RU184U1 - Device for regulating the electric mode of a single-electrode flux melting plant - Google Patents

Abstract

A device for controlling the electric mode of a single-electrode flux-smelting installation, containing a current transformer in the electrode circuit and an electromechanical electrode displacement drive, characterized in that it is additionally equipped with a current rms sensor, a filter, a comparator with an adjustable dead band, an analog inverter and an output amplifier, a current transformer output connected to the input of the sensor of the current value, the output of which through the filter is connected to one of the two inputs of the compar an amplifier with an adjustable dead band, to the other input of which a current setting signal is supplied, the first output of a comparator with an adjustable dead band is connected to one of the two inputs of the output amplifier, the second output through an analog inverter to the other input of the output amplifier, the output of which is connected to the input of the electromechanical drive moving the electrode.

Description

1G 93-038103 / 07

ELECTRIC REGULATION DAY DEVICE ONE-SHEEP-HOUSING SHESHAVEL INSTALLATION

Devices © are electrothermal and can be used in the regulation of the electric mode of a pressurized installation,

Lime © for the regulation of the electric mode of a single-electrode installation, containing current and voltage sensors of the slag bath in the electrode control circuit connected to the inputs of the slag bath resistance sensor and the threshold amplifier unit, a summing amplifier unit and a thyristor converter with an electromechanical electrode movement drive / I /. A disadvantage of the known device is that its use for regulating the electric mode of the flux-smelting installation without reconstruction installation itself is not possible.

The closest in technical detail to the claimed device is a device for regulating the electric mode of a single-electrode flux "smelter installation / 2 / containing a current transformer and an electromechanical drive for moving the electrode. A disadvantage of the known device is the following. The operation of the flux-smelting plant can conditionally be divided into two periods — the period of melting of the liquid and the period of adjusting the liquid slag to the operating temperature before pouring. The melting period of the flux is characterized by the fact that in the initial period the installation operates in an arc mode. In this regard, this period is the most beskeyneymy, unstable period of operation of the installation. Possible rather large spasmodic deviations

electric mode. And because of the tag, that the synchronous electric drive fulfills the deviations of the electric mode on only one working

MNI N 05 V 7/18

By application I 93-038103 / 07

The goal is to increase the speed of action and accuracy of maintaining a given mode.

This goal is achieved by the fact that a device for controlling the electric mode of a single-electrode installation, containing a current transformer & electrode circuits and an electromechanical drive for moving the electrode, is equipped with a filter, an effective current sensor, a comparator with adjustable deadband, an analog inverter and an output amplifier. With this ®, the output of the transformer is connected to the input of the current ® current value sensor, the output of which through the filter is connected to one of the two input-voltage comparators with an adjustable deadband, the input of which receives a current setpoint, the first output of the comparator with an adjustable dead zone is connected by one of the two inputs of the output amplifier, the second output through an analog inverter with the other input of the output amplifier, the output of which is connected to the input of the electromechanical movement of the electrode.

In FIG. I block is presented - scheme of regulation for regulation

electric mode vdnvlektrodnvy fluxpavilnoy installation.

The control device comprises a current transformer I included in the secondary circuit of the power transformer 2, a current effective value sensor 3, a filter 4, an adjustable dead band communicator 5, an analog inverter 6, and an output amplifier and an electromachine drive 8 for moving the electron beam.

The device operates as follows. The signal from the output of the transformer is fed to the input of the sensor 3 of the current value. From the output of which the converted signal through the filter 4 is fed to one of the two inputs of the comparator 5 with an adjustable dead band, the current setpoint signal is received at the other input. The comparator compares these two signals between you and amplifies.

J # # Ј0 & 4

To application Ј 93-038103 / 07С,

- / trod 9 moves down. The misregistration signal of negative polarity of the inverting peel by the analog inverter 6 is fed to the other input of the output amplifier 7. The electromechanical drive 8 moves the electrode 9 up to eliminate the mismatch signal. Comparator 5 is configured for minimum and maximum dead zones. The minimum deadband is set at 2 3% of the rated current, and the maximum zone at 5 10%. When working out the mismatch signal between the minimum and maximum dead zones, the output amplifier 7 gives a signal to move the electrode with an operating speed d® until the mismatch signal is less than the minimum dead band.

When a signal appears outside the maximum deadband, the output amplifier 7 provides a signal and the electrode moves at a marching speed. At the same time, the error signal in the comparator 5 reduces the maximum deadband to the minimum, for example, from 10% to 2%. The movement of the electrode occurs until the mismatch is less than the minimum deadband.

Thus, the introduction of the comparator 5 into the control device allows for large mismatch signals to quickly respond to these deviations and eliminate them, i.e. increases the speed of the device for regulating the electric mode.

The source of information:

I. Technical description. Regulators of the ARShMT-2 series for electroslag remelting furnaces. Cheboksary, 1077.

2. Electroslag furnace Edited by B.E. Paton and B.I. Medovar / Kiev, Naukova Dumka, 1976, p. 323-330.

Claims (1)

A device for controlling the electric mode of a single-electrode flux-smelting installation, containing a current transformer in the electrode circuit and an electromechanical electrode displacement drive, characterized in that it is additionally equipped with a current rms sensor, a filter, a comparator with an adjustable dead band, an analog inverter and an output amplifier, a current transformer output connected to the input of the sensor of the current value, the output of which through the filter is connected to one of the two inputs of the compar an amplifier with an adjustable dead band, to the other input of which a current setting signal is supplied, the first output of a comparator with an adjustable dead band is connected to one of the two inputs of the output amplifier, the second output through an analog inverter to the other input of the output amplifier, the output of which is connected to the input of the electromechanical drive moving the electrode.