Experimental study on the coupled motion of Flip-flow screen plate and granular materials based on target tracking technology

The flip-flow screen is widely applied in dry deep screening processes across various industrial sectors. However, limitations in understanding the motion mechanisms of large-deformation screen plates and material particle groups hinder its further optimization and broader application. Therefore, an experimental platform was constructed to observe the coupled motion, utilizing high-speed imaging and target tracking algorithms to monitor the motion of both materials and the screen plate. The accuracy of the tracking results was validated through comparison with acceleration measurement system data. The study identified the evolutionary patterns of coupled motion states under varying driving frequencies. By analyzing the displacement, velocity, and acceleration of both particles and the screen plate, it was revealed the mechanisms underlying these different motion states. Additionally, the effects of material load and screen tension on the evolution of particle motion states were examined, clarifying the regulation methods of coupled motion states. Results indicate that with a material load of 4 kg and a driving amplitude of 6 mm, within a driving frequency range of 1.5 Hz to 15 Hz, the material particles and the screen plate sequentially exhibit relative static, synchronous periodic motion, period-doubling motion, chaotic motion, and inert motion. Among these states, chaotic motion promotes greater particle activity, benefiting material loosening and segregation. Within the 6 Hz to 15 Hz driving frequency range, reducing the material load or increasing screen tension facilitates the occurrence of chaotic motion. These findings provide valuable insights for the improved application and optimization of flip-flow screens.