DE102017106930B4 - Sieve device - Google Patents

Abstract

Sieve device (1) with a sieve frame (3) spanning a sieve surface (2), at least two sound conductors (4-6) and a vibration exciter (7) to set the sound conductors (4-6) vibrating, the sound conductors (4 -6) are coupled to the vibration exciter (7) via a vibration transmitter (10). The vibration transmitter (10) comprises a resonator rod (11) to which both sound conductors (4-6) are directly coupled.

Description

The present invention relates to a sieve device with a sieve frame spanning a sieve surface and at least two sound conductors and a vibration exciter, the vibration exciter causing the sound conductors to vibrate. For this purpose, the sound conductors are coupled to the vibration exciter via a vibration transmitter.

A wide variety of screening devices have become known in the prior art. For the same area of application, for example, the DE 44 18 175 C5 a device and a method for sieving, classifying, sifting, filtering or sorting of substances have become known, a sieve surface provided in a sieve frame and an associated ultrasonic transducer being provided. Vibrations can be fed to the screen surface through the ultrasonic transducer. The ultrasonic transducer is assigned at least one resonator, which rests on the screen surface and which is matched to the resonance of the ultrasonic transducer and can be caused to oscillate by the latter, in particular bending oscillations. In this case, at least one concentric ring-shaped rod resonator is provided in a circular frame, which is connected to the frame by decoupling plates. The decoupling plates are preferably fixed in a node of the movement. This known device allows sound to be distributed over the active screen mesh, with a large-area screen mesh also being able to distribute several resonators over the screen mesh. In this device, it is considered to be disadvantageous that the tuning of the resonator is associated with a great deal of effort and can practically only be implemented for a few simple resonator geometries. A similar arrangement is provided by the DE 20 2014 103 239 U1 disclosed. A central cylindrical drive transmits the vibrations to a fastening ring through radially arranged sound conductors. The point-like excitation is suitable for small sieve areas.

With the DE 10 2006 047 591 A , which is a subsequent registration of the DE 10 2006 037 638 A1 is, in turn, a further device for sieving, classifying, filtering or sorting dry solid substances or solid substances in liquids with at least one ultrasonic converter and with at least one sound conductor and at least one sieve frame has become known for the same area of application, with a non-resonant excited outside of vibration nodes Sound conductor or sieve frame connecting elements are attached to at least one sieve frame or sound conductor, which are suitable for passing on vibration excitation of the sound conductor or sieve frame to the sieve frame or sound conductor. In the known device, a feed line resonator is arranged between the ultrasonic converter and the sound conductor, the feed line resonator being suitable for the excitation of bending vibrations or for the excitation of longitudinal vibrations. Such a device also enables the construction of a sieve device with several sound conductors in order to set a larger sieve surface in vibration.

The disadvantage of the known devices, however, is that there is still a considerable inequality of the vibration excitation over a larger screen area with several sound conductors. In particular, sound conductors arranged further away from the vibration exciter receive less oscillation power, as a result of which only less oscillation energy is applied to the screen mesh in the area of the more distant sound conductor. One solution to this problem is to use several vibration exciters, one vibration exciter in each case exciting a sound conductor in order to set a certain area of the screen surface in vibration. This improves the homogeneity of the transmission of vibrational energy, since more distant sound conductors can be dispensed with. Disadvantages of this, however, are the outlay on equipment and also the considerably greater outlay on control, which results in higher costs.

It is therefore the object of the present invention to provide a sieve device which enables a more homogeneous distribution of the vibrations on the sieve surface with less effort.

This object is achieved by a sieve device with the features of claim 1. Preferred developments of the sieve device according to the invention are the subject of the subclaims. Further advantages of the present invention result from the general description and the description of the exemplary embodiments.

A sieve device according to the invention has at least one sieve surface which is spanned by a sieve frame. Furthermore, at least two sound conductors and a vibration exciter are provided in order to set the sound conductors in vibration. The sound conductors are coupled to the vibration exciter via a vibration transmitter. The vibration transmitter comprises a resonator rod to which the two sound conductors are (in particular directly) coupled directly.

The screening device according to the invention has many advantages. A significant advantage of the screening device according to the invention is that two or more sound conductors can be set in vibration with only one vibration exciter, with both sound conductors are coupled to the resonator rod of the vibration contract.

In the prior art, a vibration transmitter consists of several resonator bars. If, for example, a circular screen frame with two (or more) concentrically arranged sound conductor rings is used in a known screening device, a vibration transmitter z. B. radially from the outside to transmit the vibration to the exterior of the two sound conductor rings. For this purpose, an outer resonator rod is used which is welded to the outside of the two sound conductor rings on the outside thereof. An inner resonator rod is welded onto the inside of the outer sound conductor ring, which is welded to the outer side of the inner sound conductor ring. As a result, in this known system, the vibration was transmitted radially from the outside from the vibration exciter via the outer resonator rod (the weld seam) to the outer sound conductor ring and from there (via the inner weld seam and) via the inner resonator rod again via the weld seam to the inner sound conductor ring. It has been found that these welded joints, which are very stiff and strong, transmit or even absorb a considerable part of the vibration energy in a phase-shifted manner. In any case, such a system of several resonator rods, weld seams and sound conductor rings transmits the excited oscillation frequency to more distant sound conductors only to a considerably weaker extent, or at least not without loss.

In the present invention, in contrast, the oscillation of the resonator rod is now transmitted practically directly from the resonator rod to both sound conductors. This avoids a different number of material transitions. So it is not necessary to transfer the vibration power for the most distant sound conductor over several welds and sound conductor rings, but the vibration energy is transferred from the resonator rod directly to one sound conductor and the other sound conductor (and possibly further sound conductors).

In a preferred embodiment, the sieve device comprises a sieve frame and an at least partially provided sieve surface, the sieve frame being provided and designed to be covered with a sieve fabric, the sieve frame being assigned a vibration exciter and the vibration exciter being connected to a plurality of sound conductors is. The vibration exciter is coupled to preferably at least two sound conductor rings via a continuous vibration transmitter.

In preferred embodiments, the resonator rod is solid. It is also possible for the resonator rod to be hollow.

The resonator rod can be designed as a polygonal rod, rectangular rod or preferably also as a round rod. It is also possible for the resonator rod to have an O-, T-, X-, L-, V- or U-shaped or elliptical or other suitable cross section. In particular, the cross section of the resonator rod is adapted to the vibration frequency to be transmitted or the vibration frequency range to be transmitted.

In preferred developments, the resonator rod is connected to the sound conductors in a form-fitting and / or force-fitting manner (firmly). In particularly preferred developments, the resonator rod is connected to the sound conductors in both a form-fitting and a force-fitting manner.

In advantageous developments, the sound conductor is welded, soldered or glued to the resonator rod. It is particularly preferred that the resonator rod has at least one recess for the form-fitting reception of a sound conductor. A sound conductor on the resonator rod that is received in this way in a recess in a form-fitting manner allows particularly efficient transmission of vibrations to the sound conductor. In particular, the sound conductor is pressed into the recess.

In a particularly preferred development, the recess is formed in an upper part of the resonator rod and serves to receive a lower part of a sound conductor in a form-fitting manner. Under "below" and "above" are to be understood here the directions in the intended assembly and in the intended use. It is also possible, however, for the recess to be formed in a lower part of the resonator rod and to serve to receive an upper part of a sound conductor in a form-fitting manner.

Embodiments are preferred in which the recesses are provided in an upper part of the resonator rod, since these embodiments open up the simple possibility that the resonator rod is partly arranged below the sound conductor. This is a structurally simpler embodiment, since the sieve fabric to which the sound conductors transmit the vibration is typically arranged directly above the sound conductor.

In all of the configurations it is also possible that the recess is formed in a right or left part of the resonator rod and a part of the sound conductor is accommodated therein in a form-fitting manner in an analogous manner to that in the resonator rod to transmit acting vibrations reliably and efficiently to the sound conductor and in particular the sound conductor. It is also possible that a z. B. designed as a ring sound conductor has a downward protrusion to which the resonator rod (from below, the side or an upper surface) is coupled. The extension is in particular formed in one piece with the rest of the sound conductor or can be designed as a separate part and firmly connected to the sound conductor and z. B. be welded. If all sound conductors are connected to the resonator rod in the same way, the desired uniform excitation of all sound conductors is achieved.

In all configurations, it is possible to designate the vibration transmitter as a feed line resonator.

The resonator rod preferably has two or more cutouts for the form-fitting reception of a sound conductor. In the case of sound conductors formed in a spiral shape, it is also possible for the resonator rod to have two or more recesses for a single sound conductor.

In preferred developments, the resonator rod passes through the screen frame without contact. For this purpose, a through opening is preferably formed on the screen frame, through which the resonator rod is guided through without contact. This results in a decoupling of the resonator rod from the screen frame, so that a particularly efficient transmission of the vibrations to the screen fabric is possible.

In other configurations, it is also possible for the resonator rod to be guided to the sound conductors below the screen frame. Then a through opening is not necessary.

In all of the configurations, the resonator rod is preferably arranged in the area of the sound conductors in a plane that is offset in height from a plane of the passage opening or a middle plane of the sieve frame. This means that the resonator rod does not extend completely within a plane parallel to the plane of the sieve fabric and / or the plane of the sieve frame, but that part of the resonator rod preferably extends in a first plane and a further part of the resonator rod in a second and to it staggered level extends. This enables a small screen device. The construction volume is used optimally. The screen frame does not have to be made higher than necessary. The supply of the vibrations via the resonator rod can take place at the level of the sieve frame and through the sieve frame, while the resonator rod is preferably somewhat lower in the area of the sound conductor and is coupled there to the sound conductors. Or the vibrations are fed in below the sieve frame. The resonator rod is preferably bent twice (in particular in opposite directions) between the screen frame and a first sound conductor. The two bends are particularly preferably designed in such a way that the resonator rod is located in the area of the passage through the screen frame and in the area of the sound conductor in two planes arranged offset in height. If the resonator rod is arranged below the sieve frame and does not pass through the sieve frame, the resonator rod is preferably also deflected twice, the resonator rod then preferably being arranged lower in the area of the sieve frame than in the area of the sieve surface.

In all configurations, it is preferred that at least one sound conductor is designed as a closed sound conductor ring. Such a sound conductor ring can have a rectangular or elliptical or circular shape or some other shape. Preference is given to rectangular shapes or rectangular shapes with rounded corners or also circular shapes. Such a configuration allows a homogeneous distribution of the vibration energy on the screen surface.

A sound conductor can have a polygonal and in particular approximately rectangular cross section in all configurations. It is also possible that the sound conductor has a T-, X-, L- or U-shaped or elliptical cross section. In preferred embodiments, the different sound conductors have (essentially) the same cross section.

At least one sound conductor is particularly preferably designed as a hollow profile.

At least one sound conductor is preferably connected to another sound conductor and / or the screen frame via at least one connecting element and in particular a plurality of connecting elements. The connecting elements can preferably be fixed in a node of the movement. The connecting elements can also be used to transmit vibration energy to the screen frame.

The screen frame is preferably covered with at least one screen fabric. It is preferred that the screen fabric is glued to at least one sound conductor and / or the screen frame. The screen fabric can comprise two or more fabric layers.

In all of the configurations, it is particularly preferred that the vibration exciter comprises at least one ultrasonic converter or as a an ultrasonic converter is designed. In particular, the ultrasonic converter has a (working) frequency between 10 kHz and 50 kHz. The ultrasonic converter preferably has a frequency of 10-40 kHz and preferably between 20 and 40 kHz.

It is preferred that the ultrasonic converter has (at least) a frequency between 30 kHz and 40 kHz. The frequency can preferably be changed during operation, so that, in particular, frequencies that change periodically are possible during operation.

The vibration exciter is advantageously attached outside the screen surface.

In other preferred embodiments, the vibration exciter (or at least one vibration exciter) is attached within the screen surface and preferably above the screen surface. It is also possible that the vibration exciter is attached below the screen surface. In particular, the vibration exciter is arranged in such configurations within a projection perpendicular to the screen surface.

In preferred further developments of all configurations, at least one second vibration exciter and an associated second resonator rod are provided. A second vibration exciter and an associated second resonator rod (in particular geometrically) are preferably arranged opposite the first system (vibration exciter + resonator rod). With even more systems an even distribution z. B. preferred over the circumference.

In further refinements and developments, the type of vibration excitation and the application of the vibrations to the screen fabric can take place, as shown in FIG DE 10 2006 037 638 A1 and / or the DE 44 18 175 C5 is revealed.

Further advantages of the present invention emerge from the exemplary embodiments which are explained below with reference to the accompanying figures.

• 1 eine leicht perspektivische Draufsicht auf eine erfindungsgemäße Siebeinrichtung;
• 2 einen schematischen Teilquerschnitt durch die Siebeinrichtung gemäß 1;
• 3 ein vergrößertes Detail aus 1;
• 4 eine Draufsicht auf ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Siebeinrichtung;
• 5 einen schematischen Querschnitt durch den Schwingungsübertrager der Siebeinrichtung gemäß 4; und
• 6 eine Draufsicht auf noch ein Ausführungsbeispiel einer erfindungsgemäßen Siebeinrichtung.

In the figures show:

• 1 a slightly perspective top view of a sieve device according to the invention;
• 2 a schematic partial cross section through the screening device according to 1 ;
• 3 an enlarged detail 1 ;
• 4th a plan view of a further embodiment of a screening device according to the invention;
• 5 a schematic cross section through the vibration transmitter of the screening device according to 4th ; and
• 6th a plan view of yet another embodiment of a screening device according to the invention.

The screening device according to the invention 1 that are in the 1 to 3 is shown has a sieve surface 2 on a sieve frame 3 on that with a sieve mesh 8th is covered. From the sieve mesh 8th For the sake of clarity (as in the other exemplary embodiments), only a maximum of only a small section is shown schematically here.

In the roughly circular sieve frame here 3 the sieve device 1 are concentric to each other three here also circular sound conductors 4th , 5 and 6th arranged via a vibration transmitter 10 through the only in 3 recognizable vibration exciter 7th be set in vibration.

The vibration transmitter 10 includes a resonator rod 11 that passes through the sieve frame without contact 3 at the recording 29 is carried out and that directly with the sound conductors 4th , 5 and 6th connected is.

The resonator rod 11 is made in one piece here and is direct and immediate with the sound conductors 4th , 5 and 6th connected so that the vibration energy generated by the vibration exciter 7th into the resonator rod 11 is introduced, each directly from the resonator rod 11 on the respective sound conductor 4th , 5 and 6th is transmitted. In contrast to the prior art, there is no transmission from one resonator rod to a sound conductor and from there back to the next resonator rod, etc., but the vibrations are transmitted directly from the resonator rod to all sound conductors.

In all embodiments and configurations, however, it is also conceivable to use two resonator rods, a first resonator rod transmitting the vibrations from the vibration exciter to a first surface of a first sound conductor (e.g. radially outside). From a second surface of the first sound conductor (e.g. the inside of the first sound conductor or the opposite outside), the vibrations are then transmitted to all further sound conductors via the second resonator rod. Such a configuration also ensures that all sound conductors are excited homogeneously, even if the use of the two separate resonator rods means that the overall energy input is not quite as high as with a single one.

The individual sound conductors are via connecting elements 22nd and 23 with each other and / or with the frame 3 connected. The connecting elements extend 22nd between the outer sound conductor 4th and the sieve frame 3 . The fasteners 23 each extend between the sound conductors 4th and 5 or. 5 and 6th .

About the fasteners 22nd and 23 can - depending on requirements and structural design - a decoupling of the vibrations from the sound conductors and the screen frame 3 respectively. If necessary, the screen frame can also be used 3 be set in vibration.

As in 1 and 3 recognizable is the resonator rod 11 about the holder 28 with the sieve frame 3 connected in such a way that an oscillation in the longitudinal direction of the resonator rod is made possible, while the resonator rod is held in a defined manner transversely to the longitudinal extension.

2 shows a radial partial cross-section through the sieve device 1 out 1 , the screen mesh 8th above the sound conductor 4th , 5 and 6th and the screen frame 3 extends. The sound conductor 4th , 5 and 6th are designed here as circular sound conductor rings and each have the cross section of a hollow rod. The cross section of the sound conductor 4th , 5 and 6th is approximately rectangular, the rectangle having an elongated shape and extending longer in the vertical direction transversely to the resonator rod than in the direction of the resonator rod.

The resonator rod 11 , which is essentially the vibration transmitter 10 forms, has three recesses here 13 on where the sound conductor 4th , 5 and 6th are each included. Preferably the recesses are 13 form-fitting, so that the sound conductor 4th , 5 and 6th are particularly preferably pressed into the recesses. To improve the sound transmission even further, weld seams are preferred 25th provided with which the sound conductor 4th , 5 and 6th each with the rod material of the resonator rod 11 are welded.

The recesses are preferably located in the upper part 14th of the resonator rod 11 and here (approximately) in the upper half of the resonator rod 11 . The sound conductors are accordingly 4th , 5 and 6th each with its lower part 15th in the recesses 13 recorded.

It is also conceivable that the recesses are formed in the lower part of the resonator rod and that an upper part or part of the sound conductor is received therein.

The resonator rod 11 has in cross section according to 2 two bends 20th and 21st on that for a parallel offset of the two longitudinal sections of the resonator rod 11 to care. In the area of the passage opening 9 through the sieve frame ( 3 ) is the resonator rod 11 in the plane 19th arranged while the resonator rod 11 in the area of the sound conductor 4th to 6th in one plane 18th extends, which is offset in height to the plane 19th is. The height offset is such that the sound conductor 4th to 6th from below in the recesses 13 of the resonator rod 11 are included. The height offset is here between 1/5 and 2/3 the height of a sound conductor and in particular approximately half the height (+/- 10%) of the height of the resonator rod 11 . A supply below the sieve frame is also possible, in which case there is also a (reverse) height offset regularly.

3 shows a detail 1 in a plan view, the area of the through opening 9 for the resonator rod 11 shown in a horizontal cross-section. The resonator rod 11 passes through the passage opening 9 contactless and is made by the holder 28 held, the holder 28 Vibrations in the longitudinal direction of the resonator rod 11 not or only very little dampening.

The vibration exciter 7th who is in 3 is only shown schematically as a black box dashed, can be on the recording 29 installed and transmits the generated vibrations to the vibration transmitter 10 or the resonator rod 11 , the one here as a round bar 12 is formed and consists of solid material.

The resonator rod 11 consists preferably of metal and in particular of steel and preferably also high-alloy steel (stainless steel).

The sound conductor 4th to 6th are preferably also made of metal and in particular of a light metal such as an aluminum alloy or of other light metals. In the specific example, a hollow profile made of stainless steel is used.

4th shows a further embodiment of a screening device according to the invention, in which the connection of the sound conductor 4th to 6th to the resonator rod 11 of the vibration transmitter 10 is realized differently than in the embodiment according to FIG 1 to 3 .

The basic design of the screening device 1 according to 4th corresponds to the design of the screening device according to 1 . Here, too, is the sieve device 1 overall approximately circular and has three concentric sound conductors 4th to 6th which are arranged concentrically to one another and as sound conductor rings 24 are trained. The respective sound conductor 4th to 6th are about fasteners 22nd and 23 each with the sieve frame 3 or connected to the other sound conductors.

In addition, in 4th a cross-shaped stabilization 27 shown, which extends below the sieve surface and to stabilize the sieve frame 3 serves.

The vibration transmitter, which is also made in one piece here 10 or the resonator rod 11 of the vibration transmitter in turn extends in one piece and without contact through the screen frame 3 and is tight with the sound conductors 4th , 5 and 6th coupled.

5 shows a schematic radial cross section through the resonator rod 11 in the design according to 4th .

In the embodiment shown, the resonator rod 11 in contrast to the embodiment according to 1 to 3 no recesses 13 on. In contrast to this are the respective sound conductors 4th to 6th with one implementation 26th provided in the form of a through opening or a bore through which the resonator rod 11 is carried out. For a fixed connection of the sound conductor 4th to 6th with the resonator rod 11 become the sound conductors 4th to 6th at the appropriate position with the resonator rod 11 via (here preferably) weld seams on both sides 25th connected. This also results in a firm coupling of the sound conductors 4th to 6th with the resonator rod 11 . Here too are the sound conductors 4th to 6th each immediately and directly with the resonator rod 11 coupled, so that a performance-reducing coupling of the distant sound conductor 5 or 6th is avoided.

6th shows a schematic plan view of a further embodiment of a sieve device according to the invention 1 , here a rectangular screen frame 3 is used on which two also more rectangular sound conductors 4th and 5 are provided. It is also possible for three or more sound conductors to be provided one inside the other or one behind the other.

The sound conductor 4th and 5 are about fasteners 22nd with the frame 3 connected. To stimulate the sound conductor 4th and 5 a vibration transmitter is used 10 , here again a one-piece and continuous resonator rod 11 includes, which extends from the outside through the through opening 9 extends and the vibrations to the sound conductor 4th and 5 transmits.

The one-piece resonator rod 11 through bushings 26th on the sound conductor 4th and on the sound conductor 5 to the rear end of the sound conductor 5 extend as it is basically 5 shows. The sound conductor 4th and 5 can also use a connection type as in 2 with the resonator rod 11 be connected.

The sound conductors 4th and 5 only at the front (rear) ends with the resonator rod 11 be connected, as indicated by the solid (dashed) arrows with reference numerals 25th in 6th is shown, or it will be the sound conductor 4th and 5 via welds 25th and / or recesses 13 at the front and rear ends of a sound conductor 4th and 5 with the resonator rod 11 connected.

Screening devices with a diameter or a length of up to 2650 mm or even 2900 mm or 4000 mm and more can be made available in all configurations. Such sieve devices enable particularly effective processing of, for example, metal powders, colored powders, fine minerals, bronze powders or aluminum powders, quartz sand and other particles with a size of up to 500 μm or 1000 μm or finer.

A screening device according to the invention enables a more homogeneous power distribution and a greater power input, which can be 10% or 20% or even more locally.

For connecting the resonator rod 11 with the sound conductors 4th to 6th etc., in addition to or instead of a form fit, welding, screwing, gluing, soldering, pressing or another joining process can also be used.

In all configurations it is possible for the screen fabric to be glued to the frame. However, it is also possible that the screen mesh only rests on the frame and only with the sound conductors 4th to 6th is glued.

At least one frequency in the range from 30 to 38 kHz is preferably used as the excitation frequency. It is also possible to use two or more parallel excitation frequencies (frequency ranges) or two or more different excitation frequencies in succession.

The invention has great advantages especially in the explosion-protected area of application. A better sieving result and a better distribution of the products to be sieved are achieved. A longer service life can also be achieved. One of the reasons for this is that the vibration power is introduced more homogeneously. A more even distribution of the energy (ultrasonic energy) is achieved and thus fewer hotspots arise, which is particularly advantageous in explosion-protected areas of application.

List of reference symbols

1

Sieve device

2

Sieve area

3

Screen frame

4th

Sound conductor

5

Sound conductor

6th

Sound conductor

7th

Vibration exciter

8th

Screen mesh

9

Through opening

10

Vibration transmitter

11

Resonator rod

12

Round bar

13

Recess

14th

upper part of 11

15th

lower part of 4

18th

level

19th

Level of 9

20th

Bend

21st

Bend

22nd

Connecting element

23

Connecting element

24

Sound conductor ring

25th

Weld

26th

execution

27

stabilization

28

Holder of 11

29

admission

30th

Ultrasonic converter

Claims (24)

Sieve device (1) with a sieve frame (3) spanning a sieve surface (2), at least two sound conductors (4-6) and a vibration exciter (7) to set the sound conductors (4-6) in vibration, the sound conductors (4 -6) are coupled to the vibration exciter (7) via a vibration transmitter (10), characterized in that the vibration transmitter (10) comprises a resonator rod (11) to which the two sound conductors (4-6) are directly coupled. Sieve device according to the preceding claim, wherein the resonator rod (11) is solid (or hollow). Sieve device according to Claim 1 , wherein the resonator rod (11) is hollow. Sieve device according to one of the preceding claims, wherein the resonator rod (11) is designed as a polygonal rod, rectangular rod or as a round rod (12), the resonator rod (11) preferably being a 0-, T-, X-, L-, U- or V. -shaped cross-section. Sieve device according to one of the preceding claims, wherein the resonator rod (11) is connected to the sound conductors (4-6) in a form-fitting and / or force-fitting manner. Sieve device according to one of the preceding claims, wherein at least one sound conductor (4-6) is welded or soldered or glued to the resonator rod (11). Sieve device according to one of the two preceding claims, wherein the resonator rod (11) has at least one recess (13) for receiving a sound conductor (4-6) in a form-fitting manner. Sieve device according to the preceding claim, wherein the recess (13) is formed in an upper part (14) of the resonator rod (11) and wherein a lower part (15) of a sound conductor (4-6) is positively received therein, or wherein the recess (13) is formed in a lower part of the resonator rod (11) and wherein an upper part of a sound conductor (4-6) is received therein. Sieve device according to one of the two preceding claims, wherein the resonator rod (11) has two or more recesses (13) for positively receiving a sound conductor (4-6). Sieve device according to one of the preceding claims, wherein the resonator rod (11) passes through the sieve frame (3) without contact at a through opening (9). Sieve device according to one of the preceding claims, wherein the resonator rod (11) is guided below the sieve frame (3) to the sound conductors (4-6). Sieve device according to the preceding claim, wherein the resonator rod (11) extends in the region of the sound conductors (4-6) in a plane (18) which is arranged offset in height to a plane (19) of the through opening (9). Sieve device according to the preceding claim, wherein the resonator rod (11) is bent twice between the sieve frame (3) and a first sound conductor (4). Sieve device according to one of the preceding claims, wherein at least one sound conductor (4-6) is designed as a closed sound conductor ring (24). Sieve device according to the preceding claim, wherein the sound conductor ring (24) has a rectangular or elliptical shape or a circular shape and / or wherein the sound conductor (4-6) is polygonal or rectangular or T-, X-, L- or O-shaped or Has a U-shaped or elliptical cross-section. Sieve device according to one of the preceding claims, wherein at least one sound conductor (4-6) is designed as a hollow profile. Sieve device according to one of the preceding claims, wherein at least one sound conductor (4) is connected to another sound conductor (5) and / or the sieve frame (3) via connecting elements (22, 23). Sieve device according to one of the preceding claims, wherein the sieve frame (3) is covered with a sieve fabric (8). Sieve device according to the preceding claim, wherein the sieve fabric (8) is glued to at least one sound conductor (4-6) and / or the sieve frame (3). Sieve device according to one of the two preceding claims, wherein the sieve fabric (8) comprises two or more fabric layers. Sieving device according to one of the preceding claims, wherein the vibration exciter (7) comprises at least one ultrasonic converter (30) and wherein the ultrasonic converter (30) preferably has a frequency between 10 kHz and 50 kHz. Sieve device according to one of the preceding claims, wherein the sieve frame (3) has a through opening (9) for the vibration transmitter (10) and wherein the vibration exciter (7) is attached outside the sieve surface (2). Sieve device according to one of the preceding Claims 1 to 21st , wherein the vibration exciter (7) is attached within the sieve surface (2) and preferably above the sieve surface (2). Sieve device according to one of the preceding claims, at least one second vibration exciter and an associated second resonator rod being provided.

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