大型矿井巷道贯通测量方法与误差分析

根据51001回采巷道贯通的特点,制定了贯通测量方案,采用误差估算法对测量方案进行验证,同时指出了巷道贯通测量过程中的误差控制措施。巷道贯通后的各项精度控制指标表明,制定的巷道贯通方案及精度控制措施是切实可行的,能满足长距离巷道的贯通需要。     

煤矿井下巷道贯通测量精度分析及技术方法研究

井下巷道贯通工程对贯通测量精度的要求极高,加之施工环境相对复杂,因此需要根据巷道的实际情况规划贯通测量方案。分析了贯通测量技术在煤矿井下巷道建设中常用的技术方法以及相应的精度影响,并提出了提高贯通测量精度的有效措施。     

提升煤矿井下巷道贯通测量精度的实践分析

煤矿井下巷道贯通测量的质量对整个矿井生产的影响较大,全面提升煤矿井下巷道贯通测量精度较为关键。本文将郭庄煤矿井下贯通测量作为实际分析案例,对比选择了贯通测量方案,分析了本次矿山测量的精度要求,设计了地面、井下的平面控制、高层控制方案,计算得到贯通误差预计均小于设计精度,为现场贯通施工提供了依据。     

提高煤矿特大型巷道贯通精度方案研究与应用

巷道贯通测量是矿山测量工作中一项重要内容,是保证煤矿井下巷道工程准确施工、保证煤矿安全稳定生产的前提。在巷道贯通测量中必须确保每一项测量参数精准,特别是在特大型巷道贯通测量中,一旦出现测量精度误差,很容易造成巷道贯通偏差,甚至造成重大煤矿安全事故及经济损失。以西山煤电集团东曲矿1211皮带运输巷贯通测量为例,浅析了提高特大型巷道贯通测量精度施工方案,力求保证巷道安全顺利贯通。     

柠条塔超长巷道磁悬浮陀螺导线贯通误差预计方法研究

结合柠条塔超长巷道贯通测量工程项目进行贯通误差预计,提出改进导线观测方案,将磁悬浮陀螺定向测量应用到超长巷道贯通测量方案设计中,选择合理方案施测。巷道贯通后进行联测,巷道在主要方向上偏差0.072m,次要方向上偏差0.036m,巷道贯通测量方案设计合理,贯通精度优良。该超长巷道贯通测量工程的高精度贯通对今后的此类贯通测量工程有一定的借鉴作用。     

优化测量方法 加强测量管理 提高巷道贯通精度

贯通测量是煤矿测量重要工作之一,贯通精度的要求根据巷道用途确定。合理确定测量方案、方法和布置导线形式对巷道准确贯通十分重要。     

特长距离高精度巷道贯通测量方案设计及精度分析

长距离高精度巷道贯通测量技术是保证巷道高精度贯通的首要条件,以河南龙宇能源股份有限公司陈四楼煤矿主副井区与一中央风井区贯通测量为例,根据陈四楼煤矿实际生产情况及地质条件,对16 km特长高精度巷道测量方案进行了设计,对贯通测量精度进行了分析;通过严格控制井上下联系测量和井下控制测量的各个环节的测量误差保证井巷贯通测量精度。分析结果表明,通过对测量方案的实施和测量精度控制,可确保贯通误差在水平向上不大于400 mm,高程方向上不大于200 mm,为以后大型高精度贯通测量的实施提供了非常有益的借鉴。     

两井间巷道贯通测量方案设计及其精度控制

为保证两井间巷道贯通的精度,在巷道贯通测量中运用GPS技术,对巷道的贯通方案进行分析,并对井筒施工、井下导线、地面动态控制的测量分析,且计算其贯通误差,结果表明:贯通点K在x向的预计总误差是±0.460 m,低于±0.500 m,满足巷道贯通的精度要求。     

巷道贯通测量精度的控制

主要分析了巷道贯通测量误差,重点介绍了巷道贯通测量精度的估算以及提高巷道贯通测量精度的控制措施,这样不仅可以使巷道贯通测量精度得到有效地提升,而且还可以确保矿山的安全生产。通过对巷道贯通测量精度的控制措施进行分析和研究,以期为巷道贯通测量施工的开展提供可靠的保障,确保巷道贯通测量的精度,实现经济效益和社会效益的最大化。     

巷道贯通测量技术研究

巷道贯通方法的选择是巷道贯通测量得以保障的先决条件;测量要求和测量工艺时保障巷道顺利贯通的必要条件;巷道贯通精度是巷道贯通测量的核心。通过对测量方法、测量技术要求和测量精度的提高,可以保障整个巷道贯通测量的圆满完成。     

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     

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     

2014 second batch of rare earth quota released

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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