Boring or penetrating the earth – Boring without earth removal
Patent
1995-10-18
1997-10-21
Neuder, William P.
Boring or penetrating the earth
Boring without earth removal
E21B 1908
Patent
active
056786425
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a drilling arrangement and to a drilling feed mechanism.
A number of different drilling feed devices are used in underground mining and in long hole production drilling. Some of these prior art devices are shown in FIGS. 1 to 5 of the attached drawings.
FIG. 1 shows a common drilling feed construction which includes a feed beam 8 with a chain feed 10 wherein a hydraulic or pneumatic motor rotates a chain sprocket wheel 12 either directly or via a reduction gearbox. The chain is connected to a rock drill 14 and linear movement is thereby imparted to a drill rod 16 which passes through a centralizer 18.
It is also known, see FIG. 2, to make use of a screw feed mechanism wherein a suitable motor 20 rotates a threaded bar 22. A threaded bushing 24 which is engaged with the bar is connected to a rock drill 14 so that rotational movement of the bar is translated into linear movement of the rock drill and its drill rod 16.
It is also known to make use of telescopic cylinders to advance a rock drill. Three types of arrangement are known to the applicants.
The first arrangement, shown in FIG. 3, includes a cylinder 26 and first and second pistons 28 and 30 arranged so that the first piston 28 acts as a cylinder tube for the second piston 30. The first piston i.e. the cylinder tube is movable from a protruding position on one side of the cylinder to a protruding position on the other side of the cylinder. The cylinder 26 is directly connected to a rock drill 14 by a mechanical connection 32.
In the second type of arrangement (FIG. 4) an elongate first piston 34 extends substantially for the full length of travel of the rock drill and passes through a cylinder tube 36 which also acts as a second piston located inside a cylinder 38 which is fixed to a rock drill 14.
In a third arrangement, which is shown in FIG. 5, first and second pistons 40 and 42 are again used with the first piston 40 being located inside a cylinder 44 and extending from one end of the cylinder. The first piston acts as a cylinder tube for the second piston 42 which extends from the cylinder tube in the same direction as a drill rod 16 which is attached to a rock drill 14.
A common feature of the aforementioned telescopic cylinder feeds is that one or both of the piston rods are exposed to the front of the rock drill. Rocks and material which are loosened during drilling can fall on to the exposed pistons and damage the pistons or lead to rapid wear of cylinder seals. This results in additional expense and drilling down time. A similar disadvantage exists in respect of the chain and screw feed type device in that the chain and the threaded bar are exposed to material which is loosened during drilling.
It is desirable to have a constant feed force which is exerted by the drilling feed construction on the rock drill. A constant force is achieved fairly readily with a chain feed or a screw feed. However with multistage telescopic cylinder feeds it is necessary to construct the pistons with areas, which are pressurized, of equal magnitude. This in turn imposes limitations on the dimensions of the feed cylinder which can hinder or prevent optimal designs from being produced.
SUMMARY OF THE INVENTION
The invention provides, in the first instance, a drilling arrangement which includes a feed beam, a drill which is mounted for movement relatively to the feed beam and which is engageable with a drill rod which extends in a first direction from the drill, a multistage telescopic cylinder feed mechanism which includes a cylinder which acts on the drill and piston means which extends only in a second direction which is opposite to the first direction and which is telescopically movable relatively to the cylinder only to one side of the cylinder and which, when extending from the cylinder, moves in the second direction, and means on the feed beam for engaging with a protruding end of the piston means.
The piston means may include a first piston mounted inside the cylinder and a second piston mounted ins
REFERENCES:
patent: 2701551 (1955-02-01), Gunning
patent: 3897719 (1975-08-01), Tipton
patent: 4553612 (1985-11-01), Durham
Briggs Roger Robarts
Leppanen Jarmo Uolevi
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