SU342699A1 - DEVICE FOR REGULATING TENSION STRIP ON THE ROLLING MILL - Google Patents

Description

According to the main author. St. No. 250857, a device for adjusting the tension of a strip on a coiler of a rolling mill is known.

A disadvantage of the known device is that it does not take into account changes in the kinetic energy of the rotating coiler, which occur when the strip is wound due to an increase in the coil radius and, accordingly, a change in the speed of rotation of the drum.

The proposed device is characterized in that a band tension compensation unit is inserted in it at increments of the coil radius consisting of a differentiating amplifier and multiplier, the coiler tachogenerator and the differentiating booster connected to the coil radius determining and storing unit being connected to the multiplier and the output the multiplier is connected to the computing unit to which the mill acceleration sensor is also connected. This allows for greater control accuracy.

The drawing shows a functional diagram of the described device, where: / is an adjustable source of core voltage, 2 is a winder motor, 3 and 4 are operational amplifiers, 5 is a motor drive regulator, 5 and 7 are multipliers, 8 is a roll radius ratio determination unit to the engine flow; 9 — a node for determining and storing the coil radius; 10 — a switching node; 11 — a dynamic tension component separation node, 12 — a multiplier, 13 14 — operational amplifiers, 15 — a stand tachogenerator, 16 — a multiplier, 17 — element deadband, 18 - integrato with high input impedance, 19 - tachogenerator coiler, 20 - tension indication unit, 21 - divider, 22 - tension indicator, 23 - nonlinear converter, 24 - multiplier, 25 - differentiating amplifier, 26 - tension compensation unit radius change, 27 - differentiating amplifier, 28 - multiplier.

Also accept the following letter designations;

and - voltage on the engine bark;

E is electromotive force;

/ - current core motor;

(i) motor excitation current;

i vc is the nominal value of the excitation current;

P is tension;

 - set point tension;

a dy signal to compensate for the dynamic component of the current core;

V is the linear velocity of the strip;

with - angular speed of the motor winder;

R is the radius of the winding roll;

- the moment of inertia of the drive;

dV dt dR dt

-acceleration of the camp;

- tempo change roll radius.

The magnitude of the dynamic current of the motor winder, according to which you need to change the task of the motor current,

I ™ CM F

moreover, taking into account the variable mill speed and variable roll radius,

- L {w -

din -

  dt

dt

in the process of winding a coil in node 26, the rate of increment of the coil radius is determined using a differentiating amplifier 27

 and multiplied in multiplier 28 by an amount corresponding to the angular velocity of the winder. At the input of the multiplier 24 occurs

dV summation of the acceleration signal of the mill with

dR dt

signal with

which is used to receive the signal / din in node II of the device.

The resulting dip signal, multiplied by the value of - calculated in the node determining the ratio of the roll radius to the engine flow, is set in the core current control loop. Thus, the motor current of the winder is changed in accordance with the required dynamic torque to provide the desired tension with a change in the speed of the winder, both during acceleration and deceleration of the mill and during strip winding.

Subject invention

A device for adjusting the tension of the strip on the coiler of a rolling mill according to the ed. St. No. 250857, characterized in that, in order to increase the control durability, a tension change compensation node is introduced into it at increments of the coil radius, consisting of a differentiating amplifier and multiplier, and a tacho generator of a coiler and a differentiating amplifier with which the determiner node is connected to the multiplier and exit