The three simplest detection methods for lubricating oil are: oil spot method, color discrimination method and honing method.
Oil spot method:
The oil to be inspected is evenly mixed and dropped on a white paper (preferably a filter paper) to form oil spots, and the oil spots gradually diffuse from the center outward for about 2 to 3 hours to form three concentric rings. The state of the oil can be discerned based on the color, width and shape of the three areas.
Color discrimination method:
Normal is brown and blue black. If it is milky yellow, it indicates that diesel oil or water is added to the oil and should be replaced in time. If it is dark black, it indicates that the oil has deteriorated and must be replaced in time.
Honing method:
Remove a little oil from the low shell of the oil, apply it on your fingers, and rub it with your fingers and thumb. If you feel that there is impurities in the oil or that it is not sticky like water, or even hairy or sour, the oil has deteriorated. If you can see a small shiny metal grinding on your finger after honing, it means that the engine has a serious wear part, and it also means that the oil must be replaced immediately.
1. Low temperature high speed bearing grease
At present, the equipment using INA bearings is becoming more and more refined, and the grease used for bearings must have the following properties:
(1) It has the same operating life as the bearing, prolongs the maintenance cycle, shortens downtime and improves labor productivity.
(2) Under the high speed of dn>5×105, it is necessary to ensure that the motor temperature rises low and does not lick oil, thus reducing power consumption and protecting the motor.
(3) The impurity content is controlled under certain standards to minimize the pollution of equipment noise to the environment.
(4) Guarantee the flexibility of starting and running the bearing under ultra-low temperature working conditions to ensure the minimum output power.
2. General low noise motor bearing grease
In the INA bearing industry, this grease is used in the largest amount, accounting for about 70% of the total grease. Because this type of grease uses a soft, easy-to-filter lithium soap as a thickening agent, using mineral oil as a base oil, it is easy to meet the requirements of low and medium-end bearings to reduce the vibration value. Another advantage is that it has good pumpability, whether it is mechanical fatliquoring or manual grease application.
3. High temperature long life low noise bearing grease
Greases used in high temperature and high speed environments should have the following characteristics:
(1) It does not lose at high temperature, that is, maintains a certain consistency at a temperature of about 180 ° C, and does not soften.
(2) Less grease leakage. When the grease is subjected to high-frequency repeated shearing and large centrifugal force in the bearing, the lubrication can be recirculated to the raceway in time.
(3) It has a certain mute effect. Because the fiber of high-temperature grease is generally hard, the mute performance in the bearing noise test is far less than that of lithium-based grease.
(4) These greases must have a certain high temperature service life and have good oxidation resistance at high temperatures, thus prolonging the life of INA bearings and related equipment.
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