Patent ID: 8390281
Filing Date: 2013-03-05
Classification: G01N

Abstract:
1. A wire rope flaw detector, comprising: a magnetization unit that forms a main magnetic flux in a given section in an axial direction of a wire rope; and a damage detection unit that detects a damaged portion in the given section of the wire rope, wherein the damage detection unit comprises: a detection coil that detects a leakage magnetic flux generated by the damaged portion; an exciting coil connected to an exciting power source; and a magnetic path member made of a ferromagnetic material, around which the detection coil and the exciting coil are wound, wherein the magnetic path member comprises: a bypass magnetic path member around which the detection coil is wound; and a loop magnetic path member that shares a common portion with the bypass magnetic path member, said loop magnetic path member being wound with the exciting coil, and wherein the exciting coil develops a magnetic flux when energized to modify the common portion to inversely change the amount of leakage magnetic flux in the detection coil so as to develop an induced voltage in the detection coil, to thereby detect the damaged portion.