The Influence of Technological Parameters on Mine Hoisting Cage in Dynamic Conditions

Modern mining industry imposes lots of requirements on mine hoisting equipment associated with hoisting speed, height and payload. To satisfy these needs hoisting equipment should be designed in a proper manner, which requires reliable information on process parameter values. This paper presents the results of strain measurements in a mine hoisting cage. The experiment was designed in order to get the dependence of cage strains and technological parameters, i.e. the hoist heigh (rope lenght), cage acceleration and payload. These data can be used for estimation of stresses and coefficients of safety and their comparison to those given in Regulations of Tecnical Normatives in Mines reffering to people and freight hauling, [1]. These results are also useful in validation of mathematical models and realized technical solutions. 1. INTRODUCTION Mine hoisting equipment represents complex intermittent transport machinery with several transporting operations during freight haulage in one transportation cycle. Theoretical analysis of hoisting equipment stress-strain state is based on some assumptions which can produce mathematical models that differ from the real system, especially in transient periods when dynamic forces appear. In that sense experimental measurements are used to capture real values of relevant physical quantities, which can be used for correction of established theoretical models or validation of realized design solutions. The results of strain measurements of two-storey hoisting cage which were conducted in real conditions (in-sity) are presented in this papaer. The measurements were performed during acceleration and deceleration of the cage when moving up and down. The strain rates and consequent stresses in hoisting equipment components change depending on the cage location in the shaft (height), hoisting speed (acceleration), freight weight, resistance force and so on.