Experimental study on the effect of vibrating filler auxiliary medium on micro powder filling process
-
摘要: 对矿石成分做光谱分析时需将矿粉紧实地填充到实验碳棒中，为增强填充效果，本文提出添加辅助介质的二维振动填料法对微粉进行填充，运用离散单元法建立微粉力学接触模型，通过EDEM软件构建微粉颗粒模型并对填充过程进行仿真模拟。选用玛瑙球作为辅助介质，在参考振动填料法主要参数（振动频率和振动时间）的基础上，利用仿真模型模拟了颗粒尺寸为50~150 μm矿粉微粒混合物的填充过程（填充空腔体积1 cm3），其中振动频率为60~80 Hz，振动时间为10~15 s；分析了振动频率、振动时间等影响因素对微粉填充率和填充密度的影响规律，并采用自制实验台对仿真模型进行了振动填料实验验证。结果表明：加入辅助介质的振动填料填充紧实，填充质量可满足实验需要，为其他粉体填料提供借鉴和参考。Abstract: In the spectral analysis experiments of ore composition, the ore powders should be tightly filled into the test carbon rod. To enhance the filling effect of micro powders, the two-dimensional vibrating filler method added by auxiliary medium was introduced for filling and compacting. The mechanical contact model of micro-powders was established by discrete element method, and the particle model of micro-powders was constructed and simulation by EDEM software. By considering the main parameters of vibration packing (vibration frequency and vibration time), the two-dimensional vibrating filling process of the mixture ore powders in the particle sizes of 50~150 μm was simulated by using agate ball as the auxiliary medium in the cavity volume of 1 cm3, when the vibration frequency was 60~80 Hz and the vibration time was 10~15 s; the influencing factors of vibration frequency and vibration time on the filling rate and packing density of micro-powders were analyzed and discussed; finally, the simulation was verified by vibratory packing experiment in the self-made table. The results show that the filling material is compacted in two-dimensional vibrating filler method added by auxiliary medium, and the filling quality can meet the test requirements. The validity of simulation model is verified by experiment, providing a reference for other powder fillers.
-
Key words:
- vibrating filler /
- micro powders /
- auxiliary medium /
- filling rate /
- simulation
-
图 1 微粉填充示意图：（a）二维振动填料结构图；（b）坩埚运动示意图
Figure 1. Micro powder filling schematic: (a) two-dimensional vibrating filler method; (b) crucible motion diagram
图 2 接触理论中颗粒间接触示意图：（a）黏连作用下颗粒表面所在位置；（b）颗粒接触面直径
Figure 2. Schematic diagram of particle contact in contact theory: (a) particle surface position in adhesion force; (b) contact surface diameter of particles
图 3 矿粉和催化剂颗粒仿真模型（粒度50~150 μm）
Figure 3. Simulation model of ore powders and catalyst particles (particle size 50~150 μm)
图 4 辅助介质仿真模型（玛瑙球，粒度6 mm）
Figure 4. Simulation model of auxiliary medium particles (agate ball, particle size 6 mm)
图 5 微粉颗粒及玛瑙球速度分布情况：（a）0 s；（b）1 s
Figure 5. Velocity distribution of particles and agate balls: (a) 0 s; (b) 1 s
图 6 振动填料7 s时颗粒状态示意图
Figure 6. Schematic diagram of particle state at vibration filling for 7 s
图 7 不同振动频率条件下碳棒内矿粉填充效果（振幅3 mm、振动时间10 s）：（a）60 Hz；（b）70 Hz
Figure 7. Filling effect of ore powders in carbon rod by different vibration frequency (vibration amplitude 3 mm and vibration time 10 s): (a) 60 Hz; (b) 70 Hz
图 8 振动频率与粉末颗粒填充密度的关系
Figure 8. Relationship between vibration frequency and powder particle filling density
图 9 振动时间与粉末颗粒填充密度的关系
Figure 9. Relationship between vibration time and powder particle filling density
表 1 矿粉、催化剂、玛瑙球颗粒以及坩埚材料参数
Table 1. Parameters of ore powders, catalyst, agate ball particles, and crucible materials
材料 密度/(g·cm-3) 维氏硬度，HV 泊松比 弹性模量/MPa 抗压强度/MPa 抗拉强度/MPa 矿粉 4.32~4.45 600 0.30 210 1620 120 催化剂 4.26~4.42 450 0.25 190 1580 100 玛瑙球 2.23~2.65 700 0.20 180 1700 130 坩埚 2.22~2.35 650 0.23 100 222 500 
下载: 导出CSV
表 2 颗粒接触参数
Table 2. Particle contact parameters
材料 弹性恢复系数 静摩擦系数 动摩擦系数 矿粉–矿粉 0.3 0.545 0.010 矿粉–催化剂 0.3 0.634 0.010 催化剂–催化剂 0.3 0.589 0.010 矿粉–坩埚 0.3 0.300 0.010 催化剂–坩埚 0.3 0.634 0.010
下载: 导出CSV
表 3 颗粒生成基本参数
Table 3. Basic parameters of particles generation
材料 生成总质量/g 生成数量/个 起始时间/s 矿粉 5 106~107 0.1 催化剂 2 0.4×106~0.4×107 0.1 玛瑙球 2.5 1 0.5
下载: 导出CSV
-
[1] Zhao Y Z, Jiang M Q, Zheng J Y. Discrete element simulation of the segregation in Brazil nut problem. Acta Phys Sin, 2009, 58(3): 1812 doi: 10.3321/j.issn:1000-3290.2009.03.068赵永志, 江茂强, 郑津洋. 巴西果效应分离过程的计算颗粒力学模拟研究. 物理学报, 2009, 58(3): 1812 doi: 10.3321/j.issn:1000-3290.2009.03.068 [2] Jiang Z H, Lu K Q, Hou M Y, et al. Sandwich-like segregation in vertically vibrated binary granular mixtures. Acta Phys Sin, 2003, 52(9): 2244 doi: 10.3321/j.issn:1000-3290.2003.09.027姜泽辉, 陆坤权, 厚美瑛, 等. 振动颗粒混合物中的三明治式分离. 物理学报, 2003, 52(9): 2244 doi: 10.3321/j.issn:1000-3290.2003.09.027 [3] Zhang F W, Wang L, Liu C P, et al. The rising motion of grains in a vibrating pipe. Acta Phys Sin, 2014, 63(1): 014501 https://www.cnki.com.cn/Article/CJFDTOTAL-WLXB201401031.htm张富翁, 王立, 刘传平, 等. 竖直振动管中颗粒的上升运动. 物理学报, 2014, 63(1): 014501 https://www.cnki.com.cn/Article/CJFDTOTAL-WLXB201401031.htm [4] Zhao L L, Liu C S, Yan J X, et al. Numerical simulation of particle segregation behavior in different vibration modes. Acta Phys Sin, 2010, 59(4): 2582 https://www.cnki.com.cn/Article/CJFDTOTAL-WLXB201004064.htm赵啦啦, 刘初升, 闫俊霞, 等. 不同振动模式下颗粒分离行为的数值模拟. 物理学报, 2010, 59(4): 2582 https://www.cnki.com.cn/Article/CJFDTOTAL-WLXB201004064.htm [5] Kong W S, Hu L, Mei B, et al. Convection flow in 2D vertically oscillated granular layers. Phys Exp, 2007, 27(6): 18 doi: 10.3969/j.issn.1005-4642.2007.06.005孔维姝, 胡林, 梅波, 等. 竖直振动激励下的准二维容器中颗粒物质的对流运动. 物理实验, 2007, 27(6): 18 doi: 10.3969/j.issn.1005-4642.2007.06.005 [6] Wang Z Y, Zhou W, Yang L F, et al. Numerical simulation of the microscopic mechanism of the particle separation under the condition of horizontal vibration. J Vibr Shock, 2016, 35(16): 24 https://www.cnki.com.cn/Article/CJFDTOTAL-ZDCJ201616005.htm王振宇, 周伟, 杨利福, 等. 水平振动情况下颗粒系统振动分离机理的离散元数值研究. 振动与冲击, 2016, 35(16): 24 https://www.cnki.com.cn/Article/CJFDTOTAL-ZDCJ201616005.htm [7] Liu Y. Segregation Behavior of Particles under Vertical Pendulum Vibration [Dissertation]. Anshan: University of Science and Technology Liaoning, 2016刘莹. 垂直摆振下物料颗粒的分层行为研究[学位论文]. 鞍山: 辽宁科技大学, 2016 [8] Guo C R. Study on the Separation Phenomena and Formation Mechanism of Granular Materials in Vibration Environment [Dissertation]. Guiyang: Guizhou University, 2006郭长睿. 颗粒物质在振动环境中的分离现象及形成机理研究[学位论文]. 贵阳: 贵州大学, 2006 [9] Wu J. Segregation and Convection in Vibrated Granular Beds [Dissertation]. Harbin: Harbin Institute of Technology, 2007吴晶. 振动颗粒的分离与对流[学位论文]. 哈尔滨: 哈尔滨工业大学, 2007 [10] Fan S W, Xu Y D, Zhang L T, et al. Effect of vibration frequency and time on packed density of powder. Refractory, 2005, 39(2): 123 doi: 10.3969/j.issn.1001-1935.2005.02.013范尚武, 徐永东, 张立同, 等. 振动频率和振动时间对粉料填充密度的影响. 耐火材料, 2005, 39(2): 123 doi: 10.3969/j.issn.1001-1935.2005.02.013 [11] Liang Z H, Liu Q Z, Ma L, et al. Simulation on filling density of titanium powder in vibration forming based on EDEM. Powder Metall Ind, 2017, 27(4): 31 https://www.cnki.com.cn/Article/CJFDTOTAL-FMYG201704010.htm梁增华, 刘邱祖, 马麟, 等. 基于EDEM的钛粉在振动成形中的填充密度模拟研究. 粉末冶金工业, 2017, 27(4): 31 https://www.cnki.com.cn/Article/CJFDTOTAL-FMYG201704010.htm [12] Liu B, Ma L, Liu Q Z, et al. Effect of vibration performance on packing density of NdFeB magnet powder base on EDEM. China Powder Sci Technol, 2017, 23(4): 72 https://www.cnki.com.cn/Article/CJFDTOTAL-FTJS201704016.htm刘波, 马麟, 刘邱祖, 等. 基于EDEM的振动特性对钕铁硼永磁粉体填充密度的影响. 中国粉体技术, 2017, 23(4): 72 https://www.cnki.com.cn/Article/CJFDTOTAL-FTJS201704016.htm [13] Liu Q Z, Ma L, Dong K K, et al. EDEM simulation research on effect of vibration characteristic on particle mixing uniformity. China Powder Sci Technol, 2017, 23(4): 27 https://www.cnki.com.cn/Article/CJFDTOTAL-FTJS201704006.htm刘邱祖, 马麟, 董凯凯, 等. 振动特性对颗粒混合均匀性影响的EDEM模拟. 中国粉体技术, 2017, 23(4): 27 https://www.cnki.com.cn/Article/CJFDTOTAL-FTJS201704006.htm [14] Tao M, Xu H J. Texture, water content and formation mechanism of agate. Acta Petrol Miner, 2016, 35(2): 333 doi: 10.3969/j.issn.1000-6524.2016.02.013陶明, 徐海军. 玛瑙的结构、水含量和成因机制. 岩石矿物学杂志, 2016, 35(2): 333 doi: 10.3969/j.issn.1000-6524.2016.02.013 [15] Sun Q C, Wang G Q. Introduction to the Mechanics of Granular Matter. Beijing: Science Press, 2009孙其诚, 王光谦. 颗粒物质力学导论. 北京: 科学出版社, 2009 [16] Wang G Q, Hao W J, Wang J X. Discrete Element Method and its Practice on EDEM. Xi'an: Northwest Polytechnic University Press, 2010王国强, 郝万军, 王继新. 离散单元法及其在EDEM上的实践. 西安: 西北工业大学出版社, 2010 -
点击查看大图
计量
- 文章访问数: 310
- HTML全文浏览量: 100
- PDF下载量: 15
- 被引次数: 0
