农业机械学报2025，Vol.56Issue(7)：48-59,12.DOI:10.6041/j.issn.1000-1298.2025.07.004
基于离散元法的百合鳞茎弹性多趾揉搓辊组设计与试验
Design and Experiment of Elastic Multi-toed Rubbing Roller Group for Lily Bulbs Based on Discrete Element Method
摘要
Abstract
Aiming at the problems of low mechanization degree and poor stem-soil separation effect as well as severe damage during the mechanized harvesting of lily bulbs,based on the basic physical and mechanical properties of lily bulbs,a set of elastic multi-toed rubbing roller group was designed by applying bionics principles.By measuring the basic physical and mechanical parameters of lily bulbs,it was found that their average size was 83.7 mm ×74.6 mm ×49.0 mm,density was 1.09 g/cm3,and the rolling friction coefficient with polyurethane material was 0.42,while the static friction coefficient was 0.50.According to the requirements of lily bulb harvesting,the dynamic differential equation of lily bulbs on the elastic multi-toed rubbing roller group was established.The key factors affecting the harvesting performance of lily bulbs were found to be:the length of the rubbing toe(L),the rotational speed of the roller shaft(ω),and the number of toes per week(N).A simulation model of the interaction between the elastic multi-toed rubbing roller group,soil,and lily bulbs was established in the EDEM software.With the clear stem rate Y,and the maximum collision force Y2 of lily bulbs as evaluation indicators,a three-factor three-level orthogonal experiment was conducted by using the Box-Behnken central composite design method.Through the construction of the objective function and constraint conditions for optimization approximation,the optimal parameter combination was determined as:L was 52 mm,ω was 54 r/min and N was 6.Under the optimal parameter combination,the clear stem rate Y,of lily bulbs was 97.25％and the maximum collision force Y2 was 12 N.Field experiments verified that the relative errors between the simulation values and the experimental values of the clear stem rate and the maximum collision force were 1.51％and 21.05％,respectively.Moreover,the trial-made elastic multi-toed rubbing lily harvesting device,compared with the traditional conveyor chain-type harvesting device,increased the clear stem rate by 3.3％and reduced the damage rate by 13％,demonstrating excellent harvesting performance,and meeting the relevant requirements for the quality evaluation of root and rhizome Chinese medicinal material harvesters.The research results can provide a solution for the mechanized harvesting of root and rhizome Chinese medicinal materials.关键词
百合鳞茎/弹性多趾揉搓/茎土分离/损伤/仿生Key words
lily bulb/elastic multi-toed rubbing/stem-soil separation/damage/bionic分类
农业科技引用本文复制引用
杨玉婉,任旭光,杨明企,柏鹏,徐俊杰,黄玉祥,席新明,刘正道..基于离散元法的百合鳞茎弹性多趾揉搓辊组设计与试验[J].农业机械学报,2025,56(7):48-59,12.基金项目
国家自然科学基金项目(52305282)、陕西省自然科学基础研究计划项目(2023-JC-QN-0219)、陕西省重点产业创新链项目(2024SF-ZDCYL-03-09)和陕西省农业科技创新及农业关键核心技术攻关项目(2024NYGG011-08) （52305282）
