分级破碎过程的断裂动力学分析和试验研究  

Fracture dynamics analysis and experimental study on graded crushing process

作　　者：周强[1] 潘永泰[1] 郭庆[1] 朱长勇 魏英华[2] 杨程[2] 沈宁[2] Zhou Qiang;Pan Yongtai;Guo Qing;Zhu Changyong;Wei Yinghua;Yang Cheng;Shen Ning(School of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China;Shenhua Ningxia Coal Industry Group Co.,Ltd.Taixi Coal Preparation Plant,Shizuishan Ningxia 753000,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]神华宁夏煤业集团有限责任公司太西选煤厂,宁夏石嘴山753000

出　　处：《矿业科学学报》2019年第5期461-467,共7页Journal of Mining Science and Technology

摘　　要：分级破碎机齿辊转速是控制破碎产品粒度的关键参数。目前,齿辊转速的确定处于定性阶段,还没有相应的理论指导。本文从Grady-Kipp动态断裂模型出发,分析了加载速率与试样粒度之间的关系,并通过落锤试验机对无烟煤和煤矸石两种物料在不同加载速率下进行重锤试验,发现两种物料碎块平均粒度随加载速率的增大按幂函数规律减小,为分级破碎机转速的确定提供了依据。The rotational speed of the toothed rolls crusher is a key parameter for controlling the particle size of the crushed product.At present,the determination of the rotational speed is in a qualitative stage.There is no corresponding theory to guide.Based on the Grady-Kipp dynamic fracture model,the relationship between loading speed and product particle size is analyzed.The anthracite and gangue crushed at different loading speeds was carried out by drop hammer test machine.The results show that the average size of the two materials decreases with the increase of loading speed with power law.The test results verify the correctness of the fracture model,and provide a reference for the determination of the loading speed of toothed rolls crusher.

关 键 词：分级破碎机 Grady-Kipp动态断裂模型 落锤试验机 加载速率 

分 类 号：TD452[矿业工程—矿山机电]