煤炭工业部煤矿专用设备标委会掘进机械分会简介

煤炭工业部煤矿专用设备标委会掘进机械分会简介煤炭工业部煤矿专用设备标委会掘进机械分会成立于１９９１年６月，它挂靠煤炭科学研究总院太原分院，在煤炭部及煤矿专用设备标委会（以下简称煤专设备标委会）的领导与支持下工作。１９９６年１１月，掘进机械分会进行了换...     

煤矿井下大流量泥浆泵车液压系统设计与研究

针对煤矿井下大流量泥浆泵车的使用要求以及开式液压系统和闭式液压系统的特点，提出了大流量泥浆泵车液压系统的总体方案。详细叙述了液压系统中泥浆泵马达回转系统和履带行走系统的组成元件、工作原理及主要液压部件功能。根据泥浆泵车的性能要求对液压系统中重要元件进行了参数计算和选型。考虑到煤矿井下工作环境及闭式液压系统的应用，在液压系统中采取了三种相应的冷却措施来提高系统的散热效果，并对冷却器进行了计算选型以满足大流量泥浆泵车液压系统的散热需求，能较好地适应于煤矿井下应用。     

煤炭工业部煤矿专用设备标准化技术委员会煤矿通信监控分会简介

煤炭工业部煤矿专用设备标准化技术委员会煤矿通信监控分会简介为适应煤矿通信、监控设备标准化工作的需要，在煤炭工业部统一规划下，煤炭工业部煤矿通信监控设备标准化分技术委员会（以下简称煤矿信控分会）于１９９１年５月成立。它是由煤炭工业部标准化行政主管部门（...     

温州凡尔矿业制造有限公司

温州凡尔矿业制造有限公司创建于1983年，座落于温州天然良港——七里港，是一家专业生产煤矿液压支架立柱．电液支架用阀、液压支架用阀、薄煤层大倾角特殊支架用阀等各种液压阀类和液压系统辅助元件产品的中外合资企业。原煤炭相关部门定点生产综机配件的企业，现为中国煤炭机械工业协会常务理事单位。     

煤炭部煤矿专用设备标委会1993年秘书长工作会议简报

煤炭部煤矿专用设备标委会１９９３年秘书长工作会议简报煤矿专用设备标委会水采机械分会简讯第七期煤炭部煤矿专用设备标委会１９９３年秘书长工作会议，于１９９３年１１月３０日至１２月３日在北京召开。参加这次会议的有煤炭部科教司．部技术监督处、煤科总院和总院技...     

液压设备清洁度技术

在煤矿综采机械中，液压系统是重要的动力装置之一，但由于井下作业，液压元件的工作环境周围存在大量的煤粉尘等杂质，液压支架乳化液里有时也混入气体和水分等，这些杂质会改变油液的粘度、酸值，使油液的承载能力下降，引起液压系统故障，严重影响到综采机械的生产能力，因此要对这些污染物进行系统研究，根据液压系统使用要求，确定目标清洁度，实施液压元件清洁度技术、控制液压元件的运行质量。     

煤矿机械中液压冲击的机理分析与控制方法

目前煤矿机械中普遍采用液压传动技术,而液压冲击是煤矿机械液压系统和元件的常见故障之一,它不仅影响液压元件的使用寿命,而且严重妨碍系统的正常工作。分析了液压冲击的产生机理,根据能量守恒定律建立了冲击压力的数学计算模型,并针对产生液压冲击的回路和元件提出了控制策略。     

DYF型大流量安全阀

<正> 由煤科院太原分院和中国矿业大学共同研制的煤矿液压支架用DYF型大流量安全阔于1988年5月通过了部级鉴定。该阀的研制对延长液压支架的使用寿命、减轻支架重量、确保采煤工作面安全生产及提高综采工作面经济效益都有着极为重要的意义。DYF型大流量安全阀是煤矿液压支架承受动载荷时的过载保护元件,其主要技术     

煤矿专用设备标委会电气分会第二次年会召开

煤矿专用设备标委会电气分会第二次年会召开煤炭部煤矿专用设备标准备化技术委员会电气设备分会第二次年会于１９９３年１１月１０日至１４日在浙江省建德市召开。参加会议的代表有：总会秘书处、分会委员、通讯成员及特邀嘉宾共４４人。电气分会副主任委员王瑞义向大会作...     

煤矿实用液压压力机的设计与性能分析

阐述了煤矿机械设备维修用液压压力机(用废旧液压元件和材料制造)设计的主要内容，简要说明了其结构特点，并分析了液压系统的性能。     

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。