WO2002083385A1 - Mecanisme d'ecorçage - Google Patents

Mecanisme d'ecorçage Download PDF

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Publication number
WO2002083385A1
WO2002083385A1 PCT/FI2002/000124 FI0200124W WO02083385A1 WO 2002083385 A1 WO2002083385 A1 WO 2002083385A1 FI 0200124 W FI0200124 W FI 0200124W WO 02083385 A1 WO02083385 A1 WO 02083385A1
Authority
WO
WIPO (PCT)
Prior art keywords
trees
debarking
debarking mechanism
conveyor
support surface
Prior art date
Application number
PCT/FI2002/000124
Other languages
English (en)
Inventor
Jouni Havumäki
Pekka Kokko
Bruce Kirkpatrick
Original Assignee
Andritz Oy
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 Andritz Oy filed Critical Andritz Oy
Publication of WO2002083385A1 publication Critical patent/WO2002083385A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/02—Debarking or removing vestiges of branches from trees or logs; Machines therefor by rubbing the trunks against each other; Equipment for wet practice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/10—Debarking or removing vestiges of branches from trees or logs; Machines therefor using rotatable tools

Definitions

  • the invention relates to a debarking mechanism for the excortication or pretreatment of trees for separately performed final barking and for the expulsion of at least some of the removed barks from a wood flow passing through the debarking mechanism, said debarking mechanism comprising a number of rotatable debarking shafts extending parallel to the advancing direction of the trees to be fed therethrough, which are provided with a number of teeth extending beyond the circumferential surface of the shaft and adapted to strip bark off the presently processed trees transversely to the lengthwise direction of the trees and at the same time to convey the trees transversely relative to said shafts, and said shafts, together with the teeth thereof, being adapted to constitute at least a section of a support surface, upon which the presently processed trees travel through the debarking mechanism.
  • a problem with the above type of prior art debarking mechanisms is how to control the time that the trees to be debarked dwell or reside in the debarking mechanism. Excessive dwell time results in wood loss and, on the other hand, insufficient dwell time leaves too much bark on the trees. Dwell time should be readily changeable, depending e.g. on the type of wood to be barked and whether the wood is frozen or unfrozen.
  • Another drawback in the prior known solutions is that, due to the debarking mechanism having a closed end, the trees must be supplied into the debarking mechanism from above, i.e. the trees must be first hoisted up and then lowered or dropped into the debarking mechanism.
  • a debarking mechanism which is characterized in that the debarking mechanism has its end provided with an opening for feeding trees into the debarking mechanism in a direction which corresponds to the advancing direction of the trees within the debarking mechanism itself, and that for feeding the trees, the debarking mechanism has its admission side provided with a conveyor, said conveyor being adapted to positively feed the trees through the opening formed in the end of the debarking mechanism onto said support surface of the debarking mechanism carrying the trees, particularly onto its lower section.
  • the advancement of trees within a debarking mechanism itself can be made totally dependable upon the positive feed of a conveyor functioning as a supply system for the debarking mechanism.
  • Another way of designing a debarking mechanism is of course that, in addition to the feeding action of the conveyor, the debarking mechanism itself provides either an encouraging or discouraging effect on the advancement of trees, e.g. by adjusting the inclination of the debarking mechanism.
  • the conveyor has a feed rate and, if necessary, also a feed force which are preferably regulable.
  • the feed rate regulation may comprise a mere switch for switching the conveyor on or off.
  • the conveyor is adapted to function as a storage for trees to be fed into the debarking mechanism.
  • trees can be supplied onto the conveyor at highly irregular intervals while maintaining a constant wood flow into the debarking mechanism itself.
  • Another influencing factor in terms of the operation of a debarking mechanism is the thickness of a layer of trees supplied onto the conveyor.
  • the maximum distance of an active conveyor section from the admission end of a debarking mechanism is preferably no more than a distance which complies with the average length of trees to be barked in the debarking mechanism.
  • the proper selection of this distance in accordance with the average length of a tree ensures impeccability of the feeding of trees effected by means of a conveyor.
  • the conveyor has its feeding direction and profile arranged in view of allowing also a free movement for trees in the upstream section of a debarking mechanism.
  • a guide element comprising one or more guide surfaces for delivering trees into the debarking mechanism.
  • the guide surface of the guide element guiding the trees is preferably designed, at least in its bottom section, so as to substantially comply with the cross-section of the support surface bearing the trees.
  • the opening provided in the end of the debarking mechanism is dimensioned, at least in its lower part, to be substantially equal to the size of a chute formed by the support surface present in the debarking mechanism, upon which the trees to be processed travel through the debarking mechanism.
  • Fig. 1 shows in a schematic side view a junction between a debarking mechanism and a feeding mechanism.
  • Fig. 2 shows a section along a line II-II in fig. 1.
  • Fig. 3 shows a section along a line III-III in fig. 1.
  • the drawings depict a debarking mechanism 1 which is intended for the excortication or pretreatment of trees 2 for separately performed final barking and for the expulsion of at least some of the removed barks from a wood flow passing through the debarking mechanism.
  • the debarking mechanism 1 is provided with a number of debarking shafts 3, which extend parallel to an advancing direction A of the trees 2 to be fed therethrough and which are rotatable in the direction of an arrow 12 by means of a motor and drive elements, not shown.
  • the debarking shafts 3 are provided with a number of teeth 4 extending beyond the circumferential surface of the shaft 3, which are adapted to strip bark off the presently processed trees 2 transversely to the lengthwise direction of the trees and at the same time to convey the trees transversely relative to the debarking shafts 3.
  • the debarking shafts 3, together with their teeth 4, constitute a section of a support surface upon which the trees 2 to be processed travel through the debarking mechanism 1.
  • the illustrated example includes four debarking shafts 3, which are fitted relative to each other so as to provide an inclined plane.
  • the support surfaces are solid surfaces, which are designed to form, together with the support surface constituted by the debarking shafts, an open-ended chute covering the debarking mechanism 1 from end to end.
  • the chute may have an open top or it may be covered.
  • the debarking mechanism 1 has its end 5 provided with an opening 6 for feeding the trees 2 into the debarking mechanism 1 in a direction S, which is consistent with the advancing direction A for the trees in the debarking mechanism 1 itself. Except for the opening 6, the end 5 is closed by a panel 9 in the illustrated example.
  • the opening 6 provided in the end 5 of the debarking mechanism 1 is dimensioned, at least in its lower part, to be equal to the size of a chute constituted by the support surface present in the debarking mechanism 1, upon which the trees 2 to be processed travel through the debarking mechanism 1.
  • the conveyor 7 which can be any conventional type of conveyor, for example a chain conveyor, is adapted to positively feed the trees 2 through the opening 6 formed in the end 5 of the debarking mechanism 1 onto said support surface of the debarking mechanism bearing the trees 2, especially onto its bottom section.
  • the conveyor 7 has its feed rate and/or feed force adapted to be regulable in a per se known manner.
  • the conveyor 7 is adapted to function as a storage for the trees 2 to be fed into the debarking mechanism 1.
  • the maximum distance for an active section of the conveyor 7 from the admission end of the debarking mechanism 1 is no more than a distance L, which corresponds to the average length of trees to be treated in the debarking mechanism 1.
  • the feeding direction S of the conveyor 7 is at least roughly the same as the wood advancing direction A within the debarking mechanism 1.
  • the support surface of the conveyor 7, used for guiding the trees 2 has a cross-section which is designed, at least in its bottom part, to substantially comply with that of the support surface of the debarking mechanism 1 used for bearing the trees 2.
  • the actual conveyor 7 is provided alongside the same, at least over the section near the end 5 of the debarking mechanism 1, with side panels 10, 11.
  • a guide element 8 comprising one or more guide surfaces for guiding the trees 2 into the debarking mechanism 1.
  • the guide element 8 has its guide surface, at least in its lower section, designed to be substantially consistent with the cross-section of the support surface of the debarking mechanism 1 used for bearing the trees.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Abstract

L'invention concerne un mécanisme d'écorçage (1), utilisé pour décortiquer ou prétraiter des arbres (2), en vue de l'écorçage final effectué séparément et de l'expulsion d'au moins certaines parties de l'écorce enlevées d'un flot de pièces de bois traversant ledit mécanisme d'écorçage. Ce mécanisme d'écorçage comprend une pluralité d'arbres d'écorçage (3) rotatifs qui s'étendent parallèlement au sens d'avancement (A) des arbres (2) destinés à traverser ledit mécanisme, ces arbres étant pourvus d'une pluralité de dents (4) s'étendant à partir de leur surface circonférentielle et conçues pour enlever l'écorce des arbres (2) en cours de traitement, cela transversalement par rapport à l'axe longitudinal de ceux-ci, et également simultanément pour transporter ces arbres transversalement par rapport audits arbres (3) du mécanisme. Ces arbres (3), avec leurs dents (4), sont conçus pour constituer au moins une section d'une surface de support sur laquelle les arbres (2) en cours de traitement traversent le mécanisme d'écorçage. Le mécanisme d'écorçage (1) est pourvu, à son extrémité (5), d'une ouverture (6) par laquelle les arbres (2) sont introduits dans le mécanisme d'écorçage (1), dans le sens (S) qui correspond au sens d'avancement (A) des arbres dans le mécanisme d'écorçage (1) lui-même. Pour permettre l'introduction des arbres (2) dans le mécanisme d'écorçage (1), celui-ci comporte, sur son côté d'entrée, un convoyeur (7) qui est conçu pour introduire complètement les arbres (2) dans l'ouverture (6) formée à l'extrémité (5) du mécanisme d'écorçage (1), de façon qu'ils arrivent sur ladite surface de support du mécanisme d'écorçage portant les arbres (2), en particulier sur sa section inférieure.
PCT/FI2002/000124 2001-04-11 2002-02-15 Mecanisme d'ecorçage WO2002083385A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20010753 2001-04-11
FI20010753A FI114621B (fi) 2001-04-11 2001-04-11 Kuorintalaite

Publications (1)

Publication Number Publication Date
WO2002083385A1 true WO2002083385A1 (fr) 2002-10-24

Family

ID=8560965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2002/000124 WO2002083385A1 (fr) 2001-04-11 2002-02-15 Mecanisme d'ecorçage

Country Status (2)

Country Link
FI (1) FI114621B (fr)
WO (1) WO2002083385A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228440A (en) * 1964-01-22 1966-01-11 Ingersoll Rand Canada Log debarking apparatus
US5394912A (en) * 1993-08-04 1995-03-07 Real Search Inc. Wood fibre debris processor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228440A (en) * 1964-01-22 1966-01-11 Ingersoll Rand Canada Log debarking apparatus
US5394912A (en) * 1993-08-04 1995-03-07 Real Search Inc. Wood fibre debris processor

Also Published As

Publication number Publication date
FI20010753A0 (fi) 2001-04-11
FI20010753A (fi) 2002-10-12
FI114621B (fi) 2004-11-30

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