DE19919689C2 - Filter stage rake for collecting and dispensing solid components from flowing liquids - Google Patents

Description

The invention relates to a filter stage rake for collecting and dispensing solid components from flowing liquids, especially waste water, according to the preamble of claim 1.

A filter stage rake is known from EP 0 221 991 B1, in which a rake is integrated, which consists of a fixed and a movable git terrost composed. These are each made up of a number render slats formed, the slats of the movable and the fixed grid always arranged alternately in the rake and that of Surfaces facing the flow direction of the lamellae of both gratings stu are feniform. The trajectory of the movable grating is a closed circular path, the upward movement component et which is larger than the step height of the fixed slats.

The disadvantage of this known filter stage rake is that it only can be set up with an angle of attack of approximately 45 °, which makes a considerable amount of space is required, especially in the case of deep channels. Also ready tet sand, which is regularly found in municipal and industrial wastewater certain quantities is included, with such systems considerable difficulties. Parts of the sand that are compared to the suspended matter contained in the waste water and solids have a higher weight, is deposited on the bottom of the device nes off. This sand is not washed away by the rake. Exactly this but should happen. These deposits must then be processed in a different way be removed.  

DE 197 14 089 A1 also proposes a filter stage rake, the be mobile rake over several independently controllable Stellan drives can be driven in a movement path different from a circular path is. DE 199 00 817 A1 discloses a filter stage calculation with one of several moveable handlebars, some of which are variable in length Disc pack. However, these two devices require a high con structural and maintenance effort.

The invention is based on the object, a filter stage Chen to conceive that the realization of an angle of attack up to 75 ° possible and operated with low maintenance at the same time with a simple structure can. This task is done with a filter stage calculation according to the generic term of claim 1 by the  Features of the characterizing part of patent claim 1 solved. A practical one Embodiment of the invention is specified in the subclaims.

The advantages achieved by the invention are in particular that Realization of an angle of attack of up to 75 ° the space requirement even at deep Coagulation is significantly lower than with conventional step rakes. Moreover the rake according to the invention creates the possibility of a complete and space-saving encapsulation as a prerequisite for heat, sound and Odor isolation and possibly the installation of a heater in the event that the Step rakes should be installed in open terrain, which in turn increases the There is no need to build a computer building.

Due to changes in the area of the floor level of the filter level calculation, the Use of an inlet brush and a spring-mounted cover. Sand deposits are still avoided. Likewise, there is no sole jump in the Channel floor and no attachment of the filter stage rake on the channel bottom or the -sidewalls required, causing the swing out to maintenance and Repairs from the channel are given.

An embodiment of the invention is explained with reference to the figures. Show it:

Fig. 1 a filter stage rake in side view.

Fig. 2 A lamella of the fixed grating.

Fig. 3 A lamella of the movable grating.

Fig. 4 The bottom area of the movable grate using a lamella with a movable intermediate element and the base part of the filter stage calculation.

The filter stage rake shown is used to collect and dispense solid components from flowing liquids in the sewage channels of municipal or industrial sewage treatment plants. A rake 1 , 2 is integrated into a frame and consists of a fixed and a movable grating 1 and 2 . The two gratings 1 and 2 are each made up of a number of lamellae 10 and 11 , the fixed and movable lamellae 10 and 11 being spaced apart from one another and arranged in an alternating sequence after the rake 1 , 2 has been installed . The distance between the fins 10 and 11 shows the minimum size of the solids to be filtered. The lamellae 10 and 11 have a stepped shape on their surfaces 3 facing the liquid flow. The movable grating 2 is held by connecting rods 6 so that it has substantially the same inclination as the fixed grating 1st The connecting rods 6 are hinged to eccentric discs 5 , for example, which are moved by a common drive 4 . In addition to these eccentric discs 5 5 receiving waves is incorporated a cam (movement path formative transfer member 7) at either of the eccentric discs. The cam disc is connected via two articulated pivot shafts 8 to a support structure serving as a suspension 9 , via which the connecting rods 6 also transmit their path of motion, which is taken up by the eccentric discs 5 , to the movable grating 2 . Through the cam, the path of motion generated as a closed circular path by the eccentric discs 5 is superimposed in such a way that the horizontal is reduced relative to the vertical deflection, so that the path of motion has an approximately oval shape when transferred to the movable grating 2 . In order to achieve such a superimposition of the cam track, the fixed connection between the connecting rods usually present in such step rakes must be removed beforehand. The movable grating 2 is guided upwards during the execution of the first half of the movement path modified by the cam disc, until the horizontal part of the steps of the movable slats 11 is above the level of the steps of the slats 10 of the fixed grating 1 .

During the execution of the second half of the movement path, the movable grating 2 is guided downwards until it is located with the horizontal part of its steps below the step level of the fixed grating 1 . With each completed movement cycle, the solid constituents are thus removed from the flowing liquid and conveyed upwards by the rake 1 , 2 step by step and released from the uppermost step to collection containers provided or for further processing.

In another application, not shown, all the eccentric discs 5 are replaced by transmission links 7 (cam disks) which shape the movement path, so that the movement path transmitted to the connecting rods 6 and thus to the movable grating 2 corresponds to the curve predetermined by the cam discs.

In Fig. 4 the bottom of the step portion Filterstufenrechens is illustrated. It can be seen that the filter stage rake ends with a base part 12 seated on the bottom of the channel. This base part 12 has on 13 , which carry a shaft 14 extending over the entire width of the rake 1 , 2 . On this shaft 14 intermediate elements 16 are articulated, which perform a linear pivoting movement, which is initiated in that the intermediate elements 16 are held loosely by guides 15 integrated on the floor steps of the movable slats 11 and thus participate in their movement. The guides 15 can z. For example, be the one hand, as shown as guide plates, which enclose the intermediate elements 16 leader, and the other part as pins, which correspond with the elongated holes, which are incorporated in this application is not shown in the intermediate elements 16 are formed. These intermediate elements 16 prevent the gap width between the fixed lamellae 10 from widening in the area of their base steps when the rising movement component of the movable grating 2 is carried out . Due to the linear pivoting movement of the intermediate elements 16 and the flat nose-like projections 17 and 18 on the floor steps of the fixed and movable slats 10 and 11 , the full throughput of the rake 1 , 2 is also retained in the area of the floor step.

In an application, not shown, without the base part 12 seated on the floor, the shaft receiving the intermediate elements 16 can be held on the floor steps of the fixed lamella 11 by means of vertically downward shaping.

List of the reference numerals used

1

fixed grating (rake)

2

movable grating (rake)

3

stepped surface

4

Drive (drive unit)

5

Eccentric disc (drive unit)

6

Connecting rod (drive unit)

7

transmission link (cam disc)

8th

pivot shaft

9

Suspension (support structure)

10

fixed slat

11

movable slat

12

base

13

admission

14

wave

15

guide

16

intermediate element

17

nose-like formation

18

nose-like formation

Claims (6)

1.Filter stage rake for collecting and dispensing solid constituents from flowing liquids, in particular waste water, with a rake which is accommodated in a frame and consists of fixed and movable lamellae, the surfaces of which face the liquid flow and are arranged in steps and spaced from one another and alternately assigned to a grating, the Grating consisting of movable slats is suspended by means of a drive unit, executing a closed movement path, and at least one transmission link-shaping transmission element is interposed in the drive unit between the drive and suspension of the movable grating, characterized in that the transmission path-shaping transmission element ( 7 ) is designed as a cam. 2. Filter stage rake according to claim 1, characterized in that with an eccentric articulation of the movable grating ( 2 ) to the drive unit ( 4 , 5 , 6 , 9 ) additionally a cam disc ( 7 ) which the circular path generated by the eccentric articulation superimposed, interposed. 3. Filter stage rake according to claim 1 or 2, characterized in that a cam is provided on a shaft of the drive unit, which is connected via articulated pivot shafts ( 8 ) to the movable grating ( 2 ) and the movement path of the eccentric discs ( 5 ) movable grille ( 2 ) superimposed. 4. Filter stage rake according to one of claims 1 to 3, characterized in that movably mounted intermediate elements ( 16 ) are integrated in the area of the floor stages of the rake ( 1 , 2 ). 5. filter stage rake according to claim 4, characterized in that the intermediate elements ( 16 ) on the one hand by a shaft ( 14 ) either on the fixed lamellae ( 10 ) of the grate ( 1 ) or on a base part that closes the filter stage rake on the channel floor ( 12 ) are articulated and, on the other hand, by means of guides ( 15 ) on the movable slats ( 11 ) of the grating ( 2 ), held loosely and participating in their trajectories, each perform a linear pivoting movement. 6. Filter step rake according to one of claims 1 to 5, characterized in that the bottom steps of the fixed and movable slats ( 10 , 11 ) have nose-like flat formations ( 17 , 18 ).