适合煤矿应用的光纤电缆

<正> 光纤电缆是一种利用光导纤维传输信息的替代常规电缆中的有色金属的一种新的传输工具。它能节省大量有色金属、具有安全性能好、抗电磁干扰能力强、传输距离远、质量高、体积小、重量轻、通信容量大和频带宽等优点。光纤中信息的主要传输原理是将光线有效地束缚在一根很细长的、通常用石英系制成的玻璃纤维管内,从信息发送端发出,通过转换装置使电信号转换成光信号,由玻璃纤维管将光信号进行传输,到达信息接受端时再将光信号转换成电信号。光纤电缆中的光纤由于只传输光信号不传输电信号,故对     

溴系阻燃剂TBC、LBC在阻燃电缆料中的应用

溴系阻燃剂ＴＢＣ、ＬＢＣ在阻燃电缆料中的应用浏阳市有机化工厂熊孝勇近年来，电线电缆的阻燃问题愈来愈引起了有关部门的重视。电线电缆的阻燃采用阻燃化的高分子绝缘材料，这是目前使用最多、最为方便有效的方法。电线电缆护套的主要材料为多种塑料和橡胶。我厂在阻燃...     

矿井低压电缆第四芯的合理截面

煤矿井下禁止采用三相四线制系统供电，而目前矿井低压四芯电缆的第四芯截面的大小，仍参照三相四线制的使用条件执行，这就导致电缆消耗有有色金属最大且使用不便，分析计算了矿井低压四芯电缆第四芯可能通过的电流，并考虑到热稳定性、机械强度等因素，提出了应该生产第四芯截面为１０ｍｍ＾２或６ｍｍ＾２以下的矿井专用四芯电缆。第四芯截面的减小，为制造四芯以上电缆创造了条件，便于井下供电的远控、监视和继电保护。     

露天矿用移动软电缆使用维护及接头处理措施

露天矿山主体设备电铲、牙轮钻机随着采掘位置变化而变化,其供电电缆使用矿用移动式软电缆。该电缆在使用过程中会随着设备移动而拖拽移动。为了减少电缆移动过程中,由于其自身长度、质量以及与地面、石块摩擦等原因,电缆内芯及外皮受到不同程度损伤的现象,从技术、管理两个方面对电缆使用进行维护和规范。规范电缆维护使用后,电缆接头采用硫化处理等措施可以大大减少电缆损伤程度,提高电缆使用寿命和供电可靠性。     

矿用橡套软电缆损坏种类及修复方案

分析了矿用橡套软电缆损坏种类及其性质,介绍了电缆故障测试及查找方法,阐述了矿用橡套软电缆接续及护套修复方案,提出了矿用橡套电缆安全使用的技术措施。     

基于时域反射原理的矿井电缆故障定位方法研究

提出了一种精度高、使用范围广、易于微机实现的电缆故障定位方法，并给出了电缆在短路和断线故障时理论数学模型，探讨了如何利用该模型来实现电缆的故障定位。     

橡套电缆的维修作业线

<正> 采掘设备移动电缆,除正常运行中经常弯曲、拖拽磨损外,还会受到煤块、岩石和金属支柱(架)及其他机械的挤压损伤,使电缆橡套破裂、芯线断线,如全部更换或切除,则将造成不必要的损失,热补是解决这一问题的重要途径。我局经过近10年的摸索试验,形成了“真空干燥;橡套热补;浸水耐压”的橡套电缆     

电缆滑移装置在米村矿的应用

叙述了机采面上副巷电缆过多,拉移时存在费工、费时的问题,自行加工一套电缆滑移装置,通过实践证明,该装置既缩短了电缆的拉移时间,又降低了职工的劳动强度、提高安全性,具有一定的借鉴价值。     

电缆故障的测定方法探讨

电缆在生产生活的应用已经越来越多,无论是高压电缆或低压电缆,在施工安装、运行过程中经常因短路、过负荷运行、绝缘老化或外力作用等原因造成故障。电缆故障可概括为接地、短路、断线三类。     

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