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. The surface of rhombic pattern rubber sheet can increase the surface friction of rubber sheet, by optimizing the friction and reducing the slippage, it improves the overall efficiency and production speed of the system. Advantage: High wear-resistant material to protect the drum, the back side comes with semi-sulfurized CN layer, so that the drum can be bonded firmly in any harsh environment, fast construction and maintenance, applicable to a variety of industrial and mining environment. Widely used in coal mines, grain silos, coal, power plants, iron and steel, metallurgy, chemical fertilizer, cement plants, chute down the mine.