AM50型掘进机电控箱隔振器的试验研究

ＡＭ５０型掘进机电控箱隔振器的试验研究中国矿业大学安伟，陆信，魏任之ＡＭ５０型悬臂式掘进机是一种整体尺寸较小，切割断面较大的部分断面掘进机，在我国煤矿使用效果较好，应用较多。由于掘进机工作环境恶劣，振动大，在较为强烈的振动下，可能会使机上电控箱内电器...     

AM50掘进机的振动测试及其信号分析

叙述了ＡＭ５０掘进机的振动及信号分析，对其切割人工煤壁与真实煤壁时各种工况下的振动信号进行了认真的分析与对比，得出了ＡＭ５０掘进机切割时振动幅值的统计结果及振动加速度信号的频谱特征。     

AM50型掘进机切割臂联接失效分析

ＡＭ５０型掘进机切割臂联接失效分析中国矿业大学北京研究生部朱旬华东理工大学秦剑秋自８０年代我国引进奥地利掘进机技术以来，陆续已有数百台国产ＡＭ５０掘进机投入使用，提高了我国综掘水平。ＡＭ５０掘进机属于７０年代机型，设计上有不足之处，加之国产机制造缺陷...     

AM50型掘进机存在的问题及其改进

本文对ＡＭ５０型掘进机在平煤集团公司使用中存在的问题进行了分析，提出了改进。     

PLC可编程控制器在AM50掘进机的应用

应用ＰＬＣ可编程控制器对ＡＭ５０型掘进机电控系统进行改造，提出了煤矿用掘进机电气系统可靠性研究的新经验和新思路。     

掘进机截割部刚柔耦合动力学特性分析

以某型重型纵轴式掘进机为载体,研究掘进机在横截工况下截割部的振动以及受力特性。首先在LS-DYNA中进行掘进机截割头截割岩石仿真,获得掘进机工作条件下截割头所受到的外载荷,然后运用ANSYS软件对截割部包括悬臂段、截割减速箱及截割电机箱体进行柔性化,最后在ADAMS中对整机进行刚柔耦合分析。研究结果为掘进机的截割部减振设计研究及其结构优化改进提供了理论依据。     

基于有限元与实测数据的掘进机回转台振动特性分析

为探索掘进机振动特性的可靠分析方法，针对掘进机回转台因长期承受较大多变应力-应变而发生断裂的情况，研究了掘进机回转台的振动特性分析方法。将井下实测数据与仿真模型相结合，通过有限元软件，采用软件建模与实际载荷输入结合的方法，对掘进机回转台的振动特性进行分析。首先完成其在截割过程中的受力分析；并通过Pro/E与ADAMS建立掘进机回转台有限元模型，并对掘进机在巷道掘进过程中的载荷数据进行采集，将数据进行选取、处理与组合建立仿真载荷并将其导入模型，得到最接近实际工况的有限元模型；然后通过ADAMS进行振动模态分析，求解了掘进机回转台的前6阶固有频率、振型及振动响应的功率谱密度，同时开展了掘进机回转台的模态试验进行对比。结果表明，该分析方法与试验结果在振型与各阶频率上均保持一致，平均偏差仅为11.83%，最小偏差仅为为2.41%，并分析了出现偏差的原因，证明其可以对掘进机回转台结构修改与动力特性改善提供参考依据。     

复合材料齿座选材分析

通过对ＡＭ－５０型掘进机原整体齿座和新型复合材料齿座的化学成分、组织结构、使用性能等综合试验分析，提出了我国研制新型齿座的国内代用材料及制造工艺的关键之处。     

改变AM－50型掘进机刮板链的传动方式

改变ＡＭ－５０型掘进机刮板链的传动方式大同矿务局机电公司刘树强，刘嘉慧忻州窑矿１９８７年购买了４台ＡＭ－５０型掘进机，经使用发现每掘进１００ｍ，输送机刮板约丢失１０块，驱动轮轴和改向轮轴上的链轮断齿，减速机圆弧伞齿轮磨损严重，摩擦离合器摩擦片经常被烧...     

基于有限元与实测数据的掘进机回转台振动特性分析

为探索掘进机振动特性的可靠分析方法,针对掘进机回转台因长期承受较大多变应力-应变而发生断裂的情况,研究了掘进机回转台的振动特性分析方法。将井下实测数据与仿真模型相结合,通过有限元软件,采用软件建模与实际载荷输入结合的方法,对掘进机回转台的振动特性进行分析。首先完成其在截割过程中的受力分析;并通过Pro/E与ADAMS建立掘进机回转台有限元模型,并对掘进机在巷道掘进过程中的载荷数据进行采集,将数据进行选取、处理与组合建立仿真载荷并将其导入模型,得到最接近实际工况的有限元模型;然后通过ADAMS进行振动模态分析,求解了掘进机回转台的前6阶固有频率、振型及振动响应的功率谱密度,同时开展了掘进机回转台的模态试验进行对比。结果表明,该分析方法与试验结果在振型与各阶频率上均保持一致,平均偏差仅为11.83%,最小偏差仅为为2.41%,并分析了出现偏差的原因,证明其可以对掘进机回转台结构修改与动力特性改善提供参考依据。     

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     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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     

2014 second batch of rare earth quota released

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