Zero magnetic field magnetic flux leakage detection system based on magnetic shielding structure

• Main Authors: TANG XIAOHUA, XUE SONGWEN, TANG QIN, CHEN LIANG, LUO FEI, YE JIALE, ZHANG YONG, GAO BIN, JIANG SHIQIANG
• Format: Patent
• Language: Chinese; English
• Published: 22.12.2023
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; MEASURING; PHYSICS; PRINTED CIRCUITS; TESTING

The invention discloses a zero magnetic field magnetic flux leakage detection system based on a magnetic shielding structure, when the zero magnetic field magnetic flux leakage detection system scans defects of a tested piece, a mobile carrier is placed on the tested piece, then the mobile carrier is controlled to move on the tested piece at a constant speed, and in the moving process, a magnetizer magnetizes the tested piece to be saturated; at the moment, the magnetic flux of the permanent magnet is divided into two paths, one path is spread into the tested piece, the other path is spread in the air, in the spreading process of the magnetic flux in the tested piece, when the magnetic flux encounters a defect position, the magnetic conductivity at the defect position is distorted, the magnetic flux generates magnetic refraction and leaks into the air, and meanwhile, the defect position is detected along with the magnetic compression effect brought by magnetic diffusion and a background magnetic field. Finall