| 摘要 |
Fluid forces acting on the impeller of mixing apparatus which produce bending movement (deflection) of the impeller shaft which may adversely effect the operation of the mixing apparatus are measured by detecting the movement of a non-rotating component of the mixing apparatus, namely the gear box which, together with a drive motor, constitutes the drive mechanism of the mixing apparatus. The gear box is flexurally supported on beams spanning the tank into which the shaft and impeller extend. A gage in proximity to the gear box, and preferably perpendicular to the axis of the beam, provides output signals in response to the displacement (distance) of an exterior wall of the gear box therefrom. These output signals are processed and used to control the motor, as by reducing the speed of the motor in response to fluid forces exceeding a certain level thereby reducing such forces or stopping the motor thereby preventing any damage to the shaft. The movement of the gear box and the corresponding output signals from the gage have been found to correlate directly with the deflection of the shaft in response to fluid forces, even though the gear box does not rotate with the shaft, and this correlation occurs over the entire dynamic range of the fluid forces.
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