Used for winding and unwinding coils on shaftless systems.
Expanding chucks for winding and unwinding reels
Developed for shaftless systems, our expanding chucks guarantee the correct winding and unwinding of reels of any material.
If the machine’s frames are fixed, expanding shafts are used to make the reel spin; if instead the machine’s frames are moving, expanding chucks are used in order to allow them to enter and exit the reel.
Expanding chucks can be realized in different materials:
Svecom’s study of the used materials and thorough planning ensure the best performances and a longer service life to all of our products.
Expanding elements’ characteristics
Expanding elements can be of different dimensions and weights, according to the type of machine, and can have a diameter that goes from 50 mm to 1000 mm.
They can be of four different types:
Lugs and ledges can be made of metal or hard rubber, whilst leaves are generally made of steel, and are externally coated with rubber in case the cores are made of steel too.
The mechanism that allows elements to lift and block the core of the reel to allow its rotation can be activated different ways:
Pneumatic: inside the chuck there is an inner tube or a rubber tire which is inflated up to 6 bar pressure for letting the elements expand.
Mechanical: the rotation activates the inclined plans that make the elements lift, and it is triggered by a key. Some mechanical chucks models can be self-expanding, therefore the elements automatically self-expand as an effect of the rotation.
Pneumechanical: the chuck is equipped with a pneumatic piston connected to inclined plans, which by self-expanding activates them and triggers the movement.
There are two types of expanding chucks which distinguish themselves from the others for their peculiarities and fields of application:
-Model with leaves
The reel-lifting chuck, positioned vertically, is assembled on handling systems, and is used for the safe transportation and handling of reels.
This particular type has a mechanical expansion and a pneumatic retraction.
The chuck with leaves is mainly used in paper mills for the transformation of tissue paper, it is self-centering and has a wide range of expansion (up to 20 mm).
The leaf is an internal mechanism of the chuck, a little rod which moves from an inclined to an upright position and can safely lift the chuck. This type of mechanism brings the advantage of lengthening the life of the cores, since it does not consume their internal part.
Thanks to this peculiarity, the operators’ work is reduced to zero, when instead they would have to repair the cores manually; better safety for workers is achieved and consequently there is a production increasement.
Cores can be made of the following materials:
In some cases, they get treated so that they do not oxidize.
For example, if they are made of aluminum, they can be treated with anodizing (anodic oxidation), a process which makes the aluminum shinier and increases its hardness.
If they are made of steel, they undergo processes of zincing, bluing and nickel plating; this last one is an electrolytic treatment which gives and amazing aesthetic output and gives the cores an almost silvered aspect.
Fields of application
All our products are customizable according to the field of application and to the client’s needs and are realized considering the weight and dimensions of the reels to be winded and unwinded.
They can be used in the following fields:
-Plastic film transformation
-Aluminum sheet processing
According to the type of machine on which they are assembled, details and customizations upon request can be added.
The different types of chucks that our production is capable of realizing guarantee heavy charges, perfect grip, and safety, therefore they allow us to satisfy any type of industrial need and the multiple demands of the world market.