DE2355044A1 - Air duct filter for mine tunnels - with filter fitted with vibrators, air nozzles and dust discharge worm conveyor - Google Patents

Abstract

The dust produced by the operation of a tunnelling machine or road header in an underground mine can be extracted and collected by drawing the dust laden air into a duct by a fan. The duct downstream of the fan is subdivided by a filter plate which is equipped with vibrators and/or air nozzles. The dust removed by them from the filter is discharged by a worm conveyor and the clean air is passed along into the next duct section. This eliminates the conventional wet filters which can cause trouble where the floor is inclined to swell. The clean air downstream need not be conveyed at high speed because the fear of dust deposn. has been obviated; the result is a considerable saving in power.

Description

Description and explanation of the patent application "Luttenfliter, preferably for mining and tunneling routes. · ¹

In mining and tunneling, the predominantly used to drive track cutting machines.

So far, all of these machines have been dusted by High-performance Veivturi dust extractor. ;

The reason for this deduster construction is in primarily due to the fact that the compact design of a wet venturi deduster is the only one Possibility is in the narrow track conditions to accommodate a dust extractor.

However, a wet dust extractor cannot be used in all routes begin, as the surrounding rock often tends to swell due to water ejection.

In this case, a dry filter deduster is the the only option,

The filter dedusters that have been state-of-the-art up to now due to their large construction do not allow any in possible to add.

509819/0592 ~ ² "

For this reason it is proposed according to the invention, to build a filter dust extractor with a suction Lutte can be combined.

The reason for this construction according to the invention is as follows:

In companies where wet dust extractors are not used for the reasons mentioned above, today one often goes over to this and uses a fan in the area of the face, on the pressure side the dusty air via ducts to the tunnel exit transported.

The amount of dust on partial and full cut machines per

3
Nm exhaust air are between IO - 30g.

For this reason, the air velocities must be This type of dust control should be chosen very high, i.e. above 25 m, in order to prevent sedimentation in the ducts to prevent.

Naturally, this means an extremely high energy requirement and, of course, a high level of wear and tear for the downstream Fans, for example, in a tunnel length of several 1000 m at certain intervals from about 1000 m would have to be set.

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The inventive idea is based on the fact that a duct is built behind the fan * which the Makes air so pure that the air exiting behind the filter surfaces without sedimentation is less Speed can be transported via the duct to the Stollehmund due to the small grain fraction, or but is diluted with fresh air supplied to the extent that that the permissible limit values for breathable air have been reached will.

According to the present invention, such a construction can be made as follows be executed:

A round or square duct is placed over a dia Gonal or bisecting surface with e.g. felt filter mats Mistake.

The surface loading for these special filters can be up to

'3 2:. .-. ■■■■. ■. ■ ■■. . . "■ to be 10 m per m.

This means for a 10 m long piece of duct and lm0

2 3

= 10 m or 100 m of air can be cleaned per minute will.

According to the invention, these filter mats are placed between vibrating screen surfaces set and kept in motion with air vibrators and / or electric vibrators, so that the dust from the Surfaces sloping down and caught in the lower inflow area and is discharged e.g. by means of a screw conveyor.

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Furthermore, according to the invention, the cleaning can be intensified in which air nozzles are provided on the clean gas side, which are supplied with compressed air, which is controlled as a function of time, clean the filter surface.

The clean air can then a blow pipe to be led out of the tunnel.

The accompanying drawing shows the arrangement according to the invention:
with 1 the semicircle is shown as a lower part

a filter duct with screw discharge, with 2 the flexible screw,
with 3 the filter mat,
with 4 vibration seals below and above the filter mat,

with 5 vibrators in electrical or compressed air design, with 6 controllable compressed air nozzles,

with 7 the upper surface of the filter duct in the clean gas part, with 8 the blowing fan,
with 9 the outgoing duct on the clean gas side.

It goes without saying that the invention is not limited to the embodiments shown and described in detail above limited, but there are numerous

509819/0592

Changes are possible, but without deviating from the basic idea of extracting dust from tunneling or mining machines with a fan and blowing in the dusty weather via a duct-shaped filter surface, the filter surface taking up a rectangle or a round duct cross-section and the partition wall through filter surfaces opposite the exhaust side is separated, wherein the cleaning ■ - is carried out \ of the partition wall by vibrators or and counter air flow nozzle, wherein the dust separated from the filter surface through discharge members, preferably flexible screw conveyor, from the Anströmflächenteil the Filterlutte off \ "- ■ -; .- ·. ..--- / .- -; ■■■. ■ _ "- ■ ';

will be carried.

Claim ;

509 819/0592

Claims (1)

Claim t Claim it Filter duct, preferably for mining and tunnel construction, characterized in that a tubular duct-like structure flexible or rigid design wira provided with a partition opposite the clean gas flow, the partition made of filtering material and or via vibrating and air purging nozzles are reinforced from the clean gas side and on the deepest part of the filter ducts, preferably flexible screw conveyor devices are attached. 509819/0592