With the development of modern science and technology, the requirement of automation control degree of production system is increasing. The control process requires more safety and reliability and more complete functions. It needs centralized monitoring, real-time access and automatic analysis of production process information in order to implement the best operation plan. Therefore, according to the technical requirements of the mine and the existing situation of the equipment, the main fan of Dequan Mine is monitored and controlled.
PC bus industrial control system is used in the main fan monitoring system, which centralizes advanced technologies such as industrial computer, intelligent data acquisition, calculation and control, graphics display, image monitoring, network communication and so on. It has the functions of graphic display, centralized display of various information and data, automatic record of historical data, automatic generation of data reports, abnormal alarm and protection shutdown, information networking, printing, etc. It is a high-performance monitoring system with comprehensive functions, strong versatility and good openness. The system has the advantages of high reliability, fast processing speed, high monitoring accuracy, easy operation and low maintenance cost.
The main functions of the system should include at least:
(1) Collecting electrical parameters of ventilation system and operating state parameters of equipment, and realizing interlocking control of ventilator and its auxiliary equipment.
(2) Collecting the operating parameters of the ventilation system [monitoring equipment parameters], monitoring the negative pressure, air volume, wind speed, fan vibration, surge stall, blade angle of the ventilator, and making corresponding control. Negative pressure acquisition requires circumferential three-hole method.
(3) Collecting temperature parameters, monitoring and controlling winding temperature of motor, bearing temperature at both ends of motor, bearing temperature of fan and winding temperature of transformer.
(4) Realize the start-stop control of the electric butterfly valve, and monitor its opening and closing status.
(5) Collecting the current and voltage of the low-voltage cabinet (4-20 mA).
(6) Acquisition of AC output, current, power and frequency (4-20 mA).
(7) Realize the start-stop control of fan frequency converter, and monitor its operation status, light and heavy faults.
(8) Realize the frequency control of fan frequency converter.
(9) It has the functions of sensor signal disconnection, network signal disconnection, fault monitoring and alarming of PLC and its I/O module.
(10) Display ventilation system dynamic flow chart, fan control flow chart, power supply system chart, process parameter table, electrical parameters, equipment operation status (work, stop, fault) and alarm parameter table at the operation station.
(11) The management terminal can be accessed remotely through local area network through industrial Ethernet and mine integrated automation management system networking, through the mine network system server to release data;
Setting different access rights for different users can be divided into Engineer level, operator level, browsing level and so on.
(12) The number of system I/O should be 20% standby.
(13) The system has the functions of real-time alarm and historical alarm. Real-time alarm can display the parameters of each measuring point (such as upper and lower limits). When alarm occurs, the monitoring screen will pop up the alarm screen. At the same time, it has the functions of intelligent information voice prompt and fault voice alarm.
