Strip steel coiling system, high-strength steel coiling method and high-strength steel production line

Abstract

The present invention relates to a strip steel coiling system, a high-strength steel coiling method based on the strip steel coiling system, and a high-strength steel production line using the strip steel coiling system. The coiling system includes a coiler, a steering pinch roller, and a coil unloading car. The steering pinch roller is connected to the coiler through a strip threading guide plate. A bending machine is provided on the material-incoming side of the steering pinch roller. At least one auxiliary pressure roller is arranged around the reel of the coiler. The axial direction of the auxiliary pressure roller is parallel to the axial direction of the reel. The auxiliary pressure roller is provided with an auxiliary pressure roller driving unit so as to have a working position in rolling contact with the steel coil and a standby position away from the steel coil. The bending machine can straighten the strip steel in the early stage of coiling to avoid damaging the strip threading guide plate, and plastically deform the strip steel at the end of coiling, so as to provide back tension for coiling and reduce the rebound force of the outer ring strip steel; the auxiliary pressure roller can make the strip steel adhere to the reel / steel coil during coiling, improve the coiling effect of the strip steel, and avoid problems such as bulging near the jaws when coiling high-strength steel and other steel types.

Description

Technical Field

[0001] The invention relates to a strip steel coiling system, a high-strength steel coiling method based on the strip steel coiling system, and a high-strength steel production line using the strip steel coiling system. Background Art

[0002] The high-strength steel market is gradually expanding. In order to increase equipment capacity, high-strength strip steel has gradually expanded from single-sheet production to continuous production. In order to adapt to flexible and changeable production methods, high-strength strip steel coiling has become a difficult point. The main problems are as follows:

[0003] 1) Since high-strength steel is difficult to bend, tilting or lowering the head will cause great damage to the threading guide, especially when entering the jaws, it is difficult to enter automatically;

[0004] 2) When the jaws clamp the strip and start to coil, since full tension cannot be established, generally only 50% tension can be used for coiling. At this time, it is difficult for high-strength steel to adhere to the reel, especially a bulge will appear near the jaws, which will cause the steel coil to become a convex circle instead of a perfect circle, resulting in reduced tension control accuracy during coiling;

[0005] 3) When the last coil is taken up, the tail of the strip loses its tension due to the cutting of the tail, and the high-strength rebound will cause the last few coils to loosen;

[0006] 4) When the coiling is completed and the coil is unloaded, the high-strength steel has a strong rebound force. When the jaws are opened, the strip steel rebounds and gets stuck in the jaws, making it difficult to unload the coil;

[0007] 5) The rebound force of the last circle of the steel coil is very large, especially for thick plate high-strength steel, which makes it very difficult to bundle the strip steel. Even if the bundling is completed, the strapping belt can be easily cut off during the lifting and transportation process, resulting in loose coils and the risk of accidents. Summary of the invention

[0008] The present invention relates to a strip steel coiling system, a high-strength steel coiling method based on the strip steel coiling system and a high-strength steel production line using the strip steel coiling system, which can at least solve some defects of the prior art.

[0009] The present invention relates to a strip steel coiling system, comprising a coiler, a steering pinch roller and a coil unloading car, wherein the steering pinch roller is connected to the coiler through a strip threading guide plate, a bending machine is provided on the material incoming side of the steering pinch roller, at least one auxiliary pressure roller is arranged around the reel of the coiler, the axial direction of the auxiliary pressure roller is parallel to the axial direction of the reel, and the auxiliary pressure roller is configured with an auxiliary pressure roller driving unit so as to have a working position in rolling contact with the steel coil and a standby position away from the steel coil.

[0010] As one of the implementation modes, there are multiple auxiliary pressing rollers and they are arranged in sequence along the circumference of the reel.

[0011] As one of the implementation modes, the working positions of the auxiliary pressing rollers are distributed between 6 o'clock and 12 o'clock positions of the steel coil.

[0012] As one of the embodiments, the coil unloading vehicle is provided with a roller suitable for rolling contact with the steel coil. When the roller is in contact with the steel coil and each of the auxiliary pressure rollers is in a working position, the roller and each of the auxiliary pressure rollers are combined to form an auxiliary coiling roller group.

[0013] As one of the implementation modes, the working position of one of the auxiliary pressing rollers is located near the initial position of the nip of the roll.

[0014] As one of the implementation modes, the strip threading guide plate includes an upper guide plate and a lower guide plate respectively arranged on the upper and lower sides of the strip steel design wire, and the upper guide plate and the lower guide plate are respectively connected to a guide plate driving unit.

[0015] As one of the implementation modes, a guide roller is provided at the end of the upper guide plate.

[0016] As one of the implementation modes, the upper guide plate and the lower guide plate are both telescopic guide plates.

[0017] The present invention also relates to a high-strength steel coiling method, which uses the strip steel coiling system as described above to coil the high-strength strip steel, and the method comprises:

[0018] a. In the early stage of coiling, the strip is straightened by the bending machine, and the strip is guided to the reel by the steering pinch roller and the strip threading guide plate;

[0019] The jaws of the reel clamp the strip, and the diameter of the reel expands to establish initial tension. When the jaws pass through the working positions of each auxiliary pressure roller in turn, each auxiliary pressure roller presses the strip onto the reel accordingly. After winding several turns of strip, the coiler establishes full tension operation;

[0020] b. At the end of coiling, the bending machine is used to bend the strip steel, and the auxiliary pressure rollers and the rollers on the unloading car are combined to form an auxiliary coiling roller group to assist in completing the coiling of the strip tail.

[0021] The present invention also relates to a high-strength steel production line, comprising a uncoiler and a high-strength steel processing system, and also comprising the strip coiling system as described above, wherein the bending machine is arranged downstream of the high-strength steel processing system and connected to the high-strength steel processing system.

[0022] The present invention has at least the following beneficial effects:

[0023] The present invention provides a bending machine, (1) to straighten the strip steel at the initial stage of coiling, to prevent the strip steel from warping or lowering and damaging the strip guide plate, and to enable the strip steel, especially high-strength steel, to enter the jaws of the reel smoothly and accurately; (2) at the end of coiling, since the sheared strip tail is free and tension-free, the strip steel is bent by the bending machine to produce plastic deformation and energy consumption, which can provide post-tension for coiling; at the same time, the strip steel is plastically deformed by the bending machine, and the strip steel coming out of the bending machine is made to have a spring curvature change slightly larger than the radius of the current coiled steel coil, so that after the strip steel is coiled, the rebound force of the outer ring strip steel can be greatly reduced, which is convenient for subsequent operations such as bundling the steel coils. By providing an auxiliary pressure roller, the strip steel can be attached to the reel / coil during coiling, which improves the coiling effect of the strip steel and can avoid problems such as bulging near the jaws when high-strength steel and other steel types are coiled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the state of a strip steel coiling system provided by an embodiment of the present invention at the initial stage of coiling;

[0026] Figure 2 A schematic diagram of the state of the strip coiling system provided by an embodiment of the present invention at the end of coiling;

[0027] Figure 3 A schematic diagram of the structure of the winding jaws provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the composition and layout of a strip steel tempering treatment system provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the structure of a quenching and cooling device provided in an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of the working state of the cooling mechanism provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] like Figure 1 and Figure 2 An embodiment of the present invention provides a strip steel coiling system, comprising a coiler, a steering pinch roller 2 and a coil unloading car 6, wherein the steering pinch roller 2 is connected to the coiler through a strip threading guide plate, a bending machine 3 is provided on the material incoming side of the steering pinch roller 2, at least one auxiliary pressure roller 5 is arranged around the reel 1 of the coiler, the axial direction of the auxiliary pressure roller 5 is parallel to the axial direction of the reel 1, and the auxiliary pressure roller 5 is configured with an auxiliary pressure roller 5 driving unit so as to have a working position in rolling contact with the steel coil 7 and a standby position away from the steel coil 7.

[0034] The coiler, the steering pinch roller 2 and the coil unloading vehicle 6 are all conventional equipment in the art, and their specific structures are not described in detail here.

[0035] Existing equipment that can bend steel strips is applicable to this embodiment. In a preferred embodiment, Figure 1 and Figure 2 The bending machine 3 includes a casing and a plurality of bending rollers arranged in the casing, some of which are arranged above the strip running channel, and the remaining bending rollers are arranged below the strip running channel. Each bending roller is staggered along the running direction of the strip and is respectively connected to a lifting drive mechanism. By controlling the height position of each bending roller, the bending operation and the degree of bending of the strip can be controlled; in particular, by controlling the height position of each bending roller to control the bending amount of the strip at the corresponding position, the purpose of straightening the strip can be achieved. In this embodiment, a 4-roller bending machine 3 is used, and two bending rollers are respectively arranged above and below the strip running channel.

[0036] The auxiliary pressure roller 5 driving unit is preferably driven by a hydraulic cylinder. The auxiliary pressure roller 5 can be driven to swing to switch between the working position and the standby position, or it can be driven to move linearly to switch between the working position and the standby position. In this embodiment, the latter method is adopted, that is, the auxiliary pressure roller 5 moves linearly between the working position and the standby position, which has a better pressing effect on the strip steel. Furthermore, the auxiliary pressure roller 5 moves linearly along the radial direction of the reel 1, that is, the extension line of the movement path of the auxiliary pressure roller 5 passes through the axis of the reel 1. As the diameter of the steel coil 7 changes, the pressing position of the auxiliary pressure roller 5 can be ensured to remain unchanged, which is convenient for precise control.

[0037] In a preferred embodiment, Figure 1 and Figure 2 There are multiple auxiliary rollers 5 and they are arranged in sequence along the circumference of the reel 1. Obviously, using multiple auxiliary rollers 5 can further improve the auxiliary coiling effect, so that the strip steel is more adhered to the reel 1. In one embodiment, Figure 1 and Figure 2 , the working positions of the auxiliary rollers 5 are distributed between the 6 o'clock and 12 o'clock positions of the steel coil 7. Since the unloading vehicle 6 is generally arranged below the 6 o'clock position of the steel coil 7, the auxiliary rollers 5 need to avoid this position or one of the auxiliary rollers 5 is arranged on the unloading vehicle 6; the above scheme is particularly suitable for the upper coiling method. Of course, for the lower coiling scheme, the arrangement positions of the auxiliary rollers 5 can also be designed accordingly, for example, the working positions of the auxiliary rollers 5 are distributed between the 9 o'clock and 3 o'clock positions of the steel coil 7, etc.

[0038] Optionally, the working position of one of the auxiliary pressing rollers 5 is located near the initial position of the jaws of the reel 1. For example, for the upper coiling scheme and the working positions of the auxiliary pressing rollers 5 are distributed between the 6 o'clock and 12 o'clock positions of the steel coil 7, the working position of one of the auxiliary pressing rollers 5 can be designed to be located at the 12 o'clock position of the steel coil 7. When coiling, the strip steel can be attached to the reel 1 / steel coil 7, and the problem of bulging near the jaws when coiling high-strength steel and other steel grades can be avoided.

[0039] In particular, the unloading coil car 6 is provided with a roller suitable for rolling contact with the steel coil 7. When the roller is in contact with the steel coil 7 and each of the auxiliary pressure rollers 5 is in the working position, the roller and each of the auxiliary pressure rollers 5 are combined to form an auxiliary winding roller group; at the end of winding, the auxiliary pressure rollers 5 and the rollers on the unloading coil car 6 can be combined to form an auxiliary winding roller group to assist in completing the winding of the tail of the strip, thereby also serving as an auxiliary winding device.

[0040] Following the strip coiling system, the strip threading guide plate is used to guide the strip to the coiler at the beginning and end of coiling. Figure 1 and Figure 2 , the strip threading guide plate includes an upper guide plate 41 and a lower guide plate 42 which are arranged on the upper and lower sides of the strip design steel wire, and the upper guide plate 41 and the lower guide plate 42 are respectively connected to a guide plate driving unit; the so-called strip design steel wire, that is, the strip steel wire between the steering clamping roller 2 and the reel 1 during normal coiling, that is, the strip steel running channel expected to be formed between the steering clamping roller 2 and the reel 1; the guide plate driving unit can adopt conventional hydraulic cylinders and other driving equipment, and the specific guide plate driving method is a conventional technology in this field, which will not be described here. Through the cooperation of the upper guide plate 41 and the lower guide plate 42, the upper surface and the lower surface of the strip can be limited respectively, and the two can form a guiding gap to more accurately guide the strip to the coiler, especially for the coiling of high-strength steel, which can solve the coiling difficulties caused by the high-strength steel plate shape problem to a certain extent. Further preferably, as Figure 1 and Figure 2The end of the upper guide plate 41 is provided with a guide roller (shown in the figure, not marked), which can make the strip steel as close to the lower guide plate 42 as possible, so as to facilitate the coiling of the strip steel, especially to guide the high-strength strip steel smoothly and accurately to the jaws of the reel 1 at the initial stage of coiling. Optionally, both the upper guide plate 41 and the lower guide plate 42 are telescopic guide plates, so that after the upper guide plate 41 and the lower guide plate 42 clamp the strip steel, they can move forward synchronously with the strip steel through the extension operation of the two, thereby ensuring the clamping and guiding effect of the strip steel.

[0041] The strip steel coiling system provided by the embodiment of the present invention can, by setting a bending machine 3, (1) straighten the strip steel at the initial stage of coiling to prevent the strip steel from warping or lowering and damaging the strip guide plate, and enable the strip steel, especially high-strength steel, to enter the jaws of the reel 1 smoothly and accurately; (2) at the end of coiling, since the sheared strip tail is free and tension-free, the strip steel is bent by the bending machine 3 to produce plastic deformation and energy consumption, which can provide post-tension for coiling; at the same time, the strip steel is plastically deformed by the bending machine 3, and the strip steel coming out of the bending machine 3 is made to have a spring curvature change slightly larger than the radius of the current coiled steel coil 7, so that after the strip steel coil 7 is taken, the rebound force of the outer ring strip steel can be greatly reduced, which is convenient for subsequent operations such as bundling the steel coil 7. By setting an auxiliary pressure roller 5, the strip steel can be attached to the reel 1 / steel coil 7 during coiling, thereby improving the coiling effect of the strip steel and avoiding problems such as bulging near the jaws when high-strength steel and other steel types are coiled.

[0042] Embodiment 2

[0043] The embodiment of the present invention provides a winding jaw, which can be used on the reel 1 in the above-mentioned embodiment 1 as the jaw of the reel 1.

[0044] like Figure 3 The jaw includes a fan-shaped plate 11, on which a groove is formed, a fixed jaw plate 12 is provided at one side wall of the groove, a movable jaw plate 13 and a jaw driving unit 14 for driving the movable jaw plate 13 to move closer to or away from the fixed jaw plate 12 are provided in the groove, an outlet guide plate 15 is provided at the other side wall of the groove, the jaw steel surface of the fixed jaw plate 12 is inclined and its outer end is located on the side of its inner end close to the outlet guide plate 15, the outer surface of the outlet guide plate 15 is an arc-shaped guide surface and the space enclosed by the outlet guide plate 15 and the fixed jaw plate 12 gradually expands from the inside to the outside.

[0045] Preferably, the jaw drive unit 14 is a hydraulic cylinder. The use of hydraulic jaws can increase the clamping force. On the one hand, it can meet the initial coiling tension of the strip, especially high-strength steel. On the other hand, it can reduce the depth of the strip head entering the jaws, thereby reducing the rebound force of the strip, especially high-strength steel, and avoiding the protrusion of the strip head in the coil core. Figure 3The jaw driving unit 14 is fixedly mounted on the bottom of the groove.

[0046] In one embodiment, a plurality of serrations are formed on the clamping steel surface of the movable jaw plate 13, and it is further preferred that the clamping steel surface of the movable jaw plate 13 is designed to be a serrated surface; the serrated clamping steel surface can increase the friction between it and the strip steel, thereby improving the clamping effect on the strip steel.

[0047] Optionally, the clamping steel surface of the fixed jaw plate 12 is smooth, so that the strip head is easier to pass through the jaws during unloading. In combination with the serrated clamping steel surface of the movable jaw plate 13, the unloading operation of the coiler is facilitated while ensuring reliable clamping of the strip.

[0048] It can be understood that after the strip head is clamped by the fixed jaw plate 12 and the movable jaw plate 13, the strip steel passes through the above-mentioned outlet guide plate 15 and is wound on the reel 1; the outer surface of the outlet guide plate 15 is used to contact and support the strip steel; the jaw steel surface of the above-mentioned fixed jaw plate 12 is inclined toward the groove wall on the other side of the groove, and the space formed by it and the groove bottom of the groove is a triangular area space that gradually expands from the inside to the outside, and the above-mentioned outlet guide plate 15 is gradually raised from the groove bottom to the groove side, so that the strip steel can be smoothly attached to the outlet guide plate 15. Based on the above structure, through the design of the outlet guide plate 15, the strip steel can be made to have as little bending and change of direction as possible when it passes through the jaws, thereby reducing the plastic deformation of the strip steel when it passes through the jaws, preventing cracks on the surface of the strip steel from causing the strip steel to break, and at the same time, it can reduce the resilience of the strip steel and reduce the difficulty of the strip steel passing through the jaws.

[0049] Further preferably, the arc-shaped guide surface includes a first arc segment and a second arc segment with different curvatures, the second arc segment has the same curvature as the outer surface of the adjacent fan-shaped plate 11 and is smoothly spliced, and the first arc segment is spliced ​​to the other end of the second arc segment (that is, the end close to the fixed jaw plate 12); based on this structure, the strip steel exiting the jaws can be smoothly attached to the fan-shaped plate 11 / reel 1.

[0050] To facilitate the setting of the jaw drive unit 14 and the outlet guide plate 15, a groove may be provided on the outlet guide plate 15 to accommodate the above-mentioned jaw drive unit 14; or two groups of jaw drive units 14 may be provided, and the two groups of jaw drive units 14 are arranged at both ends of the outlet guide plate 15; and there are other arrangements, which are not described in detail here.

[0051] Embodiment 3

[0052] An embodiment of the present invention provides a high-strength steel coiling method, wherein the strip steel coiling system provided in the first embodiment is used to coil the high-strength strip steel, and the method comprises:

[0053] a. Figure 1In the early stage of coiling, the bending machine 3 is used to straighten the strip to prevent the strip from warping or bending and damaging the strip guide plate, and to enable the strip, especially high-strength steel, to enter the jaws of the reel 1 smoothly and accurately; the specific straightening operation has been described in the above embodiment 1 and will not be repeated here.

[0054] The strip is guided to the reel 1 by the steering pinch roller 2 and the strip threading guide plate. This is a conventional operation in the art and will not be described in detail here.

[0055] The jaws of the reel 1 clamp the strip, and the reel 1 expands to establish initial tension. When the jaws pass through the working positions of the auxiliary rollers 5 in sequence, each auxiliary roller 5 presses the strip against the reel 1 accordingly. Therefore, the coiler does not need to be in full tension state to ensure the coiling effect of the strip. After coiling several turns of strip (preferably 3 to 5 turns), the coiler establishes full tension operation;

[0056] b. Figure 2 At the end of coiling, the strip is bent by the bending machine 3; since the tail of the strip after shearing is free and tension-free, the strip is bent by the bending machine 3 to cause plastic deformation of the strip and generate energy consumption, which can provide post-tension for coiling; at the same time, the strip is plastically deformed by the bending machine 3, and the strip coming out of the bending machine 3 is made to have a spring curvature diameter slightly larger than the radius of the current coiled steel coil 7, so that after the strip is coiled, the rebound force of the outer ring strip can be greatly reduced, which is convenient for subsequent operations such as bundling of the steel coil 7.

[0057] Specifically, when receiving the coil splitting signal, the strip guide is in place (for the structure including the upper guide 41 and the lower guide 42, only the lower guide 42 can be lifted), the pinch roller is pressed down, and the strip is bent by the bending machine 3; when the slitting operation is completed, the coiler continues to coil and completes the coiling of the strip tail. Preferably, each auxiliary pressure roller 5 and the roller combination on the unloading car 6 constitute an auxiliary coiling roller group to assist in the coiling of the strip tail, that is, each auxiliary pressure roller 5 is pressed against the steel coil 7, and the unloading car 6 rises until the roller contacts the steel coil 7. The auxiliary coiler composed of each auxiliary pressure roller 5 and the roller can effectively prevent the strip tail from rebounding in a tension-free state.

[0058] It can be understood that in the normal coiling process, each auxiliary pressure roller 5 is in the standby position, the strip threading guide is also in the idle position, the pinch roller is opened, and the bending machine 3 is opened. When the coiling is completed and the coiling operation needs to be unloaded, the unloading car 6 contacts the strip steel, the jaws are opened, the reel 1 is reduced by 20% and then rotated forward 45°, and after the strip head is out of the jaws, the diameter is expanded again and then reduced to the minimum coil diameter before unloading.

[0059] Embodiment 4

[0060] An embodiment of the present invention provides a high-strength steel production line, including a uncoiler and a high-strength steel processing system, and also includes the strip coiling system provided in the above-mentioned embodiment one, wherein the bending machine 3 is arranged downstream of the high-strength steel processing system and connected to the high-strength steel processing system.

[0061] In one embodiment, the high-strength steel processing system is used to perform quenching and tempering treatment on high-strength steel strip.

[0062] like Figure 4 The present embodiment provides a strip tempering treatment system, which can be used as the above-mentioned high-strength steel processing system, and includes a strip quenching device and a strip tempering device. The strip quenching device includes a quenching heating section and a quenching cooling section 817 arranged in sequence along the running direction of the strip, and the quenching heating section includes a first longitudinal magnetic induction heating furnace section 812, a transverse magnetic induction heating furnace section 813 and a first equalizing furnace section 815 arranged in sequence along the running direction of the strip; the strip tempering device includes a tempering heating section and a tempering cooling section arranged in sequence along the running direction of the strip, and the tempering heating section includes a second longitudinal magnetic induction heating furnace section 832 and a second equalizing furnace section 834 arranged in sequence along the running direction of the strip; a temperature correction device 82 is arranged between the quenching cooling section 817 and the tempering heating section.

[0063] The first longitudinal magnetic induction heating furnace section 812 can adopt a conventional longitudinal magnetic induction heating device in the art, and the transverse magnetic induction heating furnace section 813 can adopt a conventional transverse magnetic induction heating device in the art, such as the "transverse magnetic line induction heating device with variable magnetic circuit width" disclosed in CN01117018.2, and the "wide-area induction heating device for uniformly heating strip steel" disclosed in CN201410011044.4. The specific structure is not repeated here. In this embodiment, in the first longitudinal magnetic induction heating furnace section 812, the power supply system uses 10khz industrial frequency IGBT power supply technology, the inductor adopts single-turn whole-plate induction coil technology, and the cavity is sealed specifically through the muffle furnace structure in the inductor coil, and the cavity sealing device adopts double-layer sealing sleeve structure technology; in the transverse magnetic induction heating furnace section 813, the power supply system uses 1khz industrial frequency IGBT power supply technology, the inductor adopts multi-turn induction coil technology, and the cavity is sealed specifically through the muffle furnace structure in the inductor coil, and the cavity sealing device adopts double-layer sealing sleeve structure technology. Among them, preferably, in the first longitudinal magnetic induction heating furnace section 812, the strip is rapidly heated from room temperature to 700°C, achieving rapid heating while ensuring high comprehensive thermal efficiency; in the transverse magnetic induction heating furnace section 813, the strip is heated from 700°C to 950°C, achieving rapid and efficient heating after the Curie temperature point.

[0064] The first soaking furnace section 815 can be used to heat and evenly heat the steel strip after quenching and heating, so as to achieve austenitization and heat preservation of the steel strip, effectively improve the performance of the steel strip, and promote the consistency of the performance of the steel strip; wherein, preferably, the first soaking furnace section 815 is equipped with electric radiation heating tubes, and the electric radiation tube heating technology can achieve a better heat preservation effect; electromagnetic induction heating technology and electric radiation tube heating technology are used to achieve rapid quenching heating and heat preservation and even heating, which can greatly reduce the length of the quenching and heating furnace section, save more than 1 / 2 of the furnace section length, and realize intensive short-process production. Further preferably, a circulating fan for strengthening furnace gas disturbance is also provided in the first soaking furnace section 815, which can improve the temperature uniformity in the furnace section and reduce the operating energy consumption.

[0065] Similarly, the second longitudinal magnetic induction heating furnace section 832 can adopt the conventional longitudinal magnetic induction heating device in the field, and the specific structure is not described here. In this embodiment, in the second longitudinal magnetic induction heating furnace section 832, the power supply system uses 10khz industrial frequency IGBT power supply technology, and the inductor adopts single-turn whole plate induction coil technology. The cavity sealing is realized by the muffle furnace structure in the inductor coil, and the cavity sealing device adopts double-layer sealing sleeve structure technology. Among them, the second longitudinal magnetic induction heating furnace section 832 can realize rapid tempering heating of the strip before 700℃, and can realize low-temperature tempering (150-250℃), medium-temperature tempering (350-500℃) and high-temperature tempering (650-700℃) according to the tempering process requirements.

[0066] The second equalizing furnace section 834 can be used to heat and equalize the tempered steel strip, improve the uniformity of the strip width structure and carbide precipitation, and thus improve the performance consistency of the steel strip product. Preferably, the second equalizing furnace section 834 is equipped with electric radiation heating tubes, and the electric radiation tube heating technology can achieve a better equalization and heat preservation effect; electromagnetic induction heating technology and electric radiation tube heating technology are used to achieve rapid tempering heating and heat preservation and equalization, which can greatly reduce the length of the tempering heating furnace section, save more than 1 / 2 of the furnace section length, and realize intensive short-process production. Further preferably, the second equalizing furnace section 834 is also provided with a circulating fan for strengthening the furnace gas disturbance, which can improve the temperature uniformity in the furnace section and reduce the operating energy consumption.

[0067] The above-mentioned temperature correction device 82 can straighten and level the strip shape after quenching, which can improve the quality of subsequent strip tempering and quenching, and avoid further deterioration of the bad shape during the tempering and quenching process, thereby improving the final strip tempering treatment quality. The temperature correction device 82 can adopt one or more of a tension correction machine, a roller correction machine and a tension roller correction machine; in one embodiment, the strip shape after quenching can be straightened and leveled from the 20I level to the 10I level.

[0068] Further preferably, the quenching cooling section 817 and the temperature straightening device 82, as well as the temperature straightening device 82 and the tempering heating section are connected via a strip conveying roller, so that the strip tempering treatment system constitutes a continuous tempering treatment line, which can significantly improve the efficiency and output of the strip tempering treatment.

[0069] The strip quenching device is further optimized, the quenching heating section also includes a first edge heating furnace section 814, the first edge heating furnace section 814 is arranged between the transverse magnetic induction heating furnace section 813 and the first soaking furnace section 815, the first edge heating furnace section 814 includes two groups of first edge heating mechanisms for heating the edge of the strip, and the two groups of first edge heating mechanisms are arranged on the transmission side and the operation side of the furnace body. By arranging the first edge heating furnace section 814 after the first longitudinal magnetic induction heating furnace section 812 and the transverse magnetic induction heating furnace section 813, the temperature difference area of ​​the strip edge generated by the combination of longitudinal magnetic induction heating and transverse magnetic induction heating can be supplemented with heat to reduce or avoid the temperature non-uniformity in the width direction of the strip, significantly improve the quenching quality of the strip, improve the uniformity of the organization and carbide precipitation in the width direction of the strip, and ensure the performance consistency of the product in the width direction.

[0070] The first edge heating mechanism preferably also adopts magnetic induction heating technology. Specifically, the first edge heating mechanism includes a first edge magnetic induction heater arranged on the corresponding side of the furnace body and a first magnetic shielding structure for limiting the magnetic field of the first edge magnetic induction heater to the corresponding edge of the strip. The first magnetic shielding structure selectively shields part of the magnetic field, allowing part of the magnetic field to extend in a set direction, so that the magnetic field can act on the edge area to be heated of the strip, and the direction of the magnetic field conforms to the preset direction, for example, heating is performed along the width direction or length direction of the strip. Through the magnetic field adjustment ability of the first edge magnetic induction heater itself and the selective shielding effect of the first magnetic shielding structure, a better magnetic field control ability can be obtained to achieve a magnetic induction heating effect of a specified direction and a specified intensity. The first magnetic shielding structure can, for example, adopt a magnetic field shielding cover and open a magnetic field channel on the magnetic field shielding cover. In another embodiment, the first magnetic shielding structure includes a first shielding copper plate arranged on the corresponding side of the furnace body, and the plate surface of the first shielding copper plate is parallel to the running direction of the strip. Obviously, the arrangement position of the first shielding copper plate satisfies the requirement that the magnetic field of the first edge magnetic induction heater acts on the edge area to be heated of the strip. In a preferred solution, the magnetic field width constrained by the first magnetic shielding structure is 45 to 60 mm, preferably about 50 mm, that is, one side boundary of the strip edge heating is the strip edge, and the other side boundary is 45 to 60 mm away from the strip edge, which can better cover the temperature difference area of ​​the strip edge. In an optional solution, the first edge electromagnetic induction heater can be driven by a mobile trolley to approach or move away from the strip running channel to achieve the switching of the first edge electromagnetic induction heater between the working state and the standby state, and can adjust the target magnetic field action position of the first edge electromagnetic induction heater according to specific working conditions, wherein: if the first magnetic shielding structure is a static shield, the first edge electromagnetic induction heater can be driven to move to heat different edge width ranges of the strip, or to adapt to the heating operation of strips of different width specifications; if the first magnetic shielding structure is a dynamic shield, that is, the constrained magnetic field width and / or magnetic field direction can be adjusted, then combined with the movement of the first edge electromagnetic induction heater, the magnetic field heating area can be more accurately controlled to improve the uniformity of the strip edge heating effect. Similarly, the first edge electromagnetic induction heater is preferably also capable of being driven by a moving trolley to move closer to or farther from the strip running channel.

[0071] like Figure 4 An inlet sealing chamber 811 is provided at the inlet side of the furnace body of the above-mentioned strip quenching device, and an outlet sealing chamber 816 is provided at the outlet side of the furnace body to ensure the stability of the temperature field in the furnace.

[0072] The strip tempering device is further optimized, the tempering heating section also includes a second edge heating furnace section 833, the second edge heating furnace section 833 is arranged between the second longitudinal magnetic induction heating furnace section 832 and the second soaking furnace section 834, the second edge heating furnace section 833 includes two groups of second edge heating mechanisms for heating the edge of the strip, and the two groups of second edge heating mechanisms are arranged on the transmission side and the operation side of the furnace body. By arranging the second edge heating furnace section 833 after the second longitudinal magnetic induction heating furnace section 832, the temperature difference area of ​​the strip edge generated by the longitudinal magnetic induction heating can be supplemented with heat to reduce or avoid the temperature non-uniformity in the width direction of the strip, significantly improve the strip tempering quality, improve the uniformity of the hot-rolled or cold-rolled strip width direction structure and carbide precipitation, and ensure the product width direction performance consistency. Similarly, the second edge heating mechanism includes a second edge magnetic induction heater arranged on the corresponding side of the furnace body and a second magnetic shielding structure for limiting the magnetic field of the second edge magnetic induction heater to the corresponding edge of the strip. The second magnetic shielding structure selectively shields part of the magnetic field, allowing part of the magnetic field to extend in a set direction, so that the magnetic field can act on the edge area of ​​the strip to be heated, and the direction of the magnetic field conforms to the preset direction, for example, heating is performed along the width direction or length direction of the strip; through the magnetic field adjustment capability of the second edge magnetic induction heater itself and the selective shielding effect of the second magnetic shielding structure, a better magnetic field control capability can be obtained to achieve a magnetic induction heating effect of a specified direction and a specified intensity. The above-mentioned second magnetic shielding structure can, for example, adopt a magnetic field shielding cover and open a magnetic field channel on the magnetic field shielding cover. In another embodiment, the above-mentioned second magnetic shielding structure includes a second shielding copper plate arranged on the corresponding side of the furnace body, and the plate surface of the second shielding copper plate is parallel to the running direction of the strip. Obviously, the arrangement position of the second shielding copper plate satisfies the requirement that the magnetic field of the second edge magnetic induction heater acts on the edge area of ​​the strip to be heated. In a preferred solution, the width of the magnetic field constrained by the second magnetic shielding structure is 45-60 mm, preferably about 50 mm, that is, one side boundary of the strip edge heating is the strip edge, and the other side boundary is 45-60 mm away from the strip edge, which can better cover the strip edge temperature difference area. Similarly, the second edge electromagnetic induction heater is also preferably driven by a mobile trolley to move closer to or away from the strip running channel.

[0073] To further optimize the above-mentioned strip tempering device, the cooling mechanism configured in the tempering cooling section includes a circulating gas spray cooling mechanism 835, that is, the hot gas after cooling the strip in the device is extracted by the circulating fan, and becomes cold gas after being cooled by the heat exchanger, and then the cold gas is sprayed onto the upper and lower surfaces of the strip at a certain pressure by the circulating fan, which can significantly reduce the degree of new oxide layer of the strip. The temperature of the strip can be quickly cooled to ~500°C by the circulating gas spray cooling mechanism 835. Preferably, the circulating gas spray cooling mechanism 835 is arranged in the furnace body of the tempering heating section and is located at the tail of the furnace body; based on this structure, on the one hand, it can further reduce the new oxide layer of the strip, and on the other hand, it can further improve the compactness of the strip tempering device. Similarly, if Figure 4 An inlet sealing chamber 831 is provided at the inlet side of the furnace body of the strip tempering device, and an outlet sealing chamber 836 is provided at the outlet side of the furnace body to ensure the stability of the temperature field in the furnace; and the circulating gas blowing cooling section is sealed by the outlet side sealing chamber 836 of the furnace body, which can reduce the number of sealing devices and reduce the equipment cost. Further preferably, as Figure 4 The cooling mechanism configured in the tempering cooling section also includes an out-of-furnace cooling mechanism 837, and the out-of-furnace cooling mechanism 837 adopts an air blowing cooling mechanism and / or a water spray cooling mechanism to cool the strip temperature from about 500°C to room temperature.

[0074] In the above-mentioned strip quenching device, it is preferred to adopt the following cooling scheme:

[0075] like Figure 5 , a quenching and cooling device is provided, comprising a plurality of cooling boxes 8171 arranged in sequence along the running direction of the strip steel, an intermediate tension roller 8173 is arranged between two adjacent cooling boxes 8171, a squeeze roller 8174 is arranged at the outlet side of the tail cooling box 8171, and a quenching and cooling mechanism 8172 is arranged in the cooling box 8171, and the cooling mechanism includes an aerosol cooling mechanism and / or a water spray cooling mechanism. Preferably, an inlet pinch roller 8175 is arranged at the inlet side of the head cooling box 8171, which is used to pinch the strip steel for stable cooling; it can be understood that a conveying roller is arranged in each cooling box 8171 to support the strip steel.

[0076] The above-mentioned intermediate tension roller 8173 can realize the tension control of the running strip, better control the strip shape, avoid large shape changes due to quenching and cooling, and thus improve the strip quality and product performance. The above-mentioned intermediate tension roller 8173 is preferably provided with at least two groups to realize tension segmentation control, and the tension control can be carried out accordingly according to the quenching and cooling process of the strip, so as to better control the strip shape; then the above-mentioned cooling box 8171 is preferably not less than three. Furthermore, the above-mentioned intermediate tension roller 8173 is driven by a variable frequency motor; in an optional scheme, the above-mentioned intermediate tension roller 8173 includes an upper movable roller and a lower fixed roller, and the upper movable roller can be driven to rise and fall by a driving device such as a hydraulic cylinder, so that the roller gap of the intermediate tension roller 8173 can be adjusted as needed.

[0077] The squeeze roller 8174 can partially remove the cooling water remaining on the surface of the strip. The squeeze roller 8174 is a conventional device in the metallurgical field, and its specific structure is not described here. Figure 5 The outlet side of the squeeze roller 8174 is provided with a drying unit 8176, which can further remove residual water stains on the surface of the strip to ensure the surface quality of the strip; the drying unit 8176 can use hot air drying, for example, it includes a drying box and a hot air supply pipe arranged on the drying box.

[0078] It can be understood that the above-mentioned aerosol cooling mechanism includes an aerosol cooling nozzle, which can adopt a conventional two-fluid nozzle, and the cooling water forms atomized water under the action of high-pressure gas; the above-mentioned water spray cooling mechanism includes a water mist nozzle, and the cooling water can form atomized water under the mechanical action. The strip is cooled by atomized cooling medium, and the cooling effect on the strip is better. The quenching cooling parameters such as the quenching cooling rate and the strip final cooling temperature are easy to control, so as to obtain good strip quality and plate shape, which can better meet the needs of continuous quenching or isothermal quenching of the strip, especially the production of thin-gauge strip. Among them, the control of the cold zone rate and the final cooling temperature of the strip can be controlled by accurately controlling the cooling water volume and cooling time.

[0079] In this embodiment, it is preferred to use an aerosol cooling mechanism, which has a better atomization effect of cooling water. Figure 5 A mist exhaust pipe 8177 is provided on the cooling box 8171, and the gas medium in the cooling box 8171 is extracted by the induced draft fan; a gas-water separation device can be set at the mist exhaust port of the cooling box 8171.

[0080] Following the above quenching and cooling equipment, the quenching and cooling mechanism 8172 includes an upper cooling unit arranged above the strip running channel and a lower cooling unit arranged below the strip running channel. Both the upper cooling unit and the lower cooling unit include a plurality of cooling nozzles 81721 arranged at intervals along the width direction of the strip running channel. The cooling nozzles 81721 are gas mist cooling nozzles or water mist nozzles. The upper cooling unit is used to cool the upper surface of the strip, and the lower cooling unit is used to cool the lower surface of the strip. The two cooperate to obtain the required cooling rate and strip final cooling temperature, and can improve the uniformity of strip cooling.

[0081] In a further preferred scheme, each group of cooling units includes a middle nozzle for cooling the middle part of the strip and an edge nozzle for cooling the edge of the strip. Each middle nozzle of each group of cooling units is installed on the first medium supply pipe, and each edge nozzle of each group of cooling units is installed on the second medium supply pipe, that is, the cooling of the middle part of the strip and the cooling of the edge of the strip are independent of each other, and different cooling rates can be used for different areas of the strip to ensure cooling uniformity in the width direction of the strip, thereby obtaining a good strip shape and saving cooling medium consumption.

[0082] More preferably, if Figure 6 In the upper cooling unit, a first water baffle 81722 is provided below at least part of the cooling nozzles 81721, and at least part of the plate body of the first water baffle 81722 overlaps with the spraying area of ​​the corresponding cooling nozzle 81721, or at least part of the plate body of the first water baffle 81722 extends to the spraying path of the corresponding cooling nozzle 81721. On the one hand, the spraying range of the cooling nozzle 81721 can be adjusted by the first water baffle 81722, so as to adjust the cooling effect of the upper cooling unit according to different strip conditions, and on the other hand, the cooling width of the upper cooling unit can be adjusted to meet the quenching cooling requirements of strips of different widths. It can be understood that the first water baffle 81722 is configured for the edge nozzles, especially the outermost edge nozzles. It can be further designed that the overlapping area between at least part of the first water baffle 81722 and the spraying area of ​​the corresponding cooling nozzle 81721 is adjustable, and the above-mentioned cooling effect and / or cooling width adjustment effect of the upper cooling unit is better; in one embodiment, the first water baffle 81722 is configured with a lifting drive unit, for example, the first water baffle 81722 is driven to rise and fall by a linear drive device such as a cylinder, so as to achieve the adjustment of the shielding area of ​​the cooling nozzle 81721 by the first water baffle 81722. Of course, horizontally driving the first water baffle 81722 and other methods are also feasible solutions, which are not described in detail here.

[0083] More preferably, if Figure 6The first water baffle 81722 is a grooved plate that is wide on both sides and low in the middle. This can prevent the cooling water blocked by the first water baffle 81722 from dripping back onto the surface of the strip. The grooved first water baffle 81722 can also drain and recycle the blocked cooling water.

[0084] Similarly, the above-mentioned water retaining structure can also be used in the lower cooling unit to adjust the cooling effect and / or cooling width of the lower cooling unit, that is, a second water retaining plate 81723 is provided above at least part of the cooling nozzles 81721, and at least part of the plate body of the second water retaining plate 81723 overlaps with the spraying area of ​​the corresponding cooling nozzle 81721. The second water retaining plate 81723 can be fixedly installed or movably installed.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A strip steel coiling system, comprising a coiler, a steering pinch roller and a coil unloading vehicle, wherein the steering pinch roller is connected to the coiler through a strip threading guide plate, and characterized in that: A bending machine is provided on the material-incoming side of the steering pinch roller, and at least one auxiliary pressing roller is arranged around the reel of the coiler, the axial direction of the auxiliary pressing roller is parallel to the axial direction of the reel, and the auxiliary pressing roller is equipped with an auxiliary pressing roller driving unit so as to have a working position in rolling contact with the steel coil and a standby position away from the steel coil; There are multiple auxiliary pressure rollers and they are arranged in sequence along the circumference of the reel; The working position of one of the auxiliary pressing rollers is located near the initial position of the roll jaws; The strip threading guide plate comprises an upper guide plate and a lower guide plate respectively arranged on the upper and lower sides of the strip steel design wire, wherein the upper guide plate and the lower guide plate are respectively connected to a guide plate driving unit; a guide roller is provided at the end of the upper guide plate; The bending machine is used to straighten the strip steel at the initial stage of coiling, and to bend the strip tail at the final stage of coiling to cause plastic deformation of the strip steel; The jaws of the reel include a fan-shaped plate with a groove formed on the fan-shaped plate, a fixed jaw plate is provided on one side wall of the groove, a movable jaw plate and a jaw driving unit for driving the movable jaw plate to approach or move away from the fixed jaw plate are provided in the groove, an outlet guide plate is provided on the other side wall of the groove, the jaw steel surface of the fixed jaw plate is inclined and its outer end is located on the side of its inner end close to the outlet guide plate, the outer surface of the outlet guide plate is an arc-shaped guide surface and the space enclosed by the outlet guide plate and the fixed jaw plate gradually expands from the inside to the outside, and the outlet guide plate gradually bulges from the bottom of the groove to the groove side, so as to facilitate the strip to fit smoothly on the outlet guide plate.

2. The strip coiling system according to claim 1, characterized in that: The working positions of the auxiliary pressing rollers are distributed between the 6 o'clock and 12 o'clock positions of the steel coil.

3. The strip coiling system according to claim 1 or 2, characterized in that: The coil unloading vehicle is provided with rollers suitable for rolling contact with the steel coil. When the rollers are in contact with the steel coil and each of the auxiliary pressure rollers is in the working position, the rollers and each of the auxiliary pressure rollers are combined to form an auxiliary coiling roller group.

4. The strip coiling system according to claim 1, characterized in that: The upper guide plate and the lower guide plate are both telescopic guide plates.

5. A high-strength steel coiling method, characterized in that: A strip steel coiling system according to any one of claims 1 to 4 is used to coil high-strength strip steel, the method comprising: a. In the early stage of coiling, the strip is straightened by the bending machine, and the strip is guided to the reel by the steering pinch roller and the strip threading guide plate; The jaws of the reel clamp the strip, and the diameter of the reel expands to establish initial tension. When the jaws pass through the working positions of each auxiliary pressure roller in turn, each auxiliary pressure roller presses the strip onto the reel accordingly. After winding several turns of strip, the coiler establishes full tension operation; b. At the end of coiling, the bending machine is used to bend the strip steel, and the auxiliary pressure rollers and the rollers on the unloading car are combined to form an auxiliary coiling roller group to assist in completing the coiling of the strip tail.

6. A high-strength steel production line, comprising an uncoiler and a high-strength steel processing system, characterized in that: It also includes a strip coiling system as claimed in any one of claims 1 to 4, wherein the bending machine is arranged downstream of the high-strength steel processing system and connected to the high-strength steel processing system.

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