SU1673234A1 - Device for measuring interstand tension in a continuous strip mill - Google Patents

Abstract

The invention relates to rolling production and can be used to measure and control the tension of a strip between stands of a continuous bar mill. The purpose of the invention is to improve the measurement accuracy due to the effect of the rolling force, due to the implementation of an adaptive algorithm for minimizing tension during the measurement. 2 hp f-ly, 3 ill.

Description

The invention relates to rolling production and can be used to measure and regulate the tension of a strip by cages of a continuous section rolling mill.

The aim of the invention is to improve the accuracy of the tension measurement by reducing the error due to the effect of the rolling force.

Figure 1 shows the block diagram of the device; Fig. 2 is a control block diagram; on fig.Z - diagram of the computing device (WU) ...

In the beds 1 of the stands 1 ... p of the mill of the cushion 2 lower rolls are installed (Fig. 1) on the hinge supports 3. Each stand 1 is equipped with a tension sensor 4 installed between the bed 1, the pillow 2 and the sensor 5 of the rolling force, as well as an adder 6, multiplier 7, memory device (memory) 8, key (K) 9, adder 10, amplifiers 11 and 12, delay element 13 (EZ), computing device

(WU) 14 with three inputs and one output, control unit 15 (CU) with two inputs and one output and a current sensor 16 for the presence of a strip in stand 1 connected to engine 17 of stand 1.

The control unit 15 contains (FIG. 2) elements AND 18 and 19, delay elements 20 and 21, inverters 22 and 23, a trigger 24. The computing device contains (FIG. 3) an adder 25 and a divider 26.

One input of the adder 6 is connected to the output of the tension sensor 4, the second input of the adder 6 is connected to the output 7 of multiplication, the third input of the adder 6 of each stand, except the last one, is connected to the output of the adder 6 of the subsequent stand,

The first input of the multiplier 7 is connected to the output of the sensor 5 rolling force, the second input to the output of the storage device

8, the input of which is connected to the output of the key

9, one input of which is connected to the output of control unit 15, and the other to the output of adder 10, one input of which is connected

w

Yo

About 4

WITH ND CJ -G

with the output of the amplifier 12 Amplifier input 12 is connected to the output of the delay element 13, the input of which is connected to the output of the storage device 8. The second input of the adder 10 is connected to the output of the amplifier 11, the input of which is connected to the output of the computing device 14.

The first input of the computing device 14 is the first input of the divider 26 and is connected to the output of the sensor 5 of the rolling amplifier, and the other two inputs of the computing device 14 are the inputs of the adder 25 and are connected to the outputs of the sensor 4, the tension of the strip and the adder follow and this stand, the output of the adder 25 is connected to the second input of the healer 26.

A trigger 24 (FIG. 2) is connected with its inputs to the outputs of the elements 18 and 19, one of the inputs 22 of the element 18 and 18 is connected directly, and the other through the element 20 delays to the current sensor 16 for the presence of a strip in the cage connected to the engine 17 this cage 1. One of the inputs 23 of the element And 19 is connected directly. and the other through the delay element 21 with the sensor 16 for the presence of the strip in the cage 1 connected with the engine 17 of the previous mill stand.

The device works as follows.

Under the action of the difference in the input and output of each stand 1, the bottom 2 pillow 2 tends to turn relative to the pivot bearing 3 and acts on the load sensor 4.

At the measurement step K (K 1.2 .. J, the tension TI (K) between the cells B and i, i 2, K) is determined on the PYKHODR of the adder 6 of stand I by the formula.

Tm (K) T, (K) «- fl (K) C, (K) Pi (K). P) where T | (K) is the tension between cell i and and 1 in step K;

fl (K) —signal of sensor 1 nat ich cage I on step K:

P | (K) is the rolling force p of stand i at step K;

Ci (K) - the value of the coefficient of proportionality d in step K

The value of Ci (K) and P ((K) is formed at the output of multiplier 7 and subtends to the input of adder 6.,

The value of 1 i (K) arrives at the input of the adder b of stand i. i 2, n from the output of the adder 6 of the subsequent stand i + 1.

For conditions of high-grade continuous rolling, the tension at the inlet and outlet of the mill in the absence of coilers and triebapparatuses is absent T0 Tp O In connection with this

to the input of the adder 6 of the last stand, it is necessary to set the TP (K) 0, therefore, a special setting unit of this value is not needed in the proposed device.

The value of $ (K) enters the adder 6 with

sensor 4 tension of this stand I.

The value of P | (K) enters the multiplier 7 from the sensor 5 rolling force in this stand I.

The value of Ci (K) is set to multiplier 7 using a memory device 8, which comes from the output of the adder 10 with the open key 9. The value of Cj (K) is generated at each measurement step K in the sumspore 10 by the formula

c, (k). (k-1) - (1- /) q (K,) (+ KTj (K)

21

where is the parameter;

Ci (K-1) is the value of the coefficient of proportionality at the previous step K-1, generated at the output of the delay element 13, the input of which is connected to the storage device 8.

Parameter / 3 is the coefficient of the amplifier 12 (0/1). The value C | (K-1) s is supplied to the input of the amplifier 12.

the output of the delay element 13, and the output is the value of / y (K-1), fed to the input of the additional adder 10.

Dm and I (k) + TI (K)

The value (1- /) P, / kV-L is produced at the output of the amplifier 11 with a gain factor (1 - /) and is fed to the input of the adder 10.

The values of the adder 25 of the computing device 14 are supplied with the values $ (K) from the tension sensor 4 of this stand i and T | (K) from the adder 6 of the subsequent stand 1 + 1. The output fl (K) –Ti obtained at the output of the adder 25 (K) is fed to one input of the splitter 2t to the other input of which the value Pi (K) from the sensor 5 is fed to the rolling force of this stand i. Thus, the magnitude

H (K) + T, (K)

R, (K)

the input to the amplifier 11 is generated at the output of the divider 26 of the computing device 14.

Produced by the formula (1) at the output of the adder 10, the value is fed to the input of the storage device only when the open key 9, which is controlled by the control unit 15, is outputted

which set the trigger 24, which has two stable states. With Ri (K) 1, the key 9 is open, with Ri (K) 0, the key 9 is closed.

The transfer of the trigger 24 from one steady state to another is accomplished by applying to its inputs pulses produced by elements 18 and 19, the pulse of the element 18 transferring the trigger 24 to the state RJ (K) 0, and the pulse of the element 19 transferring the trigger to the state Ri (K) - 1.

The signals from the sensors 16 of the presence of the band in the cage 1 take on the step K the values:

11-1 (K)

The 1-lane is located on the 1-1O stand - there is no band in the I- / stand.

And Ck)

1 lane is on stand I;

O - no band in cage I

Suppose that at the time between the steps of measuring K-1 and K, the rear end of the strip leaves the previous stand i-1, i.e. the rear end of the strip is between the cells i-1 and I.

Then at the output of the delay element 21, h i (K-1) 1, at the input of the inverter 23 and (K) 0, at the output of the inverter 23 Ti-i (K) 1, i.e. two signals equal to 1 are received at the inputs of element 19, and a signal 1 is also generated at its output. It is easy to make sure that in any other situation than the described one, two different signals 1 and 0 or the same signals equal to 0, i.e. the output signal of the element And 19 is 0.

For example, at the time point at steps K-1 and K, the strip is rolled in the cage I. At the same time, 1u (K) 1, the output of the inverter is 23 Tm (K) 0, and the output of the delay element 21 is 1n (K-1) 1 i.e. at the output of the element And 19 signal equal to 0. Or at the point in time at steps K-1 and K, the strip in stand i-1 is missing. At this, 1u (k) 0, at the output of the inverter 23 1m (K) 1, and at the output of the element 21, delays 1i (K-1) 0, i.e. at the output of the element And 19 signal equal to 0. Or at the time between steps K-1 and K, the strip is captured by the cage 1-1. At the same time, and (K) 1, at the output of the inverter 23 Tm (K) 0, and at the output of the element 21, the delay li-i (K-1) 0, i.e. the output element And 19 signal equal to 0.

Thus, only when passing the rear end of each lane between the stands 1-1 and I, i.e. when between the measuring steps K-1 and K, the rear end of the strip leaves stand i-1, a pulse is generated at the output of element 19 and transfers trigger 24 to state Ri (K) 1. at which key 9 opens.

At this point in time, the value of the proportionality coefficient Ci (K) in the storage device 8 changes.

Suppose at time

Between the K-1 and K measurement steps, the rear end of the strip leaves this stand I. Then, the output of the delay element 20 is li (K-1) 1, the input of the inverter is 22 li (K) 0. The output of the inverter is 22 1 | (( K) 1,

those. The input element And 18 receives two signals equal to 1, and the signal 1 is also generated at its output. In any other situation than the one described, the inputs of the And 18 element receive two different signals 1 and 0 or

equal signals equal to 0. i.e. the output signal of the element And 18 is equal to 0.

Thus, only at the exit of the rear end of each strip from stand I at the point in time between the measurement steps

K-1 and K, at the output of the element 18, a pulse is formed which transfers the trigger 24 to the state Ri (K) 0, while the key 9 is closed and the value C | (K) in the storage device 8 is not changed.

Since the rear end of each strip first passes the stand i-1, and then stand i, the trigger 24 is first transferred to the state Ri (K) 1, in which it resides until the strip leaves the stand i, after which it is transferred

to the state Ri (K) 0, in which it resides until the rear end of the next strip leaves the i-1 stand.

The change in the value of the coefficient of proportionality Ci (K) occurs at the moment when the rear end of each band passes the gap between cells i-1 and i.

Since the rear tension for the mill is To 0, the output of the adder 6 of stand 1 can be used to control the accuracy of the tension measurement achieved in the device.

Thus, with a change in the operation of the device line of action

the rolling force relative to the hinge bearing, the measurement error associated with this is automatically reduced as each strip is rolled, which prevents the known device from being carried out.

Device can be used

to measure and control the tension of the strip between the stands of continuous billet, section and wire mills. The device compared with the prototype has the following advantages: increases

accuracy of tension measurement by 50%, improves the quality of rolled metal by improving tension control.

Claims (3)

Claim 1. Device for measuring the tension of the strip between the stands of the continuous section rolling mill, containing tension sensors installed in each, except the first one, located between the beds and cushions mounted on hinge supports, rolling force sensors, adders and multipliers, one of the inputs of the adder of this thread is connected to the output of the tension sensor of this stand, the second input of the first adder is connected to the output of the first adder of the next stand, the third input of the adder is connected to The output of the multiplier, one of the inputs of which is connected to the output of the rolling enhancer sensor of the stand, is made in order to improve the measurement accuracy by reducing the error due to the effect of the rolling force, it is equipped with a memory device installed in each stand. vom, key, adder, amplifiers, a computing device, a delay element, a control unit and a current sensor for the presence of a strip in the ladder of the cage connected to the core of the motor of the cage, and the second input of the multiplier is connected output memory device having an input connected to the output switch, one input of which is connected to the output of the control unit, and the other - to yield crate i-l . li-tM The second adder, one input of which is connected to the output of the first amplifier, the input of which is connected to the output of the delay element, the input of which is connected to the output of the storage device, and the second input of the second adder is connected to the output of the second amplifier, the input of which is connected to the output of the computing device, the inputs of which are connected with the outputs of the rolling force sensor, the tension sensor and the first adder of the subsequent stand, respectively, the first and second inputs of the control unit are connected to the current sensor outputs lanes in this and previous cell x, respectively, 2, Device pop. 1, characterized in that the control unit contains two items NOT. two delay elements, two AND elements and an RS flip-flop, the output of which is the output of the block, and the R and 5 inputs of which are connected to the outputs of the first and second logic elements I. the inputs of each of which are through the delay elements and NOT respectively connected to the first and the second block outputs. 3. The device according to claims 1 and 2, characterized in that the computing device comprises an adder and a division unit, the output of which is the output of the computing unit, the first input of which is the first input of the division unit, the second input of which is connected to the output of the adder, inputs which are the second and third inputs of the computing unit. T;., M | T ((f) Fiz.g B (“) 25 (Xk7i (K) 26 U