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 workbench, a welding assembly, a flattening assembly and a vibration assembly.The welding device independently controls entering of argon and helium by independently opening flow regulating valves on an argon pipe and a helium pipe, pure argon is suitable for thin or medium-thickness steel plates, and the welding assembly is suitable for welding of the steel fireproof door. Pure helium is suitable for thick steel plates, the welding speed and the fusion depth can be increased, the number of welding layers can be reduced, the argon pipe and the helium pipe can be opened at the same time, the flow adjusting valve can be started to control the input proportion of argon and helium, mixed gas is formed, and the welding device is suitable for medium-thickness plates and high in oxidation risk. The welding speed can be increased while the welding seam quality is guaranteed, the method is suitable for welding of most standard fireproof door steel plates, different thicknesses and materials can be flexibly coped, welding parameters are optimized, the quality is improved, meanwhile, the use amount of expensive helium is reduced, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fire door welding, and more specifically, to a welding device for steel fire doors. Background Art

[0002] Steel fire doors are important safety devices specifically designed to prevent the spread of fire and smoke during a fire. They are usually made of high-quality steel and have good fire resistance. They can maintain structural integrity and heat insulation for a certain period of time, buying precious time for personnel evacuation and fire fighting and rescue. When processing steel fire doors, different metal components need to be firmly connected together by welding to form an integral structure. Good welding technology helps to improve the sealing performance of the door body, reduce the penetration of heat, smoke and toxic gases, thus buying more time for personnel evacuation.

[0003] Using arc welding technology to weld and manufacture steel fire doors is a common technical means. During welding, first, according to the design requirements of the fire door, select a suitable type of steel (such as cold-rolled steel, galvanized steel, etc.) and ensure that its thickness meets the standard. Then, thoroughly clean the area to be welded. The welding machine provides a constant current power supply, and an arc is generated through a non-consumable tungsten electrode. When the tungsten electrode approaches the workpiece and a sufficient voltage is applied, an arc will be generated between the tungsten electrode and the workpiece. This arc heats the workpiece to a molten state, and a stable layer of inert gas (such as argon) is provided to the welding area through the welding torch nozzle to prevent the molten pool and the heat-affected zone from reacting with oxygen, nitrogen, etc. in the air, avoiding oxidation and nitriding phenomena and ensuring the welding quality. After welding, a preliminary quality inspection is carried out, and defective parts are repaired if necessary.

[0004] In the actual use process of the prior art, since most existing welding equipment uses single gas protection (such as pure argon), different thicknesses and types of fire doors have different thermal conductivities and heat capacities during welding. Single gas protection may not be able to provide the optimal cooling effect for all materials or is insufficient to maintain appropriate arc characteristics, making it difficult to meet the welding requirements of various materials for fire doors. Therefore, in view of the above technical problems, it is necessary to provide a welding device for steel fire doors. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device for steel fire doors to solve the above problems.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows: A welding device for a steel fire door, comprising a workbench, a welding assembly, a flattening assembly and a vibration assembly. A cooling plate is inlaid and fixed in the middle of the inner cavity of the workbench. The cooling plate includes a heat-conducting copper plate. A continuous S-shaped flow pipe is inlaid and fixed in the inner cavity of the cooling plate. Moving assemblies are installed on both sides of the workbench. The welding assembly includes an electric push rod II fixedly connected to the middle of the lower surface of the moving assembly. The lower end of the electric push rod II is fixedly connected with an air hood. A welding head is installed in the middle of the inner cavity of the air hood. An annular pipe is fixedly connected in the inner cavity of the air hood. Connecting pipes are communicated with the outer surface of the annular pipe. The connecting pipes penetrate through the air hood and are respectively communicated with an argon gas pipe and a helium gas pipe. Flow regulating valves are installed on both the argon gas pipe and the helium gas pipe. A mixing pipe is communicated with the connecting pipe. A spiral sheet is fixedly connected in the inner cavity of the mixing pipe. The flattening assembly includes a connecting plate fixedly connected to the outer surface of the air hood. Two sleeves are symmetrically and fixedly connected to the lower surface of the connecting plate. A sleeve rod is slidably connected in the inner cavity of the sleeve. The lower end of the sleeve rod is fixedly connected with a connecting rod. Flattening rollers are rotatably connected to both ends of the connecting rod. The vibration assembly includes branch pipes symmetrically communicated with the outer surface of the connecting pipe. Solenoid valves are installed on the branch pipes. An annular block is fixedly connected in the inner cavity of the branch pipe. An elastic ball abuts against the inner cavity of the annular block.

[0007] As a further improvement of the present invention, a plurality of support legs are evenly and fixedly connected to the lower surface of the workbench. Two side plates are symmetrically and fixedly connected to the upper surface of the workbench. Two electric push rods I are symmetrically and fixedly connected to one side of the side plates. The other end of the electric push rod I is fixedly connected with a positioning plate. A rubber pad is fixedly connected to the outer surface of the positioning plate.

[0008] As a further improvement of the present invention, the moving assembly includes moving grooves symmetrically opened on both sides of the workbench. A screw rod I is rotatably connected in the inner cavity of the left moving groove. A limiting rod is fixedly connected in the inner cavity of the right moving groove. Moving blocks I are movably connected in the inner cavities of both moving grooves. The outer surface of the screw rod I is threadedly connected with the inner cavity of the moving block I. The outer surface of the limiting rod is movably connected with the inner cavity of the moving block I.

[0009] As a further improvement of the present invention, a mounting plate is fixedly connected to the outer surface of the workbench. A motor I is fixedly connected to the outer surface of the mounting plate. The output shaft end of the motor I penetrates through the workbench and is fixedly connected with the other end of the screw rod I.

[0010] As a further improvement of the present invention, a U-shaped rod is fixedly connected to the upper surface of the moving block I. A screw rod II is rotatably connected in the inner cavity of the U-shaped rod. A moving block II is threadedly connected to the outer surface of the screw rod II. The moving block II moves in the inner cavity of the U-shaped rod.

[0011] As a further improvement of the present invention, a second motor is fixedly connected to one side of the U-shaped rod. The output shaft end of the second motor penetrates through the U-shaped rod and is fixedly connected to a second screw rod. The lower surface of the second moving block is fixedly connected to the upper end of the second electric push rod.

[0012] As a further improvement of the present invention, a plurality of spray pipes are evenly communicated with the inner side of the annular pipe. Two holes are symmetrically opened on the spray pipe. A telescopic rod is fixedly connected to the inner wall of the hole of the spray pipe. A blocking air ball abuts against the inner cavity of the spray pipe.

[0013] As a further improvement of the present invention, convex blocks are symmetrically fixed on the outer surface of the blocking air ball. The other end of the telescopic rod is fixedly connected to the convex block of the blocking air ball. A first spring is sleeved on the outer surface of the telescopic rod. One end of the first spring is fixedly connected to the inner wall of the hole of the spray pipe. The other end of the first spring is fixedly connected to the convex block of the blocking air ball.

[0014] As a further improvement of the present invention, a second spring is fixedly connected to the upper surface of the sleeve rod. The upper end of the second spring is fixedly connected to the top of the inner cavity of the sleeve. A plurality of L-shaped rods are evenly fixedly connected to the outer surface of the connecting rod. A cleaning sponge is fixedly connected to the lower end of the L-shaped rod.

[0015] As a further improvement of the present invention, two sliding grooves are symmetrically opened in the inner cavity of the annular block. A sliding rod is slidably connected to the inner cavity of the sliding groove. The upper end of the sliding rod is fixedly connected to a third spring. The upper end of the third spring is fixedly connected to the top of the inner cavity of the sliding groove. Convex blocks are symmetrically fixed on the outer surface of the elastic ball. The lower end of the sliding rod is fixedly connected to the convex block of the elastic ball.

[0016] Compared with the prior art, the advantages of the present invention are as follows: (1) In this solution, the positioning plate is driven by the first electric push rod to move, so as to accurately position and clamp the two steel plates, ensuring that there is no displacement of the workpiece during the welding process. A cooling plate is inlaid and fixed in the middle of the inner cavity of the workbench. The heat-conducting copper plate is closely attached to the weld area, and a serpentine flow pipe is embedded inside. The welding heat is quickly exported through the circulating cooling water. The high thermal conductivity of copper quickly conducts the weld heat to the flow pipe, and the cooling water takes away the heat, realizing the cooling rate, avoiding thermal deformation or oxidation caused by overheating of the weld, shortening the high-temperature residence time, preventing local softening or grain coarsening of the steel plate. During welding, the first motor is started to drive the first screw rod to rotate, driving the first moving block to move horizontally along the limiting rod. Then the second motor is started to drive the second screw rod to rotate, so that the second moving block moves longitudinally to adjust the position of the welding head, realizing precise trajectory control and welding different positions. (2) In this solution, the argon gas pipe, helium gas pipe and annular pipe are respectively connected through a connecting pipe. The flow regulating valve is started to control the input of argon gas and helium gas. By separately opening the flow regulating valves on the argon gas pipe and helium gas pipe, the entry of argon gas and helium gas can be separately controlled. Pure argon gas is suitable for thin or medium-thickness steel plates and is suitable for scenarios that require uniform welds and have a high oxidation risk. It can provide a better weld appearance and a lower oxidation rate. Pure helium gas is suitable for thicker steel plates, can increase the welding speed and penetration depth, reduce the number of welding layers, and the argon gas pipe and helium gas pipe can be opened simultaneously. The flow regulating valve is started to control the input ratio of argon gas and helium gas to form a mixed gas, which is applicable to medium-thick plates. It can improve the welding speed while ensuring the weld quality, is suitable for welding the steel plates of most standard fire doors. By adjusting the ratio, it can flexibly respond to different thicknesses and materials, optimize the welding parameters, improve the quality, and at the same time reduce the usage of expensive helium gas and lower the cost; (3) In this solution, the protective gas is ejected through a nozzle to form a protective layer to isolate oxygen and nitrogen, avoiding oxidation or nitride defects. The protective gas will impact the blocking balloon and move it outward to leak out of the opening of the nozzle. At this time, the gas will be blocked by the blocking balloon and diffuse from the outer wall of the blocking balloon to form an annular diversion channel to cover the welding area, rather than directly impacting the welding head, avoiding too much gas directly blowing towards the tungsten electrode at the lower end of the welding head and dispersing the arc; (4) In this solution, by controlling the periodic on-off of the solenoid valve on the branch pipe, an intermittent gas pressure is generated to drive the elastic ball to move downward and impact the upper surfaces on both sides of the steel plate weld. By adjusting the pulse frequency of the solenoid valve, the vibration intensity of the elastic ball is controlled, so that the elastic ball intermittently impacts the steel plate at an appropriate vibration intensity to form high-frequency vibration. The vibration will be transmitted to the steel plate weld area, causing microscopic plastic deformation of the material, dispersing the residual thermal stress, reducing the risk of stress concentration, and reducing the cracking hazard in subsequent use. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the overall side structural schematic diagram of the present invention; Figure 3 is the semi-sectional internal structural schematic diagram of the present invention; Figure 4 is the side-sectional internal structural schematic diagram of the present invention; Figure 5 is the split structural schematic diagram of the cooling plate of the present invention; Figure 6 is the split structural schematic diagram of the annular pipe of the present invention; Figure 7 is the sectional internal structural schematic diagram of the flattening assembly of the present invention; Figure 8 is the sectional internal structural schematic diagram of the vibration assembly of the present invention.

[0018] Description of reference numerals in the figure: 1. Workbench; 101. Support leg; 102. Side plate; 103. First electric push rod; 104. Positioning plate; 2. Cooling plate; 201. Heat-conducting copper plate; 202. Flow tube; 3. Moving assembly; 301. Moving groove; 302. First screw rod; 303. Limiting rod; 304. Mounting plate; 305. First motor; 306. First moving block; 307. U-shaped rod; 308. Second screw rod; 309. Second moving block; 310. Second motor; 4. Welding assembly; 401. Second electric push rod; 402. Gas hood; 403. Welding head; 404. Annular tube; 4041. Nozzle; 4042. Telescopic rod; 4043. Balloon stopper; 4044. First spring; 405. Connecting tube; 406. Argon tube; 407. Helium tube; 408. Flow regulating valve; 409. Mixing tube; 410. Spiral fin; 5. Flattening assembly; 501. Connecting plate; 502. Sleeve; 503. Sleeve rod; 504. Second spring; 505. Connecting rod; 506. Flattening roller; 507. L-shaped rod; 508. Cleaning sponge; 6. Vibration assembly; 601. Branch pipe; 602. Solenoid valve; 603. Annular block; 604. Chute; 605. Slide bar; 606. Elastic ball; 607. Third spring. Specific implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figures 1 - 5 , a welding device for a steel fire door, including a workbench 1, a welding assembly 4, a flattening assembly 5 and a vibration assembly 6. A cooling plate 2 is fixedly embedded in the middle of the inner cavity of the workbench 1. The cooling plate 2 includes a heat-conducting copper plate 201, and a continuous S-shaped flow tube 202 is fixedly embedded in the inner cavity of the cooling plate 2. Moving assemblies 3 are installed on both sides of the workbench 1.

[0021] Specifically, a plurality of support legs 101 are uniformly fixedly connected to the lower surface of the workbench 1, two side plates 102 are symmetrically fixedly connected to the upper surface of the workbench 1, two first electric push rods 103 are symmetrically fixedly connected to one side of the side plates 102, the other ends of the first electric push rods 103 are fixedly connected to a positioning plate 104, and a rubber pad is fixedly connected to the outer surface of the positioning plate 104.

[0022] The moving assembly 3 includes moving grooves 301 symmetrically arranged on both sides of the workbench 1, the inner cavity of the left moving groove 301 is rotatably connected to a screw rod 302, the inner cavity of the right moving groove 301 is fixedly connected to a limit rod 303, the inner cavities of the two moving grooves 301 are both movably connected to a moving block 306, the outer surface of the screw rod 302 is threadedly connected to the inner cavity of the moving block 306, the outer surface of the limit rod 303 is movably connected to the inner cavity of the moving block 306, the outer surface of the workbench 1 is fixedly connected to a mounting plate 304, and the outer surface of the mounting plate 304 is fixedly connected to the inner cavity of the moving block 306. It is connected to a motor 305, the output shaft end of the motor 305 passes through the workbench 1 and is fixedly connected to the other end of the screw 302, a U-shaped rod 307 is fixedly connected to the upper surface of the moving block 306, the inner cavity of the U-shaped rod 307 is rotatably connected to a screw 2 308, the outer surface of the screw 2 308 is threadedly connected to a moving block 2 309, the moving block 2 309 moves in the inner cavity of the U-shaped rod 307, a motor 2 310 is fixedly connected to one side of the U-shaped rod 307, the output shaft end of the motor 2 310 passes through the U-shaped rod 307 and is fixedly connected to the screw 2 308.

[0023] Furthermore, the workbench 1 is firmly supported by the support legs 101 to provide a stable welding platform. During welding, the fire door steel plate to be welded is first placed on the workbench 1, and then the electric push rod 103 is started to drive the positioning plate 104 to move, and the two steel plates are accurately positioned and clamped to ensure that there is no displacement of the workpiece during welding. A cooling plate 2 is embedded and fixed in the middle of the inner cavity of the workbench 1. The cooling plate 2 is close to the weld area through the heat-conducting copper plate 201, and a continuous S-bend flow pipe 202 is embedded inside. Both ends of the flow pipe 202 are connected to the external circulating cooling water, and the circulating cooling water (flow rate 5-10L / min) is used to quickly conduct the welding heat. The high thermal conductivity of copper quickly conducts the weld heat to the flow pipe, and the cooling water takes away the heat to achieve a cooling rate, thereby avoiding thermal deformation or oxidation caused by overheating of the weld, shortening the high-temperature residence time, and preventing local softening or grain coarsening of the steel plate.

[0024] During welding, start motor 1 305 to drive screw 1 302 to rotate, driving moving block 1 306 to move laterally along limit rod 303, then start motor 2 310 to drive screw 2 308 to rotate, causing moving block 2 309 to move longitudinally, adjusting the position of welding head 403, achieving precise trajectory control, and performing welding at different positions.

[0025] Embodiment 2: See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6, A welding device for a steel fire door, further comprising a welding assembly 4, which includes an electric push rod two 401 fixedly connected to the middle of the lower surface of the moving assembly 3. The lower end of the electric push rod two 401 is fixedly connected with an air hood 402. A welding head 403 is installed in the middle of the inner cavity of the air hood 402. An annular pipe 404 is fixedly connected to the inner cavity of the air hood 402. A connecting pipe 405 is communicated with the outer surface of the annular pipe 404. The connecting pipe 405 penetrates through the air hood 402 and is respectively communicated with an argon pipe 406 and a helium pipe 407. Flow regulating valves 408 are installed on both the argon pipe 406 and the helium pipe 407. A mixing pipe 409 is communicated with the connecting pipe 405. A spiral piece 410 is fixedly connected to the inner cavity of the mixing pipe 409.

[0026] Specifically, the lower surface of the moving block two 309 is fixedly connected to the upper end of the electric push rod two 401. A plurality of spray pipes 4041 are evenly communicated with the inner side of the annular pipe 404. Two holes are symmetrically opened on the spray pipe 4041. A telescopic rod 4042 is fixedly connected to the inner wall of the hole of the spray pipe 4041. A blocking air ball 4043 abuts against the inner cavity of the spray pipe 4041. Convex blocks are symmetrically fixed on the outer surface of the blocking air ball 4043. The other end of the telescopic rod 4042 is fixedly connected to the convex block of the blocking air ball 4043. A first spring 4044 is sleeved on the outer surface of the telescopic rod 4042. One end of the first spring 4044 is fixedly connected to the inner wall of the hole of the spray pipe 4041, and the other end of the first spring 4044 is fixedly connected to the convex block of the blocking air ball 4043.

[0027] Furthermore, the welding head 403 uses a non-consumable tungsten electrode, which will not melt and become part of the weld during the welding process. The end of the electrode is spherical, which helps to stabilize the arc and improve the welding quality. The outer surface of the welding head 403 is wrapped with an air hood 402, and protective gas (argon and helium) is continuously transported inside through the annular pipe 404. The annular pipe 404 is respectively communicated with the argon pipe 406 and the helium pipe 407 through the connecting pipe 405, and the input of argon and helium is controlled by the flow regulating valve 408.

[0028] Solution 1: Only open the flow regulating valve 408 on the argon pipe 406 to control the entry of argon. Pure argon is suitable for thinner or medium-thickness steel plates because argon has good protection and is suitable for scenarios that require uniform welds and high oxidation risks. For example, when welding thin plates (such as coated plates, polished decorative doors), argon can effectively prevent oxidation, and the arc is stable, suitable for precision welding, and can provide a better weld appearance and a lower oxidation rate.

[0029] Solution 2: Only open the flow regulating valve 408 on the helium gas pipe 407 to control the entry of helium. Pure helium is suitable for relatively thick steel plates (such as multi-layer structure door frames) because the high heat input of helium can improve the welding efficiency, increase the penetration depth, and reduce the number of welding layers. However, it is necessary to consider whether the protection effect is sufficient, and it may be necessary to increase the gas flow rate or adjust the welding parameters, such as increasing the current or voltage, to compensate for the insufficient shielding gas and improve the welding speed and penetration depth.

[0030] Solution 3: Open the argon gas pipe 406 and the helium gas pipe 407 simultaneously, and control the input ratio of argon and helium through the flow regulating valve 408. The mixing ratio of argon and helium (such as Ar:He = 1:1 or 3:1). The mixed gas is suitable for medium-thick plates (such as the connection between the door frame and the panel), especially in cases where higher welding quality and efficiency are required. By adjusting the argon-helium ratio, the welding speed can be increased while ensuring the weld quality, which is suitable for the welding of most standard fire door steel plates. By adjusting the ratio, it is possible to flexibly respond to different thicknesses and materials, optimize the welding parameters, improve the quality, and at the same time reduce the usage of expensive helium gas and lower the cost.

[0031] The mixing pipe 409 evenly mixes the two gases through the internal spiral fins 410 and then sends them into the welding area. When the two gases pass through the mixing pipe 409, the spiral fins 410 force the gas flow direction to change repeatedly, generating a large number of vortices and radial velocity gradients to ensure the rapid mixing of the two gases. A protective layer is formed through the gas hood 402 to suppress the plasma, reduce the attenuation of laser and arc energy, isolate oxygen and nitrogen, and avoid oxidation or nitride defects.

[0032] After the gas is ejected through the nozzle 4041, it will impact the blocking balloon 4043 to move outward and expose the opening of the nozzle 4041. At this time, the gas will diffuse from the outer wall of the blocking balloon 4043 due to the blockage of the blocking balloon 4043, forming an annular diversion channel to cover the welding area, rather than directly impacting the welding head 403, avoiding too much gas directly blowing on the tungsten electrode at the lower end of the welding head 403 and dispersing the arc. The blocking balloon 4043 is automatically reset through the spring 4044.

[0033] Example 3: Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 7 , a welding device for a steel fire door, further comprising a flattening assembly 5, including a connecting plate 501 fixedly connected to the outer surface of the gas hood 402. Two sleeves 502 are symmetrically and fixedly connected to the lower surface of the connecting plate 501. A sleeve rod 503 is slidably connected to the inner cavity of the sleeve 502. The lower end of the sleeve rod 503 is fixedly connected to a connecting rod 505. Flattening rollers 506 are rotatably connected to both ends of the connecting rod 505.

[0034] Specifically, a second spring 504 is fixedly connected to the upper surface of the sleeve rod 503, and the upper end of the second spring 504 is fixedly connected to the top of the inner cavity of the sleeve 502. A plurality of L-shaped rods 507 are evenly and fixedly connected to the outer surface of the connecting rod 505, and a cleaning sponge 508 is fixedly connected to the lower end of the L-shaped rod 507.

[0035] Furthermore, the connecting rod 505 and the flattening roller 506 form an elastic pressing system through the sleeve 502, the sleeve rod 503 and the second spring 504, which applies a uniform pressure to the joint of the steel plate in real time. The pressure suppresses the local convex wavy patterns generated by the thermal expansion of the steel plate, ensuring the flatness of the surface of the welded steel plate. The flattening roller 506 moves synchronously with the moving component 3. Before welding, the surface of the steel plate is flattened first. The flattening roller 506 carries the cleaning sponge 508 through the L-shaped rod 507 to clean the surface of the weld seam one step before the flattening action.

[0036] Embodiment 4: Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 8 , a welding device for a steel fire door, further comprising a vibration component 6, including branch pipes 601 symmetrically connected to the outer surface of the connecting pipe 405. An electromagnetic valve 602 is installed on the branch pipe 601. An annular block 603 is fixedly connected to the inner cavity of the branch pipe 601, and an elastic ball 606 abuts against the inner cavity of the annular block 603.

[0037] Specifically, two chutes 604 are symmetrically opened in the inner cavity of the annular block 603. A sliding rod 605 is slidably connected to the inner cavity of the chute 604. The upper end of the sliding rod 605 is fixedly connected to a third spring 607, and the upper end of the third spring 607 is fixedly connected to the top of the inner cavity of the chute 604. Convex blocks are symmetrically and fixedly connected to the outer surface of the elastic ball 606, and the lower end of the sliding rod 605 is fixedly connected to the convex block of the elastic ball 606.

[0038] Furthermore, two branch pipes 601 are symmetrically connected to the outer surface of the connecting pipe 405. The electromagnetic valve 602 on the branch pipe 601 is periodically turned on and off. The intermittent gas pressure drives the elastic ball 606 to move downward and impact the upper surfaces on both sides of the steel plate weld seam. The elastic ball 606 is limited in the moving interval through the chute 604 and the sliding rod 605, and the automatic reset is improved through the third spring 607. The intermittent impact of the elastic ball 606 on the steel plate forms high-frequency vibration. The vibration will be transmitted to the steel plate weld seam area, causing microscopic plastic deformation of the material, dispersing the residual thermal stress, reducing the risk of stress concentration, and reducing the cracking hidden danger in subsequent use. The vibration intensity of the elastic ball 606 is controlled by adjusting the pulse frequency of the electromagnetic valve, such as 50 - 200 Hz.

[0039] Working principle: During the use of the device, the workbench 1 is stably supported by the support legs 101 to provide a stable welding platform. When welding, first place the fire door steel plate to be welded on the workbench 1, and then start the electric push rod 103 to drive the positioning plate 104 to move, accurately position and clamp the two steel plates to ensure that the workpiece has no displacement during the welding process. In the middle of the inner cavity of the workbench 1, a cooling plate 2 is embedded and fixed. The cooling plate 2 is closely attached to the weld area through the heat-conducting copper plate 201, and a continuous S-shaped flow tube 202 is embedded inside. The welding heat is quickly exported through circulating cooling water. The high thermal conductivity of copper quickly conducts the weld heat to the flow tube, and the cooling water takes away the heat to achieve the cooling rate, avoiding thermal deformation or oxidation caused by overheating of the weld. When welding, start the motor 305 to drive the screw 302 to rotate, drive the moving block 306 to move horizontally along the limiting rod 303, and then start the motor 310 to drive the screw 308 to rotate, so that the moving block 309 moves longitudinally to adjust the position of the welding head 403 to achieve precise trajectory control and weld different positions.

[0040] The outer surface of the welding head 403 is wrapped with an air hood 402, and protective gases argon and helium are continuously supplied inside through the annular tube 404. The annular tube 404 is respectively connected to the argon tube 406 and the helium tube 407 through the connecting tube 405. The input of argon and helium is controlled by the flow regulating valve 408. Scheme 1: Only open the flow regulating valve 408 on the argon tube 406 to control the entry of argon. Pure argon is suitable for thinner or medium-thickness steel plates because argon has good protection and is suitable for scenarios that require uniform welds and high oxidation risk. Scheme 2: Only open the flow regulating valve 408 on the helium tube 407 to control the entry of helium. Pure helium is suitable for thicker steel plates because the high heat input of helium can improve the welding efficiency, increase the penetration depth, reduce the number of welding layers, and improve the welding speed and penetration depth. Scheme 3: Open both the argon tube 406 and the helium tube 407 at the same time, and control the input ratio of argon and helium through the flow regulating valve 408. The mixed gas is applicable to medium-thick plates. It can improve the welding speed while ensuring the weld quality and is suitable for welding most standard fire door steel plates. By adjusting the ratio, it can flexibly cope with different thicknesses and materials. The mixing tube 409 evenly mixes the two gases through the internal spiral fins 410 and then sends them into the welding area. A protective layer is formed through the air hood 402 to suppress the plasma and reduce the attenuation of laser and arc energy. After the gas is ejected through the nozzle 4041, it will impact the blocking balloon 4043 to move outward and leak out of the opening of the nozzle 4041. At this time, the gas will be blocked by the blocking balloon 4043 and diffuse from the outer wall of the blocking balloon 4043 to form an annular diversion channel to cover the welding area, rather than directly impacting the tungsten electrode at the lower end of the welding head 403 to blow away the arc. The blocking balloon 4043 is automatically reset through the spring 4044.

[0041] The connecting rod 505 and the flattening roller 506 form an elastic pressing system through the sleeve 502, the sleeve rod 503 and the second spring 504, which applies a uniform pressure to the joint of the steel plate in real time. The pressure suppresses the local convex corrugations generated by the thermal expansion of the steel plate, ensuring the flat surface of the steel plate after welding. The flattening roller 506 moves synchronously with the moving assembly 3 and flattens the surface of the steel plate before welding. The flattening roller 506 carries a cleaning sponge 508 through the L-shaped rod 507 to clean the surface of the weld seam one step before the flattening action.

[0042] Two branch pipes 601 are symmetrically connected to the outer surface of the connecting pipe 405. The solenoid valves 602 on the branch pipes 601 are periodically switched on and off. The intermittent gas pressure drives the elastic ball 606 to move downward and impact the upper surfaces on both sides of the weld seam of the steel plate. The elastic ball 606 is limited to the moving range through the chute 604 and the slide rod 605, and the automatic reset is improved through the third spring 607. The intermittent impact of the elastic ball 606 on the steel plate forms high-frequency vibration. The vibration will be transmitted to the weld seam area of the steel plate, causing microscopic plastic deformation of the material, dispersing the residual thermal stress, reducing the risk of stress concentration, and reducing the hidden danger of cracking in subsequent use.

[0043] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0044] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners that can be understood by those skilled in the art.

Claims

1. A welding device for a steel fire door, characterized in that: include: A workbench (1), wherein a cooling plate (2) is embedded and fixed in the middle of an inner cavity of the workbench (1), the cooling plate (2) comprises a heat-conducting copper plate (201), a continuous S-shaped flow tube (202) is embedded and fixed in the inner cavity of the cooling plate (2), and moving components (3) are installed on both sides of the workbench (1); A welding assembly (4), comprising an electric push rod 2 (401) fixedly connected to the middle part of the lower surface of the moving assembly (3), the lower end of the electric push rod 2 (401) being fixedly connected to a gas hood (402), a welding head (403) being installed in the middle part of the inner cavity of the gas hood (402), an annular tube (404) being fixedly connected to the inner cavity of the gas hood (402), a connecting tube (405) being connected to the outer surface of the annular tube (404), the connecting tube (405) penetrating the gas hood (402) and being respectively connected to an argon gas tube (406) and a helium gas tube (407), flow regulating valves (408) being installed on the argon gas tube (406) and the helium gas tube (407), the connecting tube (405) being connected to a mixing tube (409), and a spiral sheet (410) being fixedly connected to the inner cavity of the mixing tube (409); A flattening assembly (5) comprises a connecting plate (501) fixedly connected to the outer surface of the gas hood (402), two sleeves (502) being symmetrically fixedly connected to the lower surface of the connecting plate (501), a sleeve rod (503) being slidably connected to the inner cavity of the sleeve rod (502), a connecting rod (505) being fixedly connected to the lower end of the sleeve rod (503), and flattening rollers (506) being rotatably connected to both ends of the connecting rod (505); The vibration component (6) comprises a branch pipe (601) symmetrically connected to the outer surface of the connecting pipe (405), a solenoid valve (602) being installed on the branch pipe (601), an annular block (603) being fixedly connected to the inner cavity of the branch pipe (601), and an elastic ball (606) being abutted against the inner cavity of the annular block (603).

2. A welding device for a steel fire door according to claim 1, characterized in that: The lower surface of the workbench (1) is evenly and fixedly connected to a plurality of support legs (101); the upper surface of the workbench (1) is symmetrically and fixedly connected to two side panels (102); one side of the side panel (102) is symmetrically and fixedly connected to two electric push rods (103); the other end of the electric push rod (103) is fixedly connected to a positioning plate (104); and the outer surface of the positioning plate (104) is fixedly connected to a rubber pad.

3. A welding device for a steel fire door according to claim 1, characterized in that: The moving assembly (3) comprises moving grooves (301) symmetrically arranged on both sides of the workbench (1); a screw rod (302) is rotatably connected to the inner cavity of the left moving groove (301); a limit rod (303) is fixedly connected to the inner cavity of the right moving groove (301); the inner cavities of the two moving grooves (301) are both movably connected to a moving block (306); the outer surface of the screw rod (302) is threadedly connected to the inner cavity of the moving block (306); and the outer surface of the limit rod (303) is movably connected to the inner cavity of the moving block (306).

4. A welding device for a steel fire door according to claim 3, characterized in that: The outer surface of the workbench (1) is fixedly connected to a mounting plate (304), the outer surface of the mounting plate (304) is fixedly connected to a motor 1 (305), and the output shaft end of the motor 1 (305) passes through the workbench (1) and is fixedly connected to the other end of the screw rod 1 (302).

5. A welding device for a steel fire door according to claim 3, characterized in that: The upper surface of the moving block 1 (306) is fixedly connected to a U-shaped rod (307), the inner cavity of the U-shaped rod (307) is rotatably connected to a screw rod 2 (308), the outer surface of the screw rod 2 (308) is threadedly connected to a moving block 2 (309), and the moving block 2 (309) moves in the inner cavity of the U-shaped rod (307).

6. A welding device for a steel fire door according to claim 5, characterized in that: One side of the U-shaped rod (307) is fixedly connected to a second motor (310); an output shaft end of the second motor (310) passes through the U-shaped rod (307) and is fixedly connected to a second screw rod (308); and a lower surface of the second moving block (309) is fixedly connected to an upper end of a second electric push rod (401).

7. A welding device for a steel fire door according to claim 1, characterized in that: The inner side of the annular tube (404) is evenly connected with a plurality of nozzles (4041), and two holes are symmetrically provided on the nozzles (4041). A telescopic rod (4042) is fixedly connected to the inner wall of the hole of the nozzles (4041), and a blocking balloon (4043) is abutted against the inner cavity of the nozzles (4041).

8. A welding device for a steel fire door according to claim 7, characterized in that: The outer surface of the balloon baffle (4043) is symmetrically fixed with protrusions, the other end of the telescopic rod (4042) is fixedly connected to the protrusion of the balloon baffle (4043), the outer surface of the telescopic rod (4042) is sleeved with a spring 1 (4044), one end of the spring 1 (4044) is fixedly connected to the inner wall of the hole of the nozzle (4041), and the other end of the spring 1 (4044) is fixedly connected to the protrusion of the balloon baffle (4043).

9. A welding device for a steel fire door according to claim 1, characterized in that: The upper surface of the sleeve rod (503) is fixedly connected to a second spring (504), the upper end of the second spring (504) is fixedly connected to the top of the inner cavity of the sleeve (502), the outer surface of the connecting rod (505) is evenly fixedly connected to a plurality of L-shaped rods (507), and the lower end of the L-shaped rod (507) is fixedly connected to a cleaning sponge (508).

10. A welding device for a steel fire door according to claim 1, characterized in that: The inner cavity of the annular block (603) is symmetrically provided with two slide grooves (604), the inner cavity of the slide groove (604) is slidably connected with a slide rod (605), the upper end of the slide rod (605) is fixedly connected with a spring three (607), the upper end of the spring three (607) is fixedly connected to the top of the inner cavity of the slide groove (604), the outer surface of the elastic ball (606) is symmetrically fixedly connected with a protrusion, and the lower end of the slide rod (605) is fixedly connected to the protrusion of the elastic ball (606).

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