Herrmann Ultraschalltechnik Gmbh & Co. Kg

Afag Holding Ag

Lisa Draexlmaier Gmbh

Robert Boschgmbh

Lisa Draxlmaier Gmbh

Jens Twiefel

Ulrich Vogler

Walter Haussecker

Gabriel Ertz

Klaus Bott

Sebastian Mojrzisch

Izudin Mesan

Jorg Wallaschek

Jörg Wallascheck

Lutz Lehmann

Jörg Wallaschek

Felix Klimas

Thomas Herzing

Daniel Zemann

Michael Weinstein

Peter Froehlich

Joerg Wallaschek

Vincent Rieger

Volker Rischmueller

Dirk Guenther

Tobias Hemsel

Jorg Wallascheck

The present invention relates to a method for determining at least one physical characteristic value of an electromechanical oscillatory system, which comprises a piezoelectric element and at least one additional element coupled, with respect to oscillation, to the piezoelectric element, the piezoelectric element having an electrode and a counter electrode. The method comprises the following steps: (a) applying an electrical alternating voltage between the electrode and the counter electrode for the duration of an excitation interval in order to induce mechanical oscillation of the oscillatory system or of a sub-system of the oscillatory system, so that after the excitation interval has expired, the oscillatory system or the sub-system performs a free oscillation without excitation, (b) after the end of the excitation and during the free oscillation of the oscillatory system or of the sub-system without excitation: (i) measuring a time curve of a voltage U between the electrode and the counter electrode, or (ii) short-circuiting the electrode and the counter electrode with a line and measuring a time curve of a current I through the line, and (c) determining the at least one physical characteristic value of the electromechanical oscillatory system from the time curve of the voltage U, which time curve was measured in step b) i), or the time curve of the current I, which time curve was measured in step b) ii).

Method and generator for characterizing an oscillatory system

An ultrasonic vibration device has a sonotrode and a converter, the converter having a piezoelectric actuator for converting an electrical alternating voltage into a mechanical vibration. A first piezoelectric sensor element outputs a first measurement signal which varies in dependence on the vibration amplitude of the mechanical vibration. To permit measurement of at least one intensive state variable like the temperature, or the aging state of the piezoelectric actuator, a second piezoelectric sensor element outputs a second measurement signal which also varies in dependence on the vibration amplitude of the mechanical vibration. However, the second piezoelectric sensor element differs in a physical property from the first.

Ultrasonic vibration device having a first and a second piezo sensor

A device to determine a state of an ultrasound welding process, which can be carried out using an ultrasound tool, includes a sensor element and an evaluation unit. The sensor element is configured to detect an electrical control signal from an ultrasound tool. The evaluation unit is configured to determine a signal property of the control signal and to determine the status of the ultrasound welding process based on a reference signal profile and on the determined signal property. An assembly with an ultrasound welding system and a method are also included.

Device for determining a status of an ultrasonic welding process

The present invention concerns an ultrasonic vibration unit having a converter () for converting an electric ac voltage into a mechanical ultrasonic vibration and a sonotrode which is vibrationally coupled to the converter (), wherein the sonotrode and the converter () are matched to each other in such a way that the ultrasonic vibration unit can vibrate with a natural frequency f, in which a standing longitudinal wave having at least one vibration node and at least two vibration antinodes is formed within the ultrasonic vibration unit. To provide an ultrasonic vibration unit in which the parasitic vibrations which usually occur in operation with a working frequency are slight or do not occur, wherein at the same time the actual working frequency is not attenuated, it is proposed according to the invention that there is provided a damp vibration absorber unit () connected to the ultrasonic vibration unit by way of a coupling element (), wherein the coupling element () is connected to the ultrasonic vibration unit at a vibration node, wherein the vibration absorber unit () is connected to a damping element () which is so adapted that it damps a vibration of the vibration absorber unit ().

Ultrasonic vibration unit with damping

An oscillating conveyor comprising an oscillating rail, at least one electromagnet with a coil, and an armature connected to the oscillating rail, which armature can be moved by activation of the coil to generate an oscillation of the oscillating rail, wherein the coil is part of an oscillator circuit, wherein the oscillator frequency of the oscillator signal of the oscillator circuit depends on the inductance of the coil, which is influenced by the position of the armature relative to the coil, wherein the oscillating conveyor comprises a feedback circuit, which drives the coil by means of a control signal which maps the change over time in the frequency of the oscillator.

Oscillating conveyor and method for operation of an oscillating conveyor

A sensor device which is used to provide a control device with at least one operating parameter of an oscillating conveyor, the control device being used to control a drive device for exciting oscillation of an oscillating rail on the basis of the operating parameter, the sensor device including at least one sensor element for recording the operating parameter or at least one measured value from which the operating parameter can be determined, the sensor device including at least one communication device for wirelessly transmitting the operating parameter to the control device and an energy supply device for supplying the sensor device with operating energy, the energy supply device being used to convert a vibration generated by the drive device and/or electromagnetic radiation into the operating energy.

Sensor device for providing at least one operating parameter of an oscillating conveyor, and oscillating conveyor

An oscillating conveyor including an oscillating rail, on which goods can be conveyed in the direction of a first position on the oscillating rail by oscillation of the oscillating rail, and also including at least one excitation element for exciting the oscillation. The excitation element is an ultrasonic transducer which is coupled to the oscillating rail at the first position and via which the oscillating rail can be excited into oscillating at the first position in dependence on a control signal supplied by a control device. The oscillating conveyor has at least one damping element and/or the oscillating rail itself is formed from an oscillation-damping material so that the oscillation amplitude decreases along the oscillating rail as the distance from the first position increases.

Oscillating conveyor

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Hannover, Germany

Jens Twiefel