矿用可控硅充电机的技术改造

矿用可控硅充电机的技术改造乐平矿务局呜山矿甘卫华我矿电机车蓄电池充电用的可控硅充电机型号各异、针对这种情况，我们对充电机进行了以下技术改造：（１）把主回路的三相桥式半控整流改为单相桥式半控整流，简化了电路；（２）拆除原有的触发电路．改用阻容移相触发电...     

1998年煤炭行业新发布标准

ＭＴ２６－１９９８ＫＳ型矿灯（代替ＭＴ２６－９１）ＭＴ２４２－１９９８ＫＪ型矿灯（代替ＭＴ２４２－９１）ＭＴ１１１－１９９８矿用隔爆型低压交流真空电磁起动器ＭＴ／Ｔ７６７－１９９８矿用隔爆型直流电动机ＭＴ／Ｔ７６８－１９９８煤用双层伞形叶轮浮选机ＭＴ...     

矿用重型卡车充电机测试平台设计与制作

目前国内外矿用重型卡车24 V供电系统均采用蓄电池组供电,而矿用重型卡车蓄电池组的充电完全依靠独立的24 V充电机进行。24 V充电机是矿用重型卡车充电系统的核心装备,而目前哈尔乌素露天煤矿尚未有矿用重型卡车充电机专业检测装置,只能通过装车进行测试是否完好,严重地降低了充电机维修效率,充电机测试平台的制作有效的提升了矿用重型卡车充电机检修效率。     

KSDK-15N型矿用隔爆多功能可逆手提式开关的研制

主要介绍了ＫＳＤＫ－１５Ｎ型矿用隔爆多功能可逆手提式开关的结构特点、工作与保护原理以及相关的技术参数，指出了可逆手提式开关具有电路简单、保护功能齐全、体积小、重量轻等优点，在控制１５ｋＷ以下的矿用隔爆型电气设备时，完全可以取代ＱＣ８３－８０Ｎ矿用隔爆型可逆式磁力起动器．     

支架搬运车防爆大功率充电机的研制

针对矿用铅酸蓄电池支架搬运车用充电机存在的功率小、温升高、变压器易损坏、整机重心高、搬运易倾倒和损坏等问题,研制了一款适合煤矿井下蓄电池支架搬运车使用的大功率智能充电机。该充电机紧密结合矿用蓄电池支架搬运车的使用工况,在充分掌握吸取神东公司在用进口矿用充电机设计理念的基础上,从防爆壳体、电气主回路、控制回路以及软件等方面进行了科学设计,并进行了样机制造及试验,试验结果表明,该款充电机能够满足标称电压DC 240 V以下,容量2000 AH以下大容量蓄电池的充电要求。     

KGCA系列充电机增设反接保护

<正> KGCA系列矿用隔爆型可控硅充电装置广泛应用于煤矿的开拓掘进工作中。但是该设备在使用过程中曾多次出现烧毁主可控硅元件、硅整流二极管的现象,使生产受到严重影响。针对上述问题,我们对事故原因进行了认真的调查分析,认为产生上述现象的原因是由严重过电流引起的。而这种严重过电流大多是由于充电操作人员工作不熟练或疏忽大意,将蓄电池与充电装置的正、负极性接错,造成二者之间顺极性串联,在起     

矿用隔爆型可控硅充电机的故障与检修

KGCA10—90／40—72KB型矿用可控硅充电机以其优良的性能在煤矿获得了大量的应用。在实际运行中,因使用条件、操作原因及个别元器件的变质失效,仍难免出现故障。现根据维修实践中提出的问题,结合电路工作原理,简要地分析在使用中常见的故障及其产生的原因和部位。     

基于LPC2294的矿用快速充电机设计

传统的充电机多半由工频变压器和整流(或晶闸管调压)电路组成,体积较笨重,运输、使用不便,可靠性差。本文介绍的一种基于LPC2294的矿用快速充电机,不仅可以提高充电效率、缩短充电时间,而且延长电池的使用寿命。     

可控硅三相变流器智能监测的研究

在分析充电机的组成及工作原理的基础上 ,针对充电机常出现的故障 ,以PHIL IP87LPC76 7单片机为控制单元 ,设计了可控硅三相变流器智能监测装置。实验证明 ,该装置监测效果良好。     

KBH60系列矿用隔爆型综合控制箱

介绍了一种新颖的小功率电器控制箱－－ＫＢＨ６０系列矿用隔爆型控制箱的结构特点，单台控制箱的多回路综合控制特性及多台控制箱的成组技术特征，并简要介绍了在煤矿生产中的实际应用。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。