JPS59169552A - Device for automatically balancing revolution body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides automatic balancing of a rotating body, in particular an annular tube mounted concentrically on the rotating body, the annular tube being filled with an amorphous compensating mass material. The present invention relates to a device for automatically balancing a centrifuge.

Devices of this type have already been used for balancing rotating bodies. This ρ device is a device used on automobile wheels to compensate for imbalances during driving. In this case, an annular tube is taken concentrically to the wheel rim and filled with particulate lead or other suitable particulate material. During driving, this lead must be distributed so that any imbalances and imbalances that occur are compensated for. However, I found that this type of device is practically useless.

While it is in principle possible to balance the wheels in the manner described above, on the other hand centrifugal) tt! : Balancing V poses a significantly larger problem. On the one hand, the cause of this can be attributed to the rotation speed, which becomes significantly high under normal conditions.
On the other hand, it is attributed to the changes in the disequilibrium that then occur. In centrifuges used for research purposes in space, ie in zero gravity conditions, imbalances can have particularly dangerous consequences. In such uses, it is necessary to compensate for imbalances. because,
Otherwise, the research needle will be damaged.

The aim of the invention is therefore to provide the rotating body with a device of the type mentioned above for automatically balancing changing imbalances. According to the invention, this problem is solved in that the rotating body is provided with a plurality of symmetrically located force detectors, the output signals of these force detectors being sent for processing via an electronic switching stage. , which is solved by driving and controlling a servo drive of the compensation space attached symmetrically to the annular tube for the volume change.

With the measures according to the invention, the unbalances that occur are compensated for in a targeted manner, with even the smallest unbalance changes being prevented. A liquid, for example water, can be used as an amorphous compensation material.

However, other liquids, such as mercury, can also be used, especially if large imbalances are not taken into consideration.

A bellows is used as a compensation space and can be adjusted to the i-axis by means of a servo drive. However, instead of bellows it is also possible to use cylinders, which cylinders communicate with the annular space and whose pistons are moved by servo drives.

In an advantageous embodiment of the invention, the rotating body is provided with force detectors, for example resistance wire strain gauges, and the annular tube is provided with three compensation spaces, these force detectors being arranged with respect to the associated compensation spaces. It is diametrically attached to the rotating body.

The invention will be explained in more detail with reference to the accompanying drawings.

The figure shows the principle of the invention as a cross-sectional view of a rotating body, namely a centrifugal separator 1. FIG.

An annular tube 2 is concentrically attached to one end surface of the centrifugal separator 1, preferably the lower surface, and the diameter of this annular tube is slightly smaller than the outer diameter of the centrifugal capacity 1. Furthermore, an annular protrusion 3 is provided on the end face holding the annular tube 2, and an annular protrusion 4 is fitted into this annular protrusion with an annular gap 5 left therebetween.

The annular protrusions 3 and 4 are arranged so that, while the inner plate-like protrusion 4 cannot isolate vibrations in the operation of the centrifuge 1, the outer annular protrusion 3 changes its position with respect to the rotation axis together with the centrifuge 1. The size is determined. However, it is also possible to replace these annular projections, that is, to configure the outer annular projection so that it cannot swing about the axis of rotation and the inner annular projection to be able to swing. In the annular gap 5 between the annular projections 3, 40, three force detectors 6 are arranged on the inner surface of the annular projection 3 at an angle of 120°, ie symmetrically.

Three diametrically opposed compensation spaces 7 are provided in the annular tube 2 and are arranged symmetrically with an angular interval of 120° from each other. The connecting tube pieces 8', 8'' of these bellows are connected, for example, in a gland-paragin manner, to the attached connection of the annular tube 2. The piece 8 is connected to servo motors 9', 9'' of a servo drive 10, and these servo motors are driven and controlled by the output signal of the attached force detector 6.The servo drive 10 includes:
An electronic switching stage is provided for processing the output signal generated by the force detector 6 in the event of imbalance.

During centrifugation (4% 1 operation, for example, the unbalance indicated by arrow 11 generates an output signal on force detector 6, then 3
Due to the fact that two force detectors are provided, output signals of different magnitude and polarity are generated, which are processed in the electronic switching stage of the servo drive 10 through appropriate sinusoidal calculations and 7 is supplied to an attached servo motor 9 for volume change. In this case, the imbalance 11 is compensated by a volume change in the opposite bellows and a volume reduction in both other bellows. thus,
Any imbalance occurring at any angular position can be automatically compensated.

Apart from compensating for the resulting imbalance, the mass change takes place over a constant radius via the volume change. Additional moments of inertia are thereby prevented.

[Brief explanation of drawings]

The drawing illustrates the principle of the present invention as a cross-sectional view of a rotating body, that is, a centrifugal separator. DESCRIPTION OF SYMBOLS 1... Centrifugal separator, 2... Annular tube, 3, 4... Annular protrusion, 6... Force detector, 7... Compensation space, 10...
... Servo drive device patent applicant Elk Raumfahrttechnik Gesellschaft Mituto Beschlenkter Huffnong

Claims (1)

[Claims] 1. Balancing a rotating body, in particular a centrifuge having an annular tube attached concentrically to the rotating body, the annular tube being filled with a compensating mass material of irregular shape. In the device, a rotating body (1) is provided with a plurality of symmetrically located force detectors (6), the output signals of these force detectors being sent for processing via an electronic≠switching stage. is attached to the servo drive (1) of the compensation space (7) symmetrically arranged in the annular tube (2) for volume changes.
0) A device for automatically balancing a rotating body. 2. Device according to claim 1, characterized in that a liquid, in particular water, is used as the amorphous compensating mass material. 3. Device according to claim 1 or 2, characterized in that the compensation wall is constructed as a bellows (7) that can be deformed by means of a servo drive (10). 4. Claim characterized in that the compensation space is constructed as cylinders connected to annular tubes (2), the pistons of these cylinders being connected to a servo drive (10) for volume change. The device according to item 1 or 2. 5. The rotating body (1) is provided with three force detectors (6), in particular resistance wire strain gauges, the annular tube (2) is provided with three compensation spaces (7), and the force detector (6) 5. Device according to claim 1, characterized in that the rotary body (1) is attached diametrically to the associated compensation space (7).