SU1227278A1 - Arrangement for regulating the tensioning of strip in cold rolling mills - Google Patents

Description

The output of the modulus of elasticity, width and thickness of the rolled strip and the mill acceleration, and the output with the input of the clock generator and the first input of the storage unit, the second input of which is connected to the output of the clock generator of the third input with the output of the mill accelerator, and the outputs - with the corresponding inputs of the digital-analog converter, the output of which is connected to the input of the unit. the multiplication, the other input of which is connected to the output of the calculation of the magnitude of the steady-state dynamic component of the current of the motor winder. KHj, and the output is with the current regulator input of the motor winder.

2. The device according to claim 1, characterized in that the block for calculating the curve of the dynamic component of the current of the motor winder core contains a threshold element, a generator, a block of permanent memory, the first calculating node, the first multiplying block, the second multiplying block, the second calculating node , third multiplier block, first nonlinear converter, second nonlinear converter, divider, first adder5 fourth multiplier block, second adder, fifth multiplier block, pulse shaping unit, threshold element, The output of the generator is connected to the first input of the pulse shaping unit and the input of the permanent memory unit, the output of which is connected to the first input of the first computation node, the second input of which is connected to the output of the first multiplier: a solid block, the inputs of which are connected to the outputs of the control units of the elastic modulus of the rolled lanes and acceleration values of the mill, the output is third

I

The invention relates to the automation of rolling production, in particular to devices for adjusting the tension of the strip.

The aim of the invention is to improve the control accuracy of the nat multiplying unit connected to the third input of the first computation node and the first input of the second computation node, the second input of which is connected to the output of the first multiplying unit, the third input to the output of the coil radius, fourth and fifth the inputs are with the outputs of the width setting units and the LITTLE LINES of the rolled strip, the sixth input of this block is connected to the output of the fixed memory block, and its output is connected to the inputs of the first and second non-linear converters and the first the divider input, the second input of which is connected to the output of the tachogenerator cell, and the output from c; the first input is the input of the fourth multiplier of the iHoro block ,, BTi: p: jft whose output is connected to the top of the second nonlinear converter 5 and the output is connected to codes of the first adder, the other input of which is connected to the output of the first nonlinear converter, and vypsod - the first input of the second multiplying unit, the second input of which is connected to the output of the first calculating node, and the output - to the input of the second adder The first input of the third multiplying unit is connected to the output of the coil radius calculation unit, and the second input of this block with the output of the fifth reproduction block, the first input of which is connected to the output of the unit of the elastic modulus of the rolled strip and the second input with the output of the tachogenerator of the stand, the input of the threshold element connected to the output of the unit of the magnitude of the mill acceleration, and its output to the generator input and the second input of the pulse shaping unit, the output of which is connected to the inputs of the clock pulse generator and b. minani

strip and reduce the number of breaks it during periods of acceleration and deceleration of the mill.

FIG. 1 is a block diagram of a strip tension control device in cold rolling mills;

31

in fig. 2 is a block diagram of a unit for calculating a curve for changing a dynamic component of a current of a motor of a winder.

The strip tension adjustment device in cold rolling mills contains an adjustable source of voltage 1 on the motor bark of a winder, a regulator 2 of the current of the motor of the coiler, regulator 3 of the excitation current of the motor of a coiler, sensors 4.5 and 6 of the excitation current, current core and voltage on the engine bark of the winder, unit 7 for calculating and storing the coil radius, block 8 for calculating the ratio of the coil radius and motor excitation flow, tachogenerator 9 of the stand, unit 10 for calculating the magnitude of the steady current component to p motor winder setting devices 11,12,13 and 14 modulus of elasticity, width and thickness of rolled strip and acceleration value of the mill, block 15 for calculating the dynamic component component of the current of the motor core of the winder, digital-analog converter 16, block 17 multiplying, a clock generator 18 and a memory unit 19, the inputs of the controller 2 of the motor core current of the winder are connected to the outputs of the sensor 5 current of the motor core of the winder and the unit 8 for calculating the ratio of the roll radius and engine excitation flow, the inputs of the last connection The tachogenerator 9 stands and the sensors 5 and 6 of the core current and voltage on the motor winder, and the output are also connected to the input of the unit 7 for calculating and remembering the roll radius, the other input of which is connected to the output of the sensor coil current exciter 4, and the output - with the input of the unit 10 for calculating the magnitude of the established dynamic component of the motor core of the winder, the other input of which is connected to the output of the tachogenerator of the 9 stand, the inputs of the current regulator 3

day engine winder connected

with the outputs of the sensors 4 and 6 of the excitation current and voltage on the motor bark of the winder, the output of the current regulator 2 of the motor core of the winder is connected to the input of the adjustable source 1 of the voltage on the motor core of the winder, the first input of the unit 15 for calculating the dynamic dynamic curve

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The current of the motor core of the winder is connected to the output of the tacho generator 9 of the stand, the second input to the output of the coil radius calculation unit 7, the third, fourth, fifth and sixth inputs of this unit to the outputs of the setting devices 11,12,13 and 14 elastic moduli the width and thickness of the rolled strip and the magnitude of the mill acceleration, and the output — to the generator input 18 clock pulses and to the input of the memory unit 19, the other input of which is connected to the generator output 18 clock pulses, the third input to the output of the acceleration rate generator 14, and outputs - with the corresponding These inputs are digital-analog converter 16, the output of which is connected to the input of multiplier 17, another input of which is connected to the output of block 10 for calculating the steady-state dynamic component of the motor core of the winder, and the output to the input of the current regulator 2 in the winder motor .

The block 15 for calculating the dynamic component of the current of the motor core of the winder contains a threshold element 20, a generator 21, a constant memory unit 22, a first calculation node 23, a first multiplying unit 24, a second multiplying block 25, a second calculating node 26, a third multiplying unit 27, first nonlinear converter 28, second nonlinear converter 29, divider 30, first adder 31, fourth multiplier block 32, second adder 33, fifth ffacitive block 34, pulse shaping unit 35, with the output of generator 21 connected to ne By the first input of the pulse shaping unit 35 and the input of the permanent memory unit 22, the output of which is connected to the first input of the first calculation unit 23, the second input of which is connected to the output of the first multiplying unit 24, the inputs of which are connected to the outputs of the setting units 11 and 14 of the elastic modulus of rolling . bandwidth and acceleration of the mill, the output of the third multiplier unit 27 is connected to the third input of the first computing unit 23 and the first input of the second computing unit 26, the second input of which is connected to the output of the first multiplying block 24, the third input to the output of the coil radius 7 calculating unit, the fourth and fifth inputs are with the outputs of setting units 12 and 13 of the width and thickness of the rolled strip; the sixth input of this block is connected to the output of the fixed memory block 22, and its output is connected to the inputs of the first and second nonlinear converters 28 and 29 and the first input of the divider 30, the second input of which is connected to the output of the cogenerator 9’s generator, and the output to the first input of the fourth multiplying unit 32, the second input of which is connected to the output of the second nonlinear converter 29, and the output to one of the first inputs an adder 31, the other input of which is connected to the output of the first nonlinear converter 28, and the output to the first input of the second multiplying unit 25, the second input of which is connected to the output of the first calculation node 23, and the output to the input of the second adder 33, output which with The first input of the third multiplying block 27 is connected to the output of the coil radius calculation unit 7, and the second input of this block is connected to the output of the fifth multiplying block 34, the first input of which is connected to the output of the setting unit 11 of the elastic modulus of the rolled strip and the second the input is with the output of the tachogenerator 9 of the stand, the input of the threshold element 20 is connected to the output of the setting unit 14 of the mill acceleration, and its output to the input of the core 21 and the second input of the pulse shaping unit 35, the output of which is connected to the inputs 18 clock pulse generator and memory unit 19.

The principle of operation of the device is based on the following.

The compensation of the effect of the dynamic component of the current of the electric drive of the coiler on the tension of the strip is carried out in the considered device in accordance with the following relationship:, JR

WITH,

d.Y

 g

F a.v.

(one,

2,, ci V dR

R

(2)

where I h .. - fixed value

about. V

the dynamic component of the motor winder;

 - steady value

dynamic component of tension J

WITH . coefficient of proportionality between current and motor torque; R is the radius of the rollJF is the excitation flow of the engine

L is the moment of inertia of the drive, V is the rolling speed, (L) is the angular velocity of the motor winder.

The general expression for calculating the dynamic component of the coiler drive current, as shown in (3) e, is equal to

B g

1j 4aJl-e 4cosM Sin, t) J,

, l

(one)

 - coefficient of proportionality between advance and specific tension; V is the linear velocity of the strip; . radius of the work roll; f is the distance from the deformation zone to the point of contact by the riot strip

Y is the moment of inertia of the drive, reduced to the shaft of the winder drum;

SQ is the lead of metal in the absence of tension. Produce the necessary action, c values that do not change in the process of rolling and lowering S due to smallness, we obtain an expression for calculating the coefficient of change in the shape of the dynamic component current curve of the motor of the winder K,

 F

, -n, FR-V tm V - - e - (cosjit m,

W

 where / 2% -a-E (1-tVH.; (- Y.R) .n.6 vRat

  G% T 3 J,

As studies have shown, it is sufficient to have a value every 0.05-0.1 s up to a time equal to 0.8-1.0 s from the start of the start (braking), when the transient process of the dynamic component of the motor core current almost ends, t. e. K becomes equal to one.

The device works as follows.

The operator sets the thickness b, width b and the modulus of elasticity of the rolled strip using gauges 11, 12 and 13 before rolling begins. During rolling, when the engine speed is lower than the main excitation current of the engine 1 is maintained equal to the rated current. At - the motor speed is higher, the main regulator 3 of the motor excitation current of the winder, according to a signal from the voltage sensor 6, weakens the flow of the motor, maintaining the voltage on the core equal to the rated voltage.

In order to maintain a given band tension, the magnitude of the current of the motor 1 of the winder motor varies according to formulas (1) and (2), Ratio. R / F is calculated using signals from sensors 5 and 6 of the core current and voltage on the engine bark of the winder and tachogenerator 9 of the stand, the signal of which is proportional to the linear speed of the V band, in block 8, and the roll radius R in block 7, where the non-linear dependence of the motor flux on the excitation current 1 is used for this. Taking into account the values of R, V and B in block 10, the signal F y is calculated to compensate for the dynamic component of the motor core current, which in block 17 is multiplied by the coefficient of the curve of the change in the dynamic component of the motor core K, coming from the digital output analog converter 16, Moreover, the value of Kf in established modes is equal to one.

When a signal is proportional to the acceleration of the mill, at the output of the setting device 14, the threshold element 20 generates a signal triggering the generator 21, which generates a sequence of 8 or 10 pulses. Each pulse connects the corresponding cells of the constant memory unit 22, in which the values i .., t jl-f are stored (t is the time from the beginning

2272788

start-up of the mill, with t- -i -, - 0.05-0.1 s), to the inputs of the first 23 and second 26 computation nodes. In the first

the computation node for the t- and

I j

5 products of the modulus of elasticity E of the strip by the acceleration 3, which comes from the output of the first multiplying unit 24, and the modulus of elasticity E, the speed of the mill V and the radius of the coil R,

0 which comes from the third multiplier block 27, the values are calculated.) E iEVRt-h, aEt g

the second node 26 calculates using the signals E it E tt, EVft, & N B, Rn which receive 5 respectively t outputs of the fixed memory block 22, the first multiplying block 24, the third multiplying block 27, setpoint 12 and 13 widths and thicknesses rolled

2Q bands and a block, 7 definitions of the coil radius, the values A, / it) are calculated by which, as well as the value of the signal coming from the tacho generator 9 of the stand and proportional

25 the speeds of the mill V, using nonlinear converters 28 and 29, splitter 30, the fourth of the multiplier block 32 and the first adder 31 calculate the sums

thirty

F (t) Cos, t.-m --SinAt. .

t t1 AI

The second multiplier block 25 calculates the output F (t j-J-F vt;), and the second adder 33 forms the values of the coefficients of the shape curve of the dynamic component of the current core of the motor winder K -.

On the falling edge of each pulse generated by the generator 21, the values Kf |

from the output of the second adder 33 in the block; 19 memorization. In addition, on the trailing edge of the first pulse of the generator 21 in the pulse shaping unit 35, a signal is produced from,,

which starts 18 clock pulse generator. The signal cj, the start of the generator of clock pulses, also increases at the end of the acceleration (deceleration) of the mill as soon as

the acceleration 3 becomes zero, the threshold element 20, and the pulse shaping unit 35.

The arrival of the first pulse from the generator 18 from the outputs of block 19

storing information corresponding to the first value K goes to DAL 16. The analog signal from the multiplication DAC output in block 17 multiplied by the value of G is the product of these values from its output goes to regulator 2 of the main current, where the corresponding change is made to set changed As the next pulses from the generator 18 in the Mf block are received, the new values are received, and their product enters the regulator 2.

Thus, in the initial stage of the process of acceleration of the mill, compensation of the influence of the dynamic component of the motor core of the winder on the tension of the strip is carried out using formula (3), and after 0.8-1 s after the start of acceleration, using formula (1) and (2).

At the end of the acceleration of the mill, when the signal proportions to its acceleration a disappears, the generator 18 is restarted and signals are transferred from the storage unit 19 to the digital-to-analog converter 16. Signals that are proportional to Kf are

exponent decreases to zero. Such a sequence of signals K is output by the memory unit 19 when simultaneously receiving clock pulses from the generator. 18 and signal

and 0 from setter 14 of the camp.

When braking the mill, the operation of the device does not differ from that described above.

Thus, the proposed strip tension adjustment device in cold rolling mills will improve the accuracy of tension stabilization, reduce the number of strip breaks and, consequently, the downtime of the mill, which will increase its productivity.

f-tJg. f

Fig 2

VNIIPI Order 2242/8 Circulation 518

Random polygons pr-tie, Uzhgorod, st. Project, 4

Subscription

Claims (2)

1. DEVICE FOR REGULATING THE STRIP TENSION IN THE COLD ROLLING STATIONS, containing an adjustable voltage source at the armature of the winder motor, current regulator for the armature of the winder motor, current regulator for the excitation motor of the winder, sensors for exciting the armature current and voltage at the anchor of the winder, calculation unit and storing the radius of the coil, a unit for calculating the ratio of the radius of the coil and the yotok of the excitation of the engine, a tacho stand and a unit for calculating the value of the steady-state dynamic component of the current of the armature of the motor and the inputs of the winder motor armature current controller are connected to the outputs of the winder motor armature current sensor and the unit for calculating the ratio of the radius of the coil and the excitation flux of the motor, the inputs of the latter are connected to the outputs of the stand tachogenerator and the armature current sensors and voltage of the armature of the winder motor, and the output also connected to the input of the unit for calculating and storing the radius of the roll, the other input of which is connected to the output of the excitation current sensor of the winding motor, and the output to the input of the unit for calculating the steady-state value the dynamic component of the current of the armature of the winder motor, the other input of which is connected to the output of the tacho generator of the stand, the inputs of the excitation current regulator of the motor of the winder are connected to the outputs of the excitation current and voltage sensors on the armature of the winder, the output of the current regulator of the armature of the winder motor is connected to the input of the adjustable a voltage source at the anchor of the winding motor, which is explained by the fact that, in order to increase the accuracy of regulating the tension of the strip and reduce the number of breaks in the periods of acceleration and braking of the mill a, it additionally contains adjusters of the modulus of elasticity, width and thickness of the rolled strip and the value of the acceleration of the mill, a unit for calculating the curve of the dynamic component of the current of the armature of the winder motor, a digital-to-analog converter, a multiplication unit, a clock generator and a storage unit, the first input of the calculation unit the curve of the dynamic component of the current of the armature of the winder motor is connected to the output of the stand tachogenerator, the second input to the output of the roll radius calculation unit, and the third, fourth, fifth and the sixth inputs of this block - with outputs set SU „„ 1227278 sensors of the elastic modulus, width and thickness of the rolled strip and the mill acceleration value, and the output is with the input of the clock generator and the first input of the memory unit, the second input of which is connected to the output of the clock generator, the third input is with the output of the setpoint the acceleration of the mill, and the outputs with the corresponding inputs of the digital-to-analog converter, the output of which is connected to the input of the multiplication unit, the other input of which is connected to the output of calculating the value of the steady-state dynamic component of the current and the engine anchors winded. ki, and the output is with the input of the current regulator of the armature of the winding motor. 2. The device according to claim 1, wherein the block for calculating the curve of the dynamic component of the current of the armature of the winder motor comprises a threshold element, a generator, a read-only memory block, a first calculation node, a first multiplier block, a second multiplier block, a second calculation node the third multiplier block, the first non-linear converter, the second non-linear converter, the divider, the first adder, the fourth multiplier block, the second adder, the fifth multiplier block, the pulse generating unit, a threshold element,. the output of the generator is connected to the first input of the pulse forming unit and the input of the read-only memory block, the output of which is connected to the first input of the first computation unit, the second input of which is connected to the output of the first multiplying unit, the inputs of which are connected to the outputs of the adjusters of the elastic module of the rolled strip and the mill acceleration value , the output of the third multiplier block is connected to the third input of the first calculation node and the first input of the second calculation node, the second input of which is connected to the output of the first multiplier unit, the third input - with the output of the roll radius calculation unit, the fourth and fifth inputs - with the outputs of the gauges of the width and thickness of the rolled strip, the sixth input of this unit is connected to the output of the permanent memory unit, and its output - with the inputs of the first and second nonlinear converters and the first input of the divider, the second input of which is connected to the output of the tacho generator of the stand, and the output is connected to the first input of the fourth multiplier unit, the second input of which is connected to the output of the second nonlinear converter, and the output to One of the input the first adder, the other input of which is connected to the output of the first nonlinear converter, and the output is connected to the first input of the second multiplier unit, the second input of which is connected to the output of the first computation unit, and the output with the input of the second adder, the output of which is connected to the input of the storage unit, the first input the third multiplying unit is connected to the output of the roll radius calculation unit, and the second input of this unit is connected to the output of the fifth multiplying unit, the first input of which is connected to the output of the elastic modulator knob of the second band, and the second input - with the output of the tacho generator of the stand, the input of the threshold element is connected to the output of the accelerator of the mill, and its output is connected to the input of the generator and the second input of the pulse forming unit, the output of which is connected to the inputs of the clock pulse generator and the memory unit. ί