Authors

Abstract

In order to realize the mechanical direct seeding of precision rows and hills in rice field, a rotary precision hill direct seed-metering device for rice was designed. Through designing the key components of seed-metering device and analyzing its working principle, the main factors and critical conditions affecting the seed-metering performance were obtained. Using the secondary rotation combination test, taking the rotation speed of seed-metering disc and seed capacity height as the test factors, and the re-broadcasting rate, seed-metering qualified rate and miss-seeding rate as the indexes, the seed-metering performance was experimentally studied by using the JPS-12 seed-metering device tested. Design-Expert 6 0.10 software was used to analyze the test data to obtain the mathematical model between factors and indexes. The test results show that when the speed of the seed-metering plate was 24.60r/min and the seed capacity height was the radius of the seed-metering disc, the qualified rate of seed-metering was 94.83%, the re-broadcasting rate was 3.43%, and the miss-seeding rate was 1.74%. The seeding performance meets the agronomic requirements of rice seeding, and provides a reference for the design of the whole machine.

Abstract in Chinese

为实现水稻田间精量成行成穴机械直播，设计了一种转勺式水稻田间精量穴直播排种器。通过设计排种器关键部件，并对其工作原理进行分析，得到影响排种性能主要因素和临界条件。采用二次旋转组合试验以排种盘转速、容种高度为试验因素，重播率、排种合格率和漏播率为性能指标，利用JPS-12排种器检测试验台对排种性能进行试验研究，并运用Design-Expert6.0.10软件对试验数据进行分析，得到因素与指标之间的数学模型。试验结果表明：排种盘转速为24.60r/min、容种高度为排种盘半径时，排种合格率为94.83%，重播率为3.43%，漏播率为1.74%，排种性能满足水稻田间播种的农艺要求，并为整机设计提供参考。