Tube column detection probe of alternative-current electromagnetic field and detection system

Abstract

The invention provides a tube column detection probe based on an alternative-current electromagnetic field. A probe shell is designed into a first main body and a second main body which can be separated; when detection is carried out, the first main body and the second main body are connected to form a tube column detection probe through a connecting part, and then the probe can be conveniently assembled and disassembled; meanwhile, the first main body and the second main body are respectively wound and wrapped by excitation coils, the lift distances of the excitation coils from a tested surface can be reduced, the intensity of sensitive current on the tested surface can be improved, and furthermore the sensitivity of the tube column detection probe can be improved. Therefore, by adoptingthe tube column detection probe based on the alternative-current electromagnetic field, the detection probe can be conveniently assembled and dissembled, detection procedures that a tube column is detected by using an alternative-current electromagnetic field detection technique are simplified, in addition, detection on tube columns of different tube diameter sizes at different parts can be achieved, meanwhile, the winding structural design of the excitation coils can be achieved, and the lift distances of the excitation coils can be effectively reduced.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a pipe string detection probe and a detection system based on an AC electromagnetic field. Background technique [0002] After the pipe string components are produced and before they are applied to the industrial site, they need to be inspected for defects, which is conducive to the timely detection of defective pipe strings and repair or removal, thus ensuring the safe work and operation of the industrial site. [0003] As a new non-destructive testing technology, AC electromagnetic field detection technology has the advantages of high detection accuracy, no need to clean the surface to be tested, and is suitable for automatic detection. It is widely used in the defect detection of pipe string components. [0004] However, in the prior art, when using AC electromagnetic field detection technology to detect pipe string components, most of the detection probes suitable for p...

AI Technical Summary

Problems solved by technology

During the detection process, if defects are found in the middle of the pipe string components or after the detection work is completed, the pipe string to be tested or the circular detection probe needs to be pulled out, which increases the detection process; and the pipe with flange seal When testing the column, it is necessary to disassemble the flange parts and stop the operation of the column, so that the in-service detection cannot be realized; moreover, since the diameter of the circular detection probe is fixed, the The detection cannot be realized, and the application range of the AC electromagnetic field is reduced. Even if it is detected, it is necessary to cut the measured part of the pipe string, so that the cut and separated measured part is applied to the integrated circular detection probe in the prior art. Increased detection cost

Moreover, the excitation coil of the traditional AC electromagnetic field detection probe is wound on the outer surface of the probe shell, so that the distance between the excitation coil and the surface of the pipe under test is at least one thickness of the probe shell, and the lifting distance is relatively large, so the surface induced current of the pipe under test is small. Poor detection sensitivity

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