? New technology and new products? Air compressor group microcomputer monitoring system Yankuang Group Yangcun Coal Mine Feng Quanbin Yu Qinglin Yue Chaozhu Shandong Coal Research Institute Qi Tongfan Jiang Yuzhi Wang Encheng 1 Overview Air compressor is one of the important power equipment for coal mine production. However, most of the air compressors in China are generally controlled by general relays. The level of monitoring and protection is low, and the requirements for the operation of air compressors in the Coal Mine Safety Regulations cannot be met. Therefore, the failure rate is high, the maintenance amount is large, and the safe and efficient production of the mine cannot be effectively guaranteed. In recent years, although some mines have adopted air compressor automatic control and microcomputer control technology, due to the selected models or technical measures that cannot be adapted to the coal mine, especially the special production environment of the air compressor room, they will be lost soon after installation. It should have the effectiveness. Can not be used normally in coal mines. The "Air Compressor Group Microcomputer Monitoring System" with the programmable controller as the core developed by Yangcun Coal Mine of Yankuang Group Corporation and Shandong Coal Science Research Institute completely solved the problem of single-chip microcomputer or industrial control machine. The data test of the air compressor microcomputer monitoring system is inaccurate, the anti-interference ability of the whole machine is poor, and it cannot adapt to the problem of the on-site environmental conditions. With its good performance and accurate and stable data online monitoring, it has successfully realized the safety protection during the operation of the air compressor. After using the certificate, the system has reasonable software and hardware design, complete functions, good performance, high reliability, and convenient use by users. It plays an extremely important role in improving the automation level and management level of the air compressor operation. 2 Main functions and features 2.1 Main functions of the system: (1) Temperature monitoring and protection Real-time monitoring of the primary exhaust temperature, secondary exhaust temperature, air package temperature, lubricating oil during the operation of the air compressor according to needs Technical parameters such as temperature, cooling water temperature, motor stator temperature, etc., and can achieve over-limit sound, light alarm and equipment safety protection. (2) Pressure monitoring and protection According to the needs, real-time monitoring of the first-stage exhaust pressure, secondary exhaust pressure, wind pack pressure, lubricating oil pressure, cooling water pressure and other technical parameters during the operation of the air compressor, and can achieve over-limit Sound and light alarms and equipment security protection. (3) When the water cut instruction and the protection air compressor run out of water, the monitoring system can quickly alarm and protect the equipment. (4) Electrical parameter monitoring and protection can realize data monitoring and protection of working voltage, current and power factor during the operation of air compressor, and provide basis for production management. (5) Centralized control of the air compressor group The centralized control of the air compressor group (3, 4 or more) is completed by the programmable controller. 2.2 Its main performance characteristics (1) The host adopts imported original programmable controller, the whole machine is stable, reliable and strong in anti-interference ability. Its modular structure and easy-to-understand programming language make it easy to maintain on site. (2) Using high-precision temperature, pressure transmitter and sensor-specific digital display instruments, linear power supply for AD/DA module power supply, one-to-one shielded cable wiring and other technologies. (3) The system has centralized control, automatic parameter inspection (patrol interval is freely set by the user) and manual detection. It has the functions of operation indication, alarm indication, silence, reset and so on. (4) The hardware configuration of the whole machine is reasonable, the software is structured and designed, and the performance and price ratio are high. The panel is made of PVC technology and has a beautiful appearance. 3 system composition and working principle 3.1 system composition monitoring system is mainly composed of monitoring cabinet and system host SU6B programmable controller, noise filter, linear power supply, OMRON relay, sensor-specific digital display instrument and installed in each measuring point Temperature sensor, pressure sensor, RVVP cable and so on. Shandong Coal Science and Technology 3. 2 working principle by the temperature transmitter, pressure transmitter, water shut-off device to collect the real-time signal, sent to the relevant modules of the programmable controller, processed by the CPU, real-time monitoring by the sensor-specific digital display instrument Display the working status and parameter values ​​of the device. Its system block diagram is shown in Figure 1. 4 Working parameter setting According to the relevant provisions of the “Safety Regulations for Coal Mines†and the needs of users, the main working parameters of the air compressor monitoring system of the air compressor are set to meet the over-limit (upper and lower limit) alarms and shutdowns to achieve safety protection. the goal of. 5 PLC hardware design According to the requirements of air compressor monitoring system and the future expansion of the system, SU6B type programmable controller is selected, and a U08B base frame, two 16-point switch input modules and four 8 channels are configured. Analog input module, two 16-point switch output modules, two 4-channel analog output modules. 6 system software design software design is reasonable and correct is the prerequisite for PLC control. The software design of this system adopts modular structure and ladder language programming. The program memory is the anti-interference measure of the E 7 system. The monitoring system uses the SU6B programmable controller as the monitoring system host. It has a strong anti-interference ability. According to the working conditions of the air compressor, measures are taken to further improve the accuracy and reliability of the monitoring system. (1) Install a noise filter in the power supply line of the SU5E. (2) The temperature transmitter and pressure transmitter signals are transmitted by the two-wire standard current signal. (3) Directly send the transmitter output signal to the PLC/AD module using a one-to-one shielded cable. (4) The sensor-specific digital display instrument is used. Its input signal is a standard current signal of 4 to 20 mA. (5) The AD and DA modules are powered by standard linear power supply (switching power supply is not recommended) to further improve the stability and reliability of the whole system. (6) The corresponding countermeasures have also been taken in the design of the system software. 8 Industrial test situation After the simulation test, the system was tested in Yangcun Coal Mine in early July 1999. In the course of nearly one year of continuous operation, the system has fully demonstrated its excellent technical performance. (1) The operating parameters of the air compressor monitored are accurate, intuitive and clear at a glance. (2) The working mode of the system is reasonable. There are automatic inspection and manual detection. And the discrete components are few, the host structure is simple, and the maintenance is convenient. (3) The system host works stably and reliably. Especially in the case that the high-power motor starts running and the motor excitation control cabinet is close at hand, the system shows its unique anti-interference ability. This is not available in the original control system based on single-chip microcomputer. (4) During the system test period, the hot summer season is hot, and the ambient temperature of the air compressor room is often higher than 40 °C. However, the system operation is always stable, showing its strong environmental adaptability. The test shows that the main components selected by the system, such as sensors, digital display instruments, etc., have reasonable technical parameters and reliable quality, which can fully meet the air compressor. The need for monitoring. Therefore, it can be said that the system is currently an ideal air compressor monitoring device. Shandong Coal Technology Investment Casting Lost Wax Casting
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October 17, 2024