Ventilation Door's Automatic Control System Based on PLC and Rotary Encoder

According to the situation of the ventilation's door in NO.3 coal mine of JINING can not open and close fully in place, and it is easy to cause accident hidden danger, this paper puts forward four kinds of solutions and uses the automatic control system based on PLC and rotary encoder. Field operation shows that the system is running stably and the ventilation door can open (close) reliably. This automatic control system greatly improves the safety of production in coal mine.