Thread surface defect recognition device and method for bolt hole and image processing method

A technology for thread surface and defect identification, applied in measuring devices, optical testing flaws/defects, instruments, etc., can solve the problem of high exposure dose at the working position, and achieve the effect of increasing the shooting distance, increasing the service life, and reducing distortion.

Pending Publication Date: 2020-09-04
CHINA NUCLEAR POWER OPERATION TECH +1
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Problems solved by technology

At the same time, due to the limitation of the bolt hole structure of the reactor pressure vessel, some parts cannot be directly inspected visually, and the radiation dose at the working position is high. Therefore, how to obtain the thread image of the bolt hole of the reactor pressure vessel efficiently, accurately and completely during the overhaul of the nuclear power plant has become an important issue. Problems to be solved

Method used

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  • Thread surface defect recognition device and method for bolt hole and image processing method
  • Thread surface defect recognition device and method for bolt hole and image processing method
  • Thread surface defect recognition device and method for bolt hole and image processing method

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] figure 1 It is a partial sectional view of a threaded surface defect identification device for a bolt hole according to an exemplary embodiment. Such as figure 1As shown, the threaded surface defect identification device for bolt holes may include: a linear camera 7 , a light source 8 , a flat mirror 11 and a housing 2 .

[0055] In the embodiment of the present disclosure, the photosensitive elements of the photosensitive surface of the image sensor of the linear camera may be arranged in a linear manner. The light source may be, for example, an LED (Light Emitting Diode, Light Emitting Diode) and other components capable of emitting light. The light source may be, for example, a strip shape. The embodiment of the present disclosure does not limit the type and shape of the light source.

[0056] As an example of this embodi...

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Abstract

The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a thread surface defect recognition device and method for bolt hole and an image processing method. According to the thread surface defect recognition device for the bolt hole, the linear camera is used for collecting images, wherein only one column of thread images is scanned once, so that cylindrical distortion generated in a cylindrical curved surface structure identification process can be effectively reduced; moreover, according to the embodiment of the invention, through the structure of the light source, the plane mirror and the plane lens, the shooting object distance of the linear camera can be effectively increased, the object distance of the linear camera during each shooting can be kept consistent, and distortion generated by acquired images can be further effectively reduced. Besides, the outer cover can effectively prevent sundries or liquid from polluting the linear camera, the light source and the plane mirror, so that the service life of the device is effectively prolonged, and noise points of shot images are further reduced.

Description

technical field [0001] The invention belongs to the technical field of nuclear power maintenance, and in particular relates to a thread surface defect recognition device, method and image processing method of a bolt hole. Background technique [0002] The video inspection of the bolt holes of the reactor pressure vessel is a necessary work during the overhaul of the nuclear power plant. The purpose is to check whether the threads are defective, rusted, and adhered to impurities, provide a basis for the maintenance and repair of the bolt holes, and create conditions for the smooth screwing in and out of the main bolts. In order to avoid bolt seizure. At the same time, due to the limitation of the bolt hole structure of the reactor pressure vessel, some parts cannot be directly inspected visually, and the radiation dose at the working position is high. Therefore, how to obtain the thread image of the bolt hole of the reactor pressure vessel efficiently, accurately and complete...

Claims

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Application Information

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IPC IPC(8): G01N21/95G21C17/003
CPCG01N21/8806G01N21/8851G01N21/95G01N2021/8887G21C17/003Y02E30/30
Inventor 蒋兴福李莉
Owner CHINA NUCLEAR POWER OPERATION TECH
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