The Dynamics of Impacts Tools the Loading Boom Bucket Wheel Excavators

Abstract

One of the major problems of long-distance belt conveyor technology, and not only in the North Bohemian mines, are impacts of rock blocks on the belts which increases the belts wear and reduces their service life. Therefore, in this paper there are widely discussed the rock impacts dynamics, a new type of device - the impact rods intended for significant reducing the number of punctures in the conveyor belts and thus for prolongation of their service life and modeling of the proposed devices. Application of the impact rods is estimated in the impact stands of the systems of conveyors removing the coal extracted by the bucket wheel excavator KU 300.

Failure analysis of conveyor belt in terms of impact loading by means of the damping coefficient

“…Authors Gondek, Neruda, Pokorny [11] extensively discussed the rock impact dynamics, a new type of device -the impact rods intended for significant reduction of the number of punctures in conveyor belts and thus for the prolongation of their service life and modelling of the proposed devices.…”

“…Estimates of the regression model parameters(11).sThe point estimate The lower limit of 95% of the estimate The upper limit of 95% of the estimate…”

Risk of excavators overturning

“…The excavator’s widespread appeal stems from its inherent versatility which is achieved via hydraulic implementation lines that enable various types of attachment to be fitted to the machine’s dipper (or stick). These attachments extend the functionality of the excavator and include: impact hammers and shears for demolition (Barsottelli and Avci, 2013); various bucket specifications for mass excavation earthworks (Seo et al , 2011), dredging (Patel et al , 2015) and loading rock (Gondek et al , 2014); crushing and screening attachments (Bansal and Singh, 2015); compaction plates (Edwards et al , 2003); clamshells (Cruickshank et al , 2011); and hydraulic grabs for materials handling (Edwards et al , 2003). This versatility has evolved in a Darwinian manner as the excavator has been adapted to numerous working environments and the operational tasks required within these – such adaptability has caused excavators to be likened to Swiss army knives (Edwards et al , 2003).…”