| 摘要: |
| 目的 为研究振动筛的筛分参数对振动筛筛分效率的影响以及筛分颗粒在筛分过程中的运动规律,对振动 筛进行参数优化设计。 方法 首先建立振动筛的三维模型,使用离散元分析软件 EDEM 对振动筛的筛分过程进行 模拟仿真并使用正交试验法设计了多组振动筛筛分试验,通过离散单元法分析了振动筛的振幅、振动频率和振动 方向角三个运动学参数对筛分效率的影响。 对正交试验结果进行多元非线性拟合,在拟合函数的基础上使用蚁群 算法寻找最佳筛分效率对应的振动参数值。 结果 振动频率增大会导致颗粒在筛箱中跳动次数过大,颗粒一直处于 跳起状态,颗粒通过筛孔的概率降低,使筛分效率下降。 振频对筛分效率的影响与振幅相似,随着振频的增大,筛 面抖动加剧,对颗粒的作用力增大,颗粒在空中的时间增加,导致颗粒进入筛孔的机率减小,筛分效率下降。 振动 方向角增大时,筛分效率呈先增后减趋势,方向角过小时,颗粒朝几乎平行于筛网的方向弹出,与筛网总接触时间 减小,透过筛孔的砂粒减小,方向角过大时,颗粒垂直于筛面弹出,筛分速度变慢,颗粒容易在筛面上堆积,可透过 筛孔的颗粒在筛分过程中与筛面接触的机会减小,最终透过筛孔的颗粒减少,筛分效率下降。 结论 当振幅为 2 mm,振频为 18 Hz,振动方向角为 44°时,振动筛的筛分效果最佳,此研究对振动筛的优化设计具有一定指导意义。 |
| 关键词: 振动筛 离散单元法 EDEM 筛分效率 蚁群算法 |
| DOI： |
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| 基金项目: |
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| Optimization Design of Vibrating Screen Parameters Based on Ant Colony Algorithm |
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LI Yueting, ZHANG Zhenshan, WANG Zhenwei
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School of Mechanical and Automotive Engineering Shanghai University of Engineering Science Shanghai 201620 China
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| Abstract: |
| Objective In order to study the effect of the screening parameters of the vibrating screen on the screening efficiency of the vibrating screen and the motion law of the screening particles in the screening process the parameters of the vibrating screen were optimized. Methods A three-dimensional model of the vibrating screen was established the screening process of the vibrating screen was simulated by using discrete element analysis software EDEM and multiple groups of vibrating screen screening tests were designed by using the orthogonal test method. The effect of the three kinematic parameters of the vibrating screen namely amplitude vibration frequency and vibration direction angle on the screening efficiency was analyzed by the discrete unit method. Multivariate nonlinear fitting was performed on the orthogonal test results and the ant colony algorithm was used to find the vibration parameters corresponding to the optimal screening efficiency based on the fitting function. Results The results showed that the increase in vibration frequency led to the excessively large beating times of particles in the screening box and the particles were always in the bouncing state which reduced the probability of particles passing through sieve holes and the screening efficiency. The influence of vibration frequency on screening efficiency was consistent with that of amplitude. With the increase of vibration frequency the jitter of the screen surface was intensified the force on particles was increased and the time of particles in the air was increased which led to the decrease in the probability of particles entering the sieve holes and the decrease of screening efficiency. When the vibration direction angle increased the screening efficiency increased first and then decreased.When the direction angle was too small the particles popped out in the direction almost parallel to the screen the total
contact time with the screen decreased and the sand particles passing through the sieve holes decreased. When the
direction angle was too large the particles popped perpendicular to the sieve surface the screening speed became slower
the particles tended to accumulate on the sieve surface and the chance of contact between the particles that could pass
through the sieve holes and the sieve surface decreased during the screening process. Finally the particles passing
through the sieve holes were reduced and the screening efficiency decreased. Conclusion When the amplitude is 2 mm
the frequency is 18 Hz and the vibration direction angle is 44° the screening effect of the vibrating screen is the best.
This study has a certain guiding significance for the optimization design of the vibrating screen. |
| Key words: vibrating screen discrete element method DEM EDEM screening efficiency ant colony algorithm |
