Because of this , the paper first presents the graphitization process and its equipment of longitudinal wise graphitization ( lwg ) , based on the building of lwg furnace in shanxian xinxin graphitization electrode co . , ltd , henann province . it also introduces the design of automation control system with programming logic controller ( plc ) and intelligent instrument , which can automatically trace the power chart and acquire protective signal 该控制系统采用可编程逻辑控制器( plc )和智能仪表来实现送电曲线的自动跟踪、保护信号的采集，并且采用组态软件和rs485网络实现了数据记录、报表打印、报警处理等功能，提高了石墨化过程的自动化水平和产品质量。
