EP0641264B1 - Crible de controle et procede de criblage de controle - Google Patents

Crible de controle et procede de criblage de controle Download PDF

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Publication number
EP0641264B1
EP0641264B1 EP94908243A EP94908243A EP0641264B1 EP 0641264 B1 EP0641264 B1 EP 0641264B1 EP 94908243 A EP94908243 A EP 94908243A EP 94908243 A EP94908243 A EP 94908243A EP 0641264 B1 EP0641264 B1 EP 0641264B1
Authority
EP
European Patent Office
Prior art keywords
sieve
quality
mesh
control
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
EP94908243A
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German (de)
English (en)
Other versions
EP0641264A1 (fr
Inventor
Alois Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buehler AG
Original Assignee
Buehler AG
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Filing date
Publication date
Application filed by Buehler AG filed Critical Buehler AG
Publication of EP0641264A1 publication Critical patent/EP0641264A1/fr
Application granted granted Critical
Publication of EP0641264B1 publication Critical patent/EP0641264B1/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

Definitions

  • the invention relates to a control screen, in particular with a pneumatic material feed, a screen housing, a cylindrical screen jacket with a centrifugal rotor rotating therein, an outlet for the screen rejection and an outlet for the screen diarrhea.
  • the control sieve can be installed within a pneumatic transport, for example, which is already present, but it is required that a corresponding sieving device does not result in great resistance, which would increase the force required for the pneumatic transport.
  • a separate genre of the so-called "screening machines in compressed air delivery” developed.
  • This old publication proposed to arrange a beater mechanism with a high rotational speed within a cylindrical sieve jacket and to further convey the flour freed from the shells via an annular cylindrical channel with the air flow.
  • the accent of this facility lies in its function as a bran spinner, which is a typical aggregate in mill processing technology.
  • the device mentioned was further developed with a view to the actual function of the control screening of large quantities of flour, which for example have to be reloaded into silos by a transport vehicle. It is proposed to arrange the screening device at the end of a pneumatic delivery line. Instead of the traditional beater mechanism for bran centrifuges, a rotor with longitudinal blades is selected and the material to be screened is guided against the screen jacket by a disc.
  • DE-AS 1 255 461 further describes a sieve drum which can have a cutting disc in the form of a worm thread on the rotor.
  • GB-A 18054 in turn describes a device for sorting, cleaning and polishing peas, beans, corn, seeds and the like. Like., Which has a sieve housing with a sieve jacket with a centrifugal rotor rotating therein, the centrifugal rotor having centrifugal strips which extend essentially over the length of the sieve jacket. The centrifugal strips have radially projecting tabs made of elastic material.
  • a device is unsuitable for the control screening of flour or a pneumatic material feed.
  • the object of the invention was now to avoid the disadvantages of the known solutions, in particular to achieve a high throughput with the greatest possible security for the control screening.
  • pneumatic transport there should only be a slight loss of pressure.
  • the solution according to the invention is characterized in that the centrifugal rotor has a plurality of centrifugal strips, which extend essentially over the entire length of the screen jacket, with radially projecting conveying or cleaning tabs, which are preferably made of rubber-elastic material, and work in the vicinity of the screen jacket or the Lightly touch the inner surface of the sieve jacket, the conveyor or cleaning tabs being arranged on the same centrifugal bar with a longitudinal spacing and a staggered arrangement to the following centrifugal bar.
  • the invention allows a number of particularly advantageous configurations.
  • a sieve opening is deliberately chosen through which all flour can pass. Exactly through the relatively large sieve openings, however, tired bristles (D ⁇ 0.3 mm) can penetrate the brush cleaning element and undesirably reach e.g. in the food.
  • An optimal sieving effect was achieved when the centrifugal strips have several, radially protruding, rubber-elastic conveying or cleaning tabs. Corresponding bristle parts no longer occur with the elastic conveyor or cleaning rags.
  • the tests have shown that those that were already in the estate are even read out. It is also proposed that the cleaning cloth on the same fling bar are arranged at a longitudinal distance from one another, preferably with a staggered arrangement to the next following flap bar to form a helical conveying component over the length of the screen jacket.
  • the resulting swirl-like movement of the material supports the sieving, and at the same time ensures that the coarse material is conveyed quickly and foreign bodies are discharged to the outlet.
  • the elastic cleaning rags touch the inner surface of the sieve (work surface) for flour or semolina-like products, for example, and keep it clean.
  • the expected performance could also be achieved with pneumatic material feed, and a low pressure loss in the order of 30 to 50 mm ws (water column) was found.
  • Tests have confirmed that the material to be screened is not simply guided into the space of the screen cylinder, but can at the same time be optimally distributed within a first section of the screen jacket by an entry distributor. The majority of the flour passes through the screen jacket in the first third, provided that the centrifugal bars are already fully effective in this section.
  • the feed distributor is designed as a driven feed slug and can be a feed screw, preferably one or two or more threads.
  • the worm housing can be designed to be rotatable, with inlet connections for the pneumatic material feed opening radially or tangentially to the axis of rotation of the centrifugal rotor.
  • inlet connections for the pneumatic material feed opening radially or tangentially to the axis of rotation of the centrifugal rotor.
  • the rotor can be driven at low speed, preferably at less than 500 rpm.
  • the service life of the control screen device in particular the service life of the screen jacket and the cleaning cloth, can be increased.
  • a further displacement body can be arranged between the distribution section and the outlet for the screen repulsion, the outlet in the form of an annular gap for the screen repulsion preferably being formed by a rubber-elastic disk.
  • the centrifugal rotor it is also possible for the centrifugal rotor to have a stepped or conically widening displacement body or at least 2 corresponding baffle plates between the distribution section and the outlet.
  • the invention further relates to the use of the control sieve device for the control sieving of flour-like goods.
  • a pneumatic material feed 1 is connected via an elbow piece 2 to a connection piece 3 of a rotatable screw housing 4 of an entry screw 5.
  • the feed screw 5 is fixedly connected to a shaft 6 of a centrifugal rotor 7 which can be driven via a pulley 8.
  • the housing 4 can be rotated about the axis 9 of the centrifugal rotor 7 and arranged in any rotational position, for example screwed onto a sieve housing 16 via clamping rings 10.
  • the scrubbing rotor 7 is surrounded over the entire length by a screen jacket 11, so that the cleaned material can only pass through the meshes of the screen jacket 11.
  • Coarser parts that have to be screened are removed at the opposite end through an outlet 12.
  • the outlet 12 is delimited by the screen jacket 11 and by a rubber-elastic plate 13, which has a slightly smaller diameter than the screen jacket 11 and forms a gap 14.
  • a coarse material box 15 can preferably be pivoted away about a vertical axis, for checking the screen jacket or for service work.
  • the screen housing 16 and a collecting container 17 and feed 18 and end flap 19 are pressure-resistant as required educated.
  • the lower part of the machine housing is equipped as a collecting funnel 20, on which a delivery pipe 21 (outlet) is arranged for the pneumatic further transport of the sieved material.
  • the centrifugal rotor 7 has four centrifugal strips 22 which extend essentially over the entire length L of the screen jacket 11, these being arranged offset by 90 ° each.
  • the centrifugal strips have the primary function of keeping the material in a strong circular motion so that the material is always driven to the screen jacket 11 by the corresponding centrifugal force.
  • two baffle plates 24 and 25 are also arranged, which are intended to prevent the material from being moved too directly.
  • the two baffle plates 24 and 25 simultaneously divide the inner screen space into three parts, a first section A preferably being less than 1/3 of the length and the remaining section B correspondingly being more than 2/3 of the length.
  • Section A simultaneously forms the distribution table section in which the material is distributed uniformly over the entire circumference of the screen jacket 11 by the rotary movement of the feed screw 5.
  • An additional distribution effect is achieved in that the centrifugal strips 22 also extend over this section by a dimension As ''.
  • the stringer bars 22 are rigidly connected to the shaft 6 by an arm cross 26.
  • a large number of conveyor or cleaning tabs 23 are fixedly attached to the centrifugal strips 22, which protrude radially, are more or less rubber-elastic and lightly touch the screen jacket 11 for all non-abrasive goods.
  • the cleaning rags 23 are shown on a larger scale in FIGS. 2, 3 and 4.
  • the conveyor or wiping cleaning tabs 23 are, as can be seen from FIG. 4, attached to the centrifugal bars 22 by a clamping bar 27 and can bend backwards when a large foreign body enters (23 '), so that the latter is not jammed, such as this can happen with rigid strips.
  • the four flinger 22 are shown schematically lined up.
  • the conveying or cleaning tabs are offset by a dimension X, the dimension X also corresponding approximately to the length of an individual cleaning tab 23 in the example.
  • the individual cleaning rag is preferably given a trapezoidal shape, so that over the entire length of an individual fling bar 22 a sawtooth shape is formed ( Figure 2).
  • the offset arrangement produces a conveying effect as indicated by the arrows 28 (FIG. 3). This creates a swirl effect in the interior of the screen jacket especially for the coarse material, towards the outlet, at the end of the screen jacket. It is particularly important that the centrifugal strips 22 and the cleaning tabs 23 are also fully effective in the distribution section A. In this area, therefore, due to the unequal length of the cleaning tabs 23a, 23b, 23c and 23d, without displacement, only a minimal conveying effect, but intensive distribution and sieve support is desired.
  • FIG. 5 shows an example of a pneumatic pressure delivery system with a built-in control screen 30.
  • a blower 31 supplies the required compressed air, which can be adjusted in pressure via a pressure control valve 37.
  • the material is fed into the pressure delivery line 1 via a rotary lock 32. Dash-dotted lines indicate that the delivery line can also be laid according to line 1 ', which is feasible by turning the screw housing 4 according to arrow 33.
  • the pneumatic tube 21 for the screened material is conveyed with the same conveying air into a trimelle 34 or, for example, into a container from which the air is discharged via a filter 35 and a fan 36 and the material can be fed for further processing.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Centrifugal Separators (AREA)
  • Threshing Machine Elements (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Vehicle Body Suspensions (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (6)

  1. Tamiseur de sécurité, comprenant notamment des moyens d'alimentation pneumatique en matière (1), un carter de tamisage (16), une enveloppe de tamisage (11) cylindrique, dans laquelle un rotor centrifuge (7) tourne, une sortie (12) pour le refus de tamisage et une sortie (21) pour l'extraction de tamisage, le rotor centrifuge (7) comportant plusieurs barres de centrifugation (22) s'étendant essentiellement sur toute la longueur de l'enveloppe de tamisage (11) et comportant des jupes d'avancement ou de nettoyage (23), en saillie radiale, qui sont de préférence formées d'une matière élastique et qui travaillent dans la zone voisine de l'enveloppe de tamisage,
       caractérisé en ce que les jupes d'avancement ou de nettoyage (23) situées sur la même barre de centrifugation (22) sont disposées avec un espacement longitudinal entre elles, avec un agencement décalé par rapport à la barre de centrifugation (22) directement suivante, afin de créer une composante d'avancement en hélice, de l'entrée dans l'enveloppe de tamisage (11) jusqu'à la sortie (12) prévue pour le refus de tamisage.
  2. Tamiseur de sécurité suivant la revendication 1, caractérisé en ce que les jupes d'avancement ou de nettoyage (23) sont en une matière à élasticité du type caoutchouc et viennent légèrement au contact de la surface intérieure de l'enveloppe de tamisage (11).
  3. Tamiseur de sécurité suivant la revendication 1, caractérisé en ce que les moyens d'alimentation en matière (1) sont réalisés sous forme d'un carter (4) pouvant être déplacé angulairement et comportant un manchon d'entrée (3) qui débouche radialement ou tangentiellement par rapport à l'axe de rotation du rotor centrifuge (7).
  4. Tamiseur de sécurité suivant l'une des revendications 1 à 3, caractérisé en ce qu'une section de distribution (A) est réalisée à l'intérieur de l'enveloppe de tamisage (11) à peu près dans le premier tiers, cette section de distribution servant à répartir mécaniquement et uniformément la matière à l'entrée dans l'enveloppe de tamisage (11) directement sur toute la périphérie du tamiseur.
  5. Tamiseur de sécurité suivant la revendication 4, caractérisé en ce que la section de distribution (A) est délimitée au moyen d'un disque de retenue (24) entraîné en même temps en rotation et la sortie (12) prévue pour le refus de tamisage est formée au moyen d'un disque élastique (13).
  6. Utilisation du tamiseur de sécurité suivant les revendications 1 - 5 pour le tamisage de sécurité de matières du type farine.
EP94908243A 1993-03-12 1994-03-11 Crible de controle et procede de criblage de controle Expired - Lifetime EP0641264B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4307789 1993-03-12
DE4307789A DE4307789C3 (de) 1993-03-12 1993-03-12 Kontroll-Siebvorrichtung sowie Verwendung der Vorrichtung
PCT/CH1994/000053 WO1994020228A1 (fr) 1993-03-12 1994-03-11 Crible de controle et procede de criblage de controle

Publications (2)

Publication Number Publication Date
EP0641264A1 EP0641264A1 (fr) 1995-03-08
EP0641264B1 true EP0641264B1 (fr) 1997-11-19

Family

ID=6482564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94908243A Expired - Lifetime EP0641264B1 (fr) 1993-03-12 1994-03-11 Crible de controle et procede de criblage de controle

Country Status (8)

Country Link
US (1) US5593042A (fr)
EP (1) EP0641264B1 (fr)
CN (1) CN1053847C (fr)
AT (1) ATE160301T1 (fr)
DE (2) DE4307789C3 (fr)
ES (1) ES2109679T3 (fr)
GB (1) GB2276339B (fr)
WO (1) WO1994020228A1 (fr)

Families Citing this family (19)

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DE19628437C2 (de) * 1996-07-15 1999-05-12 Wiegand Thomas Einrichtung und Verfahren zur Klassierung und knautschenden Verringerung von Partikelgrößen eines Granulatgemisches
DE19634291C2 (de) * 1996-08-24 2002-03-14 Azo Gmbh & Co Vorrichtung zum Sieben
JP3492676B2 (ja) * 2000-11-08 2004-02-03 ツカサ工業株式会社 インラインシフタ
DE10135398A1 (de) * 2001-07-25 2003-02-20 Recover System Recycling Gmbh Verfahren und Vorrichtung zum Klassieren von Wertstoff mit mindestens einer Faserfraktion
WO2007061447A2 (fr) * 2005-11-15 2007-05-31 Sefar Filtration Inc. Cadre de tamis jetable prealablement tendu et procede de fabrication correspondant
US8240481B2 (en) * 2006-05-10 2012-08-14 Tsukasa Co., Ltd. Sifter
CN101378847B (zh) * 2006-05-10 2012-06-27 株式会社知嘎萨 筛粉机
US8118173B2 (en) * 2008-12-03 2012-02-21 Westlake Longview Corp. Streamer trap assembly
JP5895713B2 (ja) * 2012-06-01 2016-03-30 株式会社サタケ 異物選別機
US11180391B2 (en) 2013-10-02 2021-11-23 Anaergia B.V. Method and device for processing solid waste
NL1040425C2 (nl) * 2013-10-02 2015-04-07 Technologies Holding B V D Werkwijze en inrichting voor het scheiden van lichtere deeltjes en zwaardere deeltjes.
US9440262B2 (en) * 2014-11-07 2016-09-13 Rec Silicon Inc Apparatus and method for silicon powder management
MX2017010765A (es) * 2015-02-23 2018-05-11 Fluid Quip Inc Aparato de tamiz con paletas multizona.
US11033940B2 (en) 2015-11-02 2021-06-15 Anaergia B.V. Method and device for processing solid waste
US10287171B2 (en) 2016-05-05 2019-05-14 Rec Silicon Inc Tumbling device for the separation of granular polysilicon and polysilicon powder
US9682404B1 (en) * 2016-05-05 2017-06-20 Rec Silicon Inc Method and apparatus for separating fine particulate material from a mixture of coarse particulate material and fine particulate material
US10639645B2 (en) * 2018-06-19 2020-05-05 Ecomill, Llc Method for separating fine fractures and coarse fractures using a vacuum
US10993375B2 (en) * 2018-06-19 2021-05-04 Ecomill, Llc Centrifugal scattering device
CN111589707A (zh) * 2020-05-18 2020-08-28 赖新亮 一种豆类加工滚筒式无尘除石的方法

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GB190918054A (en) * 1909-08-05 1910-07-07 Ebenezer Hill Improved Means or Apparatus for Grading, Cleaning and Polishing Peas, Beans, Maize, Seeds and the like.
US1443773A (en) * 1919-11-12 1923-01-30 Howard L Wadsworth Sand-cutting machine
FR658529A (fr) * 1928-08-03 1929-06-05 Perfectionnements aux tamis
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Also Published As

Publication number Publication date
DE4307789C3 (de) 2000-02-24
CN1053847C (zh) 2000-06-28
DE4307789C2 (de) 1996-04-04
WO1994020228A1 (fr) 1994-09-15
ATE160301T1 (de) 1997-12-15
GB9404781D0 (en) 1994-04-27
GB2276339A (en) 1994-09-28
DE4307789A1 (de) 1994-10-27
ES2109679T3 (es) 1998-01-16
GB2276339B (en) 1997-05-21
US5593042A (en) 1997-01-14
CN1105502A (zh) 1995-07-19
DE59404615D1 (de) 1998-01-02
EP0641264A1 (fr) 1995-03-08

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