Working Principle
The machine operates based on the principle of specific gravity (density) difference. It combines two main forces:
- Vibration: A vibrating, slightly inclined deck (screen) causes the product to stratify. The heavier particles (stones) sink to the bottom, while the lighter particles (good product) rise to the top.
- Air Flow: Air is blown up through the mesh screen from below, creating a “fluidized bed” effect. This air suspension lifts the lighter, usable material, enhancing the stratification process.
Due to the combined effect of vibration and air current:
- The lighter product (e.g., rice or wheat) flows downslope along the incline of the screen.
- The heavier materials (stones) maintain contact with the screen and are carried up the incline by the machine’s differential vibration, eventually being discharged through a separate stone outlet.
Applications and Benefits
Destoners are essential for:
- Product Purity: Ensuring the final product is free from hazardous, high-density contaminants.
- Equipment Protection: Removing stones prevents severe damage, wear, and tear to expensive downstream machinery like grinders, hullers, and milling rollers.
- Versatility: They are widely used in rice mills, flour mills, seed cleaning plants, and coffee processing facilities.
