摘要
针对青贮玉米收获机玉米籽粒破碎效果差、破碎率低、影响青贮秸秆发酵与籽粒养分转化的问题,设计了适合青贮玉米籽粒破碎的碟盘式青贮玉米籽粒破碎试验台,对关键部件刀盘进行了参数化设计,基于DEM法对籽粒破碎过程进行了运动和力学分析,首先建立基于离散元法的玉米籽粒粘结颗粒模型;利用EDEM离散元仿真软件开展正交仿真试验优化,选取刀齿数、刀刃深度、破碎间隙和刀辊转速作为仿真试验因素,籽粒破碎率为试验考察指标,确定了最优组合参数,即刀齿数48、刀刃深度5 mm、破碎间隙2 mm、刀辊转速59 r/s,在该条件下籽粒破碎率为90.35%,仿真试验与台架试验相对误差为3.36%;台架试验结束后,采用宾州筛对其筛分,物料可分为小型、标准、大型和未完全破碎型4种,占比分别为1.3∶6∶1.8∶0.9,与仿真试验结果一致。台架试验各指标满足行业标准,实现了对玉米籽粒的高破碎和高作业效率。
Aiming at the problem of poor corn kernel crushing effect and low crushing rate of corn silage corn harvester,which affects the fermentation of silage straw and the conversion of kernel nutrients,combined with the disc-type kernel crushing technology which has the advantages of high working efficiency and good crushing quality,a dish-type silage corn kernel crushing test bench suitable for crushing silage corn kernels was developed.Parametric design of the key components of the cutter head,the movement and mechanical analysis of the grain crushing process were done based on the DEM method,firstly,the corn kernel bonding particle model was established based on the discrete element method.The EDEM discrete element simulation software was used to carry out the optimization simulation of the orthogonal experiment.The number of teeth,depth of blade,crushing gap and speed of the cutter roll were selected as the simulation test factors.The grain crushing rate was tested and investigated.The optimal combination parameter was determined:the number of teeth was 48,the depth of blade was 5 mm,the crushing gap was 2 mm,and the speed of the knife roll was 59 r/s.Under these conditions,the grain crushing rate was 90.35%,and the relative error between the simulation test and the bench test result was 3.36%.After the end of the bench test,the materials were screened with a Pennsylvania screen.The materials can be divided into four types:small,standard,large and incompletely crushed,with a ratio of 1.3∶6∶1.8∶0.9,which was consistent with the simulation test results.The various indicators of the bench test met the industry standards,achieving high crushing of corn kernels and high working efficiency.
作者
牟孝栋
姜慧新
孙延成
徐海港
姚艳春
耿端阳
MOU Xiaodong;JIANG Huixin;SUN Yancheng;XU Haigang;YAO Yanchun;GENG Duanyang(School of Agricultural and Food Engineering,Shandong University of Technology,Zibo 255000,China;Shandong Animal Husbandry Station,Ji’nan 250022,China;Shifeng Group Co.,Ltd.,Liaocheng 252800,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2020年第S01期218-226,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
山东省农业重大应用技术创新项目(SD2019XM001)
山东省农机装备研发创新计划项目(2017YF004)。
关键词
青贮玉米收获机
籽粒破碎
离散元
破碎刀盘
碟盘式
corn silage harvester
crushing of grains
discrete element
broken knife dish
disc type
