Low-frequency array eddy probe

Abstract

The invention relates to a low-frequency array eddy probe, which is characterized in that two sides of the bottom plate of a shell are provided with guiding rubber wheels; in the shell, a plurality ofdetection coils are evenly distributed along the arc-shaped circumference of the same radial section on the bottom plate; the outer part of the detection coils is sheathed with a magnetic tank used for eliminating space scattering leakage magnetic flux; an excitation coil is arranged in the shell on the outer side of the magnetic tank; a shielding coil used for focusing a magnetic circuit is arranged between the excitation coil and the detection coils; an amplifier is arranged in the shell; a probe socket is arranged out of the shell; the output end of each detection coil is respectively connected with the input end of the amplifier. Through the magnetic shielding technology of the magnetic tank and the shielding coil, the interference of the space scattering leakage magnetic flux is eliminated, defect resolving ability is improved, eight detection coils are respectively subjected to independent imaging in a detection process, in addition, detection sensitivity is always kept consistent, defect omission is avoided, the inner wall defect of a heated surface steel pipe covered by a probe can be detected through one-time operation, and reciprocating operations are not required.

Description

technical field [0001] The invention relates to the field of detection equipment for corrosion defects on the inner wall of a heating surface of a power station boiler, in particular to a low-frequency array eddy current probe. Background technique [0002] At present, the known detection of corrosion defects on the inner wall of the heating surface of power plant boilers mostly adopts the method of ultrasonic thickness measurement or ultrasonic flaw detection and low-frequency eddy current detection. However, the former two methods require descaling, smearing of couplant and other processes before on-site measurement, which limits the measurement efficiency. However, the positions of defects such as oxygen corrosion and hydrogen corrosion on the inner wall of the pipe are often irregular. Ultrasonic testing methods are effective for regular local damage such as blowing erosion and erosion of known media. However, for unknown parts, it is often used The method of random spot...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a low-frequency array eddy current probe, which can effectively solve the problem of batch detection of corrosion defects on the inner wall of the heating surface tube

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