重型刮板输送机链条张力自动调节系统研究

分析重型刮板输送机链条的运行张力分布情况和计算方法,分析链条悬垂量和张力关系,在此基础上构造了通过监测链条的悬垂量对链条张力进行实时自动调节的控制系统。     

干法选煤主机松边链垂度及排煤端底板形状确定

通过对松边刮板链可能出现的悬垂状态分析，确定出允许松边刮板链悬垂的极限位置，得出了计算该位置松边刮板链悬垂度的公式，并依此确定出了合理的排煤端底板的形状，从而避免了松边链条在排煤端底板上堆积而可能出现卡链现象的发生。     

刮板机机尾链条张力自动调节与安全锁紧技术的研究及应用

在实际运行过程中刮板机的刮板及刮板链承受的力为脉动力,存在着严重的压力波动问题,如何保证刮板机机尾链条张力的精准调节和安全锁紧是刮板输送机安全平稳运行的关键问题。论文对刮板输送机刮板链张力的自动调节和安全锁紧技术进行了研究,开发了一套刮板输送机机尾链条张力自动调节系统,并进行了现场应用。结果表明:该系统既可以根据刮板输送机的负载对链条的张力进行自适应调节,又可以精确的实现张紧到位后的自动锁紧,极大地提高了刮板输送机的运行可靠性。     

矿井刮板输送机链条张力监测装置设计研究

刮板输送机是矿井煤炭开采的重要机械设备,由于刮板输送机是通过链条传递载荷作用力实现的牵引,因此有必要对链条的张力进行监测,防止由于链条的失效破坏而产生的跳链、断链的故障。采用虚拟样机技术对刮板输送机链条张力进行分析,设计出针对于链条张力监测的系统,实现刮板输送及链条张力数据的实时采集、远程数据传输等功能,提高刮板输送机生产过程中的安全性。     

刮板输送机链条预紧力、紧链力计算方法探讨

为使刮板输送机链条和链轮始终处于一个良好的啮合状态.论文探讨了刮板输送机链条预紧力的意义以及在各种不同的驱动状况下链条预张力的计算方法,并在此基础上研究了在机头、机尾处紧链时所要的锚固力及紧链力的计算,从而为刮板输送机的预紧提供了理论依据,保证了刮板输送机得以正常的工作.     

模糊PID控制器在刮板机链条的张力控制

本文建立了刮板机张力控制模型,并结合模糊控制和PID控制技术设计了模糊PID控制器,分析了模糊PID控制器对链条张力的控制原理,研究了参数非线性、时变性对刮板输送机链条张力控制系统的影响,制定了模糊控制规则以及模糊推理的方法。利用MATLAB软件对建立的模型进行的仿真,表明模糊PID控制有较好的执行性能,较好地满足刮板机链条的张力控制要求。     

刮板输送机张力波动监测及疲劳诊断

为了监测和诊断刮板输送机链传动系统故障,提出了一种基于张力波动特征的疲劳诊断方法。首先分析了刮板输送机载荷变化引起的张力波动变化特性,在此基础上利用ADAMS构建了链传动系统张力波动动力学模型,并以此模型的仿真结果为载荷输入,利用ANSYS有限元分析软件,对链传动系统关键零部件的应力和变形分布情况进行监测,从而完成疲劳诊断。实验仿真结果表明,该方法能有效地对链传动系统张力进行实时监测,以及对链轮、链条等刮板组件的疲劳状态进行诊断。     

刮板输送机链条张力分析与计算研究

探讨了刮板输送机运行中链条张力分布及预张力的计算,并设计了一种简单的检测机头最大张力方法,为刮板输送机的自动张紧控制系统打下基础,保证了刮板输送机正常工作。     

刮板输送机链条张力自动监控系统研究

论文根据刮板输送机实际工况要求,简要介绍了系统实现的原理,分析了刮板输送机链条张力运行过程中的分布状况以及其计算方法,同时阐述了链条张力检测系统和控制系统的构成,设计出了采用PLC控制的刮板输送机链条张力自动监控系统,并运用Matlab对系统进行了动态仿真。     

综采工作面刮板输送机链条自动张紧试验研究

为避免生产过程中刮板输送机机尾堆链引发的断链事故,以12521工作面SGZ1000/3×1200刮板运输机为试验背景,采用ZGJ127矿用刮板机链条自动张紧电控装置,研究刮板输送机自动张紧装置的工况,监测刮板机链条自动张紧电控装置运行情况,试验得出该装置链条在油缸压力设定为1~1.1MPa时达到预期目标,可保证刮板机的正常安全运行。     

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

正~~     

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