Nondestructive testing device for ferromagnetic slender component based on improved coil

Abstract

The invention provides a nondestructive testing device for a ferromagnetic slender component based on an improved coil. The nondestructive testing device comprises upper and lower detection probes, wherein the two detection probes clamp the ferromagnetic slender component from top and bottom and are symmetrically arranged; and a magnet yoke, two permanent magnets and an iron core are respectively arranged on one side, close to the ferromagnetic slender component, of each detection probe, the two permanent magnets are respectively arranged at the left and right ends of the magnet yoke, the iron core is arranged on the magnet yoke and is located between the two permanent magnets, an arc-shaped protruded part is arranged at one end of the iron core, an arc-shape groove is formed in the other end of the iron core, vertical planes are respectively arranged on the left and right sides of the iron core, and the iron core is wound with an induction coil. The nondestructive testing device has the beneficial effects that the winding of the coil is simplified, meanwhile, the signal to noise ratio of a detection signal is increased, the influence caused by an extraction distance on a detection result is greatly reduced, and the difficulty caused by different sizes of the section surfaces of the coils to the analysis of the detection result is eliminated.

Description

technical field [0001] The invention relates to a non-destructive testing device, in particular to a non-destructive testing device for a ferromagnetic slender member based on an improved coil. Background technique [0002] In 1906, the world's first non-destructive testing device for steel wire ropes was born using induction coils as sensors. After more than 100 years of development, a variety of magnetic detection sensors have been born, but induction coils are still being studied in depth by scholars at home and abroad. The main detection sensors used by many famous wire rope non-destructive testing manufacturers, such as NDT Technologies of the United States, DMT of Germany, British Coal of the United Kingdom, AGH of Poland, Halec SA of France, etc. However, although the induction coil is low in cost, easy to manufacture, and durable, it has problems such as inconvenient installation and low signal-to-noise ratio of the detection signal when it is used for the detection ...

AI Technical Summary

Problems solved by technology

However, the production of clamshell coils is still relatively complicated, and hundreds or even thousands of coils are required. The signal-to-noise ratio of the detection signal is still not high, and complex signal processing circuits are required.

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