摘要
针对颗粒饲料在加工过程中易发生破碎,因其破碎机制尚不明确,难以通过优化加工机械的关键结构、运行参数来降低颗粒破碎率的实际问题,本研究以颗粒饲料(母猪饲料)为研究对象,应用离散元素法建模软件EDEM建立了颗粒饲料离散元模型,结合台架试验(质构仪)开展了离散元粘结参数[单位面积法向刚度(K_(n))、单位面积剪切刚度(K_(t))、临界法向刚度(C_(n))、临界剪切刚度(C_(t))]测试与标定试验。台架试验结果表明,C_(n)、C_(t)的取值分别为2.93×10^(7)、2.22×10^(6)P_(a),K_(n)、K_(t)的量级范围分别为[10^(10),10^(11)]、[10^(9),10^(10)];二次正交旋转组合试验结果表明,当Kn、Kt的取值分别为4.11×10^(10)、7.13×10^(9)N/m^(3)时,仿真模型的挤压、剪切破碎力与实际破碎力之间的误差均在5%以内,标定结果准确;颗粒饲料破碎过程分析表明,饲料样品承受剪切破坏的能力不及其承压能力,但剪切破坏时不易发生粉化。本研究可为优化饲料加工机械的关键结构及运行参数、降低颗粒破碎率提供理论参考。
Given that pellet feed is prone to breakage during processing,it is difficult to reduce the practical problems of pellet breakage rate by optimizing the key structure and operating parameters of processing machinery because its breakage mechanism is still unclear.In this study,the discrete element model of pellet feed(sow feed) was established by applying EDEM as the research object,and the testing and calibration tests of discrete element bonding parameters(normal stiffness per unit area K_(n),shear stiffness per unit area K_(t),critical normal stiffness C_(n),critical shear stiffness C_(t)) were carried out in combination with the bench test.Bench test show that the Cnand Ctvalues were 2.93×10^(7)Pa,2.22×10^(6)Pa.The magnitude ranges of Knand Ktare [10^(10),10^(11)]and [10^(9),10^(10)],respectively.The secondary orthogonal rotational combination test showed that when the values of Knand Ktwere 4.11×10^(10)N/m^(3) and 7.13×10^(9)N/m^(3),respectively,the errors between the crushing and shearing crushing forces of the simulation model and the actual crushing force were within 5%,and the calibration results were accurate.The analysis of the pellet feed crushing process shows that the feed samples are not able to withstand shear damage as well as their pressure-bearing capacity,but they are not easy to produce pulverization during shear damage.This study can provide theoretical reference for optimizing the key structure and operation parameters of feed processing machinery and reducing the granule crushing rate.
作者
王雷
张永林
李彬
路婉秋
杨柳
刘晓鹏
WANG Lei;ZHANG Yonglin;LI Bin;LU Wanqiu;YANG Liu;LIU Xiaopeng(College of Mechanical Engineering,Wuhan Polytechnic University,Hubei Wuhan 430023,China;College of Animal Science and Nutritional Engineering,Wuhan Polytechnic University,Hubei Wuhan 430023,China)
出处
《饲料工业》
CAS
北大核心
2023年第1期10-17,共8页
Feed Industry
基金
湖北省自然科学基金青年项目[2021CFB292]
湖北省教育厅科学技术研究项目[Q20201608]
武汉轻工大学校立科研项目[2021Y33]。
