Development and testing of a novel mathematical-physical model for the design of ring armor for the vertical shaft impact crushers

Abstract

This article presents a novel mathematical-physical model for designing and testing a ring armor for vertical shaft impact crusher (VSI) to reduce energy consumption, improve grinding fineness, and enhance product quality. VSI's are crushers for coarse and fine crushing of hard and brittle materials and it is used to improve the particle shape quality of the crushed material. Typical fields of application are in the recycling industry, highway, high-speed railway, high-rise building, hydropower dam construction, concrete mixing station to produce sand and gravel aggregate, and the equipment in artificial sand making and stone shaping.The design of the VSI components has a significant effect on the device's productivity. A suitable contour of the ring armor impact segments has a considerable influence on comminution efficiency. In conventional VSI, the definition of this ring armor contour exclusively empirically, so that the impact angle between the particles of feed material and the ring armor segment is mostly not defined. On the empirical design, the impact angle can be far outside of the optimum impact angle of 90°. In this work, the invention is based on providing ring armor impact segment structure with a high crushing effect. Therefore, a calculation method for designing the ring armor geometry impact segments of VSI is developed and tested. Test results are shown based on a crushing process, a maximum size reduction effect, and the potential of an energy saving of about 8%.