The rotary screening machine plays a critical role in grading finished granules within organic and compound fertilizer production lines; it is the core screening equipment ensuring product particle size compliance and visual quality. Following granulation, drying, and cooling, materials exhibit uneven particle sizes. Precise grading by the rotary screening machine is essential to route compliant granules to packaging, return fines to the granulation process, and send oversized lumps for crushing. Screening performance directly impacts the finished product yield and material recirculation rate, thereby influencing the entire line's production capacity and energy consumption. Thanks to advantages such as high screening efficiency, minimal granule breakage, and low operating costs, the rotary screening machine has become the standard choice for the screening stage in fertilizer production lines.
Working Principle
Driven by a motor, the screen drum rotates at a constant speed while material enters the drum through the high-end inlet. Under the influence of the drum's inclination and rotation, the material is repeatedly lifted and tumbled while moving axially toward the lower end. During this process, particles smaller than the screen mesh size pass through into the collection hopper, while oversized material continues moving forward to be discharged from the outlet. Multi-layer drum configurations allow for multi-stage grading. Throughout the screening process, material maintains full contact with the screen surface, ensuring thorough separation of fine particles. Drum rotation speed and inclination angle are adjustable to accommodate varying material properties and production requirements.
Process Advantages
Precise grading ensures consistent finished particle size and high visual quality, enhancing market competitiveness.
Gentle screening action results in lower granule breakage rates compared to vibrating screens, leading to higher finished product yields.
Capable of continuous operation with uninterrupted feeding and discharging, making it ideal for high-capacity production lines.
Enclosed screening minimizes dust emissions; compatible with dust collection systems for an environmentally friendly operation.
Simple, reliable structure with few wear parts, facilitating easy maintenance.
Selection Guide
Drum diameter and length are determined by processing capacity and material characteristics; high-capacity lines require larger diameters and longer drums, while sticky or moist materials call for larger mesh sizes and shorter drums.
Mesh size is selected based on finished product specifications; typically, the final screening mesh aperture is slightly larger than the product's upper size limit. The number of drum layers is determined by grading requirements: a single-layer screen yields two material fractions, while a double-layer screen yields three. Material test data regarding screen drum rotation speed and inclination angle should be provided during the equipment selection phase to ensure the design of optimal parameters.
The screen surface material should be selected based on the abrasiveness of the material: polyurethane or woven mesh is suitable for organic fertilizer, while perforated steel plate is used for compound fertilizer. A buffer device should be installed at the feed end to prevent large material lumps from impacting the screen surface.
Model |
Barrel | Rotation Speed(r/min) | Inclination(°) | Power(kw) | Capacity(t/h) | Dimensions | Weight(t) |
|
| Diameter(mm) | Length(mm) | L× W ×H(mm) | ||||||
| GS1.0×3.0 | 1000 | 3000 | 22 | 2-2.5 | 2.2 | 1-3 | 3.5×1.3×2.2 | 1.5 |
| GS1.2×4.0 | 1200 | 4000 | 16 | 2-2.5 | 4 | 2-4 | 5.2×1.5×2.4 | 2.3 |
| GS1.2×4.5 | 1200 | 4500 | 17 | 2-2.5 | 4 | 3-5 | 5.7×1.5×2.4 | 2.5 |
| GS1.5×5.0 | 1500 | 5000 | 14 | 2-2.5 | 5.5 | 5-10 | 6.5×1.8×3.0 | 3.8 |
| GS1.6×6.0 | 1600 | 6000 | 12 | 2-2.5 | 7.5 | 6-12 | 7.5×1.9×3.1 | 4.7 |
| GS1.8×6.0 | 1800 | 6500 | 11.5 | 2-2.5 | 11 | 8-20 | 7.6×2.2×3.2 | 6 |
