基于PLC的采煤机运行监测系统研究

采煤机等大型机械设备在煤炭开采过程中经常受到振动冲击的影响而导致安全风险加大,为实现采煤机各个关键点的监测,实现对其运行状态的综合评估,加快系统故障排查和处理速度,设计了基于PLC的运行检测系统.在PLC的控制下系统实现温度、振动信号的采集和ZigBee无线网络传输,电压、电流数据的总线传输和各个节点运行、预警状态和数据显示,有效提高了采煤机系统运行的安全性和工作效率.     

采用PROFIBUS-DP的矿井运煤控制系统设计

提出一种矿井井下运煤系统集中控制的控制方案,采用以S7-300PLC为主站、S7-200PLC和三菱FX2N PLC为从站,通过西门子S7系列PLC的PROFIBUS DP通信与三菱FX系列PLC无协议通信实现数据交换,给出了不同品牌PLC之间数据通信的方法。系统投入运行以来,效果良好。     

智能配电管理系统在吕临选煤厂的应用

为解决吕临能化公司选煤厂以往配电过程中电量参数、设备运行状态数据记录不完善,数据无法实现远程采集,停送电工作效率低等问题,根据已有配电系统使用情况结合互联网技术、PLC控制技术,构建了包含设备运行状态和参数监测系统、PLC综合远程控制系统、无线测温系统、视频轨道机器人自动巡检和定位系统、网管式停送电系统和电子挂牌系统等的智能配电管理系统。系统投用后提升了选煤厂供配电高效化、自动化、智能化水平。     

基于PLC的模拟提升机监控系统研制

设计了一种基于PLC的PWM脉宽调制功能和MCGS组态触摸屏的电机自动控制系统模型。论述了模拟提升机控制系统的组成、PLC和MCGS组态的软件设计。系统以可编程控制器PLC为控制核心,PLC通过A/D转换模块读取作用在钢丝绳上张力传感器的数据,达到确保安全的作用,通过测量旋转编码器的脉冲序列以及数据算法处理,实现提升机运行过程中自加速、匀速和自减速功能。利用工业组态触摸屏MCGS对提升机工作状态进行实时监控,经过实体模型的测试验证证明,系统能够达到设计要求。     

输送机工况数据APP远程监控系统设计

带式输送机自动控制系统在煤炭行业应用广泛,现场工况数据大多存于 PLC 寄存器中,为了适应远程 工业数据监控并将互联网应用在带式输送机自动控制领域,设计了一种基于 APP 的远程工况数据监控系统。 用户可 通过工业 APP 能够随时随地地远程监控现场 PLC 工况数据信息。 PLC 与计算机服务器通过 ModbusTCP 协议进行数 据通信,Android APP 再与计算机服务器通信,最终将输送机控制系统工况数据及运行状态显示在 APP 端。 将该系统 应用于带式输送机自动控制系统领域中,解决了监控系统终端便携性差的问题,能大力减少人力资源成本与时间成 本以及提高安全性。     

基于PLC的矿井泵房无人值守系统设计

设计了一种基于PLC的矿井泵房无人值守系统。该系统采用可编程逻辑控制器(PLC)作为控制核心,利用TCP/IP通信协议实现矿井的信息共享。分别通过传感器和PLC处理器来采集和处理各类数据,从而做出指令的判断并传到执行器。实现了矿井泵房的无人值守,达到了可靠高效的自动化运行。     

基于DSP和PLC的电牵引采煤机电控系统优化设计

针对传统PLC控制存在的数据实时处理效率低、智能控制算法在PLC系统中可植入性差等问题,设计了一种以S7-300 PLC为主控制器、TMS320F2812 DSP为从控制器的电牵引采煤机电控系统方案,详细介绍了PLC硬件系统配置和DSP关键电路设计。优化了S7-300 PLC的控制功能,利用DSP实时监测截割电机运行状态,通过DSP输出为PLC控制提供参考,在不同的生产工况下优化牵引电机状态、摇臂和滚筒位置。该电控系统同时具有PLC和DSP控制的优越性,为采煤机在各种复杂生产工况下高效截煤提供可靠保障。     

面向对象的编程在电动机试验监控系统中的实现

介绍了在博图环境下,基于类和对象的概念,采用对象封装技术(用户数据与功能块的PLC类封装、用户数据与面板的HMI类封装),在电动机试验监控系统中实现面向对象的编程。试验运行结果表明,采用面向对象的编程,使PLC和HMI程序逻辑更清晰,可读性强。     

基于组态王和PLC的QSC014液压实验台改造

提出了利用PLC实现液压系统控制,传感器、PLC模拟量输入通道和组态王实现数据采集,Matlab进行实验数据分析的总体改造方案。实验表明,改造后的实验台操作简便、控制可靠,能够实时监控系统运行,采集的数据准确,分析结果可信度高,更好地满足较为复杂的液压系统的实验要求。     

复杂矿井通风安全监测系统的优化研究

针对西山煤电通风监测系统监测效率低、自动化水平低等问题,具体分析监测系统的运行参数,设计基于PLC的通风监测系统,构建现场监测层、网络通信层、上位机监测管理层三层网络,以PLC主控制器为核心,对数据进行处理和运算,实现最优通风调节。     

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。