基于Profibus总线的煤矿井下无轨胶轮车电气系统设计

无轨胶轮车又可以称为无轨运输车,是煤矿生产中最重要的设备之一。设计了一套煤矿井下无轨胶轮车电气系统,该系统包括数据采集系统和自动控制系统。2个系统之间通过Profibus现场总线进行通信,使得控制器可以获得数据采集系统测量的传感器数据,不断监测和控制无轨胶轮车的运行状态,并给出相应控制。该系统极大地提高了车辆运行的安全可靠性,对日后无轨胶轮的使用具有很重要的意义。     

基于Profibus总线的煤矿井下无轨胶轮车电气系统设计

无轨胶轮车又可以称为无轨运输车,是煤矿生产中最重要的设备之一。设计了一套煤矿井下无轨胶轮车电气系统,该系统包括数据采集系统和自动控制系统。2个系统之间通过Profibus现场总线进行通信,使得控制器可以获得数据采集系统测量的传感器数据,不断监测和控制无轨胶轮车的运行状态,并给出相应控制。该系统极大地提高了车辆运行的安全可靠性,对日后无轨胶轮的使用具有很重要的意义。     

无轨胶轮车自动感应防跑系统的设计与应用

为了保证平硐无轨胶轮车的运输安全,防止无轨胶轮车因刹车失灵发生碰撞事故,通过技术研究,设计了一套无轨胶轮车自动感应防跑系统,即由可编程控制器(PLC)和远程操控系统等组成。通过在三盘区副平硐中安装应用,结果表明该系统自动化水平高,阻车效果好,有效降低了胶轮车运输事故率,取得了良好效果。     

无轨胶轮车湿式多盘失效安全型工作制动装置

对无轨胶轮车工作制动装置的构造原理进行了研究,在保证工作制动装置制动力不变的条件下,设计了一种无轨胶轮车湿式多盘失效安全型工作制动装置,该装置为失效安全型工作制动装置,通过液压回路对碟簧弹性力进行线性控制,改变制动装置动、静摩擦片贴合松紧度对无轨胶轮车实施制动和解除制动,既具备工作制动功能,又可以发挥失效安全型特性自动制动失控运行的车辆,从而提升无轨胶轮车行车安全,有效避免发生重大运输安全事故。     

矿用无轨胶轮车自动感应防撞系统设计与应用

基于平硐开拓煤矿斜井无轨胶轮车辅助运输过程中,因防跑车装置自动化水平低、保护动作灵敏度低等导致频繁出现跑车、撞车事故,并根据实际情况设计了一套车辆限速、自动阻车的无轨胶轮车防撞系统,通过在南阳坡煤矿进行实际应用效果可知,该套装置投入使用后可使无轨胶轮车撞车事故率降低,经济损失减少40余万元,保证了煤矿辅助运输安全,取得了显著应用成效。     

矿用防爆锂电池无轨胶轮车安全性能技术分析

针对目前矿用防爆锂电池无轨胶轮车暂无针对性的国家、行业标准,装备设计、检测与认证依据缺乏的现状,在充分考虑现有相关标准规定、煤矿井下车辆运行的恶劣环境以及复杂工况的基础上,以锂电池、底盘、车身等防爆锂电池无轨胶轮车关键结构与部件为主要对象,研究提出锂电池优选与安全使用、底盘与车身结构合理设计、自动保护监控系统优化配置等方面的安全要求,该要求在6家企业的20多台锂电池无轨胶轮车设计、检测中进行了应用验证,结果表明,锂电池无轨胶轮车相比防爆柴油机无轨胶轮车,运行成本降低3/4以上,出勤率提高近30%。     

煤矿无轨胶轮车防跑车系统开发与应用

为保证无轨胶轮车发生"跑车"事故时乘坐人员的安全,研究新型自动化柔性阻车系统,阻车系统主要由阻车器、车速监测系统、车载遥控、控制系统组成。系统运行过程中,可通过测速雷达、车载遥控自动监测车辆的行驶情况。从试运行实践可知,跑车事故发生时,阻车器动作到位时间约为3.5 s,阻停距离约为12 m,效果良好。     

矿用无轨胶轮车防跑车系统设计

为保证无轨胶轮车发生"跑车"事故时乘坐人员的安全,研究新型自动化柔性阻车系统。阻车系统主要由阻车器、车速监测系统、车载遥控、控制系统等几个部件构成。系统运行过程中,可通过测速雷达、车载遥控自动监测车辆的行驶情况,从试运行结果可知:跑车事故发生时,阻车器动作到到位时间约为3.5s,阻停距离约为12m,效果良好。     

新型矿用纳米吸能阻车器仿真研究

结合矿井斜巷运输实际情况,提出了一种新型纳米吸能矿用阻车器的设计方案。运用LS-DYNA软件建立了包括无轨胶轮车车身、车轮及阻车装置等部件的车辆失速碰撞仿真模型,进一步研究了阻车器材料摩擦因数、纳米吸能结构布置方式、车辆行驶速度等因素对阻车效果的影响。仿真结果表明,布置了纳米吸能结构的新型阻车器阻车效果良好,能大幅度降低制动距离;随着阻车器材料摩擦因数的增大,制动距离减小,但存在车辆翻滚的危险;随着车辆行驶速度的增大,制动距离增大。研究结果对阻车器的设计应用具有指导意义。     

无轨胶轮车驱动技术现状及混合动力方案研究

简述了目前防爆柴油机无轨胶轮车和防爆蓄电池无轨胶轮车的驱动技术现状,基于它们存在的优缺点提出了一种煤矿井下防爆油电混合动力无轨胶轮车。并就该无轨胶轮车的驱动系统和驱动方式及其结构组成进行了阐述,提出了防爆油电混合动力无轨胶轮车将会成为煤矿井下无轨胶轮车的发展方向。     

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