常温下聚四氟乙烯的湍流超细粉碎研究

为探讨湍流粉碎机对塑料进行超细粉碎的机理,利用湍流粉碎机对聚四氟乙烯进行常温超细粉碎的试验。通过试验,对主要粉碎参数如转速、入料粒度和入料速度对粉碎效果的影响进行分析。结果表明:在适宜的参数条件下,湍流粉碎机对聚四氟乙烯进行常温超细粉碎的粒度可以达到d5012μm,同时分析聚四氟乙烯在湍流场中进行超细粉碎的机理。     

湍流超细粉碎机粉碎腔内单相流场的数值模拟

为了认识湍流超细粉碎机粉碎腔内的流场结构和流动状态,文中以湍流超细粉碎机的实验设备为基础,利用Pro/Engineer软件建立了计算模型,并借助先进的CFD技术,以标准紊流模型和SIM-PLEC算法,数值模拟了湍流超细粉碎机粉碎腔内的单相三维紊流定常流场,直观显示了粉碎腔内的速度、总压和流线等特性,为粉碎腔内的流场结构提供了直观的模拟结果。     

湍流超细粉碎机粉碎腔内流场的数值模拟

为了认识粉碎腔内的流场结构和流动状态,提高粉碎设备的加工效果,本文中根据湍流超细粉碎机的实验设备,建立了单曲率叶型的曲线方程,并借助先进的CFD技术,在FLUENT软件中,对用Pro/ENGINEER建立的计算模型进行了验证,模拟了两种不同叶型时湍流超细粉碎机粉碎腔内的单相三维紊流定常流场,直观显示了粉碎腔内的速度分布特性及两种叶型时粉碎腔内速度的区别,为认识粉碎腔内的流场结构和叶型的改进提供了直观的模拟结果。     

采用LS型超细粉碎机对几种单质炸药超细化研究

文中介绍了LS型超细粉碎机的工作原理及主要特点,对几种单质炸药HMX、RDX进行了超细粉碎研究,并就各种因素对产品粒径的影响进行了分析,给出了这两种单质炸药采用该机进行湿式粉碎时的极限粒径.研究结果表明,在一定的条件下该超细粉碎机可以使HMX粉径粉碎至5 μm以下,RDX粒径粉碎至7 μm以下.具有结构简单,占地面积少,生产安全可靠等优点.     

CM51A型冲击式超细粉碎机的应用研究

对CM51A型冲击式超细粉碎机的工作原理进行了分析,同时也讨论了影响粉碎设备性能的因素。该型粉碎机是利用高速运转的锤头,采用于法粉碎技术,对莫式硬度小于5的物料进行超细粉碎,通过对煤系高岭土、滑石、碳酸钙类矿物等多种矿物的生产实践和应用研究。生产实践表明,该设备配以分级设备后,最终产品粒度为1250目,产量200kg/h以上,除粉碎外,该设备还具有提高被粉碎物料的纯度和解聚打散的功能。     

供应信息

<正>浙江丰利粉碎设备有限公司产品名称:SFM热塑性塑料微粉磨产品简介:SFM热塑性微粉碎磨是我厂消化吸收国外先进技术研制而成的,能在常温下完成热塑性塑料(如聚乙烯、聚氯     

高效节能QWJ气流涡旋微粉机

国家重点高新技术企业浙江丰利粉碎设备有限公司为满足市场对高档超微粉碎设备的需求，研制成功的国家重点新产品、浙江省火炬计划项目。这是一种立轴反射型粉碎机，能同时完成微粉碎和微粒分选两道加工工序，适合加工各行业莫氏硬度4～5级以下的多种物料，不停机可调节细度。产品粒度均匀，细度高达10～5微米。特别适合加工热塑性、纤维性物料，适用于化工、医药、饲料、塑料、橡胶、烟草、食品、农药、非金属矿等行业的超细粉碎，是一种高细度、低噪声、高效率的节能理想型粉碎机，可替代进口设备。     

自循环超细粉碎机的试验研究

介绍了自循环超细粉碎机的结构及工作原理 ,说明了该设备的特点。自循环超细粉碎机是在吸收国内外先进技术基础上 ,利用自己的专利技术自行研制可以满足金属矿山超细粉碎要求的新型设备     

供应信息

<正>昆山密友实业有限公司产品名称:QYF-100实验室用气流粉碎机原理简介:实验室用气流粉碎机的粉碎原理是基于流化床气流粉碎原理,运用高速气流实现干式物料超细粉碎的设备。它由粉碎喷嘴、分级转子、螺旋加料器等组成。物料在高速气流中加速,并在喷嘴交汇处反复冲击、碰撞,达到粉碎效果。被     

从节能观点认识超细粉碎机

从粉碎功耗学说简要阐述超细粉碎的节能原理及市场上各种超细粉碎机的节能情况。从实用的观点出发,介绍如何选择超细粉碎机。     

湍流粉碎机吸入腔流场的数值模拟

应用三维粘性流动计算软件NUMECA对湍流粉碎机的吸入腔进行了定常三维紊流流场的数值模拟,得到了吸入腔内部流场的压力、速度分布,直观显示了吸入腔内部的流动现象,为后续阶段的整机联算奠定了基础。     

Spin Turbulence and the −7/3 Power Law in a Trapped Spin-1 Spinor Bose-Einstein Condensate

We numerically study the spin turbulence in a two-dimensional trapped spin-1 spinor Bose-Einstein condensate, focusing on the energy spectrum. The spin turbulence in the trapped system is generated through the instability of the initial helical structure of the spin density vector. The spectrum of the spin-dependent interaction energy in the ferromagnetic case becomes to exhibit the ?7/3 power law as the spin turbulence develops, which was confirmed in a uniform system by the counterflow instability. Hence the spin turbulence with the ?7/3 energy spectrum is robust independently of how the turbulence is generated.     

Evolution of linear edge dislocation in atmospheric turbulence and free space

In accordance with the extended Huygens–Fresnel principle, the evolution of linear edge dislocation propagating through atmospheric turbulence is studied, and the effects of waist width and the slope of linear edge dislocation are investigated. It is shown that when linear edge dislocation beams propagate through atmospheric turbulence, if the waist width is not equal and the slope is not zero, then the linear edge dislocation vanishes and transforms into an optical vortex with a topological charge of ?1 or +1. The optical vortex and an optical vortex that is created annihilate when the transmission distance is far enough. The linear edge dislocation vanishes when the slope is zero. If the waist width is equal, then the linear edge dislocation will vanish regardless of the slope value. For linear edge dislocation beams in free space, when selecting specific parameters, linear edge dislocation always exists.     

大型超细搅拌磨机的研制和应用

介绍了LXJM大型超细搅拌磨机的基本结构特点和工作原理,从筒体、搅拌器和传动装置等方面优化设计了超细立式搅拌磨机,提出了最佳的磨机工艺流程,并应用在造纸涂布用亚微米重质碳酸钙的湿法超细加工中,将所生产的产品与国外同类产品进行了比较,产品满足造纸工业的要求。     

往复式轧钢机清洗机的研制

 愈来愈多的轧机使用厂家提出了对轧机专用清洗设备的需求，受一大型钢铁公司的委托，设计研制了轧机清洗机设备－－往复式轧机清洗机。介绍了往复式轧钢机清洗机的研制了开发意义和应用场合，轧钢机清洗机的总体布局和结构特点，及其工作原理和工作过程     

Modeling breakage and motion of black pepper seeds in cryogenic mill

The present investigation aims to represent three-dimensional motion and breakage phenomena of black pepper seeds in the cryogenic mill (hammer mill) using discrete element method (DEM). In DEM modeling, bonded particle model was coupled with Hertz-Mindlin contact model. Calibration method was used to select appropriate model (bond) parameters. The calibrated set of bond parameters includes 3.12?×?10¹¹?Pa?m^?1 normal stiffness; 1.56?×?10¹¹?Pa?m^?1 shear stiffness; 3.88?×?10⁸?Pa critical normal stiffness; 1.94?×?10⁸?Pa critical shear stiffness. Besides, the validity of calibrated parameters was tested in the hammer mill. The observed qualitative and quantitative results (breakage and flow pattern) of numerical and experimental approaches were in good agreement. Based on these results, a few prefatory suggestions were provided to improve the design aspects of the mill. Overall, DEM modeling offered a better understanding of particle breakage and flow pattern in the mill.     

Electromagnetic welding: an advance in thermoplastics assembly

The bonding process employs the principle of induction to produce rapid, reliable, positive seals on thermoplastics. Almost all thermoplastic materials are capable of being chemically joined to each other as long as the joining materials are compatible with each other in the melt state. A variety of dissimilar materials can also be welded by this process. Mechanical linkage of dissimilar materials can be accomplished via joint designs. Technical information is given about the process and several applications discussed.