带式输送机软启动方式比较分析

阐述目前国内露天煤矿生产系统普遍应用的大功率、多电机、长距离带式输送机的几种软启动方式,对软启动方式进行性能价格比较,并得出结论。介绍了带式输送机的刚性启动和软启动方式的性能;对带式输送机的CST可控启动装置和液力耦合器两种机械软启动方式和电气软启动器、变频器两种电气软启动方式的优缺点进行了对比,并对各种软启动方式的具体应用提出建议。     

带式输送机智能调速控制系统设计

针对带式输送机系统耗电量大、机械磨损严重、输送带带速与运量无法合理匹配的工程背景,研究了变频调速控制原理和带式输送机智能调速控制系统设计方法。阐述了影响带式输送机系统能耗的因素,利用传感器实时监测输送带煤流量和带速数据,采用模糊控制算法构建了输送带速度、负载模糊控制器模型,设计了带式输送机智能调速控制系统。测试表明:使用该系统后,带式输送机能够根据负载自适应地调节带速,实现了节能降耗、延长了输送带使用寿命,对提高企业生产效率具有很高的应用价值。     

通用(GE)PLC在煤矿运输过程中的应用

设计了基于GE Fanuc PLC的煤矿大功率带式输送机的电气控制系统,介绍了其系统结构以及实现功能,并且从系统的软硬件设计、大功率带式输送机的多电机启动以及功率平衡等方面提出了解决方案。     

基于PLC控制的带式输送机智能调速系统设计

针对选煤厂带式输送机实时运行情况,开发了一种由变频器,执行电动机,控制装置以及负载电流检测等组成的智能调速系统。该系统不仅能实现带式输送机的软起动、软停车,而且能对带式输送机实时变频调速控制,在很大程度上降低了电能消耗,减少了设备的机械磨损,提高了带式输送机的运行安全系数和系统的自动化水平。     

SRM在煤矿机械中的应用

介绍了开关磁阻电机的工作原理以及应用于煤矿机械的主要优点,结合开关磁阻电机在采煤机、绞车、带式输送机等煤矿机械中的应用实例,进一步阐明了开关磁阻电动机调速系统在我国煤矿机械的新产品开发以及老产品的技术改造中具有广阔的应用前景。     

带式输送机多机驱动功率平衡双模糊控制器研究

针对带式输送机三机驱动功率不平衡的问题,设计了一种双模糊控制器,以克服单模糊控制器存在的规则数目过多的问题,并引入了智能积分环节以提高稳态精度,介绍了其硬件及软件实现,将其加载到3台50 kW电机驱动带式输送机系统,试验结果显示其响应速度快、静差小,达到了预期的控制效果。     

基于RBF-PID控制器的带式输送机自适应调速系统

带式输送机是煤矿开采过程中重要的运输设备,运输距离长,耗能大。提出基于RBFPID控制器的带式输送机自适应调速系统,实现带式输送机自适应调速从而降低其能耗。通过对带式输送机的能耗与煤量、带速之间的关系进行分析,建立带式输送机的能耗模型。为实现功率平衡,采用RBF-PID控制器调节电动机输出电压。阐述了RBF-PID控制器的工作过程,完成了基于RBF-PID控制器的带式输送机自适应调速系统的硬件设计和软件设计。该系统能耗低,节能效果良好。     

永磁变频直驱系统对带式输送机驱动选型设计的影响

目前,永磁变频直驱系统在带式输送机上的应用越来越广泛。介绍了永磁变频直驱系统的组成及特点,详细分析了永磁变频直驱系统对带式输送机电动机选型计算的影响及其对带式输送机电动机选型观念的影响,并给出永磁变频电动机选型时需要满足的2个条件。该研究可为带式输送机永磁同步变频电动机的选型提供思路。     

液体粘性软启动装置现场应用于输送机的可行性研究

随着采矿业的发展，输送机械（特别是前推式开采的煤矿中的带式输送机械）的装机功率也越来越大，为此对驱动装置提出了苛刻的要求，希望驱动装置能够实现：①电动机空载起动，以减小对电气和机械的冲击；②驱动装置能提供可调的、平滑的、无冲击的起动力矩；③与电动机具有良好的匹配特性，充分利用电动机的最大力矩；④需要时可以实现多电动机驱动功率相互平衡；⑤可以实现输送机的无级调整，以满足不同的工作需要；⑥输送机过载时能实现自动过载保护功能。同时“煤矿安全规程”规定，煤矿主要运输系统的带式输送机必须采用软启动系统，以保证带式输送机的可靠、稳定运行。     

基于DSP的带式输送机多电机驱动功率平衡控制系统研究

带式输送机因输送距离过长常常采用多电机驱动,多电机之间的功率平衡问题是必须解决的。采用参数自适应模糊PID控制器来调节带式输送机的功率平衡,通过分析带式输送机的结构确定了以液力耦合器勺杆的推拉来实现电机电流大小的调节,明确了控制系统调节电流大小的流程和策略,并完成了控制系统的软件设计,精简了主程序,实现了在主程序中对各个子程序的调用。仿真结果显示参数自适应模糊PID控制器比传统的模糊控制器性能更好。     

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