SU1507483A1 - Apparatus for controlling accelerated cooling of rolled stock - Google Patents

Abstract

The invention relates to the automation of rolling production and can be used in control systems for the accelerated cooling of rolled products on the discharge rolls of hot rolling mills for controlling the temperature of the rolling before rolling it into a roll. The purpose of the invention is to improve the quality of rolled metal by increasing the accuracy of controlling the coiling temperature along the length of rolled metal. The invention improves the quality of rolling (P) by increasing the accuracy of temperature control of the coiling of the front and rear parts P. For this, an additional memory block and a control unit are inserted into the device, which allow to eliminate sudden changes in the flow rate of the cooler when the front and rear parts P are cooled. The description of the invention provides a formula for calculating the length of the accelerated cooling zone. 3 il.

Description

The invention relates to the automation of rolling production and can be used in control systems for accelerated cooling of rolled products on discharge rolls of hot rolling mills to regulate the temperature of the rolling before rolling it into a roll.

The purpose of the invention is to improve the quality of rolled products by increasing the accuracy of controlling the coiling temperature along the length of rolled products.

FIG. Fig. 1 shows the scheme of the accelerator control unit) P (by cooling the rolled products; Fig. 2 is a diagram of the control unit; Fig. 3 is a diagram of the distributor.

The rolling cooling control device (Fig. 1) contains gauges 1-4 for the end of rolling temperature, coiling temperature, thickness and speed of rolling, unit 5 of the task, units 6 and 7 for raising to a power, blocks 8-10 for dividing, adders 11-15, 16-20 multiplication units, memory blocks 21-23, distributor 24, cooling unit 25, and control block 26. The input of block 6 is raised to the power and connected to the meter 1 and the first input of the adder 12, the output is connected to the first input of the multiplier block 16. The first input of the block 8 is dividing the connection}: the meter with the thickness gauge 3, the second input-v with the fifth stroke of the block 5 task,

4 00

CP

move - with TpeTiiHM by the input of the multiplier 16 and the second inputs of the blocks 17 and. 18 multiply. The first input of the adder 11 is connected to the first output of the task block 5 and the second input of the awake unit 16, the second input is connected to the second output of the task block 5, the output is connected to the first input of the multiplication unit 17, the input of the raising unit 7 is connected to the third output of the unit 5 set by the second and first inputs of adders 12 and 13, the output to the first and third inputs of blocks 18 and 17 of the death, the second input of the adder 13 is connected to the coil temperature meter 2, the output to the first input of memory block 22. The first input of block 2 is connected to the meter 4 speeds of rolling and the second inputs of multiplication blocks 19 and 20, the second input - to the device Reset input, the first output - to the second input of memory block 22, the second output - to Third inputs of blocks 21 - 23 memory, the third output - with the third input of the memory block 23, the fourth output - with the second input of the memory block 21, fifth outputs - with the control inputs of the distributor 24. The first input of the multiplication unit 19 is connected to the output of the adder 12, output - with the first input of the adder 14, the second and third inputs of which with the outputs of blocks 17 and 16 multiplied; the output with the first input of division 10; the first and second inputs of division 9 are connected to the outputs of multiplication units 20 and memory 23; the output with the second input of adder 15; the first and third inputs of which are connected to the fourth output of the block 5 is set and the output of the multiplier 18, the output is with the second input of the division unit 10, the first input of the memory unit 21 is connected to the output of the division unit 10 and the first input of the memory unit 23, the output is with the information input of the distributor 24, the outputs of which connected to the inputs of the installation of 25 chilled Everyday Control unit 26 (FIG. 2) contains a rental sensor 27, keys 28 and 29, drivers 30-33, elements OR 34 and 35, task block 36, integrator 37, adder 38, comparators 39-43, etc. according to the number of sections of the cooling plant and the corresponding triggers 44-48 with a counting input. The first and second key entries

5 0 5 0 5

0

28 are connected to the direct and inverse outputs of the sensor 27, the third input is connected to the inverse output of the trigger 48, the input of the shaper 31 and the third input of the key 29, the output is connected to the input of the shaper 30 and the second input of the integrator 37. The first input of the OR element 34 is connected to the shaper's output 30, the second input — with the second inputs of the block 26, element 35, and flip-flops 44, 48, 45–47, the output — with the third input of the integrator 37, the first input of which is connected to the first input of the block 26, the output — to the first input of the adder 38, the first and the second inputs of the key 29 are connected to the outputs of the block 36, the output from the sec the input of the adder 38, the inputs of the comparators 39, 40, 41-43 are connected to the output of the adder 38, the outputs to the first inputs of the trigger 44, 48, 45-47, the direct outputs of the trigger 44, 45-47 are the outputs of the block 26, the inputs the drivers 32 and 33 are connected to the direct outputs of the flip-flops 44 and 48, and the outputs are the outputs of block 26, the first input of the OR element 35 is connected to the output of the driver 31, and the output is the output of block 26.

The distributor 24 (Fig. 3) contains comparators 49-51 and elements 52-54 according to the number of sections of the cooling unit. The inputs of the comparators are connected to the information input of the distributor, the outputs to the first inputs of the AND elements, the second inputs of which are connected to the control inputs of the distributor, and the outputs are the outputs of the distributor. The trigger levels of the comparators 49-51 are preset to the corresponding values of 1, 21s, ..., etc., where 1p is the length of one section.

The device works as follows.

The initial length is 1, | 3ones of accelerated cooling, necessary for cooling the rolled stock from temperature T. the end of rolling to a predetermined temperature Tj, j coiling, is determined (as in the prototype) in accordance with the expression

one.,

(T - T W - - t 1 - - t (L-l to Vi K.1 1 ü cwV 1W - T

At h "5

(one)

where v k h

-the speed of movement of rolled metal;

-radiation coefficient;

- rolled thickness)

1, - the length of the air cooling zone before the installation of accelerated cooling j L - the length of the discharge roller table W, - the set speed is accelerated

go cooling.

If after cooling the car with an initial length of 1 ,, the set temperature Tj-vijue is reached, and there is an undercooling or subcooling of the car, this indicates that the intensity is (the accelerated cooling rate does not correspond to the given speed Wv (accelerated cooling. At a given speed W , on the length 1y, the fall in the temperature of the rolled metal should be LTh. The undercooling of the rolled metal does not mean that the decrease in the temperature of the rolled product along the length of the composition

lt DT y - 4 T (., and the accelerated cooling rate

Tvj.- AT cm

W, n

/ V

0

A control unit 2b is reset, which, with a CB pulse, sets up the memory unit 21-23 to the initial state. Thereafter, according to signals CM, KP1, and KP2 of block 26, blocks 21-23 are held in memory mode. The signals UPR1 block 26 valve 24 is closed, the signals UPR2 on it

0, the output is zero, the cooling unit sections 25 are turned off.

When a rental appears on the outgoing roller table according to the signal V of the speed of rolling, the block 26 begins

5 track rental location. According to the temperature T ,, of the end of rolling, the exponential unit 6 forms the signal T. Through the thickness h and the coefficient K, the division unit 8 forms the signal K / h. In multiplication unit 16, a signal is generated (K / h). In matrix 11, a signal L - 1 is formed, in block 7 of the exponentiation, 4

five

T signal

with “h

and in block 17 multiplying jA

product (K / h) T. ,, ,, (L - 1,). AT

The subcooling of the car on LT means that the temperature drop of the car on the length 1 is LT- +

+ day aicMV

and the accelerated velocity is LT-LT LTL,,.

v "

. Consequently, after the discovery.

1 cool

cm

As with undercooling

The scientific research institutes are positive, and when the supercooling L T cm is negative, it is enough to use the expression instead of W to determine the corrected length of the accelerated cooling zone in the formula (1)

The variation of T (T. - - T (- „3 the length of the 1st accelerated cooling zone can be determined by the expression (1) at W V, g or W, W depending on the sign of the deviation W,

 .

5 tasks 1

(2)

set

L, TC, and W. Measuring block

the values of K, j. ,,, the converters 1,2,3 and 4 measure, respectively, the end rolling temperature (TD), the coiling temperature (T), the thickness h and the speed V of rolling.

Before starting the operation of the pulse Reset, for example, from the mill control panel, set

five

0

the difference is determined by a block of 19 multiplication (TkpTC ",) V, and in sum14 - a difference Ttkp-T," e) U

five

0

adder 12

t - t p KP SM5

matore

- (K / b) 1, t; n - (K / h) T, s (b - 1,. Corresponding to the numerator of the expression (1). In multiplication unit 18, the product (K / h) T (.., j , in the adder 15 is the difference W, - (K / h). At the same time, at the output of dividing unit 9, the signal is zero, because the output signal of multiplication unit 20 is equal to zero due to the zero output signal of memory unit 21. Ie. the signal at the output of the adder 15 corresponds to the denominator of expression (1), and at the output of the division unit 10, the required length 1 of the accelerated cooling zone.

The signal KP2 from block 26 of memory block 23 stores the value of 1y at the front of the car. The memory unit 21 after the occurrence of the front part of the rolling stock in the zone for measuring the temperature of the end of rolling by the signal KP1 from block 26 is switched to the input signal tracking mode, therefore

its output is repeated at signal 1.

By

As the car moves along the outgoing roller table, the UPR1 signals of the unit 26 open the distributor 24, and depending on the length 1y, UPR2 signals are generated, including sections of the cooling unit 25. Through the opened sections, the cooler enters the

rolling and cooling ei o. After the occurrence of rolling in the area of the meter 2, the temperature T of the coiling is measured, in the adder 13 the deviation of the LT Tf is determined. - Tr ,. According to the CM signal from block 26, memory block 22 stores the value T. at the front of the car. In multiplication unit 20, the product 4To "V is determined; in division unit 9, the signal () / 1y arrives at the subtracting input of the adder 15. The latter instead of the signal W ,, - (., Forms the signal W ,, - - (К / B) t: .z- .V) / ,.

Thus, after the occurrence of the deviation δT S.1L of the coiling temperature, instead of the value W, W, - (/ / 1., Is used, i.e. the accelerated cooling zone length is corrected: the length 1 of this zone is determined by the same expression (1 ), replacing W, by the expression (2). The signal of the corrected length 1y through the memory block 21 enters the distributor 24, which gives signals for switching on the additional sections Or turning off part of the installation sections 25. Later, when the rear part

The rolling out of the temperature measurement eons is a signal of the speed of moving the rolled metal, therefore the output signal of the integrator corresponds to the path 1 traveled by the front end of the rental from the beginning of the roller table. According to this signaling end of rolling, by the signal KP1 from block 26, block 21 remembers the 9th current value of length 1 and part of the steel continues to cool in accordance with this value

"

As the back of the proc

 35

- V

That of the cooling unit 25 according to the UPR1 signals of the unit 26, the distributor 24 forms commands for shutting down the sections of the cooling unit 25. When the rear end of the rental leaves the discharge roller, block 26 generates a SAT signal, which returns blocks 21–23 of the memory to the initial state.

When the next product appears, the device works in the same way.

The control unit 26 (FIG. 2) operates as follows.

In block 36 set the values corresponding to the lengths "and 1 front and rear uncooled parts of the car. The actuation levels of comparators 39 and 40 correspond to the distance from the start of the outgoing roller table to the measurement areas of the end rolling temperature and the coiling temperature, respectively, and the A1-43 comparators to the 1-N sections of the cooling unit, respectively.

40

45

50

55

 The signal and the length 1 of the front uncooled part of the car coming through the key 29 from task block 36, in the adder 38, a signal 1, 1-1p is formed, corresponding to the current location of the beginning of the cooled part of the car.

As the signal 1 reaches the setting levels of the comparators 39-43, they trigger and set the triggers 44-48 with the counting input to one state. The trigger 44 is triggered when the beginning of the cooled part of the car enters the temperature measurement area of the end of rolling, and a single signal KP1 is output to the output of the control unit 26, which transfers the memory unit 21 (FIG. 1) to the input tracking mode. On the leading edge of this signal, the shaper 32 emits a pulse KP2, at the time of which the memory unit 23 is switched to the input signal tracking mode. Upon completion of the KP2 pulse, the memory unit 23 transfers

At the beginning of the pulse operation, the reset of the integrator 37 through the OR 34 element and the triggers 44-48 is reset. This pulse is also transmitted to the output of block 26 (the SAT signal at the output of the element OR 35).

At the direct outputs of the triggers, the signals are zero, i.e. are zero

output signals UPR 1, KP1, KP2, CM. According to a single signal from the inverse output of the trigger 48, the keys 28 and 29 are in the position when their outputs are closed at the first inputs.

When the front end of the rental appears on the outgoing roller table, the presence sensor 27 installed in the last stand of the mill gives out a single signal at the direct output. This

signal through key 28 enters

driver 30, on the leading edge of the signal driver, generates a short reset pulse, coming through the element OR 34 to the third

integrator input 37. Upon completion of this impulse, the presence signal, which arrives at the second input of the integrator, transfers it to the integration mode. At the first input of the integrator 37

35

40

45

50

55

 The signal and the length 1 of the front uncooled part of the car coming through the key 29 from task block 36, in the adder 38, a signal 1, 1-1p is formed, corresponding to the current location of the beginning of the cooled part of the car.

As the signal 1 reaches the setting levels of the comparators 39-43, they trigger and set the triggers 44-48 with the counting input to one state. The trigger 44 is triggered when the beginning of the cooled part of the car enters the temperature measurement area of the end of rolling, and a single signal KP1 is output to the output of the control unit 26, which transfers the memory unit 21 (FIG. 1) to the input tracking mode. On the leading edge of this signal, the shaper 32 emits a pulse KP2, at the time of which the memory unit 23 is switched to the input signal tracking mode. Upon completion of the KP2 pulse, the memory unit 23 transfers

back to memory mode, saving the signal value of 1y at the front of the car. Single 1-N signals from the flip-flop outputs (UPR1 signals) are output to distributor 24.

When a trigger 48 is triggered, at the moment when the start of the rolled part of the car comes to the coiling temperature measurement zone, the driver 33 generates a pulse CM, for which the memory unit 22 is switched to the input signal tracking mode. Upon completion of the CM pulse, the memory unit 22 switches back to the memory mode, retaining the signal value L T cm at the front of the car. The zero signal from the inverted output of the trigger 48 switches the keys 28 and 29. From the inverted output of the sensor 27, the zero signal through the key 28 goes to the second input of the integrator 37 and puts it into memory mode. Of. block 36 to the adder 38 through the key 29 receives a signal of length X of the rear non-cooled part of the car.

Later, when the rear end of the rolled out of the last stand. The presence sensor 27 returns to the initial state and a single signal appears at its inverse output. On the leading edge of this signal, the former 30 generates a reset pulse, coming through the OR 34 element to the third input of the integrator 37. The integrator output signal takes zero, the output signal of the adder equal to the negative value Ij, the comparators 39-43 return to the initial state, the state of the flip-flops 44-48 does not change. Upon completion of the pulse of the imaging unit 3 (1 by a single signal from the output of the key 28 arriving at the second input of the integrator 37, it enters the integration mode. Its output signal corresponds to the path 1 passed by the rear end of the car from the start of the roller table. In the adder 38 a difference 1 is formed , 1 - Ij, corresponding to the current location of the end of the cooled part of the car. As the signal 1 reaches the setting levels of the comparators 39-43, they trigger and set the triggers, 44-48, with the counting input to the initial state. Output signals 1-N (signals UPR1), the control unit of the block 26 take a zero value. The values of the signals KP2

ten

15

20

five

0

five

0

five

0

five

and the SMs do not change, since the drivers 32 and 33 do not react to the reverse differential of the input signal. A single signal from the inverse output of the flip-flop 48 transfers the keys 28 and 29 to the initial state, and on the leading edge of this signal, the shaper 31 generates a reset pulse, coming through the OR element 35 to the output of block 26 (signal SB). When the next product appears, block 26 works in the same way.

The distributor 24 operates as follows (Fig. 3)

When a signal appears at the information input of the distributor 24 corresponding to the calculated length of the accelerated cooling zone, the comparators 49-51 are triggered. Single signals from the outputs of the activated comparators go to the first inputs of elements 52-54 of the elements I. When the beginning of the cooled part of the car appears below the cooling installation section, the input signals 1-N (control signals 1), the distributor 24 take on single values. By the coincidence of the units at the inputs of elements 52-54, these elements trigger and form single output signals 1,2 ... (UPR2 signals) of the distributor 24. As the rear part of the car leaves, the input signals and, therefore, the output signals of the distributor 24 take a zero value.

Thus, by introducing an additional storage unit, a control unit, and corresponding connections, the device improves the control accuracy of the coiling temperature by reducing the flow control errors of the cooler when cooling the front and rear parts of the car and thereby improving the quality of the car. In the claimed object, the correction function is performed by blocks 22 and 23 of memory and blocks of multiplication 20 and division 9, together with adder 15 and other elements of the device, simultaneously performing the main function of determining the initial length of the accelerated cooling zone. Thus, there is no need for a separate correction block.

Claims (1)

Invention Formula An accelerated rolling cooling control unit comprising a sectioned cooling unit, rolling end temperature meters. and coiling, rolling thickness and speed, task block, two erection blocks, D degree, three division blocks, five adders, five multiplication blocks, two memory blocks and a distributor, the input of the first degree block is connected to the rolling end temperature meter and the first the input of the second adder, the output to the first input of the first multiplication unit, the first input of the first division block is connected to the rental thickness meter, the first input of the first adder is connected to the first output of the reference block and the second input of the first multiplication unit, the second the input is with the second output of the task block, the output is with the first)) progress of the second multiplication unit, the input of the second raising unit is connected to the third output of the task block, the second input of the second adder and the first input of the third adder, the output to the first input of the third the multiplication unit, the second input of the third adder is connected to the coil temperature meter, the third input of the first multiplication unit is connected to the second input of the third multiplication unit, the first input of the fourth multiplication unit is connected to the output of the second adder, the second input with the speed meter, the output with the first input of the fourth adder, the second input of which is connected to the output of the second multiplication unit, the output with the first input of the third dividing unit, the first input of the fifth adder is connected to the fourth output of the task unit, the second input with the output. the second dividing unit, the output with the second input of the third dividing unit. the output of which is connected to the first input of the first memory block, characterized in that, in order to improve the quality of rolling by increasing the accuracy of controlling the winding temperature along the rolling length, it is equipped with a third memory block and a control unit, the second input of the second multiplication unit is connected to the second input The third multiplier and the output of the first division block, the third input - with the output of the second exponentiation block, the second input the first dividing unit is connected to the th output of the task unit, the first input of the control unit is connected to the speed meter, the second input to the device reset input, the first the output is with the second input of the second memory block, the second output is with the third inputs of the first, second and third memory blocks, the third output is with the second input of the third memory block, the fourth output - with the second input of the first memory block, the fifth outputs - with the control inputs of the distributor, the first input of the second memory block is connected to the output of the third adder, the output is the first input of the fifth multiplier unit, the second input of which is connected to the speed meter, the output is connected to the first input of the second division unit, the first input of the third memory block is connected to the output of the third division block, the output is connected to the second input of the second division block, third the inputs of the fourth and fifth adders are connected respectively with the outputs of the first and the third multiplication unit, the information input of the distributor is connected to the output of the first memory block, the outputs to the inputs of the cooling unit. figure 1 3 " /. Jtfpj li-j-rpoBa (Pt /, J Compiled by J. Peredarni Tehred I. Khodanych Proofreader O. Tsiple . /, about. eleven /, Circulation 459 ;: v; apcTEe4Horo of the Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 13035, Moscow, Zh-35, 4/5, Raushsk nab. 32 Hfti vnpi i-) / 7 - ,, I1 CAf - tlfrh U j / - r J6 til Subscription