ROPE DAMAGE DIAGNOSTIC TESTING APPARATUS

• US 20190086369A1
• Filed: 04/22/2016
• Published: 03/21/2019
• Est. Priority Date: 04/22/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: NOGUCHI, Toyohiro, INOUE, Jin, MOCHIZUKI, Keita, SHIRATSUKI, Akihide
• Granted Patent: US 10,801,999 B2
• Time in Patent Office: Days
• CPC Class Codes: B66B 7/1215 specially adapted for ropes or cables
• CPC Class Codes: D07B 1/145 comprising elements for indicating or detecting the rope or cable status
• CPC Class Codes: G01N 2291/02827 Elastic parameters, strength or force
• CPC Class Codes: G01N 2291/044 Internal reflections (echoes), e.g. on walls or defects
• CPC Class Codes: G01N 2291/2626 Wires, bars, rods
• CPC Class Codes: G01N 29/043 in the interior, e.g. by shear waves
• CPC Class Codes: G01N 29/24 Probes transducers for acoustic waves B06B, G10K; for measuring G01H
• CPC Class Codes: G01N 29/2412 using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]; investigating the presence of flaws using eddy currents G01N27/90, magnetostrictive transducers B06B1/08, measuring magnetostrictive properties G01R33/18

Abstract

In a rope damage diagnostic testing apparatus, an ultrasound applicator generates ultrasonic waves in a wire rope by making the wire rope vibrate due to magnetostriction effect. A detecting element detects changes in a state of propagation of the ultrasonic waves in the wire rope. An excitation coil and the detecting element are disposed in a parallelogram that has as a first opposite side length a length of a portion of the wire rope in which one of the outer layer strands makes one revolution around the wire rope, and that has as 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.

Claims

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, wherein:

the rope damage diagnostic testing apparatus comprises;

an ultrasound applicator that comprises;

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 generating ultrasonic waves in the wire rope by making the wire rope vibrate due to magnetostriction effect; and

a detector that comprises a detecting element that detects changes in a state of propagation of the ultrasonic waves in the wire rope; and

the excitation coil and the detecting element are disposed in a parallelogram that has as a first opposite side length a length of a portion of the wire rope in which one of the outer layer strands makes one revolution around the wire rope, and that has as 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.

2. The rope damage diagnostic testing apparatus according to claim 1, wherein:

the magnet is an application magnet; and

the detector comprises;

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

a detecting coil that faces the wire rope, the detecting coil constituting the detecting element.

3. The rope damage diagnostic testing apparatus according to claim 2, wherein the excitation coil and the detecting coil are divided into segmented coils that are equal in number to the outer layer strands.

4. The rope damage diagnostic testing apparatus according to claim 3, wherein application and detection of ultrasonic waves is performed separately by each of the segmented coils.

5. The rope damage diagnostic testing apparatus according to claim 1, wherein reflected ultrasound waves that propagate through the wire rope are detected by the excitation coil.

6. The rope damage diagnostic testing apparatus according to claim 1, wherein the ultrasound applicator also serves as the detector by making the excitation coil also serve as the detecting element, reflected ultrasound waves that propagate through the wire rope being detected by the excitation coil.

7. The rope damage diagnostic testing apparatus according to claim 2, wherein reflected ultrasound waves that propagate through the wire rope are detected by the excitation coil.

8. The rope damage diagnostic testing apparatus according to claim 3, wherein reflected ultrasound waves that propagate through the wire rope are detected by the excitation coil.

9. The rope damage diagnostic testing apparatus according to claim 4, wherein reflected ultrasound waves that propagate through the wire rope are detected by the excitation coil.