Anti-corrosion and heat-preservation steel pipe welding device

Abstract

The application discloses a kind of anticorrosion heat-insulated steel pipe welding devices, it is related to the field of anticorrosion heat-insulated steel pipe processing, including welding conveying table and the welding torch unit being arranged above it, the both sides of the welding conveying table are respectively provided with standby material conveying table and blanking conveying table, the both ends of the inboard of the standby material conveying table are symmetrically equipped with a plurality of standby material electric drive rollers, two groups of the standby material electric drive rollers convey two side steel pipes to move to opposite sides, the inboard of the blanking conveying table is equipped with a plurality of blanking electric drive rollers.The anticorrosion heat-insulated steel pipe welding device, by designing three-station integrated layout and linkage material changing mechanism, so that cylinder jacking and electric drive material changing roller cooperate, can complete the blanking of post-welded finished steel pipe and the feeding of steel pipe to be welded in the same action cycle, avoid the time waste of traditional equipment blanking step by step, significantly shorten the process interval, improve the effective operation time of equipment.

Description

Technical Field

[0001] This invention relates to the processing technology of anti-corrosion and heat-insulating steel pipes, and specifically to a welding device for anti-corrosion and heat-insulating steel pipes. Background Technology

[0002] Corrosion-resistant and heat-insulating steel pipes are widely used in key sectors of the national economy, such as oil and gas transportation, municipal centralized heating, urban water supply and drainage, and industrial fluid transportation. Their welding quality directly determines the operational safety, service life, and energy transmission efficiency of the pipeline system. With the rapid advancement of infrastructure construction in my country, the demand for corrosion-resistant and heat-insulating steel pipes continues to grow, while simultaneously placing higher demands on the precision, efficiency, and quality stability of steel pipe welding.

[0003] Currently, the welding of anti-corrosion and heat-insulating steel pipes is mainly carried out using semi-automatic welding equipment combined with manual assistance. In existing technology, typical steel pipe welding equipment usually consists of a single-station conveyor, a welding torch mechanism, and a simple clamping device. However, in actual production, this reveals the following significant technical defects: 1. Low efficiency in loading, unloading, and material handling, resulting in low equipment utilization: Existing single-station welding equipment requires that after completing the welding of one steel pipe, the finished steel pipe must be unloaded manually or with the aid of lifting equipment, and then the steel pipe to be welded must be hoisted to the welding station. The loading and unloading process is carried out in steps, with long intervals between processes, resulting in a low percentage of effective equipment operating time, which is difficult to meet the needs of large-scale mass production. In addition, manual transfer of steel pipes poses significant safety hazards and is labor-intensive.

[0004] 2. Low precision in steel pipe butt welding and high workload for manual adjustment: Existing equipment mostly uses parallel-arranged flat rollers for steel pipe conveying. During conveying, the steel pipes are prone to axial and radial deviation, resulting in excessive misalignment at the ends of the two sections to be welded. To ensure welding quality, operators need to repeatedly adjust the position of the steel pipes manually, which not only prolongs the butt welding preparation time but also makes the accuracy of misalignment control highly susceptible to human factors, easily leading to problems such as poor weld formation and welding stress concentration, which can cause leakage during pipeline operation in severe cases. At the same time, manual adjustment can easily scratch the anti-corrosion and insulation layer on the surface of the steel pipe, causing damage to the anti-corrosion layer and reducing the pipeline's anti-corrosion and insulation performance.

[0005] Therefore, the present invention provides a welding device for anti-corrosion and heat-insulating steel pipes to overcome the above-mentioned shortcomings in the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a welding device for anti-corrosion and heat-insulating steel pipes to overcome the above-mentioned shortcomings in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a welding device for anti-corrosion and heat-insulating steel pipes, comprising a welding conveying table and a welding gun unit disposed above it. A material preparation conveying table and a material unloading conveying table are respectively disposed on both sides of the welding conveying table. A plurality of material preparation electric drive rollers are symmetrically installed at both ends of the inner side of the material preparation conveying table. The two sets of material preparation electric drive rollers convey the steel pipes on both sides to move towards the opposite side. A plurality of material unloading electric drive rollers are installed on the inner side of the material unloading conveying table. A plurality of alignment electric drive inclined rollers are symmetrically installed at both ends of the inner side of the welding conveying table. The rotation directions of the alignment electric drive inclined rollers on both sides are opposite. The alignment electric drive inclined rollers on the same side are symmetrically distributed on both sides of the conveying direction of the inner wall of the welding conveying table, and the end of the alignment electric drive inclined roller close to the center line of the conveying direction of the welding conveying table is inclined downward. The welding conveyor, the material preparation conveyor, and the unloading conveyor are all equipped with a material changing mechanism. The material changing mechanism is used to transport the steel pipe on the welding conveyor to the unloading conveyor, and at the same time, transport the steel pipe on the material preparation conveyor to the welding conveyor. An auxiliary welding unit is provided on the welding conveyor table, which is used to drive the two aligned steel pipes to rotate.

[0008] Furthermore, the material changing mechanism includes a mounting frame installed on the material preparation conveyor and the material unloading conveyor. A first cylinder is symmetrically installed at both ends of the upper surface of the mounting frame. The bottom end of the telescopic end of the first cylinder passes through the mounting frame and is fixedly installed with a drive frame located below the mounting frame. Several electrically driven material changing rollers are equidistantly installed at the bottom of the drive frame along the direction from the material preparation conveyor to the material unloading conveyor. Four sets of first guide rods are installed on the surface of the drive frame in a rectangular shape. The first guide rods pass through the surface of the mounting frame and are slidably connected to its inner wall.

[0009] Furthermore, there are two sets of electrically driven material changing rollers on the same drive frame, which are symmetrically distributed on both sides of the bottom surface of the drive frame.

[0010] Furthermore, a second cylinder is installed at the bottom of the inner wall of the welding conveyor, the material preparation conveyor, and the unloading conveyor. A lifting frame is installed at the top of the telescopic end of the second cylinder, and multiple sets of top seats are installed on the lifting frame.

[0011] Furthermore, the inner walls of the welding conveyor, the material preparation conveyor, and the unloading conveyor are all provided with vertical guide grooves, and the side of the lifting frame is equipped with guide blocks that are adapted to the vertical guide grooves, and the guide blocks are slidably connected to the inner wall of the vertical guide grooves.

[0012] Furthermore, the auxiliary welding unit includes two sets of third cylinders symmetrically installed on both sides of the top of the mounting frame. Each set on the same side contains two third cylinders, which are spaced apart on the top surface of the mounting frame. An arc-shaped positioning plate adapted to the steel pipe is fixedly installed at the bottom of the telescopic end of the third cylinder. Several positioning rubber wheels are equidistantly installed on the inner wall of the arc-shaped positioning plate. The length direction of the positioning rubber wheels is consistent with the length direction of the welding conveyor table. Second guide rods are symmetrically installed on both sides of the upper surface of the arc-shaped positioning plate. The second guide rods penetrate the surface of the mounting frame and are slidably connected to its inner wall.

[0013] Furthermore, multiple sets of fourth cylinders are fixedly installed at the bottom of the inner wall of the welding conveyor. The multiple sets of fourth cylinders are symmetrically distributed on both sides of the welding gun unit. A lifting plate is fixedly installed at the top of the telescopic end of the fourth cylinder. Extension rods are symmetrically installed on both sides of the upper surface of the lifting plate. An electrically driven rubber roller is rotatably installed at the top of the extension rod.

[0014] Furthermore, the lifting plate is slidably connected to the inner side of the welding conveyor table, and a horizontal plate is fixedly installed on the inner wall of the welding conveyor table. A guide groove corresponding to the extension support rod is opened on the horizontal plate, and the extension support rod is slidably connected to the inner side of the guide groove.

[0015] Furthermore, the length direction of the electrically driven rubber roller is consistent with the length direction of the welding conveyor table.

[0016] Compared with the prior art, the anti-corrosion and heat-insulating steel pipe welding device provided by the present invention has the following beneficial effects: 1. This anti-corrosion and heat-insulating steel pipe welding device, through the design of a three-station integrated layout and linkage material changing mechanism, enables the cylinder lifting and electric drive material changing roller to work in tandem. It can simultaneously complete the unloading of the finished steel pipe after welding and the loading of the steel pipe to be welded within the same action cycle, avoiding the time waste of traditional equipment where loading and unloading are carried out in separate steps, significantly shortening the process interval and improving the effective working time of the equipment.

[0017] 2. This anti-corrosion and heat-insulating steel pipe welding device adopts a symmetrically inclined alignment electric drive inclined roller structure. The axial component of the inclined rollers makes the two steel pipes automatically converge towards the center line of the welding station during the opposite conveying process. Precise end alignment can be achieved without manual assistance, which effectively solves the problems of steel pipe offset and large misalignment that are easy to occur in traditional flat roller conveying. It controls the welding misalignment within the allowable range of the process and significantly shortens the docking adjustment time.

[0018] 3. This anti-corrosion and heat-insulating steel pipe welding device adopts a split structure with an upper positioning and lower driving combination in the auxiliary welding unit. The upper arc-shaped positioning plate, together with multiple sets of positioning rubber wheels, realizes the radial flexible limitation of the steel pipe, while the lower electric drive rubber roller provides stable circumferential rotation power, so that the steel pipe can rotate at a uniform speed and smoothly during the welding process. The welding gun can continuously and uniformly weld the circumferential seam, effectively avoiding defects such as uneven weld width and uneven penetration depth caused by manual rotation of the steel pipe, and improving the mechanical properties of the welded joint. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall top view structure provided for an embodiment of the present invention; Figure 2 A schematic diagram of the welding conveyor, material preparation conveyor, and unloading conveyor provided in an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the welding conveyor provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the overall bottom view structure provided for an embodiment of the present invention; Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the structure of the horizontal plate and the extension support rod in a separated state according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Welding conveyor table; 11. Welding gun unit; 2. Material preparation conveyor table; 21. Material unloading conveyor table; 22. Material preparation electric drive roller; 23. Material unloading electric drive roller; 24. Alignment electric drive inclined roller; 3. Mounting frame; 31. First cylinder; 32. Drive frame; 33. Electric drive material changing roller; 34. Second cylinder; 35. Lifting frame; 36. Top seat; 4. Third cylinder; 41. Arc-shaped positioning plate; 42. Positioning rubber wheel; 43. Fourth cylinder; 44. Lifting plate; 45. Extension support rod; 46. Electric drive rubber roller; 47. Horizontal plate; 48. Guide groove. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Example: Please see Figures 1-6 A welding device for anti-corrosion and heat-insulating steel pipes includes a welding conveyor table 1 and a welding torch unit 11 disposed above it. The welding torch unit 11 is existing technology and will not be described in detail here.

[0024] A material preparation conveyor 2 and a material unloading conveyor 21 are respectively set on both sides of the welding conveyor table 1. The width and height of the welding conveyor table 1, the material preparation conveyor table 2, and the material unloading conveyor 21 are all the same, and their top surfaces are flush to form a continuous transverse material exchange channel. Several material preparation electric drive rollers 22 are symmetrically installed at both ends of the inner side of the material preparation conveyor table 2. The two sets of material preparation electric drive rollers 22 transport the steel pipes on both sides to move to the opposite side. Several material unloading electric drive rollers 23 are installed on the inner side of the material unloading conveyor table 21. Several aligning electric drive inclined rollers 24 are symmetrically installed at both ends of the inner side of the welding conveyor table 1. The rotation directions of the aligning electric drive inclined rollers 24 on both sides are opposite. The material preparation electric drive rollers 22, the material unloading electric drive rollers 23, and the aligning electric drive inclined rollers 24 are all located below the top of the welding conveyor table 1. The aligning electric drive inclined rollers 24 on the same side are symmetrically distributed on both sides of the conveying direction of the inner wall of the welding conveyor table 1, and the end of the aligning electric drive inclined roller 24 closest to the center line of the conveying direction of the welding conveyor table 1 is inclined downward. A material changing mechanism is provided on the welding conveyor 1, the material preparation conveyor 2, and the unloading conveyor 21. The material changing mechanism is used to transport the steel pipe on the welding conveyor 1 to the unloading conveyor 21, and at the same time, transport the steel pipe on the material preparation conveyor 2 to the welding conveyor 1. An auxiliary welding unit is provided on the welding conveyor table 1. The auxiliary welding unit is used to drive the two aligned steel pipes to rotate.

[0025] In this embodiment, the material changing mechanism includes a mounting frame 3 installed on the material preparation conveying platform 2 and the material unloading conveying platform 21. A first cylinder 31 is symmetrically installed at both ends of the upper surface of the mounting frame 3. The bottom end of the telescopic end of the first cylinder 31 passes through the mounting frame 3 and is fixedly installed with a drive frame 32 located below the mounting frame 3. Several electrically driven material changing rollers 33 are equidistantly installed at the bottom of the drive frame 32 along the direction from the material preparation conveying platform 2 to the material unloading conveying platform 21.

[0026] It should be added that four sets of first guide rods are installed on the rectangular surface of the drive frame 32. The first guide rods penetrate the surface of the mounting frame 3 and are slidably connected to its inner wall, so that the first guide rods can stably guide the vertical movement of the drive frame 32, making its lifting and lowering movement more stable.

[0027] Furthermore, there are two sets of electrically driven material changing rollers 33 on the same drive frame 32, which are symmetrically distributed on both sides of the bottom surface of the drive frame 32, so that they can make multi-point contact with the steel pipe, thereby enabling stable conveying of the steel pipe.

[0028] In this embodiment, a second cylinder 34 is installed at the bottom of the inner wall of the welding conveyor 1, the material preparation conveyor 2, and the unloading conveyor 21. A lifting frame 35 is installed at the top of the telescopic end of the second cylinder 34. Multiple sets of top seats 36 are installed on the lifting frame 35. Vertical guide grooves are opened on the inner walls of the welding conveyor 1, the material preparation conveyor 2, and the unloading conveyor 21. Guide blocks adapted to the vertical guide grooves are installed on the side of the lifting frame 35. The guide blocks are slidably connected to the inner wall of the vertical guide grooves. By setting guide blocks on the side of the lifting frame 35 and slidingly engaging with the vertical guide grooves on the inner walls of the welding conveyor 1, the material preparation conveyor 2, and the unloading conveyor 21, a reliable vertical guiding system is formed. This effectively prevents the lifting frame 35 from shifting left and right or twisting during the lifting process, ensures that the support position of the top seats 36 on the steel pipe is accurate and consistent, avoids the steel pipe from tipping over during the lifting process, and improves the reliability and repeatability of the lifting action.

[0029] In this embodiment, the auxiliary welding unit includes two sets of third cylinders 4 symmetrically installed on both sides of the top of the mounting frame 3. There are two third cylinders 4 in each set on the same side, and they are spaced apart on the top surface of the mounting frame 3. An arc-shaped positioning plate 41 adapted to the steel pipe is fixedly installed at the bottom of the telescopic end of the third cylinder 4. Several positioning rubber wheels 42 are equidistantly installed on the inner wall of the arc-shaped positioning plate 41.

[0030] In order to ensure that the positioning rubber wheel 42 can stably limit the steel pipe during welding without restricting its rotation rod, the length direction of the positioning rubber wheel 42 is consistent with the length direction of the welding conveyor table 1.

[0031] It should be added that second guide rods are symmetrically installed on both sides of the upper surface of the arc-shaped positioning plate 41. The second guide rods penetrate the surface of the mounting bracket 3 and are slidably connected to its inner wall, so that the second guide rods can stably guide the lifting and lowering movement of the arc-shaped positioning plate 41.

[0032] In this embodiment, multiple sets of fourth cylinders 43 are fixedly installed at the bottom of the inner wall of the welding conveyor table 1. The multiple sets of fourth cylinders 43 are symmetrically distributed on both sides of the welding gun unit 11. A lifting plate 44 is fixedly installed at the top of the telescopic end of the fourth cylinder 43. Extension rods 45 are symmetrically installed on both sides of the upper surface of the lifting plate 44. An electric drive rubber roller 46 is rotatably installed at the top of the extension rod 45. During operation, the two electric drive rubber rollers 46 rotate synchronously in opposite directions and transport the two steel pipes on their surfaces toward each other, so that the welding ends can be effectively joined.

[0033] To ensure the stability of the electric drive rubber roller 46 during its lifting and lowering motion, the lifting plate 44 is slidably connected to the inner side of the welding conveyor table 1, and a horizontal plate 47 is fixedly installed on the inner wall of the welding conveyor table 1. A guide groove 48 corresponding to the extension support rod 45 is opened on the horizontal plate 47, and the extension support rod 45 is slidably connected to the inner side of the guide groove 48.

[0034] To ensure that the electric drive roller 46 can be driven to rotate smoothly during the steel pipe welding process, the length direction of the electric drive roller 46 is consistent with the length direction of the welding conveyor table 1.

[0035] During operation, two steel pipes to be welded are placed at opposite ends of the material preparation conveyor 2. The electric roller 22 is activated, driving the two steel pipes to move closer together. Once the pipes are conveyed to the designated position, all second cylinders 34 are activated, driving the lifting frame 35 upward so that its top is flush with the top surfaces of the welding conveyor 1, the material preparation conveyor 2, and the unloading conveyor 21. Then, the first cylinder 31 drives the drive frame 32 downward, causing the electric roller 33 to move downward until it contacts the surface of the steel pipe. Afterward, the electric roller 33 rotates, driving the steel pipe towards the welding conveyor 1. The steel pipe is moved until it reaches the welding conveyor 1 and contacts the surface of the top seat 36 on the welding conveyor 1. Then, the second cylinder 34 drives the top seat 36 to move downward, causing the steel pipe to move downward until it contacts the surface of the alignment electric drive inclined roller 24. If the initial lowering position of the steel pipe is offset, it can correct its position by its own weight. Then, the alignment electric drive inclined roller 24 rotates synchronously in the opposite direction and drives the two steel pipes to be welded on both sides to move closer to each other until the ends contact and fit together directly below the welding gun unit 11, completing the pre-welding preparation of the steel pipe to be welded.

[0036] After the alignment of the steel pipes to be welded is completed, the fourth cylinder 43 is activated, driving the lifting plate 44 to rise, so that the electric-driven rubber roller 46 makes close contact with the lower surfaces of the two steel pipes, and drives the steel pipes to be welded to move upward and separate from the alignment electric-driven inclined roller 24. Then, the third cylinder 4 is activated and drives the arc-shaped positioning plate 41 to move downward until the positioning rubber wheel 42 on its inner wall is in contact with the surface of the steel pipe, thereby realizing the radial flexible limit of the steel pipe, preventing radial runout and axial movement of the steel pipe during rotation, and ensuring that the butt joint surfaces are always in close contact. Afterward, the electric-driven rubber roller 46 is activated, driving the two steel pipes to rotate synchronously and uniformly in the same direction at a set speed, and welding is performed on the two through the welding gun unit 11 during the rotation.

[0037] During the process of the steel pipe being transported from the preparation conveyor 2 to the welding conveyor 1, if there is a welded steel pipe on the welding conveyor 1, it will be transported to the unloading conveyor 21 at the same time. After it is transported to the unloading conveyor 21, the preparation conveyor 2 continues the initial transport of the two steel pipes, so that it is ready to feed the steel pipe to the welding conveyor 1 again at any time. During this process, the steel pipe on the welding conveyor 1 is welded under the action of the welding gun unit 11. At the same time, the steel pipe on the unloading conveyor 21 is transported away.

[0038] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, 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 foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A welding device for anti-corrosion and heat-insulating steel pipes, comprising a welding conveyor table (1) and a welding torch unit (11) disposed above it, characterized in that, The welding conveying platform (1) is provided with a material preparation conveying platform (2) and a material unloading conveying platform (21) on both sides respectively. Several material preparation electric drive rollers (22) are symmetrically installed at both ends of the inner side of the material preparation conveying platform (2). The two sets of material preparation electric drive rollers (22) convey the steel pipes on both sides to move to the opposite side. Several material unloading electric drive rollers (23) are installed on the inner side of the material unloading conveying platform (21). Several alignment electric drive inclined rollers (24) are symmetrically installed at both ends of the inner side of the welding conveying platform (1). The rotation directions of the alignment electric drive inclined rollers (24) on both sides are opposite. The alignment electric drive inclined rollers (24) on the same side are symmetrically distributed on both sides of the conveying direction of the inner wall of the welding conveying platform (1). The end of the alignment electric drive inclined roller (24) close to the center line of the conveying direction of the welding conveying platform (1) is inclined downward. The welding conveying table (1), the material preparation conveying table (2) and the unloading conveying table (21) are all equipped with a material changing mechanism. The material changing mechanism is used to transport the steel pipe on the welding conveying table (1) to the unloading conveying table (21) and at the same time transport the steel pipe on the material preparation conveying table (2) to the welding conveying table (1). An auxiliary welding unit is provided on the welding conveyor table (1), which is used to drive the two aligned steel pipes to rotate.

2. The anti-corrosion and heat-insulating steel pipe welding device according to claim 1, characterized in that, The material changing mechanism includes a mounting frame (3) installed on the material preparation conveyor (2) and the material unloading conveyor (21). The two ends of the upper surface of the mounting frame (3) are symmetrically mounted with first cylinders (31). The bottom end of the telescopic end of the first cylinder (31) passes through the mounting frame (3) and is fixedly mounted with a drive frame (32) located below the mounting frame (3). The bottom of the drive frame (32) is equidistantly mounted with several electrically driven material changing rollers (33) along the direction from the material preparation conveyor (2) to the material unloading conveyor (21). The surface of the drive frame (32) is rectangularly mounted with four sets of first guide rods. The first guide rods pass through the surface of the mounting frame (3) and are slidably connected to its inner wall.

3. The anti-corrosion and heat-insulating steel pipe welding device according to claim 2, characterized in that, There are two sets of electrically driven material changing rollers (33) on the same drive frame (32), and they are symmetrically distributed on both sides of the bottom surface of the drive frame (32).

4. The anti-corrosion and heat-insulating steel pipe welding device according to claim 2, characterized in that, The bottom of the inner wall of the welding conveyor (1), the material preparation conveyor (2) and the unloading conveyor (21) is equipped with a second cylinder (34), and a lifting frame (35) is installed on the top of the telescopic end of the second cylinder (34). Multiple sets of top seats (36) are installed on the lifting frame (35).

5. The anti-corrosion and heat-insulating steel pipe welding device according to claim 4, characterized in that, The inner walls of the welding conveyor (1), the material preparation conveyor (2) and the unloading conveyor (21) are all provided with vertical guide grooves. The side of the lifting frame (35) is equipped with guide blocks that are compatible with the vertical guide grooves. The guide blocks are slidably connected to the inner wall of the vertical guide grooves.

6. The anti-corrosion and heat-insulating steel pipe welding device according to claim 1, characterized in that, The auxiliary welding unit includes two sets of third cylinders (4) symmetrically installed on both sides of the top of the mounting frame (3). There are two third cylinders (4) in each set on the same side, and they are spaced apart on the top surface of the mounting frame (3). An arc-shaped positioning plate (41) adapted to the steel pipe is fixedly installed at the bottom of the telescopic end of the third cylinder (4). Several positioning rubber wheels (42) are equidistantly installed on the inner wall of the arc-shaped positioning plate (41). The length direction of the positioning rubber wheels (42) is consistent with the length direction of the welding conveyor table (1). Second guide rods are symmetrically installed on both sides of the upper surface of the arc-shaped positioning plate (41). The second guide rods penetrate the surface of the mounting frame (3) and slide to connect with its inner wall.

7. The anti-corrosion and heat-insulating steel pipe welding device according to claim 6, characterized in that, Multiple sets of fourth cylinders (43) are fixedly installed on the bottom of the inner wall of the welding conveyor (1). The multiple sets of fourth cylinders (43) are symmetrically distributed on both sides of the welding gun unit (11). A lifting plate (44) is fixedly installed on the top of the telescopic end of the fourth cylinder (43). Extension rods (45) are symmetrically installed on both sides of the upper surface of the lifting plate (44). An electric drive rubber roller (46) is rotatably installed on the top of the extension rod (45).

8. The anti-corrosion and heat-insulating steel pipe welding device according to claim 7, characterized in that, The lifting plate (44) is slidably connected to the inner side of the welding conveyor table (1), and a horizontal plate (47) is fixedly installed on the inner wall of the welding conveyor table (1). A guide groove (48) corresponding to the extension rod (45) is opened on the horizontal plate (47), and the extension rod (45) is slidably connected to the inner side of the guide groove (48).

9. The anti-corrosion and heat-insulating steel pipe welding device according to claim 7, characterized in that, The length direction of the electrically driven rubber roller (46) is consistent with the length direction of the welding conveyor table (1).

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