Browsing by Subject "hard rock"

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Access status: Open Access ,
Effect of selected working conditions of cutting picks on their wear during the mining of hard rocks
(2010) Kotwica, Krzysztof
The article presents the influence of work conditions of rotary-tangential picks on their wear while compact rocks mining. There was mainly presented the influence of applying high-pressure support and spraying the tangent-rotary tools with water jets on their quantitative and qualitative wear during conducted laboratory tests in comparison to tools operating in dry conditions. There was suggested and presented a solution of holders lubricated with water under pressure to provide proper conditions of tangent-rotary tools work in the clamp. The results of laboratory tests of rotary-tangential picks fixed in the folders were presented and compared with results of picks only supported or sprayed with high-pressure water jets.
Access status: Open Access ,
The designing process and stand tests of a new solution of a mining head with disc tools of complex motion trajectory for compact rocks mining
(2010) Kotwica, Krzysztof; Stopka, Grzegorz; Kalukiewicz, Antoni; Gospodarczyk, Piotr
The article presents a new solution of a mining head with asymmetrical disc tools of a complex motion trajectory for hard rocks mining. The developed and manufactured head is to be an alternative for traditional milling heads used in roadheaders. The basis for the head development was elaborated based on laboratory tests performed in the AGH University of Science and Technology in Krakow. The technical design and the head were implemented in cooperation with the factory of REMAG S.A. in Katowice. The head, mounted on the KR 150 roadheader, underwent field tests. Their results allowed modernisation of the head and its adaptation to further industrial tests in mining plants.