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Micro-magnetic nondestructive testing sensors suitable for concave curved surface

A non-destructive testing and sensor technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of difficult detection of micro-magnetic sensors

Pending Publication Date: 2021-07-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inner cylindrical surface and the tooth profile surface of the hyperbolic spiral bevel gear have concave surface features, which are difficult to detect with traditional micro-magnetic sensors

Method used

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  • Micro-magnetic nondestructive testing sensors suitable for concave curved surface
  • Micro-magnetic nondestructive testing sensors suitable for concave curved surface
  • Micro-magnetic nondestructive testing sensors suitable for concave curved surface

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Embodiment Construction

[0016] According to the above invention content, the spur gear tooth profile surface micro-magnetic non-destructive testing sensor can provide the following implementation methods.

[0017] According to the shape of the spur gear tooth profile and the detection space of the test piece, the excitation part of the yoke and the placement position of the detection element are improved. The sensor can extract the magnetic signal from the concave curved test piece by means of U-shaped yoke side inclined plane excitation, and the design of the local boss and the horn-shaped yoke can make the sensor fit better with the test piece.

[0018] The present invention will be further described below in conjunction with the accompanying drawings and the following embodiments, and the specific implementation examples provided below are only descriptive, not restrictive, and cannot be used to limit the protection scope of the present invention.

[0019] figure 1 For the schematic diagram of se...

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Abstract

The invention discloses micro-magnetic nondestructive testing sensors suitable for a concave curved surface. The micro-magnetic nondestructive testing sensors are used for acquiring micro-magnetic signals of a material with the concave curved surface. Each of two sensors is composed of a U-shaped electromagnet, a Hall element, a double-strand winding coil, a conditioning circuit board and a shell, but the shape of a magnetic core in the U-shaped electromagnet and the coupling mode of the tail end of the magnetic core and a curved surface are different. The magnetic core of the sensor suitable for the inner cylindrical surface has an ox horn shape, and the tail end of the magnetic core is coupled with a to-be-measured curved surface in a line contact mode. The magnetic core of the sensor suitable for the complex concave curved surface has a local boss shape, and the top of the boss is coupled with the curved surface to be measured in a line contact mode. Both sensors can measure tangential magnetic field intensity, magnetic Barkhausen noise, multi-frequency eddy current and incremental permeability signals in a material with the concave curved surface.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection, and in particular relates to a micro-magnetic non-destructive detection sensor suitable for concave curved surfaces, which can be applied to the detection of inner cylindrical surfaces and tooth profile surfaces of hyperbolic spiral bevel gears. Background technique [0002] Micromagnetic signals can be used to indirectly reflect the mechanical properties of ferromagnetic materials, but the current sensors are mostly aimed at flat specimens. The inner cylindrical surface and the tooth profile surface of the hyperbolic spiral bevel gear have concave surface characteristics, which are difficult to detect with traditional micro-magnetic sensors. The patent of the present invention discloses two types of micro-magnetic non-destructive detection sensors suitable for concave curved surfaces. By adopting different shapes of yokes and magnetic field coupling methods, they are respective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/72G01N27/80
CPCG01N27/72G01N27/725G01N27/80
Inventor 何存富高兆祥刘秀成
Owner BEIJING UNIV OF TECH
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