The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 1977
Filed:
Dec. 11, 1975
Conny Andersson, Viken, SW;
Sven-Einar Stenkvist, Vasteras, SW;
ASEA Aktiebolag, Vasteras, SW;
Abstract
A DC arc furnace having a hearth through which electric power can be transmitted to a melt formed on the hearth to form a positive connection permitting the arcing electrode or electrodes to be negatively connected to a DC power source, to operate as a cathode with improved operational characteristics, is made with its hearth enclosure having one or more permanent openings required for the normal operation of any arc furnace, this opening being exemplified by a deslagging port through which slag is removed by tilting the furnace in the direction of the port. The hearth connection is unsuitable for use when the furnace is charged initially with solid metal, so at that time a starting electrode positively connected to the power source, must be inserted through the hearth enclosure and into contact with the charge, the arcing electrode or electrodes then melting down the charge and forming a melt on the hearth permitting the hearth connection to become effective, after which the starting electrode is removed from the furnace. This starting electrode is mounted outside of the furnace by a permanent mounting supporting the starting electrode movably so that it can be inserted through the permanent opening, such as the deslagging port, into contact with the charge of solid metal, and after performing its function, permitting the electrode to be removed through the permanent opening so that furnace operation can thereafter be carried out in the normal manner. In the case of a tilting furnace the furnace can be tilted for deslagging and ultimately for tapping of the melt.