Magnetic focusing sensor for simultaneous detection of multiple defects and detection system

Abstract

The invention belongs to the related technical field of a nondestructive testing technology, and discloses a magnetic focusing sensor for simultaneous detection of multiple defects and a detection system. The sensor comprises a permanent magnet, a magnetic guiding core and a sensing element, the permanent magnet is an annular magnet, a notch is formed in the lower end of the annular magnet, and the magnetic guiding core is arranged on a connecting line of the circle center of the annular magnet and the notch and used for guiding a magnetic field gathered in the center of the annular magnet to the magnetic guiding core. The magnetic guiding core is of a multi-layer sheet-shaped structure, a detection probe is arranged at the bottom of each layer of sheet-shaped structure, the detection probes are used for detecting surface appearance defects of a magnetic material to be detected, and the sensing elements are arranged on the probes of the magnetic guiding core and used for sensing changes of a magnetic field in each detection probe. According to the invention, detection and identification of the micro surface topography of the magnetic material are realized, the resolution ratio, the detection precision and the sensitivity are higher, and the method can adapt to wider processing and manufacturing environments and working conditions.

Description

technical field [0001] The invention belongs to the technical field related to non-destructive testing technology, and more specifically relates to a magnetic focus sensor and a detection system for simultaneous detection of multiple defects. Background technique [0002] The characteristics of the surface topography of metal parts directly affect the service performance, fatigue resistance and even the life of the whole part. Therefore, the detection of the surface topography of ferromagnetic materials is very important. However, in the high-precision manufacturing process of metal parts, due to the complex mechanical and physical behaviors and processes in the processing, it is difficult to improve the surface quality of ferromagnetic metal parts. The surface topography also presents various abnormal features. At present, although there are mechanical stylus method, impression method, optical interference method, etc. for the online detection and identification of ferroma...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a magnetic focus sensor and detection system for simultaneous detection of multiple defects, which overcomes the unfocused magnetization field of the traditional electromagnetic detection method, the large volume of the magnetic sensitive element, the ferromagnetic Due to limitations such as oil contamination on the surface of the material, the simultaneous detection of multiple defects and surface micro-topography is realized by sensing the active magnetic field coupling changes at the bottom of the magnetic guiding core

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