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PERMANENT MAGNETS LIMITED Phone no: +91 22 29452121-27 Fascimile: +91 22 29452128 Email: sales@pmlindia.com |
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Lifting
Magnets
Permanent Magnet Lifter – Small, Light & Strong in
lifting.
|
Model |
Rated lifting strength (kgs) |
Cylindrical lifting strength (kgs) |
Flat surface lifting strength (kgs) |
L |
B |
H |
R |
Permissible Operating Temp. (°C) |
Dead weight (kgs) |
|
811-0 |
100 |
50 |
300 |
92 |
65 |
67 |
107 |
< 80 |
3 |
|
812-0 |
300 |
150 |
900 |
162 |
92 |
91 |
207 |
< 80 |
8 |
|
813-0 |
500 |
300 |
1500 |
236 |
121 |
117 |
276 |
< 80 |
18 |
|
814-0 |
1000 |
500 |
3000 |
270 |
180 |
164 |
285 |
< 80 |
50 |
|
816-0 |
2000 |
1000 |
6000 |
378 |
234 |
212 |
370 |
< 80 |
135 |
|
817-0 |
3000 |
1500 |
9000 |
600 |
270 |
261 |
450 |
< 80 |
185 |
Features:
·
Does not need
Electrical Energy.
·
High
effort/weight ratio.
·
Safety factor of
3 (Rated capacity to Actual test load).
·
Convenient to
use.
·
Test certificate
for safety factor from third party.
·
The Magnetic
Lifters are ruggedly built.
·
No Maintenance
and Operating cost.
·
Made with high
energy rare earth magnets (NdFeb).
·
Mechanical
Switching by turning a lever with a locking.
·
System against
switching off accidently.
·
No damage to the
work piece being lifted.
·
Easily
transportable.
Principles:
These
are two Pole Permanent Magnetic Lifters. The two poles are at the bottom of the
lifter. These lifters use high grade NdFeB Magnets for producing strong
magnetic flux path through the two poles. The lifter is placed on the MS
flat/block that is to be lifted. The turn of the handle in its ON position with
MS flat/block/cylinders (to be lifted) at the bottom ensures completion of
magnetic flux path through the MS body. The MS body gets attached to the
lifter. The turn of the handle in its OFF position detaches the MS body from
the magnetic lifter.
Application:
The
magnetic lifters are used for loading/unloading and movement of objects within
the factory premises. These can hoist iron sheets / blocks and cylinders. Due
to its light weight, small size and high effort/dead weight ratio, these
lifters find its use in MS fabrication, machining, steel rolling
mills/industries, ship yard, warehouses, docks, press tool and plastic
injection molding industries, and factories.
Benefits:
·
More effective use of
available floor space by eliminating gauging and increasing stacking height.
·
Huge & heavy
work pieces can be moved and handled safely & easily by a single Operator.
·
Labor saving, time
saving - improving productivity.
Important factors for the
safe operation of lifting device:
Load
characteristics other than just weight must be considered in order to determine
the weight that any magnetic lifter can lift. This statement is true for any lifting
magnet because they all operate on the same fundamental laws of Physics.
Magnetic power is pictured as lines of force flowing from North to South Pole.
Anything that limits the flow of these magnetic lines of force obviously
reduces the magnet’s lifting ability. There are four important factors which
limit the flow of these lines of force.
1.
LOAD SURFACE
CONDITIONS:
Magnetic
lines of force do not flow easily through air, they need iron in order to flow
freely. Therefore, anything that creates an air gap between a magnet and the
load, limits the flow of magnetic force and thus reduces the lifting capacity
of a magnet. Paper, dirt, rust, paint and scale act in the same way as air, so
also a rough surface finish between the magnet and the load.
2.
LOAD LENGTH OR WIDTH:
When
the length or width of a load increases, it ceases to lie flat and the load
begins to drop at the edges. The drooping/sagging of the load can create an air
gap between the load and the magnet. If this occurs then the lifting capacity of
the magnet is reduced.
3.
LOAD THICKNESS:
Magnetic
lines of force are more effective when they flow through iron instead of air.
The thicker the load, the more the lines of magnetic force. After a certain
thickness of load, no more lines of force will flow because the magnet has
reached its full capacity. Thin material (load) means less iron available and
thus fewer lines of magnetic force flow from the magnet into the load.
Therefore, the lifting ability of the magnet is reduced. Every magnet is rated for
minimum thickness of load to reach full lifting capacity. Below such thickness
of load will de rate the lifting capacity of the magnet. In general, it can be
said the load must be thicker than the width of one of the magnet poles.
4.
LOAD ALLOY:
Low
carbon steels, such as soft Iron or Mild Steel are nearly as good conductors of
magnetic lines of force as pure iron. However, if the alloys contain
nonmagnetic materials, they decrease the ability of magnetic lines of force to
flow into the load. An alloy such as ANSI304 of Stainless steel is almost as
poor conductor of magnetic force as air.
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