分级破碎过程的断裂动力学分析和试验研究
|
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.
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.
引文
[1] 王介强.矿岩料层动态粉碎的实验研究[D].沈阳:东北大学,1999.
[2] 武宇,刘殿书,吴帅峰,等.砂岩冲击损伤与应力波参数关系试验研究[J].矿业科学学报,2018,3(3):229-237.Wu Yu,Liu Dianshu,Wu Shuaifeng,et al.Experimental study on relationship between impact damage of sandstone and stress wave parameters.Journal of Mining Science and Technology,2018,3(3):229-237.
[3] 易洪昇,徐松林,单俊芳,等.不同加载速度下脆性颗粒的破坏特性[J].爆炸与冲击,2017,37(5):913-922.Yi Hongsheng,Xu Songlin,Shan Junfang,et al.Failure characteristics of brittle particles under different loading velocities [J].Explosion and Impact,2017,37 (5):913-922.
[4] 江红祥,刘送永,杜长龙.冲击速度对煤岩破碎能量和粒度分布的影响[J].煤炭学报,2013,38(4):604-609.Jiang Hongxiang,Liu Songyong,Du Changlong.Impact velocity's influence on energy and particle size distribution of coal and rock fragmentation [J].Journal of China Coal Society,2013,38 (4):604-609.
[5] Grady D E,Kipp M E.Continuum modelling of explosive fracture in oil shale[J].International Journal of Rock Mechanics & Mining Sciences & Geomechanics Abstracts,1980,17(3):147-157.
[6] Lankford J,Blanchard C R.Fragmentation of brittle materials at high rates of loading[J].Journal of Materials Science,1991,26(11):3067-3072.
[7] Francois H,Denoual C,Forquin P,et al.On the probabilistic-deterministic transition involved in a fragmentation process of brittle materials[J].Computers & Structures,2003,81(12):1241-1253.
[8] Zhou F,Molinari J F.Stochastic fracture of ceramics under dynamic tensile loading[J].International Journal of Solids and Structures,2004,41(22/23):6573-6596.
[9] Heng R,Cheng K,Tuppurainen D,et al.Mechanistic modelling of mineral sizers[J].Minerals Engineering,2003,16(9):807-813.
[10] 张明波.基于离散元方法的双齿辊破碎机破碎过程仿真研究[D].长春:吉林大学,2015.
[11] 刘煜,郑群飞.基于离散元素法的双齿辊破碎机影响因素研究[J].矿业科学学报,2018,3(4):364-370.Liu Yu,Zheng Qunfei.Study on the influence factors of the double-geared roller crusher based on the discrete element method[J].Journal of Mining Science and Technology,2018,3(4):364-370.
[12] 孙福兴.原煤分级破碎机[J].水力采煤与管道运输,2000(4):7-11.Sun Fuxing.Raw coal classification crusher[J].Hydraulic Mining and Pipeline Transportation,2000(4):7-11.
[13] 王进军,穆晓梅.分级破碎机的设计研究[J].煤矿机械,2006,27(11):7-8.Wang Jinjun,Mu Xiaomei.Design and research of graded crusher[J].Coal Mine Machinery,2006,27(11):7-8.
[14] 潘永泰,张新民.分级破碎机的研究及应用[J].矿山机械,2002(4):13-15.Pan Yongtai,Zhang Xinmin.Research and application of graded crusher[J].Mining Machinery,2002(4):13-15.
[15] 潘永泰,王保强.分级破碎机转速的断裂动力学分析[J].选煤技术,2003(6):79-81.Pan Yongtai,Wang Baoqiang.Fracture dynamics analysis of the speed of graded crusher[J].Coal Preparation Technology,2003(6):79-81.
[16] 阿特金森 D K.岩石断裂力学[M].北京:地震出版社,1992.
[17] Grady D E,Kipp M E.The micromechanics of impact fracture of rock [J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1979,16(5):293-302.
[18] Davison L,Stevens A L.Thermomechanical constitution of spalling bodies[J].Journal of Applied Physics,1973,44(2):668-674.
[19] Walsh J B.The effect of cracks on the compressibility of rock[J].Journal of Geophysical Research,1965,70(2):381-389.
[20] Jaeger J C,Cook N G.Fundamentals of rock mechanics.third edition[J].Science Paperbacks,1979,9(3):251-252.
[21] Shockey D A,Curran D R,Seaman L,et al.Fragmentation of rock under dynamic loads[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1974,11(8):303-317.
[2] 武宇,刘殿书,吴帅峰,等.砂岩冲击损伤与应力波参数关系试验研究[J].矿业科学学报,2018,3(3):229-237.Wu Yu,Liu Dianshu,Wu Shuaifeng,et al.Experimental study on relationship between impact damage of sandstone and stress wave parameters.Journal of Mining Science and Technology,2018,3(3):229-237.
[3] 易洪昇,徐松林,单俊芳,等.不同加载速度下脆性颗粒的破坏特性[J].爆炸与冲击,2017,37(5):913-922.Yi Hongsheng,Xu Songlin,Shan Junfang,et al.Failure characteristics of brittle particles under different loading velocities [J].Explosion and Impact,2017,37 (5):913-922.
[4] 江红祥,刘送永,杜长龙.冲击速度对煤岩破碎能量和粒度分布的影响[J].煤炭学报,2013,38(4):604-609.Jiang Hongxiang,Liu Songyong,Du Changlong.Impact velocity's influence on energy and particle size distribution of coal and rock fragmentation [J].Journal of China Coal Society,2013,38 (4):604-609.
[5] Grady D E,Kipp M E.Continuum modelling of explosive fracture in oil shale[J].International Journal of Rock Mechanics & Mining Sciences & Geomechanics Abstracts,1980,17(3):147-157.
[6] Lankford J,Blanchard C R.Fragmentation of brittle materials at high rates of loading[J].Journal of Materials Science,1991,26(11):3067-3072.
[7] Francois H,Denoual C,Forquin P,et al.On the probabilistic-deterministic transition involved in a fragmentation process of brittle materials[J].Computers & Structures,2003,81(12):1241-1253.
[8] Zhou F,Molinari J F.Stochastic fracture of ceramics under dynamic tensile loading[J].International Journal of Solids and Structures,2004,41(22/23):6573-6596.
[9] Heng R,Cheng K,Tuppurainen D,et al.Mechanistic modelling of mineral sizers[J].Minerals Engineering,2003,16(9):807-813.
[10] 张明波.基于离散元方法的双齿辊破碎机破碎过程仿真研究[D].长春:吉林大学,2015.
[11] 刘煜,郑群飞.基于离散元素法的双齿辊破碎机影响因素研究[J].矿业科学学报,2018,3(4):364-370.Liu Yu,Zheng Qunfei.Study on the influence factors of the double-geared roller crusher based on the discrete element method[J].Journal of Mining Science and Technology,2018,3(4):364-370.
[12] 孙福兴.原煤分级破碎机[J].水力采煤与管道运输,2000(4):7-11.Sun Fuxing.Raw coal classification crusher[J].Hydraulic Mining and Pipeline Transportation,2000(4):7-11.
[13] 王进军,穆晓梅.分级破碎机的设计研究[J].煤矿机械,2006,27(11):7-8.Wang Jinjun,Mu Xiaomei.Design and research of graded crusher[J].Coal Mine Machinery,2006,27(11):7-8.
[14] 潘永泰,张新民.分级破碎机的研究及应用[J].矿山机械,2002(4):13-15.Pan Yongtai,Zhang Xinmin.Research and application of graded crusher[J].Mining Machinery,2002(4):13-15.
[15] 潘永泰,王保强.分级破碎机转速的断裂动力学分析[J].选煤技术,2003(6):79-81.Pan Yongtai,Wang Baoqiang.Fracture dynamics analysis of the speed of graded crusher[J].Coal Preparation Technology,2003(6):79-81.
[16] 阿特金森 D K.岩石断裂力学[M].北京:地震出版社,1992.
[17] Grady D E,Kipp M E.The micromechanics of impact fracture of rock [J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1979,16(5):293-302.
[18] Davison L,Stevens A L.Thermomechanical constitution of spalling bodies[J].Journal of Applied Physics,1973,44(2):668-674.
[19] Walsh J B.The effect of cracks on the compressibility of rock[J].Journal of Geophysical Research,1965,70(2):381-389.
[20] Jaeger J C,Cook N G.Fundamentals of rock mechanics.third edition[J].Science Paperbacks,1979,9(3):251-252.
[21] Shockey D A,Curran D R,Seaman L,et al.Fragmentation of rock under dynamic loads[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,1974,11(8):303-317.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |