Automatic welding device for gas pipeline

Abstract

The present invention discloses an automatic welding device for a gas pipeline, which relates to the technical field related to pipeline welding, and comprises a support frame and a welding gun arranged on the support frame. The welding gun moves circumferentially on the support frame under the drive of a driving member, and performs welding processing on the ends of two sections of gas pipelines. The device also comprises a guide plate slidably arranged circumferentially on the support frame. The driving member drives the welding gun to move circumferentially and drives the guide plate to move at the same time. During the welding stroke of the welding gun, the guide plate guides the flame generated by the combustion of the gas to other positions. By arranging the guide plate, the present invention can guide the flame of the combustion of the gas in front of the moving path of the welding gun to other positions during the welding process of the welding gun, so that the welding gun can be basically not affected by the combustion of the flame, and the welding equipment is prevented from suffering heat loss, thereby ensuring the smooth progress of the welding operation.

Description

Technical Field

[0001] The invention relates to the technical field related to pipeline welding, and in particular to an automatic welding device for a gas pipeline. Background Art

[0002] As is known, pipeline welding is the process of connecting two or more pipelines together. It is used in the pipeline system of the natural gas industry. Welding can be achieved through a variety of methods. Common welding processes include: arc welding, TIG welding, MIG welding and submerged arc welding. Detailed preparation work is required before welding, including cleaning the pipeline surface, determining the welding sequence, selecting appropriate welding materials, etc. Inspection and testing are also required after welding to ensure the strength and sealing of the welded joint.

[0003] For example, the patent with announcement number CN212443994U and announcement date February 2, 2021, and named "A Pipeline Welding Device for Gas Transmission", includes a frame, a plurality of legs are evenly arranged at the bottom end of the frame, and guide rails are symmetrically arranged in the middle of the top wall of the inner cavity of the frame, and a lead screw is arranged between the two guide rails, and a movable seat matching the guide rails is sleeved on the lead screw, and the bottom end of the movable seat is fixedly connected to the welding gun body, and grab frames are symmetrically arranged on the left and right sides of the inner cavity of the frame, and an electric telescopic device is symmetrically arranged on the top of the grab frame, and the movable end of the first telescopic rod on the electric telescopic device is fixedly connected to the top of the grab frame, and a rotating bracket mechanism is symmetrically arranged on the front and rear walls of the inner cavity of the grab frame; during the entire welding process, the gas transmission pipeline rotates under the action of the rotating bracket mechanism, and the welding work of the gas transmission pipeline can be completed by cooperating with the fixed-point welding gun body, and the welding work intensity is greatly reduced, the operation is very convenient, and the welding work can be completed quickly; and the welding work has low requirements on the quality of workers.

[0004] The disadvantage of the prior art is that when welding a pipe carrying gas, the gas is easily ignited due to gas leakage at the joint during welding. Although the heat generated by the combustion of the gas can preheat the welded end of the pipe, the flame generated by the combustion is not guided, which can easily cause thermal damage to the welding equipment, resulting in construction inconvenience. Summary of the invention

[0005] The purpose of the present invention is to provide a gas pipeline automatic welding device to solve the technical problems in the related art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A gas pipeline automatic welding device comprises a support frame and a welding gun arranged on the support frame. The welding gun moves circumferentially on the support frame under the drive of a driving member to perform welding processing on the ends of two sections of gas pipelines. The device also comprises a guide plate slidably arranged circumferentially on the support frame. The driving member drives the welding gun to move circumferentially and drives the guide plate to move at the same time. During the welding stroke of the welding gun, the guide plate guides the flame generated by the combustion of the gas away from the welding gun.

[0008] As mentioned above, a plurality of abutment rods are sequentially arranged in the circumferential direction of the support frame, and each abutment rod is slidably arranged on the support frame. In the sliding direction, a third elastic member is provided between the abutment rod and the support frame. Under the elastic force of the third elastic member, the plurality of abutment rods abut against the outer wall of the pipe.

[0009] As mentioned above, the number of the guide plates is two, and they are symmetrically arranged on the support frame with the welding gun as the symmetry axis.

[0010] As mentioned above, the guide plate includes a rod portion slidably connected to the support frame and a first guide portion swingably arranged on the rod portion, and a first elastic member is provided between the rod portion and the first guide portion. The angle of the guide flame of the first guide portion changes based on the pressure of the gas ejected from the two sections of the pipeline.

[0011] As mentioned above, the guide plate is provided with a guide groove, and the guide groove guides the flame to the moving path of the welding gun.

[0012] The above also includes a plate body that is attached to the outer wall of the joint between the two sections of the pipe, and a welding hole for the welding gun to pass through is opened in the middle of the plate body. Two baffles are provided on the plate body, and each baffle corresponds to a guide plate. During the welding stroke, the plate body moves circumferentially on the pipe based on the action of the guide plate pushing the corresponding baffle.

[0013] As mentioned above, the guide groove connects the welding area with the gas combustion area.

[0014] As mentioned above, the guide plate also includes a second guide portion, and a space for the welding gun to pass through is reserved between the two second guide portions. The second guide portion is located at one end of the first guide portion close to the pipeline. During the process in which the first guide portion guides the flame of the gas combustion, the second guide portion guides the welding fume to the guide groove.

[0015] As mentioned above, a second elastic member is provided between the second guide portion and the plate body. When the angle of the guide flame of the first guide portion increases due to the pressure of the gas ejected from the pipeline, the second guide portion applies pressure to the plate body through the second elastic member.

[0016] As mentioned above, the plate body is composed of two parts that move relative to each other. When the two parts move away from each other, the size of the weld hole becomes smaller, and the second elastic member is in sliding contact with the corresponding part of the plate body.

[0017] The beneficial effect of the present invention is that by setting a guide plate, the flame of the gas burning in front of the moving path of the welding gun can be guided to other positions during the welding process, so that the welding gun can be basically unaffected by the flame burning, avoiding heat loss of the welding equipment, thereby ensuring the smooth progress of the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a gas pipeline automatic welding device provided in an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the three-dimensional structure of a support frame of a gas pipeline automatic welding device provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the planar structure of a guide plate of a gas pipeline automatic welding device provided in an embodiment of the present invention when in operation;

[0022] Figure 4 It is a schematic cross-sectional structure diagram of a locking mechanism of a gas pipeline automatic welding device provided in an embodiment of the present invention;

[0023] Figure 5 It is a schematic cross-sectional structure diagram of a locking mechanism of a gas pipeline automatic welding device provided in an embodiment of the present invention when an extrusion block and a locking strip cooperate with each other;

[0024] Figure 6 It is a schematic cross-sectional structure diagram of two hook-shaped plugs in a locking mechanism of a gas pipeline automatic welding device provided in an embodiment of the present invention when they are matched;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of a gas pipeline automatic welding device provided in an embodiment of the present invention when two parts of the plate body are not separated from each other;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of a gas pipeline automatic welding device provided in an embodiment of the present invention when two parts of the plate body are away from each other.

[0027] Description of reference numerals:

[0028] 1. Support frame; 10. Slide; 11. Sliding block; 12. Abutment rod; 13. Main section; 14. Sub-section; 15. Locking strip; 16. Locking thread; 17. Hook plug; 18. Extrusion block; 19. Handle; 2. Welding gun; 20. Support; 3. Guide plate; 30. Rod; 31. First guide part; 32. Guide groove; 33. Second guide part; 34. Adjustment groove; 35. Adjustment block; 36. Adjustment screw; 4. Plate body; 40. Welding hole; 41. Baffle; 5. Pipeline. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, Figure 1 To Attachment Figure 8 The present invention is further described in detail.

[0030] An embodiment of the present invention provides an automatic welding device for a gas pipeline, comprising a support frame 1 and a welding gun 2 arranged on the support frame 1. The welding gun 2 moves circumferentially on the support frame 1 under the drive of a driving member to perform welding processing on the ends of two sections of a gas pipeline 5. The device also comprises a guide plate 3 slidably arranged circumferentially on the support frame 1. The driving member drives the welding gun 2 to move circumferentially while driving the guide plate 3 to move. During the welding stroke of the welding gun 2, the guide plate 3 guides the flame generated by the combustion of the gas away from the welding gun 2.

[0031] Specifically, the support frame 1 is an annular structure and is composed of two annular bodies. The two annular bodies are respectively sleeved on two gas pipelines 5. A support 20 is provided between the two annular bodies for installing welding equipment. The welding equipment is a prior art and will not be described in detail here. Each annular body is provided with a slideway 10 for the support 20 to slide. The driving member can drive the support 20 to move circumferentially in the slideway 10. The driving member can be a driving motor, a driving gear arranged at the power output end of the driving motor, and an annular rack arranged in the slideway 10. The gear is meshed with the rack. When the driving motor is working, the gear cooperates with the annular rack to realize the movement of the support 20. In this way, the automatic welding of the two sections of the gas pipeline 5 can be realized. However, in the prior art, some conventional The gas pipeline 5 needs to be welded with gas, and the sparks generated by the welding gun 2 when in use will ignite the gas discharged from the joints at the ends of the two sections of the pipeline 5. In order to avoid fire accidents caused by gas combustion and affect the welding operation, the gas pressure in the pipeline 5 will be reduced to 100-300Pa during the welding operation, that is, it will not affect the gas transportation and will not affect the welding operation. The heat generated by the gas combustion can be used to preheat the end of the pipeline 5 that needs to be welded. Preheating can reduce the temperature gradient between the weldment and the weld, slow down the cooling rate of the welded joint, and reduce the stress and hardened structure caused by the temperature difference. However, there is still a problem, that is, the flame generated by the combustion is not guided, which is easy to cause thermal damage to the welding equipment, causing construction inconvenience.

[0032] Therefore, in this embodiment, a slider 11 is also slidably provided in each slideway 10, and a guide plate 3 is arranged between the two sliders 11 on the two annular bodies. When the driving member drives the welding gun 2 to move circumferentially along the pipeline 5, the driving member can also drive the guide plate 3 to move circumferentially along the pipeline 5 through the slider 11. For example, when welding the joints of two sections of the pipeline 5 in a clockwise direction, the guide plate 3 also moves in the clockwise direction, and in the clockwise direction, the guide plate 3 is in front of the welding gun 2, that is, the guide plate 3 can guide the flame of the gas combustion to other positions in advance, and the welding gun 2 can basically not contact the flame during welding, thereby protecting the welding equipment.

[0033] The beneficial effect of the present invention is that by setting the guide plate 3, the flame of the gas combustion in front of the moving path of the welding gun 2 can be guided to other positions during the welding process of the welding gun 2, so that the welding gun 2 can be basically unaffected by the flame combustion, avoiding heat loss of the welding equipment, thereby ensuring the smooth progress of the welding operation.

[0034] Preferably, a plurality of abutment rods 12 are sequentially arranged in the circumferential direction of the support frame 1, and each abutment rod 12 is slidably arranged on the support frame 1. In the sliding direction, a third elastic member is provided between the abutment rod 12 and the support frame 1. Under the elastic force of the third elastic member, the plurality of abutment rods 12 abut against the outer wall of the pipe 5.

[0035] Specifically, in order to adapt to welding of pipes 5 with more different radial sizes, the connection between the support frame 1 and the pipe 5 should be adapted accordingly, that is, in the present embodiment, each annular body of the support frame 1 is divided into three sections, namely a main section 13 and two sub-sections 14, the main section 13 is used to connect the two sub-sections 14, and the main section 13 and the sub-section 14 are connected by a hinge, and the two sub-sections 14 are connected by a locking mechanism, and each sub-section 14 is arranged with a plurality of abutment rods 12, and the length direction of the abutment rods 12 is parallel to a certain radial direction of the sub-section 14. After the annular body is sleeved on the pipe 5, the two sub-sections 14 are connected, and under the elastic force of the third elastic member, the abutment rod 12 can abut against the outer wall of the pipe 5, so that the installation of the support frame 1 can be completed, and for pipes 5 with different radial sizes, under the elastic force of the third elastic member, the abutment rod 12 can also abut against the outer wall of the pipe 5.

[0036] The locking mechanism includes a locking strip 15 slidably arranged along the axial direction in each sub-section 14, and in the sliding direction, a fourth elastic member is provided between each locking strip 15 and the corresponding sub-section 14, and a locking thread 16 is arranged on the surface of each abutting rod 12. Under the elastic force of the fourth elastic member, the locking strip 15 tends to be plugged into the locking thread 16, and a hook plug 17 is provided at one end of the locking strip 15. When the two sub-sections 14 are connected, the two hook plugs 17 firstly wedge-fit to form an extrusion action to squeeze the fourth elastic member, and then the two hook plugs 17 are plugged into each other along the axial direction, so that the two sub-sections 14 can no longer be separated, and the locking strip 15 is plugged into the corresponding locking thread 16, and at the same time, the sliding of the abutting rod 12 on the corresponding sub-section 14 is restricted, so that the support frame 1 is stably installed on the pipe 5, wherein each main section A handle 19 is slidably provided on 13, and an extrusion block 18 is arranged on the handle 19, which is opposite to each locking strip 15. The wedge-shaped cooperation between the extrusion block 18 and the locking strip 15 forms an extrusion action, that is, under normal circumstances, based on the elastic force of the fourth elastic member, the wedge-shaped structure on the locking strip 15 squeezes the wedge-shaped structure of the extrusion block 18. When the two hook plugs 17 need to be unlocked, the handle 19 can be pulled, and the handle 19 drives the extrusion block 18 to squeeze the locking strip 15 in turn, so that the locking strip 15 squeezes the fourth elastic member until the plane on the extrusion block 18 abuts against the plane on the locking strip 15, and there is no longer a force offset between the two along the moving direction of the extrusion block 18. The two hook plugs 17 are disengaged along the axial direction, and the connection lock of the two sub-sections 14 is removed, so that the support frame 1 can be removed from the pipeline 5.

[0037] Preferably, the number of the guide plates 3 is two, and they are symmetrically arranged on the support frame 1 with the welding gun 2 as the axis of symmetry; specifically, in the initial stage of welding, the gas will leak and burn from any position of the joint of the two sections of the pipe 5. Therefore, in the aforementioned embodiment, the gas discharged from the joints close to the welding gun 2 except the guide plates 3 still contacts the welding equipment. Therefore, the number of guide plates 3 is set to two, and they are symmetrically arranged on both sides of the welding gun 2. Then, there are guide plates 3 at the joints on both sides of the welding gun 2 to guide the flame of the gas combustion to other positions, so as to better protect the welding equipment. The positions of the two guide plates 3 are symmetrically arranged. Then, during the welding operation, the welding gun 2 can freely choose whether to operate clockwise or counterclockwise.

[0038] Furthermore, the guide plate 3 includes a rod portion 30 slidably connected to the support frame 1 and a first guide portion 31 swingably arranged on the rod portion 30, and a first elastic member is provided between the rod portion 30 and the first guide portion 31, and the angle of the guide flame of the first guide portion 31 changes based on the pressure of the gas ejected from the two sections of the pipeline 5.

[0039] Specifically, the two ends of the rod 30 are respectively fixed with a slider 11, and the position where the first guide portion 31 is connected to the rod 30 is close to one of its ends, that is, one end of the first guide portion 31 is close to the outer wall of the pipe 5, and the other end is far away from the outer wall of the pipe 5. The length direction of the first guide portion 31 is basically parallel to a certain tangent direction of the pipe 5, and the connection between the rod 30 and the first guide portion 31 is closer to the outer wall of the pipe 5. Under the elastic force of the first elastic member, the length direction of the first guide portion 31 is parallel to a certain tangent direction of the pipe 5 in its initial state. As the length of the weld is gradually lengthened, the gap between the two sections of the pipe 5 is gradually shortened, and the pressure of the gas exhaust also increases accordingly. Therefore, the first guide portion 31 is The end of the first guide portion 31 close to the pipeline 5 should be closer to the outer wall of the pipeline 5, so that the angle between the first guide portion 31 and the outer wall of the pipeline 5 becomes larger, the space for gas exhaust and combustion becomes larger, and the pressure decreases accordingly. Since the first guide portion 31 has a guiding effect, the flame flows and burns in the direction away from the pipeline 5 along the inclined direction of the first guide portion 31, and a negative pressure is formed between one end of the first guide portion 31 and the outer wall of the pipeline 5, that is, a suction effect is formed on the area where the welding gun 2 is located, so that the smoke generated by welding and the flying impurities can be extracted from the welding gun 2, thereby improving the welding efficiency, and some of the incompletely burned gases and impurities can reduce the pollution to the environment after secondary combustion.

[0040] Each slider 11 is provided with an adjustment groove 34, in which an adjustment block 35 is slidably provided, and the rod portion 30 is fixedly connected to the adjustment block 35. The position of the adjustment block 35 in the adjustment groove 34 is controlled by the adjustment screw 36. That is, according to different radial dimensions of the pipeline 5, the distance between the guide plate 3 and the outer wall of the pipeline 5 can be controlled by rotating the adjustment screw 36, so that a better diversion effect can be obtained.

[0041] Preferably, a guide groove 32 is provided on the guide plate 3, and the guide groove 32 guides the flame to the moving path of the welding gun 2; specifically, the first guide portion 31 is relatively dispersed in guiding the flame generated by gas combustion. Therefore, in this embodiment, a guide groove 32 is provided on the side of the first guide portion 31 facing the outer wall of the pipeline 5 along the length direction of the first guide portion 31. The guide groove 32 can better guide the flow of gas, so that the flame of the gas combustion can more accurately heat the joint of the two sections of the pipeline 5. In order to better guide the flow, the width of the guide groove 32 can be designed to be narrower, and a plurality of guide grooves are arranged, and each guide groove 32 connects the welding area with the gas combustion area, so that the welding waste gas and impurities can be better guided into the gas combustion area.

[0042] Furthermore, it also includes a plate body 4 that is attached to the outer wall of the joint of the two sections of the pipeline 5. A welding hole 40 for the welding gun 2 to pass through is opened in the middle of the plate body 4. Two baffles 41 are provided on the plate body 4, and each baffle 41 corresponds to a guide plate 3. During the welding stroke, the plate body 4 moves circumferentially on the pipeline 5 based on the action of the guide plate 3 pushing the corresponding baffle 41.

[0043] Specifically, the plate body 4 is independently arranged, and the welding hole 40 on it corresponds to the joint of the two sections of the pipe 5. During the welding operation, the end of the welding gun 2 can be welded to the joint through the welding hole 40. Except for the welding hole 40, the rest of the plate body 4 can shield the joint that is not welded but close to the welding gun 2, and can also maintain the pressure of the weld that has just been welded to prevent the pressure in the pipe 5 from pushing the metal at the joint of the two sections of the pipe 5 that has not been completely solidified outward, resulting in a poor welding effect. In the welding process, the first guide The guide portion 31 is affected by the gas pressure, and one end thereof will contact the corresponding baffle 41. During the circumferential movement of the guide plate 3, the first guide portion 31 will drive the plate body 4 to move together, wherein the baffle 41 will not affect the guide groove 32, and the angle between the baffle 41 and the plate body 4 is basically a right angle. Then, when the welding waste gas and impurities are sucked under negative pressure, the baffle 41 can directly guide the waste gas and impurities to the guide groove 32, and some heavier impurities are blocked after hitting the baffle 41, thereby preventing some particulate impurities from being discharged into the atmosphere with the flue gas.

[0044] Furthermore, the guide plate 3 also includes a second guide portion 33, and a space for the welding gun 2 to pass through is reserved between the two second guide portions 33. The second guide portion 33 is located at one end of the first guide portion 31 close to the pipe 5. During the process in which the first guide portion 31 guides the flame of the gas combustion, the second guide portion 33 guides the welding fume to the guide groove 32.

[0045] Specifically, the second guide portion 33 and the plate body 4 are in a trumpet shape, and the first guide portion 31 and the outer wall of the pipe 5 are also basically in a trumpet shape. The size of the first guide portion 31 is larger than that of the second guide portion 33. In this way, the narrowest position is formed between the baffle 41 and the first guide portion 31, and the guide groove 32 becomes a channel for welding waste gas and impurities, thus forming the principle of a Venturi tube (this is not repeated in the prior art), thereby achieving a better secondary combustion treatment effect on welding waste gas and impurities.

[0046] Preferably, a second elastic member is provided between the second guide portion 33 and the plate body 4. When the angle of the guide flame of the first guide portion 31 increases due to the pressure of the gas ejected from the pipeline 5, the second guide portion 33 applies pressure to the plate body 4 through the second elastic member.

[0047] Specifically, as the weld gradually lengthens, the gas pressure in the pipeline 5 also increases, and the welding operation at the joint of the two sections of the pipeline 5 should be slowed down to improve the welding effect. Therefore, in this embodiment, a second elastic member is arranged between the second guide portion 33 and the plate body 4, that is, as the pressure of the gas discharge on the first guide portion 31 gradually increases, the second guide portion 33 will squeeze the second elastic member, and the second elastic member will exert an extrusion effect on the plate body 4, the pressure between the plate body 4 and the outer wall of the pipeline 5 becomes larger, and the friction effect becomes gradually obvious. In this way, the friction effect between the plate body 4 and the outer wall of the pipeline 5 can be used to slow down the speed at which the driving member drives the welding gun 2 to move.

[0048] Furthermore, the plate body 4 includes two parts that move relative to each other. When the two parts are separated from each other, the size of the weld hole becomes smaller, and the second elastic member is in sliding contact with the corresponding part of the plate body 4. Specifically, the two parts of the plate body 4 are both L-shaped, but the two are arranged 180 degrees centrally symmetrically. As the weld gradually becomes longer, the gas pressure in the pipeline 5 increases. Especially when the welding is about to be completed, the pressure of the gas based on the first guide part 31 is basically close to the maximum force. In order to avoid the pressure causing the two sections of the pipeline 5 to be unable to be welded firmly, in this embodiment, the welding hole 40 is reduced, and the weld after welding is pressurized in advance to reduce the pressure effect, thereby achieving a better welding effect.

[0049] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the protection of the present invention.

Claims

1. An automatic gas pipeline welding device, comprising a support frame and a welding gun arranged on the support frame, wherein the welding gun moves circumferentially on the support frame under the drive of a driving member to perform welding processing on the ends of two sections of gas pipelines, characterized in that: It also includes a guide plate slidably arranged in the circumferential direction on the support frame, wherein the driving member drives the welding gun to move in the circumferential direction and drives the guide plate to move at the same time, and during the welding stroke of the welding gun, the guide plate guides the flame generated by the combustion of the gas away from the welding gun; The number of the guide plates is two, and they are symmetrically arranged on the support frame with the welding gun as the symmetry axis; The guide plate includes a rod portion slidably connected to the support frame and a first guide portion swingably arranged on the rod portion, and a first elastic member is provided between the rod portion and the first guide portion, and the angle of the guide flame of the first guide portion changes based on the pressure of the gas ejected from the two pipe sections; A slider is fixedly connected to each of the two ends of the rod, and the position where the first guide part is connected to the rod is close to one of its ends; each slider is provided with an adjustment slot, an adjustment block is slidably arranged in the adjustment slot, the rod is fixedly connected to the adjustment block, and the position of the adjustment block in the adjustment slot is controlled by an adjustment screw; The guide plate is provided with a guide groove, and the guide groove guides the flame to the moving path of the welding gun; It also includes a plate body attached to the outer wall of the joint of two sections of the pipeline, a welding hole for the welding gun to pass through is opened in the middle of the plate body, two baffles are arranged on the plate body, each baffle corresponds to a guide plate, and during the welding stroke, the plate body moves circumferentially on the pipeline based on the action of the guide plate pushing the corresponding baffle; The guide groove connects the welding area with the gas combustion area.

2. The automatic welding device for gas pipeline according to claim 1 is characterized in that: A plurality of abutment rods are sequentially arranged in the circumferential direction of the support frame, and each abutment rod is slidably arranged on the support frame. In the sliding direction, a third elastic member is provided between the abutment rod and the support frame. Under the elastic force of the third elastic member, the plurality of abutment rods abut against the outer wall of the pipe.

3. The automatic welding device for gas pipeline according to claim 1 is characterized in that: The guide plate also includes a second guide portion, and a space for the welding gun to pass through is reserved between the two second guide portions. The second guide portion is located at one end of the first guide portion close to the pipeline. During the process in which the first guide portion guides the flame of the gas combustion, the second guide portion guides the welding fume to the guide groove.

4. The automatic welding device for gas pipeline according to claim 3 is characterized in that: A second elastic member is provided between the second guide portion and the plate body. When the angle of the guide flame of the first guide portion increases due to the pressure of the gas ejected from the pipeline, the second guide portion applies pressure to the plate body through the second elastic member.

5. The automatic welding device for gas pipeline according to claim 4 is characterized in that: The plate body comprises two parts that move relative to each other. When the two parts move away from each other, the size of the weld hole becomes smaller, and the second elastic member is in sliding contact with the corresponding part of the plate body.

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