SPEED CHANGEOVER METHOD FOR ARC FURNACE ELECTRODE ELEVATING/SINKING DEVICE

PURPOSE:To shorten the operating time of an arc furnace by making automatic operation from the electrode upper limit position without requiring manual intervention of the operator, and letting it to descend until current starts to flow at the maximum value of manual operating speed. CONSTITUTION:Scr...

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Bibliographische Detailangaben
Hauptverfasser:	KASUGA TOSHIAKI, TSURUTA MASAMI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY FURNACES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING KILNS LIGHTING MECHANICAL ENGINEERING OVENS RETORTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To shorten the operating time of an arc furnace by making automatic operation from the electrode upper limit position without requiring manual intervention of the operator, and letting it to descend until current starts to flow at the maximum value of manual operating speed. CONSTITUTION:Scrap 40 is put in the furnace body 18 of an AC arc furnace, and three electrodes 10 are fed with three-phase power from a three-phase transformer. The three electrodes 10 are rapidly discended from the upper limit position at the max. speed of manual operation mode. When either of them touches the scrap, the electrode speed is changed over into the automatic operation mode. Even when the two electrodes touch the scrap to cause current flow, they can be pulled up immediately because the electrode speed in the automatic operation mode is sufficiently lower than the speed by the manual operation mode, and can be changed to the constant impedance control without generating hunting phenomenon.