DE7341264U - Device for compensating the imbalance of a rotating body, in particular a grinding wheel - Google Patents

Description

Patent attorney Dipl.-Phys. Gerhard Liedl 8 Munich 22 Steinsdorfstr. 21-22 Tel. 29 84

C 6336

Gebr. HOFMANN KG,! Maschinenfabrik Darmstadt, Pallaswiesenstrasse Tl

Device for compensating the imbalance of a rotating body, in particular a grinding wheel

The invention relates to a device for compensating for the imbalance a rotating body, in particular a grinding wheel with a plurality of chambers arranged around the axis of rotation and rotating with the rotating body, in which, depending on one occurring Unbalance controlled by a control device, a balancing fluid Is collectable.

N / M

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Such a device is known (German patent specification 877 887).

For machines with rotating parts it is necessary to carry out a balancing. Especially in machines, such as grinding machines, which have parts that are subject to extreme wear and tear, a quick and economical balancing is necessary because of this uneven wear imbalances can occur. Because grinding wheels at high speeds, there are large imbalance forces due to minor deviations.

In known devices, the adjustment of the compensation device for the unbalance compensation is carried out by complicated and expensive mechanical devices using counterweights, wherein especially the fine adjustment of the counterweights big problems poses. In addition, ·. the known devices very large, there the adjustment devices take up a lot of space and are bad are accessible.

Particularly in the case of angled straight machine, surface grinding machine η or grinding rollers mounted on both sides, the Attaching the unbalance compensation device great difficulties.

A balancing device is off for washing and legging machines the aforementioned German patent 877 887 became known, in which the washing drum has three additional chambers and on whose end face conveyor rings are arranged eccentrically to the axis of rotation at angular intervals, into which water from supply pipes yes after Valve actuation flows in.

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The disadvantage of this device lies in the expensive construction of the eccentric conveyor rings that worked very precisely and subsequently must be attached to the drum. In addition, there is this device no center freedom, but the z. B. for attaching the device between the grinding machine and grinding wheel is absolutely necessary.

The invention is now based on the object of proposing a compensating device of the type mentioned at the outset, which is quick Allows unbalance compensation on rotating bodies with simple construction means.

This object is achieved according to the invention in that the chambers Are housed in a ring-shaped container, on the end face of which liquid gelatin channels are provided, which are on different radii are arranged, each inlet or all inlets being assigned to a specific radius of a specific chamber and that a liquid feed line is provided for each radius.

The ring-shaped container can preferably be divided into four chambers be. In simple catfish, the liquid gels are designed as slots that lie on different radii and the liquid glands for the different radii are designed as nozzles. The nozzles are arranged one behind the other or one above the other. BeL of a grinding machine, the ring-shaped container can be attached directly to the grinding «· be arranged disc base body. As balancing fluid that is used in the respective chamber is injected, a cooling liquid is suitable if such a liquid is used during the operation of the respective Machine is provided. The balancing fluid is used during the Rotation of this revolving body of revolution through the corresponding

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Liquid inlets injected into the respective chambers. To be good To achieve guidance of the nozzles on the end face of the annular container, the slots that form the liquid inlets can In grooves that are ring-shaped and which have the corresponding Coincide radii, be provided.

The liquid is supplied via a distribution block with the appropriate number supplied by valves to the individual nozzles. The valves are controlled as a function of occurring imbalances, so that the imbalance liquid is injected into the respective chamber.

The invention also has the advantage that when carrying out an unbalance compensation, you only get information about the size of the unbalance required, which can be supplied by known unbalance measuring devices. A calibration of this size or a phase reference signal is not necessary.

The invention will now be described with reference to an exemplary embodiment in the legends Figures explained in more detail. Show it

Flg. 1 schematically the device in side view;

Figure 2 is a view of the ring container.

A machine with a rotating body, in our example a grinding machine 1 with a grinding wheel attached to a spindle 2 3, has a protective cover 4. A ring-shaped container 1st attached concentrically to the axis of the rotor with screws 6 on a base body 7 of the grinding wheel 3. The ring-shaped container 5 has four chambers 8-11 uof and canoe from Bleed, ζ us amme n-

6336

be welded or worked out of one piece and is provided with a cover 12 which forms a free end face. Of the Lid 12 of the annular container 5, which is fastened with screws can be, has four slits 13-16 as a liquid gel outlet, each chamber 8-11 is assigned a slot 13-16. the Slots 13-16 are made on different radii, with in particular the interior area is chosen to have a large capacity the compensation facility. A concentric ring-shaped recess 17-20 is assigned to each slot in order to improve it To get fluid guidance and a better swirling behavior. Furthermore, this allows the nozzles 21-24 to be as close as possible the slots 13-16 are brought. The nozzles 21-24 are firmly on attached to the protective cover 4 of the grinding machine 1 and arranged one above the other. Each nozzle is a slot and thus a chamber assigned. The balancing fluid flows from a storage container 25 via a duct 26 to a valve block 27, the valves 28-31 having. The valves 28-31 are connected to the nozzles 21-24 via lines tied together.

The ring-shaped container 5 also has one ring-shaped one Opening 32, the function of which is described below.

For each compensation process, a maximum of the following program steps must be carried out, with the process at one facility is explained with four chambers.

In the event of an displayed imbalance in the measuring electronics, for example the valve 28 is actuated so that the balancing liquid from the container 25 via the nozzle 24 through the slot 16 into the chamber 11 during the rotation arrives. As with grinding machines or lathes

Cooling liquids can also be used as a selection medium Cooling liquid can be selected so that the liquid splashing past the soles does not pose any further problems. Will now the If the unbalance display of the measuring electronics is larger, the valve 28 is blocked and the valve 30 is opened. This creates a sense of unfairness in the opposite chamber 9 injected. This continues until the Display reached a minimum. The valve 29 is then actuated and unbalanced liquid is injected into the chamber 10. He follows; If there is also an increase in the display, the valve 29 is blocked and the valve is actuated again, i.e. unbalance liquid is injected into the opposite chamber 8 until the unbalance display shows a minimum is achieved. Zorn conclusion is followed by alternating pressing of the Valves 30 and 31 until the electronic unbalance display shows zero or is in the tolerance field »

The compensation process can of course also be carried out after the component display or fully automatically.

After switching off the machine and during the Auslaufvorgasg the water flows through the annular opening 32 out of the hanging container 5 and thus enables rebalancing when the machine is restarted.

Claims (7)

1.Device to compensate for the unbalance of a rotating body, in particular a grinding wheel, with several around the axis of rotation arranged, with the rotating body revolving chambers, In controlled by a control device as a function of an imbalance that occurs, an imbalance liquid can be introduced as a result characterized in that the chambers (8-11) are accommodated in an annular container (5), on the end of which fluttsstgkeltelSte (IS- 16) are provided, which are arranged on different radii, each inlet or all inlets being assigned to a specific chamber on a specific radius, and that for each Radius a FlussIgkeltszuleltung (21-24) is provided. 2. Apparatus according to claim 1, characterized in that the Liquid gel capsules (IS-16) are designed as slots and the Fllieslgkettzuleitungen (21-24) as nozzles so that the balancing flask can be sprayed directly into the chambers (8-11). S. Apparatus according to claim 1, characterized in that the ring-shaped »container (5) directly on the rotating body, in particular Is arranged on the key plate base body (7). 4. Apparatus according to claim 1 or 2, characterized in that that on the end face of the annular container (5) additional annular grooves (17-20) are provided, the radii of which correspond to the radii on which the Flttesigkette class (13-16) is provided are. 5. Vorrlchtuag according to one of the Anaprüohe 1 to 4, characterized in that in the annular container (5) four chambers (8-11) are provided. 6. Device naoh one of address 1 to 5, characterized in that the AusuohtfUtasigkelt is a cooling liquid. 7. Vorriobtung naoh one of claims 1 to 6, characterized in that the inlets (13-16) lie on radii in the vicinity of the inner diameter of the annular container (5).