RESEARCH OF THE INFLUENCE OF PACKING DISPLACEMENT ALONG THE BOBBIN HOLDER AXIS ON CRITICAL SPEEDS

Abstract

Creation of a mathematical model of the mechanism of winding of rewinding machines, research of influence of size of shift of packing on critical speeds and development of recommendations for the decision of the set task. Method. When working out the thread for packaging, high-speed winding mechanisms are subject to high requirements, both for the quality of the resulting packaging and for the speed of the bobbin holder. When installing the spool on the spool holder, it is possible to shift it in the axial direction from the design position, which leads to a change in the position of the center of mass of the package with the spool, and in accordance with changes in dynamic loads on the spool holder. Therefore, there is a need to determine the magnitude of the impact of the displacement of the package along the axis of the bobbin holder on the operating speeds of the equipment and the quality of the resulting packages. In the winding process, the placement of the package on the bobbin holder of the winding mechanism of the rewinding machine plays an important role. The displacement of the center of mass of the package affects both the operating speed of the equipment and the quality of the package. In rewinding machines, a mechanism for controlling the thickness of the package is installed, which controls the speed processes during winding. When the coil is shifted towards the top of the cone, incomplete packing (less weight) is developed. When shifted to the side opposite the top of the packing cone, on the contrary, the weight of the packing increases. In addition, the magnitude of the displacement of the package affects the dynamic loads of the winding mechanism. Results. The influence of the magnitude of the packing displacement along the axis of the bobbin holder on the critical speeds of the winding mechanism and the quality of packing is determined. Scientific novelty. The study and analysis of the influence of the magnitude of the displacement of the bobbin with packaging on the critical speeds of the winding mechanism are conducted. The magnitude of the influence of the position of the masses of the center of the coil with packing relative to the bobbin holder on the value of the critical speeds of the winding mechanism is determined. The obtained results allow to control the range of working speeds of the winding mechanism depending on the parameters of the position of the spool on the spool holder, which can be used to adjust the speed of the winding process when packing the spool and make changes when designing the rewinding equipment. The method of determining the maximum possible speeds in the process of rewinding textile material on rewinding machines with direct drive of the bobbin, taking into account the position of the bobbin on the bobbin holder, which can be used in the design of new mechanisms or modernization of existing ones. Practical significance. A dynamic model of the winding mechanism has been developed. The magnitude of the influence of packing displacement on critical speeds is shown. Methods and designs for improving the quality of packaging and stable operation of equipment are proposed.