Study on friction and conveying characteristics of the pneumatic logistics transmission system

Pneumatic logistics transmission process is one of the key technologies in the fields of medical, food processing and smelting etc., which plays an essential role in achieving the safe, rapid and accurate transportation. How-ever, there are few reports on this system due to its inherent complex characteristics and the significant dif-ferences compared to the traditional pneumatic conveying system. In this paper, experiments of conveying the transfer bottle with and without load were carried out in the self-built pneumatic logistics transmission system in the laboratory. Firstly, different states of the transfer bottle were characterized based on pressure signal analysis and high-speed camera technology. There was a state transition of the transfer bottle from the stationary to the motion as the gas velocity increased and, the critical gas velocities of the loaded and empty bottles were experimentally determined. Second, by conducting force analysis, frictional characteristics of the pneumatic logistics transmission system, and the dynamic friction coefficient of the transfer bottle was obtained. Finally, a model to predict the critical gas velocity of the pneumatic logistics transmission system was developed, by substituting the relation between the pressure drop and the gas velocity into the force balance equation. And, velocities of the transfer bottle at motion state were further evaluated at various gas velocities based on the energy conservation theory.

Automated summary

In this study, experiments were conducted on the transfer bottle in a self-built pneumatic logistics transmission system to investigate its key performance. The different states of the transfer bottle were characterized using pressure signal analysis and high-speed camera technology. Frictional characteristics of the system and the dynamic friction coefficient of the transfer bottle were obtained through force analysis. A model was developed to predict the critical gas velocity of the system, and the velocities of the transfer bottle in motion were evaluated based on the energy conservation theory.