基于离散元法的茶叶抖筛机结构参数优化与试验  

Optimization and experiment of the structural parameters of tea vibratingshifting machine using discrete element method

作　　者：李兵[1,2] 朱勇 方赛弟 方立旭 朱焕成 邹亚刚 LI Bing;ZHU Yong;FANG Saidi;FANG Lixu;ZHU Huancheng;ZOU Yagang(College of Engineering,Anhui Agricultural University,Hefei 230036,China;State Key Laboratory of Tea Plant Biology and Utilization,Hefei 230036,China)

机构地区：[1]安徽农业大学工学院,合肥230036 [2]茶树生物学与资源利用国家重点实验室,合肥230036

出　　处：《农业工程学报》2024年第5期337-343,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：安徽省高等学校科学研究项目(2022AH040124);安徽省科技厅科技攻关项目(2022296906020005)。

摘　　要：茶叶抖筛机是茶叶精加工的关键装备,传统抖筛装备主要通过经验设计,筛分性能较差,主要表现在筛净率较低、误筛率较高。该研究结合抖筛机的筛分原理,运用solidworks构建虚拟样机,利用EDEM软件建立茶叶颗粒离散元仿真模型,通过单因素仿真试验对茶叶颗粒进行动力学分析,结果表明,连杆长度、曲柄半径和筛面倾角是茶叶抖筛机筛分性能的主要影响因素。以筛净率、误筛率为评价指标,设计三因素三水平二次旋转正交试验,并运用DesignExpert软件对试验数据进行回归分析,当连杆长度为1 977 mm、曲柄半径为25 mm、筛面倾角为2.8°时,茶叶筛净率为94.5%、误筛率为4.61%,筛分性能最优。以最优结构参数进行验证试验,筛净率为93.8%,误筛率为4.73%,生产效率为319 kg/h,较优化前筛净率提高3.42%,误筛率降低7.62%,生产效率提高8.87%。该研究结果可为茶叶筛分装备的优化提供理论依据。A tea vibrating-shifting machine is one of the most important equipment in the tea refining process.The low screening performance of traditional vibrating-shifting machines cannot fully meet the large-scale production in recent years,due to the low sieve net rate and high error screen rate.In this study,the virtual prototype was constructed to combine with the screening principle of the vibrating-shifting machine by Solidworks.A discrete element simulation model of tea particles was established by EDEM software.A systematic analysis was made to clarify the motion state of tea particles on the sifting surface.The dynamic simulation was carried out on the vibrating-shifting process of tea particles.A single-factor test was also conducted to obtain the average velocity and average interaction force curve of tea particles.The simulation results show that the connecting rod length,the crank radius,and the sift inclination of the surface were the main influencing factors in the screening performance of the tea vibrating-shifting machine.A three-factor three-level quadratic rotation orthogonal test was designed to perform the regression analysis on the test data using Design-Expert software,where the connecting rod length,the crank radius,and the sift inclination of the surface were taken as the influencing factors,while the sieve net rate and the error screen rate were as the evaluation indexes.The regression analysis showed that the best screening performance of the tea vibrating-shifting machine was achieved,where the sieving rate of the tea vibrating-shifting machine was 94.5%,and the false sifting rate was 4.61%.An optimal combination of parameters was the connecting rod length of the tea vibrating-shifting machine was 1977 mm,the crank radius was 25 mm,and the sift inclination of the surface was 2.8°.The verification test was carried out with the optimal structural parameters of the tea vibrating-shifting machine.The false sifting rate of the tea vibratingshifting machine before optimization was 90.7%,the false s

关 键 词：茶叶 正交试验 抖筛机 筛分 DEM 

分 类 号：S226.5[农业科学—农业机械化工程]