气吸式谷子精量排种器性能试验研究

Experimental study on the performance of pheumatic precision metering device for millet seeds

为实现谷子的精量播种,设计一种适应谷子这种小粒径作物播种的气吸式精量穴播排种盘。该排种盘具有成群分布吸孔的特点,可同时吸附多粒种子。利用该排种盘在计算机视觉排种器试验台上进行谷子排种性能试验。分别以合格指数、重播指数、漏播指数为评价指标,对排种盘孔数、排种盘孔径、排种盘转速和气吸室真空度4个因素进行单因素试验,得到了各因素作业时的较优范围。采用正交试验得到排种性能各因素的较优组合为:排种盘孔数4,排种盘孔径0.8mm,排种盘转速11.0r/min,气吸室真空度-1.2kPa,该组合下,谷子精量排种效果较好,穴粒数合格指数94%,重播指数4%,漏播指数2%,满足谷子精密播种要求。

In order to achieve millet precision seeding, a precision air-suction seed hill-drop plate, which adapt small particle size of crops such as millet to the sowing, is designed. The seed plates are distributed by the suction hole groups to adsorb more seeds. The test of millet sowing performance on the test bed for computer vision is conducted by utilizing the seed plates. The eligible index, multiple indexes and miss index are employed as judging indexes, respectively. Single factor experiments were carried out with four factors： The number of holes on the seed plate, seed plate aperture, rotational speed of seed plate and air-suction power of vacuum chamber. And optimal range of individual factor is obtained. The optimum combination of all factors is obtained by orthogonal test： The number of holes on the seed plate is 4; The seed plate aperture is 0.8 mm; The rotational speed of seed plate is 11.0 r/min; The vacuum degree is - 1.2 kPa; The effect of millet precision seeding is better; The eligible index reached 94% ;The multiple index is no more than 4% ;The miss index is less than 2%. The requirements of millet precision seeding are met.