Welding mobile operation platform for high and large steel beam

Abstract

The utility model relates to a kind of high and tall steel beam welding mobile operation platform, comprising: main frame, setting in steel beam one side;Clamp plate group, including detachably connected first L-shaped clamp plate and second L-shaped clamp plate, first L-shaped clamp plate includes mutually perpendicular first horizontal clamp plate edge and first vertical clamp plate edge, and first vertical clamp plate edge is fixed on main frame upper end;Second L-shaped clamp plate includes rotationally connected second horizontal clamp plate edge and second vertical clamp plate edge, and adjustable screw rod is connected between second horizontal clamp plate edge and second vertical clamp plate edge, and the included angle α of second L-shaped clamp plate is adjusted by adjustable screw rod;Pulley group, including the first directional pulley of setting in steel beam both sides and the second directional pulley of setting in steel beam top and having self-locking function, and first directional pulley is respectively installed on main frame lower end and second vertical clamp plate edge by first pulley support, and second directional pulley is respectively installed on first horizontal clamp plate edge and second horizontal clamp plate edge by second pulley support.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and specifically relates to a mobile operating platform for welding tall steel beams. Background Technology

[0002] In the construction of steel structure projects, due to the large volume of steel structures, workers can only complete welds below 1.8m by standing upright during ground welding operations. For welds exceeding this height, scaffolding is required. Therefore, operating platforms play a crucial role in steel structure welding. However, traditional steel pipe scaffolding methods have several problems in ground welding of tall steel structures, including: increased transportation and turnover costs due to the complexity of scaffolding materials; low scaffolding erection and dismantling efficiency, requiring movement of the scaffolding at each weld location, affecting construction progress; and insufficient material reuse leading to resource waste. While standardized portal scaffolding available on the market offers modular advantages, its height adjustment range (typically ≤2.4m) is insufficient to meet the full-section welding requirements of large-section steel beams (H≥3m).

[0003] CN212897499U discloses a suspended cage for steel beam welding operations, comprising a cage body, a base plate movably mounted at the bottom of the cage body via connecting rods, with the connecting rods positioned on both sides of the base plate, a straight ladder fixedly mounted at the top of the cage body, a steel plate fixedly mounted at the top of the straight ladder, and a suspension plate fixedly mounted on the lower surface of the steel plate. By configuring the cage body, the straight ladder, and the steel plate, during steel beam welding operations, the suspension plate is hung on the steel beam to be welded, allowing for stable suspension on the pipe frame steel beam, facilitating work by construction personnel via the straight ladder and effectively improving construction efficiency. While this technical solution meets the welding requirements of tall steel structures by suspending the cage on the steel beam, due to the numerous and widespread welding locations, the cage can only be placed in a fixed position at a time. After completing work in one area, it needs to be disassembled and then placed in the next location, wasting time and manpower and affecting construction progress. Furthermore, because the steel plate size is fixed, this suspended cage cannot meet the welding requirements of steel beams of different widths. Utility Model Content

[0004] The purpose of this utility model is to provide an adjustable mobile operating platform for welding tall steel beams, which solves the problem of ground splicing and welding of tall and large steel structures, meets the welding needs of steel beams in different working areas, realizes rapid transfer of multiple working surfaces, and improves construction efficiency; at the same time, by adjusting the width and angle of the clamping plate assembly, it can meet the welding needs of rectangular steel beams and irregular steel beams of different widths.

[0005] The technical solution of this utility model is a mobile operating platform for welding tall steel beams, including:

[0006] The main frame is located on one side of the steel beam;

[0007] The clamping plate assembly includes a first L-shaped clamping plate and a second L-shaped clamping plate that are detachably connected. The first L-shaped clamping plate includes a first horizontal clamping plate side and a first vertical clamping plate side that are perpendicular to each other. The first vertical clamping plate side is fixed to the upper end of the main frame. The second L-shaped clamping plate includes a second horizontal clamping plate side and a second vertical clamping plate side that are rotatably connected. An adjustable screw is connected between the second horizontal clamping plate side and the second vertical clamping plate side, and the included angle α of the second L-shaped clamping plate is adjusted by means of the adjustable screw.

[0008] The pulley block includes a first directional pulley disposed on both sides of the steel beam and a second directional pulley disposed on the top of the steel beam and having a self-locking function. The first directional pulley is respectively installed on the lower end of the main frame and the side of the second vertical clamping plate via a first pulley bracket. The second directional pulley is respectively installed on the side of the first horizontal clamping plate and the side of the second horizontal clamping plate via a second pulley bracket.

[0009] Preferably, the first horizontal clamping plate has a plurality of first threaded holes spaced apart on its side, and the second horizontal clamping plate has a plurality of second threaded holes spaced apart on its side. The distance between the first L-shaped clamping plate and the second L-shaped clamping plate is adjusted by connecting the first threaded holes and the second threaded holes at different positions with bolts.

[0010] Preferably, connecting plates are fixed on opposite sides of the top of the second pulley bracket. The connecting plates have vertical elliptical slots. The vertical elliptical slots are connected and fixed to the first threaded hole or the second bolt hole by bolts, thereby fixing the second directional pulley to the bottom of the first horizontal clamping plate or the second horizontal clamping plate. The bolts can move along the vertical elliptical slots to adjust the height of the second directional pulley.

[0011] Preferably, the second vertical clamping plate is provided with a plurality of third threaded holes spaced apart on its side, and the two ends of the adjustable screw are respectively connected and fixed to the second threaded holes and the third threaded holes by bolts.

[0012] Preferably, the adjustable lead screw consists of two hinged screws and a sleeve connected together, and the included angle α of the second L-shaped clamp is adjusted by rotating the sleeve.

[0013] Preferably, the included angle α is adjustable in the range of 60° to 150°.

[0014] Preferably, the clamping plate assembly is provided in two sets, and the two sets of clamping plate assemblies are symmetrically fixed to the upper end of the main frame to suspend the main frame on the steel beam.

[0015] Preferably, the main frame includes a fixed frame and a telescopic frame fitted below the fixed frame. The telescopic frame can move up and down along the fixed frame and is fixed by bolts to adjust the overall height of the main frame.

[0016] Preferably, the main frame is formed by welding square tubes, and lifting lugs are fixed on opposite sides of the top of the main frame. Wire mesh is welded to both outer facades of the main frame to form vertical protection. The bottom of the main frame adopts Anti-slip patterned steel plates are welded to form a steel plate protective platform, the main body of which The operating platform of the frame is made of anti-slip patterned steel plate welded together to form an easy-to-stand operating platform.

[0017] Preferably, another main frame is fixed to the side of the second vertical clamping plate, and the two main frames are symmetrically suspended on both sides of the steel beam.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (1) The connection of the main frame, clamping plate group and pulley group can form a variety of combination methods to form a movable overall operating platform structure, which can ensure simultaneous welding operations on both sides of the steel beam, and can ensure single-side welding operations of rectangular steel beams or irregular steel beams, thus improving the overall construction efficiency; at the same time, with the pulley group with self-locking function, it can realize rapid transfer of multiple working surfaces, greatly improving the relocation efficiency.

[0020] (2) The three-point limiting is formed by the cooperation of the first directional pulleys on both sides of the steel beam and the second directional pulley on the top of the steel beam to ensure the stability of the pulley block center and prevent the operating platform from tipping over or derailing; since the second directional pulley has a self-locking function, the operating platform is fixed by locking the second directional pulley during welding operations, thereby improving the safety of welding operations.

[0021] (3) By setting an adjustable second L-shaped clamp, and using an adjustable screw to adjust the included angle α of the second L-shaped clamp, the operating platform can simultaneously meet the welding operations of rectangular steel beams and irregular steel beams.

[0022] (4) By setting up detachable first L-shaped clamps and second L-shaped clamps, and adjusting the distance between the first L-shaped clamps and second L-shaped clamps, the welding requirements of tall steel structure beams of different widths can be met.

[0023] (5) By setting a connecting plate with vertical elliptical strip holes on the second pulley bracket, the vertical position of the second directional pulley can be finely adjusted by bolts when there is unevenness at the top of the steel beam, so that the second directional pulley moves to fit the upper surface of the steel beam.

[0024] (6) Since the main frame is composed of a fixed frame and a telescopic frame, the telescopic frame moves up and down along the fixed frame and is fixed by bolts to adjust the overall height of the main frame, thereby meeting the welding requirements of tall steel structures of different heights and breaking through the height limitations of traditional operating platforms. Attached Figure Description

[0025] Figure 1 This is a schematic elevation view of the single-sided welding construction of the rectangular steel beam of this utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the AA section;

[0027] Figure 3 yes Figure 1 Schematic diagram of the BB cross section;

[0028] Figure 4 yes Figure 1 Schematic diagram of the CC section;

[0029] Figure 5 This is a schematic elevation view of the single-sided welding construction of the irregular steel beam of this utility model;

[0030] Figure 6 This is a schematic diagram of the connection between the first L-shaped clamp and the second L-shaped clamp. Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the connection between the first L-shaped clamp and the second L-shaped clamp. Figure 2 ;

[0032] Figure 8 This is a schematic diagram of the connection between the first L-shaped clamp and the second L-shaped clamp. Figure 3 ;

[0033] Figure 9 This is a schematic diagram of the adjustable lead screw in its retracted state;

[0034] Figure 10 This is a schematic diagram of the adjustable lead screw in its tension state;

[0035] Figure 11 This is a schematic diagram of one angle of the second directional pulley;

[0036] Figure 12 This is a schematic diagram of the second directional pulley from another angle;

[0037] Figure 13 This is a schematic diagram of the main frame under tension.

[0038] Figure 14 This is a schematic diagram of the main frame in its contracted state;

[0039] Figure 15This is an elevation view of the double-sided welding construction of the rectangular steel beam of this utility model.

[0040] Explanation of key component symbols:

[0041] Main frame 1; Fixed frame 11; Telescopic frame 12; Lifting lug 13; Wire mesh 14; Steel plate protective platform 15;

[0042] Clamping plate assembly 2; First L-shaped clamping plate 21; First horizontal clamping plate edge 211; First threaded hole 2111; First vertical clamping plate edge 212; Second L-shaped clamping plate 22; Second horizontal clamping plate edge 221; Second threaded hole 2211; Second vertical clamping plate edge 222; Third threaded hole 2221; Adjustable lead screw 223; Screw 2231; Sleeve 2232;

[0043] Pulley block 3; First directional pulley 31; Second directional pulley 32; First pulley bracket 33; Second pulley bracket 34; Connecting plate 35; Strip hole 351; Bolt 36;

[0044] Steel beam 4. Detailed Implementation

[0045] This utility model will be further described in detail below with reference to the accompanying drawings:

[0046] Please see Figure 1 , Figure 5 , Figure 8As shown, this utility model provides a mobile operating platform for welding tall steel beams, including: a main frame 1, a clamping plate assembly 2, and a pulley assembly 3. The main frame 1 is hung on one side of a steel beam 4 via the clamping plate assembly 2 fixedly connected to its upper end to realize unilateral welding operations on the steel beam. The clamping plate assembly 2 includes a first L-shaped clamping plate 21 and a second L-shaped clamping plate 22 that are detachably connected. The first L-shaped clamping plate 21 includes a first horizontal clamping plate side 211 and a first vertical clamping plate side 212 that are perpendicular to each other. The first vertical clamping plate side 212 is fixed to the upper end of the main frame 1. The second L-shaped clamping plate 22 includes a second horizontal clamping plate side 221 and a second vertical clamping plate side 222 that are rotatably connected. An adjustable screw rod 223 is connected between the second horizontal clamping plate side 221 and the second vertical clamping plate side 222. The included angle α of the second L-shaped clamping plate 22 is adjusted by the adjustable screw rod 223, so that the operating platform can simultaneously meet the requirements of rectangular steel beam welding. The system is used for single-sided welding of beams and irregular steel beams. The pulley block 3 includes a first directional pulley 31 set on both sides of the steel beam 4 and a second directional pulley 32 set on the top of the steel beam 4 with a self-locking function. The first directional pulley 31 is installed on the lower end of the main frame 1 and the second vertical clamping plate edge 222 respectively through the first pulley bracket 33. The second directional pulley 32 is installed on the first horizontal clamping plate edge 211 and the second horizontal clamping plate edge 221 respectively through the second pulley bracket 34. The cooperation of the first directional pulley 31 on both sides of the steel beam and the second directional pulley 32 on the top of the steel beam forms a three-point limit, ensuring the stability of the pulley block center and preventing the operating platform from tipping over or derailing. Since the second directional pulley 32 has a self-locking function, which can be achieved using existing technology, the operating platform is fixed by locking the second directional pulley 32 during welding operations, thereby improving the safety of welding operations.

[0047] In this embodiment, as Figure 2 , Figure 4 As shown, the clamping plate group 2 has two sets, which are symmetrically fixed on the upper end of the main frame 1 to suspend the main frame 1 on the steel beam 4. At the same time, it works with the pulley group 3 with self-locking function to achieve rapid transfer of multiple working surfaces and greatly improve the relocation efficiency. Compared with the traditional process, this operating platform can reduce the cost of auxiliary measures, has a high material turnover rate, and effectively solves the problem of operating platform setting when welding tall steel structure beams on the ground.

[0048] Please see Figures 6 to 8As shown, a plurality of first threaded holes 2111 are spaced apart on the first horizontal clamping plate edge 211, and a plurality of second threaded holes 2211 are spaced apart on the second horizontal clamping plate edge 221. The spacing between the first L-shaped clamping plate 21 and the second L-shaped clamping plate 22 is adjusted by bolting the first threaded holes 2111 and the second threaded holes 2211 at different positions to meet the welding requirements of tall steel structure beams of different widths. In this embodiment, by adjusting the spacing between the first L-shaped clamping plate 21 and the second L-shaped clamping plate 22, welding operations on steel beams with a width range of 300-1500mm can be achieved.

[0049] Please see Figure 11 , Figure 12 As shown, connecting plates 35 are fixed on opposite sides of the top of the second pulley bracket 34. Vertical elliptical slots 351 are provided on the connecting plates 35. The vertical elliptical slots 351 are connected and fixed to the first threaded hole 2111 or the second threaded hole 2211 by bolts 36, thereby fixing the second directional pulley 32 to the bottom of the first horizontal clamping plate side 211 or the second horizontal clamping plate side 221. The bolts 36 can move along the vertical elliptical slots 351 to adjust the height of the second directional pulley 32. Thus, when there is unevenness at the top of the steel beam, the vertical position of the second directional pulley 32 can be finely adjusted to make the second directional pulley 32 move to fit the upper surface of the steel beam 4.

[0050] Please see Figures 6 to 8 As shown, the second vertical clamping plate edge 222 is provided with multiple third threaded holes 2221 spaced apart. The two ends of the adjustable screw 223 are respectively connected and fixed to the second threaded holes 2211 and the third threaded holes 2221 by bolts. Specifically, as shown... Figure 9 , Figure 10 As shown, the adjustable lead screw 223 is composed of two long hinged screws 2231 and a long sleeve 2232 connected together; as Figure 8 As shown, the included angle α of the second L-shaped clamping plate 22 is adjusted by rotating the sleeve 2232. The adjustment range of the included angle α is 60° to 150°. The included angle α of the second L-shaped clamping plate 22 is adjusted according to different angles of the steel beam, thus enabling the operating platform to be simultaneously adapted to various applications. Figure 1 The rectangular steel beam shown and as Figure 5 The welding operation of the irregularly shaped steel beam shown.

[0051] In some embodiments, please refer to Figure 13 , Figure 14As shown, the main frame 1 includes a fixed frame 11 and a telescopic frame 12 sleeved below the fixed frame 11. The telescopic frame 12 can move up and down along the fixed frame 11 and is fixed by bolts to adjust the overall height of the main frame 1. In this embodiment, the height of the main frame 1 is adjustable from 3 to 5 meters, and the operating platform can cover a working surface with a height of 0.5 to 5.2 meters, fully meeting the welding needs of tall steel structures of different heights and breaking through the height limitations of traditional operating platforms.

[0052] Please see Figure 1 , Figure 2 As shown, the main frame 1 is formed by welding square tubes. Lifting lugs 13 are fixed to opposite sides of the top of the main frame 1 to facilitate the lifting of the assembled operating platform frame to the welding position of the steel structure beams by a tower crane or crane. Steel wire mesh 14 is welded to both exterior facades of the main frame 1 to form vertical protection and improve operational safety. Please refer to [link / reference]. Figure 3 As shown, the bottom of the main frame 1 is formed by welding anti-slip patterned steel plates to form a steel plate protective platform 15, and the operating layer of the main frame 1 is formed by welding anti-slip patterned steel plates to form an operating platform that is easy to stand on, so as to improve the safety of operation.

[0053] In some embodiments, such as Figure 15 As shown, another main frame 1 is fixed to the second vertical clamping plate edge 222. The two main frames 1 are symmetrically hung on both sides of the steel beam 4 through two sets of clamping plate groups 2 fixedly connected at the upper end, so as to realize simultaneous welding operations on both sides of the steel beam 4. By rotating the second vertical clamping plate edge 222, the main frame 1 is moved, so that the operating platform can simultaneously meet the double-sided welding requirements of rectangular steel beams and irregular steel beams. In this embodiment, the lower ends of the main frames 1 located on both sides of the steel beam are symmetrically equipped with first directional pulleys 31. The cooperation of the first directional pulleys 31 on both sides of the steel beam and the second directional pulleys 32 on the top of the steel beam forms a three-point limit, ensuring the stability of the pulley group center.

[0054] The manufacturing and usage process of the high steel beam welding mobile operation platform provided by this utility model is as follows:

[0055] I. Component fabrication.

[0056] Fabrication of main frame 1: The main frame 1 is designed to be 3-5m high according to the welding requirements of large steel structures. The main frame 1 is made of 50 square tube and is cut according to the required dimensions of the operating platform.

[0057] Fabrication of clamping plate assembly 2: The first L-shaped clamping plate 21 is formed by welding two rectangular steel plates to create a 90° right-angle clamping plate. According to the design drawings, multiple clamping plates are cut on the first horizontal clamping plate edge 211. Bolt holes; the second L-shaped clamping plate 22 is a section connected by two rectangular steel plates with bolts, and multiple bolt holes are respectively opened on the second horizontal clamping plate side 221 and the second vertical clamping plate side 222. The bolt holes are then connected to the second horizontal clamping plate edge 221 and the second vertical clamping plate edge 222 by an adjustable screw 223, forming an included angle α between 60° and 150°. The adjustable screw 223 is connected by two 120mm long hinged screws 2231 and a 100mm long sleeve 2232.

[0058] Machining of pulley block 3: The first directional pulley 31 is a traditional directional pulley. The first directional pulley 31 is installed on the main frame 1 and the second vertical clamping plate edge 222 respectively through the first pulley bracket 33; the second directional pulley 32 is a directional pulley with brake. The second directional pulley 32 is installed on the second pulley bracket 34. Two 3mm thick steel plates are machined on the second pulley bracket 34 as connecting plates 35. Vertical elliptical strip holes 351 are opened on the connecting plates 35. The second pulley bracket 34 is installed on the bottom of the first horizontal clamping plate edge 211 and the second horizontal clamping plate edge 221 respectively through the connecting plates 35 and locked and fixed by bolts 36.

[0059] II. Installation and use of the operating platform.

[0060] The installation steps for a mobile operating platform for high steel beams used for single-sided welding include:

[0061] The individual processed components are assembled into the main frame 1 by welding. After assembling one main frame 1, the first L-shaped clamping plate 21 is welded or bolted to the top of the main frame 1. The relative positions of the first and second L-shaped clamping plates are adjusted according to the width of the steel beam, and then fixed with 20*80 bolts. The angle α of the second L-shaped clamping plate 22 is adjusted according to the shape of the steel beam and fixed using an adjustable screw rod 223. First directional pulleys 31 are installed on the lower side wall of the main frame 1 and the vertical side wall of the second L-shaped clamping plate 22, respectively. Second directional pulleys 32 are installed at the bottom of the first and second L-shaped clamping plates 21 and 22, respectively. Finally, the assembled operating platform frame is lifted by a tower crane or crane to one side of the steel structure beam welding construction position. The bottom of the main frame 1 is about several tens of centimeters above the ground. Steel wire mesh is welded to the main frame on the exterior facade of the frame as vertical protection. Patterned steel plates are welded to the bottom of the frame and the operating level as horizontal protection and a platform for personnel. After the installation of the high steel beam welding mobile operation platform is completed, the second directional pulley is locked. Construction workers enter the main frame to carry out welding operations. After welding is completed, the construction workers unlock the second directional pulley and push the platform by supporting the steel beam with their hands or by standing on the ground to push the platform along the steel beam to the next working surface. After reaching the designated position and locking the second directional pulley, welding operations are carried out.

[0062] The installation steps for the mobile operating platform for tall steel beams used for double-sided welding include:

[0063] The processed individual components are assembled into a main frame 1 by welding. Two main frames 1 are assembled. The top of one main frame 1 is connected to a first L-shaped clamp plate by welding or bolting, and the top of the other main frame 1 is connected to a second L-shaped clamp plate by welding or bolting. After adjusting the relative positions of the first and second L-shaped clamp plates according to the width of the steel beam, they are fixed by connecting them with 20*80 bolts. The angle α of the second L-shaped clamp plate 22 is adjusted according to the shape of the steel beam and fixed by adjusting the screw rod 223. The first directional pulley 31 is installed on the lower side wall of the main frame 1 and the vertical side wall of the second L-shaped clamp plate 22, respectively. The second directional pulley 32 is installed at the bottom of the first L-shaped clamp plate 21 and the second L-shaped clamp plate 22, respectively. Finally, the assembled operating platform frame is lifted to the steel structure steel beam welding construction position by tower crane or crane. The bottom of the main frame 1 is about several tens of centimeters above the ground. Steel wire mesh was welded to the main frame on the exterior facade of the scaffolding for vertical protection, while patterned steel plates were welded to the bottom of the scaffolding and the operating level to provide horizontal protection and a platform for personnel. After the installation of the mobile operating platform for welding the tall steel beams was completed, the second directional pulley was locked, and construction workers entered the main frame on both sides of the steel beams to carry out welding operations simultaneously.

[0064] The high-rise steel beam mobile operation platform provided by this utility model can be combined in various ways through the connection of the main frame, clamping plate group and pulley group, so as to realize the welding operation of rectangular steel beams and irregular steel beams on one side or both sides, thereby improving the overall construction efficiency. With the pulley group with self-locking function, it forms a mobile overall operation platform structure, which can realize the rapid transfer of multiple work surfaces and greatly improve the relocation efficiency. The operation platform adopts standardized components, which can be installed quickly and is easy for workers to operate. Compared with traditional processes, it can reduce the cost of auxiliary measures, can be reused multiple times, save labor and material costs, and has a high material turnover rate, thereby reducing project costs.

[0065] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the claims of the present utility model should be covered by the claims of the present utility model.

Claims

1. A mobile operating platform for welding tall steel beams, characterized in that, include: The main frame is located on one side of the steel beam; The clamping plate assembly includes a first L-shaped clamping plate and a second L-shaped clamping plate that are detachably connected. The first L-shaped clamping plate includes a first horizontal clamping plate side and a first vertical clamping plate side that are perpendicular to each other. The first vertical clamping plate side is fixed to the upper end of the main frame. The second L-shaped clamping plate includes a second horizontal clamping plate side and a second vertical clamping plate side that are rotatably connected. An adjustable screw is connected between the second horizontal clamping plate side and the second vertical clamping plate side, and the included angle α of the second L-shaped clamping plate is adjusted by means of the adjustable screw. The pulley block includes a first directional pulley disposed on both sides of the steel beam and a second directional pulley disposed on the top of the steel beam and having a self-locking function. The first directional pulley is respectively installed on the lower end of the main frame and the side of the second vertical clamping plate via a first pulley bracket. The second directional pulley is respectively installed on the side of the first horizontal clamping plate and the side of the second horizontal clamping plate via a second pulley bracket.

2. The mobile operating platform for welding tall steel beams according to claim 1, characterized in that, The first horizontal clamping plate has a plurality of first threaded holes spaced apart on its side, and the second horizontal clamping plate has a plurality of second threaded holes spaced apart on its side. The distance between the first L-shaped clamping plate and the second L-shaped clamping plate is adjusted by connecting the first threaded holes and the second threaded holes at different positions with bolts.

3. The high-rise steel beam welding mobile operation platform according to claim 2, characterized in that, The second pulley bracket has connecting plates fixed on opposite sides of its top. The connecting plates have vertical elliptical slots. The vertical elliptical slots are connected and fixed to the first threaded hole or the second bolt hole by bolts, thereby fixing the second directional pulley to the bottom of the first horizontal clamping plate or the second horizontal clamping plate. The bolts can move along the vertical elliptical slots to adjust the height of the second directional pulley.

4. The high-rise steel beam welding mobile operation platform according to claim 2, characterized in that, The second vertical clamping plate has multiple third threaded holes spaced apart on its side. The two ends of the adjustable screw are respectively connected and fixed to the second threaded holes and the third threaded holes by bolts.

5. The mobile operating platform for welding tall steel beams according to claim 4, characterized in that, The adjustable lead screw consists of two hinged screws and a sleeve connected together. The included angle α of the second L-shaped clamp is adjusted by rotating the sleeve.

6. The mobile operating platform for welding tall steel beams according to claim 5, characterized in that, The adjustment range of the included angle α is 60° to 150°.

7. The mobile operating platform for welding tall steel beams according to claim 1, characterized in that, The clamping plate assembly consists of two sets, which are symmetrically fixed to the upper end of the main frame to suspend the main frame on the steel beam.

8. The mobile operating platform for welding tall steel beams according to claim 1, characterized in that, The main frame includes a fixed frame and a telescopic frame fitted below the fixed frame. The telescopic frame can move up and down along the fixed frame and is fixed by bolts to adjust the overall height of the main frame.

9. The mobile operating platform for welding tall steel beams according to claim 1, characterized in that, The main frame is formed by welding square tubes. Lifting lugs are fixed on the top of the main frame on both sides. Wire mesh is welded to both sides of the main frame to form vertical protection. The bottom of the main frame is formed by welding anti-slip patterned steel plates to form a steel plate protective platform. The operating layer of the main frame is formed by welding anti-slip patterned steel plates to form an operating platform that is easy to stand on.

10. The high-rise steel beam welding mobile operation platform according to any one of claims 1-9, characterized in that, The second vertical clamp is fixed to another main frame, and the two main frames are symmetrically suspended on both sides of the steel beam.

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