Steel structure welding preheating equipment

Abstract

The invention discloses steel structure welding preheating equipment, and relates to the field of steel structure welding, and the technical scheme is that the steel structure welding preheating equipment comprises a rack, the rack is provided with a clamping mechanism used for being fixed to a steel structure and a heating mechanism used for preheating the steel structure, and the clamping mechanism and the heating mechanism are in linkage through a transmission mechanism; the heating mechanism comprises a rotating shaft rotationally arranged on the rack, the two ends of the rotating shaft are each fixedly provided with an adapter frame, and each adapter frame is provided with an electric heating pipe. The device has the beneficial effects that mechanical clamping and fixing are achieved, manual holding is not needed, the labor intensity is reduced, and the efficiency is improved; the electric heating pipe is uniform in heating, the temperature is easy to control accurately, flame radiation is avoided, and the safety risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of steel structure welding, and in particular to a steel structure welding preheating device. Background Technology

[0002] Steel structures are structures made of steel materials and are widely used in large factories, stadiums, and high-rise buildings. During the construction process, the assembled steel structure is welded to improve its strength. In order to improve the quality of the welding and avoid defects such as welding cracks, the steel material needs to be preheated locally. Preheating reduces the welding stress and the constraint of the welded structure, as well as slows down the cooling rate after welding, thereby reducing the incidence of defects such as cracks and improving the quality of the welding.

[0003] Currently, the commonly used preheating method is to manually preheat the steel structure locally using a handheld flamethrower through heat conduction or radiation. However, this method has obvious drawbacks: the heating uniformity is extremely poor, which can easily lead to local overheating or insufficient preheating, and the temperature is difficult to control precisely; the flame radiation range is wide, which can easily burn operators or ignite surrounding debris, resulting in high safety risks; manual handheld operation is labor-intensive, inefficient, and wastes a lot of energy. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a steel structure welding preheating device.

[0005] The technical solution includes a frame, on which a clamping mechanism for fixing to a steel structure and a heating mechanism for preheating the steel structure are provided, wherein the clamping mechanism and the heating mechanism are linked by a transmission mechanism. The heating mechanism includes a rotating shaft rotatably mounted on the frame, with a connecting frame fixedly mounted at each end of the rotating shaft, and an electric heating tube mounted on each connecting frame.

[0006] Preferably, the clamping mechanism includes drive rods slidably disposed at the four corners of the frame, and a clamping pressure plate is rotatably disposed at one end of each drive rod, and a pressure block is fixedly disposed on the clamping pressure plate; Two mounting brackets are fixedly installed on the side of the frame away from the clamping pressure plate. Each mounting bracket has a fan-shaped control plate rotatably installed at both ends. The two control plates are symmetrically arranged, and each control plate has an arc-shaped guide groove near the outer wall. A slot is opened at the end of the drive rod away from the clamping pressure plate, the control plate is in the slot, and a fixing rod is fixedly installed at the open end of the slot, and the fixing rod slides in the guide groove; The two side walls of the slot are respectively provided with through slots, and the rotation axis of the control plate slides in the through slots.

[0007] Preferably, a limiting seat is fixedly provided on the side of the frame away from the mounting frame, and two L-shaped clamping plates are provided on the limiting seat, and the clamping pressure plate slides between the two clamping plates; A torsion spring is provided between the clamping pressure plate and the drive rod.

[0008] Preferably, two transmission rods are rotatably arranged in the middle of the mounting frame, and a connecting gear is fixedly arranged on each transmission rod, with the two connecting gears meshing with each other; Each of the transmission rods is fixedly provided with a swing arm, and the movable end of the swing arm is rotatably provided with a connecting rod, which is rotatably connected to the control board.

[0009] Preferably, the transmission mechanism includes a base fixedly disposed in the middle of the frame, a driving bevel gear rotatably disposed on the base, two driven bevel gears meshing on the driving bevel gear, and the two driven bevel gears being disposed opposite to each other; Each of the driven bevel gears is rotatably connected to the frame, and a driving gear is coaxially fixed on each of the driven bevel gears; A driven gear is fixedly mounted on one of the drive rods of each mounting bracket, and the driven gear meshes with the adjacent driving gear; The two driven gears are arranged circumferentially around the driving bevel gear.

[0010] Preferably, an input bevel gear is fixedly disposed on one of the driven bevel gears near the rotating shaft, and an output bevel gear is fixedly disposed on the rotating shaft, wherein the input bevel gear and the output bevel gear mesh with each other.

[0011] Preferably, a central shaft is fixedly installed in the middle of the driving bevel gear, and a control handle is rotatably installed at the upper end of the central shaft; The control handle is tightly attached to the upper end of the base.

[0012] Preferably, the upper end of the base is frustum-shaped; A limiting platform is slidably disposed in the middle of the central axis. The limiting platform is frustum-shaped and has a groove on its inner wall. A sliding table is disposed on the outer wall of the central axis. The limiting platform is slidably connected through the sliding table and the groove. A spring is provided at the lower end of the limiting platform, with one end of the spring abutting against the base and the other end abutting against the limiting platform; A through V-shaped groove is provided on the top of the limiting platform; Two protrusions are provided on the lower surface of the control handle, and the protrusions are located in the V-shaped groove.

[0013] The beneficial effects of the technical solution provided by the embodiments of the present invention are: mechanical clamping and fixing eliminates the need for manual hand-held operation, reducing labor intensity and improving efficiency; the electric heating tube provides uniform heating, making it easy to accurately control the temperature, and there is no flame radiation, reducing safety risks. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the usage state of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention. Figure 1 .

[0016] Figure 3 This is a schematic diagram of the overall structure of an embodiment of the present invention. Figure 2 .

[0017] Figure 4 This is a schematic diagram of the clamping mechanism according to an embodiment of the present invention.

[0018] Figure 5 This is a cross-sectional view of the clamping mechanism according to an embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram of the transmission mechanism according to an embodiment of the present invention.

[0020] Figure 7 This is a schematic diagram of the base and limiting platform structure according to an embodiment of the present invention.

[0021] Figure 8 This is a schematic diagram of the heating mechanism according to an embodiment of the present invention.

[0022] The reference numerals in the attached drawings are as follows: 1. Frame; 2. Clamping mechanism; 3. Heating mechanism; 4. Transmission mechanism; 5. Rotating shaft; 6. Adapter frame; 7. Electric heating tube; 8. Drive rod; 9. Clamping pressure plate; 10. Pressure block; 11. Mounting frame; 12. Control board; 13. Guide groove; 14. Groove; 15. Fixing rod; 16. Through groove; 17. Limit seat; 18. Clamping plate; 19. Transmission rod; 20. Linking gear; 21. Swing arm; 22. Connecting rod; 23. Base; 24. Driving bevel gear; 25. Driven bevel gear; 26. Driving gear; 27. Driven gear; 28. Input bevel gear; 29. ​​Output bevel gear; 30. Central shaft; 31. Control handle; 32. Limit platform; 33. Spring; 34. V-groove; 35. Protrusion; 36. Steel structure. Detailed Implementation

[0023] 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. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1 See Figures 1 to 8 The present invention provides a steel structure welding preheating device, including a frame 1, a clamping mechanism 2 for fixing on a steel structure 36, and a heating mechanism 3 for preheating the steel structure 36. The clamping mechanism 2 and the heating mechanism 3 are linked by a transmission mechanism 4. The heating mechanism 3 includes a rotating shaft 5 rotatably mounted on the frame 1, with a connecting frame 6 fixedly mounted at each end of the rotating shaft 5, and an electric heating tube 7 mounted on each connecting frame 6.

[0028] When the equipment is not in operation, the clamping mechanism 2 is in the loose state, and the electric heating tube 7 of the heating mechanism 3 is in the initial position with the rotating shaft 5. The operator moves the frame 1 to one side of the steel structure 36 to be welded. The operator starts the transmission mechanism 4, and the transmission mechanism 4 transmits power to the clamping mechanism 2 to fix the frame 1 firmly on the flange of the steel structure 36. The position of the heating mechanism 3 is adjusted by the transmission mechanism 4 in conjunction with the clamping mechanism 2 to fix the equipment. At the same time, the transmission mechanism 4 transmits power to the heating mechanism 3, so that the two electric heating tubes 7 are precisely aligned with the area to be welded on the steel structure 36. After the electric heating element 7 is aligned with the area to be preheated, the power is turned on, and the electric heating element 7 begins to heat up, uniformly preheating the welding area of ​​the steel structure 36. Once the preheating reaches the preset requirements, the power supply to the electric heating tube 7 is turned off. The operator then reverses the operation via the transmission mechanism 4 to remove the frame 1 from the steel structure 36, thus completing the entire preheating process.

[0029] The clamping mechanism 2 includes drive rods 8 that are slidably disposed at the four corners of the frame 1. Each drive rod 8 has a clamping pressure plate 9 rotatably disposed at one end, and a pressure block 10 is fixedly disposed on the clamping pressure plate 9. Two mounting brackets 11 are fixedly installed on the side of the frame 1 away from the clamping pressure plate 9. Each mounting bracket 11 has a fan-shaped control plate 12 rotatably installed at both ends. The two control plates 12 are symmetrically arranged, and each control plate 12 has an arc-shaped guide groove 13 near the outer wall. A slot 14 is opened at the end of the drive rod 8 away from the clamping pressure plate 9. The control plate 12 is inside the slot 14. A fixing rod 15 is fixedly installed at the open end of the slot 14. The fixing rod 15 slides in the guide groove 13. The two side walls of the slot 14 are respectively provided with through slots 16, and the rotation axis of the control plate 12 slides in the through slots 16.

[0030] Adjust the frame 1 to the side of the steel structure 36 to be preheated, and drive the fan-shaped control plates 12 at both ends of the mounting frame 11 to rotate synchronously through the transmission mechanism 4. When the control plate 12 rotates, its rotation axis slides along the through slots 16 on both sides of the drive rod 8 slot 14, and the guide slot 13 pushes the drive rod 8 to slide towards the flange of the steel structure 36 through the fixing rod 15. The rotation axis of the control plate 12 is offset from the axis of the arc-shaped guide groove 13, forming an eccentric structure. When the control plate 12 rotates, the rotational motion of the control plate 12 can be converted into the linear sliding of the drive rod 8.

[0031] As the drive rod 8 continues to slide, the pressure block 10 at the end of the clamping plate 9 gradually approaches the flange surface; together with the frame 1, it forms a clamping force on the flange, and firmly fixes the equipment on the flange of the steel structure 36.

[0032] A limiting seat 17 is fixedly installed on the side of the frame 1 away from the mounting frame 11. Two L-shaped clamping plates 18 are provided on the limiting seat 17, and the clamping pressure plate 9 slides between the two clamping plates 18. A torsion spring is provided between the clamping pressure plate 9 and the drive rod 8.

[0033] When the equipment is not clamped, under the action of the torsion spring, the clamping plate 9 rotates 90 degrees around the connecting shaft with the drive rod 8. At this time, the clamping plate 9 is in an avoidance posture, and the operator can directly place the frame 1 close to the flange surface of the steel structure 36. When the frame 1 needs to be fixed, the control plate 12 is rotated by the transmission mechanism 4, which in turn pushes the drive rod 8 to slide along the frame 1 towards the flange of the steel structure 36. At this time, the clamping plate 9 moves towards the flange synchronously with the drive rod 8. Under the action of the limit seat 17, the clamping plate 9 rotates exactly 90 degrees under the limiting action of the clamping plate 18, and the pressure block 10 changes from the avoidance posture to the clamping posture that is perpendicular to the surface of the flange of the steel structure 36. When the pressure block 10 clamps the flange of the steel structure 36, the limiting seat 17 can abut against the clamping pressure plate 9. The abutting force of the limiting seat 17 directly offsets the reverse torque that may be generated during the clamping process, preventing the clamping pressure plate 9 from rotating, ensuring that the pressure block 10 is always perpendicularly attached to the flange surface, and preventing the clamping from loosening or failing. When clamped, the L-shaped clamps 18 on both sides will form a wrapping constraint on the clamping pressure plate 9 from both sides: the inner wall of the clamp 18 is closely attached to the two sides of the clamping pressure plate 9, restricting lateral swaying.

[0034] Two transmission rods 19 are rotatably arranged in the middle of the mounting frame 11, and a connecting gear 20 is fixedly arranged on each transmission rod 19. The two connecting gears 20 mesh with each other. Each transmission rod 19 is fixedly provided with a swing arm 21, and the movable end of the swing arm 21 is rotatably provided with a connecting rod 22, which is rotatably connected to the control plate 12.

[0035] When the equipment needs to clamp or release the flange of the steel structure 36, the power is transmitted through the transmission mechanism 4 to one of the transmission rods 19 in the middle of the mounting frame 11, causing it to rotate. Since the connecting gears 20 on the two transmission rods 19 mesh with each other, the other transmission rod 19 will rotate in the opposite direction synchronously under the action of gear meshing, ensuring that the actions of the two transmission rods 19 are symmetrical and synchronous. As the two transmission rods 19 rotate synchronously in opposite directions, the swing arm 21 fixed on the transmission rod 19 will swing around the axis of the transmission rod 19 together with the transmission rod 19. When the swing arm 21 swings, its movable end drives the fan-shaped control plate 12 at both ends of the mounting frame 11 to move through the rotating connecting rod 22. When the control plate 12 rotates under the drive of the connecting rod 22, its guide groove 13 and the fixed rod 15 of the drive rod 8, and the rotating shaft and the through groove 16 of the drive rod 8 form a sliding fit, which converts the rotational motion of the control plate 12 into the linear sliding of the drive rod 8 along the frame 1, and finally drives the clamping pressure plate 9 to complete the clamping or releasing of the flange of the steel structure 36.

[0036] The transmission mechanism 4 includes a base 23 fixedly installed in the middle of the frame 1, a driving bevel gear 24 rotatably installed on the base 23, and two driven bevel gears 25 meshing on the driving bevel gear 24, with the two driven bevel gears 25 arranged opposite to each other; Each driven bevel gear 25 is rotatably connected to the frame 1, and each driven bevel gear 25 is coaxially fixed with a driving gear 26. A driven gear 27 is fixedly installed on one of the transmission rods 19 of each mounting bracket 11, and the driven gear 27 meshes with the adjacent driving gear 26; Two driven gears 27 are arranged circumferentially around the driving bevel gear 24.

[0037] When the clamping mechanism 2 needs to be driven to move, the driving bevel gear 24 is rotated. The driving bevel gear 24 drives the two driven bevel gears 25 to rotate synchronously in opposite directions. Each driven bevel gear 25 has a driving gear 26 fixed coaxially. Therefore, when the driven bevel gear 25 rotates, the driving gear 26 will rotate synchronously with it. The driving gear 26 drives the driven gear 27 and the transmission rod 19 to rotate. The transmission rod 19 is linked to realize the action of the clamping mechanism 2, and finally realizes the clamping or releasing of the clamping pressure plate 9 on the flange of the steel structure 36.

[0038] An input bevel gear 28 is fixedly mounted on a driven bevel gear 25 located near the rotating shaft 5, and an output bevel gear 29 is fixedly mounted on the rotating shaft 5. The input bevel gear 28 and the output bevel gear 29 mesh with each other.

[0039] When the driving bevel gear 24 rotates, it drives the two oppositely arranged driven bevel gears 25 to rotate synchronously in opposite directions. The input bevel gear 28 rotates synchronously with the driven bevel gear 25. The input bevel gear 28 drives the output bevel gear 29 and the rotating shaft 5 to rotate. The rotating shaft 5 will rotate synchronously with the output bevel gear 29.

[0040] When the rotating shaft 5 rotates, the adapter brackets 6 at both ends and the electric heating tubes 7 mounted on the adapter brackets 6 will rotate synchronously with the rotating shaft 5, thereby adjusting the heating position: Once the equipment has finished clamping and fixing, by controlling the active bevel gear 24 to rotate in the forward direction, the rotating shaft 5 can be rotated to a preset angle, so that the electric heating tube 7 is aligned with the area to be welded on the steel structure 36 for preheating; After preheating, control the active bevel gear 24 to rotate in the opposite direction, and the rotating shaft 5 drives the heating tube 7 to rotate in the opposite direction, so that the heating tube 7 is folded to one side of the frame 1 to avoid interfering with subsequent welding operations.

[0041] A central shaft 30 is fixedly installed in the middle of the driving bevel gear 24, and a control handle 31 is rotatably installed at the upper end of the central shaft 30; The control handle 31 is in close contact with the upper end of the base 23.

[0042] When the equipment is not in operation, the user can directly hold the control handle 31 to place the device on the steel structure 36. Then, by rotating the handle 31, the device can be clamped and fixed on the flange of the steel structure 36. At the same time, through the meshing of the input bevel gear 28 and the output bevel gear 29, the heating tube 7 is driven to rotate to the area to be welded to complete the preheating and alignment.

[0043] After preheating is complete, the operator turns the control handle 31 in the opposite direction, the clamping mechanism 2 releases the flange of the steel structure 36, and at the same time the rotating shaft 5 drives the heating tube 7 to rotate in the opposite direction to the side of the frame 1 to avoid interference with the welding operation.

[0044] The upper end of the base 23 is shaped like a frustum; A limiting platform 32 is slidably provided in the middle of the central axis 30. The limiting platform 32 is in the shape of a frustum. A sliding groove is provided on the inner wall of the limiting platform 32. A sliding table is provided on the outer wall of the central axis 30. The limiting platform 32 is slidably connected through the sliding table and the sliding groove. A spring 33 is provided at the lower end of the limiting platform 32. One end of the spring 33 abuts against the base 23, and the other end abuts against the limiting platform 32. A through V-shaped groove 34 is provided on the top of the limiting platform 32; Two protrusions 35 are provided on the lower surface of the control handle 31, and the protrusions 35 are located in the V-groove 34.

[0045] When the equipment is not in operation, the frustum-shaped outer wall of the limiting platform 32 is in close contact with the frustum-shaped inner wall at the upper end of the base 23, forming circumferential friction. At this time, the limiting platform 32 locks the driving bevel gear 24 through the central shaft 30, preventing it from rotating freely and ensuring that the clamping mechanism 2 and the heating mechanism 3 remain in their current state. When the equipment needs to be driven to move, the operator holds the control handle 31 and rotates it. When the control handle 31 is rotated, the protrusion 35 on its lower surface rotates synchronously with the handle 31. The side of the protrusion 35 will press against the inclined side wall of the V-groove 34 of the limiting platform 32. The pressing force of the protrusion 35 will push the limiting platform 32 to slide down along the slide of the central axis 30. When the limiting platform 32 slides downward, the lower end spring 33 is further compressed. At the same time, the frustum-shaped outer wall of the limiting platform 32 separates from the frustum-shaped inner wall of the upper end of the base 23. The circumferential friction between the two disappears, the active bevel gear 24 is unlocked, and can rotate synchronously with the rotation of the control handle 31 through the central shaft 30, thereby driving the subsequent transmission mechanism 4 to achieve clamping and fixing or adjustment of the position of the heating tube 7.

[0046] When the equipment completes the adjustment, the operator releases the control handle 31, and the limit platform 32 returns to the initial low position under the reset force of the lower spring 33. The frustum-shaped outer wall of the limit platform 32 is once again tightly attached to the frustum-shaped inner wall of the upper end of the base 23, and the circumferential friction is generated again. The limiting platform 32 is fixed by friction, and then the driving bevel gear 24 is locked by the central shaft 30, so that it cannot rotate freely, ensuring that the clamping state of the clamping mechanism 2 or the position of the heating mechanism 3 remains stable, and avoiding the equipment movement deviation caused by vibration or external force.

[0047] When the device is not in use, the clamping mechanism 2 is in the loose state, the electric heating tube 7 of the heating mechanism 3 is in the initial position with the rotating shaft 5, the operator moves the frame 1 to the side of the steel structure 36 to be welded, the operator starts the transmission mechanism 4, the transmission mechanism 4 transmits power to the clamping mechanism 2, and the frame 1 is firmly fixed on the flange of the steel structure 36. The position of the heating mechanism 3 is adjusted by the transmission mechanism 4 in conjunction with the clamping mechanism 2 to fix the equipment. At the same time, the transmission mechanism 4 transmits power to the heating mechanism 3, so that the two electric heating tubes 7 are precisely aligned with the area to be welded on the steel structure 36. After the electric heating element 7 is aligned with the area to be preheated, the power is turned on, and the electric heating element 7 begins to heat up, uniformly preheating the welding area of ​​the steel structure 36. Once the preheating reaches the preset requirements, the power supply to the electric heating tube 7 is turned off. The operator then reverses the operation via the transmission mechanism 4 to remove the frame 1 from the steel structure 36, thus completing the entire preheating process.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steel structure welding preheating device, characterized in that, Includes a frame (1), on which a clamping mechanism (2) for fixing to a steel structure (36) is provided, and a heating mechanism (3) for preheating the steel structure (36) is provided. The clamping mechanism (2) and the heating mechanism (3) are linked by a transmission mechanism (4). The heating mechanism (3) includes a rotating shaft (5) rotatably mounted on the frame (1), and a transfer frame (6) is fixedly mounted at each end of the rotating shaft (5), and an electric heating tube (7) is mounted on each transfer frame (6).

2. The steel structure welding preheating equipment according to claim 1, characterized in that, The clamping mechanism (2) includes drive rods (8) that are slidably disposed at the four corners of the frame (1), and a clamping pressure plate (9) is rotatably disposed at one end of each drive rod (8), and a pressure block (10) is fixedly disposed on the clamping pressure plate (9). Two mounting brackets (11) are fixedly installed on the side of the frame (1) away from the clamping pressure plate (9). Each mounting bracket (11) has a fan-shaped control plate (12) rotatably installed at both ends. The two control plates (12) are symmetrically arranged, and each control plate (12) has an arc-shaped guide groove (13) near the outer wall. A slot (14) is opened at one end of the drive rod (8) away from the clamping pressure plate (9), the control plate (12) is in the slot (14), and a fixing rod (15) is fixedly installed at the open end of the slot (14), and the fixing rod (15) slides in the guide groove (13); The two side walls of the slot (14) are respectively provided with through slots (16), and the rotation axis of the control plate (12) slides in the through slots (16).

3. The steel structure welding preheating equipment according to claim 2, characterized in that, A limiting seat (17) is fixedly provided on the side of the frame (1) away from the mounting frame (11). Two L-shaped clamping plates (18) are provided on the limiting seat (17), and the clamping pressure plate (9) slides between the two clamping plates (18). A torsion spring is provided between the clamping pressure plate (9) and the drive rod (8).

4. The steel structure welding preheating equipment according to claim 3, characterized in that, Two transmission rods (19) are rotatably arranged in the middle of the mounting frame (11), and a connecting gear (20) is fixedly arranged on each transmission rod (19), and the two connecting gears (20) mesh with each other; Each of the transmission rods (19) is fixedly provided with a swing arm (21), and the movable end of the swing arm (21) is rotatably provided with a connecting rod (22), which is rotatably connected to the control plate (12).

5. The steel structure welding preheating equipment according to claim 4, characterized in that, The transmission mechanism (4) includes a base (23) fixedly disposed in the middle of the frame (1), a driving bevel gear (24) rotatably disposed on the base (23), two driven bevel gears (25) meshing on the driving bevel gear (24), and the two driven bevel gears (25) being disposed opposite to each other; Each of the driven bevel gears (25) is rotatably connected to the frame (1), and each of the driven bevel gears (25) is coaxially fixed with a driving gear (26). A driven gear (27) is fixedly provided on one of the transmission rods (19) of each of the mounting brackets (11), and the driven gear (27) meshes with the adjacent driving gear (26); The two driven gears (27) are arranged circumferentially around the driving bevel gear (24).

6. The steel structure welding preheating equipment according to claim 5, characterized in that, An input bevel gear (28) is fixedly disposed on a driven bevel gear (25) located near the rotating shaft (5), and an output bevel gear (29) is fixedly disposed on the rotating shaft (5). The input bevel gear (28) and the output bevel gear (29) mesh with each other.

7. The steel structure welding preheating equipment according to claim 6, characterized in that, A central shaft (30) is fixedly installed in the middle of the active bevel gear (24), and a control handle (31) is rotatably installed at the upper end of the central shaft (30). The control handle (31) is in close contact with the upper end of the base (23).

8. The steel structure welding preheating equipment according to claim 7, characterized in that, The upper end of the base (23) is frustum-shaped; A limiting platform (32) is slidably provided in the middle of the central shaft (30). The limiting platform (32) is in the shape of a frustum. A sliding groove is provided on the inner wall of the limiting platform (32). A sliding table is provided on the outer wall of the central shaft (30). The limiting platform (32) is slidably connected through the sliding table and the sliding groove. A spring (33) is provided at the lower end of the limiting platform (32), one end of the spring (33) abuts against the base (23), and the other end abuts against the limiting platform (32); A through V-shaped groove (34) is provided on the top of the limiting platform (32). Two protrusions (35) are provided on the lower surface of the control handle (31), and the protrusions (35) are located in the V-groove (34).

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