气吸与机械辅助附种结合式玉米精量排种器

针对气吸式排种器播种玉米时漏播率较高、地头漏播严重等问题,设计了一种采用机械托种盘辅助附种的气吸式玉米精量排种器,利用托种盘窝眼对种子的托附和夹持作用,实现对气吸式排种盘的辅助附种.分析并确定了排种器工作区域和托种盘主要结构等关键参数.试验结果表明:在前进速度6～12 km/h时,该排种器的粒距合格指数A≥91.40％、重播指数D≤3.82％、漏播指数M≤4.78％、合格粒距变异系数C≤18.37％,具有良好的排种效果.在10 km/h作业速度下,该排种器(真空室相对压力-3 kPa)的各项性能指标均明显优于常规气吸式排种器(真空室相对压力-4 kPa),其中漏播指数比后者相对降低了29％.

Air-suction Corn Precision Metering Device with Mechanical Supporting Plate to Assist Carrying Seed

Focusing on the problem of high missing-seeding rate of commonly used air-suction seed metering device when sowing corn seeds, especially at the edge of fields, a kind of air-suction precision metering device which used a mechanical supporting plate to assist carrying seeds was designed. There were many cells around the edge of the mechanical supporting plate which help to support and grip seeds, so the performance of attaching seeds of the air-suction seeding disc increased remarkably. The parameter of metering-device working area and main structural parameters of the supporting plate were analyzed and determined. Experiment results showed that the seeding quality of the newly designed metering device was satisfactory and the qualified index of seed spacing exceeded 91.40%, the missing-seeding rate and the reseeding rate were less than 3.82% and 4.78% respectively, and the coefficient of variation of seed spacing was less than 18.37%. All of which were obviously better than the corresponding indexes of commonly used air-suction seed metering device under the same working speed and air pressure.