Визначення приведеного коефіцієнту тертя для кільцевих та трубчатих спрямовувачів нитки трикотажних машин

Abstract

В роботі наведені результати досліджень по визначенню приведеного коефіцієнту тертя нитки при її взаємодії з поверхнями кільцевих та трубчатих спрямовувачів круглов’язальних трикотажних машин. Отримані аналітичні залежності у вигляді трансцендентних рівнянь для визначення кута радіального охоплення нитки поверхнею спрямовувача нитки. Для визначення кута охоплення використовувався алгоритм дихотомії та спеціально розроблена програма.

The imperfection of the design of the ring and tubular yarn guides does not allow minimizing the tension during operation of the knitting machine. The peculiarities of the process of thread interaction with the guiding and working organs of knitted machines, when there is a radial engagement with the surface of the guiding element of the thread, leads to an additional increase in its tension up to 30%, which causes breakages. This negatively affects the performance of equipment and the quality of the products being vented. The solution of this problem is of great importance for the improvement of the technological processes of the knitting industry from the viewpoint of increasing the productivity of technological equipment and the quality of the products being let out. Thus, the topic of this article is relevant, which is important for improving the design of existing ring and tube guides and developing new ones. Objects and methods of research. Ring and tubular guides are an integral part of the thread supply system of the technological equipment of the knitting industry. The imperfection of the design of annular and tubular guides does not allow minimizing the tension of the thread during the operation of the technological equipment and leads to a violation of the technological regime. First of all, this affects the features of the process of interaction of the yarn with the guide taking into account the radial coverage of its surface, which is predetermined by the structure and material, the specificity of the filament manufacturing, the length of the individual filaments and their mutual relative relative position, as well as the unevenness of the input tension. Theoretical basis for solving scientific and technical problems are the works of leading scientists in the branches of technology of textile and knitted productions, textile materials science, thread mechanics, elasticity theory, mathematical modeling. In theoretical studies, methods of the theory of algorithms, analytical geometry, experimental planning, and statistical processing of research results were used. When developing software, modern languages of object - oriented programming were used. Practical significance. The improvement of the design of the ring and tube guides of the yarn of knitted machines makes it possible to minimize their tension, reduce the breakage of the yarn, it is important for improving the technological processes of the knitting and garment industry from the viewpoint of increasing the productivity of the technological equipment and the quality of the products being let out.