共查询到19条相似文献,搜索用时 140 毫秒
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一种新型振动筛的研制与应用 总被引:1,自引:0,他引:1
介绍了BHS大型直线筛的结构、原理及特点。该筛筛板振动而筛箱不振动.通过大振幅、大振动强度和弹性筛面,满足了振动机械和潮湿细粒级粘性物料的筛分要求,并使筛分设备的大型化成为可能。 相似文献
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介绍了BHS大型直线筛的结构、原理及特点。该筛筛板振动而筛箱不振动,通过大振幅、大振动强度和弹性筛面,满足了振动机械要求和潮湿细粒级粘性物料的筛分规律,并使筛分设备的大型化成为可能。 相似文献
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两自由度弹性筛面筛分机设计和试验研究 总被引:1,自引:0,他引:1
利用弹性筛面筛分理论,分析现有的几种难筛物料筛分机的优点和存在的问题,提出了一种新型双自由度弹性筛面筛分机.研究了该新型双自由度弹性筛面筛分机的动力学模型,给出新型双自由度弹性筛面筛分机的参数设计公式.研究了双自由度弹性筛面筛分机的机械结构形式和零件的参数选取范围,给出模型机的示意图,在GS概率筛基础上设计一种改良的双自由度弹性筛面概率筛——TGS概率筛,最后进行了实验室的半工业性试验.试验结果表明:TGS概率筛具有良好的克服堵孔能力,对处理难筛物料的深度筛分具有较高的筛分效率. 相似文献
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双鸭山矿务局七星矿过去原煤采用GS概率筛筛选,生产不同产品。由于原煤水分达13%左右,所以筛分效率低。现在该矿将GS概率筛筛面改制成琴弦筛筛面,大大改善筛分效果,取得了一定的经济效益和社会效益。 相似文献
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基于三维离散元法(DEM)对新型变振幅等厚筛6 mm筛分过程进行仿真研究。采用分段分析方法,以可能偏差Epm为主要评价指标,调节筛面结构,揭示筛分性能对筛面参数的响应规律。结果表明,在稳态等厚筛分过程中,当尺寸梯度D=1.0 mm、筛孔尺寸均值为7.5 mm、开孔率组合为35%-35%-40%时,分配粒度最接近6 mm,且其可能偏差最小(Epm=0.873 mm),筛分效果达到最佳。本研究通过探索变振幅等厚筛筛面结构,调控物料透筛行为,提升等厚筛分效果,对选煤用变振幅等厚筛设计和优化具有一定的借鉴意义。 相似文献
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新型弹性筛面筛分机动力学模型及参数设计研究 总被引:1,自引:0,他引:1
根据弹性筛面筛分理论,分析了现有的几种弹性筛面筛分机的优点和存在的问题,提出了一种新型两自由度弹性筛面筛分机,研究了该筛分机的动力学模型,给出了新型双自由度弹性筛面筛分机的参数设计公式及其参数取值。研究了两自由度弹性筛面筛分机的机械结构实现方法和零件的参数选取范围。 相似文献
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《Minerals Engineering》2002,15(1-2):7-17
This paper describes a model which makes it possible to predict the transport velocity of a crushed rock material bed along an ordinary screen with a circular stroke. Transport velocity can be predicted with respect to the inclination, stroke and frequency of the screen. The model is based on physical laws. A particle leaves the screen surface when the negative vertical acceleration of the screen surface exceeds that of the particle. The particle can also slide along the screen surface. Monte Carlo simulation is used to estimate the influence of the other particles. Thus, random values are used to simulate the collisions between particles. The predicted transport velocity is equal to the average transport velocity from a few runs with the model. To verify the model, experiments were made: the transport velocity of a bed of crushed rock particles along a wire cloth was measured for different inclinations, strokes and frequencies. The predictions made with the model agreed well with the experimental results.A model which makes it possible to predict the size distribution of both the remaining and the passed material on a screen with several interacting screen planes has already been presented by the author. In addition, it is necessary to know the transport velocity of the material to be able to estimate the bed thickness and the capacity of the screening process. 相似文献
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《Minerals Engineering》1999,12(5):497-516
The customers of the aggregate producing industry want a reduction of misplaced material, which puts heavy demands upon the suppliers. Misplaced material consists of particles below the separation limit remaining in the coarse fraction and coarse particles in the fine fraction. To minimise these problems, it is necessary to have a fundamental understanding of the screening process.There are two simultaneous processes to consider during screening, stratification and passage of particles through the apertures in the screen surface. The purpose of this article is to provide a physical explanation showing how the rate of stratification and the rate of passage vary along the screen. The interrelation of the two processes is described in the flow model presented here. The rate of stratification varies with the proportion of fine material and the ratio of the sizes of the particles. The rate of passage depends on the probability that the particles will pass through the apertures and on the amount of fine material on the screen surface. When the whole screen surface is covered with fine material, the rate of passage reaches a maximum.The model has been implemented in a calculation program. The general outcome of the calculations is in accordance with experiments. 相似文献
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以煤炭筛分存在的问题为背景,深入分析了筛分在煤炭洗选加工的作用,对近年来煤炭筛分研究和应用中的热点和难点问题进行了回顾。首先对概率筛分原理,等厚筛分原理,驰张筛分原理,弹性筛分原理,强化筛分原理进行了总结,介绍了颗粒运动学和筛分模型的新进展;其次对潮湿煤炭深度筛分堵孔机理和概率筛、强化筛、弹性杆振动筛、驰张筛、梯流筛、气流筛等深度筛分设备的研制和应用作了系统的阐述,指出了进行潮湿煤炭深度筛分设备研究和应用的必要性;最后对大型振动筛在国内外的研制现状进行综述,指出国产大型振动筛存在可靠性差的问题,提出研究新的筛分理论、发展物理方法来减轻颗粒粘附难题,使用动态分析技术、创造新的结构解决国产大型振动筛可靠性差的问题。 相似文献
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对提高ZD型直线等厚筛处理能力提出了将筛面分成多段,可降低物料层高度,使筛孔透筛能力增强;合理分配参数,强化筛分过程;增大筛面倾角,提高物料运动速度等问题进行了探讨,并在实际中进行了验证。 相似文献
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弛张筛筛面动态特性及其筛分理论研究 总被引:1,自引:0,他引:1
为研究弛张筛面动态特性参数沿筛面长度方向分布状况和大振动强度筛分理论,建立了弛张筛筛面的非线性动力学方程,采用摄动方法求出解,导出了筛面动态特性沿筛长方向的分布规律及其精确表达式,理论分析结果与实测结果符合很好.利用Holms弹跳球模型来模拟单颗粒在筛面上的运动并找出数值结果,发现单颗粒物料在筛面上运动时,筛面振动强度kv>167颗粒产生混沌运动,修正了定常运动论的kv=33的理论.最后在弛张筛模型机上进行筛分试验,得出弛张筛能有效地进行潮湿原煤的干法深度筛分. 相似文献