Special welding device for steel structure

Abstract

The invention relates to the technical field of steel structure processing, in particular to a special welding device for a steel structure, which comprises welding equipment, a support frame for supporting and fixing the welding equipment, a lifting assembly arranged above the support frame and used for adjusting the height of the welding equipment, and a support assembly mounted at the top of the lifting assembly and used for adjusting the height of the welding equipment again; a walking assembly is rotationally installed at the bottom of the supporting assembly, and the walking assembly is supported on the I-shaped steel and can drive the welding equipment to move. A counterweight assembly with the same mass as the welding equipment, the supporting frame and the lifting assembly is arranged on the side, away from the welding equipment, of the supporting assembly. The lifting assembly is stably installed on the side edge of the steel structure through cooperation of the supporting assembly and the walking assembly, the state of the lifting assembly can be adjusted, the supporting frame and the welding equipment can be lifted through the length-adjustable function of the lifting assembly before the steel structure is welded, and then the welding equipment is stably placed on the side edge of the steel structure; and welding treatment of the steel structure is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure processing, in particular to a special welding device for steel structures. Background Art

[0002] During the fabrication and installation of steel structures, the coordinated operation of bolting and welding is a key process for achieving a secure connection between adjacent steel members. However, welding work on steel members high up in steel structures currently relies on aerial platforms to transport workers and welding equipment to elevated locations. During construction, workers must remain at the steel joints for extended periods, using welding equipment to complete the welding task. To improve construction efficiency, multiple aerial platforms are often required to accommodate the simultaneous operation of multiple workers.

[0003] However, this traditional method has significant drawbacks. If multiple devices are deployed simultaneously, costs increase exponentially. Furthermore, hidden expenses such as routine equipment maintenance, transportation costs, and operator salaries further exacerbate the capital turnover pressure on construction companies.

[0004] In terms of operating range, conventional articulated boom lifts typically have a maximum operating height of less than 40 meters. This equipment is insufficient for working on super-high-rise steel structures, which can reach heights of hundreds of meters. When encountering complex architectural shapes, such as sloping facades and cantilevered structures, the lifts struggle to reach the work surface due to site flatness and obstacles.

[0005] From a safety perspective, the limited size of the aerial work platform creates a very tight space for movement when welding equipment and operators are simultaneously deployed. In wind conditions exceeding force 4, equipment stability is significantly reduced. Furthermore, when relocating, operators must carry welding guns and cables weighing 20-30 kg, making movement more difficult and potentially compromising safety. Summary of the Invention

[0006] The purpose of the present invention is to provide a special welding device for steel structures, aiming to improve the problems of high cost of auxiliary aerial platforms used for steel welding and difficulty in manually transferring equipment for welding steel structures.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: A special welding device for steel structures includes welding equipment, a support frame for supporting and fixing the welding equipment, a lifting assembly arranged above the support frame for adjusting the height of the welding equipment, and a support assembly installed on the top of the lifting assembly for adjusting the height of the welding equipment again; a walking assembly is rotatably installed at the bottom of the support assembly, the walking assembly is supported on the I-beam and can drive the welding equipment to move; a counterweight assembly with a mass equal to that of the welding equipment, the support frame and the lifting assembly is provided on the side of the support assembly away from the welding equipment.

[0008] Further, the walking component includes a main board, two side boards respectively hinged and installed at both ends of the main board, four limiting boards respectively slidably installed at both ends of the two side boards, and four rollers installed under the main board; the rollers are arranged to roll on the I-beam, the limiting boards at the same end of the two side boards are located on the same side of the I-beam, and the limiting boards are in sliding contact with the I-beam.

[0009] Further, at both ends of the side wall of the side board, snap grooves with openings at the ends are arranged along its length direction, and a bidirectional threaded rod is arranged in parallel under the side board; the top of the limiting board is arranged in a U-shaped structure with an upward opening, and a snap board is fixedly arranged on the side wall of the U-shaped structure; the side board penetrates through the top of the limiting board, and the snap board is located in the snap groove, and at the same time the bidirectional threaded rod threadedly penetrates through the limiting board.

[0010] Further, nesting grooves are arranged at the bottoms of the side walls of the two limiting boards that are distributed on both sides of the I-beam and face each other, both ends of the nesting grooves are arranged to be open and are adapted to the edges of the I-beam, and the edges of the I-beam penetrate through the nesting grooves.

[0011] Further, a connecting shaft is arranged between the two rollers at the same end of the main board; clamping plates are detachably arranged at both ends under the main board, and the connecting shaft penetrates through the space formed by the main board and the clamping plates.

[0012] Further, the support component includes a chassis, a common connection plate, a lifting frame, a threaded column and multiple vertical rods; the common connection plate and the chassis are arranged vertically up and down, the threaded column and the multiple vertical rods are both arranged between the common connection plate and the chassis, and the threaded column is located in the middle, and at the same time the multiple vertical rods are arranged along the circumferential direction of the chassis; the lifting frame is located between the common connection plate and the chassis, and the threaded column threadedly penetrates through the lifting frame, and at the same time the vertical rods penetrate through the lifting frame.

[0013] Further, a worm gear is installed at the bottom of the threaded column, a worm is meshed on the side of the worm gear, and the worm is connected and installed on the chassis through a bearing; a connecting rod is fixedly arranged under the chassis, and the connecting rod is inserted into a connecting pipe in the middle of the main board through a bearing connection.

[0014] Further, the lifting component includes a fixed pulley and a movable pulley arranged vertically up and down and a winding device installed on the side of the fixed pulley; the fixed pulley and the movable pulley form a labor-saving pulley block, and the fixed pulley and the movable pulley are respectively connected to the lifting frame and the support frame, and at the same time a rope is wound around the labor-saving pulley block; the winding device includes a winding drum whose central shaft is installed on the side of the fixed pulley through a support plate, and end plates and rotating wheels respectively installed at both ends of the central shaft, multiple braking grooves are evenly arranged at the edges of the end plates, a braking column penetrates through a certain braking groove, and the end of the braking column is snap-fitted on a clamping column, and the clamping column is fixedly installed on the side wall of the support plate; the end of the rope is wound on the winding drum.

[0015] Furthermore, the support frame includes a base plate arranged below the welding equipment and two sets of vertical frames respectively installed on both sides of the base plate; universal wheels and walking wheels are respectively provided at both ends below the base plate; the screw installed on the base plate passes through the ear plate at the bottom of the vertical frame, and a guide rod is passed through the support tube fixedly installed on the vertical frame, a pressure plate is fixedly provided at one end of the guide rod, and a nut is threadedly sleeved at the other end, a spring in a compressed state is provided between the pressure plate and the support tube and on the guide rod, and the pressure plate is arranged in contact with the welding equipment.

[0016] Furthermore, the counterweight assembly includes a connecting frame and a warehouse body with an opening at the top. Vertical grooves are provided on the side walls of the warehouse body. The vertical section of the connecting frame is connected and installed in the groove by bolts, and the horizontal section of the connecting frame is connected to the lifting frame.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The lifting assembly provided in the present invention is stably installed on the side of the steel structure through the cooperation of the support assembly and the walking assembly, and the state of the lifting assembly itself can be adjusted. Therefore, before welding the steel structure, the support frame and the welding equipment can be lifted by utilizing the adjustable length function of the lifting assembly, and then the welding equipment can be stably placed on the side of the steel structure, thereby facilitating the workers to use the welding equipment to complete the welding process of the steel structure.

[0018] 2. The support assembly provided in the present invention includes a lifting frame, a threaded column with a thread passing through the lifting frame, and a vertical rod passing through the lifting frame. With the cooperation of the threaded column and the vertical rod, the lifting frame can be stably installed, and the height of the lifting frame can be adjusted by rotating the threaded column. The height of the support frame and the welding equipment can be adjusted over a short distance, that is, the welding equipment can be lifted and lowered again, providing support for placing the welding equipment and the support frame on the steel structure and for transferring components such as the support assembly and the walking assembly from one position to another. The device can then facilitate the welding of steel structures at different positions.

[0019] 3. The walking assembly provided in the present invention includes a main board, a roller installed under the main board and a limit plate installed at the end of the main board; because the roller is directly supported on the steel structure, the position of the main board can be adjusted by rotating the roller; during the movement of the main board, the bottom of the limit plate is sleeved on the edge of the steel structure, limiting the position of the main board and guiding it to move in a predetermined direction, and enhancing the stability of the connection between the main board and the steel structure.

[0020] 4. The support assembly and walking assembly provided in the present invention are movably connected. After the height of the welding equipment is adjusted again, the support assembly can be manually controlled to rotate, and the direction of the support assembly and the height of the welding equipment can be adjusted, thereby facilitating the placement of the support frame and the welding equipment on the steel structure and providing convenience for transferring the position of the walking assembly and the support assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the adaptation of the present invention to the steel structure; Figure 2 It is a structural diagram of the welding machine, gas cylinder, support frame, lifting assembly, and support assembly of the present invention; Figure 3 It is a structural schematic diagram of the support frame, lifting assembly, and support assembly of the present invention; Figure 4 It is a structural schematic diagram of the support frame of the present invention; Figure 5 It is a structural diagram of the vertical frame of the present invention; Figure 6 It is a structural schematic diagram of the lifting assembly of the present invention; Figure 7 It is a structural schematic diagram of the movable pulley and connecting rod of the present invention; Figure 8 It is a structural schematic diagram of the winding device and the fixed pulley of the present invention; Figure 9 It is a partial structural diagram of the winding device and the fixed pulley of the present invention; Figure 10 It is a schematic structural diagram of the walking assembly, support assembly, and counterweight assembly of the present invention; Figure 11 It is a partial schematic diagram of the walking assembly and the supporting assembly of the present invention; Figure 12 It is a structural schematic diagram of the walking assembly of the present invention; Figure 13 It is a structural schematic diagram of the mainboard of the present invention; Figure 14 It is a structural schematic diagram of the counterweight assembly of the present invention.

[0022] In the figure: 1. I-beam; 2. Welding machine; 3. Gas cylinder; 4. Support frame; 41. Bottom plate; 42. Universal wheel; 43. Travel wheel; 44. Vertical frame; 45. Ear plate; 46. Guide rod; 47. Spring; 48. Pressure plate; 49. Support tube; 5. Lifting assembly; 51. Rope; 52. Movable pulley; 53. Fixed pulley; 531. Support plate; 532. Clamping column; 533. Braking column; 54. Connecting rod; 541. Limiting nut; 542. Thrust bearing; 543. Top plate; 55. Winding device; 551. Rotating wheel; 552. End plate; 55 3. Brake groove; 554. Winding drum; 6. Support assembly; 61. Threaded column; 62. Vertical rod; 63. Common plate; 64. Lifting frame; 65. Worm gear; 66. Worm; 67. Chassis; 68. Connecting rod; 7. Travel assembly; 71. Main board; 711. Connecting pipe; 712. Clamping plate; 72. Roller; 721. Coupling shaft; 73. Side plate; 731. Snap groove; 732. Bidirectional threaded rod; 74. Limit plate; 741. Snap plate; 742. Sleeve groove; 8. Counterweight assembly; 81. Connecting frame; 82. Warehouse body; 83. Groove. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] In order to reduce or even avoid the use of aerial platforms to lift welding equipment to assist workers in completing the welding process of steel structures, and to reduce the safety risks caused by workers transferring welding equipment, this embodiment provides a device for steel structure welding.

[0025] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 10 As shown, the welding device includes welding equipment, a support frame 4, a lifting assembly 5, a support assembly 6, a walking assembly 7, a counterweight assembly 8, etc. The welding equipment is supported on the support frame 4, and the welding equipment is stably supported by the support frame 4. The lifting assembly 5 is arranged on the top of the support frame 4, and the height of the support frame 4 and the welding equipment can be adjusted by adjusting the state of the lifting assembly 5, so that the welding equipment can be lifted from the ground to the side of the intersection of adjacent steel structures by the lifting assembly 5, providing support for completing the welding process of the steel structure. The support assembly 6 is installed on the top of the lifting assembly 5, and the height of the lifting assembly 5 is adjusted by the support assembly 6, and then the height of the support frame 4 and the welding equipment is adjusted again, so as to place the welding equipment on the steel structure and adjust the position of the support assembly 6, the walking assembly 7, and the counterweight assembly 8, so as to provide support for welding at different positions of the steel structure.

[0026] The welding equipment can be configured as a carbon dioxide gas shielded welding equipment, a manual arc welding equipment, etc. If configured as a carbon dioxide gas shielded welding equipment, it at least comprises a welding machine 2 and a gas cylinder 3, and the relative positions of the welding machine 2 and the gas cylinder 3 are restricted by a chain.

[0027] like Figure 4 As shown, in order to stably support the welding equipment, the support frame 4 includes a bottom plate 41 , two sets of vertical frames 44 and a top frame installed on the top of the two sets of vertical frames 44 .

[0028] like Figure 4 As shown, the base plate 41 is arranged below the welding equipment, that is, the welding machine 2 and the gas cylinder 3 are supported on the base plate 41. Universal wheels 42 and walking wheels 43 are respectively provided at both ends below the base plate 41 to realize the movable setting of the support frame 4 and provide support for adjusting the position of the welding equipment according to needs.

[0029] like Figure 4 、 Figure 5 As shown, a plurality of screws are fixedly provided on the outer side wall of the base plate 41, and the screws are provided through the ear plates 45 at the bottom of the vertical frame 44. Nuts are threadedly sleeved on the ends of the screws, and the vertical frame 44 and the base plate 41 can be stably connected under the cooperation of the nuts and the screws.

[0030] like Figure 5 As shown, when the vertical frame 44 is stably installed, in order to further limit the position of the welding equipment relative to the base plate 41, a support tube 49 is fixedly installed on the vertical frame 44, and a guide rod 46 is provided at each end of the support tube 49. A pressure plate 48 is fixedly provided at one end of the guide rod 46, and a nut is threadedly provided at the other end. At the same time, a spring 47 is provided between the pressure plate 48 and the support tube 49. The spring 47 is in a compressed state and is sleeved on the guide rod 46. Therefore, under the action of the spring 47, the pressure plate 48 can be controlled to fit the welding equipment. An anti-slip layer is provided on the contact surface between the pressure plate 48 and the welding equipment to increase the difficulty of moving the welding equipment relative to the base plate 41.

[0031] like Figure 6 As shown, in order to lift the support frame 4 and the welding equipment from the ground to a high place, the lifting assembly 5 includes a fixed pulley 53, a movable pulley 52, a winding device 55, etc. The fixed pulley 53 and the movable pulley 52 form a labor-saving pulley group, and the fixed pulley 53 and the movable pulley 52 are respectively connected to the support assembly 6 and the support frame 4. At the same time, a rope 51 is wound around the labor-saving pulley group. After the support assembly 6 is installed on the steel structure, the position of the movable pulley 52 relative to the fixed pulley 53 can be adjusted by loosening the rope 51, thereby adjusting the height of the support frame 4 and the welding equipment to achieve lifting of the welding equipment.

[0032] like Figure 8As shown, the winding device 55 includes a winding drum 554, an end plate 552 and a rotating wheel 551. The central axis of the winding drum 554 is installed on the support plate 531 through a bearing connection. The support plate 531 is fixedly installed on the frame of the fixed pulley 53, so that the winding drum 554 is stably installed. In addition, the end of the rope 51 is wound on the winding drum 554, which can facilitate the rotation of the winding drum 554 to adjust the length of the rope 51 extending out of the pulley group, thereby providing support for adjusting the height of the welding equipment.

[0033] like Figure 8 、 Figure 9 As shown, the end plate 552 and the rotating wheel 551 are respectively mounted on the ends of the central shaft protruding from the bearing seat. Multiple brake grooves 553 are evenly distributed on the edge of the end plate 552. A brake post 533 is provided through each brake groove 553. The brake post 533 is adjustably mounted on the support plate 531. Before adjusting the height of the welding equipment, the constraints between the end plate 552 and the central shaft can be released, allowing the operator to control the rotation of the reel 554 by holding the rotating wheel 551 to achieve the retraction and release of the rope 51.

[0034] like Figure 9 As shown, to ensure a stable and adjustable mounting of the brake post 533 on the support plate 531, the brake post 533 is configured as a convex structure. A slot and a post 532 are respectively provided on the adjacent sidewalls of the brake post 533 and the support plate 531. The central angle of the slot is greater than 180°, and the post 532 extends through the slot. To ensure stable placement of the brake post 533 after adjustment, an anti-slip layer may be provided on the contact surface between the post 532 and the slot, or on the contact surface between the brake post 533 and the support plate 531, to increase resistance to movement of the brake post 533.

[0035] like Figure 4 、 Figure 7 As shown, a top plate 543 is provided at the bottom of the movable pulley 52 frame connected by bolts, and a connecting rod 54 is fixedly provided below the top plate 543. The bottom of the connecting rod 54 penetrates the top frame, and two limiting nuts 541 are threadedly sleeved on the upper and lower parts of the bottom of the connecting rod 54. The two limiting nuts 541 are distributed on the upper and lower sides of the top frame, and a thrust bearing 542 is provided on the side where the two limiting nuts 541 are close to each other. The thrust bearing 542 contacts the top frame, thereby achieving a stable connection between the connecting rod 54 and the support frame 4 under the action of the limiting nuts 541, and providing support for the support frame 4 to rotate relative to the lifting assembly 5 to adjust the orientation of the welding equipment.

[0036] like Figure 10As shown, in order to adjust the height of the welding equipment again through the support assembly 6, the support frame 4 and the welding equipment are placed on the steel structure. The support assembly 6 includes a chassis 67, a common plate 63, a lifting frame 64, a threaded column 61 and a plurality of vertical rods 62. The common plate 63 and the chassis 67 are distributed up and down, and the threaded column 61 and the plurality of vertical rods 62 are all arranged between the common plate 63 and the chassis 67, and the threaded column 61 is located in the middle. At the same time, the plurality of vertical rods 62 are distributed along the circumference of the chassis 67; a worm gear 65 is installed at the bottom of the threaded column 61, and a worm 66 is meshed with the side of the worm gear 65. The worm 66 is installed on the chassis 67 through a bearing connection. The staff can drive the worm 66 to rotate to drive the threaded column 61 to rotate. Lifting frame 64 is located between connecting plate 63 and chassis 67. Threaded post 61 is threaded through lifting frame 64, while vertical rod 62 extends through lifting frame 64. Lifting frame 64 is mounted on top of fixed pulley 53. Therefore, rotation of threaded post 61 forces lifting frame 64 to rise or fall, thereby adjusting the height of the welding equipment. The threaded post 61 and vertical rod 62 cooperate to constrain lifting frame 64 to a stable and flexible configuration.

[0037] like Figure 11 As shown, in order to place the support frame 4 on the steel structure after its bottom is higher than the upper side of the steel structure, a connecting rod 68 is fixedly provided under the chassis 67. The connecting rod 68 is inserted into the walking assembly 7 through a bearing connection, so that the support assembly 6 and the walking assembly 7 are movably connected, which makes it convenient for the staff to manually control the support assembly 6 to rotate around the central axis to adjust the position of the welding equipment.

[0038] like Figure 14 As shown, in order to install the counterweight assembly 8 on the side of the support assembly 6 away from the lifting assembly 5, the support frame 4, and the welding equipment, the lifting frame 64 is set as an I-shaped structure, the lifting assembly 5 is installed at one end of the lifting frame 64, and the counterweight assembly 8 is installed at the other end of the lifting frame 64.

[0039] like Figure 14 Specifically, the counterweight assembly 8 comprises a connecting frame 81 and an open-topped chamber 82. Vertical grooves 83 are provided on the sidewalls of chamber 82, which store heavy objects. The mass of the counterweight assembly 8 and the heavy objects is equal to the mass of the welding equipment, support frame 4, and lifting assembly 5. The vertical section of the connecting frame 81 is bolted and mounted in the groove 83, while the horizontal section of the connecting frame 81 is connected to the lifting frame 64.

[0040] like Figure 12As shown in the figure, in order to stably support the support component 6, the walking component 7 includes a main board 71, two side boards 73 respectively hinged at both ends of the main board 71, four limiting boards 74 respectively slidably installed at both ends of the two side boards 73, and four rollers 72 installed below the main board 71. The rollers 72 are rollingly arranged on the I-beam 1, which is convenient for pushing the walking component 7 and the support component 6 to move on the steel structure, realizing the transfer of the welding equipment. The limiting boards 74 at the same end of the two side boards 73 are located on the same side of the I-beam 1, and the limiting boards 74 are in sliding contact with the I-beam 1, and the position of the main board 71 can be restricted under the cooperation of the four limiting boards 74, guiding it to move along the length direction of the steel structure.

[0041] As Figure 13 shown in the figure, a coupling shaft 721 is arranged between the two rollers 72 at the same end of the main board 71. Clamping plates 712 are detachably arranged at both ends below the main board 71. The coupling shaft 721 penetrates through the space formed by the main board 71 and the clamping plates 712, realizing the detachable connection between the rollers 72 and the main board 71.

[0042] As Figure 12 shown in the figure, in order to be able to adjust the position of the limiting board 74 according to requirements, the limiting board 74 is adjustably installed on the side board 73, which is convenient for adjusting the position of the limiting board 74 relative to the steel structure according to requirements, providing support for transferring the device.

[0043] As Figure 12 shown in the figure, specifically, at both ends of the side wall of the side board 73, buckling grooves 731 with openings at the ends are arranged along its length direction, and a bidirectional threaded rod 732 is arranged in parallel below the side board 73. The top of the limiting board 74 is set as a U-shaped structure with an upward opening, and a buckling plate 741 is fixedly arranged on the side wall of the U-shaped structure. During assembly, the side board 73 penetrates through the top of the limiting board 74, and the buckling plate 741 is located in the buckling groove 731. At the same time, the bidirectional threaded rod 732 threadedly penetrates through the limiting board 74. In the case where the limiting board 74 and the side board 73 are stably and movably connected, the movement of the limiting board 74 can be controlled by rotating the bidirectional threaded rod 732.

[0044] As Figure 12 shown in the figure, in addition, at the bottom of the mutually approaching side walls of the two limiting boards 74 distributed on both sides of the I-beam 1 and facing each other, a sleeve groove 742 is arranged. Both ends of the sleeve groove 742 are set as openings and are adapted to the edge of the I-beam 1, and the size of the sleeve groove 742 is slightly larger than the edge size of the I-beam 1 (i.e., the steel structure in the above text). Therefore, when the limiting board 74 moves, the edge of the I-beam 1 can penetrate through the sleeve groove 742, or the I-beam 1 can be separated from the sleeve groove 742. When the limiting board 74 is sleeved on the I-beam 1, the stability of the connection between the walking component 7 and the steel structure can be enhanced. When the limiting board 74 is separated from the I-beam 1, it is convenient to transfer the position of the device, providing support for welding at different positions.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. For ordinary technicians in this field, various changes, modifications or additions without departing from the concept of the present invention should all fall within the scope of protection of the present invention.

Claims

1. A special welding device for steel structure, characterized by: It includes a welding device, a support frame (4) for supporting and fixing the welding device, a lifting component (5) arranged above the support frame (4) for adjusting the height of the welding device, and a support component (6) installed at the top of the lifting component (5) for further adjusting the height of the welding device; a walking component (7) is rotatably installed at the bottom of the support component (6), and the walking component (7) is supported on the I-beam (1) and can drive the welding device to move; a counterweight component (8) with a mass equal to that of the welding device, the support frame (4) and the lifting component (5) is arranged on one side of the support component (6) away from the welding device.

2. A special welding device for steel structure according to claim 1, characterized in that: The walking component (7) includes a main board (71), two side boards (73) respectively hinged at both ends of the main board (71), four limiting boards (74) respectively slidably installed at both ends of the two side boards (73), and four rollers (72) installed below the main board (71); the rollers (72) are arranged to roll on the I-beam (1), the limiting boards (74) at the same end of the two side boards (73) are located on the same side of the I-beam (1), and the limiting boards (74) are in sliding contact with the I-beam (1).

3. A special welding device for steel structure according to claim 2, characterized in that: At both ends of the side wall of the side board (73), snap grooves (731) with openings at the ends are arranged along its length direction, and a bidirectional threaded rod (732) is arranged in parallel below the side board (73); the top of the limiting board (74) is arranged in a U-shaped structure with an upward opening, and a snap board (741) is fixedly arranged on the side wall of the U-shaped structure; the side board (73) penetrates through the top of the limiting board (74), and the snap board (741) is located in the snap groove (731), and at the same time the bidirectional threaded rod (732) is threadedly penetrated through the limiting board (74).

4. A special welding device for steel structure according to claim 3, characterized in that: At the bottom of the side walls of the two limiting boards (74) distributed on both sides of the I-beam (1) and facing each other, nesting grooves (742) are arranged, both ends of the nesting grooves (742) are arranged as openings and are adapted to the edges of the I-beam (1), and the edges of the I-beam (1) penetrate through the nesting grooves (742).

5. A special welding device for steel structure according to claim 2, characterized in that: A connecting shaft (721) is arranged between the two rollers (72) at the same end of the main board (71); clamping plates (712) are detachably arranged at both ends below the main board (71), and the connecting shaft (721) penetrates through the space formed by the main board (71) and the clamping plates (712).

6. A special welding device for steel structure according to claim 2, characterized in that: The support component (6) includes a chassis (67), a common connection plate (63), a lifting frame (64), a threaded column (61) and multiple vertical rods (62); the common connection plate (63) and the chassis (67) are arranged vertically, the threaded column (61) and the multiple vertical rods (62) are both arranged between the common connection plate (63) and the chassis (67), and the threaded column (61) is located in the middle, and at the same time the multiple vertical rods (62) are arranged along the circumferential direction of the chassis (67); the lifting frame (64) is located between the common connection plate (63) and the chassis (67), and the threaded column (61) is threadedly penetrated through the lifting frame (64), and at the same time the vertical rods (62) penetrate through the lifting frame (64).

7. A special welding device for steel structure according to claim 6, characterized in that: A worm wheel (65) is installed at the bottom of the threaded column (61), and a worm (66) is meshed with the side of the worm wheel (65). The worm (66) is installed on the chassis (67) through a bearing connection; a connecting rod (68) is fixedly installed below the chassis (67), and the connecting rod (68) is inserted into the connecting pipe (711) in the middle of the main board (71) through a bearing connection.

8. The special welding device for steel structure according to claim 6, characterized in that: The lifting assembly (5) includes a fixed pulley (53) and a movable pulley (52) distributed up and down, and a winding device (55) installed on the side of the fixed pulley (53); the fixed pulley (53) and the movable pulley (52) form a labor-saving pulley group, and the fixed pulley (53) and the movable pulley (52) are respectively connected to the lifting frame (64) and the support frame (4), and a rope (51) is wound around the labor-saving pulley group; the winding device (55) includes a central axis installed on the side of the fixed pulley (53) through a support plate (531). The invention relates to a winding drum (554) with an end plate (552) and a rotating wheel (551) respectively installed at two ends of the central axis, wherein the edge of the end plate (552) is evenly provided with a plurality of brake grooves (553), and a brake column (533) is provided through a certain brake groove (553), and the end of the brake column (533) is buckled and sleeved on the clamping column (532), and the clamping column (532) is fixedly installed on the side wall of the support plate (531); the end of the rope (51) is wound on the winding drum (554).

9. The special welding device for steel structure according to claim 1, characterized in that: The support frame (4) comprises a base plate (41) arranged below the welding equipment and two sets of vertical frames (44) respectively installed on both sides of the base plate (41); universal wheels (42) and walking wheels (43) are respectively arranged at both ends below the base plate (41); a screw installed on the base plate (41) passes through the ear plate (45) at the bottom of the vertical frame (44); a guide rod (46) is passed through the support tube (49) fixedly installed on the vertical frame (44); a pressure plate (48) is fixedly provided at one end of the guide rod (46), and a nut is threadedly sleeved at the other end; a spring (47) in a compressed state is sleeved between the pressure plate (48) and the support tube (49) and on the guide rod (46); the pressure plate (48) is arranged in contact with the welding equipment.

10. The special welding device for steel structure according to claim 6, characterized in that: The counterweight assembly (8) includes a connecting frame (81) and a silo (82) with an opening at the top. Vertical grooves (83) are provided on the side walls of the silo (82). The vertical section of the connecting frame (81) is connected and installed in the groove (83) by bolts, and the horizontal section of the connecting frame (81) is connected to the lifting frame (64).

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