Leveling machine applied to recycled steel plates

Abstract

The invention relates to the technical field of steel plate leveling, and discloses a leveler applied to recycled steel plates. Through mutual cooperation of the detection air exhaust assembly and the flaming assembly, the position where the bending amplitude of the to-be-leveled steel plate exceeds the limit can be detected, and flaming softening is conducted on the position, so that the position is not prone to generating cracks due to stress concentration and large brittleness in the follow-up leveling process of the rolling machine tool. Before flaming softening, the mounting table lifting rod and the roller assembly are pulled out of the strip-shaped hole, and the strip-shaped hole is sealed and covered by the synchronous moving plate, so that on one hand, redundant driving structures are reduced, the cost is reduced, and on the other hand, two operations are carried out simultaneously and are in a forced opening state; the problem that the detection air exhaust assembly is damaged by high temperature due to the fact that the movable plate does not seal the strip-shaped hole in time can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of steel plate leveling, and in particular to a leveling machine used for recycling steel plates. Background Art

[0002] Since recycled steel plates have different degrees of plastic deformation such as bending, curvature, wave shape, sickle and twist, the most important thing in the recycling stage is to level them. The qualification of leveling directly affects the application direction of the recycled steel plates in the later secondary utilization.

[0003] The leveling machine is a type of leveling device. Its principle is to achieve the leveling of the workpiece after the workpiece is alternately bent and extruded between the upper and lower rollers that are driven separately. At present, it is found in the process of use that recycled steel plates, especially some brittle steel plates with high carbon content, are very easy to crack at the place where the bending arc is large during the leveling process. After research, it is found that the reason for the cracks is that when the steel plate is bent and extruded by the upper and lower rollers during the leveling process, if the bending amplitude of this point is opposite to the direction of the bending by the upper and lower rollers, this point will produce a large bend in the opposite direction. The bending amplitude is the superposition of the original bending amplitude of the steel plate and the bending amplitude set at the upper and lower rollers. This also causes cracks at the place where the original bending amplitude of the recycled steel plate is the largest due to stress concentration. There is no effective solution in the existing technology. Summary of the invention

[0004] In view of the above problems, an embodiment of the present application provides a leveling machine for recycled steel plates, which can effectively avoid problems such as cracking of the recycled steel plates during the subsequent leveling process due to excessive bending.

[0005] According to one aspect of the embodiment of the present application, a leveling machine for recycling steel plates is provided. The leveling machine for recycling steel plates includes a roller press and a preheating machine arranged in sequence along a first axial direction, the roller press includes a base, a conveying motor, and a plurality of upper and lower pressure rollers corresponding to each other, a gap is provided between the upper and lower pressure rollers, a plurality of the lower pressure rollers are arranged on the base, and a plurality of the upper pressure rollers are connected to the base through a lifting assembly, the preheating machine includes a square conveying cylinder, the inner bottom wall height of the square conveying cylinder is consistent with the vertex height of the lower pressure roller, two pressing assemblies are provided on the top of the square conveying cylinder, and a detection and exhaust assembly and a flame spraying assembly are sequentially arranged between the two pressing assemblies in a direction close to the roller press, the detection and exhaust assembly includes a strip hole penetrating the top of the square conveying cylinder and two slide grooves symmetrically arranged on both sides of the strip hole, the slide groove extends along the first axial direction, and the strip groove extends along the second axial direction. The cam is an angular channel that is fixedly provided with a plurality of toothed plates, each of which is connected to a pair of toothed plates at two ends thereof. The cam is provided with a plurality of toothed plates at two ends thereof. The plurality of toothed plates are connected to the pair of toothed plates at two ends thereof.

[0006] The touch-twist switch, the servo motor, the flame-spraying assembly and the conveying motor are all electrically connected to the PLC control box.

[0007] In some embodiments, the flame spray assembly includes a plurality of flame spray tubes, the flame spray ends of the flame spray tubes extend to the inner cavity of the square conveying tube and the lower direction of the flame spray tubes is inclined toward the direction of the detection and exhaust assembly.

[0008] In some embodiments, the upper ends of the flamethrowers are connected to a buffer tube, and the buffer tube is connected to a gas storage device through a pipeline.

[0009] In some embodiments, a regulating valve is provided between the flamethrower and the buffer tube, the regulating valve is electrically connected to the PLC control box, and the number of the flamethrowers is the same as that of the touch-twist switches and they correspond to each other.

[0010] In some embodiments, a momentum delay spring is disposed in the middle of the lifting rod.

[0011] In some embodiments, an ignition hood is connected to one end of the movable plate close to the flame spray assembly, the ignition hood matches the strip hole, the ignition hood is connected to an air duct, and the other end of the air duct extends to the outside of the preheating machine and then bends upward.

[0012] In some embodiments, the air duct is fixed to the top of the movable plate by a plurality of fasteners.

[0013] In some embodiments, the pressing assembly includes a lifting platform, the lifting platform is connected to a support platform, a plurality of pressing springs are arranged at the bottom of the support platform, and a pressing roller is connected to the bottom of the pressing springs.

[0014] The beneficial effects of the present application are as follows: 1. By setting the detection and exhaust assembly and the flame spray assembly to cooperate with each other, it is possible to detect the position where the bending amplitude of the steel plate to be leveled exceeds the limit and perform flame spraying to soften the position, thereby making it less likely for the position to crack due to stress concentration and high brittleness during the subsequent leveling process by the roller press. 2. In the present application, before flame spraying and softening, the installation platform lifting rod and the roller assembly will be pulled out of the strip hole, and the synchronous moving plate will cover the strip hole, thereby avoiding high-temperature damage to the detection and exhaust assembly during the flame spraying process, and the operation of the installation platform lifting rod and the roller assembly pulling out the strip hole and the operation of the moving plate covering the strip hole are driven by the driving gear and the servo motor at the same time, which reduces the redundant driving structure and reduces the cost on the one hand, and on the other hand, the two operations are performed simultaneously and are in a forced open state to each other, which can avoid the problem that the moving plate fails to cover the strip hole in time and causes the detection and exhaust assembly to be damaged by high temperature. 3. In this application, a mechanical method combining a rotating rod, a twist switch and a roller assembly is used to detect the bending amplitude of the steel plate to be leveled, which has the advantages of low failure rate, accurate measurement value and intuitive operation. The above description is only an overview of the technical solution of this application. In order to more clearly understand the technical means of this application, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of this application more obvious and easy to understand, the specific implementation methods of this application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0016] Figure 1 A schematic diagram of the overall structure of the device provided in the embodiment of the present application;

[0017] Figure 2 A schematic diagram of the local structure of the preheating machine provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the partial structure of a square conveying cylinder and a detection and exhaust assembly provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the local structure of a square conveying cylinder provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of the local structure of a U-shaped support plate provided in an embodiment of the present application;

[0021] Figure 6 A schematic diagram of the local structure of the movable plate and its connection provided in an embodiment of the present application.

[0022] The reference numerals in the specific implementation manner are as follows:

[0023] A leveling machine 100 for recycling steel plates, a roller press machine 110, a base 111, an upper pressing roller 112, a lower pressing roller 113, a preheating machine 120, a square conveying cylinder 121, a pressing component 122, a lifting platform 122a, a supporting platform 122b, a pressing spring 122c, a pressing roller 122d, a detection and exhaust component 123, a strip hole 123a, a slide 123b, a U-shaped support plate 123c, and a driving gear 123d. Rotating rod 123e, mounting platform 123f, sleeve 123g, lifting rod 123h, roller assembly 123i, touch-twist switch 123j, moving plate 123k, gear plate 123m, slide rail 123n, driven gear 123p, momentum delay spring 123q, ignition cover 123r, air duct 123s, snap-fit ​​123t, flamethrower assembly 124, flamethrower 124a, buffer tube 124b, regulating valve 124c. DETAILED DESCRIPTION

[0024] The following will describe in detail the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and cannot be used to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned description of the drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0025] Specifically, please refer to Figure 1 And to 6, Figure 1This is a schematic diagram of the overall structure of the device provided in the embodiment of the present application. Figure 2 A schematic diagram of the local structure of the preheating machine tool provided in an embodiment of the present application, Figure 3 This is a partial structural diagram of a square conveying cylinder and a detection and exhaust assembly provided in an embodiment of the present application. Figure 4 This is a schematic diagram of the partial structure of the square conveying cylinder provided in the embodiment of the present application. Figure 5 A schematic diagram of a partial structure of a U-shaped support plate provided in an embodiment of the present application, Figure 6The schematic diagram of the local structure of the movable plate and its connection provided in the embodiment of the present application. The leveling machine 100 applied to recycled steel plates comprises a roller press machine 110 and a preheating machine 120 arranged in sequence along a first axial direction, and the roller press machine 110 is used to flatten the recycled steel plates after extrusion and bending. The roller press 110 includes a base 111, a conveying motor, and a plurality of upper rollers 112 and lower rollers 113 corresponding to each other. There is a gap between the upper rollers 112 and the lower rollers 113. The plurality of lower rollers 113 are arranged on the base 111. The upper rollers 112 are connected to the base 111 through a lifting assembly. During operation, the distance between the upper rollers 112 and the lower rollers 113 is adjusted according to the thickness of the steel plate to be leveled, and the steel plate to be leveled is sent between the upper and lower rollers 113 after passing through the preheating machine 120. The conveying motor drives the upper and lower rollers 113 to rotate to complete the leveling of the steel plate. The leveling process can be carried out in a linear decreasing manner, that is, the bending amount from the second roller to the last second roller is linearly decreased. The roller press 110 can be set with reference to the prior art, as long as it meets the use requirements, and will not be described in detail here. The preheating machine 120 includes a square conveyor cylinder 121. The inner bottom wall height of the square conveyor cylinder 121 is consistent with the top height of the lower pressing roller 113. The square conveyor cylinder 121 supports the steel plate to be leveled. The steel plate to be leveled will pass through the square support cylinder and enter the roller press machine 110. In order to extend the life of the equipment, the square conveyor cylinder 121 should be made of high temperature resistant materials. Two pressing components 122 are provided on the top of the square conveyor cylinder 121. The pressing components 122 are used to squeeze the steel plate to be leveled so that it is close to the inner bottom wall of the square conveyor cylinder 121 when passing through the square conveyor cylinder 121. A detection exhaust component 123 and a flame spray component 124 are sequentially arranged between the two pressing components 122 in the direction close to the roller press machine 110. The detection exhaust component 123 is used to detect the bending amplitude of the steel plate to be leveled and guide the hot air flow out. The flame spray component 124 is used to perform flame spraying to soften the part of the steel plate to be leveled with a large bending amplitude. The detection and exhaust assembly 123 includes a strip hole 123a that runs through the top of the square conveying cylinder 121 and two slide grooves 123b that are symmetrically arranged on both sides of the strip hole 123a. The slide groove 123b extends along the first axial direction, and the strip groove extends along the second axial direction. The first axial direction and the second axial direction are perpendicular to each other. The strip hole 123a allows the roller assembly 123i and the lifting rod 123h to extend into the interior of the square conveying cylinder 121. The slide groove 123b is used to limit the slide rail 123n, so that the moving plate 123k can move stably. An inverted U-shaped support plate 123c is arranged on one side of the top of the square hole. The U-shaped support plate 123c is used to install components such as the driving gear 123d. The U-shaped support plate 123c and the square conveying cylinder 121 can be an integrated structure.Both ends of the U-shaped support plate 123c are rotatably connected to a driving gear 123d, and the driving gear 123d is coaxially connected to a servo motor, which can drive the driving gear 123d to rotate. One end of the driving gear 123d is fixedly connected to a rotating rod 123e, and a mounting platform 123f is commonly connected between the two rotating rods 123e. When the driving gear 123d is driven, it will drive the rotating rod 123e to rotate, and then the rotating rod 123e will drive the mounting platform 123f to rotate. In this process, the mounting platform 123f can be extended into the square conveying cylinder 121 along the strip hole 123a or pulled out of the square conveying cylinder 121. A plurality of sleeves 123g are sequentially arranged on the mounting platform 123f along the second axial direction, and a lifting rod 123h is arranged inside the sleeve 123g. The lifting rod 123h can slide up and down inside the sleeve 123g. In order to prevent the lifting rod 123h from completely sliding out of the sleeve 123g under the action of gravity, a boss can be arranged at the top of the lifting rod 123h, so that the radius of the boss is larger than the inner diameter of the sleeve 123g. One end of the lifting rod 123h penetrates downward to the bottom of the mounting platform 123f and is connected to a roller assembly 123i. A touch-twist switch 123j is fixed above the lifting rod 123h on the mounting platform 123f. When the steel plate to be leveled slides inside the square conveying cylinder 121, the roller assembly 123i will roll relatively on the top of the steel plate to be leveled. When the upward bending amplitude of the steel plate to be tested is too large, the top of the steel plate to be tested will lift the roller assembly 123i, and then the roller assembly 123i drives the lifting rod 123 h is lifted, and the lifting rod 123h will trigger the twist switch 123j after it is lifted to the predetermined range. The interval between the twist switch 123j and the lifting rod 123h should be set according to the maximum allowable bending amplitude of the steel plate to be leveled. For example, when the maximum allowable bending amount of the steel plate to be leveled is 8mm, the bottom of the roller assembly 123i can be controlled to be close to the inner bottom wall of the square conveying cylinder 121. In this state, the distance between the lifting rod 123h and the twist switch 123j can be adjusted to be equal to 8mm + the thickness of the steel plate to be leveled. A movable plate 123k is arranged below the U-shaped supporting plate 123c, and tooth plates 123m are connected to both sides of the movable plate 123k respectively. A slide rail 123n extending into the slide groove 123b is arranged below the tooth plate 123m. The driving gear 123d is connected to the driven gear 123p through a changing gear, and the driven gear 123p is meshed with the tooth plate 123m. When the driving gear 123d drives the rotating rod 123e to rotate, the driving gear 123d will synchronously drive the driven gear 123p to rotate through the changing gear, and then the driven gear 123p drives the movable plate 123k to slide along the slide groove 123b through the tooth plate 123m, thereby realizing the operation of covering the strip hole 123a or realizing the operation of moving the movable plate 123k away from the strip hole 123a. The touch-twist switch 123j, the servo motor, the flame-spraying assembly 124 and the conveying motor are all electrically connected to the PLC control box.

[0026] In the specific working process of the embodiment of the present application, when the steel plate to be leveled moves too much in the square conveyor cylinder 121, the roller assembly 123i rolls on the top of the steel plate to be leveled and rises and falls along with the bending waveform of the steel plate to be leveled. When the bending amplitude of the steel plate to be leveled exceeds the threshold, the roller assembly 123i will drive the lifting rod 123h to further rise and then trigger the twist switch 123j. The twist switch 123j transmits an electrical signal to the PLC control box. Further, the PLC control box controls the conveying motor to stop and turns on the conveying motor. The servo motor drives the mounting platform 123f, the lifting rod 123h and the roller assembly 123i to be withdrawn along the strip hole 123a through the driving gear 123d. Synchronously, the moving plate 123k will approach the strip hole 123a and finally stop above the strip hole 123a under the drive of the driven gear 123p. Subsequently, the PLC control box further controls the flame spraying assembly 124 to spray flame to soften the flattened steel plate. After a period of time, the servo motor reverses and the components are reset.

[0027] As can be seen from the above, in the embodiment of the present application, 1. by setting up the detection exhaust component 123 and the flame spraying component 124 to cooperate with each other, it is possible to detect the position where the bending amplitude of the steel plate to be leveled exceeds the limit and perform flame spraying to soften the position, thereby making it less likely for this part to crack due to stress concentration and high brittleness during the subsequent leveling process through the roller press 110. 2. In the present application, before flame softening, the installation platform 123f lifting rod 123h and roller assembly 123i will be pulled out of the strip hole 123a, and the moving plate 123k will synchronously cover the strip hole 123a, thereby avoiding high-temperature damage to the detection and exhaust assembly 123 during the flame spraying process. The operation of the installation platform 123f lifting rod 123h and roller assembly 123i pulling out the strip hole 123a and the operation of the moving plate 123k covering the strip hole 123a are driven by the driving gear 123d and the servo motor at the same time. On the one hand, it reduces the redundant driving structure and reduces the cost. On the other hand, it makes the two operations proceed at the same time and are in a forced open state with each other, which can avoid the problem that the moving plate 123k fails to cover the strip hole 123a in time, causing the detection and exhaust assembly 123 to be damaged by high temperature. 3. In the present application, when detecting the bending amplitude of the steel plate to be leveled, a mechanical method combining a rotating rod 123e, a twist switch 123j and a roller assembly 123i is adopted, which has the advantages of low failure rate, accurate measurement value and intuitive operation.

[0028] In some embodiments, the flame spray assembly 124 includes a plurality of flame spray tubes 124a, the flame spray ends of the flame spray tubes 124a extend to the inner cavity of the square conveying tube 121, and the lower direction of the flame spray tubes 124a is tilted toward the direction of the detection and exhaust assembly 123. In the embodiment of the present application, since the flame spray assembly 124 is in front of the detection and exhaust assembly 123, by tilting the flame spray tubes 124a, the flame sprayed by the flame spray tubes 124a can more accurately act on the corresponding position of the steel plate to be leveled, thereby improving energy efficiency.

[0029] In some embodiments, the upper ends of the flamethrowers 124a are connected to a flame buffer pipe 124b, and the flame buffer pipe 124b is connected to a gas storage device through a pipeline. In the embodiment of the present application, the gas storage device can be a natural gas pipeline or a gas bottle, etc. The combustible gas enters each flamethrower 124a through the flame buffer pipe 124b, and is ignited by the flamethrower 124a and then burns to generate a high-temperature flame to soften the steel plate to be leveled.

[0030] In some embodiments, a regulating valve 124c is provided between the flamethrower 124a and the spray buffer pipe 124b, and the regulating valve 124c is electrically connected to the PLC control box. The number of flamethrowers 124a and the touch-twist switches 123j are consistent and correspond to each other. In the embodiment of the present application, through the above-mentioned setting, the PLC control box can further control the gas flow in each flamethrower 124a by controlling the regulating valve 124c. Since the steel plate to be tested may have different heights and protrusions in the second axial direction (i.e., the width direction of the steel plate), through the above-mentioned setting, when one of the touch-twist switches 123j is triggered, the PLC control box controls the regulating valve 124c at the corresponding flamethrower 124a to increase the gas flow, and further soften the point of the steel plate to be leveled. The gas flow of the remaining flamethrowers 124a remains unchanged and only maintains the combustion state, thereby more accurately performing fixed-point softening on the steel plate to be leveled and saving gas consumption.

[0031] In some embodiments, a momentum slow-stroke spring 123q is disposed in the middle of the lifting rod 123h. In the embodiment of the present application, through the above arrangement, when the wave-shaped bending of the steel plate to be leveled exceeds the threshold value and further increases, the lifting rod 123h will push upward against the torsion switch 123j, and the momentum slow-stroke spring 123q will be further compressed, and the lifting rod 123h will not continue to lift, thereby allowing the detection and exhaust assembly 123 to maintain a relatively stable state.

[0032] In some embodiments, the end of the movable plate 123k close to the flame spraying assembly 124 is connected with a ignition cover 123r, the ignition cover 123r matches the strip hole 123a, and the ignition cover 123r is connected with an air duct 123s, and the other end of the air duct 123s extends to the outside of the preheating machine 120 and then bends upward. In the embodiment of the present application, through the above arrangement, when the movable plate 123k is close to the strip hole 123a, the ignition cover 123r will move to the strip hole 123a driven by the movable plate 123k and finally stop at the top of the strip hole 123a for sealing, and an air duct component can be set at the air duct 123s, and the air duct 123s drives the air flow to rise and circulate quickly, thereby increasing the combustion temperature in the square conveying cylinder 121.

[0033] In some embodiments, the air duct 123s is fixed to the top of the movable plate 123k by a plurality of fasteners 123t. In the embodiment of the present application, the fasteners 123t are provided to facilitate the stable fixing of the air duct 123s to the top of the movable plate 123k.

[0034] In some embodiments, the pressing assembly 122 includes a lifting platform 122a, the lifting platform 122a is connected to a support platform 122b, a plurality of pressing springs 122c are arranged at the bottom of the support platform 122b, and a pressing roller 122d is connected to the bottom of the pressing spring 122c. In the embodiment of the present application, when the steel plate to be leveled moves in the square conveying cylinder 121, the pressing spring 122c squeezes the pressing roller 122d, so that the pressing roller 122d acts downward on the steel plate to be leveled, which ensures the stability of the steel plate to be leveled when it moves inside the square conveying cylinder 121 to a certain extent.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A leveling machine for recycling steel plates, characterized in that: It includes a roller press machine and a preheating machine tool which are sequentially arranged along a first axial direction; The roller press machine comprises a base, a conveying motor, and a plurality of upper and lower rollers corresponding to each other, wherein a gap is provided between the upper and lower rollers, the plurality of lower rollers are arranged on the base, and the plurality of upper rollers are connected to the base via a lifting assembly; The preheating machine tool comprises a square conveying cylinder, the inner bottom wall height of the square conveying cylinder is consistent with the top height of the lower pressing roller, two pressing components are arranged on the top of the square conveying cylinder, and a detection exhaust component and a flame spraying component are arranged in sequence between the two pressing components in the direction close to the roller pressing machine tool; The detection and exhaust assembly includes a strip hole passing through the top of the square conveying cylinder and two slide grooves symmetrically arranged on both sides of the strip hole, the slide groove extends along the first axial direction, the strip groove extends along the second axial direction, the first axial direction and the second axial direction are perpendicular to each other, an inverted U-shaped support plate is arranged on one side of the top of the square hole, and two ends of the U-shaped support plate are rotatably connected to a driving gear, the driving gear is coaxially connected to a servo motor, one end of the driving gear is fixedly connected to a rotating rod, and a mounting platform is commonly connected between the two rotating rods, and a plurality of sleeves are sequentially arranged on the mounting platform along the second axial direction, and a lifting rod is arranged in the sleeve, one end of the lifting rod penetrates downward to the bottom of the mounting platform and is connected to a roller assembly, and a touch-twist switch is fixed on the mounting platform above the lifting rod, and a moving plate is arranged below the U-shaped support plate, and tooth plates are connected to the two sides of the moving plate, respectively, and a slide rail extending into the slide groove is arranged below the tooth plate, and the driving gear is connected to a driven gear through a changing gear, and the driven gear is meshed with the tooth plate; The touch-twist switch, the servo motor, the flame-spraying assembly and the conveying motor are all electrically connected to the PLC control box.

2. The leveling machine for recycling steel plates according to claim 1, characterized in that: The flame spraying assembly comprises a plurality of flame spraying tubes, the flame spraying ends of the flame spraying tubes extend to the inner cavity of the square conveying tube and the lower direction of the flame spraying tubes is inclined towards the direction of the detection and exhaust assembly.

3. The leveling machine for recycling steel plates according to claim 2, characterized in that: The upper ends of the flamethrowers are commonly connected with a buffer tube, and the buffer tube is connected with a gas storage device through a pipeline.

4. The leveling machine for recycling steel plates according to claim 3, characterized in that: A regulating valve is provided between the flamethrower and the buffer tube, and the regulating valve is electrically connected to the PLC control box. The number of the flamethrowers is consistent with that of the touch-twist switches and they correspond to each other.

5. The leveling machine for recycling steel plates according to claim 1, characterized in that: A momentum slow-travel spring is arranged in the middle of the lifting rod.

6. The leveling machine for recycling steel plates according to claim 1, characterized in that: One end of the movable plate close to the flame spray assembly is connected with an ignition cover, the ignition cover matches the strip hole, the ignition cover is connected with an air duct, and the other end of the air duct extends to the outside of the preheating machine and then bends upward.

7. The leveling machine for recycling steel plates according to claim 6, characterized in that: The air duct is fixed to the top of the movable plate through a plurality of fasteners.

8. The leveling machine for recycling steel plates according to claim 1, characterized in that: The pressing assembly comprises a lifting platform, the lifting platform is connected to a supporting platform, a plurality of pressing springs are arranged at the bottom of the supporting platform, and a pressing roller is connected to the bottom of the pressing springs.

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