The rotary drum screen is a specialized sieving machine designed for material separation based on particle size. The drum, covered with a mesh of a specified aperture, rotates at a slight incline, allowing material to progress through the screen. As the material moves forward, smaller particles pass through the mesh, while larger ones continue along the drum's length for further processing. This rotary screening machine is widely used in industries such as fertilizers, mining, and material processing due to its efficiency and capacity for handling large quantities of bulk solids.