Research of stacker stability under varying conditions of its work

Abstract

This article deals with the research related to the reengineering of stackers, which were developed and manufactured at the end of the twentieth century and are still in operation at a number of enterprises of the mining and metallurgical complex of Ukraine. For this study, we chose a modernized stacker type U1 SN-1200, which is still in operation at the iron ore pellets storage area of the pelletizing plant of the Central Mining and Processing Plant of Kryvyi Rih. Its modernization involved the removal of a very bulky, heavy outdated aspiration system, which could significantly affect the rollover stability of its platform and lead to the failure of both its individual components and the stacker as a whole. Therefore, the aim of the research was to conduct studies related to determination of the stacker's margin of safety against overturning depending on its design features that have emerged over the course of its operation and performance for materials whose bulk density does not exceed 1,9 t/m³. To achieve this goal, we used calculation and analytical methods in the MathCAD environment. The main source materials for calculations and research were archival drawings of the stacker and its technical passport. The research found that even with its nine-ton aspiration unit removed, the unit, which is significantly offset from the center of gravity of the entire structure, the safety margin of the stacker to overturning, depending on the capacity, is in the range of 1,6-1,9. Installation of an additional 9 t load instead of the aspiration unit, increases the safety margin of the stacker to 2,2, and without it to 1,8 at maximum stacker productivity of 1200 t/h.