LIFTING ATTACHMENTS | PRODUCTS
running through them to pick up and hold their loads, and the current must run all the time the load is in the air. They therefore consume a large amount of power. A recent development is the so-called electro-permanent magnetic lifter. The design has a clever arrangement of hard iron (i.e. permanent magnets) and soft iron (i.e. non-permanent ones) arranged in a ring with a coil wound round the soft iron component. The result is a combination of permanent and electromagnet that can be switched on with just a single short pulse of electricity – and that remains switched on even after the electric pulse has ceased. The great advantage is that they use so much less electricity – the pulse lasts less than a second, after which the magnetic field remains on and active. A second short pulse, in the other direction, reverses the polarity of the electromagnetic part of it resulting in a net-zero magnetic field and the release of the load. This means that these magnets do not need electric power to hold loads in the air, and in case of power failure, the load will remain attached to the
magnet. Electro-permanent lifting magnets appear as battery-powered models and as mains electricity versions. In the UK, Lifting Safety of Leeds offers models with capacities of 1,250kg to 2,400kg. Spanish company Airpes (now part of the Crosby Group) has a modular electro-permanent magnet system thaat allows an increasing or decreasing number of magnets according to the needs of each lift. The system also allows pre-programming to adapt the magnets to the type or shape of object or material that needs to be lifted – a plate, a pole a coil, or round or flat objects. The lifting beams that support the magnets are custom-designed and can be telescopic (hydraulic or mechanically operated) or fixed beams. They can be adapted to high service
factor plants, harsh environments such as high temperatures, and can be upgraded to perform extra functions such as data collection, integrated load weighing and wireless transmission. That might perhaps have begun
to scratch the surface of devices that you can attach below your hook. The
R Green LEDs show the eTrack lifting clamp from Elebia is ready to lift
conclusion would be that whatever your load, and however awkward it may be to handle, there is, somewhere out there, an attachment that will lift it. ●
R Airpes electro-permanent magnet needs only a short burst of current 38 | December 2022 |
www.hoistmagazine.com
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