为了响应黄河流域生态保护和高质量发展的战略部署, 解决黄河下游河砂混合物的分离问题, 提高利用直线振动筛进行河砂分离的筛分效率, 查阅大量文献表明, 在直线振动筛的筛分过程中, 影响筛分效率及筛分质量的主要因素有: 振动频率、振幅和筛面倾角。因此, 本文以砂粒作为研究对象, 基于离散单元法 (EDEM) 对砂粒在直线振动筛不同参数下的筛分过程进行模拟, 使用Hertz-Mindlin with JKR接触模型, 通过改变振动频率、振幅、筛面倾角的参数, 观察其对筛分性能的影响及物料筛分过程的变化, 以砂粒的筛分效率作为衡量标准, 获得了最优筛分性能的振动参数组。通过分析仿真模拟结果发现, 直线振动筛的最优振动参数组为: 振动频率f=25Hz、振幅A=4mm、筛面倾角φ=4°, 此时筛分效率可以达到95. 77%。本研究结果表明利用离散元法对于不同工艺参数产生的筛分效率具有很好的可靠性, 该研究可为振动筛的参数选择提供相应的参考。

In order to respond to the strategic deployment of ecological protection and high-quality development of the Yellow River Basin, to solve the problem of separating river sand mixtures in the lower reaches of the Yellow River, and to improve the screening efficiency of river sand separation by linear vibrating screen, a large amount of literature is consulted, which show that the main factors affecting the screening efficiency and the screening quality during the screening process of linear vibrating screen are: the vibration frequency, the amplitude, and the inclination angle of the screen surface. Therefore, this paper takes sand as the research object, simulates the screening process of sand under different parameters in linear vibrating screen based on the discrete unit method (EDEM) , uses Hertz-Mindlin with JKR contact model, by changing the parameters of vibration frequency, amplitude, screen surface inclination angle, observes its impact on the screening performance and changes in the screening process of the material, and obtains the optimal screening efficiency with the screening efficiency of sand as a measure. As a measure, the vibration parameter set of optimal screening performance was obtained. Through analyzing the simulation results, it is found that the optimal vibration parameters of linear vibrating screen are: vibration frequency f =25Hz, amplitude A =4mm, screen surface inclination angle φ=4°, and the screening efficiency can reach 95. 77%. The results of this study show that the discrete element method has a good reliability for different process parameters to produce screening efficiency, and the study can provide a corresponding reference for the selection of vibrating screen parameters.