Full definition
A secondary belt cleaner is a vital component in conveyor systems designed to enhance the cleaning efficiency of the belt after initial cleaning has occurred. Typically installed on the return strand of the conveyor, this cleaner is positioned approximately 300-600 mm downstream of the head drum and after the primary cleaner. Its primary function is to remove carryback, which refers to the material that adheres to the belt and can lead to operational inefficiencies and contamination. The design usually comprises segmented individual blades that are 100-200 mm wide, each mounted on independent spring or air-cushion mounts. This design allows the blades to conform to surface irregularities such as splice bumps or belt wander, ensuring effective cleaning across the entire width of the belt.
The materials used for the blades of secondary cleaners often include polyurethane, tungsten carbide, or ceramic segments, each chosen for their durability and wear resistance. The segmented design is particularly advantageous because it enables each blade to adjust independently to the belt's surface, maintaining consistent cleaning pressure. This feature is critical for achieving high levels of carryback removal, with secondary cleaners combined with primary systems achieving rates of 90-95% or higher. In sensitive environments, such as food or pharmaceutical industries, some systems may incorporate a tertiary cleaner, such as a belt washing system or a V-plow, to ensure near-complete cleaning.
Installation of the secondary belt cleaner is straightforward, typically bolted to the conveyor's structure at the point where the belt has exited the head drum and is running flat on the first return idler. According to the CEMA 576 standard, proper positioning is essential for optimal performance. Brands like Martin DT2/SQC2, Flexco EZP2, and ASGCO Razor-Back are well-known for their effective secondary belt cleaner solutions. In applications where spillage is unacceptable, such as in enclosed conveyors, the secondary belt cleaner plays a crucial role in maintaining operational efficiency and cleanliness.