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Denis A. Zadkov
Denis A. Zadkov
Associate Professor, Ph.D.
Saint Petersburg Mining University
Associate Professor, Ph.D.
Saint Petersburg Mining University

Articles

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-12-19
  • Date accepted
    2022-07-21
  • Online publication date
    2022-10-18
  • Date published
    2022-11-10

Increasing the content of coarse fractions in the mined coal mass by a combine using paired cuts

Article preview

The main volume of coal is mined underground using shearers. In modern shearers, auger actuators are mainly used, which are distinguished by the simplicity of design, manufacturability and reliability. However, in the process of separating coal from mass by cutting, the yield of fine grades is 40-50 % of the total production volume. Therefore, the search and development of technical solutions that provide an increase in the yield of large fractions in the process of coal mining with auger shearers is an urgent task. Traditionally, this problem is solved by increasing the thickness of the slices, which is achieved by installing cutters with a larger radial reach and increasing the shearer feed rate. An unconventional way to increase the cross section of slices by forming energy-efficient paired and group slices with mutual superposition of stress fields in the mass from the action of neighboring cutters is considered. The results of modeling the process of cutting coal confirm that an increase in the efficiency of destruction of the rock mass by the cutters of the auger executive bodies of the shearer can be achieved by a complex technical solution, including the formation of paired cuts and combined stress zones in the rock mass. As a result, the output of large fragments when cutting with paired cutters increases by 1.3-1.8 times compared with cutting with a single cutter.

How to cite: Gabov V.V., Xuan N.V., Zadkov D.A., Tho T.D. Increasing the content of coarse fractions in the mined coal mass by a combine using paired cuts // Journal of Mining Institute. 2022. Vol. 257. p. 764-770. DOI: 10.31897/PMI.2022.66
Mining
  • Date submitted
    2018-11-05
  • Date accepted
    2019-01-01
  • Date published
    2019-04-25

Features of elementary burst formation during cutting coals and isotropic materials with reference cutting tool of mining machines

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The paper considers the cutting of brittle coals and rocks by a single cutter of a mining machine, in contrast to the generally accepted integral approach, different from the standpoint of the formation of successive elementary bursts that make up the cut. The process of the formation of an elementary bust in time is viewed as successive phases. Due to the complexity and multi-factor nature of the process, preference is given to experimental bench studies using reference cutters, isotropic materials, and real rock blocks. The bursting parameters values greatly influence the time of static forces action, the peculiarities of the formation of stress fields in the undercutter zone of the rock mass and the conditions for the emergence and development of main cracks in the near-cut zones during the cutting process. The accepted phase-energy method of analyzing the process, which most closely matches the structure of the studied process, revealed a more significant, than previously expected, effect on the cutting process, variability of cutting speed and potential energy reserve in the cutter drive. The paper discusses the possibility of purposeful formation of the parameters of elementary bursts. It describes new ways to improve the efficiency of cutting coal and rocks, in particular, reducing the maximum loads and specific energy consumption. It also considers the possibility of reducing the grinding of the rock mass and dust formation.

How to cite: Gabov V.V., Zadkov D.A., Nguyen K.L. Features of elementary burst formation during cutting coals and isotropic materials with reference cutting tool of mining machines // Journal of Mining Institute. 2019. Vol. 236. p. 153. DOI: 10.31897/PMI.2019.2.153
Technological machinery and equipment of mining and oil & gas industries
  • Date submitted
    2007-11-18
  • Date accepted
    2008-01-05
  • Date published
    2008-05-01

Determination of operation modes of step mine drainage systems without intermediate water collectors

Article preview

For determination state of working ступенчатых mining водоотливных of the installation without intermediate водосборников follows to define the режимные parameters last step and use their as input at calculation previous step. For ensuring given state of working whole installation necessary to change the features a pipe line or pump.

How to cite: Kabanov O.V., Zadkov D.A., Kabanov S.O. Determination of operation modes of step mine drainage systems without intermediate water collectors // Journal of Mining Institute. 2008. Vol. 178. p. 47-50.
Diagnostics and control of technical systems and their elements. New technologie
  • Date submitted
    2007-11-04
  • Date accepted
    2008-01-06
  • Date published
    2008-05-01

Improvement of heat treatment regimes of cutters of road-headers for increase of their wear resistance

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The method is offered which allows to increase the wear resistance of bit bodies for continuous miners by means of their additional full hardening. This results in increasing the bit body hardness from 37-42 HRC up to 49-51 HRC, which must bring to increasing in wear resistance approximately of 25 %. The suggestion has been tested with a batch of bits spec. RKS-2 (РКС-2) in the mines of Vorkuta and have demonstrated an increasing in wear resistance compared with that of the bits which had not been exposed to an additional hardening.

How to cite: Bolobov V.I., Gabov V.V., Zadkov D.A., Tetervak A.V. Improvement of heat treatment regimes of cutters of road-headers for increase of their wear resistance // Journal of Mining Institute. 2008. Vol. 178. p. 170-172.
Mining electromechanics
  • Date submitted
    2001-09-24
  • Date accepted
    2001-10-17
  • Date published
    2002-04-01

Impact of drive properties on excavation machine loads

Article preview

The impact of drive properties on excavation machine loads is analyzed in order to find the most effective way to separate the coal from the massif. Disadvantages of traditional excavation machines with rotary actuator are revealed. The purpose of the research is to determine the nature of changes in forces and cutting speed when changing the properties of the drive. On the basis of kinetic theory of brittle massifs fracture the hypothesis about the possibility of changing the nature of the cutting process by changing the properties of the drive is put forward. A physical model for experimental research is proposed and the first results of the experiments are presented.

How to cite: Zadkov D.A. Impact of drive properties on excavation machine loads // Journal of Mining Institute. 2002. Vol. 152. p. 166-168.