The oil mist lubrication device uses compressed air as power to atomize the oil, producing a dry oil mist with a particle size of less than 2 µ m that resembles smoke, and then transported to the lubrication area through pipelines. Before the oil mist enters the lubrication point, it needs to pass through a component called a "condensation nozzle" to turn the mist into large, moist oil particles, which are then directed towards the friction surface for lubrication. Compressed air and some tiny oil mist particles pass through sealed gaps
Or a specially designed exhaust vent is used to release the air into the atmosphere.  
Oil mist lubrication is suitable for lubricating enclosed gears, worm gears, chains, sliding plates, guide rails, and various bearings
At present, in metallurgical enterprises, oil mist lubrication devices are commonly used for large, high-speed, and heavy-duty rolling bearings (such as support roller bearings for eight roll cold rolling mills).  
Compared with other lubrication methods, oil mist lubrication has many unique advantages:
1. Oil mist can diffuse with compressed air to all friction areas that require lubrication. Can achieve good and uniform lubrication effect;  
2. Compressed air has a low specific heat and high flow rate, making it easy to carry away the heat generated by friction.  
3. Significantly reduced the consumption of lubricating oil.  
4. The structure of the thinner oil circulation lubrication system is simple and lightweight, with a small footprint, low power consumption, convenient maintenance and management, easy to achieve automatic control, and low cost;  
5. Due to the pressure exerted by oil mist, it can effectively seal and prevent external impurities, moisture, and other contaminants from entering the friction pair.  
However, oil mist lubrication also has some drawbacks, and the following points should be noted when selecting:
1. The discharged compressed air contains a small amount of floating oil particles, which pollutes the environment and is harmful to the health of operators. So it is necessary to install an exhaust and mist removal device;  
2. Not suitable for use on motor bearings. Because oil mist invading the motor winding will reduce insulation performance and shorten the service life of the motor;  
3. The transportation distance of oil mist should not be too long, generally within 30m which is more reliable, and the longest should not exceed 80m
4. Must have a compressed air system.  
Due to the aforementioned drawbacks of oil mist lubrication, its range of use is somewhat limited. But its unique advantages are incomparable to other lubrication methods. So it will be increasingly widely used in metallurgical equipment.