Zavertannyi B. Structural synthesis of winding mechanisms of rewinding machines.

The dissertation is devoted to structural synthesis, research, development and improvement of winding mechanisms of rewinding machines. Analytical determination of critical equipment speeds, modeling of winding processes, development of new designs of the mechanism and providing recommendations for their design, experimental confirmation of the obtained analytical models are performed. A classification has been developed for existing winding mechanisms of rewinding machines, which facilitates the choice of structure and type of winding mechanism during design. The algorithm of calculation of critical speeds of rewinding machines is specified, the influence of rigidity of bearing supports on frequencies of oscillations of the bobbin holder is considered. The analysis of the process of winding threads allowed to clarify the change in the frequencies of natural oscillations of the equipment depending on the thickness of the package, which in turn made it possible to determine the operating winding speeds. The equipment has been improved with the proposed new rolling roller devices, which allow to increase the productivity of winding machines and to improve the quality of packaging. The dynamic characteristics of the bobbin holder of the winding mechanism are determined taking into account the thickness of the winding body on the package and its rigidity. For new devices, the dynamic characteristics of the rolling roller with suspension, the winding speed of the mechanism, the natural oscillations of the suspension with a linear characteristic of the elasticity of the winding body, the natural oscillations of the suspension with elastic mounting of the stiffening roller were determined. The optimal parameters of the stiffness of the elastic element for basic machines are determined. The magnitude of the influence of bobbin landing on the bobbin holder on the packing weight and the values of critical speeds were analytically determined and confirmed experimentally. For the proposed designs of the rolling roller of the winding mechanisms, the dependences of the slippage of the rolling roller on the surface of the conical package are analytically determined.