WO2007060155A1

WO2007060155A1 - Flexible fine screen mat

Info

Publication number: WO2007060155A1
Application number: PCT/EP2006/068704
Authority: WO
Inventors: Franz Anibas; Franz Renner; Hermann Fritz
Original assignee: Binder + Co Ag
Priority date: 2005-11-24
Filing date: 2006-11-21
Publication date: 2007-05-31
Also published as: RU2428264C2; AT8742U1; RU2008119321A; PL1957210T3; EP1957210A1; AU2006316485C1; AU2006316485A1; ES2553460T3; AU2006316485B2; EP1957210B1

Abstract

Flip-flop screening jig comprising a first moved system, having a first transverse member (2), and a second moved system, having a second transverse member (4), wherein the first and second moved systems are arranged movably in relation to each other and at least one screening mat (5) is provided, fastened both to an assigned first transverse member and to an assigned second transverse member, in order to achieve alternating compressing and stretching of the screen mats (5). In order to ensure the durability of the fine screen mats in spite of a whiplash effect, it is provided that the screen mat (5) is formed as a fine screen mat produced from plastic woven fabric and is connected to a first transverse member (2) and/or a second transverse member (4) in each case by means of at least one joining element (6, 7, 8), which has a greater elongation at break than the fine screen mat (5) produced from plastic woven fabric.

Description

FLEXIBLE FINE SCATTER

FIELD OF THE INVENTION

The present invention relates to a chip-wave screening machine comprising a first moving system having a first cross member and a second moving system having a second cross member, wherein first and second moving systems are arranged to be movable relative to each other and at least one screen mat is provided on both an associated first cross member as well as to an associated second cross member to achieve an alternating upsetting and stretching of the screen mats, according to the preamble of claim 1, and to a screen mat unit for a Spannwellensiebmaschine with a screen mat and one for attachment to a cross member of a moving system of Spannwellensiebmaschine provided, arranged in the edge region clamping element, according to the preamble of claim 12th

Spannwellensiebmaschinen are already known. They are used both in the coarse grain and in the fine grain range and are characterized by compression and expansion of the screen mats, which has the consequence that the formation of the plug grain opposite

Screening machines with stationary screen mats is much lower.

STATE OF THE ART

Conventional screening mats are in most cases made of polyurethane, wherein the screen openings are produced by punching. These screen mats produced in a conventional manner are characterized by robustness and Durability from, both criteria that are crucial for use in Spannwellensiebmaschinen because alternating stresses and strains of the Siebmatten arise, which adversely affect the durability of the materials used.

However, the punching of the screen openings is a time-consuming and cost-intensive process, which requires a high production time for a screen mat. In addition, the diameter of the screen openings during punching technology can not be reduced arbitrarily or in other words, there is a limit to the dimensions of the screen openings, from which the punching of the same is no longer possible, both as regards the technology as such and as regards the economy , In practice, this limit is at a mesh size of about 1 mm for square screen openings and about 0.4 mm x 4 mm for slot-shaped screen openings.

However, practice shows that there is sufficient need for screening machines for extremely fine-grained screenings, which so far in the field of Spannwellensiebmaschinen due to the mentioned technological difficulties, no adequate solution has been found to cover these needs accordingly.

From other screen areas, but not in Spannwellensiebmaschinenbereich, it is known to provide wire mesh screen mesh. Such a screen mat is known for example from DE 38 11 641 Al. Although these screen mats allow the production of very small screen openings, but their use in a Spannwellensiebmaschine material is not possible because of occurring in a Spannwellensiebmaschine, alternating upsetting and stretching of the screen mats in screen mats Wire mesh is not possible or leads in a short time to breakage.

For particularly fine-grained sieved material, it is known from other sieve areas to use fine sieve mats made of synthetic fabric, for example polyamide fabric. These fine mesh mats offer due to their production as a fabric, in contrast to the stamped polyurethane solution, the possibility of particularly fine-meshed design of the screen mats, which also involves a much larger, open screen surface, which causes among other things, a small size of equipped with such Feinsiebmatten screening machines.

The problem with fine mesh mats made of plastic fabric, however, is their insufficient elongation at break for use in tension wave screening machines, so far such plastic fabrics have not been used in tension wave screening machines. As already mentioned, the screening mats are alternately compressed and stretched at Spannwellensiebmaschinen to avoid mating grain, wherein at each compression operation following expansion sieve mats are overstretched so that the whip effect occurring almost completely prevents the plugging and clogged sieve openings exposed.

In the case of conventional screen mats made of polyurethane, which are used in tension wave screening machines, this occurring whip effect is unproblematic insofar as polyurethane has an elongation at break of about 400%. The term elongation at break is a term used in elastomers, which in other materials is referred to as breaking elongation and indicates by how many percent a material can stretch before it breaks. Due to the high elongation at break, the polyurethane mesh mats have as insensitive to the exposed during use in Spannwellensiebmaschinen whip effect.

The fabric used in other Siebmaschinenbereichen as screen mats fabric made of plastic, but has only an elongation at break of about 30% - 40%, which rupture when using such screen mats in Spannwellensiebmaschinen and the resulting overstretching of the screening mats or when the whip effect such Siebmatten would.

Dispensing with the use of the whip effect would, however, drastically reduce the screening performance due to increased occurrence of plug-in grain and require service lives within which the plug-in grain has to be manually removed from the wire.

PRESENTATION OF THE INVENTION

It is therefore an object of the present invention to prevent this disadvantage and to improve known Spannwellensiebmaschinen so that they can be used for extremely fine-grained screenings.

It is a further object of the invention to adapt tension wave screening machines so that the use of fine mesh plastic mats is possible without destroying these screen mats or without reducing their durability to practically unacceptable levels.

This is achieved by the characterizing features of claim 1 according to the invention.

It is envisaged that in known per se

Chipwellensiebmaschinen comprising a first cross member having first moving system and a second transverse system having second moving system, wherein first and second moving system are arranged to be movable relative to each other and at least one screen mat is provided, which is attached to both an associated first cross member and to an associated second cross member, to alternately compressing and stretching the screen mats to achieve, the screen mat is formed as a fabric made of plastic fabric Feinsiebmatte and is connected via at least one connecting element with the associated first cross member and / or the associated second cross member, which has a, compared to the fabric made of plastic fabric Feinsiebmatte, greater elongation at break.

Due to the already mentioned low elongation at break of the plastic fabric compared to the stamped polyurethane mesh mats is dampened by placing one or more elastic connection elements between Feinsiebmatte and first or second moving system or between Feinsiebmatte and associated first cross member or associated second cross member whiplash effect, without however, its screen opening to prevent cleaning effect. Important here is the exact matching of the material of the connection element or the elongation at break of the material (for example, on the modulus of elasticity) of the connection element. This must be chosen so that the jerking load is not too strongly attenuated during alternating upsetting and stretching of the Feinsiebmatten and so the occurrence of the whiplash effect is prevented, whereby a cleaning of mating grain does not take place. On the other hand, the material must not be chosen so that there is an excessive swinging of the Feinsiebmatten. According to a preferred embodiment of the invention as described in claim 2 is provided that the at least one attachment element is a spring element, for example, a conventional coil spring could be used, which moved the Feinsiebmatte on the first moving system, such as a screen box or on the second System, such as a swing frame, mounted on the respective cross member.

According to a further preferred embodiment of the invention as described in claim 3, it is provided that the connection element is a clamping element made of plastic, which is fastened to the associated first cross member and / or the associated second cross member and in which the Feinsiebmatte is poured. This variant is characterized by particular robustness.

A further preferred embodiment of the invention according to claim 4 provides as a connection element before a plastic bed which is cast in a receptacle of a fastened to the associated first cross member and / or the associated second cross member clamping element. In this plastic bed turn the Feinsiebmatte is poured. The clamping element may well be made of a harder material in this case and not have the required for the present application in a Spannwellensiebmaschine Elongation or elasticity, since the whip effect damping element in this embodiment is the plastic bed formed in the clamping element, in which the Feinsiebmatte is poured. The attachment of Feinsiebmatte in plastic bed can be done for example by casting the Feinsiebmatten in plastic or for example by vulcanization or sticking. According to the characterizing features of claim 5, the receptacles are slot-shaped, whereby a particularly simple fastening of the fine mesh mats in the receptacle or in the plastic bed therein is possible.

According to a further preferred embodiment as described in claim 6, it is provided that the connection element and the fine mesh mat form an exchangeable screening mat unit. This makes it possible to prefabricate such a screen mat unit already and to fix on the Spannwellensiebmaschine on site, for example, clamp. In particular, in the case of an intended clamping element whose training may already have a corresponding with the mounting options, in particular the cross member, on the Spannwellensiebmaschine shape, so that a rapid yet secure attachment of Siebmatteneinheit to the tensioning shaft machine is possible.

According to another preferred embodiment variant of the invention as provided in claim 7, the connection element is a preferably separate separate elastic element attached to the associated first cross member or associated second cross member. In this case, the Feinsiebmatte made of plastic fabric can be attached directly to the associated first cross member or associated second cross member.

In such a case fastening means are provided according to claim 8, which connect the elastic element on the one hand with the Feinsiebmatte and on the other hand with the associated first cross member and the associated second cross member.

According to a further preferred embodiment of the invention as described in claim 9, it is provided that at least one of the two consisting of warp and weft thread groups of the Feinsiebmatte forming plastic fabric to the Cross beams diagonally, ie. neither parallel nor perpendicular thereto, is arranged to run. In this way it is achieved that the plastic fabric in the compression or expansion direction of the chipwashing machine has a higher elongation at break or elasticity than would be the case without inclination. As a result, the connection element can be made somewhat stiffer without the risk that the fine mesh mat of plastic fabric tears.

In a particular embodiment according to claim 10 it is provided that the Feinsiebmatte made of plastic fabric itself acts as a connection element and the required elongation at break for use of Feinsiebmatte in Spannwellensiebmaschinen done by appropriate skewing of warp and weft with respect to the cross member. In this case, an additional attachment element for attaching the Feinsiebmatte to the cross members is no longer required and the Feinsiebmatten plastic fabric can be attached to the cross members in a conventional manner.

According to the characterizing features of claim 11, the mesh size of the fine mesh mats made of plastic fabric is less than 2mm x 2mm with square screen openings or 2mm x Xmm in slot openings (X = greater than 2mm).

The claims 12 to 15 relate to a screening mat unit for a Spannwellensiebmaschine with a

Sieve mat and one intended for attachment to a cross member of a moving system of Spannwellensiebmaschine, in

Clamping element arranged edge region, wherein according to the invention it is provided that the screen surface is formed as a Feinsiebmatte made of plastic fabric and the clamping element comprises a connection element, which has a greater elongation at break compared to Feinsiebmatte having. The immediate arrangement of serving as a damping element for the whip attachment element on the screen mat made of plastic fabric, allows the use of fine mesh mats made of plastic fabric with correspondingly small mesh size of Spannwellensiebmaschinen, wherein connecting element and Feinsiebmatte form a replaceable unit that facilitates replacement of the entire Siebmatteneinheit on the Spannwellensiebmaschine ,

According to a preferred embodiment of the invention as described in claim 13, the clamping element itself, which establishes the connection between Feinsiebmatte and the respective cross members, designed as a connection element with greater elongation at break.

According to another preferred embodiment as described in claim 14, the clamping element has a, preferably slot-shaped, receptacle with a plastic bed, which serves as a connection element for the Feinsiebmatte made of plastic fabric and with which the Feinsiebmatte is connected, for example by pouring.

BRIEF DESCRIPTION OF THE FIGURES

Following is now a detailed description of the invention with reference to an embodiment. It shows

Fig.l an axonometric view of a Spannwellensiebmaschine

2 is a schematic side view of an existing screen mat and connecting element Siebmatteneinheit with spring element 3 is a schematic side view of an existing screen mat and connecting element Siebmatteneinheit with clamping element and plastic bed

4 shows a schematic side view of an existing screen mat and connecting element Siebmatteneinheit with clamping element without plastic bed

5 shows a schematic side view of a screen mat unit in attached to cross members state

6 shows a plan view of a screening mat unit

7 shows an alternative embodiment of a clamping element

8 shows a schematic side view of a screening mat unit in a state fastened to cross members

9 is a schematic side view of a screen mat in attached to a cross member state with a separate connection element

10 is a plan view of a screen mat unit with inclined shot or chain

11 is a plan view of a screen mat unit with inclined shot and chain

WAYS FOR CARRYING OUT THE INVENTION

Fig.l shows a preferred type of tensioning ^¬ screen machine 1 with a Siebwangen 3a, 3b having Siebkasten 3 as the first moving system which is supported on springs 15 against a fixed surface and a Sieve box 3 vibrated drive 16, which may be performed, for example, as a simple or Doppelunwuchtantrieb. The screen cheeks 3a, 3b are connected to each other via a plurality of mutually parallel first cross member forming Siebkastenquerträger 2 together.

On the sieve box 3 is a second moving system, in the present case designed as a swing frame, which on the wire cheeks 3a, 3b and arranged on bars 18 mounted push rods 17 includes. The storage of the push rods 17 via elastic elements, such as rubber blocks or spring elements (both not shown), so that the fundamental vibration of the sieve box 3 stimulates the swing frame to another, amplitude-excited oscillation.

The push rods 17 are connected to each other via parallel to each other and parallel to the Siebkastenquerträgern 2 arranged second cross member forming swing frame ^¬ cross member 4.

The screen surfaces are constructed by individual screen mats 5, which are alternately attached to a swing frame cross member 4 and a Siebkastenquerträger 2.

The operation of the Spannwellensiebmaschine is as follows: the swing frame is also amplified by the unbalanced by means of vibrating 16 vibrated screen box 3 vibrated. Due to the elastic mounting of the push rods 17 of the swing frame on the screen box 3 results in a fundamental vibration of the screen box 3 offset vibration of the swing frame. The screen mats 5 are alternately compressed and stretched or overstretched, whereby not only the screening of the screenings is accomplished, but also the formation of pinch is prevented. This in turn causes an optimal screening effect.

The present embodiment shows a screening device with a screen plane. It goes without saying that the arrangement of several layers of sieves one above the other is possible and also common in tension wave screening machines. In this case, either a plurality of push rods 17 are elastically mounted on the screen box 3, or more, extending in different planes swing frame cross member 4 on a push rod 17th

The present oscillating system can also be made in banana design with continuously decreasing screen deck inclination.

In order to be able to use tension wave screening machines also in the fine grain range, it is now provided according to the invention that at least one of the screen mats is designed as a fine mesh mat 5 made of synthetic fabric which has at least one attachment element 6, 7, 8 with an associated swing frame cross member 4 and / or an associated screen box cross member 2 is connected, which connecting element 6,7,8 a, compared to the made of plastic fabric Feinsiebmatte 5, greater elongation at break.

It is generally to distinguish between two different execution principles, namely on the one hand that principle in which the Feinsiebmatte forms an interchangeable Siebmatteneinheit with the connection element. In this embodiment principle, the connection element and the fine mesh mat, preferably inseparable, are connected to one another. The second embodiment principle provides that the whip effect damping connection element on a corresponding Siebkastenquerträger 2 or

Oscillating frame cross member 4 arranged element whose elongation at break is inventively greater than that of the Feinsiebmatte.

FIGS. 2, 3 and 4 each show exemplary embodiments which operate according to the first embodiment.

2 shows the schematic representation of a Feinsiebmatte 5 which is connected via a spring element 6 with a known clamping element 12, to which no further requirements are made than that it must be fastened to a cross member 2.4 of one of the two moving systems ,

3 shows a screening mat unit with a fine mesh mat 5 and a clamping element 10, which has a slot-like receptacle 11. In the slot-like receptacle 11 is a plastic bed 7, which is cast into the receptacle or otherwise secured therein. The ends of the plastic mesh fabric are embedded in the plastic bed 7. The clamping element 10 may in this case also be made of a material having a lower elongation at break, since the plastic bed 7 is present as a damping, elastic element with a corresponding elongation at break, which contributes to the fact that the occurring whip effect does not lead to the destruction of the plastic fabric of the fine mesh mat.

4 shows a further embodiment of the first embodiment. In this case, a clamping element 8 is cast directly with the Feinsiebmatte 5 and forms the connection element. In this embodiment, it is therefore necessary that the clamping element has the required elongation at break, which according to the invention must be higher than the elongation at break of the Feinsiebmatte 5 forming plastic fabric.

In FIGS. 2 to 4, the clamping elements 8, 10, 12 each have a special shape, which enables them to be securely and quickly clamped to the screen box cross members 2 or swing frame cross members 4, as shown in FIG. The clamping elements 8,10,12 have for this purpose a corresponding recess 19, with which they are plugged onto the Siebkastenquerträgern 2 and swing frame cross members 4. To spread the Einspannelemente 8,10,12 on the Siebkastenquerträgern 2 or swing frame cross members 4, for example, one or more bolts 25 or a bar 25 is provided so that the clamping elements 8,10,12 are immovably fixed to the Siebkastenquerträgern 2 or swing frame cross members 4.

The clamping elements as shown in FIGS. 2 to 4 are a possible embodiment variant. Of course, other embodiments are possible, which allow a secure attachment of Siebmatteneinheiten to the Siebkastenquerträgern 2 or swing frame cross members 4.

Such an alternative embodiment of a clamping element, for example, Fig.7. The screen mat unit consisting of Feinsiebmatte 5 and clamping element 20, wherein the clamping element 20 has a different shape than shown in Figures 3 and 4, however, is identical to the structure, ie. either a receptacle with a plastic bed 7, in which the connection element is cast or even forms the connection element and is made correspondingly elastic. However, the clamping element 20 is in contrast to the clamping elements 8,10 of 2, 3 formed flat. For fixation on the Siebkastenquerträgern 2 or swing frame cross members 4 is used in this case, a fastening means 14, for example a screw, as can be seen from Figure 8.

6 shows a fine mesh mat 5 according to the invention made of synthetic fabric, as shown in FIGS. 2 to 5 and FIGS. 7 and 8, in a plan view. The clamping element 8,10, with which the attachment to the Siebkastenquerträgern 2 or Schwingrahmenquerträgern 4 takes place, extending in the longitudinal direction of the Feinsiebmatte along the edge region thereof.

9 shows a variant according to the second embodiment. In this case, the connection element 13 is fixed as a preferably separate element on a screen box cross member 2 or swing frame cross member 4 via a fastening means 14, for example a screw. The fastening ^¬ means 14 also serves for direct fixing of the Feinsiebmatte 5, which in this case, no clamping is required to have at Siebkastenquerträger 2 or swing frame crossbeams 4 is also a means of clamping between a clamping element 21 and 13, the connecting element In this way achieved very elastic connection of Feinsiebfläche of plastic fabric to the Siebkastenquerträger 2 or swing frame cross member 4.

10 and 11 show a plan view of a fine mesh mat 5 made of plastic fabric according to another preferred embodiment of the invention. For orientation, the Siebkastenquerträger 2 or swing frame cross member 4 are indicated schematically. The thread group of the fabric forming the chain 23 is, as can be seen in FIG. 10, inclined to the direction of the sieve 24 instead of parallel. In a further embodiment according to FIG. 11, the thread group forming the weft 22 is additionally arranged obliquely to the screen box cross members 2 or swing frame cross members 4. Due to the oblique arrangement, a higher elasticity of the plastic fabric is achieved in the sieve direction 24 and thus the elongation at break is increased. The chucking elements 8, 10 shown in FIGS. 10 and 11 are no longer necessary when the thread groups are sufficiently inclined, so that in this special case the plastic fabric itself forms the connecting element. In such a case, no additional, elastic connection element for connecting the fine mesh mat made of synthetic fabric to the Siebkastenquerträger 2 or swing frame cross member 4 more is required.

However, a combination of such Feinsiebmatten with inclined shot 22 and / or chain 23 with Einspannelementen 8.10 as shown in Figure 3 and 4 and with spring elements 6 as shown in Figure 2, take place.

Claims

PATENT APPLICATIONS

A tension wave screening machine comprising a first moving system comprising first cross beam (2) and a second moving system comprising a second cross beam (4), wherein first and second moving systems are movably arranged relative to each other and at least one screen mat (5) is provided an associated first cross member and is attached to an associated second cross member to achieve an alternating compression and stretching of the screen mats (5), characterized in that the screen mat (5) is designed as a fabric made of plastic fabric Feinsiebmatte and at least one in each case Connecting element (6,7,8) with the associated first cross member (2) and / or the associated second cross member (4) is connected, which has a, compared to the made of plastic fabric Feinsiebmatte (5), greater elongation at break.

2. Chipwellensiebmaschine according to claim 1, characterized in that the connection element is a spring element (6).

3. Spannwellensiebmaschine (1) according to claim 1, characterized in that the connecting element is a clamping element (8) made of plastic, which on the associated second cross member (4) and / or the associated first cross member (2) can be fastened and in which the Fine mesh mat (5) is cast.

4. Spannwellensiebmaschine (1) according to claim 1, characterized in that the connecting element in a receptacle (11) one of the associated first cross member (2) and / or the associated second Cross member (4) attachable clamping element (10) cast plastic bed (7), in which the Feinsiebmatte (5) is cast.

5. Spannwellensiebmaschine (1) according to claim 4, characterized in that the receptacle (11) is slot-shaped.

6. Spannwellensiebmaschine according to any one of claims 1 to 5, characterized in that the connecting element (6,7,8) and Feinsiebmatte form an exchangeable Siebmatteneinheit.

7. Chipwellensiebmaschine (1) according to claim 1, characterized in that the connecting element is a on the associated second cross member (4) or first cross member (2) arranged, preferably separate elastic element (13).

8. Chipwellensiebmaschine (1) according to claim 7, characterized in that fastening means (14) are provided, which the elastic element (13) on the one hand with the Feinsiebmatte (5) and on the other hand with the associated first cross member (2) or the associated second Connect cross member (4).

9. Spannwellensiebmaschine according to one of claims 1 to 8, characterized in that at least one of the two chain (23) and weft (22) existing thread groups of the screen mat (5) forming plastic fabric arranged obliquely to the cross members or to the conveying direction 24 is.

10. Chipwellensiebmaschine according to claim 1, characterized in that the connecting element is the screen mat (5) itself and at least one of the two from chain (23) and weft (22) existing thread groups of the screen mat (5) forming plastic fabric to the cross members (2,4) is arranged obliquely.

11. Chipwellensiebmaschine according to any one of claims 1 to 10, characterized in that the mesh size of the Feinsiebmatten (5) is less than 2 mm.

12. screening mat unit for a Spannwellensiebmaschine (1) with a screen mat (5) and one for attachment to a cross member (2) of a moving system of the Spannwellensiebmaschine (1) provided in the edge region arranged clamping element (8,10), characterized in that the Screen surface is designed as a fine mesh made of plastic mesh (5) and the clamping element (8,10) comprises a connecting element (7,8) having a greater compared to the Feinsiebmatte (5) elongation at break.

13. screening mat unit according to claim 12, characterized in that the clamping element (8) itself is designed as a connection element (8).

14. screening mat unit according to claim 12, characterized in that the clamping element (10) has a, preferably slot-shaped, receptacle (11) with a plastic bed (7) as a connecting element, with which the Feinsiebmatte (5) connected, preferably encapsulated.

15. screening mat unit according to one of claims 11 to 14, characterized in that the mesh size of the fine mesh (5) is less than 2 mm.