COIL DIAMETER MEASURING INSTRUMENT IN COILING DEVICE

摘要

PURPOSE:To improve the measuring accuracy by measuring the coil diameter by using an arm angle measured value of a blocker roll supporting arm which is varied in accordance with the coiling quantity of a running material to a coiling drum. CONSTITUTION:As a rolled stock coils around a coiling drum 3 and the number of times of coiling increases, each blocker roll 5 is pushed up to the outside in the radial direction of the coiling drum 3, and an arm angle theta of a supporting arm 5A is varied in accordance therewith. Each coil thickness arithmetic circuit 13a-13d operates thickness G of a coil by an expression 1. A learning control circuit 14 inputs an output of each coil thickness arithmetic circuit 13a-13d, decides and evaluates the consistency of the previous arithmetic value and the present arithmetic value of thickness of the coil, and in the case of mismatching, an arithmetic operation for calculating a correct value is executed, and its output is sent out to a coil diameter arithmetic circuit 15. The coil diameter arithmetic circuit 15 operates the coil diameter D, based on an expression 2. Accordingly, it is unnecessary to use plate thickness of the rolled stock A and a rolling speed as arithmetic parameters, and the coil diameter can be measured by using the coil thickness G being a measured value and a known parameter.