永磁体磁吸式排种器充种性能仿真与实验

Simulation on Magnetic Precision Seed-metering Device

以圆柱形永磁体为磁力排种元件设计了永磁体磁吸式精密排种器。对其充种过程进行分析,建立了充种动力学模型,并通过Matlab编程仿真分析了排种轮转速、充种角以及种子相对排种轮的摩擦因数对排种器充种率的影响,并确定了各参数的优化组合。仿真表明,充种率与排种轮转速、充种角以及种子相对排种轮的摩擦因数呈S型、指数型、对数型关系。在优化的参数组合下进行实验,其充种率可达97%。

A kind of permanent magnetic precision seed-metering device was designed.The seeding component was a cylindrical permanent magnet.According to the working principles of the permanent magnetic precision seed-metering,the model of seeds pickup process was established.A Matlab program based on this model was made.The influences of angular velocity,pickup angle,and relative coefficient of friction on pickup ratio were simulated and analyzed.Combination of optimal parameters was found.The relationship between pickup ratio and angular velocity,pickup angle,relative coefficient of friction were S type,exponential type and log-linear type.With the combination of optimal parameters,the pass percentage of seeding could reach to 97%.