Browsing by Subject "thin seams"

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Access status: Open Access ,
Longwall shearers for exploiting thin coal seams as well as thin and highly inclined coal seams
(Wydawnictwa AGH, 2018) Bołoz, Łukasz
Due to a number of advantages, mechanized longwall systems are applied to exploit seams characterized by a wide range of thicknesses. In the case of thin seams as well as thin and highly inclined ones, there are numerous solutions for longwall shearers that allow for the exploitation of coal seams with a minimum thickness of 0.4 m and a gradient of up to 85°. The article focuses on longwall systems designed for such seam mining. The most important assumptions and advantages of longwall exploitation are presented, and mining machines that are key elements of mechanized longwall systems are discussed. Attention has also been drawn to the various solutions of shearers that are currently used on the domestic market. A wide range of available solutions allowed for distinguishing and presenting ten types of shearers.
Access status: Open Access ,
Project and test results of new solution for powered roof support for low seams
(Wydawnictwa AGH, 2019) Krauze, Krzysztof; Rączka, Waldemar Stanisław; Stopka, Grzegorz
The subject of thin seam exploitation is a complex problem, in reality, it involves several problems such as technical, ergonomic, and economic barriers. They refer mainly to combined longwalls - where a human presence is required at the site, the most important problem is the issue of the limited workspace in longwall roadways. This generates engineering and organizational problems, especially during the launching and removal of the longwall roadways. Having considered the above-mentioned, the Department of Mining, Dressing, and Transport Machines at AGH in Krakow has begun research whose main objective is to develop and test a new structure for a powered support for thin seams. In this paper, virtual models of the new hydraulic roof support and a conception of the structure of a control system were presented as well as the test results of the new construction hydraulic roof support. Research in this field was conducted for the project entitled «Studies of the Development of an Innovative Hydraulic Roof Support for Low Seams». The project is funded by the National Center of Research and Development (NCBiR).