Abstract
The article describes a study of the dynamics of interacting between loosening roller spikes and particles of raw cotton as well as the conditions for the raw cotton particles’ bundling. The process of movement of raw cotton particles was considered on the mesh surface of a fine impurity cleaner; a search was made for ways to intensify the process and to increase its stability. The conditions for imparting a rotational motion to the flyer were determined when the flyer was connected with the supplied layer of raw cotton. Turning the flyer against the axis will twist the fibre bundle that binds the particle to the rest of the cotton mass, and this is a prerequisite for the fibre to bundle. The value of the twist angle will depend on both the frictional force and the time of the force action, which together determine the energy spent on twisting. By piecewise linearization of the P ( t ) curve, the processes of shock loading and unloading of the flyer during interaction with the spike are described in good agreement with the experimental oscillograms of the process. The eccentric interaction of the spike with a particle of raw cotton was considered. The relationship of this interaction with the formation of soft defects in the fibre – bundles – was proven experimentally and theoretically. It is recommended to install spike rollers having a flat front face in the system of raw cotton pre-cleaning. The use of spikes of this shape of the front edge ensures a steady reduction in the number of bundles in the raw cotton fibre, which increases the quality of the fibre and reduces the amount of defects and impurities. As a result of the experimental and theoretical studies, data have been obtained to make it possible to organise the efficient operation of cleaning machines in the cotton ginning industry
Highlights
An important reserve for improving the process of cleaning raw cotton from weed particles is a new direction in the technology of processing raw cotton – preparing raw cotton for cleaning processes by a directed change in its technolo gical properties.The section for preliminary cleaning of raw cotton from small impurities is essentially an element of the roller-type fine impurity cleaner built into a large impurity cleaner
Its main purpose is to remove fine impurities from the mass of raw cotton through a mesh surface, but at the same time it performs a number of auxiliary functions
Some change in the load rise time can be a consequence of the nonlinearity of the loading characteristics as a function of both the shape of the deformable cotton particle and the properties of cotton as a multicomponent material
Summary
An important reserve for improving the process of cleaning raw cotton from weed particles is a new direction in the technology of processing raw cotton – preparing raw cotton for cleaning processes by a directed change in its technolo gical properties. Its main purpose is to remove fine impurities from the mass of raw cotton through a mesh surface, but at the same time it performs a number of auxiliary functions. The state of the product before and after cleaning has been experimentally studied, but it only indirectly characterises the correctness of the adopted process models It is of great national economic importance to solve the problem of establishing a theory of the behaviour of raw cotton in the process of its impact and the use of the basic laws of mechanics in relation to the technological processes of the primary processing of cotton in order to select their most rational parameters that ensure an improvement in the quality of fibres and seeds
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