Wyniki wyszukiwania - Biblioteka Nauki

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Drive simulation tests for electric drilling rig

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Kotwica K. , Stopka G.

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tom Vol. 2, Iss. 1

96--103

EN

The article presents methodology and selected results of simulation tests of diesel and electric dive system for drilling rig. Research in this field were conducted under the project no. POIR.01.01.01-00-D011/16 entitled „New generation of modular rigs, drilling and bolting, with battery drives, designated to work in underground cooper ore and raw rock material mines”. The project is funded by the National Center of Research and Development (NCBiR). The aim of the project is to design and implementation of innovation drilling and bolting rig with electric drive system. Due to the complexity of the structure of the drive system (mechanical, hydraulic and electrical elements), it was necessary to use advanced simulation software dedicated to multiphysics analysis. Data presented in the article can be used as guidelines in design process of drilling and bolting rigs as well as in optimization their driving system and mechanical construction.

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The Cutting Resistance of Rock Salt in Function of Temperature

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Kotwica K. , Stopka G.

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tom Vol. 3, Iss. 1

211--220

EN

Currently over then 16 percent of the total worldwide salt production is excavated in underground mines. Salt deposits often lie at great depths up to 1000 m, where the temperature of the surrounding rocks reaches 50°C and even exceeds it. A large part of it is exploited using mechanical methods, mainly with the use of road headers and continuous miners. When excavating salt rock, the cutters of the road header mining head come into contact with the rock. This generate friction and in consequence a rise in temperature. In AGH University of Science and Technology the laboratory tests were carried out to determine the effect of temperature on cutting resistance and selected mechanical properties of rock salt. On the special laboratory test stand the rock salt sample was cutted at three different temperatures - 20, 50 and 80°C. The cuttability index and the side chipping angle were measured for each temperature. Additionally the same tests were performed in the case of salt sample after cooling to room temperature. The selected mechanical parameters of rock salt - compressive, tensile and shear strength were also measured for the same temperature values. The obtained results were compared and described in the paper.

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The effect of temperature on the mechanical properties and workability of rock salt

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Małkowski P. , Bednarek Ł. , Kotwica K. , Stopka G.

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tom Vol. 2, Iss. 1

384--393

EN

Underground salt mining accounts for about 16 percent of the total salt production worldwide. When excavating salt rock, the cutters of the road header come into contact with the rock. This produces friction and, consequently, a rise in temperature. Generally, as temperature increases, salt gradually loses its plasticity. The extent of these alterations depends on the presence of other minerals in the rock. This paper presents the results of laboratory tests on regularly shaped samples of salt. An analysis was performed of the results of compressive, tensile and induced-shear strength, and of Young's modulus, Poisson's ratio, cuttability index and side chipping angle. The testing was conducted on samples with a temperature of about 20°C and samples heated to 50°C and 80°C. The tests showed that as temperature increased, so did compressive and tensile strength, and longitudinal and transverse strain of salt. The temperature increase caused, however, a decrease in shear strength. The cuttability index and the side chipping angle also decreased when the heated samples were being cut. The percentage changes in the parameters within the 60-degree temperature range were as high as several dozen percent.

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Projekt i badania stanowiskowe nowego typu obudowy zmechanizowanej do pokładów cienkich

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Krauze K. , Rączka W. , Stopka G.

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2019

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tom R. 57, nr 1

34--39

PL

Tematyka eksploatacji pokładów cienkich jest obecnie jednym z głównych obszarów zainteresowań producentów oraz użytkowników zmechanizowanych kompleksów ścianowych. Wynika to z faktu, iż niezależnie od szeregu czynników górniczo-geologicznych, które w różnym stopniu mogą wpływać na możliwości techniczne prowadzenia ścian niskich, kwestia wzrostu koncentracji wydobycia z pokładów cienkich jest powiązana przede wszystkim z konstrukcją odpowiednio przystosowanych do ekstremalnie trudnych warunków maszyn zmechanizowanego kompleksu ścianowego. Szczególnie istotną rolę w tego typu warunkach eksploatacyjnych odgrywają cechy konstrukcyjne obudów zmechanizowanych. W artykule przedstawiono projekt nowej sekcji obudowy zmechanizowanej do pokładów cienkich oraz wyniki badań stanowiskowych z jej udziałem. Prace badawcze w tym zakresie zostały zrealizowane w ramach projektu pt. „Prace studialne i badawcze nad opracowaniem zmechanizowanej obudowy nowego typu do pokładów cienkich” dofinansowanego z Narodowego Centrum Badań i Rozwoju (NCBiR).