ENERGY-SAVING MIXING UNIT FOR THE PREPARATION OF DRY BUILDING MIXES

The article describes an experimental installation of an energy-saving mixing unit for the preparation of dry building mixes. The installation consists of a receiving device for loading various components, a mixing chamber, which includes two shafts with blades that allow to intensify the process of movement of the components of the mixture, and thereby reduce the time for mixing them. The shafts are driven by two electric motors, a valve is provided for unloading the finished mixture, installed in the lower part of the mixing chamber, which is controlled by a pneumatic system for quick operation. The article presents the results of experimental studies to establish the influence of the structural and technological parameters of the mixer: the angle of inclination of the blades, the circumferential speed of their rotation and the mixing time on the qualitative characteristics of the mixing process of dry building mixes. It was found that an increase in the angle of inclination of the blades leads to an increase in the power spent on the mixing process of the components. This is due to the fact that with an increase in the angle of inclination of the blade, it is accompanied by an increase in the resistance to mixing, as the area of its contact with the mixture increases. An increase in the rotation frequency of the rotors entails a proportional increase in power. With an angle of inclination of the blades equal to 45 ° to the direction of its movement, the best result of preparing the mixture is achieved.