CN101665946B - Device and method for controlling cold-rolling steel strip pickling turbulence - Google Patents
Device and method for controlling cold-rolling steel strip pickling turbulence Download PDFInfo
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- CN101665946B CN101665946B CN2008100130461A CN200810013046A CN101665946B CN 101665946 B CN101665946 B CN 101665946B CN 2008100130461 A CN2008100130461 A CN 2008100130461A CN 200810013046 A CN200810013046 A CN 200810013046A CN 101665946 B CN101665946 B CN 101665946B
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Abstract
The invention relates to a device and a method for controlling cold-rolling steel strip pickling turbulence. In the device, the inlet end of a pressure gauge is connected with a lateral jet acid valve connected to a main jet acid tube, and the outlet end of the pressure gauge is connected with a lateral jet acid tube; and the lateral jet acid valve and the pressure gauge are connected with an external computer respectively. According to quality of steel strip, the optimal pickling temperature is determined and the relationship between the steel strip speed and the turbulence degree is set; the numeric conversion and the automatic control are completed by three functional blocks PLI10, ADC and PIC of the computer respectively; by automatically adjusting the lateral jet acid valve and the pressure gauge, the dynamic control of the pickling turbulence degree of the steel strip is realized, the overpickling of the steel strip is avoided, and the surface quality of the cold-rolling plate is improved; the equipment damage due to the broken band of a rolling mil is reduced, the yield of the cold-rolling plate and the operating rate of the rolling mill are improved, and several million yuan can be saved annually.
Description
Technical field
The invention belongs to the cold-rolling pickling technical field, be specifically related to a kind of device and control method thereof that is used to control cold-rolling steel strip pickling turbulence.
Background technology
Cold rolled strip turbulent flow pickling technology in the nineteen eighty-three exploitation, and was applied to the German market in 1984 by German MDS company, and turbulent pickling technology is suitable for the cleanup acid treatment of cold-rolling mild steel plate, cold-rolled silicon iron etc.Since its have the pickling time short, heat conduction efficiency is high, wash characteristics such as back band steel residue is few, therefore the cold rolling mill in states such as Germany, Japan is widely used.China introduces turbulent pickling technology since nineteen nineties, and than the shallow slot pickling of using before, its turbulent pickling can greatly improve strip pickling quality and pickling speed.
Yet, find in the actual application at the scene, the strip speed of acid cleaning process section is along with the band steel situation that stores in the kink of pickling tank ingress, the roll speed of milling train, all multifactor impacts such as acid solution characteristic and band steel steel grade and dynamic change, in order to guarantee pickling effect, each producer must set the highest pickling temperature of pickling tank and maximum turbulence level with manual type, and control according to this maximum value, certainly will cause the overpickling defective of part band steel like this, not only directly influence the surface quality and the economic return of band steel, and because the overpickling defective causes the phenomenon of broken belt when being with steel by milling train also to happen occasionally, both cause structure deteriorate, reduced lumber recovery again.Especially when the forward and backward operation of pickling changes, as changing cutting edge, equipment failure shutdown etc., maximum pickling turbulence degree will result in greater loss.
The basic structure of present used turbulent pickler is that the acid solution circulation tank is directly supplied with main jet acid tube road by sour pump, under meter, well heater and main jet acid valve with acid solution, and main jet acid tube road directly sprays acid solution with turbulent form again.In case main jet acid valve is opened, then turbulence level is also definite substantially, even strip speed slows down, the acid solution of main jet acid tube road ejection also can't reduce, i.e. the turbulence level that the acid solution of main jet acid tube road ejection forms is unalterable.Its result will cause the overpickling phenomenon of band steel.
By retrieval, up to now, mainly concentrate on the design and production method of various pickling installations, and hot rolling raw material, acid solution processing parameter be to strip pickling effect Analysis aspect, the data record and the relevant report of the relevant turbulent flow control of Shang Weijian for the research of pickling.
Summary of the invention
Purpose of the present invention aim to provide a kind of can be according to the variation of correlated condition in the pickling tank, automatically regulate turbulent pressure, control mates and closed-loop control each influence factor for the acid amount mutually, thereby avoids pickling turbulence control device and control method thereof with steel overpickling defective.
Studies have shown that the factor of decision pickling quality is pickling temperature, pickling speed, turbulence level, band steel matter and acid solution characteristic, is first three factor and wherein influence is bigger.For the cold rolling mill of long-term production, acid solution characteristic and band steel matter are known, find out and determine that corresponding suitable (or best) pickling temperature is not a difficult matter according to known acid solution characteristic and band steel matter.Therefore, having only pickling speed and turbulence level in the influence factor is to need control.Pickling speed depends on strip speed; Turbulence level is decided by the acid solution flow, and the acid solution flow is that turbulent pressure is determined by acid solution pressure then.
For this reason, the technical solution that the present invention taked is:
A kind of cold-rolling steel strip pickling turbulence control device comprises main jet acid tube road, also contains side and sprays sour valve, pressure warning unit, side acid spraying tube road and computer.The pressure warning unit inlet end sprays sour valve with the side on being connected on main jet acid tube road and is connected, and exit end connects side acid spraying tube road, and side sprays sour valve and pressure warning unit links to each other with outer computer respectively.
The control method of above-mentioned cold-rolling steel strip pickling turbulence control device, its control process is:
At first,, determine the suitable pickling temperature of each material band steel according to pickled steel strip material and acid solution characteristic, and the input computer.
Then, according to the suitable pickling temperature of each material band steel, the relation curve between interior strip speed of pickling tank and the pickling turbulence pressure is determined in experiment, sets up mathematical model, and in the input computer curve functional block PLI10 Controlling System;
Computer curve functional block PLI10 is converted into turbulent setting pressure with the strip speed of input;
Pressure warning unit will detect numerical value and be converted to side acid spraying tube road turbulent flow true pressure through computer mould number conversion functional block ADC;
Turbulent setting pressure and turbulent true pressure are input among the subtractor SUB, subtractor SUB is input to the difference of the two among the proportional integral regulatory function piece PIC, utilize computer proportional integral regulatory function piece PIC controller control side to spray sour valve, the turbulent pressure in offside acid spraying tube road is adjusted automatically, thereby realizes the Dynamic Closed Loop Control of cold-rolling steel strip pickling turbulence.
The method of determining relation curve between strip speed and the pickling turbulence pressure is:
Be with under the constant condition of the suitable pickling temperature of steel, side is sprayed sour valve turbulent pressure be divided into some grades, on each pressure rating, adjust strip speed in the pickling tank respectively, find out the suitable strip speed under certain turbulent pressure, draw corresponding numerical value on coordinate diagram, the connection each point can form the relation curve between strip speed and turbulent pressure.
The best pickling temperature that the present invention determines according to each band steel matter, draw and set the relation of strip speed and turbulence level, carry out numerical value conversion and control automatically by computer PLI10, ADC and three functional blocks of PIC, spray sour valve and pressure warning unit by automatic adjustment side, regulate acid solution pressure and carry out closed loop system control, realize dynamic control the strip pickling turbulence level.Thereby make each factor that influences pickling quality obtain optimum matching, avoided the overpickling phenomenon of band steel, improved the surface quality of cold-reduced sheet; Reduced the structure deteriorate that the milling train broken belt causes, improved the lumber recovery and the operating rate of rolling mill of cold-reduced sheet, year millions of units of saving worth up to.And the present invention is simple in structure, less investment, instant effect, and the system response sensitivity is moved safe and reliablely, has realized full-automatic closed-loop control.
Description of drawings
Fig. 1 is a cold-rolling steel strip pickling turbulence control device structural representation.
Fig. 2 is cold-rolling steel strip pickling turbulence sequence of control figure.
Among the figure: 1 for the pickling circulation tank, and 2 be side acid spraying tube road, and 3 is pressure warning unit, and 4 is main jet acid tube road, and 5 spray sour valve for side, and 6 is the sour valve of main jet, and 7 is subtractor.
Embodiment
As seen from Figure 1, cold-rolling steel strip pickling turbulence control device of the present invention mainly sprays sour valve 5, pressure warning unit 3, side acid spraying tube road 2, main jet acid tube road 4 and external computer by side and forms.Main jet acid tube road 4 is connected with pickling circulation groove 1 with sour pump via main jet acid valve 6, well heater, under meter, supplies with and store acid solution by pickling circulation groove 1.Side is sprayed on the main jet acid tube road 4 that sour valve 5 is connected to main jet acid valve 6 rear portions; Pressure warning unit 3 inlet ends spray sour valve 5 with side and are connected, and exit end connects side acid spraying tube road 2, also is connected to the branch acid spraying tube on the side acid spraying tube road 2, so that spray acid solution to the band steel.Side is sprayed sour valve 5 and pressure warning unit 3 also links to each other with outer computer respectively.PLI10 curve functional block, ADC analog-digital conversion function piece, PIC proportional integral regulatory function piece and SUB subtractor are housed respectively in the outer computer.Side is sprayed sour valve 5 adjusting acid solution flows, and pressure warning unit 3 detects the acid solution pressure, and the PIC control side is sprayed sour valve 5.
The acid solution liquid levels in the pickling circulation grooves 1 are responsible for keeping in main jet acid tube road 4, and spray sour valve 5 by side and provide acid solution to side acid spraying tube road 2.Side sprays sour valve 5 and side acid spraying tube road 2 is responsible for regulating pickling turbulence pressure, has both guaranteed comprehensive immersion of pickled steel strip, regulates the acid solution flow simultaneously, the control turbulent pressure.
In conjunction with Fig. 2 the control mode and the process of above-mentioned cold-rolling steel strip pickling turbulence control device are illustrated.
Adopt the STEP7 or the CFC programming language of SIEMENS company all can realize control process.With CFC is example, and its control process is:
At first,, determine the suitable pickling temperature of each kind band steel according to the band steel matter and the acid solution characteristic of want pickling, and the input computer.In general, Zui Jia strip pickling temperature range is between 80 ℃～85 ℃.
Then, according to the suitable pickling temperature of each material band steel, the optimum matching numerical value between strip speed and the turbulent pressure is determined in experiment, draws the relation curve between interior strip speed of pickling tank and the pickling turbulence pressure.
Set up mathematical model, and in advance with in the best relation curve input computer curve functional block PLI10 Controlling System.
Computer curve functional block PLI10 is converted into turbulent setting pressure with the strip speed of input.
Pressure warning unit 3 will detect numerical value and be converted to side acid spraying tube road 2 turbulent true pressures through computer mould number conversion functional block ADC.
Turbulent setting pressure and turbulent true pressure are input among the subtractor SUB7, and subtractor SUB7 is input to the difference of the two among the proportional integral regulatory function piece PIC.
Utilize computer proportional integral regulatory function piece PIC controller control side to spray sour valve 5, the turbulent pressure in offside acid spraying tube road 2 is adjusted automatically, supplies with the acid solution flow according to the optimum matching numerical value of setting.
Spray the chain reaction of sour valve 5 and ADC and adjustment automatically by pressure warning unit 3, subtractor SUB7, PIC, side, thereby realize the Dynamic Closed Loop Control of cold-rolling steel strip pickling turbulence.
The method of determining relation curve between strip speed and the pickling turbulence pressure is:
Under the certain prerequisite of pickling temperature, side is sprayed sour valve turbulent pressure be divided into some grades.For example 0KPa, 100KPa, 200KPa, 300KPa, 400KPa, 500KPa, 600KPa, 700KPa, eight grades of 800KPa, on each pressure rating, adjust strip speed in the pickling tank then respectively, promptly under the constant condition of pressure, find out and make neither overpickling of band steel, the strip speed when not owing pickling again.That is the best strip speed during corresponding each pressure rating.According to experimental data, on strip speed and turbulent pressure coordinate diagram, mark the respective value point, the connection each point can form the relation curve between strip speed and turbulent pressure.
Claims (3)
1. a cold-rolling steel strip pickling turbulence control device comprises main jet acid tube road, it is characterized in that, contains side and sprays sour valve, pressure warning unit, side acid spraying tube road and computer; The pressure warning unit inlet end sprays sour valve with the side on being connected on main jet acid tube road and is connected, exit end connects side acid spraying tube road, side sprays sour valve and pressure warning unit links to each other with outer computer respectively, and PLI10 curve functional block, ADC analog-digital conversion function piece, PIC proportional integral regulatory function piece and SUB subtractor are housed respectively in the outer computer.
2. according to the control method of the described cold-rolling steel strip pickling turbulence control device of claim 1, it is characterized in that control process is:
At first,, determine the suitable pickling temperature of each kind band steel according to pickled steel strip material and acid solution characteristic, and the input computer;
Then, according to the suitable pickling temperature of each material band steel, the relation curve between interior strip speed of pickling tank and the pickling turbulence pressure is determined in experiment, sets up mathematical model, and in the input computer curve functional block PLI10 Controlling System;
Computer curve functional block PLI10 is converted into turbulent setting pressure with the strip speed of input; Pressure warning unit will detect numerical value and be converted to side acid spraying tube road turbulent flow true pressure through analog-digital conversion function piece ADC;
Turbulent setting pressure and turbulent true pressure are input among the subtractor SUB, subtractor SUB is input to the difference of the two among the proportional integral regulatory function piece PIC, utilize computer proportional integral regulatory function piece PIC controller control side to spray sour valve, the turbulent pressure in offside acid spraying tube road is adjusted automatically, thereby realizes the Dynamic Closed Loop Control of cold-rolling steel strip pickling turbulence.
3. cold-rolling steel strip pickling turbulence control method according to claim 2, it is characterized in that, the method of determining relation curve between strip speed and the pickling turbulence pressure is: be with under the constant condition of the suitable pickling temperature of steel, side is sprayed sour valve turbulent pressure be divided into some grades, on each pressure rating, adjust strip speed in the pickling tank respectively, find out the suitable strip speed under certain turbulent pressure, draw corresponding numerical value on coordinate diagram, the connection each point can form the relation curve between strip speed and turbulent pressure.
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| CN2008100130461A CN101665946B (en) | 2008-09-01 | 2008-09-01 | Device and method for controlling cold-rolling steel strip pickling turbulence |
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| CN2008100130461A CN101665946B (en) | 2008-09-01 | 2008-09-01 | Device and method for controlling cold-rolling steel strip pickling turbulence |
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| CN101665946A CN101665946A (en) | 2010-03-10 |
| CN101665946B true CN101665946B (en) | 2011-07-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677078B (en) * | 2011-03-18 | 2013-10-30 | 宝山钢铁股份有限公司 | Stop spot control method for shallow slot turbulent pickling line |
| CN108624894A (en) * | 2014-09-10 | 2018-10-09 | 中川特殊钢株式会社 | Clean the device of wire rod |
| CN104372357B (en) * | 2014-11-27 | 2016-09-21 | 山东钢铁股份有限公司 | Pickling unit acid tank rupture after production method |
| CN104694942B (en) * | 2015-03-31 | 2018-06-26 | 北京首钢股份有限公司 | A kind of method for producing hot rolling acid-cleaning plate and hot rolling acid-cleaning plate pickling system |
| CN104789973A (en) * | 2015-04-15 | 2015-07-22 | 太原钢铁(集团)有限公司 | Strong turbulence flow acid cleaning method |
| CN105648461B (en) * | 2016-03-07 | 2018-06-22 | 首钢京唐钢铁联合有限责任公司 | The leakage acid processing system and method for acid tank and sour tank in a kind of cold rolling sour rolling mill |
| CN107267996B (en) * | 2017-06-08 | 2019-11-22 | 唐山钢铁集团有限责任公司 | It quickly prevents to owe the method that pickling defect generates |
| CN111719162A (en) * | 2019-03-21 | 2020-09-29 | 宝山钢铁股份有限公司 | Strip steel pickling system |
| CN110965068B (en) * | 2019-11-11 | 2020-12-08 | 北京科技大学 | Acid tank acid outlet structure for uniform acid washing of wide titanium belt |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282485A (en) * | 1991-01-16 | 1994-02-01 | Mitsubishi Jukogyo Kabushiki Kaisha | Jet pickling apparatus |
| US6016819A (en) * | 1997-04-04 | 2000-01-25 | Murray; Gordon | High turbulence multiple stage wire pickling system |
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2008
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282485A (en) * | 1991-01-16 | 1994-02-01 | Mitsubishi Jukogyo Kabushiki Kaisha | Jet pickling apparatus |
| US6016819A (en) * | 1997-04-04 | 2000-01-25 | Murray; Gordon | High turbulence multiple stage wire pickling system |
Non-Patent Citations (1)
| Title |
|---|
| 刘江等.紊流酸洗数学模型分析.《山东冶金》.2005,第27卷(第5期),45-46. * |
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