Justification of parameters and operating modes of a screw feed chopper for livestock farms

Abstract The focus of the research is on developing a new grinder design that uses less energy and metal, starting from a theoretical perspective. The study looks into how the screw cutter system’s quantitative and qualitative indicators relate to geometric factors and speed modes of operation. Only by decreasing the average cut length, or by speeding up the screw knife’s spin, can the degree of stem chopping be increased. According to the knife’s rotation speed, the experiment displays the average slice lengths and the associated productivity of the screw cutting pair. In order to comply with zootechnical criteria, the following modes should be used: n = 400-450 rpm (l av = 5,5-4 cm) with an inclined feed angle of β = 450, and n = 550-650 rpm (lav = 8-4,5 cm) with vertical loading. The productivity of the cutting pair sharply decreases as the knife’s rotation frequency increases. The aforementioned numerical examples demonstrate good agreement with the experimental results and were chosen in accordance with the characteristics of the experimental setup.