SU937106A1 - Apparatus for automatic control of secondary cooling of ingot in metal continuous casting machine - Google Patents

Description

(5) AUTOMATIC REGULATION DEVICE FOR SECONDARY COOLING INGOT INTO CONTINUOUS METAL CASTING

one

The invention relates to continuous casting of metals and can be used in control systems of the secondary cooling mode on continuous casting machines.

A device for controlling the continuous casting process, a metal, consisting of cooling water flow controllers to separate sections of the secondary cooling zone, flow rate controllers, a casting speed meter acting on the setters, thermocouples of one-time immersion measuring the temperature of the liquid metal supplied to the machine, is known a normalizing converter with memory, which stores this temperature in the form of a unified output current, a generator of the nominal temperature of the liquid metal, an algebraic adder, the output of which is allocated to the difference between the target value of the cooking

the temperature of the liquid metal and the actual temperature of the metal supplied to the machine, the signal distributor, which distributes the difference of differences with different coefficients of proportionality to the flow controllers of the individual sections of the secondary cooling zone lj.

Closest to the invention

fO by technical nature is a device manager1 | 1 process of continuous metal casting, consisting of a cooling water flow regulator to a separate section of the zone

15 secondary cooling, a cooling water flow meter connected to one of the controller inputs, an ingot surface temperature controller, the first input of which is connected to the output of an ingot surface temperature meter, the second one behind an ingot surface temperature sensor, a casting rate meter acting on the regulator Torus cooling water flow f2J.

The disadvantage of the device is that it does not take into account the possible overheating of the liquid metal. When the liquid metal overheats above the liquidus temperature, the rate of increase of the hardened metal crust in a continuous metal casting machine slows down (on average, for every 5 ° C overheating, the rate of increase of the crust drops by 8-10). In a thinner crust, even small thermal stresses can cause the appearance of cracks leading to metal breakthrough.

The purpose of the invention is to improve the homogeneity of the internal structure of the continuous ingot and improve its quality.

The goal is achieved by the fact that the device for automatic regulation of the secondary cooling of the ingot, containing a flow controller for cooling water to a separate section of the secondary cooling zone, a meter for cooling water connected to one of the inputs for the cooling water flow controller, an ingot surface temperature controller, the first input of which is connected to the output of the ingot surface temperature meter, the second to the unit for ingot surface temperature, and the output to the second input of the flow regulator cooling water, measure the casting rate, the thermocouple of one-time immersion, subsequently measuring the temperature of the liquid metal in the intermediate tank, normalizing transducer with memory, storing this temperature in the form of a unified output signal, algebraic adder, p i signal distributor over various sections m secondary cooling zone, the signal limiter connected to one of the outputs of the distributor, the second algebraic adder, the first input of which is connected to the output a signal limiter; to the second, a casting rate meter; the output of the second algebraic adder is connected to the third input of the cooling water flow regulator; the unit for the nominal temperature of the liquid metal is connected to the second input of the adder.

As adders, setters, signal distributors, etc. serial blocks of the AKESR series can be used. The transfer function of the limiter has the following form: it Kx, with X A; at KA, at X “g L. As the temperature sensors of the liquid metal - domestic serial replaceable blocks TPR-2075.

The drawing shows a block diagram of the device.

The device comprises cooling water flow controller 1 to a separate section of the secondary cooling zone, cooling water flow meter 2 connected to the first input of controller 1, ingot surface temperature controller 3 connected to the second input of cooling water controller 1, surface temperature meter ingot, the output of which is connected to the first input of the regulator 3 of the surface of the ingot, unit 5 of the nominal temperature. The ingot surface connected to the second input of the regulator 3 temperature, meter 6 casting speed, the algebraic adder 7 on the first input of which is connected to the meter 6, and the output is connected to the third input of the cooling water controller 1, a limiter 8 signals connected to the second input of the algebraic adder 7 distributor 9 signals distributing the difference between the actual and the nominal temperature of the liquid metal on the limiters 8 signals, the second algebraic adder 10 connected to the input of the distributor 9 signals, the normalizing converter 11 with memory that stores the temperature of the liquid metal in intermediate capacitance and bone and connected to the first input of the algebraic adder 10, unit 12 of the nominal temperature of the liquid metal connected to the second input of the algebraic adder 10, thermocouple 13 single immersion connected to the input of the normalizing memory converter P with memory.

The device works as follows.

Claims (2)

The operation of one stream and one section in this stream is considered, the work of the remaining streams and sections is similar. 5 During the casting process, the signal from the thermocouple 13 of a single immersion, measuring the temperature of the liquid metal in the intermediate tank, through the normalizing converter 11, which stores this temperature in the form of a unified signal, goes to the adder 10. To the other input of the adder 10, the signal from unit 12, proportional to the nominal temperature of the liquid metal. The difference obtained at adder 10 between the liquid metal temperature value specified for a given brand and the actual metal temperature at the distributor 9 signals for transmitting the effect simultaneously to the limiters 8 signals from all sections of the secondary cooling zone. Depending on the size of the input signal, we have either a constant signal (if there is no metal overheating) or a signal proportional to the output signal of the distributor 9, i.e. overheating metal. With the limiter 8, the signal arrives at the first input of the algebraic adder 1, to the other input of the algebraic adder 7 receives a signal from the meter 6 casting speed. The signal received at the second input of the adder 7, corrected for the initial overheating of the metal, is fed to the first input of the cooling water flow controller 1,. The second input of regulator 1 of cooling WATER receives a signal from regulator 3 of the ingot surface temperature, depending on the difference between the nominal temperature of the ingot surface fed to regulator 3 from setpoint 5 and actual ingot surface temperature to controller 3c. The signals from the second input of the algebraic adder 7 and the regulator 3 of the ingot surface temperature form the total reference on the cooling water regulator 1. The third input of the cooling water controller 1 receives a signal from the water flow meter 2. Depending on the difference between the set and measured water flow rates, the regulator 1 produces control actions that remove the existing mismatch. 6 The advantage of the proposed device is that it allows to increase the homogeneity of the internal structure of the ingot due to the additional superheat control unit introduced; Idky metal summed to the car. The economic effect from the introduction of the invention is 120 thousand rubles. The invention The device for automatic regulation of ingot secondary cooling on a continuous metal casting machine, comprising a cooling water flow controller to a separate section of the secondary cooling zone, a cooling water flow meter connected to one of the cooling water flow controller inputs, an ingot surface temperature controller, the first the input of which is connected to the output of the ingot surface temperature gauge, the second one - with the unit temperature control of the ingot surface, and the output - to the second input cooling water flow controller, casting rate meter, characterized in that, in order to improve the homogeneity of the internal structure of the continuous ingot and improve its quality, it further comprises a single-dip thermocouple, a normalizing memory converter, an algebraic adder, a signal distributor for different sections secondary cooling zones, a signal limiter, a setter for the nominal temperature of the cast metal, a second algebraic adder, the thermocouple output being connected to in the house of the normalizing converter, the output of which is connected to the input of the adder, another input of which is connected to the output of the setpoint device of the nominal temperature of the liquid metal, and the output to the input of the signal distributor, the output from the signal distributor is connected to the input of the signal limiter, the output of which is connected to the input of the second adder, another the input of which is connected to the speed meter, and the output - to the coolant flow regulator. 7937106 Sources of information taken into account in the examination of 1, Krasnov BI Optimal control of continuous casting modes. M., Metallurgists, 1975, p. 25c-259. 2. Krasnov B.I. and others. Management of the secondary cooling mode of a continuous ingot from curvilinear caster  II KKTs 2 NLMZ. Automation of metallurgical production, Moscow, Metallurgists, 1977, No. 5, p. 107. AND geys-0