Navoi State Technology of Mining and Technology, Navoi, Uzbekistan:

R. U. Dzhuraev, Head of Department, Doctor of Engineering Sciences

NUST MISIS’ Division in Almalyk, Almalyk, Uzbekistan
G. E. Raikhanova, Head of Department, Candidate of Engineering Sciences

NUST MISIS, Moscow, Russia
S. G. Gubanov, Associate Professor, Candidate of Engineering Sciences, sg.gubanov@yandex.ru

A promising trend of mechanization in open pit mineral mining is the use of high-power hydraulic excavators. Modern excavators are the hi-tech and expensive equipment which requires high-quality maintenance under increasing complexity of hard rock excavation and with the growing depth of open pit mines. The excavator bucket and its cutting and protecting elements exist in continuous contact with rocks. It is of concern currently to investigate the causes and size of wear, and the methods of wear protection as the condition of the bucket directly influences the excavator repair cost and, consequently, the machine performance. However, the issues connected with the reduction in operating cost of mechanical systems of buckets and with the enhancement of excavator reliability remain yet to be solved. The related research becomes increasingly more relevant. The introduction of the advanced equipment and its maintenance provides a company with competitive advantages, and the research of the modern mechanisms becomes critical for large mining companies, including Navoi Mining and Metallurgy. This article describes the scientific results on the enhancement of operating efficiency of hydraulic excavators by means of extension of durability of excavator bucket cutting elements through introduction of the advanced engineering solutions and process designs. The developed engineering solutions were introduced at Auminzo-Amantoi open pit, Central Mine Management, Navoi Mining and Metallurgy Combinat. As a result, the annual maintenance cost of hydraulic excavator HITACHI EX-1200 was cut down by 12 %.

1. Poderni R. Yu. Mechanical equipment of open pits : Tutorial. 6^th enlarged and revised edition. Moscow : Izdatelstvo Moskovskogo gosudarstvennogo gornogo universiteta, 2007. 680 p.
2. Solovev S. V., Kuziev D. A. Dragline esh-10/70 linkage stiffness parameters study. Ugol. 2017. No. 1. pp. 37–38.
3. Klementeva I. N., Kuziev D. A. Extracting-and-loading dragline with innovative design bucket. GIAB. 2019. No. 7. pp. 149–157.
4. Kvaginidze V. S., Kozovoy G. I., Chakvetadze F. A., Antonov Yu. A., Koretskiy V. B. Excavators in open pit mines. Design, operation, calculation : Tutorual. Moscow : Gornaya kniga, 2011. 409 p.
5. Galiev S. Zh., Uteshov E. T., Galiev D. A., Farakhov K. A. Methods and techniques for energy efficiency assessment of geotechnological facilities at opencast mines based on the in-depth analysis. Eurasian Mining. 2021. No. 1. pp. 65–69. DOI: 10.17580/em.2021.01.13
6. Krivenko A. E., Zhang Kuok Khanh. Influence of power fluid temperature in hydraulics on operating efficiency of hydraulic mining excavators. Gornyi Zhurnal. 2020. No. 12. pp. 78–81. DOI: 10.17580/gzh.2020.12.18
7. Raykhanova G. Y., Djuraev R. U., Turdiyev S. A. Development and experimental results of a new construction of the element of protection of the base of the Jave part of quarry excavators. The American Journal of Engineering and Technology. 2022. Vol. 4, No. 4. pp. 58–67.

8. Raykhanova G. Y., Djuraev R. U., Turdiyev S. A. Development of a new design of cutting elements for quarry excavator buckets and results of its experimental research. The American Journal of Engineering and Technology. 2022. Vol. 4, No. 4. pp. 68–78.
9. Turdiyev S. A., Djuraev R. U., Zhuraev A. S. Experimental and test study of the effectiveness of the improved design of the excavator bucket jaw plate. Central Asian Research Journal For Interdisciplinary Studies. 2022. Vol. 2, Iss. 3. pp. 214–222.
10. Komissarov A. P., Lagunova Yu. A., Nabiullin R. Sh., Khoroshavin S. A. Digital model of shovel work process. GIAB. 2022. No. 4. pp. 156–168.
11. Lukashuk O. A., Komissarov A. P., Lagunova Yu. A. Developing a digital control system for the main drives of an open-pit excavator as a major field of increasing the efficiency of excavator operation. IOP Conference Series: Materials Science and Engineering. 2020. Vol. 709, Iss. 2. 022117. DOI: 10.1088/1757-899X/709/2/022117
12. Klementieva I. N., Kuziev D. A. Maximal stiffness of elastically damping device in traction of draglines. Gornyi Zhurnal. 2021. No. 5. pp. 79–83. DOI: 10.17580/gzh.2021.05.09
13. Rakhutin M., Simba N., Khoroshavin S. Analysis of the dependence of the stressed state of the tracked track of a career excavator from an angle slope. Ural Mining Decade : XVIII Scientific Forum. 2020. E3S Web of Conferences. 2020. Vol. 177. 03015. DOI: 10.1051/e3sconf/202017703015
14. Fox M. T., Chong E. K. P. Constrained Optimization of a Hydraulic Actuation System. Energies. 2022. Vol. 15, Iss. 15. 5711. DOI: 10.3390/en15155711
15. Khedkar Y., Nagpure H., Dendage P., Shinde P., Naikavade S. et al. The evaluation of forces acting on excavator bucket and its capacity. Materials Today: Proceedings. 2022. Vol. 68, Iss. 1. DOI: 10.1016/j.matpr.2022.10.013
16. Zuhe Qin. Modeling and Simulation of Theoretical Digging Force of an Excavator Based on Arbitrary Posture. Mathematical Problems in Engineering. 2022. Vol. 2022. DOI: 10.1155/2022/8030349
17. Zhigui Ren, Jiahao Li, Xiaoping Pang, Jurong Liu, Tianyu Li et al. Research on the matching characteristics of the theoretical digging force of a backhoe hydraulic excavator. Scientific Reports. 2022. Vol. 12. 16181. DOI: 10.1038/s41598-022-19976-x
18. Motoki Sato, Yuta Tsunano, Katsuya Sano, Shinichi Warisawa, Masanori Aizawa et al. Evaluation of excavation motion sequence for hydraulic excavators based on extraction of excavation style and phase. Journal of Field Robotics. 2022. Vol. 39, Iss. 7. pp. 1110–1120.