基于堰流和筛分理论的自磨机格子板设计

Grating of self-grinding machine based on the theory of weir flow and screening

针对自磨机格子板排矿效率明显不足和格子板的寿命无法完全满足生产需求,导致矿石颗粒在自磨机筒体内大量集聚的问题,应用离散元法作为自磨机仿真研究的基础,通过以常用的矩形同心型和矩形辐射型格子板进行了对比,引入了堰流和筛分理论对格子板进行了设计,最终设计出了排矿效率较高、耐磨性较好的波形斜向型格子板。采用Archard wear磨损模型,定量分析了格子板的磨损情况,运用EDEM与ANSYS耦合的方法分析了格子板工作时的等效应力及其分布情况。研究结果表明:波形斜向型格子板提升条前端矿石滞留量更少,排矿量有了大幅提高,磨损量大幅减少;运行过程中应力集中大幅降低,具有更好的稳定性。

Aiming at the self-grinding grid plate exhaust efficiency is obviously insufficient and the life of the grid plate can not fully meet the production demand, which leads to the problem of large concentration of ore particles in the self-grinding barrel,the discrete element method was applied as the basis of the simulation of self-grinding machine, and compared the common rectangular concentric type grid plates with the rectangular radiation type grid plates. The weir flow and screening theory was introduced to design the grid plate. Finally, the waveform oblique grid type with high exhaust efficiency and good wear resistance was designed.The situation of lattice plate wear was quantitatively analyzed by the Archard wear wear model. The equivalent stress and its distribution of the grid plate were analyzed by the method of EDEM and ANSYS coupling. The results indicate that the ore retention of the front end of the waveform oblique grid plate lifting strip is less, the discharge amount is improved greatly, the wear amount is reduced greatly, and the stress concentration is reduced greatly during the operation, which has better stability.