2.9.12.9
Emergency Stop Cord and Switch
Provide emergency stop cord the length of the conveyor to actuate a switch
for stopping the conveyor. Switch shall have flag to indicate actuated
switch and shall have positive safety lock that cannot be accidentally
reset. Cord shall be not less than 2.38 mm 3/32 inch galvanized aircraft
cable with a minimum 1.19 mm 3/64 inch vinyl or nylon protective coating.
Provide sufficient number of switches to prevent cable weight from
actuating switch.
2.9.12.10
Belt Alignment Switch
Provide belt alignment switches on each side of the belt mounted off
conveyor frame or discharge chute to stop conveyor under belt misalignment
or runoff conditions. Mount switches on breakaway mounts to prevent damage
from runaway belt.
2.9.12.11
Idlers
Troughing idlers shall be [20] [35] degree three-pulley type with 125 mm 5
inch diameter steel shells, malleable iron end brackets, grease sealed
roller type antifriction bearings, and self-cleaning angle bases.
Troughing idler spacing shall be not greater than 1.37 meters 4 feet 6
inches, with additional idlers at the loading point. Return idler shall be
flat single-pulley type having 125 mm 5 inch diameter steel shells, grease
sealed roller type antifriction bearings and spaced not more than 3 meters
10 feet on center. Provide self-aligning training type trough and return
idlers at not greater than 15.24 meters 50 foot intervals to ensure proper
training of belt. Extend grease pipes to one side for four point
lubrication from walkway.
2.9.12.12
Load Skirts
Not less than 6 mm 1/4 inch thick steel plate and supported by structural
brackets from conveyor frame. Skirts shall have rubber strips along bottom
edge to seal belt. Strips shall be easily adjustable by means of a clamp
bar arrangement not requiring slotted bolt holes.
2.9.12.13
Frame, Supports, and Walkway
Frame shall be structural steel truss type with head and foot terminals
framed of structural steel. Support frame from grade on structural
A-frames set on concrete footings as indicated. Support idlers on not less
than 150 mm 6 inch channel stringers braced and tied to structural steel
truss frame. Provide a 12 gage (2.66 mm0.1046 inch) steel deck plate for
full length of conveyor. Provide a curved belt cover constructed of not
less than 16 gage (1.52 mm0.0598 inch) corrugated galvanized metal having
removable panels on walkway side for access to idlers. Provide walkway not
less than 914 mm 36 incheswide, supported from structural steel framing for
entire length of conveyor. Walkway shall be complete with handrails and
metal nonslip grating meeting requirements of 29 CFR 1910-SUBPART D,
Walking and Working Surfaces.
2.9.12.14
Discharge Hopper
Construct of not less than 6 mm 1/4 inch thick steel plate to discharge on
a discharge chute. Provide a discharge hood built of 10 gage (3.42 mm
0.1345 inch) steel plate enclosing top, front, and sides above discharge
hopper.
SECTION 15501N
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