EP1362679A2 - Hackmaschine - Google Patents
Hackmaschine Download PDFInfo
- Publication number
- EP1362679A2 EP1362679A2 EP03010331A EP03010331A EP1362679A2 EP 1362679 A2 EP1362679 A2 EP 1362679A2 EP 03010331 A EP03010331 A EP 03010331A EP 03010331 A EP03010331 A EP 03010331A EP 1362679 A2 EP1362679 A2 EP 1362679A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- machine according
- counter
- knife
- chopping machine
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
- B27B33/20—Edge trimming saw blades or tools combined with means to disintegrate waste
-
- 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
-
- 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
-
- 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
- B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
Definitions
- Such a chopping machine is known for example from DE 41 26 910 C1.
- the knife edges approximate one circular cylindrical surface of the rotor.
- the knife edges are strong against the axially parallel surface lines are inclined and the levels of the knife inserts are tilted relative to the rotor axis.
- a chipper with a conical rotor and at an angle to its rotor axis extending feed direction is known from US 3,375,859.
- the US 3 319 673 shows a chopping machine on a circular cylindrical Rotor wound knife edges.
- the rotor can also be divided into several same sub-rotors can be divided.
- CH 379 107 Arrangement are a plurality of disks with minor axial cutting edges Extension assembled to form an axially wider rotor package.
- the present invention has for its object an advantageous one Specify chipper.
- a chopping machine according to the invention is essential runs more smoothly and requires less drive power than a conventional one Chipper of the type described in the introduction.
- the rotor jacket from the cutting edges of the rotating around the rotor axis Knife arrangement described surface is preferably mirror-symmetrical with respect to one in the axial direction in the middle between the two end positions lying central plane.
- the radius of the rotor shell is preferably reduced from the maximum radius monotonously, in particular continuously to End radii.
- the rotor shell can in particular be essentially biconical To have shape.
- the counter knife arrangement follows with its counter edges with a small distance between the contour of the rotor shell.
- the counter knife arrangement on which the wood chips are supported, forms advantageously with a plurality of counter knife bars, an upward widening Recording in which the typically elongated wood chips under Gravity is self-centering.
- the recording angle is later above perpendicular to the direction of advance of the wood chips advantageously between 135 ° and 170 °. Due to the large mounting angle, wood chips are also included large diameter the vertical distance to the counter knives in the middle, where the counter knives converge, advantageously low.
- the counter knife arrangement forms a counter to the direction of rotation of the rotor expanding receptacle for the Wood chips, so that this during the chopping process under the influence of the Knife arrangement forces exerted towards the center of the recording and thus centered by the chopping process itself in the counter knife arrangement and is stabilized.
- the measure of towards the axial end positions reducing radii of the rotor shell on the one hand and against the other Direction of rotation of the rotor expanding receptacle can be independent of each other or be implemented in combination.
- the individual counter edges of the counter knife bars are preferably straight.
- the counter knife arrangement can have exactly two counter knife bars exhibit. These are then preferably against the tangential direction of the rotor shell in the counter knife arrangement by a deviating from 90 ° Edge inclination angle is inclined.
- the cutting edges of the knife arrangement are preferred just.
- the cutting edges can also advantageously be against the tangential direction of the rotor sheath at the respective knife edge cutting edge inclination angles deviating from 90 °.
- the alignment the knife edge with respect to the tangential direction is advantageous different from the orientation of the cutting edges with respect to the tangential direction, so that cutting edges and counter edges including a Be moved past each other.
- the inclination of cutting edges and associated counter edges can be mirror-symmetrical with respect a plane containing the rotor axis.
- the shear effect is special also advantageous for hard inclusions in wood chips, for example pieces of metal (Nails) in demolition wood, showing that by training such a scissor angle the cutting edges of the knives less be claimed.
- the knife arrangement preferably contains several individual knives, which axially successive, possibly overlapping sections of the Describe the rotor shell and / or which are angularly offset about the rotor axis are arranged, preferably with a uniform angle approach.
- the knives are connected to the driven rotor shaft via a carrier arrangement connected, which is advantageously mounted axially on both sides of the rotor shell is.
- the connection to the rotor shaft is preferably made via carrier disks, on which base plates fixed and arranged in a defined orientation are, on which in turn knife plates are attached.
- the knife plates are advantageously removably attached to the base plates, the exact alignment with the counter edges of the counter strips in the counter knife arrangement to enable and in particular the knife plates To be able to reuse wear due to regrinding.
- a guide between the knife plates and base plates or those involved Elements may be provided.
- the adjustment is preferably done in a direction perpendicular to a straight cutting edge in the knife plate plane.
- the wood chips are typically fed into the feed device horizontal, but can also be inclined so that the wood chips are under Gravity moved in the direction of the rotor or rising upwards is promoted.
- the rotor casing preferably runs perpendicular to the rotor axis and / or in the feed device is oriented towards the central plane Centering device provided.
- the centering device advantageously has Elements on which a downwardly narrowed channel with bilateral form inclined contact surfaces, these contact surfaces advantageously step over to the counter strips of the counter knife arrangement.
- a counter knife arrangement widening upwards, counter to the direction of rotation of the rotor can also be advantageous in conjunction with a straight line Knife edge of a cylindrical tube jacket.
- the feed direction ZR is typically horizontal for controlled, uniform Feed, but can also decrease or increase towards the rotor.
- the rotor of the chopping machine is indicated by a knife arrangement several knives, the cutting edges of which in the sketched case in four by 90 ° offset the rotor axis RA and parallel to this or to the plane of the drawing the vertical cutting planes S1, S2, S3, S4 and describe a surface that is rotationally symmetrical to the rotor axis RA during rotation, which is referred to as the rotor jacket MA.
- the knives are the one Not shown for clarity. It is advantageously at least two knives are provided in the knife arrangement. The maximum number the knife is u. a. by the width of the machine and the length of the knives certainly. Depending on the number of knives, their angular offset and / or axial offset vary.
- the mechanical connection of the knife assembly with the drive shaft RW is typically given by washers which carrier plates for the knives are welded on.
- a counter knife arrangement GM is fixed to the machine which counter edges GK are formed, which are at a small distance SP from typically less than 3 mm, in particular less than 1 mm of the contour of the rotor shell MA follow, as illustrated in FIG. 2.
- Fig. 2 forms one simplified view in the direction of arrow A in Fig. 1, which is approximately tangential runs to the rotor jacket in the counter knife arrangement GM.
- the rotor jacket extends in the axial direction AR of the rotor axis RA between two end positions marked with axial positions AE (L) and AE (R).
- the rotor jacket MA instructs in its course in the axial direction an axial position AO lying between the two end positions a maximum radius RM that is larger than the rotor jacket radii RE at the end positions.
- the rotor jacket is preferably mirror-symmetrical to one middle plane lying at AO and can in particular at least approximate have a biconical shape.
- the knives of the knife arrangement are typically not only angularly offset, but also offset in the axial direction and individually cover only a part the axial extension LR of the rotor shell, so that in axial Four assigned knife positions corresponding to four assigned Sheath sections M2 (L), M1 (L), M1 (R) and M2 (R), which correspond to the Section boundaries AZ (L) AO, AZ (R) can also overlap slightly.
- the rotor shell has the radius RZ.
- the axial Lengths of the sections can be essentially the same as outlined so u. The same individual knives may be used in all sections can.
- the axial lengths of the sections also vary and in particular be lower for the central sections M1 than for the outer sections M2.
- the end radii RE are advantageously at least 30%, in particular at least 45% of the maximum radius RM.
- the upper limit for the end radii RE is advantageously 90%, in particular 80% of the maximum radius.
- the opening angle WP of the biconical rotor shell MA sketched in FIG. 2 is advantageously at least 120 °, preferably at least 130 °, in particular at least 140 °.
- An upper limit for the opening angle WP is advantageously a maximum of 170 °, preferably a maximum of 160 °, in particular maximum 150 °.
- the counter knife assembly contains two counter strips as counter knife GM, which in particular also as square strips can be carried out, but their cross-sectional shape is not necessary is rectangular.
- the counter edges GK are formed on the counter knives GM, which, as sketched in FIG. 2 in the tangential direction of view, advantageously follow the contour of the rotor shell with a small gap SP.
- the opposite edges are preferably straight.
- a counter knife is provided for the axial position of the maximum radius.
- the Counter knives are schematic with counter edges fully reaching towards each other outlined. In real construction, a small one can advantageously Leave a gap of a few mm between the two opposite edges.
- the cutting planes are also schematically approximated in FIG. 3 S1, S2 and S4 according to the notation in Fig. 1.
- the cutting plane lying behind S3 is not entered.
- the cutting lines of the cutting planes S2 and S4 with the rotor shell give at least approximately the contour of the rotor shell again.
- the counter knife arrangement is corresponding for the inclination of the counter edges GK against the same axial plane, which is considered perpendicular to A first opposite edge projection angle is assumed standing plane WEK shown.
- FIG. 4 is a view according to arrow C from FIG. 1 of the counter knife arrangement and a supplied tree trunk against the feed direction ZR outlined.
- the feature illustrates that both the centering plate ZB as well as the counter knife arrangement with the counter knives GM and the counter edges GK formed on these Upward extension to the wood chips with a vertically measured image Form the recording angle WAU, so that the wood chips both under the own weight as well as possibly under the influence of the knife arrangement is centered in the recording.
- the recording angle is preferably in one Range between 135 ° and 170 °.
- the support surface of the centering device which, for. B. by a molded Centering plate ZB can be formed, for. B. from an initially at least approximately straight horizontal course over an angled course pass over and the counter knife strips forming the counter knife GM advantageously close continuously to the course of the centering plate on.
- the knife arrangement contains several knives ME1, ME2, ME3, ME4, which around the rotor axis by 90 ° and in the axial Direction by the same axial spacing approximately corresponding to the knife width are offset and a mirror-symmetrical with respect to a central plane MB, generate essentially biconical rotor jacket MA, which by the cutting edges of the knives ME1 and ME3 in the middle plane two inner Mantle sections M1 and then these through the cutting edges of the Knife ME2 or ME4 comprises two outer sections M2.
- the Cutting edges of the knives are straight and are each in the axis plane ER, d. H. in cutting planes that contain the rotor axis.
- WES in a projection according to FIG. 3 is zero, as is evident from the view corresponding to FIG. 3 in FIG. 6 for the knives ME1 and ME3 shows.
- the course of the opposite edges GK is the Counter knife arrangement entered, which inclined to the knife edges run.
- a knife is enlarged in FIG. 11 in the direction of view parallel to the rotor axis corresponding to the orientation of ME1 of the example according to FIGS. 5 and 6 shown with cutting edge SK running in cutting plane S1, for whose end points delimit the casing section M1 on the rotor casing Circular paths with radii RM and RZ are shown.
- the knife is made of a flat plate MP of constant thickness with a ground cutting edge manufactured.
- the occurrence of a non-zero angle of attack is correlated with the occurrence 3 and synonymous with one of 90 ° deviating alignment of the cutting edge or counter edge against the respective Tangential.
- the knives are advantageously on base plates GP attached, which in turn connected to carrier disks TS, in particular are welded.
- the attachment of the knives on the base plates is advantageously detachable to replace knives after wear or after regrinding the knife edges.
- To be able to adjust SP, the knives are adjustable on the base plates.
- the knife edges are preferably straight and the adjustment direction runs perpendicular to the knife edge.
- Knife plate MP slots LL or slots that are perpendicular to the straight SK cutting edge run.
- Fig. 10 corresponds to the viewing direction in the direction of arrow F, FIG. 11 in the direction of arrow G of FIG. 9.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Food Science & Technology (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
Description
- Fig. 1
- eine Seitenansicht einer erfindungsgemäßen Hackmaschine,
- Fig. 2
- eine Ansicht von Rotormantel und Gegenmesseranordnung mit Blickrichtung A nach Fig. 1,
- Fig. 3
- eine Ansicht von Rotormantel und Gegenmesseranordnung mit Blickrichtung B nach Fig. 1,
- Fig. 4
- eine Ansicht von Gegenmesseranordnung und Zuführeinrichtung mit Blickrichtung C entgegen der Zuführeinrichtung,
- Fig. 5
- eine erste Messeranordnung in Richtung der Rotorachse,
- Fig. 6
- eine Ansicht zu Fig. 5 mit Blickrichtung radial auf die Rotorachse,
- Fig. 7
- eine Messeranordnung mit gegen die Tangentialrichtung geneigten Schneidkanten,
- Fig. 8
- eine Radialansicht zu Fig. 7,
- Fig. 9
- eine Draufsicht auf eine Messerplatte zu Fig. 8,
- Fig. 10
- einen Schnitt durch eine Messerbefestigung nach Fig. 9,
- Fig. 11
- eine Seitenansicht einer Messerposition nach Fig. 5,
- Fig. 12
- eine weitere Kontur eines Rotormantels.
Claims (18)
- Hackmaschine, insbesondere zum Zerhacken von Hackgut, insbesondere von länglichen Holzstücken wie Stammabschnitten, Bauholz etc., mit einem Hackrotor und einer Zuführeinrichtung, wobei der Hackrotor eine um eine Rotorachse (RA) rotierende Messeranordnung aufweist, deren Messer-Schneidkanten (SK) einen zur Rotorachse rotationssymmetrischen Rotormantel (MA) beschreiben, welcher sich in achsialer Richtung zwischen zwei Endlagen (AE) erstreckt, und wobei an der Zuführeinrichtung eine Gegenkanten (GK) vorhanden ist, deren Gegenmesserschneiden in geringem Abstand (SP) von dem Rotormantel verlaufen, dadurch gekennzeichnet, dass der Rotormantel einen Maximalradius (RM) an einer von beiden Endlagen beabstandeten achsialen Position (AO) aufweist und die Endradien (RE) des Rotormantels in beiden achsialen Endlagen (AE) geringer sind als dieser Maximalradius und/oder dass die Gegenmesseranordnung mit mehreren Gegenmesserleisten (GM) eine entlang des Rotormantels sich entgegen der Drehrichtung des Rotors erweiternde Aufnahme für das Hackgut bildet
- Hackmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Maximalradius in achsialer Richtung (AR) zumindest annähernd in der Mitte zwischen den beiden Endlagen (AE) liegt.
- Hackmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Rotormantel spiegelsymmetrisch zu einer Mittelebene (MB) zwischen den beiden Endlagen verläuft.
- Hackmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Radius des Rotormantels vom Maximalradius zu den Endradien monoton abnimmt.
- Hackmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Endradien (RE) mindestens 30 %, insbesondere mindestens 45 % des Maximalradius (RM) betragen.
- Hackmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Endradien (RE) höchstens 90 %, insbesondere höchstens 80 % des Maximalradius (RM) betragen.
- Hackmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass Maximalradius (RM) und achsiale Länge (LR) des Rotormantels um maximal 25 % des jeweils größeren Wertes voneinander abweichen.
- Hackmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Messeranordnung in achsialer Richtung in mehrere Abschnitte (M1, M2) mit getrennten Einzelmessern unterteilt ist.
- Hackmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Messeranordnung mehrere um die Rotorachse winkelversetzt angeordnete Messer aufweist.
- Hackmaschine nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Messeranordnung ebene Messer mit angeschliffenen Schneidkanten (SK) aufweist.
- Hackmaschine nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Messeranordnung Messer mit geraden Schneidkanten aufweist.
- Hackmaschine nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass in der Messeranordnung Messer auf einem Messerträger befestigt und senkrecht zur Schneidkante nachstellbar sind.
- Hackmaschine nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass die Zuführrichtung (ZR) in der Zuführeinrichtung senkrecht zur Achsrichtung (AR) des Rotors verläuft.
- Hackmaschine nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die Zuführeinrichtung eine Zentriereinrichtung umfasst.
- Hackmaschine nach Anspruch 14, dadurch gekennzeichnet, dass die Zentriereinrichtung eine nach unten verengte Rinne mit beidseitigen Anlageflächen für das Hackgut enthalten.
- Hackmaschine nach Anspruch 15, dadurch gekennzeichnet, dass die Anlageflächen im wesentlichen stufenlos in die Gegenmesseranordnung (GM) übergehen.
- Hackmaschine nach einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, dass die Gegenmesseranordnung Gegenmesser mit geraden Gegenkanten (GK) enthält.
- Hackmaschine nach einem der Ansprüche 1 bis 17, dadurch gekennzeichnet, dass Schneidkanten der Messeranordnung und korrespondierende Gegenkanten der Gegenmesseranordnung in unterschiedlichen Ausrichtungen gegen die Tangentialrichtung des Rotormantels verlaufen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10221308 | 2002-05-14 | ||
DE10221308A DE10221308B4 (de) | 2002-05-14 | 2002-05-14 | Hackmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1362679A2 true EP1362679A2 (de) | 2003-11-19 |
EP1362679A3 EP1362679A3 (de) | 2007-10-10 |
EP1362679B1 EP1362679B1 (de) | 2012-01-04 |
Family
ID=29265268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03010331A Expired - Lifetime EP1362679B1 (de) | 2002-05-14 | 2003-05-08 | Hackmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1362679B1 (de) |
AT (1) | ATE539865T1 (de) |
DE (1) | DE10221308B4 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107737621A (zh) * | 2017-11-30 | 2018-02-27 | 河南荣成机械工程有限公司 | 组合刀片式柔性动能粮食脱皮装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2697557A (en) | 1952-03-17 | 1954-12-21 | Murray D J Mfg Co | Wood chipper |
CH379107A (de) | 1960-08-15 | 1964-06-30 | Alba Werkzeug | Zerspanerwerkzeug |
US3319673A (en) | 1964-05-15 | 1967-05-16 | Hombak Maschinenfab Kg | Machine for producing wood chips |
US3375859A (en) | 1965-09-03 | 1968-04-02 | Salem Equipment Inc | Wood chipping apparatus |
US4776375A (en) | 1986-10-14 | 1988-10-11 | Stanley Arasmith | Winged cutting knife for producing wood chips or flakes |
DE4126910C1 (de) | 1991-08-14 | 1992-09-24 | Georg Weiss Gmbh, 8201 Schechen, De |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2873923A (en) * | 1956-07-16 | 1959-02-17 | Columbia Veneer Company | Wood rechipper |
DE1211375B (de) * | 1962-04-13 | 1966-02-24 | Ind Companie Kleinewefers Kons | Trommelzerspaner zur Herstellung von Holzspaenen |
AT385231B (de) * | 1986-01-17 | 1988-03-10 | Starchl Maximilian | Trommelhackmaschine |
-
2002
- 2002-05-14 DE DE10221308A patent/DE10221308B4/de not_active Expired - Fee Related
-
2003
- 2003-05-08 AT AT03010331T patent/ATE539865T1/de active
- 2003-05-08 EP EP03010331A patent/EP1362679B1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2697557A (en) | 1952-03-17 | 1954-12-21 | Murray D J Mfg Co | Wood chipper |
CH379107A (de) | 1960-08-15 | 1964-06-30 | Alba Werkzeug | Zerspanerwerkzeug |
US3319673A (en) | 1964-05-15 | 1967-05-16 | Hombak Maschinenfab Kg | Machine for producing wood chips |
US3375859A (en) | 1965-09-03 | 1968-04-02 | Salem Equipment Inc | Wood chipping apparatus |
US4776375A (en) | 1986-10-14 | 1988-10-11 | Stanley Arasmith | Winged cutting knife for producing wood chips or flakes |
DE4126910C1 (de) | 1991-08-14 | 1992-09-24 | Georg Weiss Gmbh, 8201 Schechen, De |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107737621A (zh) * | 2017-11-30 | 2018-02-27 | 河南荣成机械工程有限公司 | 组合刀片式柔性动能粮食脱皮装置 |
Also Published As
Publication number | Publication date |
---|---|
DE10221308B4 (de) | 2007-04-12 |
ATE539865T1 (de) | 2012-01-15 |
EP1362679B1 (de) | 2012-01-04 |
EP1362679A3 (de) | 2007-10-10 |
DE10221308A1 (de) | 2003-12-11 |
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