Ultrasonic vibration unit
The invention relates to an ultrasonic vibration unit ( 10 ) for an ultrasonic welding device for sealing and welding material webs, comprising a sonotrode ( 12 ) connected to a converter ( 14 ) and having at least one sealing horn ( 16 ) radially protruding from an axis of rotation (a) and rotatable about the axis of rotation (a) and having a free end forming a sealing surface ( 18 ). The sonotrode ( 12 ) comprises a sonotrode shaft ( 20 ) having the axis of rotation (a). One or both end faces ( 22 ) of the sonotrode shaft ( 20 ) are connected to a converter ( 14 ) and the sealing horns ( 16 ) are attached to the sonotrode shaft ( 20 ) directly or by means of boosters ( 24, 26 ) when vibrational nodes (K L ) of a longitudinal vibration (S WI ) of the sonotrode shaft ( 20 ) are present.
1. An ultrasonic vibration unit for an ultrasonic welding device for sealing and welding material webs, comprising a sonotrode ( 12 ) connected to a converter ( 14 ) and having at least one sealing horn ( 16 ) radially protruding from an axis of rotation (a) and rotatable about the axis of rotation (a) and having a free end forming a sealing surface ( 18 ), wherein the sonotrode ( 12 ) comprises a sonotrode shaft ( 20 ) having the axis of rotation (a), wherein at least one end face ( 22 ) of the sonotrode shaft ( 20 ) is connected to the converter ( 14 ) and the at least one sealing horn is attached to the sonotrode shaft ( 20 ) by means of boosters ( 24 , 26 ) when vibrational nodes (K L ) of a longitudinal vibration (S Wl ) in the sonotrode shaft ( 20 ) are present, wherein each booster ( 24 , 26 ) and the at least one sealing horn ( 16 ) extend radially from the axis of rotation (a).
2. The ultrasonic vibration unit according to claim 1 , characterized in that each sealing horn ( 16 ) has a single attachment point.
3. The ultrasonic vibration unit according to claim 2 , characterized in that a plurality of sealing horns ( 16 ) is disposed so as to radially protrude from the axis of rotation (a) when one and the same vibrational node (K L ) is present.
4. The ultrasonic vibration unit according to claim 2 , characterized in that a plurality of sealing horns ( 16 ) is disposed so as to radially protrude from the axis of rotation (a) when different vibrational nodes (K L ) are present.
5. The ultrasonic vibration unit according to claim 1 , characterized in that each sealing horn ( 16 ) has at least two attachment points, wherein the attachment points are in each case spaced apart from one another at a distance which is multiple times greater than a wave length of the longitudinal vibration (S Wl ).
6. The ultrasonic vibration unit according to claim 5 , characterized in that a plurality of sealing horns ( 16 ) is disposed so as to radially protrude from the axis of rotation (a) when the same vibrational nodes (K L ) are present.
7. The ultrasonic vibration unit according to claim 5 , characterized in that a plurality of sealing horns ( 16 ) is disposed so as to radially protrude from the axis of rotation (a) when different vibrational nodes (K L ) are present.
8. An ultrasonic vibration unit for an ultrasonic welding device for sealing and welding material webs, comprising a sonotrode ( 12 ) connected to a converter ( 14 ) and having at least one sealing horn ( 16 ) radially protruding from an axis of rotation (a) and rotatable about the axis of rotation (a) and having a free end forming a sealing surface ( 18 ), wherein the sonotrode ( 12 ) comprises a sonotrode shaft ( 20 ) having the axis of rotation (a), wherein at least one end face ( 22 ) of the sonotrode shaft ( 20 ) is connected to the converter ( 14 ) and the at least one sealing horn is attached to the sonotrode shaft ( 20 ) by means of boosters ( 24 , 26 ) when vibrational nodes (K L ) of a longitudinal vibration (S Wl ) in the sonotrode shaft ( 20 ) are present, and wherein each booster ( 24 , 26 ) is positioned between the at least one sealing horn ( 16 ) and the sonotrode shaft ( 20 ).
9. An ultrasonic vibration unit for an ultrasonic welding device for sealing and welding material webs, comprising a sonotrode ( 12 ) connected to a converter ( 14 ) and a plurality of sealing horns ( 16 ) radially protruding from an axis of rotation (a) and rotatable about the axis of rotation (a) and having a free end forming a sealing surface ( 18 ), wherein the sonotrode ( 12 ) comprises a sonotrode shaft ( 20 ) having the axis of rotation (a), wherein at least one end face ( 22 ) of the sonotrode shaft ( 20 ) is connected to the converter ( 14 ) and each of the plurality of sealing horns is attached to the sonotrode shaft ( 20 ) by means of separate boosters ( 24 , 26 ) when vibrational nodes (K L ) of a longitudinal vibration (S Wl ) in the sonotrode shaft ( 20 ) are present, and wherein each booster ( 24 , 26 ) directly attaches the respective sealing horn ( 16 ) to the sonotrode shaft ( 20 ).