Wire rope flaw detector

Patent metadata

Field	Value
Publication number	US-11117785-B2
Application number	US-201716465419-A
Country	US
Kind code	B2
Filing date	Oct 2, 2017
Priority date	Dec 13, 2016
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

Provided is a wire rope flaw detector according to the present invention includes a magnetizer configured to form a magnetic path in a predetermined segment of a wire rope, a magnetic sensor configured to detect a leakage magnetic flux generated from the wire rope, and a protective cover configured to prevent the wire rope from being brought into contact with the magnetic sensor. The wire rope flaw detector further includes a magnetic sensor protecting member configured to prevent the protective cover from being brought into contact with an upper face of the magnetic sensor so as to prevent application of a pressure equal to or larger than a predetermined pressure to the magnetic sensor.

First claim

The invention claimed is:

1. A wire rope flaw detector configured to detect damage of a wire rope, comprising:
a magnetizer configured to form a magnetic path in a predetermined segment of the wire rope;
a magnetic sensor, which is arranged so as to be magnetically insulated from the magnetizer, and is configured to detect a leakage magnetic flux generated from the magnetic path formed in the wire rope;
a protective cover, which is provided between the magnetic sensor and the wire rope, has a groove for allowing the wire rope to pass therethrough, and has one face that is located on a side opposite to another face on a side on which the wire rope passes, the one face having a part maintained at such a position that the part of the one face is opposed to an upper face of the magnetic sensor; and
a magnetic sensor protecting member which is provided on the lower face side of the protective cover and which has a thickness such that a pressure applied from the protective cover to the magnetic sensor is less than a predetermined value,
wherein a gap between the protective cover and the magnetic sensor protecting member is smaller than a gap between the protective cover and the magnetic sensor and is a positive value,
wherein the protective cover is configured to be first brought into direct contact with the magnetic sensor protecting member before pressing the magnetic sensor when the protective cover is deformed.

2. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member comprises first and second magnetic sensor protecting members arranged at least at one position on each of two sides of the magnetic sensor in an axial direction of the wire rope.

3. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member is arranged in a clearance inside the magnetic sensor in an axial direction of the wire rope.

4. The wire rope flaw detector according to claim 2 , wherein the magnetic sensor protecting member is arranged in a clearance inside the magnetic sensor in an axial direction of the wire rope.

5. The wire rope flaw detector according to claim 1 , further comprising a support base, which is magnetically insulated from the magnetizer, and on which the magnetic sensor is arranged,
wherein the magnetic sensor protecting member is arranged on the support base.

6. The wire rope flaw detector according to claim 2 , further comprising a support base, which is magnetically insulated from the magnetizer, and on which the magnetic sensor is arranged,
wherein the magnetic sensor protecting member is arranged on the support base.

7. The wire rope flaw detector according to claim 3 , further comprising a support base, which is magnetically insulated from the magnetizer, and on which the magnetic sensor is arranged,
wherein the magnetic sensor protecting member is arranged on the support base.

8. The wire rope flaw detector according to claim 4 , further comprising a support base, which is magnetically insulated from the magnetizer, and on which the magnetic sensor is arranged,
wherein the magnetic sensor protecting member is arranged on the support base.

9. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member is arranged in the magnetizer.

10. The wire rope flaw detector according to claim 2 , wherein the magnetic sensor protecting member is arranged in the magnetizer.

11. The wire rope flaw detector according to claim 3 , wherein the magnetic sensor protecting member is arranged in the magnetizer.

12. The wire rope flaw detector according to claim 4 , wherein the magnetic sensor protecting member is arranged in the magnetizer.

13. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member is arranged in the protective cover.

14. The wire rope flaw detector according to claim 2 , wherein the magnetic sensor protecting member is arranged in the protective cover.

15. The wire rope flaw detector according to claim 3 , wherein the magnetic sensor protecting member is arranged in the protective cover.

16. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member is made of a non-magnetic metal material.

17. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member is made of a resin material.

18. The wire rope flaw detector according to claim 1 , wherein the magnetic sensor protecting member is made of a magnetic substance.

19. The wire rope flaw detector according to claim 1 , further comprising guide blocks fixed at each end of the magnetizer in an axial direction of the wire rope,
wherein both ends of the protective cover are fixed to the guide block, and
wherein the magnetic sensor protection member is provided in the axial direction of the wire rope, between the two ends of the magnetizer to which the guide block is fixed.

20. A wire rope flaw detector configured to detect damage of a wire rope, comprising:
a magnetizer configured to form a magnetic path in a predetermined segment of the wire rope;
a magnetic sensor, which is arranged so as to be magnetically insulated from the magnetizer, and is configured to detect a leakage magnetic flux generated from the magnetic path formed in the wire rope;
a protective cover, which is provided between the magnetic sensor and the wire rope, has a groove for allowing the wire rope to pass therethrough, and has one face that is located on a side opposite to another face on a side on which the wire rope passes, the one face having a part maintained at such a position that the part of the one face is opposed to an upper face of the magnetic sensor; and
a magnetic sensor protecting member which is provided on the lower face side of the protective cover and which has a thickness such that a pressure applied from the protective cover to the magnetic sensor is less than a predetermined value, and
a support base, which is magnetically insulated from the magnetizer, and on which the magnetic sensor is arranged,
wherein a gap between the support base and the magnetic sensor protecting member is smaller than a gap between the protective cover and the magnetic sensor and is a positive value,
wherein the magnetic sensor protecting member is configured to be first brought into direct contact with the support base before pressing the magnetic sensor when the protective cover is deformed.

Assignees

• Mitsubishi Electric Corp

Inventors

• Hirota Kazuaki
• Yoshioka Takashi
• Takahashi Fumitake
• Seki Tetsuroh

Classifications

• B66B7/123 Primary

  by analysing magnetic variables · CPC title

• B66C15/00

  Safety gear (for rope, cable, or chain winding mechanisms B66D1/54) · CPC title

• B66C23/88

  Safety gear (for cranes in general B66C15/00; for rope, cable, or chain winding mechanisms B66D1/54) · CPC title

• G01N27/83 Primary

  by investigating stray magnetic fields · CPC title

• B66B7/12

  Checking, lubricating, or cleaning means for ropes, cables or guides · CPC title