CN212713685U - Strip steel quenching and tempering system - Google Patents
Strip steel quenching and tempering system Download PDFInfo
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- CN212713685U CN212713685U CN202021886328.5U CN202021886328U CN212713685U CN 212713685 U CN212713685 U CN 212713685U CN 202021886328 U CN202021886328 U CN 202021886328U CN 212713685 U CN212713685 U CN 212713685U
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Abstract
The utility model relates to a strip steel quenching and tempering system, which comprises a strip steel quenching device and a strip steel tempering device, wherein in the strip steel quenching device, a quenching heating section comprises a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section and a first soaking furnace section which are sequentially arranged along the running direction of strip steel; in the strip steel tempering device, the tempering heating section comprises a second longitudinal magnetic induction heating furnace section and a second soaking furnace section which are sequentially arranged along the running direction of the strip steel; a temperature straightening device is arranged between the quenching cooling section and the tempering heating section. The rapid quenching and temperature rise of the strip steel are realized by adopting an induction heating mode, the austenitizing critical temperature and the cementite dissolution temperature can be increased, and the austenitizing and carbide dissolution time is reduced; the induction heating mode is adopted to realize the rapid tempering of the strip steel to the tempering temperature, so that the heat preservation time can be shortened, and the carbide precipitated in the steel is thinner; therefore, finer structure and carbide precipitation can be obtained, and the strip steel has better impact toughness and strength and is particularly favorable for the production of high-strength steel.
Description
Technical Field
The utility model relates to a belted steel quenching and tempering system.
Background
The strip steel quality can be adjusted to a great extent by quenching and tempering treatment, the strip steel has good strength, plasticity and toughness and good comprehensive mechanical properties, and is an important production means for obtaining high-quality strip steel products, in particular to the production of high-strength steel.
The strip steel quenching and tempering is a double treatment process of strip steel quenching and tempering and strip steel tempering, the current strip steel quenching furnace and strip steel tempering furnace mainly adopt a gas heating mode, and the gas heating mode has the limitations of low temperature rise rate, limited maximum heating temperature of a radiant tube and the like, so that the furnace sections of the conventional quenching furnace and the conventional tempering furnace are very long, and the productivity is not high; meanwhile, the rapid heating process cannot be realized, so that high-quality strip steel products cannot be obtained or the strip steel products have large fluctuation. Patent CN 101831530A discloses a heat treatment process for improving comprehensive mechanical properties of low-alloy high-strength steel, in the method, a martensite structure is refined through 3-6 times of circulating quenching and tempering processes, so that the strength of the steel is improved, but the method needs heating and cooling for many times, and is large in energy consumption and long in production period. Patent CN01117018.2 discloses a transverse magnetic line induction heating device with variable magnetic circuit width, and patent CN201410011044.4 discloses a wide-width induction heating device for uniformly heating strip steel, which are all used in strip steel annealing furnaces and have the problems of poor temperature uniformity and plate shape control.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a strip steel quenching and tempering system, can solve prior art's partial defect at least.
The utility model relates to a strip steel quenching and tempering system, which comprises a strip steel quenching device and a strip steel tempering device,
the strip steel quenching device comprises a quenching heating section and a quenching cooling section which are sequentially arranged along the running direction of strip steel, wherein the quenching heating section comprises a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section and a first soaking furnace section which are sequentially arranged along the running direction of the strip steel;
the strip steel tempering device comprises a tempering heating section and a tempering cooling section which are sequentially arranged along the running direction of the strip steel, wherein the tempering heating section comprises a second longitudinal magnetic induction heating furnace section and a second soaking furnace section which are sequentially arranged along the running direction of the strip steel;
and a temperature straightening device is arranged between the quenching cooling section and the tempering heating section.
In one embodiment, the quenching cooling section and the temperature correcting device, and the temperature correcting device and the tempering heating section are connected by a strip steel transfer table, and the strip steel thermal refining system is configured as a continuous thermal refining line.
As one embodiment, the quenching heating section further comprises a first edge heating furnace section, the first edge heating furnace section is arranged between the transverse magnetic induction heating furnace section and the first soaking furnace section, the first edge heating furnace section comprises two groups of first edge heating mechanisms for heating the edge of the strip steel, and the two groups of first edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
As one embodiment, the first edge heating mechanism includes a first edge electromagnetic induction heater disposed on a side corresponding to the furnace body, and a first magnetic shielding structure for controlling a magnetic field distribution and intensity of the first edge electromagnetic induction heater.
As one embodiment, the quenching cooling section comprises a plurality of cooling boxes which are sequentially arranged along the running direction of the strip steel, an intermediate tension roller is arranged between every two adjacent cooling boxes, and a cooling mechanism is arranged in each cooling box.
As one of the implementation modes, the tempering heating section further comprises a second edge heating furnace section, the second edge heating furnace section is arranged between the second longitudinal magnetic induction heating furnace section and the second soaking furnace section, the second edge heating furnace section comprises two groups of second edge heating mechanisms for heating the edges of the strip steel, and the two groups of second edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
As one embodiment, the second side heating mechanism includes a second side electromagnetic induction heater disposed at a side corresponding to the furnace body, and a second magnetic shielding structure for controlling a magnetic field distribution and intensity of the second side electromagnetic induction heater.
In one embodiment, the tempering and cooling section comprises 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 a nitrogen injection cooling mechanism is adopted in the circulating gas injection cooling furnace section.
In one embodiment, the cooling mechanism of the tempering cooling section configuration further comprises a low-temperature cooling mechanism, and the low-temperature cooling mechanism adopts an air-blowing cooling mechanism and/or a water-spraying cooling mechanism.
In one embodiment, electric radiant-heating pipes are disposed in both the first soaking furnace section and the second soaking furnace section.
The utility model discloses following beneficial effect has at least:
the utility model provides a belted steel quenching and tempering processing system adopts the induction heating mode to realize belted steel rapid quenching and heating up, improves austenitizing critical temperature Ac3 and cementite dissolution temperature Acc through improving the quenching heating rate, reduces austenitizing and carbide dissolution time simultaneously; the rapid tempering of the strip steel to the tempering temperature is realized by adopting an induction heating mode, and the heat preservation time is shortened by improving the tempering speed, so that carbides precipitated in the steel are thinner; compared with the traditional strip steel quenching and tempering treatment, the utility model can obtain finer tissue and carbide precipitation, so that the strip steel has better impact toughness and strength, and is particularly favorable for the production of high-strength steel. The temperature straightening device is arranged between the strip steel quenching device and the strip steel tempering device, so that the strip steel after quenching can be straightened and leveled into a plate shape, the tempering and tempering quality of the subsequent strip steel can be improved, and the final strip steel tempering and tempering quality can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a layout of a strip steel conditioning system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a quenching cooling apparatus according to an embodiment of the present invention;
fig. 3 is a schematic view of an operating state of the cooling mechanism according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a strip steel quenching and tempering system, including a strip steel quenching device and a strip steel tempering device, where the strip steel quenching device includes a quenching heating section and a quenching cooling section 17 sequentially arranged along a strip steel running direction, and 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 sequentially arranged along the strip steel running direction; the strip steel tempering device comprises a tempering heating section and a tempering cooling section which are sequentially arranged along the running direction of the strip steel, wherein the tempering heating section comprises a second longitudinal magnetic induction heating furnace section 32 and a second soaking furnace section 34 which are sequentially arranged along the running direction of the strip steel; a temperature straightening device 2 is arranged between the quenching cooling section 17 and the tempering heating section.
The first longitudinal magnetic induction heating furnace section 12 may adopt a longitudinal magnetic induction heating device conventional in the art, and the transverse magnetic induction heating furnace section 13 may adopt a transverse magnetic induction heating device conventional in the art, for example, a "transverse magnetic line induction heating device with a variable magnetic circuit width" disclosed in CN01117018.2, for example, a "wide-width induction heating device for uniformly heating strip steel" disclosed in CN201410011044.4, and specific structures thereof are not described herein again. In the embodiment, in the first longitudinal magnetic induction heating furnace section 12, a power supply system adopts a 10khz power frequency IGBT power supply technology, an inductor adopts a single-turn whole-plate induction coil technology, specifically, cavity sealing is realized through a muffle furnace structure in the inductor coil, and a cavity sealing device adopts a double-layer sealing sleeve structure technology; in the above-mentioned transverse magnetic induction heating furnace section 13, power supply system chooses for use 1khz power frequency IGBT power technology, and the inductor adopts multiturn induction coil technique, specifically realizes the cavity through the muffle furnace structure in the inductor coil and seals, and cavity sealing device adopts double-deck seal cover structure technique. Preferably, in the first longitudinal magnetic induction heating furnace section 12, the temperature of the strip steel is rapidly increased from the normal temperature to 700 ℃, so that the rapid heating is realized and the higher comprehensive thermal efficiency is ensured; in the transverse magnetic induction heating furnace section 13, the strip steel is heated from 700 ℃ to 950 ℃, and the quick and efficient heating after the Curie temperature point is realized.
The first soaking furnace section 15 can heat and equalize the temperature of the quenched and heated strip steel, so that austenitization and heat preservation of the strip steel are realized, the performance of the strip steel is effectively improved, and the consistency of the performance of the strip steel is promoted; preferably, an electric radiation heating pipe is arranged in the first soaking pit section 15, and a good soaking and heat preservation effect can be achieved by adopting an electric radiation pipe heating technology; the electromagnetic induction heating technology and the electric radiant tube heating technology are adopted to realize rapid quenching heating and heat preservation soaking, the length of a quenching heating furnace section can be greatly reduced, the length of the furnace section above 1/2 is saved, and intensive short-flow production is realized. Further preferably, a circulating fan for enhancing disturbance of furnace gas is arranged in the first soaking furnace section 15, so that temperature uniformity in the furnace section can be improved, and operating energy consumption is reduced.
Similarly, the second longitudinal magnetic induction heating furnace section 32 may adopt a longitudinal magnetic induction heating device which is conventional in the art, and the detailed structure thereof is not described herein. In this embodiment, in the magnetic induction heating furnace section 32 is indulged to above-mentioned second, 10khz power frequency IGBT power technology is chooseed for use to electrical power generating system, and the inductor adopts single circle whole board induction coil technique, specifically realizes the cavity through the muffle furnace structure in the inductor coil and seals, and cavity sealing device adopts double-deck seal cover structure technique. The second longitudinal magnetic induction heating furnace section 32 can realize rapid tempering heating of the strip steel before 700 ℃, and particularly can realize low-temperature tempering (150-250 ℃), medium-temperature tempering (350-500 ℃) and high-temperature tempering (650-700 ℃) according to tempering process requirements.
The second soaking furnace section 34 can heat and homogenize the tempered strip steel, and improve the uniformity of the organization and carbide precipitation in the width direction of the strip steel, thereby improving the performance uniformity of strip steel products. Preferably, an electric radiation heating pipe is arranged in the second soaking pit section 34, and a good soaking and heat preservation effect can be achieved by adopting an electric radiation pipe heating technology; the electromagnetic induction heating technology and the electric radiant tube heating technology are adopted to realize rapid tempering heating and heat preservation soaking, the length of a tempering heating furnace section can be greatly reduced, the length of the furnace section above 1/2 is saved, and intensive short-flow production is realized. Further preferably, a circulating fan for enhancing disturbance of furnace gas is further arranged in the second soaking furnace section 34, so that temperature uniformity in the furnace section can be improved, and operating energy consumption is reduced.
The temperature straightening device 2 can straighten and level the plate shape of the quenched strip steel, can reduce the deformation of the strip steel, particularly high-strength steel, in the quenching and cooling process, controls the shape of the strip steel entering a tempering heating furnace, and can reduce the temperature rise amplitude of the subsequent tempering heating furnace section and reduce the energy consumption. Preferably, the straightening temperature of the temperature straightening device 2 is controlled to be 100-300 ℃. The quality of subsequent tempering and tempering of the strip steel can be improved, and the further deterioration of the poor plate shape in the tempering and tempering process can be avoided, so that the final tempering and tempering quality of the strip steel is improved. 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 shape of the quenched steel strip can be straightened and leveled from a 20I level to a 10I level.
Further preferably, the quenching cooling section 17 and the temperature correcting device 2, and the temperature correcting device 2 and the tempering heating section are connected through a strip steel roller conveyor, so that the strip steel quenching and tempering system is a continuous quenching and tempering line, and the efficiency and the yield of strip steel quenching and tempering can be remarkably improved.
Further optimize above-mentioned belted steel guenching unit, the quenching heating section still includes first edge heating furnace section 14, first edge heating furnace section 14 arrange in transverse magnetic induction heating furnace section 13 with between the first soaking pit section 15, first edge heating furnace section 14 includes two sets of first edge heating mechanism that are used for carrying out the heating to belted steel limit portion, and two sets of first edge heating mechanism lists in furnace body transmission side and operation side respectively. By arranging the first edge heating furnace section 14 behind the first longitudinal magnetic induction heating furnace section 12 and the transverse magnetic induction heating furnace section 13, the edge temperature difference area of the strip steel generated by the combined heating of longitudinal magnetic induction heating and transverse magnetic induction heating can be supplemented with heat, so that the condition of non-uniformity of the temperature in the width direction of the strip steel is reduced or avoided, the quenching quality of the strip steel is obviously improved, the uniform precipitation consistency of the tissue and carbide in the width direction of the strip steel is improved, and the performance consistency of the product in the width direction is ensured.
The first edge heating mechanism preferably also adopts an electromagnetic induction heating technology, and specifically, the first edge heating mechanism includes a first edge electromagnetic induction heater disposed on the side corresponding to 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 phenomenon that the edge of the strip steel is overheated can be avoided through the first magnetic shielding structure. In one embodiment, the first magnetic shielding structure comprises 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 running direction of the strip steel, and obviously, the first shielding copper plate is arranged at a position which enables the magnetic field of the first edge electromagnetic induction heater to act on the edge area to be heated of the strip steel. In a preferred embodiment, the magnetic field width constrained by the first magnetic shielding structure is 20 to 60mm, preferably about 50mm, and can better cover the temperature difference region at the edge of the strip steel. In an alternative, the first edge electromagnetic induction heater may be driven by a moving trolley to be close to or far from a strip steel running channel, so as to switch the first edge electromagnetic induction heater between a working state and a standby state, and adjust a target magnetic field acting position of the first edge electromagnetic induction heater according to a specific working condition, wherein: if the first magnetic shielding structure is static shielding, different edge width ranges of strip steel can be heated by driving the first edge electromagnetic induction heater to move, or strip steel heating operation with different width specifications can be adapted; if the first magnetic shielding structure is dynamic shielding, the width and/or direction of the constrained magnetic field can be adjusted, and the movement of the first edge electromagnetic induction heater is combined, so that the magnetic field heating area can be controlled more accurately, and the heating uniformity effect of the edge of the strip steel is improved.
Referring to fig. 1, an inlet seal chamber 11 is provided at the inlet side of the furnace body of the strip quenching apparatus, and outlet seal chambers 16 are provided at the outlet side of the furnace body, so as to ensure the stability of the temperature field in the furnace.
Further optimize above-mentioned belted steel tempering installation, the tempering heating section still includes second limit portion heating furnace section 33, second limit portion heating furnace section 33 arrange in the second indulges magnetic induction heating furnace section 32 with between the second soaking pit section 34, second limit portion heating furnace section 33 includes two sets of second limit portion heating mechanism that are used for heating belted steel limit portion, and two sets of second limit portion heating mechanism divide and list in furnace body transmission side and operation side. By arranging the second edge heating furnace section 33 behind the second longitudinal magnetic induction heating furnace section 32, the edge temperature difference region of the strip steel generated by longitudinal magnetic induction heating can be heated, so that the condition of temperature nonuniformity in the width direction of the strip steel is reduced or avoided, the tempering and tempering quality of the strip steel is obviously improved, the uniform precipitation consistency of the hot-rolled or cold-rolled strip steel in the width direction tissue and carbide is improved, and the performance consistency of the product in the width direction is ensured. Similarly, the second side heating mechanism includes a second side electromagnetic induction heater disposed on the side corresponding to 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 phenomenon that the edge of the strip steel is overheated can be avoided through the second magnetic shielding structure. In one embodiment, the second magnetic shielding structure comprises 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 running direction of the strip steel, and obviously, the second shielding copper plate is arranged at a position which enables the magnetic field of the second side electromagnetic induction heater to act on the area of the to-be-heated side of the strip steel. In a preferred embodiment, the width of the magnetic field confined by the second magnetic shielding structure is 20 to 60mm, preferably about 50mm, and the magnetic field can better cover the temperature difference area at the edge of the strip steel. In an optional scheme, the second edge electromagnetic induction heater may be driven by a moving trolley to be close to or far from the strip steel running channel, so as to switch the second edge electromagnetic induction heater between the working state and the standby state, and adjust a target magnetic field acting position of the second edge electromagnetic induction heater according to a specific working condition, wherein: if the second magnetic shielding structure is static shielding, different edge width ranges of the strip steel can be heated by driving the second edge electromagnetic induction heater to move, or the strip steel heating operation with different width specifications can be adapted; if the second magnetic shielding structure is a dynamic shielding structure, the width and/or direction of the constrained magnetic field can be adjusted, and the movement of the second edge electromagnetic induction heater is combined, so that the magnetic field heating area can be controlled more accurately, and the heating uniformity effect of the edge of the strip steel is improved.
In the strip steel quenching and tempering system, the first longitudinal magnetic induction heating furnace section 12, the transverse magnetic induction heating furnace section 13, the first side heating furnace section 14, the second longitudinal magnetic induction heating furnace section 32 and the second side heating furnace section 33 are all in muffle furnace structure to realize cavity sealing, so that the strip steel is subjected to induction heating in a protective atmosphere in the sealed cavity. In one preferred scheme, the muffle furnace structure comprises a support layer and a flexible double-layer sealing sleeve, wherein the support layer can adopt a SIC (silicon carbide) support layer or a stainless steel water-cooling pipe support layer, the support layer can be protected by a heat-resistant layer, and the heat-resistant layer can adopt heat-resistant cotton and/or a heat-resistant blanket layer; above-mentioned flexible double-deck seal cover includes the inlayer cover body and the outer cover body, wherein, the above-mentioned supporting layer of the inlayer cover body accessible supports, forms first level leakproofness protection through this inlayer cover body, avoids the protective gas in the muffle furnace to leak, and belted steel is heated in this inlayer cover is internal to walk through promptly, and the outer cover body cover is established outside the inlayer cover body, encloses to establish between the two and lets in protective gas in the interlayer cavity of formation and realize the malleation protection in order to form second level leakproofness protection, and protective gas leaks in the suppression stove through the malleation mode. The muffle furnace adopting the double-layer sealing sleeve structure can obviously improve the heating effect and the operation safety of the strip steel.
The strip steel tempering device is further optimized, the tempering and cooling section comprises a circulating gas injection cooling furnace section 35, and the circulating gas injection cooling furnace section 35 is integrally connected and communicated with the second soaking furnace section 34; the circulating gas injection cooling furnace section 35 preferably adopts a nitrogen injection cooling mechanism. The circulating gas injection cooling mechanism is characterized in that hot gas after cooling the strip steel in the device is pumped out by a circulating fan, is cooled by a heat exchanger and then becomes cold gas, and the cold gas is sprayed to the upper surface and the lower surface of the strip steel by the circulating fan at a certain pressure. The increase of the oxidation layer of the strip steel can be thoroughly avoided by a nitrogen circulating injection mode. The temperature of the strip steel can be rapidly cooled to 500 ℃ by the circulating gas injection cooling furnace section 35; because the circulating gas injection cooling furnace section 35 and the second soaking furnace section 34 are integrally connected and conducted, namely the circulating gas injection cooling furnace section 35 and the tempering heating section are combined into an integral furnace, the tightness and consistency of atmosphere protection in the process from tempering heating to nitrogen gas circulating injection of the strip steel can be ensured, no newly added strip steel oxide layer is generated in the medium-high temperature tempering state, the tempering surface quality and the yield of the strip steel are improved, and the compactness of a strip steel tempering device can be further improved. Similarly, as shown in fig. 1, an inlet sealing chamber 31 is arranged at the inlet side of the furnace body of the strip steel tempering device, and outlet sealing chambers 36 are arranged at the outlet sides of the furnace body to ensure the stability of the temperature field in the furnace; the circulating gas injection cooling furnace section 35 is sealed by the outlet side sealing chamber 36 of the furnace body, so that the number of sealing devices can be reduced, and the cost of the device can be reduced. Further preferably, as shown in fig. 1, the cooling mechanism of the tempering and cooling section further includes a low-temperature cooling mechanism 37, the low-temperature cooling mechanism 37 is preferably located outside the furnace, and the low-temperature cooling mechanism 37 adopts an air-blowing cooling mechanism and/or a water-spraying cooling mechanism to cool the strip steel from about 500 ℃ to the normal temperature.
In the above-described quenching apparatus for a strip steel, it is preferable to adopt the following cooling scheme:
as shown in fig. 2, a quenching cooling apparatus is provided, which comprises a plurality of cooling boxes 171 arranged in sequence along the running direction of the strip steel, an intermediate tension roller 173 is arranged between two adjacent cooling boxes 171, a wringing roller 174 is arranged at the outlet side of the tail end cooling box 171, and a quenching cooling mechanism 172 is arranged in the cooling boxes 171; the quenching cooling mechanism 172 may be at least one of a spray cooling mechanism, an aerosol cooling mechanism, and a water spray cooling mechanism. Optionally, an inlet pinch roll 175 for pinching the strip steel for stable cooling is disposed at an inlet side of the head end cooling tank 171; it will be understood that a roller conveyor is arranged in each cooling box 171 to support the strip.
The tension control of the strip steel operation can be realized through the middle tension roller 173, the strip steel plate shape can be well controlled, and the large plate shape change caused by quenching and cooling is avoided, so that the strip steel quality and the product performance are improved. The intermediate tension rollers 173 are preferably provided with at least two groups to realize tension subsection control, and can correspondingly control the tension according to the quenching and cooling process of the strip steel, so that the strip shape of the strip steel is better controlled; the number of the cooling boxes 171 is preferably not less than three. Further, the intermediate tension roller 173 is driven by a variable frequency motor; in an alternative embodiment, the intermediate tension roller 173 includes an upper movable roller and a lower fixed roller, and the upper movable roller is driven to move up and down by a driving device such as a hydraulic cylinder, so that a gap between the intermediate tension roller 173 can be adjusted as desired.
The wringing roller 174 can partially remove the residual cooling water on the surface of the strip steel, the wringing roller 174 is conventional equipment in the metallurgical field, and the specific structure is not described herein. Further, as shown in fig. 2, a drying unit 176 is arranged at the outlet side of the wringing roller 174, so that residual water stains on the surface of the strip steel can be further removed, and the surface quality of the strip steel is ensured; the drying unit 176 may be used for drying with hot air, and for example, includes a drying box and a hot air supply pipe disposed on the drying box.
As can be understood, if the quenching cooling mechanism 172 adopts an aerosol cooling mechanism, the aerosol cooling mechanism includes an aerosol cooling nozzle 1721, 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, the quenching cooling mechanism includes a water spray nozzle, and cooling water can form atomized water under the mechanical action. The atomized cooling medium is used for cooling the strip steel, the cooling effect on the strip steel is good, the quenching cooling parameters such as the quenching cooling rate and the final cooling temperature of the strip steel are easy to control, so that good strip steel quality and shape are obtained, the requirements of continuous quenching or isothermal quenching of the strip steel can be well met, and particularly the production of thin-specification strip steel is realized. Wherein, the control of the speed and the final cooling temperature of the strip steel cold area can be controlled by accurately controlling the amount of cooling water, the cooling time and the like.
In this embodiment, preferably, a mist cooling mechanism is used, and the atomization effect of the cooling water is good. As shown in fig. 2, a mist discharge pipe 177 is provided on the cooling tank 171, and the gas medium in the cooling tank 171 is pumped away by the action of the induced draft fan; a gas-water separation device may be provided at the mist discharge port of the cooling tank 171.
Continuing above-mentioned quenching cooling arrangement, quenching cooling body 172 is including arranging in the upper portion cooling unit of belted steel operation passageway top and arranging in the lower part cooling unit of belted steel operation passageway below, upper portion cooling unit with lower part cooling unit all includes along a plurality of cooling nozzle 1721 of belted steel operation passageway width direction interval arrangement, cooling nozzle 1721 adopts aerial fog cooling nozzle 1721 or water smoke nozzle. The upper cooling unit is used for cooling the upper surface of the strip steel, the lower cooling unit is used for cooling the lower surface of the strip steel, and the upper cooling unit and the lower cooling unit are matched to obtain the required cooling rate and the required final cooling temperature of the strip steel and improve the uniformity of strip steel cooling.
In a further preferred scheme, each group of cooling units comprises a middle nozzle for cooling the middle of the strip steel and an edge nozzle for cooling the edge of the strip steel, each middle nozzle of each group of cooling units is arranged on a first medium supply pipe, each edge nozzle of each group of cooling units is arranged on a second medium supply pipe, namely, the middle cooling of the strip steel and the edge cooling of the strip steel are independent from each other, different cooling rates can be adopted for different areas of the strip steel in a targeted manner, the cooling uniformity in the width direction of the strip steel is ensured, so that a good strip steel shape is obtained, and the consumption of the cooling medium can be saved.
Further preferably, as shown in fig. 3, in the upper cooling unit, a first water baffle 1722 is disposed below at least part of the cooling nozzles 1721, at least part of plate bodies of the first water baffle 1722 overlaps with the spraying area of the corresponding cooling nozzles 1721, or at least part of plate bodies of the first water baffle 1722 extends to the spraying path of the corresponding cooling nozzles 1721, on one hand, the spraying range of the cooling nozzles 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 steel conditions, and on the other hand, the cooling width of the upper cooling unit can be adjusted to meet the quenching cooling requirements of strip steels with different widths. It will be appreciated that the first water deflector 1722 described above is provided for the edge nozzles, particularly the outermost edge nozzles. Furthermore, the overlapping area of at least part of the first water baffle 1722 and the spraying area corresponding to the cooling nozzle 1721 can be designed to be adjustable, and the adjusting effect on the cooling effect and/or the cooling width of the upper cooling unit is better; in one embodiment, the first water baffle 1722 is configured with a lifting driving unit, for example, a linear driving device such as an air cylinder drives the first water baffle 1722 to lift, so as to adjust the shielding area of the cooling nozzle 1721 by the first water baffle 1722.
Further preferably, as shown in fig. 3, the first water baffles 1722 are trough-shaped plates with two wide sides and a low middle, so that the cooling water blocked by the first water baffles 1722 can be prevented from dripping onto the surface of the strip steel again, and the first water baffles 1722 of the trough shape can drain and recover the blocked cooling water.
Similarly, the water retaining structure may also be adopted in the lower cooling unit to achieve adjustment of the cooling effect and/or the cooling width of the lower cooling unit, that is, a second water retaining plate 1723 is arranged above at least part of the cooling nozzles 1721, and at least part of the plate body of the second water retaining plate 1723 overlaps with the spraying area of the corresponding cooling nozzle 1721. The second water baffle 1723 can be fixedly installed or movably installed.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A strip steel quenching and tempering system comprises a strip steel quenching device and a strip steel tempering device, and is characterized in that:
the strip steel quenching device comprises a quenching heating section and a quenching cooling section which are sequentially arranged along the running direction of strip steel, wherein the quenching heating section comprises a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section and a first soaking furnace section which are sequentially arranged along the running direction of the strip steel;
the strip steel tempering device comprises a tempering heating section and a tempering cooling section which are sequentially arranged along the running direction of the strip steel, wherein the tempering heating section comprises a second longitudinal magnetic induction heating furnace section and a second soaking furnace section which are sequentially arranged along the running direction of the strip steel;
and a temperature straightening device is arranged between the quenching cooling section and the tempering heating section.
2. The strip steel conditioning system of claim 1, characterized by: the quenching cooling section and the temperature correcting device and the tempering heating section are connected through a strip steel conveying roller way, so that the strip steel quenching and tempering system is a continuous quenching and tempering line.
3. The strip steel conditioning system of claim 1, characterized by: the quenching heating section further comprises a first edge heating furnace section, the first edge heating furnace section is arranged between the transverse magnetic induction heating furnace section and the first soaking furnace section, the first edge heating furnace section comprises two sets of first edge heating mechanisms used for heating the edge of the strip steel, and the two sets of first edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
4. The strip steel conditioning system of claim 3, characterized by: the first edge heating mechanism comprises a first edge electromagnetic induction heater arranged on the corresponding side of the furnace body and a first magnetic shielding structure used for controlling the magnetic field distribution and intensity of the first edge electromagnetic induction heater.
5. The strip steel conditioning system of claim 1, characterized by: the quenching cooling section comprises a plurality of cooling boxes which are sequentially arranged along the running direction of the strip steel, a middle tension roller is arranged between every two adjacent cooling boxes, and a cooling mechanism is arranged in each cooling box.
6. The strip steel conditioning system of claim 1, characterized by: the tempering heating section further comprises a second edge heating furnace section, the second edge heating furnace section is arranged between the second longitudinal magnetic induction heating furnace section and the second soaking furnace section, the second edge heating furnace section comprises two groups of second edge heating mechanisms used for heating the edges of the strip steel, and the two groups of second edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
7. The strip steel conditioning system of claim 6, characterized by: the second side heating mechanism comprises a second side electromagnetic induction heater arranged on the corresponding side of the furnace body and a second magnetic shielding structure used for controlling the magnetic field distribution and the intensity of the second side electromagnetic induction heater.
8. The strip steel conditioning system of claim 6, characterized by: the tempering cooling section comprises 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 a nitrogen injection cooling mechanism is adopted in the circulating gas injection cooling furnace section.
9. The strip steel conditioning system of claim 8, wherein: the cooling mechanism of tempering cooling section configuration still includes the cryogenic cooling mechanism, cryogenic cooling mechanism adopts air jetting cooling mechanism and/or water to spray cooling mechanism.
10. The strip steel conditioning system of claim 1, characterized by: and the first soaking pit section and the second soaking pit section are both provided with electric radiation heating pipes.
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| CN202021886328.5U CN212713685U (en) | 2020-09-02 | 2020-09-02 | Strip steel quenching and tempering system |
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| CN202021886328.5U CN212713685U (en) | 2020-09-02 | 2020-09-02 | Strip steel quenching and tempering system |
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