TO THE QUESTION OF ENERGY INTERRELATION OF PROCESSES OF TRANSPORTATION OF ROCK MASS AND DESTRUCTION OF BEARING METAL STRUCTURES OF REAR BRIDGES OF BELAZ DUMP TRUCKS

Author(s):  
I. V. Kuznetsov ◽  
I. A. Panachev ◽  
I. V. Zyryanov
2019 ◽  
Vol 105 ◽  
pp. 03005
Author(s):  
Michael Drygin ◽  
Nikolai Kuryshkin

Supporting metal structures of large dump trucks at open cast coal mines function under exposure to alternating cyclic load. Fatigue cracks that appear there require timely maintenance welding. Organization of repair processes is multivariant; it can be performed either by the enterprise (open cast coal mine) efforts or by special repair units. An industrial experiment carried out at Permyakovskiy and Prokopyevskiy open cast coal mines in Kuzbass has shown that type of large dump trucks’ repair works organization influences significantly process efficiency. Repair welding by enterprise efforts is the most non-productive compared to other types of repair process organization. Its specific rate is 37 per cent lower than in comparison with unstructured welding and 2.2 times lower in comparison with structured metal sheet replacement and structured welding. Structuring repair processes allows to increase their efficiency by 30...40 per cent on average. Structured replacement of the spring plate is the most productive type of metal structure repair process organization. Comparison of maintenance measurement results in accordance with Unified Norms and Prices collected book with the results obtained from the industrial experiment showed that calculation methods give underestimated values of repair processes’ specific rate.


2021 ◽  
Vol 21 (3) ◽  
pp. 144-150
Author(s):  
Mark L. Khazin

Since the beginning of the civilization emergence, people began to use the minerals extraction on the surface of the Earth and the rock mass transportation. One of the main tasks of the mining industry is the transportation of an increasing rock mass amount from the quarry, which has caused the need to increase the power and carrying capacity of mining dump trucks. Today, we can assume that the revolutionary period of increasing the carrying capacity in the creation of heavy-duty dump trucks is over. Further improvement of the designs of frame dump trucks is impractical. To create super-powerful dump trucks capable of efficiently transporting rock mass from deep horizons, fundamentally different designs of machines and power plants are needed. The most important requirement for promising machines is to minimize the negative impact on the environment. In its development, mining vehicles have come a long way: a hand wheelbarrow - a horse cart - a truck - a diesel mining dump truck - a diesel-electric mining dump truck - an electric mining dump truck - an unmanned electric mining dump truck. According to the law of the transition from quantity to quality, it can be assumed that the period of increasing the carrying capacity of mining dump trucks has ended (quantitative changes), and a new period of qualitative changes begins (the development of new types of mining transport, an increase in the specific capacity of a power plant, the use of other energy carriers, etc.). An important area is the use of artificial intelligence: robotic dump trucks, self-diagnostic systems, etc. The main requirement for promising machines is to reduce the cost of transporting rock mass and a minimum negative impact on the environment.


Author(s):  
S.V. KOVSHOV ◽  
◽  
A.V. PASYNKOV ◽  

The issues of dust formation and dust suppression in quarries during transportation of rock mass are considered. Foreign and Russian techniques and methods of dust control in open pit mine are analyzed. The limit number of equipment units for the Noyon-Tologoi opencast mine is established, and the dependence of the gross emission of inorganic dust on the number of dump trucks is determined. As a result of a comprehensive analysis, dust suppression methods for a polymetallic open pit mine are proposed.


2020 ◽  
Vol 174 ◽  
pp. 03020
Author(s):  
Andrey Pokatilov ◽  
Anastasia Shirokolobova ◽  
Roman Dobrynin ◽  
Andrey Vinidiktov

The results of crack formation monitoring in metal structures of BelAZ heavy dump trucks during their operation at Kuzbass open-casts are given in the article. Possible causes and areas of the crack-like defects formation during operation of heave dump trucks at depths greater than 300 m are considered. The assembly units and elements of heave dump trucks and the areas of the highest total stresses are determined by solid modeling, strength analysis and monitoring of the condition of metal structures under production conditions. The law of crack length development in the areas of the transaxle-housing component and the fastening of the hydraulic cylinder depending on the number of loading cycles is established. The stresses dependence arising in the structural elements of heavy dump trucks during operation under various loads, on the number of loading cycles to failure, is presented.


2020 ◽  
Vol 241 ◽  
pp. 10
Author(s):  
V. Kurganov ◽  
M. Gryaznov ◽  
S. Kolobanov

The method proposed in the article is based on the mathematical apparatus for quantitative assessment of the reliability of majority schemes of structural redundancy of transport processes, which provide the availability and usage of several backup delivery channels in the transport process in case of any malfunction. The principle of multi-channel haulage is commonly used in quarries for transportation of overburden and minerals from benches by dump trucks, when excavators and dump trucks performing cyclic operations function as a single excavator-dump truck complex. This pattern of work significantly increases the likelihood of fulfilling the daily plan for transporting rock mass due to the redistribution of dump trucks between mining and overburden excavators in the event of failure of one or more units of mining and handling equipment.The reliability of excavator-dump truck complexes is assessed in three stages: initial data collection for mathematical modeling of excavator-dump truck complex performance; solving the problem of optimizing the distribution of dump trucks between excavators, ensuring maximum productivity of the excavator-dump truck complex; assessment of the reliability of its work depending on the probability of fulfilling the daily plan for the transportation of rock mass.The proposed method is implemented as part of a computer program and makes it possible to automate the operational management of the process of transporting rock mass in a quarry using a mobile application. The developed guidelines can be used for any quarries with automobile transport, regardless of the type of mineral extracted, the mining method, the loading pattern, the capacity of the excavation and loading equipment fleet, and the capacity of operated dump trucks.  


2021 ◽  
Vol 4 (1) ◽  
pp. 258-267
Author(s):  
S.А. Bublik ◽  
◽  
A.V. Zaitsev ◽  
I.N. Shardakov ◽  
M.A. Semin ◽  
...  

Study of the deformation of the foundation and elements of the underground part of the skip shaft during the manufacture of forward concrete lining has been carried out. As part of the study, a thermomechanical model of the «rock mass — shaft support» system was de-veloped. Further, on the basis of the obtained results of mathematical modeling, the main fac-tors determining the deformation processes in the lining of the skip shaft are established. The results of the study were further used to develop an automated system of deformation monitor-ing of construction elements of mine surface building.


2020 ◽  
Vol 174 ◽  
pp. 03021
Author(s):  
Ilya Kuznetsov ◽  
Ivan Panachev ◽  
Igor Zyryanov ◽  
Georgiy Shirokolobov

The paper presents analytical formulae of the transportation en- ergy of blasted rock mass depending on the route slopes. The figures are obtained for mining dump trucks with a carrying capacity of up to 55 tons, from 55 to 130 tons and from 130 to 320 tons. In addition, analytical for- mulae are presented for the total destructive energy of the structural section elements of dump trucks depending on the longitudinal slope of the route. The work uses the parameters of crack-like defects that are formed on the rear axle housing component of BelAZ heavy dump trucks. The energy de- pendences of the transportation and destruction processes for mining trucks of various carrying capacities are given. An energy joint diagram has also been constructed, which allows determining the maximum allowable val- ues of the transportation energy of the rock mass and the destruction of the structural section elements for given route slopes.


2021 ◽  
Vol 304 ◽  
pp. 02002
Author(s):  
Vokhid Kadirov ◽  
Sherzod Karimov ◽  
Uchqun Qushshayev ◽  
Durdona Sharapova

The article presents a study and analysis of the causes of deformation of the slopes and sides of the quarry indicates that the magnitude and nature of the deformation processes depend on the height of the ledge, the angle of slope of the slopes, the physical and mechanical properties, the lithological and structural features of the instrument array and the geodynamic activity of the fault zones. The influence of the deformation zones of the sides of the quarry on the transport of rock masses is justified. The zone of deformed masses of the ore deposit, which affect the movement of the rock mass, is studied. Each process performed in open pit mining is linked to another workflow. Without ensuring the safety of mining operations and performing the tasks set is impossible. Transportation of rock masses in the lower horizons of a deep quarry is one of the main tasks of the industry. At the same time, the removal of deformation and landslides in the area where the transport berm is being constructed for draining and continuous transportation is the main goal of the quarry. The stability of the transport berm depends directly on the stability of the side of the quarry. It is determined that the choice of a single-lane or twolane transport berm constructed for heavy-duty quarry dump trucks depends on the condition of the side of the quarry.


2019 ◽  
Vol 105 ◽  
pp. 03009
Author(s):  
Michail Dadonov ◽  
Alexander Kulpin ◽  
Oleg Ostanin ◽  
Erkin Suleimenov

Vehicle costs for rock mass transportation are more than 50% of total costs, among which 25 — 30% are tire costs. The average tire life in mining enterprises is lower than that the value recommended by production plants. The tire life of open-pit dump trucks is more dependent on the normal load on the wheel. The main factor in the change of the normal load is location of the wheel on the dump truck and the open-pit road’s section. Determination of the maximum loaded tire in different operating conditions will allow increasing the tire life and preventing its premature failure. The TKPH index (tire performance) recommended by tire manufacturers does not take into account the diversity of mining conditions and variations of sections of open-pit roads on different routes. The average load per trip is defined as movement of a loaded open-pit truck and an empty open-pit truck on a straight reach of a road. The proposed method for recording of redistribution of the load on the wheel allows making adjustments to recording of TKPH indexes and thereby effectively managing the tire life, which in turn will make it possible to more fully use the tire life, increase its reliability and reduce the cost of rock mass transportation.


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