Gantry welding machine for producing electric power steel pipe pole

Abstract

The invention relates to the technical field of gantry welding machines, and discloses a gantry welding machine for producing electric power steel pipe poles, which comprises a gantry frame, a fixed frame is fixedly mounted at the top of the inner side of the gantry frame, a rotatable rotating ring is mounted on one side of the fixed frame, and an inserting block capable of reciprocating is mounted on the rotating ring; a fixed block is fixedly installed at the end, located in the rotating ring, of the inserting block, a sliding plate capable of moving in a reciprocating mode and an inverted-U-shaped block are installed on one side of the fixed block, a laser welding gun is installed on the side, away from the second electric telescopic rod, of the inverted-U-shaped block, and a regular dodecagon groove is formed in one side of the fixed frame. A first roller located in the regular dodecagon groove is rotationally installed on the other side of the inserting block. The gantry welding machine is provided with the plasmon coil welding structure, and the plasmon coil welding structure can be adjusted according to pipe rods with different diameters and keep fixed defocus, so that stable coil welding operation is carried out, and the welding quality is effectively guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of gantry welding machines, specifically a gantry welding machine for producing power steel pipe poles. Background Technology

[0002] Power transmission steel pipe poles are important supporting structures in power transmission and transformation lines. They are assembled by welding multiple tapered steel pipe segments. Compared with traditional angle steel towers, they have the advantages of compact structure, small footprint, beautiful appearance, and strong load-bearing capacity, making them particularly suitable for space-constrained areas such as urban corridors and road crossings. Their processing and manufacturing are key links to ensure the safety and reliability of the overall structure. In the welding process, to ensure the consistency and efficiency of the penetration depth and welding quality of the multi-segment butt welds, a gantry-type automatic welding machine is usually used. This equipment, through a precise CNC system, drives the welding torch to run stably along a predetermined trajectory, which can significantly improve the forming quality of the circumferential weld, welding efficiency, and the level of production automation, thereby ensuring the overall structural strength and long-term service performance of the power transmission steel pipe pole.

[0003] Currently, the widely used power steel pipe poles are typically dodecagonal or hexagonal in shape. Furthermore, due to their variable cross-section conical design, the root diameter is larger than the top diameter, resulting in an overall conical structure. Therefore, when welding multiple sections of the same wall thickness but different diameters, it is necessary to keep the welding torch in a fixed defocused position to maintain welding quality. To address these issues, a gantry welding machine for producing power steel pipe poles needs to be designed. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a gantry welding machine for producing power steel pipe poles, comprising a gantry frame, a fixed frame fixedly installed on the top of the inner side of the gantry frame, a rotatable rotating ring installed on one side of the fixed frame, a reciprocating insert block installed on the rotating ring, a fixed block fixedly installed at the end of the insert block located inside the rotating ring, an inverted L-shaped connecting block fixedly installed on one side of the insert block, one end of the inverted L-shaped connecting block fixedly connected to the fixed block, a first electric telescopic rod installed on the outer side of the inverted L-shaped connecting block, a reciprocating sliding plate and an inverted U-shaped block installed on one side of the fixed block, the telescopic end of the first electric telescopic rod fixedly connected to the sliding plate, a second electric telescopic rod installed between the sliding plate and the inverted U-shaped block, a laser welding gun installed on the side of the inverted U-shaped block away from the second electric telescopic rod, a regular dodecagonal groove opened on one side of the fixed frame, and a roller rotatably installed inside the regular dodecagonal groove on the other side of the insert block.

[0005] Preferably, a circular groove is provided on one side of the fixed frame, and a number of rollers 2 rotate circumferentially at equal intervals on the side of the rotating ring close to the fixed frame, with the rollers 2 all installed inside the circular groove.

[0006] Preferably, an internal gear ring is fixedly installed on one side of the fixed frame, a forward and reverse motor is installed on the inner ring surface of the rotating ring, and a gear is fixedly installed at the output end of the forward and reverse motor, which meshes with the internal gear ring.

[0007] Preferably, the rotating ring has a mounting hole, and the plug is movably inserted into the mounting hole with the plug facing the center of the rotating ring.

[0008] Preferably, a mounting groove is provided on one side of the fixing block, and two slide rods are symmetrically fixedly installed inside the mounting groove. One side of the slide plate is slidably sleeved between the surfaces of the two slide rods, and the two ends of the inverted U-shaped block are slidably sleeved on the surfaces of the two slide rods respectively.

[0009] Preferably, a vertical rod is fixedly installed on the side of the skateboard away from the first electric telescopic rod, and an abutment roller is rotatably installed on the end of the vertical rod away from the skateboard, with the vertical rod passing through the inside of the inverted U-shaped block.

[0010] Preferably, a cable winding wheel is rotatably mounted on the end of the insert block away from the fixed block via two bearings. The surface of the cable winding wheel is wound with a power cord. A gear two is fixedly mounted on the end of the cable winding wheel away from the insert block. An external gear ring is fixedly mounted on one side of the fixed frame. The gear two meshes with the external gear ring.

[0011] Preferably, a wire is installed in the middle of the cable winding reel, one end of which is connected to one end of the power cord, and a conductive groove is provided at the other end of the cable winding reel. A wire block is fixedly installed inside the conductive groove, and the other end of the wire is connected to the wire block.

[0012] Preferably, an inverted L-shaped tube is rotatably installed inside the conductive groove via a bearing. A second wire block is fixedly installed at the end of the inverted L-shaped tube inside the conductive groove. The second wire block abuts against the first wire block. A power transmission line is fixedly installed inside the inverted L-shaped tube. One end of the power transmission line is connected to the second wire block, and the other end of the power transmission line is connected to the laser welding gun.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) This gantry welding machine has a plasma focus winding welding structure. The plasma focus winding welding structure can be adjusted and kept fixed according to the pipe rods of different diameters, so as to carry out stable winding welding operation and effectively ensure the welding quality. At the same time, the plasma focus winding welding structure is simple in design, easy to adjust, and the plasma focus winding welding is stable and reliable. Its performance can meet the processing and use requirements of power steel pipe pole welding production. When it is necessary to adjust the welding radius of the laser welding gun, the first electric telescopic rod is activated to extend and push the slide plate to move. The movement of the slide plate will synchronously drive the inverted U-shaped block to move through the second electric telescopic rod. The movement of the inverted U-shaped block will drive the laser welding gun to move, thereby adjusting the welding radius of the laser welding gun. When it is necessary to adjust the welding defocus of the laser welding gun, first adjust the welding radius of the laser welding gun, then align the laser welding gun with the weld seam, and then activate the second electric telescopic rod to extend and push the inverted U-shaped block and the laser welding gun to move, so that the laser welding gun moves toward the electric steel pipe pole to adjust the welding defocus; (2) At the same time, this gantry welding machine has a power cord winding and welding winding structure. This power cord winding and welding winding structure can effectively wind and unwind the power cord, thereby effectively ensuring the reliability of the winding welding operation. When the insert block rotates in a circle, it drives the cable winding wheel and gear two to rotate in a circle. The rotation of gear two causes it to roll on the outer gear ring, which in turn drives the cable winding wheel to rotate. This causes the cable winding wheel to rotate during its rotation, allowing it to adjust the winding and unwinding of the power cable. The unwound power cable is located on the outer surface of the outer gear ring. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0015] In the attached diagram: Figure 1 This is a front view schematic diagram of the gantry welding machine used for producing power steel pipe poles according to the present invention; Figure 2 This is a front view of the fixing frame of the present invention. Figure 3 For the present invention Figure 1 Schematic diagram of local structure Figure 1 ; Figure 4 For the present invention Figure 3 A schematic diagram of the rear view structure; Figure 5 This is a schematic diagram of the orthographic structure of the rotating ring of the present invention; Figure 6 This is a rear view schematic diagram of the rotating ring structure of the present invention; Figure 7 For the present invention Figure 3 A partial structural diagram; Figure 8 For the present invention Figure 7 A partial structural diagram; Figure 9 For the present invention Figure 3 A schematic diagram of a partial side profile; Figure 10 This is a partial side cross-sectional view of the rotating ring of the present invention; In the diagram: 1. Gantry frame; 2. Fixed frame; 3. Rotating ring; 4. Insert block; 5. Fixed block; 6. Inverted L-shaped connecting block; 7. First electric telescopic rod; 8. Slide plate; 9. Inverted U-shaped block; 10. Second electric telescopic rod; 11. Laser welding gun; 12. Regular dodecagonal groove; 13. Roller one; 14. Ring groove; 15. Roller two; 16. Internal gear ring; 17. Forward and reverse motor; 18. Gear one; 19. Mounting hole; 20. Mounting groove; 21. Slide rod; 22. Vertical rod; 23. Contact roller; 24. Cable winding wheel; 25. Power cord; 26. Gear two; 27. External gear ring; 28. Wire; 29. ​​Conductive groove; 30. Wire block one; 31. Inverted L-shaped conduit; 32. Wire block two; 33. Power transmission line. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Example 1, by Figures 1 to 10 The present invention includes a gantry frame 1, which includes an n-shaped column. Each end of the n-shaped column is provided with a first roller assembly. Each first roller assembly includes two first rollers spaced apart in the front-back direction and whose axes extend in the left-right direction. Below each first roller is a first slide rail extending in the front-back direction. The gantry frame 1 is slidably mounted on the two first slide rails in the front-back direction. A drive mechanism is provided on the outer side of each n-shaped column. The drive mechanism includes a motor and a reducer. The motor and reducer are existing technologies and will not be described in detail here. The power output shaft of the drive mechanism is vertically arranged and a gear is coaxially arranged. The gantry frame 1 is slidably mounted on the two first slide rails in the front-back direction. A rack is vertically arranged on the outer side of each first slide rail. The gear meshes with the rack. The drive mechanism drives the gear to rotate, and the gear meshes with the rack, thereby driving the gantry frame 1 to slide back and forth on the first slide rails.

[0018] A fixed frame 2 is fixedly installed on the top of the inner side of the gantry frame 1. The fixed frame 2 is fixedly installed on the top of the inner side of the n-shaped column. A circular through-hole is opened in the middle of the fixed frame 2. A rotatable rotating ring 3 is installed on one side of the fixed frame 2. The rotating ring 3 is concentric with the circular through-hole. A reciprocating insert 4 is installed on the rotating ring 3. A fixed block 5 is fixedly installed on the end of the insert 4 inside the rotating ring 3. An inverted L-shaped connecting block 6 is fixedly installed on one side of the insert 4. One end of the inverted L-shaped connecting block 6 is fixedly connected to the fixed block 5. One side of the rotating ring 3 is located inside the inverted L-shaped connecting block 6. A first electric telescopic rod 7 is installed on the outside of the inverted L-shaped connecting block 6. A reciprocating sliding plate 8 and an inverted U-shaped block 9 are installed on one side of the fixed block 5. The telescopic end of the first electric telescopic rod 7 is fixedly connected to the sliding plate 8. A second electric telescopic rod 10 is installed between the sliding plate 8 and the inverted U-shaped block 9. The inverted U-shaped block 9 is away from the second electric telescopic rod 10. A laser welding gun 11 is installed on one side of the retractable rod 10, and a regular dodecagonal groove 12 is provided on one side of the fixed frame 2. The regular dodecagonal groove 12 is set with the same center as the rotating ring 3. A roller 13 located inside the regular dodecagonal groove 12 is rotatably installed on the other side of the insert block 4. When the rotating ring 3 rotates, the rotating ring 3 will drive the insert block 4, the fixed block 5, the sliding plate 8, the inverted U-shaped block 9 and the laser welding gun 11 to rotate. During the rotation of the insert block 4, the roller 13 will rotate in a circle, so that the roller 13 moves in a regular dodecagonal trajectory inside the regular dodecagonal groove 12. The regular dodecagonal trajectory movement of the roller 13 will drive the rotating insert block 4, the fixed block 5, the sliding plate 8, the inverted U-shaped block 9 and the laser welding gun 11 to move in a regular dodecagonal trajectory in a circle, so that the laser welding gun 11 can effectively perform isofocused circular welding operation on the regular dodecagonal power steel pipe pole.

[0019] This gantry welding machine features a plasma-focused coil welding structure. This structure can adjust and maintain a fixed defocus according to pipes of different diameters, thus enabling stable coil welding operations and effectively ensuring welding quality. Furthermore, the plasma-focused coil welding structure is simple in design, easy to adjust, and provides stable and reliable welding. Its performance meets the processing and usage requirements of power steel pipe pole welding production.

[0020] In Example 2, based on Example 1, a circular groove 14 is provided on one side of the fixed frame 2. The cross-section of the circular groove 14 has an inverted convex structure. Several rollers 15 rotate circumferentially at equal intervals on the side of the rotating ring 3 near the fixed frame 2. The rollers 15 are all installed inside the circular groove 14, thereby effectively installing the rotating ring 3. An internal gear ring 16 is fixedly installed on one side of the fixed frame 2. The internal gear ring 16 is concentric with the circular through-hole. A forward and reverse motor 17 is installed on the inner surface of the rotating ring 3. A gear 18 is fixedly installed at the output end of the forward and reverse motor 17. The gear 18 meshes with the internal gear ring 16, thereby effectively adjusting the rotation of the rotating ring 3. An installation hole 19 is provided on the rotating ring 3. The plug 4 is movably inserted into the installation hole 19, and the plug 4 faces the center of the rotating ring 3, thereby effectively installing the plug 4 and enabling the plug 4 to move and adjust effectively.

[0021] Specifically, two electric steel pipe poles of different diameters are joined together and passed through a circular through-hole, so that the gap between the two electric steel pipe poles is located directly below the laser welding gun 11, and the two electric steel pipe poles are supported by an external support structure, while the center of the two electric steel pipe poles coincides with the center of the circular through-hole. Next, the forward and reverse motor 17 is started to make gear 18 rotate. The rotation of gear 18 will roll on the internal gear ring 16 and drive the rotating ring 3 to rotate. The rotation of the rotating ring 3 is achieved by the roller 2 15 rolling inside the ring groove 14. The rotation of the rotating ring 3 will drive the insert block 4, the fixing block 5, the slide plate 8, the inverted U-shaped block 9 and the laser welding gun 11 to rotate. Simultaneously, the rotation of the rotating ring 3 will cause the insert block 4, the fixing block 5, the sliding plate 8, the inverted U-shaped block 9, and the laser welding gun 11 to rotate. During the rotation of the insert block 4, the roller 13 will rotate in a circle, so that the roller 13 will move in a regular dodecagonal trajectory inside the regular dodecagonal groove 12. The regular dodecagonal trajectory movement of the roller 13 will cause the rotating insert block 4, the fixing block 5, the sliding plate 8, the inverted U-shaped block 9, and the laser welding gun 11 to move in a regular dodecagonal trajectory, so that the laser welding gun 11 can effectively perform isofocused circular welding operation on the joint of the two mating regular dodecagonal power steel pipe poles.

[0022] In Example 3, based on Example 1, a mounting groove 20 is provided on one side of the fixing block 5. Two sliding rods 21 are symmetrically fixedly installed inside the mounting groove 20. One side of the sliding plate 8 is slidably sleeved between the surfaces of the two sliding rods 21. The two ends of the inverted U-shaped block 9 are respectively slidably sleeved on the surfaces of the two sliding rods 21, thereby effectively adjusting the welding radius and defocus of the laser welding gun 11. A vertical rod 22 is fixedly installed on the side of the sliding plate 8 away from the first electric telescopic rod 7. A contact roller 23 is rotatably installed on the end of the vertical rod 22 away from the sliding plate 8. The vertical rod 22 passes through the inside of the inverted U-shaped block 9. Thus, the arrangement of the vertical rod 22 and the contact roller 23 ensures that before adjusting the welding radius and defocus of the laser welding gun 11, the contact roller 23 contacts the electric steel pipe pole first, thereby enabling precise adjustment of the welding radius and defocus.

[0023] Specifically, because the power steel pipe pole adopts a variable cross-section conical design, its root diameter is larger and its top diameter is smaller, forming an overall conical structure. Therefore, the welding radius of the laser welding gun 11 is different when welding power steel pipe poles at different locations. At the same time, because the wall thickness of power steel pipe poles with different requirements is different, the welding defocus of the laser welding gun 11 is also different. When it is necessary to adjust the welding radius of the laser welding gun 11, the first electric telescopic rod 7 is activated to extend and push the slide plate 8 to move. The movement of the slide plate 8 will drive the inverted U-shaped block 9 to move synchronously through the second electric telescopic rod 10. The movement of the inverted U-shaped block 9 will drive the laser welding gun 11 to move, thereby adjusting the welding radius of the laser welding gun 11. When it is necessary to adjust the welding defocus of the laser welding gun 11, first adjust the welding radius of the laser welding gun 11, then align the laser welding gun 11 with the weld seam, and then activate the extension of the second electric telescopic rod 10 to push the inverted U-shaped block 9 and the laser welding gun 11 to move, so that the laser welding gun 11 moves toward the electric steel pipe pole to adjust the welding defocus; the wall thickness of the regular dodecagonal electric steel pipe pole is usually between 4 mm and 25 mm. Electric steel pipe poles between 4 mm and 25 mm are welded using a negative defocus method, with a defocus range between -2 mm and -5 mm; precise adjustment can be achieved by controlling the first electric telescopic rod 7 and the second electric telescopic rod 10 through an external controller.

[0024] In Example 4, based on Example 1, a cable winding wheel 24 is rotatably mounted on the end of the insert block 4 away from the fixed block 5 via two bearings. A power cord 25 is wound around the surface of the cable winding wheel 24 and is connected to an external power source. A gear 26 is fixedly mounted on the end of the cable winding wheel 24 away from the insert block 4. An external gear ring 27 is fixedly mounted on one side of the fixed frame 2. The external gear ring 27 is concentric with the circular through-hole. The gear 26 meshes with the external gear ring 27. A wire 28 is installed in the middle of the cable winding wheel 24. One end of the wire 28 is connected to one end of the power cord 25. A conductive groove 29 is opened at the other end of the cable winding wheel 24. A wire block 30 is fixedly installed inside the conductive groove 29. The other end of the wire 28 is connected to the wire block 30.

[0025] Inside the conductive groove 29, an inverted L-shaped tube 31 is rotatably mounted via a bearing. A second wire block 32 is fixedly mounted at the end of the inverted L-shaped tube 31 inside the conductive groove 29. The second wire block 32 abuts against the first wire block 30. A power transmission line 33 is fixedly mounted inside the inverted L-shaped tube 31. One end of the power transmission line 33 is connected to the second wire block 32, and the other end of the power transmission line 33 is connected to the laser welding gun 11. The length of the power transmission line 33 is sufficient for the laser welding gun 11 to adjust the welding radius and defocus, thereby effectively ensuring that the laser welding gun 11 is energized for circular welding operations.

[0026] Specifically, when the insert block 4 rotates in a circle, it drives the cable winding wheel 24 and the gear 26 to rotate in a circle. The rotation of the gear 26 causes it to roll on the outer gear ring 27. The rolling movement of the gear 26 drives the cable winding wheel 24 to rotate, so that the cable winding wheel 24 rotates during the rotation process, allowing the cable winding wheel 24 to adjust the winding and unwinding of the power cable 25. The unwound power cable 25 is located on the outer ring surface of the outer gear ring 27.

[0027] This gantry welding machine features a power cord winding and unwinding structure. This structure effectively winds and unwinds the power cord, ensuring the reliability of the winding welding operation.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gantry welding machine for producing power steel pipe poles, comprising a gantry frame (1), characterized in that: A fixed frame (2) is fixedly installed on the top of the inner side of the gantry frame (1). A rotatable rotating ring (3) is installed on one side of the fixed frame (2). A reciprocating insert (4) is installed on the rotating ring (3). A fixed block (5) is fixedly installed at the end of the insert (4) inside the rotating ring (3). An inverted L-shaped connecting block (6) is fixedly installed on one side of the insert (4). One end of the inverted L-shaped connecting block (6) is fixedly connected to the fixed block (5). A first electric telescopic rod (7) is installed on the outside of the inverted L-shaped connecting block (6). A reciprocating sliding plate (8) and an inverted U-shaped block (9) are installed on one side of the plate. The telescopic end of the first electric telescopic rod (7) is fixedly connected to the sliding plate (8). A second electric telescopic rod (10) is installed between the sliding plate (8) and the inverted U-shaped block (9). A laser welding gun (11) is installed on the side of the inverted U-shaped block (9) away from the second electric telescopic rod (10). A regular dodecagonal groove (12) is opened on one side of the fixed frame (2). A roller (13) located inside the regular dodecagonal groove (12) is rotatably installed on the other side of the insert (4).

2. The gantry welding machine for producing power steel pipe poles according to claim 1, characterized in that: The fixed frame (2) has a circular groove (14) on one side. The rotating ring (3) rotates a number of rollers (15) at equal distances on the side close to the fixed frame (2). The rollers (15) are all installed inside the circular groove (14).

3. A gantry welding machine for producing power steel pipe poles according to claim 2, characterized in that: An internal gear ring (16) is fixedly installed on one side of the fixed frame (2), and a forward and reverse motor (17) is installed on the inner ring surface of the rotating ring (3). A gear (18) is fixedly installed at the output end of the forward and reverse motor (17), and the gear (18) meshes with the internal gear ring (16).

4. A gantry welding machine for producing power steel pipe poles according to claim 3, characterized in that: The rotating ring (3) has an installation hole (19), and the plug (4) is movably inserted into the installation hole (19), with the plug (4) facing the center of the rotating ring (3).

5. A gantry welding machine for producing power steel pipe poles according to claim 1, characterized in that: The fixing block (5) has an installation groove (20) on one side. Two slide rods (21) are symmetrically fixed inside the installation groove (20). One side of the slide plate (8) is slidably sleeved between the surfaces of the two slide rods (21). The two ends of the inverted U-shaped block (9) are slidably sleeved on the surfaces of the two slide rods (21).

6. A gantry welding machine for producing power steel pipe poles according to claim 1, characterized in that: A vertical rod (22) is fixedly installed on the side of the sliding plate (8) away from the first electric telescopic rod (7). A contact roller (23) is rotatably installed on the end of the vertical rod (22) away from the sliding plate (8). The vertical rod (22) passes through the inside of the inverted U-shaped block (9).

7. A gantry welding machine for producing power steel pipe poles according to claim 1, characterized in that: The end of the insert (4) away from the fixed block (5) is rotatably mounted with a cable winding wheel (24) through two bearings. The surface of the cable winding wheel (24) is wound with a power line (25). The end of the cable winding wheel (24) away from the insert (4) is fixedly mounted with a gear two (26). An external gear ring (27) is fixedly mounted on one side of the fixed frame (2). The gear two (26) meshes with the external gear ring (27).

8. A gantry welding machine for producing power steel pipe poles according to claim 7, characterized in that: A wire (28) is installed in the middle of the cable winding reel (24). One end of the wire (28) is connected to one end of the power line (25). A conductive groove (29) is opened at the other end of the cable winding reel (24). A wire block (30) is fixedly installed inside the conductive groove (29). The other end of the wire (28) is connected to the wire block (30).

9. A gantry welding machine for producing power steel pipe poles according to claim 8, characterized in that: Inside the conductive groove (29), an inverted L-shaped tube (31) is rotatably installed via a bearing. A second wire block (32) is fixedly installed at the end of the inverted L-shaped tube (31) inside the conductive groove (29). The second wire block (32) abuts against the first wire block (30). A power transmission line (33) is fixedly installed inside the inverted L-shaped tube (31). One end of the power transmission line (33) is connected to the second wire block (32), and the other end of the power transmission line (33) is connected to the laser welding gun (11).

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