scholarly journals Determining operation parameters of the leverage mechanism in a mining excavator

2021 ◽  
Vol 1 ◽  
pp. 94-102
Author(s):  
Olga A. Lukashuk ◽  
◽  
Konstantin Iu. Letnev ◽  
Keyword(s):  
Kinematic Chain ◽  
Open Pit ◽  
Rock Excavation ◽  
Operational Parameters ◽  
Working Process ◽  
Equipment Operation ◽  
Excavation Process ◽  
Work Area ◽  
Operation Parameters ◽  
Optimizing Algorithm

Introduction. The paper analyzes the process of rock excavation using a front-shovel operational equipment of an open-pit excavator in the context of determining rational modes of operation for its main mechanisms (lifting and thrusting mechanisms) during the excavation. The main purpose of the study is to establish the kinematic and dynamic characteristics of the excavation process by identifying patterns of changes in the operating parameters of the main mechanisms. Research methodology includes mathematical modelling and computational experiment with the use of machines and mechanisms theory methods. Results. Dependencies were obtained to determine rational values of lifting and thrusting velocities which ensure that the bucket (top of its cutting edge) moves along a specified trajectory while excavating. A simulation model was built for the process of rock excavation carried out by front-shovel excavators, which represents a set of calculated values for the operational parameters of the main mechanisms to realize the bucket movement along a specified path and provide specified energy-force parameters on the bucket. An optimizing algorithm was developed to control the working process of an open-pit excavator and achieve required values of the operation parameters to get the bucket moving at a specified excavating velocity within the work area of the excavator. It is shown that their joint action forms a kinematic chain which connects the main mechanisms and the bucket and includes driven links of those mechanisms and elements of the operational equipment. Operation parameters of the main mechanisms were found to be formed in accordance with kinematic properties of the transmission mechanism (with the kinematic chain as its part). Scope of results. The results of the research could be used to develop a control system for the drives of the main mechanisms.

scholarly journals Efficiency increase in excavation control as primary reserve of performance increase for open-pit excavators

2018 ◽  
Vol 224 ◽  
pp. 02028
Author(s):  
Olga Lukashuk ◽  
Konstantin Letnev ◽  
Anatoliy Komissarov
Keyword(s):  
Rock Mass ◽  
Transfer Functions ◽  
Open Pit ◽  
Work Area ◽  
Efficiency Increase ◽  
Operation Parameters ◽  
Primary Reserve

It is shown that controlling excavation of rock mass using an open-pit excavator with a front shovel as its operational equipment is quite a difficult task due to the complexity of control under almost nonstop adjustment of velocities of working motions (hoisting and thrusting). It was established that operation parameters of the main mechanisms depend on the type of path of motion and position of the bucket in the excavator’s work area. The process of excavation was algorithmically described, and kinematic transfer functions for the operational equipment mechanism were determined, characterizing correlations between the velocity of excavation and the velocities of working motions.

scholarly journals Incorporation of Geometallurgical Attributes and Geological Uncertainty into Long-Term Open-Pit Mine Planning

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 108 ◽  
Author(s):  
Nelson Morales ◽  
Sebastián Seguel ◽  
Alejandro Cáceres ◽  
Enrique Jélvez ◽  
Maximiliano Alarcón
Keyword(s):  
Production Scheduling ◽  
Programming Model ◽  
Mineral Resources ◽  
Mineral Deposit ◽  
Open Pit Mine ◽  
Mine Planning ◽  
Open Pit ◽  
Operational Parameters ◽  
Financial Outcomes

Long-term open-pit mine planning is a critical stage of a mining project that seeks to establish the best strategy for extracting mineral resources, based on the assumption of several economic, geological and operational parameters. Conventionally, during this process it is common to use deterministic resource models to estimate in situ ore grades and to assume average values for geometallurgical variables. These assumptions cause risks that may negatively impact on the planned production and finally on the project value. This paper addresses the long-term planning of an open-pit mine considering (i) the incorporation of geometallurgical models given by equiprobable scenarios that allow for the assessing of the spatial variability and the uncertainty of the mineral deposit, and (ii) the use of stochastic integer programming model for risk analysis in direct block scheduling, considering the scenarios simultaneously. The methodology comprises two stages: pit optimization to generate initial ultimate pit limit per scenario and then to define a single ultimate pit based on reliability, and stochastic life-of-mine production scheduling to define block extraction sequences within the reliability ultimate pit to maximize the expected discounted value and minimize the total cost of production objective deviations. To evaluate the effect of the geometallurgical information, both stages consider different optimization strategies that depend on the economic model to be used and the type of processing constraints established in the scheduling. The results show that geometallurgical data with their associated uncertainties can change the decisions regarding pit limits and production schedule and, consequently, to impact the financial outcomes.

Research and Application on Fault Diagnosis for Steam Turbine Using Multi-Parameter Fusion

2014 ◽  
Vol 543-547 ◽  
pp. 1068-1073
Author(s):  
Xiao Wen Deng ◽  
Zhen Yu Zhou ◽  
Lei Song ◽  
Peng Li ◽  
Yu Jiong Gu
Keyword(s):  
Fault Diagnosis ◽  
Steam Turbine ◽  
Comprehensive Evaluation ◽  
Mechanical Equipment ◽  
Operational Parameters ◽  
Multiple Parameters ◽  
Equipment Operation ◽  
State Evaluation ◽  
Fault Mode ◽  
Vibration Parameters

For the running situation of supercritical and ultra-supercritical steam turbine unit, a fault diagnosis method of steam turbine based on multiple parameters fusion is proposed. The association of the fault mode with the vibration parameters, the thermodynamic parameters and the operational parameters is built, according to fault development mechanism, equipment operation data and professional experience. The overall state evaluation of mechanical equipment is given, the reliability of fault diagnosis is improved, and the need of the steam turbine fault diagnosis is met, by means of comprehensive evaluation of multiple parameters. Example applications verify this method.

scholarly journals MINING AND CONVEYOR EQUIPMENT OPERATION ORGANIZATION IMPROVEMENT IN “SBU-COAL”, HOLDING COMPANY OJSC OPEN-PIT MINING ENTERPRISES

Ugol ◽  
2016 ◽  
pp. 14-19
Author(s):  
L.V. Rybak ◽  
◽  
Yu.S. Deryabin ◽  
S.V. Burtsev ◽  
V.E. Stihurov ◽  
...  
Keyword(s):  
Open Pit ◽  
Open Pit Mining ◽  
Equipment Operation ◽  
Holding Company

scholarly journals The Condition of Photovoltaic Modules under Random Operation Parameters

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8358
Author(s):  
Grzegorz Trzmiel ◽  
Jaroslaw Jajczyk ◽  
Ewa Kardas-Cinal ◽  
Norbert Chamier-Gliszczynski ◽  
Waldemar Wozniak ◽  
...  
Keyword(s):  
Working Conditions ◽  
Original Method ◽  
Diagnostic Information ◽  
Photovoltaic Module ◽  
Operational Parameters ◽  
Efficient Tool ◽  
Residual Method ◽  
Photovoltaic Modules ◽  
Pv Modules ◽  
Operation Parameters

The paper presents an original method underlying an efficient tool for assessing the condition of photovoltaic (PV) modules, in particular, those made of amorphous cells. Significantly random changes in operational parameters characterize amorphous cell operation and cause them to be challenging to test, especially in working conditions. To develop the method, the authors modified the residual method with incorporated histograms. The proposed method has been verified through experiments that show the usefulness of the proposed approach. It significantly minimizes the risk of false diagnostic information in assessing the condition of photovoltaic modules. Based on the proposed methods, the inference results confirm the effectiveness of the concept for evaluating the degree of failure of the photovoltaic module described in the paper.

scholarly journals Road longitudinal slope influence on the efficiency of excavator-automobile complexes usage

2021 ◽  
Vol 315 ◽  
pp. 01022
Author(s):  
Andrey Kudrevatykh ◽  
Andrey Furman ◽  
Andrey Ashcheulov
Keyword(s):  
Road Transport ◽  
Coal Industry ◽  
Open Pit ◽  
Open Pit Mining ◽  
Production Scale ◽  
Equipment Operation ◽  
Mining Conditions ◽  
Problematic Issue ◽  
Longitudinal Slope ◽  
Pit Depth

At present, the country's coal industry pays special attention to the open-pit mining, because of its higher efficiency and profitability. According to various surveys, currently the share of open-pit mining is 50 - 65%, and it will increase to 80 - 85% in the future. The development of an open-pit mining is accompanied by production scale increase, open pits depth increases and complexity of mining conditions of main technological equipment operation increases. With the increase of open pits depth, technological road transport becomes the most problematic issue in mining, since open-pit depth enlargement increases the distance of transportation and roads longitudinal slopes and these factors reduce the efficiency of excavator-automobile complexes.

On determining the parameters of face blocks during mining operations with backhoes

2022 ◽  
pp. 76-81
Author(s):  
O.I. Litvin ◽  
Ya.O. Litvin ◽  
M.A. Tyulenev ◽  
S.O. Markov
Keyword(s):  
Open Pit ◽  
Open Pit Mining ◽  
Kuznetsk Coal ◽  
Coal Basin ◽  
Mining Operations ◽  
Kuznetsk Coal Basin ◽  
Equipment Operation ◽  
Mining Companies ◽  
The Face ◽  
The Given

The backhoe hydraulic shovels (backhoes) have been widely used in open-pit mining operations in the Kuznetsk coal basin since the early 2000s. Now their number is growing every year, both because new operations begin on new sites, and because of the backhoe advantages. However, up to now parameters of their operation, more particularly the parameters of the face blocks, are often taken according to the actual data, i.e. based on the accumulated experience of the mining companies, and are not calculated using the approved scientifically validated methods. In the given article the authors give some preconditions for creation of a uniform methodology to calculate parameters of the face blocks depending on mining-geological and miningtechnical conditions. It is noted that the manufacturers of excavation equipment quote the data corresponding to the maximum possible parameters of the equipment operation, in particular the height of the excavated layer, as a result of which it is rather difficult to apply this in practice. Preliminary conclusions about the need to take into account the diversity of the above conditions and their interrelation with the parameters of a particular model of the excavation and loading equipment have been made.

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