Examination of the causes of a bucket wheel fracture in a bucket wheel excavator

Rusiński, E.; Harnatkiewicz, P.; Kowalczyk, M.; Moczko, P.

doi:10.1016/j.engfailanal.2010.03.004

Cited by 41 publications

(19 citation statements)

References 4 publications

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“…It is obvious that the normalizing heat treatment of the shaft did not eliminate the strip-like structure, i.e. the heat treatment procedure was insufficient, reducing significantly material resistance to variable loads and creating favourable conditions for fatigue fractures [26].…”

Section: Visual and Metallographic Inspectionsmentioning

confidence: 99%

Analysis of the Drive Shaft Fracture of the Conveyor Belt for Transport of Coal

Savković

Dedić

Pavlović³

et al. 2019

Teh. vjesn.

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The conveyor belt for slag and coal transport in the open mine pit "Kolubara"-Serbia is driven by means of two drive drums, attached on separate shafts. Each shaft is driven by two electric motors on both sides. During exploitation, the conveyor belt drive shafts are subjected to torques and transverse forces due to belt tension. The gearboxes and the bearing units on both sides of the drive drum support each shaft. A fracture of one of the drive shafts of the conveyor belt occurred at its connection point with the gearbox. The first part of the paper defines the loads relevant for shaft calculation, based on measurements in different phases of operation and the manufacturer's data. It is followed by the FEM analysis and fatigue analysis, for the most unfavourable load case. It has been established that the critical stress value has occurred near the connection point between the shaft and the gearbox, in the fracture zone. The second part of the paper presents chemical composition and mechanical properties of material, as well as metallographic examination of fracture surface. The experimental test procedure shows that the fracture has occurred not because of an error in the material but as a consequence of the inadequate heat treatment. Superposition of two negative influences: material fatigue and inadequate heat treatment, expressed in the cross section at the point of fracture is the main case of the conveyor belt shaft fracture.

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Section: Visual and Metallographic Inspectionsmentioning

confidence: 99%

Analysis of the Drive Shaft Fracture of the Conveyor Belt for Transport of Coal

Savković

Dedić

Pavlović³

et al. 2019

Teh. vjesn.

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“…Structural failures [4,17] in certain cases may lead to catastrophic consequences -machines collapses, as described in [3,18]. Failures of mechanisms [5,11,16,19,[24][25][26] do not bring drastic disruption of structural integrity, but they also cause significant direct costs, as well as indirect costs due to the downtime that substantially diminishes the effects of BWE exploitation [5,6]. Although the current engineering codes and national standards used in calculations ignore the dynamic character of BWE external loads, the investigations of BWE dynamics are extremely important [6].…”

Section: Introductionmentioning

confidence: 99%

The influence of constructive parameters on response of bucket wheel excavator superstructure in the out-of-resonance region

Bošnjak

Oguamanam

Zrnić

2015

Archives of Civil and Mechanical Engineering

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“…Even in regular exploitation conditions, the outstandingly dynamic and stochastic character of the loads caused by soil impacts provides fertile ground for the occurrence of failures of structures or substructures [6][7][8][9][10][11][12] as well as mechanism parts [13][14][15][16][17][18][19][20][21]. Apart from that, BWEs can also be subjected to extraordinary environmental impacts which inevitably lead http to the occurrence of the so-called 'environment-in' defects [22].…”

Section: Introductionmentioning

confidence: 99%