Patent ID: 8164329
Filing Date: 2012-04-24
Classification: G01N

Abstract:
1. A wire rope flaw detector comprising: a magnetizer forming a main magnetic path in a predetermined segment, in an axial direction, of a wire rope; a magnetic path member disposed around the predetermined segment so as to be magnetically insulated from the magnetizer, for causing leakage magnetic flux generated from a damaged portion of the wire rope to detour around the wire rope; and a detection coil wound around the magnetic path member, for detecting the leakage magnetic flux, wherein the magnetic path member is made of a ferromagnetic material, and has (i) at least two contact surfaces adjoining an outer perimeter of the wire rope directly or through a non-magnetic material interposed therebetween, (ii) a portion other than the contact surfaces, the portion being positioned distant from the outer perimeter of the wire rope as compared to the contact surfaces, and (iii) a space which is positioned between the portion other than the contact surfaces and the wire rope and into which a portion of the detection coil is inserted, and a length of the space in the axial direction of the wire rope is longer than a length of an opening, in the axial direction of the wire rope, between the at least two contact surfaces.