1.  It removes stone, clod by adjusting wind pressure and amplitude higher specific gravity materials (stone) will sink to the bottom and move  up towards higher edge under stress of vibration friction; lighter specific gravity materials (seeds / grain)  moves down  towards  lower edge.

2.  Equiped with internal fans, no need to install wind net system. The Fans and vibration system are equipped different motors, non interference .

3. A transducer speed regulator help adjust vibrating frequency for different materials to achieve best effect.  Small material (millet),  medium materials (mung bean, soybean), large materials (kidney beans, broad beans )