A pellet mill has two key parts. One is die. The other one is roller assembly. Therefore, it is very necessary to know its structure and function. Usually a roller assembly consists of roller shell, eccentric shaft, bearings and seals. The roller shell is the surface where raw material is pressed against die. So this part should be strong enough to withstand the stress of pelleting. There are four roller shells: tungsten carbide roller shell, corrugated roller shell, indented roller shell and coin slotted roller shell. Among them, the most popular one is the corrugated roller shell whose special design can efficiently reduce slipping during pelleting process. The eccentric pellet mill shaft is used to fix the whole roller assembly to the main body of a pellet mill.
Bearings are quite important parts and need much more care. A bearing is comparatively more fragile than other parts. This means bearing consumption could be large. So keeping a certain amount of bearing spare parts in stock is quite necessary. A seal in roller assembly plays a very important role. A good seal can keep dirt and other impurities away from bearings. Thus bearings can last longer. Checking roller assembly from time to time is always recommended. If you have already owned a pellet mill or you are going to buy one, the above information may be help to you.
Whenever you come across a problem with your pellet mill, consult an expert before doing anything unsure.