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WO1991005616A1 - Tamis rotatif servant a separer les fines contenues dans des matieres particulaires de faible densite - Google Patents

Tamis rotatif servant a separer les fines contenues dans des matieres particulaires de faible densite Download PDF

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Publication number
WO1991005616A1
WO1991005616A1 PCT/AU1990/000486 AU9000486W WO9105616A1 WO 1991005616 A1 WO1991005616 A1 WO 1991005616A1 AU 9000486 W AU9000486 W AU 9000486W WO 9105616 A1 WO9105616 A1 WO 9105616A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
zone
fines
mixing chamber
screening apparatus
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.)
Ceased
Application number
PCT/AU1990/000486
Other languages
English (en)
Inventor
Charles Treffner
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1991005616A1 publication Critical patent/WO1991005616A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • 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
    • B07B1/22—Revolving drums
    • B07B1/24—Revolving drums with fixed or moving interior agitators
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/06—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall using revolving drums
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • 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
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • This invention relates to rotary screens or sieves for separating fines, that is to say dust and other small particles, from mixtures of fines and particulate material of a larger particle size.
  • the invention is particularly directed to the separation of fines from low density particulates, such as fragmented expanded polystyrene (EPS) foam.
  • EPS fragmented expanded polystyrene
  • EPS articles are moulded by partially filling a mould cavity with expandable polystyrene beads and heating the beads to cause them to expand to fill the cavity and adhere together to form a rigid foam body.
  • the regranulate consists of clean, separated, prior expanded beads, but that ideal has not hitherto been realised in practice when utilising known machinery for breaking down the scrap.
  • regranulate is used straight from the breaking down machinery and comprises a mixture of beads, other more or less bead-sized fragments and fines or dust.
  • an object of the present invention is to provide granulate screening apparatus which efficiently removes fines from EPS regranulate stock. It will be appreciated however that the invention is applicable to the separation of fines from any low density particulate material.
  • the invention achieves that object by providing a rotary screen wherein an air stream blows the granulate or the like against the surface of a zone or portion of the screen, against which the particle component is trapped and through which the fines escape with the air stream.
  • the invention consists in rotary screening apparatus of the kind comprising a rotary, open-ended, cylindrical, perforate screen and means to feed particulate material and fines to be separated . into one end of the screen, for the discharge of fines through the screen perforations and of particulates through the other end of the screen, characterised by sealing means defining two longitudinally extending opposed zones of the curved wall of said screen and fan means causing air to flow into said screen through one said zone and, with entrained fines, from said screen through the other said zone.
  • said one zone is an under zone and said other zone is an upper zone of the screen surface, so that the air stream lifts the material to be screened against the active or screening zone.
  • transporting means are provided to assist or effect the movement of the particulates from end to end of the screen comprising at least one stationary deflecting element within the screen.
  • That deflecting element is adapted not only to deflect material impinging on the element while moving with the screen in the longitudinal direction of the screen, but also to stir and turn over the material as it flows against the element.
  • the deflector element is an Archimedes screw blade, of somewhat lesser outer diameter than the inner diameter of the screen, extending longitudinally of the screen and being substantially co-axial therewith. That screw blade acts as an auger urging the material along the screen as the screen rotates.
  • Figure 1 is a side elevation of an embodiment of a screening apparatus according to the invention with some side panels removed to show interior components.
  • Figure 2 is an sectional view taken on line 2-2 of figure 1.
  • Figure 3 is a plan view of the apparatus of figure 1.
  • Figure 4 is sectional detail of the mounting arrangements for the screen and deflector element of the apparatus of figure 1 drawn to a larger scale.
  • the screening apparatus is an integral part of mixing and feeding means for the supply of a mixture of winnowed granulate and fresh expandable polystyrene beads directly to the input hopper of a continuous, EPS foam, block moulding machine.
  • the apparatus as a whole comprises a supporting frame fabricated from steel structural members 10 which, together with sheet metal side and roof panels 11, define three chambers, namely a dust extraction chamber 12, an inlet chamber 13 at one end of the extraction chamber 12 and a mixing chamber 14 at the other end of the extraction chamber 12.
  • a rotary cylindrical screen 15 having mesh walls of sufficient fineness to retain useful regranulate but permit the throughflow of fines, extends effectively from the inlet chamber 13 to the mixing chamber 14 «
  • the cylindrical screen 15 is supported at each end by cylindrical, open ended drums 16 integral with three- legged spiders 17.
  • the spiders 17 and the drums 16 are rotatably mounted upon a fixed shaft 18 co-axial with the screen 15 and extending from a supporting bracket and clamp 19 within the mixing chamber 14 through the extraction chamber 12.
  • That fixed shaft 18 which may be tubular or, as illustrated, have a tubular central portion, has a deflector element comprising a helical fin 20 wrapped around it which extends as an Archimedean screw, albeit a stationary one, from one end of the screen 15 to the other.
  • the screw has a somewhat lesser diameter than the screen so as not to impede the free rotation of the screen.
  • the screen spider 17, at the input chamber end, is fixed upon a driven shaft 21 extending through the input chamber 13 from an external belt drive transmission 22 from a motor 31 providing infinitely variable control, within limits, of the speed of rotation of the screen 15.
  • the driven shaft 21, spiders 17 and screen 15 rotate as one, being supported by bearings 32 in a housing 33 on an end wall of the input chamber 13, bearing 34 on one end of the fixed shaft 18 and bearings 35 on the fixed shaft 18 near its other end.
  • the input chamber 13 is essentially a simple hopper adapted to receive raw regranulate from an elevated storage silo or the like through an inlet chute or duct 23.
  • the driven shaft 21 within it may be provided with radially extending scoops adapted to shovel the raw material between the legs of the associated spider 17 into the drum 16 and thus into the adjacent open end of the cylindrical screen 15 as those parts and the shaft 21 rotate.
  • Felt sealing strips 41 are wrapped upon the drums 16 to prevent leakage where the drums extend through cavity septum walls between the input chamber 13 and the extraction chamber 12 and between the latter and the mixing chamber 14-
  • the extraction chamber 12 is essentially a shroud covering, say, the upper three quarters of the cylindrical surface of the screen 15.
  • the lower longitudinal edges of the extraction chamber walls are substantially" sealed to the screen surface by sealing means in the form of longitudinal wipers, for example, wipers in the form of bristled brushes 24- Those sealing means remain stationary as the screen rotates and at all times define an under zone 25 of the screen surface and an opposed, somewhat larger upper zone 26 of that surface.
  • the extraction chamber walls are spaced from the cylindrical surface of the screen to provide an air space therebetween.
  • a centrifugal fan 27 is mounted on or adjacent the extraction chamber 12 with its inlet port 3 communicating with that air space and its outlet 37 ducted to a dust filter bag (not shown).
  • a dust filter bag (not shown).
  • the regranulate is sucked against the upper zone 26 and taken along by its rotation relative to the screw. At the same time it is turned over and tumbled to be thoroughly exposed to the air stream for the efficient entrainment of the dust and fines.
  • Some particles held clear of the screw blade 20 against an upper part of the screen by the air flow get blown off as the part of the screen in question moves past a brush 24 clear of the extraction chamber and is exposed to inflowing air. This also contributes to the general churning and mixing of the material within the screen.
  • the cleaned or treated regranulate discharges from the screen 15 into the mixing chamber 14 « Fresh beads from a bead silo or the like are also discharged into the mixing chamber 14 at a predetermined rate by a screw conveyor 28 or other conventional means. The regranulate and the beads are mixed together by swirling air currents in the mixing chamber 14 « To that end a second centrifugal fan 29 may be provided with its inlet port 39 opening into the interior of the mixing chamber and its outlet 38 ducted to the input hopper (not shown) of a block moulding machine.
  • An adjustable vent opening 30 is provided in the roof or a wall of the mixing chamber 14- That opening 30 admits an air stream which both mixes the chamber contents and provides an entraining stream for the discharge of the mixed contents through the fan 29.
  • the size of the vent opening is adjustable by means of a sliding damper 40.
  • the size of the vent opening 30 is selected to ensure that the air pressure differential between the pressure in the mixing chamber 14 and in the outlet end of the screen 15 is suited to the prevailing conditions.
  • the differential has to be such that, on one hand, the mixing chamber fan 29 does not suck material from the screen before it has been adequately cleaned and, on the other hand, such that the screen is not clogged by the extraction chamber fan 27 sucking material back from the mixing chamber 14 against the flow of material in the screen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

Le tamis rotatif décrit, qui sert à séparer les fines mélangées à des particules de mousse de polystyrène expansée, comprend un tamis cylindrique rotatif (15) dont l'axe est sensiblement horizontal et par l'une des extrémités duquel le matériau à tamiser est acheminé, une membrane qui recouvre une partie supérieure du tamis et dont les parois sont scellées au tamis par des balais-brosses à poils (24), un ventilateur (27) qui aspire l'air à partir de la membrane de façon à faire pénétrer le courant d'air dans le tamis à travers sa partie inférieure non recouverte par la membrane et qui fait sortir cet air dans lequel les fines sont entraînées pour les faire pénétrer dans un sac de filtrage. Les particules résiduelles sont amenées à s'écouler le long du tamis pour être déchargées à l'autre extrémité par contact avec une vis d'Archimède fixe (20) placée coaxialement dans le tamis. Le matériau déchargé est reçu dans une chambre de mélange dégazée, où il est mélangé à de nouvelles particules expansibles et acheminé directement dans une machine de moulage de la mousse par un second ventilateur qui aspire l'air à travers la chambre de mélange.
PCT/AU1990/000486 1989-10-13 1990-10-10 Tamis rotatif servant a separer les fines contenues dans des matieres particulaires de faible densite Ceased WO1991005616A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ6854 1989-10-13
AUPJ685489 1989-10-13

Publications (1)

Publication Number Publication Date
WO1991005616A1 true WO1991005616A1 (fr) 1991-05-02

Family

ID=3774276

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000486 Ceased WO1991005616A1 (fr) 1989-10-13 1990-10-10 Tamis rotatif servant a separer les fines contenues dans des matieres particulaires de faible densite

Country Status (1)

Country Link
WO (1) WO1991005616A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001046304A3 (fr) * 1999-12-23 2002-03-07 Mobius Technologies Inc Techniques de traitement de poudre de mousse polymerique, produits de poudre de mousse, et mousses contenant ces poudres de mousse
WO2004048006A1 (fr) * 2002-11-28 2004-06-10 Mbengineering Gmbh & Co. Kg Procede et dispositif pour separer des particules de poussiere d'un granulat
CN101947516A (zh) * 2010-09-26 2011-01-19 桂林宝利新技术开发有限公司 水泥磨钢锻分级机
WO2015150484A1 (fr) 2014-04-01 2015-10-08 Bühler AG Dispositif de tamisage pour le déchargement de véhicules-silo
CN107855275A (zh) * 2017-12-10 2018-03-30 天长市天鑫粮油贸易有限责任公司 一种大米风选机
CN108789996A (zh) * 2018-05-16 2018-11-13 甘春勇 一种eps泡沫包装箱的制备方法
CN112122126A (zh) * 2020-09-15 2020-12-25 泰州明锋资源再生科技有限公司 一种矿渣辊压机的多级选粉处理装置
CN113245180A (zh) * 2021-04-15 2021-08-13 河南工业大学 一种粉体分级系统
CN116967115A (zh) * 2023-08-08 2023-10-31 中国长江三峡集团有限公司 一种室内细粒土料离心筛分处理装置及方法
CN119140436A (zh) * 2024-11-14 2024-12-17 安徽旭晶媒美新材料科技有限公司 一种氯化铜干法制备用过滤装置及其过滤方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB233597A (en) * 1924-10-10 1925-05-14 Otto Lichtenberg Improvements in devices for dressing corn and the like
GB248541A (en) * 1925-02-12 1926-03-11 Robert Watson Improvements in sifting or separating machines suitable for seeds, grains and other materials
US2525734A (en) * 1945-11-17 1950-10-10 Webster C Sweet Flour sifter
FR2421685A1 (fr) * 1978-04-07 1979-11-02 Bounet Raymond Separateur de feuilles et impuretes legeres
US4229286A (en) * 1978-08-16 1980-10-21 Bridges Charles R Apparatus and method for removing dust from tufts of opened cotton fiber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB233597A (en) * 1924-10-10 1925-05-14 Otto Lichtenberg Improvements in devices for dressing corn and the like
GB248541A (en) * 1925-02-12 1926-03-11 Robert Watson Improvements in sifting or separating machines suitable for seeds, grains and other materials
US2525734A (en) * 1945-11-17 1950-10-10 Webster C Sweet Flour sifter
FR2421685A1 (fr) * 1978-04-07 1979-11-02 Bounet Raymond Separateur de feuilles et impuretes legeres
US4229286A (en) * 1978-08-16 1980-10-21 Bridges Charles R Apparatus and method for removing dust from tufts of opened cotton fiber

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001046304A3 (fr) * 1999-12-23 2002-03-07 Mobius Technologies Inc Techniques de traitement de poudre de mousse polymerique, produits de poudre de mousse, et mousses contenant ces poudres de mousse
US6670404B2 (en) 1999-12-23 2003-12-30 Mobius Technologies, Inc. Polymeric foam powder processing techniques, foam powders products, and foams produced containing those foam powders
WO2004048006A1 (fr) * 2002-11-28 2004-06-10 Mbengineering Gmbh & Co. Kg Procede et dispositif pour separer des particules de poussiere d'un granulat
CN101947516A (zh) * 2010-09-26 2011-01-19 桂林宝利新技术开发有限公司 水泥磨钢锻分级机
US10926296B2 (en) 2014-04-01 2021-02-23 Bühler AG Screen device for unloading silo vehicles
WO2015150484A1 (fr) 2014-04-01 2015-10-08 Bühler AG Dispositif de tamisage pour le déchargement de véhicules-silo
CN107855275A (zh) * 2017-12-10 2018-03-30 天长市天鑫粮油贸易有限责任公司 一种大米风选机
CN108789996A (zh) * 2018-05-16 2018-11-13 甘春勇 一种eps泡沫包装箱的制备方法
CN108789996B (zh) * 2018-05-16 2020-06-09 合肥壹物新材料科技股份有限公司 一种eps泡沫包装箱的制备方法
CN112122126A (zh) * 2020-09-15 2020-12-25 泰州明锋资源再生科技有限公司 一种矿渣辊压机的多级选粉处理装置
CN113245180A (zh) * 2021-04-15 2021-08-13 河南工业大学 一种粉体分级系统
CN116967115A (zh) * 2023-08-08 2023-10-31 中国长江三峡集团有限公司 一种室内细粒土料离心筛分处理装置及方法
CN119140436A (zh) * 2024-11-14 2024-12-17 安徽旭晶媒美新材料科技有限公司 一种氯化铜干法制备用过滤装置及其过滤方法

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