technologies, track-mounted welding machines typically include a track and a drive mechanism and welding structure mounted on the track. The welding mechanism is located at one end of the drive mechanism and moves synchronously with the drive mechanism to perform welding operations. In this configuration, the welding mechanism is directly mounted on the drive mechanism, resulting in a large assembly structure. In space-constrained locations, such as near pipe fittings, tees, elbows, or pipe penetrations through walls, the surrounding structure can interfere with the normal welding operation of the welding mechanism. The drive mechanism may not rotate properly, or the welding mechanism may not extend to the designated position for welding, limiting its usability and making it difficult to meet the needs of various application scenarios. Furthermore, the welding mechanism's location at the end of the drive mechanism leads to excessive weight at the end, causing an imbalance in the drive mechanism's gravity. This can result in swaying during movement and welding, affecting the stability and precision of the welding process and hindering the improvement of welding quality.

[0031] For example, during the welding of a circumferential weld on a pipeline, a track needs to be fixed to the pipeline being welded. The track is typically a ring-shaped rack or guide rail. The drive mechanism is connected and fixed to the track using gears, friction wheels, or magnetic attraction to achieve smooth movement along the ring track. The welding mechanism is mounted on the drive mechanism. Along the axial direction of the ring track, the width of the drive mechanism and the width of the welding mechanism affect the width of the welding device in the axial direction of the pipeline. Along the radial direction of the pipeline, the height of the drive mechanism and the height of the welding mechanism affect the height of the welding device in the radial direction of the pipeline. Common welding devices have an axial width of approximately 400mm-500mm and a radial height of approximately 200mm-300mm. When there are pipe fittings, tees, or elbows near the weld joint of the pipeline being welded, or when the weld joint of the pipeline penetrates a wall and is close to the wall, the free space around the pipeline may not meet the axial and height requirements of the welding device, causing the welding device to be unable to perform the welding operation normally.

[0032] Based on this, embodiments of this application provide a track-type welding device to solve the above-mentioned problems.

[0033] Please refer to the following: Figures 1 to 3The track-type welding device provided in this application includes a ring track 10, a drive mechanism 20, a welding mechanism 30, and a wire feeding mechanism 40. The ring track 10 is used to fit around the pipe 100 to be welded. The drive mechanism 20, welding mechanism 30, and wire feeding mechanism 40 are movably mounted on the ring track 10. The drive mechanism 20 includes a connecting body 21, which is movably connected to the ring track 10. The connecting body 21 has a first connecting end 211 and a second connecting end 212 arranged circumferentially opposite to each other along the ring track 10. The welding mechanism 30 is spaced apart from the connecting body 21 and connected to the first connecting end 211. The wire feeding mechanism 40 is spaced apart from the connecting body 21 and connected to the second connecting end 212, and is used to feed the welding wire 401 to the welding mechanism 30 for welding the pipe 100. The driving mechanism 20 also includes a first driving member 22 installed on the connecting body 21. The first driving member 22 is connected between the connecting body 21 and the annular track 10 and is used to drive the connecting body 21 to drive the welding mechanism 30 and the wire feeding mechanism 40 to move around the pipe 100 along the annular track 10.

[0034] In the embodiments of this application, such as Figures 1 to 3 As shown, the track-type welding device includes a ring track 10, a drive mechanism 20, a welding mechanism 30, and a wire feeding mechanism 40. The ring track 10 is fitted onto the outside of the pipe 100 to be welded, and its inner diameter is adapted to the outer diameter of the pipe 100. Different sizes of ring tracks 10 can be replaced according to the pipe diameter specifications of the pipe 100 to meet the welding needs of pipes 100 of different specifications in fields such as nuclear power, thermal power, and petrochemicals. The drive mechanism 20 is movably mounted on the ring track 10. The welding mechanism 30 and the wire feeding mechanism 40 are respectively connected to the two ends of the drive mechanism 20. The wire feeding mechanism 40 is used to feed the welding wire 401 to the welding end of the welding mechanism 30 for welding, thereby realizing automated welding of the butt weld of the pipe 100. The drive mechanism 20 is used to drive the welding mechanism 30 and the wire feeding mechanism 40 to move circumferentially around the pipe 100 along the ring track 10 to complete the continuous welding operation of the circumferential seam of the pipe 100.

[0035] Among them, such as Figure 2 and Figure 3As shown, the drive mechanism 20 includes a connecting body 21, which has a first connecting end 211 and a second connecting end 212 spaced apart along the circumference of the annular track 10. The welding mechanism 30 is spaced apart from the connecting body 21 and connected to the first connecting end 211, and the wire feeding mechanism 40 is spaced apart from the connecting body 21 and connected to the second connecting end 212. This allows the welding mechanism 30, the drive mechanism 20, and the wire feeding mechanism 40 to be arranged sequentially and spaced apart along the circumference of the pipe 100, thereby reducing the size occupied by the welding device along the radial direction of the pipe 100. The spacing between the welding mechanism 30 and the connecting body 21 means that the welding mechanism 30 is not directly mounted on the connecting body 21, but is only connected to it through the first connecting end 211. With the axial direction of the pipe 100 as the projection direction, the projections of the two components almost do not overlap in space, or only have a very small overlap at the first connecting end 211. Similarly, the spacing between the wire feeding mechanism 40 and the connecting body 21 means that the wire feeding mechanism 40 is not directly mounted on the connecting body 21, but is only connected to it through the second connecting end 212. With the axial direction of the pipe 100 as the projection direction, the projections of the two components almost do not overlap in space, or only have a very small overlap at the second connecting end 212. Furthermore, in specific embodiments, the spacing between the welding mechanism 30 and the connecting body 21, and the spacing between the wire feeding mechanism 40 and the connecting body 21, can be designed and adjusted according to the actual welding space requirements, thereby further improving the adaptability of the welding device in confined spaces.

[0036] In this regard, please combine Figure 3 and Figure 6 The drive mechanism 20 also includes a first drive member 22, which is fixedly installed on the connecting body 21. Its drive end is connected to the annular track 10, enabling it to drive the connecting body 21 to move the welding mechanism 30 and the wire feeding mechanism 40 circumferentially around the pipe 100 along the annular track 10. As an example, the annular track 10 includes an annular rack 11 that surrounds and fits around the outside of the pipe 100. The connecting body 21 is rotatably mounted with a drive gear 213 that meshes with the annular rack 11. The first drive member 22 is driven by the drive gear 213, thereby driving the connecting body 21 to move the welding mechanism 30 and the wire feeding mechanism 40 along the annular track 10. Alternatively, the connecting body 21 may also be equipped with a roller assembly. The rollers of the roller assembly roll in contact with the track surface of the annular track 10. The first drive member 22 is driven by the rollers, thereby driving the rollers to roll along the annular track 10, achieving circumferential movement of the connecting body 21. As an example, the first drive member 22 can be a servo motor or a stepper motor, etc.

[0037] In this embodiment, the welding mechanism 30 is a welding execution mechanism for performing welding operations at the welding position, which typically includes a welding torch, a welding head 32, and a shielding gas supply assembly, etc.; the wire feeding mechanism 40 is a structure for conveying the welding wire 401 to the welding head 32, which typically includes a roller or disc for winding the welding wire 401, a drive for conveying the welding wire 401, and a guide tube for positioning and moving the welding wire 401, etc.

[0038] In this embodiment of the track-type welding apparatus, the welding mechanism 30 and the wire feeding mechanism 40 are respectively spaced apart from the connecting body 21 of the drive mechanism 20. The welding mechanism 30 and the wire feeding mechanism 40 are not directly integrated into the drive mechanism 20, thereby significantly reducing the assembly volume of the welding apparatus. At the same time, the sequential arrangement of the wire feeding mechanism 40, the drive mechanism 20, and the welding mechanism 30 along the circumference of the annular track 10 further reduces the space occupied along the radial direction of the pipe 100, thereby effectively avoiding the structure around the weld joint of the pipe 100 to be welded, so that the drive mechanism 20 can drive the welding mechanism 30 and the wire feeding mechanism 40 along the annular track 10. With smooth rotation, the welding mechanism 30 can move precisely to the designated welding position without obstruction. Furthermore, the welding mechanism 30 and the wire feeding mechanism 40 are respectively located at the first connecting end 211 and the second connecting end 212 of the connecting body 21, which are positioned opposite each other. The gravitational loads formed by the welding mechanism 30 and the wire feeding mechanism 40 can cancel each other out, making the overall weight distribution of the welding device more uniform. This effectively reduces the risk of shaking of the welding mechanism 30 and other components during movement and welding due to gravitational imbalance, which helps to improve the accuracy and quality of welding and meet the stringent requirements for the quality of pipeline welds in fields such as nuclear power, thermal power, and petrochemicals.

[0039] In some embodiments, such as Figures 1 to 3 As shown, the first connecting end 211 protrudes in a direction away from the connecting body 21.

[0040] In this embodiment, the first connecting end 211 protrudes into the external space of the connecting body 21 and extends a certain length along the circumference of the annular track 10, so that the welding mechanism 30 connected to the first connecting end 211 can maintain a certain distance from the connecting body 21, so that the two can be more dispersed in space, thereby further optimizing the layout and reducing space occupation.

[0041] In some embodiments, such as Figures 1 to 3 As shown, the second connecting end 212 protrudes in a direction away from the connecting body 21.

[0042] In this embodiment, the second connecting end 212 protrudes into the external space of the connecting body 21 and extends a certain length along the circumference of the annular track 10, so that the wire feeding mechanism 40 connected to the second connecting end 212 can maintain a certain distance from the connecting body 21, so that the two can be more dispersed in space, thereby further optimizing the layout and reducing space occupation.

[0043] In some embodiments, such as Figure 2 and Figure 3 As shown, the drive mechanism 20 includes a first connector 23, one end of which is connected to a first connection end 211, and a welding mechanism 30 is installed at the end of the first connector 23 away from the connection body 21.

[0044] In this embodiment, the first connecting end 211 is connected to the welding mechanism 30 through the first connecting member 23. The first connecting member 23 extends circumferentially along the annular track 10 and has a certain length dimension. This can further ensure that the welding mechanism 30 and the connecting body 21 maintain a sufficient distance, disperse their spatial layout, and allow them to be distributed circumferentially along the annular track 10. This allows for better avoidance of structures such as pipe seats, tees, elbows, or walls around the pipe to be welded 100.

[0045] In a specific embodiment, the driving mechanism 20 may include a first connector 23 of different lengths or the length of the first connector 23 may be adjustable, such as a telescopic rod. In actual use, by selecting a first connector 23 of different lengths, the distance between the welding mechanism 30 and the connecting body 21 can be flexibly adjusted, so that the welding mechanism 30 can be accurately moved to the weld position of the pipe 100. At the same time, the connecting body 21 and the driving mechanism 20 are kept away from structures around the pipe 100, such as pipe seats, tees, elbows or walls, to further reduce the risk of spatial interference.

[0046] In some embodiments, such as Figure 3 and Figure 6 As shown, the drive mechanism 20 also includes a sliding connector 24, which is slidably mounted on the connecting body 21 along the second direction. The end of the sliding connector 24 extends out of the connecting body 21 and forms a first connecting end 211. The first connector 23 is connected to the sliding connector 24. The connecting body 21 is also provided with a second drive member 25, which is connected to the sliding connector 24 to drive the sliding connector 24 to reciprocate along the second direction, thereby driving the first connector 23 and the welding mechanism 30 to reciprocate along the second direction. The second direction is parallel to the axis of the annular track 10.

[0047] In this embodiment, the connecting body 21 is further provided with a sliding connector 24. The sliding connector 24 can reciprocate linearly along the second direction, i.e., along the axial direction of the annular track 10. The first connector 23 is connected to the sliding connector 24, i.e., the welding mechanism 30 is connected to the sliding connector 24. The movement of the sliding connector 24 can drive the welding mechanism 30 to move, so that the welding mechanism 30 can move along the axial direction of the annular track 10, i.e., the pipe 100, thereby achieving welding with a wider weld bead, optimizing the heat distribution during the welding process, avoiding local overheating, making the weld pool more uniform, reducing welding defects, and improving welding quality. At the same time, when there are structures such as pipe seats or elbows near the weld joint, the welding mechanism 30 can also be driven to avoid them along the axial direction, further improving its flexibility.

[0048] Understandably, the sliding connector 24 is slidably mounted on the connecting body 21. For example, the sliding connector 24 and the connecting body 21 are connected by a sliding groove and a sliding rail, achieving a sliding fit. Alternatively, the sliding connector 24 and the connecting body 21 are slidably connected by a lead screw and nut pair, a linear module, or a cylinder drive. Correspondingly, the second drive component 25 can be an electric push rod, a lead screw motor, or a linear module motor, etc. As an example, the second drive component 25 is a swing motor.

[0049] In some embodiments, such as Figure 3 and Figure 6 As shown, the end of the sliding connector 24 is also provided with a support rod 241. The support rod 241 extends along the second direction. One end of the support rod 241 is fixedly connected to the sliding connector 24, and the first connector 23 is fixedly connected to the other end of the support rod 241.

[0050] In this embodiment, a support rod 241 is provided to connect the sliding connector 24 and the first connector 23. Both ends of the support rod 241 are fixedly connected to the first connector 23 and the sliding connector 24, respectively, meaning the support rod 241 rigidly connects the first connector 23 and the sliding connector 24. During welding, the high temperature of the electric arc generates thermal stress, and the vibration of the welding mechanism 30 is transmitted to each connecting structure. The vibration of each connecting structure can then cause the welding mechanism 30 to become unstable. Therefore, the rigid extension design of the support rod 241 along the second direction can improve the connection stiffness between the sliding connector 24 and the first connector 23, reduce the impact of vibration on the welding mechanism 30 during welding, ensure precise welding of the welding mechanism 30, and also help improve welding quality.

[0051] In addition, the support rod 241 has a certain length along the second direction, i.e., along the axial direction of the pipe 100, so that the first connector 23 and the welding mechanism 30 can extend a certain distance along the axial direction of the pipe 100. By setting the support rod 241, the welding mechanism 30 can be pushed to a position further away from the connecting body 21 along the second direction, which can reduce the risk of spatial interference between the first connector 23 and the welding mechanism 30 and the sliding connector 24 and the connecting body 21, and improve the rationality of the structural layout. In some embodiments, such as Figures 1 to 3 As shown, the welding mechanism 30 includes a welding torch body 31, a welding head 32, and a wire outlet nozzle 33. The welding torch body 31 is fixedly installed on the end of the first connector 23 away from the connecting body 21. The welding head 32 protrudes from the annular track 10 and is disposed on the welding torch body 31. The wire outlet nozzle 33 is disposed on the side of the welding head 32 and is used to output the welding wire 401 conveyed by the wire feeding mechanism 40 to the welding position of the welding head 32.

[0052] In this embodiment, the welding torch body 31 is the core component of the welding mechanism 30 and the main functional component for realizing the welding operation. The welding head 32 is disposed on the welding torch body 31 and protrudes towards the annular track 10, so that the welding head 32 can perform welding operations directly on the weld area of ​​the outer wall of the pipe 100. The welding mechanism 30 also includes a wire feed nozzle 33, which is disposed beside the welding head 32, thereby stably guiding and delivering the welding wire 401 fed by the wire feeding mechanism 40 to the weld joint.

[0053] In a specific embodiment, a protective gas channel can also be integrated into the welding torch body 31, allowing the protective gas to be sprayed out from the periphery of the welding head 32 to form an annular protective gas curtain, which isolates the molten pool from air oxidation and further improves the weld quality.

[0054] In some embodiments, such as Figures 1 to 3 As shown, the welding torch body 31 is also provided with a drive motor 311 for arc length tracking control. The welding head 32 and the wire outlet 33 are located at the drive end of the drive motor 311. The drive motor 311 is used to drive the welding head 32 and the wire outlet 33 to move radially along the annular track 10.

[0055] In this way, the welding head 32 and the wire nozzle 33 can move radially along the annular track 10, i.e., the radial direction of the pipe 100, under the drive of the drive motor 311, thereby automatically adjusting the position of the welding torch, compensating for errors caused by pipe diameter roundness, thermal deformation, etc. during the welding process, and achieving high-quality and high-stability welding.

[0056] In a specific embodiment, the drive motor 311 can be the drive motor 311 used in an all-position automatic welding machine to realize automatic arc length tracking control (Automatic Voltage Control, or AVC for short), i.e., an AVC motor, which serves as the moving drive component for the welding head 32 and the wire nozzle 33, thereby accurately controlling the arc length and ensuring welding quality.

[0057] In some embodiments, such as Figures 1 to 3 As shown, along the circumference of the circular track 10, the wire outlet 33 is located on one side of the welding head 32, and an image acquisition component 34 is provided on the other side of the welding head 32. The image acquisition component 34 is positioned facing the welding head 32 to acquire image information of the welding position. The image acquisition component 34 is communicatively connected to the first drive component 22, the second drive component 25 and the drive motor 311.

[0058] In this embodiment, along the circumference of the annular track 10, i.e. the circumference of the pipe 100, the wire nozzle 33 and the image acquisition component 34 are respectively arranged on opposite sides of the welding head 32. The image acquisition component 34 is arranged facing the welding head 32, which can directly align with the welding position (molten pool, arc area). The probability of the wire nozzle 33, welding wire 401 and other components obstructing the monitoring field of view is reduced. Furthermore, the arrangement along the circumference of the annular track 10 means that the image acquisition component 34 will not occupy the radial and axial space of the pipe 100, and it also helps to avoid other structures around the pipe 100.

[0059] In this embodiment, the image acquisition component 34 is communicatively connected to the first drive component 22 and the second drive component 25 of the drive mechanism 20, as well as the drive motor 311 of the welding torch body 31, so as to transmit the image information of the acquired welding position to each drive component in real time, so that each drive component can adjust its action according to the real-time status of the welding position, and the welding head 32 moves along the pipe 100 to switch different welding positions, thus providing a guarantee for achieving high-quality and high-stability welding.

[0060] In this embodiment, it can be understood that the image acquisition component 34 may be a high-temperature resistant industrial camera equipped with a filter lens (to filter the strong light of the electric arc) to acquire image information such as the shape of the molten pool, the weld formation, and the stability of the electric arc in real time.

[0061] In some embodiments, such as Figures 2 to 4As shown, the wire feeding mechanism 40 includes a mounting bracket 41 and a wire feeding reel 42 mounted on the mounting bracket 41. The mounting bracket 41 is connected to the second connecting end 212 and movably connected to the annular track 10 to move around the pipe 100 along the annular track 10. The wire feeding mechanism 40 also includes a third driving member 43, which is connected to the connecting body 21 or the mounting bracket 41 to move around the pipe 100 along the annular track 10. The third driving member 43 is drivenly connected to the welding wire 401 wound on the wire feeding reel 42 to transport the welding wire 401 to the welding mechanism 30. The third driving member 43 is disposed between the connecting body 21 and the mounting bracket 41 along the annular track 10.

[0062] In this embodiment, the wire feeding mechanism 40 includes a mounting bracket 41 and a wire feeding reel 42 mounted on the mounting bracket 41. The welding wire 401 is wound on the wire feeding reel 42 and connected to the second connecting end 212 between the mounting brackets, so that it moves circumferentially along the annular track 10, i.e., the pipe 100, along with the connecting body 21. The wire feeding mechanism 40 also has a third driving member 43, which is used to transport the welding wire 401 wound on the wire feeding reel 42 to the welding mechanism 30, for example, to the output from the wire outlet 33.

[0063] In this embodiment, the third driving member 43 is disposed between the connecting body 21 and the mounting bracket 41. The placement of the third driving member 43 does not occupy the radial and axial space of the pipe 100, thereby helping to further reduce the space occupied by the wire feeding mechanism 40 and helping to avoid structures around the pipe 100. Furthermore, the first connecting member 23 on the welding mechanism 30 side extends circumferentially relative to one end of the connecting body 21 along the annular track 10, while the third driving member 43, mounting bracket 41, etc. on the wire feeding mechanism 40 side extend circumferentially relative to the other end of the connecting body 21 in the same direction. This makes the components at both ends of the driving mechanism 20 symmetrically arranged along the annular track 10, thereby offsetting the cantilever load at both ends of the connecting body 21, reducing the risk of swaying due to unilateral imbalance when the driving mechanism 20 moves along the annular track 10, and improving the stability of the welding. In addition, the third drive unit 43 is located between the connecting body 21 and the wire feeding tray 42. The third drive unit 43 provides transmission power on the wire feeding path of the welding wire 401, which helps to reduce the power loss of wire feeding and also reduces the risk of bending or jamming of the welding wire 401 during the conveying process.

[0064] In a specific embodiment, the third driving member 43 can be a clamping driving assembly with a driving wheel and a driven wheel, which clamps the welding wire 401 through the driving wheel and the driven wheel to drive the welding wire 401 to the welding mechanism 30 side; or, the third driving member 43 can also be a robotic arm structure with a gripper, which clamps the welding wire 401 through the gripper to provide power to transport it to the welding mechanism 30 side.

[0065] In a specific embodiment, depending on the actual situation, wire feeders 42 of different weights can be selected as counterweights to offset the weight of the welding mechanism 30. For example, wire feeders 42 weighing 1kg to 5kg can be set on the mounting bracket 41.

[0066] In some embodiments, such as Figure 2 and Figure 4 As shown, the drive mechanism 20 also includes a second connector 26 connected to the second connector 212, a third drive member 43 installed at the end of the second connector 26 away from the connecting body 21, and a mounting bracket 41 connected to the third drive member 43 through the third connector 27.

[0067] In this embodiment, the second connecting end 212 is connected to the third driving member 43 through the second connecting member 26, and the third driving member 43 is connected to the mounting bracket 41 through the third connecting member 27. The second connecting member 26 and the third connecting member 27 are respectively arranged to extend circumferentially along the annular track 10 and have a certain length dimension, so that the wire feeding mechanism 40 and the connecting body 21 can maintain a sufficient distance, disperse the spatial layout of the driving mechanism 20 and the wire feeding mechanism 40, so that the two can be distributed circumferentially along the annular track 10, thereby better avoiding structures such as pipe seats, tees, elbows or walls around the pipe to be welded 100.

[0068] In a specific embodiment, the drive mechanism 20 may include a second connector 26 of different lengths or the length of the second connector 26 may be adjustable, such as a telescopic rod. In actual use, by selecting a second connector 26 of different lengths, the distance between the wire feeding mechanism 40 and the connecting body 21 can be flexibly adjusted, so that the wire feeding mechanism 40 can more flexibly avoid structures such as pipe seats, tees, elbows or walls around the pipe 100.

[0069] In a specific embodiment, such as Figure 2 and Figure 4 As shown, the end of the second connector 26 away from the connecting body 21 is provided with a retaining ring. The retaining ring can be adapted to fit into the housing of the third drive member 43, thereby fixing the third drive member 43 and the second connector 26. The drive mechanism 20 includes two second connectors 26 arranged parallel to each other along the axial direction of the annular track 10. The two retaining rings of the two second connectors 26 are respectively sleeved on both ends of the housing of the third drive member 43, thereby improving the connection stability of the third drive member 43.

[0070] In some embodiments, such as Figure 2 As shown, one end of the second connector 26 is pivotally connected to the second connector end 212, and the two opposite ends of the third connector 27 are pivotally connected to the third drive member 43 and the mounting bracket 41, respectively.

[0071] In this embodiment, the second connector 26 is pivotally connected to the second connecting end 212, and the third connector 27 is pivotally connected to the third driving member 43 and the mounting bracket 41. The pivot connection means that the two interconnected structures are connected by a pivot or universal joint parallel to the axis of the annular track 10, so that the two interconnected structures can swing at a small angle relative to the outer surface of the pipe 100 around the corresponding pivot or universal joint fulcrum. Through the angle adaptive capability of the pivot structure, the wire feeding mechanism 40 can automatically adjust its moving posture along the annular track 10 with the driving mechanism 20, so that the wire feeding mechanism 40 can move smoothly and synchronously with the connecting body 21.

[0072] In some embodiments, such as Figures 2 to 4 As shown, a plurality of first rollers 411 are rotatably mounted on the mounting bracket 41, and the plurality of first rollers 411 abut against the two sides of the track surface of the annular track 10 along the axial direction of the annular track 10.

[0073] In this embodiment, the mounting bracket 41 is tumblingly connected to the surface of the annular track 10 via first rollers 411. The first rollers 411 abut against the two sides of the surface of the annular track 10, and multiple first rollers 411 provide multi-point support, enabling the mounting bracket 41 to roll and move more smoothly along the annular track 10.

[0074] In a specific embodiment, the number of first rollers 411 is an even number, such as 2, 4 or 6.

[0075] As an example, the mounting bracket 41 has a rectangular frame structure, and there are four first rollers 411, which are respectively installed at the four corners of the mounting bracket 41.

[0076] In some embodiments, such as Figures 2 to 4 As shown, the mounting bracket 41 is also provided with at least two first limiting members 412. At least one first limiting member 412 is provided on each of the opposite sides of the annular track 10 along the axial direction. The annular track 10 is sandwiched between at least two first limiting members 412.

[0077] In this embodiment, at least one first limiting member 412 is provided on each side of the annular track 10. The annular track 10 is clamped between the first limiting members 412, and the first limiting members 412 limit the mounting bracket 41, enabling it to move stably along the annular track 10 and reducing the risk of the mounting bracket 41 detaching from the annular track 10. The number of first limiting members 412 can be 2, 4, or 6, etc.

[0078] In a specific embodiment, the first limiting member 412 can be a roller that abuts against the annular track 10. When the mounting bracket 41 moves, the first limiting member 412 rolls. Thus, there is rolling friction between the first limiting member 412 and the annular track 10, and the friction force is relatively small, thereby reducing the resistance generated by the setting of the first limiting member 412 on the movement of the mounting bracket 41.

[0079] In some embodiments, such as Figure 1 , Figure 3 and Figure 5 As shown, the annular track 10 includes an annular rack 11 for fitting onto the outside of the pipe 100, and the connecting body 21 is rotatably mounted with a drive gear 213 that meshes with the annular rack 11. The first drive member 22 is drivenly connected to the drive gear 213.

[0080] In this embodiment, the annular track 10 includes an annular rack 11 adapted to the outer diameter of the pipe 100. The connecting body 21 is equipped with a drive gear 213 that meshes with the annular rack 11. The first drive member 22 drives the connecting body 21 to move by rotating the drive gear 213. In this way, the first drive member 22 can be integrated inside the connecting body 21 without occupying additional space, which helps to reduce the overall size of the drive mechanism 20.

[0081] In some embodiments, such as Figure 3 and Figure 5 As shown, the connecting body 21 is also rotatably mounted with a plurality of second rollers 214, which abut against the track surface of the annular track 10 on opposite sides of the annular rack 11 along the axial direction of the annular track 10.

[0082] In this embodiment, the connecting body 21 is tumbling to the surface of the annular track 10 via the second roller 214. The second roller 214 abuts against the two sides of the surface of the annular track 10. Multiple second rollers 214 provide multi-point support, enabling the connecting body 21 to roll and move more smoothly along the annular track 10.

[0083] In a specific embodiment, the number of second rollers 214 is an even number, such as 2, 4 or 6.

[0084] As an example, the connecting body 21 is a rectangular frame structure, and there are four second rollers 214, which are respectively installed at the four corners of the connecting body 21.

[0085] In some embodiments, such as Figure 3 and Figure 5As shown, the connecting body 21 is also provided with at least two second limiting members 215. At least one second limiting member 215 is provided on each of the opposite sides of the annular track 10 along the axial direction. The annular track 10 is sandwiched between at least two second limiting members 215.

[0086] In this embodiment, at least one second limiting member 215 is provided on each side of the annular track 10. The annular track 10 is clamped between the second limiting members 215, and the second limiting members 215 limit the connecting body 21, enabling it to move stably along the annular track 10 and reducing the risk of the connecting body 21 detaching from the annular track 10. The number of second limiting members 215 can be 2, 4, or 6, etc.

[0087] In a specific embodiment, the second limiting member 215 can be a roller that abuts against the annular track 10. When the connecting body 21 moves, the second limiting member 215 rolls. Thus, there is rolling friction between the second limiting member 215 and the annular track 10, and the friction force is relatively small, thereby reducing the resistance generated by the setting of the second limiting member 215 on the movement of the mounting bracket 41.

[0088] In some embodiments, such as Figures 1 to 3 As shown, along the radial direction of the annular track 10, a plurality of protrusions 12 are provided on the inner ring of the annular track 10. The plurality of protrusions 12 are evenly spaced along the circumference of the annular track 10. An elastic stop 13 is provided at the end of each protrusion 12 away from the annular track 10. The elastic stop 13 is used to abut against the outer surface of the pipe 100.

[0089] In this embodiment, the protrusions 12 are radially projected onto the inner ring of the annular track 10, i.e., the protrusions 12 protrude toward the surface of the pipe 100. When the annular track is fitted onto the outer wall of the pipe 100, each protrusion 12 abuts against the outer surface of the pipe 100 from multiple positions on the inner ring of the annular track 10. The multiple protrusions 12 cooperate to clamp the pipe 100, thereby stably and reliably fixing the annular track 10 to the outside of the pipe 100. Each protrusion 12 can not only support the annular track 10, but also improve the adaptability of the annular track 10 to different pipe diameters, so that the annular track 10 can meet the size requirements of different pipe diameters. At the same time, it can also realize the coaxiality calibration of the annular track and the pipe to adapt to a certain range of pipe diameter deviations.

[0090] Furthermore, each protrusion 12 is connected to an elastic stop 13 at the end away from the annular track 10. The elastic stop 13 is installed at the end of each protrusion 12 away from the annular track 10. The elastic stop 13 elastically abuts against the outer surface of the pipe 100, which can reduce the damage to the pipe 100 caused by the relevant components of the annular track 10. At the same time, the elastic stop 13 can also compensate for the radial gap between the annular track 10 and the pipe 100 through its own elastic deformation, so that the annular track 10 can be firmly and stably installed on the outside of the pipe 100, providing conditions for the stable movement of the wire feeding mechanism 40 and the welding structure.

[0091] As an example, the elastic stop 13 can be a wear-resistant rubber stop, a ring track silicone stop, or a polyurethane elastic stop 13, etc.

[0092] Please combine them together Figures 1 to 6 The following describes the specific usage steps of the track-type welding device according to the embodiments of this application, with reference to specific examples.

[0093] 1. Assemble the welding device onto the surface of the pipe 100 to be welded: Select a suitable annular track 10 according to the pipe diameter of the pipe 100 to be welded, fit the annular track 10 onto the outside of the weld joint of the pipe 100 to be welded and fix it; connect the welding mechanism 30 and the wire feeding mechanism 40 to the first connecting end 211 and the second connecting end 212 of the connecting body 21 respectively, adjust the interval between the welding mechanism 30 and the wire feeding mechanism 40, and the position of the welding head 32, so that the welding head 32 is directly facing the weld joint of the pipe 100; lead the welding wire 401 out from the wire feeding reel 42 and feed it into the wire outlet 33 after passing through the third driving component 43; turn on the image acquisition component 34 and connect the power supply of the welding torch body; 2. Perform welding operation: Start the first drive unit 22, which drives the connecting body 21 to move the welding mechanism 30 and the wire feeding mechanism 40 around the pipe 100 along the annular track 10; at the same time, start the third drive unit 43 to feed the welding wire 401 at a uniform speed to the wire outlet 33, start the welding torch body, the welding torch body generates an arc to melt the welding wire 401, and the shielding gas is sprayed from the side of the welding head 32 to protect the molten pool from oxidation. The first drive unit 22 drives the connecting body 21 to move smoothly around the pipe 100 along the annular track 10, forming a uniform weld at the weld joint position of the pipe 100.

[0094] 3. The connecting body 21 drives the welding mechanism 30 to move around the pipe 100 in one circumferential direction to complete the welding of the circumferential seam of the pipe 100. Then, turn off all the electric components and the power supply. The welding operation is over. Then, the welding device can be removed from the pipe 100.

[0095] The track-type welding device of this application embodiment arranges the welding mechanism 30, the drive mechanism 20, and the wire feeding mechanism 40 in a circumferentially dispersed manner along the annular track 10. The overall layout of the welding device is optimized, and the width and radial height of the welding device along the axial direction of the pipe 100 are significantly reduced. The radial height can be reduced to as low as 160 mm, and the axial width can be reduced to 200 mm. This effectively reduces interference between the welding device and the pipe seats, tees, elbows, and walls around the pipe 100, enabling welding operations on the pipe 100 in such confined space scenarios. Furthermore, by treating the welding mechanism 30 and the wire feeding mechanism 40 as independent units separate from the drive mechanism 20, the motion mass required to be borne by the drive mechanism 20 is reduced, which helps maintain the smoothness of its movement. Secondly, the welding mechanism 30, being directly connected to the annular track 100, has greater connection reliability and stability, which can reduce the vibration of the welding structure 30 during welding operations, thus helping to improve welding stability and welding quality.

[0096] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A track-type welding device, characterized in that, It includes an annular track for fitting onto the outside of the pipe to be welded, and a drive mechanism, a welding mechanism, and a wire feeding mechanism movably mounted on the annular track; wherein The driving mechanism includes a connecting body movably connected to the annular track. The connecting body has a first connecting end and a second connecting end spaced apart circumferentially along the annular track. The welding mechanism is spaced apart from the connecting body and connected to the first connecting end. The wire feeding mechanism is spaced apart from the connecting body and connected to the second connecting end and is used to feed welding wire to the welding mechanism for welding the pipe. The driving mechanism further includes a first driving member installed on the connecting body. The first driving member is connected between the connecting body and the annular track and is used to drive the connecting body to move the welding mechanism and the wire feeding mechanism around the pipe along the annular track.

2. The rail-type welding device as described in claim 1, characterized in that, The first connecting end protrudes in a direction away from the connecting body; And / or, the second connection end is provided to protrude in a direction away from the connection body.

3. The rail-type welding device as described in claim 1, characterized in that, The driving mechanism includes a first connector extending circumferentially along the annular track, one end of the first connector along the annular track being connected to a first connecting end, and the welding mechanism being installed at the end of the first connector along the annular track away from the connecting body.

4. The rail-type welding device as described in claim 3, characterized in that, The driving mechanism further includes a sliding connector, which is slidably mounted on the connecting body along a second direction. The end of the sliding connector extends out of the connecting body and forms the first connecting end, and the first connecting member is connected to the sliding connector. The connecting body is further provided with a second driving member, which is connected to the sliding connecting member to drive the sliding connecting member to reciprocate along the second direction, thereby driving the first connecting member and the welding mechanism to reciprocate along the second direction. The second direction is parallel to the axis of the circular track.

5. The rail-type welding device as described in claim 4, characterized in that, The sliding connector is further provided with a support rod at its end. The support rod extends along the second direction. One end of the support rod is fixedly connected to the sliding connector, and the first connector is fixedly connected to the other end of the support rod.

6. The rail-type welding device as described in claim 4, characterized in that, The welding mechanism includes a welding torch body, a welding head, and a wire outlet nozzle. The welding torch body is fixedly installed at the end of the first connector away from the connecting body. The welding head protrudes from the welding torch body toward the annular track. The wire outlet nozzle is located beside the welding head and is used to output the welding wire fed by the wire feeding mechanism to the welding position of the welding head.

7. The rail-type welding device as described in claim 6, characterized in that, The welding torch body is also provided with a drive motor for arc length tracking control. The welding head and the wire outlet are located at the drive end of the drive motor. The drive motor is used to drive the welding head and the wire outlet to move radially along the annular track.

8. The rail-type welding device as described in claim 7, characterized in that, Along the circumference of the annular track, the wire outlet is located on one side of the welding head, and an image acquisition component is provided on the other side of the welding head. The image acquisition component is positioned facing the welding head to acquire image information of the welding position. The image acquisition component is communicatively connected to the first driving component, the second driving component, and the driving motor.

9. The rail-type welding device as described in claim 1, characterized in that, The wire feeding mechanism includes a mounting bracket and a wire feeding reel mounted on the mounting bracket. The mounting bracket is connected to the second connecting end and movably connected to the annular track to move around the circumference of the pipe along the annular track. The wire feeding mechanism further includes a third driving member, which is connected to the connecting body or the mounting bracket to move circumferentially around the pipe along the annular track. The third driving member is driven to connect to the welding wire wound on the wire feeding reel to transport the welding wire to the welding mechanism. The third driving member is circumferentially disposed between the connecting body and the mounting bracket along the annular track.

10. The rail-type welding device as described in claim 9, characterized in that, The drive mechanism further includes a second connector connected to the second connection end, and the third drive component is installed at the end of the second connector away from the connection body. The mounting bracket is connected to the third drive component through the third connector.

11. The rail-type welding apparatus as described in claim 10, characterized in that, One end of the second connector is pivotally connected to the second connection end, and the two opposite ends of the third connector are pivotally connected to the third drive member and the mounting bracket, respectively.

12. The rail-type welding device as described in claim 9, characterized in that, The mounting bracket is rotatably mounted with a plurality of first rollers, and the plurality of first rollers abut against the two sides of the track surface of the annular track along the axial direction of the annular track. And / or, the mounting bracket is further provided with at least two first limiting members, and at least one first limiting member is provided on each of the opposite sides of the annular track along the axial direction, and the annular track is sandwiched between at least two first limiting members.

13. The rail-type welding apparatus according to any one of claims 1 to 12, characterized in that, The annular track includes an annular rack for fitting onto the outside of the pipe, and the connecting body is rotatably mounted with a drive gear that meshes with the annular rack. The first driving member is drivenly connected to the drive gear.

14. The rail-type welding apparatus as described in claim 13, characterized in that, The connecting body is also rotatably mounted with a plurality of second rollers, which respectively abut against the track surface of the annular track on opposite sides of the annular rack along the axial direction of the annular track; And / or, the connecting body is further provided with at least two second limiting members, and at least one second limiting member is provided on each of the opposite sides of the annular track along the axial direction, and the annular track is sandwiched between at least two second limiting members.

15. The rail-type welding apparatus according to any one of claims 1 to 12, characterized in that, Along the radial direction of the annular track, a plurality of protrusions are provided on the inner ring of the annular track. The plurality of protrusions are evenly spaced along the circumference of the annular track. An elastic stop is provided at the end of each protrusion away from the annular track. The elastic stop is used to abut against the outer surface of the pipe.

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