Illuminating apparatus for detecting cylinder defect

Abstract

The invention relates to an illumination device used for detecting defects of cylindrical surfaces; the illumination device is characterized by comprising a hollow cylindrical body (6) with the internal circumferential wall having a light source (4), a ring-shaped prism (1) which is coaxially arranged in the cylindrical body (6); furthermore, the cross-section of the ring-shaped prism is a right angled triangle, wherein, the external circumferential wall and the bottom edge are right angle edges and the internal circumferential wall is an inclined edge; the inclined surface of the ring-shaped prism is plated by half-transmission and half-reflection optical film. Compared with the prior art, the illumination device has the advantages that by the ring-shaped prism with the right angle triangular cross-section coaxially arranged at the internal side of the hollow cylindrical body and the optical film of half-transmission and half-reflection arranged on the inclined surface of the ring-shaped prism, the reflecting light direction of the cylinder to be detected is changed, the illumination advantage of the cylindrical light source is remained, the gaining of no-defect ring-shaped image is possible simultaneously; furthermore, the illumination device can provide the surface image of the cylinder to be detected ranging from 0 to 360 DEG for the image gaining device.

Description

technical field [0001] The invention relates to an illuminating device, and more specifically relates to an illuminating device for detecting defects on smooth cylindrical surfaces such as bearings and stainless steel pipes. Background technique [0002] For the visual lighting system used in the defect detection process of the cylindrical surface, if the ring light source is used, it can only provide uniform illumination light for the cylinder surface, and the surrounding structure of the ring light source on the cylinder surface makes the surface features of the cylinder surface difficult to detect. Obtained by the visual system; if a plane light source is used to irradiate the cylindrical surface, due to the principle of mirror reflection, the obtained cylindrical surface will have bright lines that are difficult to eliminate. [0003] The existing cylindrical surface defect detection generally adopts a cylindrical light source, which itself has a semi-cylindrical vault s...

AI Technical Summary

Problems solved by technology

The defect of the cylindrical light source of this structure is: the top of the semi-cylindrical light source of the cylindrical light source must leave an opening for the image acquisition system to collect images, and the lack of luminous objects (such as LED lights) at the opening position makes the irradiation on the measured cylindrical surface Sometimes there will be dark spots, these lighting defects will affect the subsequent picture recognition

In addition, when using a cylindrical light source with this structure to detect defects on the cylindrical surface, only half of the cylindrical image can be obtained, and the cylindrical surface far away from the linear opening is far away from the lens and at a certain angle with the lens, and the shooting results are also poor. Will affect subsequent image recognition

[0004] At present, there are still some visual lighting systems that use cylindrical prisms to detect defects on the cylindrical surface. This cylindrical prism converges the incident light. A relatively wide illumination area illuminated on the measured cylindrical surface can be obtained. The disadvantage of this type of cylindrical illumination is that the illumination area is not improved much, and the thickness range of the measured cylinder is limited by the focal length of the cylindrical prism, so the cylindrical The applicable measurement range of the surface prism is not wide

Images