基于EDEM仿真的机械式辣椒精量排种装置设计与试验

Design and Experiment of Precision Mechanical Metering Device for Pepper Seed Based on EDEM

针对辣椒漂浮育苗中,人工点播存在的劳动强度大、播种效率低和劳动成本高等问题,在磁力回位型排种器的基础上,提出一种适配辣椒漂浮育苗的机械式辣椒精量排种装置,使用SOLIDWORKS等软件对关键结构进行设计和运动分析,并利用EDEM仿真软件对排种装置进行仿真。选取曲柄电机转速、种量和曲柄直径为影响因子,单粒率、重播率和漏播率为评价指标,进行基于Box-Behnken设计的响应曲面法试验,并对试验结果进行分析,采用权重结合隶属度计算综合得分对排种装置的参数组合进行评价,得到排种装置的最优的参数组合为:曲柄电机工作转速260 r·min^(-1),种量4 000粒,曲柄直径28 mm。样机试验播种单粒率、重播率和漏播率分别为91.46%、7.29%和1.25%,满足辣椒漂浮育苗生产技术要求。

Aiming at the problems of high labor intensity,low seeding efficiency and high labor cost existing in manual hill-drop seeding in pepper floating seedling raising,this paper proposes a pepper seed precision mechanical metering device adapted to pepper floating seedling raising on the basis of magnetic return-type seed metering mechanism,and the design and motion analysis of the key structure was carried out using SOLIDWORKS and other software and simulation of the seed metering device was conducted by using EDEM.Taking crank rotary speed,seeds quantity,and crank diameter as factors,and the single grain rate,reseeding rate,and missed seeding rate as evaluation indexes,the response surface test,using Box-Behnken design,was conducted and the results were analyzed.The parameter combinations of the seed metering device are evaluated combining weight with membership degree.The optimal parameters combination for the seed metering device is determined to be crank rotary speed of 260 r∙min_(-1),seed quantity of 4000 grains,and crank diameter of 28 mm.The single grain rate,reseeding rate and missed seeding rate of the prototype test were 91.46%,7.29%and 1.25%,respectively,which met the technical requirements of pepper floating seedling production.