Swac Electronic Gmbh

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

S.w.a.c. Schmitt-walter Automation Consult Gmbh

Stefan Schmitt-Walter

Lutz Seffner

Robert Hartmann

Sylvia Gebhardt

Thomas Roedig

Bent Brueckner

Andreas Schoenecker

A pressure sensor has a multiplicity of piezoelectric converter elements which are arranged such that they are essentially parallel to a force-applying or pressure-applying direction. The converter elements can be arranged at a distance from one another by an insulating material and/or are at least partially embedded in the material. A support material having greater mechanical rigidity than the converter elements, in particular in the force-applying or pressure-applying direction, is assigned to at least a number of piezoelectric converter elements, or the piezoelectric converter element is applied, in the form of a layer, to a supporting body made from this support material and is electrically contact-connected, for example, by a bottom electrode, which is arranged between the converter element layer and the supporting body, and a cover electrode which is applied to an outer side of the converter element layer.

Pressure sensor

A drive device for a pair of welding tongs having a pair of limbs, is arranged between the adjusting ends of the limbs, located opposite to the welding electrodes, for adjusting between a welding position and a standby position. In order to reduce its length, provide continuous control and monitoring, simplify the device and reduce noise, the drive device is provided with an electric motor-driven screw-thread drive with a rotating nut and a rotating spindle which is axially displaceable between an extended and a return position, the spindle being connected to an adjusting end of the limb. The drive device can be used as a main drive for a pair of welding tongs for the positioning of the limbs, or can be used as a secondary drive, for setting of a stopping position of the pair of welding tongs.

Drive device for welding tongs

A method for open or closed-loop control of welding tong movement utilizes a welding tong drive having a primary and a secondary drive device. The primary drive device moves two welding tong limbs with welding electrodes toward a welding object from opposite sides. The welding tong limbs press onto the welding object with a predetermined compressive force. During actuation, the secondary drive device varies a spatial orientation of the welding tongs. In order to contact the welding object in a controlled manner, and to reliably acquire any deviations from specified spatial points during contacting, the welding tongs first approach a spatial point relative to the welding object. The welding tong limbs are held in a fixed spatial orientation during the approach. The secondary drive device is actuated until a welding tong limb contacts the welding object. The primary drive device then closes the welding tong limbs.

Method of open and/or closed-loop control of the movement of welding tongs

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Oberhaching, Germany

Stefan Schmitt-Walter