EP0266582A1 - Meule pour bois - Google Patents

Meule pour bois Download PDF

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Publication number
EP0266582A1
EP0266582A1 EP87114887A EP87114887A EP0266582A1 EP 0266582 A1 EP0266582 A1 EP 0266582A1 EP 87114887 A EP87114887 A EP 87114887A EP 87114887 A EP87114887 A EP 87114887A EP 0266582 A1 EP0266582 A1 EP 0266582A1
Authority
EP
European Patent Office
Prior art keywords
press
wood
main
ram
grinder according
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.)
Granted
Application number
EP87114887A
Other languages
German (de)
English (en)
Other versions
EP0266582B1 (fr
Inventor
Hans-Otto Henrich
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT87114887T priority Critical patent/ATE56764T1/de
Publication of EP0266582A1 publication Critical patent/EP0266582A1/fr
Application granted granted Critical
Publication of EP0266582B1 publication Critical patent/EP0266582B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/24—Disintegrating in mills in magazine-type machines of the pocket type

Definitions

  • the invention relates to a wood grinder according to the preamble of claim 1.
  • a wood grinder is known from German patent specification 297 810.
  • press rams which are each guided in press chambers, which also serve as loading chambers for the wood beating around them to feed the common grinder magazine.
  • press rams are alternately pressurized, so that due to the pressure propagation in the wood pile forming a pile in the press magazine, the pressing pressure propagates from wood beating to wood beating up to the grindstone surface.
  • the ram for the loading process is withdrawn into the upper pressure position, and after the other ram has dropped during its working stroke, the working stroke of this ram, which is associated with the just loaded partial magazine, is initiated. It is advisable to load each partial magazine of the individual rams parallel to the axial direction of the grinder stone, since otherwise it would not be possible to load the partial magazines properly.
  • the distance of the lower edge of the middle wall of the press magazines, which is close to the grinder stone, which is arranged between them, ie also the lower stroke end of the press rams, is of course to be chosen such that the grinding pressure exerted by a press ram also corresponds to the angle of repose for the pressure profile can spread over the entire width of the press magazine in the area of the grindstone surface.
  • a disadvantage of this arrangement is that both the sub-magazines assigned to the individual rams must each be loaded with the wood beating themselves, so that a separate loading device is necessary in each case. Furthermore, in order to ensure the full pressing pressure and its uniformity with each working thrust, end plates must be provided in the area of the part magazine assigned to each individual pressing ram in the area near the grindstone, although these are not mentioned in the patent specification.
  • the object of the invention is now to provide a wood grinder in which only a single loading device for the press magazines is necessary.
  • Fig. 1 is in the middle of the magazine arrangement and the grindstone 1, the main press chamber 2, in which the main press ram 3 is arranged, which can be moved via the push rod 8.
  • the drive of the ram is omitted. They are generally designed as known hydraulic servomotors.
  • Laterally next to the main press chamber 2 are the secondary press chambers 4 and 4 ⁇ with their respective associated side ram 5 and 5 ⁇ , which are similarly driven by push rods 8 ⁇ .
  • the inner chamber walls 11, 12, which are parts of the main press chamber 2 simultaneously form the inner walls of the secondary press chambers 4 and 4 ⁇ .
  • the length - that is measured in the axial, ie stroke direction - the secondary press ram is preferably approximately equal to its effective press stroke, generally its stroke at all.
  • the location of the secondary ram 5 and 5 ⁇ is the starting position before the press stroke, at least as far as it concerns the beginning of the pressing of the wood by this ram.
  • the main press ram 3 is withdrawn without the pressure in the drive from the wood beating changes.
  • an end plate 7 is preferably pushed under the main press die 3 before it is retracted, so that the wood beating is prevented from escaping upwards.
  • the lower surface that is to say the bottom surface 6 or 17 of the secondary press rams, is inclined, essentially parallel to the tangent to the grindstone surface in the area where the projection in the direction of the push rods of the secondary press rams falls on the grindstone surface.
  • This inclination can also be chosen somewhat differently, since it serves to generate the greatest possible force component in the direction of the grinder stone axis or the uppermost point of the grinder stone surface. This is to ensure that the pressure across the entire grinding zone affects the pile of wood beating as evenly as possible.
  • the end plate should be pushed in under the working pressure of the main press die 3 as far as possible, its edge in the closing pressure is sharpened, preferably with a long inclined surface, which is provided with file-like or rasp-like teeth, around the surface of the wooden stick over which the end plate slides to mill off and thus reduce the resistance for pushing in the end plate.
  • the chips and the escaping wood moisture on the milling surfaces lead to reduced frictional resistance.
  • the contact pressure of the press rams could also be temporarily removed or reduced.
  • FIG. 3 the press grinder is shown in cross section in the area of the main press die 3 seen from the side.
  • a wooden feed floor 21 is provided, which belongs to a wooden feed chamber which is open at the top, on which the wooden bumps are stored with their longitudinal extension parallel to the axis of the grinder stone 1 in order to be moved into the main press chamber 2 by means of a press ram 22 - actuated by a piston rod 23 . After this process, this is shut off by the lateral slide 25, which must also be sealed pressure-tight in the event that an excess pressure is to be maintained in the grinder housing.
  • Fig. 4 a variant is shown in which there is only a secondary press chamber 4 ⁇ and a secondary press ram 5 ⁇ .
  • the bottom surface 17 ⁇ of the secondary press ram 5 ⁇ is rounded on its side facing the main press chamber 2 with a large radius, which is in the range of 4/5 the width of the secondary press chamber 4 ⁇ - measured in the circumferential direction of the grinder stone - or is slightly larger. This ensures that when the secondary press ram 5 ⁇ is raised, the wood pushed in by the main press ram 3 or 3fine can be better distributed in the wide magazine and there is no sudden, lateral evasion of individual wood prods. So the wood beats gradually slide to the side of the declining secondary die.
  • the embodiment according to FIG. 4 seems to offer advantages over the one according to FIG. 1 in this respect.
  • the drive mechanism for the secondary press ram is also lighter here, since only a single secondary ram has to be driven.
  • the secondary press ram can be designed as a laterally open hollow box construction. It can be stiffened inside the box by means of ribs 19 and 20.
  • the length of the secondary press punches 5, 5 ⁇ , 5 ⁇ should preferably be at least equal to half the total stroke of the same, but at least equal to half the effective working stroke.
  • the length of the secondary press ram is preferably at least 4/5 of the effective working stroke of the same.
  • the length of the secondary press rams will also be at least 80% of the total stroke of the same, in order to avoid excessive switching frequency. For reasons of material savings, it is better to choose the hollow construction according to FIG. 1 or the box construction according to FIG. 4 of the secondary press rams.
  • Fig. 1 is indicated by the dash-dotted lines yet another embodiment of the wooden shaft, in which the side walls have an inclination between 5 and 10 ° to each other, by the narrowing of the shaft a more uniform and stronger pressure of the wooden billets on the grinder stone by Ensure ram.
  • the wooden shaft would of course have to be made relatively long, since the side shaft walls must be parallel in the stroke area of the secondary punches 5 and 5 ⁇ .
  • the wide part of the wooden shaft could then be made relatively wide in order to obtain the same length of the grinding zone in its narrow part adjacent to the grinding stone surface as would be present without the inclined shaft walls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Paper (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP87114887A 1986-10-24 1987-10-13 Meule pour bois Expired - Lifetime EP0266582B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114887T ATE56764T1 (de) 1986-10-24 1987-10-13 Holzschleifer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3636226 1986-10-24
DE19863636226 DE3636226A1 (de) 1986-10-24 1986-10-24 Holzschleifer

Publications (2)

Publication Number Publication Date
EP0266582A1 true EP0266582A1 (fr) 1988-05-11
EP0266582B1 EP0266582B1 (fr) 1990-09-19

Family

ID=6312401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114887A Expired - Lifetime EP0266582B1 (fr) 1986-10-24 1987-10-13 Meule pour bois

Country Status (7)

Country Link
US (1) US4840317A (fr)
EP (1) EP0266582B1 (fr)
AT (1) ATE56764T1 (fr)
DE (2) DE3636226A1 (fr)
ES (1) ES2017487B3 (fr)
FI (1) FI83792C (fr)
NO (1) NO874424L (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027267A1 (fr) * 1996-12-16 1998-06-25 Valmet Corporation Dispositif pour amener le bois a un defibreur a meule
WO1998027266A1 (fr) * 1996-12-16 1998-06-25 Valmet Corporation Dispositif de meulage en continu dans un defibreur a meule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT410762B (de) * 2001-01-15 2003-07-25 Bacher Helmut Vorrichtung zur zerkleinerung von abfallgut, insbesondere kunststoffabfällen, und verfahren zu ihrem betrieb

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE297810C (fr) *
US1359016A (en) * 1919-11-15 1920-11-16 James H Baker Pulp-wood grinder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE421188C (de) * 1924-05-09 1925-11-07 Amme Fa Holzschleifer mit gruppenweise vereinigten Presskaesten
DE548889C (de) * 1928-04-01 1932-04-21 J M Voith Fa Holzschleifer mit Vorrichtung zum Anpressen des Holzes in breiten Presskaesten
DE814096C (de) * 1948-10-02 1951-09-20 Voith Gmbh J M Verfahren und Vorrichtung zum Betrieb von Holzschleifern
FI69653C (fi) * 1984-01-09 1986-03-10 Tampella Oy Ab Foerfarande och matningsanordning foer inmatning av en vedsatsi en tryckslipmaskin

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE297810C (fr) *
US1359016A (en) * 1919-11-15 1920-11-16 James H Baker Pulp-wood grinder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027267A1 (fr) * 1996-12-16 1998-06-25 Valmet Corporation Dispositif pour amener le bois a un defibreur a meule
WO1998027266A1 (fr) * 1996-12-16 1998-06-25 Valmet Corporation Dispositif de meulage en continu dans un defibreur a meule
US6095443A (en) * 1996-12-16 2000-08-01 Valmet Corporation Arrangement for feeding wood in a pulp grinder
US6109550A (en) * 1996-12-16 2000-08-29 Valmet Corporation Arrangement for providing continuous grinding in a pulp grinder

Also Published As

Publication number Publication date
DE3636226A1 (de) 1988-04-28
FI83792C (fi) 1991-08-26
DE3765083D1 (de) 1990-10-25
ATE56764T1 (de) 1990-10-15
ES2017487B3 (es) 1991-02-16
NO874424D0 (no) 1987-10-23
FI874682L (fi) 1988-04-25
NO874424L (no) 1988-04-25
US4840317A (en) 1989-06-20
FI83792B (fi) 1991-05-15
EP0266582B1 (fr) 1990-09-19
FI874682A0 (fi) 1987-10-23

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