A new face drilling rig for narrow tunnels and ... - Advanced Mining

As a rule, large drive units that have a great dead
weight on the one hand, and that transmit and absorb high
forces on the other, require special constructions. When
rating and dimensioning such flexible supports, the small,
maximally admissible surface pressure of the elastomers
must be considered. If the structural shape does not
allow, within the elastomers, a reduction of the transverse
stresses, elastomers with fabric inserts will have to be
given preference. Pneumatic springs are considered
excellent vibration isolators. But they cannot be used in
all zones, because of the extensive maintenance work
required.
Issue 04 | 2010
Fig. 33:
Flexible support of air
conditioning unit
Fig. 34:
Flexible Support Lifting-Closing gear
TRANSFER OF TECHNOLOGY
• Vibration-insulated support of the drive units as well as of
air-conditioners
• Complete cladding of the machine houses by means of
sound insulation cases featuring sound insulation factors
that are considerably high. (Here, it is deemed absolutely
necessary to point out that the insertion loss factor on
a construction composed of sound insulation cases is
considerably smaller than that given in the data sheets of
the manufacturer for single elements.
• Installation of sound absorbers at the openings required
(e.g. for rope passage)
• Installation of low-noise fans
• Low-noise tooth of the gearboxes
• Low speeds of the gearboxes, if possible
• Frequency converters must have high frequency, if
possible (lifts)
• Small fall hight of material into the bin
• Let always a material buffer in the bin; the bin must never
be completely emptied
• Cladding of the bin (dependent on the material to be
handled), and provide for a flexible support, if possible
• Dust plants mainly working dry-mechanically are to be
avoided, or respective sound insulation measures are to
be planned commonly with the supplier.
• Sound insulating cladding of large, sound-radiating
surfaces
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