Experimental study on the effect of vibrating filler auxiliary medium on micro powder filling process
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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.
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Key words:
- vibrating filler /
- micro powders /
- auxiliary medium /
- filling rate /
- simulation
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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 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 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 -
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