Assessment of loads at the working attachment of a mine shovel (Part 2)

Assessment of loads at the hoisting and crowding drives of a mine shovel working attachment helps to make a conclusion on the rational paths of the bucket movement in terms of the resource consumption intensity. The first part of the article defined the forces in the hoist winch ropes at the inclination angles of 60°, 70° and 80° relative to the horizon for straightline paths of the bucket movement. It was found that the hoisting force directly affects the crowding force required to ensure the excavation process. The article analyzes changes in the pressure components and defines the values of the pressure force in the main and intermediate positions of the working attachment, as well as the nature of changes in this value. The values of the crowding force for the considered paths of the bucket movement during the bench excavation were found, and it was concluded that the lowest forces are observed at the closest path with the inclination angle of 80° and 70°. The relationship between the hoisting and crowding forces is defined based on the torque values of the motors of the corresponding shovel drives. A complex analysis of the drive operation of the shovel working attachment has been performed, the results of which allowed to determine the basic values of the hoisting and crowding motors operation per cycle for further adjustment of the maintenance and repair intervals.