US3230989A - Staves for the drum of a log debarker - Google Patents

Staves for the drum of a log debarker Download PDF

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Publication number
US3230989A
US3230989A US280673A US28067363A US3230989A US 3230989 A US3230989 A US 3230989A US 280673 A US280673 A US 280673A US 28067363 A US28067363 A US 28067363A US 3230989 A US3230989 A US 3230989A
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US
United States
Prior art keywords
drum
staves
logs
stave
log
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
US280673A
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English (en)
Inventor
George M Dick
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.)
Ingersoll Rand World Trade Ltd
Original Assignee
Ingersoll Rand World Trade Ltd
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
Priority to FR897019A priority Critical patent/FR1335525A/fr
Priority to GB18282/62A priority patent/GB939567A/en
Priority to CH566862A priority patent/CH392855A/de
Application filed by Ingersoll Rand World Trade Ltd filed Critical Ingersoll Rand World Trade Ltd
Priority to US280673A priority patent/US3230989A/en
Application granted granted Critical
Publication of US3230989A publication Critical patent/US3230989A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B27L1/025—Debarking in rotating drums

Definitions

  • This invention relates to log debarkers and is primarily concerned with staves for the drum of a log debarker.
  • staves of the type having an angular hat section for the drums of log debarkers.
  • staves and in particular the corners adjoining the top of the hat section, are subject to rapid wear as a result of the severe abrasive and pounding action of the logs on such corners of the staves.
  • Another object of the invention is to provide a stave for the drum of a log debarker that has a longer operative life than heretofore known staves.
  • Yet another object of the invention is to provide a stave for the drum of a log debarker constructed and arranged to reinforce the drum structure.
  • Another object of the invention is to provide a stave for the drum of a log debarker that eliminates spalling of slivers off the logs.
  • Another object of the invention is to provide a stave for the drum of a log debarker which minimizes the tendency for logs to jam in between one stave and another.
  • the present invention contemplates an improved type of stave for the drum of a log debarker which comprises an 'arcuate shaped hat portion and straightdiverging side walls secured to the arcuate hat portion.
  • FIGURE 1 is a partly side elevational and partly longitudinal sectional view of the drum of a log debarker
  • FIG. 2 shows enlarged a cross sectional view of one form of stave for a log debarking drum taken along the line 22 of FIG. 1,
  • FIG. 3 shows enlarged a cross sectional view of another form of stave for a log debarking drum taken along the line 33 of FIG. 1, and
  • FIG. 4 is a diagram of one of the staves of the log debarking device according to the invention.
  • FIG. 1 designates a log debarking device comprising two horizontally extending drum sections 12 and 14 axially aligned and mounted to be rotated by a motor (not shown).
  • the drum may be supported for rotation in any suitable manner well known in the art; as for example, rollers (not shown) may he positioned below drum sections 12 and 14 to engage support rings 11 secured to the outer periphery of the drum sections.
  • Drum sections 12 and 14 may be rotatively connected to the motor (not shown) in any suitable manner; as for example, by driving gears (not shown) which are supported in meshing relationship with ring gears 15 "ice secured to the outer periphery of the drum sections by a rive shaft drivably connected to the motor.
  • Drum section 14 is the water containing portion or wet drum of the device including a cylindrical watertight drum wall 16 forming the peripheral wall thereof and having inner and outer end walls 18, 20 with centrally located openings 22, 24, respectively.
  • Drum section 12 is the dry drum of the device and includes a peripheral wall 17 constructed so as to provide a plurality of openings 19 for the escape of bark and water and other material during debarking operations.
  • Drum 12 is also provided with inner and outer end walls 26, 23 having central openings 39, 32, respectively.
  • both drums rotate and wet drum 14 is maintained with water to a level at or slightly below the lower surface of openings 22 and 24.
  • Logs to be debarked after being fed into wet drum 14 through opening 24 are soaked by the water and agitated in the drum, by stave means according to this invention and hereinafter fully explained, so that the logs cascade and rub against each other with the purpose of abrading and loosening the bark from the logs.
  • the logs after being tumbled about in wet drum 14 are discharged through opening 22 into dry drum 12 in which, by means to be explained hereinafter, the process of removing the bark from the logs is continued. From drum 12, the debarked logs are then discharged through opening 32 for further processing. It is to be noted that, when the device is in operation, the water that is continuously supplied to drum 14 overflows into drum 12 from where it is discharged together with the pulverized bark and other material through openings 19.
  • the stave means includes a plurality of staves 36 and 38 secured to the inner periphery of the drums 14 and 12, respectively.
  • the number of staves for the dry drum. and wet drum is determined in accordance with the diameter of the drums and with the requirements for the structural strength of the drums, protection of the drum shell, and for the proper cascading and tumbling action of the logs in the drums during rotation thereof.
  • drum section 14 is provided with preferably sixteen staves 36 while drum section 12 is provided with preferably thirty-two staves 38, the staves being positioned longitudinally and in evenly paced relation on the inner periphery of the associated drums.
  • the height H of the staves is to be held within a predetermined range of from H minimum to H maximum, while the outer radius R of the hat section is to be held substantially constant. Considering the value of R to be 1, the ratio of the height H of the stave relative to the radius R of the hat section of the stave is then within a range of approximately 1.2 to 1 to approximately 1.8 to 1.
  • an angle of 40 formed between the opposing side walls of the stave produces a stave which is not only highly resistant to the extremely heavy pounding action of the logs on the staves but also very effective in cooperating with other staves to prevent jamming or wedging of the logs between the staves.
  • the angle between the face of the stave and the log end contacting the face of the stave diverges toward the drum center permitting the log to move readily from between two staves on continued rotation of the drum.
  • each stave 38 comprises an arcuate shaped portion 40 having opposing straight side walls 42 and flanges 44.
  • Portion 40 of the stave has a shape of a 140 arc of a circle, side walls 42 extending tangentially from portion 40 to form a stave with diverging side walls forming an angle of 40 with each other.
  • Flanges 44 extending laterally outwardly from side walls 42, are slightly tilted relative to the inner surface of drum wall 12 so that when the flanges are held against the inner periphery of drum wall 17, as shown in FIG.
  • each stave 36 comprises a 140 arc of a circle shaped portion 46 having opposing straight side walls 48 extending tangentially from arcuate portion 46, identical to the body portion of staves 38.
  • Staves 36 are flangeless and the end faces of straight side walls 48 are such that when the stave is held against the inner periphery of drum wall 16 as shown in FIG. 3 there is a space between the end faces of straight side walls 48 and drum wall 16 into which metal is introduced when the staves are welded to drum wall 16 such that a weld of maximum strength is provided.
  • drum sections 12 and 14 of log debarking device In operation, when drum sections 12 and 14 of log debarking device are rotated, the logs are moved by the staves upwardly in the direction of rotation of drum sections 12 and 14 resulting in a cascading down on top of one another of the logs and producing the desired action for abrasion and removal of the bark from the logs.
  • staves 36 and 38 by virtue of their rounded shape eliminate spalling of sliver off the logs, such slivers being objectionable in the pulp and necessitating additional screening for the removal of such slivers.
  • the diverging side walls of the staves cooperate with each other to form troughs between the staves having sides converging towards the drum wall to prevent jamming of the logs between the staves.
  • the side walls of the staves are constructed to form troughs between the staves having parallel sides or sides diverging towards the drum wall the logs tend to jam between the staves resulting in inelficient performance of the debarking drums.
  • staves according to this invention are that when the staves are Welded to the interior of their associated drum sections there is formed a box shaped cross section having the moment of inertia or section modulus that is practically uniform in all directions.
  • the sectional moduli through the two axes of the stave are relatively high compared with the sectional area, thus providing resistance to bending in both directions of loading.
  • the stave structure and its mounting on the inner periphery of the drum walls provide rigidity to the drums to ensure a strong and reliable log barking device.
  • the flangeless staves 36 it is to be noted that the omission of the flanges results in saving of material and a lighter weight of the wet drum 14 with no sacrifice with respect to the structural strength of the drum.
  • the provision of saves having flanges-in the dry drum 12 gives additional support to the longitudinally projecting drum wall portions which form the boundary of openings 19.
  • An apparatus for debarking logs comprising:
  • a horizontally disposed, rotatable, cylindrical drum including an imperforate rperipheral drum wall for holding water in said drum;
  • each of said staves including spaced outer side walls inclined towards each other inwardly of said drum and an arcuate wall connecting said side walls inwardly of said drum, the angle formed between said side walls being 40;
  • each of said staves being secured on the interior of said imperforate drum wall by the free ends of said side walls and being of a height that is of a ratio within the range of from 1 to 20 to 1 to 42 of the diameter of said drum.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Paper (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
US280673A 1961-05-11 1963-05-15 Staves for the drum of a log debarker Expired - Lifetime US3230989A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR897019A FR1335525A (fr) 1961-05-11 1962-05-09 Perfectionnement aux machines à écorcer les rondins
GB18282/62A GB939567A (en) 1961-05-11 1962-05-11 Staves for the drum of a log debarker
CH566862A CH392855A (de) 1961-05-11 1962-05-11 Trommel zum Abschälen der Borke von Baumstämmen
US280673A US3230989A (en) 1961-05-11 1963-05-15 Staves for the drum of a log debarker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10942061A 1961-05-11 1961-05-11
US280673A US3230989A (en) 1961-05-11 1963-05-15 Staves for the drum of a log debarker

Publications (1)

Publication Number Publication Date
US3230989A true US3230989A (en) 1966-01-25

Family

ID=26806959

Family Applications (1)

Application Number Title Priority Date Filing Date
US280673A Expired - Lifetime US3230989A (en) 1961-05-11 1963-05-15 Staves for the drum of a log debarker

Country Status (4)

Country Link
US (1) US3230989A (de)
CH (1) CH392855A (de)
FR (1) FR1335525A (de)
GB (1) GB939567A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT352380B (de) * 1977-11-23 1979-09-10 Andritz Ag Maschf Entrindungstrommel fuer waehlbare entrindung im trocken- oder nassverfahren

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1228374A (en) * 1916-02-12 1917-05-29 John J Ross Barking-drum.
US1311226A (en) * 1919-07-29 Barking-drum
US1655628A (en) * 1926-11-15 1928-01-10 Herbert W Guettler Barking drum
US3020943A (en) * 1957-06-18 1962-02-13 Fibre Making Processes Inc Barking drum

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1311226A (en) * 1919-07-29 Barking-drum
US1228374A (en) * 1916-02-12 1917-05-29 John J Ross Barking-drum.
US1655628A (en) * 1926-11-15 1928-01-10 Herbert W Guettler Barking drum
US3020943A (en) * 1957-06-18 1962-02-13 Fibre Making Processes Inc Barking drum

Also Published As

Publication number Publication date
GB939567A (en) 1963-10-16
FR1335525A (fr) 1963-08-23
CH392855A (de) 1965-05-31

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