Load Characteristics of Pick Cutting Coal Seams with Coal and Rock Interface

摘要

A series of experiments of a pick cutting coal seam in different forms were conducted on a cutting testbed of coal and rock. Rotational speeds of the pick and initial velocities of the coal seam in the experiments are uniformly set to be 60 r/min and 0.6 m/min, respectively. Based on the amplitude domain analysis of the cutting force-time signals of the pick cutting rock with different Compressive Strength (CS), it is found that force increment between the pick cutting rock and uniform coal seam linearly increases with the increase of CS difference between fault and coal, and the larger the CS is, the larger the load fluctuation is. Amplitude domain analysis of the signals of the pick cutting coal seam with coal and rock interface at different locations shows that the force increment of the pick cutting the coal seam with coal-rock interface at the center of the coal seam is the largest, compared with those of the pick cutting the coal seam with coal-rock interface at the top and at the bottom, but smaller than the sum of them.