A butt joint device for pipe welding

Abstract

The application discloses a butt joint device for pipeline welding and belongs to the technical field of pipeline welding, which comprises a holding mechanism and a butt joint mechanism. The holding mechanism comprises two holding arc plates which are hingedly connected, and arc-shaped insertion grooves are formed in the holding arc plates. The butt joint mechanism comprises two butt joint outer plates which are hingedly connected, and a butt joint inner plate which is movably inserted into the butt joint outer plates and is slidably matched with the arc-shaped insertion grooves. Welding ports are formed in the butt joint outer plates in a penetrating manner. In the scheme, the holding mechanism and the butt joint mechanism are connected, so that the pipelines on both sides can be centrally positioned, the operation of assisting in the central positioning of the pipelines by additional workers is avoided, the central positioning error can be greatly reduced, the conditions such as incomplete welding and large butt joint ports in the pipeline welding are prevented, and the welding quality is improved. One person can operate the butt joint device, the labor cost and a large amount of time are saved, the construction efficiency is remarkably improved, the construction period is reduced, and the butt joint device has great popularization and application values.

Description

Technical Field

[0001] This invention belongs to the field of pipeline welding technology, and more specifically, relates to a butt welding device for pipeline welding. Background Technology

[0002] Pipelines have a wide range of applications, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering, and various industrial installations. In wastewater treatment plant renovation and expansion projects, multiple process pipelines are involved, all made of steel pipes. These pipes typically need to be connected by welding. Currently, an electric hoist is used to move and align the ends of the two pipes to be welded, then workers assist in aligning the connection points, and finally, another worker welds the joint.

[0003] However, during the current welding process, the workers' assistance in aligning the pipes is not stable enough, which easily leads to alignment errors. This results in problems such as incomplete welding and large butt welds, which in turn leads to poor pipe welding quality. Furthermore, welding requires multiple operators, resulting in high construction costs and a significant amount of time, leading to low construction efficiency and impacting the construction schedule.

[0004] Therefore, it is necessary to provide a butt welding device for pipes to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a butt welding device for pipes to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pipe welding butt welding device, comprising:

[0008] There are two clamping mechanisms, which are fixed at the welding positions of the two pipes respectively;

[0009] The docking mechanism is connected to the two clamping mechanisms on its two sides respectively;

[0010] The clamping mechanism includes two clamping arc plates that are hinged together, and the clamping arc plates are provided with arc-shaped slots;

[0011] The docking mechanism includes two hinged outer docking plates, and an inner docking plate that is movably inserted into the outer docking plates and slidably adapted to the arc-shaped slot.

[0012] The clamping arc plate is provided with a plurality of limiting mechanisms for fixing the docking inner plate, and the docking inner plate is provided with a triggering mechanism for releasing the limiting mechanisms from fixing it.

[0013] The outer mating plate has welding joints extending through its top and bottom.

[0014] As a further aspect of the present invention: the inner docking plate is provided with a plurality of limiting holes, and the limiting mechanism includes:

[0015] An embedded groove is formed on the inner wall of an arc-shaped slot. A limiting block adapted to the limiting hole is slidably connected to the inner wall of the embedded groove. One end of the limiting block facing the opening of the arc-shaped slot is a bevel.

[0016] A first elastic element is disposed between the limiting block and the inner wall of the embedded groove. One end of the limiting block is provided with a pull rod, and the other end of the pull rod movably passes through the outer wall of the clamping arc plate.

[0017] As a further aspect of the present invention: the inner docking plate is provided with a sliding groove communicating with the limiting hole, and the limiting holes are interconnected; the triggering mechanism includes:

[0018] A gripping plate is slidably disposed in the groove, and a moving plate adapted to the limiting hole is provided on the gripping plate, and an extrusion block is movably disposed through the moving plate;

[0019] A pressing component is provided on the gripping plate and the moving plate to drive the extrusion block to move.

[0020] As a further aspect of the present invention: the pressing component includes:

[0021] The pressing strip is movably inserted into the grip plate;

[0022] A linkage cavity is formed within the moving plate. A connecting plate, which is slidably disposed within the linkage cavity and connected to the pressing strip and the extrusion block, is provided between the connecting plate and the inner wall of the linkage cavity.

[0023] As a further aspect of the present invention: the inner wall of the groove is provided with a third elastic element, and the other end of the third elastic element is connected to the gripping plate.

[0024] As a further aspect of the present invention: the inner arc groove is provided inside the docking outer plate to slide and adapt to the docking inner plate, and the outer wall of the docking outer plate is provided with a slide rail adapted to the gripping plate, and the slide rail communicates with the inner arc groove.

[0025] As a further aspect of the present invention: the clamping arc plate is provided with multiple pressing mechanisms for supporting and resisting small-diameter pipes.

[0026] As a further aspect of the present invention: the pressing mechanism includes:

[0027] A hidden groove is formed on the inner side wall of the clamping arc plate. A pressure plate is slidably provided on the inner wall of the hidden groove. An outer sleeve is provided at one end of the pressure plate. A screw is threadedly connected inside the outer sleeve. The screw is rotatably connected to the outer wall of the clamping arc plate through a bearing.

[0028] A limiting component is used to restrict the rotation of the outer sleeve.

[0029] As a further aspect of the present invention: the limiting component includes a limiting groove formed inside the clamping arc plate, a limiting slider is slidably provided on the inner wall of the limiting groove, and the outer end of the limiting slider is connected to the outer sleeve.

[0030] As a further embodiment of the present invention: one end of the two mating outer plates is hinged to each other, and the other end is provided with a fixing plate, wherein the fixing plate is provided with a fixing hole.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. This solution connects the clamping mechanism and the docking mechanism, enabling the pipes on both sides to achieve centering and positioning, allowing for stable welding. This eliminates the need for additional personnel to assist in pipe alignment, significantly reducing alignment errors and preventing issues such as incomplete welds and large butt welds, thereby improving welding quality. Furthermore, it can be operated by a single person, saving labor costs and eliminating the need for repeated manual pipe alignment adjustments. This saves considerable time, significantly improves construction efficiency, and shortens the construction period, making it highly valuable for promotion and application.

[0033] 2. In this solution, after welding is completed at the pipe joint, the limiting mechanism releases the fixing of the inner plate, allowing it to rotate around the arc-shaped slot. When the weld joint is rotated to a previously obscured position, another limiting mechanism fixes the inner plate in place. Welding can then proceed at the pipe joint. This allows for a complete and thorough weld at the pipe joint, significantly improving the welding quality, subsequent performance, and lifespan of the pipe.

[0034] 3. In this solution, squeezing the pressing component causes the holding plate to move together with the moving plate. The moving plate then squeezes the limiting block in the corresponding limiting hole. Releasing the pressing component causes the extruded block to disengage from the limiting hole. Through the cooperation of the pressing component and the holding plate, not only can the inner docking plate be moved back and forth, but the fixing mechanism of the inner docking plate can also be released. The structure is ingenious, requiring no complex structure, and is highly practical.

[0035] 4. In this solution, when welding to a pipe with a smaller diameter than the matching pipe, the clamping arc plate can be placed on the outer wall of the pipe and then pressed against the outer wall of the smaller diameter pipe by the holding mechanism. This allows the clamping arc plate to be fixed to the outer wall of the pipe. This device can be adapted to the docking and positioning of smaller diameter pipes, thus adapting to more diameter pipes and providing high flexibility. Attached Figure Description

[0036] Figure 1 This is a structural schematic diagram of the clamping mechanism and docking mechanism of the present invention in use;

[0037] Figure 2 for Figure 1 Other side view structural diagrams;

[0038] Figure 3 This is a schematic diagram of the structure of the clamping mechanism and docking mechanism of the present invention before they are connected;

[0039] Figure 4 This is a schematic diagram of the clamping mechanism of the present invention;

[0040] Figure 5 This is a schematic diagram of the docking mechanism of the present invention;

[0041] Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle;

[0042] Figure 7 This is a schematic diagram of the limiting mechanism structure of the clamping arc plate of the present invention, shown in a partial side section.

[0043] Figure 8 This is a schematic diagram of the triggering mechanism structure under a partial side section of the inner plate of the present invention;

[0044] Figure 9 This is a schematic diagram of the morphological structure of the docking mechanism of the present invention before connection;

[0045] Figure 10 for Figure 9 Enlarged structural diagram at point B;

[0046] Figure 11 This is a schematic diagram of the internal cross-section of the clamping arc plate of the present invention.

[0047] Figure 12 for Figure 11 Enlarged structural diagram at point C.

[0048] Explanation of the labels in the diagram:

[0049] 1. Clamping mechanism; 11. Clamping arc plate; 12. Arc-shaped slot; 13. Limiting mechanism; 131. Embedded groove; 132. Limiting block; 133. First elastic element; 134. Pull rod; 2. Docking mechanism; 21. Docking outer plate; 22. Docking inner plate; 23. Triggering mechanism; 231. Holding plate; 232. Moving plate; 233. Extrusion block; 234. Pressing component; 2341. Pressing strip; 2342. Linkage cavity; 2343. Connecting plate; 2344. Second elastic element; 3. Limiting hole; 4. Slide groove; 5. Third elastic element; 6. Inner arc groove; 7. Slide rail; 8. Holding mechanism; 81. Hidden groove; 82. Holding plate; 83. Outer sleeve; 84. Screw; 85. Limiting component; 851. Limiting groove; 852. Limiting slider; 9. Fixing plate; 10. Handle. Detailed Implementation

[0050] 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.

[0051] Please see Figure 1-6 and Figure 9 A pipe welding butt welding device includes: two clamping mechanisms 1, each fixed at the welding position of two pipes; a butt welding mechanism 2, connected to the two clamping mechanisms 1 on both sides; the clamping mechanism 1 includes two hinged clamping arc plates 11, each with an arc-shaped slot 12; the butt welding mechanism 2 includes two hinged butt welding outer plates 21, each with a butt welding inner plate 22 movably inserted within the outer plate 21 and slidingly adapted to the arc-shaped slot 12; the clamping arc plates 11 have multiple limiting mechanisms 13 for fixing the butt welding inner plate 22, and the butt welding inner plate 22 has a triggering mechanism 23 for releasing the limiting mechanisms 13; the butt welding outer plates 21 have welding ports 24 extending through them vertically. One end of each of the two butt welding outer plates 21 is hinged to each other, and the other end is provided with a fixing plate 9, which has a fixing hole. A handle 10 is provided on the outer wall of each butt welding outer plate 21.

[0052] In use, after the steel pipes are laid, the welding positions are excavated to ensure a working surface for the workers. An excavator or crane is used to lift and initially align the weld joints of the two pipes. Then, the device is installed on the pipes on both sides. First, the two clamping mechanisms 1 are installed and fixed at the welding positions of the two pipes respectively. Specifically, the two clamping arc plates 11 of the clamping mechanism 1 can be rotated and opened along the junction, and then the clamping arc plates 11 are placed on the pipes. After that, the two clamping arc plates 11 are closed, and then the bolts are passed through the fixing holes on the two fixing plates 9 and tightened with nuts to fix the two clamping arc plates 11 to the outer wall of the pipes.

[0053] Next, the docking mechanism 2 is fitted onto the outer wall of the pipe and positioned between the two clamping arc plates 11. The docking mechanism 2 is connected to the two clamping arc plates 11. Specifically, the two outer docking plates 21 are first rotated open, and then the inner docking plate 22 is moved toward the inside of the outer docking plate 21, thus shortening the outward extension length of the inner docking plate 22. Then, the outer docking plate 21 and the inner docking plate 22 are fitted onto the outer wall of the pipe and closed, as shown in the image. Figure 9 The state shown is such that the inner mating plate 22 corresponds to the arc-shaped slot 12 of the clamping arc plate 11. Then, the inner mating plate 22 is moved away from the outer mating plate 21, eventually entering the arc-shaped slot 12. The inner mating plate 22 can rotate around the circumference of the arc-shaped slot 12, adjusting its position so that the welding joint 24 is positioned at the pipe interface. After entering the designated position, the inner mating plate 22 is fixed by the limiting mechanism 13, thus both the outer mating plate 21 and the inner mating plate 22 are now fixed. That is, the outer mating plate 21 and the inner mating plate 22 connect the clamping arc plates 11 on both sides into a single unit, achieving the centering and positioning effect for the pipes on both sides. Then, welding can be performed at the connection point of the pipes on both sides through the welding joint 24 of the outer mating plate 21. At this point, since the pipes on both sides have been aligned and positioned by the clamping mechanism 1 and the docking mechanism 2, welding can be carried out stably. This avoids the need for additional personnel to assist in aligning the pipes, greatly reducing alignment errors and preventing issues such as incomplete welds and large weld joints, thus improving welding quality. Furthermore, one worker can align and fix the pipes on both sides before welding, eliminating the need for additional manual operations. This not only saves labor costs but also avoids the need for repeated adjustments to the pipes for alignment, saving significant time, greatly improving construction efficiency, and shortening the construction period. It has immense value for widespread application and promotion.

[0054] After welding is completed at the pipe joint 24, the trigger mechanism 23 releases the restraining mechanism 13 from fixing the inner plate 22. The inner plate 22 can then rotate around the arc-shaped slot 12, causing the outer plate 21 and the weld joint 24 to rotate together. When the weld joint 24 rotates to a previously obscured position, the inner plate 22 is then fixed by another restraining mechanism 13 on the clamping arc plate 11. Similarly, welding can be performed at the pipe joint 24. This allows for a complete and efficient weld at the pipe joint, resulting in a superior weld and avoiding the instability and errors that occur during manual pipe alignment. This significantly improves the weld quality, subsequent performance, and lifespan of the pipe.

[0055] When disassembling after welding, simply release the fixing of the limiting mechanism 13 to the inner plate 22 by triggering the mechanism 23. Then, you can choose to first pull out the inner plate 22 from the arc slot 12 and then rotate it open, or release the fixing of the clamping arc plate 11 to the pipe and then rotate it open as a whole. Then you can move it to the next pipe connection for construction. It can be reused, has high use value, and can be widely promoted.

[0056] In this embodiment, preferably, please refer to [reference needed]. Figure 1-7 The inner plate 22 is provided with multiple limiting holes 3. The limiting mechanism 13 includes: an inner groove 131, which is opened on the inner wall of the arc-shaped slot 12. A limiting block 132 adapted to the limiting hole 3 is slidably connected to the inner wall of the inner groove 131. One end of the limiting block 132 facing the opening of the arc-shaped slot 12 is a slope. A first elastic member 133 is disposed between the limiting block 132 and the inner wall of the inner groove 131. The first elastic member 133 in this application is a spring. One end of the limiting block 132 is provided with a pull rod 134. The other end of the pull rod 134 moves through the outer wall of the arc plate 11. After the inner mating plate 22 is inserted into the arc-shaped slot 12, the inner mating plate 22 will gradually contact the limiting block 132 and press it. The limiting block 132 will eventually enter the inner groove 131. The first elastic element 133 is compressed, and the inner mating plate 22 continues to move towards the inside of the arc-shaped slot 12. The inner mating plate 22 can be rotated in a circular motion so that the limiting hole 3 and the limiting block 132 are not at the same horizontal position. After the inner mating plate 22 is adjusted and the welding joint 24 is in the pipe interface position, the inner mating plate 22 is rotated in a circular motion so that the limiting hole 3 and the limiting block 132 are in the corresponding position. The rebound force of the first elastic element 133 will drive the limiting block 132 to move. The limiting block 132 will move out of the inner groove 131 and finally enter the corresponding limiting hole 3. At this time, the inner mating plate 22 and the outer mating plate 21 can be fixed by the limiting block 132, which can improve the welding effect of the pipe interface at the welding joint 24.

[0057] In this embodiment, preferably, please refer to [reference needed]. Figure 1-3 and Figure 5-10 The inner plate 22 is provided with a groove 4 that communicates with the limiting hole 3. The limiting holes 3 are interconnected. The triggering mechanism 23 includes: a gripping plate 231, which is slidably disposed in the groove 4. The gripping plate 231 is provided with a moving plate 232 that is adapted to the limiting hole 3. An extrusion block 233 is movably disposed through the moving plate 232. A pressing component 234 is disposed on the gripping plate 231 and the moving plate 232 and is used to drive the extrusion block 233 to move. By squeezing the pressing component 234, the extrusion block 233 can be moved into the transfer plate 232. At this time, pushing the holding plate 231 will cause the transfer plate 232 to move together. The transfer plate 232 will gradually insert into each limiting hole 3. When the transfer plate 232 moves into the limiting hole 3 where the corresponding limiting block 132 is located, the transfer plate 232 will squeeze the limiting block 132 to move a certain distance outward from the limiting hole 3. Then, the pressing component 234 is released. At this time, the extrusion block 233 will move outward from the transfer plate 232. The extrusion block 233 will squeeze the limiting block 132 again, and finally the limiting block 132 will enter the inner groove 131. At this time, the limiting block 132 no longer has a fixing effect on the docking inner plate 22. At this time, the docking inner plate 22 can be rotated along the arc-shaped slot 12 or pulled out from it. By combining the pressing component 234 and the holding plate 231, not only can the docking inner plate 22 be moved back and forth, but the fixing of the docking inner plate 22 by the limiting mechanism 13 can also be released. The structure is ingenious and can be achieved without a very complicated structure. It is highly practical and has a good effect.

[0058] In this embodiment, preferably, please refer to [reference needed]. Figure 6 , Figure 8 and Figure 10 The pressing component 234 includes: a pressing strip 2341, movably inserted into the gripping plate 231; and a linkage cavity 2342, opened within the moving plate 232. A connecting plate 2343, connected to the pressing strip 2341 and the extrusion block 233, is slidably disposed within the linkage cavity 2342. A second elastic element 2344 is provided between the connecting plate 2343 and the inner wall of the linkage cavity 2342. In this application, the second elastic element 2344 is a spring, and its elastic force is greater than that of the first elastic element 133. When the pressing strip 2341 is pressed, the pressing strip 2341 moves the connecting plate 2343, which in turn moves the extrusion block 233 into the linkage cavity 2342. At this time, the second elastic element 2344 is compressed. When the pressing bar 2341 is released, the rebound force of the second elastic element 2344 will drive the connecting plate 2343 and the extrusion block 233 to move, and the extrusion block 233 will move out of the linkage cavity 2342.

[0059] In this embodiment, preferably, please refer to [reference needed]. Figure 5-6 and Figure 9-10The inner wall of the slide 4 is provided with a third elastic element 5, the other end of which is connected to the gripping plate 231. In this application, the third elastic element 5 is a spring. In the initial state, the extruded block 233 is located in the slide 4, and the third elastic element 5 is also in a natural state. When the gripping plate 231 is pushed to move the inner plate 22 in and out of the arc-shaped slot 12 or rotate it along the arc-shaped slot 12, the third elastic element 5 is not pressed, and the moving plate 232 does not move. However, when the pressing component 234 is operated to make the extruded block 233 enter the moving plate 232, and then the moving plate 232 is moved into the corresponding limiting hole 3, the third elastic element 5 is in a compressed state, which can improve the stability and smoothness of the movement of the moving plate 232 and the gripping plate 231, and at the same time, it can quickly and stably return the moving plate 232 and the gripping plate 231 to the initial position.

[0060] In this embodiment, preferably, please refer to [reference needed]. Figure 5-6 and Figure 10 The outer plate 21 has an inner arc groove 6 that slides and adapts to the inner plate 22. The outer wall of the outer plate 21 has a slide rail 7 that adapts to the gripping plate 231, and the slide rail 7 communicates with the inner arc groove 6. The inner arc groove 6 is used for the inner plate 22 to move back and forth, and the slide rail 7 on the outer plate 21 is used to provide space for the gripping plate 231 to move. Moreover, the slide rail 7 slides and fits against the side walls of the gripping plate 231, which can also improve the movement stability of the gripping plate 231.

[0061] In this embodiment, preferably, please refer to [reference needed]. Figure 1-4 and Figure 11-12 The clamping arc plate 11 is provided with multiple pressing mechanisms 8 for supporting small-diameter pipes. The pressing mechanism 8 includes: a recessed groove 81, which is opened in the inner side wall of the clamping arc plate 11; a pressing plate 82 is slidably provided on the inner wall of the recessed groove 81; an outer sleeve 83 is provided at one end of the pressing plate 82; a screw 84 is threadedly connected inside the outer sleeve 83; and the screw 84 is rotatably connected to the outer wall of the clamping arc plate 11 through a bearing; and a limiting component 85, which is used to limit the rotation of the outer sleeve 83.

[0062] When welding to a smaller diameter pipe than the matching pipe, the clamping arc plate 11 can be fitted onto the outer wall of the pipe, and then the screw 84 can be rotated. Due to the rotation restriction of the outer sleeve 83 by the limiting component 85, the screw 84 will drive the outer sleeve 83 connected to it to move. At this time, the outer sleeve 83 will drive the pressure plate 82 to move, and the pressure plate 82 will move out of the hidden groove 81. After moving multiple pressure plates 82, the pressure plate 82 will press against the outer wall of the small diameter pipe. Then, through the cooperation of bolts and the fixing plate 9 of the clamping arc plate 11, the clamping arc plate 11 can be fixed to the outer wall of the pipe. The subsequent steps are the same as above. Thus, this device can be adapted to the docking and positioning of smaller diameter pipes, and can adapt to more diameter pipes. It is highly flexible and has a wide range of applications.

[0063] In this embodiment, preferably, please refer to [reference needed]. Figure 12 The limiting component 85 includes a limiting groove 851 formed inside the clamping arc plate 11, and a limiting slider 852 slidably disposed on the inner wall of the limiting groove 851. The outer end of the limiting slider 852 is connected to the outer sleeve 83. When the outer sleeve 83 moves, it will drive the limiting slider 852 to move along the limiting groove 851, thereby preventing the rotation of the outer sleeve 83 and improving its movement stability.

[0064] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

[0065] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0066] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A butt welding device for pipe welding, characterized in that, include: The clamping mechanism (1) has two parts, which are fixed at the welding positions of the two pipes respectively; The docking mechanism (2) is connected to the two clamping mechanisms (1) on both sides respectively; The clamping mechanism (1) includes two clamping arc plates (11) that are hinged together, and an arc-shaped slot (12) is provided on the clamping arc plate (11). The docking mechanism (2) includes two hinged docking outer plates (21), and a docking inner plate (22) that is movably inserted in the docking outer plate (21) and slidably adapted to the arc-shaped slot (12). The clamping arc plate (11) is provided with a plurality of limiting mechanisms (13) for fixing the docking inner plate (22), and the docking inner plate (22) is provided with a triggering mechanism (23) for releasing the limiting mechanism (13) from fixing it. The outer plate (21) is provided with welding joints (24) running through its top and bottom. The inner docking plate (22) has multiple limiting holes (3), and the limiting mechanism (13) includes: An embedded groove (131) is formed on the inner wall of the arc-shaped slot (12). The inner wall of the embedded groove (131) is slidably connected to a limiting block (132) that is adapted to the limiting hole (3). The end of the limiting block (132) facing the opening of the arc-shaped slot (12) is a bevel. The first elastic element (133) is disposed between the inner wall of the limiting block (132) and the inner groove (131). One end of the limiting block (132) is provided with a pull rod (134), and the other end of the pull rod (134) movably passes through the outer wall of the clamping arc plate (11). The inner docking plate (22) is provided with a groove (4) communicating with the limiting hole (3), and the limiting holes (3) are interconnected. The triggering mechanism (23) includes: The gripping plate (231) is slidably disposed in the groove (4). The gripping plate (231) is provided with a moving plate (232) that is adapted to the limiting hole (3). An extrusion block (233) is movably disposed through the moving plate (232). The pressing component (234) is provided on the holding plate (231) and the moving plate (232) for driving the extrusion block (233) to move; The pressing component (234) includes: The pressing strip (2341) is movably inserted into the grip plate (231); A linkage cavity (2342) is opened inside the moving plate (232). A connecting plate (2343) connected to the pressing strip (2341) and the extrusion block (233) is slidably provided inside the linkage cavity (2342). A second elastic element (2344) is provided between the connecting plate (2343) and the inner wall of the linkage cavity (2342).

2. The pipe welding butt welding device according to claim 1, characterized in that, The inner wall of the groove (4) is provided with a third elastic element (5), and the other end of the third elastic element (5) is connected to the grip plate (231).

3. The pipe welding butt welding device according to claim 1, characterized in that, The inner arc groove (6) of the outer docking plate (21) is provided inside to slide and adapt to the inner docking plate (22). The outer wall of the outer docking plate (21) is provided with a slide (7) that is adapted to the gripping plate (231), and the slide (7) communicates with the inner arc groove (6).

4. The pipe welding butt welding device according to claim 1, characterized in that, The clamping arc plate (11) is provided with multiple pressing mechanisms (8) for pressing and supporting small-diameter pipes.

5. A pipe welding butt welding device according to claim 4, characterized in that, The pressing mechanism (8) includes: A hidden groove (81) is formed on the inner side wall of the clamping arc plate (11). A pressure plate (82) is slidably provided on the inner wall of the hidden groove (81). An outer sleeve (83) is provided at one end of the pressure plate (82). A screw (84) is threadedly connected inside the outer sleeve (83). The screw (84) is rotatably connected to the outer wall of the clamping arc plate (11) through a bearing. A limiting component (85) is used to limit the rotation of the outer sleeve (83).

6. A pipe welding butt welding device according to claim 5, characterized in that, The limiting component (85) includes a limiting groove (851) opened inside the clamping arc plate (11), and a limiting slider (852) is slidably provided on the inner wall of the limiting groove (851). The outer end of the limiting slider (852) is connected to the outer sleeve (83).

7. A pipe welding butt welding device according to claim 1, characterized in that, The two outer plates (21) are hinged to each other at one end, and each end is provided with a fixing plate (9), and the fixing plate (9) has a fixing hole.

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