Walking beam heating furnace and maintenance method and equipment thereof

Abstract

An embodiment of the present invention provides a walking-beam heating furnace and a maintenance method and equipment thereof, wherein the walking-beam heating furnace includes a movable beam and a fixed beam, and the movable beam and the fixed beam both include a beam body, and an arc-shaped positioning groove block is welded on the upper surface of the beam body, and the curvature of the arc-shaped positioning groove block on the side welded to the beam body is adapted to the curvature of the beam body surface, and an installation groove is provided on the upper surface of the arc-shaped positioning groove block, and a slider is welded in the installation groove, and the shape and size of the installation groove are adapted to the shape and size of the bottom surface of the slider. In order to improve the connection stability of the slider and the movable beam or the fixed beam in the present application, an arc-shaped positioning groove block is welded on the beam body, and the lower surface of the arc-shaped positioning groove block has the same curvature as the outer wall of the beam body, and is tightly attached to the beam body to form an inner arc friction force, and the slider is embedded in the middle of the arc-shaped positioning groove block and fixed by welding, thereby fixing the slider more firmly to the beam body.

Description

Technical Field

[0001] The present invention relates to the field of heating furnaces, and in particular to a walking beam heating furnace and a maintenance method and equipment thereof. Background Art

[0002] In the existing steel industry's bar and wire, and even in the industry's walking beam heating furnace technology, sliders are provided on the moving beam and the fixed beam to hold high-temperature steel billets. This has both advantages and disadvantages. The advantage is that the sliders are not only wear-resistant, but also easy to repair, and in the absence of impact, the sliders are firmly connected to the moving beam and the fixed beam using a welding process; the disadvantage is that there will be a certain impact at both ends of the steel billet when it is taken out of the furnace or put into the furnace, resulting in a certain probability of the slider falling off. After the slider falls off, the furnace needs to be stopped for processing, affecting production efficiency.

[0003] In the prior art, there are mainly two representative processing methods:

[0004] First, as in application number 201520880354.X, a welding clamp rod capable of repairing the walking beam slider of a heating furnace at high temperatures was also provided. However, under current safety regulations, especially after the promulgation of the new safety law, the use of such uninsulated welding clamps is prohibited. The repair method is not easy to operate, and workers cannot brave the high temperatures. Furthermore, the safety risk factor is high, resulting in poor welding quality.

[0005] Second: furnace shutdown treatment. The operators wait until the temperature of the furnace wall in the heating furnace drops to about 60-80 degrees, and then the operators quickly start alternating operations. With this operation method, although the shutdown time is long, the quality can be greatly guaranteed.

[0006] In view of this, in order to reduce operation risks while ensuring operation quality and ensuring operation efficiency, a heating furnace and a slider welding method and device that improve the slider welding stability are urgently needed. Summary of the Invention

[0007] The objects of the present invention include, for example, providing a walking beam heating furnace and a maintenance method and equipment thereof, which can reduce operation risks while ensuring operation quality and ensure operation efficiency.

[0008] The embodiments of the present invention can be implemented as follows:

[0009] In the first aspect, the present invention provides a walking-type heating furnace, comprising a moving beam and a fixed beam, wherein the moving beam and the fixed beam both comprise a beam body, an arc-shaped positioning groove block is welded on the upper surface of the beam body, and the curvature of one side of the arc-shaped positioning groove block welded to the beam body is adapted to the curvature of the beam body surface, an installation groove is provided on the upper surface of the arc-shaped positioning groove block, a slider is welded in the installation groove, and the shape and size of the installation groove are adapted to the shape and size of the bottom surface of the slider.

[0010] In a second aspect, the present invention provides a method for maintaining a step-by-step heating furnace as described in the aforementioned embodiment, including slider welding: setting a chamfer of 45-60° on the bottom of the slider to be welded, stopping the heating furnace and using a slider mover to transfer the slider to the position to be welded, and using a welding tool assembly to fix the welding clamp. When the temperature difference between the slider and the arc-shaped positioning groove block to be welded is less than 20°C, the slider is welded into the installation groove of the arc-shaped positioning groove block using a welding clamp.

[0011] In an optional embodiment, the welding position is cooled before welding, and the cooling means include at least one of the following methods:

[0012] ①The gas pressure and oxygen pressure of the heating furnace are adjusted to negative pressure;

[0013] ② Remove the two cantilever rollers closest to the position where the slider is to be welded;

[0014] ③ Use low-temperature air outside the heating furnace to replace the high-temperature gas inside the heating furnace.

[0015] In an optional embodiment, at least one of the following steps is further included:

[0016] ① Before welding, lower the temperature in the heating furnace to 380-420℃, and the temperature of the movable beam or fixed beam corresponding to the slider to be welded should be 100-110℃;

[0017] ② Use compressed gas to purge the slider and / or the mounting groove to be welded before welding;

[0018] ③ During welding, symmetrical welding is adopted, A132 welding rod is used to weld the base layer, and A310 welding rod is used to weld the filling layer. The base layer is welded 1-3 times, and the filling layer is welded 6-8 times. The welding current is 105-120A, and the welding temperature is 280-320℃.

[0019] In a third aspect, the present invention provides a slider mover used in the walking beam furnace maintenance method according to the aforementioned embodiment, wherein the slider mover includes a support base, an adjuster, a balance bar, and a balance clamp;

[0020] The support seat is provided with a thread groove, the bottom of the adjuster is threadedly connected to the thread groove, the top of the adjuster is provided with a balance groove, the middle part of the balance rod is located in the balance groove and can rotate in a vertical plane with the balance groove as a fulcrum;

[0021] One end of the balance rod is provided with a balance clamp for clamping a slider, and the other end of the balance rod is provided with a manual operation part.

[0022] In an optional embodiment, a first mounting hole is provided at one end of the balance pole, a mounting ear is provided on the balance clamp, a second mounting hole is provided on the mounting ear, and a pin shaft passes through the first mounting hole and the second mounting hole in sequence to install the balance clamp on the balance pole.

[0023] In a fourth aspect, the present invention provides a welding tool assembly used in the method for maintaining a step-type heating furnace according to the aforementioned embodiment, wherein the welding tool assembly includes a vertical pole and a welding rod for fixing a welding clamp, a bearing seat is provided at the top end of the vertical pole, a bearing is provided in the bearing seat, the outer ring of the bearing is fixed to the bearing seat, a rotating rod is fixed to the inner ring of the bearing seat, and the welding rod is installed on the rotating rod.

[0024] In an optional embodiment, an adjusting piece is provided on the rotating rod, a tool seat is provided on the adjusting piece, an arc-shaped groove is provided in the middle of the tool seat, and the welding rod is provided in the arc-shaped groove.

[0025] In an optional embodiment, the adjustment member includes a first adjustment plate and a second adjustment plate arranged opposite to the first adjustment plate, and a pin shaft passes through the first adjustment plate, the rotating rod and the second adjustment plate in sequence to fix the first adjustment plate and the second adjustment plate to the rotating rod, the top ends of the first adjustment plate and the second adjustment plate are fixed to the tool holder, and the middle part of the welding rod is located above the rotating rod and can rotate in a vertical plane with the rotating rod as a fulcrum.

[0026] In an optional embodiment, the welding tool assembly further includes a base plate and a trolley, wherein the base plate is provided with a slide rail for moving the trolley, and the vertical pole is fixed on the trolley.

[0027] The beneficial effects of the embodiments of the present invention include, for example:

[0028] In order to improve the connection stability between the slider and the movable beam or fixed beam, an arc-shaped positioning groove block is welded on the beam body. The lower surface of the arc-shaped positioning groove block has the same curvature as the outer wall of the beam body and is tightly attached to the beam body to form an inner arc friction force. The slider is embedded in the middle of the arc-shaped positioning groove block and fixed by welding, thereby fixing the slider more firmly on the beam body.

[0029] In the heating furnace, since the arc-shaped positioning groove block is tightly connected to the fixed beam and the movable beam, and the beam bodies of the movable beam and the fixed beam are provided with water cooling, in comparison, the temperature of the slider is slightly lower than that of the arc-shaped positioning groove block, that is, the expansion of the arc-shaped positioning groove block is smaller than that of the slider, which is conducive to the slider being more firmly set in the arc-shaped positioning groove block under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a structural diagram of the heating furnace during normal operation;

[0032] Figure 2 This is a schematic diagram of the structure of the heating furnace during slider welding;

[0033] Figure 3 A structural diagram of the slider and beam from one perspective;

[0034] Figure 4 This is a structural diagram of the slider and beam from another perspective;

[0035] Figure 5 It is a structural diagram of the slider mover;

[0036] Figure 6 A structural diagram of a welding tool assembly from one perspective;

[0037] Figure 7 A structural diagram of the welding tool assembly from another perspective.

[0038] Icons: 100-walking heating furnace; 110-moving beam; 120-fixed beam; 130-cantilever roller; 140-beam body; 150-arc-shaped positioning groove block; 151-mounting groove; 160-slider; 170-water cooling device; 200-slider mover; 210-support seat; 220-adjuster; 230-balance rod; 240-balance clamp; 250-pin shaft; 300-welding tool assembly; 310-vertical pole; 320-welding rod; 330-bearing seat; 331-bearing; 340-rotating rod; 350-adjustment part; 351-first adjustment plate; 352-second adjustment plate; 360-tool seat; 370-base plate; 380-trolley; 390-slide rail; 400-fan. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0043] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0045] Please refer to Figures 1 to 4 This embodiment provides a walking-beam heating furnace 100, including a movable beam 110 and a fixed beam 120. The movable beam 110 and the fixed beam 120 both include a beam body 140. An arc-shaped positioning groove block 150 is welded on the upper surface of the beam body 140. The curvature of one side of the arc-shaped positioning groove block 150 welded to the beam body 140 is adapted to the curvature of the surface of the beam body 140. An installation groove 151 is provided on the upper surface of the arc-shaped positioning groove block 150. A slider 160 is welded in the installation groove 151. The shape and size of the installation groove 151 are adapted to the shape and size of the bottom surface of the slider 160.

[0046] In order to improve the connection stability between the slider 160 and the movable beam 110 or the fixed beam 120, an arc-shaped positioning groove block 150 is welded on the beam body 140. The lower surface of the arc-shaped positioning groove block 150 has the same curvature as the outer wall of the beam body 140 and is tightly attached to the beam body 140 to form an inner arc friction force. The slider 160 is embedded in the middle of the arc-shaped positioning groove block 150 and is fixed by welding, thereby fixing the slider 160 more firmly on the beam body 140.

[0047] In the heating furnace, since the arc-shaped positioning groove block 150 is tightly connected to the fixed beam 120 and the movable beam 110, and the beam body 140 of the movable beam 110 and the fixed beam 120 is provided with water cooling, in comparison, the temperature of the slider 160 is slightly lower than that of the arc-shaped positioning groove block 150, that is, the expansion of the arc-shaped positioning groove block 150 is smaller than that of the slider 160, which is conducive to the slider 160 being able to be more firmly set in the arc-shaped positioning groove block 150 under high temperature conditions.

[0048] The welding area of ​​the arc-shaped positioning groove block 150 in this embodiment can be wavy to increase the welding area and improve the strength of the welding fixation. In addition, an interference fit can be adopted between the slider 160 and the mounting groove 151. Specifically, the size of the mounting groove 151 can be slightly smaller than the slider 160, for example, the width is less than 0.005mm, so as to form a transition fit and improve the firmness of the fixation of the slider 160.

[0049] The walking beam heating furnace 100 in the prior art includes a moving beam 110, a fixed beam 120 and a cantilever roller 130, etc. It is a continuous heating furnace that moves the billet forward step by step by relying on the rising, forward, lowering and backward movements of the moving beam 110. The fixed beam 120 and the moving beam 110 are usually composed of water-cooling pipes or are provided with a water-cooling device 170. Other unmentioned structures of the walking beam heating furnace 100 provided in this embodiment can refer to the prior art.

[0050] This embodiment provides a maintenance method for the walking-beam heating furnace 100 described in the aforementioned embodiment, including slider welding: setting a 45-60° chamfer on the bottom of the slider 160 to be welded, stopping the heating furnace and using a slider mover 200 to move the slider 160 to the position to be welded, using a welding tool assembly 300 to fix the welding clamp, and when the temperature difference between the slider 160 and the arc-shaped positioning groove block 150 to be welded is less than 20°C, using a welding clamp to weld the slider 160 into the mounting groove 151 of the arc-shaped positioning groove block 150.

[0051] In this embodiment, a slider mover 200 is used to move the slider 160 to the welding position, and a welding tool assembly 300 is used to secure the welding clamp. This eliminates the need for personnel to enter the heating furnace during the slider 160 welding process, enabling remote operation and welding the slider 160 to the desired position. In this embodiment, a 45-60° chamfer is machined at the welding position of the slider 160. This not only facilitates welding and improves weld strength and quality, but also prevents the original welding position where the slider 160 could fall off in the heating furnace, thereby improving welding efficiency. After the slider 160 is spot-welded to the fixed beam 120 or movable beam 110, welding must begin only after the slider 160 and fixed beam 120 or movable beam 110 reach the same temperature. This prevents weld cracks caused by uneven temperatures.

[0052] Some preparation work needs to be done before welding, for example: more than two sliders 160 of the corresponding model need to be processed to avoid the sliders 160 falling off and being adjusted to the bottom of the heating furnace, waiting for re-processing, which affects the construction period. After the sliders 160 are processed, the operation is started in accordance with the production plan and about 6 hours of maintenance time is coordinated. The welding position is also cooled before welding. In an optional embodiment, the cooling method includes adjusting the gas pressure and oxygen pressure of the heating furnace to negative pressure, which can reduce unnecessary gas consumption, achieve faster cooling, and ensure operational safety: in a positive pressure state, the flame will float out of the heating furnace, and the negative pressure can control the fire in the heating furnace so that it will not float out and hurt people.

[0053] In an optional embodiment, the two cantilever rollers 130 closest to the position of the slider 160 to be welded are removed.

[0054] In an optional embodiment, low-temperature air outside the heating furnace is used to replace the high-temperature gas inside the heating furnace.

[0055] After removing the two cantilever rollers 130, a fan 400 can be installed at the furnace door position of the heating furnace, and another fan 400 can be added at the position where the slider 160 falls off, so that natural wind is blown into the heating furnace by the fan 400 to form a wind flow, thereby reducing the temperature of the working point, and the hot air is blown out from the furnace door at the other end. If there is no furnace door at the other end, it is blown out from the position of the second cantilever roller 130 that has been removed, so that the temperature in the heating furnace is replaced by the airflow to cool down; after the fan 400 blows for 1 hour, the temperature in the furnace can be reduced to about 400 degrees, and the temperature at the working point is only about 100 degrees at this time. Use tools to move the slider 160 smoothly to the repair position, and then you can start working.

[0056] In an optional embodiment, before welding, the temperature in the heating furnace is first lowered to 380-420° C., and the temperature of the movable beam 110 or the fixed beam 120 corresponding to the slider 160 to be welded is 100-110° C.

[0057] In this embodiment, the temperature of the fixed beam 120 and the movable beam 110 can also be adjusted by adjusting the cooling water flow of the water cooling device 170 corresponding to the movable beam 110 or the fixed beam 120. For example, the water inlet regulating valve is closed, and the temperature is detected by a temperature detector. When the temperature reaches about 100-110 degrees, the fixed beam 120 and the movable beam 110 expand by 0.10-0.15 mm, and the slider 160 can be smoothly placed. Then, the regulating valve is immediately fully opened to fix it, and then the slider 160 is welded to the positioning groove block.

[0058] In an optional embodiment, compressed gas is used to purge the slider 160 and / or the installation groove 151 at the welding position before welding to provide a clean and clear repair surface.

[0059] In an optional embodiment, symmetrical welding is adopted during welding, and an A132 electrode (Cr19Ni10Nb stainless steel electrode with a titanium calcium coating and Nb stabilizer) is used to weld the base layer, and an A310 electrode (such as an Electric Power brand A310 stainless steel electrode, etc.) is used to weld the filling layer. The base layer is welded in 1-3 passes, and the filling layer is welded in 6-8 passes. The welding machine current is 105-120A, and the welding temperature is 280-320°C.

[0060] Use tools to adjust the current externally. Use A132 as the base layer and A310 as the filling layer. Weld 1-3 layers of the base layer and 6-8 layers of the filling layer. Adjust the welding machine current to 105-120A, weld thin layers, and use symmetrical welding to gradually fix and strengthen the slider 160 and the movable beam 110 or the fixed beam 120. The welding temperature is controlled at around 300°. In addition to slowing down the welding speed and welding time, the temperature can also be controlled by increasing the cooling water flow of the movable beam 110 and the fixed beam 120 of the heating furnace to achieve temperature control.

[0061] This embodiment provides a slider mover 200 used in the welding method of the slider 160 of the walking beam heating furnace 100 according to the above embodiment. Figure 5 As shown, the slider mover 200 includes a support base 210, an adjuster 220, a balance rod 230 and a balance clamp 240;

[0062] The support base 210 is provided with a thread groove, the bottom of the adjuster 220 is threadedly connected to the thread groove, and the top of the adjuster 220 is provided with a balance groove, the middle of the balance rod 230 is located in the balance groove and can rotate in a vertical plane with the balance groove as a fulcrum;

[0063] A balancing clamp 240 for clamping the slider 160 is provided at one end of the balancing rod 230 , and a manual operation portion is provided at the other end of the balancing rod 230 .

[0064] In an optional embodiment, a first mounting hole is provided at one end of the balance pole 230, a mounting ear is provided on the balance clamp 240, a second mounting hole is provided on the mounting ear, and a pin shaft 250 passes through the first mounting hole and the second mounting hole in sequence to install the balance clamp 240 on the balance pole 230.

[0065] The balancing rod 230 is controlled by the operator at one end and provided with a pin 250 at the other end, and the pin 250 is connected to the balancing clamp 240. With the above technical solution, after the balancing clamp 240 clamps the slider 160, the balancing clamp 240 will brake and adjust according to the weight of the slider 160, so that the slider 160 is always in a straight state, which is convenient for the slider 160 to extend into the fixed beam 120 and the movable beam 110 on the heating furnace for positioning; the support serves as a support point, and the operator operates by holding one end of the balancing rod 230 to move the balancing rod 230 back and forth or rotate it up and down in the fixed groove, so that the slider 160 is moved to the working point, avoiding the operator from working close to the high temperature of the heating furnace; the bottom of the adjuster 220 is threadedly connected to the threaded groove, which can adjust the height of the fixed groove and thus adjust the height of the balancing rod 230 on the one hand, and can drive the balancing rod 230 to rotate on the horizontal plane on the other hand, thereby improving the flexibility of the slider mover 200.

[0066] This embodiment provides a welding tool assembly 300 used in the welding method of the slider 160 of the walking beam furnace 100 according to the above embodiment. Figure 6-7 As shown, the welding tool assembly 300 includes a vertical pole 310 and a welding rod 320 for fixing the welding clamp. A bearing seat 330 is provided at the top of the vertical pole 310. A bearing 331 is provided in the bearing seat 330. The outer ring of the bearing 331 is fixed to the bearing seat 330. A rotating rod 340 is fixed to the inner ring of the bearing seat 330. The welding rod 320 is installed on the rotating rod 340.

[0067] In this embodiment, the welding rod 320 is indirectly mounted on the vertical pole 310 by the cooperation of the bearing seat 330 and the bearing 331, so that the welding rod 320 can rotate along the vertical pole 310, providing conditions for the operator to weld and rotate, and reducing the difficulty of welding in the furnace.

[0068] The bearing 331 and the bearing seat 330 in this embodiment can adopt an interference fit. The welding rod 320 is made of an insulating and high-temperature resistant material, such as silicon carbide, silicon nitride, aluminum oxide, and fluororubber. It is hollow in the middle for the welding wire to pass through to achieve insulation. A welding clamp is installed at the other end of the welding rod 320, and the welding rod is clamped on the welding clamp to achieve long-distance welding.

[0069] In an optional embodiment, the rotating rod 340 is provided with an adjustment member 350, which is equipped with a tool holder 360. An arcuate slot is provided in the center of the tool holder 360, and the welding rod 320 is positioned within the arcuate slot, thereby improving the stability of the connection of the welding rod 320. In an optional embodiment, the adjustment member 350 includes a first adjustment plate 351 and a second adjustment plate 352 disposed opposite the first adjustment plate 351. A pin 250 passes through the first adjustment plate 351, the rotating rod 340, and the second adjustment plate 352, securing the first and second adjustment plates 351, 352 to the rotating rod 340. The top ends of the first and second adjustment plates 351, 352 are secured to the tool holder 360. The center of the welding rod 320 is located above the rotating rod 340 and can rotate in a vertical plane with the rotating rod 340 as a fulcrum. In this embodiment, the welding rod 320 moves up and down in a seesaw-like manner, providing a convenient way for the operator to move up and down.

[0070] In an optional embodiment, the welding tool assembly 300 further includes a base plate 370 and a trolley 380. The base plate 370 is provided with a slide rail 390 for moving the trolley 380, and the upright pole 310 is fixed to the trolley 380. The trolley 380 can move smoothly laterally, providing lateral movement conditions for the operator to move during welding, making welding more operable and possible.

[0071] By adopting the above technical solution, the operator can operate one end of the welding rod 320 to move the welding clamp up and down, left and right, and forward and backward, which is conducive to long-distance welding.

[0072] The foregoing description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein are intended to be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for maintaining a walking beam furnace, characterized in that: The walking beam heating furnace includes a moving beam and a fixed beam, characterized in that the moving beam and the fixed beam both include a beam body, an arc-shaped positioning groove block is welded to the upper surface of the beam body, the curvature of the arc-shaped positioning groove block on the side welded to the beam body is adapted to the curvature of the beam body surface, a mounting groove is provided on the upper surface of the arc-shaped positioning groove block, a slider is welded in the mounting groove, and the shape and size of the mounting groove are adapted to the shape and size of the bottom surface of the slider; The repair method includes slider welding: setting a 45-60° chamfer on the bottom of the slider to be welded, stopping the heating furnace and using a slider mover to move the slider to the welding position, using a welding tool assembly to fix the welding clamp, and when the temperature difference between the slider and the arc-shaped positioning groove block to be welded is less than 20°C, using the welding clamp to weld the slider into the installation groove of the arc-shaped positioning groove block; The welding position is also cooled before welding. The cooling method includes the following steps: ①The gas pressure and oxygen pressure of the heating furnace are adjusted to negative pressure; ② Remove the two cantilever rollers closest to the position where the slider is to be welded; ③ Use low-temperature air outside the heating furnace to replace the high-temperature gas inside the heating furnace.

2. The maintenance method of a walking beam furnace according to claim 1, characterized in that: The following steps are also included: ① Before welding, lower the temperature in the heating furnace to 380-420℃, and the temperature of the movable beam or fixed beam corresponding to the slider to be welded should be 100-110℃; ② Use compressed gas to purge the slider and / or the mounting groove to be welded before welding; ③ During welding, symmetrical welding is adopted, A132 welding rod is used to weld the base layer, and A310 welding rod is used to weld the filling layer. The base layer is welded 1-3 times, and the filling layer is welded 6-8 times. The welding current is 105-120A, and the welding temperature is 280-320℃.

3. The maintenance method of a walking beam furnace according to claim 1, characterized in that: The slider mover includes a support base, an adjuster, a balance rod and a balance clamp; The support seat is provided with a thread groove, the bottom of the adjuster is threadedly connected to the thread groove, the top of the adjuster is provided with a balance groove, the middle part of the balance rod is located in the balance groove and can rotate in a vertical plane with the balance groove as a fulcrum; One end of the balance rod is provided with a balance clamp for clamping a slider, and the other end of the balance rod is provided with a manual operation part.

4. The maintenance method of a walking beam furnace according to claim 3, characterized in that: A first mounting hole is provided at one end of the balance pole, a mounting ear is provided on the balance clamp, a second mounting hole is provided on the mounting ear, and a pin shaft passes through the first mounting hole and the second mounting hole in sequence to mount the balance clamp on the balance pole.

5. A method for maintaining a walking beam furnace according to claim 1, characterized in that: The welding tool assembly includes a vertical pole and a welding rod for fixing the welding clamp. A bearing seat is provided at the top of the vertical pole, a bearing is provided in the bearing seat, the outer ring of the bearing is fixed to the bearing seat, a rotating rod is fixed to the inner ring of the bearing seat, and the welding rod is installed on the rotating rod.

6. The maintenance method of a walking beam furnace according to claim 5, characterized in that: The rotating rod is provided with an adjusting piece, the adjusting piece is provided with a tool seat, an arc groove is provided in the middle of the tool seat, and the welding rod is provided in the arc groove.

7. The maintenance method of a walking beam furnace according to claim 6, characterized in that: The adjusting member includes a first adjusting plate and a second adjusting plate arranged opposite to the first adjusting plate, and a pin shaft passes through the first adjusting plate, the rotating rod and the second adjusting plate in sequence to fix the first adjusting plate and the second adjusting plate to the rotating rod, and the top ends of the first adjusting plate and the second adjusting plate are fixed to the tool holder, and the middle part of the welding rod is located above the rotating rod and can rotate in a vertical plane with the rotating rod as a fulcrum.

8. The maintenance method of a walking beam furnace according to claim 5, characterized in that: The welding tool assembly further comprises a base plate and a trolley. The base plate is provided with a slide rail for the movement of the trolley, and the vertical pole is fixed on the trolley.

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