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The safety conditions of the underground works carried out for the coal mining process are ensured by longwall supports. The particularities of the system of hydraulic powered roof supports are given by structure of the supporting component, by the pumping station and respectively by the operating liquid and the length of the wall the activity of which needs to be ensured. The pumping stations used for the supply of the roof supports, also called hydraulic assemblies, are composed of: the oil in water tank, the pu...

The particularities of the hydraulic system of the roof supports are determined by the repetitive structure specific to the supporting component, by the supply network, by the operating liquid and by the length of the coalface, as well as by the operation principle of the pumping station supplying the execution elements with the average flow given by the load and the resistance of the hydraulic networks. The paper highlights all these particularities bringing forward a series of practical details for calculation o...

The use of coal resources has contributed to the economy of Jiu Valley over a long period of time. Considering the long-term role of coal, many experts believe that the coal-based energy is sustainable, ensures energy security, and may become a growth factor in the area. The knowledge and technologies improvement for coal extracting from the Jiu Valley mining basin, where many mines were closed due to lack non-performing loans and lack of profitability, represents a first step in the sustainable rehabilitation of ...