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EP0367213B1 - Screening machine for bulk material - Google Patents

Screening machine for bulk material Download PDF

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Publication number
EP0367213B1
EP0367213B1 EP89120166A EP89120166A EP0367213B1 EP 0367213 B1 EP0367213 B1 EP 0367213B1 EP 89120166 A EP89120166 A EP 89120166A EP 89120166 A EP89120166 A EP 89120166A EP 0367213 B1 EP0367213 B1 EP 0367213B1
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EP
European Patent Office
Prior art keywords
bulk material
machine according
pressure
screen
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89120166A
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German (de)
French (fr)
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EP0367213A2 (en
EP0367213A3 (en
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IBV
Original Assignee
IBV
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Publication date
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Priority to AT89120166T priority Critical patent/ATE103846T1/en
Publication of EP0367213A2 publication Critical patent/EP0367213A2/en
Publication of EP0367213A3 publication Critical patent/EP0367213A3/en
Application granted granted Critical
Publication of EP0367213B1 publication Critical patent/EP0367213B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B07B1/20—Stationary drums with moving interior agitators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S209/00—Classifying, separating, and assorting solids
    • Y10S209/925—Driven or fluid conveyor moving item from separating station

Definitions

  • the invention relates to a screening machine for bulk material according to the preamble of claim 1.
  • the bulk material to be screened is sucked into the machine via the inlet designed as an intake nozzle.
  • the bulk material arrives in a sieve drum in which beaters rotate at high speed and throw the bulk material and the air against the sieve drum.
  • the air with the loose flour particles passes through the sieve and is sucked off through the separators.
  • the bulk material is separated in the separator and, after passing through the sieve drum, reaches an annular area which is delimited radially inwards by the sieve drum and radially outwards by the housing jacket.
  • the bulk material passes from this ring-shaped area into the separator, which tapers downwards in a funnel shape.
  • the funnel-shaped constriction has the disadvantage that the bulk material is increasingly compressed and thus compressed during discharge in accordance with the increasing cross-sectional constriction of the outlet. This easily leads to blockages and to the tearing off of the bulk material flow because, due to the narrowing of the cross section and the compression of the bulk material, bridging occurs in the outlet, which prevents the bulk material from being transported away continuously.
  • the invention has for its object to design a screening machine of this type so that the bulk material evenly and without risk of tearing off the bulk material flow through the Screening machine can be promoted.
  • the zone with the reduced static pressure is located in the transport path of the bulk material after the screen.
  • the bulk material can therefore be continuously conveyed in an optimal manner.
  • the bulk material can relax in the area following this reduced static pressure because the area widens in cross-section in the conveying direction of the bulk material. This reliably prevents bridges or dome formation in the bulk material, so that continuous conveyance of the bulk material is ensured.
  • the bulk material can be conveyed properly into the outlet, it is pressurized with compressed air in such a way that it is held approximately in suspension. For this purpose, compressed air is blown through the air-permeable feed, the pressure of which is equal to the weight of the bulk material.
  • the bulk material can therefore not be compressed in front of the outlet, so that it is easily ensured in this critical area that the bulk material is kept in a loose state.
  • the screening machine according to the invention it is achieved that the bulk material can be conveyed continuously and without the risk of the bulk material flow being cut off from the inlet through the screening machine to the outlet. This ensures continuous feeding of the respective bulk material to the device connected by the screening machine.
  • a conveyor system 1 is shown with a screening machine 2, which is integrated in the conveyor system.
  • the conveyor system or the conveyor system has an air compressor 3 to which a conveyor line 4 is connected.
  • a container 7 into which bulk material 6, preferably flour, fed from a silo 5 arrives.
  • the bulk material 6 is entrained in the line 4 by the air flow generated by the air compressor 3.
  • the line 4 is with a feed line 8, preferably with a feed pipe, connected to the screening machine 2, appropriately plug-in.
  • the bulk material 6 enters the sieving machine 2 from the feed line 8, is sieved there and then passes via a discharge line 9, preferably an outlet pipe, into a line 10 of the conveyor system 1 connected thereto.
  • a discharge line 9 preferably an outlet pipe
  • the sieved material to be conveyed is another Processing station (not shown), e.g. B. a scale supplied.
  • the screening machine 2 has a housing 11, 12, 13 with a cup-shaped housing lower part 11, a cylindrical housing wall 12 and an upper housing part 13 with a bearing cover 13a.
  • a drive shaft 14 is mounted in the upper housing part 13 and in the bearing cover 13a and is rotatably driven by a motor 15 via a pinion 16 and an intermediate shaft 16a.
  • the motor is attached to the upper part 13 via a bearing bracket 17.
  • the cup-shaped lower housing part 11 has a central passage opening 18 which is delimited by an annular wall 19 and to which a downpipe 23 connects from the outside, the inside diameter of which in the connection area is equal to the diameter of the passage opening 18.
  • the ring wall lies coaxially with the higher outer wall 20 of the lower housing part 11.
  • an annular disk 22 is fastened, with which the down pipe 23 projecting downward from the housing is held on the lower housing part 11.
  • the downpipe 23 protrudes obliquely outwards and has a passage opening 24, through which the connecting tube 8 projects outwards in a sealed manner. It is surrounded by the upper short, bent section 25 of the downpipe 23 at a distance in a central region.
  • the downpipe 23 is in the embodiment under one Angled at an angle of approximately 45 ° with respect to the connecting pipe 8 and closed from its lower end 26 with a quick-release fastener 27 (not shown in more detail).
  • material retained in a casing 28 in the housing 11 to 13 is collected and, if necessary, emptied from the downpipe.
  • An annular fluidized bed 29 is seated on the lower housing part 11 and rests with radially outwardly projecting peripheral edges 30, 31 on a shoulder 32 of the outer wall 20 or on the end face 33 of the annular wall 19.
  • the edge 31 is clamped between the end face 33 of the ring wall 19 and a ring 34.
  • the other edge 30 is fastened between the shoulder 32 and a further ring part 35 coaxially surrounding the ring 34.
  • the ring part 35 has an outer jacket 36, which has a radially outwardly directed, circumferential shoulder surface 36a near the end face of the outer wall 20 of the lower housing part 11, on which the lower end of the cylindrical housing part 12 rests.
  • the radial width of the shoulder surface 36a preferably corresponds to the thickness of the cylindrical housing part 12.
  • the ring part 35 lies in the region above the shoulder surface 36a on the inner wall of the housing part 12, which is thereby appropriately supported in the lower region.
  • the housing part 12 With its upper end 37, the housing part 12 protrudes into an annular shoulder 38 on the underside of the upper part 13.
  • the housing part 12 is radially secured and held in the annular shoulders 36a and 37 with pressure rings 39, 40, which are connected to an annular flange 41 of the lower housing part 11 or are screwed to the lid edge 42.
  • the ring part 35 preferably has an approximately triangular cross section, the triangular tip 35a of which points radially inwards. As a result, the ring part 35 has its smallest clear width at the level of the triangle tip and widens from there upwards and downwards. In this way, an annular space 43 and 44 which tapers downward and in the area below which extends downward is formed in the area above the circumferential triangular tip 35a.
  • the upper annular space 43 has a slightly greater height than the lower annular space 44.
  • the narrowing 45 formed between these spaces 43, 44 means that the annular part 35 forms a type of injector nozzle, as will be explained.
  • the ring 34 is adjacent to the lower annular space 44.
  • the drive shaft 14 projects with a widened end section 14a into the upper end 50a of a tubular support body 50 of an annular brush 51 of the screening machine 2.
  • the connecting tube 8 with its free end 57 projects into the lower end 56 of the support body 50 with play.
  • the support body 50 has several through openings 47, 48 designed as axial longitudinal slots for the bulk material to be screened.
  • the passage openings are preferably arranged in rows one above the other and one behind the other with circumferential spacing, so that the support body 50 still has sufficient strength despite the passage openings 47, 48.
  • the passage openings 47, 48 each extend almost over half the height of the support body 50.
  • the drive shaft 14 has at its lower end 14a a downwardly deflecting deflection part 49 for the material to be conveyed, which downwards tapered like a cone. 2 shows the lateral surface 49a of the deflection part 49 is concavely curved in cross section.
  • Bristle strips are attached to the outside of the supporting body 40 with tufts of bristles, the free ends of which extend close to the cylindrical sieve 28. It preferably consists of a perforated metal sheet.
  • the screen 28 is preferably clamped radially against a shoulder 13c of the housing 13 at its upper end 28a with a clamping ring 13b fastened to the upper housing part 13.
  • the lower end of the sieve 28 is fastened on the outer casing 52 of the ring 34 fastened on the lower housing part.
  • the upper edge 53 of the ring 34 lies approximately at the level of the constriction 45. This edge 53 is adjoined radially inwards by a conical surface 55 which extends obliquely downwards and approximately up to half the height of the ring. It extends up to over the lower end 56 of the support body 50. On the conical surface 55, the sieved particles can easily slide down into the downpipe 23.
  • the upper end 57 of the connecting pipe 8 lies at the level of the lower edge 58 of the lower longitudinal slots 47.
  • the fluid bed 29, which is partially circular in cross section between its edges 31, 32, connects with its inner side directly to the cylindrical outer jacket 52 of the ring 34 and the lower inner wall 61 of the ring member 35 lying on a conical jacket surface.
  • the screened material is collected in the fluidized bed 29 for further transport through the outlet pipe 9 (FIG. 1) and the line 10.
  • the material to be conveyed in particular flour, is introduced into the conveying line 4 via the silo 6 and the container 7 for sieving.
  • the material to be conveyed is transported by means of the compressed air flow generated by the air compressor 3 to the screening machine 2, in which it is screened and then conveyed on in a conveyor circuit of the conveyor system.
  • a suction flow can also be generated in the conveying position 1, with which the material to be conveyed is transported by underpressure.
  • the corresponding pump is located behind the screening machine 2 in the flow direction of the conveyed material.
  • the flour to be sieved enters the brushing device 51 via the connecting pipe 8.
  • the material to be conveyed thus enters the screening machine 2 in the vertical direction from below or in the axial direction of the brushing device of the screening machine.
  • the material to be conveyed passes through the openings 47, 48 of the support body 50 into a brush chamber 70 between the screen 28 and the support body 50, in which the bristles circulate and in which the material to be screened is combed. Since the deflecting part 49 ends in a pointed shape and its lateral surface is concavely curved in cross section, the vertically directed upward flow is optimally deflected and divided approximately in a horizontal direction so that the deflected flow can flow properly through the passage openings 47, 48.
  • the flow is deflected in the horizontal direction, so that the conveyed material contained in the deflected flow is pressed through the cylindrical sieve 28 and sieved in the process.
  • the screened material cannot flow back into the feed line due to the excess pressure in the delivery line 4 and in the feed channel 60 of the brush 51. Rather, it is deflected downward into the downpipe 23 on the inner wall 28a of the sieve due to its own weight and the rotary movement of the brush 51. There it can be emptied if necessary, for which purpose only the quick release (not shown) 27 has to be opened. The downpipe is then closed again with the quick-release fastener, which prevents pressure loss in the conveyor system.
  • the material to be conveyed After brushing in the brush chamber 70 and passing through the sieve 28, the material to be conveyed enters the sieve space 71, which adjoins the radially outward, between the sieve 28 and the housing part 12 45 into the annular space 44 adjoining at the bottom and thus into the fluidized bed 29. It is attached to the lower end of the screen jacket or the cylinder wall 12 of the housing 11, 12, 13.
  • the fluidized bed 29 is made of an air-permeable material, such as sintered polyethylene. It is ventilated with compressed air from below. The air seeping upwards through the fluidized bed supports the return of conveyed material in the fluidized bed into the flow.
  • the injector nozzle 35 leads to an increase in the flow velocity and a lowering of the static pressure, which facilitates the promotion of the good.
  • the conveying pressure which presses the conveyed material through the injector nozzle 35, forces the conveyed material in the fluidized bed 29 to flow in the direction of flow (arrow 73 in FIG. 3) into the outlet pipe 9, that is to say in the direction of the lower pressure.
  • the entire delivery system is considered static, i. H. the entire pressure distribution in the screening machine 2 is regarded as a snapshot and thus as static. The flow rate is therefore not taken into account.
  • the pressure P 1 which prevails in the connecting pipe 8 and in the support body 50 is greater than the pressure P 2 in the brush chamber 70. It is again greater than the pressure P3 prevailing in the screen chamber 71 which is greater than the pressure P4 in the annular space 43. It is greater than the pressure P6 in the outlet pipe 9.
  • the pressure P5 below the fluidized bed 29 is equal to the weight of the material being conveyed.
  • the material to be conveyed can be kept approximately in suspension in the fluidized bed 29, so that it can easily be conveyed to the outlet pipe 9.
  • a protective screening of the conveyed material, in particular flour, can be achieved within the conveyor system 1, as is increasingly required by bakeries and the like.
  • the sieved material After exiting the outlet pipe 9 of the screening machine 2 the sieved material arrives in a further conveying line 10 of the conveying device 1, in which it is conveyed further in the conveying flow.
  • the sifted good then arrives at a balance or similar facility in which the bulk material or flour can be processed further.

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  • Combined Means For Separation Of Solids (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Confectionery (AREA)

Abstract

The screening machine is intended for bulk material, in particular flour, and has an inlet (8) for the bulk material, downstream of which is a screen (28). The bulk material is conveyed through the screen (28) by means of an air current. Lying beyond the screen (28) in the conveying path of the bulk material is a zone (45) of reduced static pressure which is joined, in the conveying direction, to a conveying region (44) of increasing cross-section. The weight of the bulk material upstream of the outlet (9) for the screened bulk material is at least approximately equal to the oppositely directed pressure (P 5) of compressed air below an air-permeable feed (29) of the bulk material. The bulk material can be conveyed through the screening machine uniformly and without the risk of breakdown of the flow of bulk material. <IMAGE>

Description

Die Erfindung betrifft eine Siebmaschine für Schüttgut nach dem Oberbegriff des Anspruches 1.The invention relates to a screening machine for bulk material according to the preamble of claim 1.

Bei einer bekannten Siebmaschine dieser Art (DE-C 867 193) wird das zu siebende Schüttgut über den als Ansaugstutzen ausgebildeten Einlaß in die Maschine gesaugt. Das Schüttgut gelangt in eine Siebtrommel, in der Schläger mit hoher Drehzahl umlaufen und das Schüttgut und die Luft gegen die Siebtrommel schleudern. Die Luft mit den losgeschlagenen Mehlteilchen passiert das Sieb und wird über die Abscheider abgesaugt. Das Schüttgut wird im Abscheider abgeschieden und gelangt nach dem Durchtritt durch die Siebtrommel in einen ringförmigen Bereich, der radial nach innen durch die Siebtrommel und radial nach außen durch den Gehäusemantel begrenzt ist. Das Schüttgut gelangt aus diesem ringförmigen Bereich in den Abscheider, der sich nach unten trichterförmig verjüngt. Die trichterförmige Verengung hat den Nachteil, daß das Schüttgut beim Austragen entsprechend der zunehmenden Querschnittsverengung des Auslasses zunehmend komprimiert und damit verdichtet wird. Dies führt leicht zu Verstopfungen und zum Abreißen des Schüttgutstromes, weil infolge der Querschnittsverengung und der Verdichtung des Schüttgutes im Auslaß eine Brückenbildung auftritt, die einen kontinuierlichen Abtransport des Schüttgutes verhindert.In a known screening machine of this type (DE-C 867 193), the bulk material to be screened is sucked into the machine via the inlet designed as an intake nozzle. The bulk material arrives in a sieve drum in which beaters rotate at high speed and throw the bulk material and the air against the sieve drum. The air with the loose flour particles passes through the sieve and is sucked off through the separators. The bulk material is separated in the separator and, after passing through the sieve drum, reaches an annular area which is delimited radially inwards by the sieve drum and radially outwards by the housing jacket. The bulk material passes from this ring-shaped area into the separator, which tapers downwards in a funnel shape. The funnel-shaped constriction has the disadvantage that the bulk material is increasingly compressed and thus compressed during discharge in accordance with the increasing cross-sectional constriction of the outlet. This easily leads to blockages and to the tearing off of the bulk material flow because, due to the narrowing of the cross section and the compression of the bulk material, bridging occurs in the outlet, which prevents the bulk material from being transported away continuously.

Der Erfindung liegt die Aufgabe zugrunde, eine Siebmaschine dieser Art so auszubilden, daß das Schüttgut gleichmäßig und ohne Gefahr des Abreißens des Schüttgutstromes durch die Siebmaschine gefördert werden kann.The invention has for its object to design a screening machine of this type so that the bulk material evenly and without risk of tearing off the bulk material flow through the Screening machine can be promoted.

Diese Aufgabe wird bei der gattungsgemäßen Siebmaschine erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruches 1 gelöst.This object is achieved in the generic screening machine according to the invention with the characterizing features of claim 1.

Bei der erfindungsgemäßen Siebmaschine befindet sich im Transportweg des Schüttgutes nach dem Sieb die Zone mit dem verringerten statischen Druck. Das Schüttgut kann darum in optimaler Weise kontinuierlich gefördert werden. In dem an diese Zone verringerten statischen Drucks anschließenden Bereich kann sich das Schüttgut entspannen, weil sich der Bereich in Förderrichtung des Schüttgutes im Querschnitt erweitert. Dadurch wird eine Brücken- oder Dombildung im Schüttgut zuverlässig verhindert, so daß eine kontinuierliche Förderung des Schüttgutes gewährleistet ist. Damit das Schüttgut einwandfrei in den Auslaß gefördert werden kann, wird es mit Druckluft so beaufschlagt, daß es annähernd in der Schwebe gehalten wird. Hierzu wird Druckluft durch die luftdurchlässige Zuführung geblasen, deren Druck gleich der Gewichtskraft des Schüttgutes ist. Das Schüttgut kann darum vor dem Auslaß nicht verdichtet werden, so daß in diesem kritischen Bereich auf einfache Weise sichergestellt wird, daß das Schüttgut in lockerem Zustand gehalten wird. Mit der erfindungsgemäßen Siebmaschine wird erreicht, daß das Schüttgut kontinuierlich und ohne die Gefahr des Abreißens des Schüttgutstromes vom Einlaß durch die Siebmaschine bis zum Auslaß gefördert werden kann. Dadurch ist an der durch die Siebmaschine angeschlossenen Einrichtung eine kontinuierliche Zuführung des jeweiligen Schüttgutes sichergestellt.In the screening machine according to the invention, the zone with the reduced static pressure is located in the transport path of the bulk material after the screen. The bulk material can therefore be continuously conveyed in an optimal manner. The bulk material can relax in the area following this reduced static pressure because the area widens in cross-section in the conveying direction of the bulk material. This reliably prevents bridges or dome formation in the bulk material, so that continuous conveyance of the bulk material is ensured. So that the bulk material can be conveyed properly into the outlet, it is pressurized with compressed air in such a way that it is held approximately in suspension. For this purpose, compressed air is blown through the air-permeable feed, the pressure of which is equal to the weight of the bulk material. The bulk material can therefore not be compressed in front of the outlet, so that it is easily ensured in this critical area that the bulk material is kept in a loose state. With the screening machine according to the invention it is achieved that the bulk material can be conveyed continuously and without the risk of the bulk material flow being cut off from the inlet through the screening machine to the outlet. This ensures continuous feeding of the respective bulk material to the device connected by the screening machine.

Weitere Merkmale der Erfindung ergeben sich aus den weiteren Ansprüchen, der Beschreibung und den Zeichnungen.Further features of the invention result from the further claims, the description and the drawings.

Die Erfindung wird nachstehend anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher beschrieben. Es zeigt:

Fig. 1
eine in einen Förderkreis integrierte erfindungsgemäße Siebmaschine in Seitenansicht,
Fig. 2
die Siebmaschine gem. Fig. 1 im Axialschnitt,
Fig. 3
eine Darstellung entsprechend Fig. 2, jedoch in verkleinerter Darstellung und mit einer Austragsleitung.
The invention is described below with reference to an embodiment shown in the drawings. It shows:
Fig. 1
a side view of a screening machine according to the invention integrated into a conveyor circuit,
Fig. 2
the screening machine acc. 1 in axial section,
Fig. 3
a representation corresponding to FIG. 2, but in a reduced representation and with a discharge line.

In Fig. 1 ist eine Förderanlage 1 mit einer Siebmaschine 2 dargestellt, die in das Fördersystem integriert ist. Die Förderanlage bzw. das Fördersystem hat einen Luftverdichter 3, an den eine Förderleitung 4 angeschlossen ist. In ihr liegt ein Behältnis 7, in das von einem Silo 5 zugeführtes Schüttgut 6, vorzugsweise Mehl, gelangt. Das Schüttgut 6 wird von dem vom Luftverdichter 3 erzeugten Luftstrom in der Leitung 4 mitgerissen.In Fig. 1, a conveyor system 1 is shown with a screening machine 2, which is integrated in the conveyor system. The conveyor system or the conveyor system has an air compressor 3 to which a conveyor line 4 is connected. In it there is a container 7 into which bulk material 6, preferably flour, fed from a silo 5 arrives. The bulk material 6 is entrained in the line 4 by the air flow generated by the air compressor 3.

Die Leitung 4 ist mit einer Zuleitung 8, vorzugsweise mit einem Zuführrohr, der Siebmaschine 2 verbunden, zweckmäßig steckverbunden. Das Schüttgut 6 tritt aus der Zuleitung 8 in die Siebmaschine 2 ein, wird dort gesiebt und gelangt dann über eine Ableitung 9, vorzugsweise ein Auslaßrohr, in eine mit dieser verbundene Leitung 10 der Förderanlage 1. Über die Leitung 10 wird das gesiebte Fördergut einer weiteren (nicht dargestellten) Bearbeitungsstation, z. B. einer Waage, zugeführt.The line 4 is with a feed line 8, preferably with a feed pipe, connected to the screening machine 2, appropriately plug-in. The bulk material 6 enters the sieving machine 2 from the feed line 8, is sieved there and then passes via a discharge line 9, preferably an outlet pipe, into a line 10 of the conveyor system 1 connected thereto. Via line 10, the sieved material to be conveyed is another Processing station (not shown), e.g. B. a scale supplied.

Die Siebmaschine 2 hat ein Gehäuse 11, 12, 13 mit einem napfförmigen Gehäuseunterteil 11, einer zylindrischen Gehäusewand 12 und einem Gehäuseoberteil 13 mit einem Lagerdeckel 13a. Im Gehäuseoberteil 13 und im Lagerdeckel 13a ist eine Antriebswelle 14 gelagert, die von einem Motor 15 über ein Ritzel 16 und eine Zwischenwelle 16a drehbar angetrieben wird. Der Motor ist über einen Lagerwinkel 17 auf dem Oberteil 13 befestigt.The screening machine 2 has a housing 11, 12, 13 with a cup-shaped housing lower part 11, a cylindrical housing wall 12 and an upper housing part 13 with a bearing cover 13a. A drive shaft 14 is mounted in the upper housing part 13 and in the bearing cover 13a and is rotatably driven by a motor 15 via a pinion 16 and an intermediate shaft 16a. The motor is attached to the upper part 13 via a bearing bracket 17.

Der napfförmige Gehäuseunterteil 11 hat eine zentrale Durchtrittsöffnung 18, die von einer Ringwand 19 begrenzt ist und an die von außen ein Fallrohr 23 anschließt, dessen Innendurchmesser im Anschlußbereich gleich dem Durchmesser der Durchtrittsöffnung 18 ist. Die Ringwand liegt koaxial zur höheren Außenwand 20 des Gehäuseunterteiles 11. Am Boden 21 des Unterteiles 11 ist eine Ringscheibe 22 befestigt, mit der das nach unten aus dem Gehäuse ragende Fallrohr 23 am Gehäuseunterteil 11 gehalten ist. Das Fallrohr 23 ragt schräg nach außen und weist eine Durchtrittsöffnung 24 auf, durch die das Anschlußrohr 8 abgedichtet nach außen ragt. Es wird in einem mittleren Bereich vom oberen kurzen, abgebogenen Abschnitt 25 des Fallrohrs 23 mit Abstand umgeben. Das Fallrohr 23 ist im Ausführungsbeispiel unter einem Winkel von etwa 45° gegenüber dem Anschlußrohr 8 geneigt und von seinem unteren Ende 26 mit einem (nicht näher dargestellten) Schnellverschluß 27 verschlossen. Im Fallrohr 23 wird in einem Sieb 28 im Gehäuse 11 bis 13 zurückgehaltenes Material gesammelt und bei Bedarf aus dem Fallrohr entleert.The cup-shaped lower housing part 11 has a central passage opening 18 which is delimited by an annular wall 19 and to which a downpipe 23 connects from the outside, the inside diameter of which in the connection area is equal to the diameter of the passage opening 18. The ring wall lies coaxially with the higher outer wall 20 of the lower housing part 11. On the bottom 21 of the lower part 11, an annular disk 22 is fastened, with which the down pipe 23 projecting downward from the housing is held on the lower housing part 11. The downpipe 23 protrudes obliquely outwards and has a passage opening 24, through which the connecting tube 8 projects outwards in a sealed manner. It is surrounded by the upper short, bent section 25 of the downpipe 23 at a distance in a central region. The downpipe 23 is in the embodiment under one Angled at an angle of approximately 45 ° with respect to the connecting pipe 8 and closed from its lower end 26 with a quick-release fastener 27 (not shown in more detail). In the downpipe 23, material retained in a casing 28 in the housing 11 to 13 is collected and, if necessary, emptied from the downpipe.

Auf dem Gehäuseunterteil 11 sitzt ein ringförmiges Fließbett 29, das mit radial nach außen abstehenden, umlaufenden Rändern 30, 31 auf einer Schulter 32 der äußeren Wand 20 bzw. auf der Stirnseite 33 der Ringwand 19 aufliegt. Der Rand 31 ist zwischen der Stirnseite 33 der Ringwand 19 und einem Ring 34 eingespannt. Der andere Rand 30 ist zwischen der Schulter 32 und einem weiteren, den Ring 34 koaxial umgebenden Ringteil 35 befestigt.An annular fluidized bed 29 is seated on the lower housing part 11 and rests with radially outwardly projecting peripheral edges 30, 31 on a shoulder 32 of the outer wall 20 or on the end face 33 of the annular wall 19. The edge 31 is clamped between the end face 33 of the ring wall 19 and a ring 34. The other edge 30 is fastened between the shoulder 32 and a further ring part 35 coaxially surrounding the ring 34.

Der Ringteil 35 hat einen Außenmantel 36, der nahe der Stirnseite der äußeren Wand 20 des Gehäuseunterteiles 11 eine radial nach außen gerichtete, umlaufende Schulterfläche 36a aufweist, auf der das untere Ende des zylindrischen Gehäuseteiles 12 aufliegt. Die radiale Breite der Schulterfläche 36a entspricht vorzugsweise der Dicke des zylindrischen Gehäuseteiles 12. Der Ringteil 35 liegt im Bereich oberhalb der Schulterfläche 36a an der Innenwand des Gehäuseteiles 12 an, das dadurch im unteren Bereich zweckmäßig abgestützt wird.The ring part 35 has an outer jacket 36, which has a radially outwardly directed, circumferential shoulder surface 36a near the end face of the outer wall 20 of the lower housing part 11, on which the lower end of the cylindrical housing part 12 rests. The radial width of the shoulder surface 36a preferably corresponds to the thickness of the cylindrical housing part 12. The ring part 35 lies in the region above the shoulder surface 36a on the inner wall of the housing part 12, which is thereby appropriately supported in the lower region.

Mit seinem oberen Ende 37 ragt der Gehäuseteil 12 in eine Ringschulter 38 an der Unterseite des Oberteiles 13. Der Gehäuseteil 12 ist in den Ringschultern 36a und 37 mit Anpreßringen 39, 40, radial gesichert und gehalten, die an einen Ringflansch 41 des Gehäuseunterteiles 11 bzw. am Deckelrand 42 verschraubt sind.With its upper end 37, the housing part 12 protrudes into an annular shoulder 38 on the underside of the upper part 13. The housing part 12 is radially secured and held in the annular shoulders 36a and 37 with pressure rings 39, 40, which are connected to an annular flange 41 of the lower housing part 11 or are screwed to the lid edge 42.

Der Ringteil 35 hat vorzugsweise etwa dreieckigen Querschnitt, dessen Dreieckspitze 35a radial nach innen weist. Dadurch hat der Ringteil 35 in Höhe der Dreieckspitze seine kleinste lichte Weite und erweitert sich von dort aus nach oben und unten. Auf diese Weise wird im Bereich oberhalb der umlaufenden Dreickspitze 35a ein nach unten sich verjüngender und im Bereich unterhalb ein nach unten sich erweiternder Ringraum 43 und 44 gebildet. Der obere Ringraum 43 hat geringfügig größere Höhe als der untere Ringraum 44. Durch die zwischen diesen Räumen 43, 44 gebildete Verengung 45 bildet der Ringteil 35 eine Art Injektordüse, wie noch erläutert wird. Der Ring 34 liegt benachbart zum unteren Ringraum 44.The ring part 35 preferably has an approximately triangular cross section, the triangular tip 35a of which points radially inwards. As a result, the ring part 35 has its smallest clear width at the level of the triangle tip and widens from there upwards and downwards. In this way, an annular space 43 and 44 which tapers downward and in the area below which extends downward is formed in the area above the circumferential triangular tip 35a. The upper annular space 43 has a slightly greater height than the lower annular space 44. The narrowing 45 formed between these spaces 43, 44 means that the annular part 35 forms a type of injector nozzle, as will be explained. The ring 34 is adjacent to the lower annular space 44.

Die Antriebswelle 14 ragt mit einem verbreiterten Endabschnitt 14a in das obere Ende 50a eines rohrförmigen Tragkörpers 50 einer Ringbürste 51 der Siebmaschine 2. In das untere Ende 56 des Tragkörpers 50 ragt mit Spiel das Anschlußrohr 8 mit seinem freien Ende 57. Der Tragkörper 50 weist mehrere als axiale Längsschlitze ausgebildete Durchtrittsöffnungen 47, 48 für das zu siebende Schüttgut auf.The drive shaft 14 projects with a widened end section 14a into the upper end 50a of a tubular support body 50 of an annular brush 51 of the screening machine 2. The connecting tube 8 with its free end 57 projects into the lower end 56 of the support body 50 with play. The support body 50 has several through openings 47, 48 designed as axial longitudinal slots for the bulk material to be screened.

Die Durchtrittsöffnungen sind vorzugsweise in Reihen übereinander und mit umfangsseitigem Abstand hintereinander angeordnet, so daß der Tragkörper 50 trotz der Durchtrittsöffnungen 47, 48 noch eine ausreichende Festigkeit hat. Die Durchtrittsöffnungen 47, 48 erstrecken sich jeweils nahezu über die halbe Höhe des Tragkörpers 50. In Höhe der oberen Hälfte der oberen Durchtrittsöffnungen 48 weist die Antriebswelle 14 an ihrem unteren Ende 14a einen nach unten ragenden Umlenkteil 49 für das Fördergut auf, der sich nach unten kegelartig verjüngt. Wie Fig. 2 zeigt, ist die Mantelfläche 49a des Umlenkteiles 49 im Querschnitt konkav gekrümmt.The passage openings are preferably arranged in rows one above the other and one behind the other with circumferential spacing, so that the support body 50 still has sufficient strength despite the passage openings 47, 48. The passage openings 47, 48 each extend almost over half the height of the support body 50. At the level of the upper half of the upper passage openings 48, the drive shaft 14 has at its lower end 14a a downwardly deflecting deflection part 49 for the material to be conveyed, which downwards tapered like a cone. 2 shows the lateral surface 49a of the deflection part 49 is concavely curved in cross section.

An der Außenseite des Tragkörpers 40 sind (nicht dargestellte) Borstenleisten mit Borstenbüscheln befestigt, deren freie Enden bis nahe an das zylindrische Sieb 28 reichen. Es besteht vorzugsweise aus einem gelochten Metallblech. Das Sieb 28 ist vorzugsweise an seinem oberen Ende 28a mit einem am Gehäuseoberteil 13 befestigten Klemmring 13b radial gegen eine Schulter 13c des Gehäuses 13 geklemmt.Bristle strips (not shown) are attached to the outside of the supporting body 40 with tufts of bristles, the free ends of which extend close to the cylindrical sieve 28. It preferably consists of a perforated metal sheet. The screen 28 is preferably clamped radially against a shoulder 13c of the housing 13 at its upper end 28a with a clamping ring 13b fastened to the upper housing part 13.

Das untere Ende des Siebes 28 ist auf dem Außenmantel 52 des auf dem Gehäuseunterteil befestigten Ringes 34 befestigt. Der obere Rand 53 des Ringes 34 liegt etwa in Höhe der Verengung 45. An diesen Rand 53 schließt radial nach innen eine schräg nach unten und etwa bis über die halbe Höhe des Ringes verlaufende Kegelmantelfäche 55 an. Sie erstreckt sich nach oben bis über das untere Ende 56 des Tragkörpers 50. Auf der Kegelmantelfläche 55 können die ausgesiebten Partikel leicht nach unten in das Fallrohr 23 rutschen.The lower end of the sieve 28 is fastened on the outer casing 52 of the ring 34 fastened on the lower housing part. The upper edge 53 of the ring 34 lies approximately at the level of the constriction 45. This edge 53 is adjoined radially inwards by a conical surface 55 which extends obliquely downwards and approximately up to half the height of the ring. It extends up to over the lower end 56 of the support body 50. On the conical surface 55, the sieved particles can easily slide down into the downpipe 23.

Das obere Ende 57 des Anschlußrohres 8 liegt in Höhe des unteren Randes 58 der unteren Längsschlitze 47.The upper end 57 of the connecting pipe 8 lies at the level of the lower edge 58 of the lower longitudinal slots 47.

Das zwischen seinen Rändern 31, 32 im Querschnitt teilkreisförmig gekrümmte Fließbett 29 schließt mit seiner Innenseite unmittelbar an den zylindrischen Außenmantel 52 des Ringes 34 und die untere, auf einer Kegelmantelfläche liegende Innenwand 61 des Ringteiles 35 an. Im Fließbett 29 wird das gesiebte Gut zum Weitertransport durch das Auslaßrohr 9 (Fig. 1) und die Leitung 10 gesammelt.The fluid bed 29, which is partially circular in cross section between its edges 31, 32, connects with its inner side directly to the cylindrical outer jacket 52 of the ring 34 and the lower inner wall 61 of the ring member 35 lying on a conical jacket surface. The screened material is collected in the fluidized bed 29 for further transport through the outlet pipe 9 (FIG. 1) and the line 10.

Zum Sieben wird das Fördergut, insbesondere Mehl, über das Silo 6 und das Behältnis 7 in die Förderleitung 4 eingebracht. Dort wird das Fördergut mittels des durch den Luftverdichter 3 erzeugten Druckluftstromes zur Siebmaschine 2 transportiert, in der es gesiebt und dann in einem Förderkreis der Förderanlage weiterbefördert wird. Anstelle dieser Überdruckförderung kann in der Förderlage 1 auch ein Saugstrom erzeugt werden, mit dem das Fördergut durch Unterdruck transportiert wird. In diesem Fall befindet sich die entsprechende Pumpe in Strömungsrichtung des Fördergutes hinter der Siebmaschine 2.The material to be conveyed, in particular flour, is introduced into the conveying line 4 via the silo 6 and the container 7 for sieving. There the material to be conveyed is transported by means of the compressed air flow generated by the air compressor 3 to the screening machine 2, in which it is screened and then conveyed on in a conveyor circuit of the conveyor system. Instead of this overpressure conveying, a suction flow can also be generated in the conveying position 1, with which the material to be conveyed is transported by underpressure. In this case, the corresponding pump is located behind the screening machine 2 in the flow direction of the conveyed material.

Von der Leitung 4 gelangt das zu siebende Mehl über das Anschlußrohr 8 in die Bürstenvorrichtung 51. Das Fördergut tritt somit in vertikaler Richtung von unten in die Siebmaschine 2 bzw. in Achsrichtung der Bürstenvorrichtung der Siebmaschine ein. Durch die Durchtrittsöffnungen 47, 48 des Tragkörpers 50 gelangt das Fördergut in einen Bürstenraum 70 zwischen dem Sieb 28 und dem Tragkörper 50, in dem die Borsten umlauf en und in dem das zu siebende Gut durchkämmt wird. Da der Umlenkteil 49 spitz ausläuft und seine Mantelfläche im Querschnitt konkav gekrümmt ist, wird der vertikal von unten nach oben gerichtete Förderstrom optimal in etwa horizontale Richtung umgelenkt und aufgeteilt, so daß der abgelenkte Förderstrom einwandfrei durch die Durchtrittsöffnungen 47, 48 strömen kann.From the line 4, the flour to be sieved enters the brushing device 51 via the connecting pipe 8. The material to be conveyed thus enters the screening machine 2 in the vertical direction from below or in the axial direction of the brushing device of the screening machine. The material to be conveyed passes through the openings 47, 48 of the support body 50 into a brush chamber 70 between the screen 28 and the support body 50, in which the bristles circulate and in which the material to be screened is combed. Since the deflecting part 49 ends in a pointed shape and its lateral surface is concavely curved in cross section, the vertically directed upward flow is optimally deflected and divided approximately in a horizontal direction so that the deflected flow can flow properly through the passage openings 47, 48.

Durch die Rotation der Antriebswelle 14 bzw. Bürste 51 und die Ausbildung und Formgebung des Bürstenraumes 70 wird dabei der Förderstrom in horizontaler Richtung umgelenkt, so daß das im umgelenkten Förderstrom enthaltene Fördergut durch das zylinderförmige Sieb 28 gedrückt und dabei gesiebt wird. Das ausgesiebte Material kann aufgrund des Überdruckes in der Förderleitung 4 und im Zuführkanal 60 der Bürste 51 nicht wieder zurück in die Zuführleitung strömen. Es wird vielmehr an der Siebinnenwand 28a aufgrund seines Eigengewichtes und der Drehbewegung der Bürste 51 nach unten in das Fallrohr 23 abgelenkt. Dort kann es bei Bedarf entleert werden, wozu lediglich der (nicht dargestellte) Schnellverschluß 27 geöffnet werden muß. Das Fallrohr wird anschließend wieder mit dem Schnellverschluß verschlossen, wodurch im Fördersystem ein Druckverlust vermieden ist.Due to the rotation of the drive shaft 14 or brush 51 and the design and shape of the brush chamber 70, the flow is deflected in the horizontal direction, so that the conveyed material contained in the deflected flow is pressed through the cylindrical sieve 28 and sieved in the process. The screened material cannot flow back into the feed line due to the excess pressure in the delivery line 4 and in the feed channel 60 of the brush 51. Rather, it is deflected downward into the downpipe 23 on the inner wall 28a of the sieve due to its own weight and the rotary movement of the brush 51. There it can be emptied if necessary, for which purpose only the quick release (not shown) 27 has to be opened. The downpipe is then closed again with the quick-release fastener, which prevents pressure loss in the conveyor system.

Nach dem Bürsten im Bürstenraum 70 und Passieren des Siebes 28 gelangt das Fördergut in den radial nach außen anschließenden Siebraum 71 zwischen dem Sieb 28 und dem Gehäuseteil 12. Im Siebraum 71 fällt das Fördergut, unterstützt durch den Druckluftstrom, vom oberen Ringraum 43 über die Verengung 45 in den nach unten anschließenden Ringraum 44 und damit in das Fließbett 29. Es ist am unteren Ende des Siebmantels bzw. der Zylinderwand 12 des Gehäuses 11, 12, 13 angebracht. Das Fließbett 29 besteht aus luftdurchlässigem Material, wie gesintertem Polyethylen. Es wird von unten mit Druckluft belüftet. Die durch das Fließbett nach oben sickernde Luft unterstützt das Zurückführen von im Fließbett gesammeltem Fördergut in den Förderstrom.After brushing in the brush chamber 70 and passing through the sieve 28, the material to be conveyed enters the sieve space 71, which adjoins the radially outward, between the sieve 28 and the housing part 12 45 into the annular space 44 adjoining at the bottom and thus into the fluidized bed 29. It is attached to the lower end of the screen jacket or the cylinder wall 12 of the housing 11, 12, 13. The fluidized bed 29 is made of an air-permeable material, such as sintered polyethylene. It is ventilated with compressed air from below. The air seeping upwards through the fluidized bed supports the return of conveyed material in the fluidized bed into the flow.

Aufgrund der Formgebung des Fließbettes 29 und des Querschnittes der darüberliegenden In j ektordüse 35 kann das Fördergut nicht wieder in den Siebraum 21 zurückgelangen. Die Injektordüse 35 führt zu einer Erhöhung der Strömungsgeschwindigkeit und zu einer Erniedrigung des statischen Druckes, wodurch die Förderung des Gutes erleichtert wird. Durch den Förderdruck, der das Fördergut durch die Injektordüse 35 drückt, wird das Fördergut im Fließbett 29 gezwungen, in Fließrichtung (Pfeil 73 in Fig. 3) in das Auslaßrohr 9, also in Richtung des geringeren Druckes, zu fließen.Due to the shape of the fluidized bed 29 and the cross section of the overlying injector nozzle 35, the material to be conveyed cannot get back into the screen space 21. The injector nozzle 35 leads to an increase in the flow velocity and a lowering of the static pressure, which facilitates the promotion of the good. The conveying pressure, which presses the conveyed material through the injector nozzle 35, forces the conveyed material in the fluidized bed 29 to flow in the direction of flow (arrow 73 in FIG. 3) into the outlet pipe 9, that is to say in the direction of the lower pressure.

Zur Erläuterung des Förderdruckes (Fig. 3) wird das gesamte Fördersystem als statisch betrachtet, d. h. die gesamte Druckverteilung in der Siebmaschine 2 wird als Momentaufnahme und somit als statisch angesehen. Der Förderstrom bleibt also unberücksichtigt.To explain the delivery pressure (Fig. 3), the entire delivery system is considered static, i. H. the entire pressure distribution in the screening machine 2 is regarded as a snapshot and thus as static. The flow rate is therefore not taken into account.

Für die Druckverteilung in der Siebmaschine gilt, daß der Druck P 1, der im Anschlußrohr 8 und im Tragkörper 50 herrscht, größer ist als der Druck P 2 im Bürstenraum 70. Er ist wiederum größer als der im Siebraum 71 herrschende Druck P3 der größer ist als der Druck P4 im Ringraum 43. Er ist größer als der Druck P6 im Austrittsrohr 9. Es gilt also die Bedingung: P1 > P2 > P3 > P4 > P6.For the pressure distribution in the screening machine, the pressure P 1 which prevails in the connecting pipe 8 and in the support body 50 is greater than the pressure P 2 in the brush chamber 70. It is again greater than the pressure P3 prevailing in the screen chamber 71 which is greater than the pressure P4 in the annular space 43. It is greater than the pressure P6 in the outlet pipe 9. The condition therefore applies: P1> P2> P3> P4> P6.

Der Druck P5 unterhalb des Fließbettes 29 ist gleich der Gewichtskraft des Fördergutes. Dadurch kann das Fördergut im Fließbett 29 annähernd in der Schwebe gehalten werden, so daß es leicht zum Auslaßrohr 9 gefördert werden kann.The pressure P5 below the fluidized bed 29 is equal to the weight of the material being conveyed. As a result, the material to be conveyed can be kept approximately in suspension in the fluidized bed 29, so that it can easily be conveyed to the outlet pipe 9.

Mit der beschriebenen Siebmaschine 2 kann innerhalb des Fördersystems 1 eine Schutzsiebung des Fördergutes, insbesondere Mehles, erreicht werden, wie sie immer häufiger von Bäckereien und dgl. gefordert wird.With the described screening machine 2, a protective screening of the conveyed material, in particular flour, can be achieved within the conveyor system 1, as is increasingly required by bakeries and the like.

Nach dem Austritt aus dem Auslaßrohr 9 der Siebmaschine 2 gelangt das gesiebte Gut in eine weitere Förderleitung 10 der Fördervorrichtung 1, in der es im Förderstrom weiterbefördert wird. Beispielsweise gelangt das gesiebte Gut dann zu einer Waage oder einer ähnlichen Einrichtung, in der das Schüttgut bzw. Mehl weiterverarbeitet werden kann.After exiting the outlet pipe 9 of the screening machine 2 the sieved material arrives in a further conveying line 10 of the conveying device 1, in which it is conveyed further in the conveying flow. For example, the sifted good then arrives at a balance or similar facility in which the bulk material or flour can be processed further.

Claims (12)

  1. A screening machine for bulk material, in particular flour, having an inlet for the bulk material, behind which is arranged a screen (28) through which the bulk material can be fed by means of an air flow, and behind which is arranged an outlet (9) for the screened bulk material, characterised in that a zone (constriction 45) of reduced static pressure lies in the feed path of the bulk material after the screen (28), a feed region (lower annular chamber 44) of increasing cross-section adjoining the said zone (45) in the feed direction, and in that the weight of the bulk material in front of the outlet (9) is at least approximately equal to the opposing pressure (P5) of compressed air below a means for conveying (fluidised bed 29) the bulk material to the outlet (9), the said conveying means (29) comprising air-permeable material.
  2. A machine according to claim 1, characterised in that the zone (45) of reduced static pressure is formed by an injector nozzle (35).
  3. A machine according to claim 2, characterised in that the injector nozzle (35) is formed by an annular part, the wall of which preferably has a substantially triangular cross-section with the point (35a) of the triangle pointing radially inwards, and annular chambers (43, 44) widening against or in the feed direction in the manner of a funnel are formed, respectively, above and below the horizontal plane containing the point (35a) of the triangle, the annular chamber widening in the feed direction forming the region (44) of increasing cross-section.
  4. A machine according to claim 3, characterised in that the zone (45) of reduced static pressure in the region of the point (35a) of the triangle is formed by an injector nozzle constriction which is located at the level of an upper edge (53) of a ring (34) which is positioned on a lower housing part (11) and into which a discharge pipe (26) opens which is closeable by a snap closure (27).
  5. A machine according to any one of claims 1 to 4, characterised in that the conveying means (29) is formed as a fluidised bed for the bulk material, preferably comprises sintered polyethylene and is formed as a circumferential channel with a substantially semi-circular cross-section.
  6. A machine according to any one of claims 1 to 5, characterised in that the outlet (9) is arranged at the level of the conveying means (29) on the screening machine housing (11 to 13) and preferably extends horizontally.
  7. A machine according to any one of claims 1 to 6, characterised in that the screen (28) is part of a screening arrangement which has a rotating brush (51) with a tubular supporting body (50) for bristle bars, the said supporting body (50) being connected to a motor-driven drive shaft (14) and having longitudinal slits (47, 48) extending in the axial direction for the passage of the feed flow.
  8. A machine according to claim 7, characterised in that the drive shaft (14) with a deflection element (49) projects into the upper end (50a) of the supporting body (50), the surface (49a) of the said deflection element (49) being of concave cross-section for deflecting the bulk material outwards through the longitudinal slits (48).
  9. A machine according to claim 7 or 8, characterised in that the inlet pipe (8) projects into the lower end (56) of the supporting body (50), the axis of the said inlet pipe (8) being in alignment with the axis of the drive shaft (14).
  10. A machine according to any one of claims 7 to 9, characterised in that the bristles of the brush (51) rotate in a brush chamber (70) which is surrounded by the screen (28) and a radially adjacent screen chamber (71) which is bounded radially outwards by a housing wall (12).
  11. A machine according to any one of claims 1 to 10, characterised in that the pressure (P1), which prevails in the connecting pipe (8) and in the supporting body (50), is greater than the pressure (P2) in the brush chamber (70), which is greater than the pressure (P3) in the screen chamber, and in that the pressure (P3) in the screen chamber (71) is greater than the pressure (P4) in the annular chamber (43), which is greater than the pressure (P6) in the outlet (9).
  12. A machine according to any one of claims 1 to 11, characterised in that its axis extends upwards.
EP89120166A 1988-11-03 1989-10-31 Screening machine for bulk material Expired - Lifetime EP0367213B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89120166T ATE103846T1 (en) 1988-11-03 1989-10-31 SCREEN FOR BULK MATERIAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837346A DE3837346A1 (en) 1988-11-03 1988-11-03 SCREENING MACHINE FOR SCHUETTGUT
DE3837346 1988-11-03

Publications (3)

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EP0367213A2 EP0367213A2 (en) 1990-05-09
EP0367213A3 EP0367213A3 (en) 1991-09-04
EP0367213B1 true EP0367213B1 (en) 1994-04-06

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EP89120166A Expired - Lifetime EP0367213B1 (en) 1988-11-03 1989-10-31 Screening machine for bulk material

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US (1) US4995966A (en)
EP (1) EP0367213B1 (en)
AT (1) ATE103846T1 (en)
DE (2) DE3837346A1 (en)
ES (1) ES2050757T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1269841B (en) * 1994-05-27 1997-04-15 Himont Inc PROCEDURE AND DEVICE FOR THE CLASSIFICATION OF SOLID PARTICLES
DE10018908C2 (en) * 2000-04-16 2002-10-10 Goetz R Ohg Flour screening machine
US20060163118A1 (en) * 2005-01-26 2006-07-27 Eastman Kodak Company Particulate separation processes and apparatus
US9643800B2 (en) 2013-02-23 2017-05-09 Phillip Douglas Horizontal support system
US10106338B2 (en) * 2013-02-23 2018-10-23 Phillip Allan Douglas Material separator for a vertical pneumatic system
CN116812596A (en) * 2023-07-11 2023-09-29 合肥格瑞塑胶有限公司 Plastic granules stirring conveying equipment

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Publication number Priority date Publication date Assignee Title
US1037223A (en) * 1912-04-06 1912-09-03 George F Thompson Cotton elevator and distributer.
DE867193C (en) * 1951-05-12 1953-02-16 Muehlenbau Ges Friedrich Liebe Process for separating flour and bran or flour and meal
US3547267A (en) * 1967-12-27 1970-12-15 Douglas G Sutherland Straining apparatus
DE1939401A1 (en) * 1969-08-02 1971-02-11 Miag Muehlenbau & Ind Gmbh Air-separation apparatus for fine grain - products
DE2338909A1 (en) * 1973-08-01 1975-04-17 Zimmermann Azo Maschf SCREENING MACHINE
US4042503A (en) * 1973-12-10 1977-08-16 Beloit Corporation Classifier and process for recycled fiber separation
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US4205931A (en) * 1978-12-04 1980-06-03 Combustion Engineering, Inc. Pneumatic ash transporting and containing system
FR2575734B1 (en) * 1985-01-08 1989-11-17 Pechiney Aluminium REGULATED FLOW DISPENSING DEVICE OF A FLUIDISABLE POWDER MATERIAL
US4810270A (en) * 1985-10-24 1989-03-07 Kimberly-Clark Corporation Separator

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Publication number Publication date
DE58907397D1 (en) 1994-05-11
US4995966A (en) 1991-02-26
ATE103846T1 (en) 1994-04-15
DE3837346A1 (en) 1990-05-10
DE3837346C2 (en) 1990-09-13
EP0367213A2 (en) 1990-05-09
EP0367213A3 (en) 1991-09-04
ES2050757T3 (en) 1994-06-01

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