EP0983796A1 - Holzhackmaschine - Google Patents

Holzhackmaschine Download PDF

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Publication number
EP0983796A1
EP0983796A1 EP98870187A EP98870187A EP0983796A1 EP 0983796 A1 EP0983796 A1 EP 0983796A1 EP 98870187 A EP98870187 A EP 98870187A EP 98870187 A EP98870187 A EP 98870187A EP 0983796 A1 EP0983796 A1 EP 0983796A1
Authority
EP
European Patent Office
Prior art keywords
wood
cylinder
wood shredder
shredder
knife
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.)
Withdrawn
Application number
EP98870187A
Other languages
English (en)
French (fr)
Inventor
Jozef Beauprez
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP98870187A priority Critical patent/EP0983796A1/de
Publication of EP0983796A1 publication Critical patent/EP0983796A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/144—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with axially elongated knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C18/186—Axially elongated knives
    • 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
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/002—Transporting devices for wood or chips
    • 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
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/005—Tools therefor

Definitions

  • the present invention is situated in the field of wood shredders, that are usually used to transform pruned branches, sticks and other waste wood into wood chips or splinters.
  • Wood shredders are being used in gardens or for park maintenance by private persons or public services.
  • Wood shredders have two major purposes : waste wood such as pruned wood, dead wood, and sometimes even fallen trees can be transformed into a much more manageable bulk product (wood chips or splinters), which is an ecologically sound way of getting rid of waste wood, certainly when compared to the formerly used methods such as burning.
  • a second application of wood shredders is to provide wood chips and splinters which are excellent ground cover for e.g. flowerbeds.
  • Small models are usually very limited in capacity (allowing the treatment of wood sticks going up to a few cm in wood diameter) and can be described as a knife rotating around its centre, the wood being fed from one side perpendicular to the orientation of the knife.
  • the wood chips obtained are evacuated at the other side of the rotating knife by making advantage of the centrifugal force the chips are subjected to when being cut from the branch.
  • These domestic models have a low capacity and usually a very low throughput, due to their design, and cannot be used for professional purposes.
  • Bigger shredders having a professional use are characterised by a higher throughput. They usually have, apart from the higher performance cutting system, a feeding system that reduces the amount of jams. However, these systems are not easy to operate when jams have occurred.
  • the construction of the wood shredder's feeding channel is conical.
  • such a construction is vulnerable to jams when too much branches (or, e.g. heavily branched trees) are fed at a high rate.
  • a cylindrical feeding channel is not suitable for a high feed rate.
  • the primary aim of the invention is to provide a new wood shredder system which does not present the drawbacks of the state of the art, and which has improved throughput, capacity and maintenance, especially a wood shredder which would jam less often and, when jams occur, would be more swiftly unjammed.
  • a further aim is to provide a wood shredder that saves time by providing high throughput and low jamming.
  • the present invention concerns a wood shredder for reducing wood branches to splinters and/or chips, which comprises a cylinder, rotating around its main axis, on which at least one flat knife is mounted, the plane of said knife being perpendicular to the radius of said cylinder, and a counterknife that is mounted parallel to the axis of said cylinder.
  • the cylinder rotates in the direction the cutting edge of the knife is pointing to.
  • the wood shredder of the present invention can comprise two or more knifes.
  • said knifes have two cutting sides, so that when one side is blunted, the knife can be mounted backwards and the other, sharp side of the knife can be used without the need for sharpening or replacing the knife.
  • Said counterknife is preferably in the form of a beam, of which all four sides can be used as knife side before the counterknife has to be replaced.
  • the wood shredder of the invention can be further characterised in that the cylinder rotates at a speed of about 2000 revolutions per minute. This speed provides an optimal balance between throughput and ease of cutting.
  • the wood shredder preferably further comprises a feeding channel for safety reasons.
  • a feeding channel for safety reasons.
  • said feeding channel is about 1 meter long, not permitting arms or legs to reach the knife when drawn in accidentally.
  • Said feeding channel preferably consists of an essential straight portion and a truncated essential pyramidal portion. The straight portion is advantageously more than 2 times longer than the pyramidal portion.
  • the straight portion is a beam and the pyramidal portion has a rectangular base.
  • the straight portion has a cylindrical form and the pyramidal portion is a truncated cone. This form of feeding channel permits a minimisation of jams.
  • the feeding channel being cylindrical with a short truncated conical portion at the end, shows a jam-reducing behaviour.
  • the cylindrical knife construction eliminates the need for a feeding system. If a jam occurs, it can be easily undone by pulling up some wood, which saves time compared to the state of the art.
  • the wood shredder can further comprise a transmission that is connected to the cylinder.
  • it further comprises an engine able to rotate the cylinder and which is connected to said transmission.
  • it further comprises means to connect the transmission to a driving means, said driving means being preferably a cardan shaft of a tractor or gardening machine.
  • Example 1 Description of the cylinder according to the invention
  • Figure 1 describes a cylinder 2 according to the invention.
  • the cylinder according to the present invention rotates around its axis (A) at a speed of about 2000 revolutions per minute.
  • 2 knives (3) are mounted using bolts 17.
  • the plane of the knife ( ⁇ ) is perpendicular to the radius (R) of the cylinder 2.
  • the counterknife 4 is mounted parallel to the axis A.
  • the wood is shredded at the cutting side 20.
  • the cut-away 18 that is provided in the cylinder before the knife (in view of the rotation direction ⁇ of the cylinder 2) transports the obtained wood chips from the cutting side 20 to the evacuation side 21, where the wood chips leave the cut-away due to centrifugal force.
  • the cylinder as described is used in the preferred embodiments of examples 2 and 3.
  • the shredder 1 comprises a cylinder 2 with two or more knives 3 thereon.
  • the wood is fed through a feeding channel 6, dimensioned so that there is no danger for the limbs of the operator.
  • said feeding channel 6 is about 1 meter long.
  • the opening of the feeding channel 12 is dimensioned so that trees of certain dimensions that will not jam the machine can be inserted. Preferred opening dimensions are about 40x30 cm.
  • the cylinder present a diameter about 23 cm and a length about 30 cm.
  • the knives are also 30 cm long and about 4 cm broad.
  • the feeding channel comprises a portion in the form of a beam 13 and a truncated pyramidal portion 14.
  • the pyramidal portion ends on a rectangular opening 16 (with dimensions 30x15 cm), through which the wood can reach the rotating cylinder 2.
  • a counterknife 4 is mounted parallel to the cylinder axis on the cylinder chamber 15.
  • the minimal distance between the knives 3 mounted on the cylinder 2 and the counterknife 4 determines the thickness of the wood chips, and the throughput rate. Preferably, this distance is about 5 mm.
  • the obtained wood ships are evacuated through a hose or dirigible evacuation channel 7 to a container or just on a pile. There is no need for an additional powered evacuation system since the velocity at which the chips are ejected from the cylinder 2 is enough to blow them through the evacuation channel 7.
  • the wood shredder is preferably powered by an atmospheric engine capable of providing enough torque to spin the cylinder 2 at a speed of about 2000 revolutions per minute. If necessary, a transmission device is placed between the engine and the cylinder to adjust the amount of revolutions per minute.
  • the transmission can be made of the straight type or with at straight angles.
  • the stand-alone wood shredder can also be powered by an electric motor.
  • This machine can cope with wood until a diameter of about 8 cm.
  • the stand-alone wood shredder as described in example 2 can easily be adapted for an existing driving means, such as a cardan axle of a tractor or gardening machine such as a Walker front lawnmower.
  • the wood shredder can be driven by the cardan axle.
  • This cardan axle rotates at 3000 revolutions per minute.
  • the assembly as in fig 2 can be attached to the Walker by inserting the pins emerging from the front of the Walker into the cylinders 8 and secured with locking pins 9.
  • Wheel assemblies 11 are placed on either side of the cylinder, allowing to drive the assembled machine (when the wood shredder is attached). Foot supports 10 provide more comfort when driving around.
  • the evacuation of the wood chips can be obtained by using the evacuation system of the Walker. Through evacuation channel 7, connected to the evacuation system of the Walker, the wood chips are transported via the internal turbine of the Walker to the container. If desired, the container can be left open, resulting in the spreading of the wood chips behind the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Crushing And Pulverization Processes (AREA)
EP98870187A 1998-09-02 1998-09-02 Holzhackmaschine Withdrawn EP0983796A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98870187A EP0983796A1 (de) 1998-09-02 1998-09-02 Holzhackmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98870187A EP0983796A1 (de) 1998-09-02 1998-09-02 Holzhackmaschine

Publications (1)

Publication Number Publication Date
EP0983796A1 true EP0983796A1 (de) 2000-03-08

Family

ID=8237088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98870187A Withdrawn EP0983796A1 (de) 1998-09-02 1998-09-02 Holzhackmaschine

Country Status (1)

Country Link
EP (1) EP0983796A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009040490A1 (en) * 2007-09-24 2009-04-02 Palm-Organics Global Ltd Method and apparatus for reducing palm stems to biomass
DE102015011437A1 (de) 2015-09-01 2017-03-02 Julius Tielbürger GmbH & Co. KG Gartenhäcksler mit einem Fahrgestell

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703956A (en) * 1952-01-28 1954-02-10 Asplundh Tree Expert Co Improvements in or relating to chipping equipment for reducing branches and the like
US3870239A (en) * 1972-02-03 1975-03-11 Red Cross Manufacturing Corp Detachable loading device for garden shredder
US3944147A (en) * 1974-12-06 1976-03-16 Asplundh Tree Expert Co. Brush chipper
EP0134378A1 (de) * 1983-09-09 1985-03-20 Faser-Plast AG Zerkleinerungsmaschine
NL8902709A (nl) * 1989-11-02 1991-06-03 Mark Van Der Galien Inrichting voor het versnipperen van snoeihout.
US5076503A (en) * 1989-07-12 1991-12-31 Cook Robert L Size reduction processing apparatus for solid material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703956A (en) * 1952-01-28 1954-02-10 Asplundh Tree Expert Co Improvements in or relating to chipping equipment for reducing branches and the like
US3870239A (en) * 1972-02-03 1975-03-11 Red Cross Manufacturing Corp Detachable loading device for garden shredder
US3944147A (en) * 1974-12-06 1976-03-16 Asplundh Tree Expert Co. Brush chipper
EP0134378A1 (de) * 1983-09-09 1985-03-20 Faser-Plast AG Zerkleinerungsmaschine
US5076503A (en) * 1989-07-12 1991-12-31 Cook Robert L Size reduction processing apparatus for solid material
NL8902709A (nl) * 1989-11-02 1991-06-03 Mark Van Der Galien Inrichting voor het versnipperen van snoeihout.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009040490A1 (en) * 2007-09-24 2009-04-02 Palm-Organics Global Ltd Method and apparatus for reducing palm stems to biomass
DE102015011437A1 (de) 2015-09-01 2017-03-02 Julius Tielbürger GmbH & Co. KG Gartenhäcksler mit einem Fahrgestell
WO2017036596A1 (de) 2015-09-01 2017-03-09 Julius Tielbürger GmbH & Co. KG Gartenhäcksler mit einem fahrgestell

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