Flexural motion characteristics of strong vibration elastic screen surface and 3 mm screening effect optimization

Coal preparation serves as a fundamental technology for achieving clean and efficient utilization of coal, while screening constitutes a critical unit operation within this process. Conventional screening methods often exhibit limited effectiveness in the efficient screening of moist fine coal, poor particle permeation and low screening efficiency. In this study, a strong vibration elastic screening method was proposed, and the flexural motion characteristics of the screen surface with the excitation parameters was explored. The motion behavior of the material was analyzed during screening process, and the influence of the excitation frequency, excitation force and processing capacity on the 3 mm screening efficiency was discussed. The results show that the attached impact beam below the screen surface collided with the screen during the screening process, inducing flexural deformation in the elastic screen surface (ESS). This deformation facilitated the passage of lodged particles and effectively prevented blinding. By regulating key parameters such as the excitation force and frequency, the degree of flexural deformation of the screen surface could be adjusted, thereby achieving improved screening performance. Under the small vibration of the screen body, the screen surface can output a larger vibration intensity. When the excitation force was 7.66 kN, the excitation frequency was 16.67 Hz, and the feed rate was 15.42 t/(h-m2), the screening efficiency reached the maximum value of 90.56%. This study provides new insights for the efficient screening of fine materials.