Outside cross type elastic coil eddy current probe

Abstract

The invention belongs to the technical field of nondestructive detection of pipes or bars, and concretely relates to an outside cross type elastic coil eddy current probe. The outside cross type elastic coil eddy current probe comprises coils, elastic devices and a spacing rack when the probe is applied in the nondestructive detection process of a nuclear power plant fuel bar, the fuel bar is inserted into the outside cross type elastic coil eddy current probe, and the eddy current probe or the fuel bar is axially moved in the detection process to make the eddy current probe and the fuel bar relatively move in a uniform speed in order to carry out the eddy current detection of the fuel bar. Each of the coils is an annular structure, and N coils simultaneously detect the bar; the coils are respectively arranged in the N elastic devices, and each of the elastic devices is composed of a slide block, a spring and a spacing pin; the springs are used to push the slide blocks and the coils moving together with the slide blocks to move in spacing slots; and the cooperative detection of two adjacent coils is carried out in order to realize the high defect detection sensitivity of the outside cross type elastic coil eddy current probe when the fuel bar safely pass across.

Description

Technical field [0001] The invention belongs to the technical field of non-destructive testing of pipes or bars, and specifically relates to an outer-piercing elastic coil eddy current probe. Background technique [0002] Nuclear power plant fuel rods are important equipment of nuclear power plants and the first safety barrier to prevent nuclear leakage. In order to ensure the safe and stable operation of nuclear facilities, non-destructive testing of fuel rods is required. The inspection condition of fuel rods is that it can only be inspected from the outside, and it is required to be able to find defects such as cracks or wear on the surface and inner surface, and to find the position and size of the defect. Then analyze the reasons for the defects of the fuel rods, and formulate corresponding measures to avoid re-damage of the fuel assembly due to the same reason, and ensure the safety and reliability of the fuel assembly during operation. [0003] Non-destructive testing of f...

AI Technical Summary

Problems solved by technology

However, there is currently no published information on non-destructive testing of fuel rods using external coil eddy current probes

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