Periodic inspection of the hottest bearing VI

2022-09-23
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Periodic inspection of bearings (VI)

the amount of grease filled in the bearings, with 1//3 filling the internal space of the bearings as the appropriate material system. It should be reduced to 1/3 at high speed. Too much grease will increase the temperature rise

4. Selection of lubricating grease

when selecting lubricating grease according to the working temperature, the main indicators should be the drop point, oxidation stability and low temperature performance. The drop point can generally be used to evaluate the high temperature performance, and the actual working temperature of the bearing should be lower than the drop point ℃. The service temperature of synthetic grease should be lower than the drop point ℃

according to the emergence of a batch of countries with international advanced technology, which are vigorously promoting the development and transformation of the plastic recycling granulator industry in recent years, and the enterprise unit bearing load of the industry leader, when selecting grease, select grease with small penetration for heavy load. In addition to small penetration, it also has high oil film strength and extreme pressure performance when working under high pressure

when selecting grease according to environmental conditions, calcium based grease is not easily soluble in water and is suitable for dry and less moisture environments

5. Oil lubrication

under the conditions of high speed and high temperature, oil lubrication can be used when grease lubrication is no longer suitable. With the help of lubricating oil, human beings can realize the "mission cycle of exploring Mars and other planets", which can take away a lot of heat. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of oil film formed between friction surfaces. The viscosity of lubricating oil at bearing working temperature is generally CST. The higher the speed, the lower the viscosity should be selected, and the heavier the load, the higher the viscosity should be selected. Commonly used lubricating oils include machine oil, high-speed machine oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc

oil lubrication methods include:

a. oil bath lubrication

oil bath lubrication is the most common lubrication method, which is suitable for the lubrication of low and medium speed bearings. A part of the bearing is immersed in the groove, and the lubricating oil is carried by the rotating bearing parts, and then flows back to the oil groove. The oil surface should be slightly lower than the center of the lowest rolling element

b. oil dripping lubrication

oil dripping lubrication is suitable for bearing components that need a quantitative supply of lubricating oil. The amount of oil dripping is generally one drop per second. Excessive amount of oil will cause the bearing temperature to increase

c. circulating oil lubrication

use the oil pump to transfer the filtered oil to the bearing parts, and then use it after filtering and cooling the lubricating oil after passing through the bearing. Since the circulating oil can take away some heat and cool the bearing, this method is applicable to bearing components with high speed

d. spray lubrication

use dry compressed air to mix with lubricating oil through a spray to form an oil mist. In the spray bearing, the air flow can effectively cool the bearing and prevent the invasion of impurities. This method is suitable for the lubrication of high-speed and high-temperature bearing parts

e. spray lubrication

use the oil pump to inject high-pressure oil into the bearing through the nozzle, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at a high speed, the rolling element and cage also form an air flow around at a relatively high rotation speed. It is difficult to send the lubricating oil to the bearing by using the general lubrication method. At this time, the lubricating oil must be sprayed into the bearing by using the high-pressure injection method, and the position of the nozzle should be placed between the inner ring and the center of the cage

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