SU1754249A1 - Rolling process rate control system - Google Patents

Abstract

Use: rolling production, high-quality and sheet mills of hot metal rolling. The essence of the invention is a block for setting a pause in the operation of a narrow link 13, time master 12, comparison block 19, automatic command generation block 15, tracking block 11, feeding roller table 1, roughing stands group 2, finishing stands group 3, strip presence sensor on the roller table 4, the band presence sensor in the first stand of the rough group 6, the band presence sensor in the narrow link 14, the rolling time counting unit in the first stand of the rough group 7, the rolling time counting block in the narrow link 15, 2 NO schemes 8.16, the key block 10 , 2 arithmetic units 9,17, schemes delays 18, 3 schemes And 22,24,26, 2 toiggep 21 I scheme OR 25. 14-16-21- 22-23-26-25-12-19-26, 23-24-25-20, 13- 9- 19-26, 6-8-22, 11-24, 6-7-10, 11, 7-9-19, 8-9, 13-9, 11-17-9, 14-15-17, 16-17, 16-18-11. 1 cf f-crystals, 3 ill. tn

Description

The invention relates to rolling production and can be used in automation systems for controlling the rate of rolling.

A known rolling tempo control system comprising a block for setting a pause in a narrow link operation, a time master, the output of which is connected to the first input of the comparison unit, the output of which is connected to the input of the automatic command generation unit, the feeding roller table, the group of roughing stands, the finishing stand group

The disadvantage of this system is the inaccurate determination of the slab length in the first roughing stand, which leads to the appearance of an error when calculating the strip length at the exit from the finishing group of stands and then when calculating the strip rolling time in a narrow link. In the known system, when calculating the rolling technological cycle, the difference between the actual and estimated rolling time of the strip in a narrow link, caused by the spread of their length and the instability of the technological process, is also not taken into account. These flaws cause unstable maintenance of a given pause in a narrow link.

Closest to the present invention is a rolling rate control system containing a block for setting a pause in a narrow link, a time delay, the output of which is connected to the second input of the comparison unit, the output of the comparison unit is connected to the input of the automatic command generation unit, tracking unit, feed roller, group roughing stands, a group of finishing stands,

A disadvantage of the known system is the inaccuracy of the calculation of the strip rolling time in a narrow link. This is due to the impossibility of accurately determining the slab length in the first rough circuit, which leads to an error when calculating the strip length at the exit from the finishing group of stands and then when calculating the strip rolling time in a narrow link. The presence of inaccuracy affects the stability of maintaining the specified pause in the work of a narrow link, and therefore causes a decrease in productivity.

The purpose of the invention is to improve the accuracy of the system control the rate of prokztki while increasing the productivity of the mill.

The goal is achieved by the fact that in a known rolling rate control system, which contains a block for setting a pause in a narrow link, a time master, the output of which is connected to the input of the comparison unit, the output of the comparison unit is connected to the input of the automatic command generation unit, the tracking unit that feeds the roller, group of roughing stands, group of finishing stands, additionally introduced

strip presence sensor on the delivery roller table, strip presence sensor in the first stand of the draft group, strip presence sensor in the narrow link, block of rolling time in the first grid of the draft group, counting block

0 time in a narrow link, two schemes NOT, block of keys, two arithmetic devices, delay circuit. At the same time, the output of the band presence sensor on the feed roller table is connected to the second input of the automatic generation unit, the output of the band presence sensor in the first stand of the rough group is connected to the input of the block by rolling time in the first stand of the rough group and to the input of the first circuit. Output

0 of the rolling time counting unit in the first stand of the rough group is connected to the first input of the first arithmetic unit and to the first input of the key block, the output of the first circuit is NOT connected to the second input

5 of the key block, with the second input of the first arithmetic unit and the third input of the automatic generation unit, the Key block output is connected to the first input of the tracking unit, the first output

The tracking unit 0 is connected to the fourth input of the automatic command generation unit. The first output of the automatic command generation unit is connected to the time master input, the output of the pause task block

5, the work of a narrow link is connected to the third input of the first arithmetic unit. The output of the band presence sensor in the narrow link is connected to the second input of the tracking unit, with the input of the rolling time counting unit in

0 narrow link and the input of the second circuit is NOT. The output of the rolling time counting unit in a narrow link is connected to the first input of the second arithmetic unit, the second input of which is connected to the second output

5 of the tracking unit, the output of the second circuit is NOT connected to the third input of the second arithmetic unit, to the fifth input of the automatic command generation unit and to the input of the delay circuit, the output of which is connected to the third input of the tracking unit. The output of the second arithmetic unit is connected to the fourth input of the first arithmetic unit, the output of which is connected to the second input of the comparison unit,

5 In this case, the automatic command generation unit is made from the control of the feeding roller table, three AND schemes, two triggers and the OR scheme, and the input of the automatic command generation unit is connected to the first input of the first AND scheme, the second input of which is connected to the forward output of the first trigger, the inverse output of which is connected to the first input of the second circuit AND, the second input of which is connected to the fourth input of the block. The output of the second AND circuit is connected to the first input of the OR circuit, the output of which is connected to the first output of the block and the first input of the control circuit of the feeding roller table, the output of the first AND circuit is connected to the second input of OR. The second input of the control circuit of the feed roller is connected to the second input of the block, the fifth input of the block is connected to the S input of the second trigger, the direct output of which is connected to the first input of the third AND circuit, the second input of which is connected to the third input of the block, and the output to S -input the first trigger.

FIG. 1 to 3 are block diagrams of a rolling rate control system.

The system consists of a feeding roller table 1, a rough group of 2 stands, a finishing group of 3 stands, a sensor 4 for the presence of a strip on the feeding roller table, a block 5 for automatic generation of commands by the sensor 6 for the presence of a strip in the first stand of the rough group, a block 7 for counting rolling time for the first rough cages, HE schemes 8, first arithmetic unit 9, key block 10, tracking block 11, time setting 12, block pause setting in the narrow link, strip 14 in the narrow link, rolling time count 15 in the narrow link, diagrams NOT 16, second Rhymetric device 17, delay circuit 18 and comparison block 19, Automatic command generation block 5 consists of a control system for the feed roller 24, three AND 20.22 and 26 circuits, two triggers 21 and 25, and OR 23 circuit. lanes on the delivery roller table 1 is connected to the second input of the automatic command generation unit 5. The output of the sensor 6 presence of the strip in the first stand of the rough group 2 is connected to the input of the rolling time counting unit 7 in the first stand of the rough group and to the input of the HE scheme 8. The output of the rolling time counting unit 7 in the first stand of the rough group is connected to the first input of the first arithmetic unit 9 and with the first input of a block of 10 keys. The output of the HE 8 circuit is connected to the second input of the key block 10, to the second input of the first arithmetic unit 9 and to the third input of the automatic command generation block 5 The output of the key block 10 is connected to the first input of the tracking block 11, the first output of the tracking block 211 is connected to the fourth input of the block 5 automatic command generation, the first output of the automatic command generation unit 5 is connected to the input of the time clock 12, the output of which is connected to the first input of the comparison block 19. The output of the block 13 for setting a pause in the narrow link operation (finishing Uppa 3 stands) is connected to the third input of the first arithmetic device 9 The output of the strip 14 sensor in the narrow link is connected to the second input of the tracking unit 11, to the input of the rolling time counting block 15 in the narrow link and to the input of the H 16 circuit. rolling time in a narrow link is connected to the first input of the second arithmetic unit 17, the second input of which is connected to the second output of the tracking unit 11. The output of the NOT circuit 16 is connected to the third input of the second arithmetic unit 17, to the fifth input of the automatic command generation unit 5 and to the input of the delay circuit 18, the output of which is connected to the third input of the tracking unit 11. The output of the second arithmetic unit 17 is connected to the fourth input of the first arithmetic unit 9, the output of which is connected to the second input of the comparison unit 19. The output of the comparison unit 19 is connected to the first input of the automatic command generation unit 5. The first input of the automatic command generation unit 5 is connected to the first input of the first circuit AND 20, the second input of which is connected to the direct output of the first trigger 21, the inverse output of which is connected to the first input of the second circuit 22, the second input of which is connected to the fourth input of the block 5. The output of the second circuit AND 22 is connected to the first input of the OR circuit 23, the output of which is connected to the first output of block 5 and the first input of the control circuit of the feeding roller conveyor 24 The output of the first circuit AND 20 is connected to the second input of OR 23, the second input of the control circuit The roller table 24 is connected to the second input of block 5, the fifth input of block 5 is connected to the S input of the second trigger 25, the direct output of which is connected to the first input of the third circuit And 26, the second input of which is connected to the third input of the block 5, and the output with the S input of the first trigger 21.

The system works as follows.

In the initial state, in the absence of a workpiece on the delivery roller table 1, the signals at the outputs of the sensors 4.6 and 14 are absent. Triggers 21 and 25 are in the logical O state. In this case, there is no signal at the direct outputs of the triggers, and a signal at the inverse outputs. From the inverse output of the trigger 21, the signal is fed to the first input of the circuit A 22

When the front end of the billet (1,2,3 ..), coming out of the heating furnace, approaches, a signal appears at the output of the ribbon 4 at the output, which arrives at the second input of the control system of the feed roller 24. The feed roller 1 stops. The operator’s turning on the feed roller 1 is carried out manually only once before starting to roll the slab for the new size of the finished one. When the workpiece enters the first roughing stand, the sensor for the presence of a strip is triggered. first nulls the contents of block 7 by counting the time and then starts it up again. The time counting unit 7 starts counting the rolling time of the workpiece in the first roughing stand. At that moment, when the workpiece leaves the rolls of the first roughing stand, the signal at the output of the b strip sensor disappears and the time counting unit 7 stops counting the rolling time. From the output of this block, the rolling time information in the first roughing sheet arrives at the first input of the first arithmetic device 9. At the same time, a signal appears at the output of the HE 8 circuit, which is used to rewrite the information on the rolling time of the first workpiece in the first roughing stand through the key block 10 to the first input of the tracking block 11. The next (2nd) strip of the first stand of the strip by the signal of the presence of the strip 6 through the NOT 8 circuit in the tracking unit 11 again records the rolling time of the 2nd workpiece in the first roughing stand, and the rolling time of the first strip advances in the tracking block 11, etc.

When the strip approaches a certain point of the mill, which is selected in advance, the signal from the first output of the tracking unit 11 is sent to the second input of the AND 22 circuit. At the output of the AND 22 circuit, there is a signal that passes through the OR 23 circuit to the control circuit of the feeding roller table 24 and to the input of the setter 12 time. The feed roller 1 is turned on and the second billet that is waiting for rolling on it is fed to the first roughing stand. The signal from the output of the OR circuit 23 is set to the time 12 and then re-starts counting time (i.e. the moment of the beginning of leaving the workpiece from the roller table). After rolling the second mill in the first roughing stand, the information about the time of its rolling is copied to the tracking unit 11 and as it moves along the mill line, it synchronously advances in the tracking unit 11.

Thus, the rolling time of each workpiece in the first roughing stand is rewritten into tracking unit 11 and is accompanied therein simultaneously with the advance of the strip along the mill line.

Using the block 13 for setting a pause in the work of a narrow link, the operator enters into the first arithmetic unit 9 the required pause between the lanes in the narrow link or at the output of the finishing group 3.

At the moment when the first workpiece enters the rolls of the last stand of finishing group 3, a signal appears at the output of the strip presence sensor 14. The time counting unit 15 starts counting the rolling time of the first workpiece in the last finishing stand. This information is fed to the first input of the second arithmetic unit 17. The signal from the strip presence sensor 14 when the first () strip leaves the last finishing stand is controlled to issue information about the rolling time of the 1st (i-th) workpiece in the first roughing stand to the second output tracking unit 11, from where it arrives at the second input of the second arithmetic device 17. At the same time, the input signal of the NOT 16 circuit appears, giving the command to start the second arithmetic unit 17 and the signal to the input of the delay circuit 18 The holder enters the third input of the tracking unit 11. It allows you to hold at the second output of the tracking unit 11 information about the time of rolling the workpiece in the first roughing stand. This information is stored at the second input of the second arithmetic device 17 for a certain period of time necessary to calculate the gear ratio K, the second arithmetic device 17 calculates the gear ratio K by the formula

- &

about)

where 1C is the rolling time of the workpiece in a narrow link (in the last finishing stand),

ti is the rolling time of the workpiece in the first roughing stand.

The value of the transfer coefficient K is fed to the fourth input of the first arithmetic unit 9.

At the moment when the next i-th workpiece leaves the rolls of the first rough stand, a pulse signal starts at the output of the HE 8 circuit and triggers the first arithmetic unit 9 from the second input.

The first arithmetic unit 9 calculates the rolling cycle time of the 1st workpiece in the last finishing stand using the formula

TC-tn-iKti1.

(2)

where tn is the specified pause time between the lanes in a narrow link (at the exit from the finishing group of stands);

ti is the rolling time of the 1st blank in the first roughing stand;

K - transfer coefficient

The value of the calculated value of TC comes to the second input of the block 19 of the comparison.

At the moment when the first workpiece leaves the last finishing stand rolls, the trigger 25 is set to the logical 1 state. When the 1st blank leaves the first roughing stand from the output of the circuit 26, the signal goes to the first input of the trigger 21 and sets it to the logical 1 state. At the same time, at the direct output of flip-flop 21, the signal of logical 1 is set, and at the inverse, the signal of logical O. From this moment, the feeding roller conveyor 1 is controlled through AND circuit 20.

At the approach (M) of the billet to the first roughing stand, at the time of its fixation by the strip sensor 44, the feed roller 1 stops. During the readout by the picker 12 of the rolling cycle time of the 1st billet Tc1, a signal appears at the output of the comparison block 19, which through the AND 20 circuit and the OR 23 circuit passes into the control circuit of the feed roller table 24. The feed roller table 1 turns on and the next billet enters rolls of the first stand of roughing group 2.

Starting from this moment, the system automatically adjusts the rate at which billets arrive in the first stand of rough group 2, taking into account the estimated time of the rolling cycle of the previous billet. In this case, the pause between the bands in a narrow link or at the mill output remains constant, equal to a given one, which does not depend on the length of the original billet.

Thus, the use of the proposed system makes it possible to more accurately calculate the strip rolling time in a narrow link, which leads to a reduction in the pause spread in the work of the finishing group, i.e., makes it more stable and, consequently, increases the mill productivity by approximately 0.01%.

Claims (2)

1. The system of controlling the rate of rolling mainly on stans with feed roller tables of roughing and finishing stands, containing a block for setting a pause in a narrow link, time master, the output of which is connected to the first input of the comparison unit, the output of which is connected to the first input of the automatic command generation unit, the tracking unit that improving the control rate of rolling and 0 increase in mill productivity, it is equipped with a strip presence sensor on the supplying roller table, a strip presence sensor in the first stand of the draft group, a strip presence sensor in the narrow section, 5 by a rolling time counting unit in the first stand of the rough group, a rolling time counting unit in a narrow link, two NOT schemes, a key block, two arithmetic devices, a delay circuit, and 0, the output of the strip presence sensor on the feeding roller table is connected to the second input of the automatic command generation unit, the output of the strip presence sensor in the first stand of the rough group is connected to the input of the rolling time counting unit in the first stand of the rough group and the input of the first circuit NOT output of the rolling time counting unit to the first stand of the draft group is connected to the first input of the first arithmetic 0 of the device and with the first input of the key block, the output of the first circuit is NOT connected to the second input of the key block, the second input of the first arithmetic unit and the third input of the arithmetic instruction block, the output of the key block is connected to the first input of the tracking block, the first output of the tracking block connected to the fourth input of the automatic command generation unit; the first output of the automatic command generation unit is connected to the time master input; the output of the block for setting a pause in the narrow link operation is connected to the third input of the first arithmetic unit, the output of the sensor presence of the band 5 in the narrow link is connected to the second input of the tracking unit, to the input of the rolling time counting block in the narrow link and the input of the second NOT circuit, the output of the rolling time counting block in the narrow link is connected to the first 0 input of the second arithmetic unit, the second input of which is connected to the second output of the block of convergence, the output of the second circuit is NOT connected to the third input of the second arithmetic device, to the fifth input of the automatic command generation unit and to the input of the delay circuit whose output is connected to the third output of the block tracking, the output of the second arithmetic unit is connected to the swaged input of the first arithmetic unit, the output of which is connected to the second input of the comparison unit 2. The system according to claim 1, characterized in that the automatic command generation unit comprises a control circuit for feeding the roller conveyor three circuits AND, two triggers and an OR circuit, wherein the first input of the control circuit of the feeding roller conveyor is connected to the first input of the first circuit AND, the second input of which connected to the direct output of the first trigger, the inverse output of which is connected to the first input of the second circuit AND, the second input of which is connected five not the fourth output of the block, the output of the second circuit 1/1 is connected to the first input of the OR circuit, the output of which is connected to the first output of the block and the first input of the control circuit of the feed roller, the output of the first circuit AND is connected to the second input of OR, the second input of the control circuit of the feed roller connected to the second input of the block, the fifth input of the block is connected to the S-input of the second trigger, the direct output of which is connected to the first input of the third I circuit, the second input of which is connected to the third input of the block, and the output to the S-input of the first trigger. R FM I