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WO1998000271A1 - Method for renovating a barking drum - Google Patents

Method for renovating a barking drum Download PDF

Info

Publication number
WO1998000271A1
WO1998000271A1 PCT/FI1997/000379 FI9700379W WO9800271A1 WO 1998000271 A1 WO1998000271 A1 WO 1998000271A1 FI 9700379 W FI9700379 W FI 9700379W WO 9800271 A1 WO9800271 A1 WO 9800271A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
barking
bark
plates
shell surface
Prior art date
Application number
PCT/FI1997/000379
Other languages
French (fr)
Inventor
Aulis Nykopp
Kaarlo Vesalainen
Pekka Kokko
Original Assignee
Andritz-Patentverwaltungs-Gmbh
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-Patentverwaltungs-Gmbh filed Critical Andritz-Patentverwaltungs-Gmbh
Priority to AU31772/97A priority Critical patent/AU3177297A/en
Publication of WO1998000271A1 publication Critical patent/WO1998000271A1/en
Priority to SE9804331A priority patent/SE515891C2/en
Priority to NO985952A priority patent/NO985952L/en

Links

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
    • B27L1/04—Debarking or removing vestiges of branches from trees or logs; Machines therefor by rubbing the trunks in rotating drums
    • B27L1/05—Drums therefor

Definitions

  • the present invention relates to a method for renovating an inner drum shell surface of a barking drum, particular- ly a barking drum used in wood processing plants of pulp and paper industry, said barking drum comprising a cylindrical drum, rotatable around its substantially horizontally disposed centre axis, through which tree trunks to be barked are delivered for barking the tree trunk and separating the bark from wood material and which barking drum includes a number of log lifters extending inwards from the inner drum shell surface for lifting, as the drum is rotating, tree trunks to be barked onto the drum wall from where the tree trunks, as the drum continues its rotation, fall down again, whereby the bark subjected to attrition as well as to shocks and pressure as a result of the motion is gradually removed, and which barking drum further includes a number of elongated bark slots openings extending through its inner drum shell surface, at least some of the removed barks being adapted to discharge from the drum therethrough.
  • a method of the invention is carried out and a method of the invention is characterized in that the inner drum shell surface of the barking drum is coated intermit- tently with an annular section at a time, that a new inner surface for the barking drum is compiled from two or more annular sections, and that each annular section is produced by welding a number of form-moulded plates of substantially equal mutual size and shape securely to the inner drum shell surface of the barking drum and to each other.
  • Fig. 1 shows a barking drum in a schematic elevation.
  • Fig. 2 shows a section along a line II-II in fig. 1.
  • Figs. 3, 4, 6, 7 show partial cross-sections of a barking drum renovated with a method of the invention.
  • Fig. 5 shows a section along a line V-V in fig. 4 or respectively in fig. 6.
  • Fig. 8 shows one form-moulded plate for use in a method of the invention, this figure also depicts the deve- lopment of an annular section.
  • Fig. 9 shows a section along a line IX-IX in fig. 8.
  • the barking drum depicted in a side view in fig. 1 and in a sectional view in fig. 2 and designated with reference numeral 1, comprises a cylindrical drum, rotatable around its substantially horizontally disposed centre axis 2, through which tree trunks 3 to be barked are delivered for barking the tree trunk and separating the bark from wood material.
  • the barking drum 1 includes a number of log lifters 5 extending inwards from an inner drum shell surface 4 for lifting, as the drum is rotating, tree trunks 3 to be barked onto the drum wall from where the tree trunks 3, as the drum continues its rotation, fall down again, whereby the bark subjected to attrition as well as to shocks and pressure as a result of the motion is gradually removed.
  • the barking drum 1 further includes a number of elongated bark slots 6 extending through its inner shell surface 4, at least some of the removed barks being adapted to discharge from the drum therethrough.
  • said drum shell surface 4 is coated intermittently with an annular section at a time.
  • the barking drum 1 can always be put back into operation after finishing an annular section and the coating can be continued again during the next suitable production stop. This is continued until the entire required portion of the inner drum shell surface 4 of a barking drum is coated, which usually requires the formation of several annular sections.
  • Coating the barking drum 1 generally requires a plurality of annular sections, which sections can be dissimilar or similar to each other.
  • Each annular section is produced by welding a number of form-moulded plates of substantially equal mutual size and shape over the edges thereof fixed to the inner drum shell surface 4 of the barking drum 1 and to each other.
  • Fig. 8 illustrates one example of a shell plate useful for the purpose. The same figure also reveals (with dash lines) as to how the annular section is produced. In practice, this is carried out by placing one plate at a time into position within the barking drum 1 and by welding it over its edges to the barking drum as well as to the plates that have possibly been brought in and fixed earlier.
  • a typical size for a shell plate 9 shown in fig. 8 is 2000 mm x 500 mm and a typical thickness is 20 mm.
  • the annular section will have a length of 2000 mm in the direction of the centre axis 2 of the barking drum 1.
  • Fig. 4 illustrates a case in which the annular section is made of plates 9 similar to those shown in figs. 8 and 9, said plates being provided with a ridge 15, extending over the entire length of the plate and serving as a log lifter, and with bark slots 16.
  • a shell plate 8 shown in fig. 3 matches the shell plate 9 of fig. 4 with the exception that the plate 8 has no bark slots.
  • the ridge providing a log lifter is fitted on top of the log lifter 5 already included in the barking drum
  • Fig. 6 depicts a shell plate 11 which is shaped to conform to the inner drum shell surface 4 of the barking drum 1.
  • the plate 11 may be provided with bark slots 16, as shown in fig. 6, or it can be a totally intact plate. If necessary, on top of the plate can be welded a ridge 17 to serve as a log lifter.
  • the bark slots 16 in a plate 9, 11 (figs. 4, 5, 6) including such slots are set in alignment with bark slots 6 already included in the barking drum 1 to be renovated.
  • the plate 9, 11 is welded securely to the inner drum shell surface of the barking drum 1 in alignment (18) with the bark openings 6, 16.
  • the bark slot 6 included in the shell surface of the barking drum 1 and shown in fig. 5 has originally been of essentially the same shape and size as the bark slot 16 in the plate 9, 11. By virtue of the new bark slots 16 to be fitted on top of worn-out bark slots 16, the renovated barking drum is again capable of operating as it was originally designed.
  • the annular section can also be produced merely by using a number of plates 10 bent into the shape of a log lifter (fig. 7).
  • plates 8, 9, 11 can be secured by means of per se known plug welds (not shown).

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

The invention relates to a method for renovating an inner drum shell surface (4) of a barking drum (1), said barking drum comprising a cylindrical drum, rotatable around its substantially horizontally disposed centre axis (2), through which tree trunks (3) to be barked are delivered for barking the tree trunk and separating the bark from wood material and which barking drum (1) includes a number of log lifters (5) extending inwards from the inner drum shell surface (4) and a number of elongated bark slots (6) extending through the inner drum shell surface (4) of the barking drum. The inner drum shell surface (4) of the barking drum (1) is coated intermittently with an annular section at a time. A new inner surface for the barking drum (1) is compiled from two or more annular sections, and each annular section is produced by welding a number of form-moulded plates (8, 9, 10, 11) of substantially equal mutual size and shape securely to the inner drum shell surface (4) of the barking drum (1) and to each other.

Description

Method for renovating a barking drum
The present invention relates to a method for renovating an inner drum shell surface of a barking drum, particular- ly a barking drum used in wood processing plants of pulp and paper industry, said barking drum comprising a cylindrical drum, rotatable around its substantially horizontally disposed centre axis, through which tree trunks to be barked are delivered for barking the tree trunk and separating the bark from wood material and which barking drum includes a number of log lifters extending inwards from the inner drum shell surface for lifting, as the drum is rotating, tree trunks to be barked onto the drum wall from where the tree trunks, as the drum continues its rotation, fall down again, whereby the bark subjected to attrition as well as to shocks and pressure as a result of the motion is gradually removed, and which barking drum further includes a number of elongated bark slots openings extending through its inner drum shell surface, at least some of the removed barks being adapted to discharge from the drum therethrough.
Heretofore, a badly worn-out barking drum shell has been replaced entirely or partly with a shell. Such renovation involves several drawbacks: even the partial replacement of a drum shell requires a downtime of several weeks or even months, the actual work is difficult in cramped spaces as it is sometimes even necessary to open the roof section of a wood room building for lifting and position- ing new drum sections, the installation necessitates that bark chutes be disassembled from around the drum, the procedure is expensive.
Another prior art alternative is the lining of a drum with rubber bars. However, the procedure is tedious and expensive and the shell must be provided with fastening holes for fixing the rubber bars. In order to eliminate the drawbacks of the prior art solutions, a method of the invention is carried out and a method of the invention is characterized in that the inner drum shell surface of the barking drum is coated intermit- tently with an annular section at a time, that a new inner surface for the barking drum is compiled from two or more annular sections, and that each annular section is produced by welding a number of form-moulded plates of substantially equal mutual size and shape securely to the inner drum shell surface of the barking drum and to each other.
Preferred further evolutions of the invention are set forth in the non-independent claims.
By means of a method of the invention, it is possible to strengthen a drum by means of new form-moulded plates welded on the inside, to narrow the excessively worn width of the bark slots, to strengthen the existing worn-out log lifters, to perform the work in short sequences (e.g. just weekends or during short production stops), to perform the work without removing bark chutes from around the drum or the roof of a barking plant building, to perform the work in a fashion substantially more economical than the re- placement of an entire drum shell or the lining of drum with rubber bars.
The invention will now be described in more detail by way of an example with reference made to the accompanying drawings, in which:
Fig. 1 shows a barking drum in a schematic elevation.
Fig. 2 shows a section along a line II-II in fig. 1. Figs. 3, 4, 6, 7 show partial cross-sections of a barking drum renovated with a method of the invention.
Fig. 5 shows a section along a line V-V in fig. 4 or respectively in fig. 6.
Fig. 8 shows one form-moulded plate for use in a method of the invention, this figure also depicts the deve- lopment of an annular section.
Fig. 9 shows a section along a line IX-IX in fig. 8.
The barking drum, depicted in a side view in fig. 1 and in a sectional view in fig. 2 and designated with reference numeral 1, comprises a cylindrical drum, rotatable around its substantially horizontally disposed centre axis 2, through which tree trunks 3 to be barked are delivered for barking the tree trunk and separating the bark from wood material.
The barking drum 1 includes a number of log lifters 5 extending inwards from an inner drum shell surface 4 for lifting, as the drum is rotating, tree trunks 3 to be barked onto the drum wall from where the tree trunks 3, as the drum continues its rotation, fall down again, whereby the bark subjected to attrition as well as to shocks and pressure as a result of the motion is gradually removed. The barking drum 1 further includes a number of elongated bark slots 6 extending through its inner shell surface 4, at least some of the removed barks being adapted to discharge from the drum therethrough.
In a method of the invention for renovating the inner drum shell surface 4 of the barking drum 1 , said drum shell surface 4 is coated intermittently with an annular section at a time. By virtue of this, the work can be sequenced even over relatively short production shut down. The barking drum 1 can always be put back into operation after finishing an annular section and the coating can be continued again during the next suitable production stop. This is continued until the entire required portion of the inner drum shell surface 4 of a barking drum is coated, which usually requires the formation of several annular sections. Coating the barking drum 1 generally requires a plurality of annular sections, which sections can be dissimilar or similar to each other.
Each annular section is produced by welding a number of form-moulded plates of substantially equal mutual size and shape over the edges thereof fixed to the inner drum shell surface 4 of the barking drum 1 and to each other. Fig. 8 illustrates one example of a shell plate useful for the purpose. The same figure also reveals (with dash lines) as to how the annular section is produced. In practice, this is carried out by placing one plate at a time into position within the barking drum 1 and by welding it over its edges to the barking drum as well as to the plates that have possibly been brought in and fixed earlier. A typical size for a shell plate 9 shown in fig. 8 is 2000 mm x 500 mm and a typical thickness is 20 mm. Thus, the annular section will have a length of 2000 mm in the direction of the centre axis 2 of the barking drum 1.
Fig. 4 illustrates a case in which the annular section is made of plates 9 similar to those shown in figs. 8 and 9, said plates being provided with a ridge 15, extending over the entire length of the plate and serving as a log lifter, and with bark slots 16.
A shell plate 8 shown in fig. 3 matches the shell plate 9 of fig. 4 with the exception that the plate 8 has no bark slots. The ridge providing a log lifter is fitted on top of the log lifter 5 already included in the barking drum
1.
Fig. 6 depicts a shell plate 11 which is shaped to conform to the inner drum shell surface 4 of the barking drum 1. The plate 11 may be provided with bark slots 16, as shown in fig. 6, or it can be a totally intact plate. If necessary, on top of the plate can be welded a ridge 17 to serve as a log lifter.
The bark slots 16 in a plate 9, 11 (figs. 4, 5, 6) including such slots are set in alignment with bark slots 6 already included in the barking drum 1 to be renovated. The plate 9, 11 is welded securely to the inner drum shell surface of the barking drum 1 in alignment (18) with the bark openings 6, 16. The bark slot 6 included in the shell surface of the barking drum 1 and shown in fig. 5 has originally been of essentially the same shape and size as the bark slot 16 in the plate 9, 11. By virtue of the new bark slots 16 to be fitted on top of worn-out bark slots 16, the renovated barking drum is again capable of operating as it was originally designed.
The annular section can also be produced merely by using a number of plates 10 bent into the shape of a log lifter (fig. 7).
If necessary, the attachment of plates 8, 9, 11 can be secured by means of per se known plug welds (not shown).

Claims

Claims
1. A method for renovating an inner drum shell surface (4) of a barking drum (1), particularly a barking drum (1) used in wood processing plants of pulp and paper industry, said barking drum comprising a cylindrical drum, rotatable around its substantially horizontally disposed centre axis (2), through which tree trunks (3) to be barked are delivered for barking the tree trunk and separating the bark from wood material and which barking drum ( 1 ) includes a number of log lifters (15) extending inwards from the inner drum shell surface (4) for lifting, as the drum is rotating, tree trunks (3) to be barked onto the drum wall from where the tree trunks (3), as the drum continues its rotation, fall down again, whereby the bark subjected to attrition as well as to shocks and pressure as a result of the motion is gradually removed, and which barking drum (1) further includes a number of elongated bark slots (6) extending through its inner drum shell surface (4), at least some of the removed barks being adapted to discharge from the drum therethrough, c h a r a c t e r i z e d in that the inner drum shell surface (4) of the barking drum (1) is coated intermittently with an annular section at a time, that a new inner surface for the barking drum (1) is compiled from two or more annular sections, and that each annular section is produced by welding a number of form- moulded plates (8, 9, 10, 11) of substantially equal mutual size and shape securely to the inner drum shell surface (4) of the barking drum (1) and to each other.
2. A method as set forth in claim 1, c h a r a c t e r i z e d in that the annular section is made of a number of plates (8, 9, 10), which have been formed with a ridge (15) serving as a log lifter.
3. A method as set forth in claim 2, c h a r a c t e r i z e d in that the annular section is made of a number of plates (9), which are formed with a ridge (15) serving as a log lifter and which plates (9) are further provided with one or more bark slots (16).
4. A method as set forth in claim 2 or 3, c h a r a c t e r i z e d in that the ridge (15) serving as a log lifter is fitted on top of a log lifter (5) already included in the barking drum (1) to be renovated.
5. A method as set forth in claim 1, c h a r a c t e r i z e d in that the annular section is made of a number of plates (11), on top of which is welded a ridge (17) serving as a log lifter.
6. A method as set forth in claim 5, c h a r a c t e r i z e d in that the annular section is made of a number of plates (11), on top of which is welded a ridge (17) serv- ing as a log lifter and which plates are further provided with one or more bark slots (16).
7. A method as set forth in any of claims 1-6, c h a r a c t e r i z e d in that the bark slots (16) included in a plate (9, 11) provided with one or more bark slots are set in alignment with the bark slots (6) already included in the barking drum (1) to be renovated.
8. A method as set forth in claim 7, c h a r a c t e r i - z e d in that the plate (9, 11) provided with one or more bark slots is welded securely to the inner drum shell surface (4) of the barking drum (1) to be renovated in alignment (18) with the bark slots (6, 16).
9. A method as set forth in claim 1, c h a r a c t e r i z e d in that the annular section is made of a number of plates (10) bent into the shape of a log lifter.
10. A method as set forth in any of claims 1-9, c h a r a c t e r i z e d in that the attachment of the plates (8, 9, 11) is fixed with plug welds.
PCT/FI1997/000379 1996-06-28 1997-06-16 Method for renovating a barking drum WO1998000271A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU31772/97A AU3177297A (en) 1996-06-28 1997-06-16 Method for renovating a barking drum
SE9804331A SE515891C2 (en) 1996-06-28 1998-12-15 Renovation of bark drum
NO985952A NO985952L (en) 1996-06-28 1998-12-18 Method of renovating a barking drum

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI962674 1996-06-28
FI962674A FI100868B (en) 1996-06-28 1996-06-28 Method for repairing a peeling drum

Publications (1)

Publication Number Publication Date
WO1998000271A1 true WO1998000271A1 (en) 1998-01-08

Family

ID=8546306

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000379 WO1998000271A1 (en) 1996-06-28 1997-06-16 Method for renovating a barking drum

Country Status (5)

Country Link
AU (1) AU3177297A (en)
FI (1) FI100868B (en)
NO (1) NO985952L (en)
SE (1) SE515891C2 (en)
WO (1) WO1998000271A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE86408C1 (en) *
SE98052C1 (en) *
US1986530A (en) * 1932-09-10 1935-01-01 Alexander M Read Grinding mill
US4141511A (en) * 1977-03-03 1979-02-27 Trelleborg Rubber Company, Inc. Mill lining elements
US4293014A (en) * 1978-02-11 1981-10-06 Skega Aktiebolag Barking drum

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE86408C1 (en) *
SE98052C1 (en) *
US1986530A (en) * 1932-09-10 1935-01-01 Alexander M Read Grinding mill
US4141511A (en) * 1977-03-03 1979-02-27 Trelleborg Rubber Company, Inc. Mill lining elements
US4293014A (en) * 1978-02-11 1981-10-06 Skega Aktiebolag Barking drum

Also Published As

Publication number Publication date
FI100868B (en) 1998-03-13
NO985952D0 (en) 1998-12-18
SE515891C2 (en) 2001-10-22
SE9804331D0 (en) 1998-12-15
SE9804331L (en) 1998-12-15
NO985952L (en) 1998-12-28
AU3177297A (en) 1998-01-21
FI962674A0 (en) 1996-06-28
FI962674A (en) 1997-12-29

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