G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/72 (2006.01) G01N 27/82 (2006.01)
Patent
CA 2054718
In a magnetic inspection apparatus for a thin steel strip of the invention, a pole-to-pole distance of a magnetizer, which is housed in a hollow roller contact- ing a traveling thin steel strip to oppose the thin steel strip, is set between twice and eight times a dis- tance between magnetic poles and the thin steel strip. A position of a magnetic sensor in the travel direction of the thin steel strip is shifted from the central position of the magnetic poles to a travel direction side by a small distance. In this invention, a pair of hollow rollers are provided to sandwich upper and lower surfaces of a traveling thin steel strip, and magnetic sensors are respectively housed in the hollow rollers. As a result, a position of a defect in the direction of the thickness of the thin steel strip, and a defect size can be accurately detected. In a magnetic inspection apparatus for a thin steel strip of the invention, a magnetic detection circuit for detecting magnetic flux leakage caused by a defect in the interior or on the surface of a thin steel strip uses an over-saturation type magnetic sensor constituted by applying a detection coil around a ferromagnetic core. As a result, a defect detection sensibility and a defect detection precision are greatly improved.
Ando Seigo
Furukawa Takato
Iwanaga Kenichi
Takekoshi Atsuhisa
Takenaka Masaki
Nkk Corporation
Ridout & Maybee Llp
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