The influence of transverse profile of crusher jaws on comminution effects

ABSTRACT: In estimation of comminution effects, apart from process efficiency, forces presented during comminution and comminution level, the grain composition and content of irregular grains in product are very important. The jaw crushers give disadvantageous results of grain symmetry of products, but the very high changeability of crushing forces and individual comminution energy was obtained, dependently on the compressing tool shape. In experimental jaw crusher of straight jaw movement, the jaws with longitudinal ruts of transverse triangular, trapezoidal or circular profile were used. Furthermore, the ruts of various teeth sizes, i.e. of various height (h) and scale (t), were applied. The best results were obtained for jaws with trapezoidal ruts, of proportionally low scale t(t=1,1e) - where e is the output rift size – and high values of teeth height h(h=0,8e). The industrial efforts confirmed the results given in laboratory scale