Design Of Wireless Terminal For Coal Mining Machinery Self-powered Monitoring System

Coal is one of the main energy for human survival, the mechanization level of coal impact the production efficiency and economic benefits of coal directiy. The coal mining machinery, especially spinners machinery and equipment, vulnerable to the huge impact from coal, rock and so on.Then leading mining machinery bearing, hydraulic systems and mechanical systems fails, and the failure usually reflected in abnormal changes in temperature and vibration conditions, so it’s necessary to monitor the coal temperature and vibration conditions when working. The traditional wired methods of measurement due to line wrapping, maintenance costs and other issues can not be widely implemented.Wireless sensor networks(WSN) technology can solve this problem. However, a large number of sensor nodes are provided electricity by batteries in a WSN.The battery occupies most of the size and weight of the entire node, and it is a huge cost of replacing or charging battery.Therefore, design a terminal device that with self-powered and wireless sensor function has great economic value and practical value.The purpose of this subject is real-time monitoring the coal mining machinery online status.On the basis of researsh the requirements of mining machinery condition monitoring system.Completed the terminal prototype design of this monitoring system. Where core control unit used ultra-low powered 16-bit microcontroller MSP430F5438;Energy management module used LTC3331 chip to manage the harvested vibration energy;Battery testing module used MAX17043 chip real-time monitoring the battery power; Temperature monitoring module used digital temperature sensor DS18B20, measurement accuracy up to ±0.5℃ in the range of-20℃~80℃; Vibration monitoring module used digital accelerometer ADXL345,the maximum sampling rate up to 3.2KHz;Wireless transmission module used RF chip CC2530 combined with PCB antenna complete low-power, short distance wireless transmission of information. Then completed the writing and debugging of this system software by IAR Embedded Workbench platform. Finally, proved the terminal prototype is running well by experimental verification, and the overall power consumption less than 52 mA, can guarantee the effective transmission of dates in the range of 10 meters. Realized the goal of low power, small size and easy to install.