How Are Lifting Magnets Used

Permanent lifting magnets present an resourceful and cost effective method of lifting difficult ferro-magnetic loads. Lifting magnets are designed to lift, lower and horizontally transport sheet, flat and round steel and furthermore may be attached to any ferro-magnetic steel material.

There are numerous advantages for choosing and using a lifting magnet; the significant advantages are that they really are straightforward to operate and maintain, impart a cost effective way to lift ferro-magnetic objects, they can be set up and utilized by just one person, and they may be employed in most areas since lifting magnets are simple to transport
{Lifting magnets are regularly used in the metal industry, or else where steel is often handled, in particular, steel plate; lifting magnets are in addition used in locations such as ship yards, scrap yards, workshops, and for the construction of jigs and fixtures.

Lifting magnets are in general obtainable with swl maximum capacities up to 2000kgs, and are often used along with an electric or manual hoist or crane, where the lifting magnet hooks on top of the load hook.|A permanent lifting magnet is normally used in conjunction with a crane or hoist of some kind; the magnet merely hooks over the hoists load hook. Lifting magnets are used in a vast array of applications, but most commonly inside the steel business intended for lifting steel plate; they are on the other hand also regularly seen in ship building yards, scrap yards, warehouses and workshops. Permanent lifting magnets are usually obtainable in a variety of capacities, often upto 2000kgs.}

Permanent lifting magnets work by manual operation and are more often than not used individually as they can’t be operated from a distance. These magnets create a very strong but low magnetic field so consequently they might be susceptible to air gaps between the magnet and the load; this frequently signifies that when the air gap increases, the magnetic force will be radically reduced, and so they will work better on smooth, flat surfaces other than rough and irregular ones . Air gaps transpire in a considerable number of different ways for instance paint, dirt, and heavy mill scale. Roughly machined surfaces also constitute an air gap, hence in these circumstances the magnet has to be down rated . Full lifting capacity can only be achieved when the magnet makes total contact with the material being lifted. Because of this it is always advisable to perform a trial lift to make sure the load is safe before the full lifting of the load.

Various materials possess different abilities to carry magnetism. For materials other than mild steel a reduction factor must be used that allows you to assess the effective clamping force.
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 thickness of the material to be lifted is also a further significant aspect to consider when picking a lifting magnet, because when they are used to lift steel plates that are thinner than the suggested lowest possible thickness then the clamping forces will be considerably reduced.

Permanent lifting magnets are tremendously easy to work, to begin with the magnetizing lever needs to be in the off position, then rest on the load, remembering to take in to account the load material, possible air gaps and therefore a reduction in capacity . Whilst the magnet is in the precise location (this should be in line with the centre of gravity) then the magnetizing handle can be placed into the on location, the load is now magnetized and ready to lift, remember to do a trial lift initially. When the lift is complete, and the load has been placed completely and securely down, then the hand lever can be moved to the off position to discharge the load.

Here i will discuss some important guidelines for the correct and safe operation of a permanent lifting magnet;

Lifting magnets are designed to lift, lower and horizontally transport sheet, flat and round steel and additionally may be attached to any ferro-magnetic steel material.
A load held by the lifting magnet shouldn’t be left unattended for extended periods. You should raise, lower and move loads little by little and carefully if longer sheets of steel are to be used it may be essential to use 2 magnets to prevent wavering or deflection of the load. In this instance the magnets need to be used in conjunction with a spreader beam.

Always make sure that the crane or hoist hook is an appropriate shape and size for the suspension eye on the magnet. Additionally it is imperative to note the safe working load limit and by no means exceed it.
You must by no means lift or transport loads whilst any persons are in the lifting zone, nor allow people to pass beneath a suspended load. During the moving of a load make sure the load does not swing or bang other items, make certain the path free of objects/persons before lifting. Never de-magnetize the magnet before the load has been totally set down, and do not magnetize the magnet before the load has been attached.

When lifting round materials like pipes etc. As they won’t formulate complete contact with the magnet then the capacity will be lowered.
It needs to be noted that these permanent lifting magnets should never be used around medical units, and those with pacemakers, or insulin pumps.

Main inspections as well as servicing of lifting magnets is required to be applied on a yearly basis, yet it is recommended to examine the magnet before every procedure, to test for any flaws for example cracked housing or components, defective or loose hand levers and suspension eyes, and also the lifting contact surface is required to be clean. Additionally it is common practice to examine the load to be lifted for just about any dust or debris, and rough or uneven surfaces which can create an air gap therefore a reduced capacity.

I hope that this article has provided some practical information about why, how and when to use a permanent lifting magnet.