2.9.8.7
Idlers
Flat type with 125 mm 5 inch diameter steel shells, malleable iron end
brackets, grease sealed roller-type antifriction bearings, and
self-cleaning angle bases. Idler spacing shall be not greater than 1372 mm
4 feet 6 inches. Return idler shall be of the flat single-pulley type
having 125 mm 5 inch diameter steel shells, grease sealed roller-type
antifriction bearings spaced on not more than [_____] meters feet on
center. Provide self-aligning training type idlers, as required, to ensure
proper training of the belt. Provide additional idlers, as required,
beneath track or truck hopper for support of belt and coal and to properly
protect belt from impact caused by coal. Extend grease pipes to one side
for four point lubrication from tunnel walkway.
2.9.8.8
Load Skirts
Steel plate 6.35 mm 1/4 inch thick supported by structural brackets from
conveyor frame. Skirts shall have rubber strips along bottom edge to seal
the belt. Strips shall be easily adjustable by means of a clamp bar
arrangement not requiring slotted bolt holes.
2.9.8.9
Frame, Supports, and Enclosure
Construct frame of either structural steel channel side stringers properly
tied and braced for support of head and foot shafts with 12 gage (2.66 mm
0.1046 inch) steel deck plate full length of feeder, or integrally formed
plate conveyor and deck frame. Support idlers from conveyor frame.
Support frame from floor of tunnel [by steel channel legs] [as indicated].
Completely enclose feeder in a dust-tight enclosure constructed of not less
than 10 gage (3.42 mm0.1345 inch) steel plate with easily removable
gasketed side panels containing handles at each panel end.
2.9.8.10
Loading Hopper
Constructed of not less than 10 mm 3/8 inch thick steel plate connected to
bottom flange of the track or truck hopper. Provide an adjustable
regulating gate adjacent to loading hopper for regulating height of coal on
the belt.
2.9.8.11
Vibrating Feeder
Flat pan type vibrating feeder to convey coal from day hopper to belt
conveyor. Pan shall be [_____] mm inches wide by [_____] mm inches long,
with 150 mm 6 inch sides, constructed of 6 mm 1/4 inch thick stainless
steel. Provide feeder with integral electromechanical drive and a remote
controller. Controller shall contain operating switches and rate of flow
adjustment and the power source for the feeder drive. Controller shall be
designed for 460 volt, 60 Hz. supply voltage. Support feeder from hopper.
[2.9.9
Shallow-In-Built Bar Flight Feeder and Receiving Hopper
**************************************************************************
NOTE: Determine by an economic analysis and a
technical evaluation if shallow-in-built bar flight
feeders and receiving hoppers might be used instead
of track or truck hoppers with belt feeders.
**************************************************************************
Bar flight feeder shall be totally enclosed, dusttight type with
SECTION 15501N
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