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Handling of coiled strip and sheet material in steelworks, cold rolling mills and downstream processing. The task is usually solved with a mandrel or C-hook, because the coil allows a form-fit pick-up. Critical points are edge protection, centre of gravity and securing against unrolling.
A coil is wound strip – a cylinder with a hole in the middle, the eye. That eye is the advantage: it allows the coil to be picked up by form fit rather than clamped or held by suction. The drawbacks are the strip edges, which carry any point load as damage into many wraps, and the tendency to roll.
The range runs from the narrow slit coil that a lifting aid moves at the workstation to the hot-rolled coil of many tonnes that belongs to the crane alone.
A coil lies either with its axis horizontal – eye to the side – or with its axis vertical on a pallet, eye to the sky. The decoiler of a press or straightening line normally requires the horizontal axis.
If coils arrive eye to the sky and are processed eye to the side, they have to be turned through ninety degrees. This is the most demanding step in the whole chain: the centre of gravity shifts and the coil wants to roll off over its edge. It belongs in a device with a guided tilting motion or on a coil upender, not on two slings.
The C-hook enters the eye of the horizontal coil with its lower arm and carries it from inside. The mandrel does the same on a rigid arm and allows the coil to be pushed straight onto the decoiler. Coil tongs grip the upright coil from above through the eye or around the circumference.
Common to all of them: the support in the eye has to be wide enough that the innermost wraps do not buckle, and the centre of gravity of the coil has to lie below the suspension point, otherwise the load hangs at an angle.
Most damage occurs not during lifting but when setting down and storing.
What Entracon offers here is on the matching page.
See what we offer| Attachment | Coil orientation | Typical use |
|---|---|---|
| C-hook | horizontal axis, eye to the side | crane transport, storage, transfer to the decoiler |
| Mandrel on a rigid arm | horizontal axis, eye to the side | guided loading onto the decoiler |
| Coil tongs | vertical axis, eye to the sky | lifting off the pallet, stacking |
| Tilting gripper or coil upender | both | turning between upright and horizontal |
Slit coils and smaller coils, yes – precise loading onto the decoiler in particular is a strength of the rigid arm. Heavy coils remain a job for the crane with a C-hook or tongs. Where the limit lies follows from the capacity and reach of the device.
Because they concentrate the load on a narrow line at the inner and outer edge. The strip edges buckle, and the damage runs through all the wraps affected. A wide mandrel or C-hook spreads the load over the surface of the eye.
By form-fit storage: cradles, saddles or wedges on both sides. The securing is part of the storage location and has to be in place before the lifting attachment is released.
One short conversation usually settles more than three quotations. Call or write — you will reach an engineer directly.
Start typing – for example “balancer”, “SAP” or “pipe stress”.
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