Authors

Abstract

In order to meet the requirements of rice field precision direct seeding in rows and hills, a spiral grooved seed metering device for rice field precision direct seeding in hills is designed. The Matlab software is used to study the movement trajectory of rice buds in the spiral groove during the seeding process. Based on the quadratic regression-orthogonal rotation combination design, and taking the working speed of the seeding wheel, the spiral groove length and the helix angle of the spiral groove as the test factors, as well as the qualified rate of hill diameters, the qualified rate of hill grains and the miss-seeding rate as the indicators, the seed metering performance is tested by JPS-12 metering device test bench. The test data are analyzed by using Design-Expert 6.0.10 software to obtain a mathematical model between the factors and indicators. The test results show that when the spiral groove rise angle is 71.0°, the spiral groove length is10.8mm, and the working speed of the metering wheel is 23.2r/min, the qualified rate of hill diameter, qualified rate of hill grains and miss-seeding rate are 91.06%, 94.64% and 3.64% respectively. The seeding performance meets the agronomic requirements of rice field seeding.

Abstract in Chinese

为满足水稻田间精量成行成穴机械直播的要求，设计了一种螺旋槽式水稻田间精量穴直播排种器。应用Matlab软件对排种过程中螺旋槽内水稻芽种的运动轨迹进行了研究。采用二次回归正交旋转组合设计，以排种轮工作转速、螺旋槽长度、螺旋槽升角为试验因素，穴径合格率、穴粒数合格率和漏播率为指标，利用JPS-12型排种器检测试验台对排种性能进行试验，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：当螺旋槽升角为71.0°、螺旋槽长度为10.8mm和排种轮工作转速为23.2r/min时，穴径合格率、穴粒数合格率和漏播率分别为91.06%、94.64%和3.64%，排种性能满足水稻田间播种的农艺要求。