25. Experimental Study of the Rolling Friction Coefficient in Highly Loaded Supports of Rotary Kilns

The results of rolling friction experimental research of two cylindrical rollers on the special testing stand, which imitates the operation of a rotating kiln support unit, are presented in this article. The rolling friction moment is determined using the special plate clutch on the driving roll shaft. The rolling peripheral velocity, radial load and the rollers contact surfaces condition are the variable parameters. The actual values of the rolling friction coefficient under different rolling conditions are calculated. The regularities of rolling friction coefficient changes from the rolling speed, oil viscosity and contact pressure from the radial load, which is corresponding to the real values in the basic support units of industrial rotary kilns, are established. The wear intensity effect on the rolling friction moment is determined. The range of the rolling friction coefficient, which should be taken into account in the calculations of power losses in support units of large-dimension rotational assemblies, are recommended.