Polytechnic Institute (Branch), Ammosov North-Eastern Federal University, Mirny, Russia:

K. O. Tomsky, Associate Professor, Candidate of Engineering Sciences, kirilltom@mail.ru
M. S. Ivanova, Associate Professor, Candidate of Chemical Sciences

Mirny Mining and Processing Plant, ALROSA, Mirny, Russia:

O. O. Tomsky, Deputy Head on Mining Equipment Repair

ALROSA company widely uses mineral processing machines and plants of the domestic and foreign manufacture. Diamond rock processing extensively employs soil pumps mostly represented by the domestic-manufacture pumps of the type of GRAT. Bearing boxes of the pumps are among the most critical units that govern operation of the entire pumping assembly. From the analysis of operational characteristics of bearing boxes at Processing Plant 3 at ALROSA in 2015, only 8% of the replaced bearings worked out their design life. The limited life determinants are unbalanced wheels and hard heating of bearings due to high specifi c loading and rotation velocities. Aiming to lower the temperature and to improve the heat removal, it is suggested to use bimetals in bearing boxes of pumping assemblies. For the improved heat removal from the surface of bearings, it is proposed to install a heat-removing plate made of a material with the high thermal conduction characteristics in the pump body part that contacts the bearing collar. The experimental research into heating temperature at the friction surface of bimetals with the heat-removing insertions of diff erent sizes has shown that it is possible to reduce the heating temperature by 50% depending on the size of the heat-removing insertion. Subject to the contact loading and rotation velocities of the pump shafts, it is possible to select an optimal size of the heat-removing insertion and, thus, to improve heat removal from the bearing box and, accordingly to lower heating temperature of bearings.

1. ALROSA Official Website. Available at: http://www.alrosa.ru (accessed: 25.06.2016).
2. Zverevich V. V., Perov V. A. Basis of mineral concentration. Moscow : Nedra, 1971. 216 p.
3. Adamov E. V. Basis of design of concentration plants : tutorial. Moscow : Izdatelskiy dom MISiS, 2012. 647 p.
4. Nikolaev M. V., Grigorieva E. E., Gulyaev P. V. Assessment of risks influencing innovation activity of industrial enterprises (on example of diamond-brilliant complex). Eurasian Mining. 2016. No. 2. pp. 6–10. DOI: 10.17580/em.2016.02.02
5. Brusova O. M., Kuzmin S. L. Application of vibrodiagnostics for definition of technical state of soil pumps at the concentration plants of SSGPO JSC. Urgent problems of increasing the efficiency and safety of exploitation of mining and oil-field equipment : materials of the I International scientific-practical conference “Mining electromechanics-2014”. Perm : Izdatelstvo Permskogo natsionalnogo issledovatelskogo politekhnicheskogo universiteta, 2014. pp. 109–114.
6. Brusova O. M. The problem of increasing soil pumps lifetime. Vestnik Permskogo natsionalnogo issledovatelskogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo. 2014. No. 10. pp. 98–106.
7. Brecher C., Hassis A., Rossaint J. Cage Friction in High-Speed Spindle Bearings. Tribology Transactions. 2014. Vol. 57, Iss. 1. pp. 77–85.
8. Khebda M., Chichinadze A. V. Triboengineering reference book : in three volumes. Moscow : Mashinostroenie, 1992. Vol. 3. Triboengineering of antifriction, friction and adhesive tools. 730 p.
9. Kim C., Kim H.-S. Analyses of Influence of Frictional Heat on the Contact Stress of High-speed Microgears. Composites Research. 2015. Vol. 28, No. 4. pp. 244–248.
10. Sorokatyi R. V., Dykha A. V. Analysis of Processes of Tribodamages under the Conditions of High-Speed Friction. Journal of Friction and Wear. 2015. Vol. 36, No. 5. pp. 422–428.
11. Kragelskiy I. V., Mikhin N. M. Friction knots of machines : reference book. Moscow : Mashinostroenie, 1984. 280 p.
12. Chichinadze A. V., Braun E. D., Bushe N. A. et al. Tribology basis (friction, wear, lubrication) : tutorial for universities. Second edition, revised and enlarged. Moscow : Mashinostroenie, 2001. 664 p.
13. Zhao Chunjiang, Yu Xiaokai, Huang Qingxue, Ge Shidong, Gao Xin. Analysis on the load characteristics and coefficient of friction of angular contact ball bearing at high speed. Tribology International. 2015. Vol. 87. pp. 50–56.
14. Kostetskiy B. I. Friction, lubrication and wear in machines. Kiev : Tekhnika, 1970. 396 p.
15. Danenko V. F., Gurevich L. M., Trykov Yu. P., Volchkov V. M., Nikitin V. A. Simulation of drawing process for bimetallic wire of carbon steel and 12Cr18Ni10Ti stainless steel. Chernye Metally. 2013. No. 10. pp. 43–47.
16. Tomskiy K. O. Increasing of efficiency of operation and wear-resistance of stopping devices using the bimetallic materials : thesis of inauguration of Dissertation … of Candidate of Engineering Sciences. Moscow, 2013. 24 p.
17. Elagina O. Yu., Tomskiy K. O. Development of approach to bimetallic surfaces use in friction knots without lubrication. Trudy Instituta nefti i gaza imeni I. M. Gubkina. 2011. No. 3. pp. 48–50.