Fabricated building steel structure welding device

Abstract

The application belongs to the field of steel structure welding equipment and provides an assembled building steel structure welding device, which comprises a rectangular square frame composed of four L-shaped corner frames spliced at the head and tail, the L-shaped corner frames are adjusted in length by cooperating with the inner rod and the telescopic groove, and the first adjusting screw rod is arranged to realize the fine adjustment of the overall size of the square frame to adapt to different specifications of steel columns; the adjustable clamping mechanism and the sliding assembly are arranged at the bottom of the square frame, the adjustable clamping mechanism realizes the accurate clamping and position fine adjustment of the steel structure ear plate through the stud bolt, the second adjusting screw rod, and the same side second adjusting screw rod is matched with the square rod and the adjusting sleeve rod to realize synchronous adjustment. The application can realize the accurate welding of the ear plates at both ends of the steel column, does not need repeated calibration and positioning, is suitable for multiple specifications of steel columns, greatly improves the welding consistency, precision and operation efficiency, solves the problems of large deviation, complicated displacement and poor stability in the traditional steel structure ear plate welding alignment, and is suitable for batch welding operation of the assembled building steel column.

Description

Technical Field

[0001] This invention belongs to the field of steel structure welding equipment, and particularly relates to a welding device for prefabricated building steel structures. Background Technology

[0002] Prefabricated steel structures have become the mainstream structural form in modern construction projects due to their advantages such as light weight, fast construction speed, high degree of industrialization, energy saving and environmental protection. Steel columns are the core load-bearing components of steel structure buildings, and the ear plates at the ends of the steel columns are key components for the butt joint connection between steel columns. The welding position accuracy of the ear plates directly determines the overall assembly accuracy and structural stability of the steel structure.

[0003] Currently, most steel column ear plate welding operations use manual positioning and simple clamps for fixing. This method has many drawbacks: manual positioning has a large error, it is difficult to guarantee the symmetry and coaxiality of the ear plates at both ends of the steel column, the welding position of the ear plates of different steel columns is inconsistent, and problems such as misalignment and loose splicing are likely to occur during subsequent steel column docking and installation, which seriously affects the construction quality. Summary of the Invention

[0004] The purpose of this invention is to provide a welding device for prefabricated building steel structures, which aims to solve the technical problem of low positioning accuracy in the prior art.

[0005] The present invention is implemented as follows: a prefabricated steel structure welding device includes four L-shaped corner frames, which are spliced ​​end to end to form a rectangular welding frame; one end of each L-shaped corner frame is fixedly connected to an inner rod, and the other end is provided with a telescopic groove adapted to the inner rod; two adjacent L-shaped corner frames are slidably inserted into each other through the inner rod and the telescopic groove; a first adjusting screw is rotatably installed on the side of each L-shaped corner frame, and one end of the first adjusting screw extends into the telescopic groove and is threadedly connected to the inner rod.

[0006] Each L-shaped corner bracket is symmetrically equipped with two sets of adjustable clamping mechanisms at its bottom. The two sets of adjustable clamping mechanisms are located on both sides of the welding frame and are used to clamp and accurately position the steel column ear plates. Each L-shaped corner bracket is also equipped with two sets of sliding components at its bottom. The two sets of sliding components are located on both sides of the welding frame and are used to support the welding frame and assist the welding frame in sliding along the side wall of the steel column.

[0007] The adjustable clamping mechanism includes a slide rail fixed to the bottom of the L-shaped bracket, a slider slidably mounted on the bottom of the slide rail, two sets of clamping plates slidably mounted on the slider, a double-ended screw rotatably mounted in the middle of the slider, and the two sets of clamping plates respectively threaded to the threaded sections at both ends of the double-ended screw; a second adjusting screw rotatably mounted at the end of the slide rail, and the second adjusting screw is threadedly connected to the slider.

[0008] Two second adjusting screws on the same side of the welding frame are fixedly connected to square rods at their ends. The same adjusting sleeve rod is slidably sleeved between the two square rods, and the threads of the two second adjusting screws on the same side of the welding frame are opposite. A driving nut is fitted on the outside of the adjusting sleeve rod to drive the adjusting sleeve rod to rotate synchronously.

[0009] The sliding assembly includes a mounting bracket fixed to the bottom of the L-shaped corner frame. Several rollers are rotatably mounted on the inner side of the mounting bracket, and the rollers roll against the side wall of the steel column. Sleeves are fixed to the ends of the two mounting brackets on the same side of the welding frame, and a movable rod is slidably inserted between the two sleeves.

[0010] Furthermore, the sliding assembly is equipped with a stabilizing assembly, which includes a fixed cylinder fixed to the outside of the sleeve. A connecting rod is hinged to the fixed cylinder, and the ends of two adjacent connecting rods are hinged by a pin. A permanent magnet is fixedly installed on the outside of the pin.

[0011] Furthermore, a non-metallic mounting plate is fixedly mounted on the side of the permanent magnet facing the steel column, and a number of evenly distributed balls are embedded on the surface of the mounting plate, the balls making rolling contact with the side wall of the steel column.

[0012] Furthermore, the device also includes an auxiliary support mechanism, which includes a base plate on which at least four sets of hydraulic telescopic rods are fixedly installed. The telescopic ends of the hydraulic telescopic rods are fixedly connected to a placement frame adapted for placing the steel column, and the width of the placement frame is greater than the width of the rectangular welded frame.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. High welding positioning accuracy and good component consistency. This invention achieves mechanical clamping and precise fine-tuning of the ear plates through an adjustable clamping mechanism, combined with a synchronous adjustment structure for double ear plates on the same side, ensuring symmetrical distribution of ear plates on both sides of the steel column; and the overall positioning benchmark of the tooling is unified, the welding frame does not shift during the welding process, and the welding position height of the ear plates at both ends of the steel column and multiple steel columns is uniform, completely solving the problems of large deviation and poor docking accuracy of manual positioning, and greatly improving the assembly quality of steel structures.

[0015] 2. High versatility and wide adaptability. The inner rod can be extended and retracted by the first adjusting screw, and the length and width of the rectangular welding frame can be freely adjusted. It can adapt to steel column components of different widths and specifications without changing tooling, reducing equipment investment costs and making it applicable to a wider range of scenarios.

[0016] 3. Significantly improved work efficiency. The adjustment sleeve rod synchronously drives the two second adjustment screws on the same side to rotate, realizing synchronous alignment adjustment of the double ear plates, which doubles the efficiency compared to individual adjustment; at the same time, the welding frame can slide freely along the steel column through the sliding component, and continuous welding of the ear plates at both ends of the steel column can be completed after a single clamping and positioning, without the need for repeated disassembly and calibration, making it suitable for batch welding operations.

[0017] 4. Excellent operational stability and no shaking during welding. The sleeve and movable rod work together to achieve linkage reinforcement of the sliding components on the same side. The connecting rod and permanent magnet adsorption stabilize the structure, ensuring that the rollers are always in close contact with the side wall of the steel column, effectively preventing shaking and displacement during welding and relocation of the welding frame. The non-metallic mounting plate with ball bearing structure reduces sliding friction while ensuring stable adsorption, balancing stability and smooth sliding.

[0018] 5. Automated auxiliary support for convenient and labor-saving operation. The auxiliary mechanism can independently adjust its height via a hydraulic telescopic rod, and can adaptively avoid the movement path of the welding frame. Welding of both ends of the entire steel column can be completed without hoisting or moving the steel column, simplifying the operation process, reducing manual labor intensity, and improving construction safety. Attached Figure Description

[0019] Figure 1 This is a top view of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall front view of the present invention.

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the L-shaped corner bracket in this invention.

[0022] Figure 4 This is a partial structural diagram of the adjustable clamping mechanism in this invention.

[0023] Figure 5 This is a schematic diagram of the sliding component in this invention.

[0024] Figure 6 This is a schematic diagram of the installation structure of the auxiliary mechanism and steel column in this invention.

[0025] Figure 7 This is a schematic diagram of the installation structure of the welding frame in this invention.

[0026] In the attached diagram: 1. First adjusting screw; 2. L-shaped bracket; 3. Inner rod; 4. Adjustable clamping mechanism; 41. Clamping plate; 42. Slide rail; 43. Second adjusting screw; 44. Square rod; 45. Adjusting sleeve rod; 46. Double-ended screw; 47. Slider; 5. Sliding assembly; 51. Mounting bracket; 52. Roller; 53. Sleeve; 54. Movable rod; 6. Stabilizing assembly; 61. Ball bearing; 62. Mounting plate; 63. Permanent magnet; 64. Connecting rod; 65. Fixed cylinder; 7. Telescopic groove; 8. Auxiliary mechanism; 81. Base plate; 82. Hydraulic telescopic rod; 83. Placement frame; 9. Steel column; 10. Ear plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0029] like Figures 1-7 As shown, this invention provides a prefabricated steel structure welding device, comprising four L-shaped corner frames 2, which are installed end-to-end to form a rectangular welding frame, serving as the main frame of the overall welding positioning fixture. One end of each L-shaped corner frame 2 is fixedly welded with an inner rod 3, and the other end of the L-shaped corner frame 2 has an expansion groove 7. The inner rod 3 is clearance-fitted with the expansion groove 7, and the inner rods 3 of adjacent L-shaped corner frames 2 are slidably inserted into the corresponding expansion grooves 7, achieving overall expansion and contraction adjustment of the square frame. Each L-shaped corner frame 2 has a first adjusting screw 1 rotatably mounted on its side, with one end extending into the expansion groove 7 and threadedly connected to the inner rod 3 on another L-shaped corner frame 2. By turning the first adjusting screw 1, the inner rod 3 can be driven to slide and contract within the expansion groove 7, thereby changing the overall length and width of the square frame and achieving the adaptable installation of steel columns 9 of different specifications.

[0030] Two adjustable clamping mechanisms 4 are installed at the bottom of each L-shaped corner bracket 2. The two adjustable clamping mechanisms 4 are located on both sides of the welding frame. The adjustable clamping mechanisms 4 are used to clamp the ear plate 10 and can precisely adjust the welding position of the ear plate 10.

[0031] Two sliding components 5 are installed at the bottom of each L-shaped bracket 2. The two sliding components 5 are located on both sides of the welding frame. After the welding frame is installed on the steel column 9, one end of the sliding component 5 abuts against the side of the steel column 9. The sliding component 5 is used to assist the welding frame in sliding on the steel column 9, so that the welding frame can move at both ends of the steel column 9 to weld the ear plate 10 to both ends of the steel column 9.

[0032] In use, first increase the length and width of the welding frame. Specifically, simultaneously turn the first adjusting screw 1 on the opposite side. The first adjusting screw 1 will drive the inner rod 3 to move, thereby causing the inner rod 3 to exit from the telescopic groove 7, thus increasing the length and width of the welding frame. Then, place the welding frame on the end of the steel column 9, and then adjust the welding frame in the opposite direction so that the multiple sliding components 5 surround the steel column 9. Then, place all the ear plates 10 at the output ends of the multiple adjustable clamping mechanisms 4, and adjust the position of the ear plates 10 to the welding position. Then, the ear plates 10 can be welded to the steel column 9. After welding is completed, operate the adjustable clamping machine. The mechanism 4 releases the ear plate 10 without adjusting the position of the adjustable clamping mechanism 4, then pushes the welding frame to move to the other end of the steel column 9, clamps another batch of ear plates 10 on the adjustable clamping mechanism 4, and then performs welding. Then, another steel column 9 is placed on one end of the steel column 9, and the welding frame is moved to the other steel column 9. Then, the ear plates 10 are welded. In this way, all steel columns 9 can be welded. Since the position of the adjustable clamping mechanism 4 has not changed, the positions of the ear plates 10 at both ends of the steel column 9 will correspond one by one, ensuring the accuracy of the connection between the ear plates 10 on different steel columns 9.

[0033] In addition, the size of this device can be adjusted according to the width of the steel column 9 to accommodate steel columns 9 of different specifications.

[0034] The present invention provides a prefabricated building steel structure welding device. In this embodiment, the adjustable clamping mechanism 4 includes a slide rail 42 fixedly installed on an L-shaped corner bracket 2. A slider 47 is slidably installed at the bottom of the slide rail 42. Two clamping plates 41 are slidably installed on the slider 47. A double-ended screw 46 is also rotatably installed on the slider 47. The two clamping plates 41 are respectively threaded to the two ends of the threaded end of the double-ended screw 46. A second adjusting screw 43 is rotatably installed on the slide rail 42. The second adjusting screw 43 is threadedly connected to the slider 47.

[0035] After the welding frame is installed in place, the ear plate 10 is placed between the two clamping plates 41. Then, the double-ended screw 46 is rotated, which drives the two clamping plates 41 to move towards each other. The two clamping plates 41 clamp and fix the ear plate 10. Then, the second adjusting screw 43 is rotated, which drives the slider 47 to move. The slider 47 drives the ear plate 10 to move, thereby adjusting the position of the ear plate 10 and thus performing precise welding on the ear plate 10.

[0036] First, spot weld all the ear plates 10, then loosen the clamp 41, remove the welding frame, and finally fully weld the ear plates 10.

[0037] The present invention provides a prefabricated steel structure welding device. Since the two ear plates 10 on the same side of the steel column 9 are symmetrically distributed about the center line of the steel column 9, in order to facilitate the adjustment of the position of the ear plates 10, in this embodiment, a square rod 44 is fixedly connected to the end of each second adjusting screw 43, and the same adjusting sleeve rod 45 is slidably installed between the two square rods 44 on the same side of the welding frame. The threads of the two second adjusting screws 43 on the same side of the welding frame are opposite.

[0038] Specifically, two square rods 44 are slidably mounted at both ends of the adjusting sleeve rod 45, and the adjusting sleeve rod 45 is provided with nuts for rotating the adjusting sleeve rod 45.

[0039] Rotating the nut causes the adjusting sleeve 45 to rotate, which in turn causes the two square rods 44 to rotate. The square rods 44 then cause the second adjusting screw 43 to rotate, thereby adjusting the position of the ear plate 10. Rotating the adjusting sleeve 45 allows for simultaneous adjustment of the positions of the two ear plates 10, which can improve work efficiency.

[0040] Meanwhile, when adjusting the welding frame, the square rod 44 will slide within the adjusting sleeve rod 45 without affecting the adjustment of the welding frame.

[0041] The present invention provides a prefabricated building steel structure welding device. In this embodiment, the sliding component 5 includes a mounting frame 51 fixedly installed on the L-shaped corner frame 2. Multiple rollers 52 are rotatably installed on the mounting frame 51. The rollers 52 are made of wear-resistant rubber material and can roll in close contact with the side wall of the steel column 9.

[0042] After the welding frame is fitted onto the steel column 9, the welding frame is adjusted to a smaller size so that all the rollers 52 abut against the side wall of the steel column 9, so that the welding frame is mounted around the steel column 9. When the welding frame is pushed, the rollers 52 roll on the steel column 9 to reduce the friction between the welding frame and the steel column 9, making the welding frame easier to move.

[0043] The present invention provides a prefabricated steel structure welding device. Since the end of the ear plate 10 is flush with the end of the steel column 9, and the welding frame needs to be moved off the ear plate 10 when the welding frame moves, the other end of the clamping plate 41 is an open end. As a result, all the mounting frames 51 cannot see each other, which leads to the unstable installation of one end of the mounting frame 51. This makes it easy for the welding frame to shake on the steel column 9, affecting the welding accuracy. In order to make the end of the sliding component 5 more stable, in this embodiment, the ends of the two mounting frames 51 located on the same side of the welding frame are fixedly connected with sleeves 53. The two sleeves 53 have a movable rod 54 slidably inserted into the opposite end, realizing the linkage reinforcement of the two sliding components 5 on the same side, effectively preventing the square frame from shaking.

[0044] Specifically, the two ends of the movable rod 54 are inserted into and slide on opposite ends of the two sleeves 53, and the two rollers 52 on the same side are connected to each other. The stability of the sliding assembly 5 is greatly improved, and the rollers 52 can be pressed tightly against the surface of the steel column 9 to prevent the welding frame from shaking and improve the welding accuracy.

[0045] The movable rod 54, which slides between the two sleeves 53, will move as the welding frame is adjusted, without affecting the adjustment of the welding frame.

[0046] The present invention provides a prefabricated building steel structure welding device. In order to further improve the stability of the sliding component 5, in this embodiment, two sleeves 53 located on the same side of the welding frame are fixedly installed with fixing cylinders 65, and two connecting rods 64 are hinged to the two fixing cylinders 65. One end of the two connecting rods 64 is rotatably installed through a pin, and a permanent magnet 63 is fixedly installed on the side of the pin.

[0047] When the roller 52 comes into contact with the surface of the steel column 9, the permanent magnet 63 will be attracted to the steel column 9, thereby pulling the mounting bracket 51 and pressing the roller 52 tightly onto the steel column 9, completely eliminating gap wobbling.

[0048] When adjusting the welding frame, the two mounting brackets 51 will also move. The mounting brackets 51 will drive the sleeve 53 to move, and the sleeve 53 will drive the fixed cylinder 65 to move. The fixed cylinder 65 adapts to the adjustment of the welding frame by adjusting the angle of the connecting rod 64, thereby avoiding affecting the adjustment of the welding frame.

[0049] The present invention provides a prefabricated steel structure welding device. Since the permanent magnet 63 is attracted to the steel column 9, the friction between the welding frame and the steel column 9 is increased, making it more difficult to move the welding frame. In this embodiment, the stabilizing component 6 also includes a mounting plate 62 fixedly installed on the side of the permanent magnet 63. The mounting plate 62 is made of engineering plastic material, which is insulating and wear-resistant. Multiple freely rotatable balls 61 are embedded on the end face of the mounting plate 62 facing the steel column 9. The balls 61 roll in contact with the surface of the steel column 9, which not only ensures the magnetic attraction is stable, but also greatly reduces the friction when the frame slides, making the relocation operation smoother and less labor-intensive.

[0050] The present invention provides a prefabricated building steel structure welding device to assist in the welding of steel columns 9. In this embodiment, it also includes an auxiliary mechanism 8, which includes a base plate 81. Multiple hydraulic telescopic rods 82 are fixedly installed on the base plate 81. The movable ends of the multiple hydraulic telescopic rods 82 are all fixedly connected to a placement frame 83 that is adapted to the steel column 9.

[0051] Specifically, the width of the placement frame 83 is greater than the width of the welding frame, and there are at least four hydraulic telescopic rods 82.

[0052] In use, the steel column 9 is placed horizontally on the placement frame 83, with both ends of the steel column 9 extending beyond the two outermost placement frames 83. Then, the welding frame is fitted over one end of the steel column 9, and welding of the ear plate 10 can begin. After the ear plate 10 at one end of the steel column 9 is welded, when the welding frame needs to be moved, first control the movable end of the hydraulic telescopic rod 82 closest to the welding frame to shorten, allowing the welding frame to pass through. When the welding frame is between two hydraulic telescopic rods 82, first restore the shortened hydraulic telescopic rod 82 to its original position to support the steel column 9. Then, lower the next hydraulic telescopic rod 82 on the welding frame's movement path. The height is kept low to allow the welding frame to pass through. This process is repeated to move the welding frame to the other end of the steel column 9, and then the ear plate 10 is welded. After one steel column 9 is welded, the position of the steel column 9 can be adjusted by an electric hoist, and then another steel column 9 can be placed on the placement frame 83, ensuring that the ends of the two steel columns 9 are accurately aligned. Then the welding frame can be moved to the other steel column 9. Next, the welded steel column 9 can be lifted away from the auxiliary mechanism 8, and the unwelded steel column 9 can be lifted onto the placement frame 83. By repeating the above operations, all the steel columns 9 in a building can be welded.

[0053] Workflow:

[0054] S1. Equipment pretreatment and steel column placement: The steel column 9 to be welded is horizontally hoisted and placed inside the placement frame 83 of the auxiliary mechanism 8. Stable support is achieved through multiple sets of hydraulic telescopic rods 82 to ensure the horizontal posture of the steel column 9. Both ends of the steel column 9 extend out of the placement frame 83 to reserve space for ear plate welding operation.

[0055] S2. Pre-adjustment of the square frame size: Simultaneously turn the first adjusting screws 1 on both sides of the square frame to drive the inner rod 3 to slide outward from the telescopic groove 7, thereby increasing the length and width of the rectangular square frame so that the inner diameter of the square frame is greater than the outer diameter of the steel column 9, making it easier to fit the entire square frame onto the outer side of the end of the steel column 9.

[0056] S3. Square frame positioning and installation: Insert the enlarged square frame into the end of the steel column 9, turn the first adjusting screw 1 in the opposite direction to drive the inner rod 3 to retract, gradually reducing the size of the square frame, so that the rollers 52 of each sliding component 5 are tightly abutted against the four sides of the steel column 9, and at the same time the permanent magnet 63 magnetically attracts and adheres to the surface of the steel column 9, completing the circumferential positioning and installation of the square frame, ensuring that the square frame does not shake or shift.

[0057] S4. Ear Plate Clamping and Precise Alignment: Place the ear plates 10 to be welded one by one between the two clamping plates 41 of each adjustable clamping mechanism 4. Manually rotate the double-headed screw 46 to drive the clamping plates 41 on both sides to clamp each other and fix the ear plates 10. Rotate the drive nut of the adjusting sleeve 45 with a wrench to drive the two second adjusting screws 43 on the same side to rotate simultaneously, drive the slider 47 to slide, and finely adjust the position of the ear plates 10 so that the ear plates 10 are completely aligned with the welding reference at the end of the steel column 9 to ensure symmetry and welding accuracy.

[0058] S5. Single-sided spot welding fixation: After alignment, spot welding is performed on all clamped and positioned ear plates 10 and steel columns 9 to achieve initial fixation of the ear plates and avoid displacement during subsequent movement.

[0059] S6. Square Frame Sliding and Repositioning: After spot welding, rotate the double-ended screw 46 in the opposite direction to loosen the clamping state of the clamping plate 41 and the ear plate 10, keeping the position of the adjustable clamping mechanism 4 unchanged. According to the square frame's movement path, control the hydraulic telescopic rods 82 at the corresponding positions to retract and avoid obstacles, allowing the square frame to slide smoothly along the side wall of the steel column 9 via the rollers 52, moving the entire square frame to the other end of the steel column 9, and then restoring the hydraulic telescopic rods 82 to their supporting state.

[0060] S7. Continuous welding at both ends: Repeat steps S4-S5 to complete the clamping, alignment and spot welding of the ear plate at the other end of the steel column 9. After all ear plates are spot welded, move the square frame out of the steel column 9 as a whole and perform full welding on all ear plates to complete the ear plate welding process of a single steel column 9.

[0061] S8. Batch Cyclic Operation: After the welding of a single steel column is completed, the finished steel column is lifted away from the auxiliary mechanism 8 by hoisting equipment, and the new steel column to be processed is placed on the placement frame 83. All the above steps are repeated to realize the batch standardized welding operation of multiple steel columns.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A prefabricated steel structure welding device, comprising four L-shaped corner frames, characterized in that, Four L-shaped corner brackets are spliced ​​end to end to form a rectangular welded frame; one end of each L-shaped corner bracket is fixedly connected to an inner rod, and the other end is provided with a telescopic groove, and the inner rods of adjacent L-shaped corner brackets are slidably inserted into the telescopic groove; each L-shaped corner bracket is rotatably mounted with a first adjusting screw on its side, and one end of the first adjusting screw extends into the telescopic groove and is threadedly connected to the inner rod. Each of the L-shaped corner brackets is symmetrically equipped with two sets of adjustable clamping mechanisms at its bottom. The two sets of adjustable clamping mechanisms are located on both sides of the square frame and are used to clamp and position the steel column lugs. Each L-shaped corner frame is also equipped with two sets of sliding components at its bottom. The two sets of sliding components are located on both sides of the square frame to assist the square frame in sliding and shifting along the side wall of the steel column.

2. The prefabricated building steel structure welding device according to claim 1, characterized in that, The adjustable clamping mechanism includes a slide rail fixed to the bottom of the L-shaped bracket, a slider slidably mounted on the bottom of the slide rail, two sets of clamping plates slidably mounted on the slider, a double-ended screw rotatably mounted on the slider, and the two sets of clamping plates threadedly connected to the two ends of the double-ended screw respectively; a second adjusting screw rotatably mounted on the end of the slide rail, and the second adjusting screw threadedly connected to the slider.

3. The prefabricated building steel structure welding device according to claim 2, characterized in that, Two second adjusting screws on the same side of the square frame are fixedly connected to square rods at their ends. The same adjusting sleeve rod is slidably sleeved between the two square rods, and the threads of the two second adjusting screws on the same side of the square frame are opposite. A drive nut is fitted on the outside of the adjusting sleeve rod.

4. The prefabricated building steel structure welding device according to claim 1, characterized in that, The sliding assembly includes a mounting bracket fixed to the bottom of the L-shaped corner frame. Several rollers are rotatably mounted on the inner side of the mounting bracket, and the rollers roll against the side wall of the steel column. Sleeves are fixed to the ends of the two mounting brackets on the same side of the square frame, and a movable rod is slidably inserted between the two sleeves.

5. The prefabricated building steel structure welding device according to claim 4, characterized in that, It also includes a stabilizing component, which includes a fixed cylinder fixed to the outside of the sleeve, a connecting rod hinged to the fixed cylinder, the ends of two adjacent connecting rods being hinged by a pin, and a permanent magnet being fixedly installed on the outside of the pin.

6. The prefabricated building steel structure welding device according to claim 5, characterized in that, The permanent magnet is fixedly mounted with a non-metallic mounting plate on the side facing the steel column. The surface of the mounting plate is embedded with several balls, which roll in contact with the side wall of the steel column.

7. The prefabricated building steel structure welding device according to claim 1, characterized in that, It also includes an auxiliary mechanism, which includes a base plate on which at least four sets of hydraulic telescopic rods are fixedly installed. The telescopic ends of the hydraulic telescopic rods are fixedly connected to a placement frame adapted to the steel column, and the width of the placement frame is greater than the width of the rectangular frame.

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