Zhao Xuehua, a variable frequency speed control system for coal mine air compressors based on air only system. Hu Yongjun. Chen Libing School of Information and Power, China University of Mining and Technology. The frequency conversion technology and the closed-loop automatic control system on Xuzhou 221008 in Jiangsu realize that the air compressor unit automatically adjusts the operating state according to the size of the load. At the same time, the real-time running state of the air compressor is monitored, and the automatic operation of the whole system is realized, which achieves the goal of unattended operation. Introduction The air compressor is the main power equipment of the coal mine. Its safety and high efficiency operation ensure that the coal 1 is normally used for the first time. However, some of the former coal mines have not implemented automatic technical transformation of the mine air compressor. The whole system in the Heng Yun Jin efficiency, low energy waste, serious control method, backward automatic water supply, low gas supply quality, etc. Mainly now, the air compressor is in a long time in the real world, the corpse is loaded or unloaded, so that the motor The efficiency is reduced, accompanied by a large number of power systems using wind time is not unified, the air volume is unstable, and the single-motor drag system with traditional control methods such as contactor relays cannot be continuously adjusted according to the load. The pressure fluctuates greatly above and below, and the adjustment precision is low, which affects the whole system. Because the starting torque of the air compressor is large, the starting current is large. The starting time is longer. And in the automatic loading and unloading, the load suddenly changes, the fire on the power grid, easy to cause overload fleas also have a great impact and damage to the equipment itself.
Therefore, the establishment of a coal mine air compressor frequency conversion speed control system based on only one control is very strong for improving the reliability and safety of air compressor unit operation, reducing operating costs, improving production efficiency, improving the working environment and improving the automation level of the system. Application value.
1 system composition and control process 1.1 system components of the system mainly consists of air compressor frequency converter and pressure transmitter cooling device and electrical parts.
The air compressor body is equipped with an internal controller. The operator can control the single air compressor to start and stop, check the operating status and modify the parameters, etc. through the control number of the control panel, and the internal controller leaves a 485 communication interface. The MqdbusKJ Yingxin protocol inverter provides the 485 communication interface, and has the bus single master multi-slave control function. The user can set the working parameters and read the inverter working status through the jinjin3. The Khan cabinet in the central control system is equipped with a comprehensive protection device and a measurement and control unit. The device provides 485 connection. 1. These intelligent devices can be 485, 1 cold, and the device acts as a slave to communicate and accept the host through the network. The station command then sends the collected parameter data to the station, and the functions such as the remote control.
In order to realize automatic monitoring, the control system should have three functions of centralized centralized control of remote centralized control on site. For this purpose, the control cabinet is configured in the air compressor room, and the 87300 is used as the centralized control station of the system, and the switchgear The air compressor of the medium comprehensive protection device communicates to complete the remote function of the system, realizing the real-time monitoring of the operation of the air compressor; at the same time, it plays the role of data transfer station, and the dispatch center enters the communication to realize the remote monitoring. , the structure of the system, 1.
1.2 System Control Strategy The purpose of system control is to maintain the basic stability of the air pressure in the pipeline regardless of the amount of air used in the wind time. The strategy is to use the motor speed control device and programming; the controller 1 constitutes the control system. Through the pressure sensor and the transmission device, the pressure at the outlet of the wind bag is converted into a standard signal of 4201, sent to the inverter through the internal of the inverter, the function is adjusted, and the output frequency of the inverter is controlled, thereby controlling the running speed of the air compressor. . By detecting the running state of the inverter, the number of running air compressors is automatically adjusted to realize automatic switching of frequency conversion and power frequency, thereby completing the constant supply pressure and forming closed-loop control.
The pressure setting pressure feedback pressure sensor is based on a closed loop control system.
It can be seen from 5. After setting the system card force to 651, the system utilizes and controls to improve the dynamic performance of the system. The basic stability of the system pressure was maintained and a good control effect was achieved.
1.4 Before the control process starts. The working mode selects the frequency conversion bit late, and the technical switch is placed in the running state. 14 air compressor frequency conversion start, speed slave stop 21 air compressor, when the set operation is reached. Time or super, water cut, causing downtime. The system automatically starts the air compressor system control process 6 small.
2 The frequency conversion speed monitoring system realizes that the air compressor unit automatically adjusts the running state according to the load size, transmits data through the network, and remotely monitors the real-time running state of the system.
1 In order to realize automatic monitoring, the system has three methods: manual local centralized control and remote centralized control.
2ç —The local 控制0 touch screen is installed as the man-machine interface in the centralized control. The real-time monitoring of the 7-inch field device is performed in real time, and the fault can be completed and the remote command can be issued. The main interface 7 starts to rise at zero. If the preset upper limit of the frequency reaches 48, the profit is extended, and the pressure at the exit of the wind pack is still able to reach the preset ten-force position 55065. The relay switches the 1 press to the power frequency operation, and at the same time, the 2 = air compressor 1 force is changed to the inverter state and 1! When the air compressor reaches the upper frequency limit, it still cannot meet the requirements after the delay period, and automatically switches the 24-air plane to the power frequency operation hall. 1 frequency conversion start 3 press. When the air volume is reduced, there are 3 air compressors running at the same time, and the air compressor is converted to the operation hall. At this time, the frequency of the inverter drops to the lower limit position 2, and the first factory is stopped! Research and application of emergency communication between the 1st press and even the underground mine personnel Wang Zhiwei, Zhao Jiangping, Zhang Hao, Wang Haiqin, Xi'an Building Science and Technology Institute of Safety Engineering, No. 755, Xi'an, Shaanxi, China The conclusions of the main influencing factors introduce the model principle and content of the emergency communication angle relationship and use its method to conduct practical exercises and training for a mine. The results show that this training method has obvious effects and can significantly improve the effect of underground mine emergency communication. It has a wide application and promotion of underground mine production, gas disasters such as gas fire dust roof often occur. The situation of mine safety production is severe, and the environment of the well is complicated. It is difficult for people in distress to maintain a normal mentality under pressure to communicate the accident. As a result, the victims in the rescue and rescue process can not accurately and quickly contact the underground ambulance personnel and rescue command centers at all levels, and effectively reflect the disaster and the situation. This has greatly affected the decision-making of disaster relief and rescue command, so it is imperative to strengthen the research on underground mine emergency communication.
How to accurately and efficiently put the emergency incident article number 03 and the backup rescue command center in the rescue area in the disaster area, it is of great significance to enhance the mine rescue decision-making ability to improve the level of the Beijing-Guangzhou sudden towel, 1 underground mine Emergency communication mine communication is responsible for tasks such as production command monitoring, monitoring and handling of accident rescue and disaster relief transmission information, especially in the event of a sudden emergency, which plays an important role in safeguarding personal safety and mine safety. With the improvement of mine automation, mine communication technology has also been greatly developed. Therefore, the influence of human factors on communication effects is becoming more and more prominent in the communication process.
3 The upper computer adopts the famous configuration software, and the interface is beautiful. The 1-bit machine and the site 1 greeted the 0 way for data exchange. Its main function real-time monitoring system real-time operating data parameters 2 real-time remote control through the corresponding standard operation. Complete the real-time remote control command; the real-time historical curve system generates the curve in real time to run the real-time point, provides real-time and historical event query and alarm for real-time historical events and alarms, runs the log and reports the running log to generate the daily report monthly report, and provides the query. Printing function, equipment management 14 printing corresponding set grain transport, state parameters, providing maintenance and repair function, 1 change reminder function 3 conclusion air compressor system based on the system of coal mine air compressor frequency conversion speed control system, several preparations have the following obvious advantages 1 In the system 34, the pressure of the wind-bag outlet is basically fixed, and the worst temperament is solved. In order to ensure the reliability of the wide-winding tool=2, the modified system improves the working efficiency and has remarkable energy-saving effect. The membrane has high control precision and operational stability, strong anti-interference ability and dynamic response. The degree of automation of the system is improved and the production efficiency is improved.
1 Wu Haiyan. , in the closed-loop control system, the implementation of the controller. 0. PIXFA2X6f8t48492 Hong Nai power and scorpion drag and twist system Yi Xiaozhen, Beijing Machinery Industry Press. 20063 Wu Tao. Air compressor station frequency conversion speed regulation microcomputer monitoring system 1 inverter llKf.
Shi. The main recognition of electrical automation control research.
Received date 200807, responsible editor Jin Lihua
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