Bucket wheel excavators with a kinematic breakdown system : identification and monitoring of the basic parameters of static stability of the slewing superstructure

Abstract

Identification of the basic parameters of static stability (BPSS) of the slewing superstructure is the key step in solving the problem of its static stability, as well as static stability of the entire bucket wheel excavator (BWE). Specificity of the slewing superstructure examined in this paper lies in the kinematic breakdown system (KBS) which prevents the loss of static stability on the counterweight side. Development of a unique method for the formation and two-step validation of the calculation models for this particular design concept was the main objective of the presented research. A two-step validation of the analytical models is conducted based on the experimental results. As the outcome, the final calculation model formed in such manner represents an accurate basis both for the proof of static stability and for the monitoring of the BPSS during exploitation. By comparing the results of the control weighing and the referent values of the final calculation model it was concluded that the existing double-walled bucket wheel represents a 'weak point' of the considered BWE.

Strength analysis of welded joints in support structures of heavy machinery subjected to changeable loading conditions

“…Prevention and identification of failures are fundamental in ensuring the reliable operation of BWE. Damages that render a machine nonfunctional generate high costs [35]. For example, 1 hour of downtime of this type of large-scale machine costs over €11,000 [7].…”