The influence of the grate shape on the separation of foreign matter from cotton

In serial cleaners, stationary grates with a circular cross section are installed to remove foreign matter. To increase the cleaning effect, an attempt was made to activate the working surfaces of grate bars with polymer coatings. Although they increased the cleaning effect, they did not find industrial application. In recent years, imparting mobility to the grate has been used to improve performance. This is carried out in two ways: a grate which receives movement under the action of a technological load, and when a grate which is forced. To improve the cleaning effect in serrated cleaners, the cross-sectional shape of the grate has a significant influence. The article proposes profile grates from curved configurations of epicycloids. To determine the influence of the cross-sectional shape of the grate on separating impurities from raw cotton, the interaction cotton and the grate at the time of their contact is considered. The forces of separation (τy) are determined in various modules of epicycloids, which depend on the frequency of rotation and the cross-sectional shape of the grate. Given the values of the wrapping angles, the main parameters are the wrapping angle of the grate with the cotton and the relative speed of the cotton along the grate. The angle of the wrapping of the grate with cotton depends on the shape and size of the cross section of the grate.