The on-line monitoring system of ventilation equipment distribution is a device based on the flow monitoring method of large fans. This system is based on the national standards "Aerodynamic Performance Test Method of Fan", "Coal Industry Standard" and "Field Performance Parameter Measurement Method of Main Fan in Coal Mine". It applies industrial computer detection technology and unique proprietary research results to continuously measure and process the running state of large-scale fans in coal mine, and provides various data of the running state of fans in various ways, which not only ensures the safe operation of fans, but also facilitates the performance test of fans and provides convenient conditions for the expansion of various functions. On-line measurement and processing of operating parameters of Hao15 99695110 fan include static pressure at fan inlet, wind speed, flow rate, motor bearing temperature, stator winding temperature, motor power, motor vibration intensity, fan speed, inlet and outlet gas temperature, etc. This data transmission mode can realize flexible and convenient data networking with the whole mine automation system, and transmit the real-time operation parameters of the fan to the mine general dispatching room to meet the requirements of automatic management. The on-line monitoring system of ventilation equipment distribution can track the running state of ventilation equipment in the production process at any time, change the traditional equipment management mode, improve the automatic management level of ventilation equipment, effectively ensure the economical and reliable operation of ventilation equipment, and provide reliable scientific basis for equipment management and maintenance, which is well received by users. The system has perfect measurement and control function, colorful pictures and reports, which is convenient for field operators to use and maintain. 1. The main functions of the system function system include: real-time monitoring of ventilation system parameters, fan performance parameters, motor electrical parameters, bearing temperature, data management, report management, performance testing, remote communication, etc. , as follows: real-time monitoring of wind pressure and air volume of ventilation system. ? Real-time monitoring of ventilator performance parameters: flow, static pressure and efficiency. ? Real-time monitoring of electrical parameters of fan motor: current, voltage and power. ? Monitor the bearing temperature in real time and give an alarm when it exceeds the limit. ? Monitor the stator temperature in real time and give an alarm when it exceeds the limit. ? Real-time display, storage, query and printing of data. ? Historical data report query. ? Real-time display of wind pressure-air volume and efficiency-air volume curves. ? Data mining * * * Enjoy 2, technical indicators? Working voltage: ~ ~220V 10%%? Ambient temperature:-10℃~ 50℃? Environmental humidity: ≯85%? Transmitter accuracy: ≮0.5 Monitoring accuracy:? Flow: 1.5? Compressive force: 0.5? Electrical parameter: 0.25? Temperature: 0.5? Vibration: 1. 3. Monitoring parameter range? Flow: 4000 ~ 125000m3/min? Compressive force: 0 ~ 6000 pa? Temperature: 0 ~ 150℃? Electrical voltage: 0 ~ 10 kV? Current: determined by transformer? Work rate: unlimited? Vibration: 0 ~ 50 mm/s 4. System characteristics? The flow monitoring method is unique and novel, with good reliability and high precision. ? Real-time data display, real-time acousto-optic alarm for parameter overrun. ? Adopt advanced computer technology, powerful and intelligent; Using graphical interface to display working status is rich, intuitive and vivid. ? The system adopts modular design scheme, which has strong anti-interference ability, high running precision and convenient use and maintenance. ? Adopt advanced computer technology and network technology to realize data sharing of the whole mine. ? Adopting various anti-interference measures, the system has strong anti-interference ability, high reliability and accurate monitoring. ? Choose sensors (transmitters) with good reliability and high precision. ? The security of software design is high. Simple and quick operation and convenient maintenance. 5. The system is composed of PLC, which is mainly composed of signal measuring device and sensor (transmitter), signal acquisition and conversion device, communication device, power supply device and display. Signal measuring devices and sensors (transmitters) mainly include pressure measuring devices, analog collectors, pressure transmitters and temperature collectors. The signal acquisition and conversion device mainly includes filtering link and voltage/current conversion. Communication equipment mainly includes 10mbps/ 100mbps adaptive network card. The power supply device mainly includes AC regulated power supply. 6. Working principle of the system The system consists of PLC as the core and various peripheral devices. Under the control of the software, data collection and analysis are completed, displayed on the display in various forms such as charts, and transmitted to the designated place. The working process of each part is briefly described as follows. Monitoring of electrical parameters Electrical parameters refer to the current, voltage, power and power factor of the motor. Select high-precision and reliable electric quantity acquisition module to convert voltage and current from voltage and current transformers into standard electrical signals, and then send them to computer for processing. Monitoring of gas flow in the system, the monitoring of gas flow is calculated according to the dynamic pressure formed when the gas flows through the variable cross-section member. Monitoring of fan vibration The absolute peak value of fan bearing vibration is continuously monitored and measured by electromagnetic vibration speed sensor. The rotational speed is monitored by the Hall effect. When the metal teeth pass through the front end of the Hall sensor, the magnetic field changes. Hall element detects the change of magnetic field and converts it into AC electric signal. The built-in circuit of the sensor amplifies and shapes the signal and outputs a good rectangular pulse signal. The measuring frequency range is wider and the output signal is more accurate and stable. Simple installation, oil-proof and waterproof. Signal acquisition and conversion data are collected by various integrated modules, sent to PLC for processing, and finally displayed by computer. The system power supply adopts DC power supply, which supplies power to various transmitters and sensors through switching power supply.