GT PML-1 Instruction Manual

Operating Instructions
& Safety Manual
Plate Capacities
0.1 through to 6 tonnes
Note: Operator must read and fully
understand the operating instructions
before using this product.
Permanent
Magnet Lifter
Manual
www.gtlifting.co.uk
George Taylor & Company Lifting Gear (Midlands) Ltd.
Unit 4, Fryers Road, Walsall WS2 7LZ UK
T+44 (0)1922 490220 F+44 (0)1922 490229 E[email protected]

2
APPLICATION & FEATURE
Model PML (Permanent Magnetic Lifter) is mainly used
to fasten or hold steel/iron workpieces during lifting or
handling operations. It is capable of holding steel/iron
plate and cylindrical steel.
They are widely used as hoist devices in factories but
are safe and convenient in many other workplaces. easy
and safe in operation, convenient for carrying goods
at docksides, warehouses and within commercial and
transportation industries.
By using them, you can improve working environments
and practices and enhance efficiency greatly.
CONSTRUCTION
PML has a strong magnetic circuit produced by
Neodymium Iron Boron (NdFeB) magnetic materials. The
ON or OFF of the magnetic circuit is controlled by turning
the main handle. There is a locking key in the handle to
offer safe control and a V slot on the bottom surface for a
cylindrical workpiece to be held in place.
SIGNAL WORDS
Note use of the following signal words DANGER,
WARNING & CAUTION with safety messages
The appropriate signal word for each has been
selected using the following guidelines:
Indicates an imminently hazardous situation that, if not
avoided, will result in death or serious injury. The signal
word is to be limited to the most extreme situations
typically for machine components which, for functional
purposes cannot be guarded.
Indicates a potentially hazardous situation that, if not
avoided, could result in death or serious injury, and
includes hazards that are exposed when guards are
removed. It may also be used to alert against unsafe
practices.
Indicates a potentially hazardous situation that, if not
avoided, may result in minor or moderate injury. It may
also be used to alert against unsafe practices.
Every year many accidents occur which could have
been avoided by a few seconds of thought and a more
careful approach to handling equipment. You, the
operator can avoid many accidents by observing the
following precautions in this manual. To avoid personal
injury, study the following precautions and insist those
working with you, or you yourself, follow them.
Replace any Caution, Warning, Danger or Instruction
safety label that is not readable or is missing.
Do not attempt to operate this equipment under
the influence of alcohol or drugs. Review safety
instructions with all users.
Operator should be a competent person.DO NOT
ALLOW PERSONS TO OPERATE OR ASSEMBLE
THIS UNIT UNTIL THEY HAVE DEVELOPED A
THOROUGH UNDERSTANDING OF SAFETY
PRECAUTIONS AND HOW IT WORKS.
Never exceed the limit of a life. If it’s ability to do a job, or
to do so safely is in question - DON’T TRY IT.
CAUTION
General Information
DANGER
WARNING

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Safety Information
OPERATION
Before any use or operation, you should clean the surface
of the workpiece being lifted and ensure that the bottom of
the lifting magnet is free of any dirt or debris; such as rust
and or metallic burr.
Place the lifter on the surface of the workpiece and make
sure the centreline of the lifter and the workpiece overlap
clearly. Then turn the handle from OFF to ON until the inner
slide key of handle passes the lifter’s stop pin.
Make sure the handle’s inner slide key is automatically
locked by the stop pin. Only after all these instructions
have been followed should the operator begin to use the
lifting magnet.
During any lifting and handling operation, overloading is
totally prohibited. It is also forbidden to pass underneath
or stand under the workpiece that is being held by the
magnetic lifter. The temperature of the workpiece and the
surrounding area should be between no less than -40°C or
no more than +80°C. It is unsafe to use the lifter in an area
where heavy vibration could occur or in an area that could
cause an impact to the lifter during the course of use or
during a lifting operation.
When lifting cylindrical workpieces, ensure the workpiece
is in contact with the lifter’s V slot lines. The capacity for
cylindrical iron/steel is generally only 30% of the unit’s
rated capacity for standard flat plate e.g. plate capacity
W.L.L. 100 KGS would equate to cylindrical capacity W.L.L.
30 KGS.
After every lifting or handling operation is finished, press
down the button of the handle to disengage the slide key
from the stop pin and accordingly turn the handle from
ON to OFF until it is released. At this point the lifter is in a
neutral condition and it can be safely taken away from the
workpiece that was being lifted.
MAIN FACTORS FOR SAFE USE
THE THICKNESS AND SURFACE OF THE WORKPIECE IS
CRITICAL
Before EACH AND EVERY operation, it is necessary to
find out its effective capacity of the lifter depending
on the thickness of the item being lifted. According to
STEEL THICKNESS percentage curve on the chart on this
instruction guide, the user should determine the capacity
and assess the lift requirement. Also care should be
taken to make a clear estimate to determine the effective
capacity of the lifter depending on the workpiece surface
condition according to the AIR GAP percentage curve
detailed in the chart on this instruction guide.
For assistance with the surface quality, if the roughness
(Ra) is less than 6.3um, the effective lifting capacity can be
as the maximum 100%. However, if the surface roughness
(Ra) is above 6.3um or even worse, the air gap between
the lifter and workpiece should be closely calculated and
estimated to affect the lifting capacity.
To find out the effective capacity of this AIR GAP please
closely study the AIR GAP curve percentage chart on this
instruction guide. Combining both factors then calculate
the actual lifting capacity on this condition. The curve is
also printed on both sides of each magnetic lifter.
CRITICAL SAFETY CONSIDERATIONS FOR
LIFTING ANY WORKPIECE
Taking the magnetic lifter’s capacity in hand, it should
be considered for low-carbon steel plate as the usual
standard which has the coefficient 1.
After measurement and careful analysis, the capacity
coefficient:
• Medium-carbon steel = 0.95
• High-carbon-steel = 0.90
• Low-alloy steel = 0.75
• Cast Iron = 0.50
WARNING
CAUTION
WARNING
CAUTION
WARNING

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Before using the magnetic device, please carefully consider all risk assessments of any lift taking place. Take care to read
the operating instructions in full, in order to prevent and avoid any accident.
Care to be taken to avoid any impact or bump of the magnetic lifter when out of service. Internal damage could occur which
will probably affect its lifespan but could also cause potential for lifting in an unsafe manner.
Never bump the magnetic lifter handle or damage the workpiece holding contact surface. When not in use it is good and
safe practice to protect the magnetic lifter holding surface area by applying anti-rust oil.
Maintenance &
Safety Notice
STEEL THICKNESS
(mm)
AIR GAP
(mm)
PML-60
PML-50
PML-30
PML-20
PML-15
PML-10
PML-6
PML-5
PML-3
PML-2
PML-1
100
90
80
70
60
50
40
30
20
10
0
25%
50%75%100%
PML-60 PML-50
PML-30
PML-20
PML-15
PML-10
PML-6
PML-5
PML-3
PML-2
PML-1
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
25%
50%75%100%
Thickness
(mm)
Effective percentage of rated capacity
PML-60
PML-50 PML-30 PML-20 PML-15 PML-10
PML-6
PML-5 PML-3 PML-2 PML-1
100 100% 100% 100% 100% 100% 100% 100%
90 85%
80 70%
70 55% 80%
60 45% 60% 80%
50 35% 45% 60% 90%
40 25% 35% 45% 75% 90%
30 - 25% 30% 55% 70% 90%
20 - - 20% 35% 50% 70% 80%
SAFETY CAPACITY CURVE
Safety Capacity Data for Thickness (Reference)

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• Inspect the handle frequently and before each lift, to make sure its slide key can move easily and is flexible. The top
pin should always be able to lock firmly. This should be checked prior to each lift.
• It is strictly forbidden to turn the magnetic lifter’s handle without the iron/steel workpiece being in contact with its
intended holding surface.
• Users should be trained and competent people, who must have read and understood these safe use instructions.
Maintenance must be executed by authorised or professional technicians, who must strictly follow the instructions
and guidelines.
• It is forbiden to modify the magnetic lifter in any way.
• The magnetic lifter should be inspected and tested with data recorded at least once every year and/or to suit the legal
requirements of the working country of use.
• If its main body shows any visible signs of damage or any of the moving parts are damaged in any way, then the unit
should be removed from service and destroyed to avoid any possibility of future use.
Maintenance &
Specifications
WL
I
H
Part No. Plate
Capacity
kgs
Cylindrical
Capacity
kgs
Tear-off
Force kgs
H
mm
I
mm
L
mm
W
mm
Weight
kgs
PML-1 100 30 350 70 142 92 64 3
PML-3 300 100 1,050 96 176 165 88 10
PML-6 600 200 2,100 120 219 236 118 24
PML-10 1,000 300 3,500 168 266 264 168 50
PML-20 2,000 600 7,000 217 462 378 230 125
PML-30 3,000 1,000 10,500 265 567 453 290 220
PML-50 5,000 1,500 17,500 265 707 647 290 355
PML-60 6,000 2,000 19,200 265 707 713 290 398

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Spare Parts Diagram & List
Front Covering Plate
Stop Pin
Bolt
Axis Cap
Handle
Bearing Housing
Bearing
Axis
Shackle Pin
Lifting Dee Shackle
Model Plate
Body
Back Covering Plate

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www.gtlifting.co.uk
George Taylor & Company Lifting Gear (Midlands) Ltd.
Unit 4, Fryers Road, Walsall WS2 7LZ UK
T+44 (0)1922 490220 F+44 (0)1922 490229 E[email protected]