SU1479812A1 - System for controlling workpieces heating in ring heating furnace - Google Patents

Abstract

The invention relates to furnace heat technology and is intended primarily for use in temperature control systems for heating metal in multi-zone pass-through heating furnaces. The purpose of the invention is to increase the productivity of the furnace, reducing the specific fuel consumption, metal burn and scrap. The goal is achieved by the fact that the system additionally contains a loading sensor 5, an unloading sensor 9, a thickness sensor 10 of the workpieces, a mass sensor 7 and a stacking pitch sensor 8 on the bottom of the workpieces, a data entry unit 6, a workpiece advance speed sensor 14, a zone length setting unit 15 furnaces, productivity units 12 in zones, the outputs of load sensors, unloading, thickness, weight, laying step on the bottom of the blanks and data entry unit 6 are connected to the inputs of the block 11 for determining the location of the blanks in the furnace, which is connected to the first output The first inputs of the performance units 12, and the second output to the first inputs of the computing devices 13, the outputs of which are connected to the first inputs of the controllers 3 of the respective zones, the outputs of the sensor 14, the speed of advancement of the blanks in the furnace and the setting device 15, the lengths of the furnace zones are respectively connected to the second and third inputs performance units 12, the outputs of which are connected to the second inputs of computing devices 13. Additionally, a block 16 for determining the mutual influence of heating zones is entered, the first and second inputs of which are connected respectively tween the outputs of blocks 12 and the performance of computing devices 13 of two adjacent zones of the furnace, the first output of which is connected to an input of regulator 3 from those two heating zones, which is disposed closer to the window of the furnace load. 1 hp f-ly, 5 ill.

Description

one

The invention relates to the field of furnace heat engineering and is intended primarily for use in temperature control systems for heating metal in multi-zone pass-through heating furnaces.

The purpose of the invention is to increase the productivity of the furnace, reducing the specific fuel consumption, metal burn and scrap.

FIG. 1 is a block diagram of a system for controlling the heating of blanks in an annular heating furnace; in fig. 2 is a block diagram of a unit for determining the location of the blanks in the furnace; in fig. 3 is a block diagram of a unit for determining the performance in the zone; Fig 4 is a block diagram of a computing device; Fig. 5 is a block diagram of a block for determining the mutual heating zones o

The heating control system for billets in an annular heating furnace (Fig. 1) contains an annular heating furnace 1 with any number of heating zones, temperature sensors 2 in zones, controllers 3, regulators 4, workpiece loading sensor 5, data input unit 6 (modal. constants), sensor 7 for mass of blanks, sensor 8 for laying steps on the bottom of the blanks, sensor 9 for unloading blanks, sensor 10 for blanks thickness, block 11 for determining the location of blanks in a furnace, block 12 for determining productivity in zones, calculated 0

five

0

five

0

five

tel devices 13, a sensor 14 for moving the workpieces in the furnace, a setting device 15, lengths of heating zones and determination blocks 16, the mutual influence of heating zones, and the outputs of temperature sensors 2 in the zones are connected to the first inputs of the regulators 3, whose outputs are connected with regulating by the organs 4, the outputs of the sensor 5, the block 6 and the sensors 7-10 are connected to the inputs of the block 11 for determining the location of the workpieces in the furnace, which by its outputs is connected respectively to the inputs of the block 12 for determining the performance in zones and computing devices 13, the outputs of the sensor 14 of the advancement rate of the blanks in the furnace and the setting unit 15 of the heating zone lengths are connected to the inputs of the performance determining units 12 in the zones whose outputs are connected to the corresponding inputs of the computing devices 13 and the heating influence zones 16. The outputs of the computing devices 13 are connected to the corresponding inputs of the blocks 16 for determining the mutual influence of the heating zones and the second inputs of the regulators 3.

The block for determining the location of workpieces in the furnace (Fig. 2) has a memory element 17, an OR element 18, an AND element 19, a pulse generator 20 for issuing time pulses, a counter 21 for copying information from previous registers into subsequent registers of registers , block 22 of registers (the number of registers corresponds to the maximum number of heaps placed in the furnace), in which information is recorded on the charge parameters for each billet, block 23 of keys, which serves to transmit information contained in registers of registers blocks, block 24 elements OR, comparison block 25 (compares the center-to-center distance code between blanks from registers of registers block 22 with a zero code, and if a signal appears at the output of the comparator block, this means that it is necessary to rewrite the information from the previous register), element AND 26, block 27 elements AND, block 28 elements OR, block 29 delay elements, element OR 30, trigger 31, delay element 32, element AND 33, delay element 34, element OR 35, counter 36 intended for counting zone zones (from zone j to first), memory element 37, element 38 and counter 39 intended for census of information from / previous to the next registers of register block 22 when billets are taken out of the furnace, the first input of memory element 17 connected with the output of the workpiece loading sensor 5, and the second with the output of trigger 31, the output of memory element 17 is connected to the corresponding inputs of the element OR 18 and the element AND 26, the second inputs of which are connected to the outputs of the trigger 31 and the comparison unit 25, the input which is connected to the output of the block 24 elements OR, the second in The output of which is connected with the input of the key block 51, and the input with the output of the 23 key block The output of the AND element 26 is connected to the input of the block 27 of the AND elements, the outputs of which are connected to the corresponding inputs of the block 28 of the OR elements, the outputs of the latter are connected to the corresponding inputs of the block 22 of registers and a delay element block 29, the outputs of which are connected to the corresponding inputs of the register block 22. One input of the element OR 30 is connected to one of the outputs of the counter 39, and the second input is connected to the inputs of the block 27 of the elements AND, the block 23 of the keys and the element And 33, the output of the element OR 30 is connected to one of the inputs of the trigger 31, the second input of which is connected to the output And 33, one input of which is connected to the output of delay element 32, and the second to the input of element OR 30, the output of counter 21, the inputs of block OR of elements 27 and key block 23, the second inputs of which are connected to the corresponding outputs of block 22 of registers. The input of the delay element 32 is connected to the output of the trigger 31, the input of the delay element 34 to the output of the trigger 31, and the output to one of the inputs of the OR element 35, the second input of which is connected to the output of the delay element 50, and the output to the input of the counter 36, the output of which is connected to the input of the key block 40, the second input of which is connected to the output of the block 24 elements OR the output of the element OR 18 is connected to the input of the element AND 19, to the second input of which the output of the pulse generator 20 is fed, and the output to the input of the counter 21. The output generator 20 pulses are also connected to one of the input AND gate 38, whose second input is connected to the output member 37 a memory, and an output - to the input of counter 39. One of the outputs of the latter is coupled to an input of the OR gate 30 and memory element 37, and the second - to corresponding inputs of OR 28 elements. The second input of the memory element 37 receives a signal from the unloading sensor 9. One of the outputs of the block 27 of the elements I is connected to the corresponding input of the block 22 of registers, one of the inputs of which is connected to the outputs of the block 6 and the sensors 7, 8 and 10.

The unit for determining the performance in the zone (Fig. 3) contains a block 40 of keys, an adder 41 for combining codes corresponding to the center-to-center distance between blanks, an adder 42 for summing codes corresponding to the mass of the blanks, a comparator 43 for comparing the code from the output of the adder 42 with the zone length code, the adder 44, designed to determine the difference between the codes of the adder 42 and the zone length adjuster 15, the key block 45, the multiplication block 46, the multiplication block 47, the divider 48, the key block 49, and ement delay 50, and two input key unit 40 connected

respectively, with the outputs, the block 24 of the OR elements and the counter 36, and the output with the inputs of the adders 41 and 42, the output of the adder 41 is connected to the inputs of the comparison unit 43, the adder 44 and one of the inputs of the key block 45. The second input of the adder 41 is connected to the inputs of the adder 42 and the element OR 35 and the output of the delay element 50, and the output of the adder 42 - with the corresponding input of the key block 45, the output of which is connected to the input of the multiplication unit 46, and the output of the latter to one of the inputs 47, to the second input of which is fed the output of the sensor 14 of the advancement rate of the blanks in the furnace, and the output is connected to one of the inputs of the divider 48, the output of which is connected to the inputs of the computing device 13 and the block 16 for determining the mutual influence of the heating zones, and the output is set to chica 15 heating zone lengths - with inputs of comparator unit 43, adder 44 and divider 48. Inputs of computing device 13, key unit 45, delay element 50, adder 44 and key block 49 are connected to the output of comparator unit 43. The output of the block 49 keys connected to the input of the adder 41.

The computing device (FIG. 4) contains a key block 51, a memory register 52, a memory 53, multiplication blocks 54-56, an adder 57, an adder 58., a multiplication unit 59 and an adder 60, one of the inputs of the key block 51 is connected to the output is a block of 24 OR elements, the second is connected to the output of the comparison block 43, and its output is connected to the memory input 53. The inputs of the register 52 are connected to the outputs of the comparison block 43 and the divider 48, and its outputs are connected to the inputs of the multiplication blocks 54 and 55. The outputs of the memory 53 are connected to the inputs of blocks 55, 56, 59, 62, 65, 68 and 69 of multiplication and adders 58, 60 and 67. The output of the adder 58 is connected to the input of the multiplication unit 59, the output of which is connected to the corresponding input of the adder 60, the third input of which is connected to the output of the adder 57, the two inputs of which are connected to the outputs of blocks 55 and 56 multiplication. The output of the adder 60 is connected to the input of the regulator 3, and the output of the multiplication unit 54 to the inputs of the multiplication unit 56 and the adder 64 The interlock between heating zones

. (Fig. 5) form adder 61, multiplication unit 62, adders 63 and 64, multiplication unit 65, adders 66 and 67, and multiplication units 68 and 69, the inputs of adder 61 connected to the outputs of divider 48, and its output - to one input of multiplication unit 62, the second input of which is connected to one of the outputs of the memory 53, and the output to one of the inputs of the adder 63, the second input of which is connected to the output of multiplication unit 65. The output of the adder 63 is connected to one of the inputs of the adder 66, to the second input of which the output of the multiplication unit 68 is connected, and its output is connected to one of the inputs of the multiplication unit 69. The second input of multiplication unit 69 is connected to one of the outputs of memory 53, and its

5 is output to controller 3. The inputs of adder 64 are connected to the outputs of multiplication unit 54, and its output to one of the inputs of multiplication unit 65, the second input of which is connected to one

0 from the outputs of the storage device 53. The outputs of the storage device 53 are connected to the inputs of the adder 67- and the multiplier 68, and the output of the adder 67 is connected to the input of the block 68

by multiplying by

The system works as follows

The temperature in each zone of the furnace 1 is measured by sensors 2 (radiation

0 pyrometers, sighted at the bottom of the carbofrax glass) and maintained at a predetermined level by regulators 3, affecting fuel consumption with the help of regulators 4.

e Loading and unloading of the workpieces are recorded, respectively, by loading sensors 5 and unloading 9. The signals from sensors 5 and 9 are fed to the first and second inputs of the block 11 for determining the location of the workpieces in the furnace, the third, fourth and fifth inputs of the block 11 receive information about the thickness, weight and the laying step on the bottom of the workpiece, respectively, from

5 sensors 10, 7 and 8. From the output of data input unit 6, information is given on the coefficients of the polynomial, the reference thicknesses of the workpieces, etc. on the sixth input of block 11 definition

0

the locations of the blanks in the furnace, from which the block 12 for determining the productivity of the furnace zones receives signals characterizing the mass of the blanks and the center-to-center distance between the blanks located in the corresponding zone of the furnace. The second and third inputs of the block 12 receive signals from the output of the sensor 14, the rate of advance of the blanks in the furnace and the sensor 15 of the length of the heating zones. In block 12, the current capacity of the respective heating zones is calculated according to the expression:

I: "., (Oh

J

) 5-1

5j 5J

Where

H

f p% performance in the zone J, t / h;

the rate of advancement of the blanks in the furnace, pcs / h; zone length j. m; the number of blanks in the zone, pcs;

weight of one blank, t; the center-to-center distance between the workpieces, m. From the output of the block 12, the computers 13 receive signals corresponding to the current performance of the heating zones. The other inputs of the computing devices 13 receive information on the parameters of the set of blanks located in the corresponding zone of the furnace from the output of the block 11 for determining the location of the blanks in the furnace.

In computing devices 13, temperature values are calculated in the respective zones according to the expression:

aoj-K ((d0 -ate) + 21a.P, (2)

v temperature at the place of installation of the glass of the radiation pyrometer;

P.,

-coefficient polynomial for calculating the temperature in zone j;

- coefficient of proportionality (it is selected experimentally for a specific furnace when setting up the system. In a first approximation, K,

 ABOUT;

-the current value of the thickness of the workpiece;

10 - the reference value of the thickness of the workpiece;

 - j-th performance. Found 13 device values

0

0

five

temperature in zone t

F.J

served

as a task for the relevant regulators 3 and further to the regulatory authorities 4 „

To compensate for the mutual thermal effect of the heating zones, additional blocks 16 for determining the mutual influence of the heating zones are introduced in the proposed system, and the signals from the blocks 12 and computing devices 13 of two adjacent zones are supplied to the inputs.

In block 16 for determining the mutual heating zones, the degree of mutual interference is estimated by the difference between the temperatures of the jth zone applied to the control and calculated for the performance of the previous one in the direction of movement of the metal in the heating zone P.:.

At

pn (j-0 Kt (dTevc.j- d-reK {j-0

(3)

+. .

As a result, controller 3 senses a signal corresponding to the following temperature value:

five

 PM n

J

oj- - P1 - K At,

Wj

(four)

Where

KI0

five

)

the proportionality coefficient, which determines the degree of influence of the j-th zone on (j-D-th (selected experimentally for a particular furnace when setting up the system. In a first approximation, K 1). The block 11 for determining the location of the blanks in the furnace works as follows

The billet loading into the furnace is detected by the sensor 5. A signal about the billet loading into the furnace goes to the first input of the memory element 17, from the output of which it is fed to the first inputs of the elements OR 18 and AND 26. The signal of the element OR 18 goes to the first input of the element AND 19 the second input of which is fed a signal from the pulse generator 20. From the output of the element And 19 come from ignaly ka input counter

0

21. By means of the counter 21, the codes from the registers of the register block 22 are connected to the corresponding keys of the key block 23 (the connection is made alternately from the n-th register in the first). By means of a block of 23 keys, codes corresponding to the thermophysical and geometrical parameters of the blanks are fed (from the nth register of the first, depending on the state of the counter 21) to the input of the block 24 of OR elements. From the first output of block 24, the corresponding code is compared with the zero code of the comparison block 25. If a signal appears at the output of the comparison block 25, it means that the information from the previous register must be rewritten in the polled register of the register block 22. When equating in block 25, the signal from its output goes to the second input of element 26. The signal from the output of element 26 goes to the second inputs of the elements of block 27 elements I, and the signal from the output of counter 21 arrives at the first inputs of the latter. Depending on the selected register (the registers are polled sequentially from the first to the first, where ls | 0) the corresponding element of the block 27 of elements AND triggers, the output of which receives a signal through the corresponding element of the block of 28 elements OR to rewrite the information from the previous register into the poll st register unit 22 registers, i.e., information is copied from (p-1) -th register to n-th, from (p-2) -th to (p-1) -th, etc., from the first to the second. Simultaneously, from the outputs of elements of the block 28 elements OR, signals are sent to the corresponding elements of the block 29 delay elements, the output of which receives signals to reset the information in (n-1) y, (n-2) -th, etc. first register block 22 registers. Information about the parameters of the load of loaded blanks is copied from sensors 7, 8 and 10 and block 6 into the first register of register block 22 when the n-th signal from counter 21 arrives at the n-th element of the AND block 27, the output of which receives the census signal for the first register block 22 registers. At the same time, information about the regime data is rewritten in the first register of the register block 22: parameters of the blank loaded into the furnace from block 6

data entry and sensors 7. 8 and 10. At the same time, the output of the counter 21 sends a signal to the first inputs of the OR 30 and AND 33 elements. The OR 30 element triggers a trigger 31, from which the signal goes to the second input (reset) of the memory element 17 . Simultaneously, the output of the trigger 31 receives a signal at the input of the delay element 32, and from the output of the latter, the second input of the And element 33. The response time of the delay element 32 is longer than the time between two pulses of the pulse generator 20. Simultaneously, the output of the trigger 31 receives a signal through the second input of the element OR 18 to the first input of the element AND 1.9. The second input of the latter receives a signal from the generator 20 pulses. Similarly, an element 19 transmits pulses to the input of the counter 21. Through the counter 21, codes corresponding to the thermophysical and geometrical parameters of the blanks are connected, from the registers of the register block 22 through the keys of the key block 23 to the input of the block 24 of OR elements. From the first output of the block, 24 codes corresponding to 15: and Ps arrive at the inputs of blocks 12, and from the second output (-) codes corresponding to (K ,,

K2 aoj am do atek. At the same time, the output of the trigger 31 receives a signal at the input of the delay element 34 (the delay element triggers the appearance of the signal at the input, and the output signal disappears after a certain time interval despite the fact that the signal at the input is present from the output The last signal through the OR element 35 is fed to the input of the counter 36. The counting volume of the pulses of the counter 36 corresponds to the number of heating zones (the zone number code is assigned from j-ro to the first). The outputs of the counter 36 are connected to the inputs of block 12, t. that is, the first output of the counter 36 is connected to the input of the jth unit 12, the second output of the counter (-) to the input (j-1) and TOD, the nth output of the counter to the first input.

Thus, through the counter 21 all registers of the register block 22 are connected via the keys of the key block 23 to the block 24.

When a signal appears at the nth output of counter 21, the element is triggered.

And 33, the signal from its output goes to the reset input of the trigger 31, which is de-energized,

When the sensor 9 is unloaded, the signal from the sensor arrives at the first input of the memory element 37. From the output of the latter, a signal arrives at the first input of the element I 38, the second input of which receives a signal from the generator of 20 pulses. From the output of the element 38, a signal is sent to the input of the counter 39. From the output of the latter, a signal is sent to the corresponding elements of the block 28 of the elements OR to rewrite information from the previous registers of the block 22 of the registers to the subsequent ones, i.e. information is copied from the (n-1) -th register to the n-th, etc., from the second register (-) to the third (except the first) o

Simultaneously, the outputs of the elements of the block 28 of the elements OR receive signals to the corresponding elements of the block 29 of the delay elements, and from the outputs of these elements, signals are sent to zero the contents of the (n-1) -th, (n-2) -th and Todd second registers When a signal appears at the nth output of the counter 39, the element OR 30 is triggered, the signal from its output goes to the input of the trigger 31. Simultaneously from the nth output of the counter 39, a signal is received to reset the element 37

MINT

Similarly, the above signal from the output of the trigger 31 enters through the element OR 18 at the input of the element AND 19 and the other input of the element And 19 receives pulses from the generator of 20 pulses. The pulses from the output of the element And 19 are fed to the input of the counter 21. Through the counter 21, codes are connected that correspond to the thermophysical-45 t input of the adder 41 of the block 12

kim and geometrical parameters of the blanks (from the n-th register of the first), from the registers of block 22 through blocks of 23 keys to the outputs of the block of 24 OR elements.

The unit 12 for determining the performance in the zones operates as follows (described for one zone, for the other zones in the same way).

When a signal is received from the first output of the counter 36, the performance of the j-th zone is considered.

The signal from the first output of the counter 36 is fed to the first input of the block

40 keys, on the second entrance of which

 and

g C pmhoda

first block 40

-and PS: do the first inputs of adders

5. | |

and

41 and 42 (codes corresponding to 1 P5} come from the outputs of the n-th to the first register of block 22 through the keys of blocks 23 and 24 with a discreteness of the generator of 20 pulses and depending on the state of the counter 21), From the output

adder 41 code corresponding to

the amount of 216, arrives on the first j

input unit 43 comparison. A code corresponding to the length of the j-th zone (L:) is fed to the second input of the latter from the unit 15, the length of the heating zones. If

in block 43, the comparison is performed by

love

L

then on his way out

"V a signal appears that fixes that in zone j there are n blanks placed with a total value of the center-to-center distance between the blanks equal to or greater than the length of the jth heating zone. WITH ; output of the comparison unit 43 receives the summation resolution signal to the first input of the summation unit 44 "The second input of the summation unit 44 receives the code from the output of the adder 41, and the third input - from the output of the 15" I

In block 44, the summation is calculated

(

P

H & M-CHO at the same time, from the output of the comparison block 43, a signal is sent to the first input of the key block 43. Through the key block 49, a code corresponding to the value of L- is fed to

The third input of the adder 41 block 12

performance (j-1) -u zone.

At the same time, from the output of the comparison unit 43, a signal arrives at the first input of the key block 45. In this case, the key block Q 45 is triggered and connects the outputs of the adders 41 and 42 to the input of the multiplication unit 46. Since the release of the last code corresponding to the expression h

21. P;, arrives at the first input 5 s i bj 5J

block 47 multiply, at the second input

the latter receives the code corresponding to the rate of advancement of the blanks in the furnace, from the output of the sensor 14 "

131479812

From the output of block 47 multiplying code,

VI

corresponding to f .1,

5-1 J J

arrives at the first input of block 48 division. At the second input of the latter receives the code L; from the output of setpoint 15, which corresponds to the length of the jth heating zone.

Thus, in block 12 for determining the performance in zones, the current capacity of the jth zone is calculated according to expression (1).

Simultaneously, from the output of the comparison unit 43, a signal is fed to the input of the delay element 50, and from the last output (-) to the second input of the OR element 35 and to the reset inputs of the adders 41 and 42o From the output of the OR 35 element, a signal is fed to the input of the counter 36, The counter 36 is triggered, and the signal from the second output enters the unit 12 for determining the performance of the (j-1) -ft zone.

The current productivity of the (j -1) zone is calculated in the same way. The only difference is that, at the initial moment, the third input, sum 14

signals corresponding to P- and P are fed from the outputs of memory register 52 and multiplication block 54. Signals from the first and second output of the storage device 53, corresponding to a, j and are received at the second inputs of the multiplication units 55 and 56. Coefficients

polynomial a0, a4,

a2 are calculated

Yu by the least squares method

From the outputs of blocks 55 and 56 multiply the signals corresponding to a, j P; and a {P2, arrive at the input of the adder 57.

15 From the third and fourth outputs of the storage device 53 to the adder 58 receives signals corresponding to the signals

with

2Q outputs of the adder 58 are fed to the Ix of the multiplication unit 59. The second input of the multiplication unit receives a signal corresponding to the coefficient Kf, from the fifth output of the memory device 53 ° C, the output of the multiplication unit 59, the signal corresponding to the product Ki (d0-dTeK-) is fed to the input of the adder 60. The second input

corresponding do and cCE (:, corresponding to the sum (d0-dT),

adder 60 receives a signal corresponding to 2

 J j

Matora 41 receives the code L. from the output 30 of the corresponding amount 21a .; P.1, from the output of the block 49 of the keys of the block 12 to determine the performance of the j-th zone. Thus, in performance block 12 (j-O-th zone performance is calculated by the expression;

i- .H.

the adder 57, and the third input of the adder 60 receives a signal corresponding to the coefficient of the polynomial a, from the sixth output of the storage device 53.

Thus, the value calculated in the computing device 13

temperature t

812

14

signals corresponding to P- and P are fed from the outputs of memory register 52 and multiplication block 54. Signals from the first and second outputs of the memory 53, corresponding to a, j and are received at the second inputs of the multiplication units 55 and 56. Coefficients

polynomial a0, a4,

a2 are calculated

least squares method

From the outputs of blocks 55 and 56 multiply the signals corresponding to a, j P; and a {P2, arrive at the input of the adder 57.

5 From the third and fourth outputs of the storage device 53 to the adder 58 receives signals, respectively,

with

Q output of the adder 58 is fed to the input of block 59 multiplication. The second input of the multiplication unit receives a signal corresponding to the coefficient Kf, from the fifth output of the memory device 53 ° C, the output of the multiplication unit 59, the signal corresponding to the product Ki (d0-dTeK-) is fed to the input of the summer 60. The second input

corresponding do and cCE (:, corresponding to the sum (d0-dT),

adder 60 receives a signal corresponding to 2

the corresponding amount is 21a .; R.1, from the exit

 J j

the corresponding amount is 21a .; R.1, from the exit

the adder 57, and the third input of the adder 60 receives a signal corresponding to the coefficient of the polynomial a, from the sixth output of the storage device 53.

Thus, the value calculated in the computing device 13

temperature t

pnj

in the zone is served

Similarly, the performance of the subsequent heating zones is determined.

The computing device 13 operates as follows.

After calculating the performance in the j-th zone, the comparison unit 43 (Fig. 3) receives a signal at the first inputs of the key block 51 and the memory register 52. By block 51 keys

from the output of block 24 to the memory device P- and P-. From the exit

Array 53 receives information corresponding to K ,, K2, a0j, a; j, d0 j dye. The memory register 52 records the performance of the jth zone from block 48. The first and second inputs of multiplication unit 54 receive signals corresponding to the performance of the jth zone. The first inputs of block 55 and 56 multiply post55.

the last signal corresponding to the sum (P. -P;.,) is fed to the input of the multiplication unit 62, and the second input of the multiplying unit receives the signal Uj-O from the first output of the area memory 53 (j-1). The signal corresponding to a, (;,} from the output of block 62 multiplication is fed to the first input of the adder 63.

as a task for regulator 3 „

The block 16 for determining the mutual heating zones for the two adjacent zones jth and (j-1) -u works as follows (for the remaining neighboring zones

the unit works similarly).

From the outputs of the blocks 48 of two adjacent heating zones, the signals corresponding to the performance P- and P- come to the input of the adder 61. From the exit

the last signal corresponding to the sum (P. -P;.,) is fed to the input of the multiplication unit 62, and the second input of the multiplying unit receives the signal Uj-O from the first output of the area memory 53 (j-1). The signal corresponding to a, (;,}) from the output of block 62 multiplication is fed to the first input of the adder 63.

151

From the outputs of the multipliers 54 of the two adjacent zones, the signals corresponding to P and P enter the input of the adder 64. The signal corresponding to the sum (P + RD {) from the last output goes to the input of multiplication unit 65 and the second input of the multiplication unit receives signal a, from the second output of the storage device 53 zone (j-1). The signal corresponding to

a2 (j-i) (pf p j-,) from the output of the multiplication unit is fed to the second input of the adder 63. From the output of the adder 63

2

signal corresponding to 21a1 (

.

(P2-P2-,), is fed to the input of the adder 66.

The signals corresponding to dTeK: and dTew (from the output of the memory devices 53 of the two adjacent zones are fed to the input of the adder 67. From the output of the latter, the signal corresponding to the sum of drek is d-reK (j.1), to the input of the multiplier 68, and to the second the input of the multiplication unit receives a signal corresponding to K ,, from the fifth output of the memory device 53 of the zone (j-1). The signal corresponding to (j-) is fed to the second input of the adder 66 "From the output of the adder 66 the code corresponding to the expression (3) , is fed to the input of the multiplication unit 69, and to the second input of the multiplication unit is received the signal corresponding to K2 from the seventh output of the memory 53 of the zone (j-1) 0 From the output of block 69, the signal corresponding to p „(j,) enters the input of the controller 3 (j-i) -ft zones.

Claims (2)

The use of the proposed control systems for heating billets in an annular heating furnace provides, in comparison with known systems, an increase in furnace productivity by reducing the specific heating time of the metal, as well as reducing the specific fuel consumption, carbon monoxide and scale, and heat rejects. Invention Formula 1, The heating control system of the blanks in the annular heating five 0 five 98 0 50 50 0 1216 furnaces equipped with mechanisms for loading and delivery of blanks, burner devices containing temperature controllers according to the number of heated furnace zones, whose inputs are connected to the outputs of the corresponding temperature sensors of computing devices, in order to increase the furnace productivity, to reduce the specific consumption fuel of metal burn and scrap, it is equipped with sensors for loading, unloading, thickness, weight and step of laying on the bottom of the workpieces, a data input unit, a sensor for the speed of advancement of the workpieces furnace, setting the length of the furnace zones, units for determining the performance in zones, the unit for determining the location of the workpieces in the furnace, and the outputs of the load sensors, unloading, thickness, weight, laying step on the bottom of the workpieces and the data input unit are connected to furnace, which is connected with the first output to the first inputs of the capacity blocks, and the second output to the first inputs of the computing devices, the outputs of which are connected to the first inputs of the regulators of the corresponding zones, output advancing speed sensor rows of blanks in the furnace and the furnace zone length setter connected respectively to the second and third blocks performance inputs, whose outputs are connected to second inputs of the computing devices. 2. The system according to claim 1, characterized in that, in order to improve the heating quality of the blanks, it is equipped with a block for determining the mutual influence of the heating zones, the first and second inputs of this block being connected respectively to the outputs of the performance blocks and computing devices of two adjacent SQHs furnaces, the output of the first of which is connected to the input of the regulator of that of the two heating zones, which is located in the furnace closer to the loading window. 2186m Fiel