玉米窝眼轮排种器性能影响因素试验研究—基于EDEM  

Research and Experiment on Nest Hole Wheel Seed-metering Device of Maize—Based on EDEM

作　　者：鹿瑶[1] 吕钊钦[1] 郑文秀[1] 蔡玉虎 刘正铎 

机构地区：[1]山东农业大学机械与电子工程学院,山东泰安271018

出　　处：《农机化研究》2018年第6期155-161,共7页Journal of Agricultural Mechanization Research

基　　金：山东省现代农业技术体系创新团队岗位专家项目(NO.SDAIT10-22-10)

摘　　要：为研究玉米籽粒形状及工作转速对排种性能的影响,设计了窝眼轮排种器的型孔参数,建立了窝眼轮排种器的离散元仿真模型。运用EDEM离散元仿真软件,基于组合球法建立了玉米籽粒的离散元模型,并应用离散单元法理论对排种器进行排种性能仿真实验,分析了排种过程中由于不同籽粒形状所造成的漏播、重播等问题的原因。仿真及台架试验结果表明:当工作转速为10~35 r/min时,锥形玉米颗粒排种合格指数为88.1%~9 6.3%,优于球形玉米颗粒的8 7.1%~9 3.5%和矩形玉米颗粒的8 5.5%~9 1.8%;同时,随工作转速的增加,排种合格指数下降,漏播指数提高,重播指数下降。田间试验表明:优化型孔的窝眼轮排种器对各形状籽粒的排种性能均满足精密排种的要求。最后,仿真结果与台架实验结果进行对比分析,证明采用EDEM软件对窝眼轮式排种器进行仿真分析的正确性。In order to study the effect of corn grain shape and working speed on seeding performance, the parameters of the nest hole on wheel seed-metering were designed, and the discrete element simulation model of the nesting wheel metering device was established. The discrete element model of maize kernels was established by using EDEM discrete element simulation software, based on the ways of ball combination. The rotational speed and the shape were selected as influencing factors, and the qualified index, the repeated index and the missing index were selected as experimental indices. The main causes of repeated seeding and missing seeding on different size grades of corn grains were researched. The simulation and the experiment results show that, when the working speed is between 10 r/rain to 35r/min, the qualified index of conical maize grain is 88.1% -96.3% , which is better than 87.1% -93.5% of spherical corn grain and 85.5% -91.8% of rectangular corn grain, and with the increase of the working speed, the qualifying index decline, the missing index increased and the replay index decreased. The field test showed that, the seeding performance of seed-metering device could meet the requirements of precision sowing for all size grades of corn grains. The simulation results are compared with the experimental results of the test bench, which proves the correctness of the simulation analysis on the nested wheel metering device using EDEM software.

关 键 词：玉米籽粒 窝眼轮 离散元仿真 

分 类 号：S220.3[农业科学—农业机械化工程]