Patent ID: 6839605

Claim:
An apparatus for diagnosing faults in hot strip finishing rolling, comprising: a Supervisory Control Computer (SCC) setting unit for applying preset target values; an actually measured data collection unit for collecting actually measured data; an exit side thickness gauge loaded-on determination unit for determining whether an exit side thickness gauge is loaded on, and starting diagnoses of the faults in the hot strip finishing rolling if the exit side thickness gauge is loaded on; a part identification unit for identifying a front end part, body part and tail end part of a rolled sheet using thickness data; an on-gauge ratio calculation unit for calculating on-gauge ratios on the front end part, the body part and the tail end part using the actually measured data collected by the actually measured data collection unit and the preset target values set in the SCC setting unit; a primary fault determination unit for determining whether faults have occurred in the front end part, the body part and the tail end part using values output from the actually measured data collection unit and the on-gauge ratio calculation unit; a secondary fault determination unit for determining whether an operator intervention fault, a material fault, a facility fault and a control fault have occurred using values output from the actually measured data collection unit and the preset target values set in the SCC setting unit; and a confidence rate evaluation unit for evaluating confidence rates of determination results of the secondary fault determination unit using the preset target values set in the SCC setting unit and the actually measured values.