EP1827700B1 - Centrifuge basket for a screen centrifuge - Google Patents

Abstract

A centrifuge basket for a sieve centrifuge, especially a sieve worm or oscillating centrifuge, comprises an outer conical basket (11), and sieve elements (12). The sieve elements are fixed to the basket at their front and rear edges using a clamping section (13).

Description

The invention relates to a centrifuge basket for a sieve centrifuge, in particular a Siebschnecken-, thrust or vibrating screen centrifuge, with an outer conical basket and basket insert in the basket sieve segments, wherein the sieve segments are fixed at its front edge by at least one clamping member under force on the support basket.

Such a centrifuge basket is from the DE 29 51 556 A1 known.

Furthermore, the invention relates to a method for mounting a centrifuge basket with a Siebsegmente receiving basket and a centrifuge with such a centrifuge basket.

There are centrifuge baskets for screening centrifuges of the aforementioned type known. Such sieve centrifuges are used for the separation of solids and liquids, for example in coal drying. Such Siebzentrifugen with a substantially conical shape are fed in the region of the rear edge, that is, at the smaller diameter of the centrifuge basket with the material to be dried. At the front edge, that is at the large diameter of the substantially conical centrifuge basket, the material to be dried is discharged. The centrifuge baskets for such sieve centrifuges are essentially formed by an outer conical basket or holding basket and a the inner dimension of the carrier basket adapted, also conical sieve. This sieve, the shape of which corresponds to a conical surface section, is formed from a plurality of sieve segments, which are rolled from planar sieve preforms onto the radius of the holding basket and thereafter be welded together. In the area of the welds of the adjacent sieve segments, as a result of the action of heat due to the welding, the sieve segments are deformed in the edge zones, so that both the inner and the outer contours of the sieve insert have severe shape inaccuracies, so that the welded sieve insert requires elaborate reworking. As a result of the shape deviations of the sieve insert in the area of the welds of the sieve segments, an increased wear occurs during operation.

Particularly disadvantageous in the known constructions is thus the elaborate production of the screen baskets, which requires a welding of individual screen segments as well as a reworking in the area of the welds, whereby this area of the welds is subject to increased wear during operation.

A further disadvantage is that with uneven wear replacement of individual sieve segments is impossible, but instead each of the entire sieve insert must be replaced.

A particular disadvantage here is that for the replacement of the sieve previously a disassembly of all projecting into the cone interior of the centrifuge basket components such as inlet pipe, distributor, screw, etc. is required.

Another disadvantage is that in each case the complete prefabricated screen basket must be introduced during assembly in the carrying basket, which requires a complicated handling.

The object of the invention is to provide a centrifuge basket for a sieve centrifuge, which has a lower wear and tear during operation and thus a higher creep with simplified and cheaper production and assembly.

Another object of the invention is to provide a simplified method for mounting a centrifuge basket.

The object is achieved in that in a centrifuge basket for a sieve centrifuge, in particular a Siebschnecken-, thrust or Schwingsiebzentrifuge, with an outer conical basket and basket insert sieve segments, the sieve segments at its front edge by at least one clamping member under adhesion to the basket are fixed, wherein the support basket has at its rear edge an annular groove into which the sieve segments are inserted in a form-fitting manner.

It is advantageous that the support basket has at its rear edge, that is in the region of the smaller diameter, an annular groove into which the sieve segments can be inserted in a form-fitting manner.

As a result, an inexpensive to be produced mounting aid in the form of a threading and at the same time an end-side fixation of the sieve segments is created, which facilitates assembly and only requires the installation of a clamping member on the easily accessible front edge for fixing the sieve segments.

The fact that the Slebsegmente be fixed at its front edge, ie in the region of the larger diameter of the conical shape by at least one clamping member under adhesion to the basket, a centrifuge basket is created, which allows to fix individual sieve segments on the support basket, without it It is necessary to weld the sieve segments to one another, which on the one hand simplifies production and assembly and on the other hand improves the creep behavior of the centrifuge basket during operation, since the omission of welding does not lead to dimensional inaccuracies of the sieve segments as a result of heat influence. It is also possible in the centrifuge basket according to the invention to replace individual sieve segments without having to replace the entire sieve insert in the centrifuge basket.

• Einlegen der Siebsegmente in den Tragkorb,
• Positionieren der Siebsegmente mit einem Hilfswerkzeug, insbesondere mittels eines innen einlegbaren Klemmrades, dessen Außenumfang an den Siebsegmenten anliegt,
• Fixieren der Siebsegmente mittels mindestens eines oder mehrerer Klemmteile und/oder Klemmschienen unter Kraftschluss am Tragkorb.

The further object of the invention is achieved by a method for mounting a centrifuge basket with a sieve segments receiving basket or holding basket with the following steps:

• Inserting the sieve segments into the carrying basket,
• Positioning the sieve segments with an auxiliary tool, in particular by means of a clamping wheel which can be inserted internally, the outer circumference of which rests against the sieve segments,
• Fix the sieve segments by means of at least one or more clamping parts and / or clamping rails under adhesion to the basket.

With the centrifuge basket according to the invention for a sieve centrifuge and the inventive method for mounting a centrifuge basket with a Siebsegmente receiving basket (holding basket), thus a centrifuge basket is created which has a simple construction and a simple structure and allows easy handling and installation.

It is particularly advantageous that it is possible to replace individual sieve segments without having to disassemble all projecting into the cone interior of the centrifuge basket components.

Further advantageous embodiments of the invention are specified in the subclaims.

Preferably, the sieve segments on the sides adjacent to two adjacent sieve segments have no connections or attachments to the adjacent sieve segment, that is, the sieve segments are mutually free of connections. This makes it possible to replace individual sieve segments.

Alternatively, however, it is possible that two adjacent sieve segments have a positive connection with one another, for example in the form of a sieve segment engages over the adjacent sieve segment in sections or over the entire length and additionally fixes it along a coaxial line.

It is advantageous if the sieve segments at their front and / or rear edge at least one projection, in particular a plurality of individual spaced-apart projections which / which can be engaged by a clamping part / are. In particular, one or more projections may be welded to the screen segments.

In the case of a plurality of projections arranged on the sieve segments, which can be overlapped by clamping parts, these can be arranged equidistantly, so that a uniform fixation of the sieve segments is possible in the circumferential direction.

Thus, it is possible to attach the required for the assembly of the sieve segments projections that are overlapped by a clamping part, already to attach to the planiform Siebvorformlingen in particular and then to deform the prefabricated sieve segment to the conical shape of the holding basket.

Alternatively, the overlapping projection on the sieve segments may be formed by a ring segment, wherein in particular the arc length of the ring segment corresponds to the arc length of the sieve segment edge, that is to say that this ring segment extends over the entire width along the arc line.

Preferably, the fastened to the carrier basket clamping part is formed by a clamping ring or clamping ring segments. The fastened to the basket clamping member may have a screw with the basket.

In the embodiment with a clamping ring this can be fastened by equidistantly arranged screws on the support basket. By means of the conical clamping surface of such a clamping ring, a fixing of the sieve segments against the holding basket, due to the inclination of the clamping surface against the axis of the centrifuge basket both in the axial direction and in the circumferential direction.

Preferably, the sieve segment or the projection on the sieve segment and the / the clamping part / clamping parts on an identical inclination against the axis of the centrifuge basket and thus form a conical seat. This results in a support surface in the form of a conical surface portion with a very high stability due to the created contact surface.

In a preferred embodiment, the clamping part has an inclination against the axis of the centrifuge basket, which corresponds to half the opening angle of the centrifuge basket.

Cumulatively to the features described above, the sieve segments are fixed by means of coaxially extending clamping rails under adhesion to the carrier basket, wherein the clamping rails in the region of the sides of two adjacent sieve segments on the support basket can be fastened.

Preferably, the clamping rails and / or the clamping part are detachably connected by means of screwing with the support basket;

Using coaxial clamping rails the same advantages are achieved as in the fixation of the sieve segments at its front and / or rear edge on the basket.

Preferably, the sieve insert of the centrifuge basket is formed from four to twelve, preferably six segments.

For special applications, it is advantageous if the sieve segments are slotted sieve segments.

The sieve segments can be covered with a wear protection layer in the rear region, that is to say in the region of the smaller diameter at which the material to be dried is fed. This wear protection layer may be a polyurethane layer.

Also, the screen segments and / or the clamping parts may have a coating against wear.

Preferably, the carrying basket or holding basket is carried self-supporting and / or manufactured in one piece by rolling or casting. On its peripheral surface, which corresponds to a conical surface portion, the basket can have openings.

Fig. 1

einen Zentrifugenkorb für eine Siebzentrifuge mit einem äußeren konischen Tragkorb und im Tragkorb einliegenden Siebsegmenten in perspektivischer Ansicht,

Fig. 2

den Zentrifugenkorb nach Fig. 1 in Frontansicht,

Fig. 3

Schnitt III-III nach Fig. 2,

Fig. 4

Detail IV nach Fig. 3,

Fig. 5

Detail V nach Fig. 3,

Fig. 6

Draufsicht auf ein Siebsegment mit ringsegmentförmigem Vorsprung,

Fig. 7

Draufsicht auf ein Siebsegment mit mehreren Vorsprüngen,

Fig. 8

Seitenansicht eines Vorsprungelementes zur Montage an einem Siebsegment gemäß Fig. 7,

Fig. 9

perspektivische Ansicht eines Vorsprungelementes zur Montage an einem Siebsegment gemäß Fig. 7,

Fig. 10

Detailansicht einer zweiten Ausführungsform der Siebsegmentfixierung,

Fig. 11

Detailansicht einer dritten Ausführungsform der Siebsegmentfixierung,

Fig. 12

Zentrifugenkorb in einer weiteren Ausführungsform in perspektivischer Ansicht,

Fig. 13

Detail XIII nach Fig. 12,

Fig. 14

Draufsicht auf ein Siebsegment nach Fig. 12,

Embodiments of the invention are illustrated in the drawings and will be explained in more detail below. Show it:

Fig. 1

a centrifuge basket for a sieve centrifuge with an outer conical basket and sieve segments in the basket insert in perspective view,

Fig. 2

the centrifuge basket Fig. 1 in front view,

Fig. 3

Section III-III after Fig. 2 .

Fig. 4

Detail IV after Fig. 3 .

Fig. 5

Detail V after Fig. 3 .

Fig. 6

Top view of a sieve segment with ring segment-shaped projection,

Fig. 7

Top view of a sieve segment with several projections,

Fig. 8

Side view of a projection element for mounting on a screen segment according to Fig. 7 .

Fig. 9

Perspective view of a projection element for mounting on a screen segment according to Fig. 7 .

Fig. 10

Detail view of a second embodiment of the sieve segment fixation,

Fig. 11

Detail view of a third embodiment of the sieve segment fixation,

Fig. 12

Centrifuge basket in a further embodiment in perspective view,

Fig. 13

Detail XIII after Fig. 12 .

Fig. 14

Top view of a sieve segment after Fig. 12 .

The centrifuge basket for a sieve centrifuge Fig. 1 is formed by an outer basket or holding basket 11, with a conical shape and in this basket 11 inlaid sieve segments 12. At the front end, that is the larger diameter of the support basket 11, the sieve segments 12 by means of a sieve segments 12 cross clamping ring 13 under adhesion fixed to the basket. The sieve segments 12 have on the sides, with which two adjacent sieve segments 12, 12b adjacent to the line 100, no connections or attachments with each other. The clamping ring 13 is fixed by means of equidistantly arranged on the circumference of screws 14 on the support basket 11. The Fig. 2 and 3 show the centrifuge basket Fig. 1 in further views. In the in Fig. 3 shown section III-III after Fig. 2 is in the rear area, that is in the area of smaller diameter, the Centrifuge basket on the screen segments to the inside arranged wear protection layer 15 recognizable. In this area, the supply of the material to be dried takes place.
In Fig. 4 represented is the detail IV after Fig. 3 , the design of the rear edge of the support basket 11 can be seen. At the rear edge of the support basket 11 is disposed a flange 11a with a circumferentially circumferential cone-shaped groove 11b. The circumferential recess in the flange 11 a forms in addition to the cone groove 11 b at the same time a contact shoulder 11 c. Cone groove 11b and contact shoulder 11c serve the axial and radial fixation of the sieve segment 12 and at the same time the centering of the sieve segment 12 in the holding basket 11th

In Fig. 5 shown is the detail V after Fig. 3 , The sieve segment 12 has at its front end to a terminal block 12 a, with which it rests on the support basket 11. By means of the clamping ring 13, the screen segment 12 is fixed non-positively on the support basket 11. The clamping ring 13 has a conical surface 13 a, which rests on the clamping bar 12 a of the sieve segment 12, wherein this conical surface 13 a of the clamping ring 13 have the same inclination as the clamping bar 12 a against the axis of the centrifuge basket, so that a circumferential contact surface in the form of a Tapered section results. Thus, a fixing of the sieve segment 12 by the clamping ring 13 takes place simultaneously in the radial and axial directions. The clamping ring 13 is screwed by means of screws 14 to a arranged on the front edge of the support basket 11 11d flange.

Fig. 6 shows a plan view of a sieve segment 12 with a over the entire arc length of the front edge of the sieve segment 12 extending terminal block 12a, which is overlapped by the clamping ring 13. In the rear area, the sieve segment 12 is covered by a wear protection layer 15.

Fig. 7 shows an alternative embodiment of a sieve segment 22 with a wear protection layer 15 and a plurality of equidistantly arranged projections 22a.

Fig. 8 shows a side view of a projection element 22a for attachment to a sieve segment 22 according to Fig. 7. Fig. 9 shows such a projection element 22a in a perspective view. The projection element 22a has a chamfered surface 22b, which can be engaged by a clamping part or a clamping ring and by means of which it can be fixed under adhesion to the support basket.

Fig. 10 The clamping ring 33 has for this purpose a cone-shaped bearing surface 33a, the inclination against the axis of the centrifuge basket of the inclination of the sieve segment 32 against the axis of the Centrifuge basket corresponds, so that a circumferential contact surface is formed in the form of a conical surface portion. Thus, a non-positive fixation of the screening segment 32 against the support basket 31 takes place both in the radial and in the axial direction. The clamping ring 33 is screwed by means of screws 34 against the arranged at the front end of the support basket 31 flange 31 d. The screen segment 32 is a slot screen, the struts 32b are mounted on cross beams 32c.

Fig. 11 shows a further embodiment of the fixation of a screen segment 42 under adhesion to the support basket 41. This is in the sieve segment 42 is a slotted screen, the struts 42b are arranged on cross members 42c. In the region of the front end of the screening segment 42, a flat iron 46 is arranged. The sieve segment 42 rests with the flat iron 46 and the cross members 42 c on the support basket 41. The fixation on the support basket by means of a, in the circumferential direction of the arc length of the screen segment 42 corresponding flat iron 46 cross clamping ring 43 which has a correspondingly shaped conical surface 43 a. The clamping ring 43 is screwed by means of screws 44 against the arranged at the front end of the support basket 41 41d flange.

Fig. 12 shows a further embodiment of the centrifuge basket according to the invention in a perspective view with a carrying basket 51, in which Insert sieve segments 52. The sieve segments 52 are fixed by means of coaxially extending clamping rails 56 under adhesion to the support basket 51. At the rear end 57, the carrying basket 51 has a circumferential centering groove for receiving the rear end of the sieve segments 52.

Fig. 13 shows part XIII Fig. 12 , The sieve segments 52 are located inside in the carrying basket 51 and have on their sides to the adjacent sieve segment toward projections 52a, 52b, which are overlapped by the terminal block 58. The terminal strips 56 are fixed by screws 54 on the support basket 51. The arrangement of the screw connections of the terminal strip 56 on the outside of the carrier basket 51, the terminal strips on the inside a smooth surface, so that premature wear is avoided.

Fig. 14 shows a sieve segment 52 in the plan view, with the arranged on the side adjacent to the adjacent screen segment projections 52a, 52b, which can be formed in the case of Spaltsiebsegmenten simply by correspondingly longer listed cross sections.

Claims (21)

1. Centrifuge basket for a sieve centrifuge, in particular a sieve-worm centrifuge, a pusher centrifuge or a vibratory centrifuge, comprising an outer conical support basket (11, 31, 41, 51, 61) and sieve segments (12, 22, 32, 42, 52, 62) inserted in the support basket (11, 31, 41, 51, 61), the sieve segments (12, 22, 32, 42, 52, 62) being fixed to the support basket (11, 31, 41, 51, 61) at their front edge in a frictional connection by means of at least one clamping part (13, 33, 43, 53, 63), characterised in that the support basket (11, 31, 41, 51, 61) comprises an annular groove (11 a) on its rear edge, into which groove the sieve segments (12, 22, 32, 42, 52, 62) are inserted with a positive fit.
2. Centrifuge basket according to claim 1, characterised in that the support basket (11, 31, 41, 51, 61) comprises on its rear edge a circumferential or segmented contact shoulder (11c) which engages the sieve segments (12, 22, 32, 42, 52, 62) from behind and/or above.
3. Centrifuge basket according to either claim 1 or claim 2, characterised in that the sides (100) of the sieve segments (12, 22, 32, 42, 52, 62) which adjoin two adjacent sieve segments (12, 22, 32, 42, 52, 62) are not connected or attached to the adjacent sieve segment (12, 22, 32, 42, 52, 62).
4. Centrifuge basket according to either claim 1 or claim 2, characterised in that the sides of the sieve segments (12, 22, 32, 42, 52, 62) which adjoin two adjacent sieve segments (12, 22, 32, 42, 52, 62) are connected with a positive fit to the adjacent sieve segment (12, 22, 32, 42, 52, 62).
5. Centrifuge basket according to any of the preceding claims, characterised in that the sieve segments (12, 22, 32, 42, 52, 62) comprise on their front and/or rear edge at least one projection (12a), in particular a plurality of individual mutually spaced projections (22a), which can be engaged from above by a clamping part (13, 33, 43, 53, 63).
6. Centrifuge basket according to claim 5, characterised in that the projection which can be engaged from above is formed by an annular segment (12a), the curve length of the annular segment (12a) in particular corresponding to the curve length of the sieve segment edge.
7. Centrifuge basket according to any of the preceding claims, characterised in that the clamping part (13, 33, 43, 53, 63) which can be attached to the support basket (11, 31, 41, 51, 61) is formed by a clamping ring (13, 33, 43, 53, 63) or clamping ring segments.
8. Centrifuge basket according to any of claims 5 to 7, characterised in that the sieve segment (12, 22, 32, 42, 52, 62) or the projection on the sieve segment (12, 22, 32, 42, 52, 62) and the clamping part(s) (13, 33, 43, 53, 63) are identically inclined in relation to the axis of the centrifuge basket and in particular form a conical seat.
9. Centrifuge basket according to any of the preceding claims, characterised in that the clamping part (13, 33, 43, 53, 63) has an inclination in relation to the axis of the centrifuge basket which corresponds to half the opening angle of the centrifuge basket.
10. Centrifuge basket according to any of the preceding claims, characterised in that the sieve segments (12, 22, 32, 42, 52, 62) are fixed to the support basket (11, 31, 41, 51, 61) in a frictional connection by means of coaxial clamping rails (56), the clamping rails (56) being attached to the support basket (11, 31, 41, 51, 61) in the region of the sides of two adjacent sieve segments (12, 22, 32, 42, 52, 62).
11. Centrifuge basket according to any of the preceding claims, characterised in that the clamping rails (56) and/or the clamping part (13, 33, 43, 53, 63) are releasably connected to the support basket (11, 31, 41, 51, 61) by means of a screw connection.
12. Centrifuge basket according to any of the preceding claims, characterised in that the sieve is formed of 4 to 12, preferably 6, sieve segments (12, 22, 32, 42, 52, 62).
13. Centrifuge basket according to any of the preceding claims, characterised in that the sieve segments (12, 22, 32, 42, 52, 62) are wedge wire sieve segments.
14. Centrifuge basket according to any of the preceding claims, characterised in that the rear region of the sieve segments (12, 22, 32, 42, 52, 62) is covered with an anti-abrasion layer (15), in particular a polyurethane layer.
15. Centrifuge basket according to any of the preceding claims, characterised in that the sieve segments (12, 22, 32, 42, 52, 62) and/or the clamping part(s) (13, 33, 43, 53, 63) comprise a coating to protect against abrasion.
16. Centrifuge basket according to any of the preceding claims, characterised in that the support basket (11, 31, 41, 51, 61) is self-supporting.
17. Centrifuge basket according to any of the preceding claims, characterised in that the support basket (11, 31, 41, 51, 61) comprises openings on its circumferential surface.
18. Centrifuge, in particular a sieve-worm centrifuge, a pusher centrifuge or a vibratory centrifuge, characterised by a centrifuge basket according to any of the preceding claims.
19. Method for assembling a centrifuge basket according to any of claims 1 to 18, comprising a support basket (11, 31, 41, 51, 61) which receives sieve segments (12, 22, 32, 42, 52, 62), characterised by the following steps:

    • inserting the sieve segments (12, 22, 32, 42, 52, 62) into the support basket (11, 31, 41, 51, 61),

    • positioning the sieve segments (12, 22, 32, 42, 52, 62) using an auxiliary tool, in particular by means of a clamping wheel which can be inserted inside, the outer circumference of which rests on the sieve segments (12, 22, 32, 42, 52 62),

    • fixing the sieve segments (12, 22, 32, 42, 52, 62) to the support basket (11, 31, 41, 51, 61) in a frictional connection by means of at least one or a plurality of clamping parts (13, 33, 43, 53, 63) and/or clamping rails (56).
20. Method according to claim 19, characterised in that the sieve segments (12, 22, 32, 42, 52, 62) are worked onto the radius of the support basket (11, 31, 41, 51, 61) from planar sieve preform parts.
21. Method according to either claim 19 or claim 20, characterised in that the sieve segments (12, 22, 32, 42, 52, 62) are provided, in particular in the rear region, with an anti-abrasion layer (15), in particular with a polyurethane layer.

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