Steel pipe inner surface magnetic powder inspection deep hole fluorescence imaging device and using method thereof

Abstract

The invention discloses a steel pipe inner surface magnetic powder inspection deep hole fluorescence imaging device and a using method thereof. The steel pipe inner surface magnetic powder inspection deep hole fluorescence imaging device comprises a magnet yoke coil arranged on one side of a steel pipe port, and the side face, facing the steel pipe port, of the magnet yoke coil is connected with a core rod and a spraying device used for spraying magnetic suspension to a detected part of a steel pipe; the core rod comprises a detection section located in the steel pipe and a reserved section located outside a port of the steel pipe, the reserved section is connected with the side face of the magnet yoke coil, and an ultraviolet reflector is arranged beside the detection section; a camera and an ultraviolet light source are arranged at the two opposite sides of the magnet yoke coil respectively, a lens of the camera faces the end opening of the steel pipe, the light-emitting face of the ultraviolet light source faces the end opening of the steel pipe, and the ultraviolet reflector corresponds to the light-emitting face of the ultraviolet light source. Under the condition of a small pipe diameter, large-depth stable excitation can be realized, and large-depth ultraviolet irradiation and fluorescence imaging can also be performed.

Description

technical field [0001] The present invention relates to steel pipe magnetic particle flaw detection technology, more specifically, relates to a steel pipe inner surface magnetic particle flaw detection deep hole fluorescence imaging device and its use method. Background technique [0002] Magnetic particle flaw detection is an important quality inspection method for steel pipe quality. In the darkroom of a specific flaw detection station, a magnetic field is applied to the tested part of the steel pipe, and then the magnetic suspension is sprayed. If the test piece has surface or shallow surface defects (cracks, pores, Non-metallic inclusions, pits, etc.) contain air or non-metallic materials, whose magnetic permeability is much smaller than that of the workpiece, resulting in a change in magnetic resistance, and a leakage magnetic field is generated on the surface of the steel pipe or at the corresponding defect site near the surface, forming a small magnetic level, and the ...

AI Technical Summary

Problems solved by technology

If the traditional circumferential magnetization method is used, it cannot cover a large pipe end depth range; if the yoke coil 7 and mandrel 8 method of magnetization strengthening equipment is used, the depth range of the pipe end is solved, but the yoke coil 7 and mandrel 8 Occupies the optical path of the inner surface of the steel pipe 2, and cannot irradiate ultraviolet light

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