Volianyk O. Improvement of centrifugal devices for processing light industry products

The dissertation is devoted to the improvement of the existing drum centrifugal machines in order to expand the directions of their application, increase the productivity and intensity of processing of materials and products of light industry, increase energy efficiency. The mechanism of construction of the centrifugal drum machine for liquid processing of materials is investigated. It is established that during work under load there is an imbalance of a design. The sources of vibration, the main structural units and connections that are under the influence of vibration are considered and analyzed. It was found that the nature of the movement of material in the drum of the centrifugal machine is uneven, which is largely the result of the use of intensifiers with flat sloping faces. The nature of oscillations in centrifugal mechanisms and their main characteristics are studied. The vibrations that are typical for centrifugal drum machines used in light industries are indicated. The forced oscillations of centrifugal machines are analyzed and mathematical dependences are determined, which describe the nature of the system motion in the event of forced oscillations. It is determined that this type of oscillation does not depend on the initial conditions, and to change the amplitude of oscillations it is advisable to replace the operating parameters of the system, such as rigidity of support elements, the principle of mass distribution, the design of the machine. Experimental studies were conducted to verify the adequacy of the results of analytical studies of the interaction of the processed material with the ridges of the drum in different modes of rotation. The stability of structures of centrifugal machines under vibration loading is investigated, its character and influence on durability of structures are defined. Experimental researches of influence of constructive parameters of ridges of a drum on intensity of processing of material are carried out, intensification of processing of material at change of constructive parameters of working bodies of a drum is investigated. Also in the experimental section the methods of vibration diagnostics of centrifugal machines were considered, the vibration resistance of structures was investigated. Keywords: centrifugal machines, drum machines, rotation, mixing, imbalance, vibration