Sieving device

Abstract

The invention is based on a sieving device with at least one rotary drum unit comprising a plurality of sieving openings, said sieving openings being respectively arranged around a centre point of the sieving openings and being categorized in at least one structure group and at least one further structure group and at least one further structure group, wherein the first structure group the centre points of neighbouring sieving openings are arranged at a first intra-distance to one another, and wherein in the further structure group the centre points of neighbouring sieving openings are arranged at a further intra-distance to one another, wherein the smallest structure distance between a centre point of at least one sieving opening in the at least one first structure group and a nearest situated center point of at least one sieving opening in the at least one further structure group is greater than the first intra-distance.

Claims

1. A sieving device with at least one rotary drum unit comprising a plurality of sieving openings, said sieving openings being respectively arranged around a centre point of the sieving openings and being categorized in at least one first structure group and at least one further structure group, wherein in the first structure group the centre points of neighbouring sieving openings are arranged at a first intra-distance to one another, and wherein in the further structure group the centre points of neighbouring sieving openings are arranged at a further intra-distance to one another, wherein a smallest structure distance between a centre point of at least one sieving opening in the at least one first structure group and a nearest-situated centre point of at least one sieving opening in the at least one further structure group is greater than the first intra-distance, wherein the sieving device comprises at least one further first structure group, wherein a centre point of at least one sieving opening in the at least one first structure group realizes a smallest structure repetition distance to a nearest-situated centre point of at least one sieving opening in the at least one further first structure group, said smallest structure repetition distance being greater than the first intra-distance and/or than the furthest intra-distance, and wherein the sieving openings in the at least one first structure group and the sieving openings in the at least one further structure group have a same shape.

2. The sieving device according to claim 1, wherein the smallest structure distance is smaller than the further intra-distance.

3. The sieving device according to claim 1, wherein the smallest structure repetition distance is greater than the structure distance.

4. The sieving device according to claim 1, wherein the at least one first structure group is implemented as a zigzag structure line.

5. The sieving device according to claim 1, wherein the at least one further structure group is implemented as a straight structure line.

6. The sieving device according to claim 1, wherein the sieving openings in the at least one first structure group and/or the sieving openings in the at least one further structure group have a rounded shape.

7. The sieving device according to claim 1, wherein the sieving openings in the at least one first structure group and/or the sieving openings in the at least one further structure group have an angular shape.

8. A method for a production of a sieving device according to claim 1.

Description

DRAWINGS

(1) Further advantages may be gathered from the following description of the drawings. The drawings show two exemplary embodiments of the invention. The drawings, the description and the claims contain a plurality of features in combination. Someone skilled in the art will purposefully also consider the features individually and will find further expedient combinations.

(2) It is shown in:

(3) FIG. 1 a sieving device according to the invention in a schematic representation,

(4) FIG. 2 a perforated metal sheet for a rotary drum unit of the sieving device according to the invention in a schematic representation,

(5) FIG. 3 a method according to the invention in a schematic representation and

(6) FIG. 4 a perforated metal sheet for a rotary drum unit of an alternative sieving device according to the invention in a schematic representation.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

(7) FIG. 1 shows a sieving device 10a. The sieving device 10a is embodied as a rotation sieving device. The sieving device 10a is configured for sieving materials to be sieved 18a, like for example food and/or chemical substances, by a rotary movement, in particular for separating off foreign materials out of powders and/or for sorting particle sizes of the powder.

(8) The sieving device 10a comprises an at least substantially rectangular-cuboid-shaped housing unit 12a. The sieving device 10a comprises a rotary drum unit 14a, which is in particular configured for the sieving of the material to be sieved 18a. The rotary drum unit 14a is, in particular at least substantially completely, arranged in the housing unit 12a. The rotary drum unit 14a is embodied as a hollow-cylinder unit defining a cylinder axis 30a.

(9) The sieving device 10a comprises a filling-in channel 16a for a filling-in of the material to be sieved 18a into the housing unit 12a, preferably into the rotary drum unit 14a. By way of the rotary movement the rotary drum unit 14a separates the material to be sieved 18a into a finer sieving portion 20a, which drops out of the rotary drum unit 14a, and a rougher sieving portion 22a, which in a sieving operation wanders through the rotary drum unit 14a along a longitudinal axis 24a of the rotary drum unit 14a.

(10) The longitudinal axis 24a of the rotary drum unit 14a is in particular aligned parallel to a longitudinal axis 26a of the sieving device 10a, in particular of the housing unit 12a. The longitudinal axis 24a of the rotary drum unit 14a is in particular aligned parallel to the cylinder axis 30a.

(11) The sieving device 10a comprises a motor unit 28a, which is configured to drive the rotary drum unit for a rotation.

(12) The motor unit 28a is configured to drive the rotary drum unit 14a for a rotation around the cylinder axis 30a. The sieving device 10a comprises a materially implemented suspension axle 32a, which the rotary drum unit 14a is connected to. The suspension axle 32a is connected to the motor unit 28a, in particular via a gear unit 34a. The sieving device 10a may comprise the gear unit 34a. The motor unit 28a is configured to drive the suspension axle 32a for a rotation, in particular to drive the rotary drum unit 14a via the suspension axle 32a.

(13) The rotary drum unit 14a is, for example, implemented of a perforated metal sheet 36a, which is in particular bent to form a cylinder, in particular forming a perforated sieving cylinder.

(14) The rotary drum unit 14a comprises cylinder frame elements 38a, which the metal sheet 36a is connected to, by which the metal sheet 36a is in particular held in shape and via which the metal sheet 36a is connected with the suspension axle 32a.

(15) The rotary drum unit 14a comprises, in particular on an inner side of the cylinder at the metal sheet 36a, a rotary impeller unit 40a for a mixing and conveying of the material to be sieved 18a in a rotation.

(16) FIG. 2 shows the metal sheet 36a of the rotary drum unit 14a, in particular in a planar, non-bent state for the purpose of illustrating the arrangement of sieving openings 42a. By way of example and to provide a better overview, only one sieving opening 42a has been given a reference numeral.

(17) The rotary drum unit 14a, in particular the metal sheet 36a, comprises a plurality of sieving openings 42a, which have an identical size and an identical shape. The sieving openings 42a are respectively, in particular symmetrically, arranged around a centre point of the sieving openings 42a.

(18) The sieving openings 42a are categorized into first structure groups 44a, 44a′, 44a″ and further structure groups 46a, 46a′. FIG. 2 exemplarily shows that the sieving device 10a comprises a first structure group 44a. FIG. 2 exemplarily shows that the sieving device 10a comprises two further first structure groups 44a′, 44a″. The sieving device 10a comprises a further structure group 46a. The sieving device 10a comprises an additional further structure group 46a′.

(19) The first structure groups 44a, 44a′, 44a″ are each embodied as a zigzag structure line. In particular, shortest distances between neighbouring, in particular respectively nearest-situated, sieving openings 42a in the first structure groups 44a, 44a′, 44a″ extend in a zigzag structure line.

(20) The further structure groups 46a are each embodied as a straight structure line. In particular, shortest distances between neighbouring, in particular respectively nearest-situated, sieving openings 42a in the further structure groups 46a, 46a′ extend in a straight structure line.

(21) Respectively two neighbouring first structure groups 44a, 44a′, 44a″ are implemented as zigzag structure lines that are inverted to one another, in particular forming hexagon groups 58a of sieving openings 42a. In centre points of the hexagon groups 58a, sieving openings 42a of the further structure groups 46a, 46a′ are arranged respectively.

(22) The sieving openings 42a in the first structure groups 44a, 44a′, 44a″ and the sieving openings 42a in the further structure groups 46a, 46a′ have a same shape, in particular a same outer contour. The sieving openings 42a in the first structure groups 44a, 44a′, 44a″ and the sieving openings 42a in the further structure groups 46a, 46a′ have a rounded shape, in particular a circular shape.

(23) The centre points of neighbouring sieving openings 42a in the first structure groups 44a, 44a′, 44a″ are arranged at a first intra-distance 48a to one another. The centre points of neighbouring sieving openings 42a in the further structure groups 46a, 46a′ are arranged at a further intra-distance 50a to one another.

(24) A smallest structure distance 52a is realized between a centre point of at least one sieving opening 42a in the first structure groups 44a, 44a′, 44a″ and a nearest-situated centre point of at least one sieving opening 42a in the further structure groups 46a, 46a′.

(25) The smallest structure distance 52a between a centre point of at least one sieving opening 42a in the first structure groups 44a, 44a′, 44a″ and a nearest-situated centre point of at least one sieving opening 42a in the further structure groups 46a, 46a′ is greater than the first intra-distance 48a.

(26) The smallest structure distance 52a, in particular between a centre point of at least one sieving opening in the first structure groups 44a, 44a′, 44a″ and a nearest-situated centre point of at least one sieving opening 42a in the further structure groups 46a, 46a′ is smaller than the further intra-distance 50a.

(27) A smallest structure repetition distance 54a is greater than the, in particular smallest, structure distance 52a.

(28) A centre point of at least one sieving opening 42a in the first structure group 44a realizes a smallest structure repetition distance 54a to a nearest-situated centre point of at least one sieving opening 42a in the at least one further first structure group 44a′. The smallest structure repetition distance 54a is greater than the first intra-distance 48a. The smallest structure repetition distance 54a is greater than the further intra-distance 50a.

(29) A smallest further structure repetition distance 56a is greater than the, in particular smallest, structure distance 52a.

(30) A centre point of at least one sieving opening 42a in the further structure group 46a realizes a smallest further structure repetition distance 56a to a nearest-situated centre point of at least one sieving opening 42a in the at least one additional further structure group 46a′. The smallest further structure repetition distance 56a is greater than the first intra-distance 48a. The smallest further structure repetition distance 56a is greater than the further intra-distance 50a.

(31) FIG. 3 schematically shows a method for a production of the sieving device 10a.

(32) In a method step, in particular a perforation step 60a, the at least one rotary drum unit 14a, in particular the at least one metal sheet 36a, is provided with a plurality of sieving openings 42a, which are respectively arranged around a centre point of the sieving openings 42a and which are categorized into the at least one further structure group 44a, 44a′, 44a″ and the at least one further structure group 46a, 46a′, wherein in the first structure group 44a, 44a′, 44a″ the centre points of neighbouring sieving openings 42a are arranged at the first intra-distance 48a to one another and wherein in the further structure group 46a, 46a′ the centre points of neighbouring sieving openings 42a are arranged at the further intra-distance 50a to one another, and wherein a smallest structure distance 52a between a centre point of at least one sieving opening 42a in the at least one first structure group 44a, 44a′, 44a″ and a nearest-situated centre point of at least one sieving opening 42a in the at least one further structure group 46a, 46a′ is greater than the first intra-distance 48a.

(33) In FIG. 4 a further exemplary embodiment of the invention is shown. The following description and the drawing are essentially limited to the differences between the exemplary embodiments, wherein regarding identically denominated components, in particular regarding components having the same reference numerals, principally the drawings and/or the description of the other exemplary embodiment of FIGS. 1 to 3 may be referred to. For the purpose of distinguishing between the exemplary embodiments the letter a has been added to the reference numerals of the exemplary embodiment in FIGS. 1 to 3. In the exemplary embodiment of FIG. 4 the letter a has been substituted by the letter b.

(34) FIG. 4 in particular shows a metal sheet 36b of a rotary drum unit 14b of a sieving device 10b, in particular in a planar, non-bent state, for an illustration of the arrangement of sieving openings 42b. By way of example and to provide better overview, only one sieving opening 42b was given a reference numeral.

(35) FIG. 4 exemplarily shows respectively two first structure groups 44b, 44b′ and two further structure groups 46b, 46b′.

(36) The sieving openings 42b in the at least one first structure group 44b, 44b′ and the sieving openings 42b in the at least one further structure group 46b, 46b′ have an angular shape, in particular a square shape.

(37) A smallest structure distance 52b is greater than a further intra-distance 50b.

REFERENCE NUMERALS

(38) 10 sieving device 12 housing unit 14 rotary drum unit 16 filling-in channel 18 material to be sieved 20 sieving portion 22 sieving portion 24 longitudinal axis 26 longitudinal axis 28 motor unit 30 cylinder axis 32 suspension axle 34 gear unit 36 metal sheet 38 cylinder frame element 40 rotary impeller unit 42 sieving opening 44 structure group 46 structure group 48 intra-distance 50 intra-distance 52 structure distance 54 structure repetition distance 56 structure repetition distance 58 hexagon group 60 perforation step