Assessment of safety of large size ring girders in bucket wheel excavators—a case study

Sokolski, M.; Sokolski, P.

doi:10.1201/9781315210469-263

Cited by 1 publication

(3 citation statements)

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“…The vibration diagnostics method was used, among others, to assess the technical condition of large-scale bucket conveyors [12,37]. The method of acoustic diagnostics was also successfully used to assess the technical condition of caterpillar chains.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, any inaccuracies or errors in their design or during their manufacture can lead to serious issues during operation, which is why a monitoring system should be implemented. Among the most severe consequences of defects in the design or manufacture of races and rolling elements are their local strain and decreased durability and loadcarrying capacity [1,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…These additional local stresses occur under the wheeled bogies of slewing units and are usually not considered in preliminary calculations of a steel structure, although in some cases, they can reach relatively high levels [12].…”

mentioning

confidence: 99%

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A Method for Monitoring the Technical Condition of Large-Scale Bearing Nodes in the Bodies of Machines Operating for Extended Periods of Time

Sokolski

Smolnicki

2021

Energies

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Failure of systems applied in machines comprising rolling and slewing bearings usually causes downtime of the entire heavy machine. The problem of failures can be aggravated by extremely difficult operating conditions, such as significant loads or a harsh environment. The entire issue inspired us to develop a method of monitoring the condition of such units. A study was carried out for six different large-scale excavators which examined strain distributions in the tested subassemblies. In order to estimate the technical condition of wheeled bogies, we used the phenomenon of strain propagation caused by the concentrated force acting in the ring girder web. Flamant theory was utilized to describe this phenomenon. Measurements were performed using strain gauges and the obtained results were compared with the FEM model. To determine whether bearing joints were in a good or bad condition, a coefficient of variation and an impulse factor were introduced as diagnostic indicators. It turned out that by evaluating these indicators, it was possible to distinguish between these two conditions. The method was successfully validated on machines that are in operation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%