CN113976647B - 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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- CN113976647B CN113976647B CN202111243395.4A CN202111243395A CN113976647B CN 113976647 B CN113976647 B CN 113976647B CN 202111243395 A CN202111243395 A CN 202111243395A CN 113976647 B CN113976647 B CN 113976647B
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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
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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 within a thickness range is uneven, 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, the 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 the steel plate.
The ultra-fast cooling device mainly comprises a high-level water tank, a header group, a baffle roller (a press 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 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 aerial fog 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 is not uniform within the thickness range, the production line is long by means of aerial fog cooling, and the cooling speed is slow, so that the requirement of 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 thickness of the hot-rolled super-thick plate is 60-120 mm, the width is 50-500 mm, and the length is 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 groups of 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.
Furthermore, the mounting rack is of a net structure and comprises a plurality of cross pieces, the nozzles are arranged on cross points of the cross pieces, the cross pieces comprise longitudinal pipes and transverse pipes which are connected with each other, transverse sliders are arranged on the inner walls of one ends of the transverse pipes, transverse chutes are arranged at the other ends of the transverse pipes, in each row of cross pieces, two adjacent transverse pipes are fixedly connected in a sliding mode through the transverse sliders and the transverse chutes which are matched with each other, longitudinal sliders are arranged on the inner walls of one ends of the longitudinal pipes, longitudinal chutes are arranged at the other ends of the longitudinal pipes, and in each row of cross pieces, two adjacent longitudinal pipes are fixedly connected in a sliding mode through the longitudinal sliders and the longitudinal chutes which are matched with each other.
Furthermore, a liquid outlet of the nozzle is perpendicular to the plane of the moving rack and the surface of the hot-rolled extra-thick plate, and in the adjacent direction, the included angle of the nozzle is 90 degrees and the included angle are perpendicular to each other.
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 is still including rotating the driving piece, rotates the driving piece and 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 ultra-fast cooling device for hot rolling the ultra-thick plate further comprises an air supply unit and a water supply unit which are 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 (such as 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 (such as a PT pressure transmitter) and a gas pressure meter (such as a PI pressure meter) 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 piece (for example, a driving cylinder provided with a relay), the platform base body is slidably connected with the sliding rail, and the driving piece 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 ultra-fast cooling device for the hot-rolled ultra-thick plate further comprises an infrared thermometer for monitoring the surface temperature of the hot-rolled ultra-thick plate and/or a thermocouple thermometer for monitoring the internal temperature of the hot-rolled ultra-thick plate.
Further, the number of the thermocouple thermometers is multiple, and the thermocouple thermometers are respectively used for monitoring the temperature of the position 5mm below the surface, 1/4 of the thickness and the center of the hot-rolled special thick plate.
Further, the acquisition frequency of the infrared thermometer and the thermocouple thermometer is 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 ultra-rapid cooling apparatus for hot rolling of a super-thick plate 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 the moving displacement of the moving stage.
Furthermore, 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 connected with a nozzle control unit through a Programmable Logic Controller (PLC).
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 the 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, in which like reference numerals refer to like parts throughout, are for the purpose of illustrating particular embodiments only and are not to be considered limiting of the invention.
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 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 the 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 super-thick plate during an ultrafast cooling process according to an embodiment of the present invention.
Reference numerals:
1-moving a 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-a 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 existing domestic aerosol cooling device is low in cooling speed, an ultra-fast cooling device capable of meeting the requirement of uniform cooling of 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.
For the arrangement of the nozzles, 1 to 100 sets of nozzles may be arranged in each direction of the moving gantry 1, each set of nozzles includes 5 to 300 nozzles, and the number may be selected according to the width and length of the hot-rolled super-thick plate.
Take 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 in cooling water mode, and set 2, set 4, set 6, set 8 and set 10 in aerosol mode, that is, the nozzles in cooling water mode and the nozzles in aerosol mode alternate; 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 needed to switch between the aerosol mode and the cooling water mode, and for the specific setting mode, details are not described herein.
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 a 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 cross section is controlled to be 200-400 ℃.
Illustratively, the ultra-rapid cooling device described above can be used for hot rolling 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 keeping the temperature for 20min after heating to a set temperature in order to ensure that the extra-thick plate sample is completely austenitized and the temperature in the cross section is uniform, thereby obtaining 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 that the cooling or temperature returning is carried out for enough time during the movement of the adjacent two groups of nozzles, the distance between the adjacent two groups of nozzles can be controlled between 30 and 200mm (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, considering that different hot-rolled super-thick plates exist, the distance between two adjacent groups of spray groups also needs to be adjusted appropriately, therefore, for the structure of the mounting frame, specifically, the mounting frame is a net structure and comprises a plurality of cross pieces, the spray nozzles are arranged at the intersection points of the cross pieces, each cross piece comprises a longitudinal pipe 3 and a transverse pipe 6 which are connected with each other, the inner wall of one end of each transverse pipe 6 is provided with a transverse sliding block 7, the other end of each transverse pipe 6 is provided with a transverse sliding groove 8, in each row of cross pieces, two adjacent transverse pipes 6 are connected with each other in a sliding and fixed mode through the transverse sliding blocks 7 and the transverse sliding grooves 8 which are matched with each other, 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, and in each row of cross pieces, two adjacent longitudinal pipes 3 are connected with each other in a sliding and fixed mode through the longitudinal sliding blocks 4 and the longitudinal sliding grooves 5 which are matched with each other. Thus, 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 perpendicular to the plane of the moving table frame 1, namely perpendicular to the surface of the hot-rolled extra-thick plate, and the included angle of the nozzle in the adjacent directions is 90 degrees and perpendicular 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 as 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 plurality of spray holes are different, the plurality of 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 shutoff valve 11, a gas regulating valve 12, a gas flow meter 13 (for example, an FT orifice plate flow meter with a differential pressure transmitter), and a gas distributor 14 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 connection pipe of the gas flow meter 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 gantry 1, for the structure of the moving gantry 1, specifically, the moving gantry 1 includes a gantry base body and a moving assembly for driving the gantry base body to move, wherein the moving assembly includes a slide rail (e.g., a linear rail) and a driving member (e.g., a driving cylinder provided with a relay), the gantry base body is slidably connected with the slide rail, and the driving member is used for driving the gantry base body to slide relative to the slide rail, so that the mobility of the moving gantry 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 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 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 at the position 5mm below the surface of the hot-rolled extra-thick plate, at the position of 1/4 of the thickness and at the center of the hot-rolled extra-thick plate, and the acquisition 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 achieve the above-described automatic control of the ultra-rapid cooling apparatus for hot rolling of a super-thick plate, it further comprises 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 the temperature is kept for 20min after the temperature is raised to the set temperature in order to ensure that the extra-thick plate sample is completely austenitized and the temperature in the cross section is uniform. 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 super-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 stop 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 super-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 ℃.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (9)
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;
the distance between two adjacent spraying groups is 30 to 200mm;
the mounting rack is used for mounting the nozzle, and the nozzle is mounted on the mounting rack; the mounting frame is of a net structure and comprises a plurality of cross pieces, the nozzles are arranged at the cross points of the cross pieces, the cross pieces comprise longitudinal pipes and transverse pipes which are mutually connected, a transverse sliding block is arranged on the inner wall of one end of each transverse pipe, a transverse sliding groove is arranged at the other end of each transverse pipe, every two adjacent transverse pipes in each row of cross pieces are fixedly connected in a sliding mode through the transverse sliding blocks and the transverse sliding grooves which are mutually matched, a longitudinal sliding block is arranged on the inner wall of one end of each longitudinal pipe, a longitudinal sliding groove is arranged at the other end of each longitudinal pipe, and every two adjacent longitudinal pipes in each row of cross pieces are fixedly connected in a sliding mode through the longitudinal sliding blocks and the longitudinal sliding grooves which are mutually matched;
the nozzle is in a fan-shaped ring shape, 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 aperture of the spray holes is different, the spray holes are arranged along the circumferential direction of the nozzle, and the nozzle can rotate around the mounting frame.
2. An ultra-rapid cooling apparatus for hot rolling of slabs of extra-thick as claimed in claim 1, wherein the outlet of said nozzle is perpendicular to the plane of the moving stage.
3. 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.
4. The ultra-fast cooling device for hot rolling of extra-thick plates according to claim 3, 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.
5. The ultra-fast cooling device for hot rolling of ultra-thick plates according to claim 3, wherein the water supply unit 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.
6. 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.
7. The ultra-fast cooling apparatus for hot rolling of extra-thick plates according to claim 6, wherein the moving assembly comprises a slide rail to which the stage base is slidably connected and a driving member for driving the stage base to slide relative to the slide rail.
8. The ultra-fast cooling apparatus for hot rolled extra-thick sheet according to any one of claims 1 to 7, 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.
9. The ultra-rapid cooling apparatus for hot rolling of an extra-thick plate according to any one of claims 1 to 7, 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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