Abstract
When light alloys used in coal mine, the sparks generated by mechanical friction and impacts are the main effective ignition source. While the hot surfaces are concomitant in friction process, prior to the occurrence of mechanical sparks, whether the hot surfaces will be an effective ignition source. Then this paper focuses on the development of hot surfaces generated by TC4 titanium alloy at the low friction velocities. Experiments and finite element simulation methods were used together to describe the temperature field of TC4 titanium alloy. It was found that the temperature of hot surfaces increased with the load and increased much faster at higher relative speed. By means of regression analysis, the variation law of friction coefficient and contact pressure with loads and the variation law of hot surface temperature with friction coefficient and pressure were studied, then the fitting curve of hot surface temperature was obtained. The results of calculations and experiments indicate that hot surfaces generated by light alloy was possible to be an effective ignition source for methane air mixture in coal mine.
Highlights
For non-electrical equipment intended for use in coal mine, an ignition hazard must be assessed, which includes a consideration of all potential ignition sources.[1]
While for electrical equipments are always set in flameproof enclosures house which is made by steel to isolate them from explosive gas.[2]
The temperature of hot surfaces generated by TC4 titanium alloy increased with the load and increased much faster at higher relative speed
Summary
For non-electrical equipment intended for use in coal mine, an ignition hazard must be assessed, which includes a consideration of all potential ignition sources.[1]. Matlab software was used for regression analysis and significance test, and the fitting curves of friction coefficient and pressure under different loads were obtained with the rotational speed was 0.69 m /s. By means of regression analysis, the fitting equation of the temperature of hot surfaces changing with friction coefficient and contact pressure was obtained. The wear point, where there is no contact with the surrounding environment, and the heat transfer of the hot surface needs to rely on the thermal conductivity of the material. Further experiments are needed to see if the hot surface can ignite the methane-air mixture
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