专利名称：MINE ROOF SUPPORTS申请号：AU5345873申请日：19730319公开号：AU470683B2公开日：19760325
摘要：The invention is concerned with a system of mining mineral in which a self-propelled mining machine, having mineral cutting and collecting means, travels along amineral face, from which it extracts and collects mineral, substantially parallel to a line ofself-advancing mine roof supports. The path of travel of the mining machine is defined atone side by means connected to said roof supports and at the other side by the mineralface exposed by the mining machine as it extracts mineral therefrom. The mine roofsupports are advanced behind the machine and towards the mineral face by an amountwhich is a fraction (e.g. half) of the thickness of the web of mineral removed from the faceby the mining machine. Roof supporting extension bars of the supports may then beadvanced towards the mineral face to provide roof support in the vicinity thereof. Themining machine then flits back along a path defined by the path defining means and saidpath defining means is then advanced towards the mineral face, by pressure fluid rammeans, by the same amount as said advance of the supports. The supports are thenfurther advanced, so that the total advance thereof is equal to the total thickness of theweb of mineral removed by the mining machine, following which the path defining meansis further advanced by the same amount as said further advance of the supports. Thiscycle of operations is then repeated after the roof supporting extension bars have beenretracted if they have not automatically been pushed back by the advance of the
supports towards the mineral face.
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