Square billet magnetic particle flaw detection device and method based on transient closed high-permeability shielding

By constructing a transient local high-permeability magnetic circuit, a magnetic shielding channel is formed using a magnetically conductive support base and a model high-permeability magnetic shield, solving the problem of blind spots in the end detection of small billets, achieving efficient and reliable online detection, and improving production efficiency.

CN122171660APending Publication Date: 2026-06-09ZENITH STEEL GROUP CORP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZENITH STEEL GROUP CORP CO LTD
Filing Date
2026-03-27
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies cannot effectively solve the problem of blind spots in the end inspection of small billets without affecting the continuous operation of the production line, resulting in low efficiency of manual supplementary inspection.

Method used

A billet magnetic particle inspection device employing transient closed high-permeability magnetic shielding constructs a transient local high-permeability magnetic circuit. Utilizing a magnetically supported base and a modeled high-permeability magnetic shielding body, a magnetic shielding channel is formed under the drive of an opening and closing mechanism, reshaping the longitudinal magnetic field distribution at the end and achieving high-quality end inspection.

Benefits of technology

Without interrupting the production line, it significantly improves the uniformity and intensity of the longitudinal magnetic field at the end, making the end the strongest point for detection, completely eliminating the detection blind zone, ensuring production efficiency, and with low implementation cost.

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Abstract

The present application relates to the technical field of nondestructive testing of metal materials, and particularly relates to a billet magnetic particle flaw detection device and method based on a transient closed high-permeability shielding. The device comprises: a conveying roller for conveying a billet; a magnetizing coil for magnetizing the billet conveyed by the conveying roller; a transient magnetic circuit reconstruction unit comprising a high-permeability supporting base and a profiled high-permeability shielding body which are matched with each other and located in the magnetizing coil, and an opening and closing driving mechanism connected with at least one of the high-permeability supporting base and the profiled high-permeability shielding body; and an auxiliary end identification unit comprising a spraying system for spraying a magnetic suspension to the billet and a shooting mechanism for shooting a magnetic mark formed on the billet. The present application can realize high-quality detection of the end of the billet under the premise of no pause and no speed reduction by constructing a transient local high-permeability loop and reshaping the longitudinal magnetic field distribution of the end region.
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