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Oil condition monitoring and control technology (Part 2)

(3) ferrography technology and instrument

ferrography technology is an oil analysis method that appeared in the 1970s. It uses a high gradient strong magnetic field to orderly separate the mechanical wear particles and polluting impurities contained in the lubricating oil. With the help of a microscope, the separated particles and impurities are qualitatively and quantitatively observed in terms of morphology, size, density, composition and distribution, so as to judge the wear condition of mechanical equipment and predict the failure of parts and components

advantages of Ferrography Technology:

a. it can separate a wide range of wear debris contained in lubricating oil, and has a wide range of applications

b. through qualitative observation and quantitative measurement of wear debris, we can judge the location and degree of wear. That is, it can provide more abundant fault characteristic information

1) analytical Ferrograph

separate the wear metal particles and pollution impurity particles in the oil from the oil to make Ferrograph substrate, and then under the Ferrograph microscope, the decline of the grinding inlet deposited on the substrate does not mean the decline of the utilization rate of foreign equipment. The size of the damaged particles is calculated by calculating the maximum bending stress, morphology, composition After qualitative observation and quantitative analysis of quantitative characteristics, the tribological state of monitoring equipment parts can be judged. Analytical Ferrograph is an important means to analyze the surface wear degree of friction pairs and infer the wear parts and wear mechanism

analytical instruments: duplex Ferrograph (USA), ftp-l analytical Ferrograph (domestic), tpf-l analytical Ferrograph (domestic)

2) direct reading Ferrograph

is mainly used to directly determine the concentration and size distribution of wear particles in oil samples, which can conveniently, quickly and accurately determine the relative number of large and small wear particles in oil samples, and can intuitively reflect the wear degree and intensity of friction pairs, Therefore, it can make a preliminary diagnosis of equipment status, which is a better means of equipment monitoring and fault diagnosis at present

analytical instruments: Dr Ferrograph (SOHIO), ZTP direct reading Ferrograph 'TPD direct reading Ferrograph

iv. particle counting technology

particle counting technology is an important technology to evaluate the pollution degree of solid particles in oil. The principle is to measure the particle size in the oil sample and count according to the pre selected particle size range, so as to obtain important information about particle size distribution, which is very effective in judging the degree of oil pollution

a microscope particle counting technology

filter the oil sample through the filter membrane, then dry the filter membrane, and put it under an ordinary microscope to count the number and size of contaminated particles in different size ranges. Because the shape, size and distribution of wear particles can be directly observed, the type of wear and the source of wear particles can be qualitatively understood. The technical equipment is simple, but the operation is time-consuming, the manual counting error is also large, and the reproducibility is also poor

b automatic particle counting technology

automatic particle counters use sensor technology. When particles pass by, they will output signals reflecting their size and count at the same time. It does not need to separate solid particles from the oil sample, but automatically measures and counts the particle size in the oil sample

automatic particle SMM news: recent counting instruments: hiac/royco automatic particle counter (US), coulter automatic particle counter (UK)

v Physical and chemical index analysis technology

the performance indicators of various lubricating oils should meet the product quality requirements. Only qualified lubricating oils can play a good role in the equipment. However, the quality of oil products will deteriorate due to various reasons, which is specifically reflected in the changes of multiple indicators. When this change exceeds a certain limit, the oil product will lose its performance and must be stopped and replaced in time. Otherwise, it may bring disastrous consequences to mechanical equipment. As for the oil change limit of various lubricating oils with large fluctuation of indication, there are also indicators for reference

the physical and chemical performance indexes that must be measured for lubricating oil in use include: viscosity, flash point, moisture, total acid number (tan), total base number (TBN), corrosion, insoluble matter, etc. There are standard test methods for these indicators. Physical and chemical index analysis technology is an important means to evaluate the quality of lubricating oil in use

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