The Influence of Simulated Particle Radius on Complex Coal Seam of Drum Cutting
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摘要: 为研究EDEM离散元软件在螺旋滚筒截割过程仿真时颗粒半径对滚筒载荷特性及落煤情况的影响，利用EDEM仿真软件模拟某型号采煤机滚筒截割复杂煤壁时的动态过程，得到截割过程中滚筒载荷、载荷波动及落煤情况，并与基于MATLAB开发的辅助计算程序所计算出的数值进行对比。结果表明：使用不同半径的离散颗粒进行仿真会对滚筒载荷及落煤情况产生影响，随着颗粒半径增大，滚筒载荷没有过大的变化，螺旋滚筒截落下的颗粒平均初始速度减小，载荷波动系数与装煤率增大。对比理论计算数值，使用半径为12 mm的颗粒建立煤壁，仿真结果更接近理论数值，准确性高，为EDEM离散元仿真软件模拟采煤机截割过程时颗粒半径的选择提供参考。Abstract: In order to study the effect of particle radius on the drum load characteristics and coal falling situation during the simulation of the spiral drum cutting process, the EDEM discrete element software was used to simulate the dynamic process of cutting a complex coal wall with a type of shearer drum, the load, load fluctuation and coal falling situation were obtained, and comparing with the value calculated by the auxiliary calculation program based on MATLAB. The results show that the use of discrete particles with different radius will have an impact on results of the drum load and coal falling situation. With the increase of the particle radius, there is no significant change in the drum load, and the average initial velocity of the particles under the cutting of the spiral drum is reduced, the load fluctuation coefficient and the coal loading rate are increased. Compared with the theoretical calculation, the simulation results are closer to the theoretical value and have high accuracy with the coal wall built with 12 mm radius particles. This study provides a reference for the selection of particle radius when EDEM discrete element simulation software is used to simulate the cutting process of shearer.
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Key words:
- discrete element method /
- shearer /
- load /
- fluctuation coefficient /
- coal loading rate /
- MATLAB /
- simulation /
- particle radius
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表 1 煤岩物理力学性能指标
材料名称 煤 石灰岩 弹性模量 2.01 18.3 密度/(kg·m-3) 1 280 2 610 泊松比υ 0.28 0.21 单向抗拉强度/MPa 0.3 5.24 内摩擦角/(°) 20.48 38.72 单项抗压强度/MPa 12 52 
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表 2 煤岩颗粒粘结接触参数
颗粒半径/mm 参数名称 煤与煤 煤与硬夹矸 硬夹矸与硬夹矸 8 法向刚度/(N·m-3) 9.659 0×107 1.727 1×108 8.505 0×108 切向刚度/(N·m-3) 7.656 0×107 1.398 5×108 6.803 0×108 法向最大应力/Pa 6.588 6×106 1.434 3×107 2.205 4×107 切向最大应力/Pa 1.870 9×106 5.755 1×106 1.001 7×107 12 法向刚度/(N·m-3) 1.216 5×108 2.184 2×108 1.067 8×109 切向刚度/(N·m-3) 9.732 0×107 1.747 3×108 8.542 5×108 法向最大应力/Pa 8.318 3×106 1.800 3×107 2.817 9×107 切向最大应力/Pa 2.357 3×106 7.400 4×106 1.259 2×107 16 法向刚度/(N·m-3) 1.467 1×108 2.641 3×108 1.285 1×109 切向刚度/(N·m-3) 1.180 8×108 2.096 1×108 1.028 2×109 法向最大应力/Pa 1.004 8×107 2.166 3×107 3.430 4×107 切向最大应力/Pa 2.843 7×106 9.045 7×106 1.516 5×107
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表 3 不同颗粒半径时的载荷计算结果
颗粒半径/mm 滚筒载荷 载荷均值/N 波动系数 8 76 262.4 0.294 9 12 76 422.6 0.337 4 16 75 918.5 0.382 1
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表 4 滚筒装煤仿真结果统计
颗粒半径/mm 煤岩颗粒数/个 装煤率/% 统计区Ⅰ 统计区Ⅱ 8 25 752 9 039 35.1 12 5 202 3 382 39.4 16 2 497 1 748 41.2
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表 5 MATLAB辅助计算需输入的主要参数
参数名称 数值 采煤机牵引速度/(m·min-1) 4.2 滚筒转速/(r·min-1) 91 圆柱段直径/mm 800 尾片与半个齿座距离和/mm 70 螺旋叶片外缘直径/mm 625 筒毂直径/mm 530 叶片螺旋升角/(°) 15 叶片厚度/mm 90 叶片头数 2 圆柱段每线齿数 2 叶片摩擦角/(°) 38.4 崩落角/(°) 70 煤的坚固性系数 1.3 岩石的坚固性系数 6.8
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