Welding device for steel fireproof door

Abstract

The invention discloses a welding device for a steel fireproof door, and relates to the technical field of fireproof door welding, the welding device comprises a base, a moving column is slidably mounted at the end of the base, a removing assembly is slidably mounted at the end of the moving column, and the welding position of a protective door is preliminarily cleaned through the removing assembly; according to the welding device for the steel fireproof door, workpieces are adjusted through the adjusting assembly, accurate workpiece positioning and butt joint can be achieved, and the accuracy of the welding position is ensured; welding defects caused by inaccurate butt joint of workpieces are reduced through high-precision adjustment, so that the welding quality and the production efficiency are improved, vibration generated during welding is buffered in cooperation with an elastic piece, and the welding precision is improved.

Description

Technical Field

[0001] The invention relates to a fire door welding technology, in particular to a welding device for a steel fire door. Background Art

[0002] Steel fire doors are an important safety device specially designed to prevent the spread of flames and smoke in the event of a fire. They are usually made of high-quality steel with good fire resistance. They can maintain structural integrity and thermal insulation for a certain period of time, buying valuable time for personnel evacuation and fire rescue. When processing steel fire doors, different metal parts need to be firmly connected together through welding to form an integral structure. Good welding technology helps to improve the sealing of the door body and reduce the penetration of heat, smoke and toxic gases, thereby buying more time for personnel evacuation.

[0003] The Chinese invention patent with publication number CN118002989B discloses a steel fire door body welding fume treatment device. The steel fire door body welding fume treatment device can be symmetrically arranged on both sides of the welding gun head through the filter unit. When the welding gun head generates a large amount of smoke during the welding process, the filter unit can quickly inhale the smoke, with good absorption effect and rapid absorption, preventing the smoke from overflowing. The smoke filtered by the filter unit is purified by the purification unit and then discharged, avoiding the safety impact of manual inhalation of welding smoke. At the same time, when the welding smoke enters the negative pressure chamber, the filter plate will filter the large particles of impurities in the smoke, and the large particles of impurities will accumulate on the outer surface of the filter plate. The electric push rod works periodically. When the electric push rod works, the electric push rod drives the filter plate to reciprocate, so that the outer side of the filter plate can rub against the baffle rod. The baffle rod can scrape and remove the outer side of the filter plate to prevent impurities from accumulating and affecting the filtration efficiency of the filter plate.

[0004] When using existing equipment, due to the unevenness or rough surface of the welding platform, the various components of the fire door may not be accurately docked, resulting in differences in the docking ends of the workpieces, and then errors in the docking ends when the workpieces are welded. At the same time, welding slag and spatter are often generated during the welding process. These residues not only affect the appearance of the welded joint, but may also affect the performance of the joint. In addition, the metal surface will be exposed to a high temperature environment, which is prone to oxidation reactions, which can easily affect the long-term durability of the plate. Summary of the Invention

[0005] The object of the present invention is to provide a welding device for a steel fire door to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a welding device for a steel fire door, comprising a base, a movable column slidably mounted on an end portion of the base, and a cleaning assembly slidably mounted on an end portion of the movable column, wherein the cleaning assembly is used to perform preliminary cleaning of the welding position of the protective door; An adjustment assembly, which is assembled at the end of the base, and is used to protect the fire door in its docking and processing state; The adjustment assembly includes a base fixedly connected to the base, positioning blocks are symmetrically fixedly installed at the ends of the base, and a driving member is fixedly installed between the two positioning blocks; A first swing block is rotatably mounted on one side of the end of the positioning block, and a second swing block is rotatably mounted on the end of the positioning block away from the first swing block; An elastic member is rotatably mounted on the end of the second swing block, and the end of the elastic member is rotatably connected to the end of the base; The output end of the driving member is fixedly mounted with a driving rod, an adjusting block is rotatably mounted on the end of the driving rod, a rotating block is rotatably mounted on the end of the adjusting block, the end of the rotating block is fixedly connected to the end of the driving rod, a supporting plate is fixedly mounted on the end of the rotating block, and a limiting rod is rotatably mounted on one side of the adjusting block; The ends of the adjusting block are symmetrically provided with docking holes, and the inner walls of the two docking holes are rotatably connected to the ends of the first swing block and the second swing block respectively.

[0007] As a further optimized solution of the present invention, a fixing block is fixedly installed on the end of the base, and a support plate is fixedly installed on the end of the fixing block.

[0008] As a further optimization solution of the present invention, a movable rod is slidably mounted on one side of the fixed block, a movable block is fixedly mounted on the end of the movable rod, and a locking block is fixedly mounted on the end of the movable block.

[0009] As a further optimization scheme of the present invention, the cleaning component includes a fixed plate slidably connected to the movable column, a sliding groove is provided at the end of the fixed plate, a movable block is slidably installed on the inner wall of the sliding groove, and a gear rod is fixedly installed at the end of the movable block.

[0010] As a further optimization scheme of the present invention, a turntable is rotatably installed at the end of the fixed plate, and a protrusion is fixedly installed at the end of the turntable near the edge. At the same time, a drive plate is slidably installed on the outer surface of the protrusion, and one side of the drive plate is rotatably connected to the end of the fixed plate, and the end of the drive plate is engaged with the outer surface of the gear rod.

[0011] As a further optimization solution of the present invention, a guide groove is provided at the end of the fixing plate, a leveling scraper is slidably mounted on the inner wall of the guide groove, and the end of the leveling scraper is engaged with the outer surface of the gear rod.

[0012] As a further optimization solution of the present invention, a limiting plate is fixedly installed on one side of the fixed plate, the cross section of the limiting plate is concave, and a rotating shaft is rotatably installed on the inner wall of the limiting plate.

[0013] As a further optimized solution of the present invention, a power plate is fixedly mounted on the outer surface of the rotating shaft, and a power rod is rotatably mounted on the end of the power plate.

[0014] As a further optimization solution of the present invention, a connecting block is fixedly mounted on the outer surface of the rotating shaft, a circular ring is rotatably mounted on the outer surface of the connecting block, and an annular groove is formed on the outer surface of the circular ring.

[0015] As a further optimization solution of the present invention, a docking block is fixedly installed at the end of the moving block, and the outer surface of the docking block is engaged with the inner wall of the annular groove.

[0016] Compared with the prior art, the welding device for a steel fire door provided by the present invention has the following beneficial effects: by adjusting the workpiece by adjusting the components, precise workpiece positioning and docking can be achieved, ensuring the accuracy of the welding position; high-precision adjustment reduces welding defects caused by inaccurate workpiece docking, thereby improving welding quality and production efficiency, and cooperates with elastic parts to buffer the vibration generated during welding, thereby improving the accuracy of welding.

[0017] At the same time, with the help of the support plate, the locking block can accurately limit the initial position of the workpiece, making the workpiece more stable during the welding process, thereby reducing poor welding caused by improper workpiece position and reducing the impact of deformation.

[0018] The cleaning component can effectively clean up excess welding slag, welding smoke or pollutants generated during the welding process to ensure the cleanliness of the workpiece surface and the quality of the welded part.

[0019] The cleaning component and the adjustment component work precisely together to perform preliminary cleaning of the splicing position before welding to reduce the impact of residues on welding. At the same time, they can be cleaned immediately after welding to prevent residues from affecting subsequent processes, and potential welding defects can be discovered in time during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A cross-sectional view of the overall internal structure provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the adjustment component provided in an embodiment of the present invention; Figure 4 A first exploded view of the regulating assembly structure provided by an embodiment of the present invention; Figure 5 A second exploded view of the regulating assembly structure provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a fixed block provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a cleaning component provided in an embodiment of the present invention; Figure 8 A cross-sectional view of the internal structure of a cleaning component provided in an embodiment of the present invention; Figure 9 This is an exploded view of the cleaning component structure provided by an embodiment of the present invention.

[0022] Description of reference numerals: 1. Base; 2. Adjustment assembly; 3. Clearance assembly; 11. Moving column; 21. Base; 22. Positioning block; 23. Driving member; 231. Driving rod; 24. First swing block; 25. Second swing block; 26. Elastic member; 27. Adjustment block; 271. Docking hole; 272. Rotation block; 273. Support plate; 274. Limiting rod; 28. Fixed block; 281. Support plate; 29. ​​Movable rod; 291. Movable block; 292, locking block; 31, fixed plate; 311, slide groove; 312, guide groove; 32, turntable; 321, protrusion; 322, cleaning plate; 33, driving plate; 34, moving block; 341, gear rod; 342, docking block; 343, leveling scraper; 35, limiting plate; 351, rotating shaft; 36, power plate; 37, ring; 371, annular groove; 38, connecting block; 39, power rod. DETAILED DESCRIPTION

[0023] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, or they can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example: See Figures 1-9 A welding device for a steel fire door includes a base 1, a movable column 11 is slidably installed at the end of the base 1, and a cleaning component 3 is slidably installed at the end of the movable column 11, and the cleaning component 3 is used to perform preliminary cleaning on the welding position of the protective door.

[0026] In this solution, a device with a telescopic function, such as an electric telescopic rod, is provided at the end of the base 1, and the electric telescopic rod drives the movable column 11 to move until it moves to a suitable position and stops.

[0027] At the same time, the cleaning component 3 is moved by the moving column 11, and the welding position is preliminarily cleaned by the cleaning component 3 to ensure that the welding position remains flat during welding.

[0028] Furthermore, an adjustment component 2 is assembled at the end of the base 1, and the fire door is protected in the docking and processing state through the adjustment component 2; wherein, the adjustment component 2 includes a base 21 fixedly connected to the base 1, and positioning blocks 22 are symmetrically fixedly installed at the ends of the base 21, and a driving member 23 is fixedly installed between the two positioning blocks 22.

[0029] In this embodiment, the driving member 23 is a device with power output such as a motor, and is connected to an external control device. When the driving member 23 is started, it synchronously drives the driving rod 231 fixedly installed at its output end to rotate.

[0030] Furthermore, a first swing block 24 is rotatably mounted on one side of the end of the positioning block 22 , and a second swing block 25 is rotatably mounted on the end of the positioning block 22 away from the first swing block 24 .

[0031] Specifically, the first swing block 24 and the second swing block 25 are in parallel and are limited by the positioning block 22 , thereby ensuring that the first swing block 24 and the second swing block 25 remain stable as a whole when subjected to force.

[0032] Furthermore, an elastic member 26 is rotatably mounted on the end of the second swing block 25 , and the end of the elastic member 26 is rotatably connected to the end of the base 21 .

[0033] Specifically, the elastic member 26 is a component with a buffering effect composed of a spring, a damper and other structures. The elastic member 26 buffers the force applied to the second swing block 25 to ensure that the protective door remains stable as a whole during welding.

[0034] Furthermore, a driving rod 231 is fixedly installed on the output end of the driving member 23, an adjusting block 27 is rotatably installed on the end of the driving rod 231, a rotating block 272 is rotatably installed on the end of the adjusting block 27, the end of the rotating block 272 is fixedly connected to the end of the driving rod 231, a supporting plate 273 is fixedly installed on the end of the rotating block 272, and a limiting rod 274 is rotatably installed on one side of the adjusting block 27.

[0035] Specifically, when the driving member 23 drives the driving rod 231 to rotate, it synchronously drives the rotating block 272 fixedly installed at the end of the driving rod 231 to rotate. Since the end of the rotating block 272 is fixedly installed with a support plate 273, the angle of the support plate 273 can be adjusted to make it suitable for different scenarios.

[0036] The middle of the support plate 273 is a telescopic rod, which can be freely extended and retracted when the support plate 273 moves, so as to meet the needs of different scenarios and reduce interference during operation.

[0037] A telescopic rod is provided at the end of the driving rod 231, and the end of the telescopic rod is longitudinally rotatably connected to the end of the rotating block 272, wherein the driving rod 231 can drive the rotating block 272 to rotate, and at the same time, when the entire adjustment block 27 moves downward, the connecting end of the rotating block 272 can be protected by the telescopic rod.

[0038] The limiting rod 274 is used to limit the two adjustment blocks 27 to prevent the adjustment blocks 27 from being separated from the set track, wherein the limiting rod 274 is a telescopic rod.

[0039] Furthermore, the ends of the adjustment block 27 are symmetrically provided with docking holes 271 , and the inner walls of the two docking holes 271 are rotatably connected to the ends of the first swing block 24 and the second swing block 25 , respectively.

[0040] Specifically, the first swing block 24 and the second swing block 25 are rotatably connected through the docking hole 271 provided on the adjustment block 27, so that when the rotating block 272 is forced to move downward, it can cooperate with the second swing block 25 and the elastic member 26 to buffer it.

[0041] Furthermore, a fixing block 28 is fixedly mounted on an end portion of the base 21 , and a support plate 281 is fixedly mounted on an end portion of the fixing block 28 .

[0042] Specifically, the lower end of the fixed block 28 is provided with a device with a telescopic function, such as an electric telescopic rod, which drives the fixed block 28 to move up and down, thereby driving the support plate 281 fixedly installed at its end to move until it fits with the outer surface of the protective door and stops.

[0043] Furthermore, a movable rod 29 is slidably mounted on one side of the fixed block 28 , a movable block 291 is fixedly mounted on the end of the movable rod 29 , and a locking block 292 is fixedly mounted on the end of the movable block 291 .

[0044] Specifically, the movable rod 29 moves to drive the movable block 291 fixedly installed at its end to move, and simultaneously drives the locking block 292 fixedly installed on the movable block 291 to move, thereby clamping the outer surface of the fire door and locking the fire door after it is fully adjusted.

[0045] By adjusting component 2, the workpiece is precisely positioned to ensure accurate docking of the workpiece during welding, avoiding loose or uneven welding due to position deviation. At the same time, the fine adjustment of adjustment component 2 allows workpieces of different sizes and shapes to be easily adapted, thereby improving the versatility of the equipment.

[0046] In addition, the locking block 292 preliminarily limits the fire door to facilitate subsequent docking.

[0047] Furthermore, the cleaning assembly 3 includes a fixed plate 31 slidably connected to the movable column 11 , a sliding groove 311 is provided at the end of the fixed plate 31 , a movable block 34 is slidably mounted on the inner wall of the sliding groove 311 , and a gear rod 341 is fixedly mounted at the end of the movable block 34 .

[0048] In this embodiment, when the moving block 34 is subjected to force, the gear rod 341 fixedly mounted on its end is driven to move, wherein the moving block 34 is limited by the sliding groove 311 , thereby limiting the moving trajectory of the moving block 34 .

[0049] Furthermore, a turntable 32 is rotatably installed at the end of the fixed plate 31, and a protrusion 321 is fixedly installed at the end of the turntable 32 and near the edge position. At the same time, a driving plate 33 is slidably installed on the outer surface of the protrusion 321. One side of the driving plate 33 is rotatably connected to the end of the fixed plate 31, and the end of the driving plate 33 is engaged with the outer surface of the gear rod 341.

[0050] Specifically, when the gear rod 341 moves, the drive plate 33 meshing with it is driven to move. Since one side of the drive plate 33 is rotatably connected to the end of the fixed plate 31, the drive plate 33 rotates around the connection with the fixed plate 31.

[0051] A groove is formed at the end of the driving plate 33 , and the inner wall of the groove is slidably connected to the outer surface of the protrusion 321 , so that when the driving plate 33 rotates, it cooperates with the protrusion 321 to drive the turntable 32 to rotate.

[0052] The end of the turntable 32 passes through and extends to the outside of the fixed plate 31. At the same time, a cleaning plate 322 is fixedly installed on the end of the turntable 32. The cleaning plate 322 is driven to rotate by the turntable 32, so that the welding position after the docking is completed can be cleaned, and impurities remaining after the welding is completed can also be removed.

[0053] Furthermore, a guide groove 312 is formed at the end of the fixing plate 31 , and a leveling scraper 343 is slidably mounted on the inner wall of the guide groove 312 . The end of the leveling scraper 343 is engaged with the outer surface of the gear rod 341 .

[0054] Specifically, the guide groove 312 is used to limit the leveling scraper 343 so that the leveling scraper 343 moves along the inner wall of the guide groove 312 , thereby protecting the leveling scraper 343 .

[0055] At the same time, the flatness after welding can be tested by the leveling scraper 343.

[0056] Furthermore, a limiting plate 35 is fixedly mounted on one side of the fixing plate 31 . The cross section of the limiting plate 35 is concave, and a rotating shaft 351 is rotatably mounted on the inner wall of the limiting plate 35 .

[0057] Specifically, a device with power output, such as a motor, is provided at the end of the limiting plate 35 and is connected to an external control device. At the same time, the output end of the motor is fixedly connected to the end of the rotating shaft 351. When the motor is started, it synchronously drives the rotating shaft 351 fixedly installed at its output end to rotate.

[0058] Furthermore, a power plate 36 is fixedly mounted on the outer surface of the rotating shaft 351 , and a power rod 39 is rotatably mounted on the end of the power plate 36 .

[0059] Specifically, when the rotating shaft 351 rotates, the power plate 36 is synchronously driven to rotate, wherein the outer surface of the rotating shaft 351 is provided with a movable groove, and the inner wall of the movable groove is embedded with the inner wall of the power plate 36, so that the power plate 36 can slide on the rotating shaft 351 and rotate synchronously with the rotating shaft 351.

[0060] At the same time, when the power plate 36 moves, the power rod 39 drives the ring 37 to rotate around the end of the connecting block 38 until it meets the current scene.

[0061] A device with a telescopic function, such as an electric telescopic rod, is fixedly installed on the end of the limiting plate 35 to drive the power plate 36 to move.

[0062] Furthermore, a connecting block 38 is fixedly mounted on the outer surface of the rotating shaft 351 , a circular ring 37 is rotatably mounted on the outer surface of the connecting block 38 , and an annular groove 371 is formed on the outer surface of the circular ring 37 .

[0063] Specifically, when the rotating shaft 351 rotates, the connecting block 38 fixedly mounted on its outer surface is synchronously driven to rotate. Since the end of the connecting block 38 is provided with a circular ring 37, the circular ring 37 rotates synchronously with the connecting block 38.

[0064] Furthermore, a docking block 342 is fixedly mounted on the end of the moving block 34 , and the outer surface of the docking block 342 is engaged with the inner wall of the annular groove 371 .

[0065] Specifically, when the ring 37 rotates, the annular groove 371 drives the docking block 342 to push, thereby driving the moving block 34 to move back and forth.

[0066] The cleaning component 3 can be used to clean the fire door after welding, and quickly remove welding slag, oxides and other impurities in the welding area. During the cleaning process, potential welding defects such as pores and cracks can be discovered in time and can be repaired immediately to avoid the accumulation of welding quality problems in subsequent work.

[0067] The control device can use a single-chip microcomputer as the control terminal. In this embodiment, the single-chip microcomputer is a typical embedded microcontroller (MCU), consisting of an arithmetic unit, a controller, memory, and input / output devices, equivalent to a miniature computer. Compared to the general-purpose microprocessors used in personal computers, it emphasizes self-sufficiency (no external hardware required) and cost savings. Its greatest advantages are its small size, allowing it to be placed inside the instrument, low memory capacity, simple input / output interfaces, and low functional consumption.

[0068] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A welding device for steel fire doors, characterized in that: It comprises a base (1), a movable column (11) is slidably mounted on the end of the base (1), and a cleaning component (3) is slidably mounted on the end of the movable column (11), and the cleaning component (3) is used to perform preliminary cleaning on the welding position of the protective door; An adjustment component (2) is assembled at the end of the base (1), and the fire door is protected in its docking and processing state by the adjustment component (2); The adjustment assembly (2) comprises a base (21) fixedly connected to the base (1), positioning blocks (22) are symmetrically fixedly mounted on the ends of the base (21), and a driving member (23) is fixedly mounted between the two positioning blocks (22); A first swing block (24) is rotatably mounted on one side of the end of the positioning block (22), and a second swing block (25) is rotatably mounted on the end of the positioning block (22) away from the first swing block (24); An elastic member (26) is rotatably mounted on the end of the second swing block (25), and the end of the elastic member (26) is rotatably connected to the end of the base (21); A driving rod (231) is fixedly mounted on the output end of the driving member (23); an adjusting block (27) is rotatably mounted on the end of the driving rod (231); a rotating block (272) is rotatably mounted on the end of the adjusting block (27); the end of the rotating block (272) is fixedly connected to the end of the driving rod (231); a supporting plate (273) is fixedly mounted on the end of the rotating block (272); and a limiting rod (274) is rotatably mounted on one side of the adjusting block (27); The end of the regulating block (27) is symmetrically provided with docking holes (271), and the inner walls of the two docking holes (271) are rotatably connected to the end of the first swing block (24) and the end of the second swing block (25), respectively. The cleaning assembly (3) comprises a fixed plate (31) slidably connected to the movable column (11), a sliding groove (311) is provided at the end of the fixed plate (31), a movable block (34) is slidably mounted on the inner wall of the sliding groove (311), and a gear rod (341) is fixedly mounted on the end of the movable block (34); A turntable (32) is rotatably mounted on the end of the fixed plate (31), a protrusion (321) is fixedly mounted on the end of the turntable (32) and close to the edge thereof, and a driving plate (33) is slidably mounted on the outer surface of the protrusion (321), one side of the driving plate (33) is rotatably connected to the end of the fixed plate (31), and the end of the driving plate (33) is meshed with the outer surface of the gear rod (341).

2. A welding device for a steel fire door according to claim 1, characterized in that: A fixing block (28) is fixedly mounted on the end of the base (21), and a support plate (281) is fixedly mounted on the end of the fixing block (28).

3. A welding device for a steel fire door according to claim 2, characterized in that: A movable rod (29) is slidably mounted on one side of the fixed block (28), a movable block (291) is fixedly mounted on the end of the movable rod (29), and a locking block (292) is fixedly mounted on the end of the movable block (291).

4. A welding device for a steel fire door according to claim 3, characterized in that: A guide groove (312) is provided at the end of the fixing plate (31), a leveling scraper (343) is slidably mounted on the inner wall of the guide groove (312), and the end of the leveling scraper (343) is engaged with the outer surface of the gear rod (341).

5. A welding device for a steel fire door according to claim 4, characterized in that: A limiting plate (35) is fixedly mounted on one side of the fixing plate (31), the cross section of the limiting plate (35) being concave, and a rotating shaft (351) is rotatably mounted on the inner wall of the limiting plate (35).

6. A welding device for a steel fire door according to claim 5, characterized in that: A power plate (36) is fixedly mounted on the outer surface of the rotating shaft (351), and a power rod (39) is rotatably mounted on the end of the power plate (36).

7. A welding device for a steel fire door according to claim 6, characterized in that: A connecting block (38) is fixedly mounted on the outer surface of the rotating shaft (351), a circular ring (37) is rotatably mounted on the outer surface of the connecting block (38), and an annular groove (371) is formed on the outer surface of the circular ring (37).

8. A welding device for a steel fire door according to claim 7, characterized in that: A docking block (342) is fixedly mounted on the end of the moving block (34), and the outer surface of the docking block (342) is engaged with the inner wall of the annular groove (371).

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