JPS6415213A - Measuring instrument for length of unstable plate thickness part of rolling mill - Google Patents

Abstract

PURPOSE:To accurately calculate a faulty part length by discriminating a part having larger measured thickness deflection value taken in than a reference plate thickness value as an unstable plate thickness part length and calculating the length of the unstable plate thickness part. CONSTITUTION:An arithmetic part 10 device an absolute value of the measured plate thickness deflection of contents in a memory 8 through the reference plate thickness deflection given by a numeric value setter 9. Then, scanning from the central part of a coil to a starting end side, the corresponding coil position is calculated through pulse integrated value from a pulse generator 5 of the measured plate thickness deflection value where a value exceeding the limit is detected initially and before it to the starting end, it is made as the length of starting end plate thickness faulty part. In the same way, scanning from the center of the coil to a final end side, through the pulse integrated value detected initially, the value exceeding the limit value, the corresponding coil position is calculated and the length from it on forward to the final end is made as the length of the final end plate thickness faulty part. Then, the length of the initial end plate faulty thickness part and the length of the final end plate faulty thickness part are indicated on an indicator 11.