CN109174974B - A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line - Google Patents
A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line Download PDFInfo
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- CN109174974B CN109174974B CN201811009320.8A CN201811009320A CN109174974B CN 109174974 B CN109174974 B CN 109174974B CN 201811009320 A CN201811009320 A CN 201811009320A CN 109174974 B CN109174974 B CN 109174974B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line, belongs to the ultrafast cold field of hot continuous rolling.This method comprises: calculating water pump frequency according to ultrafast cold setting pressure and water in water pump raising speed point；When strip steel head does not need special cooling control, the direct raising speed of pumping plant then when strip steel head reaches finish rolling outlet pyrometer, to water pump pressure of supply water dynamic regulation, reaches ultrafast cold pressure setting value to frequency is calculated；When strip steel head needs special cooling control, raising speed twice need to be carried out；Then when strip steel head reaches finish rolling outlet pyrometer, to water pump pressure of supply water dynamic regulation, ultrafast cold pressure setting value is reached；When tail part of band steel leaves ultrafast cold-zone domain, pumping plant reduction of speed to base frequency state.This method solve the problem of high-pressure high-flow stable water supply, especially for strip steel head it is special it is cooling control when, can fast and stable ultrafast cold water pressure, reduce energy consumption, reduce line shock, reduce pipeline vibration, play the role of protecting equipment.
Description
Technical field
The invention belongs to the ultrafast refrigeration technique fields of hot continuous rolling, supply more particularly to a kind of ultrafast cooling system frequency conversion of hot-rolling line
Water method.
Background technique
Compared with conventional laminar flow and encryption laminar flow refrigerating mode, ultra-rapid cooling system have bigger intensity of cooling (for
2~5 times of conventional laminar flow intensity of cooling), using Ultra Fast Cooling, cooperate controlled rolling technology, by cooling
The comprehensively controls of the roller repairings techniques such as intensity, cooling strategy, cooling path, it can be achieved that the organization types of steel, form with
The control of distribution, and then achieve the effect that improve steel tissue and improve comprehensive mechanical property is hot-strip research and development of products with
The important technical of production.And it is the accurate control for realizing ultrafast cold rear belt steel temperature, pumping plant water system need to meet ultrafast
The demand of colod-application water pressure and water is maintained at stable working condition in strip cooling procedure.
In ultra-rapid cooling system use process, cooling water pressure is mostly important one of controlling element, because ultrafast
The stability of cold water pressure, directly affects the stability and strip cooling efficiency of ultrafast cold nozzle flow, and pressure control is unstable
The final cooling effect of strip can be had adverse effect on, it is such as dry especially when strip steel head temperature needs special cooling control
Head control, to realize dry greatest service energy, after strip steel head air-cooled certain distance, when ultrafast cooling system collector moment opens, system
The pressure loss is larger, is unfavorable for front-end temperature control, causes control effect poor, therefore reasonable control method need to be taken to guarantee
The stability of ultrafast colod-application water pressure.
Ultra-rapid cooling system has the characteristics that pressure is high, flow is big in control cooling procedure, while in adjustment process
Spray header pipeline and overflow valve pipeline need frequently to adjust, and it is larger to easily lead to pipeline vibration, influence the stabilization of equipment and system
Property, it is therefore desirable to by reasonable control method to slow down flow pressure variation impact caused by system.
Summary of the invention
For the problem in the prior art, the present invention provides a kind of ultrafast cooling system variable frequency water supply side of hot-rolling line
Method.To guarantee ultrafast cooling system pressure stability, while having the function that reduce energy consumption, reducing line shock.Using the party
Method solves the problems, such as pressure stability contorting, especially needle in high-pressure high-flow water supply process on the basis of using existing equipment
Cooling control technique special to strip steel head temperature, is capable of the ultrafast cold water pressure of guarantee of fast and stable, while reaching energy saving drop
Consumption reduces line shock, reduces pipeline vibration, plays the role of protecting equipment, guarantees the long-term continuous and steady operation of system.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line realizes that the steps included are as follows:
Step 1: in the ultrafast cooling system use process of hot-rolling line, when strip steel head reaches finish rolling F1, as water pump frequency
Rate raising speed point ultrafast cooling system water pressure and will be transmitted to pumping plant with water flow at this time, and pumping station controlling system is according to being demarcated
Water pump frequency-flow curve, water pump frequency is found out using interpolation method；
Step 2: it is special to judge whether strip steel head temperature needs for the cooling control technique sent according to hot-rolling line L2
Cooling control；
Step 3: whether special cooling control is needed according to strip steel head temperature, is divided into following two situation:
The first situation: when strip steel head temperature does not need special cooling control, pumping plant starts raising speed into step 1
The water pump frequency of calculating, after the completion of raising speed, and when strip steel head reaches finish rolling outlet pyrometer, pumping plant receives pressure regulation letter
Number, pumping station controlling system carries out water pump pressure of supply water dynamic regulation according to ultrafast cold pressure setting value, using PID control method.
Second situation: when strip steel head temperature needs special cooling control, pumping plant is on base frequency, frequency upgrading
The 20%~35% of the water pump frequency that calculates in step 1 and base frequency difference after raising speed to setting value, completes a raising speed；
When strip steel head reaches finish rolling F6, water pump is promoted to the water pump frequency calculated in step 1 at the uniform velocity raising frequency, after the completion of raising speed,
When strip steel head reaches ultrafast cold outlet pyrometer, pumping plant receives pressure regulation signal, and pumping station controlling system is according to ultrafast cold pressure
Setting value carries out water pump pressure of supply water dynamic regulation using PID control method.
Step 4: judging whether tail part of band steel leaves ultrafast cold-zone domain, drops if so, sending from ultrafast cooling system to pumping plant
Fast signal, pump station pressure dynamic regulation closed loop disconnect, pumping plant reduction of speed to base frequency state；If it is not, then returning to step four；
When pumping plant reduction of speed to base frequency state, terminate.
The step is a kind of, and water pump frequency-flow curve scaling method is as follows:
Before calibration, the segregated collection pipe relief valve in ultrafast cooling system is all closed, the water supply of pumping plant is all logical at this time
The ultrafast cold collector for crossing ultrafast cooling system carries out pressure adjusting, in 0.3~1.0MPa by adjusting ultrafast cold collector opening degree
Under pressure, every the nozzle flow summation for monitoring ultrafast cold collector under 0.1MPa pressure, ignore the loss of water supply pipe appearance, it will
The actual flow that the nozzle flow summation of ultrafast cold collector supplies water as pumping plant；As pump variable frequency device constantly promotes frequency, note
The relationship of its frequency and flow is recorded, water pump frequency-flow curve is formed.
In the second situation of the step three, when strip steel head temperature needs special cooling control, water pump needs
Secondary raising speed, the water pump frequency that first time raising speed calculates in frequency upgrading step 1 on base frequency and base frequency difference
20%~35%, second of raising speed is promoted to the water pump frequency calculated in step 1, and carries out at the uniform velocity rising film condensation.
The at the uniform velocity rising film condensation are as follows: different according to strip threading speed, the secondary raising frequency speed of water pump is according to following
Method carries out:
If when strip threading speed >=5m/s, when strip steel head reaches finish rolling F6, water pump immediately begins to raising speed；If strip is worn
When tape speed is less than 5m/s, after strip steel head reaches F6, delay 2s water pump starts raising speed, the secondary raising frequency speed of water pump are as follows:
Wherein: the ratio that frequency Zhan always promotes frequency is promoted when α is raising speed of water pump；V is the secondary raising frequency speed of water pump,
Unit is Hz/s, and f is that water pump calculates frequency, and unit Hz, fo are foundation for water pumps frequency, unit Hz, vThreadFor strip threading
Speed, unit m/s.
The ultrafast cooling system variable frequency water supply method of the hot-rolling line, in the ultrafast cooling system use process of hot-rolling line, heat
The method of supplying water of the ultrafast cooling system of tandem rolling line is divided into two stages, the first stage: before strip steel head reaches pressure regulation position, pumping plant
It supplies water according to flow opened loop control；Second stage: after strip steel head reaches pressure regulation position, pumping plant uses PID control method pair
Pressure of supply water Dynamic Closed Loop is adjusted, to meet ultrafast cold stable water demand.
The ultrafast cooling system variable frequency water supply method of a kind of hot-rolling line of the invention, it has the advantage that: the method for the present invention exists
On the basis of existing equipment, solves the problems, such as pressure stability contorting in high-pressure high-flow water supply process, especially for band
Steel head temperature special cooling control technique, is capable of the ultrafast cold water pressure that guarantees of fast and stable, while having reached energy-saving, subtracts
Few line shock reduces pipeline vibration, plays the role of protecting equipment, guarantees the long-term continuous and steady operation of system.
Detailed description of the invention
Fig. 1 is the ultrafast cold variable frequency water supply control method program flow diagram of the method for the present invention hot continuous rolling；
Fig. 2 is the water pump frequency-flow curve demarcated in the embodiment of the present invention 1.
Fig. 3 is ultrafast cold segregated collection pipe pressure trend chart in strip cooling procedure.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
Embodiment 1
The present embodiment is for a thickness of the production of the Q235B steel of 6mm.
A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line, program flow diagram are shown in Fig. 1, specifically include following step
It is rapid:
Step 1:, will as water pump frequency raising speed point when strip steel head, which reaches water pump frequency raising speed point finish rolling F1, stings steel
Ultrafast cooling system sets pressure 0.8MPa and flow 2200m at this time3/ h is transmitted to pumping plant, pumping plant according to ultrafast colod-application water pressure,
Flow and the water pump demarcated frequency-flow curve use interpolation calculation water pump frequency, and the water pump frequency being calculated is
42Hz。
Wherein, water pump frequency-flow curve scaling method is as follows: before calibration, ultrafast cold segregated collection pipe relief valve is complete
Portion closes, and the water supply of pumping plant is all by the ultrafast cold collector of ultrafast cooling system at this time, by adjusting the opening of ultrafast cold collector
Degree carries out pressure adjusting, respectively under 0.3~1.0MPa pressure, every the nozzle for monitoring ultrafast cold collector under 0.1MPa pressure
Flow summation ignores the loss of water supply pipe appearance, the reality that the nozzle flow summation of ultrafast cold collector is supplied water as pumping plant
Flow.As pump variable frequency device constantly promotes frequency, its frequency is recorded, flow forms water pump frequency-flow curve, the song of formation
Line is shown in Fig. 2.
Step 2: the cooling technique that pumping plant is sent according to rolling line, no dry head, the requirement of hot head technique, strip steel head temperature is not
Need special cooling control.
Step 3: not needing special cooling according to strip steel head temperature and control, pumping plant raising speed since base frequency 20Hz,
Raising speed is to 42Hz, and after the completion of raising speed, when strip steel head reaches finish rolling outlet pyrometer, pumping plant receives pressure regulation signal, uses
PID control method carries out the adjusting of rolling line Pressure behaviour.
Step 4: when tail part of band steel leaves ultrafast cold-zone domain, signal to reduce the speed, pumping plant pressure are sent from ultrafast cooling system to pumping plant
Power dynamic regulation closed loop disconnects, pumping plant reduction of speed to base frequency 20Hz state, terminates.
Embodiment 2
The present embodiment is by taking the Q345B for producing 11mm as an example.
A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line, program flow diagram are shown in Fig. 1, specifically include following step
It is rapid:
Step 1:, will at this time as water pump frequency raising speed point when strip steel head, which reaches water pump frequency raising speed point F1, stings steel
Ultrafast cooling system pressure 0.8MPa and flow 4500m3/ h is transmitted to pumping plant, pumping plant according to ultrafast colod-application water pressure, flow and
Water pump frequency-the flow curve demarcated uses interpolation calculation water pump frequency, and the water pump frequency being calculated is 48Hz.
Wherein, water pump frequency-flow curve scaling method is as follows: before calibration, ultrafast cold segregated collection pipe relief valve is complete
Portion closes, and the water supply of pumping plant is all by the ultrafast cold collector of ultrafast cooling system at this time, by adjusting the opening of ultrafast cold collector
Degree carries out pressure adjusting, respectively under 0.3~1.0MPa pressure, every the nozzle for monitoring ultrafast cold collector under 0.1MPa pressure
Flow summation ignores the loss of water supply pipe appearance, the reality that the nozzle flow summation of ultrafast cold collector is supplied water as pumping plant
Flow.As pump variable frequency device constantly promotes frequency, its frequency is recorded, flow forms water pump frequency-flow curve.
Step 2: the cooling technique that pumping plant is sent according to rolling line judges whether strip steel head temperature needs special cooling control
System.
The cooling technique issued according to rolling line, needs to control the dry head of 2m long, and strip steel head temperature needs cooling control；
Step 3: strip steel head temperature needs special cooling control, and pumping plant promotes 27Hz from base frequency 20Hz and risen
Speed control, after reaching 27Hz, completes a raising speed；
When strip steel head reaches finish rolling F6, when according to strip end rack threading speed being 5m/s, water pump carries out secondary liter
Frequency at the uniform velocity raising speed is to 48Hz；
Wherein, the secondary raising frequency speed v=of water pump (1- α) × (f-f0) × vThread÷ 18=(1-0.25) × (48-20) ×
5 ÷ 18=5.8HZ/s；
The ratio that frequency Zhan always promotes frequency is promoted in above formula, when α is raising speed of water pump, v is the secondary raising frequency of water pump
Speed, f are that water pump calculates frequency, and fo is foundation for water pumps frequency, vThreadFor strip threading speed.
When strip steel head reaches ultrafast cold outlet pyrometer after the completion of raising speed, pumping plant receives pressure regulation signal, is controlled using PID
Method processed carries out pressure of supply water dynamic regulation, to meet ultrafast cold stable water demand.
Step 4: when tail part of band steel leaves ultrafast cold-zone domain, signal to reduce the speed, pumping plant pressure are sent from ultrafast cooling system to pumping plant
Power dynamic regulation closed loop disconnects, pumping plant reduction of speed to base frequency state, terminates.
Embodiment 3
The present embodiment is by taking the X70 pipe line steel for producing 22mm as an example.
A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line, program flow diagram are shown in Fig. 1, specifically include following step
It is rapid:
Step 1:, will at this time as water pump frequency raising speed point when strip steel head, which reaches water pump frequency raising speed point F1, stings steel
Ultrafast cooling system pressure 0.8MPa and flow 5500m3/ h is transmitted to pumping plant, pumping plant according to ultrafast colod-application water pressure, flow with
And the water pump frequency-flow curve demarcated uses interpolation calculation water pump frequency, the water pump frequency being calculated is 50Hz.
Wherein, water pump frequency-flow curve scaling method is as follows: before calibration, ultrafast cold segregated collection pipe relief valve is complete
Portion closes, and the water supply of pumping plant at this time is all by the ultrafast cold collector of ultrafast cooling system, by adjusting ultrafast cold collector opening degree,
Pressure adjusting is carried out manually, respectively under 0.3~1.0MPa pressure, every the nozzle for monitoring ultrafast cold collector under 0.1MPa pressure
Flow summation ignores the loss of water supply pipe appearance, the reality that the nozzle flow summation of ultrafast cold collector is supplied water as pumping plant
Flow.As pump variable frequency device constantly promotes frequency, its frequency is recorded, flow forms water pump frequency-flow curve.
Step 2: the cooling technique that pumping plant is sent according to rolling line judges whether strip steel head temperature needs special cooling control
System.
It is required according to cooling technique, needs to control 2 meters long of dry head, strip steel head temperature needs special cooling control；
Step 3: strip steel head temperature needs special cooling control, and raising speed of pumping plant is promote frequency 32%, pumping plant
33Hz is promoted by base frequency 25Hz and completes a raising speed after reaching 33Hz；
When strip steel head reaches finish rolling F6, when the X70 pipe line steel strip threading speed of 22mm is 2.2m/s, water pump is carried out
Secondary raising frequency at the uniform velocity raising speed is to 50Hz；
Wherein, the secondary raising frequency speed of water pump:
V=(1- α) × (f-f0)×vThread÷(2.6×vThread+ 5)=(1-0.32) × (50-25) × 2.2 ÷ (2.6
× 2.2+5)=3.5HZ/s；
The ratio that frequency Zhan always promotes frequency is promoted in above formula, when α is raising speed of water pump, v is the secondary raising frequency of water pump
Speed, f are that water pump calculates frequency, and fo is foundation for water pumps frequency, vThreadFor strip threading speed.
When strip steel head reaches ultrafast cold outlet pyrometer after the completion of raising speed, pumping plant receives pressure regulation signal, is controlled using PID
Method processed carries out pressure of supply water dynamic regulation, to meet ultrafast cold stable water demand.
Step 4: when tail part of band steel leaves ultrafast cold-zone domain, signal to reduce the speed, pumping plant pressure are sent from ultrafast cooling system to pumping plant
Power dynamic regulation closed loop disconnects, pumping plant reduction of speed to base frequency state, terminates.
Using the control method, the X70 pipe line steel of 22mm, in cooling procedure, ultrafast cold segregated collection pipe pressure change
Tendency chart is shown in Fig. 3.
Claims (5)
1. a kind of ultrafast cooling system variable frequency water supply method of hot-rolling line, which is characterized in that comprise the following steps that
Step 1: in the ultrafast cooling system use process of hot-rolling line, when strip steel head reaches finish rolling F1, as water pump frequency liter
It is fast, ultrafast cooling system water pressure and it will be transmitted to pumping plant with water flow at this time, pumping station controlling system is according to the water demarcated
Pump frequency-flow curve finds out water pump frequency using interpolation method；
Step 2: the cooling control technique sent according to hot-rolling line L2 judges whether strip steel head temperature needs special cooling
Control；
Step 3: whether special cooling control is needed according to strip steel head temperature, is divided into following two situation:
The first situation: when strip steel head temperature does not need special cooling control, pumping plant starts raising speed and calculates into step 1
Water pump frequency, after the completion of raising speed, and when strip steel head reaches finish rolling outlet pyrometer, pumping plant receives pressure regulation signal, pump
Station control system carries out water pump pressure of supply water dynamic regulation according to ultrafast cold pressure setting value, using PID control method；
Second situation: when strip steel head temperature needs special cooling control, pumping plant is on base frequency, frequency upgrading step
The 20%~35% of the water pump frequency that calculates in one and base frequency difference after raising speed to setting value, completes a raising speed；Work as band
When steel head reaches finish rolling F6, water pump is promoted to the water pump frequency calculated in step 1 at the uniform velocity raising frequency, after the completion of raising speed, strip
When head reaches ultrafast cold outlet pyrometer, pumping plant receives pressure regulation signal, and pumping station controlling system is set according to ultrafast cold pressure
Value carries out water pump pressure of supply water dynamic regulation using PID control method；
Step 4: judging whether tail part of band steel leaves ultrafast cold-zone domain, if so, sending reduction of speed letter from ultrafast cooling system to pumping plant
Number, pump station pressure dynamic regulation closed loop disconnects, pumping plant reduction of speed to base frequency state；If it is not, then returning to step four；Work as pump
Reduction of speed stand to base frequency state, terminates.
2. the ultrafast cooling system variable frequency water supply method of hot-rolling line as described in claim 1, which is characterized in that the step one
In, water pump frequency-flow curve scaling method is as follows:
Before calibration, the segregated collection pipe relief valve in ultrafast cooling system is all closed, the water supply of pumping plant all passes through super at this time
The ultrafast cold collector of fast cooling system carries out pressure adjusting, in 0.3~1.0MPa pressure by adjusting ultrafast cold collector opening degree
Under, every the nozzle flow summation for monitoring ultrafast cold collector under 0.1MPa pressure, ignore the loss of water supply pipe appearance, it will be ultrafast
The actual flow that the nozzle flow summation of cold collector supplies water as pumping plant；As pump variable frequency device constantly promotes frequency, it is recorded
The variation relation of frequency and flow forms water pump frequency-flow curve.
3. the ultrafast cooling system variable frequency water supply method of hot-rolling line as described in claim 1, which is characterized in that the step three
Second situation in, when strip steel head temperature needs special cooling control, water pump needs second of raising speed, first time raising speed
The 20%~35% of the water pump frequency and base frequency difference that are calculated in frequency upgrading step 1 on base frequency, second liter
Speed is promoted to the water pump frequency calculated in step 1, and carries out at the uniform velocity rising film condensation.
4. the ultrafast cooling system variable frequency water supply method of hot-rolling line as claimed in claim 3, which is characterized in that the at the uniform velocity liter
Speed control are as follows: different according to strip threading speed, the secondary raising frequency speed of water pump carries out in accordance with the following methods:
If when strip threading speed >=5m/s, when strip steel head reaches finish rolling F6, water pump immediately begins to raising speed；If strip threading speed
When degree is less than 5m/s, after strip steel head reaches F6, delay 2s water pump starts raising speed, the secondary raising frequency speed of water pump are as follows:
Wherein: the ratio that frequency Zhan always promotes frequency is promoted when α is raising speed of water pump；V is the secondary raising frequency speed of water pump, unit
It is that water pump calculates frequency, unit Hz, f for Hz/s, foFor foundation for water pumps frequency, unit Hz, vThreadFor strip threading speed
Degree, unit m/s.
5. the ultrafast cooling system variable frequency water supply method of hot-rolling line as described in claim 1, which is characterized in that the hot continuous rolling
The ultrafast cooling system variable frequency water supply method of line, in the ultrafast cooling system use process of hot-rolling line, the confession of the ultrafast cooling system of hot-rolling line
Water method is divided into two stages, the first stage: before strip steel head reaches pressure regulation position, pumping plant is supplied according to flow opened loop control
Water；Second stage: after strip steel head reaches pressure regulation position, pumping plant is using PID control method to pressure of supply water Dynamic Closed Loop tune
Section, to meet ultrafast cold stable water demand.
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| JPH0569029A (en) * | 1991-09-10 | 1993-03-23 | Nippon Steel Corp | Method and device for cooling high temperature metal |
| KR20120132841A (en) * | 2011-05-30 | 2012-12-10 | 현대제철 주식회사 | Accelerated cooling apparatus for removing residual stress and accelerated cooling method |
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| CN103861879A (en) * | 2014-03-28 | 2014-06-18 | 东北大学 | Online cooling device and control method for moderate-thickness plate |
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Application publication date: 20190111 Assignee: GUANGXI SHENGLONG METALLURGICAL CO.,LTD. Assignor: Northeastern University Contract record no.: X2021210000049 Denomination of invention: A frequency conversion water supply method for ultrafast cooling system of hot continuous rolling line Granted publication date: 20190820 License type: Common License Record date: 20211117 |