摘要
为满足自行研制的水稻内充气力式精量排种器定距成穴的排种要求,对排种器的投种过程进行运动学分析,构建了稻种的理论投种轨迹,并以此设计了一种具有投种轨迹特征形状的变截面矩形导种管。运用离散元方法与台架排种试验,对影响排种成穴性与均匀性的导种管底板倾角与吸种滚筒转速进行仿真分析。结果表明,每穴颗粒排出最大时间差与相邻穴时间间隔变异系数均随导种管底板倾角减小和吸种滚筒转速增大而增大;台架排种试验表明,穴径平均值与穴距变异系数均随导种管底板倾角减小和吸种滚筒转速增大而增大,与仿真分析结果相吻合,导种管底板倾角取77°时,能适应不同的排种频率,穴粒数合格率高于90.0%,漏播率低于2.2%,重播率低于8.0%,穴径平均值小于28.33 mm,穴径合格率高于91.33%,穴距平均值约为200.00 mm,穴距变异系数小于11.10%,可满足水稻精量穴直播的农艺要求。
In order to meet the direct seeding requirements of the hole-seeding and fixed hill spacing for the selfdeveloped inside-filling pneumatic type precision meter device for rice,the kinematics analysis of seed dropping process was carried out on the meter device to construct the theoretical dropping trajectory of rice seed.A novel rectangular seed spout with variable cross section was designed based on the theoretical dropping trajectory of rice seed.The effects of the bottom plate inclination angle of the seed spout and rotational speed of the seed-absorbed cylinder on hole-seeding and seeding uniformity of the meter device were analyzed by EDEM and bench seeding performance test.The results of simulation analysis showed that the maximum time difference of particles discharge per hole from the seed spout and the time interval variation coefficient of adjacent hole both increased with the decrease in the bottom plate inclination angle of the seed spout and the increase of rotational speed of the seed-absorbed cylinder.The bench test results showed that the average diameter of hole diameter and the variation coefficient of the hole spacing both increased with the decrease of the bottom plate inclination angle of the seed spout and the increase of rotational speed of the seed-absorbed cylinder.The simulation results was in agreement with the experimental results.When the bottom plate inclination angle of the seed spout was 77°,the seeding performances of the meter device were better and stable under different seeding frequency.All the qualified rates(2-4 seeds per hole)were more than 90.0%,all the miss-seeding rates(less than 2 seeds per hole)were less than 2.2%,all the replay rates(more than 4 seeds per hole)were less than 8.0%,all the average diameters of hole diameter were less than 28.33 mm,all the qualified rates of hole diameter(not more than 50 mm between the two farthest seeds in one hole)were more than 91.33%,all the average hole distances slightly fluctuated around 200.00 mm(the theoretical hole distance),
作者
张顺
李勇
王浩宇
廖娟
李兆东
朱德泉
ZHANG Shun;LI Yong;WANG Haoyu;LIAO Juan;LI Zhaodong;ZHU Dequan(College of Engineering,Anhui Agricultural University,Hefei,Anhui 230036,China;Engineering Laboratory of Intelligent Agricultural Machinery Equipment,Hefei,Anhui 230036,China)
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第1期71-80,共10页
Journal of Hunan Agricultural University(Natural Sciences)
基金
国家自然科学基金项目(51805005)
安徽省科学技术厅重大专项(17030701045)
安徽省教育厅项目(KJ2018A0134)。
关键词
水稻精量排种器
内充种
气力式
穴直播
导种管
rice precision meter device
seed inside-filling
pneumatic type
direct hole-seeding
seed spout
