Mitsubishi Electric Corporation

Fumitake Takahashi

Takashi Yoshioka

Kazuaki Hirota

Tetsuro Seki

Tomokazu Hoshinoo

Takayuki Kotera

Masao Akashi

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

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.

Wire rope flaw detection device

Growing community of inventors

Tokyo, Japan

Fumitake Takahashi