Abstract. The approach to the kinematic research of planetary gears which are closed by nonparallel circuit is represented. The analytical dependencies of transmission ratio on geometric parameters using graphic method are obtained. The obtained dependencies are the basis for power analysis accomplishment.
The publication deals with the problem of assessing the mining excavator stability with a variable cab position. It is determined that the efficiency of the excavator cycle operations largely depends on the position of the operator with respect to the boom and body, the glazing area of the cabin, the dimensions of the windows, the width and the number of jumpers. A technical solution is proposed to increase the visibility of mining excavators’ cabs. The design of the mechanism makes it possible to advance the efficiency of using quarry excavators by changing the position of the cabin both in the vertical plane and in the horizontal one. Counterweight mass, an assessment of the turntable equilibrium and the stability of a mining excavator with a variable cab position are performed using standard «MS Excel» tools.
The paper deals with the factors of the possible reasons for the deterioration of the functional characteristics of a career crawler excavator, identifying such factors as “machine - career excavator”, “personnel – excavator drivers”, “materials” and “external environment” as well as secondary causes, main aspects of these factors. The reasons for the failures of the career excavator stick in the conditions of the ore deposits of the Southern Urals are established. It is shown that the greatest number of failures is associated with excavator drivers’ low qualifications and insufficient experience.
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