Ladle preheat indication system

Details Ladle preheat indication system Ladle preheat indication system

1998-09-04

1999-11-09

Paschall, Mark

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219492, 219497, 219421, 219425, 374107, 266242, 266 44, H05B 102

Patent

active

059819170

ABSTRACT:
A ladle preheating system and method in which heat input rate to the ladle is calculated and monitored throughout the preheating period, calculating the moving average slope representing change over time of the rate of change of heat input, correcting the moving average slope for unavoidable variations in the measurements of the heat input rate, calculating the change of the moving average slope over time (the approximate second derivative), and signaling to an operator the readiness of the ladle based upon this second derivative's falling below a preset criteria indicating a fully preheated ladle.

REFERENCES:
patent: 3907260 (1975-09-01), Leatherby
patent: 4014532 (1977-03-01), Holey
patent: 4086805 (1978-05-01), Kinderling et al.
patent: 4223873 (1980-09-01), Battles
patent: 4229211 (1980-10-01), Battles
patent: 4359209 (1982-11-01), Johns
patent: 4394566 (1983-07-01), Magnusson
patent: 4462698 (1984-07-01), Ely
patent: 4718643 (1988-01-01), Gitman
patent: 4870235 (1989-09-01), Steers et al.
patent: 5249866 (1993-10-01), Dube et al.
patent: 5364185 (1994-11-01), VanZandt et al.

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