加料机单、双头螺旋对颗粒群接触力的影响
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摘要
为研究螺旋加料机不连续加料过程中颗粒群的运动特性及变化规律,研究了单、双头螺旋对颗粒群接触力的影响.以1. 5 mm直径小米颗粒为研究对象,基于Hertz-Mindlin颗粒无滑动接触模型,对颗粒之间接触力以及颗粒群与螺旋加料料管内壁接触力进行分析,建立了具有分料装置的螺旋加料模型;采用EDEM离散元软件,以间歇转动60°的方式对小米颗粒不连续加料过程进行数值仿真,得到了颗粒间接触力和颗粒群对螺旋加料料管内壁正向和切向压力的分布,比较了240 r·min~(-1)转速下单、双头螺旋输送中颗粒群接触力分布特点.结果表明:单头螺旋输送物料时,颗粒之间比较紧实,但颗粒在内壁接触处易翻滚;双头螺旋输送物料时,颗粒在内壁接触处不易翻滚,更易随轴作轴向运动,颗粒群的一致性更稳定.
To study the movement characteristics and variation law of particles in the discontinuous feeding process of screw feeder,the effect of single/double screw feeder on the contact force of particles was studied. The millet with 1. 5 mm diameter was taken as research object,and the contact force among particles and the contact force between particles and trough were analyzed based on Hertz-Mindlin particle non-sliding contact model. The screw feeding model with feeding device was established. EDEM discrete element software was adopted to simulate the discontinuous feeding process of millet particles by intermittent rotation 60°. The normal and tangential pressure distributions between particles and particle groups on the inner wall of screw feeding tube were calculated. The contact force distribution characteristics of particle groups in single/double screw feeding at 240 r·min~(-1) speed were compared.The results show that the particles are compact but easy to roll in the single-flight screw feeder. The stability of screw discontinuous quantitative feeding is better in the double-flight feeder. The particles are not easy to roll at the inner wall,and the axial movement of particles occurs easily with the shaft.
To study the movement characteristics and variation law of particles in the discontinuous feeding process of screw feeder,the effect of single/double screw feeder on the contact force of particles was studied. The millet with 1. 5 mm diameter was taken as research object,and the contact force among particles and the contact force between particles and trough were analyzed based on Hertz-Mindlin particle non-sliding contact model. The screw feeding model with feeding device was established. EDEM discrete element software was adopted to simulate the discontinuous feeding process of millet particles by intermittent rotation 60°. The normal and tangential pressure distributions between particles and particle groups on the inner wall of screw feeding tube were calculated. The contact force distribution characteristics of particle groups in single/double screw feeding at 240 r·min~(-1) speed were compared.The results show that the particles are compact but easy to roll in the single-flight screw feeder. The stability of screw discontinuous quantitative feeding is better in the double-flight feeder. The particles are not easy to roll at the inner wall,and the axial movement of particles occurs easily with the shaft.
引文
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[3]崔守娟,张西良,徐云峰,等.基于LS-SVM的螺旋定量加料预测及试验研究[J].排灌机械工程学报,2016,34(12):1099-1104.CUI S J,ZHANG X L,XU Y F,et al.Experimental research and prediction of screw dosing based on least squares support vector machine[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(12):1099-1104.(in Chinese)
[4]郭豹,刘厚林,谈明高,等.导叶周向安装位置对离心泵叶轮径向力的影响[J].排灌机械工程学报,2016,34(3):204-209.GUO B,LIU H L,TAN M G,et al.Effect of circumferential setting position of diffuser in concentric volute on impeller radial thrust in centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(3):204-209.(in Chinese)
[5]TALEBI K,MEMARIAN H,ROSTAMI J,et al.Modeling of soil movement in the screw conveyor of the earth pressure balance machines(EPBM)using computational fluid dynamics[J].Tunnelling and Underground Space Technology,2015,47:136-142.
[6]NACHENIUS R W,VAN DE WARDT T A,RONSSEF,et al.Residence time distributions of coarse biomass particles in a screw conveyor reactor[J].Fuel Processing Technology,2015,130:87-95.
[7]姚艳萍,孟文俊,廖志诚,等.平底仓系统水平螺旋输送机效率EDEM仿真研究[J].现代制造工程,2015(2):6-11,29.YAO Y P,MENG W J,LIAO Z C,et al.Study on horizontal screw conveyors efficiency of flat bottomed bins based on EDEM simulation[J].Modern Manufacturing Engineering,2015(2):6-11,29.(in Chinese)
[8]陈凯凯,叶方平,梅磊,等.基于离散元法修正散料垂直螺旋输送运动模型[J].机械设计,2018,35(3):27-32.CHEN K K,YE F P,MEI L,et al.Correction of granular vertical screw transport motion model based on the discrete element method[J].Journal of Machine Design,2018,35(3):27-32.(in Chinese)
[9]罗胜,张西良,许俊,等.螺旋不连续加料装置结构优化与性能仿真[J].农业工程学报,2013,29(3):250-257.LUO S,ZHANG X L,XU J,et al.Structure optimization and performance simulation of screw discontinuous feeding device[J].Transactions of the Chinese Society of Agricultural Engineering,2013,29(3):250-257.(in Chinese)
[10]吴超,胡志超,吴努.基于离散单元法的螺旋输送机数值模拟与分析[J].农机化研究,2015(2):57-61,70.WU C,HU Z C,WU N.Numerical simulation and analysis of screw conveyer based on the discrete element method[J].Journal of Agricultural Mechanization Research,2015(2):57-61,70.(in Chinese)
[11]孙其诚,辛海丽,刘建国,等.颗粒体系中的骨架及力链网络[J].岩土力学,2009,30(增1):83-87.SUN Q C,XIN H L,LIU J G,et al.Skeleton and force chain network in static granular material[J].Rock and Soil Mechanics,2009,30(S1):83-87.(in Chinese)
[12]HOU Q F,DONG K J,YU A B.DEM study of the flow of cohesive particles in a screw feeder[J].Powder Technology,2014,256(2):529-539.
[13]PAULICK M,MORGENEYER M,KWADE A.Review on the influence of elastic particle properties on DEMsimulation results[J].Powder Technology,2015,283:66-76.
[14]HORABIK J,MOLENDA M.Parameters and contact models for DEM simulations of agricultural granular materials:a review[J].Biosystems Engineering,2016,147:206-225.
[15]KRETZ D,CALLAU-MONJE S,HITSCHLER M,et al.Discrete element method(DEM)simulation and validation of a screw feeder system[J].Powder Technology,2016,287:131-138.
[16]HAN Y L,JIA F G,ZENG Y,et al.DEM study of particle conveying in a feed screw section of vertical rice mill[J].Powder Technology,2017,311:213-225.
[17]OREFICE L,KHINAST J G.DEM study of granular transport in partially filled horizontal screw conveyors[J].Powder Technology,2017,305:347-356.
[18]王国强,郝万军,王继新.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.