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Title:
ARC FURNACE ELECTRODE LIFTING DEVICE
Document Type and Number:
Japanese Patent JP2014060112
Kind Code:
A
Abstract:

To provide an arc furnace electrode lifting device for shortening operation time and reducing power costs.

An arc furnace electrode lifting device comprises: an arc current setting unit; an electrode migration distance setting unit for setting an electrode migration distance after a lapse of prescribed time from the start of operation; an electrode migration distance calculation unit for calculating an actual migration distance L of an electrode; an impedance constant control unit for controlling lifting drive of the electrode so that impedance between the electrode and a scrap is constant on the basis of an arc current setting value Is as a reference value; a current constant control unit for controlling the lifting drive of the electrode so that actual arc current I is made to be the setting value; a control switching unit for selectively switching the impedance constant control unit and the current constant control unit; an electrode lifting electric motor drive unit for controlling power for driving an electrode lifting electric motor by receiving a control signal from the impedance constant control unit or the current constant control unit; and an electrode migration distance check unit for comparing the actual migration distance and the set migration distance, where the control switching unit is activated depending on a result of the electrode migration distance check unit.


Inventors:
ASAKA TAKATOSHI
Application Number:
JP2012000205784
Publication Date:
April 03, 2014
Filing Date:
September 19, 2012
Export Citation:
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Assignee:
TOSHIBA MITSUBISHI ELEC INC
International Classes:
H05B7/11; F27D11/08; H05B7/109; H05B7/148
Domestic Patent References:
JP2008202867A2008-09-04
JPS60208084A1985-10-19
JP2001250673A2001-09-14
JPH07161473A1995-06-23
JP2008202867A2008-09-04
JPS60208084A1985-10-19
JP2001250673A2001-09-14
JPH07161473A1995-06-23
Attorney, Agent or Firm:
Amagi International Patent Office



 
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