【摘要】 为满足水稻精量穴直播生产需求,以往复式排种器为基础,设计了一种往复拨叉式排种器。介绍了往复拨叉式排种器的工作原理、结构组成及关键部件设计。根据水稻种子的外形尺寸及充种状态概率,设计了5种规格的U型充种型孔;为缩短运种行程,采用了偏心轮传动机构,并设计了刮种装置。借助EDEM离散元法对其进行运动模拟仿真,分析其排种过程并提出改进措施。仿真结果显示:往复拨叉式排种器在充种型孔长、宽、厚分别为10.0、9.0、5.0 mm,拨叉杆往复运行频率为10 Hz运行条件下,稻种粒数为3~6粒的穴数在90%以上,重播指数及漏播指数均小于5%,满足水稻机械化精量穴直播要求。更多还原

【Abstract】 A rice reciprocating fork type metering device was designed based on traditional reciprocating metering device to meet the production requirements of rice precision hill-direct-seeding,and its operational principle,structural composition and key components’ design were introduced. According to the external dimensions and seed-filling state probability of rice seeds,five standards of U type seedfilling hole were designed; eccentric driving mechanism was adopted to shorten the seed-delivering stroke,and seed-scraping device was also designed. This paper had also analyzed the process of seed-metering and proposed improvement measures according to the simulation analysis for rice reciprocating fork type metering device by discrete element method. The simulation results showed that grain number for 3—6grains of rice on the number of holes was more than 90%; reseeding and miss-seeding indexes were both less than 5% under the condition that the length,width and thickness of seed-filling type hole were 10. 0,9. 0,5. 0 mm respectively,and the reciprocating frequency of fork rod was 10 Hz. These simulation results met the requirements of rice mechanization precision hill-direct-seeding.更多还原