Double shutters: ON/OFF and adjustment of the fert dose
One of the characterizing elements of PRIMO fertilizer spreader is the use of two shutters for each outlet both controlled by an electric actuator. The first regulates the dose of fertilizer to be spread, the second the operations of opening and closing of the spreading material (ON/OFF). The simultaneous and combined use of the two shutters maximises spreading accuracy in all parts of the field.
At the time of maneuvers at the headlands, the ON/OFF shutter is closed by the relative actuator which controls it very quickly to avoid spreading where it is not required. At the same time, the metering shutter (located below the ON/OFF one) continues to move proportionally to the speed of the tractor, so that when the spreading activity is resumed it will always be in the correct position. In this way there will be no overdosing or underdosing areas near the headlands, but a uniform spreading in all the different areas of the field will be obtained without waste or inefficiencies.