EP2671648A1 - Rotorkörper für eine Sortiersiebvorrichtung zum Sortieren von Abfallstoffen - Google Patents

Rotorkörper für eine Sortiersiebvorrichtung zum Sortieren von Abfallstoffen Download PDF

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Publication number
EP2671648A1
EP2671648A1 EP12170723.6A EP12170723A EP2671648A1 EP 2671648 A1 EP2671648 A1 EP 2671648A1 EP 12170723 A EP12170723 A EP 12170723A EP 2671648 A1 EP2671648 A1 EP 2671648A1
Authority
EP
European Patent Office
Prior art keywords
rotor body
rotor
body according
bodies
sorting
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Withdrawn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
EP12170723.6A
Other languages
English (en)
French (fr)
Inventor
Jan Benjamins
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.)
BOLLEGRAAF PATENTS AND BRANDS BV
Original Assignee
BOLLEGRAAF PATENTS AND BRANDS BV
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 BOLLEGRAAF PATENTS AND BRANDS BV filed Critical BOLLEGRAAF PATENTS AND BRANDS BV
Priority to EP12170723.6A priority Critical patent/EP2671648A1/de
Publication of EP2671648A1 publication Critical patent/EP2671648A1/de
Withdrawn legal-status Critical Current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
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens
    • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers
    • B07B1/155—Roller screens using corrugated, grooved or ribbed rollers the rollers having a star shaped cross section
    • 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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4618—Manufacturing of screening surfaces
    • 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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning

Definitions

  • the invention relates to a rotor body for a sorting screen for sorting waste according to the introductory portion of claim 1 and to a sorting screen including such a rotor body.
  • a rotor body and such a sorting screen are known from German Auslegeschrift 1 021 200 in the form of a sorting screen for removing mud and the like from agricultural products such as sugar beets.
  • Sorting screens with rotor bodies for sorting material generally comprise a row of rotatable, driven shafts mutually spaced in a conveying direction.
  • the shafts each extend transversally to the conveying direction and each carry a row of radially extending rotor bodies for intermittently urging material on the sorting screen upward and in conveying direction.
  • the rotor bodies of each of the rows are mutually spaced in longitudinal direction of the respective shaft and rotary trajectories of the rotor bodies carried by each of the shafts project between rotary trajectories of the rotor bodies carried by a neighboring one of the shafts.
  • Such rotor bodies are also known as star bodies but are not necessarily star-shaped in a narrow-sense.
  • the rotor bodies have circumferentially distributed radial projections, such as fingers or top portions of a wavy pattern, for effectively entraining material over the sorting screen as the rotor bodies are rotated in a common sense of rotation.
  • European patent 0 773 070 and European patent 0 925 847 disclose sorting screens that can for instance be used for sifting waste, wherein the waste has to be separated in a crude and fine fraction or in a stiff (e.g. cardboard) and flexible (e.g. paper) fraction.
  • the sizes and shapes of the passages between most adjacent rotor bodies and between the rotor bodies and most adjacent shafts determine the maximum dimensions and/or stiffness of the objects that drop through the sorting screen.
  • all the shafts of the sorting screen rotate in the same sense of rotation, so that material moves over the screen and the fraction which is left on the screen is separated from the fraction of the material that drops through the sorting screen. In this way it is also effected that an object which is too large for the passage will not block the passage, because adjacent to every passage a rotor body section is present which moves upwardly, so that the object is engaged and entrained upwardly away from the passage.
  • this object is achieved by providing a rotor body according to claim 1.
  • the invention can also be embodied in a sorting screen according to claim 14.
  • the first material of the central portion is more elastic than the second material of which at least the outermost parts of the radial projections are made
  • a resilient rotor body is obtained, that can bend sideways relatively easily when objects become stuck between adjacent rotor bodies and thereby allow such object to be expelled from between the rotor bodies without exerting excessively high forces onto the rotor bodies.
  • the resilient characteristics of the rotor bodies allow impact energy of heavy hard items hitting the rotor bodies to be absorbed relatively smoothly, such that the exertion of high peak loads onto the rotor bodies is avoided. Accordingly, the rotors may be of a lighter construction. Also, noise emissions due to impacts of objects against the rotor bodies are reduced. Nevertheless, due to the relatively less elastic second material of which at least outermost parts of the radial projections are made, the rotor bodies are wear resistant and have a long life span.
  • the sorting screen 1 is equipped with a row of rotatable shafts 2 mutually spaced in a conveying direction 18 and drivable in a common sense of rotation.
  • Each shaft 2 extends transversally to the conveying direction 18.
  • the shafts are coupled in a manner known per se to a motor via a drive train.
  • Each of the shafts 2 carries a row of radially projecting rotor bodies 3 for intermittently urging material on the sorting screen conveyor upward and in conveying direction 18 when the shafts 2 are driven for rotation in a sense in which the upper parts of the rotor bodies 3 move with a directional component in the conveying direction 18.
  • the rotor bodies 3 of each of the rows are mutually spaced in longitudinal direction 19 of the respective shaft 2.
  • the circumference of each rotor body 3 moves rotationally along a rotary trajectory and the rotary trajectories of the rotor bodies 3 carried by each of the shafts 2 project between rotary trajectories of the rotor bodies 3' carried by a neighboring one of the shafts 2.
  • the sorting screen thus sieves material that is sufficiently small and/or flexible to pass through the openings from larger and/or stiffer materials that are passed over the sorting screen sieve in the conveying direction.
  • the intermitted motion imparted onto the material to be sorted loosens material that is clinging together and brings objects of the material that has not dropped through above next openings in different orientations, so that most objects that can drop through when in a suitable orientation do eventually drop through the sorting screen.
  • a first example of a rotor body 3 is shown, having a hub 5 and an outer circumference 10 having a number of radial projections 4.
  • the hub 5 forms a central body portion extending around a square hole 7 forming a central passage for receiving a shaft 2.
  • the square shape of the hole 7 locks the rotor body 3 against rotation relative to the square shaft 2, so that the rotor body 3 is reliably entrained with rotation of the shaft 2.
  • the rotor body 3 rotates with the shaft 2 around a central axis 6 of the shaft 2, the rotor body 3 and the square hole 7.
  • the central passage may have any other form.
  • a form other than circular such as hexagonal or triangular, is advantageous for providing a form locked fixation about a shaft that is suitably shaped to project outside a largest circular contour within the passage. If the hole is circular a key or room for a key may be provided to reliably entrain the rotor body with rotation of the shaft.
  • the rotor body 3 according to the present example is provided with eight rotor projections 4 projecting radially outwardly from the hub 5 and oriented along a common plane of rotation.
  • the rotor body may be provided with a different number of rotor projections 4.
  • the number of rotor fingers of each rotor body is at least four and more preferably, at least five or six.
  • the sorting screen 1 can for instance sort waste material, such as general household waste, dry co-mingled waste mainly composed of paper, cardboard, glass and plastic waste, or waste paper and cardboard, including flexible, elongated, material, such as fiber, tape, ribbon, rope, cable, wire and/or string material.
  • the shafts 2 and the rotor bodies 3 mounted thereto are rotated in the first sense of circulation 11 in which upper portions of the rotor bodies move in the direction of transport 18.
  • the rotating shafts 2 convey the waste material in the conveying direction 18.
  • a relatively fine and/or flexible fraction of the material falls through the sorting screen 1 and is collected underneath and a relatively coarse and/or stiff fraction of the material is displaced over the sorting screen 1 and discharged from a downstream end portion 21 of the sorting screen 1.
  • At least the surfaces of the projections of rotor body that are leading in the sense of rotation preferably have a width larger than 5 mm and more preferably a width larger than 10 mm.
  • the width is preferably smaller than 100 mm and more preferably smaller than 70 mm.
  • the diameter of the rotary trajectory of the outer contour of the rotor body is preferably larger than 100 mm and more preferably larger than 150 mm and preferably smaller than 1000 mm and more preferably smaller than 700 cm.
  • the central portion of the rotor body 3 is made of a first material, which preferably is a plastic or elastomeric material, for instance rubber. More in general, it is preferred that the first material is quite elastic and preferably has an e-modulus of less than 0.1 GPa and more than 15 MPa, the e-modulus preferably being between 20 - 30 MPa,.
  • the first material is preferably quite soft and preferably has a hardness between 30 Shore A and 90 Shore A, the hardness preferably being between 70 Shore A and 80 Shore A, preferably 73+/-5° Shore A.
  • the outermost parts 8 of the radial projections 4 are of a second material, which is stiffer than the first material.
  • the outermost parts 8 have an exposed portion of the second material and an enclosed portion 9 (indicated in Figure 3 ) of the second material that is embedded and surrounded by the first material of the central portion, so that the parts of the second material are fixed relative to the part of the first material.
  • a ring shaped zone inside of the outermost parts 8 of a second material is exclusively made of the first material, to achieve a high degree of compressibility and flexibility of the rotor body 4.
  • the rotor bodies can be manufactured efficiently by molding the first material around the inserts of the second material.
  • the second material has a melting temperature higher than the melting temperature of the first material.
  • the inserts 13 are generally ring-shaped bodies, of which an outermost ring section, having a first width, forms the exposed portion 8 of each insert 13 and constitutes a portion of the circumferential outer surface 10 of the rotor body 3. Other ring sections of the inserts 13, having a second width smaller than the first width, form the enclosed portions 9 of each insert.
  • Such ring-shaped inserts with only one or more sections of a reduced width can be manufactured efficiently, also in relatively small numbers, from tube material.
  • the inserts 13 include projections 15 having axially exposed ends which leave corresponding openings 16 in the rotor body 3 during molding and are held between opposite molding surfaces of the mould during molding.
  • the outer parts of the radial projections of the second material are evenly distributed over the circumference rotor body to ensure a balanced rotation of the rotor body 3 during operation.
  • the inserts may have anchoring portions that are inserted into the part of the rotor body of the first material and for instance retained in place by one or more snap fit anchorings in an axial passage in the rotor body part of the first material, preferably allowing the snap fit top engage by temporary elastic deformation of the first material until it snaps back as the anchoring reaches its end position.
  • the second material is a metal, to provide an advantageous combination of wear resistance and impact resistance.
  • a second example of a rotor body 53 according to the invention with a hub 55 and a number of rotor projections, in the case rotor fingers 54 is shown.
  • the hub 55 forms a central body portion extending around a square hole 57 forming a central passage for receiving a square shaft 52.
  • the square shape of the hole 57 prevents the rotor body 53 from rotating about a matching square shaft extending through the hole 7, so that the rotor body 53 is reliably entrained with rotation of the shaft.
  • the rotor body 53 is provided with six rotor fingers 54 projecting radially outwardly from the hub 55 and oriented along a common plane of rotation.
  • the preferred dimensions for waste sorting are the same as those for the example according to Figures 2-4 , although for specific applications small differences between optimal widths and diameters may occur.
  • Each rotor finger 54 has a proximal end 58 from where the rotor finger 54 projects radially away from the hub 55 and a distal end 59 opposite its proximal end 58. Between the proximal end 58 and the distal end 59, each rotor finger 54 has a leading surface 60 facing in a first circumferential sense 61, and a trailing surface 62 facing in a second circumferential sense 63 opposite to the first circumferential sense 61 as well as side surfaces between the leading and trailing surfaces 60, 62.
  • Each leading surface 60 is curved in the second circumferential sense 63 from at least closely adjacent to the proximal end 68 to the distal end 69. Seen in side view, planes 64-66 intersecting the central axis 66 intersect the leading surface 60 at angles ⁇ , ⁇ ' and ⁇ " respectively. These angles are measured relative to a respective tangent of the curved leading surface 60 at the point of intersection with the respective intersecting plane 64-66.
  • the curvature of the leading surfaces 60 is such that along each leading surface 60, from the proximal end 68 to the distal end 69, the angles ⁇ , ⁇ ' and ⁇ " are continuously larger than 45°.
  • the outermost parts 78 of the fingers are made of a second material that is stiffer and harder than the first material of which a further part of the rotor body 54 is made, a more wear resistant rotor body 54 is achieved which is nevertheless flexible and impact resistant to avoid exertion of large forces when large stiff items are caught between neighboring rotor bodies.
  • the proximal portions of the fingers are made of the first material only. The extent to which stringy material tends to cling to the rotor fingers is further reduced, because the second material has a smaller coefficient of friction relative to plastic materials than the first material.
  • a ring-shaped portion of the rotor body 54 extending radially inside of the parts 78 of the second material is made exclusively of the relatively flexible first material.
  • the distal ends 69 of the rotor fingers 64 define a circumference of a rotary trajectory 67 of the rotor body 63 if the rotor body 63 is rotated about the central axis 66 and are evenly distributed over the circumference of the rotary trajectory 67.
  • the maximum distance between successive rotor fingers of a rotor body at a given number of rotor fingers of given dimensions is minimized.
  • each rotor finger 64 has a distal end that constitutes a cylindrical roller surface portion over which waste can move in conveying direction temporarily without being imparted any vertical displacement. This results in a more smooth movement of the waste, which is also advantageous for reducing the tendency of material to cling to the rotor fingers.
  • the outermost parts 78 of the second material are constituted by inserts.
  • the inserts 78 have a curved outer surface, having a first width, which forms the exposed portion 79 of each insert 78.
  • the curved outer surface of the exposed section 79 constitutes a smooth continuation of the circumferential outer surface 60 of the rotor body 53.
  • the inserts 78 further comprise an anchoring portion opposite the outer surface, in this embodiment having a linearly extending surface, having a second width smaller than said first width, which anchoring portion forms the enclosed portion 80 of the insert.
  • the inserts 78 include projections 81 having axially exposed ends which snap fit in corresponding openings in the rotor body 53.
  • fixation of the inserts within the rotor body can be realized by other means than projections and corresponding openings, for example by bolts or screws.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP12170723.6A 2012-06-04 2012-06-04 Rotorkörper für eine Sortiersiebvorrichtung zum Sortieren von Abfallstoffen Withdrawn EP2671648A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12170723.6A EP2671648A1 (de) 2012-06-04 2012-06-04 Rotorkörper für eine Sortiersiebvorrichtung zum Sortieren von Abfallstoffen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12170723.6A EP2671648A1 (de) 2012-06-04 2012-06-04 Rotorkörper für eine Sortiersiebvorrichtung zum Sortieren von Abfallstoffen

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EP2671648A1 true EP2671648A1 (de) 2013-12-11

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EP12170723.6A Withdrawn EP2671648A1 (de) 2012-06-04 2012-06-04 Rotorkörper für eine Sortiersiebvorrichtung zum Sortieren von Abfallstoffen

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4201535A1 (de) * 2021-12-21 2023-06-28 Sandvik SRP AB Scheibe, abstandhalter und transportanordnung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0773070A1 (de) 1996-09-18 1997-05-14 Machinefabriek Bollegraaf Appingedam B.V. Sortierförderer zur Sortierung von Altpapier aus Altkarton
EP0861696A1 (de) * 1997-02-27 1998-09-02 Ernst Josef Kronenberger Scheibe für ein Scheibensieb oder einen Scheibenseparator
EP0925847A1 (de) 1997-12-24 1999-06-30 Machinefabriek LUBO B.V. Sternscheibensieb
EP1005918A2 (de) * 1998-12-05 2000-06-07 Asea Brown Boveri AG Siebförderrost
US20110094944A1 (en) * 2009-07-24 2011-04-28 Suncor Energy Inc. Screening disk, roller, and roller screen for screening an ore feed

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0773070A1 (de) 1996-09-18 1997-05-14 Machinefabriek Bollegraaf Appingedam B.V. Sortierförderer zur Sortierung von Altpapier aus Altkarton
EP0861696A1 (de) * 1997-02-27 1998-09-02 Ernst Josef Kronenberger Scheibe für ein Scheibensieb oder einen Scheibenseparator
EP0925847A1 (de) 1997-12-24 1999-06-30 Machinefabriek LUBO B.V. Sternscheibensieb
EP1005918A2 (de) * 1998-12-05 2000-06-07 Asea Brown Boveri AG Siebförderrost
US20110094944A1 (en) * 2009-07-24 2011-04-28 Suncor Energy Inc. Screening disk, roller, and roller screen for screening an ore feed

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4201535A1 (de) * 2021-12-21 2023-06-28 Sandvik SRP AB Scheibe, abstandhalter und transportanordnung
WO2023117628A1 (en) 2021-12-21 2023-06-29 Sandvik Srp Ab Disc, spacer and transportation assembly

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