基于RS485总线的石墨化过程测控系统设计

采用RS485现场总线技术和网络技术,在MCGS WWW网络版组态软件平台上,设计了一套以工控机为主机的锂电池负极材料石墨化过程实时测控系统.系统的485现场节点整流变压器高压侧电气参数智能采集模块和变压器电动有载调节机构控制器分别完成变压器电气参数的采集和档位控制.设计并实现了一种基于线性光电耦合的二阶低通滤波器,整流器输出电压与电流及其他模拟信号经二阶低通滤波器处理后,由智能采集板卡采样.提出了一种能匹配设定功率曲线的变压器档位自动调控算法,可实现石墨化过程的优化控制.系统主机通过光纤接入企业局域网程控交换机,使系统具有远程监视功能.120多炉次的实际运行效果表明,石墨化过程实时测控系统稳定可靠、操作方便,产品质量稳定,平均炉次的电耗比原系统降低了6%.

Design of Measurement and Control System for Graphitizating Based on RS485 Bus

A measurement and control system for lithium electrode material graphitizing was designed on the basis of the platform of MCGS configuration software, RS485 bus and net technology and with an IPC used as the system host. The measurement and control system contains two 485 nodes. An electrical parameters collector was used to collect Rectifier Transformer's electrical parameters, and a controller was used to control Transformer gears. A second-order low-pass filter was designed on the basis of linear photoelectric coupling. The output voltage and output current of Rectifier and other signals were managed by a signal processing circuit and collected with Intelligent Data Acquisition card. An algorithm of the automatic control transformer gear was presented, which can match the set power curve in real time and implement the optimal control of the graphitization process. System host access the intranet through optical fiber, realizing the function of remote monitoring. This system has been put into use for more than one year, and the operating effect of more than 120 furnaces shows that the system is stable and easy to operate, the quality of product is stable and power consumption declines by 6%.