Positioning device and method for steel structural bridge H-shaped steel part

Abstract

The present application belongs to the technical field of H-shaped steel production, and particularly relates to a positioning device for H-shaped steel of a steel structure bridge, comprising a machining table, wherein an electric conveyor is installed on the machining table, two first support frames are fixedly connected to the machining table, a first rotating seat is arranged on each first support frame, and a gear ring is rotatably connected to the first rotating seat; and a rapid positioning assembly is arranged on the machining table. The present application can drive two wing plates to be positioned and fixed synchronously with a web, reduces positioning operation steps in H-shaped steel production, improves the overall efficiency of batch production of H-shaped steel, exposes the side to be welded of the wing plate of the H-shaped steel to the upper part, thereby facilitating observation and adjustment of a welding position by a worker, and drives a welding gun to ascend and descend, so that the welding gun can adapt to the space required by rotation of the H-shaped steel, ensures stability of the welding gun equipment, and reduces the use cost of the welding gun equipment.

Description

A positioning device and method for I-beam steel components in steel structure bridges Technical Field

[0001] This invention belongs to the field of I-beam steel component manufacturing technology, and in particular relates to a positioning device and method for I-beam steel components of steel structure bridges. Background Technology

[0002] Steel structure bridges refer to steel-framed bridges whose load-bearing structures are made of steel. Steel structure bridges have a relatively simple structure and a short construction period, so they are often used for short-span bridges, temporary bridges, or bridges in special terrains. In steel structure bridges, the main function of I-beams is to support and fix the bridge deck. Compared with traditional channel steel, I-beams use lower cost steel materials and have higher structural strength.

[0003] However, existing positioning devices and methods for I-beams used in steel structure bridges often have the following problems when in use:

[0004] In the mass production of I-beams, it is usually necessary to weld two flanges to the web plate in sequence. That is, firstly, one flange is positioned and welded to the web plate, and then the T-shaped plate formed above is positioned and welded to the other flange. This process requires two positioning operations for welding and assembly, which increases the positioning operation steps in the production of I-beams and affects the overall efficiency of mass production of I-beams.

[0005] Since there are two welding points between the flange side and the web in the I-beam steel component, multiple welding operations are required for the flange and web in the case of manual welding, which results in high labor costs. If too many welding guns are used to weld the flange and web simultaneously, the equipment cost of the welding guns will also increase, and it will be inconvenient for workers to observe and adjust the weld during welding. Summary of the Invention

[0006] The purpose of this invention is to address the problems in the production technology of I-beam steel components mentioned in the background section by providing a positioning device and method for I-beam steel components in steel structure bridges.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a positioning device for I-beams in steel structure bridges, comprising:

[0008] A processing table, on which an electric conveyor is installed, and two first support frames are fixedly connected to the processing table. Each first support frame is provided with a first rotating seat, and a toothed ring is rotatably connected to the first rotating seat.

[0009] A quick positioning assembly includes a support plate, an electric push rod, an adapter block, a sliding groove, a sliding rod, a tension spring, a clamping block, a through hole, a through slot, and an electric scissor lift platform. The support plate is fixedly connected between two toothed rings. The electric push rod is installed inside the support plate. The adapter block is fixedly connected to the output end of the electric push rod. The sliding groove is formed on the adapter block. The sliding rod is slidably connected inside the sliding groove. The tension spring is fitted onto the outer wall of the sliding rod. The clamping block is fixedly connected to the end of the sliding rod. The through hole is formed on the conveyor belt of the electric conveyor. The through slot is formed inside the electric conveyor. The electric scissor lift platform is installed inside the through slot.

[0010] The processing table is equipped with a rotation drive component, and a welding torch adjustment assembly is located above the two toothed rings on the processing table.

[0011] Furthermore, the rotation drive component includes a second support frame, a stepper motor, a rotating shaft, and a rotating bracket. The second support frame is fixedly connected to the processing table, the stepper motor is fixedly connected to the second support frame, the rotating bracket is fixedly connected to the inner side of the gear ring, the rotating shaft is fixedly connected to the middle of the rotating bracket, and the rotating shaft is rotatably connected to the first rotating seat. One end of the rotating shaft is fixedly connected to the output end of the stepper motor via a coupling.

[0012] Furthermore, the welding torch adjustment assembly includes two third support frames, a support plate, a second rotating seat, a worm gear, two transmission gears, two bidirectional screws, and a worm wheel. The third support frames are fixedly connected to the processing table, the support plate is fixedly connected between the two third support frames, the second rotating seat is fixedly connected to the third support frame, the worm gear is rotatably connected to the second rotating seat, the two transmission gears are rotatably connected to both ends of the worm gear respectively, and the transmission gears mesh with the gear rings. The two bidirectional screws are rotatably connected to the support plate, and the worm wheel is fixedly connected to one of the bidirectional screws, and the worm wheel meshes with the worm gear.

[0013] Furthermore, the welding torch adjustment assembly also includes two drive wheels, a drive belt, a nut, an adjustment plate, several guide rods, an electric slide rail, a slider, and a welding torch. The two drive wheels are respectively fixedly connected to the ends of two bidirectional screws, and the two drive wheels are connected by a drive belt. The nut is threadedly connected to the bidirectional screws, the adjustment plate is fixedly connected to the nut, several guide rods are fixedly connected to the adjustment plate, and several guide rods pass through the support plate. The electric slide rail is fixedly connected to the lower ends of several guide rods, the slider is slidably connected to the electric slide rail, and the welding torch is fixedly connected to the slider.

[0014] Furthermore, a sliding hole is provided on the support plate, and the guide rod is slidably connected to the sliding hole.

[0015] Furthermore, the two ends of the tension spring are fixedly connected to the adapter block and the clamping block respectively, and the tension spring is an alloy steel spring with a high elastic coefficient.

[0016] Furthermore, the third support frame has a strip-shaped hole, and the transmission gear is located at the strip-shaped hole.

[0017] Furthermore, the welding torch is tilted at 45° relative to the slider.

[0018] A method for positioning I-beams in steel structure bridges includes the following steps:

[0019] S1: First, attach the two wing plates to the adapter block, and fix the wing plates with two elastically set clamping blocks. At the same time, the electric conveyor transports the web plate to directly below the two wing plates. Simultaneously, the electric push rod and the electric scissor lift are activated, so that the two wing plates move towards each other and are simultaneously positioned and fixed with the web plate.

[0020] S2: Start the stepper motor, which drives the two toothed rings, two electric push rods, and the welded I-shaped steel part on one side of the wing plate to rotate 180°, so that the wing plate to be welded on one side rotates to the top, making it easier to observe the welding process.

[0021] S3: During the rotation of the I-shaped steel part, the welding torch is driven to move up and down synchronously, so that the welding torch can adapt to the space required for the rotation of the I-shaped steel part and ensure the stability of the welding torch.

[0022] The present invention has the following advantages:

[0023] The present invention includes a rapid positioning component, which drives two wing plates to move via two electric push rods and drives the web plate to rise via an electric scissor lift, so that the two wing plates can be positioned and fixed synchronously with the web plate, reducing the positioning operation steps in the production of I-beams and improving the overall efficiency of mass production of I-beams.

[0024] The present invention includes a rotation drive component that drives two gear rings to rotate, thereby causing two electric push rods to rotate the I-shaped steel part on one side of the welded wing plate by 180°. This exposes the upper part of the wing plate to be welded in the I-shaped steel part, making it easier for workers to observe and adjust the welding area.

[0025] The present invention includes a welding torch adjustment component, which can synchronously drive the welding torch to rise and fall during the 180° rotation of the I-shaped steel part. This allows the welding torch to adapt to the space required for the rotation of the I-shaped steel part during automatic welding, ensuring the stability of the welding torch equipment without using too many welding torches, and reducing the cost of using welding torch equipment in the mass production of I-shaped steel parts. Attached Figure Description

[0026] Figure 1 is a left-side three-dimensional structural schematic diagram of a positioning device for steel structure bridge I-beams provided by the present invention;

[0027] Figure 2 is an enlarged view of point A in Figure 1;

[0028] Figure 3 is an enlarged view of point B in Figure 1;

[0029] Figure 4 is an enlarged view of point C in Figure 1;

[0030] Figure 5 is a three-dimensional cross-sectional view of the rapid positioning component in a positioning device for steel structural bridge components provided by the present invention.

[0031] Figure 6 is a three-dimensional structural diagram of the right side of a positioning device for I-beams in a steel structure bridge provided by the present invention;

[0032] Figure 7 is an enlarged view of point D in Figure 6;

[0033] Figure 8 is a flowchart illustrating a method for positioning steel components of a steel structure bridge provided by the present invention.

[0034] In the diagram, 1 is a processing table, 2 is an electric conveyor, 3 is a first support frame, 4 is a first rotating seat, 5 is a gear ring, 6 is a support plate, 7 is an electric push rod, 8 is a transition block, 9 is a sliding groove, 10 is a sliding rod, 11 is a tension spring, 12 is a clamping block, 13 is a through hole, 14 is a through groove, 15 is an electric scissor lift, 16 is a second support frame, 17 is a stepper motor, 18 is a rotating shaft, 19 is a rotating bracket, 20 is a third support frame, 21 is a support plate, 22 is a second rotating seat, 23 is a worm gear, 24 is a transmission gear, 25 is a double-acting screw, 26 is a worm wheel, 27 is a transmission wheel, 28 is a transmission belt, 29 is a nut, 30 is an adjusting plate, 31 is a guide rod, 32 is an electric slide rail, 33 is a slider, 34 is a welding torch, and 35 is a strip hole. Detailed Implementation

[0035] As shown in Figures 1, 2, 5, and 6, a positioning device for steel structural bridge I-beams includes a processing table 1 and a rapid positioning assembly. An electric conveyor 2 is mounted on the processing table 1, and two first support frames 3 are fixedly connected to the processing table 1. Each first support frame 3 is equipped with a first rotating seat 4, and a toothed ring 5 is rotatably connected to the first rotating seat 4. The rapid positioning assembly includes a support plate 6, an electric push rod 7, a transition block 8, a sliding groove 9, a sliding rod 10, a tension spring 11, a clamping block 12, a through hole 13, a through groove 14, and an electric... The scissor lift platform 15 has a support plate 6 fixedly connected between two toothed rings 5, an electric push rod 7 installed inside the support plate 6, an adapter block 8 fixedly connected to the output end of the electric push rod 7, a sliding groove 9 opened on the adapter block 8, a sliding rod 10 slidably connected inside the sliding groove 9, a tension spring 11 fitted on the outer wall of the sliding rod 10, a clamping block 12 fixedly connected to the end of the sliding rod 10, a through hole 13 opened on the conveyor belt of the electric conveyor 2, a through groove 14 opened inside the electric conveyor 2, and the electric scissor lift platform 15 installed inside the through groove 14.

[0036] In the mass production of I-beams, the two wing plates are first placed at the transition blocks 8 on the output ends of the two electric push rods 7, so that the wing plates are in contact with the transition blocks 8. Then, the tension spring 11 pulls the two clamping blocks 12 to move towards each other, so that the two clamping blocks 12 fix the wing plates. At this time, the electric conveyor 2 transports the web plate to the area directly below the two wing plates. The electric scissor lift 15 drives the web plate to rise. When the two wing plates are in contact with the web plate, the middle part of the wing plate is just fixed with the side plate of the web plate. By synchronously driving the two wing plates to move towards each other and positioning and fixing them synchronously with the web plate, the positioning operation steps in the production of I-beams can be reduced, and the overall efficiency of mass production of I-beams can be improved.

[0037] As shown in Figures 1, 4, 5 and 6, a rotation drive component is provided on the processing table 1. The rotation drive component includes a second support frame 16, a stepper motor 17, a rotating shaft 18 and a rotating bracket 19. The second support frame 16 is fixedly connected to the processing table 1, the stepper motor 17 is fixedly connected to the second support frame 16, the rotating bracket 19 is fixedly connected to the inner side of the gear ring 5, the rotating shaft 18 is fixedly connected to the middle of the rotating bracket 19, and the rotating shaft 18 is rotatably connected to the first rotating seat 4. One end of the rotating shaft 18 is fixedly connected to the output end of the stepper motor 17 through a coupling.

[0038] After the welding torch 34 automatically welds the upper wing plate side and web plate, the stepper motor 17 is started. The output of the stepper motor 17 drives the rotating shaft 18 to rotate, which in turn causes the rotating bracket 19 and the toothed ring 5 to rotate synchronously. Since the two toothed rings 5 ​​are connected by the support plate 6, the two toothed rings 5 ​​can rotate synchronously, which in turn drives the two electric push rods 7 and the I-shaped steel part that has been welded on one side of the wing plate to rotate 180°, so that the field of vision of the wing plate on the lower side to be welded is exposed to the upper part, which makes it convenient for the staff to observe and adjust the welding area.

[0039] As shown in Figures 1, 2, 6, and 7, a welding torch adjustment assembly is installed on the processing table 1 above the two gear rings 5. The welding torch adjustment assembly includes two third support frames 20, a support plate 21, a second rotating seat 22, a worm gear 23, two transmission gears 24, two double-acting screws 25, and a worm wheel 26. The third support frames 20 are fixedly connected to the processing table 1, the support plate 21 is fixedly connected between the two third support frames 20, the second rotating seat 22 is fixedly connected to the third support frame 20, the worm gear 23 is rotatably connected to the second rotating seat 22, the two transmission gears 24 are rotatably connected to both ends of the worm gear 23, and the transmission gears 24 mesh with the gear rings 5. A slotted hole 35 is opened on the third support frame 20, and the transmission gears 24 are located at the slotted hole 35. The two double-acting screws 25 are rotatably connected to the support plate 21, and the worm wheel 26 is fixedly connected to one of the double-acting screws. On 25, and the worm gear 26 meshes with the worm 23, the welding torch adjustment assembly also includes two transmission wheels 27, a transmission belt 28, a nut 29, an adjustment plate 30, several guide rods 31, an electric slide rail 32, a slider 33 and a welding torch 34. The two transmission wheels 27 are respectively fixedly connected to the ends of the two bidirectional screws 25. The two transmission wheels 27 are connected by transmission belt 28. The nut 29 is threadedly connected to the bidirectional screw 25. The adjustment plate 30 is fixedly connected to the nut 29. Several guide rods 31 are fixedly connected to the adjustment plate 30 and pass through the support plate 21. The support plate 21 has a sliding hole. The guide rods 31 are slidably connected to the sliding hole. The electric slide rail 32 is fixedly connected to the lower end of several guide rods 31. The slider 33 is slidably connected to the electric slide rail 32. The welding torch 34 is fixedly connected to the slider 33. The welding torch 34 is inclined at 45° relative to the slider 33.

[0040] During the welding of one side of the wing plate and its 90° rotation, the gear ring 5 meshes with the transmission gear 24, causing the transmission gear 24 and the worm 23 to rotate synchronously. This causes the worm wheel 26, which meshes with the worm 23 and is rotatably connected to the support plate 21, to rotate, thereby causing one of the bidirectional screws 25 to rotate. Since the two transmission wheels 27 at the upper ends of the two bidirectional screws 25 are connected by a transmission belt 28, the other bidirectional screw 25 can rotate synchronously, causing the two nuts 29 threaded onto the two bidirectional screws 25 to rise and move, which in turn drives the guide rod 3 through the adjusting plate 30. 1. Moving upwards causes the electric slide rail 32, slider 33, and welding torch 34 at the lower end of the guide rod 31 to move upwards. At this time, the electric push rod 7 is on a vertical plane relative to the ground. As the toothed ring 5 continues to rotate to 180°, the bidirectional screw 25 continues to rotate and causes the nut 29 to move downwards, thereby causing the welding torch 34 to move downwards to return to its original welding position and automatically weld the area to be welded. This allows the welding torch 34 to adapt to the space required for the rotation of the I-shaped steel parts during automatic welding, ensuring the stability of the welding torch 34 without using too many welding torches, and reducing the cost of using welding torch equipment in the mass production of I-shaped steel parts.

[0041] As shown in Figure 8, a method for positioning I-beams in a steel structure bridge includes the following steps:

[0042] S1: First, attach the two wing plates to the adapter block 8, and fix the wing plates with the two elastically set clamping blocks 122. At the same time, the electric conveyor 2 transports the web plate to directly below the two wing plates. Simultaneously, the electric push rod 7 and the electric scissor lift 15 are activated, so that the two wing plates move towards each other and are simultaneously positioned and fixed with the web plate.

[0043] S2: Start the stepper motor 17, which drives the two toothed rings 5, the two electric push rods 7, and the welded I-shaped steel parts on one side of the wing plate to rotate 180°, so that the one side of the wing plate to be welded rotates to the top, making it easier to observe the welding situation.

[0044] S3: During the rotation of the I-shaped steel part, the welding torch 34 is driven to move up and down synchronously, so that the welding torch 34 can adapt to the space required for the rotation of the I-shaped steel part and ensure the stability of the welding torch 34.

[0045] The working principle of this invention is as follows:

[0046] 1. In the mass production process of I-beams, the two wing plates are first placed at the positions of the transition blocks 8 on the output ends of the two electric push rods 7, so that the wing plates are in contact with the transition blocks 8. Then, the tension spring 11 pulls the two clamping blocks 12 to move towards each other, so that the two clamping blocks 12 fix the wing plates. At this time, the electric conveyor 2 transports the web plate to the area directly below the two wing plates. The electric scissor lift 15 drives the web plate to rise. When the two wing plates are in contact with the web plate, the middle part of the wing plate is just fixed with the side plate of the web plate. By synchronously driving the two wing plates to move towards each other and positioning and fixing them synchronously with the web plate, the positioning operation steps in the production of I-beams can be reduced, and the overall efficiency of the mass production of I-beams can be improved.

[0047] 2. After the welding torch 34 automatically welds the upper wing plate side and web plate, the stepper motor 17 is started. The output end of the stepper motor 17 drives the rotating shaft 18 to rotate, which in turn causes the rotating bracket 19 and the toothed ring 5 to rotate synchronously. Since the two toothed rings 5 ​​are connected by the support plate 6, the two toothed rings 5 ​​can rotate synchronously, which in turn drives the two electric push rods 7 and the I-shaped steel part that has been welded on one side of the wing plate to rotate 180°, so that the field of vision of the wing plate on the lower side to be welded is exposed to the upper part, which makes it convenient for the staff to observe and adjust the welding point.

[0048] 3. During the welding of one side of the wing plate and its 90° rotation, the gear ring 5 meshes with the transmission gear 24, causing the transmission gear 24 and the worm 23 to rotate synchronously. This causes the worm wheel 26, which meshes with the worm 23 and is rotatably connected to the support plate 21, to rotate, thereby causing one of the double-acting screws 25 to rotate. Since the two transmission wheels 27 at the upper ends of the two double-acting screws 25 are connected by the transmission belt 28, the other double-acting screw 25 can rotate synchronously, causing the two nuts 29 threaded onto the two double-acting screws 25 to rise and move, which in turn drives the guide rod through the adjusting plate 30. The upward movement of guide rod 31 causes the electric slide rail 32, slider 33, and welding torch 34 at the lower end of guide rod 31 to move upward. At this time, the electric push rod 7 is on a vertical plane relative to the ground. As the toothed ring 5 continues to rotate to 180°, the bidirectional screw 25 continues to rotate and causes the nut 29 to move downward, thereby causing the welding torch 34 to move downward and return to the original welding position, and automatically weld the area to be welded. This allows the welding torch 34 to adapt to the space required for the rotation of the I-shaped steel parts during automatic welding, ensuring the stability of the welding torch 34 without using too many welding torches, and reducing the cost of using welding torch equipment in the mass production of I-shaped steel parts.

Claims

1. A positioning device for I-beams in steel structure bridges, characterized in that, include: A processing table (1) is equipped with an electric conveyor (2). Two first support frames (3) are fixedly connected to the processing table (1). Each first support frame (3) is provided with a first rotating seat (4). A toothed ring (5) is rotatably connected to the first rotating seat (4). A quick positioning assembly is provided with a support plate (6), an electric push rod (7), a transition block (8), a sliding groove (9), a sliding rod (10), a tension spring (11), a clamping block (12), a through hole (13), a through groove (14), and an electric scissor lift (15). 15), the support plate (6) is fixedly connected between the two toothed rings (5), the electric push rod (7) is installed on the inner side of the support plate (6), the adapter block (8) is fixedly connected to the output end of the electric push rod (7), the sliding groove (9) is opened on the adapter block (8), the sliding rod (10) is slidably connected in the sliding groove (9), the tension spring (11) is fitted on the outer wall of the sliding rod (10), the clamping block (12) is fixedly connected to the end of the sliding rod (10), the through hole (13) is opened on the conveyor belt of the electric conveyor (2), and the through groove (14) The electric scissor lift (15) is installed inside the electric conveyor (2) and is installed in the through groove (14); the processing table (1) is provided with a rotating drive component, and the processing table (1) is provided with a welding torch adjustment assembly above the two gear rings (5); the welding torch adjustment assembly includes two third support frames (20), a support plate (21), a second rotating seat (22), a worm gear (23), two transmission gears (24), two double-acting screws (25) and a worm wheel (26), the third support frame (20) is fixedly connected to the processing table (1), and the support plate (22) ... fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame (20) and the second rotating seat (25) is fixedly connected to the third support frame 1) Fixedly connected between two third support frames (20), the second rotating seat (22) is fixedly connected to the third support frame (20), the worm (23) is rotatably connected to the second rotating seat (22), the two transmission gears (24) are rotatably connected to the two ends of the worm (23), the transmission gears (24) mesh with the gear ring (5), the two bidirectional screws (25) are rotatably connected to the support plate (21), the worm wheel (26) is fixedly connected to one of the bidirectional screws (25), and the worm wheel (26) meshes with the worm (23);The welding torch adjustment assembly also includes two drive wheels (27), a drive belt (28), a nut (29), an adjustment plate (30), several guide rods (31), an electric slide rail (32), a slider (33), and a welding torch (34). The two drive wheels (27) are respectively fixedly connected to the ends of two bidirectional screws (25), and the two drive wheels (27) are connected by the drive belt (28). The nut (29) is threadedly connected to the bidirectional screw (25). The adjustment plate (30) is fixedly connected to the nut (29). Several guide rods (31) are fixedly connected to the adjustment plate (30), and several guide rods (31) pass through the support plate (21). The electric slide rail (32) is fixedly connected to the lower end of several guide rods (31). The slider (33) is slidably connected to the electric slide rail (32). The welding torch (34) is fixedly connected to the slider (33).

2. The positioning device for I-beams in a steel structure bridge according to claim 1, characterized in that, The rotation drive component includes a second support frame (16), a stepper motor (17), a rotating shaft (18), and a rotating bracket (19). The second support frame (16) is fixedly connected to the processing table (1). The stepper motor (17) is fixedly connected to the second support frame (16). The rotating bracket (19) is fixedly connected to the inner side of the gear ring (5). The rotating shaft (18) is fixedly connected to the middle part of the rotating bracket (19). The rotating shaft (18) is rotatably connected to the first rotating seat (4). One end of the rotating shaft (18) is fixedly connected to the output end of the stepper motor (17) through a coupling.

3. The positioning device for I-beams in a steel structure bridge according to claim 1, characterized in that, The support plate (21) has a sliding hole, and the guide rod (31) is slidably connected to the sliding hole.

4. The positioning device for I-beams in a steel structure bridge according to claim 1, characterized in that, The two ends of the tension spring (11) are fixedly connected to the adapter block (8) and the clamping block (12) respectively, and the tension spring (11) is an alloy steel spring with a high elastic coefficient.

5. A positioning device for I-beams in a steel structure bridge according to claim 1, characterized in that, The third support frame (20) has a strip hole (35), and the transmission gear (24) is located at the strip hole (35).

6. The positioning device for I-beams in a steel structure bridge according to claim 1, characterized in that, The welding torch (34) is set at a 45° angle relative to the slider (33).

7. A positioning method for a positioning device applied to the steel structure bridge steel member of any one of claims 1-6, characterized in that, The process includes the following steps: S1: First, attach the two wing plates to the adapter block (8), fix the wing plates with the two elastically set clamping blocks (12), and at the same time, the electric conveyor (2) transports the web plate to the bottom of the two wing plates. At the same time, the electric push rod (7) and the electric scissor lift (15) are started, so that the two wing plates move towards each other and are positioned and fixed with the web plate simultaneously; S2: Start the stepper motor (17), drive the two toothed rings (5) and the two electric push rods (7) and the welded I-shaped steel parts on one side of the wing plate to rotate 180°, so that the wing plate to be welded on one side rotates to the top, making it easier to observe the welding situation; S3: During the rotation of the I-shaped steel parts, the welding gun (34) is driven to move up and down, so that the welding gun (34) adapts to the space required for the rotation of the I-shaped steel parts, ensuring the stability of the welding gun (34).

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