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实验采用冲击式捣碎法,通过阶梯式增加冲击次数对不同煤样进行多次冲击破碎,再用标准筛分方法对破碎后煤样进行筛分并称重。在大量实验基础上,建立破碎煤粒度分布函数,探讨了煤的破碎功表面学说在多次冲击试验条件下的符合性,总结突出煤样多次冲击作用下的粒度分布规律。结果表明,破碎煤粒度分布函数和实验数据拟合性较好;当冲击次数较小时,煤的破碎功符合表面学说;在多次冲击作用下破碎煤样粒度不会随冲击次数增加而不断减小,而是集中在某一数值范围内,该粒度范围随煤样不同显示出特征性差异。
Experiments using impact mashed method, by increasing the impact of the number of steps to different coal samples were repeated impact crushing, and then using standard sieve method for crushing coal samples were weighed and weighed. On the basis of a large number of experiments, the particle size distribution function of crushed coal was established. The consistency of crushing work theory of coal under multiple impact test conditions was discussed. The law of particle size distribution under the multiple impact of coal sample was summarized. The results show that the particle size distribution function of the pulverized coal and the experimental data have good fitting properties. When the impact times are small, the crushing work of coal conforms to the surface theory. The particle size of the pulverized coal does not decrease with the increase of the number of impacts under multiple impacts Small, but concentrated in a range of values, the particle size range with the coal showed different characteristics of the difference.