Building steel structure workpiece butt welding device

Abstract

The invention relates to the technical field of steel structure butt welding, in particular to a building steel structure workpiece butt welding device which comprises a supporting frame, a centering assembly, an adjusting assembly and a welding gun, a cantilever support is fixedly installed at one end of the supporting frame, a U-shaped groove is formed in the other end of the supporting frame and used for emptying the welding position of an anchor bar, and the centering assembly comprises a notch pipe. The notched pipe is in a vertical state and is fixedly installed at one end of the cantilever support. According to the welding device, through the arrangement of the adjusting assembly capable of revolving, the welding gun is started, the welding head revolves to continuously weld the annular welding seam, after welding is completed, the driving module drives the welding gun to reversely rotate by a circle, the welding gun is reset, the anchor bar does not need to be fixed through spot welding in the welding process, and the welding process is more continuous; in addition, the welding gun does not need to be held by hand for welding, a plurality of anchor bars can be conveniently welded to the base plate, and the welding quality and the welding efficiency of the anchor bars are improved.

Description

Technical Field

[0001] This invention relates to the field of steel structure welding technology, specifically a welding device for building steel structure workpieces. Background Technology

[0002] In civil engineering fields such as construction, bridges, and ports, embedded parts are crucial foundation components. They typically consist of a base plate and anchor bars vertically welded to it. Pre-embedded before concrete pouring, they connect and transfer loads, ensuring a reliable connection between the superstructure and the foundation. In the manufacturing process of embedded parts, the process of welding the anchor bars to the base plate is still largely carried out by small and medium-sized enterprises using traditional manual arc welding. This method involves workers holding a welding torch, relying on personal experience and visual inspection to perform spot welding and positioning one by one, followed by full welding for fixation. Embedded parts usually require welding multiple anchor bars, often in an array. Manual welding requires aligning, spot welding, and full welding one by one, making the entire process cumbersome, time-consuming, highly repetitive, and labor-intensive. During full welding, the welding head needs to be aligned with the weld seam, requiring constant adjustment of the welding torch angle, especially for circumferential welds, which is quite troublesome. Furthermore, the welding speed and angle are difficult to maintain precisely and consistently in manual welding, resulting in inconsistent weld quality. Summary of the Invention

[0003] The purpose of this invention is to provide a welding device for steel structure workpieces in construction, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A butt welding device for building steel structure workpieces, comprising:

[0006] The support frame has a cantilever frame fixedly installed at one end, and a U-shaped groove is opened at the other end of the support frame. The U-shaped groove is used to vent the welding position of the anchor bar.

[0007] The centering component includes a notched tube, which is vertical and fixedly installed at one end of a cantilever frame. The notched groove of the notched tube faces away from the cantilever frame. A movable frame is fixedly installed at the bottom end of the notched tube. A sliding frame is rotatably connected to the inner wall of the movable frame. A connecting frame is fixedly installed on the outer wall of the sliding frame. An extrusion unit is installed on the inner wall of the notched tube. The extrusion unit is used to center and limit the anchor bar to the middle position of the notched tube. A drive module is fixedly installed on the outer wall of the movable frame. The drive module is used to drive the sliding frame to rotate.

[0008] A welding gun is disposed on the outside of the notched tube, the welding gun including a welding head located at the bottom end;

[0009] An adjusting assembly is fixedly installed at one end of the connecting frame, and the welding gun is installed on the adjusting assembly, and the adjusting assembly is used to adjust the distance between the welding gun and the notch pipe.

[0010] Further, the driving module comprises a mounting piece fixedly installed on the outer side wall of the movable frame, the inner bottom surface of the mounting piece is rotationally connected with three transmission shafts, the transmission shafts are annularly and equidistantly arranged, the bottom ends of the transmission shafts are rotationally downwardly penetrated to the lower side of the mounting piece, the bottom ends of the transmission shafts are fixedly sleeved with driving gears, the top ends of the transmission shafts are fixedly sleeved with synchronous wheels, transmission belts are transmissionally connected between the middle synchronous wheel and the synchronous wheels on both sides, a driving motor is fixedly installed on the outer side wall of the notch pipe, the output end of the driving motor is transmissionally connected with one transmission shaft at the middle position, and the driving gears are transmissionally connected with the sliding frame.

[0011] Further, an incomplete tooth ring is fixedly sleeved on the outer side wall of the sliding frame, and the driving gears are meshingly transmissionally connected with the incomplete tooth ring.

[0012] Further, a plurality of guide rollers are transmissionally connected with the inner bottom surface of the mounting piece, and the guide rollers are used to guide the transmission belts.

[0013] Further, the extrusion unit comprises three rail rods two annularly and equiangularly arranged, the rail rods two are fixedly connected with the inner wall of the notch pipe, rail rods one are slidingly inserted on the rail rods two, the top ends of the three rail rods one are fixedly connected with a pressing frame, a fitting frame is arranged on one side of the rail rods two, one side wall of the fitting frame is rotationally connected with a connecting rod one and a connecting rod two, one end of the connecting rod one is rotationally connected with the inner wall of the notch pipe, and one end of the connecting rod two is rotationally connected with one side wall of the rail rod one.

[0014] Further, the other side wall of the fitting frame is an arc surface, the outer diameter of the other side wall arc surface of the fitting frame is the same as the inner diameter of the notch pipe, and the height positions of the fitting frames are mutually staggered.

[0015] Further, the pressing frame is fixedly connected with a plug rod on both sides, the outer side wall of the notch pipe is fixedly connected with a support seat on both sides, the support seat is fixedly connected with the pressing frame through a stretching spring, and the bottom end of the plug rod is slidingly inserted with the support seat on the same side.

[0016] Further, the adjusting assembly comprises a frame, one end of the frame is fixedly connected with the connecting frame, two lead screws are rotationally connected between the two side walls of the two ends of the frame, a moving seat is arranged between the two lead screws, the welding gun is fixedly installed with the moving seat, the moving seat is fixedly connected with an internal threaded seat on both sides, and the internal threaded seat is screwingly connected with the adjacent lead screw.

[0017] Furthermore, the other end of the frame is rotatably connected to a shaft, one end of the shaft is fixedly sleeved with a second transmission gear, one end of the lead screw is fixedly sleeved with a first transmission gear, the first transmission gear and the second transmission gear mesh and transmit power, and the other end of the shaft is fixedly sleeved with a handwheel.

[0018] Furthermore, the frame is offset to one side relative to the sliding frame, so that the travel angle of the welding head is between ten and fifteen degrees.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. By setting up a revolving adjustment component, the anchor bar is placed into the notch tube. The extrusion unit centers and limits the anchor bar, making it stand upright on the substrate. The distance between the welding head and the weld is adjusted by the adjustment component. Then, the welding gun is started, causing the welding head to revolve and continuously weld the circumferential weld. After welding is completed, the drive module drives the welding gun to rotate in the opposite direction once, so that the welding gun is reset. At the same time, it avoids the pipeline on the welding gun from getting tangled with the notch tube. During welding, there is no need to fix the anchor bar by spot welding first. Compared with hand-held welding gun for circumferential welding, it is more convenient. There is no need to adjust the position of the welding gun and the welding gun itself multiple times. The welding process is more continuous, thereby increasing the welding strength and quality. In addition, there is no need to hold the welding gun for welding, which makes it easy to weld multiple anchor bars onto the substrate, thereby improving the welding quality and welding efficiency of the anchor bars.

[0021] 2. With the extrusion unit, when installing the anchor bar, manually lift the pressing frame upwards. The pressing frame drives the three rail rods to slide upwards. At the same time, the pressing frame overcomes the tension of the tension spring and pulls the tension spring upwards. When the rail rod moves upwards, it drives the connecting rod to move upwards, thereby causing the connecting rod to deflect towards the inner wall of the notch tube. This causes the bonding frame to deflect upwards and outwards. Multiple bonding frames at different angles are separated from each other. After inserting the anchor bar into the notch tube, release the pressing frame. The pressing frame moves downwards under the tension of the tension spring, causing the rail rod to move downwards. The rail rod pushes the connecting rod downwards, causing multiple bonding frames to converge towards the center, thereby pushing the anchor bar and centering it in the middle position of the notch tube. Furthermore, the arrangement of multiple staggered bonding frames vertically limits the anchor bar to the base plate, facilitating the limiting and pre-fixing of the anchor bar without the need for manual support or spot welding. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall side view structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the overall usage state structure of the present invention;

[0025] Figure 4 is the schematic diagram of the notch pipe structure in the present application;

[0026] Figure 5 is the schematic diagram of the internal structure of the mounting in the present application;

[0027] Figure 6 is the schematic diagram of the bottom structure of the notch pipe in the present application;

[0028] Figure 7 is the schematic diagram of the sliding ring structure in the present application;

[0029] Figure 8 is the schematic diagram of the extrusion unit structure in the present application;

[0030] Figure 9 is the schematic diagram of the adjustment assembly structure in the present application.

[0031] In the figure: 100, support frame; 110, cantilever frame; 200, centering assembly; 210, notch pipe; 211, support seat; 220, pressing frame; 221, insertion rod; 222, tension spring; 230, extrusion unit; 231, track rod one; 232, fitting frame; 233, connecting rod one; 234, connecting rod two; 235, track rod two; 240, sliding frame; 241, incomplete tooth ring; 242, connecting frame; 250, drive module; 251, mounting; 252, drive gear; 253, transmission shaft; 254, guide roller; 255, transmission belt; 260, movable frame; 270, drive motor; 300, adjustment assembly; 310, frame-shaped frame; 320, moving seat; 321, internal thread seat; 330, lead screw; 331, transmission gear one; 340, transmission gear two; 350, shaft rod; 351, hand wheel; 400, welding gun; 410, welding head. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Please refer to Figures 1-5In the embodiment of the present application, a building steel structure workpiece butt welding device comprises a support frame 100, a centering assembly 200, an adjusting assembly 300 and a welding gun 400, one end of the support frame 100 is fixedly provided with a cantilever frame 110, the other end of the support frame 100 is provided with a U-shaped groove, the U-shaped groove is used for emptying the welding position of the anchor bar, the centering assembly 200 comprises a notched pipe 210, the notched pipe 210 is in a vertical state, the notched pipe 210 is fixedly installed at one end of the cantilever frame 110, the notch groove of the notched pipe 210 faces away from one side of the cantilever frame 110, the bottom end of the notched pipe 210 is fixedly provided with a movable frame 260, the inner wall of the movable frame 260 is rotatably connected with a sliding frame 240, the outer side wall of the sliding frame 240 is fixedly provided with a connecting frame 242, the inner wall of the notched pipe 210 is provided with an extrusion unit 230, the extrusion unit 230 is used for centrally limiting the anchor bar in the middle position of the notched pipe 210, the outer side wall of the movable frame 260 is fixedly provided with a driving module 250, the driving module 250 is used for driving the sliding frame 240 to rotate, the welding gun 400 is arranged outside the notched pipe 210, the welding gun 400 comprises a welding head 410 at the bottom end, the adjusting assembly 300 is fixedly installed at one end position of the connecting frame 242, the welding gun 400 is installed on the adjusting assembly 300, and the adjusting assembly 300 is used for adjusting the distance between the welding gun 400 and the notched pipe 210.

[0034] Specifically, the top view profiles of the movable frame 260 and the notched pipe 210 are both C-shaped, and the sector angle of the notch on the notched pipe 210 is less than 120 degrees, in use, the support frame 100 is placed on the base plate, the middle position of the notched pipe 210 is aligned with the installation position of the anchor bar, the anchor bar is placed into the notched pipe 210, the anchor bar is centrally limited by the extrusion unit 230, so that the anchor bar stands on the base plate, the distance between the welding head 410 and the weld is adjusted by the adjusting assembly 300, which is convenient for being suitable for anchor bars with different outer diameters, then the welding gun 400 is started, so that the welding head 410 welds the weld, the driving module 250 drives the sliding frame 240 to rotate a whole circle, the sliding frame 240 drives the welding gun 400 to forward revolve a circle through the adjusting assembly 300, so that the welding head 410 revolves to continuously weld the annular weld, after welding, the driving module 250 drives the welding gun 400 to rotate a circle in the reverse direction, so that the welding gun 400 is reset, at the same time, the pipelines on the welding gun 400 are prevented from being wound around the notched pipe 210, the support frame 100 is moved, so that the welded anchor bar is relatively moved out from the notch position of the notched pipe 210, which is convenient for moving the support frame 100 to the next anchor bar installation position, and the welding quality and efficiency of the anchor bar are improved.

[0035] Embodiment one

[0036] As Figures 3-6As shown, in this embodiment, the driving module 250 comprises a mounting piece 251 fixedly installed on the outer side wall of the movable frame 260, the inner bottom surface of the mounting piece 251 is rotationally connected with three transmission shafts 253, the transmission shafts 253 are annularly and equidistantly arranged, the bottom end of the transmission shaft 253 rotationally penetrates downward below the mounting piece 251, the bottom end of the transmission shaft 253 is fixedly sleeved with a driving gear 252, the top end of the transmission shaft 253 is fixedly sleeved with a synchronous wheel, and the middle synchronous wheel and the synchronous wheels on both sides are all transmissionally connected with a transmission belt 255, the outer side wall of the gap tube 210 is fixedly installed with a driving motor 270, the output end of the driving motor 270 is transmissionally connected with the transmission shaft 253 at the middle position, the driving gear 252 is transmissionally connected with the sliding frame 240, the outer side wall of the sliding frame 240 is fixedly sleeved with an incomplete tooth ring 241, the driving gear 252 is meshingly transmissionally connected with the incomplete tooth ring 241, and the inner bottom surface of the mounting piece 251 is transmissionally connected with a plurality of guide rollers 254, the guide rollers 254 are used for guiding the transmission belt 255.

[0037] In this embodiment, the driving motor 270 drives the transmission shaft 253 at the middle position to rotate, the synchronous rotation between the three transmission shafts 253 is realized through the arrangement of the two transmission belts 255, the transmission shaft 253 drives the driving gear 252 to rotate, the synchronous rotation between the three driving gears 252 is realized, the driving gear 252 rotates to drive the sliding frame 240 to rotate through the incomplete tooth ring 241, and the three annularly and equidistantly arranged driving gears 252 are arranged to realize that at least two driving gears 252 are simultaneously meshed with the incomplete tooth ring 241 when the sliding frame 240 rotates, so that the plurality of driving gears 252 drive the sliding frame 240 to rotate, which is convenient for driving the sliding frame 240 to rotate while reserving the gap on the sliding frame 240.

[0038] As Figures 3-8As shown, in the embodiment, the extrusion unit 230 comprises three annular equiangularly arranged rail rods two 235, which are fixedly connected between the inner wall of the notched pipe 210, rail rod two 235 slidingly inserts rail rod one 231, the top end of the three rail rod one 231 is fixedly connected with the pressing frame 220, one side of the rail rod two 235 is provided with the abutting frame 232, one side wall of the abutting frame 232 is rotatably connected with the connecting rod one 233 and the connecting rod two 234, one end of the connecting rod one 233 is rotatably connected with the inner wall of the notched pipe 210, one end of the connecting rod two 234 is rotatably connected with one side wall of the rail rod one 231, the other side wall of the abutting frame 232 is arc-shaped, and the outer diameter of the other side wall arc of the abutting frame 232 is the same as the inner diameter of the notched pipe 210, the height positions of the plurality of abutting frames 232 are staggered with each other, both sides of the pressing frame 220 are fixedly connected with the inserting rod 221, both sides of the outer side wall of the notched pipe 210 are fixedly connected with the support seat 211, the support seat 211 and the pressing frame 220 are fixedly connected with the tension spring 222, and the bottom end of the inserting rod 221 is slidingly inserted with the same side support seat 211.

[0039] In specific implementation, the pressing frame 220 is manually lifted upward, the pressing frame 220 drives the three rail rod one 231 to slide upward, at the same time, the pressing frame 220 pulls the tension spring 222 upward against the tension of the tension spring 222, the rail rod one 231 moves upward, thereby driving the connecting rod two 234 to move upward, so as to drive the connecting rod one 233 to deflect to the inner wall of the notched pipe 210, the abutting frame 232 deflects upward and outward, the plurality of abutting frames 232 at different angles are mutually divergent, after the anchor bar is inserted into the notched pipe 210, the pressing frame 220 is released, the pressing frame 220 moves downward under the action of the tension of the tension spring 222, so that the rail rod one 231 moves downward, the rail rod one 231 pushes the connecting rod two 234 downward, so that the plurality of abutting frames 232 fold to the middle, thereby pushing the anchor bar, the anchor bar is centrally positioned at the middle position of the notched pipe 210, and the anchor bar is vertically limited on the base plate through the arrangement of the plurality of staggered abutting frames 232, so as to conveniently position and pre-fix the anchor bar, after welding is completed, the pressing frame 220 is pulled upward, so that the abutting frame 232 is separated from the anchor bar, thereby facilitating subsequent removal of the device.

[0040] Embodiment two

[0041] On the basis of embodiment one, in order to conveniently adjust the position of the welding gun 400, thereby achieving the effect of welding anchor bars with different diameters.

[0042] As Figure 9As shown, in the embodiment, the adjusting assembly 300 comprises a frame 310, one end of the frame 310 is fixedly connected between the connecting frame 242, two ends of the frame 310 are rotatably connected with two side walls between the two lead screws 330, a moving seat 320 is arranged between the two lead screws 330, the welding gun 400 is fixedly installed between the moving seat 320, both sides of the moving seat 320 are fixedly connected with the internal thread seat 321, the internal thread seat 321 is screw-connected with the adjacent lead screw 330, the other end of the frame 310 is rotatably connected with the shaft 350, the transmission gear two 340 is fixedly sleeved on one end of the shaft 350, the transmission gear one 331 is fixedly sleeved on one end of the lead screw 330, the transmission gear one 331 and the transmission gear two 340 are in meshing transmission, the hand wheel 351 is fixedly sleeved on the other end of the shaft 350, the frame 310 is biased to one side relative to the sliding frame 240, so that the walking angle of the welding head 410 is between ten to fifteen degrees.

[0043] In specific implementation, the hand wheel 351 is manually rotated, the hand wheel 351 rotates the transmission gear two 340 through the shaft 350, the transmission gear two 340 drives the two lead screws 330 to rotate through the two transmission gear ones 331, the lead screw 330 rotates to drive the moving seat 320 to move along the lead screw 330 through the internal thread seat 321, so as to drive the welding gun 400 to move, the distance between the end of the welding head 410 and the axis in the gap pipe 210 is adjusted, the distance between the welding head 410 and the weld is controlled, so as to conveniently adjust the position of the welding gun 400 according to the diameter of the anchor bar, and the application range is increased.

[0044] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and not limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be considered as limiting the claims involved.

[0045] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A butt welding device for building steel structure workpieces, characterized in that, include: A support frame (100) has a cantilever frame (110) fixedly installed at one end, and a U-shaped groove is provided at the other end of the support frame (100). The U-shaped groove is used to vent the welding position of the anchor bar. The centering component (200) includes a notched tube (210) in a vertical state. The notched tube (210) is fixedly installed at one end of the cantilever frame (110). The notch of the notched tube (210) faces away from the cantilever frame (110). A movable frame (260) is fixedly installed at the bottom end of the notched tube (210). A sliding frame (240) is rotatably connected to the inner wall of the movable frame (260). A connecting frame (242) is fixedly installed on the outer wall of the sliding frame (240). A pressing unit (230) is installed on the inner wall of the notched tube (210). The pressing unit (230) is used to center and limit the anchor bar to the middle position of the notched tube (210). A driving module (250) is fixedly installed on the outer wall of the movable frame (260). The driving module (250) is used to drive the sliding frame (240) to rotate. A welding gun (400) is disposed on the outside of the notched tube (210), the welding gun (400) including a welding head (410) located at the bottom end; An adjustment assembly (300) is fixedly installed at one end of a connecting frame (242), and the welding gun (400) is mounted on the adjustment assembly (300). The adjustment assembly (300) is used to adjust the distance between the welding gun (400) and the notched tube (210).

2. The butt welding device for building steel structure workpieces according to claim 1, characterized in that, The drive module (250) includes a mounting component (251), which is fixedly mounted on the outer side wall of the movable frame (260). The inner bottom surface of the mounting component (251) is rotatably connected to three drive shafts (253). The drive shafts (253) are arranged in a ring at equal intervals. The bottom end of the drive shaft (253) rotates downward and passes under the mounting component (251). The bottom end of the drive shaft (253) is fixedly sleeved with a drive gear (252). The top end of the drive shaft (253) is fixedly sleeved with a synchronous pulley. The middle synchronous pulley and the synchronous pulleys on both sides are connected by a drive belt (255). The outer side wall of the notch tube (210) is fixedly mounted with a drive motor (270). The output end of the drive motor (270) is connected to one of the drive shafts (253) in the middle position. The drive gear (252) is connected to the sliding frame (240).

3. The butt welding device for building steel structure workpieces according to claim 2, characterized in that, An incomplete toothed ring (241) is fixedly sleeved on the outer wall of the sliding frame (240), and the drive gear (252) meshes with the incomplete toothed ring (241) for transmission.

4. The butt welding device for building steel structure workpieces according to claim 2, characterized in that, The inner bottom surface of the mounting component (251) is connected to a plurality of guide rollers (254), which are used to guide the transmission belt (255).

5. The butt welding device for building steel structure workpieces according to claim 1, characterized in that, The extrusion unit (230) includes three annular rails (235) arranged at equal angles. The rails (235) are fixedly connected to the inner wall of the notch tube (210). Rails (231) are slidably inserted into the rails (235). A pressing frame (220) is fixedly connected between the top ends of the three rails (231). A fitting frame (232) is provided on one side of the rails (235). A connecting rod (233) and a connecting rod (234) are rotatably connected to one side wall of the fitting frame (232). One end of the connecting rod (233) is rotatably connected to the inner wall of the notch tube (210), and one end of the connecting rod (234) is rotatably connected to one side wall of the rail (231).

6. The butt welding device for building steel structure workpieces according to claim 5, characterized in that, The other side wall of the bonding frame (232) is an arc surface, and the outer diameter of the arc surface of the other side wall of the bonding frame (232) is the same as the inner diameter of the notched tube (210). The height positions of the multiple bonding frames (232) are staggered.

7. The butt welding device for building steel structure workpieces according to claim 6, characterized in that, Both sides of the pressing frame (220) are fixedly connected with insert rods (221), both sides of the outer wall of the notch tube (210) are fixedly connected with support seats (211), a tension spring (222) is fixedly connected between the support seat (211) and the pressing frame (220), and the bottom end of the insert rod (221) is slidably inserted into the support seat (211) on the same side.

8. The butt welding device for building steel structure workpieces according to claim 1, characterized in that, The adjustment assembly (300) includes a frame (310), one end of which is fixedly connected to a connecting frame (242). Two lead screws (330) are rotatably connected between the two side walls of the frame (310). A movable seat (320) is provided between the two lead screws (330). The welding gun (400) is fixedly installed between the movable seat (320). Both sides of the movable seat (320) are fixedly connected to internal thread seats (321), and the internal thread seats (321) are screwed into the adjacent lead screws (330).

9. A butt welding device for building steel structure workpieces according to claim 8, characterized in that, The other end of the frame (310) is rotatably connected to a shaft (350). One end of the shaft (350) is fixedly sleeved with a second transmission gear (340). One end of the lead screw (330) is fixedly sleeved with a first transmission gear (331). The first transmission gear (331) and the second transmission gear (340) mesh and transmit power. The other end of the shaft (350) is fixedly sleeved with a handwheel (351).

10. A butt welding device for building steel structure workpieces according to claim 9, characterized in that, The frame (310) is offset to one side relative to the sliding frame (240), so that the travel angle of the welding head (410) is between ten and fifteen degrees.

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