基于EDEM的玉米小区排种器种盘充种性能分析试验

Analysis and Test of Filling Performance of Seed Platter in Maize Plot Based on EDEM

鉴于玉米小区试验过程中存在的漏播问题,以气吸式精量排种器的带凹槽种盘为研究对象,基于离散元软件EDEM,以种群受力、种群运动速度为试验指标,分析对比无凹槽种盘以及1、1.5、2mm凹槽深度排种盘对玉米种群搅动情况的影响。仿真试验显示:当充种室内玉米籽粒数量较少时,随着种盘搅种凹槽深度增加,玉米种群的离散度明显增加,玉米籽粒相互间的摩擦明显下降,种盘吸种孔对玉米籽粒的吸附能力能够有效提升。通过台架试验对仿真试验结果进行验证,结果表明:当排种盘搅种凹槽深度为1.5mm、种盘转速为2.5rad/s、吸种负压为-4.4kPa时,排种器的漏播指数为1.450%,重播指数为2.904%,合格指数为95.646%,漏播率显著降低,满足育种试验要求。

Aiming at the problem of leakage seeding in the process of corn plot experiment,the grooved seed tray of the air-suction precision seed platter was taken as the research object,and the simulation test was carried out on the agitation of corn grain population according to the depth of the stirring groove of the seed tray by using the discrete element software EDEM.The population force and population movement speed were taken as the test indexes to analyze and compare the seed tray without grooves.Effect of seed row plate with groove depth of 1mm,1.5mm and 2mm on the agitation of maize population.The simulation results showed that when the number of corn grains in the filling room was relatively small,the dispersion of corn population increased significantly and the friction between corn grains decreased significantly with the increase of the depth of the stirring groove of the seed tray,which effectively improved the adsorption capacity of the seed hole of the seed tray to corn grains.The results of the simulation test were verified by bench test.When the depth of the stirring groove of the seed platter was 1.5mm,the speed of the seed platter was 2.5rad/s,and the suction negative pressure was-4.4kPa,the leakage index of the seed platter was 1.450%,the replay index was 2.904%,the qualified index was 95.646%,and the leakage rate was significantly reduced.Meet the requirements of breeding test.