EP1088599B1 - Rotary screen element and method for cleaning rotary sceen elements - Google Patents

Abstract

The element is star-shaped and has elastically flexible fingers (2-4), which extend axially and radially. A reinforcement part (7) is arranged at or in at least one finger (3). The reinforcement part is longer in the radial direction than it is in the axial direction. The axial length of the reinforcement part is preferably not longer than the axial length of the finger. An Independent claim is included for a method for cleaning the rotation sift element.

Description

The invention relates to a rotary screen element as well a method for cleaning rotary screen elements.

According to the state of the art (G 93 07 096.9) are screening systems known which for pre-sorting bulk goods, such as compost, bark humus or mulch, peat and so on, but also in building rubble recycling application Find.

These screening systems belonging to the state of the art are constructed in such a way that parallel synchronous drives Shafts rotatably and axially staggered to each other Groups of sieve stars made of molded rubber parts with have resilient fingers. The fingers are lagging in the circumferential direction and as a sickle-shaped Scraper tines formed. The respective distances between neighboring screen stars and screen star rollers adapted to the goods to be sorted.

So that the sieving results have a constant quality and do not wear screen elements prematurely or the system due to thread-like objects or damp or sticky build-up soiled and stopped the system, the sieve elements and their gaps getting cleaned.

Adhesive material must be elaborate and restrict production Devices are removed. This Devices are complex, expensive and not in the long term can be used for effective and effective cleaning. In addition, these must be part of the state of the art Devices of the screening process for the cleaning process be interrupted, which is also a disadvantage.

According to the prior art (DE-AS 1 140 054) is a Roller grate with finger wheels for cleaning crops known. This roller grate on the one hand Cleaning the finger wheels of a fixed rake as well as reinforcement parts on one on every second shaft Finger of the finger wheel on. The reinforcement parts point a larger width than the fingers on to the fingers sideways to clean.

This roller grate, which belongs to the prior art, has the disadvantage that due to the fixed rake long Waste products such as wires, threads, carpet residues and The like is not stripped from the hubs of the sieve elements become. These long-stranded remnants attach themselves to the Hubs firmly, build up and impede the rotation.

In addition, the dirt settles on the rake, which is arranged below the sieve elements.

It also belongs to the state of the art (DE 297 11 724 U1) a scraper for a disc screen or a disc separator. Here too is below the Disk sieve provided a fixed rake that the already mentioned disadvantages.

The technical problem underlying the invention consists of a rotary screen element and a method for cleaning at least two adjacent Specify rotary screen elements and their gaps, with which a continuous cleaning is possible, whereby the cleaning process during the sieving process takes place, and what is simple and is inexpensive, and which of the hubs of the rotary screen elements long-stranded waste products reliably removed.

The fact that the rotary screen element, which as Siebstern is formed in or on at least one finger has a reinforcing part, the radial Extension of the finger is less than the radial Expansion of the reinforcement part, the finger moves along this reinforcement part or the reinforcement part during the sieving process constantly over the bundle of adjacent rotary sieve elements. As a result, no can on the federal government Accumulate dirt or debris so that a constant Cleaning takes place during the actual sieving process.

The reinforcing part according to the invention has a larger one radial expansion as an axial expansion. It is advantageously essentially the crescent shape of the at least trained a finger.

Thereby, that the reinforcement part on the If the finger protrudes, the reinforcement member moves with every revolution over the collar of the adjacent rotary screen element.

According to the invention, the reinforcing part has a larger one Stiffness as the finger of the rotary screen element on.

The rotary screen elements usually consist of Rubber or an elastic plastic.

The reinforcing part made of steel is particularly advantageous wear-free steel, plastic and / or one ceramic material.

The reinforcing part is advantageous on the side of the Fingers arranged, which is in the forward direction.

The finger points to the attachment of the reinforcement part at least one hole. The reinforcing part points also at least one hole, the holes are arranged in such a way that the bores lie one above the other, when the reinforcement part is fully assembled. By one hole each in the finger and the reinforcement part a fastening element is inserted and fastened. Becomes If a rivet is used, it is expanded accordingly. It it is also possible to use bolts or the like.

Usually it is sufficient to put in and in the finger to provide a hole for the reinforcing element, through which the fastener engages.

The hole is advantageous to increase stability in the outer half or in the outer third of the Fingers arranged.

The reinforcing part has at the end which in Direction of the hub of the rotary screen element arranged is, at least one projection on which in a recess a throat adjacent to the finger is arranged.

Since the reinforcement part is advantageously on the side of the Finger is arranged, which is in the forward direction of the finger lies, the finger with the arranged on it If necessary, avoid the reinforcement part during the sieving process should be necessary. The finger is still compliant designed, but has a much higher Stiffness than the other fingers on.

According to a preferred embodiment of the invention is the throat that the finger with the reinforcement part in Trailing direction is arranged adjacent, in a larger Degrees closed than the remaining throats so the Finger becomes even more stable overall. This has the advantage that the reinforcing part with its projection is not enough the recess can slide out, the finger should bend very strongly once.

According to a further embodiment of the invention the reinforcement part arranged in a finger. The reinforcement part is at least partially from the material of the finger.

In this case, the reinforcement part is not after attached to the manufacture of the rotary screen element, but during the manufacturing process of the rotary screen element immediately incorporated into this.

In particular in the embodiment in which the reinforcing part is arranged in the finger, it is advantageous if the reinforcement has openings. In this case will have a better connection with the elastic Rotating sieve element achieved.

If the reinforcing part is in a finger of the rotary screen element arranged, the reinforcing part is advantageous with a hook-shaped or eyelet-shaped Provide end, which in the hub area of the rotary screen element is arranged.

According to the invention, it is sufficient for each rotary screen element a reinforcement part of a screening system provided. However, it is also possible to have one or more Fingers to arrange a reinforcement part.

The fact that adjacent rotary screen elements with different speeds are driven, becomes the collar of an adjacent rotary screen element cleaned with the help of the reinforcement part. For example, if a rotary screen element is 15 Revolutions per minute and the adjacent rotary screen element for example driven at 17 revolutions per minute, the device requires 255 revolutions for the Bund is completely cleaned once.

Through this continuous cleaning process even in the beginning avoided that dirt particles, in particular if the screenings are moist, fix them on the bundle. It also prevents filamentous contaminants, like ropes, nets or the like, on the waistband fix and hinder the sieving process.

The device according to the invention has the advantage that continuous cleaning is possible. The actual The screening process does not have to be interrupted for cleaning.

If the reinforcement parts are arranged on the fingers, This has the advantage that, on the one hand, Screening devices belonging to technology can be retrofitted can. On the other hand, it is possible to wear one or replace several reinforcement parts individually, without having to replace the entire rotary screen element have to.

Further details of the invention can be found in the subclaims be removed.

Fig. 1

ein Rotationssiebelement, teilweise geschnitten;

Fig. 2

ein Verstärkungselement in Draufsicht;

Fig. 3

ein Verstärkungselement in Seitenansicht, teilweise geschnitten;

Fig. 4

die Befestigung eines Verstärkungselementes an einem Finger;

Fig. 5

ein System von drei Rotationssiebelementen in Draufsicht;

Fig. 6

zwei benachbarte Rotationssiebelemente mit in den Fingern angeordneten Verstärkungselementen in Seitenansicht, teilweise geschnitten;

Fig. 7

ein Verstärkungsteil in perspektivischer Darstellung;

Fig. 8

ein geändertes Ausführungsbeispiel;

Fig. 9

ein Verstärkungselement in perspektivischer Darstellung;

Fig. 10

ein Siebsystem.

An exemplary embodiment of the invention is shown in the drawing, namely:

Fig. 1

a rotary screen element, partially cut;

Fig. 2

a reinforcing element in plan view;

Fig. 3

a reinforcing element in side view, partially cut;

Fig. 4

the attachment of a reinforcing element to a finger;

Fig. 5

a system of three rotary screen elements in plan view;

Fig. 6

two adjacent rotary screen elements with reinforcing elements arranged in the fingers in a side view, partially cut;

Fig. 7

a reinforcing part in a perspective view;

Fig. 8

a modified embodiment;

Fig. 9

a reinforcing element in a perspective view;

Fig. 10

a screening system.

Fig. 1 shows a rotary screen element (1) with fingers (2, 3, 4), which are arranged on a hub (5). The Hub (5) has a square recess (6) for the Recording a shaft (not shown).

A reinforcing part (7) is arranged on the finger (3), one with a rivet (8) on the finger (3) is attached. On the other hand, a projection (9) of the Reinforcing part (7) in a recess (10) of the rotary screen element, so two attachment points of the Reinforcement part (7) on the rotary screen element (1) are. The recess (10) is in a throat (11), which is arranged adjacent to the finger (3). The rotary screen element (1) is in the direction of Arrow (A) rotated so that the reinforcing part (7) is in the forward direction of the finger (3).

The throat (12), which is in the wake direction to the Finger (3) is less deep than the rest Fillets (13, 14) of the rotary screen element (1). This increases the stiffness of the finger (3).

Fig. 2 shows the reinforcing part (7), which one Bore (15) and the projection (9). A radial one Extension (c) of the reinforcing part (7) is greater than an axial extent (d).

3, the reinforcing part (7) is angled formed so that the reinforcing part (7) essentially has the shape of the sickle-shaped finger (3).

4 is a hole (16) in the finger (3) arranged. Through the hole (16) of the finger (3) and through the bore (15) of the reinforcing part (7) the rivet (8). The rivet points to the finger (3) (8) a collar (17). The rivet (8) is in the top Area (18) expanded to the reinforcing part (7) the finger (3).

Fig. 5 shows the rotary screen element (1) and others Rotary sieve elements (19, 20). The rotary screen elements (1, 19, 20) are arranged relative to one another in such a way that the fingers (3, 21, 22) interlocking are. In particular, the reinforcing elements (7, 23) bearing fingers (3, 24) have a smaller radial extent than the radial expansion of the reinforcing elements (7, 23). The radial expansion of the reinforcement elements (7, 23) is designed such that it is connected to a collar (25, 26, 27) of the adjacent rotary screen elements (1, 19, 20) bump or nearly bump to avoid sticking Loosen dirt or the like.

Is between the fingers of the rotary screen elements an axial height (a) and between the fingers (21) and the collar (25) of a rotary screen element a gap width (b) is formed. The distances of the axial height (a) and the gap width (b) from each other are for the respective fraction separation selectable and adjustable.

The axial extent (e) of the finger (3) is slight greater than the axial extent of the reinforcing part (7). The radial extent (f) of the finger (3) is smaller than the radial extension of the reinforcing part (7).

6 are two rotary screen elements (28, 29) shown, the reinforcing elements integrated in fingers (30, 31) (32, 33). Because the rotary screen elements (28, 29) with different speeds of rotation turn in the direction of the arrows (B), the collar of the each adjacent rotary screen element continuously cleaned because the reinforcing elements (32, 33) at each Revolution at or near another area of the Come from the neighboring sieve element.

7, the reinforcing element (32) hook-shaped end (34), which according to FIG. 6 in a Hub (35) of the rotary screen element (28) is arranged.

Fig. 8 shows a rotary screen element (36) with a Reinforcing element (37), which is arranged in a finger (45) is.

According to FIG. 9, the reinforcing part (37) has an eyelet shape formed end (38).

10, a sieve (39) is shown. The sieve (39) has shafts (40), on which in turn elastic trained rotary screen elements (41) are arranged.

The rotary screen elements (41) are from shaft to shaft (40) offset and interlock. The sieve elements are by a drive (42) engaging the shafts (40) 43) driven in the same direction. The passage width of the sieve (39) is determined by the distance between them gripping elastic rotary screen elements (41) certainly. The rotary screen elements (41) have reinforcing parts (44) with which the sieve moves during the Screening process cleans itself, since material adheres on the elastic sieve elements (41) during operation is continuously prevented.

reference numerals

1

A rotary screen

2, 3, 4

finger

5

hub

6

recess

7

reinforcing part

8th

rivet

9

head Start

10

recess

11

throat

12

throat

13

throat

14

throat

15

drilling

16

drilling

17

Federation

18

upper area

19, 20

Rotationssiebelemente

21, 22

finger

23

reinforcing part

24

finger

25

Federation

26

Federation

27

Federation

28, 29

Rotationssiebelemente

30, 31

finger

32, 33

reinforcement parts

34

The End

35

hub

36

A rotary screen

37

reinforcing part

38

The End

39

scree

40

waves

41

A rotary screen

42, 43

drive

44

reinforcement parts

45

finger

A, B

arrows

a

axial height

b

gap width

c

radial expansion

d

axial expansion

e

axial extension of the finger

f

radial expansion of the finger

Claims (17)

1. A rotary screen element formed as a screen star, wherein the screen star comprises resilient fingers having a radial extent and an axial extent, characterised in that a reinforcing part (7; 32, 33; 37) is arranged in or on at least one finger (3; 30, 31; 45), the radial extent (c) of the reinforcing part (7; 32, 33; 37) being greater than the axial extent (d) of the reinforcing part (7; 32, 33; 37), and the reinforcing part (7; 32, 33; 37) having a maximum width corresponding to the width of the finger (3; 30, 31; 45), and in that the radial extent (f) of the finger (3; 30, 31; 45) is smaller than the radial extent (c) of the reinforcing part (7; 32, 33; 37).
2. A rotary screen element according to claim 1, characterised in that the maximum axial extent (d) of the reinforcing part (7; 32, 33; 37) corresponds to the axial extent (e) of the finger (3; 30, 31; 45).
3. A rotary screen element according to claim 1, characterised in that the fingers (3; 30, 31; 45) form sickle-shaped stripping prongs lagging in the circumferential direction, the inner mutual spacing of which (axial height (a), gap width (b)) is selectable or adjustable for the separation of fractions.
4. A rotary screen element according to claim 1, characterised in that the at least one reinforcing part (7; 32, 33; 37) is substantially adapted to the sickle shape of the at least one finger (3; 30, 31; 45).
5. A rotary screen element according to claim 1, characterised in that the reinforcing part (7; 32, 33; 37) has greater rigidity than the finger (3; 30, 31; 45).
6. A rotary screen element according to claim 1, characterised in that the reinforcing part (7; 32, 33; 37) comprises steel, plastics and/or a ceramic material.
7. A rotary screen element according to claim 1, characterised in that the rotary screen element (1, 28, 29, 36, 41) comprises rubber or a resilient plastics.
8. A rotary screen element according to claim 1, characterised in that the finger (3) on which the reinforcing part (7) is arranged has at least one bore (16), in that the reinforcing part (7) has at least one corresponding bore (15), and in that a fixing element (8) engages through the at least one bore (16) of the finger (3) and the corresponding bore (15) of the reinforcing part (7).
9. A rotary screen element according to claim 8, characterised in that a rivet (8) is provided as a fixing element.
10. A rotary screen element according to claim 1, characterised in that the reinforcing part (7) has, on one end, at least one projection (9) arranged in a recess (10) of a channel (11) adjacent to the finger (3).
11. A rotary screen element according to claim 1, characterised in that a channel (12), arranged adjacent to the finger (3) in the lagging direction, is less deep than the remaining channels (11, 13, 14) of the rotary screen element (1).
12. A rotary screen element according to claim 1, characterised in that the reinforcing part (7) is arranged on the side of the finger (3) facing in the leading direction.
13. A rotary screen element according to claim 1, characterised in that the reinforcing part (32, 33; 37) is arranged in the finger (30, 31; 45) and is at least partly surrounded by the material of the finger (30, 31; 45).
14. A rotary screen element according to claim 1, characterised in that the reinforcing part has openings.
15. A rotary screen element according to claim 13, characterised in that the reinforcing part (32, 37) has a hooked or looped end (34, 38), and in that this end (34, 38) is arranged in a hub (35) of the rotary screen element (28).
16. A method of cleaning at least two adjacent rotary screen elements having the features according to claim 1, characterised in that the at least one finger (3; 30, 31; 45) with the at least one reinforcing part (7; 32, 33; 37) and/or the reinforcing part (7; 32, 33; 37) moves over a collar (25, 26, 27) of the adjacent rotary screen element and removes adhering dirt or impurities.
17. A method of cleaning rotary screen elements according to claim 16, characterised in that adjacent rotary screen elements have different rotational speeds.

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