CN101332474A - Control method of rolling mill capable of preventing slipping - Google Patents
Control method of rolling mill capable of preventing slipping Download PDFInfo
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- CN101332474A CN101332474A CNA2007100425374A CN200710042537A CN101332474A CN 101332474 A CN101332474 A CN 101332474A CN A2007100425374 A CNA2007100425374 A CN A2007100425374A CN 200710042537 A CN200710042537 A CN 200710042537A CN 101332474 A CN101332474 A CN 101332474A
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Abstract
The invention discloses a control method for preventing a rolling mill from slipping, which comprises the following steps: A, the speeds of a strip steel and a roller are measured by a velometer, a forward slip value of a frame is calculated, and step B is followed; B, the forward slip value is judged, when the forward slip value is less than a certain determined value, step C is carried out, otherwise, the control is stopped; C, the forward pull of the frame is increased, measured and judged, when the forward pull is more than a certain determined value, step D is carried out, otherwise, step A is carried out; D, a backward pull of the frame is decreased, and step A is carried out. The method can solve the problem that the rolling mill slips in the course of high-speed rolling, can improve work efficiency of the frame, and can avoid pull fluctuation of the frame even or strip breakage caused by the frequent adjustment when the frame is accelerated or decelerated.
Description
Technical field
The present invention relates to the cold rolling technology of field of metallurgy, especially for the anti-slip control method of sour milling train group.
Background technology
Acid milling train group is the preceding road unit in the cold-rolling process flow process, in the high-speed rolling process, occurs sometimes skidding and wipes problem such as sliding injury, and influence of rolled stable, its product quality defect also can influence or be delivered to road, back unit, causes the product surface quality defective.Existing anti-slip control method as shown in Figure 1, wherein, 1 is the band steel, 2 be working roll, 3 be the roll speed detector, 4 be preceding sliding rate computing module, 5 is the strip speed detector, 6 be under control device, 7 is that the master presses oil cylinder, 8 is tenslator.This technology is to monitor in real time by the advancing slip value of 4 pairs of frames of preceding sliding rate computing module, and further is converted into advancing slip rate of change Δ f/ Δ t.When advancing slip rate of change surpasses α, judge that this frame skids control output quantity y.It skids by two kinds of regulating measures improvement:
1. by depressing the gap values between rollers that control device 6 changes the i frame;
2. by the tension force between tenslator 8 change i and i-1 frame.
The purpose of two kinds of regulating measures all is in order to reduce the tension force between i and i-1 frame.Owing to reduce tension force setting value certain limit is arranged, when the tension force between i and i-1 frame is reduced to limit value and can not reduce the time, still can not improves as if the skidding of i frame again, this control method is just powerless so.In addition, also have the following disadvantages:
1. reduce the tension force between i and i-1 frame, can make the corresponding rising of loading of i-1 frame and front frame thereof, thereby the raising that each frame drafts distributes before the restriction i frame limits the efficient of other frame.
2. step mode (the empty frame part of Fig. 1) is adopted in advancing slip judgement, be that advancing slip rate of change Δ f/ Δ t exports controlled quentity controlled variable y during greater than α immediately, this mode influences when the milling train stable state is rolling not quite, but when the milling train acceleration and deceleration, because advancing slip rate of change easily fluctuates, and causes this control frequent movement, makes tension force frequent fluctuation between frame, it is stable to influence mill milling, may cause broken belt when serious.
3. the less situation of skidding of rate of change can't be judged and control for advancing slip value is big.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of rolling mill capable of preventing slipping, it can solve the deficiencies in the prior art, eliminate or when alleviating high-speed rolling milling train problem of slip appears, improve the frame operating efficiency, can avoid simultaneously producing the frequent problem that causes tension fluctuation between frame even broken belt of regulating because of the frame acceleration and deceleration.
The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of control method of rolling mill capable of preventing slipping comprises the steps:
A. utilize tachymeter to obtain strip speed and roll speed, the advancing slip value of computer rack, execution in step B;
B. judge advancing slip value, when advancing slip value during less than certain determined value, execution in step C; Otherwise control finishes;
C. improve the forward pull of frame, measure and also to judge the frame forward pull, when frame forward pull during greater than certain determined value, execution in step D; Otherwise, execution in step A;
D. reduce the backward pull of frame, execution in step A.
Preferably, step C measures earlier and judges the frame forward pull, when the frame forward pull greater than certain determined value, execution in step D, otherwise, improve the frame forward pull, again execution in step A.
Preferably, the tachymeter of described measurement strip speed and roll speed is respectively laser velocimeter and motor speed detector.
Preferably, an inertial element is adopted in the calculating of described advancing slip value.
Preferably, the adjustment of described tension force is controlled by the roll gap of frame.
Preferably, the formula of described roll gap regulated quantity is:
ΔS
(i)＝KPG×KBC×(T
SET(i)+T
slip(i)-T
FB(i))+∑KIG×KBC×(T
SET(i)+T
slip(i)-T
FB(i))×ΔT
2
Wherein:
T
SET (i)Be i frame outlet tension force setting value, unit is a ton;
T
Slip (i)Be i frame forward pull regulated quantity, unit is a ton;
T
FB (i)Be i frame forward pull, unit is a ton;
KPG is proportional gain;
KIG is a storage gain;
KBC is a tension force deviation compensation coefficient;
Δ T
2Be timed task T
2Scan period.
The present invention is owing to adopted above technical scheme, make it compared with prior art, have the following advantages and good effect: improve the degree of accuracy of skidding and judging, and dynamic response is fast, can effectively avoid the generation of milling train skidding, can not cause simultaneously the tension fluctuation between frame, guarantee rolling stable.
Description of drawings
Fig. 1 is the control schematic diagram of prior art;
Fig. 2 is a control schematic diagram of the present utility model;
Fig. 3 is a control flow chart of the present utility model;
Fig. 4 is a graph of a relation between the 3 frame forward pull deviation compensation KBC coefficients of the utility model embodiment 1 and tension force deviation;
Fig. 5 is a graph of a relation between the 2 frame backward pull deviation compensation KBC coefficients of the utility model embodiment 2 and tension force deviation.
The specific embodiment
As Fig. 2, shown in 3, A. utilizes laser velocimeter and motor speed detector, obtains i-1 frame outlet strip speed V respectively
I-1(unit is mpm), i frame outlet strip speed V
i(unit is mpm) and i breast roll linear velocity V
R (i), by formula f
i=V
i/ V
R (i)-1, use one time inertial element, the advancing slip value f of computer rack
i(unit is mpm), execution in step B.
B. ought scan the advancing slip value f of i frame
i＜-1.0% o'clock (this is an empirical value, because of milling train is different with rolling operating mode all can be different) judges that then this frame skids execution in step C.Otherwise control finishes.
C. use tensiometer, when scanning i frame outlet tension force actual value T
FB (i)(unit is a ton)＞X * i frame outlet tension force setting value T
SET (i)(unit is a ton), wherein the X value is definite very crucial.General according to all previous milling train broken belt tension data, from the broken belt data, count the relation of setting between tension force and the broken belt tension force, be that principle is selected maximum X value, execution in step E finally not influence the milling train broken belt; Otherwise, execution in step D.
D. by increasing the forward pull regulated quantity T of i frame
Slip (i)(unit is a ton) realizes i frame outlet tension force actual value T
FB (i)The increase of (unit is a ton).Each recruitment ξ, i.e. T of setting
Slip (i)=T
Slip (i)+ ξ.In order to make the tension force smooth change, be provided with recruitment ξ rate of change ladder control function, recruitment ξ is carried out amplitude limit control, i.e. the forward pull regulated quantity T in each program scanning cycle
Slip (i)Be stepped change, make i frame forward pull actual value T
FB (i)Steadily increase, elimination is skidded, and avoids broken belt.Execution in step A.
E. be the sharing of load allowance of avoiding i frame generation broken belt and influencing each frame of front, can be by reducing the backward pull regulated quantity T of i frame
Slip (i-1)(unit is a ton) realizes i frame inlet tension force actual value T
FB (i-1)The minimizing of (unit is a ton).Each setting reduction is ξ, i.e. T
Slip (i-1)=T
Slip (i-1)-ξ.By ξ rate of change ladder control function, realize that tension force steadily reduces, elimination is skidded, and avoids broken belt.Execution in step A.
The adjustment of tension force is to control by the roll gap of frame, in the present invention, adopts the proportional plus integral control mode, and this mode has fast and the high characteristics of precision.Set its control and be input as (T
SET (i)+ T
Slip (i)) (or T
SET (i-1)-T
Slip (i-1)) and tension feedback actual value T
FB (i)(or T
FB (i-1)), control is output as the roll gap regulated quantity Δ S (i) (or Δ S (i-1)) of i frame, and the output relation formula is:
ΔS(i)＝KPG×KBC×(T
SET(i)+T
slip(i)-T
FB(i))+∑KIG×KBC×(T
SET(i)+T
slip(i)-T
FB(i))×ΔT2
In the formula: KPG is proportional gain, and KIG is a storage gain, and Δ T2 is the scan period of timed task T2, and unit is 20ms; KBC is a tension force deviation compensation coefficient.
In order to improve the response of tension force control, used the KBC parameter especially.This parameter is relevant with the deviation size of tension force, and promptly the tension force deviation is big, and then the KBC value is also big, and roll gap Δ S (i) regulated quantity is also big, thereby improves the responsiveness of tension force control.This parameter can be confirmed and solidifies use by test.
Embodiment 1:
Production status: milling train production specification 3.5mm/0.8mm * 1413mm, as 3 frame forward pulls setting value T
SET (3)Be 38KN, backward pull setting value T
SET (2)Be 42KN, mill speed V
3During for 895mpm, milling train 3 frames are skidded, at this moment advancing slip value f
3Be-1.23%, because 3 frames are skidded, the band steel is shaken in the rolling-mill housing, and the thickness fluctuation of frame is bigger, influences the milling train steady production.
Adjustment situation: drop into rolling mill capable of preventing slipping control function and debugging.Adjust the forward pull regulated quantity T of 3 frames earlier
Slip (3), key is to determine the rate of change of each recruitment ξ of setting and ξ here.Determine that the ξ process is: (0.8KN → 0.7KN → 0.6KN → 0.5KN), determine that ξ rate of change ladder amount process is: (0.8KN/20ms → 0.4KN/20ms → 0.2KN/20ms → 0.1KN/20ms).In order to improve tension force control response, the KBC in the automatic tension control module is adjusted, its adjusted result is referring to Fig. 4.Current tension adjustment amount T
Slip (3)(promptly 3 frame forward pulls set value T to be increased to 2.5KN
SET (3)Become 40.5KN (T
FB (3)＞X * T
SET (3))), advancing slip value f
3Become 0.15%, the elimination of skidding.This embodiment 1 has only used raising forward pull mode just to realize the anti-slip adjusting.
When embodiment 2:(3 frame is skidded,, eliminate and skid) by adjusting 3 frame forward pull and backward pulls
Production status: milling train production specification 3.0mm/0.5mm * 1200mm, as 3 frame forward pulls setting value T
SET (3)Be 29KN, backward pull setting value T
SET (2)Be 34KN, mill speed V
3During for 901mpm, milling train 3 frames are skidded, at this moment advancing slip value f
3Be-1.3%, because 3 frames are skidded, the band steel is shaken in the rolling-mill housing, and the thickness fluctuation of frame is bigger, and milling train can't steady production.
Adjustment situation: drop into rolling mill capable of preventing slipping control function and debugging.The rate of change 0.1KN/20ms that elder generation sets recruitment ξ 0.5KN and ξ with 3 frames at every turn regulates, until forward pull setting value T
SET (3)(doubly set value) advancing slip value f during greater than 31.9KN greater than X
3Still be-1.0%, milling train is still skidding, can not steady production.Adopt subsequently and reduce 3 frame backward pull T
SET (2)Method debug, determine that the ξ process is: (1.0KN → 0.8KN → 0.7KN → 0.6KN), determine that ξ rate of change ladder amount process is: (1.0KN/20ms → 0.8KN/20ms → 0.6KN/20ms → 0.4KN/20ms), KBC in the automatic tension control module is also adjusted, and its adjusted result is referring to Fig. 5.As additional backward pull regulated quantity T
Slip (2)(promptly 3 frame backward pulls set value T to reduce to 3.0KN
SET (2)Become 31.0KN (T
FB (2)＞0.9T
SET (2))), advancing slip value f
3Become 0.07%, the elimination of skidding.
Claims (6)
1. the control method of a rolling mill capable of preventing slipping, it comprises the steps:
A. utilize tachymeter to obtain strip speed and roll speed, the advancing slip value of computer rack, execution in step B;
B. judge advancing slip value, when advancing slip value during less than certain determined value, execution in step C; Otherwise control finishes;
C. improve the forward pull of frame, measure and also to judge the frame forward pull, when frame forward pull during greater than certain determined value, execution in step D; Otherwise, execution in step A;
D. reduce the backward pull of frame, execution in step A.
2. the control method of rolling mill capable of preventing slipping as claimed in claim 1 is characterized in that: step C is for measuring and judge the frame forward pull, when the frame forward pull greater than certain determined value, execution in step D, otherwise, improve the frame forward pull, again execution in step A.
3. the control method of rolling mill capable of preventing slipping as claimed in claim 1 or 2, it is characterized in that: the tachymeter of described measurement strip speed and roll speed is respectively laser velocimeter and motor speed detector.
4. the control method of rolling mill capable of preventing slipping as claimed in claim 3 is characterized in that: inertial element of calculating employing of described advancing slip value.
5. the control method of rolling mill capable of preventing slipping as claimed in claim 4, it is characterized in that: the adjustment of described tension force is controlled by the roll gap of frame.
6. the control method of rolling mill capable of preventing slipping as claimed in claim 5, it is characterized in that: the formula of described roll gap regulated quantity is:
ΔS
(i)＝KPG×KBC×(T
SET(i)+T
slip(i)-T
FB(i))+∑KIG×KBC×(T
SET(i)+T
slip(i)-T
FB(i))×ΔT
2
Wherein:
T
SET (i)Be i frame outlet tension force setting value, unit is a ton;
T
Slip (i)Be i frame forward pull regulated quantity, unit is a ton;
T
FB (i)Be i frame forward pull, unit is a ton;
KPG is proportional gain;
KIG is a storage gain;
KBC is a tension force deviation compensation coefficient;
Δ T
2Be timed task T
2Scan period.
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|---|---|---|---|
| CN2007100425374A CN101332474B (en) | 2007-06-25 | 2007-06-25 | Control method of rolling mill capable of preventing slipping |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100425374A CN101332474B (en) | 2007-06-25 | 2007-06-25 | Control method of rolling mill capable of preventing slipping |
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| CN101332474B CN101332474B (en) | 2010-09-08 |
Family
ID=40195502
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