基于刨煤机单刨刀截割试验的截割阻力模型研究

Study on cutting resistance model of single plow cutter test based on coal plough

根据刨煤机刨刀截割煤岩阻力谱以及截割机理,辨识出刨头破碎煤岩的所受截割阻力,提出了基于单刨刀截割阻力、刨刀截割规律及运行参数来确定刨头瞬时截割阻力方法,建立刨头截割阻力试验-理论综合模型,给出了截割阻力模型算法。结果表明:当煤岩阻抗为225 N/cm、崩落角为30°、刨刀数量为14把时,刨头上的刨削阻力达到最大96.86 k N,变差系数达到最小0.509 53,载荷波动较小,有利于刨头刨削煤体,理论分析与试验结果基本吻合,截割阻力的特征和量值均有很好的复合度,单刨刀截割试验可反映出煤岩破碎的内在规律。

According to the resistance spectrum of coal and rock cutting resistance spectrum with the cutters of the coal plough as well as the cutting mechanism,the cutting resistance of the plough head breaking the coal and rock was identified. Based on the cutting resistance of a single plough cutter,the cutting law of the plough cutter and operation parameters provided,the instantaneous cutting resistance method of the plough head was determined,the cutting resistance test and theoretical comprehensive model of the plough head was established and the algorithm of the cutting resistance model was provided. The results showed that when the impendence of the coal and rock was 225 N / cm,the caving angle was 30° and the number of the plough cutters was 14,the ploughing resistance of the plough head would reach96. 86 k N in max and the variation coefficient would be 0. 509 53 in min. A load fluctuation would be less and would be favorable for the plough head to plough the coal. The theoretical analysis and the test results were fitted basically. The cutting resistance features and value all would have a good composition and the test of single plough cutter could reflect the internal law of the coal and rock breaking.