CN101733290B - Anti-tail out automatic control system of hot continuous rolling thin strip steel - Google Patents
Anti-tail out automatic control system of hot continuous rolling thin strip steel Download PDFInfo
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- CN101733290B CN101733290B CN 200810228949 CN200810228949A CN101733290B CN 101733290 B CN101733290 B CN 101733290B CN 200810228949 CN200810228949 CN 200810228949 CN 200810228949 A CN200810228949 A CN 200810228949A CN 101733290 B CN101733290 B CN 101733290B
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Abstract
The invention discloses an anti-tail out automatic control system of hot continuous rolling thin strip steel, mainly comprising a signal detection device, a programmable logic controller (PLC) and a control actuating mechanism; the roll forces on both sides detected by a roll force sensor are compared in the PLC to obtain a deviation signal, after being processed by a signal filtering processing unit, the deviation signal subtracts the roll force deviation value maintained by a current rack when a previous rack throws steel, and then an initiating threshold value and action direction are judged through a judging unit for regulating the initiating threshold value and a judging unit for regulating the action direction, when the deviation value is up to the threshold value, the action direction can be judged out according to the positive and negative of the difference value, in addition, under the condition of satisfying linkage, a roll seam horizontal regulation signal is output through an UP or DOWN terminal within the range of horizontal regulation amplitude limiting value of the roll seam between the linkage and a protection unit to control the actuating mechanism to control the horizontalness of the roll seam. In the invention, the adaptation of a rolling mill system at the tail end of strip steel is improved, thereby reducing operating trouble of strip steel, improving the stability of strip steel rolling process, and solving the problem that artificial manual regulation is not in time.
Description
Technical field
The invention belongs to metallurgical electric automatization control technology field, especially a kind of anti-tail out automatic control system of hot continuous rolling thin strip steel.
Background technology
The height of strip hot rolling process stability directly has influence on the quality of belt steel product, the crescent moon sinus of the hot-strip end band steel operation troubles that falls into, cause with the sideslip of steel, with collision of steel end and guide plate arrangement etc. in process of production, the interruption that causes production process is to produce the low major reason of belt steel rolling process stability, its final phenomenon be exactly with the steel afterbody fly waft, be commonly called as " whipping ".The band steel of hot strip mill whipping is a kind of production abnormality, general multiple being born in thin specification, hard material, wide rolled piece and the silicon steel production, the whipping phenomenon appears in producing, especially continuously occur, cause band steel afterbody crimping and afterbody broken, give the harm that causes on producing very large, folding broken afterbody is easy to scratch roll surface, cause the roll marks defective of product, want roll change midway rolling like this; Broken relic often causes again rolled piece surface scratch or rolls useless heap steel as contacting with rolled piece; Broken relic is brought in the coiling machine, and the lighter will affect the normal operation of coiling machine, and severe one can be damaged coiling machine.
Before and after analyzing whipping band steel and rolling this piece steel, normally find with PDA (real-time data acquisition system) data of steel, it is bigger than normal at afterbody rolling force deviation compared with normal band steel that whipping band steel occurs, begin just to have sideslip trend (as shown in Figure 1) from finish rolling F1 during particularly finish rolling F7, and discovery band steel threading.When whipping occured, each frame will obviously increase at the rolling force deviation with the steel afterbody, and operating personnel run into the level that this situation can be adjusted corresponding frame mostly usually, went to press a side of roll-force increase, prevented from being with steel tail deviation whipping.Certainly because mill speed is very fast, and frame quantity is more in addition, operating personnel can't look after institute's organic frame.So just can't avoid by operating personnel's idea the generation of whipping.
Summary of the invention
The object of the present invention is to provide a kind of anti-tail out automatic control system of hot continuous rolling thin strip steel, situation about changing according to the rolling force deviation of this frame is adjusted the roll gap level value of this frame automatically, control band steel tail deviation, reduce the operation troubles with steel, improve the stability of belt steel rolling process, solve the untimely problem of adjusting manually.
The object of the present invention is achieved like this, and a kind of anti-tail out automatic control system of hot continuous rolling thin strip steel is characterized in that mainly comprising signal supervisory instrument, programmable logic controller PLC, control executing agency; The bilateral roll-force that is detected by rolling force sensor compares in PLC and obtains deviation signal; after the signal filtering processing unit processes; the rolling force deviation value that this frame keeps when throwing steel with forebay is poor; start the judgement of threshold value and the judgement of direction of action by the judging unit of adjusting startup threshold value and the judging unit of direction of action again; if difference has reached threshold value; then direction of action also is judged out according to the positive and negative of difference; and in the situation that satisfy chain; by UP or DOWN terminal output roll gap Level tune signal, control executing agency regulates the roll gap level in the roll gap horizontal adjustment amplitude limit value scope of chain and protected location.
The present invention determines chain and roll gap horizontal adjustment amplitude limit value protected location according to the size of rolling force deviation rate of change; roll gap horizontal adjustment amplitude limit value comprises two parts; the one, the amplitude limit value that afterbody drops into when adjusting is 0.1～0.5mm, the 2nd, and the middle amplitude limit value that drops into when adjusting is 0.05～0.1mm.
Afterbody drops into function (TEBH---TAIL END BEELINE HOLD afterbody straight line keeps), its Basic Design is to come the automatically powerful roll gap level value of adjusting this frame according to the situation of the rolling force deviation variation of this frame, characteristics are that adjustment amount is relatively large (when TEBH afterbody input function is selected, realize enough large adjustment amount by the amplitude limit value that changes adjusting range), purpose mainly is the generation of control whipping.
The middle function that drops into, its Basic Design are to come the automatically slight roll gap level value of adjusting this frame according to the situation of the rolling force deviation variation of this frame; Also carry out the control of roll gap level according to the center line detecting data of finish rolling outlet in addition, characteristics are adjustment amount less (realizing enough little adjustment amount by the amplitude limit value that changes adjusting range), purpose mainly is the stability of controlled rolling center line, improves the turriform problem of coiling machine.
The present invention is according to the variation tendency with steel afterbody rolling force deviation in milling train, go to press a side of roll-force increase, automatically adjust the roll gap level value of corresponding frame, reduce greatly the incidence of whipping, even in the situation that whipping does not occur, used this system also can greatly improve running deviation value with the steel afterbody, improved rolling machine system in the adaptive capacity with the steel afterbody, reduce the operation troubles with steel, improve the stability of belt steel rolling process, solve the untimely problem of adjusting manually.
Description of drawings
Fig. 1 is the variation tendency of each machine of finishing mill rolling force deviation when whipping occurs F6/F7;
Fig. 2 is hardware structure chart of the present invention;
Fig. 3 is system program theory diagram of the present invention.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Such as Fig. 2, shown in Figure 3, the present invention can adopt the external hanging type design that is independent of outside the former mill control system, only need from former rolling machine system, to take a small amount of detection signal a, the PLC control platform b of application of advanced, but more reliable, cost is moderate indirectly for mode, and installation and debugging easily, conveniently, reliable operation, function are easy to expansion.
As can be seen from Figure 2 PLC control platform b has only got the bilateral roll-force signal Fn RF of the every rolling mill of former rolling machine system, the centerline deviation signal FMDEL CL DIF of bilateral roll gap signal Fn GAP and finishing mill outlet, also has a small amount of position signal, keep function to drop into comprising the afterbody straight line and select TEBHON, the afterbody straight line keeps dropping into selection TEBH MID ON in the middle of the function, steel signal FMM-IN is stung in finish rolling, the N-1 frame sting steel signal Fn-1M-IN, the N frame sting steel signal Fn M-IN, the manual intrusion signal MAN of operator ON, through the control of PLC control platform b and by PLC control platform b the roll gap horizontal adjustment instruction of milling train is delivered among original rolling miller master control system c, realized the control to the mill roll-gap level.
Fig. 3 is system program theory diagram of the present invention, comprise timing control unit 1, regulate to start judging unit 2, the direction of action of threshold value judging unit 3, judging unit 4 that the convergence of rolling force deviation trend stops to regulate, throw command unit 5, the chain and protected location 6 of system, signal filtering processing unit 7 that milling train level value behind the steel recovers the threading value.
The function of timing control unit 1 is that the TEBH function can be dropped into and disconnection automatically according to certain logical order, when the input function is selected in the middle of the TEBH of Fn frame afterbody input and the TEBH (TEBH ON and TEBH MID ON position signal all are " 1 " among Fig. 3), the sequential of the timing control unit 1 of working out according to program, (FM M-IN position signal was " 1 " among Fig. 3 in the end of finishing mill threading before this, the M-IN position signal of expression finish rolling institute organic frame all is " 1 ") the middle function that drops into of time-delay rear (TD of signal back, FM M-IN position among Fig. 3) input TEBH, drop into function in the middle of the TEBH and begin to regulate, automatically adjust the roll gap level value of this frame according to the situation of rolling force deviation variation; But the adjustment amount less mainly is the stability of controlled rolling center line.When corresponding frame TEBH afterbody drops into function when dropping into (Fn-1M-IN position signal is " 1 " through getting after non-for " 0 " among Fig. 3), the automatically switch TEBH function of this frame of program, making corresponding frame TEBH afterbody drop into function drops into, it also is the level value of automatically adjusting milling train according to the situation that rolling force deviation changes, adjustment amount is relatively large, mainly is the generation that prevents whipping.Until this frame is when throwing steel (Fn M-IN position signal is " 0 " among Fig. 3), function is cut away automatically by program.According to the sequential of timing control unit 1, (when MAN ON position signal is for " 1 " among Fig. 3) TEBH function also can be cut away automatically by program when operating personnel manually intervened roll gap.
The function of regulating the judging unit 2 that starts threshold value is to regulate the judgement that starts threshold value, the roll-force that is detected by rolling force sensor compares in PLC and obtains deviation signal (Fn RFDIF (WS-DS) signal among Fig. 3), after 7 processing of signal filtering processing unit, the rolling force deviation value that keeps when throwing steel with forebay is poor, if difference has reached threshold value, in the situation that the interlocking condition all satisfies, export roll gap Level tune signal by the UP among Fig. 3 or DOWN terminal.UP among Fig. 3 and DOWN terminal are interlocking in adjustment process, prevent that two-terminal from being " 1 " simultaneously in the process of regulating.
The function of the judging unit 3 of direction of action is the direction of judging that the TEBH function should be regulated roll gap, is judged out by comparator according to positive and negative (just for DOWN, negatively be UP) of Fn RF DIF (WS-DS) signal among Fig. 3.
The function of the judging unit 4 that rolling force deviation trend convergence stops to regulate is within the fixing unit interval, and the rolling force deviation value (Fn RF DIF (WS-DS) signal among Fig. 3) of utilizing last cycle of oscillation and the difference of the rolling force deviation value (Fn RF DIF (WS-DS) signal among Fig. 3) of a rear cycle of oscillation are judged the trend of rolling force deviation value.(judge by the dead band in the unit 4) when the variation of rolling force deviation is very little or unchanged, program will stop UP or DOWN terminal output roll gap Level tune signal; If the variation of rolling force deviation is violent (judging by the dead band in the unit 4) again, program will be recovered UP or DOWN terminal output roll gap Level tune signal.For the processing that guarantees signal is always the value that current period subtracted a upper cycle, added especially polarity treatment loop (being the switching of signal sign) in the back of oscillation circuit in addition.
Recover the command unit 5 of threading value, its function is to drop into or TEBH two kinds of moment that function is put into of middle input when the TEBH afterbody, program is sent instruction, require original roll gap control program to remember the roll gap level value of this moment, two kinds of functions of input were put into value constantly (owing in the TEBH adjustment process, the roll gap level value is changed) in the middle of responsible roll gap level value with this frame returned to TEBH afterbody input or TEBH after this frame is thrown steel.Certainly this function is finished by original system program, and unit 5 just provides needs and keeps and the sequential of recovering (command unit 5 of recovery threading value keeps, recovers when being output as " 0 " retention value when being output as " 1 ").The functional purpose of this element is to throw the threading requirement that the deviate of roll gap behind the steel can satisfy next piece steel in order to make.
The function of the chain and protected location 6 of system is that protection is chain; the requirement that is the concrete equipment of basis customizes; such as roll gap horizontal adjustment amplitude limit value (the adjustment amount LIMIT in the chain and protected location 6 of Fig. 3 system), system chain (comprising the health signal of limiting value, the pressure head sensor of rolling force deviation, the health signal of magnetic scale sensor that roll gap detects usefulness etc.); if any one condition does not wherein satisfy, system all will stop the roll gap Level tune.
Signal filtering processing unit 7 functions are the external disturbance that leach some signals such as roll-force and roll gap, the control UP that the assurance system can be correct or DOWN terminal output roll gap Level tune signal.
Claims (3)
1. an anti-tail out automatic control system of hot continuous rolling thin strip steel is characterized in that mainly comprising signal supervisory instrument, programmable logic controller PLC, control executing agency;
The bilateral roll-force that is detected by rolling force sensor compares in PLC and obtains the first rolling force deviation, after described the first rolling force deviation is processed through signal filtering processing unit (7), the second rolling force deviation that this frame keeps when throwing steel with forebay is made the poor difference that obtains, start the judgement of threshold value and the judgement of direction of action by the judging unit (2) of adjusting startup threshold value and the judging unit (3) of direction of action again, when described difference has reached threshold value, then direction of action also is judged out according to the positive and negative of described difference, and in the situation that satisfy chain, in the roll gap horizontal adjustment amplitude limit value scope of chain and protected location (6), by UP or DOWN terminal output roll gap Level tune signal, control executing agency regulates the roll gap level;
Determine chain and roll gap horizontal adjustment amplitude limit value protected location (6) according to the size of the rate of change of rolling force deviation, roll gap horizontal adjustment amplitude limit value comprises two parts, the one, and afterbody drops into the amplitude limit value when adjusting, and it is 0.1～0.5mm; The 2nd, the middle amplitude limit value that drops into when adjusting, it is 0.05～0.1mm;
Afterbody drops into and to refer to: according to the situation of change of the rolling force deviation of this frame, go the side of pressing roll-force to increase, come the automatically powerful roll gap level value of adjusting this frame, purpose is the generation of control whipping;
The middle input refers to: according to the situation of change of the rolling force deviation of this frame, go the side of pressing roll-force to increase, come the automatically slight roll gap level value of adjusting this frame; Purpose is the stability of controlled rolling center line, improves the turriform problem of coiling machine.
2. a kind of anti-tail out automatic control system of hot continuous rolling thin strip steel according to claim 2 is characterized in that afterbody drops into and the middle order that drops into was controlled by timing control unit (1) with the moment.
3. a kind of anti-tail out automatic control system of hot continuous rolling thin strip steel according to claim 1 and 2 is characterized in that the roll gap adjustment of middle input is also carried out the control of roll gap level according to the center line detecting data of finish rolling outlet.
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| CN102489544B (en) * | 2011-12-19 | 2014-08-13 | 中冶南方（武汉）自动化有限公司 | Control method for high-speed drifting of cold rolling treatment line decoiler |
| CN103042041A (en) * | 2013-01-14 | 2013-04-17 | 首钢京唐钢铁联合有限责任公司 | Controlling method for reducing hot rolled strip steel drifting |
| CN104209343B (en) * | 2014-09-05 | 2016-06-29 | 山西太钢不锈钢股份有限公司 | Hot-rolling finishing mill frame compensates the control method of prompt drop |
| CN104259222B (en) * | 2014-10-22 | 2016-04-13 | 山东钢铁股份有限公司 | A kind of reversing cold mill stable rolling method of operating |
| CN105598181B (en) * | 2016-01-15 | 2017-12-26 | 山西太钢不锈钢股份有限公司 | Hot continuous rolling thin specification fine-rolling strip steel afterbody reduces roller force control method automatically |
| CN107824618B (en) * | 2016-09-15 | 2019-03-26 | 上海梅山钢铁股份有限公司 | Tail part of band steel automatic deviation correction control method |
| CN106734242B (en) * | 2016-11-30 | 2018-12-04 | 鞍钢股份有限公司 | A kind of horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode |
| CN111530940B (en) * | 2020-05-09 | 2021-05-25 | 河钢股份有限公司承德分公司 | Steel rolling drift automatic adjusting method based on bounce theory |
| CN111922094B (en) * | 2020-07-09 | 2022-06-14 | 首钢京唐钢铁联合有限责任公司 | Control method for automatically setting horizontal value of head of strip steel and finishing mill system |
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| DE19718529A1 (en) * | 1997-05-02 | 1998-11-12 | Schloemann Siemag Ag | Method for operating a rolling mill for hot and cold rolling flat products |
| CN100566866C (en) * | 2007-01-18 | 2009-12-09 | 宝山钢铁股份有限公司 | A kind of control method of roughing intermediate blank camber |
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