闭环控制增压式磨擦传动装置的结构设计和实验研究

为了验证闭环控制增压式找性体磨擦传动机理的客观性,以带一送机为例,阐述了其结构设计思想;制作了基于该理论下的实验机;在不同反馈系数的情况下,进行了极限磨擦传动牵引力的测试,并与理论计算数值进行了比较。结果表明：当反馈系数Kf＜0．51时,Symax随Kf和S1的增大按一定规律递增;当Kf=0.6和0.8时,传动装置不打滑。其结果验证了增压磨擦传动的有效性,表明理论研究所提出的极限牵引力数学模型是正确的。并对实验测试与理论计算的误差也作了分析。     

一种新型摩擦传动装置性能的探讨

众所周知,带式输送机摩擦传动装置能够传递的极限牵引力是根据下式计算的: w_o=S_e(e~(μa)-1)=Sy(1-1/e~(μa))(1)式中S_e——输送带在传动滚筒分离点的张 力,N; S_y——输送带在传动滚筒相遇点的张 力,N; μ——输送带与传动滚筒之间的摩擦 系数; a——输送带在传动滚筒上的围包 角,rad。     

直线摩擦驱动装置在强力皮带机上的研究与应用

直线摩擦驱动是借助于一段传动输送带依靠摩擦力对承载输送带进行驱动的一种传动方式,其驱动力不但平衡承载输送带在驱动装置上的运行阻力,而且通过承载输送带输出牵引力。     

摩擦式矿井提升机摩擦分析与防滑措施浅析

摩擦式矿井提升机安全运行的关键是防滑问题。在分析摩擦式提升机钢丝绳摩擦传动原理的基础上,探讨了影响传动摩擦力大小的有关因素,提出了提高摩擦式提升机防滑能力的技术措施,阐述了其技术措施的可行性。     

摩擦式提升机摩擦传动分析与防滑技术研究

摩擦式提升机安全运行的关键是防滑问题,在分析摩擦式提升机钢丝绳摩擦传动原理的基础上,探讨了影响传动摩擦力大小的有关因素,提出了提高摩擦式提升机防滑能力的技术措施,阐述了其技术措施的可行性。     

带式输送机运行阻力和摩擦系数的现场测定

<正>兖州矿业(集团)公司兴隆庄煤矿就如何进行带式输送机运行阻力和摩擦系数现场测定开展了研究。此项研究假设驱动滚筒的轴功率转化为牵引力全部用来克服运行阻力;输送带为理想的摩擦传动体,不考虑摩擦生热带来的变化。     

行星轮式和摩擦锥组合升降机的设计和应用

一、概述升降机是钻机的主要执行机构之一，在钻孔的全过程中，其主要作用是升降钻具和提锤冲击钻进。升降工序的工作时间所占的比例甚大，并且随孔深而增加，一般约占工作时间的三分之一至二分之一，升降机的完善程度必然明显地影响钻探效率和质量，因此，升降机设计是否先进，对整台钻机的质量影响很大。按照传动方式的差异，机械传动钻机曾经用过的升降机主要有槽型摩擦轮传动式、摩擦锥传动式、行星轮系传动式三种。目前，除少数钻机采用摩擦锥传动式升降机外，几乎所有现代化钻机均采用行星轮系     

带式输送机牵引力分配的研究

目前一些矿井双电机带同步齿轮传动的刚性联系双滚筒带式输送式，在使用中经常出现一个筒严重磨损问题由两滚筒牵引力的分配，分析了出现这种问题原因，并在设计和应用中，在空间布置允许的情况下，心意一采取单电机同步齿轮传动较好；如采用双电机，最好采用带液力偶合器的分别传动而不宜采用同步齿轮传动。     

驱动滚筒包胶表面形貌仿生设计

阐述了带式输送机驱动滚筒的摩擦传动原理,基于挠性体摩擦传动的欧拉公式提出增大摩擦牵引力的3种途径。从生物攀爬附着现象中得到启示,从仿生学角度出发,提出了改善滚筒包胶表面形貌的新思路。以树蛙、螽斯的足垫为原型,分析其微观结构形貌,运用相似工程学原理设计出一种具有六边形凸包的滚筒包胶结构,以求能够增大接触面的摩擦力,并用Pro/E软件建立了该结构的实体模型。     

基于虚拟样机技术的摩擦式 提升机动力学仿真

为研究摩擦式提升机的摩擦传动特性,构建了摩擦式提升机多点接触动力学计算模型,分析了空载和重载工况下提升容器的速度与应力情况,并在提升主轴上选取测点对理论分析结果进行验证。结果表明,摩擦式提升机多点接触动力学计算模型为分析摩擦式提升机提升过程中部件的动应力历程,以及摩擦接触处钢丝绳的接触力、张力、滑动、接触等摩擦传动特征提供了一个有效的研究工具。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586