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Browsing by Subject "bucket wheel excavators"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Analiza możliwości zastosowania koparek kompaktowych w polskich kopalniach węgla brunatnego
    (Wydawnictwa AGH, 2011) Kasztelewicz, Zbigniew
    The paper presents the technology of exploitation using compact bucket wheel excavators in lignite, clays or hard rocks like limestones. Advantages and disadvantages of these kinds of machines are discussed. A comparison of traditional BWEs used in Polish and foreign lignite mines with compact BWEs is conducted. Conclusions from this analysis allow to state that compact BWEs offer very advantageous mass to efficiency ratio and therefore allow to reduce investment costs in the mines using continuous exploitation systems.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Analiza parametrów pracy krajowych kopalń węgla brunatnego
    (Wydawnictwa AGH, 2011) Kasztelewicz, Zbigniew
    The article presents a comparison of numerous parameters describing the operation of Polish lignite mines. Coal production and overburden stripping, overburden to coal ratio, the amounts of water pumped out, water to coal ration and employment were analyzed. An analysis and comparison of capacity, time of malfunctions, energy consumption and age structure was also conducted. To summarize the article, a comparison of chosen parameters of Polish and German BCS systems was performed.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Analiza przyczyn pęknięć w rejonie połączenia dyszla skrętnego z dźwigarem gąsienicowym pojazdu podawarki
    (Wydawnictwa AGH, 2009) Kaczyński, Paweł; Czmochowski, Jerzy
    The most important problems during surface mining are fractures of a mining machines load-carrying structures. They occur most often in the connection region of the steering frame and caterpillar girder. The greatest forces affect this elements in a case of changing the trajectory. According to standard DIN 22261 fatigue calculations of undercarriages are not compulsory. In this article the fracture source of a loading elevator undercarriage connected with an excavator SchRs-4000 was analyzed by the use of numerical methods. The forces acting on the undercarriage were calculated. The Finite Element Analysis was carried out and the results were presented in this paper. On the basis of FEA the fracture spots of a load-carrying structure were specified and the proposals of strengthening were suggested in order to improve fracture toughness.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Pierwsza polska koparka KWK 910 do pracy w utworach trudno urabialnych
    (Wydawnictwa AGH, 2009) Wocka, Norbert
    The first Polish BWE, dedicated to digging of a hard material in Open Pit »Turów« was presented in this paper. The main technical and technological data were listed and some particular design solutions, concerning work in hard material, were presented in detail. Manufacturers of main units of the excavator were also listed.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Zastosowanie koparek kompaktowych w kopalniach odkrywkowych
    (Wydawnictwa AGH, 2010) Kasztelewicz, Zbigniew; Sypniowski, Szymon; Zajączkowski, Maciej
    The paper presents the technology of exploitation using compact bucket wheel excavators in lignite, clays or hard rocks like limestones. Advantages and disadvantages of these kinds of machines are discussed. A comparison of traditional BWEs used in Polish and foreign lignite mines with compact BWEs is conducted. Conclusions from this analysis allow to state that compact BWEs offer very advantageous mass to efficiency ratio and therefore allow to reduce investment costs in the mines using continuous exploitation systems.