Roller running environment generally wet, dusty, and some even in extreme environments to run, in the case of its high-speed operation, due to the presence of internal friction, would inevitably lead to an internal temperature of roller, roller internal lubrication fat bubble, leading roller inside the seal chamber pressure rises. When the belt stops running, stop running roller, roller internal temperature decreases, the internal pressure is also reduced, resulting suction effect. With the roller inhaled gas, a lot of dust has been inhaled roller bearings inside the sealed chamber, causing the grease particles and mixed hardening, increased bearing wear and greatly reduce the life of the roller.

Therefore we can say, the seal structure and lubrication oil-cooled electric drum bearing directly affect the life and running resistance of idlers.

Seal bearing structure There are three main forms: a labyrinth, with contact seals (oil seals, piston ring seal, mechanical seals), seal combined.

Labyrinth seals adapt to high temperatures, seven water ferrous sulfate high pressure, high speed frequency of occasions, running resistance, dustproof performance, but poor water resistance. When the roller operate at low temperatures, the rotational resistance is greatly improved, attention should be used in low-temperature region. Contact sealing effect than the non-contact (floating ring seals, labyrinth seals, centrifugal seal, spiral seal, start seals, hydraulic seals, magnetic fluid seal) is good, but running resistance is large. Combined seal-tight manner is a hybrid combining the advantages of the first two-tight manner.