EP0367213B1 - Machine de tamisage de matériaux en vrac - Google Patents

Machine de tamisage de matériaux en vrac 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
Authority
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)
English (en)
Other versions
EP0367213A3 (fr
EP0367213A2 (fr
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IBV
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IBV
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Filing date
Publication date
Application filed by IBV filed Critical IBV
Priority to AT89120166T priority Critical patent/ATE103846T1/de
Publication of EP0367213A2 publication Critical patent/EP0367213A2/fr
Publication of EP0367213A3 publication Critical patent/EP0367213A3/fr
Application granted granted Critical
Publication of EP0367213B1 publication Critical patent/EP0367213B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

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

Claims (12)

  1. Machine de tamisage pour matériaux en vrac, en particulier de la farine, comprenant une entrée pour le matériau en vrac, à la suite de laquelle est monté un tamis (28) à travers lequel le matériau en vrac peut être entrîné au moyen d'un courant d'air, et à la suite duquel est prévue une sortie (9) pour le matériau en vrac tamisé,
    caractérisée en ce qu'il est prévu dans le trajet d'entraînement du matériau en vrac et après le tamis (28) une zone (rétrécissement 45) à pression statique réduite, à laquelle se raccorde dans la direction d'entraînement une zone d'entraînement (chambre annulaire inférieure 44) avec une section croissante, et en ce que le poids du matériau en vrac avant la sortie (9) est au moins approximativement égal à la pression opposée (P5) de l'air comprimé au-dessous d'une alimentation (lit fluidisé 29), réalisée en un matériau perméable à l'air, pour le matériau en vrac en direction de la sortie (9).
  2. Machine selon la revendication 1, caractérisée en ce que la zone (45) à pression statique réduite est formée par une buse d'injecteur (35).
  3. Machine selon la revendication 2, caractérisée en ce que la buse d'injecteur (35) est formée par une pièce annulaire dont la paroi a de préférence une section transversale à peu près triangulaire, dont le sommet (35a) est dirigé radialement vers l'intérieur, et en ce qu'au-dessus et au-dessous du plan horizontal qui contient le sommet (35a) du triangle, il est formé à chaque fois une chambre annulaire (43, 44) qui s'élargit en forme d'entonnoir en sens opposé ou dans le même sens que la direction d'entraînement, parmi lesquelles la chambre annulaire qui s'élargit dans la direction d'entraînement forme la zone (44) à section croissante.
  4. Machine selon la revendication 3, caractérisée en ce que la zone (45) à pression statique réduite formée dans la région du sommet (35a) du triangle est formée par un rétrécissement d'une buse d'injecteur, lequel se trouve à la hauteur d'un bord supérieur (53) d'un anneau (34) qui repose sur une partie inférieure (11) de boîtier, dans laquelle débouche un tube d'évacuation (26), lequel peut être obturé au moyen d'une fermeture rapide (27).
  5. Machine selon l'une quelconque des revendications 1 à 4, caractérisée en ce que l'alimentation (29) est réalisée sous la forme d'un lit fluidisé pour le matériau en vrac, cette alimentation étant de préférence réalisée en polyéthylène fritté et sous la forme d'une goulotte périphérique avec une section à peu près en forme de demi-cercle.
  6. Machine selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la sortie (9) est agencée sur le boîtier (11 à 13) de la machine à la hauteur de l'alimentation (29) et s'étend de préférence horizontalement.
  7. Machine selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le tamis (28) fait partie d'un dispositif de tamisage qui possède une brosse (51) entraînée en rotation avec un corps de support tubulaire (50) pour des barrettes à brosse, corps qui est relié à un arbre d'entraînement (14) mû par un moteur et qui présente des fentes longitudinales (47, 48) s'étendant dans la direction axiale pour le passage du courant d'entraînement.
  8. Machine selon la revendication 7, caractérisée en ce que l'arbre d'entraînement (14) pénètre par l'intermédiaire d'un corps de déflexion (49) dans l'extrémité supérieure (50a) du corps de support (50), lequel présente une surface enveloppe (49a) incurvée en coupe de manière concave afin de renvoyer le matériau en vrac vers l'extérieur à travers les fentes longitudinales (48).
  9. Machine selon l'une ou l'autre des revendications 7 et 8, caractérisée en ce que la conduite d'entrée (8) pénètre dans l'extrémité inférieure (56) du corps de support (50), l'axe de ladite conduite étant aligné avec l'axe de l'arbre d'entraînement (14).
  10. Machine selon l'une quelconque des revendications 7 à 9, caractérisée en ce que les poils de la brosse (51) circulent dans une chambre à brosse (70) qui est entourée par le tamis (28) et par une chambre de tamis (71) qui fait suite radialement à l'extérieur et qui est délimitée radialement à l'extérieur par une paroi (12) de boîtier.
  11. Machine selon l'une quelconque des revendications 1 à 10, caractérisée en ce que la pression (P1) qui règne dans la conduite d'entrée (8) dans le corps de support (50) est supérieure à la pression (P2) dans la chambre de brosse (70), laquelle est supérieure à la pression (P3) dans la chambre de tamis, et en ce que la pression (P3) dans la chambre de tamis (71) est supérieure à la pression (P4) dans la chambre annulaire (43), laquelle est supérieure à la pression (P6) à la sortie (9).
  12. Machine selon l'une quelconque des revendications 1 à 11, caractérisée en ce que son axe est dirigé vers le haut.
EP89120166A 1988-11-03 1989-10-31 Machine de tamisage de matériaux en vrac Expired - Lifetime EP0367213B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89120166T ATE103846T1 (de) 1988-11-03 1989-10-31 Siebmaschine fuer schuettgut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837346A DE3837346A1 (de) 1988-11-03 1988-11-03 Siebmaschine fuer schuettgut
DE3837346 1988-11-03

Publications (3)

Publication Number Publication Date
EP0367213A2 EP0367213A2 (fr) 1990-05-09
EP0367213A3 EP0367213A3 (fr) 1991-09-04
EP0367213B1 true EP0367213B1 (fr) 1994-04-06

Family

ID=6366420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89120166A Expired - Lifetime EP0367213B1 (fr) 1988-11-03 1989-10-31 Machine de tamisage de matériaux en vrac

Country Status (5)

Country Link
US (1) US4995966A (fr)
EP (1) EP0367213B1 (fr)
AT (1) ATE103846T1 (fr)
DE (2) DE3837346A1 (fr)
ES (1) ES2050757T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1269841B (it) * 1994-05-27 1997-04-15 Himont Inc Procedimento e dispositivo per la classificazione di particelle solide
DE10018908C2 (de) * 2000-04-16 2002-10-10 Goetz R Ohg Siebmaschine für Mehl
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

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1037223A (en) * 1912-04-06 1912-09-03 George F Thompson Cotton elevator and distributer.
DE867193C (de) * 1951-05-12 1953-02-16 Muehlenbau Ges Friedrich Liebe Verfahren zum Trennen von Mehl und Kleie oder Mehl und Schrot
US3547267A (en) * 1967-12-27 1970-12-15 Douglas G Sutherland Straining apparatus
DE1939401A1 (de) * 1969-08-02 1971-02-11 Miag Muehlenbau & Ind Gmbh Vorrichtung zum Sichten von Feinkorngut
DE2338909A1 (de) * 1973-08-01 1975-04-17 Zimmermann Azo Maschf Siebmaschine
US4042503A (en) * 1973-12-10 1977-08-16 Beloit Corporation Classifier and process for recycled fiber separation
US3996015A (en) * 1974-12-16 1976-12-07 Uop Inc. Catalytic reactor with dirt trap
US4205931A (en) * 1978-12-04 1980-06-03 Combustion Engineering, Inc. Pneumatic ash transporting and containing system
FR2575734B1 (fr) * 1985-01-08 1989-11-17 Pechiney Aluminium Dispositif de distribution a debit regule d'une matiere pulverulente fluidisable
US4810270A (en) * 1985-10-24 1989-03-07 Kimberly-Clark Corporation Separator

Also Published As

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

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