Floating oil seal is a special type of mechanical seal. It is a compact mechanical seal developed to adapt to the harsh working environment. It has the advantages of strong anti pollution ability, wear resistance, impact resistance, reliable operation, automatic compensation for end face wear, simple structure and so on. It is most widely used in engineering machinery products, and is also widely used in various conveyors, sand treatment equipment and concrete equipment. In coal mining machinery, it is mainly used for sprocket and reducer of scraper conveyor, as well as transmission mechanism, rocker arm and drum of shearer.