SU1585039A1 - Arrangement for adjusting strip thickness - Google Patents

Abstract

The invention relates to the automation of rolling production, in particular to the automation of hot rolling crimping mills with individual drive of the rolling rolls. The purpose of the invention is to reduce the distortion of the transverse profile of the strip in the thickness adjustment process by maximizing the use of the adjustment channel with an impact on the magnitude of the speed asymmetry. The device has an additional unit for calculating the maximum moment difference, as well as the upper roll motor and the lower roll motor speed meter, a pulse sensor. During device operation, due to the maximum use of the thickness control channel by the method of speed asymmetry, a more uniform distribution of rolling force along the strip length occurs, which allows reducing the distortion of the transverse profile of the strip. 2 Il.

Description

The invention relates to the automation of rolling production, in particular to the automation of hot rolling crimping mills with individual drive of the rolling rolls.

The purpose of the invention is to reduce the distortion of the transverse profile of the strip during the thickness adjustment process by maximizing the use of the adjustment channel with an impact on the magnitude of the speed asymmetry.

FIG. 1 shows a block diagram of a device for adjusting the strip thickness; in fig. 2 is a block diagram of the calculation of the set point of the maximum moment difference.

The strip thickness control device contains two blocks 1 and 2 of the control of the roll stand motors, a regulator of 3 moment differences, the outputs of which are connected to the inputs of blocks 1 and 2 of the key roll motor controls, and the input is connected to the first output of the computing block 4, the second output which is connected to the input of the lower roll position controller 5, the first, second and third inputs of the computing unit 4 are connected to

cl

00

cn

about

W

with

the outputs of the meters 6 and 7 of the rolling force and the position of the lower roll and thickness setting device 8, the first and second inputs of the maximum torque difference setting unit 9 are connected to the outputs of the stand roll control units 1 and 2, and the third and fourth inputs are connected to the outputs of the sensor 10 pulses combined with the upper roll motor and the lower speed motor gauge 11, and the output with the fourth input of the computing unit 4, the fifth input of the latter is connected to the output of the pulse sensor 10 coupled to the motor top roll. The output of the regulator 5 of the lower roll position is connected to the inlet of the hydraulic cylinder 12.

Block 9 for calculating the maximum torque difference setting (Fig. 2) consists of two adders 13 and 14, rectifier 15, two blocks 16 and 17 of multiplication, two keys 18 and 19, program block 20, comparison element 21, block 22 subtraction, two relay elements 23 and 24, control unit 25

memory module 26 and functional converter 27.

The device works as follows.

When the metal is fed into the cage in the computing unit 4 (Fig. 1), a discrete signal is formed. Metal in

rolls

1 o

with P / P

Alia

(ABOUT

at Р Р

MMN

When operating in the range of angular velocities of the SU, where syn is the nominal value of the angular velocity of the engine, the output of the functional converter 27 (Fig. 2) has -. There is no place a constant signal proportional to the nominal value of the motor magnetic flux, which is fed to the input of the multiplier 16. In this case, a signal proportional to the summation module of currents jI1 + I2 | . At the output of block 16, a signal is generated

Sll

(II, + IJ),

(2)

where C is the electromechanical constant of the engine.

At the same time, in the comparison element 21, a condition check is performed.

| 1, + I, | "21N Ј

(3)

where Ј - relative compression;

I „motor rated current.

P

When this condition is fulfilled, a negative polarity signal arises at the output of the comparison element 21, which triggers the relay element 23 opening the switch 18. At the same time, the signal calculated by the formula (2) is applied to the input of the adder 14.

- Since the second input of the adder 14 is locked with a signal from the output of the key 19, then the output of the adder 14 is a signal of the maximum setpoint of the difference of moments

4M, P

with „Fn (t1 + i7 |),

(four)

R

min

the current value of the rolling force;

the minimum value is 45, with which you can conduct the rolling process.

Then, at the time points determined by the triggering of the pulse sensor 10, in block 4, the torque difference signal DM is calculated as a function of the mismatch between the current value of the rolling force and its value at the front end, taken as the setpoint.

At the same time, the block 9 for calculating the set point of difference of the moments starts working.

This signal is stored in memory unit 26 for the entire period between successive pulses of sensor 10.

When operating in the angular velocity range W 7U) H, a signal appears at the output of the functional converter 27

Wu

Mtt

A G F -

BAL TN.

to

(five)

Thus, the maximum torque difference setting is inversely proportional to the angular velocity of the engine.

If condition (3) is not met, a positive polarity signal appears at the output of the comparison element 21, the relay element 24 is triggered, the key 19 is opened, and the key 18 is closed. In this case, at the output of the adder 14 and, consequently, at the output of the memory block 26, a signal appears that sets the maximum moment difference in accordance with the expression

LI

m

 (41N lit + M) SLF.

In computational unit 4 (FIG.

lm: and m

(7)

When this condition is fulfilled, the DN signal is applied to the input of the regulator 3 moment differences, which sets blocks 1 and 2 of the engine controls to different settings for the moments M, and Mfl, which causes the output speeds of the blocks 1 and 2 to appear at the peripheral speed of the rolls Vfl and ve corresponding to the required value of the speed asymmetry.

If the condition (7) is not fulfilled, the maximum allowable value of DMt corresponding to the maximum allowable speed asymmetry in this range of the strip length is applied to the input of the regulator 3. Simultaneously, the calculation is performed in block 4 of the control action

4S

ar

3 "A

M,

h

E “A

the strip thickness setting set by the setting unit 8J DR is the uncompensated deviation of the rolling force from the setting on this interval of the strip length; Mk - the modulus of rigidity of the cage; S is the current value of the roll solution before the start of adjustment.

In accordance with the change in the setpoint of the roll, the regulator 5 calls for the displacement of the hydraulic cylinder piston as long as it does not set the position at which

PL M „

 behind

S,

P, new values for rolls and rolling effort.

ten

15

20

25

thirty

35

40

45

50

55

Since the main part of the thickness deviation in this range is compensated by the introduction of the maximum velocity asymmetry, the remaining deviation value is compensated by a small change in the roll gap, which has practically no effect on the transverse profile of the strip.

Formula of the invention

A device for adjusting the strip thickness containing two control units for the roll stand motors, a moment difference regulator whose outputs are connected to the inputs of the stand roll control motors, and the input is connected to the first output of the calculating block, the second output of which is connected to the position regulator input the lower roll, the first, second and third inputs of the computing unit are connected to the outputs by measuring the rolling force and the position of the lower roll and the thickness gauge, respectively, differing in that Reducing the lateral profile distortion in the thickness control process by using the control channel as much as possible with an impact on the speed asymmetry value, it additionally contains a unit for calculating the maximum moment difference setpoint, a pulse sensor coupled to the upper roll motor, and a lower roll motor speed meter, The first and second inputs of the setpoint calculation unit of the maximum moment difference are connected to the outputs of the roll motor control units to fly, and the third and fourth inputs are connected to the outputs of the pulse sensor coupled to the upper roll motor, and the lower speed motor speed meter, from the output to the fourth input of the computing unit, and the fifth input of the latter is connected to the output of the pulse sensor articulated with the engine of the upper roll.

Phage.1

LJb

Claims (1)

’^ Claims A device for controlling the thickness of the strip, containing two blocks 2Q for controlling the roll mill engines, a moment difference regulator, the outputs of which are connected to the inputs of the blocks for controlling the roll mill engines, and the input is connected to the first output of the computational block 25, the second output of which is connected to the input of the lower roll position controller , the first, second and third inputs of the computing unit are connected to the outputs of the measuring instruments of the rolling force and position 30 of the lower roll and the thickness gauge, respectively, characterized in that, with To reduce the distortion of the transverse profile of the strip in the process of controlling the thickness of p35 by maximizing the use of the control channel with an effect on the speed asymmetry, it additionally contains a unit for calculating the setpoint of a maximum of 40 difference of moments, a pulse sensor coupled to the upper roll engine, and a speed meter for the lower roll engine wherein the first and second inputs of the set point calculation unit 45 of the maximum difference in moments are connected to the outputs of the roll motor control units crates, and the third and fourth inputs are connected to the outputs of the pulse sensor, coupled with the upper roll engine, and the speed meter of the lower roll engine, with the output - with the fourth input of the computing unit, and the fifth input of the latter is connected to the output 55 of the pulse sensor, coupled with top roll engine. 1