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. The rubber sheet has molded regular rhombic blocks, which can protect the surface of the drum from adhering to the transport material and avoid running away. The surface of the rhombic pattern rubber sheet increases the surface friction of the rubber sheet, which optimizes the friction and reduces slippage, improving the overall efficiency of the system and production speed. The semi-sulfurized CN layer added on the back of the rubber sheet is a specially made semi-sulfurized layer with strong bonding. Widely used in coal mines, grain silos, coal, power plants, steel, metallurgy, chemical fertilizer, cement plants, chute down the mine.