EP3523056B1 - Flip-flow screener machine with optimised screen bottom fastening - Google Patents

Description

The invention relates to a flip-flow screening machine with a support frame which is primarily excited by means of a drive and which can be set in vibration, to which an oscillating frame is coupled in a freely oscillating manner by means of elastic transmission elements, which is secondarily excited by the transmission elements of the support frame and set in vibration, wherein on the support frame and on the Oscillating frame crossbeams are arranged, with a crossbeam arranged on the support frame being followed by a crossbeam arranged on the vibrating frame and between two crossbeams a flexible screen lining is arranged and releasably attached to the crossbeams.

Such flip-flow screening machines are known. To enable replacement of worn screen panels, the screen panels are releasably attached to the cross members. From the DE 30 13 737 A1 such a flip-flow screening machine is known in which the screen linings are connected to the crossbeams by means of clamping strips. From the DE 36 21 902 C2 a flip-flow screening machine is known in which the screen panels are fastened to the crossbeams by means of screws.

The disadvantage here is that the use of additional components in the form of the terminal block or in the form of the screws means that there is a high level of assembly work involved. Another disadvantage is that the clamping strip or the screws on the top of the screen lining form unwanted edges on which the material to be screened gets caught.

From the AT 8 742 U1 a flip-flow screening machine is known comprising a first moving system having a first crossbeam and a second Second moving system having crossbeams, the first and second moving systems being arranged to be movable relative to one another and at least one screen mat being provided, which is fastened both to an associated first crossbeam and to an associated second crossbeam in order to allow the screen mats to be compressed and stretched alternately achieve.

From the EP 0 736 336 A1 a screening machine is known with movable crossbeams arranged at right angles to the conveying direction of the screenings and carrying thin, flexible plastic screen mats, with the edges of two screen mats being detachably fastened to one crossbeam, with an area protruding downwards on the underside of the edge of a screen mat, which extends at least two forms protruding profiles below, which are parallel to the edge next to each other at about the same height and have a mushroom-shaped, half-mushroom-shaped and / or hook-shaped cross section.

The object of the invention is to overcome these disadvantages and in particular to simplify the assembly of the screen panels.

According to the invention, this object is achieved by a flip-flow screening machine according to claim 1 . Advantageous developments of the invention are specified in the dependent claims.

Particularly advantageous in the flip-flow screening machine with a support frame that is primarily excited by means of a drive and can be set in vibration, to which a vibrating frame is coupled in a freely swinging manner by means of elastic transmission elements, which is secondarily excited by the transmission elements of the support frame and set to vibrate, wherein on the support frame and on the Oscillating frame crossbeams are arranged, with a crossbeam arranged on the support frame being followed by a crossbeam arranged on the vibrating frame and a flexible screen mesh being arranged between two crossbeams and releasably attached to the crossbeams, it is that the screen meshes each have at least one undercut, by means of which they engage behind an undercut on the crossbeam and directly abut two adjacent screen decks on the face side.

In such flip-flow screening machines, the support frame is made to oscillate by means of a drive. The oscillating frame is fastened to the supporting frame in a freely swinging manner by means of elastic transmission elements. The oscillating frame is also caused to oscillate by the transmission of the oscillations from the primarily excited supporting frame via the transmission elements to the freely oscillating oscillating frame. Arranged on the supporting frame and on the swinging frame are crossbeams, between which screen linings are fastened. The crossbeams of the support frame and the crossbeams of the oscillating frame are each arranged alternately. Due to the relative movement of the oscillating frame in relation to the supporting frame the screen mats attached to the crossbeams, which each extend from one crossbeam to the next crossbeam, are stretched and compressed. As a result, the material to be screened that is applied to the screen lining is greatly accelerated.

Because the screen panels each have at least one undercut, by means of which they engage behind an undercut on the crossbeam, the screen media can be fastened to the crossbeams in a very easy manner. Furthermore, it is particularly advantageous that two adjacent screen decks abut each other directly at the front, so that the gap between the adjacent screen decks is closed and no material to be screened can penetrate into the gap.

The screen linings particularly preferably engage behind the undercut on the crossbeam in a form-fitting manner. By forming such a form fit, a secure attachment of the screen linings to the crossbeams is ensured in a simple manner.

According to the invention, two adjacent screen decks abut each other in an elastically deformed manner at the front. According to the invention, the screen linings are oversized on the front side and two adjacent screen linings therefore abut one another in an elastically deformed manner on the front side. Such an oversize on the end face of the screen linings and the elastic deformation ensure that the gap between the screen linings is sealed towards the top. The upper side of the sieve decks designates that side of the sieve decks that comes into contact with the screenings to be processed.

According to the invention, two adjacent screen decks are elastically deformed at the front and together with the adjacent screen deck they form a transition area that is sealed off at least toward the upper side of the screen deck. The transition area sealed towards the top of the screen decks ensures that the gap between the screen decks is securely sealed even at high accelerations and no screenings can penetrate.

The screen linings can be oversized over the entire height at the end or the end can be beveled to the extent that the oversize at the end increases towards the top in order to seal the gap particularly tightly towards the top through the elastic deformation of the screen linings against one another guarantee.

Preferably two adjacent screen decks inhibit each other. After inserting the screen panels in the crossbeams, in which at least one undercut of the screen media engages behind an undercut on the crossbeam, a mutual inhibition of the screen media can be brought about by a corresponding geometric design of crossbeams and screen media.

Particularly preferably, the screen linings have at least one undercut on the end face, with two adjacent screen linings forming a form fit on the end face. Such a form fit between the screen linings abutting on the front side can further increase the mutual inhibition of the screen linings. In particular, the screen decks can have a sawtooth-shaped configuration on the end face in the side view, which interacts with corresponding counterparts on the opposite screen deck and forms a positive fit.

In a particularly preferred manner, two adjacent screen decks lie in a non-positive manner in a groove of the crossbeam. The fact that two adjacent screen panels lie in a groove of the cross member in a form-fitting and at the same time non-positive manner means that the attachment of the screen panels to the cross members is additionally secured, which increases the stability of the flip-flow screening machine.

In a preferred embodiment, two adjacent screen decks form a downward step in the transport direction of the flip-flow screening machine. With the transport direction of the flip-flow screening machine, the direction of movement of the screenings to be processed on the flip-flow screening machine is from the inflow side meant for the flow of the flip-flow screening machine. The screenings to be processed are fed into the inflow side of the flip-flow screening machine and, after being transported further on the upper side of the screen linings, are discharged via the outflow side of the flip-flow screening machine. For this purpose, the flip-flow screening machine is positioned in such a way that at least the oscillating frame of the flip-flow screening machine has a gradient from the inlet to the outlet. In this case, it is advantageous if two adjacent screen decks form a downward step in the transport direction of the flip-flow screening machine, which contributes to the screening material detaching from the screen decks and being broken at the edge of the step.

In a preferred embodiment, it is provided that the first screen cloth of a pair of successive screen cloths overlaps the screen cloth that follows in the transport direction of the flip-flow screening machine. By reaching over in this way, the gap between the adjacent screen decks is closed, so that penetration and depositing of screenings in the gap between the screen decks is reliably avoided. In particular, the overlapping can take place in such a way that a step pointing downwards in the transport direction of the flip-flow screening machine is formed at the same time.

Figur 1

eine schematische Darstellung der Seitenansicht einer Spannwellensiebmaschine mit der Bewegung der Querträger am Schwingrahmen;

Figur 2

ein Ausführungsbeispiel der Anregung der Querträger am Schwingrahmen;

Figur 3

die Bewegungen des Schwingrahmens und des Tragrahmens;

Figur 4

einen Querträger im Schnitt mit daran befestigten Siebbelägen in einer ersten Ausführungsform;

Figur 5

einen Querträger im Schnitt mit daran befestigten Siebbelägen in einer zweiten Ausführungsform.

Several exemplary embodiments of the invention are shown in the figures and are explained below. Show it:

figure 1

a schematic representation of the side view of a flip-flow screening machine with the movement of the cross beams on the swing frame;

figure 2

an embodiment of the excitation of the cross member on the swing frame;

figure 3

the movements of the swing frame and the supporting frame;

figure 4

a cross-member in section with screen media attached thereto in a first embodiment;

figure 5

a transverse beam in section with screen mats attached thereto in a second embodiment.

Identical components and assemblies are provided with identical reference symbols in the figures. The representations of figures 1 and 2 are purely schematic. figure 1 shows schematically the side view of a flip-flow screening machine with the supporting frame 10, which forms the system I. The system I is primarily excited by means of a drive. The oscillating frame 20 is articulated on the supporting frame 10 in a freely swinging manner via elastic transmission elements. The oscillating frame 20 thus forms the system II. By suspending the oscillating frame 20 on elastic transmission elements, the oscillating frame 20 can oscillate freely in relation to the supporting frame 10 and thus perform relative movements relative to the supporting frame 10 .

A row of first crossbeams 11 are attached to the support frame 10. The crossbeams 21 of the oscillating frame 20 are attached to the swinging frame 20, which is mounted in a freely swinging manner on the support frame 10, between the first crossbeams 11 of the support frame 10. There are thus alternating first crossbeams 11 of the support frame 10 and second crossbeams 21 of the oscillating frame 20 are arranged in the flip-flow screening machine. Arranged between the crossbeams 11, 21 are screen mats 30 which are each fastened to the crossbeams. The attachment of the screen panels 30 to the crossbeams is based on the embodiments according to figures 4 and 5 explained below.

In figure 1 the relative movement of the oscillating frame 20 with respect to the supporting frame 10 is represented by the double file 40 . In the embodiment according to figure 1 is a linear movement of the oscillating frame 20 relative to the support frame 10.

figure 2 shows an exemplary embodiment of the excitation of the movement of the system II with the oscillating frame 20 and the crossbeams 21 attached thereto in a schematic manner. For this purpose, the oscillating frame 20 is as shown in the schematic representation according to FIG figure 2 shown suspended on the support frame 10 in a freely swinging manner. The suspension of the oscillating frame 20 takes place by means of elastic transmission elements in a freely oscillating manner on the support frame 10. In the schematic representation according to FIG figure 2 is again a linear movement of the oscillating frame 20 relative to the support frame 10.

figure 3 shows another embodiment of a flip-flow screening machine. The flip-flow screening machine with the supporting frame 10 and the oscillating frame mounted thereon so as to oscillate freely is set at an angle to the horizontal. The support frame 10 forms the system I. The side view according to the figure 3 Covered oscillating frame forms the system II. This adjustment of the support frame 10 and the oscillating frame at an angle to the horizontal is used to transport the screenings from the inlet 25 to the outlet 26. The transport direction of the screenings on the screen decks 30 along the oscillating frame from the inlet 25 to the outlet 26 is indicated by the arrow 27. The flip-flow screening machine is mounted on foundations 1 by means of coil springs 35 .

The system I is formed by the support frame 10. The support frame 10 is primarily excited, so that the crossbeams 11 fixed to the support frame move in accordance with the ellipse 12. The primary excitation of the support frame 10 takes place by means of two unbalanced shafts, the two unbalanced shafts having different centers of gravity. The inclination of the ellipse 12 relative to the horizontal is selected by the relative positioning of the centers of gravity of the two unbalanced shafts.

The system II, which is formed by the oscillating frame, is coupled to the system I in the form of the supporting frame 10 in a freely oscillating manner by means of the transmission elements. Due to the vibration of the support frame 10, as represented by the ellipses 12, the vibrating frame in Added vibrations, which are represented by the ellipses 22. This means that the crossbeams 21, which are arranged on the oscillating frame, execute a movement corresponding to the ellipses 22. Due to this different movement of the oscillating frame relative to the support frame 10, the screen decks 30 are stretched and compressed, as a result of which the screenings applied to the screen decks 30 are greatly accelerated and thereby processed. The material to be screened is transported in the direction of the transport direction 27 from the inlet 25 to the outlet 26 of the flip-flow screening machine. As figure 3 it can be seen that the main direction of movement of the ellipses 22 is set at an angle relative to the transport direction 27 . The main direction of movement of the ellipses 22 denotes the connecting line between the focal points of the ellipse 22 of movement.

By setting the main direction of the ellipse 22 at an angle relative to the transport direction 27, the acceleration of the material to be screened on the screen linings 30 is extremely increased. As a result, the transport capacity of the material to be screened in the transport direction 27 can be increased, so that the angle of attack of the oscillating frame relative to the horizontal can be reduced compared to conventional screening machines. This reduction in the angle of attack compared to the horizontal reduces the overall height of the flip-flow screening machine.

Two exemplary embodiments of the attachment of the screen panels 30 to the cross members 11, 21 are in figures 4 and 5 shown and explained below.

figure 4 shows a first exemplary embodiment of the screen cloth attachment to a cross member 11. Two adjacent screen cloths 31, 32 abut each other at the front, with the screen cloths 31, 32 being oversized, so that a contact area 33 is created in which the two screen cloths 31, 32 are elastically deformed on one another at the front bump. This elastic deformation of the end faces of the screen linings 31, 32 seals the gap 34 towards the top. This sealing of the gap 34 ensures that no material to be screened lying on the upper side can penetrate into the gap between the two screen mats 31, 32.

The screen linings 31, 32 each have an undercut 36, 37. By means of these undercuts 36, 37, the screen decks 31, 32 engage behind the crossbeam 11. As in figure 4 As can be seen, the screen panels 31, 32 abutting on the front sides inhibit each other in the installation situation and thus mutually secure each other against accidentally slipping out of the screen panels 31, 32 clamped in the crossbeams 11.

The cross member 11 is formed, for example, by an open U-shaped profile and has inwardly directed undercuts, each of the two undercuts of the cross member 11 interacting with an undercut 36, 37 of the two screen panels 31, 32 and forming a form fit.

Due to the fact that the screen linings have an overhang in a height range of 50% in the exemplary embodiment shown, which means that the screen linings 31, 32 abut one another in an elastically deformed manner in the contact area 33, the gap 34 is sealed towards the top. At the same time, the screen linings are clamped against one another by the elastic deformation in the section 33 and thus lie in and clamped in the gap of the crossbeam 11 in a form-fitting as well as a force-fitting manner.

figure 5 shows the section of a further exemplary embodiment of the screen cloth attachment to the crossbeam 11. Once again, the two opposite screen cloths 41, 42 each have an undercut, which forms a form fit with the crossbeam 11 for the purpose of attaching the two screen cloths 41, 42. Furthermore, the screen linings abut one another in an area 43 in such a way that they are elastically deformed against one another and inhibit one another.

The crossbeam 11 is formed by an open U-shaped profile and has inwardly directed undercuts, each of the two undercuts of the crossbeam 11 interacting with an undercut of the two screen linings 31, 32 and forming a form fit.

The transport direction in figure 5 corresponds to the direction in the image plane from left to right. The first screen layer 41 in the direction of transport has an overhang 44 which protrudes beyond the adjacent screen layer 42 in the direction of transport and thereby forms the step 45 directed downwards from left to right in the direction of transport. This breaks up the screenings at the edge of the step and improves removal.

The crossbeams of the support frame and the crossbeams of the oscillating frame are each arranged one behind the other in alternation in the transport direction. Due to the movement of the oscillating frame relative to the supporting frame, the screen linings are alternately stretched and compressed, and the screenings to be processed are thereby accelerated.

Claims (8)

1. Flip-flow screener machine comprising a carrier frame (10) which is primarily excited by means of a drive and can be set in oscillation and to which an oscillating frame (20) is coupled in a freely oscillating manner by means of elastic transmission elements, which oscillating frame can be secondarily excited by the carrier frame (10) by means of the transmission elements and can be set in oscillation, wherein cross-members (11, 21) are arranged on the supporting frame (10) and on the oscillating frame (20), wherein a cross-member (11) arranged on the supporting frame (10) is followed in each case by a cross-member (21) arranged on the oscillating frame (20), and between two cross-members (11, 21) a flexible screen bottom (30, 31, 32, 41, 42) is arranged in each case and is detachably fastened to the cross members (11,21), the screen bottoms (30, 31, 32, 41, 42) in each case having at least one undercut (36, 37) by means of which they engage behind an undercut on the cross-member (11, 21) and in each case fasten two adjacent screen bottoms (30, 31, 32, 41, 42) to the cross members (11, 21) and in each case two adjacent screen bottoms (30, 31, 32, 41, 42) abut directly against one another on the end face, characterised in that the screen bottoms (30, 31, 32, 41, 42) are oversized at the end face and in each case two adjacent screen bottoms (30, 31, 32, 41, 42) abut against one another on the end face in an elastically deformed manner.
2. Flip-flow screener machine according to claim 1, characterised in that the screen bottoms (30, 31, 32, 41, 42) engage positively behind the undercut on the cross-member (11, 21).
3. Flip-flow screener machine according to any one of the preceding claims, characterised in that in each case two adjacent screen bottoms (30, 31, 32, 41, 42), elastically deformed at the end face, form with the adjacent screen bottom (30, 31, 32, 41, 42) a transition region sealed at least towards the upper side of the screen bottoms (30, 31, 32, 41, 42).
4. Flip-flow screener machine according to any one of the preceding claims, characterised in that in each case two adjacent screen bottoms (30, 31, 32, 41, 42) obstruct each other.
5. Flip-flow screener machine according to any one of the preceding claims, characterised in that the screen bottoms (30, 31, 32, 41, 42) have at least one undercut at the end face and in each case two adjacent screen bottoms form a positive fit at the end face.
6. Flip-flow screener machine according to any one of the preceding claims, characterised in that two adjacent screen bottoms (30, 31, 32, 41, 42) are each force-fitted in a groove of the cross-member.
7. Flip-flow screener machine according to any one of the preceding claims, characterised in that in each case two adjacent screen bottoms (30, 31, 32, 41, 42) form a downwardly directed step in the transport direction (27) of the flip-flow screener machine.
8. Flip-flow screener machine according to any one of the previous claims, characterised in that the first screen bottom (41) of a pair of successive screen bottoms (41, 42) overlaps the subsequent screen bottom (42) in the transport direction of the flip-flow screener machine.

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