CN105312358B - The tension control method of cold-strip steel in a kind of acid tandem rolling process - Google Patents
The tension control method of cold-strip steel in a kind of acid tandem rolling process Download PDFInfo
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- CN105312358B CN105312358B CN201410306638.8A CN201410306638A CN105312358B CN 105312358 B CN105312358 B CN 105312358B CN 201410306638 A CN201410306638 A CN 201410306638A CN 105312358 B CN105312358 B CN 105312358B
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Abstract
The present invention relates to a kind of tension control method of cold-strip steel in sour tandem rolling process, the tension control method is controlled withdrawal straightening machine section strip steel tension force using withdrawal straightening machine frequency converter and PLC, when the tension force setting value of withdrawal straightening machine section strip steel is more than 0, using positive tension force, when withdrawal straightening machine section strip steel tension force setting value is less than 0, using negative tension force, realize the "positive" or "negative" switching control to withdrawal straightening machine section strip steel tension force, the tension force of strip in descaling bath is controlled to realize by controlling the tension force of withdrawal straightening machine section strip steel, realize greatly improving for descaling bath tension force, the loss that belt steel surface caused by solving the problems, such as existing control mode scratches and frequently replaces support stone and produce.
Description
Technical field
The present invention relates to the tension force of cold-strip steel technical field, particularly cold-strip steel, is specifically a kind of sour tandem rolling
The tension control method of cold-strip steel in process.
Background technology
It is pickling to have an important procedure in cold rolling process, by the process by the iron scale wash clean on strip top layer, with
Beneficial to the deep processing of follow-up unit.In pickling unit or sour tandem rolling process unit, strip is gone to toward first passing through into descaling bath
Cross withdrawal straightening machine.By the effect of withdrawal straightening machine, dephosphorization is not only carried out to belt steel surface, but also band steel plate type is improved, with
Strip enters descaling bath progress pickling afterwards, to improve pickling effect.During strip pickling, because descaling bath is up to rice up to a hundred,
Strip is readily formed sagging arc in groove body, causes belt steel surface to occur to scratch phenomenon.With rubbing between strip and groove body
The accumulation of wiping, has an effect on the service life of groove body bottom support stone, causes maintenance cost to rise.If slightly replacing not in time, when serious
Groove body can be caused worn out, and then produce leakage, leakage not only produces a large amount of acid mists, influences human body health, but also corrosion is set
It is standby, make to be repaired by forced-stopping machine.Fig. 1 be in pickling section acid tank strip it is sagging with support stone mutually wipes schematic diagram, equipped with withdrawal straightening machine body 1,
First tension roll assembly, withdrawal straightening machine survey instrument 2, the second tension roll assembly, descaling bath body 4, front and rear pinch roller 4a, 4b, support stone 4c, the
Three tension roll assemblies and acid tank survey an instrument 6.According to the difference of descaling bath strip tension, the sagging radian of strip is also different, keeps one
A principle is advisable with the radian that strip is formed and support stone not grazing.First tension roll assembly includes the first jockey pulley 1a, the second tension force
Roller 1b and the 3rd jockey pulley 1c, the second tension roll assembly include the 4th jockey pulley 3a, the 5th jockey pulley 3b and the 6th jockey pulley 3c, the
Three tension roll assemblies include the 7th jockey pulley 5a and the 8th jockey pulley 5b.
In order to reduce the sagging loss with caused by support stone even groove body generation grazing of strip in descaling bath, it is necessary to preferably
Control the sagging radian of strip in descaling bath.Existing 2 kinds traditional ameliorative ways.One is limiting the specification of strip and using manual
Method of adjustment, as 200710038532.4 patent applications of entitled " a kind of strip tension adjusting method and device " are taken off
Show, because strip steel specification is partially thin, under equal tension, strip is tighter.Because using manual mode, the method meeting
Unit production capacity and operating efficiency are influenced, tends not to meet production requirement.The second is not limiting the specification of production strip, adopt
With descaling bath tension force setting method is improved, modification descaling bath tension force sets T4, reduce strip sag as far as possible, make strip sagging most
Low spot A is stepped up, and increases gap between A points and support stone 4C, to reduce the loss between strip and support stone caused by grazing.But because of acid
Withdrawal straightening machine special process requirement in section is washed, pickling section tension force, which improves, will influence withdrawal straightening machine tension force T1If pickling section tension force T4Improve
It is excessive, withdrawal straightening machine tension force T1It will be changed into " bearing " value, and the detection of strip " negative " tension force can not be carried out in the prior art, so that can not
Implement control, therefore this method is only capable of pickling section tension force improving 5%~10% or so, tend not to solve thick wide specification strip steel with
The problem of holding in the palm stone grazing, can not meet production requirement.
It can be seen from the above that both the above improves strip radian method in descaling bath, although the sagging minimum point A of strip can be improved
Height, but be all limited raising, it is necessary to limit the specification of strip and the tension force of strip is improved in part, tend not to full
The requirement that the foot unit think gauge or specification are expanded.
The content of the invention
The object of the present invention is to provide a kind of tension control method of cold-strip steel in sour tandem rolling process, the tension force side
Method can be detected based on tension leveler torque and be converted into strip tension, carry out the "positive" or "negative" switching control of strip tension, be realized
Descaling bath tension force greatly improves, scratched to belt steel surface caused by solving existing control mode and frequently replace support stone and
The loss problem of generation.
To achieve the above object, the solution of the present invention is：The tension control method of cold-strip steel in a kind of acid tandem rolling process,
Sour tandem rolling process unit includes withdrawal straightening machine, withdrawal straightening machine surveys Zhang Yi, descaling bath and descaling bath and surveys Zhang Yi, and the withdrawal straightening machine is arranged on
The previous procedure of descaling bath, the control method reach strip tension in descaling bath by adjusting the strip tension of withdrawal straightening machine section
Sets requirement, is controlled the strip tension of withdrawal straightening machine section using withdrawal straightening machine frequency converter and PLC, and the control method step is such as
Under：
(1) according to the relation of the sectional area of strip and tension force, strip tension and withdrawal straightening machine section strip steel in descaling bath are established
Power static table, and the static table is stored in PLC memories, strip tension value is i.e. in the descaling bath stored in the static table
For the setting value of strip tension in descaling bath；
(2) PLC obtains the sectional area of strip according to the specification for treating pickled steel strip, and quiet described in by search step (1)
State table, obtains strip tension value in withdrawal straightening machine section strip steel tension value and descaling bath, so that it is determined that can make strip tension in descaling bath
Reach the withdrawal straightening machine section strip steel tension force setting value of its setting value；
(3) if the setting value of withdrawal straightening machine section strip steel tension force is more than the tension force that 0, PLC receives withdrawal straightening machine survey instrument measurement
Analog value, and digitized processing is the positive tension force actual value of strip, by the positive tension force actual value of strip and withdrawal straightening machine section strip steel tension force
Setting value is compared, and output motor for withdrawal ＆ straightening machine speed adjustment amount is into withdrawal straightening machine frequency converter, and withdrawal straightening machine frequency converter is to withdrawal straightening machine
The speed of motor is adjusted, and realizes the positive tension force to withdrawal straightening machine section strip steel, and enter step (6)；If withdrawal straightening machine section
Strip tension setting value is less than 0, then enters step (4)；
(4) PLC receives the motor for withdrawal ＆ straightening machine actual speed that withdrawal straightening machine frequency converter is sent, and withdrawal straightening machine section strip steel tension force is set
Definite value is converted into the motor negative moment amplitude limit value of withdrawal straightening machine, is obtained according to the rotating speed of the motor negative moment amplitude limit value and motor
The given value of current value of withdrawal straightening machine frequency converter, and withdrawal straightening machine frequency converter is sent to, amplitude limit control is carried out to motor for withdrawal ＆ straightening machine torque, it is real
Now to the negative tension force of withdrawal straightening machine section strip steel；
(5) PLC receives the motor for withdrawal ＆ straightening machine moment values that withdrawal straightening machine frequency converter is sent, and according to the motor for withdrawal ＆ straightening machine power
Square is worth to the negative tension force actual value of withdrawal straightening machine section strip steel；
(6) deviation of withdrawal straightening machine section strip steel tension force actual value and setting value is compared, if the deviation is less than setting
Tension variation value, then complete the control of strip tension in a descaling bath；Otherwise, the tension force progress to withdrawal straightening machine section strip steel is continued
Adjustment, until withdrawal straightening machine section strip steel tension force actual value and setting value deviation are less than the tension variation value set, is realized to descaling bath
The control of interior strip tension.
Method according to the present invention, in the step (1), strip tension and withdrawal straightening machine section strip steel in the descaling bath
Tension force static table is：
Method according to the present invention, in the step (2), the definite withdrawal straightening machine section strip steel tension force setting value
Method is：
T4=Bg (2)
T1=Bg (1)-Bg (2)-(T2+T3)×0.95
Wherein, Bg (1) is the withdrawal straightening machine section strip steel tension value that search static table obtains, and Bg (2) search static tables obtain
Strip tension value in descaling bath, T1For withdrawal straightening machine section strip steel tension force setting value, T2For the band between the 3rd jockey pulley and the 4th jockey pulley
Steel tension force setting value, T3For the tension force setting value between the 4th jockey pulley and the 5th jockey pulley, T4Set for strip tension in acid tank
Value.
Method according to the present invention, in the step (4), withdrawal straightening machine section strip steel tension force setting value is converted into drawing
The method for rectifying electromechanics machine negative moment amplitude limit value is：
Wherein, M is negative moment amplitude limit calculated value, and D is roller diameter, and Gr is gear-box gear ratio, T1For withdrawal straightening machine section strip steel
Power setting value
Method according to the present invention, in the step (4), the given value of current value of withdrawal straightening machine frequency converter is：
Ispc_min=-Iq
Wherein, Ispc_minIt is the amplitude limit setting value of withdrawal straightening machine inverter current controller, IqIt is the torque electricity of motor for withdrawal ＆ straightening machine
Flow valuve, IWithdrawal straightening machineFor withdrawal straightening machine rated current, PWithdrawal straightening machineFor withdrawal straightening machine rated power, n is the actual speed of motor for withdrawal ＆ straightening machine.
Method according to the present invention, in the step (5), the method for obtaining negative tension force actual value is：
I1=I3-I2
Wherein：T1actFor negative tension force actual value, C1For moment of accelerating conversion coefficient, JWithdrawal straightening machineFor withdrawal straightening machine rotary inertia, D is
Roller diameter, Gr are gear-box gear ratio, PWithdrawal straightening machineFor withdrawal straightening machine rated power, NWithdrawal straightening machineFor the rated speed of motor for withdrawal ＆ straightening machine,To draw
The machine of rectifying acceleration magnitude, I1Torque current needed for tension force, I are established for withdrawal straightening machine section strip steel2For withdrawal straightening machine moment of accelerating electric current, I3For
Motor for withdrawal ＆ straightening machine surveys torque current.
Method according to the present invention, in the step (6), withdrawal straightening machine section strip steel tension force actual value and setting value
Deviation is：
Wherein, Δ T is the deviation of withdrawal straightening machine section strip steel tension force actual value and setting value；T1For withdrawal straightening machine section strip steel tension force
Setting value；TactFor withdrawal straightening machine section strip steel tension force actual value, when bearing tension force, TactEqual to negative tension force actual value, positive tension force control
When processed, TactEqual to positive tension force actual value.
Method according to the present invention, in the step (3), tension force analog value that withdrawal straightening machine survey Zhang Yi is obtained
The method for being converted to positive tension force actual value is：
Wherein, T2actFor positive tension force actual value, FRThe rated value of pressure head is used by tensiometer, F is measured by tensiometer
Tension force analog value.
Method according to the present invention, in the step (3), the control to the positive tension force of strip uses proportional integration control
Mode processed.
The beneficial effect that the present invention reaches：1) control method of the present invention is novel, can be widely applied to needs and carries out negative tension force
The place of control, can not only improve pickling section strip steel surface quality, and can also reduce the consumption of support stone, to improve belt steel surface
Quality provides technological means, meets production and technological requirement.
2) the negative tension force of the invention based on tension leveler torque, the volume of tension force etc. is born without separately increasing newly for measuring strip
External equipment, therefore low cost, can be that enterprise saves cost.
3) present invention is adapted to the place using vector converter, adaptable, may extend to the life using vector converter device
Producing line, has wide promotional value.
4) control method of the invention can reduce product degradation losses, support stone renewal cost be reduced, so as to improve enterprise
Economic benefit.
Brief description of the drawings
Fig. 1 is strip acid tandem rolling process unit；
Fig. 2 is the control principle drawing of the present invention；
Fig. 3 is the control method flow chart of the present invention.
Embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
Such as Fig. 1, sour tandem rolling process unit includes withdrawal straightening machine body 1, first tension roll assembly 1a, 1b, 1c, withdrawal straightening machine and surveys Zhang Yi
2, second tension roll assembly 3a, 3b, 3c, descaling bath body 4, front and rear pinch roller 4a, 4b, support stone 4c, the 3rd tension roll assembly 5a, 5b and
Descaling bath surveys an instrument 6.Withdrawal straightening machine surveys the strip tension value that an instrument 2 is used to measure withdrawal straightening machine section, and descaling bath body 4 is used for strip
Pickling is carried out, each tension roll assembly is used for withdrawal straightening machine and the strip of descaling bath produces tension force.The present invention control method by adjusting
The strip tension of withdrawal straightening machine section makes strip tension in descaling bath reach sets requirement, using withdrawal straightening machine frequency converter and PLC to straightening
The strip tension of machine section is controlled.The specific embodiment of control method of the present invention is described in detail below.
Such as Fig. 2, the present invention sets indirect tension measuring appliance A5, negative tension controller A4, direct tonometry device in PLC
A7, positive tension controller A6, selector A3, given tension device A1 and tension force setting adapter A2.Wherein, tension force setting adaptation
Device, rule of thumb predefines the strip tension value at descaling bath and withdrawal straightening machine, and is stored in PLC；Given tension device, according to
Tension force sets the output valve of adapter, calculates the tension force between withdrawal straightening machine tension force setting value and tension roll assembly；Selector, according to tension force
The output valve of given device, carries out logical process, the negative tension controller of selection input, or positive tension controller；Direct tension force is surveyed
Measuring device, is digitized processing to withdrawal straightening machine tensiometer signal, is converted into the corresponding tension force of strip；Positive tension controller, according to
Selector puts into operation, " just " given tension value of acquisition given tension device output, the output valve of more direct tonometry device,
Using proportional plus integral control, output speed adjustment amount gives withdrawal straightening machine frequency converter, realizes direct tension control；Indirect tension measures
Device, obtains the moment values of withdrawal straightening machine frequency converter and is converted into the tension force of strip；Negative tension controller, puts into according to selector and transports
OK, obtain " negative " given tension value of given tension device output, be converted into negative moment amplitude limit value, be sent to withdrawal straightening machine frequency converter into
Row torque closed-loop control, realizes negative tension force function indirectly；Withdrawal straightening machine frequency converter, periodically sends tension leveler torque in real time
Value, rotating speed, and receive motor for withdrawal ＆ straightening machine speed preset value, negative moment amplitude limit value.
As shown in figure 3, the control method of the present invention includes the following steps：
(1) tension force setting adapter is according to the sectional area of strip and the relation of tension force, establish in descaling bath strip tension and
Withdrawal straightening machine section strip steel tension force static table, and the static table is stored in PLC memories, the static table of foundation is as follows：
The total tension of strip is substantially proportional with its cross-sectional area, and the total tension of strip is multiplied by transversal by unit tension
Area obtains, and the tension force of strip unit cross-sectional area is unit tension.
(2) given tension device calculate the sectional area of strip according to the strip steel specification that will enter sour tandem rolling process unit,
Tension force static table in search step (1), determines strip tension Bg (2) in withdrawal straightening machine section strip steel tension force Bg (1) and descaling bath, and
Withdrawal straightening machine section strip steel tension force setting value is obtained, detailed process is as follows：
T4=Bg (2)
T1=Bg (1)-Bg (2)-(T2+T3)×0.95
Wherein, Bg (1) is the withdrawal straightening machine section strip steel tension value that search static table obtains, and Bg (2) obtains for search static table
Descaling bath in strip tension value, T1For withdrawal straightening machine section strip steel tension force setting value, T2For withdrawal straightening machine the 3rd jockey pulley 1c and the 4th
Strip tension setting value between power roller 3a, T3For the strip tension setting value between the 4th jockey pulley 3a and the 5th jockey pulley 3b, T4For
Strip tension setting value in acid tank.
(3) selector carries out logic judgment to the output valve of given tension device, judges the withdrawal straightening machine of given tension device output
Section strip steel tension force setting value is more than 0, is also less than 0.
(4) if the withdrawal straightening machine section strip steel tension force setting value of given tension device output is less than 0, the negative tension force of selector selection
Controller carries out strip negative tension force, realizes the function of strip tension raising more than 10% in descaling bath.Negative tension force
Process is as follows：
1) bear tension controller and obtain withdrawal straightening machine section strip steel tension force setting value and the withdrawal straightening machine turn that withdrawal straightening machine frequency converter is sent
Withdrawal straightening machine section strip steel tension force setting value is converted into the motor negative moment amplitude limit value of withdrawal straightening machine by speed value, negative tension controller, according to
The motor negative moment amplitude limit value and the rotating speed of motor obtain the given value of current value of withdrawal straightening machine frequency converter, and are sent to withdrawal straightening machine
Frequency converter, amplitude limit control is carried out to motor for withdrawal ＆ straightening machine torque.
Motor for withdrawal ＆ straightening machine negative moment amplitude limit value is：
Wherein, M is negative moment amplitude limit calculated value, and D is roller diameter, and Gr is gear-box gear ratio, T1For withdrawal straightening machine section strip steel
Power setting value
The given value of current value of withdrawal straightening machine frequency converter is：
Ispc_min=-Iq
Wherein, Ispc_minIt is the amplitude limit setting value of withdrawal straightening machine inverter current controller, IqIt is the torque electricity of motor for withdrawal ＆ straightening machine
Flow valuve.IWithdrawal straightening machineFor withdrawal straightening machine rated current, PWithdrawal straightening machineFor withdrawal straightening machine rated power, n is the actual speed of motor for withdrawal ＆ straightening machine.
When carrying out amplitude limit control to motor for withdrawal ＆ straightening machine torque, motor for withdrawal ＆ straightening machine speed ring is in saturation state, by straightening
Electromechanical machine speed preset a reference value adds a stack velocity, and the motor for withdrawal ＆ straightening machine speed preset value of additional stack velocity is sent out
Withdrawal straightening machine frequency converter is given, makes to realize withdrawal straightening machine frequency converter speed all the time there are deviation between withdrawal-straightener speed actual value and set-point
Degree ring is saturation state, output valve 100%.To make motor for withdrawal ＆ straightening machine speed ring be in the motor for withdrawal ＆ straightening machine speed of saturation state
Set-point is：
Vset=Vline+Voveride
Wherein, VsetMotor for withdrawal ＆ straightening machine speed preset value to make motor for withdrawal ＆ straightening machine speed ring be in saturation state gives；
VlineFor motor for withdrawal ＆ straightening machine speed preset a reference value；VoverideFor stack velocity, 10~50mpm of value range.
2) indirect tension measuring appliance obtains the moment values for the withdrawal straightening machine frequency converter that withdrawal straightening machine frequency converter is sent, and is converted into band
The negative tension force actual value of steel, i.e.,：
I1=I3-I2
Wherein：T1actFor negative tension force actual value, I2For withdrawal straightening machine moment of accelerating electric current, C1For moment of accelerating conversion coefficient,
JWithdrawal straightening machineFor withdrawal straightening machine rotary inertia, D is roller diameter, and Gr is gear-box gear ratio, PWithdrawal straightening machineFor withdrawal straightening machine rated power, NWithdrawal straightening machineFor straightening
The rated speed of electromechanical machine,For withdrawal straightening machine acceleration magnitude, I1、I3Respectively withdrawal straightening machine section strip steel establishes torque electricity needed for tension force
Stream, motor for withdrawal ＆ straightening machine actual measurement torque current.
3) by the negative tension force actual value of strip compared with tension force setting value, if deviation is less than the tension variation of setting
Value, then complete the negative tension force to strip, otherwise continue step 1), until negative the tension force actual value and setting value of strip
Deviation be less than setting negative tension variation value.
Wherein, Δ T1The deviation of tension force actual value and setting value is born for withdrawal straightening machine section strip steel；T1For withdrawal straightening machine section strip steel tension force
Setting value；T1actTension force actual value is born for withdrawal straightening machine section strip steel.
(5) if the withdrawal straightening machine section strip steel tension force setting value of given tension device output is more than 0, selector selects positive tension force
Controller carries out positive tension force to strip, realizes the function of strip tension raising less than 10% in descaling bath.Positive tension force
Process is as follows：
1) directly tonometry device obtains withdrawal straightening machine and surveys the withdrawal straightening machine section strip steel tension force analog value that Zhang Yi is measured, and carries out
Digitized processing, obtains the positive tension force actual value T of strip2act, i.e.,：
Wherein, T2actFor the positive tension force actual value of withdrawal straightening machine section, FRThe rated value of pressure head is used by tensiometer, F is tensiometer
Measured tension force analog value.
2) positive tension controller uses proportional plus integral control mode, compares the positive tension force actual value of withdrawal straightening machine section strip steel and strip
Tension force setting value, output motor for withdrawal ＆ straightening machine speed adjustment amount to withdrawal straightening machine frequency converter, while PLC sends motor for withdrawal ＆ straightening machine speed base
Quasi- set-point is to withdrawal straightening machine frequency converter, and withdrawal straightening machine frequency converter is by motor for withdrawal ＆ straightening machine speed adjustment amount and motor for withdrawal ＆ straightening machine Velocity Reference
Set-point is combined, and total set-point as motor for withdrawal ＆ straightening machine speed is adjusted motor for withdrawal ＆ straightening machine speed, so as to fulfill right
The positive tension force of withdrawal straightening machine section strip steel is controlled.
ΔT1=T1-T2act
Vtech=KP×ΔT1+∑KI×ΔT1×t2
Vset1=Vline+Vtech
Wherein, VlineFor motor for withdrawal ＆ straightening machine Velocity Reference set-point, set in PLC；VtechFor withdrawal straightening machine section tension force
The speed adjustment amount of device output；Vset1For the total set-point of speed of motor for withdrawal ＆ straightening machine；KPFor proportional gain factor, KIIncrease for integration
Beneficial coefficient, t2For program scanning cycle time.
3) by the positive tension force actual value of strip compared with tension force setting value, if the positive tension force that deviation is less than setting is inclined
Difference, then complete the positive tension force to strip, otherwise continue step 1), until positive tension force actual value and the setting of strip
The deviation of value is less than the tension variation value of setting.
Wherein, Δ T2For the positive tension force actual value of withdrawal straightening machine section strip steel and the deviation of setting value；T1For withdrawal straightening machine section strip steel tension force
Setting value；T2actFor the positive tension force actual value of withdrawal straightening machine section strip steel.
Control method of the present invention is novel, can be widely applied to need the place for carrying out negative tension force, can not only improve acid
Section strip steel surface quality is washed, and the consumption of support stone can also be reduced, technological means is provided to improve strip surface quality, meets life
Production and technological requirement.
Claims (9)
1. the tension control method of cold-strip steel in a kind of acid tandem rolling process, the sour tandem rolling process unit include withdrawal straightening machine,
Withdrawal straightening machine surveys Zhang Yi, descaling bath and descaling bath and surveys Zhang Yi, and the withdrawal straightening machine is arranged on the previous procedure of descaling bath, its feature
It is：The tension control method makes strip tension in descaling bath reach sets requirement by adjusting the strip tension of withdrawal straightening machine section,
The strip tension of withdrawal straightening machine section is controlled using withdrawal straightening machine frequency converter and PLC, the control method step is as follows：
(1) according to the relation of the sectional area of strip and tension force, it is quiet that strip tension and withdrawal straightening machine section strip steel tension force in descaling bath are established
State table, and the static table is stored in PLC memories, strip tension value is acid in the descaling bath stored in the static table
The setting value of strip tension in washing trough；
(2) PLC obtains the sectional area of strip, and the static state described in by search step (1) according to the specification for treating pickled steel strip
Table, obtains strip tension value in withdrawal straightening machine section strip steel tension value and descaling bath, so that it is determined that can reach strip tension in descaling bath
To the withdrawal straightening machine section strip steel tension force setting value of its setting value；
(3) PLC judges the size of withdrawal straightening machine section strip steel tension force setting value, if withdrawal straightening machine section strip steel tension force setting value is less than 0,
Enter step (4)；If the setting value of withdrawal straightening machine section strip steel tension force is more than the tension force that 0, PLC receives withdrawal straightening machine survey instrument measurement
Analog quantity, digitized processing are the positive tension force actual value of strip, and compared with withdrawal straightening machine section strip steel tension force setting value, output is drawn
Machine motor speed adjustment amount is rectified into withdrawal straightening machine frequency converter, withdrawal straightening machine frequency converter is adjusted the speed of motor for withdrawal ＆ straightening machine, real
Now to the positive tension force of withdrawal straightening machine section strip steel, and enter step (6)；
(4) PLC receives the motor for withdrawal ＆ straightening machine actual speed that withdrawal straightening machine frequency converter is sent, and by withdrawal straightening machine section strip steel tension force setting value
The motor negative moment amplitude limit value of withdrawal straightening machine is converted into, straightening is obtained according to the rotating speed of the motor negative moment amplitude limit value and motor
The given value of current value of machine frequency converter, and withdrawal straightening machine frequency converter is sent to, amplitude limit control, realization pair are carried out to motor for withdrawal ＆ straightening machine torque
The negative tension force of withdrawal straightening machine section strip steel；
(5) PLC receives the motor for withdrawal ＆ straightening machine moment values that withdrawal straightening machine frequency converter is sent, and according to the motor for withdrawal ＆ straightening machine moment values
Obtain the negative tension force actual value of withdrawal straightening machine section strip steel；
(6) deviation of withdrawal straightening machine section strip steel tension force actual value and setting value is compared, if the deviation is less than the tension force of setting
Deviation, then complete the control of strip tension in a descaling bath；Otherwise, continue to adjust the tension force of withdrawal straightening machine section strip steel
It is whole, until withdrawal straightening machine section strip steel tension force actual value and setting value deviation are less than the tension variation value of setting, realize in descaling bath
Strip tension control.
2. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that the step
Suddenly in (1), strip tension and withdrawal straightening machine section strip steel tension force static table are in the descaling bath：
3. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that described
In step (2), the method for determining withdrawal straightening machine section strip steel tension force setting value is：
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T4=Bg (2)
T1=Bg (1)-Bg (2)-(T2+T3)×0.95
Wherein, Bg (1) is the withdrawal straightening machine section strip steel tension value that search static table obtains, and Bg (2) searches for the pickling that static table obtains
Strip tension value in groove, T1For withdrawal straightening machine section strip steel tension force setting value, T2Strip between the 3rd jockey pulley and the 4th jockey pulley
Power setting value, T3For the tension force setting value between the 4th jockey pulley and the 5th jockey pulley, T4For strip tension setting value in descaling bath.
4. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that described
In step (4), the method that withdrawal straightening machine section strip steel tension force setting value is converted into motor for withdrawal ＆ straightening machine negative moment amplitude limit calculated value is：
Wherein, M is negative moment amplitude limit calculated value, and D is roller diameter, and Gr is gear-box gear ratio, T1Set for withdrawal straightening machine section strip steel tension force
Value；PWithdrawal straightening machineFor withdrawal straightening machine rated power.
5. the tension control method of cold-strip steel in acid tandem rolling process according to claim 4, it is characterised in that described
In step (4), the given value of current value of withdrawal straightening machine frequency converter is：
Ispc_min=-Iq
Wherein, Ispc_minIt is the amplitude limit setting value of withdrawal straightening machine inverter current controller, IqIt is the torque current of motor for withdrawal ＆ straightening machine
Value, i.e.,：The given value of current value of withdrawal straightening machine frequency converter, IWithdrawal straightening machineFor withdrawal straightening machine rated current, PWithdrawal straightening machineFor withdrawal straightening machine rated power, n is
The actual speed of motor for withdrawal ＆ straightening machine.
6. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that described
In step (5), the method for obtaining negative tension force actual value is：
I1=I3-I2
<mrow>
<msub>
<mi>I</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>d</mi>
<mi>n</mi>
</mrow>
<mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</mfrac>
<mo>&times;</mo>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
</mrow>
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mn>1</mn>
<mi>a</mi>
<mi>c</mi>
<mi>t</mi>
</mrow>
</msub>
<mo>=</mo>
<mo>-</mo>
<mfrac>
<msub>
<mi>I</mi>
<mn>1</mn>
</msub>
<mi>D</mi>
</mfrac>
</mrow>
Wherein：T1actFor negative tension force actual value, C1For moment of accelerating conversion coefficient, JWithdrawal straightening machineFor withdrawal straightening machine rotary inertia, D is roller diameter,
Gr is gear-box gear ratio, PWithdrawal straightening machineFor withdrawal straightening machine rated power, NWithdrawal straightening machineFor the rated speed of motor for withdrawal ＆ straightening machine,For withdrawal straightening machine
Acceleration magnitude, I1Torque current needed for tension force, I are established for withdrawal straightening machine section strip steel2For withdrawal straightening machine moment of accelerating electric current, I3For straightening
Electromechanical machine surveys torque current.
7. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that described
In step (6), the deviation of withdrawal straightening machine section strip steel tension force actual value and setting value is：
<mrow>
<mi>&Delta;</mi>
<mi>T</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mo>|</mo>
<msub>
<mi>T</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>a</mi>
<mi>c</mi>
<mi>t</mi>
</mrow>
</msub>
<mo>|</mo>
</mrow>
<msub>
<mi>T</mi>
<mn>1</mn>
</msub>
</mfrac>
</mrow>
Wherein, Δ T is the deviation of withdrawal straightening machine section strip steel tension force actual value and setting value；T1For the setting of withdrawal straightening machine section strip steel tension force
Value；TactFor withdrawal straightening machine section strip steel tension force actual value；During negative tension force, TactEqual to negative tension force actual value；During positive tension force,
TactEqual to positive tension force actual value.
8. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that described
In step (3), the method that the obtained tension force analog values of withdrawal straightening machine survey Zhang Yi are converted to positive tension force actual value is：
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mn>2</mn>
<mi>a</mi>
<mi>c</mi>
<mi>t</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>F</mi>
<mi>R</mi>
</msub>
<mn>80</mn>
</mfrac>
<mo>&times;</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mi>F</mi>
<mn>16</mn>
</mfrac>
<mo>-</mo>
<mn>200</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, T2actFor positive tension force actual value, FRTo survey the rated value that an instrument uses pressure head, F is the tension force surveyed measured by Zhang Yi
Analog value.
9. the tension control method of cold-strip steel in acid tandem rolling process according to claim 1, it is characterised in that described
In step (3), the control to the positive tension force of strip uses proportional plus integral control mode.
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| CN110576047B (en) * | 2019-09-12 | 2021-03-26 | 湖南华菱涟钢薄板有限公司 | Control method and control system for full-automatic production of pickled plate by cold rolling unit |
| CN111360077B (en) * | 2020-03-03 | 2022-07-15 | 首钢京唐钢铁联合有限责任公司 | Control method for preventing strip steel from throwing into acid tank |
| CN112064047A (en) * | 2020-08-18 | 2020-12-11 | 江苏兴隆防腐设备有限公司 | Be applied to high efficiency acid dip pickle of strip |
| CN112129447A (en) * | 2020-11-25 | 2020-12-25 | 中国重型机械研究院股份公司 | Tension-straightening tension measuring device, system and method for strip cleaning tension-straightening unit |
| CN114160587B (en) * | 2021-12-02 | 2024-02-09 | 宝信软件(安徽)股份有限公司 | Method for controlling strip steel tension to be stable in acceleration and deceleration process |
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| JPS59145788A (en) * | 1983-02-08 | 1984-08-21 | Kawasaki Steel Corp | Method and device for pickling steel strip |
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