DE8627602U1 - Rakes for water channels - Google Patents

Description

PATENT ATTORNEY ICALDENKIRCHENER STRASSE 35a

D^4Ö5Ö MÖNCHENGLADBACH 1 TEL. Ö 2161/12114 ■ TELEX 852 873

ElIPL-ING. M.

EUROPEAN PATENTATTDRMEYi

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Böken & Korzonek Mechanical Engineering Company Ltd.
An der Beek 255, 40S5 Niederkrüchten

Rakes for water channels

The invention relates to a rake for water channels with bars that are arranged in a fixed position in a water channel from the bottom to above the water level and are arranged essentially vertically, and a rake-like cleaning device with tines that reach through the bars from the cleaning side, are arranged essentially transversely to the bars and are intended to receive material that is brought in by the flowing water and is arranged in front of the bars, which tines are arranged so that they can be raised together in the direction of the bars up to above the bars.

Such rakes are particularly used in sewage canals, e.g. in the inlets to sewage treatment plants, and are used to remove solids, which are subsequently referred to as "materials", from the incoming water. For this purpose, the rake-like cleaning device is designed in such a way that it is moved from the so-called "clean side", i.e. the side of the bars facing away from the incoming water, outside the bars to the lower end of the bars, i.e. to the bottom of the water channel. The tines are then moved through the bars against the flow direction of the incoming water so that they grasp the material that has accumulated in front of the bars. The cleaning device is then raised in this position so that the material resting on the tines is transported upwards in front of the bars and along the bars, to outside the water level and beyond the upper end of the bars.

From there, further transport takes place, for example by a pusher device onto a conveyor belt, a container, or the like. This cleaning process is repeated either at predetermined time intervals or depending on signals from measuring devices, by means of which the accumulation of material in front of the bars can be measured.

When the material is being lifted, the force of the flowing water presses the material resting on the tines against the bars. This means that when the material is lifted over the top of the bars, it can fall over the ends of the tines into the cleaning area. This is a disadvantage, because it is precisely this area that the material should be kept away from. Another disadvantage of the known rakes is that when the material has tipped onto the tines in the direction of water flow, the scraping devices only partially capture it and thus part of the material remains on the tines of the cleaning device. When the cleaning device is subsequently immersed, this remaining material is washed off the tines on the cleaning side and has thus passed through the rake in an undesirable way.

The invention is based on the object of improving rakes of the type mentioned at the beginning so that material lifted above the bars can reach the clean side.

■To solve this problem, the invention provides that the bars have deflection devices in the upper area. These deflection devices act in such a way that the material pressed against the bars by the incoming water is pushed forward on the tines against the direction of water flow, thus preventing

is such that a steeply rising edge is formed on the area of the lifted material facing the clean side, which, if the material is lifted so that the edges come out of contact with the bars, tends to "fall over" as a result of its "pre-tension". The deflection device ensures that a gently sloping flank is formed instead of a steeply rising edge.

In a practical embodiment of the invention, it can be provided that the deflection devices are designed as wedge-shaped attachments of the bars. These wedge-shaped attachments can, for example, be designed as one piece with the bars, or it can also be provided that the wedge-shaped attachments are screwed on, welded on, or the like.

According to a further feature of the invention, the bars can be provided with tapered ramps in their lower end areas against the direction of flow. This ensures that the material being fed in is lifted from the bottom of the channel. The tines of the cleaning device, which push into the material accumulating in front of the bars if no ramps are provided, move under the material in the design according to the invention and lift it up. This prevents the material from being swirled around on the tines when it is picked up, which could cause a proportion of small parts to flow through the gaps between the bars. This measure also prevents solids from being pushed forward from the front sides of the tines against the direction of flow and thus not being picked up.

The invention is explained in more detail below with reference to the drawing.

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Fig. 1 is a schematic side view of a rake bar and a cleaning device;

Fig. 2 is a view corresponding to Fig. 1, in which the cleaning device (tines) is shown in material receiving position;

Fig. 3 is a representation corresponding to Fig. 1, in which the cleaning device with the accepted material has moved beyond the bars.

A water channel, for example a sewer, is designated as a whole with 1. The bottom of the sewer has the reference number 2, and the water level of the water carried in the ■channel has the reference number 3. The direction of flow is designated with A.

A rake to be arranged in such a water channel has essentially vertical and stationary bars, one of which is shown and designated 4. In a known manner, a large number of such bars are provided transversely to the flow direction A, between which gaps are formed through which the water

can flow through, and through the effect of which solids (material) with dimensions larger than the width of the gaps are prevented from flowing through. This material, which is designated 5, collects in front of the bars 4, preferably in the lower area.

Furthermore, a cleaning device, designated 6 in total and shown schematically, is provided,

which serves to remove the accumulated material 5. \\ The cleaning device 6 moves from the position 6' shown in dashed lines in Fig. 1 downwards in the direction of arrow B on the cleaning side and is then moved in the direction of arrow G against

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the flow direction A and thereby grips with tines

7 through the gaps between the bars and reaches the position shown in Fig. 2. As can be seen, the tines 7 grasp the material 5 in this position. The cleaning device with the tines 7 in this position is then moved upwards in the direction of arrow D, whereby the material 5 resting on the tines 7 is transported upwards.

According to the invention, it is now provided that the bars 4 have deflection devices 8 in their upper region, which in the embodiment shown are designed as wedge-shaped projections 9. This ensures that the material 5 is pressed against the direction A before passing the upper end of the bars 4, so that a falling flank 10 is formed. If the deflection device

8 is not present, then instead of the sloping flank 10, a practically vertically rising edge would remain, which would tip in direction A as a result of the pre-tension generated by the flow pressure of the water and would fall over the rear edge of the tines 7 and reach the cleaning area or would remain on the tines. In the latter case, when the cleaning device is immersed from position 6 ¹ (Fig. 1), this material on the cleaning side would be washed away in an undesirable manner.

The disadvantages described do not occur with the device according to the invention. The material 5 is transported from the position shown in Fig. 3 by a stripping device (not shown) onto a conveyor belt arranged, for example, across the rake or into a container, without there being any risk that parts of the material will reach the clean side.

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The rods 4 have ramps 11 tapered in their lower end areas against the flow direction A. As can be seen from Fig. 1 and Fig. 2, this ensures that the tines 7 can safely grasp and lift the material 5.

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Claims (3)

PATENT ATTORNEY _.. KALDENKIRCHENER STRASSE 35 a DIPL-ING.M.BONStMifim ': j J.'."!:". 0-405OMONCHENGIADBACHi ^ EUROPEAN PATENTATTd)RNeY .!.*··" ■.·"'··' TEL, 02161/12114 · TELEX 852 873 File: 86 217 Böken & Korzonek Mechanical Engineering Company Ltd.
An der Beek 255, 4055 Niederkrüchten Rakes for water channels Protection claims 1. Rake for water channels with bars that are fixed in a water channel and extend from the bottom to above the water level, essentially vertically arranged and a cleaning device designed like a rake with tines that reach through the bars from the clean side, arranged essentially transversely to the bars and provided for receiving material in front of the bars that is brought in by the incoming water and for lifting the material up to above the bars, which are arranged in the direction of the bars so that they can be lifted together up to above the bars, characterized in that the bars (4) have deflection devices (8) in the upper area that push the material (5) pressed against the bars (4) by the incoming water onto the tines (7) against the direction of water flow (A). 2. Rake according to claim 1, characterized in that the deflection devices (8) are designed as wedge-shaped projections (9) of the bars (4). ·< 11 K IiIII Il
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II ·!· II IM ■ B BIB 3. Rake according to claim 1 or 2, characterized in that the bars (4) have tapered ramps (11) in their lower end regions against the flow direction (A).