SU1639818A1 - Device for adjusting strip gauge in one-stand cold mill - Google Patents

Abstract

The invention relates to the management of rolling production processes, in particular to the regulation of the thickness of a strip in a cold rolling mill. The purpose of the invention is to improve the quality of rolled products by increasing the speed. A correction device is introduced into the device, which allows to take into account the change in the inertia of the object during the rolling process. 1 hp f-ly, 1 ill.

Description

The invention relates to the management of rolling production processes, in particular to the regulation of the thickness of a strip in a cold rolling mill.

The purpose of the invention is to improve the quality of rolled products by increasing the speed of the thickness controller.

The drawing shows a block diagram of the device.

The device contains a single-stalk mill 1, winding 2 and unwinding 3 winders, an unwinding winder electric motor 4 connected to a power supply 5, the input of which is connected to the output of current regulator 6, the first input of which is connected to the output of thickness regulator 7, whose outputs are connected to outputs gauges 8 thickness, installed at the entrance to the mill and its output, and the unit 9 thickness.

Correction unit 10 contains a differentiation unit 11, the output of which is connected to the first input of multiplication unit 12, the output of division unit 13 is connected to C /) by the first input of multiplication unit 14, the second input of which is connected to the first input ™ of the unit, the output of multiplication unit 14 is connected to 5, the first input of the division unit 15, the output of which is connected to the input of the nonlinear converter 16, the output of which is connected to the input of the multiplication unit 17, another input 0s of which is connected to the second input of the multiplication unit CO 14, is connected to the second input of the unit 12 times the QQ output of which is connected to the output of the node, "

the second and third inputs of the node are connected to the QQ inputs of dividing unit 13, the fourth input of the node is connected to the input of differentiating unit 11, the fifth input of the node is connected to the second input of dividing unit 15, the first is the input of the corrective node 10 connected to the output of sensor 18 the rotational speeds of the rolls, the second, third, fourth and fifth inputs of the correction unit Yu are connected to the outputs of the thickness gauges 8, the thickness adjuster 7 and the sensors 19

rotational speed of the motor 4 unwinding winder, the output of the correcting node 10 is connected to the second input of the current regulator and connected to the inputs of the first dividing unit 13, the outputs of which and the sensor 18 of the frequency of rotation of the rolls are connected to the inputs of the unit 14, the output of which and the sensor 19 the winders are connected to the inputs of the dividing unit 15, the output of which through the nonlinear converter 16 is connected to the input of the multiplier 17, to the other input of which the sensor 18 of the frequency of rotation of the rolls is connected, the output nozhitel 17 connected to the input unit 12, the outputs of the setpoint thickness of 9 meters and 8 are connected to the inputs of regulator 7 thickness, whose output is connected to the second input of the current controller 6 of the torus, whose output is connected to the power source input 5.

The device works as follows.

Signals of the strip thickness at the entrance to the stand H and at its exit h are fed to the inputs of the dividing unit 13, and the ratio of the thicknesses h / H is calculated. In block 14, the input speed of the Vn band is calculated by the value of the output speed

Jt

H

The inputs of the dividing unit 15 receive the output of unit 14 — the input speed of the strip Vn and the rotational speed signal of the unwinding winder sh.

In block 15, the Vn / cy R formula is used to calculate the roll radius R on the unwinding winder. Nonlinear converter 16 performs the calculation

V: Vn V

Y b

Re

X () R

where Ro is the radius of the drum;

y-density of the material being wound;

b is the width of the strip

taking into account the moment of inertia of the winder with a roll of 10 and the magnitude of the square of the radius of the roll R.

The multiplier 17 calculates the value

V I 02

Un

which is proportional to the constant time T of the thickness control object. When the signal of the gauge 3 deviates from the value specified behind the sensor 9, a signal appears at the output of the regulator 7,

modifying the current reference of the motor winder. This signal is differentiated in block 11 and multiplied in block 12 by a factor proportional to T. Thanks to this, by

A second component appears in the second input of current regulator 6, which, during its operation, forcefully changes the unwinding speed of the winder, the tension of the strip and the amount of compression. Since the value

0 the additional component is proportional to the value of the time constant T, the thickness change occurs at the same time, regardless of the rolling conditions (speed and roll radius).

5 Thus, by introducing a correction unit, the thickness regulator is increased several times faster than the worst conditions (maximum rolling speed, maximum value of the ratio of the moment of inertia of the coiler with the roll to the square of the coil radius), which improves the quality of the rolled strip.

five

Claims (1)

Claim 1. Device for adjusting the thickness of the strip on a single-stand cold rolling mill, containing two thickness gauges installed respectively at the mill entrance and at the exit, the rotational speed sensors of the mill rolls and the unwinding winder motor, thickness gauge, the output of which is connected to the first input of the thickness regulator, the output of which is connected to the first input of the current regulator, the output of which is connected to the power source, to which the electric motor of the unwinding winder is connected, of which is a0 so that, in order to improve the quality of rolled products by increasing the speed of the thickness controller, it is equipped with a correction unit, the first through fifth inputs of which are connected to the outputs of the rolling speed sensor, thickness sensor, thickness regulator, respectively. and an engine speed sensor of the unwinding winder, and the output is with the second input of the current regulator 52. Device pop. It is distinguishing that the correction node contains a differentiating unit, two division units, three multiplication units and non-linear converter, the output of the first block is connected to the first input of the first multiplication unit, the second input of which is connected to the first input of the second multiplication unit and the first input of the node; the inputs of the first division block are connected to the second 15 and third inputs of the node; the fourth input is connected to the input differentiating unit, the output of which is connected to the input of the third multiplication unit, another input of which is connected to the output of the second multiplication unit, the second input of which is connected to the output of the nonlinear a converter whose input is connected to the output of the second division unit, the first input of which is connected to the output of the first multiplication unit, and the second input to the fifth input of the node, the output of the node is connected to the output of the third multiplication unit. R