Design And Realization Of Cold Rolling Mill Annealing Furnace PLC Control System

The Continuous Annealing production Line is the main line for automobile steelproduction in cold rolling mill,the annealed products will be directly supplied to auto manufacturer for further processing.The annealing furnace is the core equipment in the continuous annealing line,it will heat the strip to its required heating temperature and through such process as heat keeping,cooling and quench.Finally to achieve its heat treatment required process.The stable annealing process is vital to the strip's surface quality and property.So the stability of its control system is extremely important.This furnace chose PCS7 as its PLC control system main body.It controls the drive equipments via site Bus technology.Controls the pyrometer,tension meter,electrical heater and communicates with the annealing line and other remote equipments via industrial network(TCP/IP).And we newly added a ring loop fiber optics between the PLC and its four remote IO stations to guarantee the communication is prompt and stable.At last,by designing and realizing its friendly human machine interface(HMI)to let the system be automatic and intelligent.The No.2 vertical annealing furnace in plate mill plant of Xi Chang steel and vanadium limited corporation of Pan Gang Group is the research object in this paper.Through modeling and analyzing the combustion system,tension control and pressure control of the furnace.with my installing and commissioning experience of the NO.1 furnace which is already put into use.It mainly describes how to design and realize the annealing furnace PLC control system.And via optimizing the double cross control's temperature involving point of combustion system,Adding furnace chamber damper opening degree regulator,Optimizing the VVVF Fans increasing and decreasing slop,Regulating chamber valves' PID factors and comparing the calculated and actual tension inside the furnace.Tests and checks its whole control system's predefined functions by commissioning and hot run.The result shows : this furnace control system can realize it's continuously running abilities with such functions as stable,accurate,fast and safe.It also provides accurate data for further technology improvement and new products development of this line.