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籽瓜籽瓤离散元模型构建及籽瓤分离过程研究
孙浩博1, 李声元1, 黄晓鹏,等1
甘肃农业大学 机电工程学院
摘要:
【目的】针对QW-QZ-2型籽瓜破碎取籽分离机瓜籽含杂率高和筛网各部分分离效率差异大等问题,采用数值模拟方法研究籽瓤分离过程,为籽瓜破碎取籽机的结构优化提供依据。【方法】以甘肃省白银市“靖远一号”品种籽瓜为研究对象,采用试验法测量籽瓜各组分的本征参数,利用Hertz Mindlin with JKR模型,以堆积角为响应标定籽瓜各组分接触参数,进行籽瓜籽瓤分离数值模拟试验,并与试验结果进行对比分析。【结果】利用标定的参数建立籽瓜籽瓤分离数值模拟模型,经试验确定籽瓜破碎取籽机分离辊的较优转速为110~130 r/min,瓜籽含杂率为3.98%~4.03%,在该转速下筛筒区域的瓜瓤分离净度均大于20%且分布较为平均,有效避免了各区域分离效率的差异和分离辊部分区域磨损较大的问题。仿真结果与试验结果基本一致,瓜籽含杂率的最大相对误差为4.71%,瓜瓤分离净度的最大相对误差为6.33%,均满足作业要求。【结论】所建立的离散元模型模拟精度较高,能够满足籽瓜籽瓤分离的需求。
关键词:  籽瓜  破碎取籽机  籽瓤分离  离散元模型
DOI:
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基金项目:国家自然科学基金项目(51765003)
Discrete element model construction and seed flesh separation process of seed gourd
SUN Haobo,LI Shengyuan,HUANG Xiaopeng,et al
Abstract:
【Objective】Aiming at the problems of high impurity rate and large differences in separation efficiency of different parts of crushing and seed extraction machine for QW-QZ-2 seed melon,numerical simulation was used to study the seed and flesh separation process to provide basis for structural optimization.【Method】Based on the Hertz-Mindlin with JKR model,the contact parameters of each component of seed melon were calibrated using stacking angle as the response,and numerical simulations of seed-flesh separation were carried out.The prediction results were also compared and analyzed with experimental results.【Result】A numerical simulation model for the separation of seeds and flesh was established using the calibrated parameters.The optimal speed of separating rollers of the crushing and extraction machine was 110-130 r/min and the trash rate was 3.98%-4.03%.The net separation of melon flesh in the sieve barrel area was greater than 20% and more evenly distributed at this speed,which effectively avoided the differences in separation efficiency among areas and the large abrasion in some areas of the separating roller.The simulation results were in general agreement with experimental results with the maximum relative error of 4.71% for seed trash content and 6.33% for flesh separation clarity,both meeting the operational requirements.【Conclusion】The developed discrete element model had high simulation accuracy and was able to meet the needs of seed and flesh separation for seed melon.
Key words:  seed melon  crushing and seed extraction machines  separation of seed and flesh  discrete element model