Lifting Gear Direct
Fens Pool Avenue, Brierley Hill
West Midlands DY5 1QA
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Lifting Gear Direct LTD News
LIFTING MAGNETS
Posted : Thu 8th Jul 2010 @ 11:09LIFTING MAGNETS
If you need to lift heavy object made from ferro- magnetic material quickly and easily then lifting magnets could be the answer .
They are used in a wide range of areas, in particular steel works, or where steel is handled regularly, they are also used in workshops and warehouses, ship yards, scrap yards, loading and unloading machinery as well as the construction of jigs and fixtures, they are ideal for use with lifting hoists.
Below is some information about the TPM permanent lifting magnet and how they work:
MATERIAL THICKNESS:
If the TPM is used to lift plates thinner than the recommended minimum thickness, the clamping forces will be significantly reduced.
Performance curves can be identified in conjunction with the adhesive force/ flat thickness diagram.
MATERIAL TYPE:
Some materials have different abilities to carry magnetism. For materials other than mild steel a reduction factor must be applied in order to calculate the effective clamping force.
TYPICAL VALUES: Ferrous alloy steels: 0.8 EXAMPLES OF REDUCED SWL: Mild steel 500g
High carbon steels: 0.7 Cast iron 500g x 0.55 = 275kgs
Cast iron: 0.55
CONTACT AREA:
Full lifting capacity can only be achieved when the magnet makes full contact with the item being lifted, If the contact surface has holes in or is uneven then the performance will be affected accordingly.
Always carry out a trial lift in these circumstances to establish correct lifting before transporting the load.
FACTORS THAT REDUCE THE MAGNETIC CLAMPING FORCE:
AIR GAP:
The high magnetic forces created by the TPM allow the magnet to clamp components through the air gap, but air gaps will however reduce the magnetic performance as they provide a barrier between the contact surfaces.
Air gaps occur in a number of different ways such as paint, dust, and heavy mill scale. Poorly machined surfaces also constitute an air gap. Please down rate the magnet capacity accordingly.
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