掘进机使用过程中需要注意的问题

为加强掘进机维护保养、减少掘进机事故的发生,充分发挥掘进机的效率,剖析了压力、温度、油质对掘进机的影响以及操作方式和保护投用等方面的重要内容。     

全断面岩石掘进机刀盘体结构的演化与发展

全断面岩石掘进机刀盘体结构复杂、作业环境恶劣,一直是领域研究的热点和难题,且目前在施工的全断面岩石掘进机刀盘体不时出现开焊、联接螺栓断裂等事故.基于此,我们系统研究了全断面岩石掘进机刀盘体结构的演化和发展,发现全断面岩石掘进机刀盘体经历了单板、双板和三板结构的演化,每一次演化对刀盘体的功能都是一次扩容,如增加强度、刚度...     

EBJ-120TP型掘进机的应用

EBJ-120TP型掘进机的使用,提高了巷道掘进速度,减少了掘进机机电事故,提高了技术装备水平,为进一步提高单进、确保回采正常衔接和安全生产奠定了基础.     

浅析煤矿机电事故的原因及防治措施

矿井机电事故主要是指采掘机械如采煤机、液压支架、刮板输送机、带式输送机、掘进机、耙斗装载机等在工作过程中发生的人身伤害事故,以及发生在低、高压电网、直流架线间的人身触电事故。介绍了一般矿井发生机电事故的原因,指出了防止机电事故的预防措施。     

使用AM-50型掘进机需要解决的几个电气安全技术问题

目前，掘进机已在全国各大中煤矿普遍使用。掘进机是巷道掘进技术发展的方向，它与普通钻爆法掘进比较有显著优点。但由于使用过程中的种种失误，曾发生过绞人、倒柱、冒顶等事故。其安全技术问题应引起人们的注视。     

减少局部断面掘进机工作时发生瓦斯引燃的危险

<正> 近几年发生了一些因使用刨削式和切割式采煤机、工作面运输机和巷道掘进机而引起的瓦斯燃烧事件。幸而没有造成人员和物质损失。已经确认,这些事故的增加是由于近来使用了局部断面掘进机的缘故。 其原因可列举如下: 煤巷掘进从钻眼爆破工作转向使用局部断面掘进机。随着局部断面掘进机使用数量的增加,由使用这种机器而引起可能燃烧的机会也就增加。     

掘进机截割头主轴断裂分析

针对矿用掘进机截割煤岩过程中截割头主轴断裂事故,通过对断裂轴进行断口分析、成分分析、组织观察、能谱分析、电镜观察等检测分析,找到截割头主轴断裂原因。     

掘进机周围人体红外报警系统的应用

通过分析掘进工作面的掘进机旋转部位主动保护的问题,提出了一种人体红外报警系统,实现了掘进机截割部位的本质安全。通过在陈四楼煤矿2517轨道顺槽的应用效果分析,保护装置大大提高了设备的安全性,杜绝了截割部位伤人事故的发生,具有较好的社会效益。     

煤矿掘进机扒爪减速器的设计改进

针对悬臂式掘进机作业时经常发生被大块煤、矸或者铁器卡住的情况,利用了采煤机扭矩轴便于更换的优点,使用扭矩轴代替扒爪中的螺钉连接,通过对扒爪的扭矩计算以及扭矩轴的结构优化设计,极大地缩短了机电事故影响的时间,从而提高了掘进机运行的可靠性。     

大功率掘进机危险区域报警系统设计与实现

针对大功率掘进机工作时其周边作业人员无意识进入掘进机危险区域以此带来安全隐患,甚至引发人身安全事故的问题,开展掘进机危险区域报警系统的研究。该系统以电磁场理论为基础,利用低频电磁波作为测距媒介,采用检测电磁波强度及三边定位算法确定井下作业人员的位置,并判断是否在危险区域。系统选择STM32F103嵌入式ARM作为控制芯片,由安置在掘进机上的集中式数据处理装置和工作人员随身携带的移动监测装置2部分组成。通过对样机的模拟试验测试,在0.5~4.0 m内人员定位判定平均误差为4.3%,实现了危险区域的定位与报警。     

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