Study On Upper Limb Muscle Fatigue And Accident Prevention Of Miners Based On Surface Electromyography

China is a big country in coal production and consumption.The high demand and special coal mine environment make the miners’ work intensity and difficulty very large.It is more likely to cause physical fatigue and work errors of miners than other industries,which leads to higher accident rate in China’s coal industry.According to relevant statistics,more than 90% of coal mine accidents in China are caused by human insecurity.Therefore,studying the unsafe state of coal mines is conducive to reducing the incidence of coal mine accidents and improving the production efficiency of coal mine operations,which is of great significance to the safe production of coal mine enterprises.Select the upper limbs of the miners in the coal mine operation,find the cause of the muscle fatigue of the miners through the questionnaire,use the surface electromyography method to find the fatigue state of the upper limbs muscles,and conduct a preliminary study on the relationship between the upper limb muscle fatigue and the safety state of the miners.Relevant early warning mechanisms and prevention and control measures.Firstly,the risk causes and research status of human upper limb muscle fatigue are summarized and analyzed.The formation process and characteristics of upper limb muscle fatigue are analyzed through the principle of surface electromyography.Aiming at the coal mine operation,the process and specificity of the muscle fatigue of the miners in the coal mine environment are proposed.The surface EMG signal law is analyzed,and the relationship between the upper limb muscle fatigue and the unsafe state is found.Secondly,according to the actual work design questionnaire of the miners’ coal mines,the electronic and paper questionnaires were distributed to more than ten coal mines and two coal mines were visited in the field to listen to the actual situation of miners’ muscle fatigue.According to the results of the questionnaire,the body parts of the miners who often have pain or discomfort during work,working hours,working environment and other fatigue factors are obtained.The conclusions of the questionnaire provide a reference for subsequent simulation experiments and also reflect the importance of preventing miners’ muscle fatigue.Thirdly,a surface EMG signal system consisting of a body composition analyzer(InBody520)and a sports electromyography analyzer(Biovision EMG)was constructed to find out the regularity of the development process of upper limb muscle fatigue.Ten testers were selected to simulate the operation of miners’ coal mines,and the temperature,humidity,light and noise of different weight loads and simulated environment were observed as variables.The tester’s upper limb muscle fatigue changes and the relationship between muscle fatigue and safety status is obtained.At the same time,the tester’s upper limb flexibility was tested after each set of tests,and the degree of misoperation under different conditions was obtained.Finally,according to the surface EMG signal value of the tester during the fatigue process,the relationship between the surface myoelectric median frequency and time is obtained by regression analysis model,and the characteristics of the upper limb muscle fatigue development process are determined.On this basis,combined with the questionnaire and field visit results,the early warning mechanism and prevention and control measures for miners’ muscle fatigue in coal mine operations are proposed,including reasonable arrangement of miners’ working hours and provision of suitable working environment to ensure the miners’ work.Safety,prevention of coal mine accidents caused by people’s unsafe conditions.