Large-diameter automatic welding device and welding process

Abstract

The invention relates to the technical field of pipeline external welding machines, and provides a large-diameter automatic welding device and a welding process, the large-diameter automatic welding device is used for welding a large-diameter pipeline, the large-diameter automatic welding device comprises an external welding machine and a moving mechanism, the external welding machine slides on the outer wall of the large-diameter pipeline through the moving mechanism, the moving mechanism comprises a moving seat and a sealing ring, and the sealing ring is arranged on the bottom surface of the moving seat; the surface, away from the bottom face of the movable base, of the sealing ring can abut against the outer wall of the large-diameter pipeline, and after the sealing ring abuts against the outer wall of the large-diameter pipeline, the middle of the sealing ring and the middle of the movable base jointly form a cavity. And the negative pressure generating piece is arranged on the moving seat, is positioned above the cavity, and is used for pumping out gas in the cavity, so that a negative pressure space is formed in the cavity. According to the technical scheme, the technical problem that the single-gun automatic external welding machine cannot freely weld different welding positions due to the fact that the moving direction of the single-gun automatic external welding machine is seriously limited by a steel plate guide rail in the related technology / the prior art is solved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of pipeline external welding machines, and in particular, to a large-caliber automatic welding device and a welding process. Background Art

[0002] At present, the pipeline full-position automatic welding machine is divided into single-gun automatic external welding machine and double-gun automatic external welding machine. Among them, before using the single-gun automatic external welding machine, it is necessary to perform manual argon arc welding on the welding port of the large-diameter pipeline, and then lay a circular steel plate track on the large-diameter pipeline, and put the single-gun automatic external welding machine on the steel plate track, and realize automatic welding by automatically moving the single-gun automatic external welding machine along the steel plate track.

[0003] However, the steel plate rails used in existing single-gun automatic external welding machines have great limitations. The existing steel plate rails can only be arranged along the circumferential direction of the pipe, resulting in a relatively fixed welding position for the single-gun automatic external welding machine. If the position where the large-diameter pipe needs to be welded is wavy or has a large bend, the steel plate rail is no longer applicable. Therefore, the existing steel plate rails severely limit the moving direction of the single-gun automatic external welding machine, resulting in the single-gun automatic external welding machine being unable to achieve free welding of different welding positions. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the embodiments of the present invention provide a large-caliber automatic welding device and welding process, which solves the technical problem that the existing steel plate guide rails in the related technology / existing technology seriously limit the moving direction of the single-gun automatic external welding machine, resulting in the single-gun automatic external welding machine being unable to achieve free welding of different welding positions.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a large-diameter automatic welding device for welding large-diameter pipes, comprising an external welder and a moving mechanism, wherein the external welder slides on the outer wall of the large-diameter pipe through the moving mechanism, and the moving mechanism comprises: Mobile seat; A sealing ring, wherein the sealing ring is arranged on the bottom surface of the movable seat, and the surface of the sealing ring away from the bottom surface of the movable seat can abut against the outer wall of the large-diameter pipe. After the sealing ring abuts against the outer wall of the large-diameter pipe, the middle part of the sealing ring and the middle part of the movable seat jointly form a cavity; A negative pressure generating component is arranged on the movable seat, the negative pressure generating component is located above the cavity, and the negative pressure generating component is used to extract the gas in the cavity so that the cavity forms a negative pressure space.

[0006] Optionally, the movable seat has wheels, and the vertical distance from the sealing ring to the large-diameter pipe is greater than the vertical distance from the wheels to the large-diameter pipe.

[0007] Optionally, the moving mechanism further includes: A driver is arranged on the moving seat, the driver is drivingly connected to the wheel, and the driver is used to drive the wheel to rotate.

[0008] Optionally, the moving mechanism further includes: A water storage box, arranged on the movable seat; There are several water spray heads, which are all arranged on the movable seat and located in the cavity. The several water spray heads are connected to the water storage box. After the water spray heads are used to spray water into the cavity, the bottom surface of the sealing ring contacts with water and forms a water film.

[0009] Optionally, the movable seat has an opening, the opening is located above the cavity and communicates with the cavity, and the movable mechanism further includes: A top cover is arranged on the movable seat, the top cover covers the opening, the top cover has a through hole, and the negative pressure generating member is connected to the through hole.

[0010] Optionally, the moving mechanism further includes: There are several rotating brush bodies, which are arranged on the movable seat. Each rotating brush body is rotatably arranged between two adjacent water spray heads. After the water spray heads spray water, the rotating brush bodies are used to throw the water flow to the connection between the sealing ring and the large-diameter pipe.

[0011] Optionally, the moving mechanism further includes: At least two positioning ropes are provided, the positioning ropes are wound around the outer wall of the large-diameter pipe, and the positioning ropes are used as the moving path of the moving seat; There are several connecting blocks, which are arranged on the bottom surface of the moving seat, each positioning rope is passed through at least two connecting blocks, and the connecting blocks are slidably arranged on the positioning ropes.

[0012] Optionally, the movable seat is provided with a plurality of connection ends, and the movable seat is arranged on the bottom surface of the external welding machine through the connection ends.

[0013] A welding process for a large-diameter pipe comprises the following steps: S1. Wrap the positioning rope around the outer wall of the large-diameter pipe; S2, then installing the movable seat on the positioning rope, and fitting the sealing ring below the movable seat to the outer wall of the large-diameter pipe; S3. Start the negative pressure generating part, the cavity forms a sealed space, and the moving seat is adsorbed on the outer wall of the large-diameter pipe. S4. Start the external welding machine, and the moving seat drives the external welding machine to move along the welding direction.

[0014] Optionally, the specific steps of S1 are: S101. Arrange a positioning rope according to the welding position of the large-diameter pipeline so that the positioning rope is parallel to the edge of the welding position.

[0015] The beneficial effects of the embodiments of the present disclosure are: When the automatic welding device for large-diameter pipes disclosed in the present invention is working, it is only necessary to place the moving mechanism on the outer wall of the large-diameter pipe to ensure that the sealing ring is fully fitted with the outer wall of the pipe. Start the vacuum pump, for example, the vacuum pump quickly extracts the air in the cavity, so that the cavity quickly forms a negative pressure space. Under the action of negative pressure, the moving seat is tightly adsorbed on the outer wall of the pipe. At this time, under the movement of the moving seat, the external welding machine can flexibly move on the pipe with the help of the moving mechanism to carry out welding operations, and there are not many restrictions on the welding position of the external welding machine.

[0016] Compared with the traditional single-gun automatic external welding machine using steel plate tracks, this device greatly improves the flexibility of welding. Since there is no need to lay steel plate tracks, the external welding machine can easily reach the welding position and move along the edge parallel to the welding position, whether it is facing a pipe with a wavy weld or a pipe with a large degree of curvature. This not only expands the scope of application of welding, but also reduces the difficulty and cost of preliminary preparation work. At the same time, the moving seat is adsorbed on the pipe through negative pressure. Compared with track-type movement, it can better adapt to the unevenness of the pipe surface, ensure the stability of the welding process, and thus improve the welding quality and reduce the occurrence of welding defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the positional relationship between a large-diameter pipeline and an external welding machine in one embodiment of the present disclosure; Figure 2 for Figure 1 Schematic diagram of the structure of the moving mechanism in the embodiment; Figure 3 for Figure 1 Schematic diagram of the bottom structure of the moving mechanism in the embodiment; Figure 4 for Figure 1 Schematic diagram of the internal structure of the moving mechanism in the embodiment; Figure 5 for Figure 1 A schematic diagram of the structure after the internal and external welding machines and the moving mechanism are connected in the embodiment; Figure 6 for Figure 1 Schematic diagram of the sealing ring structure in the embodiment.

[0019] In the figure: 100, large-diameter pipe; 200, external welding machine; 300, moving mechanism; 1, moving seat; 2, sealing ring; 201, round hole; 202, long groove; 3, negative pressure generating part; 101, cavity; 4, wheel; 5, drive; 6, water storage box; 7, sprinkler head; 1011, opening; 8, top cover; 801, through hole; 9, rotating brush body; 10, positioning rope; 11, connecting block; 12, connecting end. DETAILED DESCRIPTION The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0020] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0021] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0022] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0024] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] like Figure 1 to Figure 6 As shown, it shows a large-diameter automatic welding device in one embodiment of the present disclosure, which is used for welding a large-diameter pipe 100, including an external welder 200 and a moving mechanism 300. The external welder 200 slides on the outer wall of the large-diameter pipe 100 through the moving mechanism 300. The moving mechanism 300 includes a moving seat 1 and a sealing ring 2. The sealing ring 2 is arranged on the bottom surface of the moving seat 1. The surface of the sealing ring 2 away from the bottom surface of the moving seat 1 can abut against the outer wall of the large-diameter pipe 100. After the sealing ring 2 abuts against the outer wall of the large-diameter pipe 100, the middle part of the sealing ring 2 and the middle part of the moving seat 1 jointly form a cavity 101; a negative pressure generating component 3 is arranged on the moving seat 1, and the negative pressure generating component 3 is located above the cavity 101. The negative pressure generating component 3 is used to extract the gas in the cavity 101 so that the cavity 101 forms a negative pressure space.

[0026] For example, Figure 1 and Figure 2 As shown, the large-diameter automatic welding device is mainly composed of an external welding machine 200 and a moving mechanism 300. The moving seat 1 in the moving mechanism 300 is made of aluminum alloy, which not only ensures the structural strength but also reduces the overall weight. The moving seat 1 is easy to install and operate. The sealing ring 2 is made of a flexible and extremely sealing rubber material and is installed on the bottom surface of the moving seat 1. When the sealing ring 2 contacts the outer wall of the large-diameter pipe 100, the sealing ring 2 and the middle part of the moving seat 1 jointly enclose a cavity 101. The negative pressure generating part 3 uses a silent vacuum pump, which is firmly installed above the moving seat 1 and is closely connected to the cavity 101.

[0027] When working, it is only necessary to place the moving mechanism 300 on the outer wall of the large-diameter pipe 100 to ensure that the sealing ring 2 is fully fitted with the outer wall of the pipe. Taking the vacuum pump as an example, start the vacuum pump, and the vacuum pump quickly extracts the air in the cavity 101, so that the cavity 101 quickly forms a negative pressure space. Under the action of negative pressure, the moving seat 1 is tightly adsorbed on the outer wall of the pipe. At this time, under the movement of the moving seat 1, the external welder 200 can move flexibly on the pipe with the help of the moving mechanism 300 to carry out welding operations. There are no many restrictions on the welding position of the external welder 200.

[0028] Compared with the traditional single-gun automatic external welding machine 200 using steel plate tracks, this device greatly improves the flexibility of welding. Since there is no need to lay steel plate tracks, whether it is facing a pipe with a wavy weld or a pipe with a large degree of curvature, the external welding machine 200 can easily reach the welding position and move along the edge parallel to the welding position. This not only expands the scope of application of welding, but also reduces the difficulty and cost of preliminary preparation work. At the same time, the movable seat 1 is adsorbed on the pipeline through negative pressure. Compared with track-type movement, it can better adapt to the unevenness of the pipeline surface, ensure the stability of the welding process, and thus improve the welding quality and reduce the occurrence of welding defects.

[0029] In some examples, the mobile seat 1 has wheels 4, and the vertical distance between the sealing ring 2 and the large-diameter pipe 100 is greater than the vertical distance between the wheels 4 and the large-diameter pipe 100. In addition, a circular hole 201 and a long groove 202 are provided on the side wall of the sealing ring 2, and one side of the long groove 202 is connected to the cavity 101. The circular hole 201 is used to improve the adsorption capacity of the sealing ring 2, and the long groove 202 is used to improve the extrusion capacity of the sealing ring 2, so that the adsorption force can be improved.

[0030] For example, Figure 2 and Figure 3 As shown, four wheels 4 are arranged below the mobile seat 1. The vertical distance between the sealing ring 2 and the pipeline is greater than the vertical distance between the wheels 4 and the pipeline, thereby ensuring that the sealing ring 2 contacts the pipeline first and improving the sealing performance of the sealing ring 2.

[0031] When the mobile seat 1 is placed on the pipeline, the sealing ring 2 first fits against the outer wall of the pipeline, and then the negative pressure generating member 3 is activated to form negative pressure. It should be noted that when the mobile seat 1 is not completely adsorbed on the large-diameter pipeline 100, it is necessary to hold the external welding machine 200 by hand until the mobile seat 1 is completely adsorbed on the outer wall of the large-diameter pipeline 100 before letting go. When the mobile seat 1 starts to move, the wheels 4 roll on the outer wall of the pipeline. Since the sealing ring 2 has formed a good seal, the negative pressure can be stably maintained, driving the mobile seat 1 to move smoothly.

[0032] The sealing ring 2 can form an effective seal with the outer wall of the pipe in a short time. During the movement, the stable negative pressure adsorption and the rolling of the wheels 4 make the movement of the moving base 1 more stable, reduce the instability of the adsorption force caused by poor sealing, and thus improve the stability of the movement of the external welding machine 200, effectively improving the welding quality.

[0033] In some examples, the moving mechanism 300 further includes a driver 5 , which is disposed on the moving base 1 , and is transmission-connected to the wheels 4 , and is used to drive the wheels 4 to rotate.

[0034] For example, Figure 3As shown, the driver 5 adopts a high-efficiency DC motor and a gear transmission system. The driver 5 is integrally mounted on the moving base 1 and is transmission-connected to the wheel 4 .

[0035] When the mobile seat 1 needs to move, the DC motor is turned on first, and the power of the motor is transmitted to the wheel 4 through the gear transmission system to drive the wheel 4 to rotate. The rotation of the wheel 4 drives the mobile seat 1 and the external welder 200 installed thereon to move along the outer wall of the large-diameter pipeline 100 according to the set path.

[0036] The automatic drive of the moving seat 1 is realized, and the welding efficiency is improved. The precise gear transmission system can also ensure the control of the rotation speed of the wheel 4, so that the moving speed of the external welding machine 200 is stable and adjustable, which can meet the requirements of different welding processes for welding speed, and further improve the controllability of welding quality. At the same time, the automatic drive reduces the labor intensity of workers, which is conducive to long-term and large-scale welding operations.

[0037] In some examples, the mobile mechanism 300 also includes a water storage box 6, which is disposed on the mobile seat 1; there are a plurality of water spray heads 7, which are all disposed on the mobile seat 1, and the water spray heads 7 are all located in the cavity 101, and the water spray heads 7 are all connected to the water storage box 6, and the water spray heads 7 are used to spray water into the cavity 101, and then the bottom surface of the sealing ring 2 contacts with water and forms a water film.

[0038] For example, Figure 2 As shown, a plastic water storage box 6 is installed on the mobile seat 1. The water storage box 6 is connected to a plurality of water spray heads 7 through a water pipe, and the water spray heads 7 are evenly distributed on the mobile seat 1 and are located in the cavity 101.

[0039] Before or during welding, the micro water supply pump is started, and the water in the water storage box 6 flows to the water spray head 7 through the water pipe, and is sprayed into the cavity 101 from the water spray head 7. The sprayed water quickly spreads on the bottom surface of the sealing ring 2 to form a uniform water film.

[0040] The formation of the water film significantly enhances the sealing between the sealing ring 2 and the outer wall of the pipe. On the one hand, the water film fills the tiny gap that may exist between the sealing ring 2 and the pipe, further preventing the outside air from entering the cavity 101, ensuring the stability of the negative pressure; on the other hand, the water can also absorb part of the heat near the welding position during the welding process, effectively cooling the sealing ring 2, and preventing the sealing ring 2 from overheating and causing the material performance to deteriorate. In addition, the water film can also play a certain lubricating role, reducing the friction when the moving seat 1 moves, making the movement smoother.

[0041] In some examples, the moving seat 1 has an opening 1011, which is located above the cavity 101 and connected to the cavity 101. The moving mechanism 300 also includes a top cover 8, which is arranged on the moving seat 1, and the top cover 8 covers the opening 1011. The top cover 8 has a through hole 801, and the negative pressure generating part 3 is connected to the through hole 801.

[0042] For example, the top of the mobile seat 1 is provided with an opening 1011, and the opening 1011 is directly connected to the cavity 101 below. A removable top cover 8 is installed at the opening 1011, and a through hole 801 is provided on the top cover 8. Taking a vacuum pump as an example, through the through hole 801, the liquid in the cavity 101 can flow out quickly, thereby ensuring a negative pressure environment in the cavity 101.

[0043] In some examples, the moving mechanism 300 also includes a rotating brush body 9, which has several rotating brush bodies 9, and the several rotating brush bodies 9 are all arranged on the moving seat 1. Each rotating brush body 9 is rotatably arranged between two adjacent water spray heads 7. After the water spray head 7 sprays water, the rotating brush body 9 is used to throw the water flow to the connection between the sealing ring 2 and the large-diameter pipe 100.

[0044] For example, Figure 3 and Figure 4 As shown, a plurality of rotating brush bodies 9 are installed on the movable seat 1. The rotating brush body 9 is located between two adjacent water spray heads 7, and is connected to the movable seat 1 through a bearing so as to be flexibly rotatable.

[0045] After the water spray head 7 sprays water, the motor drives the rotating brush body 9 to rotate, and the rotating brush body 9 evenly throws the water flow to the connection between the sealing ring 2 and the pipeline to ensure that the connection is fully wetted.

[0046] The setting of the rotating brush body 9 makes the water more evenly distributed at the connection between the sealing ring 2 and the pipeline, further strengthening the sealing effect of the water film. At the same time, the rotation of the rotating brush body 9 can remove dust, impurities, etc. that may exist at the connection, thereby improving the sealing performance of the sealing ring 2.

[0047] In some examples, the mobile mechanism 300 further includes a positioning rope 10, at least two of which are arranged, the positioning ropes 10 are wound around the outer wall of the large-diameter pipe 100, and the positioning ropes 10 are used as a moving path for the mobile seat 1; there are a plurality of connecting blocks 11, the connecting blocks 11 are arranged on the bottom surface of the mobile seat 1, each positioning rope 10 is passed through at least two connecting blocks 11, and the connecting blocks 11 are slidably arranged on the positioning ropes 10. The structure of the connecting blocks 11 is similar to a hinge.

[0048] For example, Figure 1 and Figure 3As shown, the moving mechanism 300 uses two high-strength fiber positioning ropes 10. The positioning ropes 10 are tightly wound around the outer wall of the large-diameter pipe 100, and a plurality of connecting blocks 11 with pulleys are installed on the bottom surface of the moving seat 1, and each positioning rope 10 passes through at least two connecting blocks 11.

[0049] According to the welding position of the pipeline, plan and arrange the positioning rope 10 in advance. Install the movable seat 1 on the positioning rope 10 through the connecting block 11. Under the action of the driver 5, the pulley on the connecting block 11 slides along the positioning rope 10, driving the movable seat 1 to move along the trajectory of the positioning rope 10. It should be noted that when the positioning rope 10 needs to deflect the moving angle, it needs to be fixed by a positioning rod at the bending position of the positioning rope 10. The positioning rod needs to be simply welded to the outer wall of the large-diameter pipe 100, or a magnet block can be used to control the bending position of the positioning rope 10. It should also be noted that when the connecting block 11 is close to the positioning rod, manual assistance is required for the connecting block 11 to pass through the positioning rod.

[0050] The positioning rope 10 provides a precise moving path for the mobile seat 1, and the operator can flexibly adjust the arrangement of the positioning rope 10 according to the complex welding position of the pipeline. The accuracy of the welding position is greatly improved, the mobile seat 1 is prevented from being offset during the movement, and the external welding machine 200 can accurately weld the target position. At the same time, the sliding cooperation between the connecting block 11 and the positioning rope 10 makes the movement of the mobile seat 1 smoother, reduces the jamming phenomenon during the movement, and improves the welding efficiency.

[0051] In some examples, a plurality of connection ends 12 are disposed on the movable base 1 , and the movable base 1 is disposed on the bottom surface of the external welding machine 200 through the connection ends 12 .

[0052] A welding process for a large-diameter pipe comprises the following steps: S1, winding the positioning rope 10 around the outer wall of the large-diameter pipe 100; S2, then install the movable seat on the positioning rope 10, and fit the sealing ring 2 below the movable seat onto the outer wall of the large-diameter pipe 100; S3, start the negative pressure generating element 3, the cavity 101 forms a sealed space, and the movable seat 1 is adsorbed on the outer wall of the large-diameter pipe 100 S4, start the external welding machine 200, and the moving base 1 drives the external welding machine 200 to move along the welding direction.

[0053] In some examples, the specific steps of S1 are: S101. Arrange the positioning rope 10 according to the welding position of the large-diameter pipe 100 so that the positioning rope 10 is parallel to the edge of the welding position.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A large-diameter automatic welding device for welding a large-diameter pipe (100), comprising an external welding machine (200) and a moving mechanism (300), wherein the external welding machine (200) slides on the outer wall of the large-diameter pipe (100) through the moving mechanism (300), characterized in that: The moving mechanism (300) comprises: Mobile seat (1); A sealing ring (2), the sealing ring (2) being arranged on the bottom surface of the movable seat (1), the surface of the sealing ring (2) away from the bottom surface of the movable seat (1) being capable of abutting against the outer wall of the large-diameter pipe (100), and after the sealing ring (2) abuts against the outer wall of the large-diameter pipe (100), the middle part of the sealing ring (2) and the middle part of the movable seat (1) jointly form a cavity (101); A negative pressure generating component (3) is arranged on the movable seat (1), the negative pressure generating component (3) is located above the cavity (101), and the negative pressure generating component (3) is used to extract gas in the cavity (101) so that the cavity (101) forms a negative pressure space.

2. A large-caliber automatic welding device according to claim 1, characterized in that: The movable seat (1) has wheels (4), and the vertical distance between the sealing ring (2) and the large-diameter pipeline (100) is greater than the vertical distance between the wheels (4) and the large-diameter pipeline (100).

3. A large-caliber automatic welding device according to claim 2, characterized in that: The moving mechanism (300) further comprises: A driver (5) is arranged on the movable seat (1), the driver (5) is in driving connection with the wheel (4), and the driver (5) is used to drive the wheel (4) to rotate.

4. A large-caliber automatic welding device according to claim 1, characterized in that: The moving mechanism (300) further comprises: A water storage box (6) is arranged on the movable seat (1); A plurality of water spray heads (7) are provided, each of the plurality of water spray heads (7) is arranged on the movable seat (1), each of the plurality of water spray heads (7) is located in the cavity (101), each of the plurality of water spray heads (7) is connected to the water storage box (6), and after the water spray heads (7) are used to spray water into the cavity (101), the bottom surface of the sealing ring (2) contacts with water and forms a water film.

5. A large-caliber automatic welding device according to claim 1, characterized in that: The movable seat (1) has an opening (1011), wherein the opening (1011) is located above the cavity (101) and is in communication with the cavity (101). The movable mechanism (300) further comprises: A top cover (8) is arranged on the movable seat (1), the top cover (8) covers the opening (1011), the top cover (8) has a through hole (801), and the negative pressure generating member (3) is connected to the through hole (801).

6. A large-caliber automatic welding device according to claim 4, characterized in that: The moving mechanism (300) further comprises: A plurality of rotating brush bodies (9) are provided on the movable seat (1), and each rotating brush body (9) is rotatably provided between two adjacent water spray heads (7). After the water spray heads (7) spray water, the rotating brush bodies (9) are used to throw the water flow to the connection between the sealing ring (2) and the large-diameter pipe (100).

7. A large-caliber automatic welding device according to claim 1, characterized in that: The moving mechanism (300) further comprises: At least two positioning ropes (10) are provided, the positioning ropes (10) are wound around the outer wall of the large-diameter pipe (100), and the positioning ropes (10) are used as a moving path for the moving seat (1); A plurality of connecting blocks (11) are provided, wherein the connecting blocks (11) are arranged on the bottom surface of the movable seat (1), each of the positioning ropes (10) is passed through at least two of the connecting blocks (11), and the connecting blocks (11) are slidably arranged on the positioning ropes (10).

8. A large-caliber automatic welding device according to claim 1, characterized in that: The movable seat (1) is provided with a plurality of connection ends (12), and the movable seat (1) is arranged on the bottom surface of the external welding machine (200) via the connection ends (12).

9. A welding process for large-diameter pipes, applied to a large-diameter automatic welding device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, winding the positioning rope (10) around the outer wall of the large-diameter pipe (100); S2, then installing the movable seat (1) on the positioning rope (10), and fitting the sealing ring (2) below the movable seat (1) onto the outer wall of the large-diameter pipe (100); S3, the negative pressure generating element (3) is activated, the cavity (101) forms a sealed space, and the movable seat (1) is adsorbed on the outer wall of the large-diameter pipe (100) S4, starting the external welding machine (200), and the moving seat (1) drives the external welding machine (200) to move along the welding direction.

10. A welding process for a large-diameter pipeline according to claim 9, characterized in that: The specific steps of S1 are: S101, arranging a positioning rope (10) according to a welding position of a large-diameter pipeline (100), so that the positioning rope (10) is parallel to an edge of the welding position.

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