Nondestructive testing method and device for detecting and distinguishing internal defect and external defect of wire rope

US11703477B2 · kind B2 · utility

Assignee

• HARBN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION) · CN

Inventors

• Dong Zhang · Shangba, CN
• En Chao Zhang · Lo Wu, CN
• Wei Gao · Shanghai, CN
• Xiao YAN · Nanjing, CN
• Shi PAN · Lo Wu, CN

Key dates

• Filing date: Mar 17, 2021
• Grant date: Jul 18, 2023
• Expiry date: Aug 24, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G06N3/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A nondestructive testing method for detecting and distinguishing internal and external defects of a wire rope includes: acquiring a magnetic flux signal and a MFL signal of a detected wire rope; preprocessing the magnetic flux signal and the MFL signal of the detected wire rope; comparing a preprocessed magnetic flux signal and a preprocessed MFL signal with a preset magnetic flux signal threshold and a preset MFL signal threshold respectively, and calculating a defect position; extracting a magnetic flux signal of a defect and an MFL signal of the defect based on the defect position; calculating a defect width of the detected wire rope based on the magnetic flux signal of the defect and the MFL signal of the defect; calculating a defect cross-sectional area loss of the detected wire rope based on the defect width; and determining whether the defect is the internal defect or the external defect.