Abstract
Shearer is an indispensable and important equipment for coal mining and the mining efficiency of shearer depends on the performance of pick to a great extent. In this paper, we conducted a series experiments of single pick cutting on the coal and rock cutting testbed. Simultaneously, we built the single pick cutting coal seam model, based on which, considering the strength condition of coal seam and coal–rock interface, the rotary cutting mechanical model of pick cutting coal seam with coal–rock interface is established. According to the crushing theory of coal and rock interface, this paper analyzed stress strain and strength condition of the area surround the interface, which ensured the basics for the further research. The data of picking force in the cutting process under different experimental conditions was collected by the sensor installed on the drum, a phenomenon appeared in the amplitude domain analysis of the data that the bigger force arising along with the greater compressive strength difference between coal seam and coal–rock interface, which means the force is positively correlated with the compressive strength. The results of time domain analysis shown that some basic properties of the cutting load changes over times.
Highlights
Shearer is an important part of the comprehensive mechanized coal mining
According to the analysis on the ampulitude domain, the phenomenon that force increment between the pick cutting rock and uniform coal seam linearly increases with the increase of compressive strength difference between coal seam and coal-rock interface, and the load fluctuation keep a positive correlation with the compressive strength
Research on dynamic characteristics of drum shearer cutting coal seam with coal-rock interface was proposed, and the existent problems of present researches were analyzed based on two project requirements described in the shearer engineering background and combined with the related technology of drum shearer Based on the maximum tensile stress theroy, Evans established the first predicted model of the peak cutting force of conical pick. [1], Roxborough et al [2] and Goktan [3] had modified the Evans mathematical model appropriately
Summary
Shearer is an important part of the comprehensive mechanized coal mining. Research on dynamic characteristics of drum shearer cutting coal seam with coal-rock interface was proposed, and the existent problems of present researches were analyzed based on two project requirements described in the shearer engineering background and combined with the related technology of drum shearer Based on the maximum tensile stress theroy, Evans established the first predicted model of the peak cutting force of conical pick. [1], Roxborough et al [2] and Goktan [3] had modified the Evans mathematical model appropriately. Liu et al [22,23,24] studied on the coal cutting test-bed, using the embedded wireless testing system for related to study the influence on cutting load of cutting material parameters and the pick parameters. It can provide theoretical basis for design the better pick cutting performance type cutting pick. Each layer of coal and rock parameter of elastic modulus, poisson ratio, shear modulus and ultimate strength is generally not the same, regardless of the width of the rock interface condensate
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