Minimizing Internal Leaks of a Powered Roof Support’s Hydraulic Prop Based on Double Block with Charging

Dawid Szurgacz, Beata Borska, Ryszard Diederichs, Anthony J. S. Spearing and Sergey Zhironkin ()
Additional contact information
Dawid Szurgacz: Center of Hydraulics DOH Ltd., ul. Konstytucji 147, 41-906 Bytom, Poland
Beata Borska: KWK Ruda Ruch Halemba, ul. Halembska 160, 41-717 Ruda Śląska, Poland
Ryszard Diederichs: Center of Hydraulics DOH Ltd., ul. Konstytucji 147, 41-906 Bytom, Poland
Anthony J. S. Spearing: School of Mines, China University of Mining and Technology, 1 Daxue Road, Tongshan District, Xuzhou 221116, China
Sergey Zhironkin: Department of Trade and Marketing, Siberian Federal University, 79 Svobodny av., 660041 Krasnoyarsk, Russia

Energies, 2023, vol. 16, issue 3, 1-14

Abstract: The hydraulic system of a powered roof support performs two functions. The first function is to control the powered roof support in the extraction wall. The second function is to protect against adverse overloads resulting from rock mass pressing directly on the powered roof support. This damaging phenomenon is prevented by the protection of the powered roof support, with a safety valve built into the hydraulic system or directly into the prop. However, the third function proposed by the authors based on the research results is to minimize leaks. These leaks usually develop in the props or in the hydraulic system. The authors propose implementing changes to the hydraulic system for this purpose. The change consists of replacing the existing support block with a double block with charging. Tests were carried out in real conditions, that is, a mining wall. Tests in the mining wall were carried out on the powered roof support’s leaking prop. As a result of charging, the actual load capacity of the prop increased by about 10–50% in relation to the load capacity before charging. The use of a double block with charging ensured that the pressure in the under-piston space of the prop was maintained at a minimum of 250 bar. The results allowed us to determine the usefulness of the proposed solution and eliminate its disadvantages—the designated direction of research and development on the powered roof support allowed us to expand its functionality by minimizing leaks.

Keywords: internal leaks; hydraulic prop; powered roof support; tests under real conditions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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