Abstract
Lubricant failure or irrational lubrication is the root cause of industrial equipment failure. By monitoring the distribution of the suspended particles in lubricants, it is possible to discover hidden lubrication problems. After taking the lubricating oil samples of industrial equipment, the oil monitoring technology is used to analyze the particle size distribution and the type and content of the abrasive particles by electrical, magnetic, and optical monitoring techniques. It is necessary to separate the suspended particles in oils with impurities by some method to eliminate potential safety hazards and ensure the reuse efficiency of the lubricant. In this paper, the principles, advantages, and disadvantages of several important oil monitoring methods are described, and new developments in various methods are analyzed. Several typical methods for separation of the suspended particles in purified oils were introduced. The advantages and disadvantages of each process were summarized. The development direction of lubricant monitoring technology was pointed out, and guidance was provided for the separation and online monitoring of the suspended particles in lubricants. Finally, compared with similar review papers, this paper specifically figured out that ultrasonic separation method has the advantages of real time, high efficiency, and no pollution and has important application value for micron-scale particle separation of large precision machines.
Highlights
Lubricants are mainly used in machinery and vehicles to reduce the friction between their parts
The survey data from Shell of the United States showed that [2] about 35% of diesel engine operation failures and 38.5% of gear failures are due to wear, and almost 40% of rolling bearing failures are due to improper lubrication
With its environment-friendly characteristics, it will be widely used in a large-scale production of impurities in engine oil
Summary
Lubricants are mainly used in machinery and vehicles to reduce the friction between their parts. It reduces noise and plays a role in cooling. The degree of wear and tear of the mechanical components can be inferred by the detection and study of the particle size and composition of the particles in the lubricant to control the wear rate, extend the service life of the equipment, and avoid catastrophic accidents. Laboratory analysis can provide comprehensive information on the wear of equipment components. The test results are still relatively discrete This offline laboratory test cannot provide realtime information on the health of the machine equipment. The lag in laboratory testing information has increased the risk of accidents in operating equipment. Research shows that [3], whether it is the production of equipment parts of wear particles or other pollution-generated particles, with the size of the particles in the 20–30 μm maximum impact on the device, less than 1 μm particles have little effect on the wear and tear, and particles larger than 100 μm can be collected and removed by magnetic plug inspection
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