Grease operating standards of machinery and equipm

Grease used in accordance with operating standards of machinery and equipment:

A. Speed ratio because of the poor heat removal capacity of grease, the shaft temperature of fast bearings is very easy to rise, so grease made of low viscosity lubricating oil with large coning degree should be selected. On the contrary, the friction position of low speed operation should choose the grease with small coning degree.

B. The environment of the friction position of mechanical equipment is also closely related to the use of grease. In the wet and cold office environment or more places with water contact, in order to avoid water cleaning and water, water vapor into the grease to make the grease mildew, should choose water-soluble strong calcium base grease, lithium base grease, aluminum base grease; However, sodium base fat can not be used because of its poor wear resistance and easy to break milk. In water acid gas and other corrosive vapors are more serious places, should be used with corrosion resistant additives such as grease or hydrocarbon grease, chemical stability of hydrocarbon grease is better than soap grease. In the place where dust is relatively large, viscous grease with high purity graphite can be selected.

C. Temperature Temperature (working temperature and natural environment temperature) is a key factor when selecting grease. Liquid outflow and liquid aging caused by high temperature is the primary reason of ineffective high temperature of grease. If the temperature is close to or beyond the dripping of grease, it will lead to mildew, volatile mineral oil, oil separation and outflow of grease. At lower temperatures, the running distance of mechanical equipment is huge, and it is usually not easy to run. Therefore, the minimum application temperature of grease must be taken into account. Therefore, in the application of higher temperature, should be selected coning degree of small high temperature resistant grease. Such as sodium base fat, lithium base fat, compound calcium base or combined aluminum base fat, sodium bentonite fat, methyl silicone compound calcium base fat and so on. The application temperature of general fat should be 10 ~ 20℃ lower than that of dripping (the generation of fat should be less than 20 ~ 30℃). In ultra-low temperature (-20 ~ -60℃) operation, generally should be used for low viscosity mineral oil production of coning suitable, ultra-low temperature characteristics of grease, such as no. 2 ultra-low temperature lithium grease, grease oil - lithium grease, methyl silicone oil compound calcium grease.

D. The size of the coning degree of the load grease is associated with the working ability to bear the load when applied. A grease with a small coning degree can bear a large load than a grease with a large coning degree. Therefore, in the bearing of heavy load or impact vibration load of the friction surface, should choose small coning grease; Light load of friction surface, can be used to coning relatively large grease. Lubricating grease with extreme pressure additive should be used for friction surfaces operating under the boundary lubrication standard.