改进DQBH─660／200Z型真空起动器控制电路

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也谈改进DQBH－660／200Z型真空起动器控制电路

也谈改进ＤＱＢＨ－６６０／２００Ｚ型真空起动器控制电路山西晋普山煤矿王正明看了１９９５年第２期《煤矿机电》上改进ＤＱＢＨ－６６０／２００Ｚ型真空起动器控制电路一文，也想谈点看法，供参考。上海矿用电器厂生产的ＤＯＢＨ－６６０／２００Ｚ型真空起动器，其控...     

真空电磁起动器控制回路的完善

继本刊１９９５年第６期发表的“也谈改进ＤＱＢＨ－６６０／Ｚ型真空起动器”的改进措施，进一步提出了更完善的方法，并对ＱＣＺ８３－１２０／２２５ｇ２Ｂ（ｇ３Ｂ）型提出新的控制方案。     

三台起动器控制两台大功率双速电机

三台起动器控制两台大功率双速电机铁法矿务局苏景安铁法矿务局晓南煤矿Ｓ１－７２２综采工作面，面长２００ｍ，使用张家口煤机厂研制的ＳＧＺ－７６４／５００型双速刮板输送机，电控系统是徐州煤机厂生产的ＱＳＳＢＨ－２００型双速双回路组合开关（额定电流２×２００...     

矿用电磁起动器微机控制与保护的研究与应用

介绍了ＱＢＺ－４００／１１４０Ｃ矿用隔爆型真空电磁起动器，采用微机实现各种控制与综合保护及故障显示与报警等功能。     

矿用隔爆型可逆电磁起动器性能改造

介绍了矿用隔爆型可逆电磁起动器改造为ＢＱＤ４－８０型矿用隔爆型可逆真空电磁起动器的具体操作。并对后者的主要技术指标，综合电气性能及应用情况作了较为详细的分析介绍。     

矿用真空电磁起动器有了换代产品

兖州矿业（集团）公司机械制修厂研制的ＱＢＺ系列矿用隔爆型真空电磁起动器,具有良好的安全性能和电气性能,延长了设备的使用寿命,达到了国内的先进水平,是一种更新换代的产品,已经由专家通过了技术鉴定。该系列真空电磁起动器是综合了国内各种产品的优点而设计出来...     

煤炭工业安全标志产品发证最新信息 2001年12月25日～2002年1月14日获安全标志证书产品及企业名录

企业全称产品名称型　　号　安标编号终止日期鱼台县银河泵业有限公司矿用隔爆型电动潜水泵ＢＱＸ2 5 - 1 5 - 2 2 2 0 0 1 2 0 2 3 2 0 0 6 - 0 6 - 2 5鱼台县银河泵业有限公司矿用隔爆型电动潜水泵ＢＱＸ30 - 30 - 5 5 2 0 0 1 2 0 2 4 2 0 0 6 - 0 6 - 2 5峰峰矿务局薛村矿集体企业公司螺纹钢式树脂锚杆金属杆体 2 0 0 1 2 0 2 5 2 0 0 3 - 1 1 - 30甘肃矿用电器厂矿用隔爆型可逆电磁起动器ＢＱＤ7- 80Ｎ 2 0 0 1 2 0 2 6 2 0 0 6 - 1 1 - 30甘肃矿用电器厂 矿用隔爆兼本质安全型真空　电磁起动器 ＢＱＪＺ - 2 0 0 / 1 1 4 0 2 0 0 1 2…     

煤炭工业安全标志产品发证最新信息 2002年1月18日～2002年1月30日获安全标志证书产品及企业名录

企业全称产品名称型　　号发证编号终止日期淮南矿山电器总厂 矿用隔爆型照明信号综合保护装置 ＢＺＸＺ -4 2 0 0 2 0 192 2 0 0 6-0 6-3 0淮南矿山电器总厂矿用隔爆型电磁起动器ＱＣ83 -80 2 0 0 2 0 193Ｐ 2 0 0 6-12 -3 1淮南矿山电器总厂矿用隔爆型电磁起动器ＱＣ83 -60 2 0 0 2 0 1942 0 0 6-12 -3 1淮南矿山电器总厂矿用隔爆型可逆电磁起动器ＱＣ83 -60Ｎ 2 0 0 2 0 195 2 0 0 6-12 -3 1淮南矿山电器总厂矿用隔爆型可逆电磁起动器ＱＣ83 -80Ｎ 2 0 0 2 0 1962 0 0 6-12 -3 1淮南矿山电器总厂矿用隔爆型馈电开关ＤＷ 80 -2 0 0 2 0 0 …     

QJZ315／1140型矿用隔爆兼本安型真空电磁起动器的研制

本文介绍了最新研制的ＱＪＺ３１５／１１４０型矿用隔爆兼本安型真空电磁起动器的结构、性能、主要技术参数、特点和工作原理。     

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。