Back to search

Integrated evaluation of the stress-strain state of metal structures of the working equipment of a mining excavator

Authors: Nabiullin R.Sh.

Operating experience and analysis of documents of the maintenance and repair service of the Mining Administration shows that most often cracks in EKG-20 excavators are formed in the metal structures of working equipment, and that it is important that cracks often occur in the base metal, especially for the excavator boom. Due to the formation and growth of cracks, the service life of this basic excavator assembly is significantly reduced, which in theory should have the necessary safety margin to ensure the required level of machine reliability. In the total share of failures of excavators due to failure of supporting metal structures, defects in the metal structures of working equipment account for up to 70%. To establish the real reasons for the formation of cracks on the metal structures of the working equipment of the EKG-20 excavators, an assessment was made of indicators characterizing the actual loading of the metal structures of the working equipment in real operating conditions. The actual technical condition of the working equipment units was assessed on the basis of parameters that allow taking into account such important components as: fatigue, residual stresses and deformations, changes in the metal microstructure that the equipment acquired during operation under cyclic loading conditions. Stress concentration zones are identified and their boundaries are determined. The deformations are determined and the stresses arising under the action of working loads in various operating modes in the areas of stress concentration, metal structures of the handle and boom of the excavator are calculated. Based on the calculation results, a selection of the maximum tensile and compressive stresses that occur in the established stress concentration zones was made. The assessment of the identified stress concentration zones as sources of fatigue damage initiation was carried out.

Keywords: working equipment, main mechanisms, mining excavators, loading, metal structures, deformations, stresses, metal fatigue, stress-strain state, stress concentration zone.
For citation:

Nabiullin R. Sh. Integrated evaluation of the stress-strain state of metal structures of the working equipment of a mining excavator. MIAB. Mining Inf. Anal. Bull. 2023;(12−1):93—105. [In Russ]. DOI: 10.25018/0236_1493_2023_121_0_93.

Issue number: 12
Year: 2023
Page number: 93-105
ISBN: 0236-1493
UDK: 622.271
DOI: 10.25018/0236_1493_2023_121_0_93
Article receipt date: 15.05.2023
Date of review receipt: 27.09.2023
Date of the editorial board′s decision on the article′s publishing: 10.11.2023
About authors:

Nabiullin R. Sh., Cand. Sci. (Eng.), assistant professor, department of mining machines and complexes, «Ural State Mining University», Ekaterinburg city, e-mail: nabiullin.r@m., ORCID ID: 0000-0001-7519-2156.

For contacts:

1. Shutova M. N., Evtushenko S. I., Gontarenko I. V. A determination of reliability and technical conditions category of the damaged metal construction using the numerical experiment. Bulletin of Higher Educational Institutions. North Caucasus region. Technical Sciences. 2018, no. 4, pp. 98−104. [In Russ]. DOI: 10.17213/0321-2653-2018-4-98−104.

2. Saraev Yu. N., Bezborodov V. P., Gladkovsky S. V., Golikov N. I. On improving reliability of metal structures when operating at low climatic temperatures through the integrated use of modern methods of modification of the zone welded joint. Svarochnoe proizvodstvo. 2016, no. 9, pp. 3−9. [In Russ].

3. Poderni R. Yu., Bules P. Comparative analysis of hydraulic and mechanical excavators with a straight shovel. Mining Journal. 2015, no. 1, pp. 55–61. [In Russ]. DOI: 10.17580/ gzh.2015.01.10.

4. Nasonov M. Yu., Iungmeister D. A., Do Duc Trong. Endurance evaluation of metal structures containing cracks in mining shovel EKG-10. MIAB. Mining Inf. Anal. Bull. 2022, no. 11, pp. 67–79. [In Russ]. DOI: 10.25018/0236_1493 _2022_11_0_67.

5. Seroshtan V. I., Gaah T. V. Process of formation of cracks in metal structures of cargolifting cranes. News of the Tula state university. Sciences of Earth. 2016, no. 5, pp. 213−220. [In Russ].

6. Fadeev D., Ivanov S. Features of the walking mechanism of a floating platform autonomous modular complex for the extraction and processing of peat raw materials. Scientific and Practical Studies of Raw Material Issues. Proceedings of the RussianGerman Raw Materials Dialogue: A Collection of Young Scientists Papers and Discussion, 2019. London, CRC Press / Taylor & Francis Group, 2020, pp. 239−243. DOI: 10.1201/9781003017226−33.

7. Krasnyy V. A., Maksarov V. V., Maksimov D. D. Improving the wear resistance of piston rings of internal combustion engines when using ion-plasma coatings. Key Engineering Materials. 2020, vol. 854, рр. 133−139. DOI: 10.4028/

8. Nasonov M. Yu., Lykov Yu. V., Do Duc Trong. The study of the resource and durability of metal structures of excavators after the expiration of the service life. Ugol’ — Russian Coal Journal. 2020, no. 2, pp. 13–17. [In Russ]. DOI:−17.

9. Manyele S. Investigation of excavator performance factors in an open-pit mine using loading cycle time. Engineering. 2017, vol. 9, pp. 599−624. DOI: 10.4236/eng.2017.97038.

10. Makarov A. P., Shevchenko A. N., Pavlov A. M. Determination of the critical length of a crack in the metal structures of quarry excavators. Proceedings of Irkutsk State Technical University. 2015, no. 12, pp. 57−63. [In Russ].

11. Nikitin I. S., Burago N. G., Nikitin A. D., Yakushev V. L. Determination of the critical plane and assessment of fatigue durability under various cyclic loading regimes. PNRPU Mechanics Bulletin. 2017, no. 4, pp. 238−252. [In Russ]. DOI: 10.15593/perm. mech/2017.4.15.

12. Gorbovets M. A., Khodinev I. A., Ryzhkov P. V. Equipment for testing low-cycle fatigue with a «hard» loading cycle. Trudy VIAM. 2018, no. 9, pp. 51−60. [In Russ]. DOI: 10.18577/ 2307-6046-2018-0-9−51−60.

13. Komissarov A. P., Lagunova Yu. A., Nabiullin R. Sh., Khoroshavin S. A. Digital model of shovel work process. MIAB. Mining Inf. Anal. Bull. 2022, no. 4, pp. 156–168. [In Russ]. DOI: 10.25018/0236_1493_2022_4_0_156.

14. Komissarov A. P., Shestakov V. S. Simulation model of hydraulic excavator working equipment functioning. Mining Equipment and Electromechanics. 2013, no. 8, pp. 20–24. [In Russ].

15. Kuvshinkin S. U., Zvonarev I. E., Ivanova P. V. Relationship of dynamic properties of mine excavator hoisting mechanism versus design parameters of operating equipment. Journal of Physics: Conference Series. 2018, vol. 1118, no. 1, pp. 1−5. DOI: 10.1088/1742−6596/1118/ 1/012054.

16. Le Q. H., Jeong Y. M., Nguyen C. T., Yang S. Y. Development of a Virtual Excavator using SimMechanics and SimHydraulic. Journal of Drive and Control. 2013, vol. 10, iss. 1, pp. 29–36. DOI: 10.7839/ksfc.2013.10.1.029.

17. Shibanov D. A., Ivanov S. L., Yemelyanov A. A., Pumpur E. V. Evaluation of working efficiency of open pit shovels in real operating conditions. MIAB. Mining Inf. Anal. Bull. 2020, no. 10, pp. 86−94. [In Russ]. DOI: 10.25018/0236-1493-2020-10−0-86−94.

18. Skibin G. M., Shutova M. N., Evtushenko S. I., Chutchenko I. A. Reliability increase of running gears elements of mining traction locomotives using finite-element analysis package. IOP Conference Series: Earth and Environ-mental Science. 2017, vol. 87, no. 2, article 022021. DOI: 10.1088/1755−1315/87/2/022021.

19. Lakhova E. N. Methods of predicting the performance of critically loaded machine building objects, Candidate’s thesis, Saint-Petersburg, 2012, 18 p. [In Russ].

20. Shibanov D. A., Ivanov S. L., Shishkin P. V. Digital technologies in modeling and design of mining excavators. Journal of Physics: Conference Series. 2021, vol. 1753, no. 1, article 012052. DOI: 10.1088/1742−6596/1753/1/012052.

21. Bolobov V. I., Chupin S. A. About the use of 110G13L steel as a material for the excavator bucket teeth. IOP Conference Series: Earth and Environmental Science. 2019, vol. 378, no. 1, article 012005. DOI: 10.1088/1755−1315/378/1/012005.

22. Nabiullin R. Sh., Maltsev V. V. Selection of equipment for tensometric support of force tests. Proceedings of the XX International Scientific and Technical Conference “Readings in Memory of V. R. Kubachek”, held as part of the Ural Mining Decade, Yekaterinburg, USGU, 2022, pp. 56–59. [In Russ].

23. Dubov A. A. Metrological aspects in the method of metal magnetic memory. World of measurements. 2018, no. 3, pp. 42–45; no. 4, pp.16–18. [In Russ].

Our partners

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.