基于EDEM的新型砂磨机主参数仿真及优化

Simulation and Optimization of Main Parameters of a New Grinder Based on EDEM

针对传统砂磨机在超硬、超微粉体的制备方面存在细化度低、能量强度弱及能量利用率不足等问题,提出用涡轮叶片代替搅拌轴以获得大能量变速液力流场,利用强力冲击产生的碰撞与振动力场实现超硬、超微粉体的粉碎细化,并研制出新型砂磨机样机.对新型砂磨机主参数填充率和涡轮叶片倾角进行优化,通过EDEM设计单参数及正交仿真试验,以磨介球速度作为评价指标,分析新型砂磨机最佳工作参数组合,并进行样机试验验证.试验结果显示,新型砂磨机相比传统砂磨机磨腔内能量强度提升明显,研磨时间明显缩短,出料细度均值由0.8μm提升至0.36μm,证明了试验结果和仿真的一致性.

In view of problems of low fineness,low energy intensity and insufficient energy utilization in preparation for ultra-hard ultra-fine powder in a traditional grinder,a new type of grinder prototype is proposed and developed.A turbine blade instead of mixing shaft is used to obtain high energy variable speed hydraulic flow field,and the impact and vibration force field generated by strong impact is used to realize the grinding and refinement of ultra-hard ultra-fine powder.On the basis of the above research and analysis,the filling rate of the main parameters and inclination of the turbine blade are optimized.Through the single parameter design of EDEM and the orthogonal simulation test,taking the speed of the grinding medium ball as evaluation index,the optimal working parameter combination of the new type of grinder is analyzed and prototype experiment is designed for verification.Experimental results of the prototype show that energy intensity in the grinding chamber of the new type of grinder is significantly improved compared with that of traditional grinder,grinding time is significantly shortened,and average fineness of discharge materials is increased from 0.8μm to 0.36μm,which proves the consistency between experimental results and simulation results.