Roller covering is an important part and component of the belt conveyor transportation system. The covered roller can effectively improve the running condition of the conveyor system and protect the metal roller from wear and tear. Rhombic roller covering is a kind of pre-slotted rubber sheet, suitable for active pulley covering. There are regular rhombic blocks on the rubber sheet, which can protect the surface of the drum from adhering to the transportation materials and avoid running away. Rhombic drum rubber is mainly made of composite rubber and semi-sulfur CN layer two-layer structure by the vulcanizing machine high temperature pressing one-piece molding, which is added to the rubber plate semi-sulfur CN layer is a special production of a semi-sulfur layer, in the process of bonding with the drum and the adhesive and the adhesive to a strong cold sulfur chemical reaction to form a super adhesive effect, so that no matter the drum in any harsh environment can be maintained and the rubber plate bonding firm. It is suitable for many kinds of industrial and mining environments. Widely used in coal mines, grain silos, coal, power plants, iron and steel, metallurgy, chemical fertilizer, cement plants, chute down the mine.