strip passing abnormality detection device and Tsu-ban anomaly detection method

摘要

PROBLEM TO BE SOLVED: To provide a device and method for detecting steel sheet-passing failure, capable of performing the sheet-passing failure detection in a highly reliable rough rolling machine.SOLUTION: The rolling load of a rough rolling stand R2 in a rough rolling machine 5 of a hot rolling line is measured by a load cell, and material clogging at an exit-side in the rough rolling stand R2 is detected based on the time variation &Dgr;P of the rolling load. Taking into account the fact that when material clogging occurs, the rolling load rapidly increases or decreases, when the time variation P of the rolling load is out of an allowance, it is determined that material clogging occurs, and the operation of hot rolling line is emergency-stopped on the basis of such determination.