Flip-flow screen has unique advantages in dry deep screening of sticky and wet fine minerals. However, during the flip-flow screening process, the continuous collision of mineral materials causes the actual motion state of the screen plate to differ significantly from the ideal state. Clarifying the actual motion changes and stress characteristics of the flip-flow screen plate under the combined action of its own relaxation and tension motions and particle swarm collision is the basis for optimizing the structure of the flip-flow screen plate and the prerequisite for improving screening efficiency. Therefore, this study constructed a coupling simulation calculation model for the flip-flow screening system and explored the kinematic changes and stress distribution characteristics of the flip-flow screen plate under continuous impact of particle swarm. Furthermore, the influence of particle mass flow rate on the displacement and impact stress of the flip-flow screen plate was elucidated. Regarding the mesh structure, the stress changes of various parts of the mesh were revealed, and an optimization plan for the mesh structure was proposed through comparative experiments. Finally, the 1 mm dry screening experiment of fine coal was conducted on a semi-industrial flip-flow screen to verify the screening effect of the optimized screen plate. The results showed that when the processing capacity was 4.5 t/(h·m) and the screen plate length was 1.8 m, the screening efficiency could reach 81.73 %, which is about 15 % higher than before the optimizing the screen plate.

中文翻译：

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基于DEM-FEM耦合模型的翻转流筛板优化及细粒矿物筛分性能

翻转流筛在粘性和湿性细粒矿物的干式深筛方面具有独特的优势。然而，在翻转流筛分过程中，矿物材料的不断碰撞导致筛板的实际运动状态与理想状态存在较大差异。明确翻流筛板在自身松弛、张力运动和粒子群碰撞共同作用下的实际运动变化和受力特征，是优化翻流筛板结构的基础，也是提高筛分效果的前提效率。因此，本研究构建了翻转流筛分系统的耦合仿真计算模型，探讨了粒子群连续冲击下翻转流筛板的运动变化和应力分布特征。此外，还阐明了颗粒质量流量对翻转流筛板位移和冲击应力的影响。针对网格结构，揭示了网格各部分的应力变化，并通过对比实验提出了网格结构的优化方案。最后在半工业翻转流筛上进行粉煤1 mm干式筛分实验，验证优化后筛板的筛分效果。结果表明，当处理量为4.5 t/(h·m)、筛板长度为1.8 m时，筛分效率可达81.73 %，比筛板优化前提高约15 %。