Device for positioning a measuring probe

Details Device for positioning a measuring probe Device for positioning a measuring probe

1999-09-20

2001-02-06

Raevis, Robert (Department: 2855)

Measuring and testing

Probe or probe mounting

Reexamination Certificate

active

06182521

ABSTRACT:

FIELD OF THE INVENTION
The invention concerns a device for positioning a measurement probe relative to a probe axis.
BACKGROUND
Positioning devices serve for the most varied positioning tasks, in which probes, sensors, grippers, tools, and the like must be introduced at a specific place determined in advance and in a defined position. In flow measurement segments, for example, the most varied flow measurement probes, such as pressure, temperature, anemometer, directional and special measurement probes must be positioned at measurement sites precisely indicated in advance. The positioning, which must be conducted very exactly depending on the measurement task, is frequently made difficult by special environmental conditions, such as, for example, high temperatures. In the case of probes with probe heads turned away from the probe axis, a movement along the probe axis and rotationally around the probe axis is at least necessary, in order to align the probe head as desired on the object to be measured. Thus, frequently, displacement paths of several dozen cm and rotations of +/−180 angular degrees are necessary. Such positioning devices are controlled for the most part with the help of a computer programmed according to the positioning task. In order to be able to conduct measurements or positionings in spatially limited installation conditions, devices with compact dimensions are desired.
SUMMARY OF THE INVENTION
Proceeding from this, it is an object of the invention to provide a device of this type for the positioning of a measurement probe, which makes possible a very precise positioning of the measurement probe along a probe axis A and in rotation relative to this axis, whereby the device should occupy as little installation space as possible.
The invention has the advantage that due to a coaxial arrangement of the adjusting units for rotation and for longitudinal displacement of the probe as well as a step-down gear lying therebetween, on the one hand, a very compact construction of the device is made possible, and on the other hand, a coaxially arranged passage can be left free, through which the probe shaft can be inserted and moved. The adjustment units and their motors thus surround the probe shaft concentrically, which in turn brings about a useful reversal of the rotary motion of the motors by means of the gear. The rotational motion of the motors can be reversed with small mechanical expenditure into a rotating or longitudinal motion of the measurement probe with very small play. Due to the fact that the linear adjustment unit is flange-mounted at the gear output, and the rotational movement of the probe is designed accordingly, the linear movement of the probe can be designed independently of the rotational movement. Again, a simplified construction results relative to positioning units introduced outside the probe axis, which in turn leads to an increased precision due to the small play. On the other hand, a module-type construction of the adjustment units and the gear makes possible a simple exchange of modules, if, for example, different transmission ratios are desired, or to replace defective parts.
Further advantageous forms of embodiment of the invention will result from claims
2
to
15
.


REFERENCES:
patent: 3025464 (1962-03-01), Bond
patent: 3595087 (1971-07-01), Starks
patent: 3862578 (1975-01-01), Schluter
patent: 4663727 (1987-05-01), Saporito et al.
patent: 4710710 (1987-12-01), Flora et al.

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