The Mechanical Analysis And Experimental Study On The Impact Cutting Of Coal

In this paper,I will firstly discuss the cutting mechanism of cylinder coal cutters which are used widely now days and the development of theory on rock and coal cutting. Secondly ,I will introduce the physical and mechanical characters of coal,at the same time,I will give the picture of especial mechanics state of coal under the mine stress.Base on these,I will demonstrate that the impact coal cutting is a good way of coal cutting that make the best use of physical character of coal rock and especial mechanics state of coal under mine stress.What'more, I will analysis theorically when impact bit impact the coal which kinds of mechanics weaves will be gendered and what effect these weave can bring to the coal(including the reflectness of weave,the congregation of weave and the interaction between the weave and crevices.etc),point out the mechanical spaces which is brought by weaves are changing with the time and the position in the coal.From the data and the curve-fitting which depict the mechanical spaces varying with the distance to the point which the impact bit act on the coal,we can find that mechanical spaces,especially the maximum of pulling force spaces,existence a certain distance to the point which impact bit act on.While the position which is near to the point the impact bit act on have no the pulling force spaces.