Coupler-free rotating eddy current detection device and method

Abstract

The invention discloses a coupler-free rotating eddy current detection device and a coupler-free rotating eddy current detection method. The detection device adopts a rotatable design of a bias magnetic core, a rotation control mechanism controls a rotating magnetic core block to rotate against the inner surface of a coil winding framework by taking the axis of the coil winding framework as a rotating shaft to form a rotating alternating magnetic field local convergence enhancement point on the inner peripheral surface of an eddy current detecting coil, and a detected workpiece can pass through the eddy current detecting coil at a uniform speed, so that the rotating scanning work of the detected workpiece can be realized without a complicated circuit coupling device, thus not only ensuringa high-sensitivity detection effect, but also reducing the detection equipment cost.

Description

technical field [0001] The invention relates to a non-destructive testing device and method, in particular to a coupler-free rotating eddy current testing device and method. Background technique [0002] For the surface longitudinal defects in the metallurgical defects of metal tubes, rods and wires, the rotating eddy current detection method is usually used at present, and the detection accuracy and detection efficiency are high. The rotating eddy current detection equipment using the probe rotation method has many technical difficulties to be solved, so its equipment The production cost is high, and the circuit coupling problem of the rotating probe is one of the major difficulties. At present, couplers such as slip rings are used to realize the coupling of the circuit, but the couplers such as slip rings have short service life due to their structural and technological problems. Frequently be replaced and maintained. Contents of the invention [0003] The purpose of th...

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