| 摘要 |
An inspection equipment to detect twist of a wire rope with high precision by taking influences of change in the rope pitch due to the relative movement between the rope and the inspection equipment and tension of the rope into consideration, a magnetization device (2) magnetizes a wire rope (1) in a longitudinal direction thereof, the wire rope being produced by twisting steel wire bundles; magnetic detectors (8a-8h) disposed near the wire rope detect magnetic flux leakage from the wire rope, an arithmetic unit calculates (9,10,11) a rope pitch using a relative velocity between the wire rope and the inspection equipment from an encoder (7) and the magnetic flux leakage and corrects (12) elongation of the rope due to the tension measured by a tension measurement unit (6,13) based on the calculated pitch to thereby calculate (14,15) twist of the rope, and supplies results of the calculation to determine acceptability or inacceptability of the rope (16,17). |
