Crushers

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Crushers
Crusher Safety
Crushers
First step in converting shot
rock into usable products
Taking large rocks & reducing
them to small pieces
Primary
Secondary
Primary crushers
reduces rock to
manageable size
Secondary crushers
reduce rock into smaller
sized product
Secondary Crushers
Crushing done in two or three
steps
primary crusher followed by
secondary crusher & tertiary
crushing
Raw material brought to
primary by haul trucks
Crushers Types
Jaw
Impact
Roll
Gyratory
Dust Hazards
Crusher operators exposed to
high levels of dust
Long-term exposure can lead
to silicosis
Dust Control
Booths separate workers from
dust
Water to suppress dust
Local ventilation – captures &
carries dust away from workers
Flying Material
Can spray pieces of rock in all
directions
Crushers have heavy metal
casings around them to help
keep material from being
thrown
Surge Bins
Material that falls, slides or
rolls from surge bins is
dangerous
Most crushers automated, but
workers needed to clear clogs,
check operations & maintain
machinery
Slips & Falls
Slips & falls common crusher
injuries
Spillage can cause falls
Cluttered walkways
Operating Safety
Crushers move rapidly and
powerfully
Not tampered with while
operating
Strains, sprains, crushed limbs
or fatal injuries result from
people maintaining running
machines
Noise
Noise levels reduced by:
Operator booths
Ear plugs or ear muffs
Supply
Crushers require constant
supply
Conveyers & haul equipment
increase risk
Safe Job
Procedures
PPE
Hardhat
Hearing
Safety Boots
Protection
Respirator
Fall protection
Safety
Glasses
Gloves
Start-Up Inspection
Hazard:
–Slips
–Trips
–Falls
Start-Up Inspection
Safe procedure:
–Housekeeping
–Walkways clear
–Clean up spills
Check Crusher
Hazard:
–Grease & oil leakage
Check Crusher
Safe procedure:
–Inspect for loose bolts & nuts
–Cracks in housing or
supports
Start Crusher & Feed
Hazard:
–Person caught in equipment
–Belt breaking
Start Crusher & Feed
Safe procedure:
–Personnel clear
–Check belts to ensure in good
condition
Watch Trucks Dump
Hazard:
–Material flying & hitting
personnel
–Live explosives
Watch Trucks Dump
Safe procedure:
–Area clear of personnel
–If dynamite or cap observed
in rock, do not try to remove it
–Shut off crusher & feeder call supervisor
Free Large Rocks
Hazard:
–Equipment starting
–Falling rock
–Fall into crusher
–Pry bar slipping
–Eye injuries
–Sledge hammer glancing
Free Large Rocks
Safe procedure:
–Lockout & tagout
–Barricade truck dump
–Use harness & line
–Wear eye protection
–Use short handled hammer in
close places
Signal For Start-Up
Hazard:
–Excess material
–Crush or injure personnel due
to excess material
Signal For Start-up
Safe procedure:
–Make sure crusher empty
before another truck dumps
–Area clear of personnel
Shut Down
Hazard:
–Material left in crusher could
jam
Shut Down
Safe procedure:
–Make sure material clears
crusher & belts before
shutting down

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