中文摘要：

为满足水稻田间精量成行成穴机械直播要求,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-Expert 6.0.10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10.8 mm、排种轮工作转速为23.2 r/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。

英文摘要：

To meet the requirements of precision rice direct-seeder and linear and holey sowing of the seeds lining and holing in the operation of field seeding,a precision hill-direct-seeding seed metering device with spiral slots and hook-spoons was developed to improve the current situation of labor. The movement track of spiral slot inner sprouting rice seed was analyzed in the process of seed-sowing by means of the Matlab software,as well as rotational quadratic orthogonal experiments was used to further analyze the effects of the rate of average hill diameter,the rate of seeds＇ number in the hill and leakseeding rate on seeding performance： rotation speed,working length of spiral sheave and lead angle. The JPS-12 detecting and experimental set of seed metering device was selected to test sowing performance.Experimental data was analyzed by Design-Expert software so as to establish the mathematical model between the experimental factors and experimental indexes. The result showed that the best operational parameter combination was lead angle of 71. 0°,working length of spiral sheave of 10. 8 mm,and the rotation speed of 23. 2 r / min. The correct rate of average hill diameter was 91. 06%,the correct rate of seeds＇ number in the hill was 94. 64% and the leakage-seeding rate was 3. 64%. The sowing performance can meet the requirement of rice planting in the operation of field.