EP2248602A1 - Sternkörper für eine Sternsiebanlage zum Sortieren von Abfallstoffen - Google Patents

Sternkörper für eine Sternsiebanlage zum Sortieren von Abfallstoffen Download PDF

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Publication number
EP2248602A1
EP2248602A1 EP09159538A EP09159538A EP2248602A1 EP 2248602 A1 EP2248602 A1 EP 2248602A1 EP 09159538 A EP09159538 A EP 09159538A EP 09159538 A EP09159538 A EP 09159538A EP 2248602 A1 EP2248602 A1 EP 2248602A1
Authority
EP
European Patent Office
Prior art keywords
star
screen
shafts
bodies
finger
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Withdrawn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
EP09159538A
Other languages
English (en)
French (fr)
Inventor
Jan Benjamins
Alex Zwiers
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.)
Lubo Screening- & Recyclingsystems Bv
LUBO SCREENING AND RECYCLINGSYSTEMS BV
Original Assignee
Lubo Screening- & Recyclingsystems Bv
LUBO SCREENING AND RECYCLINGSYSTEMS 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 Lubo Screening- & Recyclingsystems Bv, LUBO SCREENING AND RECYCLINGSYSTEMS BV filed Critical Lubo Screening- & Recyclingsystems Bv
Priority to EP09159538A priority Critical patent/EP2248602A1/de
Publication of EP2248602A1 publication Critical patent/EP2248602A1/de
Withdrawn legal-status Critical Current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
    • B07B1/155—Roller screens using corrugated, grooved or ribbed rollers the rollers having a star shaped cross section

Definitions

  • the invention relates to a star body for a star screen for sorting waste, to a star screen including such star body and to a method for sorting waste material.
  • Star screens 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 star bodies for intermittently urging material on the star screen upward and in conveying direction.
  • the star bodies of each of the rows are mutually spaced in longitudinal direction of the respective shaft and rotary trajectories of the star bodies carried by each of the shafts projecting between rotary trajectories of the star bodies carried by a neighbouring one of the shafts.
  • Such screens are known from European patent 0 773 070 and European patent 0 925 847 and for instance used for sifting waste, in which 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 star bodies and between the star bodies and most adjacent shafts determine the maximum dimensions and/or stiffness of the objects which are let through by the star screen.
  • the shafts of the star screen all rotate in the same sense of rotation, so that the material moves over the screen and the fraction which is left on the screen is discharged. In this way it is also effected that an object which is too large for the passage will not block the passage, because adjacent every passage a star 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 star body according to claim 1.
  • the invention can also be embodied in a star screen according to claim 5.
  • the invention can further be embodied in a method according to claim 6.
  • the curvature of the leading surfaces of the star fingers is such that along the leading surface from the proximal end to the distal end, angles at which planes intersecting the central axis intersect the leading surfaces are larger than 45°, elongate flexible waste material prone to being caught by the star fingers and to be entrained and wound around the shaft and/or the star body does to an increased extent slide along the leading star finger surface towards its distal end and off the star finger.
  • the extent to which flexible elongate material tends to wind around the shafts and/or star fingers is reduced.
  • Fig. 1 shows a part of a star screen 1 for separating material, which comprises a row of rotatable, driven shafts 2 mutually spaced in a conveying direction 18.
  • Each shaft extends transversally to the conveying direction 18.
  • the shafts are coupled to a motor via a drive train.
  • Each of the shafts 2 carries a row of radially extending star bodies 3 for intermittently urging material on the sorting conveyor upward and in conveying direction 18.
  • the star bodies 3 of each of the rows are mutually spaced in longitudinal direction 19 of the respective shaft 2.
  • each star body 3 moves rotationally along a rotary trajectory and the rotary trajectories of the star bodies 3 carried by each of the shafts 2 project between rotary trajectories of the star bodies 3' carried by a neighbouring one of the shafts 2. Between neighbouring star bodies and between star bodies and shafts, open passages are left through which waste material that is sufficiently small and/or flexible can drop.
  • the star screen 1 operates in a manner similar to a sieve.
  • a star body 3 with a hub 5 and a number of star fingers 4 is shown.
  • 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 star body 3 against rotation relative to the square shaft 2, so that the star body 3 is reliably entrained with rotation of the shaft 2.
  • the star body 3 rotates with the shaft 2 around a central axis 6 of the shaft 2, the star 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.
  • the star body 3 according to the present example is provided with six star fingers 4 projecting radially outwardly from the hub 5 and oriented along a common plane of rotation.
  • the star body may be provided with a different number of star fingers 4.
  • the number of star fingers of each star body is at least four and more preferably, at least five or six.
  • the star screen 1 can 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 fibre, tape, ribbon, rope, cable, wire and/or string material.
  • 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 fibre, tape, ribbon, rope, cable, wire and/or string material.
  • the shafts 2 and the star bodies 3 mounted thereto are rotated in the first sense of circulation 11 in which upper portions of the star bodies move in the direction of transport 18.
  • waste material is deposited onto an upstream end portion 20 of the star screen 1
  • the rotating shafts 2 convey the waste material in the conveying direction 18.
  • a first, relatively fine and/or flexible fraction of the material falls through the star screen 1 and is collected underneath and a second, relatively coarse and/or stiff fraction of the material is displaced over
  • Each star finger 4 has a proximal end 8 from where the star finger 4 projects from the hub 5 and a distal end 9 opposite its proximal end 8. Between the proximal end 8 and the distal end 9, each star finger 4 has a leading surface 10 facing in a first circumferential sense 11, and a trailing surface 12 facing in a second circumferential sense 13 opposite to the first circumferential sense 11 as well as side surfaces between the leading and trailing surfaces 10, 12.
  • the leading surface of the star body preferably has a width larger than 5 mm and more preferably larger than 10 mm. The width is preferably smaller than 100 mm and more preferably smaller than 70 mm.
  • At least an outside portion of the star body that contacts material being sorted is preferably made of rubber or other elastomeric material having a hardness of 55 - 100 Shore A.
  • the star body may include a carrier frame of a harder material covered by the rubber or other elastomeric material.
  • the diameter of the rotary trajectory of the star 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.
  • Each leading surface 10 is curved in the second circumferential sense 13 from at least closely adjacent the proximal end 8 to the distal end 9. Seen in side view, planes 14-16 intersecting the central axis 6 intersect the leading surface 10 at angles ⁇ , ⁇ ' and ⁇ " respectively. These angles are measured relative to a respective tangent of the curved leading surface 10 at the point of intersection with the respective intersecting plane 14-16.
  • the curvature of the leading surfaces 10 is such that along each leading surface 10, from the proximal end 8 to the distal end 9, the angles ⁇ , ⁇ ' and ⁇ " are continuously larger than 45°.
  • the distal ends 9 of the star fingers 4 define a circumference of a rotary trajectory 17 of the star body 3 if the star body 3 is rotated about the central axis 6 and are evenly distributed over the circumference of the rotary trajectory 17.
  • the maximum distance between successive star fingers of a star body at a given number of star fingers of given dimensions is minimized.
  • each star finger 4 the distal end 9 is parallel to a nearest section of the circumference of the rotary trajectory 17.
  • each star finger 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 star fingers and to be wound
  • the rotary trajectories of the star bodies having an outer diameter of 330 mm and a width of 45 mm, approximately 10 % of the flexible elongated material wound about the shafts and star bodies, whereas in a comparable set-up with conventional star bodies of which the star fingers have leading surfaces that were at least partially more parallel to intersecting radially oriented planes, generally about 50 % of the flexible elongated material ended up wound about the shafts and the star bodies.
  • the invention has been illustrated and described in detail in the drawing and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the invention is not limited to the disclosed embodiments.
  • the smallest angles between the planes 14-16 intersecting the central axis and the curved leading surfaces 10 can be larger than 46°, 47°, 50° or even 55°.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP09159538A 2009-05-06 2009-05-06 Sternkörper für eine Sternsiebanlage zum Sortieren von Abfallstoffen Withdrawn EP2248602A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09159538A EP2248602A1 (de) 2009-05-06 2009-05-06 Sternkörper für eine Sternsiebanlage zum Sortieren von Abfallstoffen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09159538A EP2248602A1 (de) 2009-05-06 2009-05-06 Sternkörper für eine Sternsiebanlage zum Sortieren von Abfallstoffen

Publications (1)

Publication Number Publication Date
EP2248602A1 true EP2248602A1 (de) 2010-11-10

Family

ID=41227556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09159538A Withdrawn EP2248602A1 (de) 2009-05-06 2009-05-06 Sternkörper für eine Sternsiebanlage zum Sortieren von Abfallstoffen

Country Status (1)

Country Link
EP (1) EP2248602A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019183616A1 (en) * 2018-03-23 2019-09-26 Lanxess Solutions Us Inc. Sorting disc and method of improving the durability thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1240250A (fr) * 1958-12-09 1960-09-02 Elfa App Vertriebs Gmbh Grille secoueuse à rouleaux pour le lavage des produits de la terre, notamment des betteraves à sucre
AU259866A (en) * 1967-03-08 1968-09-12 An improved screening mechanism
DE9309872U1 (de) * 1993-07-02 1993-08-26 Hülsmann, Werner, 49082 Osnabrück Vorrichtung zum Sieben von Abfällen
DE19500022A1 (de) * 1994-05-05 1996-07-04 Gerhard Dipl Ing Mock Siebvorrichtung
EP0773070A1 (de) 1996-09-18 1997-05-14 Machinefabriek Bollegraaf Appingedam B.V. Sortierförderer zur Sortierung von Altpapier aus Altkarton
EP0925847A1 (de) 1997-12-24 1999-06-30 Machinefabriek LUBO B.V. Sternscheibensieb

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1240250A (fr) * 1958-12-09 1960-09-02 Elfa App Vertriebs Gmbh Grille secoueuse à rouleaux pour le lavage des produits de la terre, notamment des betteraves à sucre
AU259866A (en) * 1967-03-08 1968-09-12 An improved screening mechanism
DE9309872U1 (de) * 1993-07-02 1993-08-26 Hülsmann, Werner, 49082 Osnabrück Vorrichtung zum Sieben von Abfällen
DE19500022A1 (de) * 1994-05-05 1996-07-04 Gerhard Dipl Ing Mock Siebvorrichtung
EP0773070A1 (de) 1996-09-18 1997-05-14 Machinefabriek Bollegraaf Appingedam B.V. Sortierförderer zur Sortierung von Altpapier aus Altkarton
EP0925847A1 (de) 1997-12-24 1999-06-30 Machinefabriek LUBO B.V. Sternscheibensieb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019183616A1 (en) * 2018-03-23 2019-09-26 Lanxess Solutions Us Inc. Sorting disc and method of improving the durability thereof

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