WO2000056472A1 - Dispositif de separation aerodynamique de particules - Google Patents

Dispositif de separation aerodynamique de particules Download PDF

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Publication number
WO2000056472A1
WO2000056472A1 PCT/NL2000/000185 NL0000185W WO0056472A1 WO 2000056472 A1 WO2000056472 A1 WO 2000056472A1 NL 0000185 W NL0000185 W NL 0000185W WO 0056472 A1 WO0056472 A1 WO 0056472A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
conveyor belt
flights
condition
hoppers
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/NL2000/000185
Other languages
English (en)
Inventor
Cornelis Verschut
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to AU34654/00A priority Critical patent/AU3465400A/en
Publication of WO2000056472A1 publication Critical patent/WO2000056472A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/10—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements

Definitions

  • the present invention relates to a device for aerodynamically separating particles according to their physical properties, such as size, shape, density, drag, etc., in particular for separating particles of the order of 0.5 to 20 mm, a density of about 800 to 8000 kg/m 3 , and a drag coefficient of about 0.5 to 1.25.
  • a purification and/or grading must often take place first, in which small stones, hulls, membranes, and other contaminating particles are removed or a grading according to particle size is carried out.
  • Such a device may also be used for, e.g., purifying and selecting cereal grains and seeds, separating hulls from broken cocoa and soya beans.
  • such a device may also be used for separating waste fractions and mixtures of metals and plastics, grading compost components, gravel, minerals, and the like.
  • the invention actually relates to a device for aerodynamically separating particles according to their physical properties, such as size, shape, density, drag, etc., which comprises a conveyor belt on which the particles to be separated are placed to drop them from the conveyor belt at the end thereof at substantially the same speed of at least 3.5 to 4 m/s, which particles, depending on their physical properties, describe specific flights, and which comprises collecting means arranged behind each other in the plane of the flights to enable collection of the particles separated into categories .
  • the conveyor belt may be arranged horizontally as well as at a specific angle.
  • the above minimum speed relates to the speed in the conveying direction of the conveyor belt .
  • Such a device for aerodynamically separating particles is known from, e.g., EP-A-0 329 865.
  • the containers are arranged behind each other at equal height, which results in a relatively rough grading according to size and density of the particles. Because the particles are supposed here to leave the conveyor belt at the same speed, in particular of the order of 10 m/s, the flights traveled by the particles are, to be sure, determined by their size, density, and drag, but these flights are prematurely broken off by the arrangement and the shape of the containers.
  • the device as actually described in the preamble is characterized in that the conveyor belt comprises means for bringing the particles falling thereon substantially into the condition of rest and maintaining them in this condition, and that the movement of the particles from the conveyor belt takes place in a closed space, the minimum drop height of the particles moving through the greatest distance in the horizontal direction being about 4 m, in particular about 5 m, and preferably about 6 m .
  • EP-A-0 427 305 discloses a device for aerodynamically separating particles in which a chute is provided to place the particles at a specific speed on the conveyor belt where they are subjected to such a friction that the particles subjected to the least friction leave the belt at a relatively high speed and the particles subjected to a greater friction leave the belt at a lower speed.
  • the particles are therefore separated on the basis of their surface structure. Consequently, a separation according to, e.g., size is not possible very well.
  • a further device for aerodynamically separating particles is known from US-A-3 , 014 , 584.
  • the particles are passed angularly upwardly between two co-moving conveyor belts and projected and thereby describe flights in which, in spite of the fact that the containers are all located at practically the same height as the point where the particles are projected from the relevant conveyor belt, the particles are nonetheless more distinguishable from each other. But here, too, the separation of the particles remains insufficiently accurate, which further appears from the fact that in this device two conveyor belts are placed above each other, with the point where the particles leave the relevant conveyor belts being different. Here, too, the containers are completely open, and the particles can be exposed to undesired air currents.
  • a closed space, of which the separate containers arranged behind each other form the bottom side, is known per se from the aerodynamic separating device as described in French patent 944,137.
  • the particles are supposed to have the same speed, namely such that they can be brought from the conveyor belt through an opening into this space in which they describe their specific flights and are collected in the relevant containers.
  • the flights because of the small height at which the containers are located, are too short to effect a separation of particles with the desired accuracy.
  • a screen is arranged above the conveyor belt.
  • the conveyor belt is provided according to the invention with a chute and with unevennesses in which the particles placed via the chute on the conveyor belt come into the condition of rest .
  • the unevennesses specifically comprise depressions the size of which is adjusted to that of the largest particles.
  • the conveyor belt is provided at the top side with a screen. The particles projected by the conveyor belt are brought via a slot of preferably not more than 5 cm into the closed space. This slot is kept as narrow as possible to stop the air current drawn along with the conveyor belt and the particles located thereon; the air current sucked along into the closed space causes air turbulences in the closed space, which particularly affects the flights of lighter particles.
  • the collecting means are formed by hoppers with containers placed below them.
  • the hoppers and the containers can be arranged side by side at a sufficient distance below the conveyor belt, so that the closed space can obtain a rectangular shape
  • the drop height of the particles down to the hoppers is preferably reduced according as the hoppers are situated closer to the point where the particles are projected the conveyor belt. In fact, for the first hoppers behind this point of projection it holds that the horizontal speed component of the particles falling into the hoppers has very rapidly assumed the value of zero.
  • FIG. 1 schematically shows a practical example of the device according to the invention
  • Fig. 2 shows a fragment of the conveyor belt of the device shown in Fig. 1;
  • Figs. 3-6 show some diagrams on the basis of which the operation of the device will be further explained.
  • the device according to the invention schematically shown in Fig. 1, comprises a closed space 1 with a slit 2, in which a horizontally arranged, driven, endless conveyor belt 3 ends.
  • the conveyor belt is provided with a chute 4 and a screen 5.
  • the bottom side of the closed space is provided with a plurality of hoppers 6-9 with, if desired, a screw conveyor, which hoppers, according as they are situated farther from the conveyor belt 3 in the horizontal direction, are arranged increasingly lower.
  • Fig. 1 shows only four hoppers. However, it will be clear that, in principle, this number may be selected arbitrarily. Placed below the hopper openings are containers 10-13.
  • Fig. 2 shows a fragment of the conveyor belt 3.
  • the conveyor belt 3 has an uneven surface which has depressions 14 the size of which is adjusted to that of the largest particles.
  • the conveyor belt can be adapted to the size of the particles processed in
  • the particles placed via the chute 4 on the conveyor belt 3 will come thereon relatively rapidly into a condition of rest, because of the uneven surface of the conveyor belt 3 and the screen 5, so that these particles will all leave the conveyor belt at practically the same speed.
  • the projection speed which is the speed in the horizontal direction at which the particles leave the conveyor belt, and which speed is therefore almost equal to the conveying speed of the conveyor belt, is adjustable and is at least 3.5-4 m/s.
  • the particles leaving the conveyor belt describe flights which are defined by the horizontal projection speed, the size, density, and drag coefficient of the particles. These flights are shown in the diagrams of Figs. 3-6. In these diagrams, the displacement of the particles in the horizontal direction is shown against the displacement in the vertical direction, that is to say in meters.
  • Fig. 3 shows the flights of particles of which the projection speed is 6 m/s, the size 4 mm, and the drag coefficient 1.00.
  • the curves 15-18 show the flights at densities of respectively 1000, 2000, 4000, and 8000 kg/m 3 .
  • Fig. 4 shows the flights of particles of which the projection speed is 6 m/s, the drag coefficient 1.00, and the density 2000 kg/m 3 .
  • the curves 19-23 show the flights at a particle size of respectively 1, 2, 4, 8, and 16 mm.
  • Fig. 5 shows the flights of particles of which the projection speed is 6 m/s, the size 4 mm, and the density 2000 kg/m 3 .
  • the curves 24-27 show the flights at drag coefficients of respectively 0.5, 0.75, 1.00, and 1.25.
  • Fig. 6 shows the flights of particles of which the drag coefficient is 1.00, the size 4 mm, and the density
  • the curves 28-32 show the flights at a projection speed of respectively 2, 4, 6, 8, and 10 m/s. From these curves it appears, as could be expected, that the projection speed affects the horizontal displacement most, while the drag coefficient only plays a minor role. To obtain an efficient separation of particles, the differences in horizontal displacement at a specific drop height will have to be relatively great. Hence the minimum projection speed is adjusted to 3.5-4 m/s and the minimum drop height to about 6 m. Preferably, a drop height of the order of about 10 m is selected. However, because for the smallest particles and/or those having the lowest density it holds that the horizontal speed component has relatively rapidly decreased to practically zero, a smaller drop height can be used for these particles.
  • the drop height of the heaviest particles and/or those having the highest density is about 10 m, and in the embodiment shown, this drop height decreases for lighter particles and/or particles having a lower density to respectively about 8, 6, and 4 mm.
  • a further reason therefor is that, when for the above light particles and/or particles having a low density, the horizontal speed component has become practically zero, a further distinction between these particles is no longer possible after all, while exactly such particles, when falling further down, will tend to whirl, in particular through the air turbulences still occurring in the closed space 1.
  • the conveyor belt can be arranged in the conveying direction at a specific angle upwardly. In that case, to obtain an equivalent particle separation, the drop height can be slightly reduced.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Abstract

L'invention concerne un dispositif de séparation aérodynamique de particules en fonction de leur taille, forme, densité, résistance de frottement, etc. Ce dispositif comprend un transporteur à courroie sur lequel les particules à séparer sont placées de manière à ce qu'elles tombent dudit transporteur à courroie, au niveau de l'extrémité de ce dernier, à la même vitesse d'au moins 3,5 à 4 m/s. Le transporteur à courroie comporte un organe qui est conçu pour amener les particules qui tombent à sa surface dans un état correspondant sensiblement au repos et pour les maintenir dans cet état, jusqu'à ce qu'elles tombent de la courroie et décrivent ensuite des trajectoires spécifiques dans l'air. Le mouvement des particules quittant le transporteur à courroie se déroule dans un espace fermé, la hauteur minimale de chute des particules parcourant la plus grande distance suivant l'horizontale étant d'environ 4 m, en particulier d'environ 5 m, et de préférence d'environ 6 m. En outre, des organes collecteurs sont disposés, les uns derrière les autres, dans le plan des trajectoires dans l'air des particules de manière à permettre la collecte desdites particules séparées en catégories.
PCT/NL2000/000185 1999-03-22 2000-03-20 Dispositif de separation aerodynamique de particules Ceased WO2000056472A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34654/00A AU3465400A (en) 1999-03-22 2000-03-20 Device for aerodynamically separating particles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1011628 1999-03-22
NL1011628A NL1011628C2 (nl) 1999-03-22 1999-03-22 Inrichting voor het aërodynamisch scheiden van deeltjes.

Publications (1)

Publication Number Publication Date
WO2000056472A1 true WO2000056472A1 (fr) 2000-09-28

Family

ID=19768886

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2000/000185 Ceased WO2000056472A1 (fr) 1999-03-22 2000-03-20 Dispositif de separation aerodynamique de particules

Country Status (3)

Country Link
AU (1) AU3465400A (fr)
NL (1) NL1011628C2 (fr)
WO (1) WO2000056472A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100395040C (zh) * 2005-12-08 2008-06-18 安徽精通科技有限公司 微电子封装锡球抛射筛选方法
EP2412452A1 (fr) * 2010-07-28 2012-02-01 Inashco R&D B.V. Appareil de séparation
CN103406257A (zh) * 2013-09-02 2013-11-27 山东理工大学 一种马铃薯薯石分离设备
US9221061B2 (en) 2011-02-28 2015-12-29 Inashco R&D B.V. Eddy current separation apparatus, separation module, separation method and method for adjusting an eddy current separation apparatus
US9409210B2 (en) 2008-04-02 2016-08-09 Adr Technology B.V. Separation-apparatus
CN116809410A (zh) * 2023-06-30 2023-09-29 石家庄英立粮机科技有限公司 一种重力分选机
CN118162358A (zh) * 2024-04-15 2024-06-11 云南国钛金属股份有限公司 一种海绵钛产品中缺陷料的筛选方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR944137A (fr) * 1946-04-08 1949-03-28 Simon Ltd Henry Procédé et dispositif de séparation des produits de mouture
FR975556A (fr) * 1942-02-19 1951-03-07 Traitement Ind Des Residus Urb Procédé et installation pour le classement de matières hétérogènes et en particulier de déchets divers
DE1954611A1 (de) * 1969-10-30 1971-05-13 Wolfgang Gerlach Klassierung von Stoffen unterschiedlicher Wichte und Korngroesse
EP0064123A2 (fr) * 1981-04-23 1982-11-10 DANECO-DANIELI ECOLOGIA Spa Dispositif aérobalistique pour séparer les composants de déchets urbains solides prétraités
DE4226635A1 (de) * 1992-08-12 1994-02-17 Herbold Gmbh Maschinenfabrik Verfahren zum Zerkleinern und Sortieren von Rest- oder Abfallstoffen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR975556A (fr) * 1942-02-19 1951-03-07 Traitement Ind Des Residus Urb Procédé et installation pour le classement de matières hétérogènes et en particulier de déchets divers
FR944137A (fr) * 1946-04-08 1949-03-28 Simon Ltd Henry Procédé et dispositif de séparation des produits de mouture
DE1954611A1 (de) * 1969-10-30 1971-05-13 Wolfgang Gerlach Klassierung von Stoffen unterschiedlicher Wichte und Korngroesse
EP0064123A2 (fr) * 1981-04-23 1982-11-10 DANECO-DANIELI ECOLOGIA Spa Dispositif aérobalistique pour séparer les composants de déchets urbains solides prétraités
DE4226635A1 (de) * 1992-08-12 1994-02-17 Herbold Gmbh Maschinenfabrik Verfahren zum Zerkleinern und Sortieren von Rest- oder Abfallstoffen

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100395040C (zh) * 2005-12-08 2008-06-18 安徽精通科技有限公司 微电子封装锡球抛射筛选方法
US10052660B2 (en) 2008-04-02 2018-08-21 Adr Technology B.V. Separation-apparatus
US9409210B2 (en) 2008-04-02 2016-08-09 Adr Technology B.V. Separation-apparatus
KR101676905B1 (ko) 2010-07-28 2016-11-16 에이디알 테크놀로지 비.브이. 분리 장치
EP2412452A1 (fr) * 2010-07-28 2012-02-01 Inashco R&D B.V. Appareil de séparation
WO2012015299A1 (fr) * 2010-07-28 2012-02-02 Inashco R&D B.V. Appareil de séparation
KR20140016229A (ko) * 2010-07-28 2014-02-07 아이나쉬코 알 앤드 디 비. 브이. 분리 장치
US9033157B2 (en) 2010-07-28 2015-05-19 Inashco R&D B.V. Separation apparatus
US9339848B2 (en) 2010-07-28 2016-05-17 Adr Technology B.V. Separation apparatus
US9221061B2 (en) 2011-02-28 2015-12-29 Inashco R&D B.V. Eddy current separation apparatus, separation module, separation method and method for adjusting an eddy current separation apparatus
CN103406257A (zh) * 2013-09-02 2013-11-27 山东理工大学 一种马铃薯薯石分离设备
CN116809410A (zh) * 2023-06-30 2023-09-29 石家庄英立粮机科技有限公司 一种重力分选机
CN118162358A (zh) * 2024-04-15 2024-06-11 云南国钛金属股份有限公司 一种海绵钛产品中缺陷料的筛选方法

Also Published As

Publication number Publication date
NL1011628C2 (nl) 2000-09-27
AU3465400A (en) 2000-10-09

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