Authors

Abstract

A negative pressure chamber rotary precision seed metering device was designed to achieve the buckwheat precision sowing goal, solving the problems of traditional negative pressure chamber poor sealing and air suction seed metering device high power consumption. The planting plate of the device was fixedly connected with the shell of the air chamber forming a negative pressure chamber, which rotates around an axis. A planting plate suitable for buckwheat seed metering was designed. Single factor test and response surface test were carried out on the seed metering device. Results showed that the buckwheat precision seed metering achieved best performance when the negative pressure, suction hole diameter and rotation speed was 2.4 kPa, 2.0 mm and 25 r/min respectively. The qualified index, multiples index and miss-seeding index were respectively 88.32%, 7.35%, and 4.33%, which met the technical requirements of buckwheat precision sowing. The results of the study provided references for the design and application of buckwheat precision seed metering device.

Abstract in Chinese

为实现荞麦精量化播种，解决传统气吸式排种器负压气室密封差、功耗较高等问题。设计一种气室旋转式精量排种器，该排种器排种盘与气室后壳固定连接形成负压气室，工作时负压气室绕排种轴旋转，具有转动能耗小、气密性好等特点，并设计了适合于荞麦排种的排种盘。利用该排种器进行台架试验，以合格指数、重播指数、漏播指数为评价指标，气室真空度、排种孔孔径、排种盘转速为试验因素进行单因素试验和响应面试验。结果表明，在排种器气室负压值2.4kpa、排种盘孔径2.0mm、排种盘转速25r/min的组合下，荞麦精量排种效果较好，单粒精密排种合格指数 88.32%，重播指数7.35%，漏播指数4.33%，满足荞麦精量化播种技术要求。本研究可以为荞麦精量化排种器的设计和应用提供参考。