摘要
为实现在线近红外技术在饲料生产线上的有效应用,设计了一种针对非接触式近红外探头的在线饲料监测平台,该平台安装于斗式提升机与旋转分配器之间的下料溜管处,通过平台内部加入挡板结构、形成集料空间,影响饲料颗粒的运动轨迹,降低料流速度,提高料流的均匀稳定性。基于平台的几何结构参数构建了EDEM-Recurdyn耦合仿真模型,以在线近红外饲料监测平台的方管长度、方管宽度、固定挡板角、固定挡板长度为试验因素,以饲料颗粒在平台内的平均速度和变异系数为评价指标,进行了四因素三水平正交试验。试验和极差分析表明,方管宽度对饲料料流速度和均匀度特性的影响最显著;平台结构参数的最优方案为:方管长度850 mm、方管宽度250 mm、固定挡板角20°、固定挡板长度180 mm,此时饲料颗粒的平均速度为0.87 m/s,变异系数为5.32%。通过样机试验验证了仿真优化结果的有效性,该平台可持续获得满足在线分析要求的近红外光谱曲线。
In order to realize the effective application of online near-infrared technology in feed production line,an online monitoring platform for non-contact near-infrared probe was designed.The platform was installed at the delivery chute between the bucket elevator and the rotary distributor.The aggregate space formed by the baffle structure was added inside the platform to affect the trajectory of the feed particles,so as to reduce the speed of the feed flow and improve the uniform stability of the feed flow.The EDEM-Recurdyn coupling simulation model was constructed based on the geometric structure of the platform.Taking the length of square tube,width of square tube,fixed baffle angle,and length of fixed baffle as influencing factors,and the mean velocity and coefficient of variation of feed particles in the online near-infrared monitoring platform as evaluation indicators,a four-factor and three-level orthogonal test was carried out.The range analysis results of orthogonal test showed that the width of the square tube had the most significant influence on the feed flow velocity and uniformity characteristics.The optimal scheme for the platform structure parameters could be obtained under the condition that the length of square tube was 850 mm,width of square tube was 250 mm,fixed baffle angle was 20°,and length of fixed baffle was 180 mm.In this case,the mean velocity of feed particles was 0.87 m/s and the coefficient of variation was 5.32%.The effectiveness of simulation optimization results was verified through prototype tests.The platform could continuously obtain near-infrared spectral curves meeting the requirements of online analysis.
作者
金楠
常楚晨
王红英
陈媛媛
方鹏
JIN Nan;CHANG Chuchen;WANG Hongying;CHEN Yuanyuan;FANG Peng(College of Engineering, China Agricultural University, Beijing 100083, China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2020年第7期129-137,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家重点研发计划项目(2018YFD0500600)。
关键词
饲料
在线近红外
监测平台
仿真
离散元法
feed
online near-infrared
monitoring platform
simulation
discrete element method
