基于MCGSPLC的轮胎硫化温度压力控制系统设计─数据库设计及改进.doc

基于MCGS-PLC的轮胎硫化温度、压力控制系统设计 —数据库设计及改进 摘 要 关键词： MCGS-PLC-based tire curing temperature pressure control system design– Database design and improvement Abstract The curing is an important link of the solid tire production process .Temperature and pressure are two crucial factors in this curing .Using traditional manual control can get inaccessibility of anticipated effect. What the article introduces is the software design and the hardware design of the automatic control system of the solid tire curing production. In this design, the upper position computer and the lower position PLC to is uses realize the monitoring of temperature and pressure in the tire curing produce process. the temperature control precision is±1℃. In this system, it uses two PLC, which link to the same computer, to meet the realization of independent control of two sets of curing productions system. In the curing process, temperature data be picked by thermal resistance Pt100 and be transformed by EM231,then it delivers to CPU224. Pressure data be gathered by far transmission pressure gauge, and be delivered to CPU224 after EM235 transforms, too. All the control parameters are set by the upper computer and transferred to CPU224 before the production. In the production, the host computer receives data and storages it, and plots curved line of the situation of actual temperature and pressure, manages the production and so on. PLC completes the PID control, and the PID result is used for adjusting the admission valve and opening or closing the bleeder valve. When the temperature request can’t be fully satisfied, and the deviation is in the permission scope, PLC will automatically completes the equivalent vulcanization and rings the alarm. When the deviation of hypothesis and actual are too big, the alarm will ring also and conclusion the curing. The system can also be controlled by manipulator when there is something wrong with the auto-control system. MCGS this version of the database do not hav