Weight and size:
The maximum weight of roll that can be picked up is limited only by the inside diameter of the roll relative to its length. For example the maximum weight for a roll with a 3” ID and a length of 60” is limited by the strength of the shaft that could be inserted inside. A 6” ID roll with a length of 30” could have a much larger weight. Roll weights up to 2000 lb can be handled, dependent on the roll ID. Heavier rolls can be lifted with custom shafts.
Safety: If air pressure is lost while the roll is hung, a pilot-operated check valve will hold the load long enough to bring it to the floor. The structure of the roll handler has a safety factor of about 3:1.
The roll handler can be hung from a cranes
or from a manipulators
. When a roll handler is hung from a crane and 90 degree tilting is required, a load leveler can be added depending on the size and weight of the roll. The load leveler is a device that actively moves the crane hook point under pneumatic power to level out the roll after tilting.
When rolls are lifted with a manipulator (as in the photos here) handling is very convenient because the roll can be brought to a perfect horizontal or vertical position regardless of the size or weight of the roll, and regardless of where the center of gravity of the roll has moved to. Manipulators
can also reach underneath other rolls in an array in an unwind machine. They also float the load, so that up/down pushbuttons are not required.
Extremely heavy rolls: Rolls that weigh several thousand pounds (that do not have to be rotated) can be lifted by inserting shafts in either end of the roll.
Shaft Length: The length of the roll handler’s shaft can be varied by pulling a pin and swapping shafts.
Loading Mandrels: Special consideration should be given to the tight clearances between the ID of a roll and the diameter of the unwind mandrel that the roll is being loaded to (or unloaded from). If the loading is being done with a crane, it may be very easy to bind the roll on the mandrel. It may not be obvious whether it is necessary to press up or down on the crane pendant, possibly worsening the binding. However, if the roll is suspended from a manipulator, shown above, and the roll weight is less than 300 lb, the manipulator can ‘float’ the load, without up/down pushbuttons. The weight of the roll is perfectly balanced by the manipulator arm. In this situation, the operator moves the roll up and down by pulling on the handlebars, and can ‘feel’ the roll slide over the mandrel. Binding is almost impossible because the roll can never be forced upward or downward against the mandrel, except to the extent that the operator can with his own hands.
Mobile Roll Handling:
If there are many machines to be loaded, separated by some distance, then the roll handler can be mounted on a crane with long travel. Or, the roll handler could be mounted on a mobile manipulator. For example, the manipulator could have a very heavy base that could be moved by forktruck. Or, for light rolls, the manipulator could be mounted on a pallet cart or “walkie”. Givens Lifting Systems is an innovative engineering company building a wide variety of cranes
, manipulators and material handling equipment. We are located just off the 401 in London, Ontario and only a two hour drive from Toronto, Ontario and Detroit, Michigan. Whatever your material handling requirements, we can offer a solution.