Quick ferrographic analysis method based on digital video

Abstract

A quick ferrographic analysis method based on digital video includes the following steps: adopting a designed flow-controllable micro-channel device and a ferrographic microscope to be integrated into a whole; enabling a diluted oil sample to pass through a micro-channel directly; acquiring a clear abrasive particle image by regulating the focal length of the ferrographic microscope; sending the moving video of abrasive particles in the micro-channel to a computer through a digital camera; directly analyzing image frames through computer software to realize accurate positioning and characteristic identification of a plurality of characteristic abrasive particles to form a characteristic library. As abrasive particles tumble in the fluid, spatial characteristics of the abrasive particles from different perspectives can be acquired through characteristic identification of different frame images; through digital video image acquisition and fast computer automatic analysis, the advantages of an off-line analysis technology and an on-line analysis technology are combined, a novel method of acquiring abrasive particle characteristics on the basis of dynamic video is proposed, and real-time, continuous, high-accuracy and efficient on-line monitoring for the abrasion condition of the equipment is realized.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of wear state and research of wear mechanism, in particular to a fast ferrography analysis method based on digital video, which is used for state monitoring and analysis of mechanical systems. Background technique [0002] Ferrography analysis, as an important means of monitoring and fault diagnosis of mechanical equipment wear status, has been developed in the industrial field for nearly 50 years, and has become a standardized technology for equipment monitoring and testing, and because it can realize direct wear mechanism analysis, it is widely used in the field of commercial analysis. be more and more widely used. [0003] The traditional ferrographic analysis technology uses a high-gradient magnetic field to separate the abrasive particles in the oil through an analytical ferrographic instrument, deposits them on the ferrographic substrate in a regular arrangement, and then obtains a clear im...

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Problems solved by technology

At the same time, this analysis method also has three disadvantages: first, the spectrum production process requires a lot of manual operations, and the quality of spectrum production depends on the experience of the operator, and the degree of automation is low; second, the analytical ferrgraph itself has no analytical ability, It is necessary to use other instruments such as ferrography microscope for analysis, which increases the cost; thirdly, because the magnetic field is used to collect abrasive particles, almost no non-magnetic abrasive particles can be collected, and the application is limited

[0005] The LNF automatic wear particle analyzer developed by the U.S. Naval Research Institute realizes automatic identification of wear particles, but only gives static images and characteristics of single-view wear particles;

[0006] Xi'an Jiaotong University researched "online monitoring ferrography instrument" (patent number: 01240347.4), "online digital image type electromagnetic permanent magnet hybrid excitation spectrum sensor" (public number: CN1673733), "a short deposition distance image type online iron Spectrum device and method" (public number: CN100365413C) and "on-line image visual ferrography non-stacking deposit wear particle concentration index monitoring method" (public number: CN102288524A) etc. have solved the problems of automatic sampling and automatic identification, but there are still two Two problems: 1) only static images are provided; 2) due to online use, the resolution is low, only fuzzy equivalent features can be given, but the precise features of individual abrasive particles cannot be given

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