Mining or in situ disintegration of hard material – Processes – Mine safety
Patent
1995-11-15
1997-10-07
Bagnell, David J.
Mining or in situ disintegration of hard material
Processes
Mine safety
55304, 299 64, E21C 3522
Patent
active
056739745
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/AT95/00047, filed May 15, 1995.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a dry dust removal device for tunnelling or extraction machines, comprising a suction fan and suction openings close to the work surface.
2. The Prior Art
Dust removal devices for tunnelling or extraction machines usually comprise an exhaust duct and a duct for feeding fresh air. The exhaust duct may be connected to suction channels provided on the tunnelling or extraction machine, intake openings or suction openings already having been provided near the facing. With such ventilation devices it was mostly common at the same time to precipitate part of the dust by water. However, dust precipitation by water spraying is not readily feasible, in particular, in potassium mines because this would make the air aggressive, thus creating inacceptable working conditions near the work surface.
The connection of an airduct to a tunnelling machine impedes the manoeuvrability of the same such that there are limitations. In particular, at high temperatures at place, amounting up to 50.degree. C., it is, moreover, also necessary to provide an appropriate circulatory cooling for the machine aggregates of the tunnelling or extraction machine in order to ensure cooling irrespective of an external water supply.
SUMMARY OF THE INVENTION
The invention aims at providing a dry dust removal device of the initially defined kind to be used, in particular, in potassium mines, which impedes the tunnelling or extraction machine as slightly as possible and by which the driving performance is not affected by the constantly required renewal of, or additions to, the exhaust duct. Furthermore, the invention aims at providing a device of as low a structure as possible and as machine-integrated as possible, which at the same time offers the opportunity of extracting the separated dust by conveying means. Finally, the invention aims at providing an enhanced cooling of machine aggregates at high temperatures at place, in addition to such dry dedusting. To solve this object the dry dust removal device according to the invention substantially consists in that a filter element is arranged in a housing above the conveyor of the tunnelling or extraction machine, that the housing has closeable openings provided between the filter element and the conveyor device arranged therebelow, and that the air outlet opening of the dry dust removal device is connected to the side of the filter element facing away from said closeable openings. By the fact that a filter element is arranged in a housing above the conveyor device of the tunnelling or extraction machine, it has become feasible to clean this filter element at regular intervals, for instance, by blowing or pressing out dust from the filter elements by compressed air or mechanical means and to discharge the portion of separated solids retained in the filter via the conveyor device of the tunnelling or extraction machine arranged thereblow. By the fact that the housing comprises closeable openings between the filter elements and the conveyor device arranged therebelow, tight sealing can be safeguarded for the suction or dedusting operation such that the total amount of sucked in air is actually conducted over the filter, to which end the air outlet opening of the dry dust removal device is connected to the side of the filter element facing away from the closeable openings. On the whole, this implies a relatively compact, simple construction of the dry dust removal device, which in no way affects the flexibility and manoeuvrability of the tunnelling or mining machine at a high degree of operational safety. The configuration of the dry dust removal device with a self-contained housing allows a number of additional aggregates, in particular, cooling means, to be arranged within this housing such that the recirculating flow at the same time may be employed for cooling machine aggregates. In a particularly advantageous manner, th
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Lammer Egmont
Zitz Alfred
Bagnell David J.
Voest-Alpine Bergtechnik Gesellschaft m.b.H.
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