Specifics of Rock Excavation Process Using Open-Pit Excavator

2021 ◽  
pp. 787-794
Author(s):  
O. Lukashuk ◽  
K. Letnev ◽  
A. Komissarov
Keyword(s):  
Open Pit ◽  
Rock Excavation ◽  
Excavation Process

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 Vibration analysis of a bucket wheel excavator boom using rayleigh’s damping model

2019 ◽  
Vol 2 (1) ◽  
pp. 233-241
Author(s):  
Florin Dumitru Popescu ◽  
Sorin Mihai Radu ◽  
Krzysztof Kotwica ◽  
Andrei Andraș ◽  
Ildiko Kertesz Brînaș ◽  
...  
Keyword(s):  
Time History ◽  
Time Response ◽  
Open Pit ◽  
Response Analysis ◽  
Damping Matrix ◽  
Stiffness Matrices ◽  
Excavation Process ◽  
History Analysis ◽  
Time Response Analysis ◽  
Dynamic Time

Abstract For the ERc 1400-30/7 type bucket wheel excavator (BWE) used in various Romanian open pit mines, a virtual model of the boom was constructed in SolidWorks. On this model, the variable in time forces acting during the excavation process were simulated, and the time history analysis (time response) was performed. This dynamic time response analysis was performed for excavation of homogenous material only, considering the damping as being of Rayleigh’s type, where the damping matrix is a linear combination of the mass and stiffness matrices. Based on the conducted analysis, the displacements of the boom during excavation were observed.

scholarly journals Precision Rock Excavation: Beyond Controlled Blasting and Line Drilling

2021 ◽  
Author(s):  
Marilena Cardu ◽  
Simone Saltarin ◽  
Carmine Todaro ◽  
Chiara Deangeli
Keyword(s):  
Specific Energy ◽  
Daily Practice ◽  
Open Pit ◽  
Rock Excavation ◽  
Rock Breakage ◽  
Blast Parameters ◽  
Final Profile

The strictness of the result of an excavation, whether mechanical or by means of explosives, is naturally conditioned by the objective, and therefore by the type of technique applied to achieve it. To attain the best results in terms of rock breakage and respect of the final profile, it’s important to evaluate the excavation specific energy and its optimization. This research focuses on evaluating the effects of different techniques on the quality of final walls in open-pit and underground operations. Different geometries and configurations can be applied to both quarrying and tunnelling blasts. The research is aimed to push contour blasts to their limits, and the main aspects are discussed in order to improve the blast parameters in the daily practice.

scholarly journals Equipment selection based on two different fuzzy multi criteria decision making methods: Fuzzy TOPSIS and fuzzy VIKOR

2018 ◽  
Vol 10 (1) ◽  
pp. 661-677 ◽  
Author(s):  
Serafettin Alpay ◽  
Melih Iphar
Keyword(s):  
Decision Making ◽  
Fuzzy Topsis ◽  
Open Pit ◽  
Multi Criteria Decision Making ◽  
Rock Excavation ◽  
Open Pit Mines ◽  
Fuzzy Vikor ◽  
Project Costs ◽  
Technical Specifications ◽  
Past Experiences

AbstractDeciding on equipment from a set of feasible alternatives for excavation purpose in open pit mines is a critical task for the engineers and contractors since it considerably affects the project costs and productivity. Alternatives of rock excavation equipment, which are deemed suitable for the diggability of rock units in open pits, can have many technical specifications or factors that should be considered simultaneously. It can be successfully selected in a scientific way by employing multi-criteria decision making methods by means of taking the advantage of engineering knowledge, intuition and past experiences. In this study, we select the most convenient hydraulic excavator for a magnesite mine by fuzzy multi criteria decision making methods: fuzzy TOPSIS and fuzzy VIKOR. The fuzzy approach allows the experienced engineers to compare the multiple criteria (technical factors) and the possible alternatives of rock excavation machines by simply using linguistic expressions in their natural language.

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