DE8906721U1 - Equipment for screening bulk materials that are difficult to screen - Google Patents

Description

TURBA Torfindustrie GmbH Munich, 08.05.1989

Industrial area Neu St. Jürgen P 1735/89

D-2862 Worpswede 1 Pu/rei

Device for screening bulk materials that are difficult to screen 10

The invention relates to a screening device for bulk materials that are difficult to screen, with a feed device for the screened material, a screen bottom that is operatively connected to a drive, consisting of a plurality of disk-shaped elements that are rotatably mounted on shafts arranged parallel to one another and arranged in a meshing manner.

. conveyor elements, the mutual distances between which determine the size of the openings of the sieve bottom, as well as with a

Waste disposal device. 25

Such a device for screening wood chips is known from DE 28 46 941 Al. There, the sieve bottom is made of

a plurality of discs, which are arranged on sieve diameter 30

direction of travel, in trough-like formation arranged shafts with the same or, to produce different screen fractions, at different distances and driven in such a direction of rotation that their sections facing the passage form a

I · · ·

have a circumferential movement that gives the material lying on the sieve bottom a circulating movement across and along the one

I side or both sides of the passage upwards under

simultaneous movement through the passage in the direction of the exit.

;■: For bulk materials consisting of particles adhering to one another or with

): IO

k lubricating components, as is particularly the case with fresh

;.: As is the case with cut peats, such screening devices cannot be used, since the circumferential movement imposed on the material to be screened by the discs forming the screen bottom S _1K creates a compaction effect similar to that of a conveyor screw, which negates any screening effect.

U 20 It is also known that in such screening devices for T wood chips the shafts carrying the discs are arranged transversely to the

Direction of flow of the screening material; see DE 28 10 359

To prevent elongated pieces of wood from being caught between the meshing discs by tilting movements

the discs of the individual disc rows must be

hün rotate with different peripheral speeds, which can be caused by different sizes of the discs or, in the case of equally sized discs, by different speeds of the

Disc-bearing shafts are achieved, whether

Experience has shown that such a device is not well suited for screening peat, bark mulch and similar bulk materials, since the openings between the discs are blocked relatively quickly by the smearing screening material.

It is also known that between the individual panes 10

a roller grate of a cleaning machine for field crops constructed similarly to the above-mentioned screening devices cleaning scraper; vyl. DE 27 51 562 A1.

However, such cleaning scrapers are not suitable for sieve bottoms of the type in question here, since the sieving character of the sieve bottom arrangement is lost.

The invention is based on the object of developing the screening device mentioned at the beginning in such a way that it can also be used for screening peat, bark mulch and similarly difficult bulk materials while simultaneously simplifying its mechanical design.

This object is achieved according to the invention in that the 30

Sieve bottom consists of several parts arranged in stages one behind the other with different opening sizes that the shafts carrying the conveyor elements

arranged transversely to the conveying direction of the screening material, that 35

the intermeshing parts of the conveyor elements are star-shaped

designed arms, that the conveyor elements of each sieve plate are synchronously connected to one another, but with different drive connections from one sieve plate to another, through which all conveyor elements can be moved in the same direction of rotation, which determines the direction of flow of the sieved material, and that the flow direction of the sieved material

fines obtained from different sieve fractions IO

determining conveyor chutes are provided.

Further features of the invention emerge from the subclaims.

Such a screening device works very effectively even with difficult screening material and reliably over long periods of operation, since the conveyor elements are designed as rotating hard rubber stars, through which the screening material applied via the chute is moved in the direction of the discharge device and is thereby crushed. In this case, the screening material falls into the respective partial screen bottoms in accordance with the gap size between the meshing hard rubber stars of the partial screen bottoms, separated into screening fractions.

while the residue moves forward to the dispenser 30

The arms of the hard rubber stars sliding past each other can clean themselves automatically due to the free spaces between the individual arms of a hard rubber star, so that sticking or smearing of the

Sieve bottoms are effectively prevented. Since the hard rubber stars and their associated spacers are

Since the sieve plates are designed to be simply clipped onto the shafts that support them, the sieve device can be easily adapted to the properties of the individual types of bulk materials by exchanging the hard metal stars and the spacers and by adjusting the respective speed of the shafts, so that good sieving results are always achieved.

can be achieved. By exchanging the IO

uiSuänZStüCke &ugr; θ &Ggr; the yeyeüS5itiy9n distance and thus the hole size of the rollers determining the parts and the bottoms can be changed easily and reliably.

The invention is described below with reference to a drawing

described in the embodiment shown. Shown are:

Figure 1: a plan view of part of the

Screening device in enlarged view;

Figure 2: a section through the screening device according to the invention from the side

seen;
30

Figure 3: a view of a disc-shaped conveyor member which is part of the sieve bottom 6 sieve device according to Figures 1 and 2.

* *««·««* 44 44

.-' «If·*·« 14 9*

^ 4»4**9**&Oacgr;**&Lgr;*

Figure 4: on an enlarged scale a partial view of the screening device according to Figures 1 and 2 seen from the drive side, and

Figure 5: a side view of an IO assigned to the conveyor elements according to Figure 3

spacer.

A screening device, designated in Figures 1 and 2 as a whole with the reference number ,_, comprises a side wall 11

b

and 12 limited trough-shaped conveyor troughs 1? of approximately U-shaped cross-section, one closed end of which is assigned an inlet chute 14 and the other open end of which is assigned a conveyor chute. The floor above the conveyor trough is formed by a stepped sieve bottom 17, which consists of three partial sieve bottoms 17-1, 17-2 and 17-3, which partially overlap one another between the closed and open ends of the conveyor trough.

^AJ are arranged overlapping and in stages one below the other; see Figure 2.

The partial sieve bottoms 17-1 and 17-3 are provided with additional ground chutes 30

18 and 19, via the individual sieve fractions SFI and SF3, which pass through the partial sieve bottoms 17-1 and 17-3, to collecting containers. The partial sieve bottom 17-2

passing sieve fraction SF2 reaches directly+, i.e. ohi-.e a 35

Conveyor chute, by gravity into the assigned collecting

•&igr; rtt • t ·

container. The residue RS passes via the conveyor chute 16 into the associated collecting container.

The screening device 10 is surrounded by a

Frame construction 20 which rests on feet 21 on the floor 22.

The individual parts of the sieve floor consist, in particular, of

Figures 2 to 5 show a plurality of intermeshing conveyor elements 23, which are carried by shafts 25 arranged parallel to one another transversely to the conveying direction of the screening material - i.e. perpendicular to the plane of the drawing in Figure 2 - and are arranged parallel to one another in such a way that the conveyor elements 23 have a lateral and an axial spaced apart from one another in order to form sieve openings 24 through which parts of the sieved material can pass; see in particular Figure 1. The individual conveyor members 23 have, as shown in Figure 3, star-shaped arms 26 which are sickle-shaped

are bent against the direction of rotation given to them, while their hubs 27 have square openings 28 in cross-section.

The shafts 25 carrying the conveyor elements also have

a corresponding square cross-section, so that by simply lining up the conveyor links 23 with the

are to be connected to the respective associated shaft 25. 35

••»••II · · ·

The shafts 25 are rotatably supported with their ends on the side walls 11 and 12 by means of bearing blocks 29 in a manner known per se. Cuboid-shaped spacers 30 inserted between the individual bearing blocks 29 determine the mutual distance between the shafts 25' and thus the axial distance between the conveyor elements 23. The

Bearing blocks 29 together with their spacers in their illustrated 10

ten position.

The lateral distance of the conveyor elements 23 can also

, _e by replaceable, also disc-shaped, &iacgr;&ogr;

spacers 34 each provided with a square opening 33 can be determined - see Figure 5 - which can be inserted between two conveyor members 23.

By inserting the above-mentioned spacers 30 and 34, the lateral and axial distances of the conveyor members 23 and thus the size of the sieve openings 24 of the partial sieve bottoms 17-1, 17-2 and 17-3 can be easily determined and changed. The arrangement is such that within

of each partial sieve bottom the size of the sieve opening is equal to 30

, but becomes larger from part sieve bottom to part sieve bottom.

The shafts 25 are connected to each other by in Figure 4 only

indicated gears 38 connected to each other; 36

the gear 38 is driven by a controllable drive 39 with adjustable speeds.

•&igr; ··· it ti y** ·»

The gears are designed in a known manner so that the shafts of each partial sieve plate have the same speed, but different speeds from partial sieve plate to partial sieve plate, with the lowest number of revolutions being assigned to partial sieve plate 17-1 with the smallest sieve openings and the highest number of revolutions being assigned to partial sieve plate 17-3 with the largest sieve openings.

The screening material fed into the filling chute 14 falls onto the partial screen bottom 17-1 and is conveyed by its conveyor elements 23 and moved in the direction of arrow 40 to the following sieve bottom 17-2. In this case, the sieve fraction SF1 corresponding to the size of the sieve openings 2-s present there passes through the sieve bottom onto the conveyor chute 18 and reaches into the associated collecting container AB1.

In the same way, the screening material reaching the area of the partial screen bottom 17-2 is torn open by the conveyor belts present there and conveyed in the direction of arrow 40 to the

next partial sieve bottom 17-3. The sieve fraction corresponding to the size of the sieve openings 24

SF2 falls through the sieve openings mentioned and 30

falls directly into the assigned collecting container AB2.

The same happens with the screening material that was conveyed to the partial screen bottom 17-3; the associated screen fraction SF3 falls onto the conveyor chute 19 and from there into the associated collecting container AB3.

It ·I IfIl It I

♦ * * lltll

20

25

30

35

The remaining residue ¹ l of screening material passes through the conveyor chute 16 into the associated collecting container AB4. Although the above description relates to a preferred embodiment of the invention, changes to the individual components are possible, provided that they correspond in the same or equivalent manner to the described classification of bulk materials of the type in question here.

10

S- type serve.

15

Protective equipment:

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Claims (5)

II ···· »»■ I • » # ♦■ · •V.1· .-· TURBA Torfindustrie GmbH Munich, 08.05.1989 Industriegebiet Neu St. Jürgen P 1735/89 D-2862 Worpswede 1 Pu/rei Protection claims 1. Screening device for bulk materials that are difficult to screen, with a feed device for the material to be screened, a screen bottom that is operatively connected to a drive, consisting of from a variety of rotatable on parallel to each other &igr;&ogr; arranged shafts, arranged in meshing fashion, disk-shaped conveyor elements, the mutual distances of which determine the size of the openings of the sieve bottom, as well as with a discharge device for the residue, characterized in that the sieve bottom (17) consists of several, (17-1, 17-2, 17-3) with different opening sizes (25) = that the shafts (25) carrying the conveyor elements (23) are arranged transversely to the conveying direction (arrow direction 40) of the screening material, that the meshing parts of the conveyor elements (23) star-shaped designed arms (26) are such that the conveying elements (23) of each partial sieve bottom (17-1, 17-2, 17-3) move among each other in a synchronous manner, from partial sieve bottom to partial sieve bottom 35 but in different drive configurations connection (38) through which all conveyor members (23) can be moved in the same direction of rotation, which determines the direction of flow (arrow direction 40) of the screening material, and that conveyor chutes (18, 19) are provided which determine the flow direction of the fine material of different screening fractions (SF1, SF2, SF3) obtained from the screening material. 2. Screening device according to claim 1, characterized in that &pgr;&rgr; k &rgr;&eegr;&eegr; - characterized in that the sieve bottom (17) consists of three partial sieve bottoms (17-1, 17-2, 17-3) arranged one behind the other in a step-like manner. 3. Screening device according to claims 1 and 2, characterized in that the conveyor members (23) supporting shafts (25) can be changed in their center distances by means of exchangeable spacers (30) inserted between the bearing blocks (29) supporting the shafts. 4. Screening device according to claims 1 to 3, characterized in that the drive (39) is connected via controllable gears (38) to the shafts (25) of the individual Partial sieve bottoms (17-1, 17-2, 17-3) of the sieve bottom (17) in 30 Active compound «teht. it · * t 5. Screening device according to claim 1, characterized in that the conveyor members (23) consist of hard rubber and have central openings (28) of square cross-section, that the conveyor members are assigned disk-shaped spacers (34), which also have central openings (33) of square cross-section cross-section, and that the conveyor members (23) 10 can be plugged onto the associated shafts (25) which also have a square cross-section, either alone or alternately with spacers (34) inserted between them.