A laser welding machine for repair welding of galvanized steel pipe

Abstract

This invention provides a laser welding machine for repairing galvanized steel pipes, relating to the field of laser welding machine technology. It includes a welding station and a laser welding torch, the laser welding torch being movable on the welding station. The machine also includes a butt clamping mechanism, a welding pool, a pre-weld treatment mechanism, and a gas flow treatment mechanism. Two clamping platforms are slidably connected to the welding station, and these platforms can drive the galvanized steel pipe to rotate. The welding pool is located on the welding station between the two clamping platforms. The pre-weld treatment mechanism can perform grinding pre-treatment on the area of ​​the galvanized steel pipe to be welded. The gas flow treatment mechanism consists of clamping arm assembly one and clamping arm assembly two, rotatably connected to both sides of the pre-weld treatment mechanism. During welding, clamping arm assembly one and clamping arm assembly two can clamp the welding position of the galvanized steel pipe and use gas flow to carry away zinc vapor from the molten pool. This solves the technical problem in related technologies where zinc metal on the surface of galvanized steel pipes evaporates into zinc vapor during welding, affecting welding quality.

Description

Technical Field

[0001] This invention belongs to the field of laser welding machine technology, specifically, it relates to a laser welding machine for repair welding of galvanized steel pipes. Background Technology

[0002] Galvanized pipe is a type of pipe with a layer of zinc plated on its surface. The zinc metal on the surface prevents rust and it is widely used in water and gas transportation. In actual use, galvanized pipes need to be welded together or welded to structures such as flanges.

[0003] In existing technologies, welding is mostly done manually, or the galvanized steel pipe is fixed with a clamp and a robotic arm drives the laser welding head to align with the weld seam. The clamp rotates the galvanized steel pipe to complete one revolution of welding. The same principle applies to repair welding. After rotating to the position to be welded, welding is carried out. However, galvanized steel pipes are different from different steel plates. The boiling point of zinc in the galvanized layer is about 906°C, while the melting point of steel is higher, about 1500°C. After the steel pipe melts, the zinc has evaporated into zinc vapor. The zinc vapor may be trapped in the molten pool, which can easily cause porosity and spatter at the welding position, affecting the welding quality. Summary of the Invention

[0004] The purpose of this invention is to provide a laser welding machine for repairing galvanized steel pipes, which solves the technical problem in related technologies that the zinc metal on the surface of galvanized steel pipes evaporates into zinc vapor during welding, affecting the welding quality.

[0005] A laser welding machine for repairing galvanized steel pipes includes a welding station and a laser welding gun. The laser welding gun is movable on the welding station. The machine also includes a butt clamping mechanism, a welding pool, a pre-weld treatment mechanism, and a gas flow treatment mechanism. The butt clamping mechanism consists of two clamping platforms slidably connected to the welding station and arranged opposite each other. The clamping platforms can drive the galvanized steel pipe to rotate. The welding pool is located on the welding station, between the two clamping platforms, and below the laser welding gun. The pre-weld treatment mechanism is located in the welding pool and can move vertically within it. The pre-weld treatment mechanism can perform grinding pre-treatment on the area of ​​the galvanized steel pipe to be welded. The gas flow treatment mechanism consists of a clamping arm assembly one and a clamping arm assembly two, rotatably connected to both sides of the pre-weld treatment mechanism and connected to an external air supply pump and an external air extraction pump, respectively. During welding, the clamping arm assembly one and clamping arm assembly two can clamp the welding area of ​​the galvanized steel pipe and carry away zinc vapor from the molten pool through the gas flow.

[0006] The pre-welding treatment mechanism includes a grinding platform and a grinding column. The grinding platform is located in the welding pool and is equipped with a motor that drives the grinding wheel to rotate. Multiple drive cylinders are mounted on the grinding platform, and the output ends of the drive cylinders are fixedly connected to the welding pool. The grinding column is fixedly connected to the grinding platform, and the grinding wheel is rotatably mounted on the platform. The grinding platform is positioned below the galvanized steel pipe. By grinding the welding position as a pre-treatment, zinc in and around the welding area can be removed, reducing the amount of zinc vapor during welding. Simultaneously, the weld seam can be ground to prevent the shape of previous welds from being difficult to repair. After cleaning, uniform welding is performed.

[0007] Before welding the galvanized steel pipe, the output end of the first drive cylinder extends and pushes the grinding wheel upward to contact the welding position on the galvanized steel pipe. At this time, the first clamping arm assembly and the second clamping arm assembly rotate to a position away from the galvanized steel pipe.

[0008] The clamping arm assembly one and the clamping arm assembly two have the same structure. The clamping arm assembly one includes a clamping arm frame, a gas guide pipe, a vent, and a roller shutter assembly. The clamping arm frame is rotatably connected to the side of the grinding column. The clamping arm frame is hollow. A gas guide pipe is connected to the side of the clamping arm frame away from the galvanized steel pipe. The vent is located on the side of the clamping arm frame closest to the galvanized steel pipe. Sliding grooves are provided on both sides of the vent. The roller shutter assembly is located in the clamping arm frame. The roller shutter assembly can slide in the sliding grooves under the push of the galvanized steel pipe and partially block the vent. The vents on the two clamping arm frames are for air intake and exhaust, respectively. The gas flows in the molten pool, and the zinc vapor during welding can be removed by the airflow.

[0009] The roller blind assembly includes a take-up shaft, a roller blind, and a pusher plate. The take-up shaft is rotatably connected to the clamping arm frame, and the roller blind is wound around the take-up shaft. One end of the sliding groove near the take-up shaft is open, and the roller blind is slidably connected in the sliding groove. The pusher plate is fixedly connected to the end of the roller blind located in the sliding groove, and extends beyond the ventilation opening. A galvanized steel pipe pushes the pusher plate, causing the roller blind to slide within the sliding groove. The galvanized steel pipe pushes the roller blind to slide within the sliding groove, partially blocking the ventilation opening, leaving only the area above the galvanized steel pipe open, corresponding to the laser welding gun and welding position.

[0010] A second drive cylinder is rotatably connected to the side of the clamping arm frame away from the galvanized steel pipe. The output end of the second drive cylinder is rotatably connected to the clamping arm frame, and a pipe bracket is provided on the output end of the second drive cylinder. The air guide pipe passes through the pipe bracket. The pipe bracket holds the air guide pipe in place, preventing it from rotating to the side of the welding position when the clamping arm frame rotates, thus avoiding interference with the welding process.

[0011] When the two clamping arm frames rotate toward the galvanized steel pipe to a certain angle and then stop rotating, a gap is left between the ends of the two clamping arm frames that are away from the grinding column. The laser welding gun can then be inserted into the gap to weld the galvanized steel pipe.

[0012] A limiting plate is provided on the side of the ventilation port near the grinding column. When the clamping arm frame rotates to a position away from the galvanized steel pipe, the pushing plate abuts against the limiting plate. The limiting plate ensures that the pushing plate can no longer be torsional or pulled by the winding shaft after sliding to a fixed position, so that the pushing plate is above the galvanized steel pipe after rotating the clamping arm frame, which can handle steel pipes of various diameters.

[0013] After the galvanized steel pipe is polished by the grinding wheel, the two clamping arm frames rotate to both sides of the galvanized steel pipe. At this time, the push plate is set above the galvanized steel pipe, and the welding position on the galvanized steel pipe is in contact with the push plate. The push plate is set in an arc shape and is in close contact with the galvanized steel pipe.

[0014] The significant technical effects of this invention are as follows: This invention utilizes two clamping platforms to rotate and move the galvanized steel pipe. When welding two galvanized steel pipes, the distance between them can be adjusted to further control welding quality. Before welding, the galvanized steel pipe is clamped near the welding position using clamping arms. Two clamping arms above the galvanized steel pipe allow for air flow at the welding position, with one side for exhaust and the other for intake, thus removing zinc vapor and preventing weld porosity caused by zinc vapor during repair welding. This application reduces the zinc content at the welding position and removes zinc vapor from the molten pool through pre-treatment and ventilation during welding. Compared to traditional laser welding guns, this application automatically pre-treats and processes the weld, improving welding quality. It can handle steel pipes of various sizes and is highly versatile. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a laser welding machine for repairing galvanized steel pipes according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3This is a partial cross-sectional view of the laser welding gun and clamping frame in this invention. Figure 4 This is a partial cross-sectional view of the internal structure of the welding pool in this invention; Figure 5 This is a partial cross-sectional view of the clamping arm frame when it is far from the galvanized steel pipe in this invention. Figure 6 This is a partial cross-sectional view of the internal structure of the clamping arm frame in this invention.

[0017] In the diagram: 1. Welding station; 2. Laser welding gun; 3. Clamping table; 4. Welding pool; 5. Grinding platform; 6. Drive cylinder one; 7. Grinding column; 8. Grinding wheel; 9. Clamping arm frame; 10. Air duct; 11. Air exchange port; 12. Sliding groove; 13. Rewinding shaft; 14. Roller shutter; 15. Pushing plate; 16. Drive cylinder two; 17. Pipe rack; 18. Limiting plate. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure. For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this disclosure will be explained and described below.

[0019] It should be understood that the described embodiments are merely some, not all, of the embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0020] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The singular forms “a,” “the,” and “the” as used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0021] It should be understood that the term "and / or" used in this article is merely a way of describing the logical relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0022] Depending on the context, the word "if" as used here can be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination" or "in response to determination" or "when detection (of the stated condition or event)" or "in response to detection (of the stated condition or event)."

[0023] It should be understood that the terms "first," "second," etc., used in this disclosure are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order.

[0024] In the description of this disclosure, the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of this disclosure.

[0025] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can be fixed connections, detachable connections, mating connections or integral connections; those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0026] like Figures 1-6The diagram illustrates a laser welding machine for repairing galvanized steel pipes according to an embodiment of the present invention. It includes a welding station 1 and a laser welding torch 2, the latter capable of moving on the welding station 1. The machine also includes a butt clamping mechanism, a welding pool 4, a pre-weld treatment mechanism, and a gas flow treatment mechanism. The butt clamping mechanism consists of two clamping platforms 3, slidably connected to the welding station 1 and arranged opposite to each other. The clamping platforms 3 can drive the galvanized steel pipe to rotate. The welding pool 4 is located on the welding station 1, between the two clamping platforms 3, and below the laser welding torch 2. The pre-weld treatment mechanism is located in the welding pool 4 and can move vertically within it. The pre-weld treatment mechanism can perform grinding pre-treatment on the areas of the galvanized steel pipe to be welded. The gas flow treatment mechanism consists of a clamping arm assembly. The first and second clamping arm assemblies are rotatably connected to both sides of the pre-welding treatment mechanism and are respectively connected to the external air supply pump and air extraction pump. During welding, the first and second clamping arm assemblies can clamp the welding position of the galvanized steel pipe and carry away the zinc vapor in the molten pool through airflow. This application sets up a pre-welding treatment mechanism and an airflow treatment mechanism. Before welding, the welding position is treated by the pre-welding treatment mechanism. During welding, the welding position is ventilated by the airflow treatment mechanism. The airflow drives the zinc vapor to flow to avoid affecting the welding quality. In traditional welding machines, after the galvanized steel pipe is fixed, the laser welding gun 2 moves to the weld seam according to the set position to weld. There is no vacuum or fast gas flow environment set at the welding position, which makes it difficult to avoid affecting the welding position.

[0027] like Figures 1-4 As shown, the pre-welding treatment mechanism includes a grinding platform 5 and a grinding column 7. The grinding platform 5 is set in the welding pool 4. A motor that drives the grinding wheel 8 to rotate is installed on the grinding platform 5. Multiple drive cylinders 6 are installed on the grinding platform 5, and the output ends of the drive cylinders 6 are fixedly connected to the welding pool 4. The grinding column 7 is fixedly connected to the grinding platform 5. The grinding wheel 8 is rotatably mounted on the grinding platform 5. The grinding platform 5 is positioned below the galvanized steel pipe. Through pre-treatment grinding of the welding position, zinc in and around the welding position can be removed, reducing the amount of zinc vapor during welding. Simultaneously, the weld seam can be ground, preventing the previous weld shape from being difficult to repair. After cleaning, uniform welding is carried out. Before welding the galvanized steel pipe, the output end of the drive cylinder 6 extends to push the grinding wheel 8 upward to contact the welding position on the galvanized steel pipe. At this time, the clamping arm assembly 1 and clamping arm assembly 2 rotate to a position away from the galvanized steel pipe. The dust after grinding can be collected in the welding pool 4. When cleaning the weld, the galvanized steel pipe can be rotated and moved by the clamping table 3 to remove the zinc metal in the weld and the surrounding area. Alternatively, the original non-compliant weld can be cleaned and re-welded. The height of the galvanized steel pipe remains unchanged during grinding. The output end of the drive cylinder 6 drives the grinding platform 5 to lift and lower to process the weld.

[0028] like Figures 1-6 As shown, clamping arm assembly one and clamping arm assembly two have the same structure. Clamping arm assembly one includes clamping arm frame 9, air guide pipe 10, air exchange port 11 and roller shutter 14 assembly. Clamping arm frame 9 is rotatably connected to the side of grinding column 7. The internal structure of clamping arm frame 9 is as follows. Figure 6 As shown, the clamping arm frame 9 is hollow. A vent pipe 10 is connected to the side of the clamping arm frame 9 away from the galvanized steel pipe. The air exchange port 11 is located on the side of the clamping arm frame 9 close to the galvanized steel pipe. Sliding grooves 12 are provided on both sides of the air exchange port 11. The roller shutter 14 assembly is installed in the clamping arm frame 9. The roller shutter 14 assembly can slide in the sliding groove 12 under the push of the galvanized steel pipe and partially block the air exchange port 11. The air exchange ports 11 on the two clamping arm frames 9 are for air intake and air exhaust respectively. The gas flows in the molten pool position and can remove the zinc vapor during welding through the airflow. Both vent pipes 10 can also be connected to the air pump to draw air from the welding position, so that the welding position is kept in a low-pressure state, which can also remove the zinc vapor.

[0029] like Figures 3-6 As shown, the roller blind 14 assembly includes a take-up shaft 13, a roller blind 14, and a pusher plate 15. The take-up shaft 13 is rotatably connected to the clamping arm frame 9. A coil spring can be installed in the take-up shaft 13 to drive the take-up shaft 13 to rotate, so that the roller blind 14 is subjected to the pulling force of the take-up shaft 13. The roller blind 14 can spring back when it is not in contact with the steel pipe. The roller blind 14 is wound on the take-up shaft 13. The sliding groove 12 is open at one end near the take-up shaft 13. The roller blind 14 is slidably connected in the sliding groove 12. The pusher plate 15 is fixedly connected to the end of the roller blind 14 that is in the sliding groove 12. The 15-inch ventilation port 11 extends out, and the galvanized steel pipe pushes the push plate 15 to drive the roller shutter 14 to slide in the sliding groove 12. The galvanized steel pipe pushes the roller shutter 14 to slide in the sliding groove 12, blocking part of the ventilation port 11. Only the part above the galvanized steel pipe is open. This part corresponds to the laser welding gun 2 and the welding position. When the two clamping arm frames 9 rotate towards the galvanized steel pipe to a certain angle, they stop rotating. At this time, there is a gap between the ends of the two clamping arm frames 9 that are away from the grinding column 7. The laser welding gun 2 can be inserted into the gap to weld the galvanized steel pipe.

[0030] like Figures 3-6As shown, a second drive cylinder 16 is rotatably connected to the side of the clamping arm frame 9 away from the galvanized steel pipe. The output end of the second drive cylinder 16 is rotatably connected to the clamping arm frame 9. A pipe support 17 is provided on the output end of the second drive cylinder 16. The air guide pipe 10 passes through the pipe support 17. The pipe support 17 holds the air guide pipe 10 to prevent it from rotating to the side of the welding position when the clamping arm frame 9 rotates, thus affecting the welding process. The side of the pipe support 17 is fan-shaped to limit the angle of the air guide pipe 10 when the clamping arm frame 9 rotates. A limit plate 18 is provided on the side of the air exchange port 11 near the grinding column 7. When the clamping arm frame 9 rotates to a position away from the galvanized steel pipe, the push plate 15 and the limit plate... The push plate 15 slides to a fixed position and is no longer subject to the torsion pull of the winding shaft 13. This ensures that the push plate 15 is above the galvanized steel pipe after the clamping arm frame 9 is rotated. The drive cylinder 16 directly controls the rotation of the clamping arm frame 9 to handle steel pipes of various diameters. When clamping and grinding the galvanized steel pipe, the output end of the drive cylinder 16 shortens and drives the clamping arm frame 9 to rotate at a horizontal angle. Before welding, the clamping arm frame 9 is rotated to be tangent to the galvanized steel pipe. The setting of the limit plate 18 ensures that a certain distance is maintained between the push plate 15 and the grinding column 7, which facilitates the contact between the clamping arm frame 9 and the galvanized steel pipe after rotation.

[0031] like Figures 3-5 As shown, after the galvanized steel pipe is ground by the grinding wheel 8, the two clamping arm frames 9 rotate to both sides of the galvanized steel pipe. At this time, the push plate 15 is set above the galvanized steel pipe, and the welding position on the galvanized steel pipe is in contact with the push plate 15. The push plate 15 is set in an arc shape and fits against the galvanized steel pipe. After the galvanized steel pipe is ground at the welding position, the clamping arm frames 9 rotate to both sides of the galvanized steel pipe. At this time, the output end of the drive cylinder 6 shortens, causing the clamping arm frames 9 to move downward relative to the galvanized steel pipe. At this time, the galvanized steel pipe pushes the push plate 15, causing the roller shutter 14 to slide in the sliding groove 12. When the galvanized steel pipe contacts the clamping arm frames 9, it stops moving, so that the air vent 11 is only open at the position above the push plate 15, avoiding excessive airflow that cannot flow through the welding position.

[0032] This embodiment provides a laser welding machine for repairing galvanized steel pipes. By driving the galvanized steel pipe to move axially and rotate, the output end of the first drive cylinder 6 extends, causing the grinding platform 5 to rise. The grinding wheel 8 grinds the galvanized steel pipe at the welding position and nearby, which can correct the weld and remove the zinc layer. At this time, the output end of the second drive cylinder 16 extends, pushing the clamping arm frame 9 to rotate to the side of the galvanized steel pipe groove. The output end of the first drive cylinder 6 shortens, pulling the clamping arm frame 9 downward. The galvanized steel pipe pushes the pusher plate 15, causing the roller shutter 14 to slide in the sliding groove 12. When the galvanized steel pipe contacts the clamping arm frame 9, the movement stops. At this time, the laser welding gun 2 can weld the galvanized steel pipe through the gap between the two clamping arm frames 9. At the same time, the air vents 11 on the two clamping arm frames 9 respectively allow air to enter and exit, cleaning the zinc vapor in the molten pool to improve the welding quality.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A laser welding machine for repairing galvanized steel pipes, comprising a welding table (1) and a laser welding gun (2), wherein the laser welding gun (2) is movable on the welding table (1), characterized in that, Also includes: The docking clamp mechanism consists of two clamping platforms (3), which are slidably connected to the welding platform (1). The two clamping platforms (3) are arranged opposite to each other, and the clamping platforms (3) can drive the galvanized steel pipe to rotate. A welding pool (4) is provided on the welding station (1), between the two clamping stations (3), and below the laser welding gun (2); The pre-welding treatment mechanism is set in the welding pool (4) and can be vertically raised and lowered in the welding pool (4). The pre-welding treatment mechanism can perform grinding pre-treatment on the galvanized steel pipe where welding is required. The airflow treatment mechanism consists of clamping arm assembly one and clamping arm assembly two, which are rotatably connected to both sides of the pre-welding treatment mechanism and are respectively connected to an external air supply pump and an external air extraction pump. During welding, clamping arm assembly one and clamping arm assembly two can clamp the welding position of the galvanized steel pipe and carry away the zinc vapor in the molten pool through the airflow.

2. The laser welding machine for repairing galvanized steel pipes according to claim 1, characterized in that, The pre-welding treatment mechanism includes: A grinding platform (5) is set in the welding pool (4). Multiple drive cylinders (6) are set on the grinding platform (5). The output end of the drive cylinders (6) is fixedly connected in the welding pool (4). A grinding column (7) is fixedly connected to the grinding platform (5), and a grinding wheel (8) is rotatably mounted on the grinding platform (5). The grinding platform (5) is located below the galvanized steel pipe.

3. The laser welding machine for repairing galvanized steel pipes according to claim 2, characterized in that, Before welding the galvanized steel pipe, the output end of the drive cylinder (6) extends and pushes the grinding wheel (8) to move upward and contact the welding position on the galvanized steel pipe. At this time, the clamping arm assembly one and the clamping arm assembly two rotate to a position away from the galvanized steel pipe.

4. The laser welding machine for repairing galvanized steel pipes according to claim 3, characterized in that, The clamping arm assembly one has the same structure as the clamping arm assembly two. The clamping arm assembly one includes: The clamping arm frame (9) is rotatably connected to the side of the grinding column (7). The clamping arm frame (9) is hollow. An air guide pipe (10) is connected to the side of the clamping arm frame (9) away from the galvanized steel pipe. An air vent (11) is provided on the side of the clamping arm frame (9) near the galvanized steel pipe, and sliding grooves (12) are provided on both sides of the air vent (11). The roller shutter (14) assembly is disposed in the clamping arm frame (9). The roller shutter (14) assembly can slide in the sliding groove (12) by being pushed by the galvanized steel pipe and partially block the ventilation port (11).

5. A laser welding machine for repairing galvanized steel pipes according to claim 4, characterized in that, The roller blind (14) assembly includes: A winding shaft (13) is rotatably connected in the clamping arm frame (9), and a roller shutter (14) is wound on the winding shaft (13). The sliding groove (12) is open at one end near the winding shaft (13), and the roller blind (14) is slidably connected in the sliding groove (12); The push plate (15) is fixedly connected to one end of the roller shutter (14) located in the sliding groove (12). The push plate (15) extends out of the ventilation port (11). The galvanized steel pipe pushes the push plate (15) to drive the roller shutter (14) to slide in the sliding groove (12).

6. A laser welding machine for repairing galvanized steel pipes according to claim 4, characterized in that, A second drive cylinder (16) is rotatably connected to the side of the clamping arm frame (9) away from the galvanized steel pipe. The output end of the second drive cylinder (16) is rotatably connected to the clamping arm frame (9). A pipe rack (17) is provided on the output end of the second drive cylinder (16). The air guide pipe (10) passes through the pipe rack (17).

7. A laser welding machine for repairing galvanized steel pipes according to claim 5, characterized in that, When the two clamping arm frames (9) rotate toward the galvanized steel pipe to a certain angle and then stop rotating, a gap is left between the ends of the two clamping arm frames (9) away from the grinding column (7), and the laser welding gun (2) can be inserted into the gap to weld the galvanized steel pipe.

8. A laser welding machine for repairing galvanized steel pipes according to claim 5, characterized in that, A limiting plate (18) is provided on the side of the ventilation port (11) near the grinding column (7). When the clamping arm frame (9) rotates to a position away from the galvanized steel pipe, the pushing plate (15) abuts against the limiting plate (18).

9. A laser welding machine for repairing galvanized steel pipes according to claim 8, characterized in that, After the galvanized steel pipe is polished by the polishing wheel (8), the two clamping arm frames (9) rotate to both sides of the galvanized steel pipe, and at this time the push plate (15) is set above the galvanized steel pipe.

10. A laser welding machine for repairing galvanized steel pipes according to claim 5, characterized in that, The welding position on the galvanized steel pipe is in contact with the push plate (15), the push plate (15) is set in an arc shape, and the push plate (15) is in close contact with the galvanized steel pipe.

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