In heavy industries like mining, primary and secondary scrapers are used to clean conveyor belts, each serving a distinct role. Primary scrapers, or pre-cleaners, are positioned at the head pulley where the belt discharges material. They are designed to remove the bulk of the material that adheres to the belt after it leaves the discharge point, effectively preventing large buildups. Secondary scrapers, placed further along the conveyor, follow the primary scrapers to remove any residual material that the primary scrapers may have missed. This two-stage cleaning process ensures thorough belt cleaning, reducing wear and tear, improving efficiency, and extending the life of the conveyor system.