Weld joint cooling device of automatic welding machine for LNG (Liquefied Natural Gas) conveying pipeline

Abstract

The utility model relates to the technical field of welding seam cooling and provides a welding seam cooling device of an automatic welding machine for an LNG (Liquefied Natural Gas) conveying pipeline, aiming at solving the problems in the prior art that a welding seam is difficult to cool, needs to be clamped and disassembled for multiple times, is complicated to operate, high in labor intensity of workers and low in production efficiency. Comprising a first automatic welding machine and a second automatic welding machine which are parallel to each other and distributed at intervals, an operation control box is arranged between the first automatic welding machine and the second automatic welding machine, and the first automatic welding machine and the second automatic welding machine are electrically connected to the operation control box. The first automatic welding machine and the second automatic welding machine are respectively provided with a first welding gun and a second welding gun for welding, clamps are clamped outside the first welding gun and the second welding gun, and one side of the welding end of the first welding gun and one side of the welding end of the second welding gun are respectively provided with a first cooling device and a second cooling device which are used for cooling welding seams. The welding device has the advantages that welding seams are easy to cool, clamping and dismounting are not needed in the welding process, operation is easy, the labor intensity of workers is low, and production efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding seam cooling technical field, specifically, relate to a kind of welding seam cooling device of LNG delivery pipeline automatic welding machine. BACKGROUND

[0002] LNG delivery pipeline material is austenitic stainless steel, interlayer temperature needs to be strictly controlled below 150 DEG C in the welding process. When each weld is welded, workpiece needs to be taken down for cooling, equipment is rechucked another workpiece welding. After the temperature of previous workpiece drops to 150 DEG C, workpiece is chucked to carry out cover welding, if workpiece thickness is thicker, it needs to be chucked and disassembled multiple times, seriously affect production efficiency. SUMMARY

[0003] The utility model aims at providing a kind of welding seam cooling device of LNG delivery pipeline automatic welding machine, to solve the problem that welding seam is not easy to cool in the welding seam multilayer welding of prior art, needs multiple chucks disassembly, operation is complicated, worker's labor intensity is big and production efficiency is low.

[0004] The embodiment of the utility model is realized as follows:

[0005] The embodiment of the utility model provides a kind of welding seam cooling device of LNG delivery pipeline automatic welding machine, it includes first automatic welding machine and second automatic welding machine;

[0006] The first automatic welding machine and the second automatic welding machine are parallel and spaced apart, and the operation control box is arranged between the first automatic welding machine and the second automatic welding machine, and the first automatic welding machine and the second automatic welding machine are electrically connected to the operation control box.

[0007] The first automatic welding machine and the second automatic welding machine are respectively provided with first welding gun and second welding gun for welding, the first welding gun and the second welding gun are respectively clamped by a clamp, and the welding end side of the first welding gun and the second welding gun is respectively provided with first cooling and temperature reducing device and second cooling and temperature reducing device for cooling welding seam.

[0008] In use, first, the first workpiece is clamped on the first automatic welding machine, the first workpiece is rotated by the operation control box, the first welding gun performs the first layer welding of the first workpiece, after the first layer welding of the first workpiece is completed, the operation control box controls the first cooling device to automatically blow and cool the weld, secondly, the operator clamps the second workpiece on the second automatic welding machine, the second workpiece is rotated by the operation control box, the second welding gun performs the first layer welding of the second workpiece, after the first layer welding of the second workpiece is completed, the operation control box controls the second cooling device to automatically blow and cool the weld, when the first layer welding of the second workpiece is completed, the first layer of the first workpiece has been cooled basically, the first workpiece can be welded again, after the first workpiece is welded, the first workpiece is removed, the second workpiece is welded again, and other workpieces are welded in this way to realize the cycle welding, which effectively saves the welding waiting time, reduces the repeated clamping and dismounting actions, and reduces the labor intensity of workers.

[0009] The welding seam cooling device of the LNG pipeline automatic welding machine disclosed in the embodiment can cool the welding seam, control the temperature between the welding seam layers to be below 150 DEG C, and has the beneficial effects of easy cooling of the welding seam, no need to clamp and dismount during welding, simple operation, low labor intensity of workers, and high production efficiency.

[0010] Optionally, the first cooling device and the second cooling device each have a support fixedly connected to the side of the clamp away from the first welding gun or the second welding gun.

[0011] The support is fixedly connected to the end of the clamp away from the clamp, the adjustable connecting seat is clamped on the adjusting piece, the compressed air pipe is fixedly connected to the connecting seat, and the gas outlet end of the compressed air pipe is close to the welding end of the first welding gun or the second welding gun.

[0012] In this way, the support can support, the connecting seat can be adjusted on the adjusting piece, so that the gas outlet end of the compressed air pipe is close to the welding end of the first welding gun or the second welding gun, and the welding seam can be automatically blown and cooled.

[0013] Optionally, the middle part of the adjusting piece is provided with an arc-shaped through hole, and the connecting seat is clamped on the arc-shaped through hole.

[0014] In this way, the arc-shaped through hole is arranged to facilitate the installation of the connecting seat and the adjustment of the position of the compressed air pipe.

[0015] Optionally, the compressed air pipe has a pipe body, one end of the pipe body close to the first welding gun or the second welding gun is provided with a tapered air blowing nozzle, one end of the pipe body away from the tapered air blowing nozzle is connected with a hose in a sealable manner, and one end of the hose away from the pipe body is connected with an air supply pump.

[0016] In this way, the pipe body is arranged to facilitate fixation, the tapered air blowing nozzle can concentrate high-pressure gas and increase the flow rate of the gas, so that the weld can be cooled as soon as possible, the hose is connected to the pipe body because the positions of the welds of the workpieces to be welded are inconsistent, and the first welding gun or the second welding gun needs to be adjusted according to the position of the weld, so the hose is made away from the first welding gun or the second welding gun to facilitate the movement of the device following the first welding gun or the second welding gun.

[0017] Optionally, the hose is provided with an electromagnetic valve, and the electromagnetic valve is electrically connected with a PLC system for controlling the opening and closing and time of the electromagnetic valve.

[0018] In this way, after each welding is completed, the welding action is stopped, the workpiece continues to rotate, the electromagnetic valve automatically opens the compressed air pipe to blow gas and cool the weld position, and the action can be automatically stopped by setting the time with the PLC system or manually stopped.

[0019] Optionally, the pipe body and the tapered air blowing nozzle are made of red copper or brass.

[0020] In this way, because the device needs to be resistant to high temperature and have a fast heat dissipation speed close to the first welding gun or the second welding gun, the pipe body and the tapered air blowing nozzle are made of red copper or brass to improve the service life of the compressed air pipe.

[0021] Optionally, the first automatic welding machine and the second automatic welding machine each have a first bottom beam and a second bottom beam, the first bottom beam and the second bottom beam are parallel to each other and spaced apart, and a welding gun control mechanism and a pipeline fixing mechanism are fixedly connected between the top surfaces of the first bottom beam and the second bottom beam.

[0022] Thus, the first bottom beam and the second bottom beam serve as a support platform, effectively raising the welding gun control mechanism and the pipeline fixing mechanism, avoiding direct contact with the ground and being eroded or contaminated, while the first bottom beam and the second bottom beam are convenient to replace, making the welding gun control mechanism and the pipeline fixing mechanism suitable for different installation positions, improving the flexibility of equipment installation.

[0023] Optionally, the welding gun control mechanism has a first support column and a second support column, the first support column is fixedly connected to the top surface of the first bottom beam, the second support column is fixedly connected to the top surface of the second bottom beam, and a track is fixedly connected between the top surfaces of the first support column and the second support column, the track clamps a clamping seat that can automatically slide, a vertical seat is fixedly connected to one end of the clamping seat close to the pipeline fixing mechanism, a sliding block is slidably connected to one side of the vertical seat close to the pipeline fixing mechanism, the sliding block is vertically slidably fitted along the vertical seat, and the clamp is fixedly connected to the side of the sliding block away from the vertical seat.

[0024] The welding gun control mechanism is electrically connected to the operation control box.

[0025] Thus, by controlling the movement of the clamping seat along the track through the operation control box, the first welding gun or the second welding gun can be adjusted to move along the axial direction of the workpiece, and by controlling the vertical sliding of the sliding block in the vertical seat through the operation control box, the first welding gun or the second welding gun can be adjusted to move along the radial direction of the workpiece, so that the first welding gun or the second welding gun can be adjusted in position according to the welding position and diameter of the workpiece.

[0026] Optionally, the pipeline fixing mechanism has a support platform, a main shaft box for clamping the pipeline and a jack for adjusting the height are respectively arranged on the top surface of the support platform along the central axis, and the main shaft box and the jack are adjustably fixedly connected to the top surface of the support platform.

[0027] The main shaft box has a clamping jaw at one end close to the jack, and the top of the jack has a limiting clamp.

[0028] The pipeline fixing mechanism is electrically connected to the operation control box.

[0029] Thus, by clamping one end of the workpiece on the clamping jaw, the main shaft box controls the rotation of the clamping jaw, the jack adjusts the height according to the position of the workpiece and clamps the limiting clamp on the workpiece, so as to support the workpiece, and then the first welding gun or the second welding gun can weld the workpiece.

[0030] Optionally, one side of the main shaft box is provided with a controller for controlling the opening and closing of the clamping jaw.

[0031] In this way, the controller can control the opening and closing of the clamping jaw. When it is necessary to clamp the workpiece, the clamping jaw is closed by the controller, so that the workpiece is clamped. When it is necessary to remove the workpiece, the controller can control the clamping jaw to be opened, so that the workpiece is removed.

[0032] In summary, the welding seam cooling device of the LNG conveying pipeline automatic welding machine has the beneficial effects of easy cooling of the welding seam, no need to clamp and disassemble during welding, simple operation, low labor intensity of workers and high production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 It is a double-station layout diagram of the first automatic welding machine and the second automatic welding machine in the embodiments of the present application.

[0035] Figure 2 It is a structural schematic diagram of the first cooling and temperature reducing device or the second cooling and temperature reducing device in the embodiments of the present application.

[0036] Figure 3 It is a structural schematic diagram of the welding gun control mechanism in the embodiments of the present application.

[0037] Figure 4 It is a structural schematic diagram of the compressed air pipe in the embodiments of the present application.

[0038] Legend: 1-first automatic welding machine, 2-second automatic welding machine, 3-operation control box, 4-first welding gun, 5-second welding gun, 6-clamp, 7-first cooling and temperature reducing device, 8-second cooling and temperature reducing device, 9-bracket, 10-adjusting piece, 11-connection seat, 12-compressed air pipe, 13-arc-shaped through hole, 14-pipe body, 15-tapered air blowing nozzle, 16-hose, 17-first bottom beam, 18-second bottom beam, 19-welding gun control mechanism, 20-pipe fixing mechanism, 21-first supporting column, 22-second supporting column, 23-rail, 24-clamping seat, 25-vertical seat, 26-sliding block, 27-supporting platform, 28-main shaft box, 29-jack, 30-clamping jaw, 31-limiting clamp, 32-controller. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0041] Embodiments

[0042] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the present embodiment proposes a welding seam cooling device of an LNG conveying pipeline automatic welding machine, comprising a first automatic welding machine 1 and a second automatic welding machine 2;

[0043] The first automatic welding machine 1 and the second automatic welding machine 2 are mutually parallel and spaced apart, and an operation control box 3 is arranged between the first automatic welding machine 1 and the second automatic welding machine 2. The first automatic welding machine 1 and the second automatic welding machine 2 are respectively electrically connected to the operation control box 3.

[0044] The first automatic welding machine 1 and the second automatic welding machine 2 respectively have a first welding gun 4 and a second welding gun 5 for welding. The first welding gun 4 and the second welding gun 5 are respectively provided with a clamp 6 outside. The welding end side of the first welding gun 4 and the second welding gun 5 is respectively provided with a first cooling and cooling device 7 and a second cooling and cooling device 8 for cooling the welding seam.

[0045] In use, first, the first workpiece is clamped on the first automatic welding machine 1, the first workpiece is rotated by operating the control box 3 to control the first automatic welding machine 1, the first welding gun 4 performs the first layer welding of the first workpiece, after the first layer welding of the first workpiece is completed, the control box 3 controls the first cooling device 7 to automatically blow and cool the weld, secondly, the operator clamps the second workpiece on the second automatic welding machine 2, the second workpiece is rotated by operating the control box 3 to control the second automatic welding machine 2, the second welding gun 5 performs the first layer welding of the second workpiece, after the first layer welding of the second workpiece is completed, the control box 3 controls the second cooling device 8 to automatically blow and cool the weld, when the first layer welding of the second workpiece is completed, the first layer of the first workpiece has been cooled basically, the first workpiece can be welded again, after the first workpiece is welded, the first workpiece is taken down, the second workpiece is welded again, and other workpieces can be welded in the above manner to realize the cycle welding, the waiting time for welding is saved effectively, the action of repeated clamping and dismounting is reduced, and the labor intensity of workers is reduced.

[0046] The welding seam cooling device of the LNG pipeline automatic welding machine disclosed in the embodiment is provided with the first cooling device 7 and the second cooling device 8 on the side of the welding end of the first welding gun 4 and the second welding gun 5, so that the welding seam can be cooled, and the temperature between the layers of the welding seam can be controlled below 150 DEG C. Meanwhile, the double-station layout of the first automatic welding machine 1 and the second automatic welding machine 2 is adopted, so that the operator can control the first automatic welding machine 1 and the second automatic welding machine 2 at the same time, the workpiece is clamped once, and then continuously welded, and the function of not needing to dismount in the middle of welding is realized, so that the welding seam cooling device of the LNG pipeline automatic welding machine has the beneficial effects of easy cooling of the welding seam, no need to clamp and dismount in the middle of welding, simple operation, low labor intensity of workers and high production efficiency.

[0047] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the first cooling device 7 and the second cooling device 8 are both provided with a support 9, and the support 9 is fixedly connected to the side of the clamp 6 away from the first welding gun 4 or the second welding gun 5.

[0048] The end of the support 9 away from the clamp 6 is fixedly connected with an adjusting piece 10, the adjusting piece 10 is clamped with an adjustable connecting seat 11, the connecting seat 11 is fixedly connected with a compressed air pipe 12, the air outlet end of the compressed air pipe 12 is close to the welding end of the first welding gun 4 or the second welding gun 5, the support 9 can support, and the position of the connecting seat 11 can be adjusted on the adjusting piece 10, so that the air outlet end of the compressed air pipe 12 is close to the welding end of the first welding gun 4 or the second welding gun 5, and the blow cooling of the welding seam is realized.

[0049] The middle part of the adjusting piece 10 is provided with an arc-shaped through hole 13, and the connecting seat 11 is clamped on the arc-shaped through hole 13. The arc-shaped through hole 13 is arranged to facilitate the installation of the connecting seat 11 and the position adjustment of the compressed air pipe 12.

[0050] The compressed air pipe 12 has a pipe body 14, one end of the pipe body 14 close to the first welding gun 4 or the second welding gun 5 is provided with a tapered blow nozzle 15, and the other end of the pipe body 14 away from the tapered blow nozzle 15 is sealingly connected with a hose 16. The other end of the hose 16 away from the pipe body 14 is connected with an air supply pump (not shown in the figure). The pipe body 14 is arranged to facilitate fixation, and the tapered blow nozzle 15 can concentrate high-pressure gas and increase the flow rate of the gas, so that the weld can be cooled as soon as possible. The pipe body 14 is connected with the hose 16 because the positions of the welds of the workpieces to be welded are inconsistent. The first welding gun 4 or the second welding gun 5 needs to be adjusted according to the position of the weld. Therefore, the hose 16 is made away from the position of the first welding gun 4 or the second welding gun 5 to facilitate the movement of the device following the first welding gun 4 or the second welding gun 5.

[0051] The hose 16 is provided with a solenoid valve (not shown in the figure), and the solenoid valve is electrically connected with a PLC system (not shown in the figure) for controlling the opening and closing and time of the solenoid valve. After each welding is completed, the welding action is stopped, the workpiece continues to rotate, the solenoid valve is automatically opened, the compressed air pipe 12 is aligned with the position of the weld to blow gas for cooling and temperature reduction. The action stop can be automatically stopped by setting the time of the PLC system, or it can be manually stopped.

[0052] The pipe body 14 and the tapered blow nozzle 15 are made of red copper or brass. Because the position close to the first welding gun 4 or the second welding gun 5 needs to be resistant to high temperature and have fast heat dissipation, the pipe body 14 and the tapered blow nozzle 15 are made of red copper or brass to improve the service life of the compressed air pipe 12.

[0053] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the first automatic welding machine 1 and the second automatic welding machine 2 are both provided with a first bottom beam 17 and a second bottom beam 18. The first bottom beam 17 and the second bottom beam 18 are parallel to each other and spaced apart. The top surfaces of the first bottom beam 17 and the second bottom beam 18 are fixedly connected with a welding gun control mechanism 19 and a pipeline fixing mechanism 20. The first bottom beam 17 and the second bottom beam 18 serve as a supporting platform, effectively lifting the welding gun control mechanism 19 and the pipeline fixing mechanism 20, avoiding the welding gun control mechanism 19 and the pipeline fixing mechanism 20 from being directly contacted with the ground and being eroded or contaminated. At the same time, the first bottom beam 17 and the second bottom beam 18 are convenient to replace, so that the welding gun control mechanism 19 and the pipeline fixing mechanism 20 are suitable for different installation positions, improving the flexibility of equipment installation.

[0054] The welding gun control mechanism 19 has a first supporting column 21 and a second supporting column 22, the first supporting column 21 is fixedly connected on the top surface of the first bottom beam 17 vertically, the second supporting column 22 is fixedly connected on the top surface of the second bottom beam 18 vertically, the top surfaces of the first supporting column 21 and the second supporting column 22 are fixedly connected with a track 23, the track 23 clamps a clamping seat 24 which can slide automatically, the clamping seat 24 is fixedly connected with a vertical seat 25 on the end close to the pipe fixing mechanism 20 vertically, the vertical seat 25 is slidably connected with a sliding block 26 on the side close to the pipe fixing mechanism 20, the sliding block 26 is vertically slidingly fitted on the vertical seat 25, the clamp 6 is fixedly connected on the side of the sliding block 26 away from the vertical seat 25; the welding gun control mechanism 19 is electrically connected to the operation control box 3, the first welding gun 4 or the second welding gun 5 can be adjusted to move along the axial direction of the workpiece by controlling the clamping seat 24 to move along the track 23 through the operation control box 3, the first welding gun 4 or the second welding gun 5 can be adjusted to move along the radial direction of the workpiece by controlling the sliding block 26 to slide vertically on the vertical seat 25 through the operation control box 3, so that the first welding gun 4 or the second welding gun 5 can be adjusted according to the position and diameter of the workpiece.

[0055] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the pipe fixing mechanism 20 has a supporting platform 27, the top surface of the supporting platform 27 is provided with a main shaft box 28 for clamping the pipe and a jack 29 for adjusting the height on the central axis respectively, the main shaft box 28 and the jack 29 are fixedly connected on the top surface of the supporting platform 27 and can be adjusted; the end of the main shaft box 28 close to the jack 29 has a clamping jaw 30, and the top of the jack 29 has a limiting clamp 31; the pipe fixing mechanism 20 is electrically connected to the operation control box 3, one end of the workpiece is clamped on the clamping jaw 30, the main shaft box 28 controls the clamping jaw 30 to rotate, the jack 29 adjusts the height according to the position of the workpiece and makes the limiting clamp 31 clamp on the workpiece, so as to play a role of supporting the workpiece, and then the first welding gun 4 or the second welding gun 5 can weld the workpiece.

[0056] One side of the main shaft box 28 is provided with a controller 32 for controlling the opening and closing of the clamping jaw 30, the controller 32 can control the opening and closing of the clamping jaw 30, when the workpiece needs to be clamped, the controller 32 controls the clamping jaw 30 to close, so that the workpiece can be clamped tightly, when the workpiece needs to be taken out, the controller 32 can control the clamping jaw 30 to open, so that the workpiece can be taken out.

[0057] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4In the embodiment, the first automatic welding machine 1 and the second automatic welding machine 2 are arranged opposite to each other according to the use requirement, and can also be arranged in a linear type, as long as a position for an operator to operate is reserved. The operation control box 3 is arranged at a middle position between the first automatic welding machine 1 and the second automatic welding machine 2, so that one person can operate two stations, and meanwhile, the welding of the welds of two workpieces can be continuously carried out. When the first workpiece is cooled, the second workpiece is welded. When the welding of the second workpiece is completed and the second workpiece is cooled, the first workpiece has been cooled to below 150 DEG C, so that the surface welding can be continuously carried out. After the welding of the first workpiece is completed, the first workpiece is taken out, and the surface welding of the second workpiece is carried out again. Other workpieces are welded in the above manner.

[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A weld seam cooling device for an automatic welding machine for LNG pipelines, characterized in that: Includes a first automatic welding machine (1) and a second automatic welding machine (2); The first automatic welding machine (1) and the second automatic welding machine (2) are parallel to each other and spaced apart. An operation control box (3) is provided between the first automatic welding machine (1) and the second automatic welding machine (2). The first automatic welding machine (1) and the second automatic welding machine (2) are electrically connected to the operation control box (3). The first automatic welding machine (1) and the second automatic welding machine (2) respectively have a first welding gun (4) and a second welding gun (5) for welding. The first welding gun (4) and the second welding gun (5) are both clamped with a clamp (6). The first welding gun (4) and the second welding gun (5) are respectively provided with a first cooling device (7) and a second cooling device (8) for cooling the weld seam on one side of the welding end.

2. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 1, characterized in that: Both the first cooling device (7) and the second cooling device (8) have brackets (9), which are fixedly connected to the side of the clamp (6) away from the first welding gun (4) or the second welding gun (5). An adjusting plate (10) is fixedly connected to one end of the bracket (9) away from the clamp (6). An adjustable connecting seat (11) is clamped on the adjusting plate (10). A compressed air pipe (12) is fixedly connected to the connecting seat (11). The air outlet end of the compressed air pipe (12) is close to the welding end of the first welding gun (4) or the second welding gun (5).

3. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 2, characterized in that: The adjusting plate (10) has an arc-shaped through hole (13) in the middle, and the connecting seat (11) is clamped on the arc-shaped through hole (13).

4. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 2, characterized in that: The compressed air pipe (12) has a pipe body (14), and a conical air nozzle (15) is provided at one end of the pipe body (14) near the first welding gun (4) or the second welding gun (5). A hose (16) is provided at one end of the pipe body (14) away from the conical air nozzle (15), and an air supply pump is provided at one end of the hose (16) away from the pipe body (14).

5. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 4, characterized in that: The hose (16) is equipped with a solenoid valve, which is electrically connected to a PLC system for controlling the opening and closing of the solenoid valve and the timing.

6. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 4, characterized in that: Both the tube body (14) and the conical air nozzle (15) are made of copper or brass.

7. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 1, characterized in that: Both the first automatic welding machine (1) and the second automatic welding machine (2) have a first bottom beam (17) and a second bottom beam (18). The first bottom beam (17) and the second bottom beam (18) are parallel to each other and spaced apart. A welding gun control mechanism (19) and a pipe fixing mechanism (20) are fixedly connected between the top surfaces of the first bottom beam (17) and the second bottom beam (18).

8. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 7, characterized in that: The welding torch control mechanism (19) has a first support column (21) and a second support column (22). The first support column (21) is vertically fixedly connected to the top surface of the first bottom beam (17), and the second support column (22) is vertically fixedly connected to the top surface of the second bottom beam (18). A track (23) is fixedly connected between the top surfaces of the first support column (21) and the second support column (22). An automatically sliding clamping seat (24) is clamped on the track (23). A vertical seat (25) is vertically fixedly connected to one end of the clamping seat (24) near the pipe fixing mechanism (20). A slider (26) is slidably connected to one side of the vertical seat (25) near the pipe fixing mechanism (20). The slider (26) slides along the vertical seat (25). The clamp (6) is fixedly connected to the side of the slider (26) away from the vertical seat (25). The welding torch control mechanism (19) is electrically connected to the operation control box (3).

9. The weld cooling device for an automatic welding machine for LNG pipelines according to claim 7, characterized in that: The pipe fixing mechanism (20) has a support platform (27). A spindle box (28) for clamping the pipe and a jack (29) for adjusting the height are respectively provided on the central axis of the top surface of the support platform (27). The spindle box (28) and the jack (29) are both adjustablely and fixedly connected to the top surface of the support platform (27). The spindle box (28) has a clamp (30) at one end near the jack (29), and the top of the jack (29) has a limiting clamp (31); The pipe fixing mechanism (20) is electrically connected to the operation control box (3).

10. The weld cooling device of an automatic welding machine for LNG pipelines according to claim 9, characterized in that: A controller (32) for controlling the opening and closing of the gripper (30) is provided on one side of the spindle box (28).

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