V I Knyazkina’s research while affiliated with Saint Petersburg Mining University and other places

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Publications (8)


Improvement of the system of maintenance and repair of mining machines according to the actual state
  • Article

January 2022

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12 Reads

MINING INFORMATIONAL AND ANALYTICAL BULLETIN

V. I. Knyazkina

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Time for troubleshooting individual units and parts.
Comparison of the average planned, actual and achieved time spent on maintenance and repair of the excavator from 1 January to 30 April.
Adapting standard maintenance approaches for mining excavators to actual operating condition
  • Article
  • Full-text available

November 2020

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121 Reads

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1 Citation

IOP Conference Series Materials Science and Engineering

Significant portion of the annual calendar fund-time work of mining excavators spent on maintaining its working condition by carrying out preventive and repair regulatory activities and recovery in the event of emergency failures and maintenance and repair expenses constitute a significant proportion of the cost of excavation of mining rock. To assess the effectiveness of machinery a non-standard indicator, the coefficient of technical readiness, applied which does not have a single assessment methodology. At the present stage of machinery development, existing quarry dispatching systems allow you to allocate any of its elements from the fund-time of mining excavators: productive time, time spent in repair and maintenance and also classify other time costs of a particular machine which allowed an appropriate analysis. Analysis showed that at the current organization of MaR (maintenance and repair) there is significant potential to reduce repair impacts, as well as to ensure a reduction in the cost of routine maintenance, to remove maintenance and repair measures from the category of costly ones, at least for self-sufficiency without compromising the quality of these works and the reliability of the excavator as a whole.

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Figure 1. Analysis of breakdown time of excavators due to failures of elements of the mechanical system.
Figure 2. Failure analysis of bearing assemblies.
Assessment of the state of a lubricator by the size of the acoustic signal in a loaded pair of friction of a mining machine transmission

April 2020

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69 Reads

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4 Citations

Journal of Physics Conference Series

As a result of the studies, the possibility of assessing the state of the working surfaces of mining machines, in particular bearing assemblies as a whole without disassembling the gearbox, is confirmed. An innovative solution in this matter is to ensure the delivery of the lubricator to tribolcoupling through the channels of the lubrication system, according to its state, determined by the size of the acoustic signal of the ultrasonic range in the friction pair.



Figure 1. Bearings failures causes.
Figure 3. Dosing pump gearbox.
Mobile lubrication and filling units to reduce mining machines and equipment downtime when providing maintenance

July 2019

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739 Reads

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5 Citations

IOP Conference Series Materials Science and Engineering

Currently in the mining industry there is an observed increase in demand for portable lubrication and filling units used by technical maintenance and repair of different quarry machinery. These oil-servicing mobile workshops provide the possibility to organize maintenance at facilities, situated far from each other, and quick delivery of everything necessary for technical maintenance and repair at mining machines and equipment operation location.


Figure 1. Value dynamics of index D depending on speed in the contacting pair with the lubricant "Industrial oil I-20". The figure shows a stable existing trend of acoustic emission signal increasing together with the angular speed increase. Herewith the higher the pressure in the contacting pair, the more intensive the increase in index D. It bears evidence about degradation of the contacting pair friction conditions, pressing lubrication out of the contact area and transfer from volumetric friction to dry friction. Figure 2 demonstrates the character of acoustic emission value change described by index D for a sequence of pressure values in a contacting pair by constant angular speeds. Similar to the angular speed parameter influence, the trend reveals that the acoustic emission signal value corresponding to the friction factor should change depending on pressure in the contacting pair. Transfer to the dry friction condition by high speeds happens already according to low pressure values,
About possibility of immediate evaluation of technical condition of mining equipment using signal value of acoustic emission friction

July 2019

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32 Reads

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7 Citations

IOP Conference Series Materials Science and Engineering

An experiment was conducted to confirm the reliability of the evaluation of the technical condition of transmission elements during operation in terms of the magnitude and nature of the acoustic emission signal, while completing the negative effect of the artificial environment on the durability of the transmission elements. Thus, the results of the experiment are presented where the acoustic emission signal in the friction pair was changed depending on the pressure value in the contacting pair and the angular velocity value. The possibility of obtaining an estimate of the technical state of the transmission elements during its operation in terms of acoustic and emission characteristics has been experimentally confirmed.


Citations (4)


... As a result of the conducted research, it is possible to obtain iron-containing products that can become alternative raw materials [43][44][45][46][47]. This corresponds to the Action Plan for the development of the mineral resource base of Russia [48][49][50]. ...

Reference:

Study of the kinetics of the process of producing pellets from red mud in a hydrogen flowИзучение особенностей кинетики процесса получения окатышей из красного шлама в потоке водорода
Assessment of the state of a lubricator by the size of the acoustic signal in a loaded pair of friction of a mining machine transmission

Journal of Physics Conference Series

... Как видно из анализа рис. 1, наиболее критичными являются эргатический, технический и климатический факторы, в сумме составляя 77%, при этом наиболее весомым является эргатический фактор. Вышеуказанные факторы определяют собственно конкретные отказы и возникновение дефектов в системах и оборудовании карьерного экскаватора ЭКГ-18Р/20К [16][17][18][19]. Анализ отказов экскаваторов по основным механизмам и системам представлен на рис. 2. ...

Аssessment of the influence factors on the choice of the maintenance strategy for excavators
  • Citing Article
  • January 2019

MINING INFORMATIONAL AND ANALYTICAL BULLETIN

... Eyre [4] (1978) afirmou que, o desgaste abrasivo encontrado em instalações industriais, correspondem a cerca de 50% dos casos em que há desgaste em equipamentos ou componentes. Nesse sentido, o objetivo da pesquisa é analisar comparativamente a resistência ao desgaste do aço SAE 1020 lubrificado com condicionador de metais e graxa a base de lítio, considerando que, no sistema produtivo de mineração a maioria do maquinário possui condições de operação severas, com altos gradientes de pressão e temperatura, minério em suspensão, umidade, entre outros (Safronchuk [5], 2019). O aço SAE 1020 é o mais utilizados em componentes e sobressalentes por possuir uma ótima relação custo/benefício, mas é necessário que a lubrificação seja realizada de forma adequada para evitar o desgaste prematuro da superfície dos componentes. ...

Mobile lubrication and filling units to reduce mining machines and equipment downtime when providing maintenance

IOP Conference Series Materials Science and Engineering

... Therefore, the acoustic signal excited in the layered coal-rock mass is the superposition of its own (resonant) elastic vibration in each individual layer. In the process of coal mining, the cutting mechanism of the running mining equipment is used as the source of acoustic vibration [20]. Taking the working face as an example, the acoustic vibration excites near the working face, with propagation to the deep coal body and the sound wave passing through the medium with variable parameters. ...

About possibility of immediate evaluation of technical condition of mining equipment using signal value of acoustic emission friction

IOP Conference Series Materials Science and Engineering