薏苡精量排种器试验研究

针对贵州丘陵山地薏苡精量穴播机具需求，依托勺轮式精量播种机，实现薏苡多粒穴播。结合薏苡种植农艺要求，探讨机械式薏苡精量播种性能参数的最佳匹配。保证穴距的前提下，以排种器的排种粒数为评价指标，建立不同输送带速度与排种速度的函数关系，优化勺轮型孔数与排种轮导种槽数的对应关系，确定了试验参数，在排种试验台上进行薏苡排种试验。试验表明:输送带速度对排种粒数影响不显著；孔槽比18∶18时，不能满足粒数要求；孔槽比18∶9，穴距挡位140 mm，行驶速度约5 kmh（对应排种轴转速33.18 rmin）为薏苡播种机最佳参数匹配。 

Experimental Research of Precision Seeding Apparatus for Coix

With the aim at demand of precision seeding for coix on small hilly land in Guizhou province，scoop wheel precision seeding machine was applied for coix seeds hole sowing.According to requirements of coix seeding，the best parameters matching of seeding machine was discussed and analyzed.Under premise of fixed hill spacing and demanded seed filling performance，the function relation of conveyor velocity and rotate speed of discharging seeds was established.The ratio between holes of scoop wheel and grooves of discharging wheel was optimized.Experiments were carried out on seeding platform.Results of experiments showed that the speed of conveyor belt had no significant effect on number of discharged seeds.The requirement number of discharged seeds could not be satisfied when ratio of holes-grooves was 18∶18.The optimum parameter matching for seeding machine was that ratio was 18∶9，hill spacing was 140 mm，driving speed was about 5 kmh，and corresponding rotated speed of discharging shaft was 33.18 r/min.