A strip tempering treatment system

Abstract

The present invention relates to a strip quenching and tempering treatment system, which includes a strip quenching device and a strip tempering device. In the strip quenching device, the quenching heating section includes a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section, and a first soaking furnace section arranged in sequence along the running direction of the strip. In the strip tempering device, the tempering heating section includes a second longitudinal magnetic induction heating furnace section and a second soaking furnace section arranged in sequence along the running direction of the strip. A temperature straightening device is arranged between the quenching cooling section and the tempering heating section. By adopting the induction heating method to realize the rapid quenching and temperature rise of the strip, the critical temperature of austenitization and the solution temperature of cementite can be increased, and the time for austenitization and carbide solution can be reduced. By adopting the induction heating method to realize the rapid tempering of the strip to the tempering temperature, the holding time can be shortened, and the precipitated carbides in the steel can be finer. Therefore, finer structures and carbide precipitations can be obtained, and the strip has better impact toughness and strength, which is particularly beneficial for the production of high-strength steel.

Description

Technical Field

[0001] The present invention relates to a strip steel quenching and tempering treatment system. Background Art

[0002] Strip steel quenching and tempering treatment can greatly adjust the material of strip steel, and it has good strength, plasticity and toughness, with good comprehensive mechanical properties. It is an important production means to obtain high-quality strip steel products, especially for the production of high-strength steel.

[0003] Strip steel quenching and tempering treatment is a double treatment process of strip steel quenching + strip steel tempering. At present, the strip steel quenching furnace and strip steel tempering furnace mainly adopt gas heating method. Due to the limitations of low heating rate and limited maximum heating temperature of radiation tubes in the gas heating method, the lengths of the conventional quenching furnace and tempering furnace sections are very long, and the production capacity is not high. At the same time, due to the inability to achieve rapid heating process, it is impossible to obtain high-quality strip steel products or the strip steel products fluctuate greatly. Patent CN101831530 A discloses a heat treatment process for improving the comprehensive mechanical properties of low-alloy high-strength steel. This method refines the martensite structure through 3 to 6 cycles of quenching + tempering process, thereby improving the strength of the steel. However, this method requires multiple heating and cooling, with high energy consumption and long production cycle. Patent CN01117018.2 discloses a transverse magnetic induction heating device with variable magnetic circuit width, and patent CN201410011044.4 discloses a wide-width surface induction heating device for uniformly heating strip steel. These induction heating devices are all used in strip steel annealing furnaces, and there are also problems of poor temperature uniformity and shape control of the strip. Summary of the Invention

[0004] The present invention relates to a strip steel quenching and tempering treatment system, which can at least solve some defects of the prior art.

[0005] The present invention relates to a strip steel quenching and tempering treatment system, including a strip steel quenching device and a strip steel tempering device.

[0006] The strip steel quenching device includes a quenching heating section and a quenching cooling section arranged in sequence along the running direction of the strip steel. The quenching heating section includes a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section and a first soaking furnace section arranged in sequence along the running direction of the strip steel.

[0007] The strip steel tempering device includes a tempering heating section and a tempering cooling section arranged in sequence along the running direction of the strip steel. The tempering heating section includes a second longitudinal magnetic induction heating furnace section and a second soaking furnace section arranged in sequence along the running direction of the strip steel.

[0008] A temperature straightening device is arranged between the quenching cooling section and the tempering heating section.

[0009] As one of the implementation manners, the quenching and cooling section and the warm straightening device, as well as the warm straightening device and the tempering heating section are connected through strip conveying roller tables, so that the strip quenching and tempering treatment system is configured as a continuous quenching and tempering production line.

[0010] As one of the implementation manners, the quenching heating section further includes a first edge heating furnace section, which is arranged between the transverse magnetic induction heating furnace section and the first soaking furnace section. The first edge heating furnace section includes two groups of first edge heating mechanisms for heating the strip edges, and the two groups of first edge heating mechanisms are respectively arranged on the drive side and the operation side of the furnace body.

[0011] As one of the implementation manners, the first edge heating mechanism includes a first edge electromagnetic induction heater arranged on the corresponding side of the furnace body and a first magnetic shielding structure for controlling the magnetic field distribution and intensity of the first edge electromagnetic induction heater.

[0012] As one of the implementation manners, the quenching and cooling section includes a plurality of cooling boxes arranged in sequence along the strip running direction, an intermediate tension roller is arranged between adjacent two cooling boxes, and a cooling mechanism is arranged in the cooling box.

[0013] As one of the implementation manners, the tempering heating section further includes a second edge heating furnace section, which is arranged between the second longitudinal magnetic induction heating furnace section and the second soaking furnace section. The second edge heating furnace section includes two groups of second edge heating mechanisms for heating the strip edges, and the two groups of second edge heating mechanisms are respectively arranged on the drive side and the operation side of the furnace body.

[0014] As one of the implementation manners, the second edge heating mechanism includes a second edge electromagnetic induction heater arranged on the corresponding side of the furnace body and a second magnetic shielding structure for controlling the magnetic field distribution and intensity of the second edge electromagnetic induction heater.

[0015] As one of the implementation manners, the tempering and cooling section includes a circulating gas injection cooling furnace section, the circulating gas injection cooling furnace section is integrally connected and communicated with the second soaking furnace section, and the circulating gas injection cooling furnace section adopts a nitrogen injection cooling mechanism.

[0016] As one of the implementation manners, the cooling mechanism configured in the tempering and cooling section further includes a low-temperature cooling mechanism, and the low-temperature cooling mechanism adopts an air injection cooling mechanism and / or a water spray cooling mechanism.

[0017] As one of the implementation manners, the first soaking furnace section and the second soaking furnace section are both configured with electric radiation heating tubes.

[0018] The present invention has at least the following beneficial effects:

[0019] The strip tempering treatment system provided by the present invention uses induction heating to rapidly heat up the strip for quenching, increases the critical austenitizing temperature Ac3 and the cementite dissolution temperature Acc by increasing the quenching heating rate, and at the same time reduces the austenitizing and carbide dissolution time; uses induction heating to rapidly temper the strip to the tempering temperature, shortens the holding time by increasing the tempering rate, and makes the precipitated carbides in the steel finer; compared with the traditional strip tempering treatment, the present invention can obtain finer microstructure and carbide precipitation, so the strip has better impact toughness and strength, which is particularly beneficial for the production of high-strength steel. A temperature straightening device is arranged between the strip quenching device and the strip tempering device, which can straighten and flatten the shape of the strip after quenching, improve the quality of subsequent strip tempering, and thus improve the quality of the final strip tempering treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the composition layout of the strip tempering treatment system provided by the embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the quenching and cooling equipment provided by the embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the working state of the cooling mechanism provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] Such as Figure 1, an embodiment of the present invention provides a strip tempering treatment system, including a strip quenching device and a strip tempering device. The strip quenching device includes a quenching heating section and a quenching cooling section 17 arranged in sequence along the running direction of the strip. The quenching heating section includes a first longitudinal magnetic induction heating furnace section 12, a transverse magnetic induction heating furnace section 13, and a first soaking furnace section 15 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. The tempering heating section includes a second longitudinal magnetic induction heating furnace section 32 and a second soaking furnace section 34 arranged in sequence along the running direction of the strip. A temperature straightening device 2 is arranged between the quenching cooling section 17 and the tempering heating section.

[0026] The above-mentioned first longitudinal magnetic induction heating furnace section 12 can adopt a conventional longitudinal magnetic induction heating device in the art, and the above-mentioned transverse magnetic induction heating furnace section 13 can adopt a conventional transverse magnetic induction heating device in the art. For example, the "transverse magnetic force line induction heating device with variable magnetic circuit width" disclosed in CN01117018.2, and the "wide-width surface induction heating device for uniformly heating a strip" disclosed in CN201410011044.4. The specific structure will not be elaborated here. In this embodiment, within the above-mentioned first longitudinal magnetic induction heating furnace section 12, the power supply system selects 10khz industrial frequency IGBT power supply technology, and the inductor adopts a single-turn integral plate induction coil technology. Specifically, the cavity is sealed through the muffle furnace structure inside the inductor coil, and the cavity sealing device adopts a double-layer seal sleeve structure technology. Within the above-mentioned transverse magnetic induction heating furnace section 13, the power supply system selects 1khz industrial frequency IGBT power supply technology, and the inductor adopts a multi-turn induction coil technology. Specifically, the cavity is sealed through the muffle furnace structure inside the inductor coil, and the cavity sealing device adopts a double-layer seal sleeve structure technology. Among them, preferably, within the first longitudinal magnetic induction heating furnace section 12, the strip is rapidly heated from room temperature to 700°C, ensuring a high comprehensive thermal efficiency while achieving rapid heating. Within the transverse magnetic induction heating furnace section 13, the strip is heated from 700°C to 950°C, achieving rapid and efficient heating after the Curie temperature point.

[0027] Through the above-mentioned first soaking furnace section 15, the strip after quenching heating can be heated and equalized in temperature, realizing the austenitizing heat preservation of the strip, effectively improving the strip performance, and promoting the strip performance consistency. Among them, preferably, electric radiation heating tubes are configured within the first soaking furnace section 15, and the use of electric radiation tube heating technology can achieve a better equalizing and heat preservation effect. Adopting electromagnetic induction heating technology and electric radiation tube heating technology to achieve rapid quenching heating and equalizing heat preservation can greatly reduce the length of the quenching heating furnace section, save more than 1 / 2 of the furnace section length, and realize intensive short-process production. Further preferably, a circulation fan for strengthening the furnace gas disturbance is also provided within the first soaking furnace section 15, which can improve the temperature uniformity within the furnace section and reduce the operating energy consumption.

[0028] Similarly, the above-mentioned second longitudinal magnetic induction heating furnace section 32 can adopt a conventional longitudinal magnetic induction heating device in the art, and its specific structure will not be elaborated here. In this embodiment, within the above-mentioned second longitudinal magnetic induction heating furnace section 32, the power supply system selects 10 kHz industrial frequency IGBT power supply technology, and the inductor adopts a single-turn integral plate induction coil technology. Specifically, the cavity is sealed through the muffle furnace structure inside the inductor coil, and the cavity sealing device adopts a double-layer seal sleeve structure technology. Among them, the second longitudinal magnetic induction heating furnace section 32 can achieve rapid tempering heating of the strip before 700 °C. Specifically, according to the requirements of the tempering process, low-temperature tempering and quenching (150 - 250 °C), medium-temperature tempering and quenching (350 - 500 °C), and high-temperature tempering and quenching (650 - 700 °C) can be realized.

[0029] Through the above-mentioned second soaking furnace section 34, the strip after tempering and quenching can be heated and equalized in temperature, improving the uniformity of the structure and carbide precipitation in the width direction of the strip, thereby improving the performance consistency of the strip product. Among them, preferably, electric radiation heating tubes are arranged in the second soaking furnace section 34, and the use of electric radiation tube heating technology can achieve a better soaking and heat preservation effect; the adoption of electromagnetic induction heating technology and electric radiation tube heating technology to achieve rapid tempering heating and soaking and heat preservation 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, a circulation fan for strengthening the furnace gas disturbance is also provided in the second soaking furnace section 34, which can improve the temperature uniformity in the furnace section and reduce the operation energy consumption.

[0030] The above-mentioned temperature straightening device 2 can straighten and flatten the shape of the strip after quenching, reduce the deformation of the strip, especially high-strength steel, during the quenching and cooling process, control the strip shape entering the tempering heating furnace, and at the same time can also reduce the heating-up range of the subsequent tempering heating furnace section and reduce energy consumption. Preferably, the straightening temperature of the temperature straightening device 2 is controlled at 100 - 300 °C. It can improve the quality of the subsequent strip tempering and quenching, avoid further deterioration of the bad strip shape during the tempering and quenching process, and thus improve the quality of the final strip quenching and tempering treatment. The temperature straightening device 2 can adopt one or more of a tension straightening machine, a roller straightening machine, and a tension roller straightening machine; in one embodiment, the strip shape after quenching can be straightened and flattened from 20I level to 10I level.

[0031] Further preferably, both between the quenching and cooling section 17 and the temperature straightening device 2 and between the temperature straightening device 2 and the tempering heating section are connected through strip conveying roller tables, so that the strip quenching and tempering treatment system constitutes a continuous quenching and tempering treatment line, which can significantly improve the efficiency and output of the strip quenching and tempering treatment.

[0032] Further optimize the above strip quenching device. The quenching heating section further includes a first side heating furnace section 14, which is arranged between the transverse magnetic induction heating furnace section 13 and the first soaking furnace section 15. The first side heating furnace section 14 includes two groups of first side heating mechanisms for heating the strip edges. The two groups of first side heating mechanisms are respectively arranged on the drive side and the operation side of the furnace body. By arranging the first side heating furnace section 14 after the first longitudinal magnetic induction heating furnace section 12 and the transverse magnetic induction heating furnace section 13, the temperature difference area at the strip edges generated by the combined heating of longitudinal magnetic induction heating and transverse magnetic induction heating can be reheated, so as to reduce or avoid the uneven temperature distribution in the strip width direction, significantly improve the strip quenching quality, improve the uniformity of the structure and carbide precipitation in the strip width direction, and ensure the performance consistency in the strip width direction.

[0033] Preferably, the above first side heating mechanism also adopts electromagnetic induction heating technology. Specifically, the first side heating mechanism includes a first side electromagnetic induction heater arranged on the corresponding side of the furnace body and a first magnetic shielding structure for controlling the magnetic field distribution and intensity of the first side electromagnetic induction heater. The first magnetic shielding structure can avoid the phenomenon of overheating at the strip edges. In one embodiment, the above first magnetic shielding structure includes a first shielding copper plate arranged on the corresponding side of the furnace body. The plate surface of the first shielding copper plate is parallel to the strip running direction. Obviously, the arrangement position of the first shielding copper plate satisfies that the magnetic field of the first side electromagnetic induction heater acts on the strip edge area to be heated. In a preferred solution, the magnetic field width restricted by the above first magnetic shielding structure is 20 - 60 mm, preferably about 50 mm, which can better cover the above strip edge temperature difference area. In an alternative solution, the above first side electromagnetic induction heater can be driven by a moving trolley to be close to or away from the strip running channel, so as to realize the switching between the working state and the standby state of the first side electromagnetic induction heater, and be able to adjust the target magnetic field action position of the first side electromagnetic induction heater according to the specific working conditions, where: if the above first magnetic shielding structure is a static shield, the first side electromagnetic induction heater can be driven to move to heat different edge width ranges of the strip or adapt to the heating operation of strips with different width specifications; if the above first magnetic shielding structure is a dynamic shield, that is, it can adjust the restricted magnetic field width and / or magnetic field direction, combined with the movement of the above first side electromagnetic induction heater, the magnetic field heating area can be more accurately controlled to improve the strip edge heating uniformity effect.

[0034] As Figure 1 , an inlet sealing chamber 11 is provided on the inlet side of the furnace body of the above strip quenching device, and outlet sealing chambers 16 are provided on the outlet side of the furnace body to ensure the stability of the temperature field in the furnace.

[0035] Further optimize the above strip tempering device. The tempering heating section further includes a second side heating furnace section 33, which is arranged between the second longitudinal magnetic induction heating furnace section 32 and the second soaking furnace section 34. The second side heating furnace section 33 includes two groups of second side heating mechanisms for heating the strip edges. The two groups of second side heating mechanisms are arranged on the drive side and the operation side of the furnace body respectively. By setting the second side heating furnace section 33 after the second longitudinal magnetic induction heating furnace section 32, the temperature difference area at the strip edges generated by longitudinal magnetic induction heating can be reheated, so as to reduce or avoid the temperature non-uniformity in the strip width direction, significantly improve the tempering quality of the strip, improve the uniformity of the structure and carbide precipitation in the width direction of hot-rolled or cold-rolled strips, and ensure the performance consistency in the width direction of the product. Similarly, the above second side heating mechanism includes a second side electromagnetic induction heater arranged on the corresponding side of the furnace body and a second magnetic shielding structure for controlling the magnetic field distribution and intensity of the second side electromagnetic induction heater. The second magnetic shielding structure can avoid the phenomenon of overheating at the strip edges. In one embodiment, the above second magnetic shielding structure includes a second shielding copper plate arranged on the corresponding side of the furnace body. The plate surface of the second shielding copper plate is parallel to the strip running direction. Obviously, the arrangement position of the second shielding copper plate satisfies that the magnetic field of the second side electromagnetic induction heater acts on the edge area of the strip to be heated. In a preferred solution, the magnetic field width restricted by the above second magnetic shielding structure is 20 - 60 mm, preferably about 50 mm, which can better cover the above strip edge temperature difference area. In an alternative solution, the above second side electromagnetic induction heater can be driven by a moving trolley to be close to or away from the strip running channel, so as to realize the switching of the second side electromagnetic induction heater between the working state and the standby state, and can adjust the target magnetic field action position of the second side electromagnetic induction heater according to the specific working conditions. Among them: if the above second magnetic shielding structure is a static shielding, the second side electromagnetic induction heater can be driven to move to heat different edge width ranges of the strip, or adapt to the heating operation of strips with different width specifications; if the above second magnetic shielding structure is a dynamic shielding, that is, it can adjust the restricted magnetic field width and / or magnetic field direction, combined with the movement of the above second side electromagnetic induction heater, the magnetic field heating area can be more accurately controlled to improve the strip edge heating uniformity effect.

[0036] In the above-mentioned strip tempering treatment system, a muffle furnace structure is used in the first longitudinal magnetic induction heating furnace section 12, the transverse magnetic induction heating furnace section 13, the first edge heating furnace section 14, the second longitudinal magnetic induction heating furnace section 32 and the second edge heating furnace section 33 to achieve cavity sealing, so that the strip can be induction heated under a protective atmosphere in the sealed cavity. In one preferred embodiment, the muffle furnace structure includes a support layer and a flexible double-layer sealing sleeve, the support layer can be a SIC (silicon carbide) support layer or a stainless steel water-cooled tube support layer, the support layer can be protected by a heat-resistant layer, the heat-resistant layer can be a heat-resistant cotton and / or heat-resistant blanket layer; the flexible double-layer sealing sleeve includes an inner sleeve and an outer sleeve, wherein the inner sleeve can be supported by the support layer, and the inner sleeve forms a first level of sealing protection to prevent leakage of protective gas in the muffle furnace, the strip passes through the inner sleeve to be heated, the outer sleeve is sleeved outside the inner sleeve, and the protective gas is introduced into the interlayer cavity formed between the two to achieve positive pressure protection to form a second level of sealing protection, and the leakage of protective gas in the furnace is suppressed by positive pressure. The muffle furnace using a double-layer sealing sleeve structure can significantly improve the strip heating effect and operation safety.

[0037] The strip tempering device is further optimized, and the tempering cooling section includes a circulating gas spray cooling furnace section 35, and the circulating gas spray cooling furnace section 35 is integrally connected and conductive with the second soaking furnace section 34; the circulating gas spray cooling furnace section 35 preferably adopts a nitrogen spray cooling mechanism. The circulating gas spray cooling mechanism is to extract the hot gas after cooling the strip in the device through the circulating fan, and turn it into cold gas after being cooled by the heat exchanger, and then the circulating fan sprays the cold gas to the upper and lower surfaces of the strip at a certain pressure. The nitrogen circulation spraying method can completely avoid the addition of the strip oxide layer. The temperature of the steel strip can be quickly cooled to 500°C by the circulating gas blowing cooling furnace section 35. Since the circulating gas blowing cooling furnace section 35 is integrally connected to the second equalizing furnace section 34, that is, the circulating gas blowing cooling furnace section 35 is integrated with the tempering heating section furnace body, the tightness and consistency of the atmosphere protection during the process from tempering heating to nitrogen circulation blowing of the steel strip can be ensured, and no additional steel strip oxide layer is generated under medium and high temperature tempering conditions, thereby improving the tempering surface quality and yield rate of the steel strip, and on the other hand, further improving the compactness of the steel strip tempering device. Similarly, if Figure 1 The inlet sealing chamber 31 is provided at the inlet side of the furnace body of the strip tempering device, and the outlet sealing chamber 36 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 furnace section 35 is sealed by the outlet side sealing chamber 36 of the furnace body, which can reduce the number of sealing devices and reduce the equipment cost. Further preferably, as Figure 1, the cooling mechanism arranged in the tempering cooling section further includes a low-temperature cooling mechanism 37, which is preferably located outside the furnace. The low-temperature cooling mechanism 37 adopts an air blowing cooling mechanism and / or a water spraying cooling mechanism to cool the strip temperature from about 500 °C to room temperature.

[0038] In the above strip quenching device, the following cooling scheme is preferably adopted:

[0039] Such as Figure 2 , a quenching cooling device is provided, which includes a plurality of cooling boxes 171 arranged in sequence along the running direction of the strip. An intermediate tension roller 173 is provided between two adjacent cooling boxes 171. A squeezing roller 174 is arranged on the outlet side of the tail-end cooling box 171. A quenching cooling mechanism 172 is provided in the cooling box 171; wherein, the quenching cooling mechanism 172 can adopt at least one of a spraying cooling mechanism, an air fog cooling mechanism, and a water spray cooling mechanism. Optionally, an inlet pinch roll 175 is arranged on the inlet side of the head-end cooling box 171 for pinching the strip to cool it stably; it can be understood that a conveying roller table is respectively arranged in each cooling box 171 to support the strip.

[0040] Through the above intermediate tension roller 173, the tension control of the strip running can be realized, the strip shape can be better controlled, and large strip shape changes caused by quenching cooling can be avoided, thereby improving the strip quality and product performance. The above intermediate tension roller 173 is preferably provided with at least two groups to realize segmented tension control, and the tension control can be carried out accordingly according to the quenching cooling process of the strip, and the control of the strip shape is better; then the above cooling box 171 is preferably not less than three. Further, the above intermediate tension roller 173 is driven by a frequency conversion motor; in an optional scheme, the above intermediate tension roller 173 includes an upper movable roller and a lower fixed roller, and the upper movable roller can be driven to lift by a driving device such as a hydraulic cylinder, so that the roll gap of the intermediate tension roller 173 can be adjusted as needed.

[0041] The above squeezing roller 174 can partially remove the residual cooling water on the surface of the strip. The squeezing roller 174 is a conventional device in the metallurgical field, and its specific structure will not be elaborated here. Further, such as Figure 2 , a drying unit 176 is provided on the outlet side of the squeezing roller 174, which can further remove the residual water stains on the surface of the strip and ensure the surface quality of the strip; the drying unit 176 can adopt hot air drying, for example, it includes a drying box and a hot air supply pipe arranged on the drying box.

[0042] It can be understood that if the quenching cooling mechanism 172 adopts an aerosol cooling mechanism, the aerosol cooling mechanism includes an aerosol cooling nozzle 1721, and the aerosol cooling nozzle 1721 can adopt a conventional two-fluid nozzle, and the cooling water forms atomized water under the action of high-pressure gas; if the quenching cooling mechanism 172 adopts a water spray cooling mechanism, it 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 of 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.

[0043] In this embodiment, it is preferred to use an aerosol cooling mechanism, which has a better atomization effect of cooling water. Figure 2 A mist exhaust pipe 177 is provided on the cooling box 171, and the gas medium in the cooling box 171 is extracted by the induced draft fan; a gas-water separation device can be set at the mist exhaust port of the cooling box 171.

[0044] Following the above quenching and cooling equipment, the quenching and cooling mechanism 172 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 1721 arranged at intervals along the width direction of the strip running channel. The cooling nozzles 1721 are gas mist cooling nozzles 1721 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 final cooling temperature of the strip, and can improve the uniformity of strip cooling.

[0045] 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.

[0046] More preferably, if Figure 3, in the upper cooling unit, a first water baffle 1722 is provided below at least part of the cooling nozzles 1721. At least part of the plate body of the first water baffle 1722 overlaps with the spraying area of the corresponding cooling nozzle 1721, or in other words, at least part of the plate body of the first water baffle 1722 extends to the spraying path of the corresponding cooling nozzle 1721. On the one hand, the spraying range of the cooling nozzle 1721 can be adjusted by the first water baffle 1722, so as to adjust the cooling effect of the upper cooling unit according to different strip conditions. On the other hand, the cooling width of the upper cooling unit can be adjusted to meet the quenching cooling requirements of strips with different widths. It can be understood that the first water baffle 1722 is configured for the edge nozzles, especially the outermost edge nozzles. Further, it can be designed that the overlapping area between at least part of the first water baffle 1722 and the spraying area of the corresponding cooling nozzle 1721 is adjustable, and the above adjustment effect on the cooling effect and / or cooling width of the upper cooling unit is better; in one embodiment, the first water baffle 1722 is configured with a lifting drive unit, for example, the first water baffle 1722 is driven to lift by a linear drive device such as a cylinder, so as to realize the adjustment of the shielding area of the first water baffle 1722 for the cooling nozzle 1721. Of course, the method of horizontally driving the first water baffle 1722 is also a feasible solution, which will not be elaborated here one by one.

[0047] Further preferably, as Figure 3 , the first water baffle 1722 is a trough-shaped plate with wide sides and a low middle, which can prevent the cooling water blocked by the first water baffle 1722 from dripping back onto the strip surface, and the trough-shaped first water baffle 1722 can also drain and recycle the blocked cooling water.

[0048] Similarly, the above water baffle structure can also be adopted in the lower cooling unit to realize the adjustment of the cooling effect and / or cooling width of the lower cooling unit, that is, a second water baffle 1723 is provided above at least part of the cooling nozzles 1721. At least part of the plate body of the second water baffle 1723 overlaps with the spraying area of the corresponding cooling nozzle 1721. Among them, the second water baffle 1723 can be fixedly installed or adopt a movable installation method.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A strip tempering treatment system, comprising a strip quenching device and a strip tempering device, characterized in that: The strip quenching device includes a quenching heating section and a quenching cooling section arranged in sequence along the strip running direction. The quenching heating section includes a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section, and a first soaking furnace section arranged in sequence along the strip running direction; The strip tempering device includes a tempering heating section and a tempering cooling section arranged in sequence along the strip running direction. The tempering heating section includes a second longitudinal magnetic induction heating furnace section and a second soaking furnace section arranged in sequence along the strip running direction; A temperature straightening device is arranged between the quenching cooling section and the tempering heating section; The quenching heating section further includes a first edge heating furnace section, which is arranged between the transverse magnetic induction heating furnace section and the first soaking furnace section. The first edge heating furnace section includes two groups of first edge heating mechanisms for heating the strip edges. The two groups of first edge heating mechanisms are respectively arranged on the drive side and the operation side of the furnace body; the first longitudinal magnetic induction heating furnace section and the transverse magnetic induction heating furnace section are used to heat the strip in sequence, and the first edge heating furnace section is used to supplement heat to the strip edge temperature difference area generated by the combined heating of longitudinal magnetic induction heating and transverse magnetic induction heating; The first edge heating mechanism includes a first edge electromagnetic induction heater arranged on the corresponding side of the furnace body and a first magnetic shielding structure for controlling the magnetic field distribution and intensity of the first edge electromagnetic induction heater; the first edge electromagnetic induction heater is configured with a moving trolley for driving it to approach or move away from the strip running channel; if the first magnetic shielding structure is a static shield, the first edge electromagnetic induction heater is driven to move to heat different edge width ranges of the strip or adapt to the heating operation of strips with different width specifications; if the first magnetic shielding structure is a dynamic shield and can adjust the constrained magnetic field width and / or magnetic field direction, then in combination with the movement of the first edge electromagnetic induction heater, the magnetic field heating area is jointly controlled.

2. The strip tempering treatment system according to claim 1, wherein: Both between the quenching cooling section and the temperature straightening device and between the temperature straightening device and the tempering heating section are connected by strip conveying roller tables, so that the strip tempering treatment system constitutes a continuous tempering treatment line.

3. The strip tempering treatment system according to claim 1, characterized in that: The quenching cooling section includes a plurality of cooling boxes arranged in sequence along the strip running direction. An intermediate tension roller is provided between adjacent two cooling boxes, and a cooling mechanism is provided in the cooling box.

4. The strip tempering treatment system according to claim 1, characterized in that: The tempering heating section further includes a second edge heating furnace section, which is arranged between the second longitudinal magnetic induction heating furnace section and the second soaking furnace section. The second edge heating furnace section includes two groups of second edge heating mechanisms for heating the strip edges. The two groups of second edge heating mechanisms are respectively arranged on the drive side and the operation side of the furnace body.

5. The strip tempering treatment system according to claim 4, wherein: The second edge heating mechanism includes a second edge electromagnetic induction heater arranged on the corresponding side of the furnace body and a second magnetic shielding structure for controlling the magnetic field distribution and intensity of the second edge electromagnetic induction heater.

6. The strip tempering treatment system according to claim 4, characterized in that: The tempering and cooling section includes a circulating gas jet cooling furnace section, which is integrally connected and communicated with the second soaking furnace section, and the circulating gas jet cooling furnace section adopts a nitrogen jet cooling mechanism.

7. The strip tempering treatment system according to claim 6, characterized in that: The cooling mechanism configured in the tempering and cooling section further includes a low-temperature cooling mechanism, and the low-temperature cooling mechanism adopts an air jet cooling mechanism and / or a water spray cooling mechanism.

8. The strip tempering treatment system according to claim 1, wherein: Both the first soaking furnace section and the second soaking furnace section are configured with electric radiant heating tubes.

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