Anton Paar Gmbh

Michael Krenn

Jörg Läuger

Andreas Triebl

Frederik Wolf

Bernhard Bauer

Heinz Hohensinner

Gabriele Köpping

Denis Schütz

Di Florian Köck

Described is a measuring drive for a measuring instrument, in particular a rheometer. The measuring drive has: i) a motor, ii) a shaft, which is coupled to the motor in such a way that the shaft is drivable by the motor, and iii) an ultrasonic device, which is configured to provide ultrasound to the shaft in such a way that at least a part of the shaft is bearable substantially without contact by the ultrasound. Furthermore, the measuring instrument, a method, and a using are described.

Measuring drive having ultrasound-mounted shaft, measuring device, method and use

A rotary rheometer has two measurement parts which delimit a measurement gap and can be moved relative to one another in a predetermined movement direction by an adjustment device. At least one switching unit is provided, which responds to changes in a force flow in a force circuit of the rotary rheometer delimited by the measurement parts and has switching contacts for the activation of an adjustment device, which stops the adjustment device when a predetermined limit force value is exceeded for the force flow in the positive or negative direction, optionally without relative movement of the measurement parts, or with the measurement parts remaining in the same position.

Rotary rheometer

An extension assembly is connected or connectable, in terms of driving, to a double-motor rheometer. The double-motor rheometer includes first and second measuring motors controllable independently of each other, and provided for determining a torsional moment generated by the corresponding measuring motor. The extension assembly includes first and second sample holding parts for holding a first sample portion and a second sample portion of the sample. The first sample holding part is driveable by the first measuring motor in a rotational movement about a first axis, and the second sample holding part is driveable by the second measuring motor in a rotational movement about a second axis. The first axis is arranged so as to be parallel to and spaced apart from the second axis. The sample held in the first sample portion and in the second sample portion extends between the respective sample holding parts.

Double-motor rheometer with extension assembly

A method and a device measure tribological values of samples with a rheometer. Wherein measuring parts of the rheometer are replaced by the samples and the surfaces of the samples are moved into frictional contact relative to each other. Accordingly, it is provided that all parts of the rheometer supporting the samples in frictional connection or frictional contact and forming the rheometer power circuit, including a spring unit pressing the samples against each other, are regarded as an oscillatory circuit. Oscillation properties of the spring unit are relevant to oscillation properties of the oscillatory circuit. The oscillation properties of the spring unit are adjusted taking into consideration resonance oscillations or effects produced by changing or different measurement conditions expected with the respective measurement.

Tribometer, rheometer, module and a method for tribological measurements

A method for testing samples uses a rheometer in which a measuring shaft bearing a first measuring part is rotated by a motor and the sample is introduced into a measuring gap between the first measuring part and a further measuring part. The further measuring part is mounted on a further, driven measuring shaft and the two measuring parts are rotated or oscillated at a predetermined speed independently of one another, or brought to a standstill. At the same time or in rapidly succeeding intervals during the same measuring process, the torque and the normal force are determined by a first moment detector and the first measuring unit, and the normal force exerted by the sample on the further measuring part and/or the further measuring shaft and the torque exerted on the further measuring shaft by means of a further separate motor rotating said measuring shaft are determined by means of a further measuring unit and a further moment detector and in that said simultaneously determined measured values are supplied for evaluation.

Rheometer and rheometric method for testing samples

A method and device allow automatic trimming of samples for the measurement of the rheological properties of material samples by way of a plate/plate rheometer. In order to strip the protruding portion of the material sample arranged between the plates that projects over the circular circumferential edges of the rheometer plates&#x2014;a cutting edge, which at its setting angle with respect to the tangent is pressed against the circular circumferential edge of the plates at the line of contact and pertains to the blade of the stripping tool that is stayed, in particular articulated, by means of a holding strut at a holding point of a holding block, and the plates of the rheometer &#x2014;relative to each other&#x2014;are moved in rotation in a circle with respect to each other in at least a fully circumferential circular rotational movement, wherein the circular rotational movement is guided in such a way that the real or virtual relative rotational advance of the cutting edge of the stripping-tool blade is effected counter to the virtual or real circumferential circular rotational advance respectively of the rheometer plates.

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Zettling, Austria

Michael Krenn