CN113976647A - Ultrafast cooling device for hot rolling of extra-thick plate - Google Patents
Ultrafast cooling device for hot rolling of extra-thick plate Download PDFInfo
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- CN113976647A CN113976647A CN202111243395.4A CN202111243395A CN113976647A CN 113976647 A CN113976647 A CN 113976647A CN 202111243395 A CN202111243395 A CN 202111243395A CN 113976647 A CN113976647 A CN 113976647A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
Abstract
The invention discloses an ultra-fast cooling device for hot rolling of an ultra-thick plate, belongs to the technical field of steel rolling processes, and solves the problems that ultra-fast cooling is carried out only by cooling water, the cooling is uneven in the thickness range, an aerosol cooling production line is long, and the cooling speed is slow, so that the requirement of ultra-fast cooling cannot be met in the prior art. The ultra-fast cooling device comprises a moving rack and a nozzle assembly arranged on the moving rack in at least one direction; the nozzle assembly comprises a plurality of groups of nozzles, the nozzles are provided with an aerial fog mode and a cooling water mode, and at least one group of nozzles in the plurality of groups of nozzles is in the aerial fog mode; in the moving direction of the moving stage, the first set of nozzles is in the cooling water mode. The ultra-fast cooling device can be used for ultra-fast cooling of hot-rolled extra-thick plates.
Description
Technical Field
The invention belongs to the technical field of steel rolling processes, and particularly relates to an ultra-fast cooling device for hot rolling of an extra-thick plate.
Background
At present, various countries in the world generally adopt a laminar flow, aerial fog or Ultra Fast Cooling (UFC) Cooling method to perform controlled Cooling after rolling, so as to improve the strength of a steel plate.
The ultra-fast cooling device mainly comprises a high-level water tank, a header group, a baffle roller (a compression roller or a pinch roller), a side nozzle, an end nozzle, an air wall in front of a coiling machine and a cooling roller way. Compared with the conventional cooling, the ultra-thick plate treated by the ultra-fast cooling device can improve the tensile strength and the yield strength by more than 100 MPa.
However, since the head-to-tail supercooling of the steel plate is a gradual temperature field and the ultrafast cooling area is short, the ideal temperature uniformity cannot be achieved only by switching on and off the cooling water. Meanwhile, due to the adoption of the cylindrical nozzle, the ultra-fast cooling is high in cooling speed but narrow in coverage range, and after the cooling speed of the thick plate reaches a certain value, the core part is slow in cooling due to the limitation of the heating conduction speed, so that uneven cooling in the thickness range is easily caused, and further uneven microstructure and mechanical property and larger residual stress are caused.
The aerosol cooling method can fully play a role of the basic principle that the latent heat of vaporization phase change of water is far higher than the specific heat of water in the cooling of the hot-rolled extra-thick plate, and improve the proportion of vaporization cooling in mixed cooling (including contact heat exchange cooling, film boiling cooling and vaporization cooling of water), thereby achieving the high-efficiency cooling requirement mainly based on the vaporization cooling. Meanwhile, the aerosol cooling method has a wide cooling speed range, and can flexibly arrange and assemble a plurality of aerosol cooling nozzles in a grouping and segmenting manner according to the requirements of different strength grades, different finish rolling temperatures and different cooling speeds of the hot-rolled super-thick plate, so that the cooling speed of the hot-rolled super-thick plate and the temperature difference of the cross section of the hot-rolled super-thick plate are effectively and accurately controlled according to the CCT continuous cooling transformation curve characteristics of the high-strength super-thick plate and the requirements of controlling cooling process parameters, and the microstructure and the mechanical property required by the high-strength super-thick plate are obtained.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide an ultrafast cooling apparatus for hot rolling of an ultra-thick plate, which solves the problems in the prior art that the ultrafast cooling is performed only by cooling water, the cooling within the thickness range is not uniform, the production line is long by means of aerial fog cooling, and the cooling speed is slow, so that the requirement of the ultrafast cooling cannot be met.
The purpose of the invention is mainly realized by the following technical scheme:
the invention provides an ultra-fast cooling device for hot rolling of an extra-thick plate, which comprises a moving rack and a nozzle assembly arranged on at least one direction (such as upper direction, lower direction, left direction and/or right direction) of the moving rack, wherein the nozzle assembly comprises a plurality of groups of nozzles, the nozzles have an aerial fog mode and a cooling water mode, at least one group of nozzles in the plurality of groups of nozzles is in the aerial fog mode, and the initial group of nozzles is in the cooling water mode along the moving direction of the moving rack.
Further, the hot-rolled extra-thick sheet is a hot-rolled sheet having a thickness of 60mm or more.
Furthermore, the hot-rolled super-thick plate has a thickness of 60-120 mm, a width of 50-500 mm and a length of 200-500 mm.
Further, 1-100 groups of nozzles are arranged in each direction of the movable rack, and each group of nozzles comprises 5-300 nozzles.
Further, the distance between two adjacent spraying groups is 30-200 mm.
Further, the ultrafast cooling apparatus for hot rolling an ultra-thick plate further includes a mounting bracket for mounting the nozzle, and the nozzle is mounted on the mounting bracket such that the nozzle is located above, below, left, and/or right of the moving stage.
Further, the mounting bracket is network structure, including a plurality of cross, the nozzle is located on the crosspoint of cross, the cross includes interconnect's vertical pipe and horizontal pipe, the inner wall of horizontal pipe one end is equipped with horizontal slider, the other end of horizontal pipe is equipped with horizontal spout, in every row of cross, but two adjacent horizontal pipes are through horizontal slider and the horizontal spout fixed connection of mutually supporting, the one end inner wall of vertical pipe is equipped with vertical slider, the other end of vertical pipe is equipped with vertical spout, in every row of cross, but two adjacent vertical pipes are through vertical slider and the vertical spout fixed connection of mutually supporting.
Further, the liquid outlet of the nozzle is perpendicular to the plane of the moving rack and the surface of the hot-rolled special thick plate, and the included angle of the nozzle is 90 degrees and perpendicular to each other in the adjacent direction.
Furthermore, the shape of the nozzle is fan-shaped, the nozzle is provided with a plurality of spray holes which are arranged along the radial direction of the nozzle, the number of the spray holes is multiple, the hole diameters of the spray holes are different, the spray holes are arranged along the circumferential direction of the nozzle, and the nozzle is rotatable around the mounting frame.
Further, above-mentioned ultrafast cooling device still includes the rotation driving piece, and the rotation driving piece includes driving motor and intermeshing's first gear and second gear, and driving motor's output shaft and first gear connection, first gear set firmly on the mounting bracket, and the second gear sets firmly on the nozzle. Like this, when the rainfall is adjusted to needs, open driving motor, driving motor's output shaft drive first gear is rotatory, and then drives the second gear rotation for the nozzle rotates around the mounting bracket.
Further, the ultrafast cooling apparatus for hot rolling an ultra-thick plate further includes an air supply unit and a water supply unit respectively communicated with the nozzles.
Further, the gas supply unit comprises an air compressor, a gas storage tank, a gas stop valve, a gas regulating valve, a gas flowmeter (for example, an FT orifice plate flowmeter with a differential pressure transmitter) and a gas distributor which are connected in sequence, wherein a gas outlet of the gas distributor is connected with the nozzle through a gas pipe, and a gas pressure transmitter (for example, a PT pressure transmitter) and a gas pressure gauge (for example, a PI pressure gauge) are arranged on a connecting pipeline of the gas flowmeter and the gas distributor.
Further, the water supply assembly comprises a water storage tank, a water pump, a booster pump, a liquid stop valve, a liquid regulating valve, a liquid flowmeter and a water distributor which are sequentially connected, a water outlet of the water distributor is connected with the nozzle through a water pipe, and a hydraulic transmitter (for example, a PT pressure transmitter) and a liquid pressure gauge (for example, a PI pressure gauge) are arranged on a connecting pipeline of the liquid flowmeter and the liquid distributor.
Further, the mobile platform comprises a platform base body and a moving assembly for driving the platform base body to move, wherein the moving assembly comprises a sliding rail (for example, a linear rail) and a driving member (for example, a driving cylinder provided with a relay), the platform base body is slidably connected with the sliding rail, and the driving member is used for driving the platform base body to slide relative to the sliding rail.
Further, the nozzle is within the range of travel of the slide rail.
Further, the ultrafast cooling device for the hot-rolled extra-thick plate further comprises an infrared thermometer for monitoring the surface temperature of the hot-rolled extra-thick plate and/or a thermocouple thermometer for monitoring the internal temperature of the hot-rolled extra-thick plate.
Further, the number of the thermocouple thermometers is plural, and the thermocouples are used for monitoring the temperature 5mm below the surface, 1/4 and the temperature at the center of the hot-rolled special thick plate respectively.
Further, the acquisition frequency of the infrared thermometer and the thermocouple thermometer was 50 data per second.
Further, the infrared thermometer and the thermocouple thermometer respectively test the surface temperature and the core temperature of the hot-rolled extra-thick plate before the ultra-fast cooling, in the ultra-fast cooling process and after the ultra-fast cooling is stopped, so as to obtain the temperature change data of the surface and the core of the hot-rolled extra-thick plate, and accordingly, the actually measured cooling curve of the surface and the core of the hot-rolled extra-thick plate in the ultra-fast cooling process is drawn.
Further, the ultrafast cooling apparatus for hot rolling of an ultra-thick plate further includes a nozzle control unit for controlling a flow rate of gas and/or liquid in the nozzle and a movement control unit for controlling a moving speed and a moving displacement of the moving stage.
Further, when the ultra-fast cooling device is provided with a gas stop valve, a gas regulating valve, a gas flowmeter, a booster pump, a liquid stop valve, a liquid regulating valve and a liquid flow meter, the gas stop valve, the gas regulating valve, the gas flowmeter, the booster pump, the liquid stop valve, the liquid regulating valve and the liquid flowmeter are all controlled by a Programmable Logic Controller (PLC) and a nozzle control unit.
Further, when a driving part is arranged in the ultra-fast cooling device, the driving part is connected with a mobile control unit through a Programmable Logic Controller (PLC), wherein the mobile control unit comprises a time relay and a displacement relay which are connected with the driving part.
Further, the ultra-fast cooling device also comprises a display connected with the nozzle control unit, the movement control unit, the infrared thermometer and/or the thermocouple thermometer, and the display is used for displaying the flow and the pressure of fluid in the nozzle, the moving speed and the moving displacement of the driving piece, the surface temperature and the internal temperature of the hot-rolled extra-thick plate.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
a) the ultrafast cooling device for the hot-rolled extra-thick plate provided by the invention is provided with the plurality of groups of nozzles, the nozzles are provided with the gas fog mode and the cooling water mode, and at least one group of nozzles in the plurality of groups of nozzles is in the gas fog mode, namely, the ultrafast cooling device provided by the embodiment adopts the combination of water cooling and gas fog cooling to carry out ultrafast cooling on the hot-rolled extra-thick plate, wherein the cooling water can continuously carry out ultrafast cooling on the surface of the hot-rolled extra-thick plate, and the instantaneous cooling speed of the gas fog cooling is higher, so that the ultrafast uniform cooling of the hot-rolled extra-thick plate is realized according to the process requirements, the cooling speed of the hot-rolled extra-thick plate is effectively improved, the surface quality of the hot-rolled extra-thick plate is effectively improved, and the surface is prevented from rusting.
b) In the ultrafast cooling device for the hot-rolled special thick plate, because a certain distance is reserved between the nozzle in the gas fog cooling mode and the nozzle in the cooling water mode, when the hot-rolled special thick plate moves from the nozzle in the gas fog cooling mode to the nozzle in the cooling water mode, a certain time gap is not reserved in a cooling medium, and the temperature can be returned to a certain degree, so that the cooling uniformity of the hot-rolled special thick plate from the surface to the center can be ensured, and the ultrafast cooling process can be really used for the production of the hot-rolled special thick plate.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a perspective view of an ultra-rapid cooling apparatus for hot rolling of an ultra-thick plate according to the present invention;
FIG. 2a is a schematic structural diagram of a gas supply unit in the ultrafast cooling apparatus for hot rolling of an ultra-thick plate according to the present invention;
FIG. 2b is a schematic structural view of a water supply unit in the ultrafast cooling apparatus for hot rolling of an ultra-thick plate according to the present invention;
FIG. 3 is a schematic structural view of a nozzle assembly in an ultrafast cooling apparatus for hot rolling of an ultra-thick plate according to the present invention;
FIG. 4 is a schematic diagram showing the arrangement of a thermocouple thermometer in the ultra-fast cooling apparatus for hot rolling a very thick plate according to the present invention;
FIG. 5 is a schematic structural view of a nozzle in the ultrafast cooling apparatus for hot rolling of an ultra-thick plate according to the present invention;
FIG. 6 is a schematic structural view of a mounting frame in the ultrafast cooling apparatus for hot rolling of an ultra-thick plate according to the present invention;
FIG. 7 is a graph showing temperature drop curves of the surface and the core of a hot-rolled extra-thick plate during an ultra-fast cooling process according to an embodiment of the present invention.
Reference numerals:
1-moving the gantry; 2-a nozzle assembly; 3-longitudinal tube; 4-longitudinal slide block; 5-a longitudinal chute; 6-transverse tube; 7-transverse sliding block; 8-a transverse chute; 9-an air compressor; 10-a gas storage tank; 11-gas shut-off valve; 12-gas regulating valve; 13-a gas flow meter; 14-a gas distributor; 15-a pneumatic transducer; 16-gas pressure gauge; 17-a water storage tank; 18-thermocouple thermometer; 19-liquid pressure gauge; 20-liquid stop valve; 21-liquid regulating valve; 22-a liquid flow meter; 23-a water separator; 24-hydraulic transmitter.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
In order to improve the uniformity of the extra-thick plate, the uniformity of the thick plate is improved while the requirement of quick cooling is met by optimizing different cooling media and cooling paths. At present, the domestic aerosol cooling device is low in cooling speed, an ultra-fast cooling device for uniformly cooling a hot-rolled extra-thick plate does not exist, and the uniform ultra-fast cooling device for the hot-rolled extra-thick plate cannot be provided on site.
The invention provides an ultra-fast cooling device for hot rolling of an extra-thick plate, which comprises a moving rack 1 and a nozzle assembly 2 arranged in at least one direction (for example, upper direction, lower direction, left direction and/or right direction) of the moving rack 1, wherein the nozzle assembly 2 comprises a plurality of groups of nozzles, the nozzles have an air fog mode and a cooling water mode, at least one group of nozzles in the plurality of groups of nozzles is in the air fog mode, and the initial group of nozzles is in the cooling water mode along the moving direction of the moving rack 1, wherein the hot rolling of the extra-thick plate refers to a hot rolling steel plate with the thickness of more than 60 mm.
As for the arrangement mode of the nozzles, 1-100 groups of nozzles can be arranged in each direction of the moving rack 1, each group of nozzles comprises 5-300 nozzles, and the number can be selected according to the width and the length of the hot-rolled super-thick plate.
Taking the example of the nozzle assembly 2 comprising 10 sets of nozzles, one arrangement, for example, set 1, set 3, set 5, set 7 and set 9, is in cooling water mode, and set 2, set 4, set 6, set 8 and set 10 are in aerosol mode, that is, the nozzles in cooling water mode and the nozzles in aerosol mode are arranged alternately; in another arrangement, groups 1, 2, 3, 4, 6, 7, 8 and 9 are in chilled water mode and groups 5 and 10 are in aerosol mode.
It should be noted that, in practical application, the mode of each group of nozzles can be switched as required, so that the nozzles are switched between the aerosol mode and the cooling water mode, and for the specific setting mode, details are not repeated here.
Taking the second arrangement mode as an example, in the implementation, the hot-rolled extra-thick plate is arranged on the movable rack 1, a plurality of groups of nozzles are opened, and the hot-rolled extra-thick plate firstly passes through the 1 st group, the 2 nd group, the 3 rd group and the 4 th group of nozzles to be subjected to cooling water ultra-fast cooling; then, the moving rack 1 moves the hot-rolled extra-thick plate to the fifth group of nozzles, it should be noted that, because a certain distance is reserved between the 4 th group of nozzles and the 5 th group of nozzles, when the hot-rolled extra-thick plate moves to the fifth group of nozzles, the cooling water on the surface of the hot-rolled extra-thick plate is evaporated completely, and the 5 th group of nozzles performs aerosol cooling on the hot-rolled extra-thick plate; during the process that the hot-rolled extra-thick plate moves from the 5 th group to the 6 th group of nozzles, the moisture of the aerial fog on the surface of the hot-rolled extra-thick plate is evaporated, and the temperature return can be carried out for a certain time; the above process is repeated by the nozzles of the 6 th to 10 th groups, thereby completing the ultra-fast cooling of the hot-rolled super-thick plate.
Compared with the prior art, the ultrafast cooling device for the hot-rolled extra-thick plate provided by the invention is provided with the plurality of groups of nozzles, the nozzles are provided with the aerial fog mode and the cooling water mode, and at least one group of nozzles in the plurality of groups of nozzles is in the aerial fog mode, namely, the ultrafast cooling device provided by the embodiment adopts the combination of water cooling and aerial fog cooling to carry out ultrafast cooling on the hot-rolled extra-thick plate, wherein the cooling water can continuously carry out ultrafast cooling on the surface of the hot-rolled extra-thick plate, and the instantaneous cooling speed of the aerial fog cooling is higher, so that the ultrafast uniform cooling of the hot-rolled extra-thick plate is realized according to the process requirements, the cooling speed of the hot-rolled extra-thick plate is effectively increased, the surface quality of the hot-rolled extra-thick plate is effectively improved, and the surface rusting is avoided.
In addition, because a certain distance is reserved between the nozzle in the gas mist cooling mode and the nozzle in the cooling water mode, when the hot-rolled extra-thick plate moves from the nozzle in the gas mist cooling mode to the nozzle in the cooling water mode, a certain time gap is not reserved in the cooling medium, and the temperature can be returned to a certain degree, so that the cooling uniformity of the hot-rolled extra-thick plate from the surface to the core part can be ensured, and the ultra-fast cooling process can be really used for the production of the hot-rolled extra-thick plate.
Through tests, the cooling speed of the ultra-fast cooling device is 100-500 ℃/s, and the temperature difference of the section is controlled to be 200-400 ℃.
Illustratively, the ultra-fast cooling device can be used for hot rolling of extra-thick plates as follows: and heating the hot-rolled extra-thick plate with the thickness of 60-120 mm, the width of 50-500 mm and the length of 200-500 mm by using a box type heating furnace, wherein the soaking temperature is 1000-1200 ℃, and in order to ensure that the extra-thick plate sample is completely austenitized and the temperature in the cross section is uniform, heating to a set temperature and then preserving the heat for 20min to obtain the hot-rolled extra-thick plate.
In order to ensure the cooling effect of the ultra-fast cooling, the cooling time of the ultra-fast cooling device is 0.5-1200 s.
In order to ensure enough time for cooling or temperature return during the movement of the two adjacent groups of nozzles, the distance between the two adjacent groups of nozzles can be controlled between 30-200 mm (for example, 30mm, 56mm, 71mm, 105mm, 143mm, 170mm, 189mm or 200 mm).
It will be appreciated that, in order to ensure stable installation of the nozzle, the above-described ultrafast cooling apparatus for hot rolling of an ultra-thick plate further includes a mounting bracket for mounting the nozzle, the nozzle being mounted on the mounting bracket such that the nozzle is located above, below, to the left and/or to the right of the moving stage 1.
In practical application, the distance between two adjacent spray groups also needs to be properly adjusted in consideration of the difference of hot rolling super-thick plates, so that, for the structure of the mounting frame, in particular, the cross-shaped structure is a reticular structure and comprises a plurality of cross-shaped parts, the nozzles are arranged at the cross points of the cross-shaped parts, the cross-shaped parts comprise a longitudinal pipe 3 and a transverse pipe 6 which are mutually connected, the inner wall of one end of the transverse pipe 6 is provided with a transverse sliding block 7, the other end of the transverse pipe 6 is provided with a transverse sliding chute 8, in each row of cross-shaped parts, two adjacent transverse pipes 6 are fixedly connected in a sliding way through a transverse sliding block 7 and a transverse sliding groove 8 which are mutually matched, similarly, the inner wall of one end of each longitudinal pipe 3 is provided with a longitudinal sliding block 4, the other end of each longitudinal pipe 3 is provided with a longitudinal sliding groove 5, in each row of cross parts, two adjacent longitudinal pipes 3 are connected in a sliding and fixed mode through longitudinal sliding blocks 4 and longitudinal sliding grooves 5 which are matched with each other. In this way, the transverse distance of each row of nozzles can be adjusted by adjusting the relative position of the transverse slide block 7 and the transverse slide groove 8, and the vertical distance of each row of nozzles can be adjusted by adjusting the relative position of the longitudinal slide block 4 and the longitudinal slide groove 5.
In order to ensure the cooling uniformity of the surface of the hot-rolled extra-thick plate, the liquid outlet of the nozzle is vertical to the plane of the moving rack 1, namely vertical to the surface of the hot-rolled extra-thick plate, and the included angle of the nozzle is 90 degrees in the adjacent direction and is vertical to each other, so that the uniform cooling of the hot-rolled extra-thick plate in the width direction and the thickness direction can be ensured.
In practical application, the liquid outlet angle of the nozzle may be adjusted, so that the nozzle is shaped like a sector ring, the nozzle is provided with a plurality of spray holes arranged along the radial direction of the nozzle, the number of the spray holes is multiple, the diameters of the spray holes are different, the spray holes are arranged along the circumferential direction of the nozzle, and the nozzle can rotate around the circumferential direction of the mounting frame. Illustratively, the nozzle is provided with three injection holes, namely a first injection hole, a second injection hole and a third injection hole, wherein the first injection hole, the second injection hole and the third injection hole are arranged along the circumferential direction of the nozzle, and the aperture of the first injection hole, the aperture of the second injection hole and the aperture of the third injection hole are sequentially increased.
It can be understood that, in order to realize that the nozzle is rotatable around mounting bracket circumference, above-mentioned ultrafast cooling device still includes the rotation driving piece, and the rotation driving piece includes driving motor and intermeshing's first gear and second gear, and driving motor's output shaft and first gear connection, first gear set firmly on the mounting bracket, and the second gear sets firmly on the nozzle. Like this, when cooling water or aerial fog are adjusted to needs, open driving motor, driving motor's the first gear of output shaft drive is rotatory, and then drives the second gear rotation for the nozzle rotates around the mounting bracket.
In order to provide cooling water and aerial fog for the nozzle, the ultrafast cooling device for the hot rolling extra-thick plate further comprises an air supply unit and a water supply unit which are respectively communicated with the nozzle, and the nozzle is in a cooling water mode or an aerial fog mode by controlling the communication or disconnection between the air supply unit and the water supply unit and the nozzle, wherein in the cooling water mode, the nozzle is only communicated with the water supply unit, and in the aerial fog mode, the nozzle is simultaneously communicated with the air supply unit and the water supply unit.
As for the structure of the gas supply unit, specifically, it includes an air compressor 9, a gas storage tank 10, a gas stop valve 11, a gas regulating valve 12, a gas flowmeter 13 (for example, an FT orifice flowmeter with a differential pressure transmitter) and a gas distributor 14 which are connected in sequence, the gas outlet of the gas distributor 14 is connected to the nozzle through a gas pipe, and a gas pressure transmitter 15 (for example, a PT pressure transmitter) and a gas pressure gauge 16 (for example, a PI pressure gauge) are provided on the connecting pipe of the gas flowmeter 13 and the gas distributor 14.
For the structure of the water supply assembly, specifically, it includes a water storage 17, a water pump, a booster pump, a liquid stop valve 20, a liquid regulating valve 21, a liquid flow meter 22 and a water separator 23 which are connected in sequence, the water outlet of the water separator 23 is connected with the nozzle through a water pipe, and a hydraulic pressure transmitter 24 (e.g., PT pressure transmitter) and a liquid pressure gauge 19 (e.g., PI pressure gauge) are provided on the connection pipeline of the liquid flow meter 22 and the liquid separator.
In order to realize the mobility of the moving rack 1, for the structure of the moving rack 1, specifically, the moving rack comprises a rack base body and a moving component for driving the rack base body to move, wherein the moving component comprises a slide rail (for example, a linear rail) and a driving component (for example, a driving cylinder provided with a relay), the rack base body is connected with the slide rail in a sliding way, and the driving component is used for driving the rack base body to slide relative to the slide rail, so that the mobility of the moving rack 1 is realized, and the hot-rolled special-thick plates can sequentially pass through a plurality of groups of nozzles.
It should be noted that, in order to ensure that each group of spray nozzles can effectively cool the extra-thick plate for hot rolling, the spray nozzles need to be within the stroke range of the slide rail.
It should be noted that, during the ultra-fast cooling process of the hot-rolled extra-thick plate, the temperature of the surface and the core of the hot-rolled extra-thick plate is critical to the microstructure of the cooled hot-rolled extra-thick plate, and therefore, the ultra-fast cooling apparatus for the hot-rolled extra-thick plate further includes an infrared thermometer for monitoring the surface temperature of the hot-rolled extra-thick plate and/or a thermocouple thermometer 18 for monitoring the internal temperature of the hot-rolled extra-thick plate, wherein the number of the thermocouple thermometers 18 is plural, and the number of the thermocouple thermometers is respectively used for monitoring the temperature 5mm below the surface of the hot-rolled extra-thick plate, the temperature at the thickness 1/4 and the temperature at the center, and the collection frequency of the infrared thermometers and the thermocouple thermometers 18 is 50 data per second.
The infrared thermometer and the thermocouple thermometer 18 can respectively test the temperature of the surface and the core of the hot-rolled extra-thick plate, including the temperature of the surface and the core of the hot-rolled extra-thick plate before the ultra-fast cooling, in the ultra-fast cooling process and after the ultra-fast cooling is stopped, so as to obtain the temperature change data of the surface and the core of the hot-rolled extra-thick plate, and draw the actually measured cooling curves of the surface and the core of the hot-rolled extra-thick plate in the ultra-fast cooling process according to the temperature change data.
In order to realize the automatic control of the ultra-fast cooling apparatus for hot rolling of an ultra-thick plate as described above, it further includes a nozzle control unit for controlling the flow rate of gas and/or liquid in the nozzle and a movement control unit for controlling the moving speed and moving displacement of the moving stage 1. In this way, by controlling different water supply and air supply process parameters (including pressure, flow and the like), adjusting cooling conditions, carrying out various ultra-fast cooling tests on the hot-rolled extra-thick plate at a certain moving speed, testing the temperature change and the cooling speed of the surface and the core of the hot-rolled extra-thick plate, and carrying out microscopic structure and mechanical property inspection test analysis on extra-thick plate samples under different cooling conditions after cooling, thereby obtaining the influence data of the cooling process parameters on the cooling characteristics, the microscopic structure and the mechanical property of the hot-rolled extra-thick plate. The specific cooling path can be automatically regulated according to a continuous cooling transformation curve (CCT curve) of the supercooled austenite.
Specifically, when the ultra-fast cooling device is provided with a gas stop valve 11, a gas regulating valve 12, a gas flow meter 13, a booster pump 19, a liquid stop valve 20, a liquid regulating valve 21 and a liquid flow meter 22, the gas stop valve 11, the gas regulating valve 12, the gas flow meter 13, the booster pump 19, the liquid stop valve 20, the liquid regulating valve 21 and the liquid flow meter 22 are all connected with a nozzle control unit through a Programmable Logic Controller (PLC), and when a driving member is provided in the ultra-fast cooling device, the driving member is connected with a movement control unit through the Programmable Logic Controller (PLC), wherein the movement control unit comprises a time relay and a displacement relay which are connected with the driving member.
In order to ensure that the cooling process of the hot-rolled extra-thick plate can be intuitively known in the cooling process of the hot-rolled extra-thick plate, the ultra-fast cooling device further comprises a display connected with the nozzle control unit, the movement control unit, the infrared thermometer and/or the thermocouple thermometer 18 and used for displaying the flow and the pressure of fluid in the nozzle, the movement speed and the movement displacement of the driving part, the surface temperature and the internal temperature of the hot-rolled extra-thick plate and the like.
Example one
In the specific implementation test, a box-type heating furnace is adopted to heat a hot-rolled extra-thick plate with the thickness of 120mm, the width of 100mm and the length of 200mm, the soaking temperature is 1150 ℃, and in order to ensure that the extra-thick plate sample is completely austenitized and the temperature in the cross section is uniform, the temperature is raised to the set temperature and then is kept for 20 min. After the sample is taken out of the furnace, the sample is placed on an ultra-fast cooling device, wherein the ultra-fast cooling device comprises 6 water-cooling nozzles and 6 aerial fog nozzles, the water-cooling nozzles are arranged alternately at intervals of 30mm, 10 water-cooling nozzles are arranged in each water-cooling module, 10 aerial fog nozzles are arranged in each aerial fog module, alternate cooling water cooling and aerial fog cooling are carried out on the aerial fog nozzles, the cooling temperature is 1000 ℃, and after the sample is sprayed for 120s according to the preset time, the sample is air-cooled on the cooling device. The collected process parameters include water pressure, water amount, air pressure and air amount.
The hot-rolled special thick plate is conveyed to a moving rack by an electric sample rack with a lifting unit, is pushed to an ultra-fast cooling device through an air cylinder, the stay position of the ultra-fast cooling device is controlled by a displacement relay, the cooling time of the ultra-fast cooling device is controlled by a time relay, the cooling time is 120s, the surface temperature of the special thick plate is collected by an infrared thermometer, the collection frequency is 50 data per second, and the collected data is fed back to a control picture of a computer through a PLC module for storage and processing; the thermocouple temperature measuring element collects the temperature of the core part of the extra-thick plate, and the collected data is fed back to the computer for storage and processing through the digital recorder and the PLC module.
Tests show that the fastest cooling speed of the embodiment is 170 ℃/s, the temperature difference of the cross section is controlled to be 300 ℃, the actual measurement curve is shown in figure 7, and figure 7 shows the temperature drop curve and the temperature difference of the cross section of the surface and the core which are cooled for 120s together by water cooling and air mist interval cooling for 10 s.
As can be seen from fig. 7, when the ultrafast cooling device of this embodiment is used to perform ultrafast cooling on a hot-rolled super-thick plate, a cooling effect with a reduced temperature difference of a cross section and uniformity can be obtained, and uniform cooling of the surface and the core of the hot-rolled super-thick plate can be ensured, where it is required to say that the temperature difference of the cross section of the conventional ultrafast cooling is more than 600 ℃.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The ultra-fast cooling device for hot rolling of the extra-thick plate is characterized by comprising a moving rack and a nozzle assembly arranged on the moving rack in at least one direction;
the nozzle assembly comprises a plurality of groups of nozzles, the nozzles have an aerosol mode and a cooling water mode, and at least one group of nozzles in the plurality of groups of nozzles is in the aerosol mode;
in the moving direction of the moving stage, the first set of nozzles is in the cooling water mode.
2. The ultra-rapid cooling apparatus for hot rolling of a super thick plate according to claim 1, further comprising a mounting bracket for mounting the nozzle, the nozzle being mounted on the mounting bracket.
3. An ultra-fast cooling apparatus for hot rolling of extra-thick plates according to claim 1, wherein the liquid outlet of the nozzle is perpendicular to the plane of the moving stage.
4. The ultra-rapid cooling apparatus for hot rolling of an ultra-thick plate according to claim 1, further comprising a gas supply unit and a water supply unit respectively communicating with the nozzles.
5. The ultra-fast cooling device for hot rolling of extra-thick plates according to claim 4, wherein the gas supply unit comprises an air compressor, a gas storage tank, a gas stop valve, a gas regulating valve, a gas flow meter and a gas distributor which are connected in sequence, and a gas outlet of the gas distributor is connected with a nozzle.
6. The ultra-fast cooling device for hot rolling of extra-thick plates according to claim 4, wherein the water supply assembly comprises a water storage tank, a water pump, a booster pump, a liquid stop valve, a liquid regulating valve, a liquid flow meter and a water separator which are connected in sequence, and a water outlet of the water separator is connected with a nozzle.
7. The ultra-fast cooling apparatus for hot rolling of extra-thick plates according to claim 1, wherein the moving stage comprises a stage base and a moving assembly driving the stage base to move.
8. The apparatus of claim 7, wherein the moving assembly comprises a slide rail to which the stage substrate is slidably connected and a driving member for driving the stage substrate to slide relative to the slide rail.
9. The ultra-fast cooling apparatus for hot rolled extra-thick sheet according to claims 1 to 8, further comprising an infrared thermometer for monitoring a surface temperature of the hot rolled extra-thick sheet and/or a thermocouple thermometer for monitoring an internal temperature of the hot rolled extra-thick sheet.
10. The ultra-rapid cooling apparatus for hot rolling of an extra-thick plate according to any one of claims 1 to 8, further comprising a nozzle control unit for controlling the flow rate of gas and/or liquid in the nozzle and a movement control unit for controlling the moving speed and moving displacement of the moving stage.
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