Non-contact detection system of hollow cylindrical part and detection method thereof

Abstract

The invention provides a non-contact detection system of a hollow cylindrical part and a detection method thereof. The detection system comprises: an illumination part, a transmission part and a data receiving processing part, wherein the illumination part comprises a dual parallel light source and a slide way with a bracket and a base; the transmission part comprises a controller and an electriccontrol translational platform; and the data receiving processing part comprises a linear array CCD and a computer with a bracket and a base. One side of the electric control translational platform is provided with the slide way; the parallel light source and the CCD are respectively arranged on the slide way by the bases thereof; the dual light source is symmetrically positioned relative to the CCD in x direction, and slantwise irradiated on the surface of a part A to be tested from the left upper direction and the right upper direction with angle Theta0<->; the width of the slit of the light source is adjusted according to the width upper limit d0<->; the CCD receives the reflected light of the surface of the part from the upper direction; and the data is transmitted to the computer to be processed. The detection method comprises the steps of: harmoniously controlling the translational platform and the CCD by the computer to equidistantly distantly acquire the data; preprocessing the acquired line image and conducting edge extracting; and fitting the circle center position and the circle radius of the outer circle with the circle center position and the circle radius of the inner circle, thus calculating the concentricity of the outer circle and the inner circle.

Description

Technical field [0001] The invention relates to automatic detection and visual non-contact detection, in particular to a non-contact detection system and a detection method for hollow cylindrical parts. Background technique [0002] Since the 1980s, machine vision has become a global research hotspot. At that time, visual inspection systems have been widely used in the American manufacturing industry, mainly in various automated inspection fields. In recent years, as industrial technology has made great progress in new materials, new processes, and new equipment, the technology has achieved vigorous development, new concepts and new theories have continuously emerged, and higher requirements have been placed on product detection technology. The traditional contact detection method is slow, and it is easy to cause damage to the parts, which will reduce the measurement accuracy. The measurement technology based on computer vision has the advantages of high speed, good real-time pe...

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