Authors

Abstract

In order to solve the problems of poor universality and complex structure of the current air-suction precision seed metering device for small vegetable seeds, an air-suction precision seed metering device based on the physical characteristics of small vegetable seeds was developed. The physical characteristics of several typical small vegetable seeds were measured to provide a theoretical basis for the design of air-suction precision seed metering device. Analyzed the force on the seed during seed metering, and used discrete element method to analyze the overall state of the seed at different times in combination with the basic structure. The experiment was designed with the pass rate, replay rate and miss rate as experimental indicators. The regression model was established to obtain the reasonable range of each parameter. The experimental results showed that when the rotary table speed was 28.65 r/min and the working negative pressure was 4.40 kPa, the seeding pass rate of the seed meter was 91.07%, the replay rate was 4.70%, and the missed rate was 4.23%.

Abstract in Chinese

针对目前小粒径蔬菜种子气吸式精密排种器存在的通用性差、结构复杂等问题，设计了一种基于小粒径蔬菜种子物理特性的气吸式精密排种器。测定多种典型小粒径蔬菜种子的物理特性，为排种器的设计提供理论基础，分析排种过程中种子受力情况，结合基本结构运用离散元方法对种子不同时间的整体状态进行分析。以合格率、重播率、漏播率为实验指标，通过正交试验分析得出排种时各参数的合理区间。实验结果表明：当转盘转速为28.65r/min，工作负压为4.40kPa时，排种器排种合格率为91.07%，重播率为4.70%，漏播率为4.23%。