SU512467A1 - System for automatic control of a continuous casting machine - Google Patents

Description

one

Lime system for automatic control of the machine for continuous casting of steel by ed. St. No. 490091, on the console of which the indicating devices and command devices are concentrated.

The proposed device makes it possible to improve the quality of the output metal and the productivity of the machine and to coordinate the operation of the elements of the gas cutting system and the secondary cooling device. A feature of the system is that there are gas cutter control units and secondary cooling devices connected in parallel to the sensor, fixing it to the end of the casting. The control mode switches of these units are connected to the switchgear and control unit of the control panel.

The drawing shows a block diagram of the system.

The device contains a unit that automatically controls the flow of metal from the main casting ladle to the intermediate one, a unit that automatically regulates the flow of metal from the intermediate goat to the mold, and units that automatically control the secondary cooling and gas cutting.

A unit that automatically regulates the flow of metal into the tundish 1 s

using stopper 2 of the main steel teeming ladle 3, contains strain gauge transducers 4, electronic unit 5, level indicator 6 with a two-position controller integrated in the level indicator, pyvo-hydraulic actuator 7 for directing the stopper with electric valve 8 and compressor 9.

The weft bucket 1 is mounted on three strain gauge converters 4 mounted in a tilt-and-turn table. In the converters, arising from the weight of the bucket with metal, enters the electronic unit 5, in which the automatic weight subtraction circuit of the intermediate-intermediate goat is applied, and after amplification by the pointer 6 of the level placed on the casting control panel 10. The 6 level indicator indicates the change in the level (weight) of the metal in the ladle, simulating the position of the level on the scale.

A two-stage controller allows you to set the desired level fluctuation zone. The controller sends an electrical signal to the electropneumatic valve 8, which controls the operation of the actuator 7, which is mounted on the main casting ladle 3 and supports, through the stopper 2, the level of the metal in the tundish 1 in predetermined limits.

The additional mechanism is made on-off, pneumohydroelectric, removable.

The block K, which automatically controls the flow of metal into the crystallizer 11, is based on a radioisotope method for determining the level of the metal in the crystallizer. With the help of stonor 12 tundish 1, he regulates the flow of liquid metal from KOBDja. The unit consists of a gamma-ray source 13; a group of 14 Geiger counters, a converter 15, a level indicator 16, an electronic controller 17, an actuator 18.

The gamma-ray source is embedded inside the copper wall of the crystallizer 11 and is made of several Soeo emitters inserted into a metal rod with a total activity of less than Im-Cu.

 14 Geiger gas-discharge counters are built into the opposite wall of the crystallizer I. Depending on the position of the metal level, the irradiated volume of the counters changes, according to which the counters produce a note of impulses to the converter 15. The converter produces a direct current proportional to the level of the metal in the crystallizer, and supplies it to the electronic controller 17. The regulation system is based on the effect of the actuator 18 on the stopper 12, depending on the deviations of the metal level and scab its deflection that provides reliable automatic regulation even under considerable erosion elements of the locking mechanism of the tundish.

The level indicator is located on the casting control panel.

The actuator 18 is electrically, removable, double acting and mounted on a tundish.

The controller 17 sends electrical signals to the executive mechanism 18, which moves the tundish stopper, coordinating the metal consumption from the ladle with the speed of the ingot extrusion, keeping the metal level in the crystallizer I constant.

The automatic control units for secondary cooling and gas cutting are based on the use of counting devices, which use to drive a flying machine for measuring the path, successively turn on or off the secondary cooling sections and gas cutting elements.

The automatic control units for secondary cooling and gas cutting are independent of each other and operate from the same sensors.

The automatic secondary cooling unit contains a sensor 19 associated with a drive of 20 tons of the machine's bottom stand; a counting mechanism 21 with a relay output; electrified valves 22 controlling the supply of water to the secondary cooling sections (io one for each section); a switch 23 of a switchgear for electing control mounted on the control panel 10 of the machine and providing a transition from automatic control to remote control and back; sensor 24, fixing

end of casting.

The system also contains secondary cooling sections 25, 26, 27.

The sensor 19 is mounted on the drive of the lower stand and, when the drive is in operation, supplies 21 counts to the counting mechanism, the gaps between which correspond to a certain length of the path traversed by the ingot. On the counting mechanism, values are set corresponding to the lengths of the sections of the secondary

cooling. When the head part of the ingot leaves the crystallizer and approaches the cooling sections, the counting mechanism 21 triggers and the electrified valves 22 are sequentially turned on to supply water to the secondary cooling sections. At the end of the casting, the sensor 24 installed at the mold, gives impulses to the counting mechanism 21 to stop the water supply to the extent of exiting the end sections

ingot. The control of the secondary cooling sections is intended to prevent overcooling of the head and tail parts of the ingot. Gas automatic control unit

sharply comprises a sensor 19 associated with the drive of the machine's lower stand; sensor 24, fixing the end of casting; a counting mechanism 28 with a relay output; commutation switch 29

a device for electing control mounted on the control panel 10 of the machine and providing a transition from the automatic control of the gas-cutting device to the remote and back.

The counting mechanism 28 is similar to the counting mechanism 21, but is equipped with control devices for the length of the blanks into which the ingot is cut. The pulses sent by the sensor 19 to the counting mechanism 28 determine the length of the path traveled by the ingot or by cutting off the workpiece from it. At the setting unit of the counting mechanism 28, the required length of the blanks is set. In the production of the first cut, the counting mechanism 28, counting out the predetermined length of the workpiece, closes the values of the corresponding relay devices to turn on the elements of gas cutting.

After the end of the cut, the gas cutting elements are turned off and automatically switched on again after the next workpiece length reading.

When the end of the ingot leaves the crystallizer 11, the sensor 24 gives a pulse to the counting mechanism 28, which makes it possible to determine

the length of the end of the ingot and calculate more you