Influence of wind velocity on miners’ safe working limit time in high-humidity and high-temperature environment

• Published in: Mei kuang an quan Vol. 53; no. 4; pp. 253 - 256
• Main Authors: WANG Jianguo, GAI Jinmeng, WANG Jingwei
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Safety in Coal Mines 01.04.2022
• Subjects: cox regression analysis; humid and hot environment; physiological indicators; safe working limit time; wind velocity
• ISSN: 1003-496X
• DOI: 10.13347/j.cnki.mkaq.2022.04.039

In order to study the influence of wind velocity on the safe working limit time of miners in a humid and hot mine, five experienced mine workers were selected as subjects to exercise labor simulations with moderate intensity under 24 different mine environments simulated by an artificial microclimate room. While recording the experimental time, their physiological indicators were measured: heart rate and rectal temperature, therefore to determine safe working limit time of the miners. There are 4 groups of wind velocity are set: static wind(wind velocity less than 0.2 m/s), low velocity wind(1 m/s), medium velocity wind(2.5 m/s), high velocity wind(4 m/s), 3 groups of temperature are set: 26, 30, 34 ℃, 2 groups of relative humidity are set: 70%, 90%. According to the experimental data, the Cox regression method and survival function method are used to analyze the effect of wind velocity on the safe working limit time and the recommended value of safe working limit time is given. The result shows that: the inf