为带式输送机重锤张紧滚筒提供启动圆周力的设想

针对水平输送的带式输送机,提出一种设想:采用重锤张紧装置时,在输送机负载启动时为张紧滚筒提供一个短时的圆周力,希望能够有效地减小输送带张力和张紧装置张紧力。对此设想做了相关理论分析和实例计算。     

带式输送机输送带的张紧力分析、计算及张紧装置的选取

分析了带式输送机输送带张紧力的变化规律,从输送带能靠摩擦力传动,而不打滑的条件和输送带在两辊之间的悬垂度条件对张紧力作了简单计算,进而介绍了张紧装置的类型和选取原则。     

带式输送机梯度调速系统研究

针对目前带式输送机智能控制系统根据煤流量实时变化连续频繁调速导致的输送带易磨损和疲劳损伤问题,基于张紧力变化率和煤流量设计了一种梯度调速控制系统。通过采用有限元法建立带式输送机动力学模型计算滚筒处输送带的张紧力,结合检测装置实时获取的煤流量信息和输送带速度,采用模糊控制器实现带式输送机梯度调速。应用结果表明,该系统在负载波动较小时不改变输送带速度,负载变化较大时梯度调速,能够降低输送带磨损和疲劳损伤。     

带式输送机低速张紧绞车设计

针对大功率带式输送机张紧装置张紧力不足的问题,提出了一种采用低速张紧以获得更高张紧拉力的低速张紧绞车。设计采用蜗轮蜗杆传动配合齿轮减速实现较大减速比,最终以获得高张紧力的设计目的。新型张紧绞车结构简单、传动可靠,能够很好地满足带式输送机的张紧需要,可运用于大功率带式输送机输送带的张紧。     

合理选择带式输送机输送带的张紧力

介绍了鲁西煤矿1#上运强力带式输送机在调低输送带张紧力后,带式输送机出现的起动时常伴有刺耳异音、驱动段改向滚筒磨损速率加快等“异常现象”;通过在带式输送机现场认真的观察、分析、实验,找出导致“异常现象”发生的原因,提出通过实验合理选择输送带张紧力的处理办法,较好地解决了输送带张紧力调整所引发的问题。     

大型带式输送机制动与张紧装置的最优设置

通过近水平和上运大型带式输送机制动工况和起动工况的张力分析,明确了制动装置位置对输送带张紧力的影响,进而提出大型输送机制动与张紧装置的优化布置方法。     

基于PLC的胶带张紧力比例控制系统的设计

长距离带式输送机是矿山、港口、电厂等工况连续运输物料的主要设备，而且随着生产程度的提高，其长度在不断加大。由于胶带在物料的作用下发生弹性变形，使其与滚筒之间的摩擦力不能启动胶带，从而影响了正常运输。因此在运输物料的过程中必须对其施加足够的张紧力，保证胶带与滚筒之间的摩擦力大于胶带受到的摩擦阻力。常规使用的螺旋张紧、重锤张紧和绞车张紧等输送带张紧装置，很难满足输送带在正反转及不同阶段(启动阶段、运行阶段和停机阶段)张力可调的要求，即启动阶段满足带式输送机的动态防滑要求而使张紧力较大以增大摩擦牵引力，等速阶段张紧力降低以维持输送机的正常运行。而且以往的张力控制精度较低，因此降低了输送带的使用寿命。     

带式输送机输送带张紧力及张紧装置

介绍带式输送机输送带张紧力的计算及张紧装置的作用、类型及安装时需要重点考虑的因素,对张紧装置在各种带式输送机中的选用以及安装过程中应该注意的事项做了详细的介绍。     

带式输送机缓冲托辊的改进

<正>带式输送机主要由电动机、减速机、传动滚筒、输送带、改向滚筒、槽形托辊和缓冲托辊等组成,其中缓冲托辊通常安装在出料口,主要作用是减     

固定式张紧装置预紧力精确计算方法

通过分析确定固定式张紧装置输送带预紧力所依据的原理,给出了带式输送机固定式张紧装置输送带预紧力的精确计算方法。     

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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