Strength problems of the travelling mechanisms of the open pit machines
Апстракт
The extremely heavy duty conditions of the Surface Mining Machines (SMM) provide fertile ground for the occurrence of the various types of failures in their travelling mechanisms and belonging substructures. Although failures of the SMM travelling mechanisms occur infrequently, they may lead to very serious or even disastrous consequences. Even in cases when consequences are not catastrophic they cause direct costs, as well as indirect costs due to the downtime that substantially diminishes the effects of SMM exploitation. Furthermore, replacement of damaged parts is executed on site, often in hard working conditions that essentially prolong the downtime of the complete surface mining system. This paper discusses the causes of the failures in the vital parts of the crawler travel gear of the bucket wheel excavators and spreaders: chain links, track wheels, two-wheel bogies and undercarriage. Based on the results of the analytical–numerical–experimental analyses, it was concluded
that:... (a) chain links' failures are caused by 'manufacturing-in' defects; (b) track wheels'
failures are caused by 'design-in' and ' manufacturing-in' defects; (c) failures of the twowheel bogies and undercarriage are caused by 'design-in' defects. Besides that, the redesigned structures of the two-wheel bogies and undercarriage are presented. The validity of the presented reconstruction designs are unquestionably confirmed by their failure less exploitation after the reconstruction. Finally, the obtained results are important because the same problems could arise in the crawler travelling mechanisms of wide class of earthmoving and material handling machines.
Кључне речи:
surface mining machines / crawler travelling mechanisms / damage diagnostics / stress-analysis / experimental investigations / redesignИзвор:
Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology, 2013, 249-254Издавач:
- Banja Luka : Faculty of Mechanical Engineering
Финансирање / пројекти:
- Одрживост и унапређење машинских система у енергетици и транспорту применом форензичког инжењерства, еко и робуст дизајна (RS-MESTD-Technological Development (TD or TR)-35006)
Колекције
Институција/група
Mašinski fakultetTY - CONF AU - Bošnjak, Srđan AU - Petković, Zoran D. AU - Gnjatović, Nebojša AU - Mihajlović, Vaso M. AU - Milojević, Goran PY - 2013 UR - https://machinery.mas.bg.ac.rs/handle/123456789/4912 AB - The extremely heavy duty conditions of the Surface Mining Machines (SMM) provide fertile ground for the occurrence of the various types of failures in their travelling mechanisms and belonging substructures. Although failures of the SMM travelling mechanisms occur infrequently, they may lead to very serious or even disastrous consequences. Even in cases when consequences are not catastrophic they cause direct costs, as well as indirect costs due to the downtime that substantially diminishes the effects of SMM exploitation. Furthermore, replacement of damaged parts is executed on site, often in hard working conditions that essentially prolong the downtime of the complete surface mining system. This paper discusses the causes of the failures in the vital parts of the crawler travel gear of the bucket wheel excavators and spreaders: chain links, track wheels, two-wheel bogies and undercarriage. Based on the results of the analytical–numerical–experimental analyses, it was concluded that: (a) chain links' failures are caused by 'manufacturing-in' defects; (b) track wheels' failures are caused by 'design-in' and ' manufacturing-in' defects; (c) failures of the twowheel bogies and undercarriage are caused by 'design-in' defects. Besides that, the redesigned structures of the two-wheel bogies and undercarriage are presented. The validity of the presented reconstruction designs are unquestionably confirmed by their failure less exploitation after the reconstruction. Finally, the obtained results are important because the same problems could arise in the crawler travelling mechanisms of wide class of earthmoving and material handling machines. PB - Banja Luka : Faculty of Mechanical Engineering C3 - Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology T1 - Strength problems of the travelling mechanisms of the open pit machines EP - 254 SP - 249 UR - https://hdl.handle.net/21.15107/rcub_machinery_4912 ER -
@conference{ author = "Bošnjak, Srđan and Petković, Zoran D. and Gnjatović, Nebojša and Mihajlović, Vaso M. and Milojević, Goran", year = "2013", abstract = "The extremely heavy duty conditions of the Surface Mining Machines (SMM) provide fertile ground for the occurrence of the various types of failures in their travelling mechanisms and belonging substructures. Although failures of the SMM travelling mechanisms occur infrequently, they may lead to very serious or even disastrous consequences. Even in cases when consequences are not catastrophic they cause direct costs, as well as indirect costs due to the downtime that substantially diminishes the effects of SMM exploitation. Furthermore, replacement of damaged parts is executed on site, often in hard working conditions that essentially prolong the downtime of the complete surface mining system. This paper discusses the causes of the failures in the vital parts of the crawler travel gear of the bucket wheel excavators and spreaders: chain links, track wheels, two-wheel bogies and undercarriage. Based on the results of the analytical–numerical–experimental analyses, it was concluded that: (a) chain links' failures are caused by 'manufacturing-in' defects; (b) track wheels' failures are caused by 'design-in' and ' manufacturing-in' defects; (c) failures of the twowheel bogies and undercarriage are caused by 'design-in' defects. Besides that, the redesigned structures of the two-wheel bogies and undercarriage are presented. The validity of the presented reconstruction designs are unquestionably confirmed by their failure less exploitation after the reconstruction. Finally, the obtained results are important because the same problems could arise in the crawler travelling mechanisms of wide class of earthmoving and material handling machines.", publisher = "Banja Luka : Faculty of Mechanical Engineering", journal = "Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology", title = "Strength problems of the travelling mechanisms of the open pit machines", pages = "254-249", url = "https://hdl.handle.net/21.15107/rcub_machinery_4912" }
Bošnjak, S., Petković, Z. D., Gnjatović, N., Mihajlović, V. M.,& Milojević, G.. (2013). Strength problems of the travelling mechanisms of the open pit machines. in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology Banja Luka : Faculty of Mechanical Engineering., 249-254. https://hdl.handle.net/21.15107/rcub_machinery_4912
Bošnjak S, Petković ZD, Gnjatović N, Mihajlović VM, Milojević G. Strength problems of the travelling mechanisms of the open pit machines. in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology. 2013;:249-254. https://hdl.handle.net/21.15107/rcub_machinery_4912 .
Bošnjak, Srđan, Petković, Zoran D., Gnjatović, Nebojša, Mihajlović, Vaso M., Milojević, Goran, "Strength problems of the travelling mechanisms of the open pit machines" in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology (2013):249-254, https://hdl.handle.net/21.15107/rcub_machinery_4912 .