EP2794115B1 - Centrifuge assembly - Google Patents

Description

The invention relates to a centrifuge arrangement according to the preamble of claim 1.

A generic centrifuge arrangement as a separator arrangement is from the US 4 007 612 A. known. The state of the art also DE 10 2006 011 895 A1 and the WO 2009 / 071052A1 named.

According to a known embodiment, the centrifuge feet for the vibration-damped installation of the machine frame, in which the drive spindle is rotatably mounted, each have a circular bearing which is covered by a cover pot. The circular bearing dampens the vibrations of the machine in the horizontal and vertical directions. The damping properties and the spring properties of the rubber material of the circular bearing are characteristic of this. The mass of the separator arrangements and the spring properties of the circular bearings (horizontal and vertical) result in a resonance frequency of the system and the damping properties of the elastic material (elastomer / rubber material) influence the amplitude in the resonance frequency range.

It is the object of the invention to create a centrifuge arrangement with an improved support foot construction.

The invention solves this problem by the subject matter of claim 1.

The at least one adjustable first elastic element is designed to adjust the horizontal spring stiffness and damping of the mass / spring system.

According to the invention, it is possible to change the spring stiffness in the horizontal direction. So the centrifuge foot can depend on the design and the particular Use can be optimally matched and adjusted to the given resonance properties of the system or the resonance properties of the entire system can be influenced in a simple manner by the adjustment option on the centrifuge foot.

The separation into a first - adjustable - elastic element for changing the spring properties and the damping properties of the second existing elastic element and into a second - not adjustable - elastic element - with fixed spring and damping properties is particularly advantageous.

The centrifuge foot preferably has a foot support for introducing the forces of the supported centrifuge - in particular the separator - into the centrifuge foot.

According to a preferred - but not mandatory - variant of the invention, it is particularly advantageous in terms of design that the adjustable first elastic element is arranged above a foot support and the at least one second elastic element - preferably a round bearing or a round bearing arrangement - is arranged below the foot support, with the rigidity of the arrangement can be adjusted for the upper first elastic element with regard to the natural resonance frequencies of the rotating system, and the lower second elastic element is used for spring-loaded installation.

The adjustment of the pressing force in the horizontal direction also acts to adjust the suspension in the vertical direction. In particular, there is the advantage that a relatively high rigidity can be set in the horizontal direction in order to shift the resonance frequencies upwards.

Further advantageous configurations are specified in the remaining subclaims.

• Fig. 1 eine schematische Darstellung einer Separatoranordnung;
• Fig. 2 einen Schnitt durch einen ersten Stützfuß für eine Separatoranordnung nach Art der Fig. 1;
• Fig. 3 einen Schnitt durch einen zweiten Stützfuß für eine Separatoranordnung nach Art der Fig. 1;
• Fig. 4 einen Schnitt durch einen dritten Stützfuß für eine Separatoranordnung nach Art der Fig. 1;
• Fig. 5 einen zu Fig. 2 in Höhe der Linie A-A senkrechten Schnitt durch den Stützfuß der Separatoranordnung aus Fig. 4; und
• Fig. 6 einen Schnitt durch einen dritten Stützfuß für eine Separatoranordnung nach Art der Fig. 1.

The invention is described in more detail below with reference to the drawing using an exemplary embodiment. It shows:

• Fig. 1 a schematic representation of a separator arrangement;
• Fig. 2 a section through a first support foot for a separator arrangement of the type Fig. 1 ;
• Fig. 3 a section through a second support foot for a separator arrangement of the type Fig. 1 ;
• Fig. 4 a section through a third support leg for a separator arrangement of the type Fig. 1 ;
• Fig. 5 one too Fig. 2 at the level of the line AA vertical section through the support foot of the separator arrangement Fig. 4 ; and
• Fig. 6 a section through a third support leg for a separator arrangement of the type Fig. 1 .

Fig. 1 shows a centrifuge arrangement, here a separator arrangement, which has a centrifuge 1 with a centrifuge drum (not recognizable here, since covered) and a hood 2 covering the drum.

The drum also has a drive (for example an electric motor; cannot be seen here), see, for example, the DE 10 2006 011 895 A1 . In particular, the drive is arranged in an axial extension of the rotatable drive spindle directly below the drum.

To Fig. 1 the drive is arranged within a machine frame 3 on which the drive spindle is rotatably mounted with at least one or more bearings (see again the generic one DE 10 2006 011 895 A1 ).

The entire separator - that is to say the machine frame 3 with the hood 2 and the drum and the drive - is set up or supported on at least one or more support feet 4 having elastic or damping properties on a base such as a foundation 5.

According to a first variant, the support feet 4 have the preferred and advantageous - but not mandatory with regard to each element shown - the structure of the Fig. 2 on.

To fasten the support leg 4 to the machine frame 3, at least one (correspondingly stably designed) screw bolt 6 is used for each support leg, which is inserted vertically from below into a corresponding threaded hole 3 'of the machine frame 3 (see here for an example Fig. 4 ) (screwed).

In the following, the term "axial" refers to the vertical and the term "radial" to the horizontal direction.

The bolt 6 passes through 2 to 4 in each case vertically from below, a central bore 7a of a stepped foot support, which is designed here as a preferably circumferentially closed ring 7.

The ring 7 has a vertically first lower section 8 and an upper second section 9 with a smaller diameter than the first section 8. In this way, an annular support surface 10 is formed on the ring 7 in the area in which the lower section 8 has a larger radius than the upper section 9. At least one first - adjustable - elastic element 11 is arranged on the support surface 10 - placed here. Several of the first adjustable elements 11 can also be provided. Here the ring could be divided into segments.

The first elastic element 11, here in an advantageous and simple embodiment an elastic ring, is in turn completely or at least partially covered by a pressure medium 12, preferably an annular cover plate, from above.

The pressure medium 12, the first elastic element 11 and the ring 7 demonstrate Fig. 2 and 3rd in a simple manner aligned vertical bores 13, 14, 15. The bores 15 in the stepped ring 7 are preferably provided with a thread 16. Screw bolts 17 are inserted vertically from above into the respective circumferentially distributed bores 13, 14, 15.

The stepped ring 7 is supported vertically downwards on a circular bearing arrangement 18 with circumferentially distributed circular bearings 19 arranged on a circle, each have an elastomer 20 between an upper and a lower plate 21, 22. The circular bearing arrangement 18 is in turn placed on a lower base plate 23.

On the base plate 23, an outer ring 24 is also arranged / formed as an abutment for the elastic element 11, the height of which corresponds here to the total height from the circular bearing arrangement, the section of the ring 8 and the elastic element 11 and the pressure medium 12 and a gap S4. The ring 24 is arranged concentrically on the outside of the ring 7, but has a circumferential gap S2, S3 or does not abut against it.

The outer ring 24 surrounds the circular bearing arrangement 18, as well as the foot support and the elastic element 11 to the outside. The metal base plate 23 can be penetrated by bolts 26 which fix the circular bearings 19 and the inner ring 7 and, if appropriate, the outer ring 24 on the base plate 23. Not all of these bolts are shown here. The outer ring 24 can also be designed Fig. 2 be molded onto the base plate (not shown here).

The base plate 23 can in turn be screwed directly or via further intermediate elements to a base such as a foundation (not shown here).

The one or more circular bearings 19 of the circular layer arrangement 18 provide spring-loaded support. They form an embodiment variant of the non-adjustable, second elastic element of claim 1.

An air gap S1, S2, S3 is preferably formed in each case between the outer ring 24 and the inner ring 7 and between the outer ring and the round bearing (s), so that a sufficient relative movement between these elements is possible during operation.

A on the ring 24 (eg with screws), radially protruding from the ring 24 towards the inside - screwed here in the area of line 25 '- cover element 25 prevents the foot support 7 and the Pressure medium 12 and the elastic element 11 vertically upwards. The cover element overlaps the pressure medium 12 here.

The inner ring 7 - as the foot support - can move vertically to a limited extent depending on the setting of the at least one elastic element 11 (gap S4 to the cover element, here a cover ring 25).

The support leg described can be covered again by a cover pot, not shown here, in particular as dust protection.

The at least one elastic element 11 is dimensioned and arranged (as a variant of the adjustable, first elastic element of claim 1) in such a way that it is directly horizontally - here relative to the screw bolt 6 radially inwards and radially outwards - directly on the inner and the outer ring 7, 24 can be pressed, the contact pressure being adjustable.

This setting of the contact pressure can be done in different ways.

So the elastic element 11 according to the variants of Fig. 2 and 3rd by a more or less strong tightening of the bolts 17, which pass through the pressure medium 12 and the elastic element 11, more or less compressed, as a result of which it expands more or less radially inwards and outwards.

As a result, the pressing force or pressing force between the elastic element 11 and the inner or the outer abutment - foot support 7, outer ring 24 - and thus the spring force is changed. The inner abutment here is the foot support, in particular the ring 7, and the outer abutment is the outer ring 24, which can be coupled unsprung to the foundation directly or via intermediate elements (plate 23).

The pressure medium 12 (preferably a circumferentially closed or segmented ring) and the screw bolts 17 in their interaction form in a simple manner a first variant of a device for changing the horizontal spring and thus the rigidity of the centrifuge foot arrangement or the centrifuge foot 4, and their damping effect.

With such an adjustment, however, the vertical spring properties also change to a certain extent. This is because if the contact pressure between the elastic element 11 and the outer ring 24 is increased, the vertical suspension / support also changes due to the increased friction.

To Fig. 3 the inner ring 7 and the outer ring 24 are additionally designed such that the outer ring 24 overlaps the inner ring 7 with an inner ring collar 36 on an outer ring collar 37. In this area, the lower, radially larger section 8 of the inner ring 7 on the outer ring collar 37 and the inner ring collar 36 of the outer ring 24 are designed in steps. In this way, the inner ring 7 is prevented by the outer ring 24 from migrating or being pulled apart vertically upwards in a particularly simple constructive manner. A separate cover element in the manner of element 25 of Fig. 2 is therefore not necessary.

The invention is based on the arrangements of the Fig. 2 and 3rd not limited.

Thus, instead of a single elastic element 11, several of the elastic elements 11, e.g. formed as circumferentially distributed ring segment sections. It would then be advantageous to assign a screw or other device for changing the radial contact pressure to the outer ring 24 to each of these elastic elements 11.

In addition, the device for changing the rigidity could also be designed in a different way.

After the in Fig. 2 and 3rd The illustrated embodiments are changed by a vertically adjustable element, the radial contact pressure of the elastic element 11. However, this can also be implemented in another way, for example with the aid of a wedge element arrangement made of adjustable wedges.

Such a wedge element arrangement is preferably formed by wedge elements 29, 31 lying on top of one another in opposite directions (see Fig. 4 ), which are horizontally adjustable relative to one another in such a way that the vertical height of the entirety of these two wedge elements 29, 31 - that is to say the height of the entire wedge element arrangement - can be varied.

At least one or both of the wedge elements 29, 31 are preferably - as from Fig. 5 can be seen - formed as a ring segment (s) which are arranged circumferentially distributed like a ring / ring-like. In order to adjust the height of the wedge element arrangement, it is expedient if it and the foot support have preferably horizontally extending bores 32, 33 which are aligned with one another and which are each penetrated by a screw bolt 34. The bore 33 in the foot support 7 is preferably a threaded bore and the screw bolt 34 can, for example, rotate through the upper wedge element 31 (axially immovable relative to the wedge element) (the bore of which preferably has no thread).

An abutment element 35 is placed on the foot support (for example, be screwed on), which forms an upper abutment for the wedge element arrangement from the wedge elements 29, 30.

The abutment can also be formed by the foot itself, in which case the abutment element 35 is omitted.

Now in Fig. 4 the screw 34 is rotated, the upper wedge element 31 is displaced horizontally and, accordingly, the lower wedge element 29 is pressed more or less vertically downward on the elastic element 11, which is thereby compressed more or less vertically and accordingly with a higher or lower contact pressure on the outer Ring 24 and the inner foot support 7 acts horizontally. The particular advantage of the arrangement Fig. 4 is the simple horizontal adjustability, so that a partial disassembly of the centrifuge foot arrangement is not necessary for adjustment processes.

In Fig. 4 In addition, part of a separator frame 3 is shown, which is penetrated by the screw bolt 6 and which is fastened in the separator foot by means of a threaded bore 3 '.

The particular advantage of simple horizontal adjustability is also in the further embodiment of the Fig. 6 given, so that here too a partial disassembly of the centrifuge foot arrangement is not necessary for adjustment processes.

In a modification of the embodiment Fig. 2 is after Fig. 6 It is provided that one or more pressure means 12 ', in particular circumferentially distributed pressure means, are horizontally adjustable and act horizontally on the at least one or the elastic elements 11. As a result, one or more of the elastic element (s) 11 are compressed horizontally and act accordingly with a higher or lower contact force on the element 11 and thus the outer ring 24 and on the other hand the inner foot support horizontally.

Here, this is realized in that one or more circumferentially distributed screws penetrate threaded holes at the height of the one or more elastic elements 11 in the ring 24 and directly or via a pressure disk 12 'as pressure medium within the ring 24 on the one or more act on elastic elements 11. The screw heads 39 can protrude from the ring 24 or can be arranged sunk in sections 38 of these bores.

Reference numerals

1

centrifuge

2nd

Hood

3rd

Machine frame

3 '

drilling

4th

Support feet

5

foundation

6

first bolt

7

tiered ring

7a

Drilling the ring

8, 9

Sections of the ring

10th

Contact surface

11

elastic element

12th

Pressure medium

13, 14, 15

Holes

16

thread

17th

Bolts

18th

Circular bearing arrangement

19th

Circular bearing

20th

Elastomer

21, 22

plate

23

Base plate

24th

ring

25th

Cover element

25 '

Line'

26

Bolts

27

mother

29, 31

Wedge elements

32, 33

Tapped holes

34

Bolts

35

Abutment element

36

inner ringing

37

outer collar

38

Sections

39

Screw head

S1 - S4

column

Claims (19)

1. A centrifuge assembly with a centrifuge, preferably separator arrangement, with a drum with a preferably vertical axis of rotation, which is placed onto a rotatable drive spindle that can be rotated by a drive and is preferably surrounded by a hood (2), wherein the drive spindle is mounted rotatably in a machine stand (3) which, in turn, can be installed on a foundation (5) by means of at least one or a plurality of supporting feet (4), wherein each supporting foot (4) has at least one adjustable first elastic element (11) and at least one second elastic, preferably nonadjustable element (18), and wherein the at least one second elastic element (18) is designed in particular for vertical support of the machine stand, characterized in that the at least one adjustable first elastic element (11) is designed for setting the horizontal spring rigidity and damping of the mass/spring system.
2. The centrifuge assembly as claimed in claim 1, characterized in that the first elastic element (11) is supported radially inward and outward on elements (7, 24) of the supporting foot which are movable to a limited extent in relation to one another, and in that the pressure force with which the at least one first elastic element (11) is clamped radially inward and outward on the elements (7, 24) which are movable to a limited extent in relation to one another is variable as a result of the compression of the elastic element.
3. The centrifuge assembly as claimed in claim 1 or 2, characterized in that the at least one adjustable first elastic element (11) is arranged vertically above a nonelastic foot carrier to be damped, preferably a ring (7), and in that the second elastic element is arranged below the foot carrier to be damped.
4. The centrifuge assembly as claimed in one of the preceding claims, characterized in that the at least one first elastic element (11) is of ring-shaped form.
5. The centrifuge assembly as claimed in one of the preceding claims, characterized in that a device for varying the rigidity is provided, which for varying the pressure force of the first elastic element upon a) the foot carrier (7) and b) an abutment, in particular a radial outer ring (24), has a pressure means (12) acting vertically upon the at least one elastic element (11).
6. The centrifuge assembly as claimed in claim 5, characterized in that the pressure means (12) acting vertically upon the elastic element (11) can be adjusted vertically by means of a tool.
7. The centrifuge assembly as claimed in one of the claims 5 or 6, characterized in that the pressure means (12) acting vertically upon the elastic element (11) can be adjusted horizontally by means of a tool.
8. The centrifuge assembly as claimed in one of the preceding claims, characterized in that the pressure means (12) is a ring.
9. The centrifuge assembly as claimed in one of the preceding claims, characterized in that the pressure means is a wedge arrangement which comprises wedges (29, 31) which are adjustable horizontally with respect to one another.
10. The centrifuge assembly as claimed in one of the preceding claims, characterized in that the pressure means (12) acts horizontally upon the at least one elastic element (11) or upon the elastic elements (11).
11. The centrifuge assembly as claimed in one of the preceding claims 5 to 10, characterized in that the abutment is provided as a radially outer ring (24) which surrounds the at least one first elastic element and the foot carrier, and/or in that the elastic element (11) is a compressible elastomeric ring which is arranged between the inner and the outer ring (7, 24).
12. The centrifuge assembly as claimed in one of the preceding claims 8 to 11, characterized in that the ring (7) is a radial inner ring, and in that the radial inner ring (7) has vertically a first lower portion (8) and an upper second portion (9) with a diameter smaller than that of the first portion (8).
13. The centrifuge assembly as claimed in one of the preceding claims 8 to 12, characterized in that the ring (7) is a radial inner ring, and in that a ring-shaped bearing surface (10) is formed on the inner ring (7), and in that the elastic element (11) is arranged on the bearing surface (10), and/or in that the ring-shaped bearing surface (10) is formed on the radial inner ring (7) in the region in which the lower portion has a larger radius than the upper portion (9).
14. The centrifuge assembly as claimed in one of the preceding claims 8 to 13, characterized in that the pressure means (12) preferably designed as a ring, the first elastic element (11) and the ring (7) have vertical bores (13, 14, 15) which are in alignment with one another, and in that screw bolts (17) are inserted in each case into the circumferentially distributed bores (13, 14, 15), by means of which screw bolts the elastic element (11) can be deformed axially to a greater or lesser extent.
15. The centrifuge assembly as claimed in one of the preceding claims 8 to 13, characterized in that the radial inner ring (7) is supported vertically downward on a circular bearing arrangement (18) as a second elastic element, and/or in that the circular bearing arrangement (18) is supported on a baseplate (23).
16. The centrifuge assembly as claimed in one of the preceding claims 8 to 15, characterized in that, furthermore, the outer ring (24) is arranged/formed on the baseplate (23), and/or in that the outer ring (24) is firmly screwed to the baseplate (23).
17. The centrifuge assembly as claimed in one of the preceding claims 8 to 16, characterized in that the vertical height of the outer ring (24) corresponds to the overall height of the circular bearing arrangement, of the inner ring (7), of the elastic element (11) and of the pressure means (12) and of a gap (S4).
18. The centrifuge assembly as claimed in one of the preceding claims 3 to 17, characterized in that an abutment means (35) is provided, in order to prevent the foot carrier from being pulled apart vertically upward.
19. The centrifuge assembly as claimed in one of the preceding claims 3 to 18, characterized in that an annular collar (37, 36) is formed in each case on the inner foot carrier and on the outer ring (24), wherein these annular collars (37, 36), in their interaction, prevent the foot carrier (7) from being pulled apart vertically upward.

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