EP1079938B1 - Apparatus for sorting of chips - Google Patents

Apparatus for sorting of chips Download PDF

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Publication number
EP1079938B1
EP1079938B1 EP99925051A EP99925051A EP1079938B1 EP 1079938 B1 EP1079938 B1 EP 1079938B1 EP 99925051 A EP99925051 A EP 99925051A EP 99925051 A EP99925051 A EP 99925051A EP 1079938 B1 EP1079938 B1 EP 1079938B1
Authority
EP
European Patent Office
Prior art keywords
chips
funnel
sorting device
chipper
chip
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.)
Expired - Lifetime
Application number
EP99925051A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1079938A1 (en
Inventor
Hannu Tähkänen
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.)
Metso Paper Pori Oy
Original Assignee
Metso Paper Pori Oy
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Filing date
Publication date
Application filed by Metso Paper Pori Oy filed Critical Metso Paper Pori Oy
Publication of EP1079938A1 publication Critical patent/EP1079938A1/en
Application granted granted Critical
Publication of EP1079938B1 publication Critical patent/EP1079938B1/en
Anticipated expiration legal-status Critical
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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
    • 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
    • B07B4/025—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets

Definitions

  • This invention relates to an apparatus for the sorting of chips.
  • the chips are sorted into accepted and rejected fractions by their specific weight and size
  • Chip screening is used in the paper and pulp industry to produce geometrically uniform chips so that in the Kraft process, for example, as high a digestion degree as possible and as low a overcooking degree as possible can be obtained at the same time.
  • the chip sorting art includes different kinds of screens of which the best known is the flat screen. It is described, for example, in patent publication FI 79251.
  • the screening surfaces of a flat screen are usually provided with round holes.
  • the chip flow is divided into flows according to the diameters of the holes.
  • Thickness screening devices screen well and sort the chips accurately into fractions of a desired type by the size and thickness of the chips.
  • the screening result is good only if the thickness-screening device is composed of several parts. Such a composition naturally is expensive.
  • the objective of the current screening methods is to sort the chips on the basis of the geometric form of the chips.
  • Flat screens perform the sorting mostly by the length of the chips, the thickness screening devices even by the thickness of the chips, which is of greater importance to the digestion of the chips. Nevertheless, the right chip length and thickness alone do not guarantee a good digestion result.
  • Trees grown under different growing conditions and not of the same age have different specific weights. Besides, different parts of trees have different specific weights. Digesting chemicals penetrate less efficiently into dense wood, as a result of which chips of the same thickness as the rest of the chips but denser, are not digested in their entirety.
  • a separator for removing foreign elements such as knots and tramp iron from wood chips is disclosed. Chips are distributed across a separator chamber to fall downwardly. One or more high velocity air curtains are directed across the falling stream of chips so that the heavier material falls downwardly and the lighter chips are carried forwardly with the stream of air. One or more adjustable gates are provided at the bottom of the separator chamber to suitable discharge outlets.
  • chips are set into motion by a blowing chipper, and air resistance is applied to the sorting process.
  • the chips are sorted both by their size and by their density.
  • a flat screen 1 sorts the chips into three fractions: into sawdust 2, medium-sized fraction 3 and oversized fraction 4.
  • the sawdust 2 is usually burned together with the bark.
  • the oversized fraction 4 is led to a separate treatment, e.g. to a rechipper.
  • the chips chipped by the rechipper are transported back to the flat screen 1.
  • the middle-sized fraction 3 produced by the flat screen falls down to the ejection rotor 6 of an ejection sorter 5.
  • the rotor rotates in the direction of arrow P and at such a speed that the chips get sufficient kinetic energy to be able to fly into a chip separation chamber 7.
  • the treatment of chips succeeds only if the ejection rotor 6 is wide enough in relation to the amount of chips to be treated.
  • the chips can be distributed evenly over the whole width of the ejection rotor.
  • the speed of rotation of the rotor 6 is adjusted to leave the chips of accepted size and normal density in front of a separating flap 8 in the separation chamber 7, in a funnel 9.
  • the chips that fall into the funnel 9 constitute the accepted fraction.
  • the densest and heaviest chips fly farthest away, so that they fly over the first separating flap 8 and end up in a funnel 10 located after the first separating flap, and in a finishing device 11. This is due to these chips' greater kinetic energy/air resistance ratio that causes a longer flight curve.
  • the separation chamber 7 can also be equipped with a third funnel 12 that serves as a scrap trap.
  • the scrap trap 12 receives all pieces denser than wood, i.e. stones, iron pieces and, possibly, even the heaviest knots that the chips are not to include.
  • the arrows stand for the flight paths of the chips.
  • a current of air 24 can be blown from above by means of nozzles 14 into the chip flow flying from the rotor 6 so as to make the chips separate from each other more effectively.
  • the nozzles can also be placed on the sides or at the back of the chamber so as to increase the air resistance. In this case, the current of air can be perpendicular to or diagonal in relation to the flight path of the chips.
  • separating flaps 8' and 13' are, instead of having an adjustable angle, vertically adjustable according to arrow R.
  • a roll screen 15 is used instead of a separating flap 8 to free the accepted chips of chip pieces of big size, which, however, do not fly far because of their great air resistance.
  • the accepted chips that fall onto the roll screen fall through the spaces between the rolls and end up in the funnel 9, among the accepted chips.
  • the roll screen transports too big or too thick chips on its surface to the funnel 10.
  • the rolls roll in the direction of arrow S.
  • any corresponding device such as a disc screen or the like can be used.
  • blowing is used instead of an ejection rotor.
  • the blowing is generated by a blowing chipper 16 whose blowpipe 17 is directly connected to the separation chamber 7.
  • the disc 18 of the blowing chipper rotates in the direction of the arrow G.
  • the outer periphery of the disc is provided with wings 19 that generate a strong current of air in the blow pipe 17.
  • the centrifugal force moves also the chips to the outer periphery of the chipper. Furthermore, the wings and the air current make the chips fly into the separation chamber 7 along the blowpipe 17 as a result of which no separate conveyors are needed between the chipper and the screening process. As is shown in figure 5, the blowpipe 17 becomes wider in proximity to the separation chamber 7 so that the chip flow can be distributed over the whole width of the separation chamber according to the arrows shown in figure 5. Because no pre-screening is used, even the sawdust is separated in the separation chamber 7. The sawdust falls into a first funnel 20. The accepted fraction falls into the funnel 9, while too big and too thick chips fall into the funnel 10. Besides, it is possible to collect the pieces heavier than wood in a fourth funnel, i.e. in the scrap trap 12. Adjustable flaps 21 are provided between the funnels.
  • the treatment of the chips led into the funnel 10 of the separation chamber 7, which funnel is intended for too big and too thick chips, can be finished, for example, by means of a rechipper, sliver chipper, chip cutting machine or chip flattener 11 as is shown in figures 1, 2 and 3.
  • a disc screen 23 covers a part of the distance, or the whole distance between the mouth of the blowpipe 22 and the funnel 10 of the oversized chips. The disc screen 23 transports the long chips on its surface into the funnel 10 and lets through the sawdust and the accepted chips.
  • One method for finding a suitable separation ratio for the different kinds of chips is to make the ejection ramp 25 pivotable. As is shown in figure 7, the ejection ramp can be turned on its pivot 26 according to arrow G. The initial direction of the flight path of the chips can be changed in the vertical direction by changing the angle of the ejection ramp.
  • the separating flaps 27 can also be spaced apart in the vertical direction, as is shown in figure 7, so that the flaps 27 are horizontal or almost horizontal. The heaviest pieces fly over the topmost flap, while the sawdust falls down underneath the lowermost flap. Thus, the funnels of the different chip sorts are placed, for example, in the same order as in figure 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Sorting Of Articles (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
EP99925051A 1998-05-22 1999-05-17 Apparatus for sorting of chips Expired - Lifetime EP1079938B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI981136 1998-05-22
FI981136A FI104271B1 (sv) 1998-05-22 1998-05-22 Förfarande och anordning för sortering av flis
PCT/FI1999/000422 WO1999061173A1 (en) 1998-05-22 1999-05-17 Method and apparatus for sorting of chips

Publications (2)

Publication Number Publication Date
EP1079938A1 EP1079938A1 (en) 2001-03-07
EP1079938B1 true EP1079938B1 (en) 2005-03-02

Family

ID=8551780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99925051A Expired - Lifetime EP1079938B1 (en) 1998-05-22 1999-05-17 Apparatus for sorting of chips

Country Status (9)

Country Link
EP (1) EP1079938B1 (sv)
AT (1) ATE289879T1 (sv)
BR (1) BR9910486A (sv)
CA (1) CA2333235A1 (sv)
DE (1) DE69923966T2 (sv)
ES (1) ES2237106T3 (sv)
FI (1) FI104271B1 (sv)
ID (1) ID30123A (sv)
WO (1) WO1999061173A1 (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107497703A (zh) * 2017-09-12 2017-12-22 烟台中科蓝德数控技术有限公司 热缩套管分拣装置
CN108355945A (zh) * 2018-02-23 2018-08-03 张炳强 一种茶叶加工用叶末高效分离装置
EP3634654A4 (en) * 2017-06-02 2021-03-03 Skinner, Matthew J. SINGLE AIR FLOW FOR SEPARATING MIXED WASTE INTO THREE FRACTIONS

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD20010022A1 (it) * 2001-02-09 2002-08-09 Pal Srl Apparecchiatura e metodo per la separazione di elementi o materiali eventi differenti dimensioni
FI116898B (sv) * 2003-08-13 2006-03-31 Hormos Nutraceutical Oy Ltd Förbättrad metod för utvinning av hydroximatairesinol
AU2004208745A1 (en) * 2003-09-09 2005-03-24 Metcraft Industries Pty Ltd Air classification of particulate matter
DE102013003909A1 (de) * 2013-03-07 2014-09-11 Kompoferm Gmbh Vorrichtung zum Windsichten von Materialien
CN110449354A (zh) * 2019-08-23 2019-11-15 贵州正山堂普安红茶业有限责任公司 一种新型茶叶筛选设备
CN112191526A (zh) * 2020-11-10 2021-01-08 常德市龙凤米业有限公司 一种具有多级筛分功能的稻谷加工设备及其使用方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1146772B (it) * 1981-04-23 1986-11-19 Daneco Danieli Ecologia Spa Dispositivo aerobalistico di frazionamento dei materiali presenti nei rifiuti solidi urbani pretrattati
WO1987006506A1 (en) * 1986-04-29 1987-11-05 Beloit Corporation High density separator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3634654A4 (en) * 2017-06-02 2021-03-03 Skinner, Matthew J. SINGLE AIR FLOW FOR SEPARATING MIXED WASTE INTO THREE FRACTIONS
CN107497703A (zh) * 2017-09-12 2017-12-22 烟台中科蓝德数控技术有限公司 热缩套管分拣装置
CN108355945A (zh) * 2018-02-23 2018-08-03 张炳强 一种茶叶加工用叶末高效分离装置

Also Published As

Publication number Publication date
DE69923966T2 (de) 2006-04-06
ID30123A (id) 2001-11-08
EP1079938A1 (en) 2001-03-07
FI104271B (sv) 1999-12-15
FI104271B1 (sv) 1999-12-15
CA2333235A1 (en) 1999-12-02
DE69923966D1 (de) 2005-04-07
ES2237106T3 (es) 2005-07-16
BR9910486A (pt) 2001-10-16
ATE289879T1 (de) 2005-03-15
FI981136A0 (sv) 1998-05-22
WO1999061173A1 (en) 1999-12-02

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