Control apparatus for controlling movements of an electrode in a

Details Control apparatus for controlling movements of an electrode in a Control apparatus for controlling movements of an electrode in a

1983-11-16

1986-04-29

Moose, Jr., Harry E.

Industrial electric heating furnaces

Arc furnace device

Power supply system

373105, H05B 7156

Patent

active

045861870

ABSTRACT:
The electrode of an electric arc melting furnace is adjusted in height by a hydraulic cylinder having an operating chamber which is connected via a servo valve to a hydraulic pressure source or, respectively, to a reservoir. The servo valve is actuated by a control signal which is produced by a comparison of the actual value of the electric arc current and a predetermined desired current value. Additionally, the pressure in the operating chamber of the cylinder is measured and supplied to the control circuit as a feedback value. An important advantage deriving from the present invention is the ability to provide a control of the electrode motion by virtue of the measured pressure even before the electric arc is ignited and to steadily hydraulically support the electrode under any condition of operation. Accordingly, uncontrolled motions of the electrode are prevented which motions might result in an increased danger of breakage, in overcurrents or short-circuits.

REFERENCES:
patent: 2921107 (1960-01-01), Toothman et al.
patent: 2989616 (1961-06-01), Mironoff
patent: 3173052 (1965-03-01), Moore
patent: 3300562 (1967-01-01), Moore
patent: 4213955 (1980-06-01), Casciani et al.
patent: 4324944 (1982-04-01), Weilrich et al.

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