antifriction bearings spaced on not more than [_____] meter feet centers.
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 the coal. Extend grease pipes to one side for
four point lubrication from tunnel walkway.
2.9.7.8
Load Skirts
Steel plate 6.35 mm 1/4 inch thick supported by structural brackets from
conveyor frame. Skirts shall have rubber strips along the bottom edge to
seal belt. Strips shall be easily adjustable by means of a clamp bar
arrangement not requiring slotted bolt holes.
2.9.7.9
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 the full length of the 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.
2.9.7.10
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.
2.9.7.11
Vibrating Feeder
Flat pan type vibrating feeder to convey coal from the day hopper to the
belt conveyor. Pan shall be [_____] mm inches wide by [_____] mm inches
long, with 150 mm 6 inch sides, constructed of 6.35 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
the hopper.
2.9.8
Shallow-In-Built Bar Flight Feeder and Receiving Hopper
Bar flight feeder shall be totally enclosed, dusttight type with
shallow-in-built [track] [truck] hopper. Bar flight feeder shall have a
horizontal length of [_____] meter feet [_____] mm inches between sprocket
centers, operate at not greater than [_____] m/s fpm, and have a capacity
of not less than [_____] Mg tons per hour of [_____] size coal. Provide
feeder complete with continuous chains and attached bars, terminal
sprockets, gears, shafts, bearings, troughs, enclosure, frames, [truck]
[track] hopper, grating, regulating gate, hinged inspection doors,
discharge chute, electric motor, reduction gear, and supports.
2.9.8.1
Head and Foot Shafts
Head and foot shafts shall be not less than [_____] mm inches and [_____] mm
inches in diameter, respectively. Construct shafts of coal rolled steel
SECTION 15502N
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