磁吸板式排种器充种性能离散元仿真

论述了一种磁吸板式精密排种器结构及工作原理。以单列排种元件为研究对象,采用颗粒离散元法建立排种器仿真模型,分析了种箱移动速度、永磁体磁吸端面磁场强度和充种位置角对排种器充种性能的影响,得到各因素的最佳组合。仿真结果表明,影响排种器充种性能的主要因素是磁体端面磁场强度,其次是种箱移动速度。仿真及样机性能试验均表明,在永磁体端面磁场强度为150 mT、种箱移动速度为0.08 m/s、充种位置角为110°条件下,排种器均具有较好的充种性能,其单播率仿真值为89.57%,实际试验值达87.93%,仿真与试验结果基本一致,证明离散元法仿真分析磁吸板式排种器的可行性,同时也表明磁吸板式精密排种器可用于小颗粒蔬菜种子的精密播种。

Simulation Analysis of Seed-filling Performance of Magnetic Plate Seed-metering Device by Discrete Element Method

The structure and working principle of a magnetic plate precision seed-metering device were introduced. In order to understand the seed-filling performance, the single-row permanent magnet metering elements were made as the research object and the simulation model was established by using particle discrete element method. The seed box moving speed, the magnetic suction surface magnetic field intensity, and the effect of filling position angle on seed-filling performance were simulated, and the best combination of all factors was obtained. The simulation results showed that the main factor influence filling properties was the surface magnetic field intensity of permanent magnet, and the second was the seed box moving speed. Both prototype test and simulation test showed that the metering device had good performance under these conditions of the permanent magnet magnetic field strength 150 mT,seed box moving speed 0.08 m/s, and the filling the position angle 110°. The simulation test value of the single seeding rate was 89.57%, and the actual test value was 87.93%. Simulation and test results were consistent. The results proved that it was feasible using discrete element method to analyze the performance of magnetic plate seed metering device, and the magnetic plate precision seed metering device could be used for small particles of vegetable seeds.