Method of lowering electrodes of an electric-arc furnace
AssigneeM.A.N. Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
InventorsLothar Harmsen, Friedhelm Vennmann, Jurgen Zieschang
Life of this patent
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Abstract
A method of lowering graphite electrodes which are supported vertically displaceable electrode holders and extend through the cover of an electric arc furnace is disclosed. In accordance with the disclosed method, the furnace cover is completely laterally swung away from the furnace vessel and then the free lengths of the electrodes below the electrode clamps are adjusted to a position insuring a stable electric arc.
Claims6
A method of lowering graphite electrodes of the type having free lengths and electrode clamps clamped about the electrodes, the electrodes being supported by vertically displaceable electrode holders being extended through the cover of an electric-arc furnace, comprising the steps of, initially, laterally swinging the furnace cover completely away from the furnace and over stop means against which each electrode is engageable for setting a free length of each electrode below each electrode clamp to a length which insures a stable electric arc, disengaging the electrode clamps from the electrodes, and adjusting the free lengths of the electrodes below the electrode clamps to the lengths which insure a stable electric arc using the stop means.
A method of resetting the position of a plurality of graphite electrodes supported by respective vertically displaceable electrode holders each having an electrode clamp for clasping a respective electrode, with the electrodes extending vertically through a roof of an electric arc furnace having a furnace shell, comprising:
- first swinging the furnace roof with the electrodes laterally completely away from the furnace shell and over stop means for establishing a selected level for lower ends of the electrodes;
- and
- thereafter with the roof and electrodes away from the furnace shell, adjusting a free length of each electrode below each respective electrode clamp to an amount which insures a stable arc and which corresponds to the selected level, each clamp being unclasped from said respective electrode at at least one point during said adjusting operation and the stop means being used to stop the lower ends of the electrode at the selected level.
Dependencies are inferred from the claim text.