DE7824841U1 - SCREEN BASE WITH STRAIGHT AND / OR CORRUGATED WIRE AS SCREEN ELEMENTS - Google Patents

Description

Hein, Lehmann AG, Fichtenetr. 75, 4000 Düsseldorf 1

. 3. August 18, 1978

De / Am

Sieve bottom with straight and / or corrugated wires as sieve elements

The innovation concerns a sieve bottom with straight and / or corrugated wires as sieve elements, which are parallel arranged to form sieve openings between them and to each other via web-like cross connections made of plastic are connected, and with a sieve top and a sieve bottom.

; Sieve bottom with parallel sieve openings between them The sieve elements that form, in particular so-called harp sieve bottoms, are preferred for classifying which are more difficult to sieve Goods, e.g. sticky screenings, pit damp

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7824841 1i1t7l

ter coal or ore are used. Such sieve bottom are on opposite edges with clamping elements, for. B. Fold, provided and thus clamped on a sieve frame or in a sieve machine. Within the Siebrahmens or the sieving machine, the sieve bottom rests on traverses which have an elevation and which are required to support the sieve bottom. The sieve bottom takes, according to the elevation of the crossbeams, a curved shape. This results in a different height of the sieve material layer thickness on the sieve bottom during operation, which leads to an uneven Screening effect leads. The installation and removal of such a sieve bottom is comparatively cumbersome. In addition, the sieve bottoms wear out in the area of the

'5 verses especially.

The innovation is based on the task of designing a sieve bottom of the type mentioned in such a way that it completely flat and in particular can be installed and removed in a simple manner and that he has a long Has service life.

This object is achieved according to the invention in that the cross connections are lengthened on the underside of the sieve are and are thus automatically clamping connectable to a support element of a support structure. the For example, plate-shaped sieve bottom sections can be planned too completely and too large Sieve bottom are assembled and individually or as a whole pushed or pushed onto the support elements. A sufficient hold of the sieve bottom can be through

Adjustment of the geometry of the cross connections and the support elements depending on the hardness of the plastic of the cross-connection. Clamping seams are no longer required. The sieve bottom is not lying more.on a traverse, where there was always a risk of fraying, but is fixed to the supporting elements which at the same time take on a support function, connected. Suitable as plastic for the cross connection thermoplastics in particular.

A secure hold of a sieve bottom according to the innovation while at the same time being easy and simple to replace according to the modular system can be achieved when the cross connections are parallel to each other and with are arranged at the same intervals and in each case in their extended area at least one lateral, longitudinal extension the cross-connections has extending groove in which the associated support element engages.

It is particularly favorable if the cross-connections are composed of an ellipse and a circle in cross section are, the sieve elements are roughly grooved in the ellipse and the transitions from the elliptical Form opposite lateral grooves for the associated support element to the circular area.

The production of the sieve bottom can be simplified if cross wires for the lateral delimitation of the cross connections are introduced in particular in the manner of a chain-weft connection.

Based on the exemplary embodiments shown schematically in the drawings, the innovation is described below explained.

It shows: FIG. 1 a perspective view of a

modern sieve bottom,

FIG. 2 shows a section of this sieve tray according to the invention, installed in a supporting structure, and

FIG. 3 shows a section of a further sieve tray according to the invention, installed in a different supporting structure.

In FIG. 1, a sieve base 1 according to the invention is shown with parallel sieve openings 2 forming between them Sieve elements 3 shown. The sieve elements 3 consist of wires that alternately run straight or wavy are. The wires can have any cross-sectional shape, ζ. B. round, trapezoidal or triangular. Preferred the straight wires are thicker than the corrugated ones. The wires are made of thermoplastic via cross connections 4 Plastic bonded together. The cross-connections 4 are in cross-section from an ellipse and composed of a circle. Ellipse and circle are tangentially connected concave circular arc sections joined together so that opposing grooves running in the longitudinal extension of the transverse connections are given are. The sieve elements 3 traverse the elliptical

Part of the cross-connections approximately in the middle c The area of the cross-connections, which is circular in cross-section, is extended downwards and is free of sieve elements.

In FIG. 2, a perforated plate 1 according to the invention, which is placed on a supporting structure 6, is shown in section shown. The downwardly extended area of the cross connections 4 of the sieve bottom 1 is profiled so that it automatically clamps in an undercut groove of a one-piece support element with a C-shaped cross-section 5 of the supporting structure 6 can be inserted. Such a sieve bottom is easily exchangeable and can be completely be installed flat.

In FIG. 3, a sieve tray 7 according to the invention is shown, which likewise has its downwardly extended area its cross connections 4 is interchangeable and automatically clamped onto a support structure 8. To the lateral delimitation of the cross connections 4, cross wires 9 are provided, which in the manner of a chain - weft connection have been introduced prior to the application of the cross connection. This means that the Cross connections are prevented during their application. At the same time, the transverse wires 9 position the screen elements 3. The support structure 8 has composite support elements 10, 11, which have a spacer sleeve 12 are screwed together.

7124841

Claims (4)

■ ■ · Hein, Lehmann AG, Fichtenstr. 75, 4000 Düsseldorf 1 .1. 18.8.1978 De / Am protection claims 1. Sieve bottom with straight and / or corrugated wires as sieve elements, which form sieve openings arranged in parallel between them and which are connected to one another via web-like cross connections made of plastic, and with a sieve top and a sieve bottom, characterized in that the cross connections (4 ) are extended on the underside of the sieve and thus automatically clamping with a support element (5,10,11) of a support structure ^ 6 _; 8) are connectable. 7824841 14.1171 ;1 2. Sieve tray according to claim 1, characterized in that that the cross connections (4) are arranged parallel to one another and at equal intervals are and each in their extended area at least one lateral, longitudinal extension the cross connections (4) has a running groove into which the associated support element (5,10,11) engages. 3. Sieve tray according to claim 1 or 2, d a d u r ■ :. H characterized in that the cross connections (4) in cross section are composed of an ellipse and a circle, the sieve elements (3) are roughly in the middle of the ellipse and the transitions from the elliptical to the circular Form area opposite lateral grooves for the associated support element. 4. Sieve tray according to one of claims 1 to 3, characterized in that Cross wires (9) for the lateral delimitation of the cross connections (4), in particular in the manner of a chain weft threading are introduced. 7824841 K12.78 J_