Investigation of the contact interaction of the working bodies of machines with raw cotton

Abstract

Based on the technological process of processing raw cotton, the friction conditions of various units of friction pairs interacting with raw cotton and cotton fiber are analyzed with the elucidation of the influencing factors on the friction force in the contact zone. When rubbing composite polymer materials with raw cotton, depending on the contact conditions of rubbing pairs in various friction units with repeated contact formation and destruction of bonds in the contact zone, electric charges arise and accumulate, which increases the tension in the double electric layer in the contact zone. Forming electric charges in the contact zone, together with other components of the friction force, significantly affect the change in the antifriction properties of the materials used. Based on the analysis of a friction pair in contact with raw cotton and cotton fiber, the main shortcomings of the existing methods for assessing the antifriction properties of the studied polymeric materials and coatings based on them were established, as a result of which specific requirements were developed for the development of methods and installations for determining the complex antifriction properties of the material of rubbing parts, pairs of working bodies of cotton machines and mechanisms. General requirements have been established for materials for working in a friction pair in contact interaction with raw cotton and cotton fiber under various conditions of humidity and exposure to any climatic factors, as well as varying degrees of contamination of the mass of raw cotton. Considering certain requirements for assessing the antifriction properties of the developed compositions of polymeric materials, a modular installation was created for a one-time assessment of temperature, friction force, and static electric charge using modern information technologies.