EP2558215B1 - Multi-deck air jigging machine - Google Patents

Description

The invention relates to an air drying machine for dry processing of raw materials, especially coal, with a material feeding device, with at least one opening provided with Setzgutträger and with a discharge for the layered during the setting process on the Setzgutträger heavy goods and light goods, wherein for loosening and Stratification of the discontinued on the Setzgutträger material acting as a setting bed heavy layer and an underlying Leichtgutschicht the Setzgutträger from a via the Setzgutträger arranged air stream supplied air flow is flowed through as working air, consisting of a Setzgutträger constantly flowing through partial flow and a pulsating above Partial flow composed.

An airnet machine with the aforementioned features is for example in the DE 20 2005 007 472 U1 described. The example designed as a perforated plate or consisting of wire mesh single Setzgutträger the material to be processed is placed on a material application device. Via an air funnel, which is arranged below the setting material carrier, an air stream is supplied, which consists of a sub-stream which constantly flows through the setting material carrier and a pulsating sub-stream which superimposes the constant sub-stream. By applying the Setzgutträgers and lying on it reprocessing material with the constant air flow is a Grundfluidisierung of on the Setzgutträger achieved lying material, so that a certain permanent loosening of the material is set, which initially has a relatively lower pressure drop in the vertical flow with working air ago Setzgutträger ago. Thus, with regard to the superimposed pulsed air flow, a comparatively lower volume flow of pulse air is required in order to periodically raise and lower the material bed lying on the setting material carrier as part of the process control inherent in a setting machine and thereby bring about the stratification of the material into a heavy material layer and into a layer of light material lying thereon , The working air flowing through the setting material carrier is detected above the setting bed in a housing enclosing the setting material carrier and passed as exhaust air via a filter system.

An airnet machine with the same structure also results from the CN 2 889 496 Y ,

With the known Luftsetzmaschine the disadvantage of a limited capacity is connected, since the surface of the Setzgutträgers is not arbitrarily increased.

From the EP 0 318 054 A1 Although it is known to arrange several Setzgutträger in a Luftsetzmaschine one above the other, but they are not the capacity increase, but are intended to improve the separation success, as far as a transfer of the heavier components of the discontinued on the upper Setzgutträger material flow is adjusted to the downstream Setzgutträger.

A wet-setting machine with an increased capacity is in the DE-A-172 178 described. When using a pulsating water flow operated setting machine are two Setzgutträger arranged one above the other, which are traversed by the located in a below the lower Setzgutträgers setting barrel and offset in a pulsating motion water. The lower Setzgutträger is pierced by a pipe section connected to the setting barrel, so that the stroke of the pulsating water can be transferred to the upper Setzgutträger. Furthermore, the upper Setzgutträger is pierced by a pipe socket to compensate for excess water buoyancy can.

The object of the invention is also to design an air-laying machine with the features of the generic type such that its treatment capacity is increased.

The solution to this problem arises, including advantageous refinements and developments of the invention from the content of the claims, which are adjusted to this description.

The basic idea of the invention is that above the air funnel connected to an air supply line connected to a pulse valve which is switched on there are at least two juxtaposed with each other at a distance from each other and successively flowed through by the air stream introduced in the air duct Setzgutträger each with a material feed and a discharge device, wherein the intermediate space between the Setzgutträgern is enclosed by an outer wall and to increase the upper Setzgutträger supplied air quantity at least one lower Setzgutträger bridging bypass air line from the air supply line downstream of the pulse valve and is connected to the space between the two Setzgutträgern such that over the bypass air line, an additional working air flow into the space between the Setzgutträgern can be introduced.

With the invention has the advantage that by means of at least two superposed in the same air stream Setzgutträger about twice the amount of material can be processed without the areal interpretation of Setzgutträger changes. If, in the case of a known air jet machine, the surface area of a setting material carrier is increased in order to increase the throughput, on the one hand the air requirement for the flow through the larger area with working air would correspondingly increase, but also the usually connected with high cost filter system for the exhaust air should be designed to be correspondingly larger. In accordance with the invention, however, the energy still contained in the working air guided through the first lower setting material carrier is used to flow through at least one second setting material carrier, the working air to be led through the intermediate space between the setting material carriers being channeled through the housing wall enclosing the intermediate space. As far as according to the invention, in order to increase the amount of air supplied to the upper Setzgutträger at least one bypass air line bridging the lower Setzgutträger is connected to the space between the two Setzgutträgern, occurring especially in the field of task and discharge organs leakage losses are compensated for setting air. By the additional connection of the intermediate space to the air supply line behind the pulse valve is ensured that the intermediate space supplied additional air quantity has the same pulse shape as the lower Setzgutträger supplied working air. In addition, the throttling losses occurring at the outlets of the air supply line in the region of the air funnel are thus bypassed, so that a larger amount of energy is available in the additional air quantity introduced into the intermediate space.

For better control of the additional air quantity and several bypass air lines can be provided. The arrangement of more than two Setzgutträgern one above the other can be covered by the invention. Since the air-laying machine according to the invention does not build much larger than air mesh machines with a setting material carrier with at least two stacking carriers arranged one above another, the inventive design of the air-placing machine results in a specific saving in investment costs with regard to the costs of the steel construction and the costs of the mechanical device.

It is understood that in the arrangement of at least two, but also of several Setzgutträgern in the same air flow one above the other, the pressure at the bottom Setzgutträger must be set higher by the additionally occurring at the other Setzgutträgern pressure drops, so a more powerful working air fan must be provided , However, an optionally available additional fan power is significantly lower than with a correspondingly assumed increase in the setting bed area in the case of only one setting material carrier.

Since the airflow reaches the same state as in an airnetwork machine with only one setting material carrier after passing through the upper setter carrier, the size and capacity of the subsequent filter system can be maintained, so that no additional installations are required here, which is also an advantage of the invention.

According to one embodiment of the invention, it is provided that the bypass air duct is arranged outside the housing of the air setting machine and connected to a mounted on the housing wall air distributor, wherein in the housing wall the air distributor with the space between the Setzgutträgern connecting nozzle openings are arranged.

According to one embodiment of the invention it is provided that in the bypass air line, a control valve is switched on to control the amount of air flowing through the bypass air line.

With regard to a further possible use of the air setting machine can also be provided that are arranged in the space between the Setzgutträgern enclosing wall by means of a control device adjustable blow-off.

In a first embodiment, the invention provides that in each case identical setting conditions are set at the upper setting tray and the lower setting tray; For this purpose, either the layer depth of the layered material to be stacked on the upper setting material can be adjusted or the setting area of the upper setting material carrier can be changed accordingly, or both aforementioned parameters can be designed jointly and in coordination with each other, depending on the flow of the lower setting material carrier associated pressure loss of the air flow.

Alternatively, it can be provided that several bypass air lines and / or multiple blow-off openings are provided for setting different layer thicknesses of the heavy material layered on the setting material carrier in the lower and upper setting material carriers.

With regard to the supply of the working air can in a per se from the generic DE 20 2005 007 472 U1 be provided known manner that the air funnel from two mutually separate, in the conveying direction of the material on the setting tray connected in series chambers and that a common air supply line in both chambers and in the area of each chamber with at least one outlet for the approached via the air supply line working air is provided. To set the respective, introduced into the chambers partial flows of working air can be provided that the chambers of the venturi associated outlets of the air supply line are adjustable in cross section.

To bring the working air can be provided that in the air supply line outside the air funnel, a pulse valve to the common Generation of a constant partial flow and this superimposed pulsating partial flow is turned on, it being possible to provide that to the air supply line, a central fan for generating the air stream to be introduced into the air funnel is connected.

In the context of such a design of the air funnel with two chambers, it may prove useful if the space between the two Setzgutträgern is divided according to the formation of the air funnel with chambers by a arranged between the upper Setzgutträger and the lower Setzgutträger separating flap also in two chambers. Within the scope of such a design, it is understood that each of the chambers formed in the intermediate space can each be connected to the air supply line via its own bypass air line or a plurality of bypass air lines or else can have its own blow-off openings in the associated wall of the intermediate space. With this measure too, the setting conditions at the upper setting material carrier must be maintained or adjusted with regard to the setting conditions at the lower setting material carrier.

The setting result and the throughput of the jig are improved according to an embodiment of the invention in that the Setzgutträger are offset by means of an associated drive, preferably by means of a vibration exciter in vibration.

As far as can be provided that each Setzgutträger own material task, for example, is assigned in the form of a cellular wheel, an embodiment of the invention also provides that for both Setzgutträger a central material task with the common Beistellung each of the respective Setzgutträger supplied material partial stream is set up. This is a saving also connected to the material supply side.

The interpretation of known Luftsetzmaschinen with a single Setzgutträger leads to a restriction of the separation success in two products, namely in a light material, for example in the form of coal, and in a heavy cargo, for example in the form of by-products or mountains. A higher purity of the light goods can be achieved in a known air mesh machine only by the fact that a certain proportion of light material is granted in heavy goods, which is disadvantageous in a two-unit airnet machine.

The inventive design of a generic air mesh machine now makes it possible for the first time to produce three or even more products with a Luftsetzmaschine by the still lightweight parts containing heavy layer is fed from the upper Setzgutträger as feed to the lower Setzgutträger on which then a separation of the still in the heavy contained light goods from the heavy cargo. Since this process can be intensified with the arrangement of more two Setzgutträgern, the production of more than three products in a Luftsetzmaschine with cascading arranged Setzgutträgern is possible.

Specifically, it is thus provided according to an embodiment of the invention that the material application device for the material to be processed is assigned to the upper Setzgutträger and the discharge device for the layered on the upper Setzgutträger heavy material is connected as a material feeding device for the lower Setzgutträger with this.

In order to be able to utilize the natural conveying direction, it can be provided that the upper and lower setting material carriers are arranged with an opposite inclination to one another.

As already mentioned, according to one embodiment of the invention it can be provided that a larger number of setting material carriers are arranged one above the other.

Fig. 1

eine Luftsetzmaschine mit zwei übereinander angeordneten Setzgutträgern in einer schematisierten Darstellung ohne die Darstellung der zusätzlichen Bypass-Luftleitung,

Fig. 2

die in Figur 1 dargestellte Luftsetzmaschine einschließlich der Darstellung der Bypass-Luftleitung sowie mit einem unterteilten Zwischenraum zwischen den Setzgutträgern,

Fig. 3

die Luftsetzmaschine gemäß Figur 1 in einer anderen Ausführungsform wiederum ohne die Darstellung der Bypass-Luftleitung.

In the drawings, embodiments of the invention are shown, which are described below. Show it:

Fig. 1

an airnetwork machine with two stacked media carriers in a schematic representation without the representation of the additional bypass air line,

Fig. 2

in the FIG. 1 illustrated air net machine including the representation of the bypass air line and with a subdivided space between the Setzgutträgern,

Fig. 3

the air gun according to FIG. 1 in another embodiment, again without the representation of the bypass air line.

For a better understanding of the invention, the basic structure of the air-laying machine according to the invention is first shown, without the additional bypass air lines.

The extent in FIG. 1 reproduced air conditioning machine 10 has a feed hopper 11, which opens into a cellular wheel 12, which is designed in a special way so that the cellular 12, the in the Feed hopper 11 vorbereite reprocessing material 17 distributed on two feed hoses 13 and 14. The two feed chutes 13 and 14 each end at the one end of two in the air setting machine 10 in an inclined arrangement one above the other and spaced apart Setzgutträgern 15 (upper Setzgutträger) and 16 (lower Setzgutträger). Due to the known motion kinematics of the airnet machine, the discontinued material 17 is layered as a setting material in the course of its transport over the length of the two Setzgutträger 15, 16 each in a heavy material layer 18 and in a light material layer forming above 19th

At the rear, the respective feed chute 13 and 14 opposite end of the two Setzgutträger 15 and 16 respectively a discharge device in the form of a weir 20 is provided which separates the heavy material layer 18 of the Leichtgutschicht 19 at each Setzgutträger 15,16 such that the heavy material layer 18th each passed into a first discharge chute 21, while the Leichtgutschicht 19 passes over the weir 20 away into the discharge chute 23 for the light goods. In order to improve the discharge work, a cellular wheel 22 for discharging the heavy material is still provided in the two discharge shafts 21, each of which is provided for the heavy material.

The air-laying machine 10 is closed to the outside via an enclosure 25 rising above the upper setting material carrier 15, so that the dust which possibly arises during the dry-processing can not escape into the atmosphere. The extent of the upper Setzgutträgern 15 outgoing exhaust air stream 27 is fed to a connected to the enclosure 25 exhaust system 26, which includes a filter system, not shown. Thus, the environmental impact is kept correspondingly low by such a Luftsetzmaschine.

Below the lower Setzgutträgers 16 an air funnel 28 is arranged, via which the required for the implementation of the setting movement of working air is directed from below to the formed as a perforated metal sheet or wire mesh bottom Setzgutträger 16. The air funnel 28 is divided by a partition wall 29 into two separate chambers 30,31, of which the first chamber 30 is adjacent to the feed chute 13 and 14 and the second chamber 31 to the first chamber 30 in the conveying direction of the Setzgutträger 15, 16 each guided material connects.

In the air funnel 28, an air supply line 32 is guided, in each chamber 30, 31 associated with an outlet 33 is arranged so that the zoomed in via the air supply line 32 working air 35 can flow via the respective outlet 33 into the chamber 30 and 31 respectively. With regard to the generation of the setting movement, a pulse valve 34 is turned on in the air supply line 32 in front of the air funnel 28, via which both the Setzgutträger 15, 16 constantly flowing through partial flow of working air and the above stored pulsating partial flow is generated.

In order to channel the effluent from the top of the lower Setzgutträgers 16 working air the upper Setzgutträger 15, the gap between the two Setzgutträgern 15, 16 enclosed by an outer housing 40, against the housing 25 on the one hand and against the air vent 28 on the other hand in a suitable manner is completed.

The two Setzgutträger 15 and 16 are in the illustrated embodiment still connected to a vibration generator 36, by means of which to improve the material transport on the Setzgutträger this Setzgutträger 15, 16 with respect to the fixed air funnel 28 and the housing 25 are moved. For this purpose, the two Setzgutträger 15, 16 are each decoupled via a relative movement between the Setzgutträgern 15 and 16 and the spatially fixed parts of air duct 28 or enclosure 25 enabling seals 37 of the air vent 28 and the housing 25.

Out FIG. 1 As a result, the working air 35 brought up via the air supply line 32 divides into two partial streams in each chamber 30 and 31 and so far flows first through the lower setting material carrier 16. The exiting from the lower Setzgutträger 16 working air is supplied via the enclosed space 40 of the upper wall above the upper Setzgutträger 15 and fulfilled due to the energy still contained in the working air a corresponding function as setting air. After flowing through the upper Setzgutträgers 15, the working air is supplied as exhaust air stream 27 of the exhaust system 26.

It is readily apparent that with such an arrangement of at least two Setzgutträgern 15 and 16, the capacity of the air jig 10 is increased, without in comparison with a only one Setzgutträger having air jetting machine according to the prior art, a significant increase in space requirements and needs on steel construction and mechanical installations results. The invention is not limited to the arrangement of two Setzgutträgern, but it may also be provided additional additional Setzgutträger.

This in FIG. 2 illustrated embodiment agrees with the FIG. 1 Air jet machine described above with the proviso that now the arrangement of the bypass air lines 50 according to the invention is shown and that also in the space between the Setzgutträgern 15, 16 a Subdivision of the working air streams according to the arranged under the lower Setzgutträger 16 chambers 30, 31 of the air vent 28 is made. This should be the same conditions for the working air guide prevail when flowing through the upper Setzgutträgers 15 as in the lower Setzgutträger 16. For this purpose is at the bottom of the upper Setzgutträgers 15 a freely suspended and resting with its lower free end on the Leichtgutschicht 19 of the lower Setzgutträgers 16 separating flap 41, which divides the space between the Setzgutträgern 15, 16 in the chambers 30, 31 of the air vent 28 corresponding chambers 30 a and 31 a. With the resting of the separating flap 41, a sealing of the chambers 30a, 31a is connected to each other. With a view to optionally adjusting different pressure conditions in the chambers 30a, 31a, the partition flap 41 is movably suspended around an outwardly performed shaft 42, wherein on the shaft 42, an arm 43 is attached, which carries an adjustable weight 44. The angular position of the arm 43 serves at the same time as an indicator of the thickness of the total material layer resting on the lower Setzgutträger 16.

The bypass air lines 50a and 50b respectively connected to the two chambers 30a and 30b of the intermediate space between the setting material carriers 15, 16 emanate from the central air supply line 32, namely from their section between the pulse valve 34 and the air funnel 28. This is the advantage connected, that the resulting at the outlets 33 of the air supply line 32 in the region of the chambers 30 and 31 of the venturi 28 throttling losses are avoided. Furthermore, the air flow in the two chambers 30, 31 is not the same, but possibly due to the adjustable opening cross sections of the outlets 33 already a chamber-specific throttling has taken place, so that these individual control by the arrangement of the bypass air lines 50 a and 50 b outside the chambers 30, 31 is taken into account. The two bypass air lines 50a and 50b are outside of the housing of the air setting machine in the region of the space between the Setzgutträgern 15, 16 and opened into a respective outside of the housing mounted air distributor 51. The two air manifolds 51 are formed in the housing wall 40th Nozzle openings 52 connected to the space between the Setzgutträgern 15, 16, so that the supplied via the bypass air lines 50a, 50b additional air flow through the air manifold 51 and the nozzle openings 52 can flow into the gap. Preferably, the nozzle openings 52 have no equal cross-section, but are designed so that the most uniform possible distribution of the additional air quantity under the upper Setzgutträger 15 is formed. In the lines 50a and 50b also control valves 53 are turned on, so that the introduced into the chambers 30a and 30b additional air quantity can be set individually to account for any differences in setting behavior on the lower and upper Setzgutträger can. The introduced additional quantity of air is intended to compensate for the leakage losses of setting air occurring, in particular in the region of the task cellular wheel 12 and the discharge cell wheels 22.

Alternatively or additionally, in the space between the Setzgutträgern 15, 16 enclose housing wall 40 by means of another control device adjustable Abblasöffnungen be arranged to reduce the upper Setzgutträger 15 flowing out of the air vent 28 working air.

According to the invention, care is taken to ensure that in each case identical setting conditions prevail at the upper setting material carrier 15 and the lower setting material carrier 16, so that a uniform separation result can be achieved. But it can also by an appropriate control of the over additionally provided bypass air lines 50a, b introduced into the intermediate space additional air quantity or via the regulation of the arranged in the housing wall 40 blow-off different setting conditions to the upper Setzgutträger 15 can be adjusted.

This in FIG. 3 illustrated embodiment differs from the in FIGS. 1 or 2 illustrated embodiments essentially in that the two stacked Setzgutträger 15 and 16 do not serve to increase the total throughput in the air setting machine 10 by parallel connection, but that the two Setzgutträger 15 and 16 with a view to improving the Trennerfolges and the production of another third product are connected in series. For this purpose, the two Setzgutträger 15 and 16 are arranged with an opposite inclination to each other, wherein the heavy material layer 18 generated on the upper Setzgutträger 15 is fed via a discharge and feed device 38 as a material task the lower Setzgutträger 16. Here, the setting conditions are set to the Setzgutträger 15 that in the heavy layer 18 shares of light goods may still be included, whereby the separation success in heavy and light material in the upper Setzgutträger 15 is improved. The heavy material layer containing heavy material layer 18 at the upper Setzgutträger 15 is then subsequently passed over the lower Setzgutträger 16 and here again takes place a separation into a heavy layer 18 and a Leichtgutschicht 19, this Leichtgutschicht 19 of the lower Setzgutträgers 16 is discharged via a further light material shaft 39 ; This lightweight material can also be referred to as a secondary light goods or medium. Thus, it allows in FIG. 3 shown Luftsetzmaschine to separate the material to be processed 17 into three products, namely a light goods, a middle and heavy goods.

The features disclosed in the foregoing description, the claims and the drawings of the subject matter of these documents may be essential individually as well as in any combination with each other for the realization of the invention in its various embodiments.

Claims (16)

1. Air jigging machine (10) for the dry processing of raw materials, especially coal, comprising a material input device or feeding mechanism, at least one jigging-material carrier (15, 16) provided with openings, and a dispensing or discharge device for the heavy material and the light material layered upon the jigging-material carrier (15, 16) during the separating process, whereby for the loosening and layering of the material supplied to the jigging-material carrier (15, 16) into a heavy material layer (18), which acts as a jig bed, and into a light material layer (19) disposed thereon, an air flow flows through the jigging-material carrier (15, 16) as working air, the air flow being supplied from an air funnel (28) disposed below the jigging-material carrier (15, 16) and being composed of a partial flow that constantly flows through the jigging-material carrier (15, 16), and a pulsed partial flow superimposed thereon, characterized in that at least two jigging-material carriers (15, 16), which are arranged one over the other at a distance from each other and through which the air flow introduced into the air funnel (28) flows which is connected to an air supply conduit (32) having inserted therein a pulsing valve (34), each of the jigging-material carriers having a material input (13, 14) and a discharge or dispensing device (20), and are arranged above the air funnel, whereby the intermediate space between the jigging-material carriers (15, 16) is enclosed by an outer wall (40), and in order to increase the amount of air to be supplied to the upper jigging-material carrier (15), at least one bypass air line (50a, b) that bypasses the lower jigging-material carrier (16) branches off from the air supply line (32) downstream of the pulsing valve (34) and is connected to the intermediate space between the two jigging-material carriers (15, 16) in such a way that an additional working air flow can be introduced through the bypass air line (50a, b) into the intermediate space between the jigging-material carriers (15, 16).
2. Air jigging machine according to claim 1, characterized in that the bypass air line (50a, b) is disposed externally on the housing of the air jigging machine and is connected to an air distributor (51) mounted on the housing wall, whereby disposed in the housing wall (40) are nozzle openings (52) that connect the air distributor (51) with the intermediate space between the jigging-material carriers (15, 16).
3. Air jigging machine according to claim 1 or 2, characterized in that a control valve (53) is inserted into the bypass air line (50a, b) for the regulation of the quantity of air flowing through the bypass air line (50a, b).
4. Air jigging machine according to one of the claims 1 to 3, characterized in that discharge openings that can be regulated by means of a control device are disposed in the wall (40) that encloses the intermediate space between the jigging-material carriers (15, 16).
5. Air jigging machine according to one of the claims 1 to 4, characterized in that for setting respectively identical separating conditions for the lower (16) and the upper (15) jigging-material carriers, the layer thickness of the heavy material (18) layered upon the upper jigging-material carrier (15) and/or the separating surface of the upper jigging-material carrier (15) is adapted to the pressure loss of the air stream that is connected with the flow of air through the lower jigging-material carrier (16).
6. Air jigging machine according to one of the claims 1 to 4, characterized in that for the establishment of different layer thicknesses of the jigging-material layered upon the jigging-material carrier a plurality of bypass air lines and/or a plurality of discharge openings are provided for the lower (16) and the upper (15) jigging-material carriers.
7. Air jigging machine according to one of the claims 1 to 6, characterized in that the air funnel (28) is comprised of two chambers (30, 31) that are separated from one another and in the direction of conveyance of the material over the jigging-material carriers (15, 16), are successively inserted, and in that a common air supply conduit (32) is guided into both chambers (30, 31) and in the region of each chamber (30, 31) is provided with at least one outlet (33) for the working air supplied via the air supply conduit (32).
8. Air jigging machine according to claim 7, characterized in that outlets (33) associated in the chambers (30, 31) of the air funnel (28) are provided with a variable cross-sectional area.
9. Air jigging machine according to claim 7 or 8, characterized in that a central blower is connected to the air supply conduit (32) for the generation of the air flow that is to be introduced into the air funnel (28).
10. Air jigging machine according to one of the claims 7 to 9, characterized in that the intermediate space between the two jigging-material carriers (15, 16), in conformity with the configuration of the air funnel (28) with chambers (30, 31), is separated into two chambers (30a) and (31 a) by means of a separating flap (41) that is disposed between the upper jigging-material carrier (15) and the lower jigging-material carrier (16).
11. Air jigging machine according to claim 10, characterized in that each chamber (30a) and (31a) of the intermediate space is respectively connected to a separate bypass air line (50a, b).
12. Air jigging machine according to one of the claims 1 to 11, characterized in that the jigging-material carriers (15, 16) are caused to vibrate by means of an associated drive (36).
13. Air jigging machine according to one of the claims 1 to 12, characterized in that for both jigging-material carriers (15, 16) a central material-feeding mechanism (11, 12) is provided and has the common provision of a respective partial material stream conveyed to the respective jigging-material carrier (15, 16).
14. Air jigging machine according to claim 13, characterized in that the material-feeding mechanism (11, 12) for the material (17) that is to be processed is associated with the upper jigging-material carrier (15), and the discharge device for the heavy material (16) layered on the upper jigging-material carrier (15) is connected with the lower jigging-material carrier (16) as a material feed device (38) for this lower jigging-material carrier.
15. Air jigging machine according to claim 14, characterized in that the upper (15) and the lower (16) jigging-material carriers are disposed at angles relative to one another that extend in opposite directions.
16. Air jigging machine according to one of the claims 1 to 15, characterized in that a greater number of jigging-material carriers are disposed one above the other.

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