【摘要】 为了明确筛分过程中含团聚物潮湿细粒煤物料群与弛张筛板间的耦合振动规律，首先，通过理论计算推导了单团聚物或物料颗粒与振动筛板碰撞的抛射速度及最大冲击力表达式；其次，构建了含团聚物潮湿细粒煤物料群-非线性弛张筛板的筛分过程联合仿真模型，并通过试验对其有效性进行了验证；最后，采用联合仿真模拟分析了振动参数对物料群与筛板间耦合动力学特性的影响。结果表明：单团聚物或物料颗粒抛射速度及最大冲击力由弛张筛板恢复系数、安装倾角、振动幅值、振动频率及振动角等参数共同决定；稳定筛分过程中，含团聚物潮湿细粒煤物料群非线性时变激励使弛张筛板产生拍振，物料群平均法向速度随筛板振动幅值及振动频率的增大而增大；适当增大筛板振动频率可提高物料群的筛分效率和生产率。研究结果为弛张筛筛分性能的优化及最优工作g值的确定提供了参考。更多还原

【Abstract】 The work aims to clarify coupling vibration mechanism between flip-flow screen panels and moist fine coal material group containing agglomerates. Firstly,the ejection velocity and the maximum impact force of the single agglomerate or material particle colliding with the screen panel are derived through theoretical calculations. Then,the screening process co-simulation model of the moist fine coal material group containing agglomerates on nonlinear screen panels is constructed,and the effectiveness of which is verified by an experiment. Finally,the influence of vibration parameters on the coupling dynamic characteristics between material group and screen panels are analyzed by co-simulations. Results show that the ejection velocity and the maximum impact force of the single agglomerate or material particle are jointly decided by factors including the restitution coefficient,the installation inclination angle,the vibration amplitude,the vibration frequency,and the vibration angle. During the stable screening process,the beat vibrations of screen panels are caused by the nonlinear timevarying excitation of the material group,and particles average normal velocities are directly related to the vibration frequency and amplitude of the screen panels. The screening efficiency and production ratio of the material group can be properly improved by increasing the vibration frequency of screen panels. The research provides a reference for the screening performance improvement and the optimal working g value determination of the flipflow screen.更多还原