In general, due to the influence of operating environment in industrial use, when using lubricating oil, mobile machines often work abnormally due to the quality of oil products and environmental reasons, which requires mobile screw machines to put forward requirements for lubricating oil:
1. The volume of movable screw and tank is small, the amount of lubricating oil is small, and the oil temperature is high when working, which requires that the lubricating oil has good thermal stability and oxidation resistance.
2. Because of the harsh outdoor environment, the pollution of coal dust, stone dust, water and other impurities on lubricating oil is inevitable, so the lubricating oil is required to have good anti-rust, anti-corrosion and anti-emulsification properties; when the lubricating oil is polluted, its performance changes little, that is, the sensitivity to pollution should be small;
3. The temperature of the machine outdoors varies greatly in summer and winter, and the temperature difference between day and night in some areas is also large. Therefore, it is required that the viscosity of lubricating oil varies little with temperature. It is necessary not only to avoid high temperature and low oil viscosity, but also to avoid the formation of lubrication film, which should not play a role in lubrication, and to avoid the high viscosity when the temperature is too high, which makes the start-up and operation difficult.
4. For some mobile screw machines, especially in environments prone to fire and explosion accidents, it is necessary to use good flame retardant lubricants instead of flammable mineral oil.
5. Require lubricating oil to have good adaptability to the seal, so as not to cause damage to the seal.
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