Research On Safety Alarm System For Coal Mining Machine Frequency Converter

In this paper,we study aging and frequent faults problems caused by heat generation and vibration of shearer frequency converter during the process of underground mining.We design a set of warning system based on coal machine frequency converter integrated security and protection according to the technologies of sensor signal acquisition,telecommunication and embedded application.It aims to improve the service life of the shearer frequency converter and provide a safe and effective early warning scheme for the of the converter in the process of coal mining.The early warning system mainly includes three parts:real-time data acquisition,remote data communication and PC monitoring center.As for the aspect of hardware design,the embedded STC15W4K58S4 micro controller is used as the control core to realize the real-time acquisition and dispose of the multiple channel temperature and vibration parameters.The system communication module uses the RS-485 industrial application bus to ensure the effective transmission of the data and realizes the remote communication of the underground monitoring.The PC Monitoring Center for coal mine uses embedded configuration touch screen to achieve the dynamic display of data recording and storage,it can effectively record historical data such as temperature rise and vibration parameters during the working process of the shearer and provide theoretical basis for the later fault diagnosis.As for software processing,the software of signal acquisition and A/D conversion is completed.At the same time,the interface design of the touch screen configuration software is realized by using the Modbus standard protocol,and also the function of alarm.The system also put forward an improved multiple summation design thought of temperature data acquisition,seeking the vibration energy information of discrete points through the method of mean-standard deviation to further ensure the safety and effectiveness of system data.At the end of this paper,a preliminary experiment is carried out to verify the frequency converter integrated security protection system.It turns out that the system can effectively achieve the purpose of early warning of comprehensive safety protection in the working process of converter,it has stable and reliable performance,and strong anti-interference ability,which means we have achieved the expected design objectives.