LIFTING MAGNETS

Posted : Thursday 16th December 2010

LIFTING MAGNETS

If you ever need to lift heavy object made from ferro- magnetic material quickly and easily, then a lifting magnet could be the answer .

The main benefit of using permanent lifting magnets is that they are easily transportable plus can be used more or less anywhere; they are uncomplicated to use, have low maintenance costs, and are economical to purchase.

Lifting magnets are used in a wide range of areas, in particular steel works, or where steel is handled on a regular basis, they are also used in workshops and warehouses,  ship yards, scrap yards, as well as the construction of jigs and fixtures, and unloading sheet steel; they are ideal for use with lifting hoists.

Lifting magnets can be sensitive to air gaps between the magnet and the load, this can affect the swl and safety of the lift;  this typically means that when an air gap increases, the magnetic force will be considerably lowered. It is also worth being aware that lifting magnets can lift minimum thicknesses of material, not just maximum thicknesses.

Below is some information about the TPM model permanent lifting magnet and how they work:

THE MATERIALS THICKNESS:

If ever TPM  Lifting magnet is used to lift plates thinner than the suggested minimum thickness, the clamping forces will be considerably lowered.            

THE TYPE OF MATERIAL:

Various materials contain different capabilities to carry magnetism. For materials apart from mild steel a reduction factor is required to be used   so that the effective clamping force can be determined.

STANDARD 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

 

THE CONTACT AREA:

The full lifting capacity  of the lifting magnet can only be accomplished if the magnet makes full and total contact with the load being lifted, If the contact surface (i.e. sheet steel) has holes in or maybe has an uneven, distorted or rough surface then the performance will be affected accordingly.

You should always carry out a trial lift, (slightly raised)  in these circumstances to confirm that the load is safe and correct  prior to completing the transport of the load to its intended destination.

SOME FACTORS THAT REDUCE THE MAGNETIC CLAMPING FORCE ARE;

AIR GAPS;

The high magnetic forces that are produced by the TPM permit the magnet to clamp components throughout the air gap, nevertheless air gaps will  reduce the magnetic performance since they supply a barrier amid the contact surfaces.

Air gaps can occur in various ways such as paint, dust, and heavy mill scale;  surfaces which have not been machined very well can also constitute an air gap. You should down rate the magnets capacity accordingly, as recommended.

        

REMEMBER, ALWAYS CARRY OUT A SLOW TRIAL LIFT  BEFORE MOVING THE LOAD COMPLETELY.

 

 

 

                    

 

                   

Tagged as: lifting magnet, lifting magnets

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