Pipe joint welding apparatus

Abstract

The application discloses a pipeline joint welding equipment, which comprises a bottom plate, a clamping piece arranged at the top end of the bottom plate, a pipeline to be welded arranged on the clamping piece, a connecting piece arranged in the pipeline to be welded on the clamping piece, and a mechanical arm arranged at the top end of the bottom plate. In the application, the connecting piece can form an integral inside supporting structure with the expansion piece one, the expansion piece two and the connecting rod, the abutting rod is uniformly supported by the driving piece, the internal motor one, the screw rod, the sliding block and the adjusting rod, and the bilateral synchronous alignment is realized by cooperation of the gear transmission, the motor two, the bevel gear one and the bevel gear two drive the sliding assembly to operate, the pipeline butt joint coaxial precision is ensured, the pipeline can be smoothly demoulded after welding, and the internal structure is prevented from being locked and damaging the inner wall of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding equipment technology, specifically a pipeline joint welding equipment. Background Technology

[0002] Pipe joint welding is mainly used to connect two or more sections of metal pipes into a whole through welding process, forming a complete and sealed pipeline system. It is widely used in many fields such as municipal pipelines, chemical transportation, oil and gas transmission, and water conservancy projects. The core is to melt and fuse the end faces of the pipe joints through welding heat, and form a strong connection structure after cooling. This ensures that the pipeline has good sealing performance, pressure resistance and structural stability during fluid transportation. It is a key process to ensure the normal operation of various pipeline systems and an indispensable core link in pipeline installation and construction.

[0003] Most existing pipe joint welding equipment relies solely on external clamping to limit pipe positioning, lacking a reliable internal docking support structure. When two pipe sections are docked, the coaxiality is difficult to control precisely. At the same time, the internal structure of the equipment has poor synchronization and linkage, and the alignment consistency on both sides is insufficient. After welding, it is difficult to demold the internal components, which can easily lead to jamming and slugging. It can also easily cause wear and damage to the inner wall of the pipe. Therefore, it cannot simultaneously meet the comprehensive requirements of high-precision docking and smooth demolding without damage. Summary of the Invention

[0004] The purpose of this invention is to address the problems of existing pipe joint welding equipment, which mostly rely on external clamping to limit pipe positioning, lack reliable internal docking support structures, make it difficult to accurately control the coaxiality when two pipe sections are docked, have poor internal structure synchronization, insufficient alignment consistency on both sides, make it difficult to demold internal components after welding, easily cause jamming, and easily cause wear and damage to the inner wall of the pipe, and cannot simultaneously meet the comprehensive use requirements of high-precision docking and non-destructive and smooth demolding. Therefore, this invention provides a pipe joint welding equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pipe joint welding device, comprising: a base plate, a clamping member provided at the top of the base plate, a pipe to be welded provided on the clamping member, a connecting member provided inside the pipe to be welded on the clamping member, and a robotic arm provided at the top of the base plate; The connector includes an expansion member one and an expansion member two, a connecting rod is fixedly connected between the expansion member one and the expansion member two, and a driving member is provided on the expansion member one and the expansion member two; The first expansion component includes a mounting plate, one end of which is fixedly connected to a guide rod, and the other end of which is fixedly connected to a fixing plate. A screw is threaded through the center of the mounting plate and the fixing plate, and the screw is rotatably connected to the mounting plate and the fixing plate. A sliding block is threadedly connected to the outer surface of the screw, and the guide rod passes through the sliding block, and the sliding block is slidably connected to the guide rod. An abutment rod is rotatably connected to the side end of the mounting plate, and an adjusting rod is rotatably connected to the inner side of the abutment rod. One end of the adjusting rod is rotatably connected to the side end of the sliding block. A sliding assembly is fixedly connected to the side of the abutment rod away from the mounting plate. The abutment rod, adjusting rod, and sliding assembly are arranged in three sets, arranged in a circumferential array around the central axis of the screw. The second expansion component has the same structure and size as the first expansion component and is mirror-distributed on both ends of the connecting rod.

[0006] As a further embodiment of the present invention: two sets of clamping members are provided, symmetrically distributed on the top of the base plate and distributed along the axis of the pipe to be welded; two sets of robotic arms are provided and distributed perpendicular to the axis of the pipe to be welded, and the robotic arms are located at the connection of the two sections of the pipe to be welded; the robotic arms are welding robotic arms, mainly composed of a robotic arm body, joint drive components, welding torch, and control system; the control system drives the joints to move in coordination, drives the welding torch to move precisely, and completes the welding operation on the workpiece to be welded according to a preset trajectory, thereby achieving stable and efficient automated welding.

[0007] As a further embodiment of the present invention: the first expansion member and the second expansion member are arranged in a straight line along the axis of the pipe to be welded, and the connecting rod is provided in three sets, arranged in a circular array around the central axis of the first expansion member and the second expansion member.

[0008] As a further embodiment of the present invention: the guide rods are provided in three sets, arranged in a circular array around the central axis of the mounting plate and the fixing plate.

[0009] As a further embodiment of the present invention: the driving component includes a motor fixedly connected to one side of the mounting plate in expansion component one, the output end of the motor fixedly connected to a screw, and a spur gear one fixedly connected to the outer circular surface of the screw on the side of the mounting plate away from the motor. The outer circular surface of the screw in expansion component two is also provided with a spur gear one. A transmission rod is provided between the mounting plates in expansion component one and expansion component two, and the transmission rod passes through the mounting plates in expansion component one and expansion component two, and is rotatably connected to the two sets of mounting plates. A spur gear two is fixedly connected to the outer circular surface of the transmission rod. There are two sets of spur gear two, symmetrically distributed on the side of the two sets of mounting plates away from the motor, and each set of spur gear two meshes with one set of spur gear one.

[0010] As a further embodiment of the present invention: the sliding assembly includes a mounting bracket fixedly connected to one end of the abutment rod, a rotating shaft is provided through the side end of the mounting bracket, and the rotating shaft is rotatably connected to the abutment rod. A rotating wheel is fixedly connected to the outer surface of the rotating shaft, and the rotating wheel is located inside the mounting bracket. One of the three sets of abutment rods in the expansion member is fixedly connected to the side end of a second motor. A first bevel gear is fixedly connected to the output end of the second motor. A second bevel gear is fixedly connected to one end of the rotating shaft, and the first bevel gear and the second bevel gear are meshed together. The second expansion member is also provided with a second motor, a first bevel gear, and a second bevel gear.

[0011] As a further embodiment of the present invention: the clamping member includes a support plate fixedly connected to the top of the base plate, and two sets of the support plates are provided, symmetrically distributed on both sides of the pipe to be welded. A connecting plate is fixedly connected to the inner side of the support plate. The connecting plate is n-shaped and flush with the top of the support plate. The bottom ends of the two sets of connecting plates are fixedly connected to a lower fixing plate. The lower fixing plate is C-shaped with an upward opening, and an avoidance groove is provided through the inner side of the lower fixing plate.

[0012] As a further embodiment of the present invention: a linear actuator is fixedly connected to the inner side of the support plate, the linear actuator penetrates the inner side of the n-shaped connecting plate, the movable end of the linear actuator is fixedly connected to an upper fixed plate, two sets of linear actuators are provided, symmetrically distributed on two sets of support plates, the movable ends of the two sets of linear actuators are jointly fixedly connected to a lower fixed plate, the lower fixed plate is C-shaped, the opening is downward, and the width of the lower fixed plate is smaller than the clearance groove, the lower fixed plate is located in the clearance groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the connecting parts can form an integral internal support structure with the help of expansion parts one, expansion parts two, and connecting rods. The drive parts rely on motor one, screw, sliding block, and adjusting rod to drive the abutment rod to spread evenly. With the help of gear transmission, the two sides can be synchronously aligned. At the same time, motor two, bevel gear one, and bevel gear two drive the sliding components to operate, which not only ensures the coaxial accuracy of the pipe connection, but also allows for smooth demolding after welding, avoiding the internal structure from jamming and damaging the inner wall of the pipe. 2. In this invention, the clamping component can rely on the support plate and connecting plate to provide a stable support base. The upper and lower fixed plates are driven by a linear actuator to open and close to clamp the pipe. With the clearance groove at the lower fixed plate, the clamping force is balanced and the clamping range is adjustable. The pipe to be welded is firmly fixed from the outside, which can offset the vibration and thermal deformation displacement during the welding process, ensure the weld formation is regular, and improve the stability of the welded structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a partial sectional view of the entire invention; Figure 3 This is a schematic diagram of the connector structure in this invention; Figure 4 This is a schematic diagram of the structure of the expansion member one in this invention; Figure 5 In this invention Figure 4 A schematic diagram of the structure at point B; Figure 6 In this invention Figure 3 A schematic diagram of the structure at point A; Figure 7 This is a schematic diagram of the clamping component in this invention; Figure 8 In this invention Figure 7 A schematic diagram of the structure at point C.

[0015] In the diagram: 1. Base plate; 2. Connector; 21. Expansion part one; 211. Mounting plate; 212. Guide rod; 213. Fixing plate; 214. Screw; 215. Sliding block; 216. Abutment rod; 217. Adjusting rod; 218. Sliding assembly; 22. Expansion part two; 23. Drive component; 231. Motor one; 232. Spur gear one; 233. Transmission rod; 234. Spur gear two; 24. Connecting rod; 25. Motor two; 26. Bevel gear one; 27. Bevel gear two; 3. Clamping component; 31. Support plate; 32. Connecting plate; 33. Lower fixing plate; 34. Clearance groove; 35. Linear actuator; 36. Upper fixing plate; 4. Robotic arm. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0018] Reference Figures 1 to 2 In this embodiment of the invention, a pipe joint welding device includes: a base plate 1, a clamping member 3 is provided at the top of the base plate 1, a pipe to be welded is provided on the clamping member 3, two sets of clamping members 3 are provided, symmetrically distributed at the top of the base plate 1 and distributed along the axis of the pipe to be welded, a connecting member 2 is provided inside the pipe to be welded on the clamping member 3, the connecting member 2 temporarily connects each section of the pipe to be welded on the two sets of clamping members 3, with the end faces aligned and fitted, a robotic arm 4 is provided at the top of the base plate 1, two sets of robotic arms 4 are provided and distributed perpendicular to the axis of the pipe to be welded, and the robotic arm 4 is located at the connection of the two sections of the pipe to be welded, the robotic arm 4 is a welding robotic arm 4, mainly composed of the robotic arm 4 body, joint drive components, welding torch, and control system, the control system drives the joints to move in coordination, drives the welding torch to move precisely, and completes the welding operation on the workpiece to be welded according to the preset trajectory, so as to achieve stable and efficient automated welding.

[0019] Reference Figures 3 to 6The connector 2 includes an expansion member 1 21 and an expansion member 22. The expansion members 1 21 and 22 are arranged in a straight line along the axis of the pipe to be welded. A connecting rod 24 is fixedly connected between the expansion members 1 21 and 22. Three sets of connecting rods 24 are arranged in a circumferential array around the central axis of the expansion members 1 21 and 22. A driving member 23 is provided on the expansion members 1 21 and 22. The expansion member 1 21 includes a mounting plate 211. A guide rod 212 is fixedly connected to one end of the mounting plate 211, and a fixing plate 213 is fixedly connected to one end of the guide rod 212. Three sets of guide rods 212 are arranged in a circumferential array around the central axis of the mounting plate 211 and the fixing plate 213. The mounting plate 211 and the fixing plate 213... A screw 214 is inserted through the center of plate 3, and the screw 214 is rotatably connected to the mounting plate 211 and the fixing plate 213. A sliding block 215 is threadedly connected to the outer surface of the screw 214. A guide rod 212 passes through the sliding block 215, and the sliding block 215 is slidably connected to the guide rod 212. An abutment rod 216 is rotatably connected to the side of the mounting plate 211. An adjusting rod 217 is rotatably connected to the inner side of the abutment rod 216. One end of the adjusting rod 217 is rotatably connected to the side of the sliding block 215. A sliding assembly 218 is fixedly connected to the side of the abutment rod 216 away from the mounting plate 211. Three sets of abutment rods 216, adjusting rods 217, and sliding assemblies 218 are arranged in a circumferential array around the central axis of the screw 214. Expander 22 and expander 213 are also present. 1. The components are identical in structure and size, and mirror-distributed on both sides of the connecting rod 24. The driving component 23 includes a motor 231 fixedly connected to one side of the mounting plate 211 in expansion component 1 21. The output end of motor 231 is fixedly connected to a screw 214. A spur gear 232 is fixedly connected to the outer surface of the screw 214 on the side of the mounting plate 211 away from motor 231. A spur gear 232 is also provided on the outer surface of the screw 214 in expansion component 22. A transmission rod 233 is provided between the mounting plates 211 in expansion component 1 21 and expansion component 22. The transmission rod 233 passes through the mounting plates 211 in expansion component 1 21 and expansion component 22, and is rotatably connected to both sets of mounting plates 211. A spur gear is fixedly connected to the outer surface of the transmission rod 233. Two sets of spur gears 234 are symmetrically distributed on the side of the two mounting plates 211 away from the motor 231. Each set of spur gears 234 meshes with a set of spur gears 232. The sliding assembly 218 includes a mounting bracket fixedly connected to one end of the abutment rod 216. A rotating shaft is provided through the side end of the mounting bracket and is rotatably connected to the abutment rod 216. A rotating wheel is fixedly connected to the outer surface of the rotating shaft and is located inside the mounting bracket. In the expansion member 21, one set of abutment rods 216 is fixedly connected to the side end of one set of abutment rods 216. A bevel gear 26 is fixedly connected to the output end of the motor 25. A bevel gear 27 is fixedly connected to one end of the rotating shaft, and bevel gear 26 and bevel gear 27 mesh with each other.The expansion member 22 is also equipped with a second motor 25, a first bevel gear 26, and a second bevel gear 27.

[0020] The above solution is adopted: the expansion member 1 21, expansion member 22, connecting rod 24 mounted on the connector 2 are linked with the driving member 23, and together with the mounting plate 211, guide rod 212, fixing plate 213, screw 214, sliding block 215, abutment rod 216, and adjusting rod 217, the pipe is evenly expanded and fixed inside. Combined with the motor 1 231 and gear transmission structure, the double-sided expansion structure is synchronously driven. Combined with the sliding component 218 controlled by the motor 2 25, the welding is smoothly demolded after welding, ensuring the docking accuracy.

[0021] Reference Figures 7 to 8 The clamping component 3 includes a support plate 31 fixedly connected to the top of the base plate 1. Two sets of support plates 31 are symmetrically distributed on both sides of the pipe to be welded. A connecting plate 32 is fixedly connected to the inner side of the support plate 31. The connecting plate 32 is n-shaped and flush with the top of the support plate 31. The bottom ends of the two sets of connecting plates 32 are fixedly connected to a lower fixing plate 33. The lower fixing plate 33 is C-shaped with an upward opening. An obstacle groove 34 is provided through the inner side of the lower fixing plate 33. A linear actuator 35 is fixedly connected to the inner side of the support plate 31. The linear actuator 35 passes through the inner side of the n-shaped connecting plate 32. An upper fixing plate 36 is fixedly connected to the movable end of the linear actuator 35. Two sets of linear actuators 35 are symmetrically distributed on the two sets of support plates 31. The movable ends of the two sets of linear actuators 35 are fixedly connected to a lower fixing plate 33. The lower fixing plate 33 is C-shaped with an downward opening. The width of the lower fixing plate 33 is smaller than that of the obstacle groove 34. The lower fixing plate 33 is located within the obstacle groove 34.

[0022] The above solution is adopted: the support plate 31 and the n-shaped connecting plate 32 of the clamping component 3 serve as the overall support structure, and together with the lower fixed plate 33 and the upper fixed plate 36, they form an upper and lower clamping structure. The clamping component is driven to open and close to clamp the pipe by the linear actuator 35. At the same time, the clearance groove 34 provides space for movement, and the clamping force is uniform, which can effectively limit the circumferential displacement of the pipe and prevent deformation and displacement caused by welding heat.

[0023] The working principle of this invention is as follows: When performing pipe joint welding operations, the worker first places the two sections of pipe to be welded at the corresponding positions of the two sets of clamping parts 3 on the top of the base plate 1. Then, the linear actuator 35 inside the clamping part 3 is activated, which drives the upper fixing plate 36 to move downward. The upper fixing plate 36 and the lower fixing plate 33 cooperate with each other to clamp and fix the pipe from the upper and lower sides outside. At the same time, the support plate 31 and the n-shaped connecting plate 32 provide stable support for the overall clamping structure. The clearance groove 34 reserves sufficient space for the relative movement of the upper fixing plate 36, effectively avoiding structural interference and achieving initial limiting and fixing of the two sections of pipe to be welded on the outside, preventing axial movement and radial displacement of the pipe. After the external clamping and fixing is completed, the connecting part 2 is extended as a whole. The expansion joints 21 and 22 are inserted into the two sections of pipe to be welded, respectively, so that the expansion joint 21 and 22 extend into the inner cavity of the two sections of pipe. The three sets of connecting rods 24 maintain the stable distance between the two sides of the structure, ensuring that the two sections of pipe are initially coaxially aligned. Then, the motor 231 in the drive unit 23 is started. The output end of the motor 231 drives the screw 214 inside the expansion joint 21 to rotate. The screw 214 and the sliding block 215 are threadedly driven, so that the sliding block 215 slides axially along the guide rod 212. The sliding block 215 pulls the adjusting rod 217 to rotate, which in turn pushes the three sets of circumferentially distributed abutment rods 216 to expand outwards simultaneously. At the same time, the spur gear 232 on the outside of the screw 214 meshes with the spur gear 234 on the transmission rod 233, and the power is transmitted through the transmission rod 233. The screw 214, synchronously transmitted to the inside of the second expansion member 22, causes the mirror-mounted second expansion member 22 to complete a synchronous expansion action. The rotating wheels on the first expansion member 21 and the second expansion member 22 synchronously press against the inner wall of the corresponding pipe, providing support and locking from the inside of the pipe. This ensures that the end faces of the two pipe sections to be welded fit tightly and are precisely coaxially connected. The dual positioning inside and outside effectively eliminates the connection gap. After the pipe connection and positioning are completed, the two sets of robotic arms 4 symmetrically distributed on the base plate 1 are activated. The internal control system of the robotic arms 4 regulates the coordinated operation of the joint drive components, driving the end welding torch to move smoothly along the weld seam of the two pipe sections according to the preset trajectory, continuously completing the automated welding operation of the pipe joint. After all welding processes are completed, the first motor 231 rotates in reverse, and the screw 214 rotates in reverse. The sliding block 215 is reset, and the adjusting rod 217 pulls the abutment rod 216 inward, releasing the internal support of the connector 2 on the inner wall of the pipe. Then, the motor 25 on the expansion parts 1 and 22 is activated. The motor 25 drives the bevel gear 1 to rotate, and the bevel gear 1 and 27 mesh to drive the rotating shaft and the outer rotating wheel to rotate synchronously. With the help of the rolling of the rotating wheel, the connector 2 is smoothly and smoothly disengaged from the inside of the pipe without scratching the inner wall of the pipe. Finally, the linear actuator 35 retracts and resets in the opposite direction, and the upper fixing plate 36 is lifted upward, releasing the clamping device 3 from the outside of the pipe. The welded pipe workpiece can then be removed. The entire operation process is smooth, with high internal and external positioning accuracy, good welding stability, and convenient demolding.It can be adapted to welding various pipe specifications, effectively improving welding quality and work efficiency. Through connector 2, an integral internal support structure can be formed with the help of expansion member 1 21, expansion member 22, and connecting rod 24. The drive member 23, with motor 1 231, screw 214, sliding block 215, and adjusting rod 217, drives the abutment rod 216 to evenly expand. Combined with gear transmission, synchronous alignment on both sides is achieved. Simultaneously, motor 25, bevel gear 1 26, and bevel gear 27 drive the sliding assembly 218, ensuring coaxial accuracy of pipe connection. It allows for smooth demolding after welding, preventing internal structural jamming and damage to the pipe's inner wall. The clamping component 3, supported by the support plate 31 and connecting plate 32, provides a stable base. A linear actuator 35 drives the upper and lower fixed plates 36 and 33 to open and close, clamping the pipe. The clearance groove 34 on the lower fixed plate 33 provides ample room for movement, ensuring balanced clamping force and an adjustable clamping range. This firmly secures the pipe to be welded from the outside, counteracting vibrations and thermal deformation during welding, ensuring a neat weld formation, and improving the stability of the welded structure.

[0024] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pipe joint welding device, comprising: The base plate (1) is characterized in that a clamping member (3) is provided at the top of the base plate (1), a pipe to be welded is provided on the clamping member (3), a connector (2) is provided inside the pipe to be welded on the clamping member (3), and a robotic arm (4) is provided at the top of the base plate (1). The connector (2) includes an expansion member one (21) and an expansion member two (22), and a connecting rod (24) is fixedly connected between the expansion member one (21) and the expansion member two (22). A driving member (23) is provided on the expansion member one (21) and the expansion member two (22). The expansion member 1 (21) includes a mounting plate (211), one end of which is fixedly connected to a guide rod (212), and the other end of which is fixedly connected to a fixing plate (213). A screw (214) is provided through the center of the mounting plate (211) and the fixing plate (213), and the screw (214) is distributed on the mounting plate (211) and the fixing plate (213) and rotatedly connected. A sliding block (215) is threadedly connected to the outer surface of the screw (214), and the guide rod (212) passes through the sliding block (215), and the sliding block (215) is slidably connected to the guide rod (212). A connecting rod (216) is rotatably connected to the side end of the plate (211). An adjusting rod (217) is rotatably connected to the inner side of the connecting rod (216). One end of the adjusting rod (217) is rotatably connected to the side end of the sliding block (215). A sliding assembly (218) is fixedly connected to the side of the connecting rod (216) away from the mounting plate (211). The connecting rod (216), adjusting rod (217) and sliding assembly (218) are arranged in three groups, arranged in a circumferential array around the central axis of the screw (214). The expansion member two (22) and expansion member one (21) have the same structure and size, and are mirror-distributed on both sides of the connecting rod (24).

2. The pipe joint welding equipment according to claim 1, characterized in that, Two sets of clamping components (3) are symmetrically distributed on the top of the base plate (1) and distributed along the axis of the pipe to be welded. Two sets of robotic arms (4) are distributed perpendicular to the axis of the pipe to be welded. The robotic arms (4) are located at the connection of the two sections of the pipe to be welded. The robotic arms (4) are welding robotic arms (4), mainly composed of the main body of the robotic arm (4), joint drive components, welding torch, and control system. The control system drives the joints to move in coordination, drives the welding torch to move precisely, and completes the welding operation on the workpiece to be welded according to the preset trajectory, so as to achieve stable and efficient automated welding.

3. The pipe joint welding equipment according to claim 2, characterized in that, The expansion member one (21) and expansion member two (22) are arranged in a straight line along the axis of the pipe to be welded. The connecting rod (24) is provided in three sets, arranged in a circular array around the central axis of expansion member one (21) and expansion member two (22).

4. The pipe joint welding equipment according to claim 3, characterized in that, The guide rods (212) are arranged in three groups, which are distributed in a circular array around the central axis of the mounting plate (211) and the fixing plate (213).

5. The pipe joint welding equipment according to claim 4, characterized in that, The driving component (23) includes a motor (231) fixedly connected to one side of the mounting plate (211) in the expansion component one (21). The output end of the motor (231) is fixedly connected to a screw (214). A spur gear (232) is fixedly connected to the outer surface of the screw (214) on the side of the mounting plate (211) away from the motor (231). A spur gear (232) is also fixedly connected to the outer surface of the screw (214) in the expansion component two (22). The driving component (23) in the expansion component one (21) and the expansion component two (22) are fixedly connected to the motor (231) on one side of the mounting plate (211). A transmission rod (233) is provided between the mounting plates (211), and the transmission rod (233) passes through the mounting plates (211) in the expansion member one (21) and the expansion member two (22), and is rotatably connected to the two sets of mounting plates (211). The outer circular surface of the transmission rod (233) is fixedly connected to the spur gear two (234). There are two sets of spur gear two (234), which are symmetrically distributed on the side of the two sets of mounting plates (211) away from the motor one (231), and each set of spur gear two (234) meshes with a set of spur gear one (232).

6. The pipe joint welding equipment according to claim 5, characterized in that, The sliding assembly (218) includes a mounting bracket fixedly connected to one end of the abutment rod (216). A rotating shaft is provided through the side end of the mounting bracket and is rotatably connected to the abutment rod (216). A rotating wheel is fixedly connected to the outer surface of the rotating shaft and is located inside the mounting bracket. One of the three sets of abutment rods (216) in the expansion member (21) is fixedly connected to the side end of a second motor (25). A first bevel gear (26) is fixedly connected to the output end of the second motor (25). A second bevel gear (27) is fixedly connected to one end of the rotating shaft and the first bevel gear (26) and the second bevel gear (27) are meshed together. The second expansion member (22) is also provided with a second motor (25), a first bevel gear (26) and a second bevel gear (27).

7. The pipe joint welding equipment according to claim 6, characterized in that, The clamping member (3) includes a support plate (31) fixedly connected to the top of the base plate (1). Two sets of the support plates (31) are provided and symmetrically distributed on both sides of the pipe to be welded. A connecting plate (32) is fixedly connected to the inner side of the support plate (31). The connecting plate (32) is n-shaped and flush with the top of the support plate (31). The bottom ends of the two sets of connecting plates (32) are fixedly connected to a lower fixing plate (33). The lower fixing plate (33) is C-shaped with the opening facing upward. An avoidance groove (34) is provided through the inner side of the lower fixing plate (33).

8. A pipe joint welding device according to claim 7, characterized in that, A linear actuator (35) is fixedly connected to the inner side of the support plate (31). The linear actuator (35) passes through the inner side of the n-shaped connecting plate (32). The movable end of the linear actuator (35) is fixedly connected to an upper fixed plate (36). There are two sets of linear actuators (35), which are symmetrically distributed on the two sets of support plates (31). The movable ends of the two sets of linear actuators (35) are fixedly connected to a set of lower fixed plates (33). The lower fixed plate (33) is C-shaped with the opening facing downward. The width of the lower fixed plate (33) is smaller than that of the clearance groove (34). The lower fixed plate (33) is located in the clearance groove (34).

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