SYNTHESIS OF SCREW WORKING BODIES WITH ELASTIC SURFACES AND RESULTS OF WORKING BODY RESEARCH

Screw conveyors are widely used in various sectors of the economy, including the pharmaceutical industry, food and processing industries, as well as agriculture. Screw conveyors have specific requirements that depend on the material being transported. One of the requirements is to be able to safely move materials that are easily damaged, in particular grain masses. The article presents a theoretical justification for improving the efficiency of transportation of bulk materials by screw conveyors. The article also analyzes the latest research on this issue. As a result of the review of sources of information the problems which need to be solved are defined. The aim of the research is to experimentally determine the productivity of bulk material transportation and to establish the degree of injury of grain material by developed screw working bodies with elastic surfaces. To find new variants of screw working bodies with elastic surfaces that would ensure minimal damage to grain materials, the method of synthesis of hierarchical groups using morphological analysis was used. The experiments were performed for different types of working bodies with elastic surfaces: with a continuous chamber-like element; with peripheral elastic brush part; with a brush-like element. The article offers recommendations for choosing the speed of the auger to minimize damage to bulk materials. The rational angle of inclination of the screw working body at which productivity of the screw conveyor will be the maximum is also established. It is established that the productivity increases with the increase of the inner diameter of the auger casing and the frequency of rotation of the screw working bodies in the case of horizontal arrangement. As the angle of inclination of the screw working bodies increases, the productivity of the conveyor decreases.