基于CAN总线的矿用智能继电器板卡系统设计

提出一种矿用智能继电器板卡系统的设计方案,详细介绍了板卡系统的组网方式、板卡控制芯片选型与设计、上下位机通信协议设置以及各种关键问题的解决方法。该系统具有容量大、设计新颖以及可靠性高等特点。     

基于CAN总线技术的液压支架控制系统设计

针对综采工作条件,基于总线技术,对液压支架控制系统的总体结构,数据采集系统以及下位机控制系统组成等进行了设计与分析。根据CAN网络通信总线的特点,研究了上位机通讯与监控要求,建立了上位机工作任务。根据串口通讯特点,设计了数据传输程序。     

Modbus在自动检测系统中的研究及应用

针对在自动检测设备中上下位机通讯可靠性的问题,研究了Modbus协议的基本原理及其主要功能码组成,完成了支持Modbus通讯的硬件电路和软件流程图设计。采用了基于时基的判断方法,有效地处理了数据传输串是否结束判断的问题。由于下位机检测设备采用了符合工业标准Modbus协议,因此对市场上现有的组态软件、触摸屏、智能仪表等产品的兼容性非常好,同时保证了数据传输的可靠性。     

多线程串行通信技术在张力无线监测中的应用

为了解决监测系统多串口通信实时性问题,采用了并发串行通信软件设计思想,主要介绍了上、下位机的接口电路、通信协议及通信软件的设计。结果表明,应用程序运行效果良好,对实时串口通信软件开发具有实用意义和参考价值。     

基于LabVIEW与S7-200系列PLC的串口通信研究

为提高煤矿注水降尘的自动控制效果,根据现代工业自动化系统设计的需求,针对LabVIEW与S7-200系列PLC之间进行了串口通信研究设计。通过采用VISA技术以及状态机的设计模式,实现上位机与PLC在自由口模式下的串口通信,使得PLC采集的数据得以实时显示和记录。该系统在井下运行过程中,上位机与PLC之间具有良好的通信功能,满足了设计要求。     

基于内嵌汇编语言的PC机与单片机串口通信

在分析对比VC + +编写PC机与单片机串口通信程序方法的基础上 ,论述了在VC ++ 6.0中用内嵌汇编语言操作PC机串行端口实现串口通信的方法 ,并给出了上下位机的通信程序。这种编程方法 ,对于开发其他的PC机系统接口具有参考价值。     

基于C#的磨机监控系统设计

针对选矿厂磨矿过程中磨机负荷难以实现自动控制以及OPC技术数据传输存在弊端这2个问题,利用VS编程软件设计了基于C#的磨机监控系统。根据实际生产的需求以及监控系统的要求,在该监控系统中设计了设备运行状态显示,磨机运行数据曲线绘制,手动、自动、专家、优化4种控制方式,人机交互的编辑和操作菜单功能模块,以及运行数据存储等功能,同时利用C#本身拥有的串口通信技术,实现了磨机控制仪与监控计算机间的数据传输。运行效果表明,该系统满足磨机自动控制要求,并具有开发成本低,可靠性强,控制方式灵活等优点。     

基于CAN总线的井下模拟量检测

针对井下数据采集和通信所存在的问题,设计了一种模拟量检测及CAN总线通信方法。该系统以TMS320F28335为核心处理器,AD7764为数据采集芯片,将采集得到的2路模拟信号数据存储在DSP片内RAM中,利用e CAN模块与具有CAN接口的上位机进行通信。在该系统中,2片AD7764相互独立,分别与DSP的2个多通道缓冲串口(Mc BSP)直接相连,减少了总线的占用。实验结果表明,该系统可实现对2路模拟数据的采集以及和PC的CAN总线通信。     

基于LabVIEW的液压支架监控系统通信方法

针对综采工作面液压支架监控系统结构复杂、通信冗余性差的问题,根据LabVIEW软件的串口配置和双RS485结构,提出了一种基于LabVIEW软件的液压支架监控系统通信方法。该方法通过设置LabVIEW串口配置中奇偶校验位为0校验和1校验,与RS485总线模式下的数据帧和地址帧匹配,实现基于LabVIEW的多机通信。该方法采用基于LabVIEW的双总线设计方案,利用双总线通信线路的切换实现了通信系统故障的自动诊断和故障段的自动隔离等功能,提高了通信系统的可靠性和冗余性,适应于工业现场的监测和控制系统。     

矿用变频调速一体机CANopen通信技术研究

针对刮板输送机使用的变频调速一体机协同控制所需通信系统不完善、开放性差等情况,提出了基于CAN通信标准协议——CANopen规范的一体机协同控制通信系统设计方案,分析了CANopen标准通信协议的规程,利用监控单元嵌入式微控制器STM32F407的串口外设驱动CANopen集成通信单元GCAN-305,完成了矿用一体机CANopen通信接口的软硬件设计。实验表明,基于GCAN-305开发的通信接口符合CANopen协议规程,可满足矿用一体机协同控制数据通信可靠性与标准化的需求。     

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