矿用节能双级振动筛方案设计及实验分析

为从原始结构上改进矿用振动筛的设计，针对矿用节能双级振动筛方案设计环节因信息缺乏而无法量化评价的问题，利用黑箱法进行了方案设计，采用功能解析法建立了方案组合评价的最优化求解模型，并且利用动态规划方法找到了矿用节能双级振动筛的最优结构方案组合，根据方案最优解完成了节能双级振动筛的方案设计、数字样机开发和产品样机的制造。为验证设计可行性，对样机进行了振动测试，测试研究结果表明双级筛较同规格传统筛节能37.8%，方案设计合理、方法可行。     

改革开放以来我国振动筛分设备的发展

振动筛是煤炭洗选高效利用的关键设备,改革开放以前,国产振动筛筛分效率低,可靠性差,随着不断引进国外先进设备和深入研究筛分技术,国产振动筛不断完善。为了说明自改革开放以来我国振动筛的创新发展,以等厚筛、反共振振动筛、弛张筛等先进筛机为例,从筛分理论、振动理论和筛机结构三个方面介绍了主要的新式设备及其工作原理。此外,根据目前的工业形势和国家政策,从优化设计、环保节能、智能化、标准化等几个角度讨论了振动筛的发展方向。     

振动筛的一、二次隔振与反共振技术的应用

振动筛是近些年来全国各洗煤厂对物料进行筛分,以及对选后产品进行脱水与脱介的必要机械设备之一。通常使用一、二次隔振以减少其工作时对地基的动负荷及其所产生的噪音。普通一次隔振振动筛的隔振装置可以减小其带给地基振动的85%~90%,二次隔振振动筛的隔振效果甚至可以达到90%~95%。反共振机械因为有其独特的反共振原理,可以很好地满足系统对振动频率、幅值的要求,并减少对地基的损害以及工作噪声。反共振振动机械在工作时传给基础的动负荷,可以比普通一次隔振振动筛减小大约57%,甚至比一般的二次隔振振动筛还要小。     

矿用节能双级振动筛组合弹簧设计及实验分析

为设计一种适用于矿用节能双级振动筛振动规律的弹性联接装置,针对矿用节能双级振动筛结构特点,利用移植创新法,建立了矿用节能双级振动筛组合弹簧的结构模型并制作了测试样品。为验证设计可行性,对制作的样品进行了刚度、阻尼系数、阻尼比等力学参数的测试,测试研究结果表明,组合弹簧比橡胶弹簧具有更宽的线性范围和更高的传递效率,较金属弹簧具有更优的阻尼系数,综合力学性能优良,方案设计合理,方法可行。     

并联振动筛与直线筛筛分效果的试验比较研究

首先介绍了并联振动筛和直线筛2种试验样机的工作原理及设计试验方案,提出用透筛率p和筛分效率η2个指标衡量筛分效果;然后从同量物料的完全筛分、同量物料在不同时间段内筛分两方面进行试验比较论证,试验表明,并联振动筛的筛分效率、透筛率分别比直线振动筛约提高10%、15%;最后利用ZRN-500型数字扭矩仪精确测定了并联振动筛的输出扭矩曲线,为其驱动电动机的选择提供了依据。     

最新筛分技术──DZ型系列低频振动筛

最新筛分技术──ＤＺ型系列低频振动筛低频振动筛是无锡市振动机械厂和中国矿业大学矿山机械研究室联合设计制造的一种高效、节能筛分设备。１９９２年１０月。通过了由能源部科技司组织的鉴定。低频筛的特点是采用低频率、大振幅、垂直抛射角以实现物料的筛分；使用新型...     

最新筛分技术──DZ型系列低频振动筛

最新筛分技术──ＤＺ型系列低频振动筛低频振动筛是无锡市振动机械厂和中国矿业大学矿山机械研究室联合设计制造的一种高效、节能筛分设备。１９９２年１０月，通过了由能源部科技司组织的鉴定。低频筛的特点是采用低频率、大振幅、垂直抛射角以实现物料的筛分；使用新型...     

最新筛分技术──DZ型系列低频振动筛

最新筛分技术──ＤＺ型系列低频振动筛低频振动筛是无锡市振动机械厂和中国矿业大学矿山机械研究室联合设计制造的一种高效、节能筛分设备。１９９２年１０月，通过了由能源部科技司组织的鉴定。低频筛的特点是采用低频率、大振幅、垂直抛射角以实现物料的筛分；使用新型...     

矿用振动筛中驱动轴的模态特性分析

为了避免矿用振动筛在工作过程中发生共振以及造成筛体的损伤,对振动筛的驱动轴进行模态分析,获得了驱动轴的固有频率和模态振型。经过分析研究,表明该驱动轴的动态特性良好,能避免驱动轴驱动振动筛产生的振动频率与工频发生共振,同时为分析振动筛的损伤提供了理论依据。     

一种多自由度-刚柔耦合筛分机械的构型设计与分析

针对振动筛是一种通过柔性关节连接浮动中心刚体和挠性附件(如弹簧、阻尼器等)组成的刚柔耦合复杂系统,在筛面采用不同的运动形式时,将影响系统的稳定度和筛分能力。基于模块化理论,提出一种多自由且自由度间存在强耦合的振动构型,对其结构特点、筛分原理和设计理念进行了分析,并在理论上解析了筛面不同方向的运动学参数。建立虚拟样机进行仿真分析,验证了所提出的构型通过改变耦合传动比能灵活地调整筛面的运动轨迹,筛面的小幅振动有利于提高筛分效率。     

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。