SCREENING SYSTEM WITH FEEDING SYSTEM, CONVEYING SYSTEM AND CONVEYING METHOD

Abstract

A screening system for separating/screening a conveying medium formed as fluid, powder and/or bulk material comprising a screening system inlet, a screening system outlet, a screen between the inlet and outlet, a feeding system for feeding the medium upstream of the inlet and/or the screen, a transport path between the inlet means and the outlet means, which is delimited by a conveyor channel line, a flow-limiting means wherein the volume flow of the conveying medium can be changeably limited is arranged in or down-stream from the transport path that comprises a flat transport surface, which is formed as a flat metering plate and a metering plate edge forms the outlet means of the feeding system, the flow-limiting means comprises an outlet opening wherein the outlet opening size can be changed to change the volume flow of the medium, which passes through the outlet opening that is arranged at the end of a conveyor channel or line of the feeding system, the outlet opening is arranged between the conveyor channel or line and the outlet means, in particular upstream of or on the transport surface and an oscillation can be applied to the medium.

Claims

1-14. (canceled)

15. A screening system for separating/screening a conveying medium formed as fluid, powder and/or bulk material, the screening system comprising a screening system inlet and at least one screening system outlet and at least one screen arranged between the screening system inlet and the at least one screening system outlet, a feeding system for feeding an associated conveying medium formed as fluid, powder and/or bulk material, which, based on a conveying direction of the associated conveying medium, is arranged upstream of at least one of the screening system inlet and the at least one screen, the feeding system comprising an inlet means and at least one outlet means; wherein provision is made between the inlet means and the at least one outlet means for a transport path, which is delimited by means of a conveyor channel or by means of a conveyor line; wherein a flow-limiting means, by means of which a volume flow of the associated conveying medium can be limited in a changeable manner, is arranged in or downstream from the transport path; wherein the flow-limiting means comprises at least one flat transport surface, which is formed as a flat metering plate, wherein a metering plate edge forms the outlet means of the feeding system; wherein the flow-limiting means comprises an outlet opening having an outlet opening size, wherein the outlet opening size can be changed to change the volume flow of the associated conveying medium, which passes through the outlet opening, wherein the outlet opening is arranged at an end of the conveyor channel or the conveyor line of the feeding system, and wherein the outlet opening is arranged between the conveyor channel or the conveyor line and the outlet means; and wherein an oscillation can be applied to the associated conveying medium.

16. The screening system according to claim 15, wherein the outlet opening is arranged upstream of or on the transport surface.

17. The screening system according to claim 15, wherein the outlet opening size is changed by changing a distance between the conveyor channel, which leads to a transport surface or the conveyor line, which leads to the transport surface of the feeding system and of the transport surface.

18. The screening system according to claim 15, further including an electromechanically operable control circuit, which regulates the volume flow and controls the outlet opening size.

19. The screening system according to claim 15, further including a controllable and/or regulatable feeding system oscillation source, which transfers an oscillation to at least one of the feeding system, the inlet means the conveyor channel, a conveyor line, the flow-limiting means and the outlet means, which oscillation can be transferred to the associated conveying medium via at least one of the feeding system, the inlet means, the conveyor channel, the conveyor line, the flow-limiting means and the outlet means.

20. The screening system according to claim 15, further including a screening system oscillation system, by means of which a mechanical oscillation can be applied to at least one of the associated conveying medium, one or all components of the screening system, one or a plurality of components of the feeding system and the flow-limiting means, and by an ultrasonic oscillation system, by means of which an ultrasonic oscillation can be applied to at least one of the screening system, a component of the screening system and the at least one screen of the screening system.

21. The screening system according to claim 20, further including at least one controllable and/or regulatable mechanical coupling, by means of which ultrasonic oscillations can be transferred from the feeding system to at least one of the screening system inlet, the screening system outlet and the at least one screen of the screening system, and/or by means of which ultrasonic oscillations can be transferred from at least one of the screening system inlet, the screening system outlet and the at least one screen of the screening system to the feeding system.

22. The screening system according to claim 20, further including at least one uncoupling, by means of which oscillations can be blocked mechanically and/or acoustically between the feeding system and further components of the screening system.

23. The screening system according to claim 20, further including at least one mass element, which is mechanically coupled to the screening system oscillation system.

24. The screening system according to claim 15, further including a screening system housing.

25. The screening system according to claim 15, wherein the flow-limiting means, which comprises a metering plate, is arranged in or on the at least one screen or in the area of the at least one screen.

26. The screening system according to claim 20, further including a positioning means for positioning the volume flow at least one of upstream of and downstream from the feeding system.

27. A modularly constructed conveying system for conveying an associated conveying medium formed as fluid, powder and/or bulk material, including a screening system according to claim 15.

28. The conveying system according to claim 27, wherein the associated conveying medium can be conveyed in a closed environment, which contains at least an inert fluid.

29. A method for conveying a conveying medium formed as fluid, powder and/or bulk material, wherein in one method step, the conveying medium is fed or metered in that the flow of the conveying medium is limited on the conveying path of the conveying medium, in that the conveying medium is conveyed through a conveyor passage against a conveyor barrier provided as flat metering disk, wherein the size of the conveyor passage can be changed, and wherein at least one of a mechanical oscillation and an ultrasonic oscillation, which can be transferred to the conveying medium, is applied to at least one of the conveyor passage and the conveyor barrier.

30. A screening system for separating/screening a conveying medium formed as fluid, powder and/or bulk material, the screening system comprising a screening system inlet and at least one screening system outlet and at least one screen arranged between the screening system inlet and the at least one screening system outlet, a feeding system for feeding an associated conveying medium formed as fluid, powder and/or bulk material, which, based on a conveying direction of the associated conveying medium, is arranged upstream of at least one of the screening system inlet and the at least one screen, the feeding system comprising an inlet means and at least one outlet means; wherein provision is made between the inlet means and the at least one outlet means for a transport path, which is delimited by means of a conveyor channel or by means of a conveyor line; wherein a flow-limiting means, by means of which a volume flow of the associated conveying medium can be limited in a changeable manner, is arranged in or down-stream from the transport path; wherein the flow-limiting means comprises at least one transport surface, which is formed as a metering plate, wherein a metering plate edge portion forms the outlet means of the feeding system; wherein the flow-limiting means comprises an outlet opening having an outlet opening size, wherein the outlet opening size can be changed to change the volume flow of the associated conveying medium, which passes through the outlet opening, wherein the outlet opening is arranged at an end of the conveyor channel or the conveyor line of the feeding system, and wherein the outlet opening is arranged between the conveyor channel or the conveyor line and the outlet means; and, wherein an oscillation can be applied to the associated conveying medium.

31. The screening system according to claim 30, wherein the metering plate is a flat metering plate.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0028] FIG. 1 shows a feeding system in a schematic view,

[0029] FIG. 2 shows a screening system in a (schematic) sectional view,

[0030] FIG. 3 shows a screening system in a perspective view according to FIG. 2 and

[0031] FIG. 4 shows a top view on the screening system according to FIG. 2.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0032] A schematic and highly simplified illustration of a feeding system 1 can be gathered from FIG. 1. A bulk material, for example, can be fed to a further device, for instance a screening system comprising a screen 3, by means of the feeding system 1. Only the screen 3 of the screening system is illustrated in outlines in FIG. 1. An ultrasonic oscillation system 33 can be arranged on or coupled to the screen 3, respectively. The feeding system 1 is located in the housing 2. The feeding system 1 comprises an inlet means 4. From there, the bulk material is transported via a transport path 5 through the feeding system 1. Provision can be made inside the feeding system 1 for a transport aid in the form of a fluid stream (gas, air, vacuum conveyor) or a mechanical transport aid. The transport of the bulk material can also be supported by the weight force acting on the bulk material. The transport path 5 is symbolized by arrows in FIG. 1. From the inlet means 4, the bulk material reaches into a conveyor channel 6. Based on the transport direction of the bulk material, a flow-limiting means 8 comprising a conveyor barrier 7 is located downstream from the conveyor channel 6. The volume flow of the bulk material can be changed with the help of the flow-limiting means 8.

[0033] The conveying carrier 7 is formed as metering plate 9 and comprises a transport surface 12 for the bulk material. The metering plate 9 can be formed in a rectangular or virtually rectangular manner and it is arranged above the screen 3. Provision can also be made for a round or virtually round or for an oval or virtually oval shape of the metering plate 9. A feeding system-oscillation system 11 is connected to the metering plate 9 via a mechanical coupling 10. The feeding system-oscillation system 11 generates an oscillation (ultrasonic oscillation and/or low frequency oscillation and/or mechanical oscillation and/or combinations thereof), which is transferred to the metering plate 9. The oscillation stimulation can take place via a piezoelectric or electromagnetic or mechanical transducer.

[0034] The distance A between conveyor channel 6 and metering plate 9 can be changed (mechanically). This can take place in that the position of the metering plate 9 is changed relative to the end 13 of the conveyor channel 6. In the alternative or cumulatively, the position of the conveyor channel 6 can be changed relative to the metering plate 9. For this purpose, provision can be made for a shiftable sleeve in the end area of the conveyor channel 6. The change in position of metering plate 9 or conveyor channel 6 can take place manually or (electro)mechanically, for example by means of an actuator.

[0035] An outlet opening formed as outlet gap 14 is formed by means of the distance A between conveyor channel 6 and metering plate 9, and by changing the distance A between channel 6 and plate 9, the size of outlet opening/outlet gap 14 is changed. The flow of the bulk material can thus be regulated by means of the feeding system 1.

[0036] In the case of the embodiment shown in FIG. 1, an oscillation, which is transferred into a kinetic energy in the bulk material, is applied to the bulk material by means of the metering plate 9 by means of the oscillation system 11. The bulk material vibrates (with the plate) and thus moves on the metering plate 9 in the direction of the plate flange 15. The flange 15 forms the transport surface edge (15) and thus the outlet means 16 of the feeding system 1. The bulk material leaves the feeding system 1 via the outlet means 16 (formed as hopper or comprising a hopper) and flows or falls onto the screen 3.

[0037] According to an embodiment, which is not illustrated in FIG. 1, the feeding-oscillation system 11 can also be connected or coupled, respectively, to the housing 2 of the feeding system 1. As a result, it is not only the metering plate 9, which is fastened in the housing 2, which vibrates, but also the conveyor channel 6 and the housing 2. In that virtually the entire feeding system 1 thus vibrates, the oscillation is applied to the bulk material virtually across the entire transport path 5.

[0038] FIG. 2 shows a vertical sectional view of a screening system 20, in which a round or virtually round screen 3 is fastened in a screen container 21. In a top view, the screening system 20 would have a substantially round geometry (FIG. 4). The housing 29 of the screening system 20 comprises the screen container 21 and is fastened to a mass element 22. A screening system-oscillation system 23 for generating oscillation (approx. 0.5 Hz to 50,000 Hz), which applies a (low-frequency) oscillation to the screening system 20, which causes the driving metering oscillation, is arranged on the mass element 22. The oscillation is transferred to essential components (21, 22, 24, 25, 26, 27, 28) of the screening system 20, in particular to the metering plate 9 and/or the screen 3, from there to the bulk material, which is to be separated with respect to the bulk material grain size in the screening system 20 by means of the screen 3. In addition, an ultrasonic oscillation coupling can be capable of being activated via an ultrasonic generator 33, by means of which an ultrasonic oscillation is mainly applied to the screen.

[0039] An actuator element or a shaker, respectively, are not illustrated in the figures, by means of which a flow-influencing rotary and/or vertical oscillation of the metering disk can be generated. A vertical pulsating of the disk can be attained by means of a linear oscillator, whereby an up and down movement is transferred to the particles of the conveying medium. A movement pointing in the radial direction (outwardly) is preferably transferred to the particles by means of a right-left alternating rotational deflection of the disk.

[0040] The screening system 20 comprises a screening system inlet 24 comprising a hopper 25, which forms a positioning means or a positioning aid or guide aid, respectively, for the bulk material. A feeding system 1′, via which the bulk material is fed to a feeding hopper 26 connected upstream of the screen 3, is assigned to the screening system inlet 24. The feeding system 1′ comprises a conveyor channel 6′, which is formed in a hopper-like manner, for a section of the transport path 5′ of the bulk material, which comprises the inlet means 4′ of the feeding system 1′. An outlet gap 14′, which can be changed with respect to its dimensions, is located between the hopper outlet 27 and the round metering disk 9′, which is arranged downstream therefrom. The dimensions of the outlet gap 14′ are changed by shifting the hopper 25 and/or the hopper outlet 27.

[0041] The metering disk 9′ is connected to the housing 29 via the disk holder 28 and is mechanically coupled via the holders 28 with respect to the oscillation transfer. The oscillations of the oscillation system 23 are thus also transferred to the metering disk 9′. The flow-limiting means 8′ of the feeding system 1′ is thus formed by the changeable outlet gap 14′ (gap dimension A′) and the oscillation-stimulatable metering disk 9′. The bulk material is stimulated kinetically on the transport path 5′ by means of the oscillation-induced vibration of the hopper 25 and of the metering disk 9′. On the metering disk 9′, the bulk material moves substantially in the radial direction to the outside to the edge of the disk 9′. There, the bulk materials falls over the edge 15′ into the feeding hopper 26, from where it reaches onto the screen 3. As a result of the vibration of the screen 3, large grain sizes of the bulk material reach an oversized grain outlet 32, small grain sizes reach through the screen 3 to the undersized grain outlet 31, which is separated from the oversized grain outlet 32.

[0042] An embodiment of the screening system, in which an uncoupling is provided in the area of the holders 28, by means of which the oscillation, of an oscillation system (23, 33) is not transferred to the metering disk 9′, is not illustrated in FIG. 2. Provision can be made for an additional oscillation system (11, see FIG. 1), by means of which the metering disk 9′ can be supplied with an oscillation independently from the oscillation system (23, 33). This additional oscillation system (11) of the screening system makes it possible to control the oscillation of the screen 3 and the oscillation of the metering disk 9′ separately from one another. Oscillation amplitude and/or oscillation frequency and/or oscillation modulation and/or oscillation duration on the screen 3 and/or on the metering disk 9′ can thus be adjusted, in particular separately from one another, whereby the homogeneity of the flow can be adapted to the flow behavior of the product more individually.

[0043] One or a plurality of measuring systems for measuring several flow-relevant measuring data inside the screening system 20 are also not illustrated in FIG. 2. For example the flow (volume flow) of the bulk material can belong to these measuring data. A control circuit can be supplied with the help of the measuring data, so that for instance a gap dimension (A, A′) and/or the parameters of the oscillation (amplitude, frequency, modulation) can be controlled as a function of the measured values. If the flow decreases in an undesired manner, the oscillation amplitude can be increased; should the flow decrease in an undesired manner, the oscillation amplitude could be reduced or deactivated.

[0044] A perspective view of a screening system 20 according to FIG. 2 can be gathered from FIG. 3. The transport path of the bulk material, which substantially runs downwards, can be traced by means of FIG. 3. The bulk material is filled in on the top and exits from the system 20 again on the bottom—separated by grain size. Provision can be made in the area of the feeding system 1′ for a cylindrical window (not illustrated in FIG. 3), through which the product flow can be controlled. On the connecting rings 30, the window can be connected to the screening system. The screening system 20 can be designed in such a way that the bulk material can always be conveyed within a gas-tight or virtually gas-tight device. The screening system 20 can be capable of being filled with an inert gas, for example, so that the bulk material is conveyed in an inert gas atmosphere inside the screening system 20.

[0045] The screening system 20 according to FIGS. 2 and 3 can be an integrated or integratable (modular) part of a (modularly constructed) conveying system, by means of which the bulk material can be conveyed from a first conveying station to a second conveying station or to further conveying stations.

LIST OF REFERENCE NUMERALS

[0046] 1, 1′ feeding system [0047] 2 housing [0048] 3 screen [0049] 4, 4′ inlet means [0050] 5, 5′ transport path [0051] 6, 6′ conveyor channel [0052] 7 conveyor barrier [0053] 8, 8′ flow-limiting means [0054] 9, 9′ metering plate, metering disk [0055] 10 mechanical coupling [0056] 11 oscillation system [0057] 12 transport surface [0058] 13 end [0059] 14, 14′ outlet gap [0060] 15, 15′ flange, edge [0061] 16 outlet system [0062] 20 screening system [0063] 21 screen container [0064] 22 mass element [0065] 23 oscillation system [0066] 24 screening system inlet [0067] 25 hopper [0068] 26 feeding hopper [0069] 27 hopper outlet [0070] 28 disk holder [0071] 29 housing [0072] 30 connecting ring [0073] 31 undersized grain outlet [0074] 32 oversized grain outlet [0075] 33 ultrasonic oscillation system [0076] A, A′ distance