A welding device for a steel structure building

Abstract

The utility model provides a kind of welding device of steel structure building belongs to welding device technical field.It solves the problem of insufficient welding quality of existing welding device of steel structure building.The welding device of this steel structure building includes welding support and welding element being arranged on welding support, welding support includes left side plate and right side plate, left side plate and right side plate are substantially L-shaped and the side wall of each is horizontally arranged, welding support is the horizontal side wall of left side plate and right side plate upper and lower and is formed by the sliding connection of guide rail and forms ''P''-shaped component, screw rod adjusting assembly is further provided on welding support, screw rod adjusting assembly is respectively connected left side plate and right side plate and can drive both along guide rail and make relative motion, the inner side of vertical side wall of left side plate and right side plate is equipped with several gyro wheel one, the lower side of the horizontal side wall of right side plate is equipped with several gyro wheel two.The utility model has the advantages of convenient welding and good welding quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of welding equipment, and relates to a welding device for steel structure buildings. Background Technology

[0002] Steel structures are widely used in modern construction due to their advantages such as high strength, light weight, and fast construction speed. The joints of steel structure buildings, as key components connecting various parts, directly affect the safety and stability of the entire structure through their welding quality. Traditional welding methods are mostly manual, requiring workers to sit on steel beams and bend over to operate, which is not only physically demanding but also poses safety hazards.

[0003] With the development of science and technology, some welding devices for steel structures that can replace manual welding have emerged on the market. For example, a welding device and method for steel structure joints disclosed in patent literature (application number: 202411221905.1) includes a moving device, two sets of positioning devices symmetrically arranged at the bottom of the moving device, and a placement mechanism located outside the positioning devices. The placement mechanism is equipped with a welding gun. The moving device includes a moving frame and a drive motor located on the outer wall of the moving frame. The positioning device includes a fixing part, the top of which is fixedly connected to the bottom surface of the moving frame by bolts. However, this welding device has the following shortcomings in practical use:

[0004] The two bent plates and the movable frame form a "door"-shaped structure that can be locked onto the crossbeam. Since the upper ends of the two bent plates are bolted to the movable frame, the distance between the two bent plates is fixed. However, because the entire welding device needs to move on the steel beam when the moving belt rotates to facilitate welding, a gap is left between the bent plates and the crossbeam to ensure smooth movement of the welding device, considering the influence of frictional resistance. This results in the bent plates and crossbeam not fitting tightly together, making it difficult to guarantee the positional accuracy of the welding device, thus affecting welding precision. Furthermore, insufficient fit between the bent plates and the crossbeam can cause the welding device to wobble during welding, causing the welding torch's oscillation trajectory to deviate from the predetermined path, further exacerbating the impact on welding quality. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a welding device for steel structure buildings. This invention solves the problem of insufficient welding quality in existing welding devices for steel structure buildings while ensuring welding convenience.

[0006] The objective of this utility model can be achieved through the following technical solution: A welding device for steel structure buildings, comprising a welding bracket and welding elements disposed on the welding bracket, characterized in that the welding bracket comprises a left side plate and a right side plate, both of which are approximately L-shaped and each has one side wall horizontally disposed, the welding bracket is a “П”-shaped component formed by the horizontal side walls of the left and right side plates facing each other vertically and being slidably connected by a guide rail, the other side walls of the left and right side plates are both vertically disposed and perpendicular to the guide rail, the welding bracket is also provided with a screw adjustment assembly, the screw adjustment assembly is respectively connected to the left and right side plates and can drive the two to move relative to each other along the guide rail, the inner side of the vertical side wall of the left and right side plates is provided with a plurality of rollers, and the lower side of the horizontal side wall of the right side plate is provided with a plurality of rollers.

[0007] In this welding device, the welding support consists of a roughly L-shaped left and right side plate. The horizontally positioned sidewalls of the left and right side plates are aligned vertically and slidably connected by guide rails, forming a "П"-shaped component. This facilitates the placement of the welding support onto the beams of the steel structure from top to bottom. Simultaneously, because the guide rails are perpendicular to the vertical sidewalls of the left and right side plates, the screw adjustment mechanism can use the guide rails to drive the left and right side plates to move relative to each other, adjusting the distance between their vertical sidewalls.

[0008] Building upon this, the welding device also features roller 1 on the inner side of the vertical sidewalls of both the left and right side plates, and several roller 2 on the lower side of the horizontal sidewall of the right side plate. When the screw adjustment mechanism moves the left and right side plates toward each other, each roller 1 gradually approaches and eventually abuts against the side of the crossbeam. Simultaneously, the screw adjustment assembly has a self-locking function when the screw is not rotating, ensuring that the relative positions of the left and right side plates are fixed after adjustment. Furthermore, due to gravity, each roller 2 also abuts against the top surface of the crossbeam. This structural improvement allows both roller 1 and roller 2 to firmly abut against the crossbeam, resulting in rolling contact between the welding device and the crossbeam. This ensures that the welding device can move smoothly and stably along the crossbeam to the desired welding node, guaranteeing welding convenience. Meanwhile, during the welding process, because roller one and roller two are in close contact with the crossbeam, the welding device is guaranteed to have high positional accuracy and good stability, and is not prone to shaking. This ensures that the welding trajectory of the welding component is consistent with the preset trajectory, thereby greatly improving the welding accuracy.

[0009] In the welding device of the above-mentioned steel structure building, the horizontal sidewall of the left side plate is located above the horizontal sidewall of the right side plate. The horizontal sidewall of the right side plate is provided with a clearance notch. A motor is fixedly connected to the horizontal sidewall of the left side plate, and a traveling wheel is connected to the rotating shaft of the motor. The lower part of the motor and the lower part of the traveling wheel both pass through the clearance notch, and the lower edge of the traveling wheel is flush with the lower edge of the second roller.

[0010] By setting up traveling wheels with their lower edges flush with the lower edge of roller two, both traveling wheels and roller two rest against the top surface of the crossbeam. When the motor drives the traveling wheels to rotate, the welding device can move automatically on the crossbeam. When it moves to the required welding node, the traveling wheels can stop, keeping the welding bracket stationary so that the welding element can perform the welding work.

[0011] During welding, the vertical distance between the center of gravity of the upper part of the welding device and the support point of the crossbeam affects the stability of the welding device. Assuming the motor and wheels are directly mounted on the lower side of the right side plate, although installation is more convenient, the vertical distance between the center of gravity of the upper part of the welding device and the support point of the crossbeam is large, making the welding device prone to instability. In this welding device, by setting a clearance notch on the horizontal sidewall of the right side plate, the motor and wheels are both mounted on the left side plate, with the lower parts of the motor and wheels passing through the clearance notch. This structure reduces the distance the welding device is above the crossbeam, lowering the center of gravity and enhancing its anti-tipping ability, thereby greatly improving the stability and welding quality during the welding process.

[0012] In the welding device of the above-mentioned steel structure building, the outer circumference of the wheel hub of the walking wheel is covered with a rubber layer or a plastic layer, the cross-section of the horizontal sidewall of the left side plate is convex, the middle of its outer side surface protrudes upward, and the inner side surface is recessed at the corresponding protrusion position to form a mounting groove, and the upper part of the motor and the upper part of the walking wheel are both embedded in the mounting groove.

[0013] The outer circumference of the wheel hub is covered with a rubber or plastic layer, which generates sufficient static friction after the wheel stops to position the welding bracket at the corresponding welding station. The recessed mounting design conceals the wheel, providing dust, sun, and rain protection. It also prevents molten metal from splashing onto the wheel during welding, protecting the rubber or plastic layer and reducing the risk of aging and damage. This ensures the wheel's linear accuracy, allowing the welding device to stop precisely at the programmed position each time, thus improving welding precision. Furthermore, in this design, the horizontal sidewall of the left plate only protrudes slightly upwards to accommodate the motor and wheel. This concealed wheel design lowers the center of gravity of the left sidewall, reducing the overall center of gravity of the welding device and enhancing its anti-tipping ability. This further improves the stability and welding quality during the welding process.

[0014] In the aforementioned welding device for steel structure buildings, each roller is distributed on both sides of the clearance gap. This distribution not only ensures stable support for the welding bracket, improving stability during the movement of the welding device and the welding process, thus enhancing welding quality, but also allows the rollers to avoid interfering with the traveling wheels, resulting in a more rational spatial design.

[0015] In the aforementioned welding device for steel structures, two guide rails are used. Both guide rails are mounted on the upper side of the horizontal sidewall of the right side plate, while a slider that slides along the guide rails is fixedly connected to the horizontal sidewall of the left side plate. The cooperation of the two guide rails and the sliders enhances the stability and adjustment accuracy during the width adjustment of the welding support, ensuring that the welding components can be welded precisely along the preset trajectory, thus improving weld quality. Simultaneously, the two guide rails can evenly distribute external forces, reducing the stress and deformation of a single guide rail and extending its service life.

[0016] In the aforementioned welding device for steel structure buildings, the lead screw adjustment assembly includes a lead screw parallel to the guide rail. A lead screw seat is fixedly connected to the horizontal side wall of the left side plate, and a connecting plate is fixedly connected to the right side plate. The rod portion of the lead screw passes through the connecting plate and is threadedly connected to the lead screw seat, and the head of the lead screw can abut against the side of the connecting plate. By rotating the lead screw, the left and right side plates can move relative to each other along the guide rail, thereby adjusting the width of the welding device to accommodate the welding of beams of different sizes. Simultaneously, since the lead screw adjustment can stop at any position with extremely high adjustment precision, it ensures that the left and right side plates remain stable after being adjusted to the appropriate position, and that the rollers accurately abut against the side of the beam, thereby improving the stability of the welding support and the welding quality.

[0017] In the aforementioned welding device for steel structures, there are two lead screws, parallel to each other and spaced apart. There are also two lead screw seats, with each lead screw threaded into one of the two seats. The two lead screws ensure more even force distribution on the left and right side plates during relative movement, avoiding the tilting or movement deviation problems that can occur with a single lead screw. This ensures precise relative movement of the left and right side plates along the guide rail, enabling more accurate spacing adjustment. During welding, this double-lead screw structure better maintains the positional accuracy of the welding device, resulting in a more stable and precise welding trajectory, further improving welding quality.

[0018] In the aforementioned welding device for steel structure buildings, both roller one and roller two are cylindrical. The axis of roller one is vertically oriented, while the axis of roller two is horizontally oriented. All roller twos are located on the same horizontal plane, and all roller ones on the same side are located on the same vertical plane. The cylindrical shape and vertical axis of roller one, along with the fact that all roller ones on the same side are located on the same vertical plane, ensure that each roller one can closely fit the side of the beam. Similarly, each roller two can closely fit the top surface of the beam. This structure prevents the welding device from shaking or jamming due to positional deviations of roller one and roller two during movement and welding, thereby improving the stability of the welding device during movement and the welding accuracy during the welding process.

[0019] In the aforementioned welding device for steel structure buildings, this welding device also includes several U-shaped roller supports. Each roller 1 and each roller 2 are connected to the corresponding left or right side plate via a roller support. The design of the U-shaped roller supports provides independent and stable support for roller 1 and roller 2, enabling roller 1 and roller 2 to maintain a good stress state and high stability when in contact with the crossbeam. This makes the movement of the welding device smoother, the welding process more stable, and further improves the welding quality and welding convenience.

[0020] In the aforementioned welding device for steel structure buildings, the welding element includes two welding robots, which are respectively positioned on the outer surfaces of the vertical sidewalls of the left and right sides. The lower ends of the vertical sidewalls of both the left and right sides are bent outwards to form supporting flanges, and a welding machine is fixedly connected to each supporting flange. Positioning the two welding robots on the outer surfaces of the vertical sidewalls of the left and right sides allows welding operations to be performed simultaneously from both sides, greatly improving welding efficiency and making the welding process more convenient. The outward bending of the lower ends of the vertical sidewalls of the left and right sides to form supporting flanges provides a stable mounting platform for the welding machine, improving its installation stability. Furthermore, the placement of one welding robot and one welding machine on each side of the welding support creates a symmetrical weight distribution, effectively reducing swaying or instability caused by a shift in the center of gravity during movement or welding. Moreover, by directly mounting the welding machine on the welding bracket, the weight of the welding machine can be used to increase the frictional resistance between the traveling wheels and the crossbeam. This allows the welding device to be more stably fixed on the crossbeam when the traveling wheels stop, preventing the welding device from shaking randomly and thus significantly improving the welding quality.

[0021] Compared with existing technologies, the welding equipment for this steel structure building has the following advantages:

[0022] 1. In this welding device, both roller one and roller two can be closely abutted against the crossbeam, and the welding device and the crossbeam are in rolling contact. This allows the welding device to move smoothly and stably along the crossbeam to the required welding node, ensuring the convenience of welding.

[0023] 2. During the welding process, because roller one and roller two are in close contact with the crossbeam, the positional accuracy and stability of the welding device are guaranteed, and it is not easy to shake. This ensures that the welding trajectory of the welding component is consistent with the preset trajectory, thereby greatly improving the welding accuracy.

[0024] 3. In this welding device, the lead screw adjustment structure can drive the left and right side plates to move relative to each other via the guide rail, and can adjust the distance between the left and right side plates, so that this welding device can be used for beams of different widths, thus having the advantage of good versatility. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the welding device.

[0026] Figure 2 This is a three-dimensional structural diagram of the welding device with the welding robot hidden at the top.

[0027] Figure 3 This is a partial front view of the welding apparatus.

[0028] Figure 4This is a structural diagram of the right side plate, guide rail, and lead screw adjustment assembly.

[0029] Figure 5 This is a top view of the welding apparatus.

[0030] Figure 6 yes Figure 5 Sectional view of AA.

[0031] Figure 7 This is a partial structural diagram of the welding apparatus.

[0032] Figure 8 This is a schematic diagram of the welding equipment in use.

[0033] In the diagram, 1. Welding bracket; 1a1. Left side plate; 1a2. Right side plate; 1b. Clearance notch; 1c. Mounting groove; 1d. Support flange; 2. Guide rail; 3. Screw adjustment assembly; 31. Screw; 32. Screw seat; 33. Connecting plate; 4. Roller 1; 5. Roller 2; 6. Motor; 7. Traveling wheel; 8. Roller bracket; 9. Welding robot; 10. Slider; 11. Welding machine. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] like Figure 1 and Figure 2 As shown, the welding device for this steel structure building includes a welding bracket 1 and welding elements mounted on the welding bracket 1. The welding bracket 1 includes a left side plate 1a1 and a right side plate 1a2. Both the left side plate 1a1 and the right side plate 1a2 are approximately L-shaped, and one side wall of each is horizontally arranged. The welding bracket 1 is a "П"-shaped component formed by the horizontal side walls of the left side plate 1a1 and the right side plate 1a2 facing each other vertically and slidingly connected by a guide rail 2. The other side wall of the left side plate 1a1 and the right side plate 1a2 is vertically arranged and perpendicular to the guide rail 2. The welding elements include two welding robots 9, which are respectively mounted on the outer surfaces of the vertical side walls of the left side plate 1a1 and the right side plate 1a2. The lower ends of the vertical side walls of the left side plate 1a1 and the right side plate 1a2 are bent outward to form supporting flanges 1d, and a welding machine 11 is fixedly connected to each supporting flange 1d.

[0036] like Figures 2 to 4As shown, the welding bracket 1 is also equipped with a lead screw adjustment assembly 3. The lead screw adjustment assembly 3 is connected to the left side plate 1a1 and the right side plate 1a2 respectively and can drive the left side plate 1a1 and the right side plate 1a2 to move relative to each other along the guide rail 2. Rollers 1-4 are provided on the inner side of the vertical sidewall of the left side plate 1a1 and the right side plate 1a2, and rollers 2-5 are provided on the lower side of the horizontal sidewall of the right side plate 1a2. Rollers 1-4 and rollers 2-5 are both cylindrical. The axis of roller 1-4 is set vertically, and the axis of roller 2-5 is set horizontally. All rollers 2-5 are located on the same horizontal plane, and all rollers 1-4 on the same side are located on the same vertical plane. Furthermore, each roller 1-4 and each roller 2-5 is connected to the corresponding left side plate 1a1 or right side plate 1a2 through a U-shaped roller bracket 8.

[0037] like Figures 2 to 4 As shown, specifically, the horizontal sidewall of the left plate 1a1 is located above the horizontal sidewall of the right plate 1a2. The horizontal sidewall of the right plate 1a2 has an avoidance notch 1b. The horizontal sidewall of the left plate 1a1 is equipped with a traveling wheel 7 driven by a motor 6, and this traveling wheel 7 can brake to a stop. Combined with... Figure 5 and Figure 6 As shown, the lower part of the traveling wheel 7 passes through the clearance notch 1b, and the lower edge of the traveling wheel 7 is flush with the lower edge of the roller 5. The motor 6 is preferably a servo motor 6, which can lock the rotating shaft to prevent it from rotating freely when it is not rotating, thus allowing the traveling wheel 7 to stop. Simultaneously, to ensure the smoothness of the traveling wheel 7's movement and its stability after stopping, the outer circumference of the wheel hub of the traveling wheel 7 is covered with a rubber or plastic layer. When the motor 6 drives the traveling wheel 7 to rotate, the welding device can move automatically on the crossbeam. When the traveling wheel 7 stops at the required welding node, it ensures good stability of the welding device during the welding process. Therefore, while achieving automatic movement to improve welding convenience, it also results in high welding quality.

[0038] like Figure 4 As shown, there are four rollers 2 5, which are evenly distributed on both sides of the clearance notch 1b. There are two guide rails 2, both of which are set on the upper side of the horizontal sidewall of the right side plate 1a2, and a slider 10 that is slidably connected to the guide rails 2 is fixedly connected to the horizontal sidewall of the left side plate 1a1.

[0039] like Figures 4 to 6As shown, the lead screw adjustment assembly 3 includes a lead screw 31 parallel to the guide rail 2. A lead screw seat 32 is fixedly connected to the horizontal side wall of the left side plate 1a1, and a connecting plate 33 is fixedly connected to the right side plate 1a2. The rod of the lead screw 31 passes through the connecting plate 33 and is threadedly connected to the lead screw seat 32. The head of the lead screw 31 can abut against the side of the connecting plate 33. By rotating the lead screw 31, the left side plate 1a1 and the right side plate 1a2 can move relative to each other along the guide rail 2, thereby adjusting the width of the welding device to accommodate the welding of beams of different sizes. There are two lead screws 31, which are parallel to each other and spaced apart. There are also two lead screw seats 32, with each lead screw 31 threadedly connected to one of the two lead screw seats 32.

[0040] Alternatively, the lead screw adjustment assembly can also have a servo motor mounted on the upper side of the horizontal sidewall of the left plate 1a1, with a lead screw 31 coaxially fixed to the shaft of the servo motor, and a lead screw seat 32 fixedly connected to the upper sidewall of the right plate 1a2, with the lead screw 31 and the lead screw seat 32 threaded together. This method achieves automatic adjustment of the distance between the vertical sidewalls of the left plate 1a1 and the right plate 1a2, offering the advantage of a high degree of automation.

[0041] like Figure 7 As shown, the cross-section of the horizontal sidewall of the left side plate 1a1 is convex, with the middle of its outer side convex upwards and the inner side recessed at the corresponding position of the convexity to form a mounting groove 1c, combined with... Figure 3 As shown, the lower part of the motor 6 passes through the clearance notch 1b, and the upper part of the motor 6 and the upper part of the traveling wheel 7 are both embedded in the mounting groove 1c.

[0042] The working principle of this welding device is briefly described below:

[0043] Step 1: As Figure 8 As shown, when welding work is required, the welding device is placed on the crossbeam of the steel structure building from top to bottom. At this time, due to gravity, the traveling wheel 7 and roller 2 5 abut against the top surface of the crossbeam, while there is still a gap between each roller 4 on the welding bracket 1 and the side wall of the crossbeam, which facilitates the placement of the welding device.

[0044] Step 2: Rotate the lead screw 31. As the lead screw 31 rotates, it drives the left side plate 1a1 and the right side plate 1a2 to move towards each other via the guide rail 2, shortening the distance between the vertical sidewalls of the left side plate 1a1 and the right side plate 1a2 until all rollers 4 are abutting against the side of the crossbeam. After adjustment, stop rotating the lead screw 31, and the left side plate 1a1 and the right side plate 1a2 maintain their current relative positions.

[0045] Step 3: Control motor 6 to start working, driving the traveling wheels 7 to rotate, moving the entire welding device along the crossbeam towards the beam-column joint. When it reaches the welding station, the traveling wheels 7 stop. Then, the welding process begins, with the welding robot 9 driving the welding torch to weld the joint between the crossbeam and the column. After welding is complete, motor 6 can be restarted to move the welding device to the beam-column joint at the other end of the crossbeam for further welding.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0047] Although this document frequently uses terms such as 1. welding bracket; 1a1. left side plate; 1a2. right side plate; 1b. clearance notch; 1c. mounting groove; 2. guide rail; 3. lead screw adjustment assembly; 31. lead screw; 32. lead screw seat; 33. connecting plate; 4. roller one; 5. roller two; 6. motor; 7. traveling wheel; 8. roller bracket; 9. welding robot; 10. support flange; 11. welding machine; 12. slider, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A welding apparatus for a steel structure building, comprising a welding support (1) and welding elements disposed on the welding support (1), characterized in that, The welding bracket (1) includes a left side plate (1a1) and a right side plate (1a2). The left side plate (1a1) and the right side plate (1a2) are both roughly L-shaped and one of their side walls is horizontally arranged. The welding bracket (1) is a "П"-shaped component formed by the horizontal side walls of the left side plate (1a1) and the right side plate (1a2) facing each other vertically and slidingly connected by a guide rail (2). The other side wall of the left side plate (1a1) and the right side plate (1a2) are both vertically arranged and perpendicular to the guide rail (2). The welding bracket (1) is also provided with a screw adjustment assembly (3). The screw adjustment assembly (3) is connected to the left side plate (1a1) and the right side plate (1a2) respectively and can drive them to move relative to each other along the guide rail (2). The inner side of the vertical side wall of the left side plate (1a1) and the right side plate (1a2) are provided with several rollers (4). The lower side of the horizontal side wall of the right side plate (1a2) is provided with several rollers (5).

2. The welding apparatus for steel structure buildings according to claim 1, characterized in that, The horizontal sidewall of the left side plate (1a1) is located above the horizontal sidewall of the right side plate (1a2). The horizontal sidewall of the right side plate (1a2) is provided with a clearance notch (1b). A motor (6) is fixedly connected to the horizontal sidewall of the left side plate (1a1), and a traveling wheel (7) is connected to the shaft of the motor (6). The lower part of the motor (6) and the lower part of the traveling wheel (7) both pass through the clearance notch (1b), and the lower edge of the traveling wheel (7) is flush with the lower edge of the roller (5).

3. The welding apparatus for steel structure buildings according to claim 2, characterized in that, The outer circumference of the hub of the walking wheel (7) is covered with a rubber layer or a plastic layer. The cross-section of the horizontal sidewall of the left side plate (1a1) is convex. The middle part of its outer side protrudes upward, and the inner side is recessed at the position corresponding to the protrusion to form a mounting groove (1c). The upper part of the motor (6) and the upper part of the walking wheel (7) are both embedded in the mounting groove (1c).

4. The welding apparatus for steel structure buildings according to claim 2 or 3, characterized in that, Each roller (5) is distributed on both sides of the clearance gap (1b).

5. The welding apparatus for steel structure buildings according to claim 2 or 3, characterized in that, The number of guide rails (2) is two. Both guide rails (2) are set on the upper side of the horizontal sidewall of the right side plate (1a2). A slider (10) that is slidably connected to the guide rails (2) is fixedly connected to the horizontal sidewall of the left side plate (1a1).

6. The welding apparatus for steel structure buildings according to claim 2 or 3, characterized in that, The lead screw adjustment assembly (3) includes a lead screw (31) parallel to the guide rail (2), a lead screw seat (32) fixedly connected to the horizontal side wall of the left side plate (1a1), and a connecting plate (33) fixedly connected to the right side plate (1a2). The rod of the lead screw (31) passes through the connecting plate (33) and is threadedly connected to the lead screw seat (32). The head of the lead screw (31) can abut against the side of the connecting plate (33).

7. The welding apparatus for steel structure buildings according to claim 6, characterized in that, There are two lead screws (31), which are parallel to each other and spaced apart. There are two lead screw seats (32), and the two lead screws (31) are threadedly connected to the two lead screw seats (32) respectively.

8. The welding apparatus for steel structure buildings according to claim 1, 2, or 3, characterized in that, Both roller 1 (4) and roller 2 (5) are cylindrical. The axis of roller 1 (4) is set vertically, and the axis of roller 2 (5) is set horizontally. All roller 2 (5) are located on the same horizontal plane, and all roller 1 (4) on the same side are located on the same vertical plane.

9. The welding apparatus for steel structure buildings according to claim 1, 2, or 3, characterized in that, The welding device also includes several U-shaped roller brackets (8), each roller one (4) and each roller two (5) is connected to the corresponding left side plate (1a1) or right side plate (1a2) through a roller bracket (8).

10. The welding apparatus for steel structure buildings according to claim 1, 2, or 3, characterized in that, The welding element includes two welding robots (9), which are respectively set on the outer side of the vertical sidewall of the left side plate (1a1) and the right side plate (1a2). The lower ends of the vertical sidewall of the left side plate (1a1) and the right side plate (1a2) are bent outward to form a support flange (1d), and a welding machine (11) is fixedly connected to each support flange (1d).

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