Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ARC FURNACE ELECTRODE LIFTING DEVICE
Document Type and Number:
Japanese Patent JP2008202867
Kind Code:
A
Abstract:

To provide an arc furnace electrode lifting device capable of saving energy of furnace operation, and capable of shortening operation time.

This arc furnace electrode lifting device is composed of an impedance constant control means 82 controlling so that impedance between an electrode 4 and a scrap 5 becomes constant, a constant current control means 83 controlling so that an arc current becomes a preset value, a switching means 84 switching the impedance constant control means 82 and the constant current control means 83, an electric power consumption checking means 86 determining whether or not electric power consumption of an arc furnace becomes a predetermined value or more, a flicker checking means 87 determining whether or not a flicker quantity becomes a predetermined value or less for a predetermined time, a furnace state checking means 88 determining whether or not both arc voltage and the arc current become a predetermined value or less for a predetermined time, and an arithmetic operation means 89 arithmetically processing a determining result of the electric power consumption checking means 86, the flicker checking means 87 and the furnace state checking means 88. The switching means 84 is operated by a result of the arithmetic operation means 89.


Inventors:
ASAKA TAKATOSHI
Application Number:
JP2007040208A
Publication Date:
September 04, 2008
Filing Date:
February 21, 2007
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TOSHIBA MITSUBISHI ELEC INC
International Classes:
F27D11/08; F27B3/20; F27B3/28; H05B7/148; C21C5/52
Domestic Patent References:
JP2001250673A2001-09-14
Attorney, Agent or Firm:
Hajime Yamashita