CN113649417A - Aluminum casting and rolling efficient cooling device and cooling process - Google Patents
Aluminum casting and rolling efficient cooling device and cooling process Download PDFInfo
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- CN113649417A CN113649417A CN202111014311.XA CN202111014311A CN113649417A CN 113649417 A CN113649417 A CN 113649417A CN 202111014311 A CN202111014311 A CN 202111014311A CN 113649417 A CN113649417 A CN 113649417A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 86
- 238000005266 casting Methods 0.000 title claims abstract description 72
- 238000001816 cooling Methods 0.000 title claims abstract description 52
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 35
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 198
- 239000007788 liquid Substances 0.000 claims abstract description 115
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 100
- 239000010439 graphite Substances 0.000 claims abstract description 65
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000002156 mixing Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000839 emulsion Substances 0.000 claims abstract description 32
- 238000005507 spraying Methods 0.000 claims abstract description 32
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 70
- 239000006200 vaporizer Substances 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 239000000047 product Substances 0.000 claims 1
- 239000013589 supplement Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 239000000498 cooling water Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000003405 preventing effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/10—Liquid materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
Abstract
The invention discloses an efficient cooling device and a cooling process for aluminum casting and rolling. The device comprises a graphite and liquid nitrogen mixing device, a spraying device and a control device with manual and automatic control modes; the spray coating device comprises: the nozzle comprises an upper nozzle, an upper nozzle base, a lower nozzle and a lower nozzle base; graphite and compounding device of liquid nitrogen includes: a nano graphite feeder, a mixing box and a liquid nitrogen source; finally, the upper nozzle collects one path of nitrogen and one path of liquid nitrogen graphite emulsion, the lower nozzle also collects one path of nitrogen and one path of liquid nitrogen graphite emulsion, and a water baffle is arranged for receiving condensed water on the outer wall of a pipeline related to liquid nitrogen. The device can be matched with a new process, and metal circulation is accelerated on the premise of ensuring the surface quality of a cast-rolling plate.
Description
Technical Field
The invention belongs to the technical field of aluminum cast-rolling production, and particularly relates to an aluminum cast-rolling efficient cooling device and a cooling process.
Background
As is known, aluminum casting and rolling are a production process for directly rolling and forming a metal melt by using two rotary casting rollers with a water cooling system as crystallizers, wherein the temperature of the metal melt before rolling is generally controlled to be 680-710 ℃, cooling water in the rollers needs to continuously take away heat in the continuous rolling process to reduce the surface temperature of the rollers and maintain a heat balance state, aluminum liquid is in direct contact with the surfaces of the casting rollers, the rollers are easy to stick, and a lubricating medium needs to be sprayed on the surfaces of the casting rollers to avoid the sticking of the rollers, so that the plate surface quality is ensured. The conventional roller surface is sprayed with graphite emulsion matched with compressed air, only the roller adhesion preventing effect is achieved, the effect on reducing the surface temperature of the roller is small, in addition, the graphite emulsion is divided into water-based graphite emulsion and other solvent graphite emulsion, at present, the other solvent graphite emulsion is a chemical solvent, and the problems that the graphite emulsion is easy to dry and solidify after being used and the like often exist, so the water-based graphite emulsion is mostly used in the aluminum casting and rolling industry with higher requirements on the surface of a cast-rolled plate.
Currently, with the increasing competition of aluminum processing markets, the profits of aluminum processing enterprises are continuously reduced, the cost reduction and efficiency improvement are inevitable choices for the continuous development of enterprises, and the improvement of the rolling speed and the improvement of the metal flow rotation speed are effective ways.
The casting and rolling speed is increased, and the new heat balance can be achieved only by taking away more heat by a roller water cooling system, namely, the cooling strength is improved, so that the normal production state is maintained. The performance of the water system efficiency has a great relationship with the equipment and the environmental temperature, and particularly in summer, the cooling water temperature is high. At present, most casting and rolling manufacturers start with the reduction of the temperature of cooling water, reduce the surface temperature of a roller and improve the casting and rolling efficiency, and because equipment is fixed, the potential for improving the efficiency of a water system is limited unless investment is modified or water system equipment is updated.
When a cast-rolling product is unloaded from a production line, the surface temperature is about 120 ℃, the temperature needs to be reduced to below 60 ℃, the product can be processed in the next cold rolling procedure, and the product needs to be cooled for more than 3 days from the cast-rolling lower line to the upper cold rolling machine, so that the product has large stock and the metal flow rotation speed is slow.
Through search, the invention patent of application No. CN202010345905.8 discloses a casting roll cooling device for continuously casting and rolling aluminum plates. This technical scheme has improved heat radiation structure, can realize water-cooling and forced air cooling inter combination through the improvement, and can also link the jet-propelled cooling that realizes intermittent type formula. Firstly, the spray pipe is connected with the water inlet pipe, the water inlet pipe is connected with an external water pump, and after water flows enter the water inlet pipe, the roller main body and the spray pipe jointly form a dual cooling structure, so that the cooling efficiency is improved; secondly, when the upper die-casting roller structure rotates, on one hand, the rotating shaft is provided with the gear B, the gear B is meshed with the gear A, and when the upper die-casting roller structure rotates, the rotating shaft and the radiating blades are in a rotating state, so that wind power radiation can be realized; on the other hand, the top end face of the elastic gas cylinder is in contact with the shifting arm, and when the shifting arm rotates along with the roller main body, the elastic gas cylinder is in an extrusion state, so that intermittent air injection cooling of the roller main body can be realized. The air cooling device is mainly characterized in that an air cooling means is added to improve the cooling effect.
The invention patent of application number CN201710604928.4 discloses a vertical casting and rolling process and a vertical casting and rolling device for aluminum alloy. The device comprises a casting roller, a pinch roller, a graphite stop block and a water spray cooling device. The casting rollers are arranged oppositely, cooling water is introduced into each casting roller, the water spray cooling device is arranged below the space between the two casting rollers and positioned at two sides of a slab discharging, and a water spray nozzle of the water spray cooling device faces to the position of a slab outlet and is used for spraying cooling water to the surface of the slab at the outlet of a casting and rolling area, so that the solidification sequence of melt is changed into horizontal solidification from the front end of the casting and rolling area to the back, and the surface sale and central strip-shaped deflection of the slab are avoided. The method mainly aims to solve the problem of serious macroscopic deflection in cast-rolling slabs caused by huge temperature ranges of two phase regions in the cast-rolling production process, changes the solidification sequence of melts in a cast-rolling region by using a water spray cooling method at an outlet of the cast-rolling region, changes the solidification sequence from the surface of the slab to the center in the traditional cast-rolling method into horizontal solidification from the front end of the cast-rolling region to the back, effectively avoids the surface and center strip segregation of the slab, and does not provide a method which is beneficial to improving the metal flow rotation speed.
The invention patent of application number CN201310708024.8 discloses a method for producing ultra-wide cast-rolled aluminum foil blanks at high speed. The method indicates that when the vertical plate is cast and rolled, after a casting roller rotates by the circumference of 1/3 rollers, the roller surface of the casting roller is lubricated by using the double-spray gun graphite emulsion, and a grain refiner is added, so that the grain refining effect is obviously improved, and the grain size is more uniform. The technical scheme only uses the graphite emulsion part as a lubricant, and is not helpful for increasing the metal flow rotation speed.
The invention patent of application number CN200810030569.7 discloses a process for producing 5052 alloy by electrolytic aluminum liquid short-flow casting rolling. The process indicates that graphite emulsion with the mass concentration of 1-3% is used for lubricating the interface of a casting roller during casting and rolling, and the 5052 alloy is prevented from being stuck to the roller. The technical scheme also has the problem that only the graphite emulsion is used as a lubricant, and is obviously difficult to help metal high-speed flow.
Disclosure of Invention
In order to solve the problems in the background art, the invention firstly provides an aluminum casting and rolling efficient cooling device and secondly provides an aluminum casting and rolling efficient cooling process.
An efficient cooling device for cast-rolling of aluminum is used for the cast-rolling process of cast-rolling plates, wherein an upper cast roller and a lower cast roller are used for cast-rolling of the cast-rolling plates in the cast-rolling process, and the efficient cooling device comprises a graphite and liquid nitrogen mixing device, a spraying device and a control device with manual and automatic control modes.
The spray coating device comprises: an upper nozzle capable of adjusting a pitch angle, an upper nozzle base capable of moving in parallel to the axial direction of the upper casting roll, a lower nozzle capable of adjusting a pitch angle, and a lower nozzle base capable of moving in parallel to the axial direction of the lower casting roll; the upper nozzle is positioned above the cast-rolling plate, arranged on the upper nozzle base and aligned with the upper casting roller, and the lower nozzle is positioned below the cast-rolling plate, arranged below the lower nozzle base and aligned with the lower casting roller.
Graphite and compounding device of liquid nitrogen includes: nano graphite blanking device, mixing box and liquid nitrogen source.
Wherein, a graphite blanking regulating valve is connected behind the nano graphite blanking device and then connected into a mixing box; the mixing box is also provided with a control device and a liquid level meter with a high-low liquid level alarm function; the bottom of the mixing box is provided with two pipelines, the first pipeline is sequentially provided with a metering pump A, a pressure gauge A, an adjusting valve A and a flowmeter A, then is connected with a section of upper nozzle emulsion elastic pipe and is finally connected to an upper nozzle of the spraying device, the second pipeline at the bottom of the mixing box is sequentially provided with a metering pump B, a pressure gauge B, an adjusting valve B and a flowmeter B, then is connected with a section of lower nozzle emulsion elastic pipe and is finally connected to a lower nozzle of the spraying device; the mixing box is also provided with a stirrer for stirring and mixing materials; the bottom of the side wall of the mixing box is also provided with a liquid outlet.
The outlet of the liquid nitrogen source is divided into two paths, the first path is connected to the graphite discharging regulating valve through a regulating valve C, a metering pump C is connected to the graphite discharging regulating valve, the second path is connected to the vaporizer after a liquid nitrogen vaporizer feeds the metering pump, the vaporizer is electrically heated, the outlet of the vaporizer is divided into two paths of pipelines, a pressure gauge D, a regulating valve D and a flow meter D are sequentially connected to the first path of outlet pipeline of the vaporizer, then an upper nozzle nitrogen elastic pipe is connected to the first path of outlet pipeline of the vaporizer, and finally the upper nozzle nitrogen elastic pipe is connected to the spraying device.
In the whole device, all the regulating valves and the metering pumps are electrically connected with the control device.
Furthermore, the bottom of the upper nozzle base is provided with a water baffle for receiving the emulsion elastic tube of the upper nozzle, the nitrogen elastic tube of the upper nozzle and the condensed water on the outer wall of the upper nozzle; the length of the water baffle along the axial direction of the upper casting roller is more than or equal to that of the upper casting roller, and the water baffle is used for catching water drops in air condensed on the outer wall of the upper nozzle and ensuring the quality of the surface of the casting and rolling plate.
Furthermore, the liquid nitrogen source is also provided with a third path of outlet, and the third path of outlet is sequentially connected with a metering pump F, a pressure gauge F, an adjusting valve F and a flow meter F, then is connected with a section of plate surface nozzle liquid nitrogen elastic pipe, and finally is connected with the plate surface nozzle; the plate surface nozzle is arranged on the lower nozzle base, is positioned below the cast-rolling plate and is aligned to the bottom surface of the cast-rolling plate.
Furthermore, the bottom surface of the mixing box is also provided with a plurality of ultrasonic transmitters for fully mixing the nano graphite with the liquid nitrogen.
Furthermore, a branch is arranged on a pipeline between the emulsion elastic tube of the upper nozzle and the flowmeter A and is connected between the nitrogen elastic tube of the upper nozzle and the flowmeter D through a regulating valve G; a branch is arranged on a pipeline between the emulsion elastic tube of the lower nozzle and the flowmeter B and is connected between the nitrogen elastic tube of the lower nozzle and the flowmeter E through a regulating valve H.
Furthermore, in the device, all pipelines through which liquid nitrogen or nitrogen flows and the outer wall of the container are of a double-layer structure which is vacuumized between layers and used for preventing operators from being frostbitten. The related equipment and pipelines comprise a liquid nitrogen source, a pipeline for conveying liquid nitrogen, and a pipeline for conveying cold nitrogen after a vaporizer.
An aluminum casting and rolling high-efficiency cooling process using the aluminum casting and rolling high-efficiency cooling device of claim 1, comprising the following steps of:
a. the pipelines are cleaned before production, so that the smoothness of each pipeline is ensured.
b. After the alloy grade, the rolling speed and the product specification to be produced are input through the control device, the device is in a standby state; the liquid-solid ratio is input through the control device, automatic proportioning is carried out, liquid nitrogen is added into the mixing box from a liquid nitrogen source through a metering pump C, nano graphite is added into the mixing box through a nano graphite feeder, and meanwhile, the stirrer is automatically started, and when a liquid level meter of the mixing box sends a high liquid level alarm, the automatic stopping is carried out for feeding materials into the mixing box.
c. During production, the control device is in an automatic control mode, and the upper nozzle, the lower nozzle and the plate surface nozzle are respectively used for spraying the lower surfaces of the upper casting roller, the lower casting roller and the casting and rolling plate.
d. After production is finished, the device is stopped and blown, and finally the device is emptied, so that the accuracy of the liquid-solid ratio is ensured when next burdening is carried out.
Wherein, the particle size of the used nano graphite is less than or equal to 1 μm, and the purity of the liquid nitrogen is more than or equal to 99 percent.
Further, the specific operation of step a is as follows:
a1. before production, firstly, the control device is powered on, the manual control mode is switched to, the liquid level meter of the mixing box sends out low liquid level alarm, the metering pump C is started through the control device, and when the low liquid level alarm is eliminated, the metering pump C is stopped.
a2. And opening the regulating valve A and the regulating valve B through the control device, starting the metering pump A and the metering pump B, purging until liquid nitrogen in the mixing box is completely sprayed, then stopping the metering pump A and the metering pump B, and closing the regulating valve A and the regulating valve B.
a3. And opening the regulating valve D and the regulating valve E through the control device, starting the liquid nitrogen vaporizer feeding metering pump, stopping the liquid nitrogen vaporizer feeding metering pump after confirming that the gas circuit is unblocked, and closing the regulating valve D and the regulating valve E.
Further, in the step c, when the liquid level meter sends out a low liquid level alarm, liquid nitrogen and nano graphite are automatically supplemented into the mixing box from a liquid nitrogen source and a nano graphite feeder according to a liquid-solid ratio, wherein the rate of supplementing the liquid nitrogen and the nano graphite is greater than the spraying rate of the upper nozzle, the lower nozzle and the plate surface nozzle, and when the liquid level meter sends out a high liquid level alarm, the material supplementing is automatically stopped; in addition, during spraying, the upper nozzle base and the lower nozzle base continuously perform scanning movement, so that the spraying range covers the length range of the upper casting roller and the lower casting roller.
Further, in the step D, after production is completed, the switching control device is in a manual control mode, firstly, the metering pump A, the metering pump B and the metering pump F are stopped, the regulating valve F is closed, then the regulating valve G and the regulating valve H are opened, nitrogen purging is carried out for 1 minute, then, the feeding metering pump of the liquid nitrogen vaporizer is stopped, the regulating valve D, the regulating valve E, the regulating valve G and the regulating valve H are closed, a liquid discharge port is opened, and residual liquid in the mixing box is emptied.
Compared with the prior art, the invention has the beneficial effects that: 1. the nano-graphite feeder and the liquid nitrogen source are used for mixing the nano-graphite with liquid nitrogen to prepare liquid nitrogen graphite emulsion, and the upper casting roller and the lower casting roller are efficiently cooled by spraying of the upper nozzle and the lower nozzle, so that the cooling rate can be greatly improved, and the high-speed circulation of metal is adapted; 2. the nano graphite sprayed by the upper and lower nozzles is substantially wrapped by low-temperature nitrogen, on one hand, the nano graphite is more uniformly distributed and is not easy to gather because the nano graphite is wrapped by the low-temperature nitrogen with stronger fluidity and on the other hand, the low-temperature nitrogen can realize cold air cooling, has a cold energy source and fluidity, has obvious advantages compared with pure water cooling or water cooling and air cooling, and can avoid the emulsion proportion change caused by large water content of compressed air when the traditional compressed air is used for spraying in a matched manner, thereby avoiding the influence on the quality of a cast-rolled plate; 3. since the liquid nitrogen does not react with the aluminum below 800 ℃, the cast-rolled plate is directly sprayed by the liquid nitrogen, so that the cast-rolled plate can be cooled on the premise of ensuring the product quality, and the metal circulation is accelerated; 4. the elastic hose is used, so that the upper nozzle base and the lower nozzle base are not affected when moving.
Drawings
FIG. 1: a partial schematic view of an aluminum casting and rolling high-efficiency cooling device.
FIG. 2: a partial schematic view of an aluminum casting and rolling high-efficiency cooling device.
In the figure: 1.1. nano graphite blanking device, 1.2 graphite blanking regulating valve, 1.3 stirrer, 1.4 mixing box, 1.5 liquid level meter, 1.6 ultrasonic emitter, 1.7 liquid outlet, 1.8 upper nozzle emulsion elastic tube, 1.9 lower nozzle emulsion elastic tube, 2.1 liquid nitrogen source, 2.2 liquid nitrogen vaporizer feeding metering pump, 2.3 vaporizer, 2.4 upper nozzle nitrogen elastic tube, 2.5 lower nozzle nitrogen elastic tube, 2.6 plate surface nozzle liquid nitrogen elastic tube, 3 control device, 4.1 upper nozzle, 4.2 lower nozzle, 4.3 plate surface nozzle, 5.1 upper casting roller and 5.2 lower casting roller.
Detailed Description
The present invention is explained, but not limited to, and the technical solutions obtained in the light of the idea of the present invention should be included in the scope of protection of the present patent.
Example one
As shown in figures 1 and 2, the high-efficiency cooling device for the cast rolling of the aluminum cast rolling plate is used for the cast rolling process of the cast rolling plate, wherein an upper cast roller 5.1 and a lower cast roller 5.2 are used in the cast rolling process, and the high-efficiency cooling device for the cast rolling of the aluminum cast rolling plate comprises a graphite and liquid nitrogen mixing device, a spraying device and a control device 3 with manual and automatic control modes.
The spray coating device comprises: an upper nozzle 4.1 capable of adjusting a pitch angle, an upper nozzle base capable of moving in parallel with the axial direction of an upper casting roller 5.1, a lower nozzle 4.2 capable of adjusting a pitch angle, and a lower nozzle base capable of moving in parallel with the axial direction of a lower casting roller 5.2; the upper nozzle 4.1 is located above the cast-rolling slab, is arranged on the upper nozzle base and is aligned with the upper casting roll 5.1, and the lower nozzle 4.2 is located below the cast-rolling slab, is arranged below the lower nozzle base and is aligned with the lower casting roll 5.2. The bottom of the upper nozzle base is provided with a water baffle for receiving condensed water on the outer walls of an upper nozzle emulsion elastic pipe 1.8, an upper nozzle nitrogen elastic pipe 2.4 and an upper nozzle 4.1; the length of the water baffle along the axial direction of the upper casting roller 5.1 is more than or equal to the length of the upper casting roller 5.1.
Graphite and compounding device of liquid nitrogen includes: nano-graphite blanking device 1.1, mixing box 1.4, liquid nitrogen source 2.1.
Wherein, a graphite blanking regulating valve 1.2 is connected behind the nano graphite blanking device 1.1, and then the nano graphite blanking device is connected into a mixing box 1.4; the mixing box 1.4 is also provided with a control device 3 and a liquid level meter 1.5 with a high-low liquid level alarm function; the bottom of the mixing box 1.4 is provided with two pipelines, the first pipeline is sequentially provided with a metering pump A, a pressure gauge A, an adjusting valve A and a flow meter A, then is connected with an upper nozzle emulsion elastic pipe 1.8 and finally is connected to an upper nozzle 4.1 of a spraying device, the second pipeline at the bottom of the mixing box 1.4 is sequentially provided with a metering pump B, a pressure gauge B, an adjusting valve B and a flow meter B, then is connected with a lower nozzle emulsion elastic pipe 1.9 and finally is sprayed and connected to a lower nozzle 4.2 of the device; the mixing box 1.4 is also provided with a stirrer 1.3 for stirring and mixing materials; the bottom of the side wall of the mixing box 1.4 is also provided with a liquid outlet 1.7. The bottom surface of the mixing box 1.4 is also provided with a plurality of ultrasonic transmitters 1.6.
The outlet of the liquid nitrogen source 2.1 is divided into two paths, the first path is connected to the graphite blanking regulating valve 1.2 through the regulating valve C and the metering pump C, the second path is connected to the vaporizer 2.3 after passing through the liquid nitrogen vaporizer feeding metering pump 2.2, the outlet of the vaporizer 2.3 is divided into two paths of pipelines, the outlet pipeline of the first path of the vaporizer 2.3 is sequentially connected with the pressure gauge D, the regulating valve D and the flow meter D, then is connected with the upper nozzle nitrogen elastic pipe 2.4, and finally is connected to the upper nozzle 4.1 of the spraying device, the outlet pipeline of the second path of the vaporizer 2.3 is sequentially connected with the pressure gauge E, the regulating valve E and the flow meter E, then is connected with the lower nozzle nitrogen elastic pipe 2.5, and finally is connected to the lower nozzle 4.2 of the spraying device; the liquid nitrogen source 2.1 is also provided with a third outlet, and the third outlet is sequentially connected with a metering pump F, a pressure gauge F, a regulating valve F and a flow meter F, then connected with a section of plate surface nozzle liquid nitrogen elastic pipe 2.6 and finally connected with a plate surface nozzle 4.3; the plate surface nozzle 4.3 is arranged on the upper surface of the lower nozzle base, is positioned below the cast-rolling plate and is aligned with the bottom surface of the cast-rolling plate.
A branch is arranged on a pipeline between the emulsion elastic tube 1.8 of the upper nozzle and the flowmeter A and is connected between the nitrogen elastic tube 2.4 of the upper nozzle and the flowmeter D through a regulating valve G; a branch is arranged on a pipeline between the lower nozzle emulsion elastic tube 1.9 and the flowmeter B and is connected between the lower nozzle nitrogen elastic tube 2.5 and the flowmeter E through a regulating valve H.
In the whole device, all regulating valves and metering pumps are electrically connected with the control device 3. In the device, the pipeline through which liquid nitrogen or nitrogen flows and the outer wall of the container are both of a double-layer structure with interlayer vacuum pumping.
An aluminum casting-rolling efficient cooling process comprises the following steps:
a. a1. before production, the control device 3 is powered on and switched to a manual control mode, the liquid level meter 1.5 of the mixing box 1.4 gives out low liquid level alarm, the control device 3 starts the metering pump C, and the metering pump C is stopped after the low liquid level alarm is eliminated; a2. opening the regulating valve A and the regulating valve B through the control device 3, starting the metering pump A and the metering pump B, purging until liquid nitrogen in the mixing box 1.4 is completely sprayed, then stopping the metering pump A and the metering pump B, and closing the regulating valve A and the regulating valve B; a3. and opening the regulating valve D and the regulating valve E through the control device 3, starting the liquid nitrogen vaporizer feeding metering pump 2.2, stopping the liquid nitrogen vaporizer feeding metering pump 2.2 after the smoothness of the gas circuit is confirmed, and closing the regulating valve D and the regulating valve E.
b. After the alloy grade, the rolling speed and the product specification to be produced are input through the control device 3, the device is in a standby state; inputting a liquid-solid ratio through a control device 3, automatically batching, adding liquid nitrogen from a liquid-nitrogen source 2.1 into a mixing box 1.4 through a metering pump C, adding nano graphite into the mixing box 1.4 through a nano graphite feeder 1.1, simultaneously automatically starting a stirrer 1.3, and automatically stopping feeding into the mixing box 1.4 when a liquid level meter 1.5 of the mixing box 1.4 sends a high liquid level alarm;
c. during production, the control device 3 is in an automatic control mode, and the upper nozzle 4.1, the lower nozzle 4.2 and the plate surface nozzle 4.3 are respectively used for spraying the upper casting roller 5.1, the lower casting roller 5.2 and the lower surface of a casting and rolling plate; when the liquid level meter 1.5 sends out a low liquid level alarm, liquid nitrogen and nano graphite are automatically supplemented into the mixing box 1.4 from a liquid nitrogen source 2.1 and a nano graphite feeder 1.1 according to a liquid-solid ratio, the rate of supplementing the liquid nitrogen and the nano graphite is greater than the spraying rates of an upper nozzle 4.1, a lower nozzle 4.2 and a plate surface nozzle 4.3, and when the liquid level meter 1.5 sends out a high liquid level alarm, the material supplementing is automatically stopped; in addition, during spraying, the upper nozzle base and the lower nozzle base are continuously moved in a scanning manner, so that the spraying range covers the length ranges of the upper casting roll 5.1 and the lower casting roll 5.2.
d. After production is complete, the apparatus is stopped and purged, and finally the apparatus is emptied. Specifically, after production is completed, the switching control device 3 is in a manual control mode, firstly, the metering pump a, the metering pump B and the metering pump F are stopped, the regulating valve F is closed, then the regulating valve G and the regulating valve H are opened, nitrogen purging is performed for 1 minute, then, the feeding metering pump 2.2 of the liquid nitrogen vaporizer is stopped, the regulating valve D, the regulating valve E, the regulating valve G and the regulating valve H are closed, the liquid discharge port 1.7 is opened, and residual liquid in the mixing box 1.4 is emptied.
Wherein, the particle size of the used nano graphite is less than or equal to 1 μm, and the purity of the liquid nitrogen is more than or equal to 99 percent.
Claims (10)
1. The utility model provides an aluminium cast rolling high-efficient cooling device for cast rolling process of cast rolling board, wherein, use upper casting roll (5.1), lower casting roll (5.2) cast rolling board in the cast rolling process, its characterized in that: comprises a graphite and liquid nitrogen mixing device, a spraying device and a control device (3) with manual and automatic control modes;
the spray coating device comprises: the device comprises an upper nozzle (4.1) capable of adjusting a pitch angle, an upper nozzle base capable of moving in parallel with the axial direction of an upper casting roller (5.1), a lower nozzle (4.2) capable of adjusting a pitch angle, and a lower nozzle base capable of moving in parallel with the axial direction of a lower casting roller (5.2); the upper nozzle (4.1) is positioned above the cast-rolling plate, arranged on the upper nozzle base and aligned to the upper cast-rolling roller (5.1), and the lower nozzle (4.2) is positioned below the cast-rolling plate, arranged below the lower nozzle base and aligned to the lower cast-rolling roller (5.2);
graphite and compounding device of liquid nitrogen includes: a nano graphite feeder (1.1), a mixing box (1.4) and a liquid nitrogen source (2.1);
wherein, a graphite blanking regulating valve (1.2) is connected behind the nano graphite blanking device (1.1), and then the nano graphite blanking device is connected into a mixing box (1.4); the mixing box (1.4) is also provided with a control device (3) and a liquid level meter (1.5) with a high-low liquid level alarm function; the bottom of the mixing box (1.4) is provided with two pipelines, the first pipeline is sequentially provided with a metering pump A, a pressure gauge A, a regulating valve A and a flow meter A, then is connected with an upper nozzle emulsion elastic pipe (1.8) and finally is connected to an upper nozzle (4.1) of the spraying device, the second pipeline at the bottom of the mixing box (1.4) is sequentially provided with a metering pump B, a pressure gauge B, a regulating valve B and a flow meter B, then is connected with a lower nozzle emulsion elastic pipe (1.9) and finally is connected to a lower nozzle (4.2) of the spraying device; the mixing box (1.4) is also provided with a stirrer (1.3) for stirring and mixing materials; a liquid outlet (1.7) is also arranged at the bottom of the side wall of the mixing box (1.4);
the outlet of the liquid nitrogen source (2.1) is divided into two paths, the first path is connected to a graphite blanking regulating valve (1.2) through a regulating valve C and a metering pump C, the second path is connected to a vaporizer (2.3) after passing through a liquid nitrogen vaporizer feeding metering pump (2.2), the outlet of the vaporizer (2.3) is divided into two paths of pipelines, a pressure gauge D, a regulating valve D and a flow meter D are sequentially connected to the outlet pipeline of the first path of the vaporizer (2.3), then an upper nozzle nitrogen elastic pipe (2.4) is connected, finally the upper nozzle is connected to an upper nozzle (4.1) of a spraying device, a pressure gauge E, a regulating valve E and a flow meter E are sequentially connected to the outlet pipeline of the second path of the vaporizer (2.3), then a lower nozzle nitrogen elastic pipe (2.5) is connected, and finally the lower nozzle is connected to the lower nozzle (4.2) of the spraying device;
in the whole device, all regulating valves and metering pumps are electrically connected with the control device (3).
2. The aluminum casting-rolling efficient cooling device of claim 1, characterized in that: the bottom of the upper nozzle base is provided with a water baffle for receiving the condensed water on the outer walls of the upper nozzle emulsion elastic pipe (1.8), the upper nozzle nitrogen elastic pipe (2.4) and the upper nozzle (4.1); the length of the water baffle along the axial direction of the upper casting roller (5.1) is more than or equal to the length of the upper casting roller (5.1).
3. The aluminum casting-rolling efficient cooling device of claim 1, characterized in that: the liquid nitrogen source (2.1) is also provided with a third outlet, and the third outlet is sequentially connected with a metering pump F, a pressure gauge F, a regulating valve F and a flow meter F, then connected with a section of plate surface nozzle liquid nitrogen elastic pipe (2.6) and finally connected with a plate surface nozzle (4.3); the plate surface nozzle (4.3) is arranged on the upper surface of the lower nozzle base, is positioned below the cast-rolling plate and is aligned to the bottom surface of the cast-rolling plate.
4. The aluminum casting-rolling efficient cooling device of claim 1, characterized in that: the bottom surface of the mixing box (1.4) is also provided with a plurality of ultrasonic transmitters (1.6).
5. The aluminum casting-rolling efficient cooling device of claim 1, characterized in that: a branch is arranged on a pipeline between the emulsion elastic tube (1.8) of the upper nozzle and the flowmeter A and is connected between the nitrogen elastic tube (2.4) of the upper nozzle and the flowmeter D through a regulating valve G; a branch is arranged on a pipeline between the emulsion elastic tube (1.9) of the lower nozzle and the flowmeter B and is connected between the nitrogen elastic tube (2.5) of the lower nozzle and the flowmeter E through a regulating valve H.
6. The aluminum casting and rolling high-efficiency cooling device as claimed in any one of claims 1 to 5, wherein: in the device, the pipeline through which liquid nitrogen or nitrogen flows and the outer wall of the container are both of a double-layer structure with interlayer vacuum pumping.
7. An aluminum casting and rolling high-efficiency cooling process using the aluminum casting and rolling high-efficiency cooling device of claim 1, characterized in that: the method comprises the following steps:
a. purging the pipeline before production;
b. after the alloy grade, the rolling speed and the product specification to be produced are input through the control device (3), the device is in a standby state; liquid-solid ratio is input through a control device (3), automatic proportioning is carried out, liquid nitrogen is added into a mixing box (1.4) from a liquid-nitrogen source (2.1) through a metering pump C, nano graphite is added into the mixing box (1.4) through a nano graphite feeder (1.1), meanwhile, a stirrer (1.3) is automatically started, and when a liquid level meter (1.5) of the mixing box (1.4) sends out a high liquid level alarm, feeding into the mixing box (1.4) is automatically stopped;
c. during production, the control device (3) is in an automatic control mode, and the upper nozzle (4.1), the lower nozzle (4.2) and the plate surface nozzle (4.3) respectively spray the upper casting roller (5.1), the lower casting roller (5.2) and the lower surface of a cast-rolling plate;
d. after production is finished, stopping and purging the device, and finally emptying the device;
wherein, the particle size of the used nano graphite is less than or equal to 1 μm, and the purity of the liquid nitrogen is more than or equal to 99 percent.
8. The aluminum casting-rolling efficient cooling process of claim 7, characterized in that: the specific operation of the step a is as follows:
a1. before production, firstly, the control device (3) is powered on, the manual control mode is switched, a liquid level meter (1.5) of a mixing box (1.4) sends out low liquid level alarm, a metering pump C is started through the control device (3), and the metering pump C is stopped after the low liquid level alarm is eliminated;
a2. opening an adjusting valve A and an adjusting valve B through a control device (3), starting a metering pump A and a metering pump B, purging until liquid nitrogen in a mixing box (1.4) is completely sprayed, then stopping the metering pump A and the metering pump B, and closing the adjusting valve A and the adjusting valve B;
a3. and opening the regulating valve D and the regulating valve E through the control device (3), starting the liquid nitrogen vaporizer feeding metering pump (2.2), stopping the liquid nitrogen vaporizer feeding metering pump (2.2) after confirming that the gas circuit is unblocked, and closing the regulating valve D and the regulating valve E.
9. The aluminum casting-rolling efficient cooling process of claim 7, characterized in that: in the step c, when the liquid level meter (1.5) sends out a low liquid level alarm, liquid nitrogen and nano graphite are automatically supplemented into the mixing box (1.4) from a liquid nitrogen source (2.1) and a nano graphite feeder (1.1) according to a liquid-solid ratio, the rate of supplementing the liquid nitrogen and the nano graphite is greater than the spraying rate of the upper nozzle (4.1), the lower nozzle (4.2) and the plate surface nozzle (4.3), and when the liquid level meter (1.5) sends out a high liquid level alarm, the material supplement is automatically stopped; in addition, during spraying, the upper nozzle base and the lower nozzle base continuously perform scanning type movement, so that the spraying range covers the length range of the upper casting roller (5.1) and the lower casting roller (5.2).
10. The aluminum casting-rolling efficient cooling process of claim 7, characterized in that: in the step D, after production is finished, the control device (3) is switched to a manual control mode, firstly, the metering pump A, the metering pump B and the metering pump F are stopped, the regulating valve F is closed, then the regulating valve G and the regulating valve H are opened, nitrogen purging is carried out for 1 minute, then, the liquid nitrogen vaporizer is stopped to feed the metering pump (2.2), the regulating valve D, the regulating valve E, the regulating valve G and the regulating valve H are closed, a liquid discharge port (1.7) is opened, and residual liquid in the mixing box (1.4) is emptied.
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Application publication date: 20211116 |