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 15.3.7 Live Roller Conveyors - Belt Or Chain Driven
Nip points occur between chain and sprockets on chain driven live roller conveyors and
between belt and carrier rollers on belt driven live roller conveyors. Nip points also occur at
terminals, drives, take-ups, idlers, and snub rollers where the belt changes direction. A return
belt idler does not require guarding. In addition, they occur on transfers and diverters used with
live roller conveyors. Shear points occur at automatic take-ups; they shall be guarded. On chain
driven live rollers, in addition to covering the top of the sprockets, the guard should extend
downward to obstruct entrance from the side and from below, or the underside should be
covered unless guarded by location or position. on belt drive live roller conveyors, nip points
between the belt and roller may be considered guarded if the load carrying rollers are spaced so
as to prevent access, if plates or rods are placed between rollers, if pop-out rollers are used as
load carrying rollers, or if other suitable guarding is used (such as guarding by location).
15.3.8 Mobile Conveyors
Mobile conveyors shall be provided with a brake, rail clamp, or other position loading device
for each motion, such as, but not limited to, luffing, slewing, and traversing, where movement
would prevent a hazard. Limit switches shall be provided on rail mounted mobile conveyors to
limit the travel within design limits. Rails stops shall be provided beyond the design travel limits
to physically stop the mobile conveyor in case of overtravel. Sweeps shall be provided on all rail
mounted mobile conveyors to deflect objects ahead of the pinch point between wheels and rails
where a hazard to personnel would result without the sweep. A mobile conveyor shall be
designed to be stable against runaway or overturning under normal conditions of operation.
Resting a portion of a mobile conveyor on the ground, a pile, or on any other support shall not
cause instability of the machine. Where power to electrically powered mobile conveyors is
provided by trolley or rail, these conductors shall be guarded in such a manner as to prevent
accidental contact by personnel. When a mobile conveyor is exposed to high wind conditions
and a hazard to personnel exists, normal operation shall cease and, if necessary, the conveyor
shall be moved to a parking position and secured. When an operator is required on a mobile
conveyor, a platform or cab shall be designed so that, when the operator is on the platform
engaged in the normal performance of his duties, he will be protected from injury. where
operation is such that there is danger of movement of the mobile conveyor into the stockpile or
any other obstacle, a detector shall be provided to stop the conveyor movement.
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