大流量给煤机滚筒的相关问题及解决办法

伴随着煤矿产量的提高,大流量给煤机在煤矿运输系统中起到了至关重要的作用,确保大流量给煤机的安全运行必须解决好皮带的跑偏、滚筒的"窜轴"等问题。针对大流量给煤机安装试运行中现场出现的问题,叙述了查找分析的过程,提出了解决的办法及措施。     

带式输送机驱动滚筒的改进

目前,矿山带式输送机驱动滚筒多为铁质,有诸 多缺点,我们对其进行了改进。 １铁质驱动滚筒的缺点 我单位共有３条大负荷的带式输送机,都是经电机──变速箱──皮带运输机传动的。生产中,我们发现铁质驱动滚筒存在以下缺点：（ １）寿命短,简体一般使用９－１２个月就被磨透,尤其当皮带反面掉有大块矿石时,磨损加剧;（２）当运输带负荷较大时易打滑,若持续时间过长,极易烧毁电机。 上述故障是由以下原因造成的（１）运行时运输带与滚筒间必然掉有矿石,在持续辗压下,接触面变得粗糙,细沙颗粒磨损滚筒严重;（２）因为橡胶与铁…     

ACS800变频器在煤流运输系统中的应用

介绍了张家峁煤矿煤流运输系统应用ACS800变频器后,大大降低了能耗,提高了有功功率,降低了给煤机强度等级及皮带跑偏打滑现象,在皮带满速运煤的情况下,皮带载煤率提高.     

皮带机机尾立体保护装置研制与应用

该装置由三角清扫器,竖向清扫器和横向清扫器组成,分别保护机尾滚筒的上侧、下侧和前侧,既能在正常情况下起到防止细小煤矸被皮带带入机尾滚筒与皮带接触面,损害机尾滚筒与皮带表面,又能防止当给煤机跑煤、水后机尾滚筒不被淤煤淤满,滚筒做适当清理后即可转动运行,形成立体保护。     

驱动滚筒结构与工艺研究

正驱动滚筒作为带式输送机的主要传动部件,其承受较大的交变应力,合理的结构设计和规范的制造工艺是保证设备正常运行的必要条件。驱动滚筒主要有铸造和焊接2种结构,小型驱动滚筒采用焊接结构,其主要失效形式之一是轴与支撑板焊接处的焊缝开裂。针对焊缝开裂的问题,利用有限元软件对其进行数值模拟分析,根据仿真结果对驱动滚筒进行结构优化和制造工艺的改进,有效地解决了故障,保证了生产的稳定运行。1驱动滚筒的结构和受力分析驱动滚筒由转轴、滚筒、支撑板和端轴焊接而     

皮带输送机滑水现象研究

皮带输送机在下雨或其他原因造成滚筒面与胶带表面有水存在时,容易发生打滑现象.本文对皮带输送机在滚筒与胶带摩擦面有水的情况下发生滑水现象进行了分析研究,提出了通过增加布置清扫器和加深驱动滚筒表面沟纹的办法解决了这一问题.     

矿用带式输送机传动滚筒静力学分析及其结构优化研究

带式输送机是煤矿生产中重要的辅助运输设备,而传动滚筒是带式输送机中主要的受力结构件。以DTL120型带式输送机传动滚筒为研究对象,利用SolidWorks和Ansys软件建立传动滚筒的静力学模型,分析后发现传动滚筒中的主要零部件存在应力集中问题,威胁着零件的运行稳定性。对零部件的结构尺寸进行优化改进,主要是增加尺寸以提升整体的刚度和强度。通过优化改进,传动滚筒中零部件的应力集中现象和位移变形情况得到了显著降低,有效保障了传动滚筒运行过程的可靠性。将优化方案应用到DTL120型带式输送机工程实践后,机械整体运行稳定,取得了很好的经济效益。     

皮带输送机缓冲托辊的改进分析

煤矿皮带运输机承担矿井的主要运输工作,但由于某些工作面距离较长,煤炭运输需要多台皮带运输机,这就形成了皮带运输机的搭接问题,因此,皮带运输机在运行过程搭接处就易出现煤炭抛落,产生的冲击力对皮带及托辊造成破坏。本文介绍了带式输送机的搭接及其对托辊的危害并分析了其原因,提出了在托辊下方安装缓冲弹簧的改进设计,并进行了强度校核,确定了合理的载荷,改进后的皮带运输机在实现高效运煤的条件下,没有出现托辊破坏现象,应用效果显著。     

带式输送机断带整体式制动装置的研发与设计

针对目前煤矿带式输送机离散式断带保护装置存在制动力小、可靠性不高、撕裂皮带、使用有局限性等问题,设计了输送机断带整体式制动装置,利用运动的双排交错线圈产生附加磁场,通过磁场探头动态检测磁场变化.由A/D转换器输入单片机,进行断带判断处理与抓捕命令的输出,迅速切断驱动滚筒电源,启动抓捕器,有效地对断裂的皮带进行抓捕,减少了断带带来的损失,缩短了维修时间.     

移动给煤机程控改造

针对某电力公司的移动给煤机在生产中控制系统存在的突出问题进行分析研究,并针对存在的问题进行相应的程控改造,改造后的控制系统不仅增加了运行的可靠性,同时还节约了成本,降低了劳动强度,在使用时达到了预期的效果。     

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