Welding device for steel supporting structure

Abstract

The invention discloses a welding device for a steel supporting structure, and relates to the technical field of welding, the welding device comprises a telescopic base plate and a first circular base plate fixedly connected to the top end of the telescopic base plate, and the front side face of the first circular base plate is movably connected with a first adjusting part and fixedly connected with a second adjusting part; movable steel fixing parts are arranged outside the first adjusting part and the second adjusting part, a lug plate is further fixedly connected to the side surface of the first circular base plate, and a welding part is arranged on the lug plate. According to the welding device, the two steel components are installed on the steel fixing parts of the first adjusting part and the second adjusting part correspondingly, the included angle of the two steel components can be changed by changing the angles of the first adjusting part and the second adjusting part, and the angles and the directions of the two steel components are further adjusted by adjusting the deflection angles of the steel fixing parts; and positioning in multiple directions can be conveniently achieved when the two steel components are welded, and the welding flexibility and welding quality of different kinds of steel are improved.

Description

Technical Field

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

[0002] Steel support structure is the most widely used building infrastructure at present. As the main load-bearing component of the building, the welding of the entire steel structure frame should be carried out from the middle of the entire steel structure. After the overall frame is formed, the welding should be extended to the surrounding areas. The on-site steel structure welding should first weld and fix the main beam, and then weld the secondary beam to the main beam. The main beam plays an important supporting role as the main supporting component. The height of the main beam is welded and superimposed according to the requirements of the building, and the secondary beam is welded to the main beam at the required angle.

[0003] At present, there are welding equipment for steel structure processing on the market, but it has the following two main problems: 1) Existing welding equipment used for steel structure processing cannot achieve the problem of multi-directional positioning when welding two steel beams of different specifications, and has certain limitations.

[0004] 2) During the welding process, an appropriate gap needs to be reserved between the two steel materials to ensure welding quality and avoid burning. However, the existing welding equipment used for steel structure processing cannot fix the two steel materials while ensuring sufficient gap between the two steel materials, which can easily lead to the weld being too large or too small, thus affecting the welding quality. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems that existing welding equipment cannot achieve multi-directional positioning when welding two steel beams of different specifications, and cannot fix the two steels while ensuring sufficient gap between the two steels, and to provide a welding device for steel support structures with a completely new structural design.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A welding device for a steel support structure includes a telescopic base and a first circular base fixedly connected to the top end thereof, wherein the front side surface of the first circular base is respectively movably connected to a first adjustment portion and fixedly connected to a second adjustment portion, and the outside of the first adjustment portion and the second adjustment portion are both provided with a movable steel fixing portion, and the side surface of the first circular base is also fixedly connected to an ear plate, and a welding portion is provided on the ear plate.

[0007] The steel fixing part includes a concave fixing frame, a concave surface of the concave fixing frame is provided with a sliding groove, a gear ring plate is slidably connected in the sliding groove, two groups of fixing blocks are fixedly connected to the gear ring plate, the outside of each group of fixing blocks is fixedly connected to a rectangular groove plate, a bidirectional threaded rod is provided in the sliding groove of each rectangular groove plate, and the outer surface of each bidirectional threaded rod is provided with two symmetrical clamping plates, which are located between the two clamping plates to clamp the steel component.

[0008] Furthermore, one end of the first adjusting portion is fixedly connected to a second circular substrate, the second circular substrate is coaxially rotatably connected to the first circular substrate, and a gap is provided between the second circular substrate and the second adjusting portion.

[0009] Furthermore, a first motor is installed on the rear side of the first circular substrate, and an output shaft of the first motor movably passes through the first circular substrate and is fixedly connected to the rear surface of the second circular substrate.

[0010] Furthermore, the first adjustment part and the second adjustment part have the same structure. The second adjustment part includes a rectangular fixing seat with a hollow interior. The cavity of the fixing seat is provided with a worm, and one end of the outer surface of the fixing seat is fixedly connected to the motor box, and the fixing seat is communicated with the interior of the motor box.

[0011] Furthermore, a forward and reverse motor is installed inside the motor box, and an output end of the forward and reverse motor is fixedly connected to a worm gear through a coupling, and the worm gear is engaged with the worm.

[0012] Furthermore, a rectangular groove is provided on the outer surface of the fixing seat, and an internal thread block is fixedly connected to the outer surface of the concave fixing frame. The internal thread block is threaded through the worm, and the internal thread block movably passes through the rectangular groove.

[0013] Furthermore, a second motor is installed on the side surface of the concave fixing frame, and the output shaft of the second motor movably passes through the concave fixing frame and is fixedly connected to a gear, which is engaged with the rack portion of the gear ring plate.

[0014] Furthermore, two symmetrical installation notches are provided inside the gear ring plate, and two sets of fixing blocks are fixedly installed in the two installation notches respectively.

[0015] Furthermore, both ends of the bidirectional threaded rod extend to the outside of both ends of the rectangular slot plate, and both ends of the bidirectional threaded rod are respectively equipped with a hand ring located outside the rectangular slot plate.

[0016] Furthermore, the welding part includes a first connecting plate fixedly connected to the rear side of the ear plate, one end of the first connecting plate is movably connected to the second connecting plate, one end of the second connecting plate is rotatably connected to the connecting pipe, and one end of the connecting pipe is fixedly provided with an automatic welding head for welding steel.

[0017] The present invention provides a welding device for a steel support structure, which installs two steel components on the steel fixing parts of a first adjusting part and a second adjusting part respectively, sets the second adjusting part and the telescopic base plate as a fixed structure, and sets the first adjusting part and the telescopic base plate as an adjustable structure. Changing the angle of the first adjusting part and the second adjusting part can change the angle between the two steel components, and then the second motor drives the gear to rotate clockwise or counterclockwise, and the gear drives the gear ring plate meshed with it to rotate clockwise or counterclockwise. When the gear ring plate rotates, it can drive the fixed block, the rectangular groove plate, the clamping plate and the steel component to deflect, further adjusting the angle and direction of the steel component, facilitating positioning of the two steel components in multiple directions when welding, and improving the flexibility and welding quality of welding between different steels.

[0018] The present invention provides a welding device for a steel support structure. By setting the first adjusting part and the second adjusting part to have the same structure, the steel fixing parts respectively located on the first adjusting part and the second adjusting part move in the same manner. When moving the steel fixing part, the forward and reverse motor is driven to drive the worm gear to rotate clockwise and counterclockwise, and the worm gear drives the worm to rotate clockwise and counterclockwise, so as to adjust the position of the internal thread block and the concave fixing frame on the fixing seat, so as to achieve the effect of adjusting the distance between the two steel components to be welded, ensure that an appropriate gap is left between the two welded steels, and thus ensure the welding quality.

[0019] The present invention provides a welding device for a steel support structure, which fixes two groups of fixing blocks and rectangular groove plates in two symmetrical installation notches, so that the fixing blocks, rectangular groove plates and gear ring plates are fixedly connected as one. The provision of two groups of fixing blocks, rectangular groove plates and clamping plates can increase the clamping area of the steel components and improve the stability of the steel components during welding.

[0020] The welding device of the present invention has a scientific design, a reasonable structure, simple operation and is easy to use. It achieves the purpose of positioning two steel components in multiple directions when welding, thereby greatly improving the flexibility and welding quality of welding between different steels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly and completely illustrate the technical solutions of the present invention, the following briefly describes the drawings used in the present invention. Obviously, the schematic drawings of the present invention are only used to explain the present invention and do not constitute an undue limitation of the present invention. Without inventive effort, those skilled in the art can also derive other drawings based on these drawings.

[0022] Figure 1 It is a three-dimensional diagram of the external overall structure of the welding device of the present invention.

[0023] Figure 2 Schematic diagram of the second adjusting part and its external structure in the welding device of the present invention.

[0024] Figure 3 for Figure 2 Enlarged view of part A.

[0025] Figure 4 It is a schematic diagram of the disassembled structure of the steel fixing part in the welding device of the present invention.

[0026] Figure 5 It is a side view of the welding device of the present invention.

[0027] Figure 6 This is a connection diagram of the first adjustment part and the second adjustment part on the telescopic base plate in the welding device of the present invention.

[0028] Figure 7 It is a front view of the welding device of the present invention.

[0029] Figure 8 Schematic diagram of the disassembly of the second adjustment part and the steel fixing part in the welding device of the present invention.

[0030] Figure 9 This is a disassembled view of the steel fixing portion and steel components in the welding device of the present invention.

[0031] Figure 10 It is a structural schematic diagram of the welding part in the welding device of the present invention.

[0032] In the figure: 1. telescopic base plate; 11. first circular base plate; 111. ear plate; 12. first motor; 2. first adjusting part; 21. second circular base plate; 3. second adjusting part; 31. fixing seat; 32. worm; 33. motor box; 4. steel fixing part; 41. concave fixing frame; 411. slide groove; 412. second motor; 413. gear; 414. internal thread block; 42. gear ring plate; 421. mounting notch; 43. fixing block; 44. rectangular groove plate; 441. two-way threaded rod; 442. wrist ring; 45. splint; 5. welding part; 51. first connecting plate; 52. second connecting plate; 53. connecting pipe; 54. automatic welding head; 6. steel component. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of this embodiment, it should be understood that the terms "front", "rear", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] like Figures 1 to 10 As shown, this embodiment provides a welding device for a steel support structure, including a telescopic base plate 1 and a first circular base plate 11 fixedly connected to the top thereof. The telescopic base plate 1 can be adjusted in length to adapt to the actual position of the steel material. The bottom end of the telescopic base plate 1 is provided with a bottom plate perpendicular to the ground or building plane. The telescopic performance of the telescopic base plate 1 is consistent with the working principle of the telescopic plate in the prior art, which is a common technical means. The telescopic base plate 1 is vertically arranged on the ground or building plane and can be calibrated by a level. The front side of the first circular base plate 11 is respectively movably connected to the first adjusting portion 2 and fixedly connected to the second adjusting portion 3. One end of the first adjusting portion 2 is fixedly connected to the second circular base plate 3. shaped substrate 21, the second circular substrate 21 is concentrically connected to the first circular substrate 11 for rotation, a gap is provided between the second circular substrate 21 and the second adjusting part 3, a first motor 12 is installed on the rear side of the first circular substrate 11, the output shaft of the first motor 12 movably passes through the first circular substrate 11 and is fixedly connected to the rear surface of the second circular substrate 21, and the second circular substrate 21 and the first adjusting part 2 are driven by the first motor 12 to rotate at a certain angle. Since the second adjusting part 3 is fixed on the first circular substrate 11, the position of the second adjusting part 3 is fixed, so as to adjust the angle between the first adjusting part 2 and the second adjusting part 3, and then adjust the angle between the two steel members 6.

[0036] Further, such as Figure 1 、 Figure 4 and Figure 6 As shown, the outside of the first adjustment part 2 and the second adjustment part 3 are both provided with a movable steel fixing part 4, and the steel fixing part 4 includes a concave fixing frame 41, and the concave surface of the concave fixing frame 41 is provided with a slide groove 411, and a gear ring plate 42 is slidably connected in the slide groove 411, and two groups of fixing blocks 43 are fixedly connected to the gear ring plate 42, and each group of fixing blocks 43 is fixedly connected to the outside of a rectangular slot plate 44, and a bidirectional threaded rod 441 is provided in the slide groove of each rectangular slot plate 44, and the outer surface of each bidirectional threaded rod 441 is threadedly connected to two symmetrical clamping plates 45, and a steel member 6 is clamped between the two clamping plates 45. The interior of the concave fixing frame 41 is a hollow structure to reduce the weight of the entire device. The steel fixing part 4 moves on the second adjustment part 3 to adjust the distance between the two steel members 6, as shown in FIG. Figure 3As shown, two symmetrical clamps 45 are placed on threads in different directions on the bidirectional threaded rod 441, so when the bidirectional threaded rod 441 is rotated, the two clamps 45 can be driven to move closer to each other or away from each other. When the two clamps 45 are relatively close to each other, the steel component 6 is clamped and fixed, and when they move away from each other, the steel component 6 is released. The provision of two groups of fixing blocks 43, rectangular slot plates 44 and clamps 45 can increase the clamping area of the steel component 6 and improve the stability of the steel component 6 during welding.

[0037] Among them, Figure 4 and Figure 8 As shown, the outer surface of the fixing seat 31 is also provided with a rectangular groove, and the outer surface of the concave fixing frame 41 is also fixedly connected to an internal thread block 414, the internal thread block 414 is threaded through the worm 32, and the internal thread block 414 is movable through the rectangular groove, and a second motor 412 is also installed on the side surface of the concave fixing frame 41, and the output shaft of the second motor 412 is movable through the concave fixing frame 41 and is fixedly connected to a gear 413, the gear 413 is engaged with the rack portion of the gear ring plate 42, and the interior of the gear ring plate 42 is provided with two symmetrical mounting notches 421, and the two sets of fixing blocks 43 are respectively fixedly installed in the two mounting notches 421, so that the fixing The fixed block 43 and the rectangular groove plate 44 are fixedly connected to the gear ring plate 42 as a whole. The fixed block 43 and the rectangular groove plate 44 are completely located on the outside of the concave fixing frame 41 and the gear ring plate 42. The two clamping plates 45 are slidably connected in the sliding groove of the rectangular groove plate 44. The second motor 412 drives the gear 413 to rotate clockwise and counterclockwise. The gear 413 drives the gear ring plate 42 engaged with it to rotate clockwise and counterclockwise. When the gear ring plate 42 rotates, it can drive the fixed block 43, the rectangular groove plate 44, the clamping plate 45 and the steel component 6 to deflect, thereby adjusting the angle and direction of the two steel components 6, so as to facilitate the two steel components 6 to be positioned in multiple directions when welding.

[0038] Among them, Figure 8 and Figure 9 As shown, the two ends of the bidirectional threaded rod 441 extend to the outside of the two ends of the rectangular slot plate 44 respectively, and the two ends of the bidirectional threaded rod 441 are respectively installed with a hand ring 442 located outside the rectangular slot plate 44. By holding the hand ring 442 at any end of the bidirectional threaded rod 441 and rotating it, the bidirectional threaded rod 441 can be driven to rotate, and the bidirectional threaded rod 441 drives its two symmetrical splints 45 on the outside to move, thereby achieving the effect of manually adjusting the splint 45 to clamp and release the steel component 6.

[0039] Further, such as Figure 2 and Figure 8As shown, the structures of the first adjusting part 2 and the second adjusting part 3 are the same. In this embodiment, the second adjusting part 3 is taken as an example to introduce its structural structure. The second adjusting part 3 includes an internal hollow rectangular fixing seat 31, and the cavity of the fixing seat 31 is provided with a worm 32, and one end of the outer surface of the fixing seat 31 is fixedly connected to the motor box 33. The fixing seat 31 is communicated with the interior of the motor box 33, and a forward and reverse motor is installed inside the motor box 33. The output end of the forward and reverse motor is fixedly connected to a worm gear through a coupling, and the worm gear is engaged with the worm 32. By driving the forward and reverse motor to drive the worm gear to rotate forward and reverse, the worm gear drives the worm to rotate forward and reverse, so as to adjust the position of the internal thread block 414 and the concave fixing frame 41 on the fixing seat 31, so as to achieve the effect of adjusting the distance between the two steel components 6 to be welded, ensuring that there is an appropriate gap between the two welded steels, and thus ensuring the welding quality.

[0040] Further, such as Figure 1 and Figure 10 As shown, the side surface of the first circular substrate 11 is also fixedly connected to an ear plate 111, and a welding part 5 is provided on the ear plate 111. The welding part 5 includes a first connecting plate 51 fixedly connected to the rear side of the ear plate 111, and one end of the first connecting plate 51 is movably connected to the second connecting plate 52, and one end of the second connecting plate 52 is rotatably connected to a connecting pipe 53, and one end of the connecting pipe 53 is fixedly provided with an automatic welding head 54 for welding steel. The entire welding part 5 can be moved at multiple angles, and the connecting pipe 53 has a sufficient length required for welding, ensuring that the automatic welding head 54 has sufficient space for welding the two steel components 6. When welding, when the ambient temperature is lower than 5°C, the relative air humidity is ≥80%, and the groove weld has no bottom weld, the weld needs to be preheated and the preheating range is 50mm to 80mm from both ends of the weld. When the constraint force is large, the weld needs to be positioned.

[0041] When the plate thickness is 25-40mm, the preheating temperature is generally 80-100℃, the interlayer temperature is generally 80-200℃, the tack weld length is 80-100mm, the spacing is 400-500mm, and the tack weld should be more than 30mm away from the weld end. If cracking or other serious defects occur in the tack weld, the cause must be found out first, and then the original tack weld should be removed with a carbon arc gouging, and then the assembler should reposition it.

[0042] It is strictly forbidden to strike an arc on the base material other than the weld.

[0043] The corners of the fillet weld should be well wrapped, and the starting and ending arcs of the weld should be rewelded for more than 10mm.

[0044] When performing multi-layer and multi-pass welding, the slag between each layer and each pass should be thoroughly removed.

[0045] During welding, the interlayer temperature is strictly controlled and a spot thermometer is used to monitor the welding process.

[0046] Clean up the slag and spatter after welding, and grind the welds that require grinding to be smooth as required by the drawings.

[0047] Positioning welding adopts CO2 gas shielded semi-automatic welding. Positioning welds with large restraint require preheating before welding. The preheating temperature is 50℃ higher than the normal temperature preheating temperature. The gas purity of CO2 gas shielded welding should be greater than 99.5%. When the wind speed of CO2 gas shielded welding exceeds 2m / s, good wind protection measures should be taken to prevent the formation of pores in the weld.

[0048] During on-site welding, a wind and rain shelter is used for local wind protection. Construction is generally stopped on rainy days. If the work is rushed due to progress requirements, in addition to local heating and wind protection, the entire weld must be placed under the protection of an effective wind and rain shelter before construction can begin.

[0049] The working principle of the welding device for steel support structure provided in this embodiment is as follows: The two steel fixing parts 4 on the first adjusting part 2 and the second adjusting part 3 of the welding device are respectively sleeved on two different steel components 6. When fixing the steel component 6, the hand ring 442 at either end of the two-way threaded rod 441 is held and rotated to drive the two-way threaded rod 441 to rotate, and the two-way threaded rod 441 drives the two symmetrical clamping plates 45 on its outside to move, so as to achieve the effect of manually adjusting the clamping plates 45 to clamp the steel component 6. The second circular base plate 21 and the first adjusting part 2 are driven by the first motor 12 to rotate a certain angle. Since the second adjusting part 3 is fixed on the first circular base plate 11, the position of the second adjusting part 3 is fixed, so as to adjust the angle between the first adjusting part 2 and the second adjusting part 3, and then adjust the angle between the two steel components 6. The gear 413 is driven by the second motor 412 to rotate clockwise and counterclockwise, and the gear 413 drives the gear ring plate 42 meshing with it to rotate clockwise and counterclockwise. When the gear ring plate 42 rotates, it can drive the fixing block 43, the rectangular slot plate 44, The splint 45 and the steel member 6 are deflected, and the angle and direction of the two steel members 6 are further adjusted, so that the two steel members 6 can be positioned in multiple directions when welding. By driving the forward and reverse motor to drive the worm gear to rotate clockwise and counterclockwise, the worm gear drives the worm to rotate clockwise and counterclockwise, so as to adjust the position of the internal thread block 414 and the concave fixing frame 41 on the fixing seat 31, so as to achieve the effect of adjusting the spacing between the two steel members 6 to be welded, ensuring that there is an appropriate gap between the two welded steels, thereby ensuring the welding quality. When cracking or other serious defects occur in the tack welding, the cause must be found out first, and then the original tack weld is removed with a carbon arc gouging, and then the assembler repositions it. When multi-layer and multi-pass welding is performed, the slag between each layer and each pass should be thoroughly cleaned. During welding, the interlayer temperature is strictly controlled, and a spot thermometer is used to monitor the welding process. The slag and spatter are cleaned after welding. The welds required to be polished in the drawings are polished smoothly as required. CO2 gas shielded semi-automatic welding is used for tack welding, and tack welds with large restraint force must be preheated before welding.

[0050] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0051] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for a steel support structure, comprising a telescopic base plate (1) and a first circular base plate (11) fixedly connected to the top end thereof, characterized in that: The front side surface of the first circular substrate (11) is movably connected to the first adjustment portion (2) and fixedly connected to the second adjustment portion (3), and the outside of the first adjustment portion (2) and the second adjustment portion (3) are both provided with a movable steel fixing portion (4). The side surface of the first circular substrate (11) is also fixedly connected to an ear plate (111), and the ear plate (111) is provided with a welding portion (5); The steel fixing portion (4) includes a concave fixing frame (41), a concave surface of the concave fixing frame (41) is provided with a slide groove (411), a toothed ring plate (42) is slidably connected in the slide groove (411), two groups of fixing blocks (43) are fixedly connected to the toothed ring plate (42), the outside of each group of fixing blocks (43) is fixedly connected to a rectangular groove plate (44), a bidirectional threaded rod (441) is provided in the slide groove of each rectangular groove plate (44), and the outer surface of each bidirectional threaded rod (441) is provided with two symmetrical clamping plates (45), and the steel member (6) is clamped between the two clamping plates (45).

2. A welding device for a steel support structure according to claim 1, characterized in that: One end of the first adjusting portion (2) is fixedly connected to a second circular substrate (21), the second circular substrate (21) is coaxially rotatably connected to the first circular substrate (11), and a gap is provided between the second circular substrate (21) and the second adjusting portion (3).

3. A welding device for a steel support structure according to claim 2, characterized in that: A first motor (12) is mounted on the rear side of the first circular substrate (11); an output shaft of the first motor (12) movably passes through the first circular substrate (11) and is fixedly connected to the rear surface of the second circular substrate (21).

4. The welding device for a steel support structure according to claim 1, characterized in that: The first adjusting portion (2) and the second adjusting portion (3) have the same structure. The second adjusting portion (3) comprises a rectangular fixing seat (31) with a hollow interior. A worm (32) is provided in the cavity of the fixing seat (31). One end of the outer surface of the fixing seat (31) is fixedly connected to a motor box (33). The fixing seat (31) is in communication with the interior of the motor box (33).

5. The welding device for a steel support structure according to claim 4, characterized in that: A forward and reverse motor is installed inside the motor box (33), and an output end of the forward and reverse motor is fixedly connected to a worm gear via a coupling, and the worm gear is meshed with the worm (32).

6. The welding device for a steel support structure according to claim 4, characterized in that: The outer surface of the fixing seat (31) is further provided with a rectangular groove, and the outer surface of the concave fixing frame (41) is further fixedly connected with an internal thread block (414), the internal thread block (414) is threadedly penetrated on the worm (32), and the internal thread block (414) movably penetrates the rectangular groove.

7. The welding device for a steel support structure according to claim 1, characterized in that: A second motor (412) is also mounted on the side surface of the concave fixing frame (41). The output shaft of the second motor (412) movably passes through the concave fixing frame (41) and is fixedly connected to a gear (413). The gear (413) is engaged with the rack portion of the gear ring plate (42).

8. The welding device for a steel support structure according to claim 1, characterized in that: Two symmetrical mounting notches (421) are provided inside the gear ring plate (42), and two sets of fixing blocks (43) are fixedly installed in the two mounting notches (421), respectively.

9. The welding device for a steel support structure according to claim 1, characterized in that: The two ends of the bidirectional threaded rod (441) extend to the outside of the two ends of the rectangular slot plate (44), and the two ends of the bidirectional threaded rod (441) are respectively equipped with a hand ring (442) located outside the rectangular slot plate (44).

10. The welding device for a steel support structure according to claim 1, characterized in that: The welding portion (5) comprises a first connecting plate (51) fixedly connected to the rear side of the ear plate (111), one end of the first connecting plate (51) is movably connected to a second connecting plate (52), one end of the second connecting plate (52) is rotatably connected to a connecting pipe (53), and one end of the connecting pipe (53) is fixedly provided with an automatic welding head (54) for welding steel.

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