| 摘要 |
PURPOSE:To measure accurately a contacting length with rolls for a thin hoop and to obtain the thin hoop metal having no deviation of thickness thereof by arranging an ultrasonic detector at a core shaft in hollow part of cooling roll and measuring an intensity of reflection wave caused by oscillating ultrasonic wave toward the roll barrel shell from the detector. CONSTITUTION:The ultrasonic detector 7 arranged on the inner surface of the core shaft 1 in the hollow part of a cooling roll oscillates continuously ultrasonic wave toward a radius direction of the roll barrel shell 2 through cooling water 4 as rotating together integrally with the roll in a body and receives the reflection wave from an inner surface 2a and an outer surface 2b of the barrel shell 2. This receiving wave is transmitted to a pulse receiver 10 through a cable 8 laid and wired in the core shaft 1 and a slip ring 9 set on the core shaft 1. A signal processor 12 receives the reflection wave from the pulser receiver 10 and an angle signal from a rotated angle measuring instrument 11, to calculate a paddle height. In this way, the contacting length of roll for the thin hoop is surely measured and the thickness of thin hoop is effectively controlled by this measuring value.
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