Layout and function of the grain singling unit

The grain singling unit singles the seed with air overpressure. The application rate determines the required grain spacing. The application rate is set by selecting the singling discs and singling disc speed. The speed of the singling discs is adjusted on the control terminal. Machines with CurveControl regulate the speed for each row separately, so that the grain spacing is maintained even when driving in curves. Each grain singling unit has its own seed hopper. The seed flows through the inlet opening in the grain singling unit.

The compressed air fan produces the overpressure in the grain singling unit. The grains from the supply area 1 adhere to the holes of the singling disc due to the overpressure. The rotating singling disc guides the singled seed past the scrapers. The scrapers remove excess seed grains 2. The excess seed grains fall back into the supply area. On the opto-sensor, the holes of the singling disc are closed by the hole covering roller 3. The seed is transferred to the feed channel by the air current at the opto-sensor 4. The opto-sensor monitors the grain singling unit.