The effect of geometries and cutting parameters of conical pick on the characteristics of dust generation: Experimental investigation and theoretical exploration

Abstract

Understanding the characteristics of dust generation is the basis of effective dust control. To reveal the influence of pick geometries and cutting parameters on the characteristics of dust generation during roadheader cutting, this paper conducted an experimental investigation and theoretical exploration on the effects of tip angle, attack angle and cutting speed on the cumulative proportion of small size dust and the mass rate of dust generation. It was found that tip angle and attack angle considerably affected dust generation, whereas the effect of cutting speed could be ignored. The positive relationships between tip angle and both cumulative proportion and mass rate of dust generation were observed. A larger attack angle can reduce dust generation. The change of the cutting force and the size of the damaged zone are the fundamental reasons for the difference of dust generation under varying conditions. In general, the cutting process with a smaller tip angle of pick and a larger attack angle appears beneficial to abate dust generation. This study would enhance the fundamental understanding of coal dust generation, which will provide guidance for selecting suitable pick geometries and cutting parameters to ameliorate environment quality and obtain a cleaner production environment.