Influence of Vibration Parameters on Disperse Materials Friction Coefficient

摘要

In technological processes where disperse materials are used, including processes for reducing interparticle and outer friction values, they use vibration, which enable to reduce significantly compaction pressure and increase uniformity of compacted parts density, and also intensifies processes of filling, unloading, dosing, mixing, separation of disperse materials. But now there are no methods or equipment for definition interparticle and outer friction values of disperse materials depending of vibration parameters. The point of the method is in the following. An empty container for a powder is fixed on a vibrator table. Inside the container a cylinder counterexample, which is mounted on a electric motor shaft, is placed coaxially, but it does not each the bottom. The electric motor is turned on and they define the resistance Mo moment to the counterexample rotation. Than they turn the vibrator on and define resistance Mi.-.Mn moments to the counterexample rotation at certain fixed vibration parameters. Then the container is filled with a disperse material under investigation, and they define resistance Mi...Mn moments to the counterexample rotation at the same fixed vibration parameters. The coefficient of a disperse material friction with the counterexample without vibration and at certain fixed vibration parameters are derived from the following expression: f_i=K(M'_i-M_i)/(ω~2SP) where: K - coefficient, taking into account the counterexample shape (for a cylinder one it is 2,97); ω - the counterexample rotation speed c' ; S - the counterexample square that is in a disperse material, m ; P - mass of a powder under investigation, kg.