Temat: longwall system - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The impact of multiple seam mining exploitations on seismic activity and state of stress
Autorzy:: Majcherczyk, T.
Niedbalski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/178397.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: mining
longwall system
seismic activity
Opis:: The paper presents an analysis of seismic activity for selected areas of hard coal mine executing exploitation in a rock mass with a variable degree of rock disturbance, i.e., also with a varied number of previous mined-out seams. A distribution of vertical stress and a value of vertical stress concentration coefficient were also determined in the strata of immediate roof of the seams planned for mining. In the analyzed case, despite the lack of thick and solid strata of sandstones in the roof, the rock mass emits seismic activity, where the energy largely depends upon an impact of exploitation edges and tectonic disturbance.
Źródło:: Studia Geotechnica et Mechanica; 2017, 39, 1; 53-62
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A data driven decision making approach for long-wall mining production enhancement
Autorzy:: Morshedlou, A.
Dehghani, H.
Hoseinie, S. H.
Powiązania:: https://bibliotekanauki.pl/articles/88911.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: longwall system
reliability
maintenance
production risk
Opis:: Machine failures have destructive effects on continuity of operation and lead to production losses in long-wall mines, making proper maintenance scheduling essential. This paper models the reliability of the whole production chain in an Iranian long-wall mine including the drum shearer, Armored Face Conveyor (AFC), hydraulic powered supports, Beam Stage Loader (BSL), and main conveyer belt. Analyzing the computational results and failure frequencies, we rank the critical components and develop a reliability-based preventive maintenance schedule for all equipment. In respect to the data classification, conveyor belt with failure abundance of 41.5 percent is the most critical, while powered supports with the failure abundance of 1.2 percent shows the best performance. Approximately, the reliability of the production process after four hours reaches nearly to zero. Implementing the schedule, computational results suggest an increase of approximately 67.7 percent in the average production per shift.
Źródło:: Mining Science; 2019, 26; 7-20
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Mechanisation of Longwall Extraction of Hard and Abrasive Rocks
Autorzy:: Bołoz, Ł.
Krauze, K.
Kubín, T.
Powiązania:: https://bibliotekanauki.pl/articles/2064946.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: mechanical ore excavation
longwall system
disc cutting head
Opis:: The article presents the current topic of the possibility of mechanical extraction of hard and abrasive rocks using mechanized wall systems. The problem of extracting ores from thin strata precludes the possibility of further use of current technologies involving a human at the face. Currently, the operation is carried out using explosives in column-pillar systems. In systems with a chamber column, all major processes are mechanized and carried out by self-propelled drilling and bolting machines, loaders as well as hauling and auxiliary trucks. These machines are operated in the workplace by operators. For many years, effective mechanical excavation methods were sought that would allow the development of a mining machine and a mechanised longwall complex. Such a complex is to allow excavation without the presence of humans at the face. The article presents the current technical capabilities, assumptions and requirements for such a solution. Then, an innovative longwall complex equipped with a disc shearer is introduced. The technology of work and achievable productivity are briefly presented. A worn shearer, a face conveyor and a powered support are the subject of AGH inventions.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 331--337
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Zwalczanie zagrożenia klimatycznego w ścianie strugowej na przykładzie ściany D-2 w pokładzie 410 w JSW S.A. KWK „Borynia-Zofiówka-Jastrzębie” Ruch „Zofiówka”
Combating climatic hazard in the plow longwall system on the example of the longwall d-2 in the layer 410 in JSW S.A. the „Borynia-Zofiówka-Jastrzębie” „Zofiówka” fild coal mine
Autorzy:: Szmuk, A.
Powiązania:: https://bibliotekanauki.pl/articles/113179.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: zagrożenie klimatyczne
ściany strugowe
climatic hazard
plow longwall system
Opis:: Tematem artykułu jest prezentacja praktycznych doświadczeń w prowadzeniu ściany silnie zagrożonej klimatycznie, przy eksploatacji cienkiego pokładu węgla ścianowym kompleksem strugowym. Opisano również sposób postępowania służb kopalni, od etapu wykonania prognozy klimatycznej do prezentacji efektów pracy chłodnic powietrza w czasie eksploatacji ściany.
The subject of the article is presentation of practical experiences in conducting a low-thickness caving plow longwall system with high climatic hazard. It also describes the mining staff procedure from the forecast of the climatic hazard to the presentation of work of coolers during exploitation of the longwall.
Źródło:: Systemy Wspomagania w Inżynierii Produkcji; 2018, 7, 1; 197-208
2391-9361
Pojawia się w:: Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Tests of an Innovative Controller Designed to Control the Powered Roof Support
Autorzy:: Szurgacz, D.
Gondek, H.
Powiązania:: https://bibliotekanauki.pl/articles/2064962.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: powered longwall system
powered roof support
control system
working parameters
visualization
Opis:: The article presents the methodology and results of tests of a prototype controller designed for the electrohydraulic control system of a powered roof support. This controller is the basic part of the developed, innovative control system. The tests were carried out on a custom-designed testing station, equipped with one section of a roof support. The aim of the research was to check the functionality and speed of the controller's response while working with the actual support section. The tested controller and the control system has a modular structure, which greatly facilitates its operation and use. Measurements of control functions were carried out on the controller connected to the electrohydraulic control block. The research mainly focused on determining the period starting from the moment of providing the signal to the moment of switching on the basic functions performed by the support section. The obtained results confirm the assumptions made. The controller's operation is very stable, and its response times are very short. It can therefore be assumed that the tested controller is correctly designed and constructed. This creates great possibilities for its practical application in the built-in system for controlling the roof support. This may be particularly important in the case of high-efficiency longwall complexes, for which wireless control of the support is planned to be used. The presented research methodology and obtained results should therefore be an important source of information in the field of testing controllers for powered roof supports.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 223--231
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Innovative Visualization System Designed to Monitor Parameters of Mining Systems Operation
Autorzy:: Szurgacz, D.
Brodny, J.
Powiązania:: https://bibliotekanauki.pl/articles/2065026.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: powered longwall system
powered roof support
control system
working parameters visualization
Opis:: Mining machines suitable for hard coal mining, due to the specifics of this industry must be characterized by very high technical parameters. In particular, it concerns their durability, reliability and availability. Currently used machines approved for operation in underground conditions meet such requirements. Nevertheless, during their operation it is reasonable to conduct supervision and control of work parameters. This applies to both machine manufacturers and users, which is especially important in the event of a failure. Mine employees should be able control of the entire operation process. This control can be effective thanks to a visualization system developed to monitor the working parameters of mining systems. The paper discusses the innovative system and presents the results of efficiency tests. They concerned the visualization of the operation of a powered roof support. The obtained results indicate that the assumed goal of the system has been achieved. The system is built on elements of industrial automation, which guarantees the reliability of the indicated values. Its graphic layout and selection of the presented parameters are also approved. It should also be emphasized that the system can work with currently operating systems and is easy to expand. According to the Authors, the system should find a wide application in practice.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 361--368
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Kombajnowy system ścianowy jako efektywna alternatywa dla strugów węglowych
Low shearer longwall system as an effective option to plough systems
Autorzy:: Korski, J.
Bednarz, R.
Powiązania:: https://bibliotekanauki.pl/articles/187064.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:: kombajnowy system ścianowy
strugi węglowe
low shearer longwall system
plough systems
Opis:: W artykule przedstawiono proces projektowania zmechanizowanego kombajnowego systemu wybierania zaprojektowanego do wybierania cienkich (1,0-1,5 m) pokładów węgla. Nowe podejście do projektowania systemu wybierania z uwzględnieniem uwarunkowań istniejącego systemu technicznego podziemnej kopalni węgla kamiennego i przewidywanych warunków górniczo-geologicznych pozwoliło na skonstruowanie i wdrożenie zmechanizowanego kompleksu ścianowego zdolnego do efektywnego wybierania ściany niskiej, co dotychczas wskazywano jako domenę techniki strugowej. Dokonując porównania wyników produkcyjnych i nakładów, zwrócono uwagę na przyczyny różnic wyników, zwłaszcza w kopalniach Górnośląskiego Zagłębia Węglowego, na korzyść niskiego kombajnowego kompleksu ścianowego. Pozornie niewielka innowacja polegająca na zmianie urządzenia urabiającego wymaga, jak wynika z zawartej w artykule analizy, uwzględnienia poważnych zmian w projektowaniu systemu technicznego dla ściany strugowej i znacząco wyższych nakładów dla uzyskania wyników porównywalnych lub niższych niż przy użyciu odpowiednio dobranego kompleksu kombajnowego.
New approach to fully mechanized low longwall system (1.0-1.5 m) is presented in the paper. More than 30% of coal resources in the world are in thin seams, but their part in extraction is significantly less. There are many reasons. Designers look for effective low longwall system by using a scientific approach to the subject — Nadler's Method. New, innovative solutions brought as a result the low longwall system FL 10/15 (FL 12/18). In Upper Silesia Basin conditions shearer system won competition versus plough system regarding output and investment costs.
Źródło:: Mechanizacja i Automatyzacja Górnictwa; 2012, R. 50, nr 9, 9; 31-38
0208-7448
Pojawia się w:: Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Influence of the Permeability of the Longwall Goaf Zones on the Location of an Area With Explosive Methane Concentration Levels
Autorzy:: Tutak, Magdalena
Palka, Dorota
Powiązania:: https://bibliotekanauki.pl/articles/2064793.pdf
Data publikacji:: 2020
Wydawca:: STE GROUP
Tematy:: methane hazards
longwall
mining operation
longwall ventilation system
goaf
CFD
Opis:: One of the basic ventilation hazards and, at the same time most dangerous, in hard coal mines is the methane hazard. During the exploitation process using the longwall system with the breaking down of roof rocks, methane is released into mining excavations from both mined coal and the one left in goaves. Significant amounts of methane also flow from the underworked and overworked seams, through cracks and fissures formed in the rock mass. When accumulated at an explosive concentration level in goves and at an appropriate oxygen concentration level and the occurrence of a trigger (e.g. a spark or endogenous fire), methane may either explode or ignite. These are immensely dangerous phenomena. Therefore, the possibility of their occurrence should be limited. The article presents the results of the research aimed at determining the impact of the permeability of goaf zones on the distribution of methane and oxygen concentration levels in these goaves. The study was carried out for the longwall ventilated with the Y system. The model analysis was conducted, the results of which allowed the authors to determine these distributions. On their basis, both the location and size of the areas in which hazardous methane concentrations could occur were designated. The results are of great practical importance as they indicate areas in goaves where preventive measures should be implemented.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 238--247
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of the Volumetric Expenditure of Air Supplied to the Longwall Through the “Y” Ventilation System on the Location of an Area at the Risk of an Endogenic Fire
Autorzy:: Tutak, Magdalena
Powiązania:: https://bibliotekanauki.pl/articles/2064902.pdf
Data publikacji:: 2020
Wydawca:: STE GROUP
Tematy:: endogenous fire
mining operation
longwall ventilation system
goaf
Opis:: In the case of longwall ventilation, in the underground hard coal mines, a phenomenon related to the migration of a certain amount of the air stream supplied to the longwall deep into goaf zones occurs. One of the wall ventilation systems, in which this phenomenon is quite intense, is the so called “Y” ventilation system. This migration is immensely unfavorable because it can lead to the self-heating process of coal left in a goaf and, consequently, to an endogenous fire. Such a fire is a great threat to both the safety and continuity of operation processes. For this reason, various activities are undertaken to prevent such a fire from occurring in goaf zones. One solution is a method presented in this article. It aims at determining an area in goaf zones, where an endogenous fire may occur. The study focused on the longwall ventilated with the Y system. This area was determined based on two criteria, namely air velocity and oxygen content. The study was carried out for various volumes of air supplied to the longwall. Therefore, the purpose of the study was to develop research methodology and determine the location of an area at the risk of an endogenous fire. The location of this area was determined for three different volume expenditures of air supplied to the longwall ventilated with the Y system.
Źródło:: Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 206--215
2545-2827
Pojawia się w:: Multidisciplinary Aspects of Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Designing process of a toothed segment of the KOMTRACK haulage system
Autorzy:: Kalita, Marek
Powiązania:: https://bibliotekanauki.pl/articles/2064367.pdf
Data publikacji:: 2019
Wydawca:: STE GROUP
Tematy:: longwall system
shearer
shearer haulage system
toothed segment
gear wheel
system ścianowy
kombajn
system posuwu kombajnu
segment zębaty
koło zębate
Opis:: The following stages of a designing process of the toothed haulage segment are presented in the article. The toothed segment, developed within the framework of the KOMTRACK project, is an element of an innovative haulage system for highly productive longwall complexes. The project, according to the Contract No. POIR.04.01.04-00-0068/17, realized by the consortium: KOMAG, AGH University of Science and Technology, Foundry Institute, Specodlew Innovative Enterprise of Foundry Engineering, Ltd. and Polish Mining Group, J.S.C., is co-financed with the means of the European Regional Development Fund. The toothed bar, made of toothed segments of the haulage system, works together with the track wheel of a shearer haulage unit. A distinguishing feature of the newly designed haulage system, in relation to the system used at present, is its flexibility enabling individual toothed segments to adapt to longitudinal and transverse curvatures of the longwall conveyor track, which guarantees a correct cooperation with the track wheel.
Źródło:: New Trends in Production Engineering; 2019, 2, 1; 121--129
2545-2843
Pojawia się w:: New Trends in Production Engineering
Dostawca treści:: Biblioteka Nauki

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