综放工作面输送机下滑及控制

分析了综放工作面输送机下滑原因,探讨了影响工作面输送机与工作面底板摩擦因数,针对工作面不同倾角提出了控制输送机下滑的方法。     

综采工作面刮板输送机上窜下滑控制实践

刮板输送机上窜下滑管理是综采工作面生产管理的难点和重点,分析了综采工作面刮板输送机上窜下滑的原因和危害,给出了综采工作面刮板输送机上窜下滑的判断方法,最后提出了刮板输送机上窜下滑的控制和调整方法:调整工作面伪斜;工作面液压支架架向调整;改变割煤工艺;做好工程质量控制。     

伪斜面刮板输送机防滑三维立体分析

针对担水沟煤业有限公司4101伪斜工作面刮板输送机普遍存在的下滑问题,通过惯性力解析解的推导、刮板输送机下滑趋势的判断和伪斜工作面三维立体模型的建立,求解出了伪斜工作面刮板输送机不下滑条件不等式。运用数学分析方法对刮板输送机不下滑条件不等式进行了深入的探讨,提出了伪斜工作面刮板输送机防滑的技术措施。     

综采工作面刮板输送机下滑机理分析及其控制

利用力学原理对综采工作面刮板输送机下滑的机理进行了详细的分析,阐明了输送机下滑的主要原因,并提出了防止综采工作面刮板输送机下滑的切实可行的措施,为综采工作面正常生产解决了一大难题.     

综放工作面输送机下滑控制

兖州矿业（集团）公司鲍店煤矿开展“综放工作面输送机下滑及控制”的研究。分析了综放面输送机下滑原因。探讨了影响工作面输送机与工作面底板的摩擦因数。针对工作面不同倾角提出控制输送机下滑的方法。     

浅谈综采工作面的防倒防滑技术

综采工作面技术重点工作之一就是如何防止工作面输送机和支架上窜下滑,分析了输送机下滑的原因,提出了防止输送机下滑的措施,并针对液压支架的防倒防滑进行了阐述,对大倾角、大采高综采工作面的管理有一定的指导意义。     

大高差采煤工作面刮板输送机“上窜下滑”控制技术研究

为了解决采煤工作面刮板输送机"上窜下滑"的问题,从采煤工作面倾角、支架与刮板输送机位置关系、采斜、推移刮板输送机方向、采煤机截割方向、刮板输送机张力、采煤工作面面长变化及底板平直等因素中分析了影响刮板输送机"上窜下滑"的主导因素,详细阐述了刮板输送机"上窜下滑"控制技术。实际应用表明,该控制技术采取相应最优措施,最终能够实现刮板输送机"上窜下滑"的精准控制。     

大倾角综放工作面输送机上窜下滑的控制分析研究

针对大倾角(大于25°)综放工作面输送机上窜、下滑的问题,分析了阳城煤矿1316大倾角工作面输送机上窜下滑原因,通过采用伪倾斜调面、静态机械调整、优化操作等方法有效控制了输送机上窜下滑,为相似条件的综采大倾角工作面提供借鉴和参考。     

基于“双机”耦合下前部刮板输送机“上窜下滑”研究

以11501工作面为工程背景,针对前部刮板输送机上窜下滑规律进行研究,提出了“双机”耦合相对直线度概念,将前部刮板输送机溜槽与液压支架推移杆两者间夹角作为判断工作面两设备直线度的指标;提出了绘制标高变化梯度图,根据此图预测工作面变化长度,提前采取措施控制前部刮板输送机上窜或下滑使其与巷道相随;分析出正、负伪斜工作面下前部刮板输送机上窜下滑时夹角数据特征,根据夹角数据特征对前部刮板输送机进行调控,保障工作面正常生产。研究成果为煤矿企业应对倾斜煤层工作面前部刮板输送机上窜下滑提供新思路、新方法。     

综采工作面刮板输送机上窜下滑的控制

刮板输送机上窜下滑管理是综采工作面生产管理的难点和重点,文章阐述了综采工作面刮板输送机上窜、下滑的基本运动规律及其控制方法。     

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。