箕斗载煤量动态监测系统在立井提升中的应用

主井提升系统是煤矿安全生产的重大设备,它的安全与高效运行是保证煤矿安全生产的前提条件。合适的箕斗载煤量直接决定主井提升系统的安全运行。但在箕斗卸载过程中,种种原因会导致箕斗不能卸空。这样,箕斗下一次装载时会导致过装载。从而引发事故的发生。为避免此类事故发生,有效的措施是箕斗载煤量动态监测系统,利用该系统对箕斗卸载状况进行监测。及时发现箕斗不能写空格的危险情况并采取相应补救措施。保证主井系统安全运行。     

主井自动卸载卡箕斗保护装置

根 据矿井主井箕斗提升的特点 ,箕斗在上煤仓卸煤时 ,有时会出现卡箕斗现象。我矿试生产初期 ,各种保护装置不够健全 ,1999年3月1日 ,箕斗在卸载位置被大矸石卡塞 ,信号没有观察清楚就发开车信号 ,当提升机下放至150m时 ,箕斗突然下落 ,造成箕斗断绳坠落的重大事故。使矿井停产6天 ,经济损失近30万元。这种现象是非常危险的。根据这一情况 ,特设计了卡箕斗监测保护装置。此装置监测箕斗卸煤运行状况 ,万一箕斗受卡 ,如果提升机启动 ,此装置就产生保护作用 ,使提升机迅速停止 ,避免事故的发生。提升机司机通过此套装置能够监测出箕斗进出卸载…     

某矿主井过卷重大事故原因分析

淮南矿区某煤矿2005年曾发生主井北绞车西箕斗重载提升，司机在提升过程中得知卸载仓已满，便把重钩提至距卸载点约30m位置停车。后开车起重钩准备将箕斗内的煤卸入仓内，当发现绞车摩擦轮反转便开始施闸和按紧急停车按钮、分主开关，均未能使绞车停车，导致西钩箕斗重载下放，撞坏井底防撞梁，东钩空箕斗上冲，损坏井口楔形罐道，撞坏防撞梁，主绳悬挂装置卡入导向轮，造成直接经济损失约180万元和影响该提升系统约210h正常生产的间接经济损失。     

外动力卸载在箕斗提升上的应用

为了实现矿井主井箕斗提煤能力的合理扩大,以山西霍尔辛赫煤业有限责任公司主井提升系统改造及应用案例,应用形态学矩及功能解析法分析并确定了提高主井提煤能力改造的技术方案,对比了原箕斗曲轨卸煤方式的技术优势。应用实践监测的手段,完成了主井箕斗卸载方式改造后对原煤提升能力及运行稳定性的现场485d连续运行的统计监测,验证了液压外动力卸载是缩短箕斗单次提升循环时间的有效途径,并具有优越于曲轨卸载的动力学特性。     

矿井提升机恒速液压制动系统介绍

以前的矿井提升机,其制动通常采用恒制动力方式,在制动系统调试时,就把所需的制动力整定好,在提升机运行过程中,若发生紧急制动,该制动力不再受载荷变化的影响而恒定不变。该方式适用于提升负载不变的提升系统。但在实际生产过程中,提升机负载经常因各种原因而变化,副井罐笼提升方式尤为明显,即使主井箕斗提升方式也会因某些意外原因使提升负载发生变化,例如自动装载系统因计量装置失灵,使装载量不准,或因装载装置发生故障而使箕斗未装煤而空箕斗,尤其是因卸载失灵而使箕斗未卸煤就下放,造成重其斗下放等。在出现上述类似情况时,若发生紧急…     

箕斗自动卸载电控系统

葛泉矿主井箕斗于１９９６年８月由扇形门式改为插板式后,解决了提升过程中扇形门自动打开造成的提升事故,增大了箕斗容量。但同时箕斗卸载方式也由进入曲轨后自动卸载变为由信号工操作气缸,气缸带动箕斗插板门打开的方式。这种卸载方式由于是人为控制,常由于卸煤位置过低造成漏煤严重,卸煤位置过高时箕斗插板门在卸载完毕后被卡住以及未卸煤下回等情况。为此,设计了一套自动卸载控制系统,较好地解决了这类问题,大大降低了信号工工作强度,在实际应用中取得了非常好的效果。１　自动卸载控制系统说明　　箕斗卸载的动力为压缩空气,…     

某铁矿主井提升箕斗卸载液压系统技术改造实践

通过对河北某铁矿主井提升系统的长期观察和分析,发现该卸载液压站为单油缸作用于箕斗直轨,箕斗到位后拉动直轨进行卸矿。由于水料混合导致箕斗内装矿密度不均致使箕斗重心偏移,同时富有黏度的水炭也增加了打开闸门的阻力,箕斗上提过程中经常出现撞直轨和打不开斗门等现象。为解决此故障,提出了将单缸改为双缸双马达的技术改造措施,同时进一步进行技术改造,解决2个油缸动作的同步性偏差,使开闭闸门更加快速平稳,彻底解决了提升卸载故障,提高了系统安全连续运行效率。     

主井自动卸裁卡箕斗保护装置

根据矿井主井箕斗提升的特点，箕斗在上煤仓卸煤时，有时会出现卡箕斗现象。我矿试生产初期．各种保护装置不够健全．1999年3月1日．箕斗在卸载位置被大矸石卡塞，信号没有观察清楚就发开车信号，当提升机下放至150m时，箕斗突然下落，造成箕斗断绳坠落的重大事故。使矿井停产6天，经济损失近30万元。这种     

煤矿主井箕斗装卸载系统的防过装

中国矿业大学和兖州矿业（集团）有限责任公司通过对煤矿主井直流提升机防止过装、重装问题的研究,找到利用监测提升电流来判断箕斗是否卸空的新方法。经过2a多的实践,再没有出现因箕斗没有卸空而影响生产的事故,确保了提升机安全提升。     

动力卸载箕斗卸空检测及控制方法研究

从简单分析多绳摩擦提升机工作特性着手,论述了动力卸载箕斗卸空检测及控制的必要性,提出了一种可行的卸载过程检测方法。利用卸载密度变化值及其对应的测量时间,比较准确地计算出卸载量,与装载物料量值相比较,准确判断出箕斗卸空与否。在此基础上,设计了基于PLC的动力卸载箕斗的控制方案。     

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     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new