US3734419A - Finger bars for pulpwood grinders - Google Patents
Finger bars for pulpwood grinders Download PDFInfo
- Publication number
- US3734419A US3734419A US00146351A US3734419DA US3734419A US 3734419 A US3734419 A US 3734419A US 00146351 A US00146351 A US 00146351A US 3734419D A US3734419D A US 3734419DA US 3734419 A US3734419 A US 3734419A
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- US
- United States
- Prior art keywords
- fingers
- pulpstone
- side walls
- bar
- finger
- 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
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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
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/06—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood powder or sawdust
Definitions
- ABSTRACT A pulpwood grinder including a power driven pulpstone, a pocket adapted to receive a supply of wood to be processed from which the wood is urged against the pulpstone and a finger bar positioned in close proximity to the pulpstone, the finger bar having spaced, angled fingers angled relative to the pulpstone rotational axis for directing pulp laterally toward the axial ends of the pulpstone, the spaces between the angled fingers providing restricted openings which hinder movement of slivers and other debris to facilitate further grinding action thereon and enhanced reduction to pulp.
- the instant invention relates generally to pulpwood grinders, and more particularly to unique improvements in the finger bars utilized with such grinders.
- finger bars with a series of rake-like teeth or fingers have been secured in proximity to the rotating pulpstone between adjacent pockets of a multiple-pocket grinder.
- Such finger bars as shown in U.S. Pat. No. 1,742,233, granted to F. B. Chappell and U.S. Pat. No. 1,917,420, granted to C.O. Bachman, generally include straight teeth or fingers, the axis of which is perpendicular to the rotational axis of the pulpstone.
- the instant invention contemplates finger bars having laterally spaced, angularly-oriented fingers angled relative to the pulpstone rotational axis for directing pulp to the lateral ends of the pulpstone from whence pulp falls to a subadjacent pulp collector.
- Angular orientation of the fingers is additionally advantageous in that it has been found that this orientation hinders sliver movement out of a pocket and increases the grinding action thereon, thereby enhancing pulp quality.
- FIG. I is a side elevation of the central section of a multiple pocket pulp grinder, portions thereof being broken away to more clearly depict the environment within which the instant invention functions;
- FIG. 2 is a front elevational view of a section of a finger bar constructed in accordance with the principles of the instant invention
- FIG. 3 is a side elevation of the finger bar, such view being taken along line 33 in FIG. 2 and in the direction indicated;
- FIG. 4 is a bottom plan view ofa section of the underface of the finger bar, such view being taken along line 4-4 in FIG. 3 and in the direction indicated.
- FIG. 5 is a front elevational view of a section of a finger bar showing an alternate embodiment of the instant invention
- FIG. 6 is a side elevation of the finger bar shown in FIG. 5 and taken along line 6-6 thereof, and
- FIG. 7 is a bottom plan view of the underface of the finger bar shown in FIG. 6 and taken along line 77 thereof.
- a multiple pocket pulp grinder is indicated generally by reference 10 and basically includes a pulpstone 12.
- the stone 12 is secured to a drive shaft 14 which is rotated at high speed, in a counterclockwise direction, by conventional power sources (not shown) so that the abrasive peripheral surface of the stone reduces the logs pressed thereagainst into pulp.
- a motor actuated actuator rod 28 is connected to an upstruck flange on the rear of the gate 26 for moving the gate to a retracted position so that magazine 16 can discharge its contents into pocket 18.
- a pressure shoe 30 is connected to a motor actuated piston rod 32 for pressing a charge of logs in pocket 18 against the peripheral face of pulpstone 12.
- Shoe 30 moves radially inwardly along the path defined by the undersurface of gate 26, sloping guideway 34 and between pocket sidewalls (not shown).
- the movement of shoe 30 is coordinated with the opening and closing sequence of gate 26 through controls of conventional design (not shown).
- gate 26 is opened and a charge is released from magazine 16 into pocket 18.
- Rod 28 then moves gate 26 radially inwardly to close the magazine and piston rod 32 gradually moves pressure shoe 30 radially inwardly against the logs within pocket 18.
- Shoe 30 continues to move inwardly until all of the logs held in pocket 18 are reduced and then the cycle of operation is repeated again.
- a similar magazine and pocket arrangement is provided on the left side of the pulpstone.
- a second magazine 44 with a removable top 46, and sidewalls 60, 62, is situated on the upper left side of pulpstone 12.
- a second or down-running pocket 48 receives a charge of logs from magazine 44, and a second gate 50 is disposed therebetween.
- Gate 50 is extended and retracted by a motor actuated actuator rod 52 which is connected to an upstruck flange on rear of the gate.
- the movement of pressure shoe 54 is coordinated with the opening and closing sequence of gate 50 through controls of conventional design.
- a series of water nozzles or showers 68, 70,. 72 and 74 are spaced about, and along upper and lower peripheries of the stone 12.
- the showers spray water onto the stone to cool same and to wash away pulp that clings to the face of the stone towards the collector 20.
- the present invention provides a novel finger bar construction, arrangement and combination as follows.
- the finger bars 42 and 67 may be considered to trail the leading finger bars 43 and 66 in the direction of stone rotation.
- the leading finger bars, 43 and 66 are conventional in construction insofar as the longitudinal axes of the projecting fingers thereof are straight, parallel and perpendicular to the rotational axis of the stone 12.
- the trailing finger bars 42 and 67 are constructed in a unique manner. As shown in FIG. 3, bars 42 and 67 include a top wall 76, a rear wall '78, a foreshortened bottom wall 80, a front wall 82, and an inclined projecting face 84 that extends between the walls 80 and 82 to a plane immediately adjacent to the periphery of the pulpstone. These surfaces define angularly oriented fingers 73 and 75.
- the finger bars are mounted to connection bars 92 as shown in FIG. I.
- Any suitable connectors such as capscrews or the like, make use of spaced holes 86 t fixably secure the finger bars to their respective connection bar elements which are in turn adjustably secured (not shown) to the grinder housing so that the finger bars are in close proximity to the working face of the pulpstone.
- each bar, 42 and 67 comprises right and left halves, the fingers 73 on the right half being oppositely angularly directed to the fingers on the left half so that these fingers are adapted to direct pulp towards the adjacent lateral or axial end of the pulpstone 12.
- first and second sets of oppositely angularly directed slots 88 and 90 are provided extending outwardly in opposite lateral directions from the centerline of finger bar to channelize the pulp.
- the slots 88 and 90 are generally U-shaped in front elevation, as shown in FIG. 4.
- Fingers 73 and 75 have substantially parallel side walls 94, 96 and 98, 100 respectively as shown in FIG. 2.
- the angular orientation of the fingers and slots of the finger bars 42 and 67 is of particular significance in that not only does this orientation aid in directing pulp to the axial ends of the pulpstone, but it additionally binders the passage of slivers out of the pockets 18 and 48 by movement through the slots 88 and 90.
- this angular orientation is a substantial improvement over the conventional straight finger bar arrange ment of the prior art.
- the theory of the sliver movement is not fully understood, it has been found that passage of tangentially traveling slivers through the finger bar slots is substantially retarded by the angled fingers of the present invention. Such slivers appear to abut the inclined side walls of the fingers and passage therethrough is thereby hindered.
- This retarding effect may be enhanced by inclining the finger side walls such that the spacing A shown in FIG. 4 and located between the side walls 94, 96 and 98, at the base of the fingers decreases at some desired rate in the direction towards the outer extremities of the fingers resulting in a smaller spacing at B.
- the leading finger bars 43 and 66 are of a conventional type insofar as the fingers thereof are straight, parallel and include a longitudinal axis which is perpendicular to the rotational axis of the pulpstone 12.
- Such a conventional arrangement at the leading pocket side is preferable in that any slivers that succeed in passing through the slots of the trail-' ing finger bars 42 and 67, are permitted to pass relatively freely through the next leading finger bar into the adjacent pocket without accumulation on the leading finger bar.
- Straight slotted finger bars facilitate such passage.
- pockets l8 and 48 are charged with a supply of logs from magazines l6 and 44. Pressure shoes 30 and 54 urge the logs against the peripheral face of pulpstone l2. Grinding action on the logs produces pulp and objectionable slivers.
- the present inventive angled finger bars trailing each pocket directs pulp to the lateral or axial ends of stone 12, from whence the pulp falls downwardly into collector 20. Sliver movement out of the pockets is substantially impeded by finger bars 42 and 67, such that additional grinding action thereon causes a reduction of slivers to pulp. Additionally by the arrangement of alternate straight and angled finger bars at leading and trailing ends of adjacent pockets, sliver accumulation on the leading finger bar is circumvented and greater efficiency and pulp quality is secured.
- FIGS. 5-7 An alternate form of the instant invention, as shown in FIGS. 5-7, provides a finger bar wherein, in addition to including laterally angled fingers, also teaches a construction wherein such fingers are formed with diverging side walls such that the width of the finger decreases in the direction of pulpstone, such construction having been found as reducing material jamming in the spaces between the fingers.
- a bar 42' is are adapted to be mounted on a connection bar 92 as shown in FIG. 1 through use of any suitable connectors (not shown) in laterally spaced recesses 104 as shown in FIGS. 5 and 6.
- a similar bar would also be substituted for finger bar 67.
- Each bar includes a top wall 106, a rear wall 108, a foreshortened bottom wall 110, a front wall 112, and an inclined projecting face 114 that extends between the walls and 112 to a plane immediately adjacent to the periphery of the pulpstone.
- These surfaces define angularly oriented fingers 116 and 118 as shown in FIG. 5.
- the fingers 116 on the right half of the bar are oppositely angularly directed to the fingers 118 on the left half to direct pulp towards the adjacent lateral or axial ends of the pulpstone 12.
- the spac ing between the adjacent finger sidewalls 120, 122 and 124, 126 increases progressively from points C through E as shown in FIG. 5.
- finger widths F through I progressively decrease from the finger bars leading to trailing edges as shown in FIG. 7.
- the finger side walls 122 and 126 are vertically inclined relative to walls 120 and 124 respectively, such that space width J at the root of the finger, as shown in FIG. 7, increases progressively in the direction toward the outer extremities of the fingers resulting in a larger opening K.
- a finger bar adapt'd for" use in a pulpstone grinder with a rotatably mounted pulpstone said bar comprising:
- each of said fingers includes a generally planar surface at the free extremity thereof, said bar further including a base portion between opposed side walls of adjacent fingers and defining therewith the spacing between the opposed side walls, said opposed side walls of adjacent fingers being inclined relative to each other such that the spacing between said side walls adjacent said base portions of said fingers increases in the direction toward said surface at said free extremity of said fingers.
- a finger bar according to claim 1 wherein said finger bar includes a leading edge for receiving and channeling pulp past a trailing edge and wherein said fingers have side walls extending generally lengthwise between said edges, said side walls of adjacent fingers being oriented in a divergent manner relative to each other from the finger bar's leading to trailing edges.
- a pulpstone grinder for producing pulp from a supply of material comprising:
- pulpstone mounted for rotational movement, said pulpstone having a peripheral grinding surface
- first finger bar position transversely of and in close proximity to the pulpstone periphery and adjacent a trailing side of said pocket to modify the flow of materials processed .by said pulpstone and carried from said pocket, said first finger bar having a plurality of laterally spaced, angularly oriented fingers angled transversely relative to the rotational axis of said pulpstone;
- said first finger bar including fi ngers each of which includes a generally planar surface at the free extremity thereof, said first finger bar further including a base portion between opposed side walls of adjacent fingers and defining therewith a spacing between said opposed side walls, said opposed side walls of adjacent fingers being inclined relative to each other such that said spacing between said side walls adjacent said base portions of said fingers increases in the direction toward said surface at said free extremity of said fingers;
- said first finger bar including a leading edge for receiving and channeling pulp past a trailing edge and wherein said fingers side walls extend generally lengthwise between said edges, said side walls of adjacent fingers being oriented in a divergent manner relative to each other from the finger bars leading to trailing edges;
- a second finger bar position transversely of and in close proximity to said pulpstone periphery and located at a leading pocket side to impede sliver movement and thereby subsequently reduce the slivers to pulp, said second finger bar having a plurality of laterally spaced, straight fingers oriented in line with the radii of said pulpstone, said first and second finger bars defining said pocket.
- a grinder accordirigTo cTaihTz wherein said improvement further comprises a plurality of pockets radially spaced about the circumference of said pulpstone, each pocket cooperating with a magazine radially spaced adjacent to said pocket for supplying material to be processed therein.
Abstract
Description
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14635171A | 1971-05-24 | 1971-05-24 |
Publications (1)
Publication Number | Publication Date |
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US3734419A true US3734419A (en) | 1973-05-22 |
Family
ID=22516986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US00146351A Expired - Lifetime US3734419A (en) | 1971-05-24 | 1971-05-24 | Finger bars for pulpwood grinders |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4165045A (en) * | 1976-09-14 | 1979-08-21 | Hager Juergen | Disintegrating machine for food |
US4351486A (en) * | 1978-12-13 | 1982-09-28 | J. M. Voith Gmbh | Process and a grinding stone for preparing mechanical wood pulp |
DE3409288A1 (en) * | 1983-03-22 | 1984-09-27 | Osakeyhtiö Tampella AB, Tampere | LOCKING DISC FOR A WOOD GRINDING MACHINE |
US5556043A (en) * | 1995-02-06 | 1996-09-17 | Lake Superior Paper Industries | Angled-rib blocking slab for pulpwood grinder |
US6855044B2 (en) * | 2001-03-30 | 2005-02-15 | F.W. Roberts Manufacturing Company, Inc. | Burr for preparing a homogeneous pulpstone surface |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1602211A (en) * | 1925-09-10 | 1926-10-05 | Int Paper Co | Wood grinder |
US1742233A (en) * | 1925-03-09 | 1930-01-07 | Glens Falls Machine Works | Wood-pulp grinder |
US3528618A (en) * | 1967-05-19 | 1970-09-15 | Miag Muehlenbau & Ind Gmbh | Two-press wood grinder |
-
1971
- 1971-05-24 US US00146351A patent/US3734419A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1742233A (en) * | 1925-03-09 | 1930-01-07 | Glens Falls Machine Works | Wood-pulp grinder |
US1602211A (en) * | 1925-09-10 | 1926-10-05 | Int Paper Co | Wood grinder |
US3528618A (en) * | 1967-05-19 | 1970-09-15 | Miag Muehlenbau & Ind Gmbh | Two-press wood grinder |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4165045A (en) * | 1976-09-14 | 1979-08-21 | Hager Juergen | Disintegrating machine for food |
US4351486A (en) * | 1978-12-13 | 1982-09-28 | J. M. Voith Gmbh | Process and a grinding stone for preparing mechanical wood pulp |
DE3409288A1 (en) * | 1983-03-22 | 1984-09-27 | Osakeyhtiö Tampella AB, Tampere | LOCKING DISC FOR A WOOD GRINDING MACHINE |
US4595150A (en) * | 1983-03-22 | 1986-06-17 | Oy Tampella Ab | Blocking slab for pulp grinder |
US5556043A (en) * | 1995-02-06 | 1996-09-17 | Lake Superior Paper Industries | Angled-rib blocking slab for pulpwood grinder |
US6855044B2 (en) * | 2001-03-30 | 2005-02-15 | F.W. Roberts Manufacturing Company, Inc. | Burr for preparing a homogeneous pulpstone surface |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AMCA INTERNATIONALE LIMITEE, STATELESS Free format text: MERGER;ASSIGNORS:MANITOBA ROLLING MILLS (CANADA) LIMITED;LAMINOIRS DU MANITOBA (CANADA) LIMITEE AND KOEHRING COANDA LIMITED (AMALGAMATED INTO);REEL/FRAME:004064/0295 Effective date: 19811231 Owner name: AMCA INTERNATIONAL LIMITED, STATELESS Free format text: MERGER;ASSIGNORS:MANITOBA ROLLING MILLS (CANADA) LIMITED;LAMINOIRS DU MANITOBA (CANADA) LIMITEE AND KOEHRING COANDA LIMITED (AMALGAMATED INTO);REEL/FRAME:004064/0295 Effective date: 19811231 Owner name: AMCA INTERNATIONALE LIMITEE Free format text: MERGER;ASSIGNORS:MANITOBA ROLLING MILLS (CANADA) LIMITED;LAMINOIRS DU MANITOBA (CANADA) LIMITEE AND KOEHRING COANDA LIMITED (AMALGAMATED INTO);REEL/FRAME:004064/0295 Effective date: 19811231 Owner name: AMCA INTERNATIONAL LIMITED Free format text: MERGER;ASSIGNORS:MANITOBA ROLLING MILLS (CANADA) LIMITED;LAMINOIRS DU MANITOBA (CANADA) LIMITEE AND KOEHRING COANDA LIMITED (AMALGAMATED INTO);REEL/FRAME:004064/0295 Effective date: 19811231 |