Abstract:Pellet mill is one of main machines in the feed processing machinery, which occupies an important position in the feed granulation processing. In order to achieve the small quantities production need of pellet feed, the working principle and structural characteristics of the conditioner were investigated, and the main parameters of key components were determined with theoretical analysis. Accordingly, the smallscale axial multipoint gas intake conditioner was designed to be compatible with the smallscale pellet mill. The blade installation angle X1, speed of conditioner X2, and speed of feeder X3 were selected as the influence factors, and the productivity of conditioner Y1, conditioned material temperature Y2 were selected as evaluating indicators, thus the performance optimization experiments were carried out under the quadratic orthogonal rotation design. Based on the software regression analysis Design-Expert 8.0.6 and response surface analysis method, the relationship between the two influence factors and conditioning evaluating indicator was established. The results showed that X1, X2 and X3 were significantly correlated with Y1 and Y2 (P<0.01 and P<0.001, respectively). By using response surface method, the optimal aggregative index could be obtained under the condition that the blade installation angle was 381°, speed of conditioner spindle was 220.6r/min, and speed of feeder was 17.4r/min. Under this scheme, the productivity of conditioner was 12.7g/s and the material temperature after conditioning was 650℃. In this case, the conditioner had the proper productivity and the conditioned material temperature was within the scope of the technical requirements. Therefore, this conditioner has good practicability in the process of conditioning small quantities of feed raw materials; the research provides references for the design of smallscale conditioner and the parameters optimization of processing technology.
