RESULTS OF EXPERIMENTAL STUDIES OF THE WORK PROCESS OF HAMMER SHREDDER

Abstract

Ensuring the uniformity of the flow of the mill feed material to the working parts of the hammer shredder allows increasing its productivity, as well as reducing the energy intensity of the grinding process. To ensure a uniform flow, we produced a drum-type feeder with four troughs, the opposite sides of which are rotated relative to each other. When examining the influence of the arrangement of the feeder relative to the rotor shaft of the shredder, it is revealed that with the longitudinal arrangement the productivity increases by 5...7%, and the process energy consumption reduces by 5...6%. It has been experimentally confirmed that the proposed design of the feeding device provides the most uniform flow of material to the working organs of the shredder in comparison with the commercially available. In order to determine the influence of the amount of in-feed to the working parts of the hammer shredder, investigations were carried out with various design and operating parameters of the feeding device. The analysis of the results made it possible to determine the optimal diameter of the drum of the feeder 0.07 m,and the rotational speed 70 ... 80 min-1 at which the in-feed is 240..280 kg/h. The main working bodies-hammers have a significant  influence on the productivity of the hammer shredder. Analysis of the effect of hammer circumferential velocity equalto 30...40 m/s made it possible to determine the operating parameters of the  hammer rotor. Thus, as a result of the experimental studies, the optimum design and operating parameters of the hammer shredder were established, at which the maximum productivity is 250...300 kg/h, energy consumption of the process is 0.8...1.0 kW·h/kg·unit of measure.