SU900904A1 - System for controlling rate of delivering billets from heating furnaces - Google Patents

Description

The invention relates to metallurgy, in particular, to rolling production and can be used in the synthesis of control systems for the rate of delivery of billets from heating furnaces of rolling and tube rolling mills. A device is known for controlling the delivery of blanks from furnaces of a pipe mill, containing time interval sensors, a device for discharging blanks from a furnace, a billet temperature control sensor, a pulse frequency difference meter, a unit for distributing hypotheses, metal passage sensors through control sections, an amplitude analyzer, a time interval discriminator, adders, block of commands, probabilistic distributor 1. The disadvantages of this device include its design. the complexity and the need to accumulate information on the number of blanks of a significantly larger number of pieces in most rolled batches, which makes it inapplicable for the batch with MaittJM the number of blanks that are often found in the practice of pipe production. A system is also known to control the rate of dispensing billet furnaces containing process sensors. tracking the passage of the workpieces, the unit for setting the standard time, the generator of pulses for the standard rolling rate, the sensor of the average cycle time and the control unit for issuing the blanks 2. The system is based on generating control signals according to the manual standard rolling rate determined by the operator based on the bottleneck in technological line rolling. 8 real conditions under the influence of many random factors, varies as the performance of a narrow

location and its location in the rolling line. The absence of an operative correction of the rolling rate leads both to a simple mill and to the staying of the heated metal, which leads to a decrease in the productivity of the rolling equipment and to a violation of the rolling process regulations.

Closest to the offer is a system for controlling the rate of delivery of billets from furnaces. This system contains sensors for tracking the passage of rolling stock (billets) through control sections in the rolling line, pulse counter, generator of driving pulses, standard time interval setting device, control block for issuing billets, controlled generator of driving pulses, reversing shift register, k the first input of which is connected to the sensors of the passage of the workpieces in two sections located at the beginning of the technological line during rolling. Proximity passage sensors in the third section, located at the end of the process line during rolling, and the output of the controlled compensation pulse generator f 3 J are connected to the second input of the reverse shift register. The adaptation properties inherent in it result in significant the time lag between its steady state and often changing under the influence of random perturbations of the productivity of the entire rolling mill. Exceeding the time constant of the system adaptation over the corresponding parameters of the stochastic processes of changing the productivity of the rolling mill eliminates the possibility of optimizing the system for performance and limits the technical and economic performance of rolling. The purpose of the invention is to improve the technical and economic indicators of pipe rolling. This goal is achieved by the fact that the system for controlling the rate of delivery of billets from furnaces, which contains the sensors for tracking the passage of billets (rentals) through the control sections in the rolling production line, is a differential pulse counter.

a generator of driving pulses, a control unit for discharging billets from furnaces (an actuating unit) and an n-bit reversing shift register,

additionally contains the second n-bit pulse counter, n + 2 logic elements AND, element OR, two generators of randomly distributed pulses in time, module, differentiator, unit of the standard number of pieces in the control section of the rolling line between two control sections , and the reference element,

the first input of which is connected to the output of the differential meter, the second input - to the output of the setpoint adjuster of the standard hire rate, and its output to the input of the module, the output of the last

Claims (2)

the time of the driving pulses and the input of the differentiator is connected to the first input of the generator, the output of the last is connected to the first input of the (n + 1) -th logical element I, the output of which is connected to the first input of the n-bit reversing shift register, the output of each bit of the last is connected with the first input of the logic element of the same name, And, the second input of each of the 1-p logic elements of AND is connected to the output of the same-name bit of the n-bit pulse counter, the summing input of the last is connected to the output of the generator; x pulses, the outputs of all 1 - n elements And through the logical element OR are connected to the input of the actuating unit and the resetting input of the n-bit pulse counter, the output of the rental sensor installed in the first rolling section of the reference section, is connected to the counting input of the differential pulse counter , the output of the second sensor for passing the workpieces through the control section is connected to the second input of the latter, the first input of the (n + 2) -th logic element AND, the output of the last connecting It is connected to the second input of the reversible n-bit shift register, and the outputs of the first and second generators of pulses randomly distributed in time are connected to the second inputs of the (n + 1) -th and (n + 2) -th logic elements, respectively. block diagram of the proposed system. The system for controlling the rate of delivery of blanks consists of two sensors and 2 tracking the passage of billets (rentals) through the control sections in the rolling line. Sensor 1 is installed in the control section at the delivery area for cooking from furnaces and connected to the input of the difference counter 3 pulses, and sensor 2 is installed in the control section at the end of the control section of the rolling line at the output of the calibration mill and connected to the second input of the counter 3 - The output of the difference counter 3 pulses is connected to the first input of the comparison element A. The second input of the latter is connected to the output of the setting device 5 of the normative number of rentals in the control section of the technological YaE rolling line, and its output is connected to the input of module 6, the output of which is connected to the inputs of the generator 7, the time of the driving pulses and the differentiator 8, the output of which is connected to the first input ( P4-1) of the logical element AND 9, the output of which is connected to the first input; n-times a regular reverse shift register 10; the output of each bit of which is connected to the first input one of the named logic element 11 and the second input to Each of the 1 - p logic elements AND is connected to the output of the same-named discharge of the p-bit counter 12 pulses, the summing input of which is connected to the generator output 7, the time of the driving pulses, the odes of all 1 - logic elements AND through the logical element OR 13 are connected to the input of the execution unit 14 and the reset input of the n-bit counter 12 pulses, the first input (n-4-2) of the logic element 15 is connected to the output of the sensor 2 for tracking the rental, and its output is connected to the second input of the p-bit bottom reversible About the shift register 10, the outputs of the first 16 and second 17 generators of randomly distributed pulses are connected to the second () -th and (P4-2) -th logical elements AND 9, respectively. The proposed system works as follows. When billets pass through the control cross sections, the corresponding sensors 1 and 2 generate a pulse. Billet passage through the first control cross section in which sensor 1 is installed increases the readings of difference meter 3 by one as the blank passes through the second control In which sensor 2 is installed, the unit is reset from the reading of differential meter 3. (If the reading on the meter was equal to or more than one.) As a result, the reading on counter 3 is equal to the number of blanks The output of the counter 3 is compared by the comparison element k with the task set by the setpoint 5 of the standard number of workpieces in the control section of the rolling line. at the output of the difference counter 3 or the number of workpieces (rentals) in the control area, over the standard number specified with the aid of the setting unit 5, a signal passes through module 6, which simultaneously The time of the driving pulses and the differentiator 8 steps at the inputs of the generator 7. Under the action of a signal from module 6, the operation of the generator 7 is blocked for the entire period of the signal's existence. As a result of the arrival of the signal from module 6 to the input of differentiator 8, a short-term pulse arises at the output of the latter, which is fed to the first input of the (n + 1) -th logic element 9, the output of which is connected to the first input of the reverse shift register 10. With the simultaneous presence of voltage on the same cell of the shift register 10 and the counter 12 pulses using the logic element of the same name AND and common to all 1 - logic elements AND, the element OR 13 the signal goes to the reset input of the counter 12 pulses to the input of the actuator 1. The 12-pulse counter counts the number of time of the driving pulses generated by the generator 7- When the number counted on the counter becomes equal to the unit write number on the reversing shift register, a matching pulse appears in the corresponding AND gate and OR a command is sent to the actuator 1 to deliver the next billet from the furnace and a signal to completely reset the accumulated reading from the counter 12 pulses. If more than the norm has accumulated in the control area, the generator 7 is blocked, as a result of which time the driving pulses are not generated and the formation of signals for the delivery of blanks from the furnaces is stopped. With the passage of rentals through the second control section, the pulse generated by sensor 2 simultaneously enters the second input of the differential counter 3 and the first input (n + 2) -g of the logic element 15. To the second input of the (n + 1) -th logic element I 9 the output of the first generator of 16 pulses randomly distributed in time is connected. At the output of the element And 9, a pulse arises when the pulses of two streams coincide randomly - from differentiator 8 with average statistical frequency l) j and from sensor 16 pulses with average statistical frequency | X. The number of randomly coincidental pulses will be A. Where K j is the proportionality coefficient B because the average frequency of the pulses generated by block 1b is constant, then the average statistical frequency of the pulses at the output of the logical element I 9 will be proportional to the average statistical frequency of the overflow events rolling, relative to the regulatory, control section of the rolling line. Each pulse at the output of an AND 9 element causes the unit to move in the reverse shift register 10 in the direction of increasing the discharge by one bit, and, consequently, to an increase in the interval between the times of billet output and the furnace by a single interval generated by unit 7. To the second input of the (n + 2) -th logic element I 15, the output of the second generator 17 of randomly distributed pulses is connected. At the output of the logic element I 15, randomly coincident time is obtained from the pulses of two streams — from the tracking sensor 2. with the average statistical frequency 4 and the second generator 17 randomly distributed pulses with the average statistical frequency Xf. The number of coincident pulses is equal to K - the proportionality coefficient. Since the average frequency of the pulses generated by block 17 is constant, the average statistical frequency of the pulses at the output of the logic element 15 is proportional to the average statistical frequency Vtj of the acts of passing the sensor 2 for rolling. With a random match in the time of the pulses generated by sensor 2, the passage of rolled through the second control section with pulses generated by generator 17, the unit's record in the reverse shift register 10 moves in the direction of decreasing the discharge tj by one bit, resulting in reduces the time interval between the moments of billet discharge from the furnace per unit time interval generated block 7Takim way reduce the likelihood of the interval between the times of successive blanks renditions of the furnaces is directly proportional to the average statistical frequency rentals passing through the second control section, i.e. the frequency of rolling cycles and is inversely proportional to the frequency of overflow events relative to the regulatory control section of the rolling line. Controlling the rate of delivery of blanks from heating furnaces using the proposed system makes it possible to optimize the system in terms of productivity and improve the technical and economic indicators of pipe rolling. Claims The system of controlling the rate of delivery of billets from heating furnaces, includes sensors for tracking the passage of billets (rentals) through the check points in the rolling line, differential pulse counter, generator of driving pulses, control unit for dispensing billets from the furnaces (actuating unit) and reverse shift the register of p-bits for the normative number of blanks, about t and ch and so that, in order to improve the technical and economic performance of pipe rolling, it additionally contains the second n-bit pulse counter, n + 2 logic elements AND, element OR, two generators of randomly distributed pulses in time, module, differentiator, unit of the standard number of rolled pieces in the control section of the rolling line between two control sections , and the comparison element, the first input of which is connected to the output of the differential counter, the second - to the output of the setter of the standard number of rolls, and its output - to the input of the module, the output of the last is connected to the first input. The time of the driving pulses and the input of the differentiator, the output of the latter is connected to the first input of the (n + 1) -th logical element I, the output of which is connected to the first input of the n-bit reversing shift register, the output of each bit of the last is connected to the first input of the same name logic element And the second input of each of the 1 - p logic elements And is connected to the output of the same name of the n-bit pulse counter totalizing input of the latter is connected to the generator output, the time of the driving pulses, the outputs of all 1 - p elements AND are connected via an OR element to an input of an execution unit and a resetting input of an n-bit pulse counter, the output of the rental sensor installed in the first control section during the rolling, is connected to the counting input of the differential pulse counter, the output is connected to the second input of the last the second sensor passing the workpieces through the control section, the first input (n-2) of the logical element I is connected to the same output, the output of the last is connected to the second input rever ivnogo n-bit shift register, and outputs pervog9 and second generators pulses randomly distributed in time are connected to second inputs, respectively, (n + 1) th and (n + 2) -th logic elements I. ... Sources of information taken into account in the examination 1. USSR author's certificate number 500838, cl. B. 21 B 37/00, 197. 2. USSR author's certificate number f 88l88, cl. C 05 V 15/02, 19733. USSR author's certificate No. 609564, cl. B 21 B 37/00, 1976.