楔形联接装置的分析与探讨

通过2种钢丝绳联接装置的技术对比,分析了2种钢丝绳联接装置的优缺点,为如何选择钢丝绳联接装置和《煤矿安全规程》中关于楔形联接装置的定义提出了建议。     

渐开线花键联接与三边型面联接比较

渐开线花键联接加工简单,受载均匀,三边型面联接拆装方便、联接强度高,2种联接各有优势,从廓形曲线、强度计算、加工制造3方面对渐开线花键联接和三边型面联接进行分析比较,为设计人员选择合适的联接方式提供参考。     

2m3矿车翻车机改造

2m^3矿车翻车机的刚性联接改为柔性联接，使故障率大幅下降。     

液压支架双耳联接头受力分析及改进措施

利用有限元分析法分析液压支架双耳联接头在推拉2种工况下的应力分布情况,结合联接头实际损坏情况,找出联接头受力时的薄弱位置,通过改进联接头薄弱位置的尺寸,将联接头的安全性提高35%以上,满足井下实际使用的要求。     

电机横向布置液压牵引采煤机的联接

介绍 2种电机横向布置液压牵引采煤机的联接 ,并对联接的结构特点、装配关系等进行阐述     

基于ANSYS Workbench的采煤机联接架模态分析及优化

以某型采煤机的联接架为研究对象,运用Solid Works对采煤机联接架进行三维模型绘制并以x_t格式导入到ANSYS Workbench中进行有限元分析,通过模态分析和谐响应分析得出了联接架的固有频率、振型以及频率与振幅的关系,并且通过对比模态分析与谐响应分析结果,发现一阶固有频率2 018.5 Hz对联接架影响较大,容易引起共振现象。通过在原联接架基础上增加壁厚来进行优化,使采煤机联接架固有频率增加了约5%,为今后采煤机联接架的设计和改进提供了数据支持。     

非圆行星齿轮液压马达的联接销装配工艺

在非圆行星齿轮液压马达中,有3根相互平行的圆柱形联接销,两端都被芯部组件和壳体的盲孔所包含。联接销在装配时处于密室中,按照现有的正向装配方法,芯部组件在壳体上方,联接销装配难度大。提出了逆向装配的新方法,将壳体调转到芯部组件的上方,进行联接销的装配。根据马达的公差设计,计算了2种方法中联接销及其对应盲孔的最大实体实效尺寸,结果表明联接销的装配工艺性得到有效的改善。开展了对比性的装配试验,结果表明,采用新方法后,该工序的平均时长缩短了70%以上。     

矿井提升机轴毂过盈联接可靠性分析

为了研究矿井提升机轴毂过盈联接的可靠性,在建立2JK型号单绳缠绕提升机的轮毂与轴接触模型基础上,用有限元法计算轮轴接触区附近的应力,利用响应面法分析过盈量、摩擦系数对接触应力的影响规律。在建立轴毂过盈联接的概率模型基础上,利用六西格玛分析方法评估过盈联接可靠性。     

764系列中部槽哑铃结构与扣环结构的应用效果

针对764系列中部槽的2种联接结构形式,分别对槽帮、中板接口、刮板、联接等结构形式进行对比分析,同时对2种结构中部槽的使用效果进行了验证及对比,从而选择更合理的结构满足不同工况的使用要求。     

副井绞车主整流装置改造的经济与技术分析

介绍了东庞矿副井绞车主整流装置的改造 ,选用通用程度高、制作技术成熟的 34 0 0 0 V、50 0 A的 SCR元件 4只并联接取代原 2 50 0 V、50 0 A2串 6并联接 ,并对其可行性进行了分析。     

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。