Rope damage diagnostic testing apparatus

  • US 10,801,999 B2
  • Filed: 04/22/2016
  • Issued: 10/13/2020
  • Est. Priority Date: 04/22/2016
  • Status: Active Grant
First Claim
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1. A rope damage diagnostic testing apparatus that detects presence or absence of damage in a wire rope around an outer circumference of which are disposed a plurality of outer layer strands, each of the outer layer strands including a plurality of outer layer wires that are disposed around an outer circumference thereof, the rope damage diagnostic testing apparatus comprising:

  • an ultrasound applicator that includes;

    a magnet that applies a direct current magnetic field to the wire rope; and

    an excitation coil that applies an alternating-current magnetic field to the wire rope,the ultrasound applicator that generates ultrasonic waves in the wire rope by making the wire rope vibrate due to magnetostriction effect; and

    a detector that includes a detecting element that detects changes in a state of propagation of the ultrasonic waves in the wire rope,wherein the excitation coil and the detecting element are disposed in a parallelogram that has as a first opposite side length extending in a longitudinal direction of the wire rope and having a length of a portion of the wire rope in which one of the outer layer strands makes one revolution around the wire rope, the parallelogram having a second opposite side length a product of a diameter and number of the outer layer wires that are included in one of the outer layer strands.

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