US 4,420,278 AGranted

Heading shield

AssigneeDowty (South Africa) (Proprietary) Limited

InventorsAndrew J. Walker, John C. Watt

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Abstract

The roof of a heading cut by a continuous mining machine is supported by cantilevered roof beams forming part of a shield. There are at least two sets of roof beams which can be raised and lowered separately by means of hydraulic rams. When one set is lowered and the other set is raised, the lowered set can be pushed forward against the raised set by means of hydraulic rams. The cantilevered roof beams extend far enough forward to support the roof over the driving position of the continuous mining machine. The width of the shield should be less than the width of the mining machine, so that the shield can advance along the heading cut by the mining machine. Furthermore, the shield includes a conveyor for conveying the mined material from the mining machine backwards to a shuttle car or other conveying system.

A mobile mine conveying and support apparatus for protecting a separate continuous mining machine and collecting material mined by said machine, said apparatus comprising:

(a) a first portable mine roof support means, said means having;
(i) at least two longitudinal roof beams generally parallel to one another to engage the mine roof,
(ii) at least two longitudinal base support means mounted below said roof support beams to engage the mine floor,
(iii) at least two hydraulic pistons mounted therebetween for intermittently urging said roof beams into engagement with a mine roof,
(b) a second portable mine roof support means, said means having;
(i) at least two longitudinal roof beams generally parallel to one another to engage the mine roof adjacent the roof beams of said first support beams,
(ii) at least two longitudinal base support means mounted below said roof support means to engage the mine floor adjacent the longitudinal base support means of the first support means,
(iii) at least two hydraulic pistons for intermittently urging said roof beams into engagement with said roof when said roof is not supported by said first support means,
(c) the innermost longitudinal base support means of said first and second support means defining therebetween an operating space for a continuous mining machine;
(d) hydraulic advancing means for linking said first and second portable roof support means to advance each of said support means when its respective roof beams are withdrawn from engagement with said mine roof;
(e) conveyor means mounted between the inner most longitudinal base support means of said first and second mine roof support means for collecting and conveying material mined by said continuous mining machine;
whereby said portable roof support means is advanced intermittently forward by said hydraulic advancing means to protect an operator of a separate continuous mining machine that is advanced forward in a continuous manner.

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Abstract

Claims12