EP1362643A1 - Apparatus and method to screen materials having different sizes and/or density - Google Patents

Apparatus and method to screen materials having different sizes and/or density Download PDF

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Publication number
EP1362643A1
EP1362643A1 EP03010771A EP03010771A EP1362643A1 EP 1362643 A1 EP1362643 A1 EP 1362643A1 EP 03010771 A EP03010771 A EP 03010771A EP 03010771 A EP03010771 A EP 03010771A EP 1362643 A1 EP1362643 A1 EP 1362643A1
Authority
EP
European Patent Office
Prior art keywords
screening
gap
fractions
rollers
screening rollers
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.)
Withdrawn
Application number
EP03010771A
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German (de)
English (en)
French (fr)
Inventor
Romeo Paladin
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.)
Pal SRL
Original Assignee
Pal SRL
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 Pal SRL filed Critical Pal SRL
Publication of EP1362643A1 publication Critical patent/EP1362643A1/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/023—Cleaning wood chips or other raw materials
    • 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
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens
    • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers

Definitions

  • the present invention concerns an apparatus and a method to screen and separate materials with different sizes and/or density, such as for example pieces, chips or shavings of wood, and at the same time to eliminate, or discard, the impurities which have a greater density than that of the materials to be accepted, such as for example metal pieces or stones of a greater or smaller size.
  • the apparatus comprises a plurality of screening rollers, each one having its outer surface shaped in such a manner as to define a plurality of protruding elements (22) alternated to corresponding grooves.
  • the screening rollers are parallel to each other and arranged so that their cusps are inserted, more or less deeply, into the grooves of an adjacent roller.
  • the rollers all together define a screening plane which is divided into two or more fractions, one adjacent to the other, in each of which the screening rollers are separated from each other so as to define a gap of a determinate value, different from that of the other fractions.
  • at least one screening roller has the protruding elements reduced, beveled or rounded so as to obtain sections of passage which are locally greater, without varying the gap between the screening rollers.
  • the state of the art includes various devices, including that described in the Italian patent IT-A-1.290.736 which belongs to the same Applicant.
  • This known device comprises a plurality of rollers, all rotating in the same direction, which face each other so that the cusps of each roller are inserted into the corresponding V-shaped grooves of the adjacent rollers, thus defining a zigzag discharge profile.
  • the rollers are also separated laterally so as to define between them adjustable gaps, through which only the pieces of a size equal to or less than the gaps themselves can pass.
  • This known apparatus although it is very efficacious in separating and dividing relatively small pieces, that is, which have a size of a few millimeters, is not able to separate, in the best possible way, pieces of material with a higher density, like pieces of metal or stone, from the rest of the materials with a lower density, such as wood or similar.
  • the state of the art also includes an apparatus wherein the screening rollers are divided into two fractions having different gaps and wherein, in order to divide the higher density materials from the lower density materials, at the end of each fraction the screening rollers are separated from each other by a wider gap than that of the same fraction.
  • the purpose of the invention is to achieve an apparatus and perfect a method to screen and separate materials having different sizes, particularly but not exclusively pieces, chips or shavings of wood, and the same time eliminate or discard the impurities or improper materials with a greater density than that of the materials to be accepted, such as for example pieces of metal or stone.
  • the apparatus comprises a plurality of screening rollers, each one having the outer surface shaped in such a manner as to define a plurality of protruding elements, constituted by teeth, cusps, or similar elements.
  • the screening rollers are parallel to each other and arranged so that their protruding elements are inserted, more or less deeply, into corresponding grooves of an adjacent roller. All the screening rollers together define a screening plane which is divided into one or more fractions, one adjacent to the other, in each of which the screening rollers are separated from each other so as to define a gap of a determinate value, different from that of the other fractions.
  • at least one screening roller has the protruding elements reduced, beveled or rounded, so as to obtain zones of passage which are locally greater, without varying the interaxis between the screening rollers and hence the gap.
  • the gap between the screening rollers is constant.
  • the zones of greater section, as mentioned above, made in correspondence with the protruding elements, even if reduced, beveled or rounded, at intervals with lateral zones with a constant gap, have the advantage that they prevent an excessive quantity of material which should be accepted from being discarded together with the improper material which is in fact to be discarded.
  • the position and number of the screening rollers with the protruding elements reduced, beveled or rounded can vary within the field of each fraction of the screening plane, so that the apparatus according to the invention is very versatile and the layout can easily be varied.
  • conveyor means comprising for example a horizontal screw.
  • an apparatus 10 to separate materials 11 having different sizes and/or density, comprises a metal bearing structure 12, substantially shaped like a parallelepiped and able to define a separation chamber 13, open downwards, on one side of which, through a hopper type mouth 15, an incoherent mass of material 11 is able to be introduced.
  • the latter can consist of pieces of woody material, mixed with impurities of other material with a higher density, for example iron or stone material.
  • the screening rollers 16 are made to rotate, all in a clockwise direction (fig. 1), by motor means of a conventional type and not shown in the drawings.
  • Each roller 16 comprises a plurality of screening elements 20 adjacent to each other; they are advantageously made of metal, rubber or synthetic material, and have cusps 22 (figs. 3 and 4).
  • Each screening roller 16 is mounted in such a manner that the cusps 22 of the screening elements 20 of each of them is constantly inserted, more or less deeply, into the corresponding grooves 24 of the adjacent roller 16, so as to define discharge gaps 25 with a zigzag profile.
  • the bed of screening rollers 16 is divided into a plurality of fractions, for example three, F1, F2 and F3.
  • the gap 25 between the different screening rollers 16 can be either constant or variable, according to the screening requirements.
  • the amplitude G2 of the gap 25 of the second fraction F2 is greater than the amplitude G1 of the gap 25 of the first fraction F1 and the amplitude G3 of the gap 25 of the third fraction F3 is greater than the amplitude G2 of the gap 25 of the second fraction F2.
  • the sizes of the gaps 25 vary according to the granulometry of the material which is to be screened, that is, to be passed between the rollers 16.
  • G1 can be between 0.3 mm and 1.5 mm
  • G2 can be between 1 mm and 2.5 mm
  • G3 can be between 2 mm and 6 mm.
  • At least one roller 16a of each fraction F1, F2, F3 has the cusps 22 reduced, beveled or rounded, so as to define, in association with the corresponding groove 24 of the adjacent roller 16, zones 30 having an amplitude greater than that of the corresponding gap 25, whether it be G1, G2 or G3.
  • Fig. 3 shows a solution which provides the presence of two rollers 16a, with reduced, beveled or rounded cusps 22, adjacent to each other
  • fig. 4 shows a variant which provides the presence of a single roller 16a, with reduced, beveled or rounded cusps 22.
  • the solution shown in fig. 3 between the two rollers 16a there is a continuity of zones 30 and there are no V-shaped grooves 24.
  • the position of the roller(s) 16a in the field of each fraction F1, F2, F3 is chosen according to the screening requirements and the percentage of improper material in the mass 11 to be eliminated.
  • Each screw 31 is movable horizontally so as to be correctly positioned in correspondence with the rollers 16a above.
  • a pair of conveyor walls 33 associated with each screw 31, there is a pair of conveyor walls 33, substantially vertical, which can be suitably inclined.
  • the screening method of the apparatus 10 as described heretofore comprises a step of introducing the materials 11 through the mouth 15 into the bed of screening rollers 16 in such a manner that the latter, rotating, perform a first screening action in the fraction F1 and allow only the fine materials to pass, with a size less than G1. Due to the action of the rollers 16, the higher density materials tend to be arranged towards the bottom so that, when they reach the zones 30, created by each roller 16a, they naturally fall downwards and are discharged by the screw 31 below. The same action is performed in the subsequent fractions F2 and F3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Sorting Of Articles (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP03010771A 2002-05-16 2003-05-14 Apparatus and method to screen materials having different sizes and/or density Withdrawn EP1362643A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2002UD000105A ITUD20020105A1 (it) 2002-05-16 2002-05-16 Apparecchiatura e metodo per vagliare materiali aventi differenti dimensioni e/o densita'
ITUD20020105 2002-05-16

Publications (1)

Publication Number Publication Date
EP1362643A1 true EP1362643A1 (en) 2003-11-19

Family

ID=11460711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03010771A Withdrawn EP1362643A1 (en) 2002-05-16 2003-05-14 Apparatus and method to screen materials having different sizes and/or density

Country Status (2)

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EP (1) EP1362643A1 (it)
IT (1) ITUD20020105A1 (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1736249A1 (fr) * 2005-06-23 2006-12-27 Caustier France Dispositif de calibrage dimensionnel d'objets sensiblement sphériques ou ovoïdes tels que des fruits
WO2010049748A1 (en) * 2008-10-30 2010-05-06 Globus S.R.L. Cam-based classifier for the treatment of heterogeneous masses of materials
ITRA20100021A1 (it) * 2010-07-22 2012-01-23 Bmcr S R L Vaglio a rulli.
JP6049840B1 (ja) * 2015-11-10 2016-12-21 株式会社栗本鐵工所 ローラスクリーン
EP2030498B2 (fr) † 2007-08-30 2020-12-02 PELLENC (Société Anonyme) Table de tri à rouleaux trieurs, pour l'élimination des corps étrangers restant mêlés aux produits de la récolte de baies de raisin
IT201900015126A1 (it) * 2019-08-28 2021-02-28 Pal S R L Macchina selezionatrice per la pulizia di materiale incoerente e relativo procedimento di selezione

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE95784C (it) *
EP0727293A1 (en) * 1995-02-15 1996-08-21 Sunds Defibrator Loviisa Oy Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials
WO1998040173A1 (en) * 1997-03-12 1998-09-17 Pal S.R.L. Roller device to separate chips and particles of different gradings, and the relative forming machine employing the device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE95784C (it) *
EP0727293A1 (en) * 1995-02-15 1996-08-21 Sunds Defibrator Loviisa Oy Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials
WO1998040173A1 (en) * 1997-03-12 1998-09-17 Pal S.R.L. Roller device to separate chips and particles of different gradings, and the relative forming machine employing the device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1736249A1 (fr) * 2005-06-23 2006-12-27 Caustier France Dispositif de calibrage dimensionnel d'objets sensiblement sphériques ou ovoïdes tels que des fruits
FR2887479A1 (fr) * 2005-06-23 2006-12-29 Caustier France Sa Dispositif de calibrage dimensionnel d'objets sensiblement spheriques ou ovoides tels que des fruits
EP2030498B2 (fr) † 2007-08-30 2020-12-02 PELLENC (Société Anonyme) Table de tri à rouleaux trieurs, pour l'élimination des corps étrangers restant mêlés aux produits de la récolte de baies de raisin
WO2010049748A1 (en) * 2008-10-30 2010-05-06 Globus S.R.L. Cam-based classifier for the treatment of heterogeneous masses of materials
ITRA20100021A1 (it) * 2010-07-22 2012-01-23 Bmcr S R L Vaglio a rulli.
JP6049840B1 (ja) * 2015-11-10 2016-12-21 株式会社栗本鐵工所 ローラスクリーン
IT201900015126A1 (it) * 2019-08-28 2021-02-28 Pal S R L Macchina selezionatrice per la pulizia di materiale incoerente e relativo procedimento di selezione
WO2021038606A1 (en) * 2019-08-28 2021-03-04 Pal S.R.L. Selector machine to clean incoherent material, and corresponding selection method

Also Published As

Publication number Publication date
ITUD20020105A0 (it) 2002-05-16
ITUD20020105A1 (it) 2003-11-17

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