GB2459588A

GB2459588A - Device for removing and carrying off filtered deposits

Info

Publication number: GB2459588A
Application number: GB0913348A
Authority: GB
Inventors: Thomas Kerl; Franz Spenger
Original assignee: Hans Huber AG Maschine und Anlagenbau
Current assignee: Huber SE
Priority date: 2004-12-20
Filing date: 2005-12-14
Publication date: 2009-11-04
Anticipated expiration: 2025-12-14
Also published as: GB2459588B; GB0525384D0; GB2421200B; GB0913348D0; GB2421200A; DE102004062316A1

Abstract

A device for removing and carrying off filtered deposits from a flowing liquid 2, with two continuous chains 7, which dip into the liquid 2 and which feature chain links (15, figure 2) joined together by means of joints, sieve filter elements 8 arranged between the chains 7. There are at least two deflection rollers 6 as well as a cleaning device for the sieve filter elements 8. The cleaning device comprises a brush 10 and nozzle 11 inside the filter device which sprays water so as to assist the cleaning brush.

Description

DEVICE FOR REMOVING AND CARRYING OFF

FILTERED DEPOSITS

This invention relates to a device for removing and carrying off filtered deposits from a flowing liquid, wastewater for instance, with two continuous chains that dip into the liquid and which feature chain links that are connected by means of joints and sieve filter elements arranged between the chains. The device is equipped with at least two deflection rollers.

A conveyor belt-type filtering device, also known as a revolving rake, for me-chanically cleaning a liquid contaminated with solids and flowing in a channel is known, for instance, from the document EP 0 676 227 Bi. Such devices serve the purpose of mechanically cleaning flowing wastewater where the lower section of the device is submerged in the flowing liquid medium. The wastewater flows through the sieve filter elements secured to the device where the material to be filtered out collects on the sieve filter elements upon which it is transported up-wards out of the liquid. In order to seal off the individual sieve filter elements from each other to a large extent and to be able to convey coarse solids as well as fine-grained filter material out of the liquid, it was correspondingly proposed to arrange the sieve filter elements at a constant slight distance from each other. For this pur-pose, the end faces of the sieve filter elements are bent and have an upturned edge aligned flush with the joint pins of the chain links. The slight spacing between the two upturned edges is retained even when the elements are deflected. The sieve filter elements designed in this way, however, exhibit joint areas which move to-wards each other in the deflection area and can therefore crush the filtered deposits caught in these areas. These points must be cleaned in order to ensure operability of the device and to prevent the impurities/filtered deposits returning to the liquid that has already been cleaned. The device features a brush which is arranged in the area of the upper deflection roller and which rotates in the opposite direction of the chains.

The document DE 103 25 115 also discloses this type of device, which operates with two circulating chains, between which sieve filter elements are secured. In order to be able to filter the deposited material with the sieve filter elements at a constant rate, it is proposed that adjacent sieve filter elements overlap in the run-ning direction of the chain in the area of the joints of the chain links. Overlapping of the sieve filter elements in the area of linear course of the chain is intended to produce a type of labyrinth seal with the aim of achieving virtually complete reten-tion of the filtered deposits. In the area of the chain deflections, the overlapped area of the sieve filter elements opens to a greater or lesser extent depending on the size of the deflection wheel and the type of overlap. A disadvantage of this ar-rangement is that, as a result of the overlaps opening and closing, filtered deposits can be crushed between the individual sieve filter elements and the material can be removed only in part by a cleaning device. The cleaning device is also designed as a brush rotating in the opposite direction of the chains and which is also arranged in the area of the upper deflection roller. The brush releases the filtered deposits from the sieve filter elements and carries them off via a channel out of the device.

In this arrangement, however, it is possible that the released deposited material impacts the sidewalls of the channel and falls back onto the sieve filter elements or into the liquid that has already been cleaned.

The task of this invention is therefore to create a device for removing and carrying off filtered deposits from a flowing liquid, which is essentially maintenance-free while effectively retaining solids and additionally prevents impurities/filtered de-posits remaining in the device or returning to the liquid that has already been cleaned.

The task is solved with devices with characteristics defined in the independent pat-ent claims.

According to the invention, a device for removing and carrying off filtered depos-its from a flowing liquid, wastewater for instance, features two continuous chains, which dip into the liquid as part of their rotary motion. Each of the chains features chain links that are connected by means of joints. Sieve filter elements arranged between the chains are each secured to a chain link of each chain.

In order to ensure effective sealing of the sieve filter elements with respect to each other and therefore maintain consistent filtering of the deposited material, the in-vention proposes that the sieve filter elements are bent over in a radius shape at the first end face with the radius extending about the joint pins of the chain links. The radius forms a slight gap with the second end of the respective adjacent sieve filter element. The rounded shape of the sieve filter elements at their first end facilitates a rolling motion of the sieve filter elements with respect to each other.

A particularly advantageous version of the invention proposes that the gap between two adjacent sieve filter elements is developed linear. For this purpose, the sieve filter elements could exhibit, for example, a folded edge at their second end, allow-ing them to be made simply and cost-effectively while producing a particularly sturdy sieve filter element.

Likewise, it is of advantage when the second end of the sieve filter element is de- veloped in a radius shape and at least partially encompasses the radius of the adja-cent sieve filter element. Consequently, the layout of the gap between two adjacent elements is planiform. For this purpose, the second end of the sieve filter element exhibits, for example, a circular indentation in a folded end face, which at least partly encompasses the radius of the adjacent sieve filter element as a type of joint.

Particularly effective retention of the filtered deposits can be achieved in this way.

It is of particular advantage when the sieve filter element features a plastic coating at least on one end. This coating can avoid excessive wear of the sieve filter ele-ments and therefore increase the service life of the elements.

An inventive sieve filter element can be produced particularly simply when the sieve filter element exhibits perforated filter areas. The perforation can be selected corresponding to the impurities or deposits to be filtered out of the liquid. In addi-tion, certain areas can exhibit a hole pattern while other areas of the sieve filter element remain imperforated.

A particularly advantageous version of the invention proposes that the perforation of the sieve filter element is developed burr-free on both sides, as this can largely prevent impurities adhering to the sieve filter elements.

In order to achieve a particularly effective filtration rate, it is of advantage to de-sign the sieve filter element curved in the direction facing away from the chain.

This feature offers the particular advantage that filtered material adheres particu- larly well to the sieve filter element and can be transported upwards out of the liq-uid.

In order to be able to secure the sieve filter element to the chain links in a particu-larly simple manner, the sieve filter element is closed off with a cover at the ends which face towards the chains. The sieve filter element is secured to the chain links by means of the cover, preferably screwed on. The sieve filter element is therefore fixed, i.e. unmove able, to a chain link at one end of the sieve filter element, mak-ing it an integral part of both chains in the device. It is also possible, however, to secure the sieve filter elements to the chains by means of separate drive elements.

A particularly advantageous further development of the invention proposes that the sieve filter element features lateral cover plates on the side that faces away from the chains. This arrangement can prevent filtered material falling out of the sieve filter elements. This arrangement can in particular also avoid soiling of the chains and therefore reduce cleaning expenditure.

It is of particular advantage when the lateral cover plates also exhibit a radius formed about the joint pins of the chain sprockets and is constantly engaged with a recess, corresponding to the radius, in the respective adjacent cover plate. In this way, the cover plates form the linear course of the chain as well as a continuous sidewall at the deflection point which keeps back impurities/filtered deposits on the sieve filter elements.

It is of particular advantage when at least individual sieve filter elements, for ex-ample every fifth sieve filter element on the side facing away from the chains, is equipped with a rake. Larger or heavier impurities or deposits can be carried off out of the liquid with the aid of the rake in that they are grabbed and lifted out by the rake, which protrudes essentially at right angles from the sieve filter elements.

A further advantageous development of the invention proposes that the chain links are equipped with protective rollers, particularly protective rollers made from plas- tic, via which the chains are engaged with the deflection rollers. The chain is there-fore transported and deflected over the protective rollers. The design layout of the chains with protective rollers as proposed by the invention makes it possible to reduce the requirements in terms of the materials used for the chain sprockets while also reducing the maintenance requirements.

In addition, it is of advantage if a brush for cleaning the mounting of the sieve fil-ter elements and/or the chain and/or for sealing the device is arranged between the lateral ends of the sieve filter element and a housing wall covering the chains. The brushes protrude into the gap between the sieve filter element and housing wall and therefore largely seal off this gap. The brushes are preferably arranged in the area of the liquid on the side of the filtering device facing the flow.

It is of particular advantage when a neoprene tab for improving the sealing effect and/or reinforcement purposes is assigned to the brush. The brushes are stiffened by the neoprene tab, thus improving their cleaning effect.

The brush is preferably set at a slight inclination with respect to the vertical to the base of the device. The neoprene tab is pressed against the brushes by the water pressure, thus additionally stiffening the brushes without impairing the cleaning effect of the brushes.

In an inventive device for removing and carrying away filtered material from a flowing liquid it is of advantage when one of the deflection rollers is arranged in the liquid and is equipped with a maintenance-free bearing in order to reduce fur-ther the maintenance requirements of the device.

It is of particular advantage when the maintenance-free bearing is a ceramic bear-ing. The bearing mount of the deflection roller arranged in the liquid according to the invention no longer requires grease lubrication, thus rendering maintenance of the bearing unnecessary.

Irrespective of the special design layout of the sieve filter elements, in a device for removing and carrying off filtered deposits from a flowing liquid with two con-tinuous chains that are immersed in the liquid and which are connected by means of joints, sieve filter elements arranged between the chains, at least two deflection rollers and a cleaning device for the sieve filter elements it is inventive and of ad-vantage when the cleaning device is a brush rotating in the opposite direction of the sieve filter elements. The inventive, opposing rotation of the brush ensures particu- larly effective release of the deposited material while the rotation of the brush addi-tionally carries the material detached from the brush away from the sieve filter elements.

If a deflector plate is assigned to the brush, this arrangement can both prevent the detached material being flung back and therefore contaminating the liquid already cleaned as well as clean the brush from adherent soiling. It is of particular advan-tage when the brush is arranged between the deflector plate and the chain so that the brush closes off the area to the already cleaned liquid while additionally provid-ing a sealing function.

It is of further advantage when the brush is arranged above the upper deflection roller on the return side of the chain. Advantageously, the brush is designed as a tensioning device for the chains.

The device preferably features a separate drive unit for the chains and for the brush in order to meet the different speed requirements for the chains and brush. Like- wise, however, a common drive unit with speed adaptation through a gear mecha-nism can also be advantageous.

Further advantages of the invention are described by way of illustration of the fol-lowing version examples.

Figure 1 shows a side view of a device according to the invention Figure 2 shows a detailed cross sectional view of the sieve filter ele-ments on the chains as well as of the side cover plates Figure 3 shows a detailed view of the cleaning and sealing brushes on the lateral ends of the sieve filter elements Figure 4 shows a detailed view of the cleaning brush for the sieve fil-ter elements with a deflector plate.

Figure 1 shows a cross section through the side view of a filtering device 1, which is often referred to as a rotary rake. The filtering device 1 is partially submerged in a liquid 2 flowing in the direction indicated by the arrow in a channel 3. The liq-uid 2 is at a higher level upstream of the filtering device 1 than downstream of the filtering device 1 as the water 2 backs up before the filtering device 1 and flows through the filtering device 1 at a slower rate. The filtering device 1 is secured with a bracket 4 to the channel 3. To avoid the formation of deposits, the filtering device 1 is preferably arranged on a ledge 5 at the base of the channel. This ar-rangement improves the hydraulic efficiency. However, the filtering device 1 can also be installed in a channel without a ledge at the base.

The filtering device 1 mainly consists of a conveyor belt which is reversed at two deflection pulleys 6. The continuous conveyor belt consists of two chains 7 running parallel with respect to each other, of which only one chain is illustrated in Fig. 1, and a large number of sieve filter elements 8 mounted on them. On the delivery side, the chains 7 are directed by guides 21, see Fig. 2, in the area submersed in the liquid while the return strand 14 of the chain is not guided. A brush 9, which is shown in Fig. 4, is arranged in the vicinity of each chain 7 on the side facing away from the liquid flow in the area of the lower deflection roller 6. On the one hand, the brush 9 cleans the chain and, on the other hand, provides a seal from the liq- uid 2' as the brushes 9 prevent filtered material flowing past the side of the filter-ing device between the filtering device 1 and the channel 3.

A further driven brush 10 is in the front area below the upper deflection roller 6.

The brush that is illustrated in detail in Fig. 4 removes the filtered material adhered to the sieve filter elements 8 while simultaneously cleaning the sieve filter ele-ments 8. The deposited material detached from the sieve filter elements 8 and the liquid are conveyed via outlet 12 out of the filtering device 1 and fed to a transport device or a waste tank not illustrated.

A rake 13 is mounted on, for example, every fifth sieve filter element in order to be able to convey heavy filtered material, such as stones, out of the liquid 2. The filtered material is held by the rake 13 and likewise carried over the upper deflec-tion roller 6 and falls through outlet 12 into the material removal facility.

Figure 2 shows a detailed view of the design layout of the sieve filter elements 8 on the chains according to the invention as well as the side cover plates 16. Ac-cording to the invention, one end face of the sieve filter elements 8 is bent over in such a way as to form a radius and the radius 18 of a sieve filter element 8 mounted on the chain 7 is arranged concentrically with respect to the joint pin 19 of the corresponding chain links 15. This special shape of the sieve filter ele- ments 8 ensures a constantly small gap with respect to the adjacent sieve filter ele-ments 8 is achieved in any position of the conveyor belt even in the deflection zones. In contrast to the state-of-the-art devices 1, in which the end faces of adja- cent sieve filter elements 8 move towards each other, often posing the risk of fil-tered material being crushed, the rounded sieve filter element 8 according to the invention can rotate in a rolling motion against the adjacent sieve filter element 8.

In the illustrated example, each other end of the sieve filter elements 8 is corre-spondingly bent, thus achieving a constant linear gap between two adjacent sieve filter elements 8. Since none of the faces of the sieve filter elements 8 move to-wards each other, the risk of impurities/filtered deposits being crushed between the sieve filter elements 8 is reduced while the slight gap is still able to hold back the filtered material. The second end of the sieve filter elements 8, however, can also be designed such that it encompasses the area of the adjacent sieve filter element 8 bent over in radius shape as a type of joint. This arrangement can further improve the material retention efficiency. In addition, the rolling motion can reduce the wear of the sieve filter elements 8, particularly when they additionally feature a plastic coating. The coating is preferably developed only in the area of the gap, i.e. the radius 18 or the bend 20 of the sieve filter elements; however, the entire sieve filter element 8 can also be coated.

Cover plates 16 which prevent the filtered material dropping down the side are arranged at the ends of the sieve filter elements 8 on the side facing away from the chains. The cover plates 16 are preferably made from plastic so that they can be produced inexpensively. In the example shown here, the cover plate 16 is also formed in a radius shape at the one end such that the radius encompasses the joint pins. At their other end, the cover plates 16 feature a recess corresponding to the radius. Consequently, two adjacent cover plates 16 are constantly engaged both at deflection as well as along the linear course of the chain and form a closed sidewall which holds back the filtered material on the sieve filter elements 8, thus prevent- ing recontamination of the liquid already cleaned. This arrangement can also pre-vent soiling of the chains and therefore reduce the cleaning requirements.

Joint pins 19, with which the chain links 15 of the chain 7 are joined together in an articulated arrangement, engage in the recesses 23 of the deflection roller 6 for the purpose of driving and reversing the conveyor belt. The length of the chain links 15 essentially corresponds to the length of a sieve filter element 8. To reduce wear in this example, protective rollers 22 are mounted on the joint pins 19, via which the joint pins 19 engage with the deflection rollers 6. This arrangement can considerably reduce the wear on the deflection rollers. The maintenance expendi- ture is reduced by the extended change intervals for the chain sprockets. In addi-tion, the material requirements relating to the deflection rollers 6 can be reduced.

This arrangement also achieves more effective slide action of the protective roll-ers 22 and rolling action on the chain guide surfaces 21.

The bearing of the lower deflection roller 6 is preferably designed as a ceramic plain bearing 31 (illustrated with dashed lines) so that it is maintenance-free. In contrast to conventional, state-of-the-art roller bearings, this bearing 31 requires no grease lubrication thus rendering maintenance unnecessary. In addition, the bearing mount corresponding to the invention is less susceptible to the liquids to be filtered and has a longer service life.

By making the bearing from ceramic material, compared to the state-of-the-art bearing it is also largely unsusceptible to soiling.

The surface of the sieve filter elements 8 is curved so as to accept the filtered ma-terial more effectively. In addition to the curvature of the sieve filter element 8, the radius 18 and the bend 20 serve to stabilise the sieve filter element 8. Reinforce-ment plates (not illustrated here) can be arranged in the longitudinal direction of the sieve filter elements 8 on the side facing towards the chains 7. The filter sur-faces of the sieve filter element 8 are perforated where the perforation of the sieve filter element 8 is preferable burr-free on both sides in order to avoid the adhesion of soiling and impurities. This can be achieved, for example, by producing the perforation in a punching operation and the rear side of the elements 8 is subse-quently brushed. The sieve filter elements 8 may remain imperforated in the joint areas so as to avoid the risk of the impurities/filtered deposits being caught and crushed in the gap.

By way of example, a cover 25 is illustrated hatched on a sieve filter element.

Such a cover 25 is arranged on both ends of the sieve filter element 8 facing to- wards the chains 7 and closes off the side of the sieve filter element 8. The coy-ers 25 are welded to the sieve filter element 8. Screws 26 secure the cover 25 and therefore the sieve filter element 8 to a chain link 15, thus fixing the sieve filter element 8 to the chain 7. The two chains 7 are firmly connected in a parallel ar- rangement with each other via the sieve filter elements 8 so that a rigid unit is cre- ated which is articulated only at the joints of the chain links 15, that are also ar-ranged axially with respect to each other, and therefore can be reversed about the deflection sprockets.

Figure 3 shows a detailed view of the cleaning and sealing brushes 9 on the lateral ends of the sieve filter elements 8 in the area of the bottom reversal point. The brush 9 is arranged to the side of the sieve filter elements in the gap between the cover 25 and a -not illustrated -housing wall and therefore largely seals off the gap so that impurities in the liquid, that are to be filtered out in the filtering de-vice 1, cannot penetrate the gap. The brush 9 therefore also ensures that the area behind the sieve filter element 8 is largely sealed off from solids and therefore fa-cilitates outstanding cleaning or filtering of the liquid. The brush 9 also cleans the chain 7 and the mounting of the sieve filter elements.

In the version represented here, a neoprene tab 27 is assigned to the brush 9. The neoprene tab 27 stiffens the brushes 9 so as to improve their cleaning effect. In addition, the neoprene tab 27 protects the brushes from soiling and impurities, which could damage the brushes, thus extending their service life. The arrow mdi-cates the direction of flow onto the sieve filter elements 8. The brush 9 is arranged at a slight incline with respect to the vertical. This arrangement ensures that the water pressure presses the neoprene tab 27 against the brush 9, thus additionally stiffening it without impairing the cleaning effect of the brushes. In addition, the neoprene tab 27 protects the brushes 9 from impurities, which could damage the brushes, thus extending their service life.

Figure 4 shows a detailed view of the cleaning brush 10 for the sieve filter ele-ments 8 with a deflector plate 28 in an arrangement according to the invention.

Consequently, the brush 10 rotates in the opposite direction to the movement of the chains 7 as indicated by the arrows. This arrangement achieves a particularly effec-tive cleaning effect. The risk of detached material being flung back onto the sieve filter elements 8 by the brush 10 is already reduced by the rotation in the opposite direction as the detached material is moved away from the sieve filter elements. A deflector plate 28 is assigned to the brush 10, at which the detached material is scraped off, thus cleaning the brush 10. The brush is preferably arranged in the gap between the deflector plate 28 and the sieve filter elements 8 SO that it seals off the gap from the liquid to be cleaned! filtered. This arrangement also largely pre-vents filtered material falling back into the cleaned liquid, thus further reducing the maintenance requirements of the device 1.

The brush 10 is preferably arranged at the return strand 14 of the chains 7 in the area beneath the upper deflection roller 6 so that the brush also serves as the ten-sioning device for the chains. The chains 7 can be tensioned by the bristles or by a brush 10 with adjustable feed. If necessary, spray nozzles 11 can be provided to additionally clean the sieve filter elements and remove the filtered material from the sieve filter elements 8. For this purpose, several nozzles 11 spray a liquid from the inside of the filtering device 1 against the sieve filter elements 8 and therefore clean the sieve holes as well as the inside of the sieve filter elements 8. The brush 10 rotates at approximately 10 times the speed of the chain drive so that it preferably has its own drive unit.

This invention is not restricted to the illustrated version examples. Variations or modifications, particularly in the design of the sieve filter elements fall into the scope of protection of this invention corresponding to the formulation of the patent claims.

Claims

CLAIMS1. Device for removing and carrying off filtered deposits from a flowing liquid (2), waste water for instance, with two continuous chains (7) that dip into the liquid (2) and which feature chain links (15) connected by means of joints, sieve filter elements (8) arranged between the chains (7), at least two deflection rollers (6) as well as a cleaning brush (10) for the sieve filter elements (8), characterised such that spray noz-zles (11) are provided at the inside of the filtering device (1) and that the nozzles (11) are arranged before the cleaning brush (10) referring to the moving direction of the sieve filter elements (8).
2. Device in accordance with the previous patent claim, characterised such that the cleaning brush (10) is rotating in the opposite direction to the movement of the chains (7) and the sieve filter elements (8).
3. Device in accordance with one or several of the previous patent claims, characterised such that a deflector plate (28) for guiding the displaced filtered deposits is assigned to the brush (10).
4. Device in accordance with one or several of the previous patent claims, characterised such that the brush (10) is arranged between the deflector plate (28) and the chain (7).
5. Device in accordance with one or several of the previous patent claims, characterised such that the brush is designed as a tensioning device for the chains (7).
6. Device in accordance with one or several of the previous patent claims, characterised such that the device (1) features separate drive units for the chains (7) and the brush (10).
7. Device in accordance with one or several of the previous patent claims, characterised such that the device (1) features a common drive unit for the chains (7) and the brush (10).
8. Device (1) for removing and carrying off filtered deposits from a flow-ing liquid (2), waste water for example, with two continuous chains (7) that dip into the liquid (2) and which feature chain links (15) that are connected by means of joints, sieve filter elements (8), which are se-cured to a chain link (15) of each chain (7), arranged between the chains (7) and at least two deflection rollers (6), characterised such that for the purpose of sealing the sieve filter elements (8) with respect to each other, the sieve filter elements (8) are bent over in the form of a radius at one end face where the radius (18) is formed about the joint pins (19) of the chain links (15) and forms a slight gap with the other end of the respective adjacent sieve filter element (8).
9. Device in accordance with Patent Claim 1, characterised such that the layout of the gap between two adjacent sieve filter elements (8) is lin-ear.
10. Device in accordance with one or several of the previous patent claims, characterised such that the layout of the second end of the sieve filter element (8) is radius-shaped and at least partially encompasses the ra-dius (18) of the adjacent sieve filter element (8).
11. Device in accordance with one or several of the previous patent claims, characterised such that the sieve filter element (8) has a plastic coating at least on one end.
12. Device in accordance with one or several of the previous patent claims, characterised such that the sieve filter element (8) features perforated sieve surfaces.
13. Device in accordance with one or several of the previous patent claims, characterised such that the perforation covers only part areas of the sieve filter element (8).
14. Device in accordance with one or several of the previous patent claims, characterised such that the perforation of the sieve filter element (8) is provided on both sides free of burrs.
15. Device in accordance with one or several of the previous patent claims, characterised such that the ends of adjacent sieve filter elements (8) fac-ing each other are non-perforated in the area of the gap.
16. Device in accordance with one or several of the previous patent claims, characterised such that the sieve filter element (8) has a curved form in the direction away from the chain (7).
17. Device in accordance with one or several of the previous patent claims, characterised such that the sieve filter element (8) is closed off with a cover (25) at the ends which face towards the chains (7).
18. Device in accordance with one or several of the previous patent claims, characterised such that the sieve filter element (8) is secured to the chain links (15) by means of the covers (25).
19. Device in accordance with one or several of the previous patent claims, characterised such that the sieve filter element (8) features lateral cover plates (16) on the side which faces away from the chains (7).
20. Device in accordance with one or several of the previous patent claims, characterised such that the lateral cover plates (16) exhibit a radius formed about the joint pins (19) of the chain links (15) and is constantly engaged with a recess, corresponding to the radius, of the respective ad-jacent cover plate (16).
21. Device in accordance with one or several of the previous patent claims, characterised such that at least several of the sieve filter elements (8) feature a rake (13) on the side which faces away from the chains (7).
22. Device in accordance with one or several of the previous patent claims, characterised such that the chain links (15) are equipped with protective rollers (22), in particular protective rollers (22) made from plastic, via which the chains (7) are engaged with the deflection rollers (6).
23. Device in accordance with one or several of the previous patent claims, characterised such that a brush (9) for cleaning the mounting of the sieve filter elements (8) and/or of the chain (7) and/or for sealing the device (1) is arranged between the lateral ends of the sieve filter ele-ments (8) and a housing wall covering the chains (7).
24. Device in accordance with one or several of the previous patent claims, characterised such that a neoprene tab (27) for improving the sealing ef-fect and/or for reinforcement purposes is assigned to the brush (9).
25. Device in accordance with one or several of the previous patent claims, characterised such that the brush (9) features an inclined position with respect to the vertical.
26. Device in accordance with one or several of the previous patent claims, characterised such that one of the deflection rollers (6) is arranged in the liquid (2) and is equipped with a maintenance-free bearing.
27. Device in accordance with one or several of the previous patent claims, characterised such that the maintenance-free bearing is a ceramic plain or friction bearing (31).
28. Device for removing and carrying off filtered deposits from a flowing liquid (2), waste water for instance, with two continuous chains (7) that dip into the liquid (2) and which feature chain links (15) connected by means of joints, sieve filter elements (8) arranged between the chains (7), at least two deflection rollers (6) as well as a cleaning device for the sieve filter elements (8), characterised such that the cleaning de-vice is a brush (10) rotating in the opposite direction of the sieve filter elements (8).
29. Device in accordance with the previous patent claim, characterised such that a deflector plate (28) for guiding the displaced filtered deposits is assigned to the brush (10).
30. Device in accordance with one or several of the previous patent claims, characterised such that the brush (10) is arranged between the deflector plate (28) and the chain (7).
31. Device in accordance with one or several of the previous patent claims, characterised such that the brush is designed as a tensioning device for the chains (7).
32. Device in accordance with one or several of the previous patent claims, characterised such that the device (1) features separate drive units for the chains (7) and the brush (10).
33. Device in accordance with one or several of the previous patent claims, characterised such that the device (1) features a common drive unit for the chains (7) and the brush (10).
34. Device for removing and carrying off filtered deposits from a flowing liquid substantially as shown in the accompanying drawings.