振动作用下冰草种子丸化包衣运动与试验研究

Study on Pelleting Coating Movement and Experiment of Wheat-grass Seeds under Vibration

为了恢复草原植被,提高喷播后冰草种子的发芽率及成活率,自行研制了冰草种子丸粒化包衣机。为研究冰草种子丸粒化包衣规律及探索冰草种子丸粒化包衣机理,基于离散元仿真法,采用Hertz-Mindlin接触模型,运用离散元EDEM仿真软件对振动作用下冰草种子包衣机丸化过程的种群运动状态进行模拟仿真。从单颗粒随机运动轨迹、宏观颗粒流运动矢量图的角度分析颗粒混合过程的宏观混合规律。仿真结果表明:振动频率为25Hz、振幅为3mm、包衣锅转速为40r/min时,种群在能在不同的时间点、相同的空间区域分布的较为理想。在包衣机试验台上进行正交试验,确定了影响包衣合格率的主次因素为包衣锅倾角>转速>振频。

In order to restore grassland vegetation,the germination rate and survival rate of Wheat-grass seeds after spraying were improved. The seed pelleting coating machine for herbage seeds was developed by our research team.Meanwhile,in order to study the law of seed pelleting,the mechanism of seed pelleting was explored. Based on the discrete element simulation method,the Hertz-Mindlin contact model and EDEM simulation software were used to simulate the population movement of the seed coating machine under the vibration. The macroscopic mixing law of particle mixing process is analyzed from the point of view of single particle random motion trajectory and macroscopic particle flow motion vector diagram. The simulation results show that the vibration frequency is 25 Hz,the amplitude is 3 mm,and the coating pan speed is 40 r/min,the population is ideal for the distribution of the same spatial region at different time points. The orthogonal test was carried out on the coating machine test platform. When the vibration frequency was 25 Hz,the dip angle of the coating pot was 35 degrees,and the coating pan speed was 40 r/min,the coating qualified rate was 98. 2%.