CN106734242A - A kind of horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode - Google Patents
A kind of horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode Download PDFInfo
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- CN106734242A CN106734242A CN201611082090.9A CN201611082090A CN106734242A CN 106734242 A CN106734242 A CN 106734242A CN 201611082090 A CN201611082090 A CN 201611082090A CN 106734242 A CN106734242 A CN 106734242A
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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
- B21B37/58—Roll-force control; Roll-gap control
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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
- B21B37/72—Rear end control; Front end control
Abstract
The present invention relates to a kind of horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode, the postmedian material shape of roughing supplied materials is adjusted using finish rolling forebay, mitigate the adjustment burden of afer bay rolling；Intermediate stand amendment strip tail shape, it is ensured that the steady rolling of last frame；Milling train controls steel strip tail deviation according to the roll gap level value of this frame of the rolling force deviation change adjust automatically of this frame, reduces the operation troubles of strip, improves the stability of belt steel rolling process.Advantage is：The dynamic control of the mill roll-gap level amount in strip hot rolling process is realized, the generation that rolling stability inhibits whipping accident is effectively raised.
Description
Technical field
The invention belongs to finishing mill control field, more particularly to a kind of finishing mill roll gap water of double acting state dead zone function mode
Flat automatic adjustment system.
Background technology
The roll gap level amount of hot finisher is always artificially to move towards state according to the transverse direction of strip in rolling to remove tune manually
It is whole, to ensure that the steady of strip shuts out.But this method not only results in labor intensity of operating staff greatly, spirit height during operation
Anxiety, and multi-frame cannot simultaneously regard Gu, and inefficiency causes steel-fastening, whipping Frequent Accidents.
Unsure state change, can all correspond to the change of rolling force deviation during according to belt steel rolling.Strip laterally runs
Partially more, rolling force deviation change is bigger.Most typically whipping accident, is found by long-term data analysis, whenever getting rid of
Several seconds before the generation of tail accident, the rolling force deviation of milling train can all be varied widely, and rolling force deviation is to which side
Increase, also imply that strip is partial to which side.If observed data finds that at this moment operating personnel have found strip running deviation, immediately
Carry out manual roll gap horizon bar pre-, be also the increased side of pressure roll-force.But it is after all to be operated by people, due to rolling speed
Degree is very fast, and frame is more, and operating personnel cannot regard and turn round and look to all of frame.If a kind of function is inclined in tail part of band steel roll-force
When difference becomes big, correctly timely automated dynamic level amount can be adjusted, then will greatly reduce the incidence of whipping, even if
Whipping can not substantially improve the running deviation value of tail part of band steel yet, while also substantially increasing adaptation energy of the rolling machine system in tail part of band steel
Power.
Initially the control to carry out roll gap level amount for the rolling force deviation variation tendency according to milling train will not be highly difficult,
But by just being found after further investigation, rolling force deviation variation tendency is a dynamic process trend data for extremely difficult judgement.This
Individual data trend is disturbed by extremely many factors in itself, and such as electric noise jamming, rolling mill vibration interference, roll eccentricities are done
Disturb, milling train acceleration and deceleration are disturbed, strip watermark change interference etc. is to use to believe generally for these direct solutions of interference
Number filtering mode is controlled, but by experiment many times, above-mentioned its interfering frequency of various disturbing factors and difference of vibration
Different too big, being directly controlled using filtering mode can significantly postpone real rolling force deviation trend, lose automatic roller
Seam level control rapidity requirement, using so treatment after signal come carry out Trend judgement with control, be it is skimble-skamble,
Opposite effect even can be played, huge harm is carried out to rolled bands.Due to cannot well exclude these interference, really roll
Power change of error trend processed also just cannot accurately be judged, let alone control.
The content of the invention
To overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of finishing mill of double acting state dead zone function mode
The horizontal automatic adjustment system of roll gap, state change during rolling actual according to strip, multi-frame is while real-time adjustment mill roll-gap
Level amount, effectively substitutes manually operated, improves operating efficiency, mitigates the labour intensity of operating personnel, reduces production accident,
Final improve production efficiency and product quality.
To achieve the above object, the present invention is achieved through the following technical solutions：
A kind of horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode, is adjusted using finish rolling forebay
The postmedian material shape of roughing supplied materials, mitigates the adjustment burden of afer bay rolling；Intermediate stand amendment strip tail shape, it is ensured that end
The steady rolling of frame；
Milling train controls tail part of band steel according to the roll gap level value of this frame of the rolling force deviation change adjust automatically of this frame
Sideslip, reduces the operation troubles of strip, improves the stability of belt steel rolling process.
Judge including screen operation loop, SECO loop, control interlock circuit, High frequency filter loop, adjustment polarity
Loop, zero Trend judgement loop, dynamic dead zone width measure loop, the upper and lower extreme position counter circuit of dynamic dead zone, output are cumulative
Loop, top layer Mathematical Modeling；
Screen operation loop：One operation screen is provided, function selection is carried out for operating personnel；F1~F7 frames it is automatic
Leveling TEBH ON afterbodys put into function, automatic leveling TEBH MID ON middle consumption functions；
SECO loop：Logical order is automatically engaged and broken as described below TEBH afterbodys straight line is kept function
Open, when the TEBH ON afterbodys input function and TEBH MID ON middle consumptions function of Fn frames are chosen, before this in finish rolling
Machine threading puts into TEBH MID ON middle consumption functions after terminating time delay, and TEBH MID ON middle consumption functions start regulation,
According to the roll gap level value of this frame of the situation adjust automatically of rolling force deviation change, it is ensured that the material of stable rolling amendment strip
Shape；When corresponding frame TEBH ON afterbodys input function puts into, the TEBH afterbodys straight line of this frame that automatically switches keeps function,
Corresponding frame TEBH ON afterbody inputs function is put into, is also that situation about changing according to rolling force deviation carrys out adjust automatically milling train
Level value, adjustment amount is relatively large, prevents the generation of whipping；TEBH functions are cut automatically by program when this frame throws steel
Fall；When operating personnel are intervened roll gap manually, TEBH afterbodys straight line keeps function to be cut away automatically by program, and output keeps,
Manual intervention terminates rear roll gap automatic flat-adjustable function and puts into again again；
Control interlock circuit：
1. rolling force deviation is more than 300 tons or pressure head failure, and TEBH functions do not put into, and prevent pressure head failure from causing the system
Misoperation；
2. the bilateral hydraulic cylinder oil column deviation of AGC automatic thickness control systems is more than 2.8mm, and TEBH afterbodys straight line keeps work(
Can not put into, prevent AGC automatic thickness control systems from occurring locking protection because bilateral hydraulic cylinder oil column deviation is excessive；
3. finish rolling outlet strip shim values transfinite, and TEBH afterbodys straight line keeps function not put into, and prevents quality accident；
High frequency filter loop：By produced by the electric noise jamming included in rolling force deviation signal and rolling mill vibration
Signal fluctuation is filtered, it is ensured that steady operation；
Adjustment polarity judges loop：Judge that whether TEBH afterbodys straight line keeps the adjustment direction of function correct, prevent TEBH
Afterbody straight line keeps function misoperation；
Zero Trend judgement loop：Judge the flex point of rolling force deviation signal, prevent TEBH afterbodys straight line from keeping function excessively dynamic
Make；Within the fixed unit interval, the rolling force deviation value using previous cycle of oscillation is inclined with the roll-force of latter cycle of oscillation
The difference of difference judges the trend of rolling force deviation value；When varying less or be unchanged of rolling force deviation, will stop outlet roller
Seam level control signal；If the change of rolling force deviation acutely, will recover output roll gap level control signal again；
Dynamic dead zone width measure loop：According to each piece of actual conditions of steel, measure dynamic needed for the system is controlled
State skip distance；Measuring principle is to start measurement after milling train stings steel 5 seconds, and a length of 3 seconds to 7 seconds during measurement, this needs basis to roll
Machine linear velocity is calculated, it is therefore an objective to is allowed in measurement period and is routinely disturbed comprising all of, it is ensured that skip distance value
Accuracy；In the time period specified, the maxima and minima of rolling force deviation signal is measured, two values are just fixed after subtracting each other
The width in dead band of the justice for needed for this block strip TEBH afterbodys straight line keeps function control, it is defeated plus fixed control allowance afterwards
Go out, for the system control；
The upper and lower extreme position counter circuit of dynamic dead zone：
In one piece of operation of rolling of strip, head initial a section is range of instability, does not make any in this section of region
Calculating and control, start to measure the width of dynamic dead zone after range of instability, and to this block strip dynamic dead zone most
First upper limit position and lower position is positioned；When measurement result out after be superimposed one again on the basis of dynamic dead zone width
Individual control allowance, as the used skip distance of the actual control of the system；The actual control stage is put into after measurement period；
Output accumulation loop：When various adjusting conditions all meet, give accumulator one cumulative or regressive instruction, accumulator
The basic adjusted value of roll gap level is exported according to default fixed rate, the amount that will be adjusted each time can be summed together, into
It is a total basis output of this block strip steel rider seam automatic flat-adjustable function, as the set-point that roll gap level is automatically controlled,
The output is cleared after this block belt steel rolling terminates, and actual roll gap level amount is returned to the default value of operating personnel；
Top layer Mathematical Modeling：Thickness, width, roll-force height according to strip, mill speed provide leveling output speed
Ratio, correct accumulator basic output valve, it is ensured that the system precise control.
Double dynamic dead zones be variable dead band in actual control process, skip distance dynamically changeable and dead band bound dynamic
It is variable：
Skip distance dynamically changeable：Because rolling force deviation signal includes numerous interference, and do not allow using big
The means of filtering of amplitude, is exactly skip distance between the upper edge of rolling force deviation signal and lower edge, according to rolling kind and specification
Difference, the width between the upper edge of rolling force deviation signal and lower edge has larger difference, thus dead band width be can
Become；
Dead band bound dynamically changeable：With the change of rolling force deviation main trend, the bound in dead band must be with covariant
Change；When actual rolling force deviation signal touch upper edge and beyond it is a certain amount of when, roll gap level be accomplished by adjustment, this adjustment
At the end of, new deadband upper limit is produced therewith, while lower limit follows rising according to dead band fixed width；When actual rolling force deviation
Signal touch lower edge and beyond it is a certain amount of when, roll gap level is accomplished by adjusting in the opposite direction, after same adjustment terminates
New deadband lower limit is also produced therewith, and the upper limit declines therewith according to dead band fixed width；
Described variable dead band is that input variable value does not change with the change of input variable value.
Compared with prior art, the beneficial effects of the invention are as follows：
Electric noise jamming uses conventional High frequency filter method with rolling mill vibration interference, but uses different filtering
Frequency；It is dynamic using the system independent development most core for roll eccentricities interference, milling train acceleration and deceleration interference, strip watermark change interference
Double dynamic dead zones of the heart judge control technology and zero Trend judgement：
The 1 postmedian material shape that roughing supplied materials is effectively adjusted using finish rolling forebay, mitigates the adjustment burden of afer bay rolling.
2 utilize intermediate stand amendment strip tail shape, it is ensured that the steady rolling of last frame.
3 is big for characteristic difference between each heating furnace, and rolling line equipment precision declines, and caused material shape is unstable to have amendment to make
With.
4 systems come into operation after finishing mill roll when wedge shape be greatly improved.
The dynamic control of the mill roll-gap level amount in strip hot rolling process is realized, rolling is effectively raised steady
The qualitative generation for inhibiting whipping accident.The anti-whipping control system of hot continuous rolling thin strip steel is in Anshan iron and steel plant share equipment of Hot Strip Mill according to statistics
Since 1780 production lines come into operation, whipping rate reduces 50%, improves production operational availability, product quality, reduces production
Cost, energy resource consumption, it is annual directly to create economic benefit more than 2,000,000 yuan.
Brief description of the drawings
Fig. 1 is the virtual condition of finishing mill rolling force deviation signal.
Fig. 2 is the flow chart of the horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode.
Fig. 3 is that the upper and lower extreme position of dynamic dead zone calculates schematic diagram in the operation of rolling.
Fig. 4 is rolling force deviation signal by the design sketch after multilayer High frequency filter and the reverse overlap-add procedure of low frequency filtering
(for the measurement of accurately skip distance).
Fig. 5 is zero Trend judgement circuit diagram.
In Fig. 1：The actual actual roll gap level amounts of rolling force deviation signal 2- of 1-1780 Hot Line finish rolling F1 milling trains are anti-
Rolling force deviation Trendline (being also the center line of dynamic dead zone) 4- dynamic dead zones required for feedback signal 3-TEBH functions it is upper
The lower position Trendline of extreme position Trendline 5- dynamic dead zones.
Specific embodiment
The present invention is described in detail with reference to Figure of description, it should be noted that implementation of the invention is not limited
In following implementation method.
The horizontal automatic adjustment system of finishing mill roll gap (hereinafter referred to as the system) of double acting state dead zone function mode, for each
The different characteristics of interference is planted, takes different modes to process, electric noise jamming is with rolling mill vibration interference using conventional
High frequency filter method solve, it is dynamic for roll eccentricities interference, milling train acceleration and deceleration interference, strip watermark change interference to use this to be
The most crucial double dynamic dead zones of system independent development judge control technology and zero Trend judgement.
Control principle：
Variable dead band is that input variable value does not change with the change of input variable value, the regional extent of this input variable
It can be understood that being dead band.Variable dead band meaning is that can be effectively shielded from the various interference of dead band inside low amounts level, when defeated
Enter the upper limit or lower limit that variate-value reaches dead band, input variable value just starts to follow change.
Double dynamic dead zones judge that control technology is according to strip state change in finishing mill rolling force deviation signal and milling train
Relation and we require control purpose develop.We have a look the actual shape of finishing mill rolling force deviation signal below
State.
See Fig. 1, the electric miscellaneous of high frequency is included in the actual rolling force deviation signal 4 of 1780 Hot Line finish rolling F1 milling trains
The resonance that ripple, milling train vibrations are produced is disturbed, the rolling force deviation cyclic fluctuation that roll eccentricities bring, and required for we control
Be rolling force deviation Trendline 3 in Fig. 1, that is to say, that the actual rolling force deviation signal 4 of 1780 Hot Line finish rolling F1 milling trains
In the various disturbances that include must mask.
Therefore introduce the concept of double dynamic dead zones, double dynamic dead zones refer to variable dead band in actual control process, dead band
Width dynamically changeable and dead band bound dynamically changeable.
Skip distance dynamically changeable：Because rolling force deviation signal includes numerous interference, and do not allow using big
The means of filtering of amplitude, in order to improve the response speed of the system, using signal outer control technology, then rolling force deviation is believed
Number upper edge and lower edge between be exactly skip distance that we define, according to the difference of rolling kind and specification, rolling force deviation
Width between the upper edge of signal and lower edge has larger difference, and this requires that the width in dead band must be variable.
Dead band bound dynamically changeable：With the change of rolling force deviation main trend, the bound in dead band must be with covariant
Change, the need for this is the system control, be exactly briefly to touch upper edge and beyond a certain amount of when actual rolling force deviation signal
(value is to need to determine again after by actually debugging, and each frame is different, and current its span is general in skip distance
5%~30%) when, roll gap level be accomplished by adjustment, this adjustment at the end of, new deadband upper limit is produced therewith, together
When lower limit follow rising according to dead band fixed width；When actual rolling force deviation signal touch lower edge and beyond it is a certain amount of when
Wait, roll gap level is accomplished by adjusting in the opposite direction, same adjustment terminates rear new deadband lower limit and also produces therewith, and the upper limit is pressed
Decline therewith according to dead band fixed width.This vivid the regarding as of control, " doggie in carton frame pushes carton back and forth for we
Run ".
The basic Controlling principle of the system is that the rich experiences of production operation personnel and gimmick are transplanted into computer controls
In system, roll gap automatic horizontal adjustment is carried out by the idea of production operation personnel, and this control has its particularity, it is normal for
Any one control system has a clear and definite control targe value, and then control system can accurately be controlled around desired value
System.But the system does not have a clear and definite desired value, that is to say, that the system is not meant to rolling force deviation control at certain
Above definite value, in other words have to be by the control of lateral attitude of the strip in milling train in some point, this is in the actual operation of rolling
In be also not allow, it is straight when real stable rolling will ensure belt steel rolling according to the experience of production operation personnel,
Inherence " personality " when taking into account every piece of belt steel rolling again is with curved just curved.Therefore the Controlling principle of the system is actually with regard to two words
" stabilization ", stablizing relatively for rolling force deviation means that strip does not have transverse shifting or not larger inside milling train during rolling
It is unilateral wave produce.When an obvious Long-term change trend occurs in rolling force deviation, illustrate that the state of strip there occurs change, this
It is to be accomplished by roll gap level to go adjustment to be suppressed automatically, until rolling force deviation enters a new Relative steady-state, roll gap water
Flat adjust automatically stops.
The system is that the situation that a kind of milling train can change according to the rolling force deviation of this frame carrys out adjust automatically this frame
Roll gap level value, control steel strip tail deviation, reduce strip operation troubles, improve belt steel rolling process stability, solution
Certainly manually adjust problem not in time.
The system includes：Screen operation loop, SECO loop, control interlock circuit, High frequency filter loop, adjustment pole
Property judges loop, zero Trend judgement loop, dynamic dead zone width measure loop, the upper and lower extreme position counter circuit of dynamic dead zone, defeated
Go out accumulation loop, top layer Mathematical Modeling.
A screen operations loop：One operation screen is provided, function selection is carried out for operating personnel；Concrete function be F1~
The automatic leveling TEBH ON afterbodys input function of F7 frames (protect by TEBH-- TAIL END BEELINE HOLD afterbodys straight line
Hold), automatic leveling TEBH MID ON middle consumption functions.
B SECO loop：Logical order is automatically engaged and broken as described below TEBH afterbodys straight line is kept function
Open, when the TEBH ON afterbodys input function and TEBH MID ON middle consumptions function of Fn frames are chosen, before this in finish rolling
Machine threading puts into TEBH MID ON middle consumption functions after terminating time delay, and TEBH MID ON middle consumption functions start regulation,
According to the roll gap level value of this frame of the situation adjust automatically of rolling force deviation change, it is ensured that the material of stable rolling amendment strip
Shape；When corresponding frame TEBH ON afterbodys input function puts into, the TEBH afterbodys straight line of this frame that automatically switches keeps function,
Corresponding frame TEBH ON afterbody inputs function is put into, is also that situation about changing according to rolling force deviation carrys out adjust automatically milling train
Level value, adjustment amount is relatively large, prevents the generation of whipping；TEBH functions are cut automatically by program when this frame throws steel
Fall；When operating personnel are intervened roll gap manually, TEBH afterbodys straight line keeps function to be cut away automatically by program, and output keeps,
Manual intervention terminates rear roll gap automatic flat-adjustable function and puts into again again.
C controls interlock circuit：
1. rolling force deviation is more than 300 tons or pressure head failure, and TEBH afterbodys straight line keeps function not put into, and prevents pressure head event
Barrier causes the system misoperation；
2. the bilateral hydraulic cylinder oil column deviation of AGC automatic thickness control systems is more than 2.8mm, and TEBH afterbodys straight line keeps work(
Can not put into, prevent AGC automatic thickness control systems from occurring locking protection because bilateral hydraulic cylinder oil column deviation is excessive；It is (super
Limit is reversely adjustable)；
3. finish rolling outlet strip shim values transfinite, and TEBH afterbodys straight line keeps function not put into, and prevents quality accident from (transfiniting
It is reversely adjustable)；
D High frequency filters loop：By produced by the electric noise jamming included in rolling force deviation signal and rolling mill vibration
Signal fluctuation filter, it is ensured that system steady operation.This link uses conventional system to filter order.
E adjustment polarity judges loop：Judge whether the adjustment direction of the system is correct, prevents the system misoperation.At this
Individual link selects to use using two ways, and one kind is that the direct lock mode of rolling force deviation coordinates with fixed dead band, another
It is that double dynamic dead zone medians coordinate with fixed dead band to plant, and specifically chosen that mode will see that side in actual debugging process
The effect of formula is more preferable.
The Trend judgement loops of f zero：Judge the flex point of rolling force deviation signal, prevent TEBH afterbodys straight line from keeping function excessively dynamic
Make；Within the fixed unit interval, using previous cycle of oscillation rolling force deviation value (in Fig. 5 Fn RF DIF (WS-DS) believe
Number) inclined to judge roll-force with the difference of the rolling force deviation value (Fn RF DIF (WS-DS) signal in Fig. 5) of latter cycle of oscillation
The trend of difference；When varying less or be unchanged of rolling force deviation (is judged) by the dead band in Fig. 5, will be stopped defeated
Go out roll gap level control signal；If the change of rolling force deviation acutely, will recover output roll gap level control signal again；Separately
The outer treatment in order to ensure signal is always the value that current period subtracted a upper cycle, is added at polarity behind oscillation circuit
Reason loop (i.e. the switching of signal sign in Fig. 5)；
G dynamic dead zone width measures loop：
According to each piece of actual conditions of steel, the dynamic dead zone width needed for measuring the system control.Its measuring principle
Exactly start measurement after milling train stings steel 5 seconds, a length of 3 seconds to 7 seconds during measurement, this needs to be counted according to milling train linear velocity
Calculate.Purpose is to allow in measurement period routinely be disturbed comprising all of, it is ensured that the accuracy of skip distance value.When specified
Between in section (this frame stings steel plus delayed startup measurement, it is stipulated that stop measurement after duration), measure rolling force deviation signal most
Big value and minimum value, two values subtract each other after be dead band width, along with fixed control allowance, (this amount is need afterwards
Will by actually debugging after determine again, each frame be it is different, current its span it is general skip distance 5%~
30%) export, for the system control.But because strip is in rolling, rolling force deviation data are extremely unstable, especially survey
The prime time section of amount, often big rise and big fall, directly contribute measurement data inaccurate.Measured value is bigger than normal to will result in the system tune
Section sensitivity decrease, if measured value is less than normal, consequence is even more serious, the system regulation can be caused to act chaotic, or even directly adjust
It is whole to limiting value.So the measurement of dynamic dead zone width, it is impossible to directly carry out, it is necessary to rolling force deviation signal first is converted into one
After individual metastable signal, then measure.Therefore entered using the anti-phase multiple-layer stacked technology of low frequency filtering and High frequency filter
Row treatment.Signal after treatment is to remain original signal width, and the big rise and big fall of rolling force deviation signal are eliminated again
Tendency change, make skip distance measure can be carried out in the state of a stabilization.
The upper and lower extreme position counter circuit of h dynamic dead zones：Controlling principle according to described in above control principle, the system
Enter Mobile state adjustment, it is ensured that system precise control.
See Fig. 3, in one piece of operation of rolling of strip, head initial a section is range of instability, in this section of region I
Do not make any calculating and control, start to measure the width of dynamic dead zone after range of instability, and to this block strip
The initial upper limit position of dynamic dead zone and lower position are positioned.When measurement result out after on the basis of dynamic dead zone width
On be superimposed a control allowance again, control used skip distance as system is actual.Reality has been put into after measurement period
Border controls the stage.In figure 3, rolling force deviation value have just enter into the control stage just touched dynamic dead zone lower limit and beyond
Control allowance, this sample system just possesses the condition of regulation, and the horizontal adjust automatically output of roll gap starts upper lift.At the same time,
The system rolling force deviation value is touched the rolling force deviation minimum value occurred again after lower limit for the first time and is defined as dynamic extremely
The lower position of Qu Xin, upper limit position then declines therewith according to fixed width principle.For position reference is carried out in adjustment next time.
After rolling force deviation exceeds dynamic dead zone lower limit, a flex point occurs early or late, this flex point is exactly that the system is wanted
New lower position, when the system is by that after the flex point that zero Trend judgement detects rolling force deviation, will stop roll gap water
Flat adjust automatically output.By that analogy, if rolling force deviation continues to touch the lower limit of dynamic dead zone and beyond allowance is controlled, newly
Regulation will start, new dynamic dead zone position can also be defined.According to strip in Fig. 3 when rear stage is rolled down to, roll
Power deviation processed has touched the upper limit of dynamic dead zone, and beyond control allowance, the at this moment horizontal adjust automatically output of roll gap is opened
Beginning pushes, and flex point stops after occurring, and new upper limit position is produced, and quickly, rolling force deviation value has been touched the new upper limit and surpassed again
Go out and control allowance, the horizontal adjust automatically output of roll gap is started again at and pushed, if flex point is occurred without, the horizontal adjust automatically of roll gap is defeated
The action for pushing would not stop, and be exported until other conditions are limited, and such as the regulated quantity limit, strip throwing steel, operating personnel are manual
Intervention etc..As can be seen from Figure 3 when rolling force deviation is metastable, roll gap level remains in stabilization
State.
I exports accumulation loop：When various adjusting conditions all meet, can be cumulative to one, accumulator or regressive refers to
Order, accumulator exports the basic adjusted value of roll gap level according to default fixed rate, and the amount that will be adjusted each time is accumulated in one
Rise, as the total basis output of this block steel rider seam automatic flat-adjustable function one, this output is clear after this block belt steel rolling terminates
Zero, actual roll gap level amount is returned to the default value of operating personnel.
J top layer Mathematical Modelings：Thickness, width, roll-force height, mill speed according to strip etc. provide a suitable tune
The ratio of flat output speed, corrects the basic output valve of accumulator, it is ensured that system precise control.
See Fig. 4, advantages of the present invention：
Electric noise jamming uses conventional High frequency filter method with rolling mill vibration interference, but uses different filtering
Frequency；It is dynamic using the system independent development most core for roll eccentricities interference, milling train acceleration and deceleration interference, strip watermark change interference
Double dynamic dead zones of the heart judge control technology and zero Trend judgement：
The 1 postmedian material shape that roughing supplied materials is effectively adjusted using finish rolling forebay, mitigates the adjustment burden of afer bay rolling.
2 utilize intermediate stand amendment strip tail shape, it is ensured that the steady rolling of last frame.
3 is big for characteristic difference between each heating furnace, and rolling line equipment precision declines, and caused material shape is unstable to have amendment to make
With.
4 systems come into operation after finishing mill roll when wedge shape be greatly improved.
The dynamic control of the mill roll-gap level amount in strip hot rolling process is realized, rolling is effectively raised steady
The qualitative generation for inhibiting whipping accident.The anti-whipping control system of hot continuous rolling thin strip steel is in Anshan iron and steel plant share equipment of Hot Strip Mill according to statistics
Since 1780 production lines come into operation, whipping rate reduces 50%, improves production operational availability, product quality, reduces production
Cost, energy resource consumption, it is annual directly to create economic benefit more than 2,000,000 yuan.
Claims (3)
1. a kind of horizontal automatic adjustment system of finishing mill roll gap of double acting state dead zone function mode, it is characterised in that utilize finish rolling
Forebay adjusts the postmedian material shape of roughing supplied materials, mitigates the adjustment burden of afer bay rolling；Intermediate stand amendment tail part of band steel
Shape, it is ensured that the steady rolling of last frame；
Milling train controls tail part of band steel to run according to the roll gap level value of this frame of the rolling force deviation change adjust automatically of this frame
Partially, the operation troubles of strip is reduced, the stability of belt steel rolling process is improved.
2. the horizontal automatic adjustment system of finishing mill roll gap of a kind of double acting state dead zone function mode according to claim 1,
It is characterised in that it includes screen operation loop, SECO loop, control interlock circuit, High frequency filter loop, adjustment polarity sentence
Disconnected loop, zero Trend judgement loop, dynamic dead zone width measure loop, the upper and lower extreme position counter circuit of dynamic dead zone, output are tired
Add-back road, top layer Mathematical Modeling；
Screen operation loop：One operation screen is provided, function selection is carried out for operating personnel；The automatic leveling of F1~F7 frames
TEBH ON afterbodys put into function, automatic leveling TEBH MID ON middle consumption functions；
SECO loop：Make TEBH afterbodys straight line keep function as described below logical order automatically engage with disconnection, when
When the TEBH ON afterbodys input function and TEBH MID ON middle consumptions function of Fn frames are chosen, before this in finishing mill threading
TEBH MID ON middle consumption functions are put into after terminating time delay, TEBH MID ON middle consumption functions start regulation, according to rolling
The roll gap level value of the situation adjust automatically of power change of error processed this frame, it is ensured that the material shape of stable rolling amendment strip；Work as phase
When answering frame TEBH ON afterbody inputs function to put into, the TEBH afterbodys straight line of this frame that automatically switches keeps function, makes corresponding machine
Frame TEBH ON afterbodys input function input, is also the level value for carrying out adjust automatically milling train according to the situation of rolling force deviation change,
Adjustment amount is relatively large, prevents the generation of whipping；TEBH functions are cut away automatically by program when this frame throws steel；Operating personnel
When being intervened manually roll gap, TEBH afterbodys straight line keeps function to be cut away automatically by program, and output keeps, and intervenes terminate manually
Roll gap automatic flat-adjustable function puts into again again afterwards；
Control interlock circuit：
1. rolling force deviation is more than 300 tons or pressure head failure, and TEBH functions do not put into, and prevent pressure head failure from causing the system malfunction
Make；
2. the bilateral hydraulic cylinder oil column deviation of AGC automatic thickness control systems is more than 2.8mm, and TEBH afterbodys straight line keeps function not
Input, prevents AGC automatic thickness control systems from occurring locking protection because bilateral hydraulic cylinder oil column deviation is excessive；
3. finish rolling outlet strip shim values transfinite, and TEBH afterbodys straight line keeps function not put into, and prevents quality accident；
High frequency filter loop：By the electric noise jamming included in rolling force deviation signal and the signal produced by rolling mill vibration
Fluctuation is filtered, it is ensured that steady operation；
Adjustment polarity judges loop：Judge that whether TEBH afterbodys straight line keeps the adjustment direction of function correct, prevent TEBH afterbodys
Straight line keeps function misoperation；
Zero Trend judgement loop：Judge the flex point of rolling force deviation signal, prevent TEBH afterbodys straight line from keeping function to cross action；
In the fixed unit interval, using rolling force deviation value and the rolling force deviation value of latter cycle of oscillation of previous cycle of oscillation
The poor trend to judge rolling force deviation value；When varying less or be unchanged of rolling force deviation, will stop output roll gap level
Regulate signal；If the change of rolling force deviation acutely, will recover output roll gap level control signal again；
Dynamic dead zone width measure loop：According to each piece of actual conditions of steel, the dynamic needed for measuring the system control is dead
Sector width；Measuring principle is to start measurement after milling train stings steel 5 seconds, and a length of 3 seconds to 7 seconds during measurement, this is needed according to rolling mill line
Speed is calculated, it is therefore an objective to is allowed in measurement period and is routinely disturbed comprising all of, it is ensured that skip distance value it is accurate
Property；In the time period specified, the maxima and minima of rolling force deviation signal is measured, two values are just defined as after subtracting each other
The width in the dead band needed for this block strip TEBH afterbodys straight line holding function control, exports plus fixed control allowance afterwards,
For the system control；
The upper and lower extreme position counter circuit of dynamic dead zone：
In one piece of operation of rolling of strip, head initial a section is range of instability, does not make any meter in this section of region
Calculate and control, start to measure the width of dynamic dead zone after range of instability, and it is initial to this block strip dynamic dead zone
Upper limit position and lower position are positioned；When measurement result out after be superimposed a control again on the basis of dynamic dead zone width
Allowance processed, as the used skip distance of the actual control of the system；The actual control stage is put into after measurement period；
Output accumulation loop：When various adjusting conditions all meet, give one, accumulator cumulative or regressive instruction, accumulator according to
Default fixed rate exports the basic adjusted value of roll gap level, and the amount that will be adjusted each time can be summed together, as this
One total basis output of block strip steel rider seam automatic flat-adjustable function, used as the set-point that roll gap level is automatically controlled, this is defeated
Go out and be cleared after this block belt steel rolling terminates, actual roll gap level amount is returned to the default value of operating personnel；
Top layer Mathematical Modeling：Thickness, width, roll-force height according to strip, mill speed provide the ratio of leveling output speed
Rate, corrects the basic output valve of accumulator, it is ensured that the system precise control.
3. the horizontal automatic adjustment system of finishing mill roll gap of a kind of double acting state dead zone function mode according to claim 1,
Characterized in that, double dynamic dead zones be variable dead band in actual control process, skip distance dynamically changeable and dead band bound
Dynamically changeable：
Skip distance dynamically changeable：Because rolling force deviation signal includes numerous interference, and do not allow using significantly
Means of filtering, be exactly skip distance between the upper edge of rolling force deviation signal and lower edge, according to rolling kind and specification not
Together, the width between the upper edge of rolling force deviation signal and lower edge has larger difference, therefore the width in dead band is variable；
Dead band bound dynamically changeable：With the change of rolling force deviation main trend, the bound in dead band must follow change；When
Actual rolling force deviation signal touch edge and beyond it is a certain amount of when, roll gap level is accomplished by adjustment, and this adjustment terminates
When, new deadband upper limit is produced therewith, while lower limit follows rising according to dead band fixed width；When actual rolling force deviation signal
Touch lower edge and beyond it is a certain amount of when, roll gap level is accomplished by adjusting in the opposite direction, and same adjustment terminates rear new
Deadband lower limit is also produced therewith, and the upper limit declines therewith according to dead band fixed width；
Described variable dead band is that input variable value does not change with the change of input variable value.
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| CN111767629A (en) * | 2019-03-29 | 2020-10-13 | 宝山钢铁股份有限公司 | Method for evaluating applicability and stably switching rolling force model |
| CN111922090A (en) * | 2020-07-09 | 2020-11-13 | 首钢京唐钢铁联合有限责任公司 | Automatic setting method and system for horizontal value of finishing mill after work roll replacement |
| CN111922094A (en) * | 2020-07-09 | 2020-11-13 | 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 |
| CN114505351A (en) * | 2022-03-16 | 2022-05-17 | 山东钢铁集团日照有限公司 | Method for inhibiting vibration of finishing mill during finish rolling of extreme thin strip steel |
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| CN114505351B (en) * | 2022-03-16 | 2023-10-31 | 山东钢铁集团日照有限公司 | Method for inhibiting vibration of finishing mill during finish rolling of extremely thin strip steel |
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