Experimental study on pressure of air-blowing precision seed-metering device

Laboratory and field experiments were carried out to determine the appropriate range of work pressure of the air-blowing precision seed-metering device. And the influence of pressure on the qualified index, multiple index and miss index was investigated by single-element analysis of variance. Two devices made of different material were tested in the experiment. The pressure varied from 0.7 to 8 kPa, and field experiment for the same condition repeated. It was observed that the seed-metering device has satisfactory and steady performance with the pressure over 2.5 kPa in laboratory experiment. And the sowing quality gradually turns better with the increase of the pressure. When the pressure gets to 8 kPa, the qualified index is 97.28%. The analysis of variance shows that there is appreciable impact of variation of the pressure on the planting quality. The average qualified index surpasses 90% within the range of 2.5-4.5 kPa. In the field test, the qualified index is 93.18%. The air-blowing precision seed-metering device has superior flexibility on the variation of pressure, low miss index and stable field operation.