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Influence of vibration mode on the screening process

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International Journal of Mining Science and Technology 2013年第1期23卷 95-98页

作者： Dong Hailin Liu Chusheng zhao Yuemin zhao lala School of Mechanical and Electrical Engineering China University of Mining & Technology Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization of Ministry of Education School of Chemical Engineering and Technology China University of Mining & Technology

The screening of particles with different vibration modes was simulated by means of a 3D discrete element method (3D-DEM). The motion and penetration of the particles on the screen deck were analyzed for linear, circular and elliptical vibration of the screen. The results show that the travel velocity of the particles is the fastest, but the screening efficiency is the lowest, for the linear vibration mode. The circular motion resulted in the highest screening efficiency, but the lowest particle travel velocity. In the steady state the screening efficiency for each mode is seen to increase gradually along the longitudinal direction of the deck. The screening efficiency increment of the circular mode is the largest while the linear mode shows the smallest increment. The volume fraction of near-mesh size particles at the underside is larger than that of small size particles all along the screen deck. Linear screening mode has more near-mesh and small size particles on the first three deck sections, and fewer on the last two sections, compared to the circular or elliptical modes.

关键词： Vibration mode Screening process Particles Discrete element method

A virtual experiment showing single particle motion on a linearly vibrating screen-deck

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Mining Science and Technology 2010年第2期20卷 276-280页

作者： zhao, lala LIU, Chusheng YAN, Junxia school of mechanical and electrical engineering china university of mining & technologyxuzhou 221008china

A virtual sieving experimental simulation system was built using physical simulation *** effects of vibration frequency and amplitude,the inclination angle of the screen-deck and the vibration direction angle of screen on single particle kinematics were *** such as the average velocity and the average throw height were *** results show that the amplitude and the angle of vibration have a great effect on particle average velocity and average *** vibration frequency and the screen-deck inclination angle appear to have little influence on these *** materials that are difficult to screen the vibration frequency and amplitude,the screen-deck inclination angle and the vibration angle should be set to 14 Hz,6.6 mm,6° and 40°,respectively,to obtain optimal particle kinematics.A screening process can be simulated reliably by means of a virtual experiment and these results provide references for both screening theory research and sieving practice.

关键词： linear vibrating screen kinematics parameters single particle throwing motion virtual experiment

DEM simulation of particle flow on a single deck banana screen

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International Journal of Mining Science and Technology 2013年第2期23卷 277-281页

作者： Liu Chusheng Wang Hong zhao Yuemin zhao lala Dong Hailin School of Mechanical and Electrical Engineering China University of Mining & Technology Key Laboratory of Coal Processing and High Efficient Cleaning & Utilization of Ministry of Education School of Chemical Engineering and Technology China University of Mining & Technology

A mathematical study of particle flow on a banana screen deck using the discrete element method (DEM) was presented in this paper. The motion characteristics and penetrating mechanisms of particles on the screen deck were studied. Effects of geometric parameters of screen deck on banana screening process were also investigated. The results show that when the values of inclination of discharge and increment of screen deck inclination are 10° and 5° respectively, the banana screening process get a good screening performance in the simulation. The relationship between screen deck length and screening efficiency was further confirmed. The conclusion that the screening efficiency will not significantly increase when the deck length L≥430 mm (L/B ≥ 3.5) was obtained, which can provide theoretical basis for the optimization of banana screen.

关键词： Banana screen Particle flow Discrete element method Numerical simulation

Simulation of the screening process on a circularly vibrating screen using 3D-DEM

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Mining Science and Technology 2011年第5期21卷 677-680页

作者： zhao lala zhao Yuemin Liu Chusheng Li Jun Dong Hailin School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou 221116 China Key Laboratory of Coal Processing and High Efficient Cleaning ＆ Utilization of Ministry of Education Xuzhou 221008 China School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221116 China

A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of vibration amplitude, throwing index, and screen deck inclination angle on the screening process are discussed. The results show that the average velocity of the particles increases along the lon- gitudinal direction of the deck. The screening efficiency is highest when the vibration amplitude, throw- ing index, and screen deck inclination angle are 3-3.5 mm, 2.7 and 15°, respectively. This work is helpful for developing a deep understanding of particle motion and for optimizing screen separator designs.

关键词：三维离散单元法数字高程模型屏幕振动利用筛选粒子运动模拟抛掷指数

湿黏细粒煤干法筛分理论及交叉筛技术发展现状

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煤炭科学技术 2022年第10期50卷 251-258页

作者：赵啦啦江海深赵跃民段晨龙李允旺刘初升中国矿业大学机电工程学院江苏徐州221116 中国矿业大学化工学院江苏徐州221116

湿黏细粒煤的干法深度筛分理论与技术是当前国际筛分领域的研究热点和难点。其中,筛面易堵孔和筛面寿命短是湿黏细粒煤干法筛分时的核心基础问题。为了掌握当前湿黏细粒煤干法筛分理论及技术的发展现状,分析了2种广泛应用的细粒煤筛分设... 详细信息

湿黏细粒煤的干法深度筛分理论与技术是当前国际筛分领域的研究热点和难点。其中,筛面易堵孔和筛面寿命短是湿黏细粒煤干法筛分时的核心基础问题。为了掌握当前湿黏细粒煤干法筛分理论及技术的发展现状,分析了2种广泛应用的细粒煤筛分设备:基于等厚筛分理论的等厚筛和基于弛张筛分理论的弛张筛的应用及研究存在的问题,讨论了筛分过程基础理论中颗粒分离机理的研究现状,总结了基于离散元方法(DEM,Discrete Element Method)的筛分过程中有关筛面颗粒流动特性数值模拟研究存在的不足。结果表明:筛分过程基础理论是发展新筛分技术和提升筛分设备设计水平的关键,非球形湿黏颗粒系统的分离行为和筛面高湿黏颗粒流动特性及透筛机理是筛分过程基础理论的关键问题,利用基于DEM的数值方法可以实现从颗粒尺度深入研究筛分过程中非球形湿黏颗粒的有关运动行为。此外,阐述了交叉筛的结构特点及筛分过程机理,总结了国内外有关交叉筛技术的应用及研究现状,分析了交叉筛的筛分过程基础理论研究的不足,以及存在缺少交叉筛关键结构及工艺参数的优化设计理论和方法的主要问题,提出了基于筛面-颗粒耦合模拟的交叉筛分过程机理、交叉筛结构轻量化设计及节能优化控制等研究展望。

关键词：湿黏细粒煤干法筛分筛分机理交叉筛离散元方法

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用于筛分高湿黏细粒煤的交叉筛研究现状

煤炭技术 2022年第12期41卷 244-246页

作者：赵啦啦孟昂祝震丰季思齐赵举龙中国矿业大学机电工程学院江苏徐州221116

介绍了一种极具应用前景的深度干法筛分设备——交叉式细粒滚轴筛,并综述了交叉筛的研究现状,指出目前国内有关交叉筛的研究多为应用研究和基于经验的结构设计研究,缺少有关的基础筛分理论研究,制约了交叉筛的发展。总结了有关的筛分过... 详细信息

介绍了一种极具应用前景的深度干法筛分设备——交叉式细粒滚轴筛,并综述了交叉筛的研究现状,指出目前国内有关交叉筛的研究多为应用研究和基于经验的结构设计研究,缺少有关的基础筛分理论研究,制约了交叉筛的发展。总结了有关的筛分过程模拟研究概况,为交叉筛的筛分理论研究提供了参考依据。探讨了变频调速技术及有关的节能控制方法,为实现交叉筛的节能优化控制提供了理论依据。

关键词：高湿黏细粒煤交叉筛离散元法筛分机理节能控制

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交叉筛技术及模拟优化设计研究现状

煤炭技术 2023年第11期42卷 191-193页

作者：祝震丰赵啦啦孟昂王宏都中国矿业大学机电工程学院江苏徐州221116 玉溪大红山矿业有限公司云南玉溪653110

交叉筛是一种用于潮湿细粒物料干法深度筛分并且具有广泛应用前景的新型筛分设备。目前,有关交叉筛技术的研究主要是应用研究,缺少对交叉筛技术及设计方法的基础理论研究。基于此,对交叉筛技术及模拟优化设计的研究现状进行了综述,介绍... 详细信息

交叉筛是一种用于潮湿细粒物料干法深度筛分并且具有广泛应用前景的新型筛分设备。目前,有关交叉筛技术的研究主要是应用研究,缺少对交叉筛技术及设计方法的基础理论研究。基于此,对交叉筛技术及模拟优化设计的研究现状进行了综述,介绍了交叉筛的结构特点及筛分过程原理,并且针对普通干法筛分设备易出现的筛面堵孔、糊孔等问题,详细阐述了交叉筛“动态筛孔”防堵孔机制。此外,介绍了基于离散元法(DEM)的筛分过程模拟优化设计方法,分析了滚轴筛、振动筛以及联合仿真的筛分过程模拟优化设计现状,提出了交叉筛的筛分基础理论、关键零部件优化设计等研究展望。

关键词：交叉筛模拟优化设计离散元法筛分机理

机械领域“工程伦理”教学改革研究与混合教学模式实践

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科教导刊 2023年第27期 101-103页

作者：赵啦啦刘新华韩静中国矿业大学机电工程学院江苏徐州221116

文章在总结目前机械领域工程伦理研究和教育现状的基础上,开展了机械领域典型教学案例研究及工程伦理解析,研究了工程伦理相关的基本理论注入教学案例的方式及呈现方法。此外,文章开展了案例式与翻转课堂相结合的混合教学模式研究,开展... 详细信息

文章在总结目前机械领域工程伦理研究和教育现状的基础上,开展了机械领域典型教学案例研究及工程伦理解析,研究了工程伦理相关的基本理论注入教学案例的方式及呈现方法。此外,文章开展了案例式与翻转课堂相结合的混合教学模式研究,开展了混合教学模式实践,探索工程伦理思维的高效注入以及启发式与探索式相融合的实践策略。所得成果有助于机械类专业学生深入理解有关工程伦理规范和提高工程伦理的决策能力。

关键词：机械领域工程伦理教学改革案例研究混合教学

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基于大创项目的学生创新创业能力培养机制研究和实践

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科教导刊 2023年第29期 27-29页

作者：赵啦啦刘新华邹筱瑜中国矿业大学机电工程学院江苏徐州221116

文章概述了大学生创新创业能力培养机制的研究背景和意义,分析了"大学生创新创业训练计划"(大创项目)、学生主体和培养模式所面临的问题和挑战,阐述了基于大创项目的学生创新创业能力的研究方案和培养机制,并通过案例总结了实施效果.文... 详细信息

文章概述了大学生创新创业能力培养机制的研究背景和意义,分析了"大学生创新创业训练计划"(大创项目)、学生主体和培养模式所面临的问题和挑战,阐述了基于大创项目的学生创新创业能力的研究方案和培养机制,并通过案例总结了实施效果.文章开展的基于大创项目的学生创新创业能力培养机制研究和实践,为开拓学生创新创业思维、激发学生创新创业潜能提供了有益的参考.

关键词：大创项目创新创业能力创新创业课程培养机制

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