Mitsubishi Electric Corporation

Kazuaki Hirota

Takashi Yoshioka

Fumitake Takahashi

Tetsuro Seki

Hiroyuki Akita

Tomokazu Hoshinoo

Masao Akashi

Takayuki Kotera

Yoshikazu Ota

Tetsuroh Seki

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.

Wire rope flaw detector

Provided is a wire rope flaw detector, which is capable of improving detection accuracy for a wire rope breakage by keeping an interval between a wire rope to be subjected to a measurement and an adjacent wire rope. The wire rope flaw detector includes: a magnetizer, which is configured to form a main magnetic path in a predetermined set interval of a wire rope in an axial direction of the wire rope; a detection coil, which is arranged in the predetermined set interval so as to be magnetically insulated from the magnetizer and is configured to detect a leakage magnetic flux generated by a damage portion of the wire rope; and position restricting mechanisms, which are configured to keep an interval between the wire rope passing through the detection coil and a wire rope adjacent to the wire rope passing through the detection coil.

Wire rope flaw detector and adjustment method therefor

The wire rope flaw detector includes: buffer members provided on both sides of the probe in an axial direction of the wire rope and between a connecting member and the probe. The connecting member is configured to connect a first and a second position regulation mechanism with each other, and is configured to guide the wire rope. The buffer members are made of a material satisfying conditions that, during running of the wire rope, a vibration frequency of the buffer members becomes lower than the vibration frequency of vibration generated by the first and the second position regulation mechanism, and have an inherent vibration frequency larger than the vibration frequency of the vibration having a largest amplitude among vibration components of the wire rope. The adjustment jig is used at an initial adjustment so that a guide groove of the probe is supported by the position regulation mechanisms without contact.

Wire rope flaw detection device and adjustment jig

Provided is a wire rope flaw detector including a magnetizer configured to form a main magnetic flux in a part of a wire rope in a longitudinal direction thereof. A plurality of search coils are configured to detect a leakage flux that occurs from a damaged part of the wire rope in a segment in which the main magnetic flux is formed. A control unit is configured to detect induced voltages generated in the plurality of search coils. Further, the control unit is configured to superimpose voltage waveforms of the plurality of search coils on one another while shifting the voltage waveforms by a time calculated based on an interval between the plurality of search coils adjacent to each other and on a relative moving speed of the wire rope with respect to the magnetizer, to thereby amplify a peak of the induced voltage.

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Tokyo, Japan

Kazuaki Hirota