Wire rope inspection device and wire rope inspection system

Patent metadata

Field	Value
Publication number	US-12287309-B2
Application number	US-202118019708-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Sep 10, 2020
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

A wire rope inspection device (100) is provided with a first detection coil (30) and a second detection coil (40), and a processing unit (61). The second detection coil is arranged to be inclined to the first detection coil when viewed from a direction (X-direction) perpendicular to a first direction (Z-direction) along which the first detection coil moves relative to the wire rope (W). The processing unit identifies an abnormality position of the wire rope in the first direction based on a detection signal detected by the first detection coil and identifies an area of the abnormality position of the wire rope in a cross-section based on a detection signal detected by the second detection coil.

First claim

The invention claimed is:

1. A wire rope inspection device comprising:
a plurality of detection coils each configured to move relative to a wire rope in a direction along which the wire rope extends and detect magnetic flux of the wire rope; and
a processing unit configured to acquire and process detection signals detected by the plurality of detection coils,
wherein the plurality of detection coils includes a first detection coil and a second detection coil, the first detection coil being provided along a circumference direction of the wire rope, the second detection coil being provided along the circumference direction of the wire rope and arranged to be inclined to the first detection coil when viewed from a direction perpendicular to a first direction along which the first detection coil moves relative to the wire rope, and
wherein the processing unit is configured to
identify an abnormality position of the wire rope in the first direction based on a detection signal detected by the first detection coil and
identify an area of the abnormality position of the wire rope in a cross-section of the identified abnormality position of the wire rope in the first direction, based on a detection signal detected by the second detection coil.

2. The wire rope inspection device as recited in claim 1 ,
wherein the first detection coil is configured to detect a detection signal having a peak corresponding to a detection position of the wire rope in the first direction,
wherein the second detection coil is configured to detect a detection signal having a peak corresponding to an area including a plurality of detection positions of the wire rope in a direction intersecting with the first direction, and
wherein the processing unit is configured to
identify the abnormality position of the wire rope in the first direction based on a detection time of a peak of a detection signal detected by the first detection coil and
identify the abnormality position of the wire rope in the cross-section of the identified abnormality position of the wire rope in the first direction based on a detection time of the peak of the detection signal detected by the second detection coil.

3. The wire rope inspection device as recited in claim 2 ,
wherein the processing unit is configured to identify the abnormality position of the wire rope in the cross-section of the identified abnormality position of the wire rope in the first direction, based on a magnitude of a deviation of a detection signal of the peak of the detection signal detected by the second detection coil to a detection time of the peak of the detection time detected by the first detection coil.

4. The wire rope inspection device as recited in claim 1 ,
wherein the second detection coil is arranged to be inclined to the first detection coil when viewed from an X-direction as a second direction perpendicular to a Z-direction as the first direction,
wherein the plurality of detection coils further includes a third detection coil provided along the circumferential direction of the wire rope and arranged to be inclined to the first detection coil when viewed from a Y-direction as a third direction perpendicular to the Z-direction and the X-direction, and
wherein the processing unit is configured to
identify the abnormality position of the wire rope in the Z-direction based on the detection signal detected by the first detection coil and
identify the abnormality position of the wire rope in the cross-section of the identified abnormality position of the wire rope in the first direction, based on detection signals detected by the second detection coil and the third detection coil.

5. The wire rope inspection device as recited in claim 4 ,
wherein the second detection coil is arranged to be inclined to the first detection coil and the third detection coil when viewed from the X-direction, and
wherein the third detection coil is arranged to be inclined to the first detection coil and the second detection coil when viewed from the Y-direction.

6. The wire rope inspection device as recited in claim 5 ,
wherein the first detection coil is configured to detect the detection signal having the peak corresponding to the detection position of the wire rope in the Z-direction,
wherein the second detection coil is configured to detect the detection signal having the peak corresponding to the area including the plurality of detection positions of the wire rope in the Y-direction,
wherein the third detection coil is configured to detect the detection signal having the peak corresponding to the area including the plurality of detection positions of the wire rope in the X-direction, and
wherein the processing unit is configured to
identify the position of the abnormality position of the wire rope in the Z-direction, based on the detection time of the peak of the detection signal detected by the first detection coil,
identify the position of the abnormality position of the wire rope in the Y-direction in the cross-section of the identified abnormality position of the wire rope, based on the detection time of the peak of the detection signal detected by the second detection coil, and
identify the position of the abnormality position of the wire rope in the X-direction in the cross-section of the identified abnormality position of the wire rope in the Z-direction, based on the detection time of the peak of the detection signal detected by the third detection coil.

7. The wire rope inspection device as recited in claim 4 ,
wherein the wire rope is composed of a plurality of wire ropes, and
wherein the processing unit is configured to identify the abnormality position in the cross-section of each of the plurality of wire ropes in a direction intersecting with the Z-direction, based on peaks of detection signals detected by the first detection coil, the second detection coil, and the third detection coil.

8. The wire rope inspection device as recited in claim 7 ,
wherein the first detection coil, the second detection coil, and the third detection coil are provided to each of the plurality of wire ropes.

9. The wire rope inspection device as recited in claim 8 ,
wherein each of the first detection coil, the second detection coil, and the third detection coil includes a first portion arranged in a direction perpendicular to the Z-direction and a second portion arranged to sandwich the wire rope together with the first portion on a side opposite to a side where the first portion is arranged with respect to the wire rope.

10. The wire rope inspection device as recited in claim 1 , further comprising:
an excitation unit configured to move relative to the wire rope and apply magnetic flux to the wire rope;
wherein the excitation unit is commonly provided to the plurality of detection coils.

11. The wire rope inspection device as recited in claim 10 , further comprising:
a magnetic field application unit configured to apply a magnetic field in advance to the wire rope to adjust magnitude and direction of a magnetic field of the wire rope as a magnetic body,
wherein the excitation unit is configured to apply a magnetic field generated by causing an alternating current to flow through the wire rope.

12. A wire rope inspection system comprising:
a wire rope inspection device provided with a plurality of detection coils, the plurality of detection coils each being configured to move relative to the wire rope in a direction along which the wire rope extends and detect magnetic flux of the wire rope; and
a processing device configured to acquire and process detection signals detected by the plurality of detection coils,
wherein the plurality

Assignees

• Shimadzu Corp

Inventors

• Takami Yoshio

Classifications

• B66B7/123

  by analysing magnetic variables · CPC title

• G01N27/83 Primary

  by investigating stray magnetic fields · CPC title

• G01N27/82 Primary

  for investigating the presence of flaws · CPC title