Webinar Series - Amazon S3 · Webinar Series Presented By: Aaron Yoder, PhD ... Tips on effective...
Transcript of Webinar Series - Amazon S3 · Webinar Series Presented By: Aaron Yoder, PhD ... Tips on effective...
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Webinar Series
Presented By: Aaron Yoder, PhD
Associate Professor, UNMC/CS-CASH
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Machine Guard MakeoverTips on effective machine guarding
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Employee Rights
Employees are entitled to:
Safe & healthy working conditions
Fair compensation for all hours worked
Report unsafe conditions without retaliation
Employers are responsible for providing a
safe workplace.
Info at www.osha.gov & www.whistleblowers.org
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There are a variety of potential machine
hazards present in grain handling. Sound
machine guarding and safeguarding practices,
together with an effective energy control
program (lockout/tagout), can help employers
to control these hazards. This overview covers
the fundamental principles of machine
guarding and safeguarding, and the related
OSHA General Industry Standards.
Course Overview
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At the end of this session, participants will be
able to:
Summarize core principles of general
machine guarding & safeguarding
Identify machine guarding hazards in the
workplace
Apply corrective actions and prevention
strategies to hazards
Webinar Objectives
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Machine Hazards -
Overview
Guarding Principles
◆ What makes a guard
effective
Identifying Hazards at
Work
Makeover - Successful
Correction &
Prevention Strategies
Topics/Sections Covered
UNMC
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Machine Hazards
Overview
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Importance of Machine Guarding
Machine related injuries – often severe or
fatal
◆ Crushed hands/arms, feet/legs
◆ Severed fingers, limbs
◆ Blindness
Preventable & needless
Wikiwand
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Where Machine Hazards Occur
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Point of Operation
Power transmission
apparatus
Moving Parts
GHSC
If it moves and could cause injury it MUST
be guarded.
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Point of Operation
Where work is
performedCut, shape, bore, and
form stock (material)
◆ Move material (auger)
Danger
◆ Cannot always be
guarded
◆ Does not differentiate
Material vs body part
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Power Transmission Appartus
All mechanical components that transmit
energy to part of machine performing
workComponents
◆ Flywheels
◆ Pulleys, belts
◆ Chains, cranks, gears
◆ Connecting rods
◆ Couplings
◆ Cams, spindles 11
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Moving Parts
Parts of a machine that move while
machine is working.
Reciprocating, rotating, transverse
movement
Feed mechanisms & auxiliary parts
Unguarded Fan
Unguarded Conveyor
12Unguarded Leg Feed
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Types of Machine Hazards
Pinch point
Wrap point
Pull-in point
Shear point
Crush point
Burn point
Free wheeling part
Stored Energy
Thrown objects
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UNMC
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Pinch Point
Two machine parts move together and
one of the parts moves in a circle.
Power transmission
systems
Belt drives, chain
drives, gear drives
UNMC
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Wrap Point
Any rotating machine part such as shafts
or rods. Example: PTO
Wrap in direction
shaft turns
Hazard increases
with damaged/dirty
shaft
No time to reactPTOs - oldest, most common machinery
hazards.15
Wikimedia
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Wrap Point Hazard Protection
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Pull-in Points
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Operating point catches object & drags it
in. Mechanisms that take in crops or other
material for processing
◆ Conveyors
◆ Feed rolls
◆ Feed chambers
◆ Grinders
◆ Harvest EquipmentDrag Conveyor
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Shear Point
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Two parts move across or close enough
together to cut or move soft material.
Cuts from force & speed
◆ Augers, blades
EX: Hedge trimmer
Difficult to guard
High speeds make operation less visible.
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Crush Point
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Two objects move toward each other OR one moves toward a fixed object and the gap between both decreases.
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Burn Points
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Hot mufflers, engine
blocks, pipes, and
fluids (fuel, oils,
chemicals)
Exposure - machine
inspection, servicing,
maintenance
Place hand near surface to test for heat.
Nobel Research Institute
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Machine parts
continue to move
after power has
been turned off.
Cannot bring
rotational force to
sudden stop.
EX: Conveyor
Freewheeling Parts
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Thrown Objects
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Formed by rotating fan or knife blades
used to cut, grind, or chop materials
Normal machine operation
discharges materials into
surrounding area
◆ EX: rotary mower.
Keep work area clear of others.
Wear eye protection.
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Stored Energy
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Confined energy is unexpectedly & uncontrollably released.
Pressurized systems &
components
◆ Mechanical, hydraulic,
pneumatic,
gravitational
Capacitors, springs,
flywheels
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GUARDING
What do you need to look for
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Purpose of Guarding
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Protect operator & others from hazards
created by normal machine operation.
ANY machine part, function or process
which might cause injury must be
safeguarded.
◆ Operation of machine
◆ Accidental contactHazards MUST be controlled or
eliminated.
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How a Guard Should Work
A Machine Guard should:
Prevent contact Secured to machine
(not easily removed or tampered with)
Protect from falling objects
Not create new hazards
Not interfere with job
performance
Not have to be removed to
lubricate machine
Easy access for maintenance
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AUTO Protection
Guards should follow AUTO. Protect a worker from reaching:
round
verhroughnder
Open area in guard does not follow AUTO Principle.
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Types of Guards
Fixed
6 Sided Guards
Interlocked
Adjusting
Self-Adjusting
Guarding Devices
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Fixed Guarding Methods
Fixed Guard 6 Sided Guard
Permanent fixture
Need tool to
remove
Best/First choice
Protects all 6 sides
◆ Top, bottom
◆ Front, back
◆ Left, right
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Guard covers
belt & pulley
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Interlocked guard
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Shuts off or disengages power when the
guard is opened or pushed out of
positionSenses absence or
presence of guard
Can be circumvented
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Adjustable Guards
Adjustable Self-Adjusting
Operator adjusts
guard
Guard is attached
Partially guarded
when operating
Guard moves/adjusts◆ Material pushed
into point of
operation
OSHA Wikimedia
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Guarding Device
Pressure Sensing Location/distance
Interrupt operating
cycle
Prevent entry into
area
Prevents access to
hazard
◆ Physical barrier point
of operation
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Grates/Guards – Opening Size
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Must not reach hazard with body or tool.
1910 Subpart O
◆ Mechanical power
press standard
Opening size =
distance of worker
from hazard
◆ Farther from hazard,
larger the opening
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Guard Makeover
Protecting Workers from Hazards
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Preventing machine-related hazards• Learn how various methods of machine guarding protect
employees.
• Learn the regulatory requirements for machine safeguarding.
• Identify and categorize the mechanical hazards at your facility.
Develop a list of those hazards and their locations.
• Match the hazards with the safeguards that your facility uses.
• If the safeguards do not meet the minimum general
requirements, upgrade your machine guarding systems as
soon as possible. If the hazard is severe enough, you may need
to shut down the machine until appropriate safeguards can be
put into place.
• When purchasing new equipment, ensure that the
manufacturer provides appropriate machine guards.
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Train employees to ID hazards
Learn methods of machine guarding
Learn the regulatory requirements
Identify & categorize mechanical hazards
◆ Note locations.
Match hazards with safeguards facility uses.
Upgrade machine guards not meeting
requirements.
Ensure new equipment has appropriate
guards
Preventing Hazards
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Guard Makeovers
• What is the task
• What machine/equipment
• What is the machine/equipment doing
• How & where do you interact with the
machine
• Where should the guard be
• What guard would work best
• What can be done to improve
• What should you consider (blocking a
walkway, etc)
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Tractor Mounted Conveyor
Protruding
auger
No master shield on tractor
PTO without proper shield
Unguarded horizontal auger
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Unguarded Conveyor
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Unguarded Shafts
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Unguarded Pulleys, Belts, Chains
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Makeover – Power Transmission
#2 BAD#1 REALLY BAD
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Makeover – Power Transmission
#4 BEST#3 BETTER
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Makeover –Portable Auger
#1 BAD #2 SLIGHTLY BETTER
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Makeover – Portable Auger
CAES Univ. of Georgia
#3 BEST
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Makeover - Fan
#1 BAD
#3 SLIGHTY BETTER
#2 BAD
#4 SLIGHTLY BETTER
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Makeover - Fan
#5 BETTER #6 BEST
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Makeover - Conveyor
#2 BAD#1 BAD
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Makeover - Conveyor
#3 BEST
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Makeover – Unloading Auger
#1 BAD
#2 BETTER
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Makeover – Unloading Auger
#3 BETTER #4 BEST
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Makeover – Sump Guards
#1 BAD#1 BAD
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Makeover – Sump Guards
#4 BETTER#3 GOOD
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Makeover – Sump Guards
#5 BEST
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Makeover – Sweep Auger
#1 BAD #2 MARGINAL
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Makeover – Sweep Auger
#3 Try But Fail
#1 BAD
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Makeover – Sweep Auger
#6 BEST
#5 BEST
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Makeover – Pinch Points
#1 BAD #2 BETTER - ACCEPTABLE
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https://www.osha.gov/SLTC/etools/machineguarding/index.html
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https://www.osha.gov/laws-regs/regulations/standardnumber/1928/1928.57
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https://www.osha.gov/harwoodgrants/grantmaterials/
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https://www.osha.gov/harwoodgrants/grantmaterials/bytopic/#m
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SUMMARY
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Ensure Guards are in place
LOTO –Before any service, maintenance
Best Practices
◆ No loose clothing, unfastened hair
◆ Wait for machines to completely stop
◆ Never step over a running PTO
◆ Never reach over running machines
Guarding & LOTO will prevent the
majority of all machine injuries.
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Disclaimer
This material was produced under grant
number (SEE NOTES) [and revised under
SH05033-SH8] from the Occupational Safety
and Health Administration, U. S Department of
Labor. It does not necessarily reflect the views
or policies of the U. S. Department of Labor,
nor does mention of trade names, commercial
products, or organizations imply endorsement
by the U. S. Government.
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Protect our most valuable resource
Our Workers!
For more information visit grainsafety.org or
StandUp4grainsafety.org