Rotary Trommel Screen: A Versatile Screening Solution
A rotary trommel screen, often simply referred to as a trommel screen, is a mechanical screening machine commonly employed in waste separation plants. It efficiently separates materials based on particle size, offering high precision.
The cylindrical drum of the trommel screen is typically divided into multiple sections, each tailored to specific screening requirements. The mesh sizes within each section are uniform, increasing progressively from the smallest to the largest along the drum's length.
Primary Applications of Trommel Screens
Trommel screens are primarily used for:
Broken Bag Separation and Sorting: Efficiently separating and sorting materials from damaged bags.
Organic-Inorganic Separation: Distinguishing between organic matter (e.g., food waste, soil) and inorganic matter (e.g., plastics, glass, metal) based on particle size.
How a Rotary Trommel Screen Works
A rotary trommel screen operates on a simple yet effective principle:
1. Inclined Rotation: The cylindrical barrel is inclined and mounted on a frame. It's connected to a motor, which drives its rotation around its axis.
2. Material Feeding: Materials are fed into the rotating barrel.
3. Screening Process: As the barrel rotates, the materials tumble and roll across the screen surface.
4 Size Separation:
Undersize Material: Particles smaller than the screen openings pass through the mesh and are discharged from the outlet at the rear end of the barrel.
Oversize Material: Larger particles that cannot pass through the mesh are retained and discharged from the open end of the barrel.
Self-Cleaning Mechanism: The tumbling and rolling action of the materials help prevent clogging of the screen mesh.
By efficiently separating materials based on size, rotary trommel screens play a crucial role in various industries, including mining, recycling, and waste management.
Feeding and Discharging Size
A rotary trommel screen is designed to handle materials with a particle size range of 50 to 150 millimeters. The screen can effectively separate these materials into two primary fractions:
Oversize Material: Particles larger than the specified screen opening, typically exceeding 100 millimeters.
Undersize Material: Particles smaller than the screen opening, ranging from 100 millimeters down to as fine as 3 millimeters.
By controlling the screen mesh size and the inclination angle of the drum, the trommel screen can accurately separate materials within this size range, making it a versatile tool for various industrial applications.
Trommel Screen Capacity
The capacity of a trommel screen is directly influenced by the size of the screen openings. For example:
Fine Screening: A 2mm screen can process materials at a rate of 12-35 cubic meters per hour (19.2-56 metric tons per hour).
Coarse Screening: A larger 30mm screen can handle significantly higher throughput, reaching up to 175 cubic meters per hour (280 metric tons per hour).
This scalability allows trommel screens to accommodate a wide range of applications, including large-scale waste sorting operations.
Leftover Foods
Soil Residue
Plastic
Rubber