An electromagnetic nondestructive testing device for rotating metal components based on moving eddy currents

Abstract

The invention discloses an electromagnetic non-destructive testing device for rotating metal components based on moving eddy currents, which includes: a rotating platform on which the rotating metal components are fixed, a governor, a probe with an excitation coil and a magnetic sensor, a fixture, a power supply, and signal conditioning Circuits, data acquisition cards and computers, rotating platforms including motors, shafts, rotating metal components, couplings, bearings, bearing housings, motor supports and foundation plates, fixtures including bases, connectors, crossbars, chucks and locks The base is provided with a rod body for the connecting piece to move up and down, and the locking piece is a bolt; this device can perform fast and accurate quantitative non-destructive testing on defects in fast-rotating metal components such as steam turbine rotors and gear shafts, effectively improving The detection efficiency of rotating metal component defects is improved, and the rapid quantitative identification of rotating metal component defects is realized.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of objects, in particular to an electromagnetic non-destructive detection device for rotating metal components based on moving eddy currents. Background technique [0002] Nondestructive Testing (Nondestructive Testing, NDT) is an applied technical science based on modern science and technology. It uses physical methods to detect the physical properties, state characteristics and Internal structure, check whether there are discontinuities (ie defects) inside the object, so as to judge whether the tested object is qualified, and then evaluate its applicability. Electromagnetic nondestructive testing is an important branch of nondestructive testing technology, which uses the change of electromagnetic properties of materials under the action of electromagnetic fields to detect defects in materials. Therefore, electromagnetic nondestructive testing technology is widely used in the d...

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Problems solved by technology

[0004] ①Ultrasonic testing: couplant is required, which limits the improvement of testing speed. At the same time, ultrasonic testing has certain difficulties in the quantitative detection of surface and sub-surface defects of metal components;

[0005] ②Eddy current testing: The eddy current testing in the moving state is greatly affected by the lift-off factor, and the detection of internal defects of metal components cannot be realized due to the skin effect;

[0006] ③ Magnetic flux leakage detection: It is only suitable for defect detection of ferromagnetic metal components. At the same time, due to the magnetization hysteresis effect, the magnetization of metal components is not complete during high-speed inspection, which affects the quantitative identification of defects.

[0010] ①The movement track of the device is a straight line, and due to the limitation of the structure of the device, it can only detect defects in moving metal pipes, but it is difficult to detect defects in rotating metal components

[0011] ②Because the device adopts the "V" type wheel conveying device to push forward and transport the metal pipe to be detected in a straight line, which limits the further improvement of the detection speed

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