Lifting Equipment LTD News

LIFTING MAGNETS

LIFTING MAGNETS

Lifting magnets are the ideal way to lift any ferro magnetic material, they are commonly used in steel works or when steel is regularly handled, particularly plate. Lifting magnets are also used in scrap yards, workshops, warehouses, and construction of jigs and fixtures, and can be used with electric hoists.

We can supply you with the TPM permanent lifting magnet, some details are listed below, please contact us for more information if necessary.

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

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.

AIR GAP:

The high magnetic forces created by the TPM permit the magnet to clamp parts 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 considerable number of different ways such as paint, dust, and heavy mill scale.  Poorly machined surfaces also constitute an air gap. Down rate the magnet capacity in accordance with the adhesive force/air gap diagram below:

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.

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