1. The metal-free blade is fully made of polyurethane, its high strength, wear resistance and flexibility, low wearing and great smoothness make it no damage to the belt surface; 2. The I type design of the blade is suitable for belts running in two directions and works on the non-working surface of the belt based on the gravitational constant pressure. It can effectively clean materials falling on the non-working surface of the belt, reduce the material accumulated on the pulleys, prolong the service life of the pulleys and avoid belt deviation caused by material accumulated on the pulleys; 3. Splint design of the blade holder makes the blade easy to be maintained and replaced; 4. Installed on the non-working surface of the conveyor return belt; 5. Suitable for the conveyance of all kinds of materials, such as coal, coke, sinter, salt, iron ore and fertilizer, and widely applied in thermal power plants, iron and steel plants, cement plants, fertilizer plants, coking plants, coal cleaning plants, coal mines, petrochemical plants, mining, paper mills, chemical plants, terminal transfer stations and other industries.