潘三矿副井电控改造系统调速电路的动态校正设计

本文阐述了Ｆ－Ｄ系统电控改造方案的实现，采用ＳＣＲ－Ｆ－Ｄ电力拖动，对原有调速回路改造，给出了调节电路的动态校正设计。     

潘三矿副井电控改造系统调速电路的动态校正设计

本文阐述了Ｆ－Ｄ系统电控改造方案的实现，采用ＳＣＲ－Ｆ－Ｄ电力拖动，对原有调速回路改造，给出了调节电路的动态校正设计。     

副井提升绞车的可调闸闭环保护

<正> 我矿副井提升绞车采用的是 JKMK/J-20ⅣⅠ电控系统。由于该电控系统的工作闸完全是手动控制,这对于经常提升人员的副井绞车是非常不安全的。我们认为,它主要有以下三个方面的缺点:①由于副井绞车的载荷变化范围很大,因此,造成绞车的运行速度也发生变化,绞车运行不安全;②绞车减速完全依     

改造直流提升机行程及主令保护系统

永煤集团陈四楼矿副井选用洛阳矿山机器厂生产的ＪＫＭＤ -３．５×４型绞车。该绞车采用直流拖动 ,主电机容量１１５０ｋＷ (电枢电压６６０Ｖ ,电流２００５Ａ)。原电控系统调节保护部分采用模拟电路调节 ,行程及主令控制部分采用继电器控制 ,在运行中曾出现下列问题 :①行程及主令控制部分的继电器系统体积大 ,接线复杂 ,查找故障困难。②电控系统不能直接指示故障类型及故障发生点 ,维护和检修时间长。③行程保护可靠性差 ,罐位不好控制。针对这一情况 ,公司增加了一套全数字电控系统 ,采用德国西门子公司的ＳＴ -４００型可编程控制器…     

数字化电控在矿山提升系统改造中的应用

通过对原老式交流拖动绞车电控系统存在问题的分析,使绞车电控系统更好的为煤矿生产服务,提出了绞车电控系统数字直流化改造的方案,叙述了改造后电控系统的基本原理、功能以及所具有的各种保护,介绍改造运行后的绞车电控在安全运行性能、创造经济效益方面所具有的优势。     

TKD—A电控系统故障诊断的元件匹配法

ＴＫＤ—Ａ电控系统故障诊断的元件匹配法山东矿业学院钱宝光，史大光，于修我国目前大部分中小型矿井采用交流拖动提升机，其电控系统为ＴＫＤ—Ａ系列。该电控系统线路复杂，元器件分散，触点众多，出现故障时，排除较困难。笔者研制开发的ＴＫＤ—Ａ系列电控系统故障诊...     

翟镇煤矿主井提升机电控系统改造

翟镇煤矿主井提升机电控系统改造新汶矿务局翟镇煤矿韩树华关键词提升机电控系统低频拖动高压换向器１问题的提出翟镇煤矿设计年产量为１２０万ｔ，１９９３年投产。主井绞车为ＪＫＭ３．２５×４（Ⅱ）型摩擦式绞车，提升高度６４２．５ｍ，箕斗为ＪＤＳ－１２／１１０×...     

邢东矿井副井绞车电控装置

介绍了邢东矿井副井绞车电控装置的系统组成，控制性能及特点。     

古城矿副井绞车晶闸管直流电控系统扩容改造

副井绞车晶闸管直流电控系统于1998年投入运行，原系统的设计容量是按照武汉煤炭设计院所提供的负载图和系统的运行速度图而定。提升机的最大提升净负荷为5000kgf，设计最大运行速度为7．9m／s。     

煤矿机电设备工作中出现的几点问题与改进

根据从事煤矿机电工作多年的经验,对日常工作中出现的以下几点问题,采取了一定的解决办法,实际运用效果良好。１绞车调绳离合器脱开失控问题１．１问题产生及原因分析朔里煤矿副井提升机为单绳缠绕式提升机,电控系统采用ＴＫＤ－Ａ系统,绞车调绳离合器采用径向齿块式结构,曾经出现一次绞车正常运转过程中调绳离合器脱开、活滚筒失去控制事故,后经司机及时发现,果断采取措施,未发生严重后果。经调查,机修工对绞车进行过调绳操作,调绳离合器经调绳结束后,未完全合到位,如图１所示。径向齿块受力Ｆ,沿轴向和径向分解为力Ｆ１、Ｆ…     

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.     

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     

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.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

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     

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