Wire rope flaw detector

{
  "publication_number": "US11117785B2",
  "country": "US",
  "kind": "B2",
  "title": "Wire rope flaw detector",
  "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.",
  "claims": [
    "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."
  ],
  "description_excerpt": "The present invention relates to a wire rope flaw detector configured to detect damage of a rope such as a wire rope to be used for, for example, an elevator, a hoist, and a crane.\n\nAs a related-art wire rope flaw detector, there is exemplified a wire rope flaw detector including magnetizing means, a magnetic sensor, and a cover (see, for example, Patent Literature 1). The magnetizing means is configured to magnetize a wire rope in an axial direction of the wire rope. The magnetic sensor is arranged in the vicinity of a part of the wire rope, which is to be magnetized by the magnetizing means, and is configured to detect a leakage magnetic flux leaking from a damaged portion formed in the part of the wire rope. The cover is configured to protect the magnetic sensor from the wire rope.\n\nThe above-mentioned related-art wire rope flaw detector, which includes the magnetizing means, the magnetic sensor, and the cover, can detect a disconnected part of the wire rope passing therethrough. In order to improve disconnection detection accuracy, however, the magnetizing means is required to generate a sufficient magnetic flux to magnetically saturate the wire rope passing therethrough. At the same time, the magnetic sensor is required to be arranged as close as possible to the wire rope.\n\nIn a case in which the wire rope is not magnetically saturated, even when the wire rope has the disconnected part, the leakage magnetic flux generated from the wire rope is small. As a result, it becomes difficult to reliably detect the disconnected part with use of the magnetic sensor.",
  "cpc": [
    "B66B 7/123",
    "B66B 7/12",
    "B66C 15/00",
    "B66C 23/88",
    "B66D 1/54",
    "G01N 27/83"
  ],
  "ipc": [
    "B66B 7/12",
    "B66C 15/00",
    "B66C 23/88",
    "B66D 1/54",
    "G01N 27/83"
  ],
  "assignees": [
    "Mitsubishi Electric Corp"
  ],
  "inventors": [
    "Kazuaki Hirota",
    "Takashi Yoshioka",
    "Fumitake Takahashi",
    "Tetsuroh Seki"
  ],
  "filing_date": "2017-10-02",
  "publication_date": "2021-09-14",
  "grant_date": "2021-09-14",
  "priority_date": "2016-12-13",
  "application_number": "US-201716465419-A",
  "family_id": "62558440",
  "cited_by_count": 4,
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}