Analýza průběhu provozního zatížení vstupních pastorků převodové skříně pohonu kolesa na rýpadle KU 800

Abstract

The primary object of the topic of the presented dissertation is the gearbox of the wheel of the excavator type KU 800. Wheeled excavators of this power series are used for overburden mining in the surface mining of brown coal. It forms an integral and very important part of the technological unit, composed of a closed complex of interconnected devices, the aim of which is to disconnect, load, transport and load the mined material into the landfill of the surface mine. KU 800 is a retractable wheel excavator of the TC2 performance series, on a walking chassis with a total weight of 4 613 ton. One of the most important structural elements of wheeled excavators is the wheel drive. Performance, layout, operational reliability and technical service life are among the determining parameters of the mining capabilities of a large machine. During its existence, a number of reconstructions were carried out on KU 800 excavators in connection with the wheel drive gearbox. A fundamental change was made by the installation of an innovative design of the wheel drive gearbox, which was the main carrier of the intensification of the excavator's mining power. The beginnings of the operation of the new gearbox were accompanied by a series of recurring failures, the causes of which were largely eliminated through partial upgrades. The operational axial displacement of the pinion shaft of the third gear remains a persistent operational problem. This fault is due to an accidental exceeding of the bearing capacity of the clamping connection of one of the gears of the third gear with the pinion shaft of the fourth gear. The main idea of this dissertation is to analyze the relationship between the operating pins of the input drive of the wheel drive gearbox, with specific events on individual gears, especially on the helical gearing of the third gear, where the torque flow is divided in both separate branches of the gear. The task for the practical applicability of the knowledge gained is to derive from the results of the performed analysis a specification for the optimization of the critical parts of the wheel drive gearbox, aimed at significantly reducing the risk of failure, increasing reliability, especially in mining requiring the use of the mining capabilities of large-scale machinery at the upper limit of carrying capacity.