螺带式混凝土搅拌机混合特性及DEM模拟

doi:10.12034/j.issn.1009-606X.218307

过程工程学报 ›› 2019, Vol. 19 ›› Issue (4): 668-675.DOI: 10.12034/j.issn.1009-606X.218307

螺带式混凝土搅拌机混合特性及DEM模拟

廖泽楚¹，高伟^1,2*，刘磊³，姜胜强¹，谭援强⁴

1. 湘潭大学机械工程学院，湖南湘潭 411105 2. 广东工业大学机电工程学院，广东广州 510006 3. 深圳市英威腾交通技术有限公司，广东深圳 518000 4. 华侨大学制造工程研究院，福建厦门 361021

收稿日期:2018-10-24 修回日期:2018-12-01 出版日期:2019-08-22 发布日期:2019-08-15
通讯作者: 高伟 hbweigao@126.com
基金资助:
基于复杂形状离散元/有限元的砂卵地层盾构仿真方法与实验研究;基于离散元/有限元耦合的高压辊磨粉碎仿真方法与实验研究;基于DEM/FEM的汽车夹层玻璃冲击破坏特性研究

Mixing efficiency of a concrete ribbon mixer and DEM simulation

Zechu LIAO¹, Wei GAO^1,2*, Lei LIU³, Shengqiang JIANG¹, Yuanqiang TAN⁴

1. School of Mechanical Engineering, Xiangtan University, Xiangtan, Hunan 411105, China 2. School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, China 3. Shenzhen Invt Transportation System Company Limited, Shenzhen, Guangdong 518000, China 4. Institute of Manufacturing Engineering, Huaqiao University, Xiamen, Fujian 361021, China

Received:2018-10-24 Revised:2018-12-01 Online:2019-08-22 Published:2019-08-15

摘要/Abstract

摘要： 采用离散单元法模拟新拌混凝土于搅拌机中的混合过程，研究了双筒螺带式混凝土搅拌机的混合效率。用Hertz-Mindlin with JKR接触方法建立新拌混凝土离散元模型，模拟了坍落度实验、L箱实验和流变仪实验，将模拟结果与实验结果进行对比，校准模型参数，采用混合系数定量研究了不同初始装填方式下搅拌机的混合效率。结果表明，采用上下装填方式时搅拌机混合效率较高；对任一初始装填方式，左部区域与右部区域、前部区域与后部区域间混合效率无明显差别，而上部区域混合效率比底部区域高，底部出料口处存在搅拌盲区，采用舍弃初始出料的方法可提高新拌混凝土性能。转速较高时混合效率较高，相同旋转圈数时，混合效率基本相同。

关键词: 离散元法, 新拌混凝土, 混合效率, 螺带式搅拌机

Abstract: The ribbon concrete mixer with double barrels is commonly used to improve the uniformity of the fresh concrete in construction industry. In order to investigate the mixing efficiency of this kind of ribbon concrete mixer, a discrete element method was used to simulate the mixing process of fresh concrete. Firstly, a discrete element model of the fresh concrete was established by using the Hertz?Mindlin with JKR contact method. The experiment processes, i.e. slump test, L box test and rheometer test were simulated by using this discrete element model and its parameters, and the simulation results were compared with the experimental ones to verify these model parameters. Afterwards, the mixing efficiencies under different initial loadings were investigated and the mixing efficiency under top?bottom loading was highest. Under each initial loading, the mixing efficiency of the fresh concrete in mixer's left region and front region was almost the same as that in their opposite regions respectively, while the mixing efficiency in the upper region was much higher than that in the lower one. Besides, a mixing blind area was found near the outlet in the bottom of the mixer, and the method of discarding the initial concrete discharge was proposed to improve the uniformity of fresh concrete. In addition, the effects of rotational speed on the mixing efficiency were investigated, and it was found that the mixing efficiency with a larger rotational speed tended to be higher. However, their mixing efficiencies were almost the same at the same rotation number of impeller. This numerical model and results provided an effective approach to solve the concrete mixing problems in industry and some scientific references for improving the mixing efficiency of a double ribbon concrete mixer.

Key words: discrete element method, fresh concrete, mixing efficiency, ribbon mixer

廖泽楚高伟刘磊姜胜强谭援强. 螺带式混凝土搅拌机混合特性及DEM模拟[J]. 过程工程学报, 2019, 19(4): 668-675.

Zechu LIAO Wei GAO Lei LIU Shengqiang JIANG Yuanqiang TAN. Mixing efficiency of a concrete ribbon mixer and DEM simulation[J]. Chin. J. Process Eng., 2019, 19(4): 668-675.

参考文献

[1]张延彬.螺带式混凝土搅拌主机参数优化研究 [D]; 山东大学, 2014.
[2]Zhang Y B, .Parameter optimization of Helical Ribbon concrete mixing mixer [D]; Shandong University, 2014
[3]曹阳, 张进生, 张延彬, 等.基于Fluent的螺带式混凝土搅拌主机数值分析[J].机械设计与制造, 2016, 2016(3):196-9
[4]Cao Y, Zhang J S, Zhang Y B, et al.Numerical Analysis of Spiral-Belt concrete mixer based on Fluent [J].Machinery Design & Manufacture, 2016, 2016(3):196-9
[5]王程霖.双螺旋轴混凝土搅拌机参数优化研究 [D]; 山东大学, 2015.
[6]Wang C L.Study on parameter optimization of double screw shaft concrete mixer [D]; Shandong University, 2015.
[7]BASINSKAS G, SAKAI M.Numerical study of the mixing efficiency of a ribbon mixer using the discrete element method [J].Powder Technology, 2016, 287(2016):380-94
[8]TAN Y, DENG R, FENG Y T, et al.Numerical study of concrete mixing transport process and mixing mechanism of truck mixer[J].Engineering Computations, 2015, 32(4):1041-65
[9]MECHTCHERINE V, GRAM A, KRENZER K, et al.Simulation of fresh concrete flow using Discrete Element Method (DEM): theory and applications[J].Materials & Structures, 2014, 47(4):615-30
[10]DENG R, TAN Y, ZHANG H, et al.Numerical study on the discharging homogeneity of fresh concrete in truck mixer: effect of motion parameters[J].Particulate Science & Technology, 2018, 36(2):146-153
[11]小原孝之.材料拌和离散元模拟系统的开发与应用 [D]; 清华大学, 2007.
[12]Xiao Y X Z.Development and application of material mixing discrete element simulation system[D]; Tsinghua University, 2007.
[13]邓熔.搅拌车中混凝土流变性研究及应用 [D]; 湘潭大学, 2016.
[14]Deng R.Study and application of concrete rheology in mixing trucks[D]; Xiangtan University, 2016.
[15]汪东波.高性能混凝土的流变性及泵送压力损失研究 [D]; 重庆大学, 2015.
[16]Wang D B.Study on Rheology and Pumping pressure loss of High-performance Concrete[D]; Chongqing University, 2015.
[17]CUNDALL P A.A computer model for simulating progressive,large-scale movements in blocky rock systems[J].Procintsympon Rock Fracture, 1971, 1(ii-b):11-8
[18]高伟, 臧孟炎.基于内聚力模型的夹层玻冲击破坏过程仿真[J].华南理工大学学自然科学版, 2013, 41(5):139-44
[19]Gao W, Zang M Y.Simulation of impact fracture process of laminated glass beam based on cohesive model[J].Journal of south China university of Technology (Natural Science Edition), 2013, 41(5):139-44
[20]MINDLIN R D.Compliance of Elastic Bodies in Contact[J].Japplmech, 1949, 16(3):259-68
[21]JOHNSON K L, KENDALL K, ROBERTS A D.Surface Energy and the Contact of Elastic Solids[J].Procrsoclonda, 1971, 324(1558):301-13

螺带式混凝土搅拌机混合特性及DEM模拟

Mixing efficiency of a concrete ribbon mixer and DEM simulation

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 2

编辑推荐

Metrics

[1]	龚曙光廖明卢兴福左志坚刘克俭. 基于液桥效应圆筒制粒机的铁矿粉制粒机理研究[J]. 过程工程学报, 2022, 22(2): 232-239.
[2]	朱桂华张丽欣马凯王万斌. 错位桨搅拌槽内污泥与固体颗粒混合过程的数值模拟[J]. 过程工程学报, 2016, 16(3): 402-406.