Sieve star with cleaning element

Abstract

Sieve star for a sieving device for sieving a material such as municipal waste, wood chips or soil-covered crops, comprising the sieve star: 1.1 a hub (4) that defines an axis of rotation (R) of the sieve star (3), 1.2 Several elastically compliant fingers (5) made of plastic or rubber are distributed around the axis of rotation (R), projecting from a foot area (6) near the hub (4) to a free peripheral end (7), with at least one of the fingers (5) serving as a cleaning finger (5), and 1.3 a cleaning element (10; 20; 30; 40; 50) detachably attached to the cleaning finger (5) made of a material that is harder than the plastic or rubber of the fingers (5), wherein 1.4 the cleaning element (10; 20; 30; 40; 50) can be optionally attached to the cleaning finger (5) in a first and a second orientation, 1.5 the cleaning element (10; 20; 30; 40; 50) has a first cleaning geometry (11; 21; 31; 41; 51) and a second cleaning geometry (12; 22; 32; 42; 52), 1.6 In the first orientation, the first cleaning geometry (11; 21; 31; 41; 51) and in the second orientation, the second cleaning geometry (12; 22; 32; 42; 52) take an active position, while the other cleaning geometry takes a passive position. 1.7 the cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51, 52) in the active position points in the direction of rotation (D) of the sieve star (3) and / or radially outwards, and 1.8 the cleaning geometry of the hub (4) in the passive position is radially closer than the cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51, 52) in the active position and / or points against the direction of rotation (D) of the sieve star (3).

Description

[0001] The invention relates to a star-shaped sieve for a sieving device for sieving material. The sieving device is a so-called star sieve with rotatable star-shaped sieves that interlock like a comb. The material to be sieved can be bulk materials, in particular mixtures containing soil, such as soil-covered crops and / or soil-covered stone material, compost, wood chips, or, for example, construction debris, household waste, or other municipal waste. The star-shaped sieve is equipped with a cleaning element. The invention also relates to the cleaning element itself and to a sieving device with one or more star-shaped sieves, each with a cleaning element.

[0002] A star screen with a cleaning element is known from EP 1 088 599 B1. The star screen has several elastically compliant fingers distributed around an axis of rotation. One of the fingers serves as a cleaning finger. A cleaning element made of a resistant material is attached to the cleaning finger. This element serves to remove adhering material from the gap between two opposing star screens. The cleaning element extends from a base region of the star screen over the entire length of the cleaning finger and projects a short distance beyond a peripheral end of the cleaning finger. The radially inner end of the cleaning element projects into a bore provided in the base region of the star screen and is fastened to the peripheral end region of the cleaning finger by means of a rivet. The cleaning element has proven its effectiveness in use over many years.

[0003] Cleaning elements attached to screen stars are subject to considerable wear. Replacing them incurs costs, especially since screening devices typically have several screen star shafts arranged side by side, each with multiple screen stars, and a large number of these screen stars, often all of the device's screen stars, are equipped with cleaning elements.

[0004] One object of the invention is to reduce the costs of cleaning sieve devices by means of cleaning elements attached to the sieve stars.

[0005] Another task is to extend the service life of a cleaning element.

[0006] The invention relates to a sieve star for a sieving device for sieving material such as municipal solid waste, wood chips, or soil-covered crops. The sieve star comprises a hub that defines an axis of rotation, and several fingers distributed around the axis of rotation, each projecting from a base near the hub to a free peripheral end. The fingers are elastically compliant. The fingers, or the sieve star as a whole, can be made of an elastomeric plastic or, for example, of rubber, in particular an elastomeric composite material or a rubber composite material. The fingers can project straight from the axis of rotation in a star shape. Preferably, however, they are crescent-shaped, with the peripheral end of each finger advantageously trailing the base of the finger with respect to the direction of rotation.

[0007] At least one of the fingers serves as a cleaning finger. For this purpose, the sieve star includes a cleaning element detachably attached to the cleaning finger, made of a material harder than the finger material. The arrangement of the cleaning element designates the respective finger as a cleaning finger. Apart from the cleaning element and one or more features required for its attachment, this finger can be identical to the other fingers of the sieve star. Alternatively, the cleaning finger itself, i.e., before the cleaning element is mounted, can differ from the other fingers of the sieve star, for example, by having one or more openings, such as one or more bores, for a specific attachment element and / or a shaped seat for the cleaning element.The sieve star can also include two or more cleaning fingers, each with a cleaning element, whereby the multiple cleaning fingers, including the cleaning element, can be the same or different from each other.

[0008] According to the invention, the cleaning element is designed to be selectively attached to the cleaning finger in a first and a second orientation. For this purpose, it has a first cleaning geometry and at least one further, second cleaning geometry. In the first orientation, the first cleaning geometry assumes an active position and the second cleaning geometry assumes a passive position. In the second orientation, the second cleaning geometry assumes an active position, while the first cleaning geometry is in a passive position.

[0009] The cleaning geometry in the active position points outwards in the direction of rotation of the sieve star and / or radially. The cleaning geometry in the active position is subsequently referred to simply as the "active cleaning geometry".

[0010] The cleaning geometry in the passive position is radially closer to the hub of the sieve star than the active cleaning geometry, or it points against the direction of rotation of the sieve star. It can also point against the direction of rotation of the sieve star and simultaneously be radially closer to the hub than the active cleaning geometry.

[0011] The active cleaning geometry advantageously extends to at least a virtual circumcircle of the sieve star that touches the peripheral end of the cleaning finger. The center of the circumcircle is the axis of rotation of the sieve star. The cleaning element, with its active cleaning geometry, preferably projects beyond this circumcircle. The circumcircle can, in particular, be a circle that touches the cleaning finger at its peripheral end when the sieve star is unloaded and surrounds the peripheral ends of all fingers of the sieve star, whereby not all other fingers of the sieve star need to abut the circumcircle; i.e., the fingers do not necessarily have to project the same distance radially outward from the axis of rotation.

[0012] The peripheral end of the cleaning finger can be straight parallel to the axis of rotation, or alternatively, convexly curved radially outwards (round, polygonal, or concave). If the cleaning finger is viewed axially from one end face to the other in sections perpendicular to the axis of rotation, and the circumscribed circle that touches the cleaning finger at its peripheral end is formed in each section, the active cleaning geometry preferably projects over at least the majority of its width (measured parallel to the axis of rotation) to at least the circumscribed circle of the respective section. It is advantageous if the active cleaning geometry projects radially beyond the circumscribed circle of the respective section over the majority of its width, preferably over its entire width.If the sieve star is part of a sieve device with comb-like interlocking sieve stars, the cleaning geometry that is actually active in operation thus engages deeper than the elastic material of the sieve star over the majority of its width into an opposite gap between two sieve stars of the sieve device.

[0013] The cleaning geometries can advantageously be adapted to the contour of the peripheral end of the cleaning finger in the axial direction. The cleaning geometry in the active position can follow the contour of the peripheral end. Preferably, it follows the contour of the peripheral end of the cleaning finger at a distance that is at least substantially constant, with the distance being measured in the axial direction at the intersection perpendicular to the axis of rotation between the cleaning geometry and the peripheral end of the cleaning finger.

[0014] The cleaning element is advantageously shaped such that, after the fastening is released, it can be rotated about an axis inherent to the body and then reattached from its first orientation to its second, and reattached in the second orientation. The first cleaning geometry, the second cleaning geometry, and any additional optional cleaning geometry can be shaped and positioned on the cleaning element such that they can replace each other equivalently in their respective active positions. They can be identical in shape and size. Advantageously, the cleaning element is point-symmetric and / or axis-symmetric with respect to the first and second cleaning geometries and any additional optional cleaning geometry. In particular, the cleaning element can have n-fold rotational symmetry, where n is a natural number and n ≥ 2.It is particularly preferred that the element exhibits double rotational symmetry with only the first and second cleaning geometries, i.e., n = 2. However, perfect geometric symmetry is not required. What is essential is that the cleaning geometries are functionally equivalent to one another. In this sense, the cleaning element has n-fold equivalence of the positions discretely defined by the cleaning geometries.

[0015] The cleaning element has a front and a back side, which face away from each other in the vertical direction of the cleaning element. The back side faces a leading edge of the cleaning finger in the direction of rotation. The front side faces away from the cleaning finger in the direction of rotation. When the cleaning element is mounted in the first orientation, the first cleaning geometry extends along the front side to a radially outer, first end of the cleaning element. Preferably, it forms an outer circumferential edge of the cleaning element. The second cleaning geometry extends along the front side to a radially inner, second end of the cleaning element or along the back side of the cleaning element. Preferably, it forms an outer circumferential edge of the cleaning element at either the first or the second end.

[0016] If the cleaning element is attached to the sieve star in the first orientation, its back side faces the cleaning finger in the vertical direction and can, for example, rest directly against the cleaning finger. When the second cleaning geometry is formed on the front side, the cleaning element can be transformed from the first orientation to the second orientation by rotating it about a vertical axis extending in the vertical direction. When the second cleaning geometry is formed on the back side, the cleaning element can be transformed from the first orientation to the second orientation by rotating it about a transverse axis parallel to the axis of rotation or, more preferably, about a longitudinal axis orthogonal to both the vertical and transverse axes.

[0017] The vertical direction, and thus the vertical axis, of the cleaning element advantageously points at least substantially perpendicular to a leading face of the cleaning finger that advances in the direction of rotation of the sieve star. It can, for example, extend at least substantially parallel to the local direction of rotation at the location of the active cleaning geometry. Any deviation from parallelism, i.e., an angle of inclination to the local direction of rotation, is preferably less than 45°. The local direction of rotation can be represented by a tangent to a virtual circumcircle of the sieve star, with the tangent touching the first end of the cleaning element.

[0018] The cleaning element can be detachably attached directly to the cleaning finger, so that it rests directly against the cleaning finger when attached. Alternatively, it can be attached indirectly to the cleaning finger, but detachably for the purpose of swapping the positions of the cleaning geometries. The indirectly attached cleaning element can be attached to a holding structure, and this can be attached directly or, if necessary, indirectly to the cleaning finger. Preferably, the cleaning element is detachably attached to the holding structure, so that swapping the positions of the cleaning geometries does not require loosening the holding structure, but rather the position swap can be carried out with the holding structure attached by loosening and reattaching the cleaning element to the holding structure.

[0019] In initial designs, the first and second cleaning geometries are each formed on the front of the cleaning element. In both orientations, the cleaning element faces the cleaning finger with the same back side pointing upwards. In particular, its back side can rest directly against the cleaning finger. The cleaning element can be rotated from one orientation to the other by rotating it around its vertical axis. To do this, the attachment of the cleaning element in the first orientation is released, the cleaning element is rotated around its vertical axis, and then reattached in the second orientation.If the fastening can be released non-destructively, as with a threaded bolt and nut, the fastening can be designed so that it only needs to be loosened to rotate the cleaning element on the cleaning finger around its vertical axis into the second orientation. The longitudinal axis of a fastening element, such as the longitudinal axis of a screw bolt or pin, can form the vertical axis of the cleaning element.

[0020] In the second embodiment, the first cleaning geometry is formed on the front side facing away from the cleaning finger, and the second cleaning geometry is formed on the back side of the cleaning element facing the cleaning finger, when the cleaning element is mounted in the first orientation. In the first orientation, the back of the cleaning element faces away from the cleaning finger, and in the second orientation, the front side faces away from the vertical direction. Specifically, in the first orientation, the back of the cleaning element can be in direct contact with the cleaning finger, and in the second orientation, the front side can be in direct contact with the cleaning finger. In the second embodiment, the cleaning element can be rotated from one orientation to the other by rotating it about a longitudinal axis orthogonal to the vertical direction and / or about a transverse axis parallel to the axis of rotation of the sieve star.For this purpose, the fastening of the cleaning element in the first orientation is loosened, the cleaning element is rotated around the longitudinal or transverse axis and reattached in the second orientation.

[0021] The cleaning element can have a third cleaning geometry on its front side and can optionally be attached to the cleaning finger in a third orientation. In the third orientation, the third cleaning geometry assumes the active position, while both the first and second cleaning geometries assume a passive position. The cleaning element can be moved from the first to the third orientation by rotating it around its vertical axis.

[0022] In such embodiments with more than two cleaning geometries, the second cleaning geometry can be formed on the rear side of the cleaning element, and the cleaning element can be moved from the second orientation to the third orientation by rotating it about its longitudinal or transverse axis. In preferred modifications, the second cleaning geometry can also be formed on the front side, so that the cleaning element can be moved from the first and also from the second orientation to the third orientation by rotating it about its vertical axis.

[0023] As already mentioned, a holding structure for several cleaning elements can be attached to the cleaning finger, at least one of which is designed according to the invention. The cleaning elements arranged on the common holding structure can advantageously each be designed according to the invention. In particular, the cleaning elements can be identical and thus interchangeable with each other on a 1:1 basis. The several cleaning elements can be detachably attached side by side in a transverse direction parallel to the axis of rotation in the first orientation on the holding structure, so that together they form a cleaning geometry composed of the first cleaning geometries of the individual cleaning elements. In the case of a transition to the second orientation, they together form a cleaning geometry composed of the second cleaning geometries of the individual cleaning elements.If the degree of wear of the first cleaning geometries differs, it is not necessary to realign all cleaning elements at the same time; rather, the realignment can be carried out depending on the degree of wear of the active cleaning geometry of the respective cleaning element.

[0024] The first cleaning geometry, the second cleaning geometry, and, if present, the third cleaning geometry can be geometrically identical, i.e., in shape and size. In any case, the cleaning geometries are identical to the extent that they can replace each other with respect to the cleaning function.

[0025] The invention relates not only to the sieve star with mounted cleaning element, but also to a sieve assembly comprising the sieve star and further sieve stars of this type. The sieve assembly includes several sieve stars rotatably arranged about a common first axis of rotation and each having several fingers distributed around the first axis of rotation, each projecting from a base region of the respective sieve star to a free peripheral end away from the first axis of rotation. Furthermore, the sieve assembly includes several additional sieve stars rotatably arranged about a common second axis of rotation and each having several fingers distributed around the second axis of rotation, each projecting from a base region of the respective sieve star to a free peripheral end away from the second axis of rotation. The sieve stars rotatable about the first axis of rotation and the sieve stars rotatable about the second axis of rotation interlock in a combing manner.One or preferably several of the sieve stars is or are each a sieve star according to the invention. The sieving device preferably comprises one or more further arrangements of sieve stars, wherein each sieve star arrangement is rotatably arranged about a common further axis of rotation and the sieve stars of the respective adjacent sieve star arrangements interlock in a combing manner. One or preferably several of the sieve stars of each further sieve star arrangement can be a sieve star according to the invention.

[0026] The sieve stars, rotatably arranged about a common axis of rotation, can be mounted on a rotatably supported shaft that extends centrally through the sieve stars. The shaft can have a non-circular outer circumference, and each sieve star can have a correspondingly non-circular inner circumference, so that rotational movements of the shaft are transmitted to the sieve stars in the area of ​​engagement between the outer and inner circumferences. "Non-circular" means that the shaft and the opening of the respective sieve star are not simply circular in the overlap. Preferably, the outer circumference of the shaft and the inner circumference of the respective opening have at least one or more flat surfaces in the area of ​​engagement.The adjacent sieve stars can be directly or indirectly connected to each other around the first axis of rotation via at least one intermediate piece, a coupling structure, so that a torque can be transmitted in the engagement of the shaft with the respective sieve star and also in the engagement of the sieve stars directly among themselves or in engagement with the coupling structures. The sieving device comprises two or more such shafts, each with several sieve stars arranged side by side along the respective shaft, wherein the sieve stars of one shaft engage in gaps between the sieve stars of the neighboring shaft(s), so that an overall comb-like engagement is present.

[0027] The invention also relates to a cleaning element as such. In particular, this cleaning element can form the cleaning element attached to the cleaning finger. The cleaning element according to the invention comprises: - a front and a back, facing away from each other in a vertical direction of the cleaning element, - a first end and a second end, spaced apart from each other in a longitudinal direction of the cleaning element, - a first cleaning geometry at the front at the first end of the cleaning element, - a second cleaning geometry on the back and / or at the second end of the cleaning element, and - a base with a first passage and optionally a second passage, wherein the respective passage extends from the front to the back through the cleaning element, so that a fastening element can be guided through the respective passage to attach the cleaning element to a cleaning finger of a sieve star.

[0028] "At the first end" and "at the second end" mean that the respective cleaning geometry extends along a circumferential edge or in close proximity to the circumferential edge of the cleaning element at the respective end. If the cleaning element has a straight or curved circumferential edge at the first end and / or the second end, the respective cleaning geometry expediently extends in a straight line or curve, following the contour of the circumferential edge. In particular, the respective cleaning geometry can form the outer circumferential edge.

[0029] In advantageous embodiments, the first cleaning geometry is freestanding at the first end on the front face along a circumferential edge section of the cleaning element. The first cleaning geometry can project vertically from the base of the cleaning element, for example, in a web-like or rib-like shape, or ramp-like upwards from the base, and is thus freestanding. The cleaning element can have a greater thickness in the circumferential edge section of the first cleaning geometry than in the adjacent area of ​​the base, with the thickness being measured in the vertical direction. The first cleaning geometry can rise vertically from the base over at least the predominant part of the width of the cleaning element measured orthogonally to the vertical and longitudinal directions, either in steps or continuously and gradually, for example, simply obliquely or concavely or convexly curved.

[0030] The second cleaning geometry can be located on the front or back of the cleaning element. On the back, it can be located in any circumferential edge section of the cleaning element, but particularly along a circumferential edge section at the first end of the cleaning element, so that it faces away from the first cleaning geometry with respect to the vertical direction. If the second cleaning geometry is formed on the front, it can extend, in particular, along a circumferential edge section at the second end of the cleaning element. Alternatively, it can also extend between a circumferential edge section at the first end and a circumferential edge section at the second end of the cleaning element, i.e., along a lateral circumferential edge section.

[0031] The second cleaning geometry can project from the base of the cleaning element at the front in the vertical direction or at the rear against the vertical direction, for example, in a web-like or rib-like shape, or ramp-like upwards from the base, and thus be freestanding. The cleaning element can have a greater thickness in the circumferential edge section of the second cleaning geometry than in the adjacent area of ​​the base, with the thickness being measured in the vertical direction. The second cleaning geometry can rise from the base in or against the vertical direction over at least the predominant part of the width of the cleaning element measured orthogonally to the vertical and longitudinal directions, either in steps or continuously and gradually, for example, simply obliquely or concavely or convexly curved.

[0032] The base of the cleaning element can have a groove-shaped recess on its front surface, which, when viewed from above, extends along the circumferential edge at the first end of the cleaning element at a certain distance, thus exposing the first cleaning geometry on the front surface. By means of a groove formed on the front surface of the cleaning element near the first end, the first cleaning geometry can be exposed along the circumferential edge in the form of a groove boundary wall.

[0033] To expose the second cleaning geometry on the rear side of the cleaning element, the base can have a groove-shaped recess on the rear side that extends, in a top view of the rear side, along the circumferential edge at the second end or, preferably, the circumferential edge at the first end of the cleaning element at a certain distance. The second cleaning geometry can be exposed along the respective circumferential edge by means of a groove formed on the rear side of the cleaning element near the first or second end. Alternatively, the second cleaning geometry can be exposed on the front side of the cleaning element. For this purpose, the base can have a groove-shaped recess on the front side that extends, in a top view of the front side, along the circumferential edge at the second end of the cleaning element at a certain distance.By means of a groove formed on the front of the cleaning element near the second end, the first cleaning geometry in the form of a groove boundary wall along the circumferential edge can be exposed.

[0034] Instead of a groove-shaped recess with a recess base, the respective cleaning geometry can also be created by means of a preferably narrow passage extending vertically through the cleaning element. The cleaning geometry obtained in this way is then not a groove boundary wall, but a passage boundary wall. If all cleaning geometries of the cleaning element are formed by means of a groove-shaped recess and / or by means of a passage, the cleaning element as a whole can advantageously be disc- or plate-shaped.

[0035] The cleaning geometry, which projects upwards on the front side or against the upward direction on the back side, or is otherwise exposed and which may be rib- or rib-shaped, is preferably narrow. Its wall thickness at the free end of the respective cleaning geometry and over an adjoining wall area subject to wear during use is preferably less than 2 mm or less than 1 mm. Preferably, the wall thickness over the majority of the height of the respective cleaning geometry, measured in the upward direction up to the free end, is less than 2 mm or less than 1 mm.

[0036] One advantage of a cleaning geometry that projects in a rib- or rib-like manner, or that rises in a ramp-like manner towards the first or second end in a vertical or counter-vertical direction, or that is otherwise rib-like and freestanding, for example by an adjacent passage, is that the cleaning geometry sharpens itself during use. If the cleaning geometry already has an edge at its free end before use, this edge shifts due to material wear, but essentially remains and can exert a cutting effect on the material that collects in the gap between two sieve stars. If the free end of the freestanding cleaning geometry, pointing upwards, is rounded when new, the material wear occurring during use gradually forms an edge, thereby improving the cleaning effect.

[0037] In initial versions, the cleaning element extends only over a peripheral section of the cleaning finger and has a correspondingly short overall length. This makes the cleaning element compact and allows it to be manufactured with comparatively little material. Furthermore, the effort required for attaching it to the sieve star is minimal.

[0038] In a second variant, where the first cleaning geometry is formed at a radially outer first end of the cleaning element on the front and the second cleaning geometry is formed at the first end on the rear, the cleaning element extends between the cleaning finger and a subsequent finger advancing in the direction of rotation into the base of the sieve star, preferably into the hub, thereby providing additional support on the sieve star. The cleaning element can be moved from the first orientation to the second orientation by rotating it about a longitudinal axis inherent to the body that is orthogonal to the vertical direction.

[0039] In the second variant, the cleaning element can have a shaft that projects longitudinally from the base. The base extends longitudinally from the first end of the cleaning element to the shaft. In a top view of the front, the shaft is preferably narrower than the base. In an advantageous embodiment, the cleaning element is straight in longitudinal section from its first end to a free end of the shaft, and thus along its entire length, without any bends.

[0040] Exemplary embodiments of the invention are explained below with reference to the figures. Features that become apparent in the exemplary embodiments, both individually and in each combination of features, advantageously further define the subject matter of the claims and aspects, as well as the embodiments explained above. The figures show: Fig. 1 a sieve device with sieve stars that interlock like a comb; Fig. 2 the combing action of several of the sieve stars in a top view; Fig. 3 one of the sieve stars in an isometric view onto a cleaning finger with a detachably attached cleaning element of a first embodiment; Fig. 4 the cleaning finger with the cleaning element in a different isometric; Fig. 5 the cleaning element in a top view of a front side; Fig. 6 the cleaning element in an isometric view on the front; Fig. 7 the cleaning element in an isometric view on a back side; Fig. 8 a sieve star in an isometric configuration on a cleaning finger with a detachably attached cleaning element of a second embodiment; Fig. 9 the cleaning element of the second embodiment in an isometric view onto a front side; Fig. 10 a sieve star in an isometric view on a cleaning finger with a detachably attached cleaning element of a third embodiment; Fig. 11 the sieve star of the third embodiment in a different isometric view; Fig. 12 the cleaning element of the third embodiment in a side view; Fig. 13 the cleaning element of the third embodiment in an isometric view on a front side; Fig. 14 a sieve star in an isometric view on a cleaning finger with a detachably attached cleaning element of a fourth embodiment; Fig. 15 the cleaning finger with the cleaning element of the fourth embodiment in a side view; Fig. 16 the cleaning element of the fourth embodiment in an isometric view on a front side; Fig. 17 the cleaning element of the fourth embodiment in a side view; Fig. 18 an arrangement of cleaning elements of a fifth embodiment in an isometric view on a front side; Fig. 19 the arrangement of the cleaning elements of the fifth embodiment in an isometric view on a reverse side; Fig. 20 a modified arrangement of cleaning elements of the fifth embodiment in an isometric view of the front; and Fig. 21 one of the cleaning elements of the fourth embodiment in an isometric view of the front.

[0041] Fig. Figure 1 shows a sieve device with a first arrangement of sieve stars 3 arranged side by side along a common first axis of rotation R1, and a second arrangement of sieve stars 3 arranged side by side along a second axis of rotation R2. The axes of rotation R1 and R2 extend side by side at a distance and are at least substantially, preferably exactly, parallel. The sieve stars 3 of the first sieve star arrangement are arranged so that they are not rotatable relative to each other and are rotatable together about the axis of rotation R1. The sieve stars 3 of the second sieve star arrangement are arranged so that they are not rotatable relative to each other and are rotatable together about the axis of rotation R2.

[0042] The sieve stars 3 of the first sieve star arrangement are arranged on a first support 1, which axially penetrates the sieve stars 3 in the region of each sieve star hub 4. The sieve stars 3 of the second sieve star arrangement are arranged on a second support 2, which axially penetrates these sieve stars 3 centrally, in the region of each sieve star hub 4. The support 1 forms a shaft or is part of a shaft by means of which the sieve stars 3 of the first arrangement are rotatably mounted about the common axis of rotation R1 in or on a frame of the sieving device. Likewise, the support 2 forms a shaft or is part of a shaft by means of which the sieve stars 3 of the second arrangement are rotatably mounted about the common axis of rotation R2 in or on the frame of the sieving device.

[0043] The supports 1 and 2 have a non-circular outer circumference; in the exemplary embodiment they are polygonal, in this specific case rectangular profiles. The sieve stars 3 each have a hub 4 with a passage corresponding to the outer circumference of the supports 1 and 2. This passage is adapted to the outer circumference of the respective support 1 and 2 at least to the extent that a rotationally fixed engagement is achieved between the support 1 or 2 and the sieve star hub 4 for the transmission of a torque.

[0044] The first star screen assembly comprises a first star screen 3 and an axially adjacent second star screen 3, as well as further, unspecified star screens. The second star screen assembly comprises a third star screen 3 and a fourth star screen 3, as well as further, unspecified star screens. An axial gap remains between the axially adjacent star screens 3 of the first star screen assembly and between the axially adjacent star screens 3 of the second star screen assembly. The star screens 3 of the first star screen assembly are axially offset with respect to the star screens 3 of the second star screen assembly, such that the star screens 3 of one star screen assembly project into the axial gaps of the other star screen assembly, resulting in a comb-like engagement of the star screen assemblies.

[0045] Fig. Figure 2 shows the combing action of the sieve stars 3 in a top view. When the sieve star assemblies are rotated, the fingers 5 of the sieve stars 3 of one sieve star assembly project successively with their peripheral ends 7 in a radial direction to near the base of the gaps laterally bounded by the sieve stars 3 of the other sieve star assembly. The base of the gap is defined as the free outer circumferential surface between adjacent sieve stars 3 of the respective sieve star assembly, facing radially towards the peripheral end 7 of the respective finger 5. The base of the gap rises towards the sides of the gap in a rounded, arc-shaped manner.

[0046] The fingers 5 of the sieve stars 3 taper continuously radially outwards towards the peripheral ends 7. In the exemplary embodiment, the fingers 5 taper conically. The sieve stars 3 therefore do not lie axially parallel to one another with their side surfaces. When passing through the respective gap, the chamber-like interlocking sieve stars 3 form only a narrow, linear gap with their side surfaces. This counteracts the formation of discs, which can occur particularly with wet material containing soil.

[0047] The sieve stars 3 each have at least one cleaning finger 5 with a cleaning element 10 of a first embodiment. The cleaning elements 10 are made of a material that is harder and more wear-resistant than the material of the fingers 5. The cleaning elements 10 can, in particular, be made of a metal, including a metal alloy. The cleaning elements 10 serve to prevent material from the sieved material from adhering to the base of the sieve star gaps. Each cleaning element 10 acts like a scraper, scraping off adhering material from the base of the gap.

[0048] In the exemplary embodiment, the fingers 5 of the sieve stars 3, arranged along a common axis of rotation, are aligned in the axial direction, as shown in the Fig. 1 and Fig. 2 is recognizable. In one modification, the sieve stars 3 can be offset in their rotational angular positions along their respective axis of rotation about the axis of rotation. For example, every second sieve star 3 can be arranged in a rotational angular position offset circumferentially from its axially adjacent sieve stars 3, so that the fingers 3 of these sieve stars 3 no longer align axially with the fingers 5 of the other sieve stars 3, but are arranged, for example, with a gap in axial view. In such embodiments, the sieve stars 3 differ with respect to the rotational angular position of the inner circumference of the passage 8 relative to the fingers 5. The rotational angular offset can be implemented directly in the elastomer or rubber material of the sieve stars.If the inner circumference of the passage 8 is formed by a metal insert body or a plastic insert body made of a more resistant material than that of the fingers 5, the sieve stars 3 can be identical in shape in the area of ​​the elastomer or rubber material and different insert bodies can be used for the rotary angle attachment.

[0049] Fig. Figure 3 shows one of the sieve stars 3 in an isometric view of a front face of the cleaning finger 5 and the cleaning element 10, also as an example for the other sieve stars 3 of the first embodiment. The sieve stars 3 are similar enough to be interchangeable. Preferably, they are identical with respect to geometry and material. The sieve star 3 has the aforementioned hub 4 with the passage 8 for the carrier 1 or 2. The non-circular, rectangular cross-section of the passage 8 is visible, which ensures that the sieve star 3 is fixed to the carrier.

[0050] The sieve star 3 has several fingers 5 distributed circumferentially around the axis of rotation R. These fingers project radially outwards from a base region 6 of the sieve star 3 to their respective free peripheral ends 7 away from the axis of rotation R. R denotes the individual axis of rotation of the sieve star 3, which, when the sieve star 3 is arranged in a sieving device, coincides with one of the axes of rotation of this sieving device, for example, axis R1 or axis R2. The fingers 5 can be arranged as shown in Fig. 3, recognizable, crescent-shaped projections, with the peripheral end 7 of each finger 5 trailing the foot region 6 of the same finger 5 with respect to the direction of rotation D. The direction of rotation D is indicated by a rotation direction arrow. The foot region 6 of the sieve star 3 can form part of the hub 4 or project radially outwards from the hub 4. In the foot region 6, a base circle extends around the axis of rotation R, connecting the radially deepest points in the gaps between adjacent fingers 5. In the exemplary embodiment, the foot region 6 thus also forms a root or foot region of the fingers 5.

[0051] The fingers 5 are flexible, with the flexural stiffness being adapted to the material being screened. For example, for cleaning soil-covered crops, screen stars 3 are used with fingers that advantageously have a lower flexural stiffness and / or lower hardness than the fingers of screen stars 3 used for screening soil-stone mixtures. The screen star 3 can be made of rubber or an elastomeric material, including a rubber composite material or an elastomeric composite material, particularly in the area of ​​the fingers 5 and preferably also in the base area 6, and optionally also in the area of ​​the hub 4.

[0052] The cleaning element 10 is arranged on the leading front face of the cleaning finger 5 in the direction of rotation D. It has a radially outer, first end and a radially inner, second end and is attached to the cleaning finger 5 between these ends by means of a fastening element 60. The outer first end projects radially outward beyond a virtual circumscribed circle of the sieve star 3. The circumscribed circle is an imaginary circle around the axis of rotation R that touches the peripheral end of the cleaning finger 5. Preferably, all fingers 5 of the sieve star 3 project to a maximum extent to this circumscribed circle, which they may also touch. If the sieve star 3 is part of a sieving device (see...) Fig. 2) The cleaning element 10 extends furthest into the opposite sieve star gap of the sieve device with its first end and picks up material located at the bottom of the gap, essentially scraping it off so that it cannot obstruct the fingers 5 that subsequently dip into the bottom of the gap. The stress on the fingers 5 caused by adhering material, and consequently the drive power required for the rotary drive and the wear of the fingers 5, are reduced.

[0053] Fig. Figure 4 is an isometric view of the back side only of the cleaning finger 5. In conjunction with Fig. Figure 3 shows the attachment of the cleaning element 10 to the cleaning finger 5. The cleaning element 10 is detachably connected to the cleaning finger 5 by means of a rivet connection. A rivet shank 60 extends through the cleaning element 10 and the cleaning finger 5, for example from the front to the back, and is deformed into a rivet head 61 on the back of the cleaning finger 5. The rivet connection clamps the cleaning element 10 against the front of the cleaning finger 5. A washer 62 distributes the clamping force over a larger area on the back of the cleaning finger 5. While a rivet connection is a preferred embodiment of a detachable attachment, the cleaning element 10 can alternatively be clamped to the cleaning finger 5 by means of a screw connection. A screw connection can be loosened without damage and reused for reattachment.

[0054] In Fig. Figure 4 shows the vertical axis H of the cleaning element 10. The vertical direction H points at least substantially in the direction of rotation D when the cleaning element 10 is attached to the cleaning finger 5. The tensile stress required to clamp the cleaning element 10 within the riveted connection or, alternatively, a screw connection, also acts in and against the vertical direction H.

[0055] The cleaning element 10 has a first cleaning geometry 11 at its radially outer or first end, which projects in the direction of rotation D from a front face of the cleaning element 10 pointing in the direction of rotation D, so that when it enters an opposing sieve star gap, it presses against the material located there, especially at the bottom of the gap, and displaces it. The cleaning geometry 11 extends axially over a predominant part of the width of the cleaning element 10. Advantageously, it is edge-shaped at its free end pointing in the direction of rotation D, preferably over its entire length, so that it forms a kind of cutting edge to improve the scraping effect, especially in the area of ​​the gap bottom.

[0056] The cleaning element 10 is designed so that it can continue to be used without impairing its cleaning effect even if the cleaning geometry 11 becomes worn. For this purpose, it has a second cleaning geometry 12 at its radially inner, or second, end in the illustrated arrangement. The second cleaning geometry 12 also projects from the front of the cleaning element 10 in the direction of rotation D. The cleaning geometry 12 extends axially over a predominant part of the width of the cleaning element 10. It can be edge-shaped at its free end pointing in the direction of rotation D, preferably over its entire length, so that it forms a kind of cutting edge.

[0057] The cleaning geometry 12 can replace the cleaning geometry 11. In the exemplary embodiment, the cleaning geometries 11 and 12 are geometrically identical. However, only the first cleaning geometry 11 occupies an active position, while the cleaning geometry 12 occupies a radially inner and therefore passive position. If the cleaning effect of the first cleaning geometry 11 is impaired by wear or even damage, the cleaning geometries 11 and 12 can exchange their positions on the cleaning finger 5. For this purpose, the fastening of the cleaning element 10 is loosened, the cleaning element 10 is rotated about a vertical axis H parallel to the vertical direction H, and the cleaning geometry 12, which is thereby brought into the radially outer, active position, is reattached to the cleaning finger 5.

[0058] The Fig. 5, Fig. 6 and Fig. Figure 7 shows the cleaning element 10 as such, detached from the cleaning finger 5. Fig. Figure 5 is a top view of the front of the cleaning element 10. Fig. Figure 6 shows the cleaning element 10 in an isometric view, also from the front, and Fig. Figure 7 is an isometric view of the back side, showing how the cleaning element 10 rests against the cleaning finger 5 when attached. Fig. 6 is a body-specific, Cartesian coordinate system with the vertical axis H pointing in the vertical direction, which is also labelled H, a transverse axis Q pointing parallel to the axis of rotation R of the sieve star 3 when fixed in place, and a longitudinal direction or longitudinal axis L pointing radially outwards when fixed in place. The origin of the coordinate system is located in a central area of ​​the cleaning element 10.

[0059] The cleaning geometry 11 extends at the first end with respect to the longitudinal direction L and follows the course of the outer circumferential edge of the cleaning element 10 there. The second cleaning geometry 12 extends at the second end opposite with respect to the longitudinal direction L and follows the course of the circumferential edge of the cleaning element 10 there. In adaptation to the contour of the cleaning finger 5 at the peripheral end 7 ( Fig. 3) The cleaning geometries 11 and 12 each extend in an arc. They each extend over a larger, preferably the predominant, part of the axial or transverse width Q measured at the peripheral end 7 of the cleaning finger 5. The cleaning geometries 11 and 12 each project from a base 15 of the cleaning element 10 in the vertical direction H. They extend in a web-like fashion at the respective end of the cleaning element 10.

[0060] In the longitudinal direction L between the cleaning geometry 11 and cleaning geometry 12, a passage 13 extends in the vertical direction H through the cleaning element 10. The passage 13 extends in the longitudinal direction L and transverse direction Q centrally through the cleaning element 10.

[0061] In a further development, a first pass 13' and a second pass 14' can extend longitudinally L between cleaning geometry 11 and cleaning geometry 12. This alternative is in Fig. 5 is indicated by a dashed line. The two passages 13' and 14' extend side by side through the base 15. The first passage 13' is closer to the first cleaning geometry 11 than the second passage 14'. The second passage 14' is closer to the second cleaning geometry 12 than the first passage 13'. The arrangement is such that along the central longitudinal axis L, the first cleaning geometry 11 is followed by the first passage 13', then by the second passage 14', and finally by the second cleaning geometry 12. The two passages 13' and 14' are separated from each other by a bridge formed by the base 15. In the exemplary embodiment, however, only one passage 13 is formed in the region of this bridge.

[0062] The cleaning element 10 exhibits a twofold rotational symmetry about the vertical axis H with respect to the cleaning geometries 11 and 12 and the passage 13, or alternatively, the passages 13' and 14'. By rotating the cleaning element 10 by 180° about the vertical axis H, the cleaning geometries 11 and 12—and, in the further development, the passages 13' and 14'—exchange their positions. The first cleaning geometry 11 and the second cleaning geometry 12 can thus be selectively brought into the active position, i.e., the radially outer first position, relative to the cleaning finger 5, and the other into the passive, radially inner second position.

[0063] In the advanced training, when the positions of the cleaning geometries 11 and 12 are swapped, the passages 13' and 14' also exchange their position and function. If the first cleaning geometry 11 is in the active position, the cleaning element 10 is attached via the passage 14', which is further away from cleaning geometry 11. If the second cleaning geometry 12 is in the active position, the cleaning element 10 is attached via the passage 13', which is closer to the first cleaning geometry 11. The advantage of this exchange of function is that the passage further away from the peripheral end 7 of the cleaning finger 5 is used in each case. The passage of the cleaning finger 5, i.e.,The passage provided on the cleaning finger 5 for fastening can therefore be provided at a greater distance from the peripheral end 7 of the cleaning finger 5 in terms of strength, compared to the basic version of the cleaning element 10 with only one central passage 13.

[0064] The cleaning geometries 11 and 12 each have an edge at their ends projecting in the vertical direction H, which follows the outer circumferential edge of the cleaning element 10 and can, in particular, form the outer circumferential edge of the cleaning element 10. At their free end, the respective cleaning geometries 11 and 12 form a slender web from which they slope inwards, towards the central transverse axis Q, in a ramp-like manner down to the base 15. The base 15 can, in particular, be disc-shaped or plate-shaped. It can, as in the exemplary embodiment, have a flat upper surface.

[0065] The cleaning element 10 is frictionally attached to the cleaning finger 5 in the vertical direction H, in the exemplary embodiment by means of a rivet connection or alternatively by means of a screw connection, and is additionally held in position by a positive locking mechanism. To reliably prevent rotation on the cleaning finger 5, the cleaning element 10 has a left positioning structure 16 and a right positioning structure 17. The positioning structures 16 and 17 project laterally from the rear of the cleaning element 10, to the left and right of the central longitudinal axis L from the base 15 towards the vertical direction H. Their inner surfaces, which are opposite each other in the transverse direction Q, are shaped to fit the end faces of the cleaning finger 5. In the attached state, the positioning structure 16 rests against one end face and the positioning structure 17 against the opposite end face of the cleaning finger 5.In its attached state, the cleaning element 10 thus encompasses the cleaning finger 5 and encloses it on the left and right.

[0066] As in Fig. As can be seen in section 3, the cleaning finger 5 can have a shoulder 9 radially adjacent to the cleaning element 10, which supports the cleaning element 10 radially inwards, for example in the circumferential area of ​​the second cleaning geometry 12.

[0067] Fig. Figure 8 shows a sieve star 3 with a cleaning element 20 of a second embodiment. The cleaning element 20 is in Fig. 9 as such, detached from the seven-pointed star 3, shown in an isometric view of its front side.

[0068] The cleaning element 20 has a first cleaning geometry 21 and a second cleaning geometry 22. In contrast to the first embodiment, the cleaning geometries 21 and 22 extend over the same end of the cleaning element 20. Fig. 8 The first cleaning geometry 21 assumes the active position, in which it projects radially outwards over a virtual circumcircle applied to the cleaning finger 5 and points in the direction of rotation D. The second cleaning geometry 22 extends at the same end as the first cleaning geometry 21, but on the rear side of the cleaning element 20, which is located in the Fig. In the state shown in Figure 8, the cleaning element 20 is facing the cleaning finger 5 and, as in the first embodiment, is in direct contact with the cleaning finger 5. To reverse the positions, the cleaning element 20 is turned over, namely rotated about its central longitudinal axis L, so that the back side, in the rotated or turned state, becomes the front side and the part shown in Figure 8 is in the front side. Fig. 8 passive cleaning geometry 22 instead of cleaning geometry 21 becomes active cleaning geometry.

[0069] As in the first embodiment, the cleaning geometries 21 and 22 are also free and point in the vertical direction H with a web-shaped free end along their course when the respective cleaning geometry 21 or 22 assumes the active position.

[0070] The cleaning element 20 has a base 25 through which a passage 23, serving for attachment to the cleaning finger 5, extends in the vertical direction H. The base 25 can, in particular, be disc-shaped and form the cleaning element 20 as a whole disc-shaped cleaning element. A groove-shaped recess 26 extends along the outer circumferential edge of the cleaning element 20 on the front side. The cleaning geometry 21 is exposed by the recess 26 in the form of a groove boundary wall. As in the first embodiment, the cleaning geometry 21 forms the outer circumferential edge of the cleaning element 20 at its first end. On the rear side of the cleaning element 20, a rear recess and a rearward or second cleaning geometry 22, exposed by this recess, extend in a mirror image to the front recess 26 and the cleaning geometry 21 exposed by it.

[0071] The cleaning element 20 exhibits twofold rotational symmetry about the central longitudinal axis L with respect to the cleaning geometries 21 and 22. It is mirror-symmetric with respect to a central LQ plane with respect to the cleaning geometries 21 and 22. In the exemplary embodiment, the cleaning element 20 is mirror-symmetric overall with respect to the central LQ plane.

[0072] The cleaning element 20 is attached to the cleaning finger 5 by means of a rivet connection. Fig. Figure 8 shows the shaft element 60 and a washer 62 on the back of the cleaning finger 5. To turn the cleaning element 20, the rivet connection is loosened and destroyed so that the cleaning element 20 can be turned over and the second cleaning geometry 22 can be brought into the active position. It is then reattached to the cleaning finger 5 using a new rivet connection. The rivet connection can, for example, be replaced by a non-destructively detachable screw connection.

[0073] In addition to the clamping fastening, the cleaning element 20 is secured against rotation relative to the cleaning finger 5 by a positive fit. For this positive fit, the cleaning element 20 is flattened at its second end, which is radially inner in the longitudinal direction L, so that the second end forms a flat side. The cleaning finger 5 has a suitably shaped, stepped shoulder 9 on its front side, against which the cleaning element 20 rests with its flat side when fastened.

[0074] The Fig. 10 and Fig. Figure 11 shows a sieve star 3 with a cleaning element 30 of a third embodiment. Fig. 10 is an isometric projection onto the front faces of the fingers 5 of the sieve star 3, and Fig. Figure 11 is an isometric view of the back sides. The cleaning element 30 has a first cleaning geometry 31 on one front side and a second cleaning geometry 32 on one back side, each at its radially outer, first end. The cleaning element 30 is detachably attached to the cleaning finger 5 by means of two screws 60 and threaded nuts 61. Fig. 11 a distribution disc 62 is still visible, over which the threaded nuts 61 are supported on the back of the cleaning finger 5.

[0075] In Fig. Figure 12 shows the cleaning element 30 and one of the two fastening means 60, 61 as well as the distributor disc 62 in a side view. Fig. Figure 13 shows the cleaning element 30 in an isometric view of the area shown in the Fig. 10 and Fig. 11 active cleaning geometry 31.

[0076] The cleaning element 30 has a plate-shaped base 35 with two passages 33 and 34, each for one of the screws 60. The width of the base 35 is adapted to the width of the cleaning finger 5, the width being measured in the transverse direction Q of the cleaning element 30, i.e., parallel to the axis of rotation of the sieve star 3. The passages 33 and 34 extend through the base 35 near the radially inner, second end of the cleaning element 30 in the vertical direction H, with passage 33 extending to one side and passage 34 to the other side of the central longitudinal axis L.

[0077] The cleaning geometries 31 and 32 rise in a ramp-like manner in the longitudinal direction towards the radially outer, first end of the cleaning element 31 up to the outer circumferential edge of the cleaning element 30 - which are located in the Fig. 10 and Fig. The active cleaning geometry 31 is shown in the vertical direction H, and the passive cleaning geometry 32 is shown in the two figures, oriented against the vertical direction H. The cleaning geometries 31 and 32 can be obtained by applying material to the front and opposite rear sides of the base 34, for example, by welding. Alternatively, the cleaning element 30 can also be formed into its final shape using a primary forming process, such as casting or sintering. This also applies to the cleaning elements of the other embodiments.

[0078] The cleaning element 30 exhibits twofold rotational symmetry about the central longitudinal axis L with respect to the cleaning geometries 31 and 32. It is mirror-symmetrical about a central LQ plane with respect to the cleaning geometries 31 and 32, and in the exemplary embodiment also as a whole. To interchange the positions of the cleaning geometries 31 and 32, the cleaning element 30 is turned from the front to the back. For this purpose, the fastening is loosened, the cleaning element 30 is rotated about the central longitudinal axis L so that the previously passive cleaning geometry 32 points in the direction of rotation D, and the cleaning element 30 is reattached to the cleaning finger 5 in the new position.

[0079] Fig. Figure 14 shows a sieve star 3 with a cleaning finger 5, on the front side of which, pointing in the direction of rotation D, a cleaning element 40 of a fourth embodiment is arranged. The cleaning element 40 is attached to the cleaning finger 5 by means of a rivet connection. The rivet connection is visible in Fig. 14 of the rivet and in the side view of the Fig. 15 The rivet head 62 is also visible. Although the rivet connection 60, 62 must be destroyed to loosen the fastening, re-fastening with a new rivet connection is easily possible, since loosening and re-fastening can be carried out without damaging the cleaning element 40 and, in particular, without damaging the cleaning finger 5.

[0080] The cleaning element 40 has a first cleaning geometry 41 and a second cleaning geometry 42, each at its radially outer, first end. In the illustrated state, the cleaning geometry 41 projects at the first end on the front side relative to the sieve star 3 in the direction of rotation D and relative to the cleaning element 40 itself in the vertical direction H, and is thus the active cleaning geometry. The cleaning geometry 42 projects at the first end on the rear side against the direction of rotation D and against the vertical direction H, and thus occupies the passive position.

[0081] While the cleaning geometries of the other embodiments extend only over a peripheral end section of the respective cleaning finger 5, the cleaning element 40 is extended into the base region 6 of the sieve star 3. The sieve star 3 has a recess in the base region 6 between the cleaning finger 5 and the next finger 5 advancing in the direction of rotation D, into which the cleaning element 40 projects with a shaft 46. The end section of the shaft 46 projecting into the recess is Fig. 15 is shown in a dashed line. The shaft 46 is straight and projects, at least substantially, tangentially into the base area 6 with respect to the axis of rotation R of the sieve star 3. The shaft 46 can project as far as the hub 4.

[0082] In the Fig. 16 and Fig. Figure 17 shows the cleaning element 40 as such, once in an isometric view and once in a side view. The cleaning element 40 has a base 45 through which a passage 43 for the fastening element 60 extends in the vertical direction. At the first end of the cleaning element 40, the cleaning geometry 41 projects vertically H on the front side, and the cleaning geometry 42 projects in the opposite direction H on the rear side. The cleaning geometry 41 on the front side and the cleaning geometry 42 on the rear side rise ramp-like towards the free first end of the cleaning element 40. This ramp ensures that the radially outer edge of the respective cleaning geometry is re-sharpened during gradual material removal in operation and remains as an edge.

[0083] The cleaning element 40 can taper from the base 45 to the shaft 46, so that the recess formed in the foot area 6 of the sieve star 3, into which the shaft 46 protrudes when attached, can be correspondingly narrow and does not unnecessarily weaken the foot area 6.

[0084] A cleaning element supported in the base of a sieve star is known in principle from EP 1 088 599 B1. However, unlike the known cleaning element, cleaning element 40 is invariant with respect to rotation about a central longitudinal axis L inherent to the body. In the exemplary embodiment, the cleaning element 40 is straight along its entire length in longitudinal sections, so that when the active cleaning geometry wears, it remains in the Fig. 14 and Fig. 15 of the cleaning geometry 41, can be turned from the front to the back, and the cleaning geometries 41 and 42 can be interchanged with respect to their position. In this process, the cleaning geometries 41 and 42 replace each other, at least functionally. The cleaning element 40 has a twofold rotational symmetry about the central longitudinal axis L with respect to the cleaning geometries 41 and 42. In the exemplary embodiment, it is mirror-symmetric with respect to a central LQ plane.

[0085] In the Fig. 18 and Fig. Figure 19 shows an arrangement of cleaning elements 50 of a fifth embodiment. The arrangement comprises a retaining structure 57 with one or more passages 59, in the embodiment with two passages 59, for each fastening element for attaching the retaining structure 57 to a front face of a cleaning finger of a sieve star. The retaining structure 57 is plate-shaped. The retaining structure 57 with the multiple cleaning elements 50 can, like the cleaning element 30 of the third embodiment, be attached to the cleaning finger 5 of the sieve star 3 and replace the cleaning element 30.

[0086] The cleaning elements 50 are arranged side by side at a first end of the holding structure 57, following an outer circumferential edge of the holding structure 57. The cleaning elements 50 are identical to one another. Each of their free front ends, which project beyond the circumferential edge of the holding structure 57, has a first cleaning geometry 51. The cleaning geometries 51 of the adjacent cleaning elements 50 together form a composite cleaning geometry. The cleaning geometry composed of the individual cleaning geometries 51 is arc-convex and thus follows a correspondingly arc-convex curve of the peripheral end of the cleaning finger, for which the arrangement consisting of the holding structure 57 and the cleaning elements 50 is intended.

[0087] In Fig. Figure 20 shows a variant in which a modified holding structure 58 has a straight outer circumferential edge at its first end and otherwise corresponds at least substantially to the holding structure 57. The cleaning elements 50 attached to the holding structure 58 are, as such, part of the cleaning elements 50 of the Fig. 18 and Fig. 90 identical. However, their active cleaning geometries 51 together form a composite rectilinear cleaning geometry.

[0088] One of the cleaning elements 50 is in Fig. 21, separated from the assembly, is shown individually in an isometric view of its front face. Each of the cleaning elements 50 has a first cleaning geometry 51 at one end and a second cleaning geometry 52 at a second end opposite it in the longitudinal direction. The cleaning geometries 51 and 52 project from a base 55 in the vertical direction H on the front face of the cleaning element 50 and form the outer circumferential edge of the cleaning element 50 at their respective ends.

[0089] The cleaning elements 50 are each detachably attached to the holding structure 57, for example by means of a screw connection. For the purpose of attachment, each of the cleaning elements 50 has a passage 56 that extends in the vertical direction H through the base 55. If the [partial] wears out, as shown in the illustration of the Fig. 18 active cleaning geometry 51, the respective cleaning element 50 can be detached and rotated about its vertical axis H, so that the second cleaning geometry 52 comes into the active position instead of the first cleaning geometry 51, and is then reattached to the holding structure 57 or 58.

[0090] The cleaning element 50 has, in addition to the two cleaning geometries 51 and 52, further cleaning geometries 53 and 54. These additional cleaning geometries 53 and 54 also project from the base 55 in the vertical direction H on the front of the cleaning element 50. When the cleaning geometry 51 assumes the active position, the additional cleaning geometries 53 and 54 extend along the left and right lateral circumferential edges of the cleaning element 50. The cleaning element 50 has 4-fold rotational symmetry about the vertical axis H with respect to the cleaning geometries 51, 52, 53, and 54. Each of the cleaning geometries 52, 53, and 54 can perform the functions described in the Fig. Replace cleaning geometry 51, which is in active position, with equivalent components from 18 to 20. Reference symbol: 1 shaft, support 2 shaft, carrier 3 Siebstern 4 hub 5 fingers 6 foot area 7 peripheral end 8th round 9 Shoulder 10 cleaning elements 11 Cleaning geometry 12 Cleaning geometry 13th round 13' passage 14' passage 15 base 16 Positioning structure 17 Positioning structure 20 cleaning elements 21 Cleaning geometry 22 Cleaning geometry 23rd round 24 rounds 25 base 26 In-depth study 30 cleaning elements 31 Cleaning geometry 32 Cleaning geometry 33rd round 34th round 35 base 40 cleaning elements 41 Cleaning geometry 42 Cleaning geometry 43rd round 44 rounds 45 base 46 shaft 50 cleaning elements 51 Cleaning geometry 52 Cleaning geometry 53 Cleaning geometry 54 Cleaning geometry 55 Base 56th pass 57 Support structure 58 Support structure 59th round 60 Fastening element, threaded bolt 61 Fastening element, threaded nut 62 Fastening element, distributor element Direction of rotation H Vertical direction, vertical axis L Longitudinal direction, longitudinal axis Q transverse direction, transverse axis R axis of rotation QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 1 088 599 B1 [0002, 0084]

Claims

[1] Sieve star for a sieving device for sifting a material to be sieved, such as municipal waste, wood chips or soil-covered crops, the sieve star comprising: 1.1 a hub (4) that defines an axis of rotation (R) of the sieve star (3), 1.2 Several elastically compliant fingers (5) made of plastic or rubber are distributed around the axis of rotation (R), projecting from a foot area (6) near the hub (4) to a free peripheral end (7), with at least one of the fingers (5) serving as a cleaning finger (5), and 1.3 a cleaning element (10; 20; 30; 40; 50) detachably attached to the cleaning finger (5) made of a material that is harder than the plastic or rubber of the fingers (5), wherein 1.4 the cleaning element (10; 20; 30; 40; 50) can be optionally attached to the cleaning finger (5) in a first and a second orientation, 1.5 the cleaning element (10; 20; 30; 40; 50) has a first cleaning geometry (11; 21; 31; 41; 51) and a second cleaning geometry (12; 22; 32; 42; 52), 1.6 In the first orientation, the first cleaning geometry (11; 21; 31; 41; 51) and in the second orientation, the second cleaning geometry (12; 22; 32; 42; 52) take an active position, while the other cleaning geometry takes a passive position. 1.7 the cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51, 52) in the active position points in the direction of rotation (D) of the sieve star (3) and / or radially outwards, and 1.8 the cleaning geometry of the hub (4) in the passive position is radially closer than the cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51, 52) in the active position and / or points against the direction of rotation (D) of the sieve star (3). [2] Sieve star according to the preceding claim, wherein - the cleaning element (10; 20; 30; 40; 50) has a front and a back side which face away from each other in a vertical direction (H) of the cleaning element (10; 20; 30; 40; 50), - the first cleaning geometry (11; 21; 31; 41; 51) is formed on the front at a radially outer first end of the cleaning element (10; 20; 30; 40; 50), - the second cleaning geometry (12; 22; 32; 42; 52) is formed on the front and / or on a radially inner second end of the cleaning element (10; 20; 30; 40; 50) or on the back, - the cleaning element (10; 20; 30; 40; 50) is attached to the sieve star (3) in the first orientation, so that the back side points towards the upward direction (H) towards the cleaning finger (5), for example, resting against the cleaning finger (5), - the cleaning element (10; 50) can be brought from the first orientation to the second orientation by rotating the cleaning element (10; 50) about a vertical axis (H) extending in the vertical direction (H) when forming the second cleaning geometry (12; 52) on the front side, and - the cleaning element (20; 30; 40) can be brought from the first orientation to the second orientation by rotating the cleaning element (20; 30; 40; 50) about a longitudinal axis (L) orthogonal to the vertical direction (H) when forming the second cleaning geometry (22; 32; 42) on the back. [3] Sieve star according to the preceding claim, wherein the vertical axis (H) extends in the direction of rotation (D) of the sieve star (3) or is inclined at an angle of inclination of less than 45° to the direction of rotation (D) of the sieve star (3). [4] Sieve star according to one of the preceding claims, wherein the cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51, 52) in the active position extends to at least a virtual circumcircle of the sieve star (3) touching the peripheral end of the cleaning finger (5). [5] Sieve star according to one of the preceding claims, wherein - the cleaning element (10; 50) has a front and a back side which are opposite each other in a vertical direction (H) of the cleaning element (10; 50), - the first cleaning geometry (11; 51) and the second cleaning geometry (12; 52) are formed on the front side, - the cleaning element (10; 50) in the first orientation and in the second orientation each with its back side facing the upward direction (H) towards the cleaning finger (5), for example resting against the cleaning finger (5), and - the cleaning element (10; 50) can be moved from one of the orientations to the other by means of rotation about a vertical axis (H) extending in the vertical direction (H). [6] Sieve star according to any one of claims 1 to 4, wherein - the cleaning element (20; 30; 40) has a front and a back side which face away from each other in a vertical direction (H) of the cleaning element (20; 30; 40), - the first cleaning geometry (21; 31; 41) is formed on the front and the second cleaning geometry (22; 32; 42) on the back, - the cleaning element (20; 30; 40) in the first orientation with its back and in the second orientation with its front against the upward direction (H) towards the cleaning finger (5), for example, resting against the cleaning finger (5), and - the cleaning element (20; 30; 40) can be moved from one of the orientations to the other by means of rotation about a longitudinal axis (L) orthogonal to the vertical direction (H). [7] Sieve star according to one of the preceding claims, wherein - the cleaning element (50) has a front and a back which are opposite each other in a vertical direction (H) of the cleaning element (50), - the cleaning element (50) has a third cleaning geometry (53) on the front side and can optionally also be attached to the cleaning finger (5) in a third orientation, in which the third cleaning geometry (53) assumes an active position and both the first cleaning geometry (51) and the second cleaning geometry (52) assume a passive position, and - the cleaning element (50) can be brought from the first orientation to the third orientation by means of rotation about a vertical axis (H) extending in a vertical direction (H). [8] Sieve star according to the preceding claim, wherein - the second cleaning geometry is formed on the back and the cleaning element (50) can be moved from the second orientation to the third orientation by rotating it around the longitudinal axis (L), or - the second cleaning geometry (52) is formed on the front and the cleaning element (50) can be moved from the first and also from the second orientation into the third orientation by rotation about the vertical axis (H). [9] Sieve star according to one of the preceding claims, comprising a retaining structure (57; 58) attached to the cleaning finger (5) and several cleaning elements (50), each corresponding to the cleaning element (50) described in at least one of the preceding claims, wherein the cleaning elements (50) are detachably attached side by side in a transverse direction (Q) parallel to the axis of rotation (R) in the first orientation on the retaining structure (57; 58), so that they together form a cleaning geometry which is composed of the first cleaning geometries (51) of the individual cleaning elements (50). [10] Sieve star according to the preceding claim, wherein the cleaning elements (50) are identical. [11] Sieve star according to one of the preceding claims, wherein the first cleaning geometry (11; 21; 31; 41; 51) and the second cleaning geometry (12; 22; 32; 42; 52) and the third cleaning geometry (53), if any, are geometrically identical. [12] Sieve star according to one of the preceding claims, wherein the cleaning element (10; 20; 30; 40) rests against the cleaning finger (5). [13] Sieve star according to any one of claims 1 to 11, comprising a holding structure (57; 58), wherein the cleaning element (50) is attached to the holding structure (57; 58) and the holding structure (57; 58) is attached to the cleaning finger (5). [14] Sieve star according to the preceding claim, wherein the cleaning elements (50) are detachably attached to the holding structure (57; 58) and / or the holding structure (57; 58) is detachably attached to the cleaning finger (5) in order to be able to change the orientation of the cleaning elements (50). [15] Sieve star according to one of the preceding claims, wherein - the cleaning element (10; 20; 30; 40; 50) has a front and a back side which face away from each other in a vertical direction (H) of the cleaning element (10; 20; 30; 40; 50), - the first cleaning geometry (11; 21; 31; 41; 51) is free at the first end on the front of the cleaning element (10; 20; 30; 40; 50), for example projecting in the vertical direction (H), and - the second cleaning geometry (12; 22; 32; 42; 52) is free at the second end on the front of the cleaning element (10; 50), for example projecting in the vertical direction (H), or is free at the rear of the cleaning element (20; 30; 40), for example projecting against the vertical direction (H). [16] Sieve star according to one of the preceding claims, wherein the cleaning element (10; 20; 30; 40; 50) has a passage (13; 13', 14'; 23; 33; 43, 44; 59) and is attached to the cleaning finger (5) by means of a fastening element (60), and wherein the fastening element (60) extends through the passage (13; 23; 33; 43, 44; 59) into and preferably through the cleaning finger (5) or a retaining structure (57; 58) attached to the cleaning finger (5). [17] Sieve star according to the preceding claim, wherein the fastening element (60) projects into and preferably through the cleaning finger (5) and clamps the cleaning element (10; 20; 30; 40) against the cleaning finger (5) on a side of the cleaning finger (5) that leads in the direction of rotation (R) of the sieve star (3). [18] Sieve star according to one of the preceding claims, wherein the cleaning element (10) has a first passage (13') and a second passage (14') which extend through the cleaning element (10) for fastening the cleaning element (10), and wherein the first passage (13') is closer to the first end of the cleaning element (10) than the second passage (14'). [19] Sieve star according to the preceding claim, wherein the first passage (13') and the second passage (14') are arranged along a longitudinal axis (L) of the cleaning element (10) and the cleaning geometries (11, 12) and passages (13', 14') are axially symmetric in a top view of the front of the cleaning element (10) with respect to a transverse axis (Q) which is orthogonal to the longitudinal axis (L) and intersects it in the top view between the passages (13', 14'). [20] Sieve star according to one of the two immediately preceding claims, wherein the cleaning element (10) is attached to the cleaning finger (5) by means of a fastening element (60), and wherein the fastening element (60) projects into and preferably through the cleaning finger (5) at the same position in the first orientation of the cleaning element (10) through the first passage (13') and in the second orientation of the cleaning element (10) through the second passage (14'). [21] Sieve star according to one of the preceding claims, wherein the cleaning element (10; 20; 30; 40) is attached to the cleaning finger (5) by friction and preferably also by positive locking. [22] Sieve star according to one of the preceding claims, wherein the cleaning element (10; 20; 30; 40) is attached to the cleaning finger (5) by means of a fastening element (60), and wherein the fastening element (60) is a screw for direct screw engagement with the cleaning finger (5) or a threaded bolt for threaded engagement with a threaded nut or a rivet element. [23] Sieve star according to one of the seven immediately preceding claims, wherein the fastening element (60) and the respective passage (13; 13', 14'; 23; 33, 34; 43; 59) are adapted to each other with respect to the cross-section in order to secure the cleaning element (10; 20; 30; 40; 50) in a direction radial to the axis of rotation (R) relative to the cleaning finger (5). [24] Sieve star according to one of the preceding claims, wherein one or more positioning structures (16, 17) project from the rear of the cleaning element (10), for example one or more positioning ribs (16, 17), and the respective positioning structure (16) rests against an end face of the cleaning finger (5). [25] Sieve star according to the preceding claim, wherein a first positioning structure (16) and a second positioning structure (16) project axially opposite the rear side of the cleaning element (10), one of which abuts a right and the other a left end face of the cleaning finger (5), so that the cleaning element (10) encompasses the cleaning finger (5). [26] Sieve star according to one of the preceding claims, wherein the cleaning finger (5) forms a stop on a side advancing in the direction of rotation (D) of the sieve star (3), against which the cleaning element (10; 20) rests in a stop contact on a side facing the foot area (6) of the sieve star (3). [27] Star sieve according to one of claims 1-4, 6, 12, 15-17 and 21-25 wherein - the cleaning element (40) has a front and a back which are opposite each other in a vertical direction (H) of the cleaning element (40), - the first cleaning geometry (41) is formed at a radially outer first end of the cleaning element (40) at the front, - the second cleaning geometry (42) is formed at the first end of the cleaning element (40) on the back, - the cleaning element (40) extends between the cleaning finger (5) and a preceding finger (5) in the direction of rotation (D) to the foot area (6) of the sieve star (3), preferably to the hub (4), - the cleaning element (40) can be brought from the first orientation to the second orientation by means of rotation about a longitudinal axis (L) of the cleaning element (40) that is orthogonal to the vertical direction (H). [28] Sieve star according to the preceding claim, wherein the cleaning element (40) is straight over its entire length. [29] Sieving device for sieving a feed material, such as municipal waste, wood chips or soil-covered crops, comprising the sieving device: (1) several star-shaped sieves (3) arranged to rotate about a common first axis of rotation (R1) and each having several fingers (5) distributed around the first axis of rotation (R1), which project from a foot region (6) of the respective star-shaped sieve (3) to a free peripheral end (7) from the first axis of rotation (R1), (2) several further sieve stars (3) which are arranged to rotate about a common second axis of rotation (R2) and which each have several fingers (5) distributed around the second axis of rotation (R2), which project from a foot region (6) of the respective sieve star (3) to a free peripheral end (7) from the second axis of rotation (R2), (3) wherein the sieve stars (3) rotatable about the first axis of rotation (R1) and the sieve stars (3) rotatable about the second axis of rotation (R2) interlock in a combing manner, and (4) wherein one or more of the sieve stars (3) is or are a sieve star according to any of the preceding claims. [30] Cleaning element for a sieve star of a sieving device for sieving a material to be sieved, such as municipal waste, wood chips or soil-covered crops, the cleaning element comprising (10; 20; 30; 40; 50): (1) a front and a back facing away from each other in a vertical direction (H) of the cleaning element (10; 20; 30; 40; 50), (2) a first end and a second end spaced apart in a longitudinal direction (L) of the cleaning element (10; 20; 30; 40; 50), (3) a first cleaning geometry (11; 21; 31; 41; 51) on the front at the first end of the cleaning element (10; 20; 30; 40; 50), (4) a second cleaning geometry (12; 22; 32; 42; 52) on the rear and / or second end of the cleaning element (10; 20; 30; 40; 50), and (5) a base (15; 25; 35; 45; 55) with a first passage (13; 13'; 23; 33; 43; 53) and optionally a second passage (14'; 34), wherein each passage extends from the front to the back through the cleaning element (10; 20; 30; 40; 50). [31] Cleaning element according to the preceding claim, wherein - the first cleaning geometry (11; 21; 31; 41; 51) is free at the first end on the front of the cleaning element (10; 20; 30; 40; 50), for example projecting in the vertical direction (H), and - the second cleaning geometry (12; 22; 32; 42; 52) is free at the front at the second end of the cleaning element (10; 50), for example projecting in the vertical direction (H), or is free at the rear of the cleaning element (20; 30; 40; 50), for example projecting against the vertical direction (H). [32] Cleaning element according to one of the two immediately preceding claims, wherein the respective cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51; 52) extends along an outer circumferential edge of the cleaning element (10; 20; 30; 40; 50) with respect to the longitudinal direction (L). [33] Cleaning element according to one of the three immediately preceding claims, wherein the respective cleaning geometry (11, 12; 21, 22; 31; 32; 41, 42; 51, 52) is rib- or web-shaped or rises in a ramp-like manner. [34] Cleaning element according to one of the four immediately preceding claims, wherein the respective cleaning geometry (11, 12; 21, 22; 31, 32; 41, 42; 51, 52) forms an edge. [35] Cleaning element according to one of the five immediately preceding claims, wherein the respective cleaning geometry (31, 32; 41, 42; 51, 52) rises ramp-like from the base (35; 45; 55) on the front in the vertical direction (H) or on the rear against the vertical direction (H). [36] Cleaning element according to one of the six immediately preceding claims, wherein the cleaning geometries (11, 12; 51, 52) are axially symmetric with respect to a transverse axis (Q) which is orthogonal to the longitudinal direction (L) in a top view of the front of the cleaning element (10; 50). [37] Cleaning element according to one of the seven immediately preceding claims, wherein the cleaning geometries (21, 22; 31, 32; 41, 42; 51; 52) are symmetrical with respect to a plane extending between the front and the back in the longitudinal and transverse direction (L, Q). [38] Cleaning element according to one of the eight immediately preceding claims, wherein the cleaning element (10; 50) is axially symmetric with respect to a transverse axis (Q) which is orthogonal to the longitudinal direction (L) in a top view of the front of the cleaning element (10; 50). [39] Cleaning element according to one of the nine immediately preceding claims, wherein the cleaning element (20; 30; 40; 50) is symmetrical with respect to a plane extending between the front and the back in the longitudinal and transverse direction (L, Q). [40] Cleaning element according to one of the ten immediately preceding claims, comprising the second passage (14'), wherein the first passage (13') is closer to the first end of the cleaning element (10) than the second passage (14'). [41] Cleaning element according to the preceding claim, wherein the second cleaning geometry (12) is formed at the second end and preferably at the front of the cleaning element (10), and the second passage (14') is closer to the second end of the cleaning element (10) than the first passage (13'). [42] Cleaning element according to one of claims 30 to 41, comprising the second passage (14'), wherein the first passage (13') and the second passage (14') are arranged side by side along a longitudinal axis (L) of the cleaning element (10) extending in the longitudinal direction (L) and the cleaning geometries (11, 12) and passages (13', 14') are axially symmetric with respect to a transverse axis (Q) which, in a top view of the front of the cleaning element (10), is orthogonal to the longitudinal axis (L) and intersects it between the passages (13', 14'). [43] Cleaning element according to one of claims 30 to 42, comprising the second passage (14'), wherein the base (15) of the cleaning element (10) forms a bridge between the passages (13', 14') that separates the passages (13, 14) from each other. [44] Cleaning element according to any one of claims 30 to 43, wherein the cleaning element (10) is elongated oval in a top view of the front in the longitudinal direction (L). [45] Cleaning element according to one of claims 30 to 44, which can be attached to a finger (5) of the sieve star (1) so that its rear side rests against a leading side of the cleaning finger (5), wherein a positioning structure (16) projects against the vertical direction (H) on the rear side of the cleaning element (10), for example a positioning rib (16) extending in the longitudinal direction (L), and the positioning structure (16) rests against an end face of the finger (5) when the cleaning element (10) is attached to the cleaning finger (5). [46] Cleaning element according to the preceding claim, comprising a further positioning structure (17) projecting at the rear of the cleaning element (10) in the vertical direction (H), for example a positioning rib (16) extending in the longitudinal direction (L), wherein the positioning structures (16, 17) are spaced apart from each other along a transverse axis (Q) orthogonal to the longitudinal direction (L), such that the positioning structures (16, 17) enclose the cleaning finger (5) at a right and a left end face when the cleaning element (10) is attached to the cleaning finger (5). [47] Cleaning element according to any one of claims 30 to 46, wherein - the cleaning element (20) has a front and a back which are opposite each other in a vertical direction (H) of the cleaning element (20), - the cleaning element (20) has a first groove (26) and a second groove, - wherein the first groove (26) extends along the front side following a radially outer circumferential edge of the cleaning element (20), so that a web remains on the front side between the first groove (26) and the outer circumferential edge, which forms the first cleaning geometry (21), and - wherein the second groove extends along the rear side following the radially outer circumferential edge of the cleaning element (20), so that a rib remains on the rear side between the second groove and the outer circumferential edge, forming the second cleaning geometry (22). [48] ​​Cleaning element according to any one of claims 30 to 47, wherein - the cleaning element (20) has a front and a back which are opposite each other in a vertical direction (H) of the cleaning element (20), - the cleaning element (20) has a passage (26) which extends through the cleaning element in the vertical direction (H) following a radially outer circumferential edge of the cleaning element (20), - so that a bridge remains between the passage (26) and the outer circumferential edge, forming the first cleaning geometry (21) on the front and the second cleaning geometry (22) on the back. [49] Cleaning element according to any one of claims 30 to 48, wherein - the cleaning geometries (41, 42) are formed at the first end of the cleaning element (40) and - the cleaning element (40) has a shaft (46) which projects from the base (45) in the longitudinal direction (L) and is preferably narrower than the base (45) in plan view, - wherein the base (45) extends from the first end of the cleaning element (40) in the longitudinal direction (L) to the shaft (46), and - the cleaning element (40) is straight in longitudinal section from the first end to a free end of the shaft (45). [50] Cleaning element according to one of claims 30 to 49, each in combination with a fastening element (60), preferably a rivet or threaded element, which can be guided through the respective passage (13, 14; 23; 33, 34; 43; 56) for fastening the cleaning element (10; 20; 30; 40; 50). [51] Cleaning element according to the preceding claim, wherein the fastening element (60) is configured to clamp the cleaning element (10; 20; 30; 40; 50) in an engagement against a front face of the cleaning finger (5) that advances in the direction of rotation or against a retaining structure (56) that can be attached to the cleaning finger (5). [52] Cleaning element according to any one of claims 30 to 51, characterized by the use as a cleaning element of a sieve star (3) according to any one of claims 1 to 29. [53] Cleaning element according to one of claims 30 to 52, each in combination with a sieve star (3), which - a hub (4) that defines an axis of rotation (R1) of the sieve star (3), and - distributed around the axis of rotation (R1) comprises several fingers (5) that project from one of the foot areas (6) near the hub (4) to each free peripheral end (7), - wherein the cleaning element (10) can be attached to one of the fingers (5) or is already attached. [54] Cleaning element according to any one of claims 30 to 53, which forms the cleaning element (10; 20; 30; 40; 50) according to any one of claims 1 to 29.

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