SU1250387A1 - Method and apparatus for automatic controlling of the cooler in continuous casting machine of blanks - Google Patents

Abstract

I. Method of automatic control of a cooler in a machine for continuous casting of workpieces, including pulling a slip from a mold with a variable speed, cooling its surface with a water-air mixture with controlling the flow rate of the cooler, changing the ratio of water and air doses in a water-air mixture according to a straight line, characterized by that, in order to improve the quality of the ingot and increase the yield of the metal, in the casting process they maintain a predetermined air pressure in the secondary cooling zone, and during the fall uu air pressure below 0.5 predetermined pressure drop over a duration of time of solidification of ingot 0.025 disable the air supply and at the same time increase the water flow in two times in comparison with a predetermined, while increasing air pressure 0.5 vsh1e predetermined pressure decrease rate twice. (L with / IsP SP about with 00 figure 1

Description

2. A device for automatic control of the chiller in the continuous casting shop of billets, containing water and air supply valves to the manifold with spray nozzles and a water flow sensor, the output of which is connected to the first input of the water flow regulator, the output of which is connected to the water supply valve, that, in order to improve the quality of the ingot and increase the yield of the metal, it is additionally equipped with an air pressure sensor, an air pressure regulator, an air pressure adjuster, a comparison unit, two m threshold elements, two timers, two keys, a setting device for reducing water consumption and a setting device for increasing water consumption, the output of the air pressure sensor connected to the first input of the air pressure regulator and the first input of the comparison unit, the second input of which is connected to the first output air pressure adjuster, the second outlet of which is connected With the second inlet of the air pressure regulator, the outlet of which is connected to the air supply valve, the output of the comparator unit is connected to the input of the first and second threshold electrons ENTOV, the output of the first threshold element is connected with the input of the first timer, the output of which soedi1

The invention relates to metallurgy, and more specifically to the continuous casting of metals.

The purpose of the invention is to improve the quality of the ingot and increase the yield of a suitable metal.

Example. Continuous casting of 17G1S steel is made on a varietal UNRS of 100x100 mm section at a speed of 2.5 m / min. The secondary cooling zone includes 1 section, equipped with air / water cooling devices of a total of 20 nozzles with a capacity of 0.4, installed on 4 facets of the ingot).

not the third input of the air pressure regulator and the first input of the first key, the second input of which is connected to the output of the setter to reduce water consumption, and the output of the first key is connected to the second input of the water consumption regulator, the output of the second threshold element is connected to the input of the second time relay, the outlet of which is connected to the fourth inlet of the air pressure regulator and the first inlet of the second key, the second inlet of which is connected to the outlet of the setter to increase the water flow, the outlet of the second key is connected to the third inlet of the regulator Dr. raskhrda water.

3. The device according to claim 2, wherein the air pressure regulator contains a comparison unit, a key and an actuator mechanism for controlling the air supply valve, the first input of the comparison unit is connected to the output of the air pressure sensor, the second input of the comparison unit is connected with the output of the air pressure adjuster, the exhaust unit of the comparison unit is connected to the output of the key, the second and third inputs of which are connected to the output of the first and second time relays, and the output of the switch is connected to the input of the actuator, the output of which is connected to the valve Lem air supply.

The specified working air pressure in the ingot is 3 "HS / cm.

In the water-air cooling mode, the water consumption for the formation of a mixture per nozzle is 0.07 m / h at a pressure of 1 kgf / cm. These parameters ensure the production of a fine water-air plume.

When the air pressure in the system drops below 1.5 kgf / cm, its atomizing capacity is lost and the prescribed flow rate of water to the nozzle with a capacity of 0.4 min is less than the minimum (0.2). Sledova

Therefore, it is necessary to double the water consumption in order to provide water cooling for the ingot.

A twofold increase in water consumption when the air pressure drops below 0.5 of the specified pressure in the main with a duration of more than 0.025 ingot solidification time allows to increase the geometry and rigidity of the flame and, therefore, to achieve uniform cooling of the ingot.

FIG. a block diagram of the device implementing the automatic cooling control method is presented using the example of one secondary cooling zone of a continuous casting machine; 2 shows the internal structure of the air pressure regulator.

The device contains pipelines 1 and 2 for supplying water and air, respectively, sensor 3 (differential pressure gauge) of water flow, sensor 4 (electrical contact gauge) air pressure, two valves 5 and 6, respectively, air supply and water, air pressure regulator 7, unit 8 air pressure, first comparison unit 9, two threshold elements 10 and P, the dead zone of which is set to a pressure of 0.5 of the given air pressure in the line, two time and time relays 12 and 13, two keys 14. and 15, two flow control units 16 and 17 water, respectively, to increase and decrease a water flow regulator 18 and a collector 19. The air pressure sensor 4 output is connected to the first inputs of the regulator 7 and the comparison unit 9, whose BtopHe inputs are connected. with the output of the setter 8, the air pressure, the third and fourth inputs of the regulator 7 are connected to the outputs of the first and second time relays 12 and 13, respectively, BeTCTBelJHo, the output of the regulator 7 is connected to the air supply valve 5, the output of the comparison unit 9 - with the inputs the first and second threshold elements 10 and 11, the outputs of the threshold elements 10 and 11, respectively, through relays 12 and 13 are connected to the first inputs of the keys 14 and 15, the second input of the key 14 is connected to the output of the water consumption setting device 16, and the second input of the key 15 to the output setting unit 17 water consumption, the outputs of the keys 14 and 15 are connected respectively naturally with per2503874

You and the second inputs of the water flow regulator 18, the third input of which is connected to the output of the water flow sensor 3, the output of the water flow regulator 18 is connected to 5 ventilation 6 of the water supply to collector 19.

The air pressure regulator 7 contains an additional comparison unit 20, an additional key 21 and an actuator 22 for controlling the air flow valve 5, the first and second inputs of the comparison unit 20 being the first and second inputs of the regulator 7, and you 15 The comparison terminal 20 is connected to the first input of the key 2I, the second and: the third inputs of which are respectively the third and fourth inputs of the controller 7, the output of the key 21 20 connected to the input of the actuator 22, the output of which is the output of the controller 7.

Piping supplies water and air to the collectors that enter the secondary sections of the secondary cooling pins in the roller sections. Water-air mixture is formed in the collectors and spraying it onto the ingot surface using nozzles installed at the ends of the outlet pipes of each collector.

The device works as follows.

Sensor 4 measures the air pressure in the air supply line. The signal from the output of sensor 4 goes to the first inputs of the controller 7 and the comparison blot 9, the second inputs of which receive a signal from the output of the setpoint 8.

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The deviation of the pressure measured by the sensor 4 from the set pressure is removed from the output of the regulator 7 and responds with an impact on the valve 5. In the case of a decrease in the deviation of the measured pressure from the predetermined pressure set below 0.5 of the specified pressure, the threshold element 10 and the relay 12 (Time). 0.025 times the solidification of the ingot, the output signal of the relay 12 is fed to the third input of the regulator 7, disconnects the sensor circuit 4 of the pressure, valve 5, regulator 7 and, acting on the first input of the key 14, opens it to skip from the code of the setpoint 16 us flow a first input of the regulator 18, the signal of which

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The water supply valve 6 opens, increasing its flow rate by a factor of two compared with the technology set value set by the setting device 16. When the air pressure is restored, i.e. with the measurement of the measured pressure 0.5 of the given pressure, the second threshold element 11, the second time relay 13 triggers, the output signal of which is fed to the fourth input of the regulator 7,

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opens the chain of the pressure sensor 4, the valve 5, the regulator 7, and also comes to the second input of the switch 15, opening it for the second input of the regulator 18 of the flow rate value to pass 5, c. The output of the setter 17, At the signal of the regulator 18, the valve 6 is opened, reducing the flow by half. The system returns to normal operation.

FIG.

Claims (3)

1. A method for automatic control of a cooler in a continuous casting machine, including pulling an ingot from a mold with a variable speed, cooling its surface with a water-air mixture, controlling the flow rate of a cooler, and changing the ratio of water and air in the water-air mixture according to a straightforward law, characterized in that, in order to improve the quality of the ingot and increase the yield of metal, during the casting process, the specified air pressure in the secondary cooling zone is maintained, and when falling pressure of air below 0.5 of the preset pressure with a drop duration of more than 0.025 times the solidification time of the ingot cuts off the air supply and at the same time doubles the water flow compared to the set pressure, and when the air pressure rises above 0.5 of the preset pressure, the flow rate is reduced by half . ~ SU .... 1250387 17 '(pufft 2. A device for automatic control of a cooler in a continuous casting machine, comprising valves for supplying water and air to a manifold with spray nozzles and a water flow sensor, the output of which is connected to the first input of the water flow regulator, the output of which is connected to a water supply valve, characterized in that , in order to improve the quality of the ingot and increase the yield of metal, it is additionally equipped with an air pressure sensor, an air pressure regulator, an air pressure adjuster, a comparison unit, two threshold elements, two time relays, two keys, a dial to reduce water flow and a dial to increase water flow, and the output of the air pressure sensor is connected to the first input of the air pressure regulator and the first input of the comparison unit, the second input of which is connected to the first output of the air pressure set the second output of which is connected to the second input of the air pressure regulator, the output of which is connected to the air supply valve, the output of the comparison unit is connected to the input of the first and second threshold elements , the output of the first threshold element is connected to the input of the first time switch, the output of which is connected to the third input of the air pressure regulator and the first input of the first key, the second input of which is connected to the output of the regulator to reduce water flow, and the output of the first key is connected to the second input of the controller water flow, the output of the second threshold element is connected to the input of the second time relay, the output of which is connected to the fourth input of the air pressure regulator and the first input of the second key, the second input of which is connected to the output the setpoint to increase the water flow, the second switch output is connected to the third input flow regulator. 3. The device according to claim 2; that the air pressure regulator comprises a comparison unit, a key and an actuator for controlling the air supply valve, wherein the first input of the comparison unit is connected to the output of the air pressure sensor, the second input of the comparison unit ^{1 is} connected to the output of the air pressure adjuster, the output of the comparison unit is connected to the output of the key, the second and the third inputs of which are connected to the output of the first and second time relays, and the key output is connected to the input of the actuator, the output of which is connected to the air supply valve.