A new face drilling rig for narrow tunnels and ... - Advanced Mining
A new face drilling rig for narrow tunnels and ... - Advanced Mining
A new face drilling rig for narrow tunnels and ... - Advanced Mining
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• Sur<strong>face</strong>s not directly into contact with the material<br />
must get a rubber lining.<br />
• Sur<strong>face</strong>s directly into contact with the material<br />
are to be lined with solid <strong>and</strong> thick sheet metal.<br />
• Cladding by using sound insulation elements.<br />
• The corner station must be an enclosed type.<br />
Stacker<br />
Tests made on different stackers <strong>for</strong> coal have<br />
shown relatively low sound power levels. Only the<br />
stacker belt conveyor <strong>and</strong> the appertaining drive<br />
unit are considered critical. The noise the falling<br />
bulk material produces, however, can reach a<br />
higher sound power level than the stacker itself.<br />
But the sound power the coal obtains should<br />
be relatively low thanks to its internal damping<br />
property.<br />
Full portal reclaimer<br />
The full portal reclaimer serves to reclaim the<br />
coal piles, dependent on the need of the coking<br />
plant, created by means of the stacker be<strong>for</strong>e. Due<br />
to their design <strong>and</strong> function scraper reclaimers are<br />
to be considered critical components, seen from<br />
the sound-specific point of view.<br />
The reclaimer portal covers the whole stockpile.<br />
On both sides of the stockpile there are laid the<br />
track rails. The real h<strong>and</strong>ling mechanism is the<br />
boom, equipped with a two-str<strong>and</strong>, endless chain<br />
to which the scraper blades are fixed. The boom is<br />
a solid web construction.<br />
The reclaimer capacity is function of the lifting<strong>and</strong><br />
lowering movements of the boom as well as<br />
of the travelling speed. Lowering of the boom takes place<br />
in discrete steps, whereas the chain to which the scraper<br />
blades are fixed works at constant speed. Because of<br />
the known lot of noise portal reclaimers produce during<br />
operation (more than LW=110 dB(A)), the sound power<br />
level has already been reduced during the design phase<br />
by taking the following measures:<br />
• Structure-borne sound insulation of the runner rail of the<br />
chain rollers by using elastomers<br />
• Stiffening by welding in pipe pieces into the sold web construction<br />
of the boom<br />
• Covering the top side of the boom by using sound-deadening<br />
corrugated sheet metal<br />
• Return sprocket made of PA6 to reduce clattering noises.<br />
Issue 04 | 2010<br />
TRANSFER OF TECHNOLOGY<br />
Fig 18:<br />
Portal reclaimer boom<br />
Fig. 17:<br />
Return sprocket of PA6<br />
Noise <strong>for</strong>casting (sound power of drive<br />
mechanisms)<br />
A first, rough assessment of the sound power levels<br />
drive units produce can take place on the basis of the rated<br />
power <strong>and</strong> the nominal speed of motors <strong>and</strong> gearboxes. To<br />
this end, the engineer can rely on the two st<strong>and</strong>ards IEC<br />
60034 <strong>and</strong> VDI 2159. They make it possible <strong>for</strong> us to assess<br />
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