基于EDEM的双齿辊破碎机破碎效率影响因素仿真分析

运用离散元软件EDEM对MMD1000系列双齿辊破碎机破碎效率进行仿真研究,考察物料性质、物料粒度分布、齿辊转速等变量对破碎机破碎效率的影响规律。结果表明,物料大块率的增加将降低破碎机的破碎效率;物料硬度的变化会引起破碎机破碎后物料出料粒度尺寸存在差异,即硬度越大的物料,破碎后Bonding键断裂数目越少,破碎机破碎效率越低;适当提高双齿辊破碎机齿辊转速能在一定程度上增大破碎机破碎效率,破碎机破碎软岩物料时提高齿辊转速较破碎硬岩物料时提高齿辊转速破碎机破碎效率提高幅度高。齿辊转速的变化还会造成破碎后物料的粒度发生改变:低齿辊转速下会使破碎机破碎后物料粒度分布较为均匀,强制排出大块较少;而高齿辊转速易造成强制排出大块物料,物料粒度分布不均。试验结果可以为提高双齿辊破碎机生产效能和破碎机的选型设计提供参考。

Simulation Analysis of Influencing Factors of Double-Geared Roller Crusher Crushing Efficiency Based on EDEM

Crushing efficiency simulation study on MMD1000 series Double-Geared Roller Crusher was conducted by discrete element software EDEM.Effects of material properties,material particle size distribution and gear roller speed on crushing efficiency were investigated.Results show that,increase of material bulk ratio will reduce crushing efficiency of crusher.Material hardness variation will bring about the difference of material size after crushing,that is,the harder is the material,the breaking number of Bonding bonds is smaller and the crushing efficiency of the crusher is lower；Properly increasing gear roller speed of Double-Geared Roller Crusher could increase crushing efficiency of the crusher in a certain extent.Meanwhile,compared with dealing with the hard rock material,the efficiency of the Double-Geared Roller Crusher dealing with-soft rock material is much higher than dealing with hard rock material.Change of the gear roller speed will also cause granularity difference of the material after crushing:low speed of the gear roller will make the particle size of the crusher broken to distribute more evenly and the forced discharge large blocks less.While,high gear speed can easily forced bulk materials discharged,distribution of material size is uneven.Test results can provide reference for production efficiency increase of Double-Geard Raller Crusher as well as model selection.