Bulat A.F., Dyrda V.I., Pukhalskyi V.M., Kozub Yu.H., Kiriia R.V., Chernii O.A., Ovcharenko Yu.M. Some problems of experimental researches of rubber ladders of heavy mining feeders for release and delivery of uranium ores

Details
Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, № 144

Geoteh. meh. 2019, 144, 62-76

https://doi.org/10.15407/geotm2019.144.062

Some problems of experimental researches of rubber ladders of heavy mining feeders for release and delivery of uranium ores

1Bulat A.F., 1Dyrda V.I., 2Pukhalskyi V.M., 3Kozub Yu.H., 1Kiriia R.V., 1Chernii O.A.,4Ovcharenko Yu.M.

1Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine, 2Western Mining and Processing Plant, 3Luhansk Taras Shevchenko National University, 4Dnipro State Agrarian and Economic University

UDC 678.4.06:621.81

Language: Russian

Abstract.

For the operations of production and delivery of uranium ore with the underground method of extraction, heavy vibrating feeders are used. For their reliable and durable operation within a given lifetime, it is necessary to protect the working body from the effects of adverse factors. The paper discusses the metal and rubber lining of the TVP tray. The analysis of literary sources based on the results of experimental studies of the influence of major factors on the durability of protective linings identified such factors as the hardness of the lining material, lining thickness and impact energy, as well as operating conditions: the presence of a small fraction of rock on the lining surface, the use of an explosion to eliminate hangs and additional crushing oversize. Bench and operational tests of the VPR-5M serial vibration feeder (PVG‑1.0/2.2) with different thickness of the rubber lining of the tray showed that the stresses in the material of the tray decrease with a certain thickness to a certain limit, while the impact energy remains constant, the depth pressing the body into the material of the lining with increasing its thickness increases to a certain limit, after which it remains constant; rubber lining 5-10 times (depending on the elastic modulus of rubber) reduces bending stresses in the material of the vibratory feeder tray when struck by falling pieces of rock mass and 25-30 times reduces stresses in the contact plane, which allows to successfully use rubber lining to protect the working parts vibrating machines; the load on the supports of the vibrating feeder with the rubber lining of the tray decreases by 1.3 – 1.5 times during the impact, and the use of elastic supports reduces the stress in the material of the working member by 1.5 – 2 times; The rubber lining reduces the stresses in the material of the working body of the vibrating feeder 9 times when grinding non-gauge explosives.

To simulate the impact of a piece of rock on the surface of the lining, the Hertz – Dinnik model was used to strike a ball against a plane. The obtained calculated values of the normal stress in the lining material are in good agreement with the experimental data.

The paper provides a method for calculating the parameters of lining by the finite element method (FEM) based on the MIRELA+ program. The results of experimental studies that were carried out on the universal bench FP 100/1 with automatic recording of the “load-strain” curve is presented. The plates of a rubber lining of a vibrating feeder with a plate thickness of 180 mm, a contact diameter of a metal ball of 100 mm, a loading speed (speed of ball approaching the surface of the lining plate) V = 0.2 m/s and a type of rubber – 2959 were examined.

The presented simulation model of impact allowed us to compare studies of impact systems with metal and rubber types of linings.

Considering and analyzing the theoretical and experimental material, the authors presented conclusions on the work done.

Keywords:

uranium ore, mining feeders, protective lining, impact model, finite element method

References:

  1.     1.  Bulat, A.F., Dyrda, V.I., Zvyagilskiy, Ye.L. and Kobets, A.S. (2011-2014), Prikladnayamekhanikauprugo-nasledstvennykhsred [Applied mechanics of elastic-hereditary media], Naukova dumka, Kyiv, Ukraine.
  2.     1.  Naduty, V.P., Sukharev, V.V. and Belyushin, D.V. (2012), “Investigation of the strained state of the working body of a vibratory machine with a protective layer under shock loads”, Vibratsіi v tehnіke i technologiyakh, no. 4 (68), pp. 71-75.
  3.     2.  Naduty, V.P., Sukharev, V.V. and Belyushin, D.V. (2013), “Approximation of the results of experimental studies of the shock interaction of the rock mass with the working surfaces of vibratory machines”, Vibratsіi v tehnіke i technologiyakh, no. 1, pp. 43-50.
  4.     3.  Naduty, V.P., Sukharev, V.V. and Belyushin, D.V. (2013), “Study of the influence of the effect of volumetric compression in determining the parameters of protective coatings of elastomers”, Geo-Technical Mechanics, no. 109, pp. 64-72.
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  6.     5.  Dinnik, A.N. (1952), Izbrannyye trudy [Selected Works], Publishing House of the Academy of Sciences of the Ukrainian SSR, vol. 1, Kyiv, USSR.
  7.     6.  Chizhik, Ye.F. (1977), “Research and design of rubber lining for ore grinding mills”, Abstract of Ph. D. dissertation, Mining machines, Dnepropetrovsk, USSR.
  8.     7.  Kirichevsky, V.V., Dokhnyak, B.M., Kozub, Yu.G., Gomenyuk, S.I., Kirichevsky, R.V. and Grebenyuk, S.N. (2005), Metod konechnykh elementov v vychislitel’nom komplekse “MIRELA+” [The finite element method in the computer complex MIRELA+], Naukova dumka, Kyiv, Ukraine.
  9.     8.  Bulat, A.F., Dyrda, V.I. and Zvyagilskiy, Ye.L. (2016), Elastomery v gornom dele [Elastomers in mining], Naukova dumka, Kyiv, Ukraine.
  10.     9.  Dyrda, V.I. and Naduty, V.P., “Investigation of the effect of rubber lining on the dynamics of vibratory feeders under shock loads”, № 1975 DEP.

About the authors:

Bulat Anatolii Fedorovych, Academician of the National Academy of Science of Ukraine, Doctor of Technical Sciences (D. Sc.), Professor, Director of the Institute, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Dyrda Vitalii Illarionovych, Doctor of Technical Sciences (D. Sc.), Professor, Head of Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Pukhalskyi Viktor Mykolaiovych, Candidate of Technical Sciences (Ph. D.), Chief Engineer in Eastern Mining and Processing Plant, JeltyeVody, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kozub Yurii Hordiiovych, Candidate of Technical Science (Ph. D.), Head of the Department of Physical-Technical Systems and Informatics, Lugansk Taras Shevchenko National University, Starobilsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kiriia Ruslan Vissarionovich, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Geomechanics of Mineral Opencast Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM, NASU), Dnipo, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Chernii Oleksandr Anatoliiovych, Doctoral Student in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ovcharenko Yurii Mykolaiovych, Candidate of Technical Science (Ph. D.), Associate Professor, Department of reliability and repair of machinery, Dnipro State Agrarian Economic University (DSAEU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.