气吹式精密排种器工作压力试验研究

通过台架和田间试验,得到了气吹式精密排种器播种玉米适宜的吹气压力范围,并通过单因素方差分析试验考察了吹气压力对播种合格指数、重播指数和漏播指数的影响情况.试验台上采用2种不同材料的排种器进行试验,吹气压力在0.7～8 kPa范围内变化.田间试验为同一工况下多次重复.台架试验发现,吹气压力高于2.5 kPa时播种质量较好,且一直呈上升趋势；8kPa时,合格指数达到97.28％; 2.5～4.5 kPa范围内合格指数在90％左右,漏播指数低于1.2％；田间试验合格率达到93.18％.气吹式排种器适宜吹气压力范围广,漏播率低,田间播种性能稳定可靠.

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.