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Safety management at the design stage of rotation node in mobile crane

Krynke Marek, Mielczarek Krzysztof

System Safety : Human - Technical Facility - Environment

2022

Vol. 4, nr 1

116-127

The article analyzes the safety aspects related to the construction and operation of a mobile crane. The load-bearing capacity of the boom sub-assembly rotation node was tested in a mobile crane. When identifying the load, the uneven compliance of the supporting components was taken into account. The considerations are illustrated with an example of a mobile crane slewing bearing with a lifting capacity of 50 tons. The basic problems of building the computational model are discussed and the results of the load bearing capacity of the slewing ring bearing for different positions of the load-bearing component of the tested machine are presented. An analysis of the load of the rolling elements in a slewing ring bearing was carried out and the reasons for changes in the load capacity in relation to the methods of calculating the load capacity, assuming non-deformability of the bearing rings, were indicated. It has been shown that deformations of the supporting frames are so large that they significantly change the distribution of forces transmitted by individual bearing rollers.

Obrót w kompaktowych rozmiarach: igus rozszerza asortyment łożysk wieńcowych

Świat Obrabiarek i Narzędzi

2021

R. 16, nr 2

Analysis of causes and effects errors in calculation of rolling slewing bearings capacity

Krynke M., Mielczarek K.

Production Engineering Archives

2016

Vol. 12, No. 3

38--41

In the paper the basic design features and essential assumption of calculation models as well as the factors influencing quality improvement and improvement of calculation process of bearing capacity of rolling slewing bearings are discussed. The aim of conducted research is the identification and elimination of sources of errors in determining the characteristics of slewing bearing capacity. The result of the research aims at determining the risk of making mistakes and specifying tips for designers of slewing bearings. It is shown that there is a necessity fora numerical method to be applied and that real conditions of bearing work must necessarily be taken into account e.g. carrying structure deformations as the first ones.