Damage detection method of wire rope, and signal processor and damage detection device used for damage detection of wire rope

A portable damage detection device including a moving mechanism, comprising:

• a portable damage detection device including a magnetizing device which has a columnar internal space through which a wire rope passes, the internal space having a diameter larger than a diameter of the wire rope, the magnetizing device that magnetizes the wire rope in the longitudinal direction, the magnetizing device being arranged in an annular shape, and a search coil that detects a change in the cross sectional area of the wire rope in an inspection range magnetized by the magnetizing device, the search coil being arranged in an annular shape to surround a part of the wire rope in the longitudinal direction over the entire circumference;
• and
• a moving mechanism including rotatable support rollers respectively attached to both end portions of the portable damage detection device at equal angle intervals, the support rollers that support the wire rope from four directions around the wire rope at both the end portions, wherein
• the respective support rollers in both the end portions of the portable damage detection device are attached in such a manner that the cross sectional center of the wire rope matches with the cross sectional center of the internal space of the magnetizing device.