基于离散单元法的小麦磨粉机研磨机构操作参数优化
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摘要
【目的】优化小麦磨粉机研磨机构的操作参数.【方法】基于离散单元法理论,对研磨机构在不同操作参数下的工作过程进行了数值模拟和试验验证.【结果】在同一轧距下,快辊表面与颗粒的接触数目变化量大于慢辊表面,物料在快辊表面滑移的趋势大于慢辊,快辊对物料施加的研磨作用大于慢辊;轧距选取1.4 mm时,快辊、慢辊与物料颗粒的接触数量变化量、辊面压力均大于轧距为0.8、2.0 mm时,剪切、摩擦及揉搓等载荷作用更为明显,研磨效果更佳;相对于对辊速比1.05、1.45,速比为1.25时,物料颗粒接触变化量在数据输出区间中的变化范围、波峰值、能耗突变均小,磨粉机运行较为平稳.
【Objective】 To optimize the operating parameters of the milling mechanism of wheat mill.【Method】 The numerical simulation and experimental verification of the milling mechanism working process with different parameters were carried out based on the discrete element method.【Result】 Under same roller gap,compared with slow roller,the change number of contact particles on fast roller surface were higher,the slip trend of particles on fast roller surface was faster,the milling force of fast roller was bigger.Compared with 0.8 mm and 2.0 mm roller gaps,the change number of contact particles and roller surface force of both fast and slow rollers were higher when the roller gap was 1.4 mm,so the shear,kneading,friction and load were more obvious,the grinding effect was better.Compared with 1.05 and 1.45 roller speed ratio,the variation range in the data output interval of the change number of contact particles,wave peak and energy consumption were lower while the ratio was 1.25,so the mill worked more smoothly.
【Objective】 To optimize the operating parameters of the milling mechanism of wheat mill.【Method】 The numerical simulation and experimental verification of the milling mechanism working process with different parameters were carried out based on the discrete element method.【Result】 Under same roller gap,compared with slow roller,the change number of contact particles on fast roller surface were higher,the slip trend of particles on fast roller surface was faster,the milling force of fast roller was bigger.Compared with 0.8 mm and 2.0 mm roller gaps,the change number of contact particles and roller surface force of both fast and slow rollers were higher when the roller gap was 1.4 mm,so the shear,kneading,friction and load were more obvious,the grinding effect was better.Compared with 1.05 and 1.45 roller speed ratio,the variation range in the data output interval of the change number of contact particles,wave peak and energy consumption were lower while the ratio was 1.25,so the mill worked more smoothly.
引文
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[2] Koutinas A A,Wang R,Campbell G M,et al.A whole crop biorefinery system:A closed system for the manufacture of non-food products from cereals[J].Biorefineries-Industrial Processes and Products,2008(1):165-191.
[3] 杜润鸿,刘素山.辊式磨粉机轧距稳定影响因素的研究[J].粮食与食品工业,2014(5):24-25,28.
[4] Liu C,Liu L,Li L,et al.Effects of different milling processes on whole wheat flour quality and performance in steamed bread making[J].LWT-Food Science and Technology,2015,62(1):310-318.
[5] Sakhare S D,Inamdar A A,Indrani D,et al.Physicochemical and microstructure analysis of flour mill streams and milled products[J].Journal of Food Science & Technology,2015,52(1):407-414.
[6] Baasandorj T,Ohm J B,Manthey F,et al.Effect of kernel size and mill type on protein,milling yield,and baking quality of hard red spring wheat[J].Cereal Chemistry,2015,92(1):81-87.
[7] Fistes A,Rakic D,Vukmirovic D,et al.The possibilities of wheat roller milling optimization using the response surface methodology[J].2017,21(2):118-123.
[8] Dal-Pastro F,Facco P,Zamprogna E,et al.Model-based approach to the design and scale-up of wheat milling operations-proof of concept[J].Food & Bioproducts Processing,2017,106:127-136.
[9] Mateos-Salvador F,Sadhukhan J,Campbell G M.Extending the normalised kumaraswamy breakage function for roller milling of wheat flour stocks to second break[J].Powder Technology,2013,237(3):107-116.
[10] Galindez-Najera S P,Choomjaihan P,Barron C,et al.A compositional breakage equation for wheat milling[J].Journal of Food Engineering,2016(182):46-64.
[11] 平海,苏帆.辊式磨粉机磨辊的优化设计[J].粮食与饲料工业,1995(7):19-23.
[12] 徐桂清.磨辊直径为300 mm与250 mm两种磨粉机性能之比较[J].粮油加工与食品机械,2004(3):21-22.
[13] 廖庆喜,舒彩霞,田波平.辊式磨粉机对辊工作力学条件分析[J].包装与食品机械.2005,23(2):1-3.
[14] 刘自然,李东梁,武文斌.辊式磨粉机磨辊的受力计算和强度分析[J].粮食与饲料工业,2009(12):7-10.
[15] 赵瑞营,戴飞,赵武云,等.基于离散单元法的高填充率窝眼轮式精密排种器排种仿真试验[J].甘肃农业大学学报,2017,52(1):132-138.
[16] 顾尧臣.磨粉机喂料结构和参数的探讨[J].面粉通讯,2004(3):23-26.
[17] 姜鹏.基于离散元法的碾米机三维仿真分析[D].哈尔滨:东北农业大学,2013.
[18] 贾富国,韩燕龙,刘杨,等.稻谷颗粒物料堆积角模拟预测方法[J].农业工程学报,2014,30(11):254-260.
[19] 张克平,贾娟娟,吴劲锋.谷物力学特性研究进展[J].食品工业科技,2014,35(2):369-374.
[20] 王国强,郝万军,王继.离散单元法及其在EDEM上的实践[M].西安:西北工业大学出版社,2010.
[21] 陆振曦,陆守道.食品机械原理与设计[M].北京:中国轻工业出版社,1995.