基于PLC的矿用立井箕斗定重装载系统研制

针对老主井箕斗提升不能实现定重装载的问题,介绍了基于PLC控制的液压式箕斗定重装载系统的原理、结构以及工作流程,并对液压系统各参数进行了设计、计算,阐述了PLC及模拟量输入模块的选型与I/O点数的确定,建立了PLC控制的硬件接线图及相应的控制流程图,有效提高了箕斗提升的自动化程度和生产安全性。     

基于OPC的远程多PLC实时监测系统的设计与实现

针对工业控制领域中对多个PLC控制设备进行远程实时监测的应用需要,采用OPC技术,提出一种面向多PLC的远程实时监测系统的设计方案。以西门子的PLC为例,对系统进行了实现。在微软的.NET平台上用C#语言实现了OPC的数据通信。系统应用结果表明,系统能够稳定地实现对多个PLC的远程实时监测。     

电流判断法防箕斗累积重装事故的技术研究

双箕斗单绳缠绕或多绳摩擦式提升机正常情况下是一个箕斗额定载荷上提,另一个箕斗空载下放,当箕斗运行到某一固定位置时,电机电流基本是一个定值。但如果下放的箕斗并不是空的(有余煤),电流会比上述定值小。一旦发现电流异常后,便不允许下放到位的箕斗装载,这便是电流判断法防范箕斗累积重装事故的技术,其特点是不需额外投入,判断准确率高,防范效果好。     

基于LabVIEW和PLC的电铲电机参数远程监测系统

针对国内大型露天矿山电铲电机参数多数不能实现实时监测的难题,基于LabVIEW和PLC开发了电铲电机工作参数远程监测系统,系统硬件采用传感器和PLC以及触摸屏一体机;软件采用LabVIEW开发数据监测系统,采集得到的数据通过4G网络传输到云服务器数据库,用户通过访问客户端实现远程监测。结果表明：该系统可以有效地远程监测电铲电机运行的实时参数,人机界面友好,具有较强的实用性和可靠性。     

箕斗提升防二次装载监测系统的实验研究

通过实验室功能实验台对箕斗提升过程的模拟,对箕斗提升防二次装载监测系统进行了功能模拟实验,实验表明,所研发的防二次装载监测系统能够完成对钢丝绳张力监测、超重报警、钢丝绳张力不平衡报警、未卸空报警及信息存贮等功能,其无线通信方式、硬件、软件基本上达到了系统设计功能要求,能实现对多绳提升系统箕斗防二次装载、防钢丝绳张力不平衡等保护功能。     

基于AJAX技术的矿井瓦斯抽放监测参数网络发布

基于煤矿对瓦斯抽放数据实时监测与控制的需要,研究基于PLC的瓦斯抽放监测系统,将瓦斯抽放系统传感器采集的信息经过系统下位机PLC控制系统程序处理,传送到上位机服务器端数据库,通过网络发布技术将数据库中的参数实时发布到煤矿企业的局域网,以Web网页的形式将监测信息呈现,实现对瓦斯抽放实时参数的远程监测与控制。     

基于OPC技术的箕斗提升装载系统设计

箕斗提升采用的定容、定时装载控制方式,极易造成装载过轻、过重或煤炭外溢等问题,影响提升能力和工作可靠性,煤矿安全规程第382条规定,箕斗提升必须采用定重装载方式.采用PLC为核心的电液控制方案可实现自动装载和工况实时显示.     

基于无线传输的箕斗卸载检测装置的设计

对煤矿主井箕斗的卸载情况进行检测,可以有效避免由于箕斗重载下放而引起的事故.针对目前传感器检测方式存在的受环境影响大、免维护性差、安装调试不便等诸多缺点,论文提出一种主从站结构形式的检测装置,从站采用γ射线来检测箕斗卸载情况,并通过无线传输方式将检测结果传送给主站;主站与提升系统的PLC控制回路相连,从而避免了箕斗重载下放情况的发生,保障了煤矿的安全生产.     

PLC在箕斗液压卸载系统中的应用

通过对箕斗液压卸载控制系统的研究,阐述了PLC应用在其系统的设计思路,程序设计原理.     

基于激光检测技术的红阳二矿主井提升机闸间隙监测系统

介绍了红阳二矿主井提升机闸间隙监测保护装置技术改造和系统实现;系统采用高精度激光位移传感器,对闸瓦闸间隙、闸瓦磨损值、弹簧疲劳和闸盘偏摆等位移信号进行检测,转换成4～20 mA电流信号传输给PLC的模拟输入端口,PLC对数据进行实时读取、分析、换算,转换为便于显示的数值,超过设定值发出声光报警信号。实际应用证明了装置具有灵敏度高、抗干扰能力强、工作可靠等技术特点。     

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     

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.     

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     

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     

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.