A gas pipeline girth welding device and a welding method

Abstract

The present application relates to the field of engineering machinery, specifically to a kind of gas pipeline circumferential welding equipment and welding method, it includes bottom plate and the welding system being set on bottom plate, welding system is used to clamp two gas pipelines to realize the butt joint of the interface to be welded and simultaneously drive two gas pipelines rotation;Its characterized in that, still include welding auxiliary mechanism, welding auxiliary mechanism is used to heat the pipeline at the position before welding and cool the weld after welding, while the surface cleaning of weld is carried out, wherein the cooling of weld includes room temperature air cooling and cold air rapid cooling, and room temperature air cooling and cold air rapid cooling area moves along the circumference of gas pipeline;Control system is arranged on bottom plate, control system is connected with welding system and welding auxiliary mechanism is controlled.The present application is preheated before welding, and the welding quality and welding efficiency are improved by rapid cooling after welding.And can complete the cleaning and postweld annealing of weld without turning process.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, and in particular to a circumferential welding device and welding method for gas pipelines. Background Technology

[0002] A gas pipeline is a pipeline system used to transport fuel gases such as natural gas or liquefied petroleum gas. It is usually composed of steel pipes. During the production and use of gas pipelines, a large amount of welding and lengthening work is required. Two sections of gas pipeline are connected by circumferential welding.

[0003] Chinese invention patent application CN116493834A discloses a pipe welding device, vehicle, and welding method. By forming multiple notches and grooves on the inner circumferential wall of the sealed track, when the pipe has slight roundness deformation, the notches and grooves allow the annular track to change its own curvature according to the curvature change of the pipe. The welding mechanism set on the annular track moves automatically to realize the automatic welding of the joint between two pipes, thereby improving the welding efficiency.

[0004] However, the above-mentioned disclosed solutions have the following shortcomings: the weld is not cooled in time, and the slow cooling rate will increase the size of the heat-affected zone, which will easily reduce the connection strength near the weld. In addition, the weld needs to be cleaned after welding, which adds extra steps and reduces welding efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems in the prior art where the weld cannot be cooled quickly, which easily reduces the connection strength near the weld and the weld cannot be cleaned during the welding process, thus reducing welding efficiency. The invention proposes a circumferential welding device and welding method for gas pipelines.

[0006] On one hand, this invention proposes a circumferential welding device for gas pipelines, including a base plate and a welding system mounted on the base plate. The welding system is used to clamp two gas pipeline sections to achieve the connection of the interfaces to be welded and to simultaneously drive the two gas pipeline sections to rotate. The device is characterized by further including a welding auxiliary mechanism, which is used to heat the pipeline at the pre-welding position and cool the weld after welding, while simultaneously cleaning the surface of the weld. The weld cooling includes room temperature air cooling and rapid cooling with cold air, and the room temperature air cooling and rapid cooling with cold air zones move circumferentially along the gas pipeline. A control system is mounted on the base plate, and the control system is connected to both the welding system and the welding auxiliary mechanism.

[0007] Preferably, the welding system includes a clamping mechanism, a rotating mechanism a, a rotating mechanism b, a welding mechanism, a slide rail a, a slide rail b, and a welding support base; slide rail a and slide rail b are arranged parallel to each other on the base plate; rotating mechanism a and rotating mechanism b are both slidably mounted on slide rail a, and rotating mechanism a and rotating mechanism b are respectively connected to two sets of clamping mechanisms and drive the clamping mechanisms to rotate, the two sets of clamping mechanisms are used to clamp the ends of the two gas pipelines; the welding mechanism is mounted on the welding support base, the welding point of the welding mechanism is located above the splice of the two gas pipelines, and the welding support base is slidably mounted on slide rail b.

[0008] Preferably, multiple sets of support mechanisms are slidably arranged on slide rail a, the support mechanisms are supported at the bottom of the gas pipeline, and the gas pipeline is in rolling contact with the support mechanisms.

[0009] Preferably, the welding auxiliary mechanism includes a sliding seat, a support plate a, an arc-shaped plate a, a hot gas box, a support plate b, an arc-shaped plate b, an arc-shaped plate c, a cold gas box, and an arc-shaped sliding plate. The sliding seat is slidably mounted on the base plate, and multiple sets of locking bolts are provided on the sliding seat to fix its position. The sliding direction is parallel to the axis of the gas pipeline. The support plate a is mounted on the sliding seat. The outer wall of the arc-shaped plate a is connected to the top of the support plate a, and the arc-shaped plate a is in close contact with the outer walls of both sections of the gas pipeline. An arc-shaped groove a is provided on the inner circumferential wall of the arc-shaped plate a. The width of the arc-shaped groove a is greater than the width of the weld. Multiple vent holes a and a steel brush are provided on the groove wall of the arc-shaped groove a, and the bristles of the steel brush are in contact with the outer wall of the gas pipeline. The hot gas box is mounted on the outer wall of the arc-shaped plate a, and the inner cavity of the hot gas box is connected to multiple sets of vent holes a. The support plate b is mounted on the sliding seat. The arc-shaped plate b is mounted on top of the support plate b, and the arc-shaped plate c is rotatably mounted on the arc-shaped plate b. Plate C rotates circumferentially along the gas pipeline. The inner wall of the arc-shaped plate C is in contact with the outer walls of the two gas pipeline sections. An arc-shaped groove b is provided on the inner circumferential wall of the arc-shaped plate C. Multiple vent holes b are provided on the groove wall of the arc-shaped groove b. An elastic baffle is provided on the top groove wall of the arc-shaped groove b. The elastic baffle is in contact with the outer circumferential walls of the two gas pipeline sections. A cold air box is provided on the outer wall of the arc-shaped plate C. The inner cavity of the cold air box is connected to the inner cavity of the multiple vent holes b. An arc-shaped sliding plate is slidably provided on the end face of the arc-shaped plate C facing away from the arc-shaped plate b. The arc-shaped sliding plate slides circumferentially along the gas pipeline. A jet pipe is provided on the top of the arc-shaped sliding plate. The jet pipe is located above the arc-shaped plate C and faces the weld. The jet pipe sprays gas along the axial direction of the gas pipeline. A temperature control component is provided on the sliding seat. The temperature control component is used to introduce hot gas to preheat the gas pipeline into the hot air box, cold gas to rapidly cool the weld into the cold air box, and room temperature airflow into the jet pipe to cool the weld at room temperature.

[0010] Preferably, it also includes a hot gas blocking plate, a limiting rod, a baffle, and a spring; an installation groove is provided at the top of the arc-shaped groove a, the hot gas blocking plate is slidably mounted on the inner wall of the installation groove in the vertical direction, and the bottom of the hot gas blocking plate is in close contact with the outer walls of the two gas pipelines; the limiting rod is vertically mounted on the top of the hot gas blocking plate, and the top of the limiting rod passes through the top wall of the installation groove and is connected to the baffle; the spring is sleeved on the limiting rod, and the two ends of the spring are respectively connected to the arc-shaped plate a and the baffle, and the spring is in a natural state or a stretched state.

[0011] Preferably, a slag receiving box is provided on the support plate a, and the slag receiving box is located below the arc-shaped plate a.

[0012] Preferably, an adjustment rod is provided at the bottom of the arc-shaped slide plate, an arc-shaped groove is provided on the arc-shaped plate c for the arc-shaped slide plate to be inserted, and an elastic contact layer is provided on the arc-shaped plate c, which is in contact with the inner wall of the arc-shaped groove.

[0013] Preferably, the temperature control assembly includes a vortex tube, a cold air pipe, a hot air pipe, a branch pipe, and a flexible hose; the vortex tube is mounted on a sliding seat, compressed gas is introduced into the input pipe of the vortex tube, a branch pipe is mounted on the input pipe, and solenoid valves are mounted on both the branch pipe and the input pipe; the cold air output end of the vortex tube is connected to the cold air pipe, and the other end of the cold air pipe is connected to the cold air box; the hot air output end of the vortex tube is connected to the hot air pipe, and the other end of the hot air pipe is connected to the hot air box; one end of the branch pipe is connected to the flexible hose, and the other end of the flexible hose is connected to the jet pipe.

[0014] On the other hand, the present invention proposes a welding method for a circumferential welding device for gas pipelines, comprising the following steps: S1. The two gas pipe ends are clamped together by the welding system and the welding interface is relatively close to each other, while maintaining a certain welding gap. The inner wall of the arc plate c and the arc plate a are simultaneously attached to the two gas pipes to provide stable support for the welded end of the gas pipe. S2. Compressed gas is introduced into the vortex tube, and cold air, hot air and room temperature gas are output through the cold air pipe, hot air pipe and hose respectively. The cold air enters the cold air box and is sprayed toward the weld through the vent b. The hot air enters the hot air box and is sprayed toward the gas pipeline through the vent a. S3. Start welding and rotate the two gas pipelines simultaneously. Preheat the position before welding. After welding, the weld seam is cooled by room temperature air cooling and then by cold air rapid cooling. The gas pipeline rotates one revolution to complete the circumferential welding. S4. Continue to rotate the gas pipeline more than one turn to complete the post-weld annealing of the weld under the alternating action of hot air, room temperature and cold air; S5. Close the intake solenoid valve of the vortex tube. The compressed air is directly sprayed onto the weld through the hose and jet pipe. Continue to rotate the gas pipeline more than one revolution to complete the weld cooling after post-weld annealing.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: 1. Hot air is sprayed onto the gas pipeline for preheating before welding; room temperature gas is sprayed onto the weld for initial cooling; and cold air is sprayed onto the weld for rapid cooling. Furthermore, the preheating with room temperature air reduces the cooling gradient of the weld, preventing embrittlement and cracking caused by rapid cooling. Through preheating, post-weld air cooling, and rapid cooling, both welding quality and efficiency are improved. 2. Before welding, the steel brush contacts the outer wall of the gas pipeline to clean the outer wall of the pipeline, which further ensures the welding quality. After welding, during the rotation of the gas pipeline, the steel brush cleans the weld surface. The weld can be cleaned without transferring the process, which improves the welding efficiency. 3. By heating and then cooling the weld after welding, the weld can be annealed, which can reduce residual stress, improve grain structure, eliminate porosity and inclusions, improve corrosion resistance and toughness, thereby further improving the quality of the weld. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the welding auxiliary mechanism; Figure 3 for Figure 2 Axonometric drawing; Figure 4 for Figure 2 Rear view; Figure 5 for Figure 4 Enlarged diagram of point A in the diagram; Reference numerals: 1. Base plate; 2. Clamping mechanism; 3. Rotating mechanism a; 4. Rotating mechanism b; 5. Welding mechanism; 6. Slide rail a; 7. Slide rail b; 8. Support mechanism; 9. Welding auxiliary mechanism; 10. Welding support seat; 11. Sliding seat; 12. Support plate a; 13. Arc plate a; 14. Hot air box; 15. Arc groove a; 16. Steel brush; 17. Vent hole a; 18. Hot air sealing plate; 19. 20. Mounting slot; 21. Limiting rod; 22. Baffle; 23. Spring; 24. Slag receiving box; 25. Support plate b; 26. Arc plate b; 27. Arc plate c; 28. Cold air box; 29. ​​Arc groove b; 30. Vent hole b; 31. Elastic baffle; 32. Arc sliding plate; 33. Jet pipe; 34. Adjusting rod; 35. Vortex pipe; 36. Cold air pipe; 37. Hot air pipe; 38. Branch pipe; 39. Flexible hose. Detailed Implementation

[0017] Example 1, such as Figure 1As shown, the present invention proposes a circumferential welding device for gas pipelines, including a base plate 1 and a welding system mounted on the base plate 1. The welding system is used to clamp two gas pipeline sections to achieve the docking of the interfaces to be welded and to synchronously drive the two gas pipeline sections to rotate. The device is characterized by further including a welding auxiliary mechanism 9, which is used to heat the pipeline at the pre-welding position and cool the weld after welding, while simultaneously cleaning the weld surface. The weld cooling includes room temperature air cooling and rapid cooling with cold air, and the room temperature air cooling and rapid cooling with cold air zones move circumferentially along the gas pipeline. A control system is mounted on the base plate 1, and the control system is connected to both the welding system and the welding auxiliary mechanism 9.

[0018] Welding-related information: Preheating before welding is to reduce thermal stress and thermal deformation during the welding process, improving the quality and reliability of the weld. Rapid cooling of the weld is to reduce microstructure transformation and stress concentration by rapidly lowering the temperature of the welding area. Post-weld annealing refers to the process of heating and then cooling the weld after welding.

[0019] Working principle: The welding system clamps the ends of two gas pipe sections, bringing the welding joints close together while maintaining a certain welding gap. Welding begins with both gas pipe sections rotating synchronously. Preheating is performed before welding. After welding, the weld seam is sequentially cooled by room temperature air cooling and then by rapid cooling with cold air. One rotation of the gas pipe completes the circumferential welding. The gas pipe continues to rotate more than one revolution, and post-weld annealing is completed under the alternating action of hot air, room temperature air cooling, and cold air. Preheating and rapid cooling with cold air are then turned off, while room temperature air cooling remains on. The gas pipe continues to rotate more than one revolution to complete the post-weld annealing and weld cooling process.

[0020] In this embodiment, hot air is sprayed onto the gas pipeline for preheating before welding, room temperature gas is sprayed onto the weld for initial cooling, and cold air is sprayed onto the weld for rapid cooling. Furthermore, the preheating with room temperature air reduces the cooling gradient of the weld, preventing embrittlement and cracking caused by rapid cooling. By preheating before welding, post-weld air cooling, and rapid cooling, welding quality is improved, and weld cooling can be completed without changing processes, increasing welding efficiency. In addition, post-weld annealing, achieved through heating and then cooling the weld, reduces stress, improves grain structure, eliminates porosity and inclusions, enhances corrosion resistance, and improves toughness, thereby further improving weld quality.

[0021] Example 2, as follows Figure 1As shown, the circumferential welding equipment for gas pipelines proposed in this invention, compared to Embodiment 1, includes a welding system comprising a clamping mechanism 2, a rotating mechanism a3, a rotating mechanism b4, a welding mechanism 5, a slide rail a6, a slide rail b7, and a welding support base 10. Slide rails a6 and b7 are arranged parallel to each other on the base plate 1. Rotating mechanisms a3 and b4 are both slidably mounted on slide rail a6, and are respectively connected to two sets of clamping mechanisms 2 and drive the clamping mechanisms 2 to rotate. The two sets of clamping mechanisms 2 are used to clamp the ends of two gas pipeline sections. The welding mechanism 5 is mounted on the welding support base 10, and the welding point of the welding mechanism 5 is located above the joint of the two gas pipeline sections. The welding support base 10 is slidably mounted on slide rail b7. Multiple sets of support mechanisms 8 are slidably mounted on slide rail a6, supporting the bottom of the gas pipeline, and the gas pipeline rolls in contact with the support mechanisms 8.

[0022] In this embodiment, two sets of clamping mechanisms 2 clamp and fix the ends of two gas pipelines, and then the rotating mechanisms a3 and b4 drive the gas pipelines to rotate to achieve circumferential welding. The rotating mechanisms a3 and b4 are both slidably mounted on the slide rail a6, which can realize the circumferential splicing welding of gas pipelines of different lengths. The welding support 10 is slidably mounted on the slide rail b7, which can realize welding at different positions and is convenient to be adjusted according to actual needs.

[0023] Example 3, as follows Figures 2-4As shown, the circumferential welding equipment for gas pipelines proposed in this invention, compared with Embodiment 1 or Embodiment 2, includes a welding auxiliary mechanism 9 comprising a sliding seat 11, a support plate a12, an arc-shaped plate a13, a hot gas box 14, a support plate b24, an arc-shaped plate b25, an arc-shaped plate c26, a cold gas box 27, and an arc-shaped sliding plate 31; the sliding seat 11 is slidably mounted on the base plate 1, and multiple sets of locking bolts are provided on the sliding seat 11 to fix its position, with the sliding direction parallel to the axial direction of the gas pipeline; the support plate a12 is mounted on the sliding seat 11; the outer wall of the arc-shaped plate a13 is connected to the top of the support plate a12, and the arc-shaped plate a13... The arc plate a13 is in close contact with the outer walls of both gas pipeline sections. An arc groove a15 is provided on the inner circumferential wall of the arc plate a13. The width of the arc groove a15 is greater than the weld width. Multiple vent holes a17 and a steel brush 16 are provided on the wall of the arc groove a15. The bristles of the steel brush 16 are in contact with the outer wall of the gas pipeline. A hot gas box 14 is installed on the outer wall of the arc plate a13, and its inner cavity is connected to multiple sets of vent holes a17. A support plate b24 is installed on the sliding seat 11. An arc plate b25 is installed on top of the support plate b24, and an arc plate c26 is rotatably mounted on the arc plate b25. The arc plate c26 rotates circumferentially along the gas pipeline. The inner wall of the arc-shaped plate c26 is in contact with the outer walls of the two gas pipe sections. An arc-shaped groove b28 is provided on the inner circumferential wall of the arc-shaped plate c26, and multiple vent holes b29 are provided on the groove wall of the arc-shaped groove b28. An elastic baffle 30 is provided on the top wall of the arc-shaped groove b28, and the elastic baffle 30 is in contact with the outer circumferential walls of the two gas pipe sections. A cold air box 27 is provided on the outer wall of the arc-shaped plate c26, and the inner cavity of the cold air box 27 communicates with the inner cavities of the multiple vent holes b29. An arc-shaped sliding plate 31 is slidably disposed on the end face of the arc-shaped plate c26 facing away from the arc-shaped plate b25. The arc-shaped sliding plate 31 slides along the circumference of the gas pipe, and the bottom of the arc-shaped sliding plate 31 is provided with… An adjusting rod 33 is provided. An arc-shaped groove is provided on the arc-shaped plate c26 for the arc-shaped sliding plate 31 to be inserted. An elastic contact layer is provided on the arc-shaped plate c26. The elastic contact layer is in contact with the inner wall of the arc-shaped sliding groove. An air jet pipe 32 is provided on the top of the arc-shaped sliding plate 31. The air jet pipe 32 is located above the arc-shaped plate c26 and faces the weld. The air jet pipe 32 sprays air along the axial direction of the gas pipeline. A temperature control component is provided on the sliding seat 11. The temperature control component is used to introduce hot air for preheating the gas pipeline into the hot air box 14, cold air for rapidly cooling the weld into the cold air box 27, and room temperature airflow into the air jet pipe 32 to cool the weld at room temperature.

[0024] In this embodiment, hot air is sprayed onto the gas pipeline for preheating before welding, room temperature gas is sprayed onto the weld for initial cooling, and cold air is sprayed onto the weld for rapid cooling. Furthermore, the preheating with room temperature air reduces the cooling gradient of the weld, preventing embrittlement and cracking caused by rapid cooling. Preheating before welding, post-weld air cooling, and rapid cooling improve both welding quality and efficiency. Before welding, the steel brush 16 contacts the outer wall of the gas pipeline for cleaning, further ensuring welding quality. After welding, as the gas pipeline rotates, the steel brush 16 cleans the weld surface, eliminating the need for a transfer process and improving welding efficiency. Additionally, post-weld annealing through heating and then cooling the weld reduces stress, improves grain structure, eliminates porosity and inclusions, enhances corrosion resistance, and improves toughness, thereby further improving weld quality.

[0025] Example 4, as follows Figure 5 As shown, the circumferential welding equipment for gas pipelines proposed in this invention, compared with Embodiment 1, Embodiment 2, or Embodiment 3, further includes a hot gas sealing plate 18, a limiting rod 20, a baffle 21, and a spring 22; an installation groove 19 is provided at the top of the arc-shaped groove a15, and the hot gas sealing plate 18 is slidably disposed on the inner wall of the installation groove 19 in the vertical direction, with the bottom of the hot gas sealing plate 18 in close contact with the outer walls of the two sections of gas pipeline; the limiting rod 20 is vertically disposed at the top of the hot gas sealing plate 18, and the top of the limiting rod 20 passes through the top groove wall of the installation groove 19 and is connected to the baffle 21; the spring 22 is sleeved on the limiting rod 20, and both ends of the spring 22 are connected to the arc-shaped plate a13 and the baffle 21 respectively, and the spring 22 is in a natural state or a stretched state. A slag collection box 23 is provided on the support plate a12, and the slag collection box 23 is located below the arc-shaped plate a13.

[0026] In this embodiment, when preheating the gas pipeline with hot gas before welding, the top opening of the arc-shaped groove a15 is sealed by the hot gas sealing plate 18. This prevents hot gas from spraying along the top opening of the arc-shaped groove a15 towards the welding mechanism 5, avoiding the hot gas affecting the welding and ensuring the welding quality. When the weld seam rotates to this point, the sealing plate 18 can move upward, thus not affecting the normal rotation of the pipeline.

[0027] Example 5, as Figure 2As shown, the gas pipeline circumferential welding equipment proposed in this invention, compared with Embodiment 1, Embodiment 2, or Embodiment 3, includes a temperature control component comprising a vortex tube 34, a cold gas pipe 35, a hot gas pipe 36, a branch pipe 37, and a flexible hose 38. The vortex tube 34 is mounted on a sliding seat 11. Compressed gas is introduced into the input pipe of the vortex tube 34. A branch pipe 37 is mounted on the input pipe. Solenoid valves are mounted on both the branch pipe 37 and the input pipe. The cold gas output end of the vortex tube 34 is connected to the cold gas pipe 35, and the other end of the cold gas pipe 35 is connected to the cold gas box 27. The hot gas output end of the vortex tube 34 is connected to the hot gas pipe 36, and the other end of the hot gas pipe 36 is connected to the hot gas box 14. One end of the branch pipe 37 is connected to one end of the flexible hose 38, and the other end of the flexible hose 38 is connected to the jet pipe 32.

[0028] In this embodiment, compressed air is introduced into the vortex tube 34 to output cold air and hot air. The hot air is used for welding preheating, and the cold air is used for rapid cooling of the weld. At the same time, the compressed air is also introduced into the jet pipe 32 through the hose to perform room temperature air cooling on the weld. Room temperature air cooling is located before the rapid cooling of the weld, which can reduce the temperature gradient of cooling and prevent embrittlement, cracking and other problems caused by overcooling of the weld.

[0029] Example 6: A welding method based on the above-described embodiment of a gas pipeline circumferential welding equipment includes the following steps: S1. The two gas pipe ends are clamped together by the welding system and the welding interface is relatively close to each other, while maintaining a certain welding gap. The inner walls of the arc plate c26 and the arc plate a13 are simultaneously attached to the two gas pipes to provide stable support for the welded ends of the gas pipes. S2. Compressed gas is introduced into the vortex tube 34. Cold air, hot air and room temperature gas are output through the cold air pipe 35, the hot air pipe 36 and the hose 38 respectively. The cold air enters the cold air box 27 and is sprayed toward the weld through the vent b29. The hot air enters the hot air box 14 and is sprayed toward the gas pipeline through the vent a17. S3. Start welding and rotate the two gas pipelines simultaneously. Preheat the position before welding. After welding, the weld seam is cooled by room temperature air cooling and then by cold air rapid cooling. The gas pipeline rotates one revolution to complete the circumferential welding. S4. Continue to rotate the gas pipeline more than one turn to complete the post-weld annealing of the weld under the alternating action of hot air, room temperature and cold air; S5. Close the intake solenoid valve of the vortex tube 34. The compressed air is directly sprayed onto the weld through the hose 38 and the jet pipe 32. Continue to rotate the gas pipeline more than one revolution to complete the cooling of the weld after post-weld annealing.

[0030] In this embodiment, hot air is sprayed onto the gas pipeline for preheating before welding, room temperature gas is sprayed onto the weld for initial cooling, and cold air is sprayed onto the weld for rapid cooling. Furthermore, the preheating with room temperature air reduces the cooling gradient of the weld, preventing embrittlement and cracking caused by rapid cooling. Preheating before welding, post-weld air cooling, and rapid cooling improve both welding quality and efficiency. Before welding, the steel brush 16 contacts the outer wall of the gas pipeline for cleaning, further ensuring welding quality. After welding, as the gas pipeline rotates, the steel brush 16 cleans the weld surface, eliminating the need for a transfer process and improving welding efficiency. Additionally, post-weld annealing, achieved through heating and then cooling the weld, reduces residual stress, improves grain structure, eliminates porosity and inclusions, enhances corrosion resistance, and improves toughness, thereby further improving weld quality.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A circumferential welding device for gas pipelines, comprising a base plate (1) and a welding system disposed on the base plate (1), the welding system being used to clamp two sections of gas pipelines to achieve the butt joint of the interface to be welded and to synchronously drive the two sections of gas pipelines to rotate; characterized in that, It also includes a welding auxiliary mechanism (9), which is used to heat the pipe at the pre-welding position and cool the weld after welding, and clean the surface of the weld. The cooling of the weld includes room temperature air cooling and rapid cooling with cold air, and the room temperature air cooling and rapid cooling with cold air move along the circumference of the gas pipeline. A control system is set on the base plate (1), and the control system is connected to the welding system and the welding auxiliary mechanism (9). The welding auxiliary mechanism (9) includes a sliding seat (11), a support plate a (12), an arc plate a (13), a hot gas box (14), a support plate b (24), an arc plate b (25), an arc plate c (26), a cold gas box (27), and an arc plate slide (31); the sliding seat (11) is slidably mounted on the base plate (1), and multiple sets of locking bolts are provided on the sliding seat (11) to fix its position, and the sliding direction is parallel to the axis of the gas pipeline; the support plate a (12) is mounted on the sliding seat (11); the outer wall of the arc plate a (13) is connected to the top of the support plate a (12), and the arc plate a (13) The arc plate a (13) is in close contact with the outer wall of both gas pipelines. An arc groove a (15) is provided on the inner circumferential wall of the arc plate a (13). The width of the arc groove a (15) is greater than the width of the weld. Multiple vent holes a (17) and steel brushes (16) are provided on the wall of the arc groove a (15). The bristles of the steel brushes (16) are in contact with the outer wall of the gas pipeline. A hot gas box (14) is provided on the outer wall of the arc plate a (13). The inner cavity of the hot gas box (14) is connected to multiple sets of vent holes a (17). A support plate b (24) is provided on the sliding seat (11). An arc plate b (25) is provided on the top of the support plate b (24). The arc plate c (26) rotates. The arc plate c (26) is set on the arc plate b (25) and rotates around the gas pipeline. The inner wall of the arc plate c (26) is in contact with the outer wall of the two gas pipeline sections. The arc plate c (26) is provided with an arc groove b (28) on the inner circumferential wall. Multiple vent holes b (29) are provided on the groove wall of the arc groove b (28). An elastic baffle (30) is provided on the top groove wall of the arc groove b (28). The elastic baffle (30) is in contact with the outer circumferential wall of the two gas pipeline sections. The cold air box (27) is set on the outer wall of the arc plate c (26). The inner cavity of the cold air box (27) is connected to the inner cavity of the multiple vent holes b (29). The arc plate slide (31) The sliding plate (31) is located on the end face of the arc plate c (26) facing away from the arc plate b (25). The arc plate (31) slides along the circumference of the gas pipeline. The top of the arc plate (31) is equipped with a jet pipe (32). The jet pipe (32) is located above the arc plate c (26) and faces the weld. The jet pipe (32) sprays gas along the axial direction of the gas pipeline. The sliding seat (11) is equipped with a temperature control component. The temperature control component is used to introduce hot gas to preheat the gas pipeline into the hot gas box (14), to introduce cold gas to quickly cool the weld into the cold gas box (27), and to introduce room temperature airflow into the jet pipe (32) to cool the weld at room temperature.

2. The gas pipeline circumferential welding equipment according to claim 1, characterized in that, The welding system includes a clamping mechanism (2), a rotating mechanism a (3), a rotating mechanism b (4), a welding mechanism (5), a slide rail a (6), a slide rail b (7), and a welding support (10). The slide rail a (6) and the slide rail b (7) are arranged parallel to each other on the base plate (1). The rotating mechanism a (3) and the rotating mechanism b (4) are both slidably arranged on the slide rail a (6). The rotating mechanism a (3) and the rotating mechanism b (4) are respectively connected to the two sets of clamping mechanisms (2) and drive the clamping mechanism (2) to rotate. The two sets of clamping mechanisms (2) are used to clamp the ends of the two gas pipelines. The welding mechanism (5) is arranged on the welding support (10). The welding point of the welding mechanism (5) is located above the splice of the two gas pipelines. The welding support (10) is slidably arranged on the slide rail b (7).

3. The gas pipeline circumferential welding equipment according to claim 2, characterized in that, Multiple sets of support mechanisms (8) are slidably set on the slide rail a (6). The support mechanisms (8) are supported at the bottom of the gas pipeline, and the gas pipeline and the support mechanisms (8) are in rolling contact.

4. The circumferential welding equipment for gas pipelines according to claim 1, characterized in that, It also includes a hot gas blocking plate (18), a limiting rod (20), a baffle (21), and a spring (22); an installation groove (19) is provided at the top of the arc groove a (15), the hot gas blocking plate (18) is slidably installed on the inner wall of the installation groove (19) in the vertical direction, and the bottom of the hot gas blocking plate (18) is in close contact with the outer wall of the two gas pipelines; the limiting rod (20) is vertically installed at the top of the hot gas blocking plate (18), the top of the limiting rod (20) passes through the top groove wall of the installation groove (19) and is connected to the baffle (21); the spring (22) is sleeved on the limiting rod (20), and the two ends of the spring (22) are connected to the arc plate a (13) and the baffle (21) respectively, and the spring (22) is in a natural state or a stretched state.

5. The circumferential welding equipment for gas pipelines according to claim 1, characterized in that, A slag receiving box (23) is provided on the support plate a (12), and the slag receiving box (23) is located below the arc plate a (13).

6. The circumferential welding equipment for gas pipelines according to claim 1, characterized in that, An adjustment rod (33) is provided at the bottom of the arc-shaped slide plate (31). An arc-shaped groove for the arc-shaped slide plate (31) to be inserted is provided on the arc-shaped plate c (26). An elastic contact layer is provided on the arc-shaped plate c (26). The elastic contact layer is in contact with the inner wall of the arc-shaped groove.

7. The circumferential welding equipment for gas pipelines according to claim 1, characterized in that, The temperature control assembly includes a vortex tube (34), a cold air pipe (35), a hot air pipe (36), a branch pipe (37), and a hose (38). The vortex tube (34) is mounted on a sliding seat (11). Compressed gas is introduced into the input pipe of the vortex tube (34). A branch pipe (37) is mounted on the input pipe. Solenoid valves are mounted on both the branch pipe (37) and the input pipe. The cold air output end of the vortex tube (34) is connected to the cold air pipe (35). The other end of the cold air pipe (35) is connected to the cold air box (27). The hot air output end of the vortex tube (34) is connected to the hot air pipe (36). The other end of the hot air pipe (36) is connected to the hot air box (14). One end of the branch pipe (37) is connected to the hose (38). The other end of the hose (38) is connected to the jet pipe (32).

8. A welding method for a circumferential welding device for gas pipelines according to claim 7, characterized in that, Includes the following steps: S1. The two gas pipe ends are clamped together by the welding system and the welding interface is relatively close to each other, with a certain welding gap. The inner walls of the arc plate c (26) and the arc plate a (13) are simultaneously attached to the two gas pipes to provide stable support for the gas pipe welding end. S2. Compressed gas is introduced into the vortex tube (34), and cold gas, hot gas and room temperature gas are output through the cold gas tube (35), hot gas tube (36) and hose (38) respectively. The cold gas enters the cold gas box (27) and is sprayed towards the weld through the vent hole b (29). The hot gas enters the hot gas box (14) and is sprayed towards the gas pipeline through the vent hole a (17). S3. Start welding and rotate the two gas pipelines simultaneously. Preheat the position before welding. After welding, the weld seam is cooled by room temperature air cooling and then by cold air rapid cooling. The gas pipeline rotates one revolution to complete the circumferential welding. S4. Continue to rotate the gas pipeline more than one turn to complete the post-weld annealing of the weld under the alternating action of hot air, room temperature and cold air; S5. Close the intake solenoid valve of the vortex tube (34), and the compressed gas is sprayed directly onto the weld through the hose (38) and the jet pipe (32). Continue to rotate the gas pipeline more than one revolution to complete the cooling of the weld after post-weld annealing.

Images