DE8807825U1 - Screen drum - Google Patents

Description

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"Screen drum"

The invention relates to a device for screening compost material containing other contaminants with a rotating screening drum.

As environmental awareness increases, more and more emphasis is being placed on recycling, and this also applies to compost material, e.g. cemetery waste. This type of waste often contains materials that cannot be composted, such as metal wires and plastics.

It is known to process such materials after the rest periods necessary for composting by feeding them into sieve drums that are equipped with cylindrical sieve plates in which the sieve holes are made. Screw conveyors are provided inside that transport the material from the feed side to the discharge side, and the compost material that passes through the drum is removed separately. However, since such material is usually moist, there is a risk that the sieve holes will become clogged relatively quickly, and even brushes provided to keep the sieve holes clean are often not enough to prevent them from becoming clogged.

The object of the invention is to create a solution with which 3

the screening performance can be increased by avoiding clogging of the screens as much as possible and in the long term

becomes. \

With a device of the type described above,
This object is achieved according to the invention in that the
Screen drum has a cross-sectional shape that deviates from the circular shape.

This solution ensures that the material to be screened is unevenly applied to the screen surfaces, it is partially
Inside the screen drum is conveyed upwards and then falls
through the interior of the sieve drum downwards in an irregular manner, which means that any clogged 5 sieve holes are released again by the impact of the sieved material .

* be made. \,

In an embodiment, the invention provides that the cross-section of the screening drum is formed by a rectangular polygonal
It is precisely by providing corners in the
The sieve surface of the sieve drum facilitates the upward conveyance of the material to be sieved and thus also the falling down of the material to be sieved after a certain lifting height has been reached.

It is advantageous if the cross section of the screening drum 'i

is formed by an equilateral polyeek. Therefore |

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It is possible to make the screening surfaces essentially the same, which in particular leads to a cost-effective construction of the device.

This aim is also served by a further embodiment of the invention, which consists in that the sieve surfaces of the sieve drum are formed by angular sieve fields _, whereby it can be provided in particular that the sieve fields are equipped with sieve grids.

These sieve grids have the additional advantage that they counteract unnecessary clogging; they can also oscillate independently to a certain extent if heavier parts fall onto them, which results in the sieve surface being cleared.

In order to achieve a certain conveying movement in the axial direction of the screening drum, the invention also provides for straight conveyor webs, inclined at an angle to the axis of rotation, to be arranged on the inner surface of the screening fields.

Further advantages, details and features of the invention will become apparent from the following description and from the drawing, which shows in

Fig. 1 is a side view of a device in a simplified representation and in

Fig. 2 is a plan view according to arrow II in Fig. 1.

t>The device shown in the example, generally designated 1, consists essentially of a fine stand 2 with a screen drum 4 that can rotate about a rotation axis 3.

In the example shown, the screening drum 4 has a hexagonal cross-section with six rectangular screening surfaces, generally designated 5. The rectangular screening surfaces 5 are designed as screening fields with a surrounding frame 6, which is stretched between the screening grids 7.

On the inner surface, at least some of the screening surfaces 5 have angled angle irons 8 which form conveyor webs in order to convey the material axially through the screening drum 4 in the desired direction.

In the example shown, a fine hand crank 9 is shown as the drive, which can of course be replaced by a motor. The other modifications to the device 1, such as a collecting tray for the screening material and the coarse particles that have been screened out, are not shown in more detail in the figure.

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shown.

Of course, the described embodiment of the invention can be modified in many ways without abandoning the basic idea. Depending on the size of the drum, a change can be made between sieve plates and sieve grids within a sieve field, instead of the hexagonal shape shown, another polygonal cross-sectional shape can be selected, and so on.

Claims (6)

r a « · PATENT ATTORNEYS MEINKE AND DABRINGHAUS APPROVED BY THE EUROPEAN PATENT OFFICE · EUROPEAN PATENT ATTORNEY · EUROPEAN PATENT ATTORNEY DIPL-ING. J. MBNKE DIPL-ING. W. DABRINGHAUS 46OODORTMUND 1, 15 June WESTENHELLWEG 67 D/F TELEPHONE (0231)145071 TELEGRAM DOPAT Dortmund TFIFX 8227328 pat d FAX (0231)147670 FILE NO: 1/6660 Applicant: Wekompa GmbH, Änne-Frank-Ring 8, 4714 SeIm Expectations: 1. Device for screening compost material containing other contaminants using a rotating screening drum, characterized, that the screening drum (4) has a shape deviating from the circular cross-sectional shape. 2. Device according to claim i, characterized in that the cross-section of the screening drum (4) is formed by a polygonal polygon. 3. Device according to claim 1 or 2, characterized in that the cross-section of the screening drum (4) is of equal B I !»111 ■· ■· «· r ■ sided polygon. 4. Device according to one of the preceding claims, characterized in that the side surfaces (5) of the sieve drum (4) are formed by angular sieve fields. 5. Device according to claim 4, characterized in that the sieve fields (5) are equipped with sieve grids (7). 6. Device according to one of the preceding claims, characterized in that straight conveyor webs (8) inclined at an angle to the axis of rotation (3) are arranged on the inner surface of the sieve fields (5).