Authors: Szurgacz, D., Diederichs, R., Brzózka and, M.

Title of the article: The role and relevance of a double block in the hydraulic system of a powered roof support

Year: 2020, Issue: 3, Pages: 4-17

Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)

Index UDK: 622.285:624.042.3

DOI: 10.26730/2618-7434-2020-3-4-17

Abstract: One of the main elements ensuring the functionality of underground mining operations is a powered roof support, the parameters of which directly affect the safety of work.
The article presents a new design of a double valve block and its significance in terms of the loss of support in a powered roof support section caused by internal leakage of a hydraulic leg. The tests of the double block for a leg with internal leakage proved that it is important to secure the space under the piston as such system allows to maintain the load-bearing capacity at required level.
The presented leakage simulation compares the benefits of a single block with the new double block.
The new construction of the double valve block was developed based on the assumptions of functionality, conducted simulation, stand and operational tests and is aimed at maintaining the load-bearing capacity of the roof support in the case of internal leakage of the leg.
The main function of the double block is to maintain the support of the leg and to diagnose the leakage. There are two controlled non-return valves in the body of the block designed to cut off the space under and above the piston. There are also an additional ports: an A port size DN in the block body for connecting a suitable overflow valve to limit the maximum pressure in the leg, and AM and BM ports for connecting pressure indicators or pressure gauges.
The use of the double hydraulic block for the space under the piston of the leg, which works only in compression, enables diagnostics of the leakage and, if it occurs, enables the leg to operate with nominal working support until it is replaced.

Key words: stand tests support hydraulic system powered roof support

Receiving date: 08.05.2020

Publication date: 30.11.2020

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