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Separating the top part from a stack of like parts. With sheets, panels and nested containers this is harder than it sounds: oil, trapped vacuum and interlocking make two parts stick together. The usual answers are offset suction cups that angle the part, strippers, or double-sheet detectors that catch the wrong pick before it does damage.
In a stack, identical parts lie face to face. Between oiled sheets the oil film acts like an adhesive; between smooth panels a vacuum forms on lifting; tapered containers wedge into each other; carton blanks catch at the edge.
The result is the double pick: the gripper lifts two parts and the second one drops at some point – onto the stack, the floor or into the machine. Destacking is therefore less a matter of lifting than of separating.
Which aid works depends on the material and on the cause of the adhesion. Several are often combined.
A full stack often starts above chest height and ends at the floor. By hand this means reaching above shoulder height at the start and bending deeply at the end – both unfavourable postures, repeated with every stack.
A lift table keeps the pick height constant. A lifting aid compensates for the height through its lifting stroke and takes the weight as well. For sizing, the full range governs: highest pick with the full stack, lowest with the nearly empty one.
At presses and sheet metal machines with high volumes, automatic destacking is state of the art – with separating aids and double-sheet detection as fixed components. It requires consistent stacks in a defined position.
With changing formats, mixed stacks or small batches, the operator destacks with a hand-guided device. They see the double pick and resolve it before it becomes a problem. The gripper has to allow the part to be angled for this.
What Entracon offers here is on the matching page.
See what we offerDestacking separates identical parts lying face to face – sheets, panels, containers. Depalletising removes layers of several packs standing side by side from a pallet. In destacking the difficulty is separation; in depalletising it is the layer pattern.
In automatic systems by double-sheet detection, which checks the thickness or weight of the part picked up. In hand-guided work the operator detects it – by the weight the device displays or that they feel, and by looking at the edge.
Rarely with any reliability, because the wedging force in the stack can exceed the holding force and the lower container comes along. The usual solution is a gripper that holds the top container at the rim and retains the next one.
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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