Performance analysis and experimental investigation of coal plow based on discrete element method

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 261-268.

TIAN Zhen1,2, JING Shuangxi2, ZHAO Lijuan3, ZHANG Jianjun4, GAO Shan1

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Abstract

In order to study the cutting performance of the coal plow,the properties of coal samples were determined by taking the BH38 / 2 × 400 type coal plow as the research object.The intrinsic parameters of coal wall material were determined and the three-dimensional bond contact model of coal wall was constructed.The force information of coal plow, the motion distribution of coal particles and the residual state of coal wall surface were obtained through the numerical simulation.The variation law of cutting force of the plow bit under different cutting depth and cutting speed was analyzed.The results show that:the linear accumulation of the force exerted on the plow bit makes the plow head’s cutting resistance and extrusion force greater,and the force of the plow head obeys Gauss distribution.The excessive cutting depth in the cutting process leads to a sharp increase in energy accumulation and release,while the change of cutting speed has little influence on the force of plow bit.The stress on the installation position of alloy head and back of plow bit body is more severe,and the position of the alloy head on the front side of the planer is seriously deformed.Through the cutting test of the plow under different conditions, the maximum errors between the experimental and the simulation results are respectively 7.21%, 7.91% and 9.41%.By tracing the working state of plow bit, it is found that the damage form of plow bit is consistent with the simulation results, which verifies the accuracy of discrete element numerical simulation.The results provide a new method for the cutting performance evaluation and structure optimization of coal plow.

Key words

discrete element method / contact model / coal plow / plow bit / cutting performance

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TIAN Zhen1,2, JING Shuangxi2, ZHAO Lijuan3, ZHANG Jianjun4, GAO Shan1. Performance analysis and experimental investigation of coal plow based on discrete element method[J]. Journal of Vibration and Shock, 2020, 39(10): 261-268

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