基于DEM仿真与试验验证的双轴螺旋输送机结构优化分析
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摘要
针对螺旋输送机的输送效率问题,对双轴螺旋输送机输送颗粒物料的过程进行离散元法数值计算,并与单轴螺旋输送机输送物料的试验和模拟结果进行对比。在试验验证了仿真模型和参数正确的基础上,对双轴螺旋输送机的轴距和螺距2个参数与质量流速率(■)间的定量关系进行二元二次多项式拟合,得到拟合优度R~2=0.964 6的回归方程。研究结果表明:1)双轴的相对转动方向对■没有影响;2)螺距和轴距对■均有明显影响。■随着轴距的增大显著增大,大螺距时会在达到极值后趋于稳定或略有下降;■随着螺距的增大先增大至峰值后下降;3)双轴的螺距和轴距对颗粒运动影响显著。两轴中间位置颗粒的最小轴向平动速度与轴距呈现近似线性的递减关系,且螺距越大,其减小趋势越明显。
In this study,the process of transporting granular materials by double-shaft screw conveyor was simulated with discrete element method and compared the results of experiments and simulations of single-shaft screw conveyor.Based on the accuracy validation of numerical model and parameters with experiments,the quantitive relationship between shaft distance,screw pitch and mass flow rate(■)was fitted with a binary quadratic polynomial function of the fit goodness of R~2=0.964 6.The results showed that:1)Rotating directions of two shafts did not affect the ■;2)■ was evidently influenced by shaft distance and screw pitch.■ increased with the increasing of shaft distance obviously,and it decreased after reaching the maximum value under the larger pitch.■ increased with the increasing of pitch and decreased after the maximum value.3)The behavior of the particles was influenced by the shaft distance and screw pitch.Tnd the minimum velocities of particles at the central position of the double-shaft decreased linearly as the shaft distance increased,and the decrease tendency was more obvious with larger screw pitch.
In this study,the process of transporting granular materials by double-shaft screw conveyor was simulated with discrete element method and compared the results of experiments and simulations of single-shaft screw conveyor.Based on the accuracy validation of numerical model and parameters with experiments,the quantitive relationship between shaft distance,screw pitch and mass flow rate(■)was fitted with a binary quadratic polynomial function of the fit goodness of R~2=0.964 6.The results showed that:1)Rotating directions of two shafts did not affect the ■;2)■ was evidently influenced by shaft distance and screw pitch.■ increased with the increasing of shaft distance obviously,and it decreased after reaching the maximum value under the larger pitch.■ increased with the increasing of pitch and decreased after the maximum value.3)The behavior of the particles was influenced by the shaft distance and screw pitch.Tnd the minimum velocities of particles at the central position of the double-shaft decreased linearly as the shaft distance increased,and the decrease tendency was more obvious with larger screw pitch.
引文
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[17]刘春飞,李艳洁,王玉,徐泳.U形筒螺旋输送机输送颗粒物料的离散元仿真[J].中国农业大学学报,2018,23(6):112-120Liu C F,Li Y J,Wang Y,Xu Y.Discrete element simulations on U-shape screw conveyor transporting particle materials[J].Journal of China Agricultural University,2018,23(6):112-120(in Chinese)
[18]Mindlin D R,Deresiewicz H.Elastic spheres in contact under varying oblique force[J].Applied Mechanics,1953(20):327-344
[19]Shackelford J,Alexander W.Materials Science and Engineering Handbook[M].Third Edition.Boca Raton:CRCPress LLC,2001:1567-1708
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[2]张西良,马奎,王辉,崔守娟,石云飞.颗粒尺寸对螺旋加料机定量加料性能的影响[J].农业工程学报,2014,30(5):19-27Zhang X L,Ma K,Wang H,Cui S J,Shi Y F.Effect of particle size on precision dosing of screw feeder[J].Transactions of the Chinese Society of Agricultural Engineering,2014,30(5):19-27(in Chinese)
[3]邱爱红,龚曙光.变径变螺距螺旋轴参数化模型及性能仿真[J].机械工程学报,2008,44(5):131-136Qiu A H,Gong S G.Parametric model and performance simulation on the screw conveyor of variable diameters and variable pitches[J].Chinese Journal of Mechanical Engineering,2008,44(5):131-136(in Chinese)
[4]高长银,虞正平,吴晓铃.沥青混合料保温车螺旋输送机结构设计和仿真[J].机械传动,2013,37(7):79-81Gao C Y,Yu Z P,Wu X L.Design and simulation of the screw conveyor for asphalt mixing material insulation vehicle[J].Journal of Mechanical Transmission,2013,37(7):79-81(in Chinese)
[5]Owen P J,Cleary P W.Prediction of screw conveyor performance using the discrete element method(DEM)[J].Powder Technology,2009,193(3):274-288
[6]McBride W,Cleary P W.An investigation and optimization of the‘OLDS’elevator using discrete element modeling[J].Powder Technology,2009,193(3):216-234
[7]彭飞,李腾飞,康宏彬,张国栋,孔丹丹,王红英.小型制粒机喂料器参数优化与试验[J].农业机械学报,2016,47(2):51-58Peng F,Li T F,Kang H B,Zhang G D,Kong D D,Wang H Y.Optimization and experiment on feeder for small-scale pellet mill[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):51-58(in Chinese)
[8]姚艳萍,孟文俊,廖志诚,牛帅帅.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):6-11Yao Y P,Meng W J,Liao Z C,Niu S S.Study on horizontal screw conveyors efficiency of flat bottomed bins based on EDEM simulation[J].Modern Manufacturing Engineering,2015(2):6-11(in Chinese)
[9]尹小琴,赵守明,谢俊,吕晓凤.双卧轴搅拌机搅拌臂数目的理论分析[J].武汉理工大学学报,2010,32(23):95-98Yin X Q,Zhao S M,Xie J,Lv X F.Theoretical analysis on the number of mixing arms of twin-shaft mixer[J].Journal of Wuhan University of Technology,2010,32(23):95-98(in Chinese)
[10]赵利军,冯忠绪.双卧轴搅拌机叶片排列的试验[J].长安大学学报:自然科学版,2004,24(2):94-96Zhao L J,Feng Z X.Test of blades arrangement for twin shaft mixer[J].Journal of Chang’an University:Natural Science Edition,2004,24(2):94-96(in Chinese)
[11]刘俊荣,朱赞清,俞微微,谢智芬,佟长青,薛长湖.双轴挤出机在低湿挤压过程中操作参数对系统运行稳定性的影响[J].大连水产学院学报,2005,20(2):122-127Liu J R,Zhu Z Q,Yu W W,Xie Z F,Tong C Q,Xue C H.The effects of operating parameters on running stability of a twin screw extruder[J].Journal of Dalian Fisheries University,2005,20(2):122-127(in Chinese)
[12]汪永强.新型断开螺旋双轴搅拌机优化设计方法[J].煤矿机械,2006,27(3):382-383Wang Y Q.Optimal design method of new open spiral doubleaxles mixer[J].Coal Mine Machinery,2006,27(3):382-383(in Chinese)
[13]姜奉新,尹刚.新旧冷却螺旋输送机研制的分析与对比[J].重庆工学院学报:自然科学,2003,17(5):41-42Jiang F X,Yin G.Analysis and contrast on the development of the new and old cooling conveying screws[J].Journal of Chongqing Institute of Technology:Natural Science,2003,17(5):41-42(in Chinese)
[14]陈乔松.土压平衡盾构穿越富水砂层双螺旋输送机控制喷涌技术探讨[J].广东土木与建筑,2015,22(1):44-46Chen Q S.Discussion of double screw conveyor control spewing technology in the case of earth pressure balance shield through water rich sand[J].Guangdong Architecture Civil Engineering,2015,22(1):44-46(in Chinese)
[15]江玉生,陈冬,王春河,杨志勇,刘品.土压平衡盾构双螺旋输送机力学机理简析[J].隧道建设,2007,27(6):15-18Jiang Y S,Chen D,Wang CH,Yang Z Y,Liu P.Mechanical analysis of double screw conveyors in earth pressure balance shield boring[J].Tunnel Construction,2007,27(6):15-18(in Chinese)
[16]刘春飞,李艳洁,王玉.D形截面螺旋输送机输送颗粒物料的实验研究[J].农机化研究,2017,39(8):141-146Liu C F,Li Y J,Wang Y.Experimental study on particles conveying in screw conveyor of D-shape cross section[J].Journal of Agricultural Mechanization Research,2017,39(8):141-146(in Chinese)
[17]刘春飞,李艳洁,王玉,徐泳.U形筒螺旋输送机输送颗粒物料的离散元仿真[J].中国农业大学学报,2018,23(6):112-120Liu C F,Li Y J,Wang Y,Xu Y.Discrete element simulations on U-shape screw conveyor transporting particle materials[J].Journal of China Agricultural University,2018,23(6):112-120(in Chinese)
[18]Mindlin D R,Deresiewicz H.Elastic spheres in contact under varying oblique force[J].Applied Mechanics,1953(20):327-344
[19]Shackelford J,Alexander W.Materials Science and Engineering Handbook[M].Third Edition.Boca Raton:CRCPress LLC,2001:1567-1708
[20]方昆凡.工程材料手册,黑色金属材料卷[M].北京:北京出版社,2002:34-40Fang K F.Engineering Materials Manual,Black Metal Material Volume[M].Beijing:Beijing Press,2002:34-40