Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
製鋼用アーク炉の電極昇降装置
Document Type and Number:
Japanese Patent JP5343421
Kind Code:
B2
Abstract:

To provide an electrode lifting/lowering device of an arc furnace for steel making capable of changing over a dead zone width to a proper value according to a status of the furnace, and improving efficiency in furnace operation and the adjustment of the dead zone width.

This electrode lifting/lowering device comprises an electrode 3 generating an arc between a scrap 2 and the furnace in a furnace body 1 and melting the scrap 2, an electrode lifting/lowering control board 6 for lifting and lowering the electrode 3 by controlling an electric motor 5, a comparing unit 7 outputting a corresponding speed command value to the electric motor 5 so that an actual current and an actual voltage supplied to the electrode 3 are agreed with set values, and a sensitivity dead zone characteristic generator 13 outputting the command value based on the prescribed dead zone characteristic curve or zero to the electrode lifting/lowering control board 6 on the basis of the speed command value outputted from the comparing unit 7. Furthermore, a dead zone automatic adjusting circuit 15 is disposed to adjust the dead zone width of the sensitivity dead zone characteristic generator 13, so that the dead zone width is automatically adjusted on the basis of a lapse time after the start of charging to the electrode 3.

COPYRIGHT: (C)2010,JPO&INPIT


Inventors:
Takatoshi Asaka
Application Number:
JP2008173379A
Publication Date:
November 13, 2013
Filing Date:
July 02, 2008
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
Toshiba Mitsubishi Electric Industrial Systems Co., Ltd.
International Classes:
F27D11/08; F27B3/08; F27B3/28; F27D11/10; H05B7/152; C21C5/52
Domestic Patent References:
JP2003083680A
JP2007085669A
JP6137774A
JP9014864A
JP7042083U
JP59170995U
Attorney, Agent or Firm:
Mamoru Takada
Hideki Takahashi



 
Previous Patent: JPS5343420

Next Patent: CHINESE CHARACTER INPUT DEVICE