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Patent Searching and Data


Title:
METHOD AND DEVICE FOR CONTROLLING LIFTING OF ELECTRODE OF ARC FURNACE
Document Type and Number:
Japanese Patent JP2014032782
Kind Code:
A
Abstract:

To provide a device for controlling lifting of electrodes of an arc furnace capable of preventing generation of splash.

A device 8 for controlling lifting of electrodes of an arc furnace is used for an arc furnace melting a processed object by supplying a power from an AC power supply 2 to electrodes 3a, 3b, and 3c provided liftably, and controls lifting of the electrodes 3a, 3b, and 3c. The device 8 for controlling lifting of electrodes of an arc furnace includes: an electrode lifting control circuit 21 making the electrodes 3a, 3b, and 3c descend when detection values of currents flowing in the electrodes 3a, 3b, and 3c are smaller than a predetermined set current value, and making the electrodes 3a, 3b, and 3c ascend when the detection values of the currents flowing in the electrodes are larger than the set current value; and an electrode thrust-in prevention circuit 22 stopping the descent of the electrodes 3a, 3b, and 3c when the detection values of the currents flowing in the electrodes 3a, 3b, and 3c is equal to or less than a predetermined current value that is equal to or less than the set current value and a detection value of a voltage between the electrodes 3a, 3b, and 3c and the grounded arc furnace is equal to or more than a predetermined voltage value.


Inventors:
KAWAI TAKANARI
SUGIMORI HIROICHI
MIZUNO TSUGIAKI
Application Number:
JP2012000171515
Publication Date:
February 20, 2014
Filing Date:
August 01, 2012
Export Citation:
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Assignee:
JFE MATERIAL CO LTD
International Classes:
H05B7/148; F27B3/20; F27D11/10
Domestic Patent References:
JPH10208871A1998-08-07
JPH10185437A1998-07-14
JP2001004281A2001-01-12
JP2000077180A2000-03-14
Foreign References:
US5115447A1992-05-19
Attorney, Agent or Firm:
Toshiyuki Shiojima