US3552456A - Debarking machine of the hollow rotor type - Google Patents

Debarking machine of the hollow rotor type Download PDF

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Publication number
US3552456A
US3552456A US808065A US3552456DA US3552456A US 3552456 A US3552456 A US 3552456A US 808065 A US808065 A US 808065A US 3552456D A US3552456D A US 3552456DA US 3552456 A US3552456 A US 3552456A
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United States
Prior art keywords
rotor
tools
pressure
accumulator
power transmitting
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Expired - Lifetime
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US808065A
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English (en)
Inventor
Nils Olof Johansson
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Brundell and Jonsson AB
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Brundell and Jonsson AB
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27LREMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/08Debarking or removing vestiges of branches from trees or logs; Machines therefor using rotating rings

Definitions

  • the invention relates to a debarking machine comprising a hollow rotor carrying debarking tools pivotable to and from the axis of the rotor.
  • the machine is of the type in which hydraulic power transmitting means are adapted to act upon the tools to move them onto the axis of the rotor, while pressure accumulator means are mounted on the rotor to supply pressurized liquid to said power transmitting means.
  • the U.S. Pat. No. 3,333,615 describes a similar de-- barking machine in which the tool force maybe changed by increasing or reducing the amount of liquid in a hydraulicpneumatic pressure accumulator by means of a pump and a valve both operated electrically.
  • the force of the tools 7 may be changed continuously until the desireddebarking effect is obtained.
  • the readjustment needs a rather long "time so that the required tool force is often not obtained until a whole log has been incorrectly debarked in passing through the rotor.
  • the object of the invention is toprovide a'device bymeans of which the force actingon the tools can be changedstepwise and practically instantaneously.
  • at least two pressure accumulators having different pressure levels are provided to be optionally connected to'the hydraulic power transmitting means by. setting valves, whereby a stepwise change of the hydraulic force acting upon the tools is made possible.
  • HO. 1 shows diagrammatically how'a debarking tool may' be operated by means of one of two pressure. accumulators;
  • FIG. 2 shows a similar view of an embodiment with three pressure accumulators
  • FIG. 3 showsan axial section through a portion of thecylimdrical rotor wall and adjacent portion of a stator
  • FIG. 4 shows diagrammatically a radial section through a debarking rotor, in which the device shown in H6. 2" is mounted.
  • FIG. 1 designates a debarking tool secured to a rotatable shaft pivot 6.
  • the tool is show'n'in its initial position before the end surface of a log 7 adapted to be fed intofthe rotor not shown.
  • An arm 8 secured to the shaft pivot 6 'a'nd projecting radially therefrom has its outer end linked-to'a; piston 9 which is movable'in a hydraulic cylinder 10.
  • the inward 'mo vement of the tool 5 into the initial position shown is limited in that the arm 8 hits a rubber-coated stop'm ember 11 secured to the rotor.
  • a conduit 12 connects the rear end of-the cylinder to one end of a cylinder l3which'contains a movable piston 14, and another conduit extends from the conduit 12 m another cylinder l6'likewise containing a movable 'pistoh' l7.'A- normally open valve.
  • l8 disposed in the conduit 15 is closed on supply of current to a solenoid 19, but the V3IVQ18'lS bypassed by a branch conduit'1which contains a nonreturn valve 21 opening in the direction away from the cylinder. 16.
  • the two cylinders 13 and 16 are ada'ptedto functionjas'pressure accumulators.
  • the space 23 behind the piston is filled with gas of high pressure so that'in the initial position shown thelpiston 14 has been moved into contact with-the fo're end wall of the cylinde'r 13.
  • the space 24' behind the-piston 17' in the-cylinder 16' is filled'with gas of lower pressure, but the piston 17 isin tin-intermediatepositionwbecause-thefore" cylinder spacel 25, the system of conduits l2, 15;20 and the cylinder space inside of the piston 9 are filled with an amount of liquid measured correspondingly.
  • the debarking tool 5 is preferably ofth e'iso-called self-'- opening type. ie, it has an edge directed'to'theend surface of the advanced log, and because of its engagement'this edge causes the tool to climb onto th'e'cylindrical surfaceofthe log;
  • the movemeht of the piston 9' causes the piston 14 of the high-pressureaccumulator 13 to be forced back, as the flow of liquid to the low-pressure accumulator 16 is now blocked, and'the tool'is then actuated by the high pressure in the pressure gas'chainber 23.
  • FIG. 2 fdiffers fror nfthe bn'in FIG.- -l only in th'at'a furtherpressureiaccumulator has'ibeen space-23 of which is filled with gasupitoa prcssure betlwee'n ls inserted in the'conduit' 261s controlledby a solenoid and in'the same wayas in H0; I'thevaIVe 18' is bypassed by a branch conduit20'-containihg a nomium; valve2l" which ln theinitialpositioii shown, the piston 14"of the'medium pressure'accumiilator "13' is held in inoperative end posi tion inthe'sarrieway as't'he pis'itori 14 of the high pressure accumulator 13; but also inthiscase'the piston i Tof thelo pressure accumulator l66ccu'pies an intermediate position. If
  • the device described has the advantage that any volume changes in the hydraulic system because of leakage to the surroundings, variations of temperature or an adjustment of the stop member 11 are automatically compensated for by the quantity of liquid in the foremost space 25 of the low-pressure accumulator 16.
  • the maximum pressure in the system is influenced only by a possible leakage of gas from the high-pressure accumulator space 23.
  • FIG. 3 is intended to illustrate how in the known way the electric current may be transmitted to the solenoids mounted in the rotor.
  • 27 designates the cylindrical wall of the rotor
  • the rotor which is externally provided with peripheral grooves to receive driving belts 28. Beside these belts, the rotor carries three slip rings 29, 30, 31 spaced axially and cooperating with resilient brushes 32 mounted on the inside of the surrounding stator 33. Two of the slip rings, 29 and 30, are insulated and each of them is connected to one phase of a source of alternating current, while the third slip ring 31, which need not be insulated, may be connected to earth. Often the third slip ring 31 may be entirely dispensed with in that the rotor may serve as earth.
  • FIG. 4 shows a radial section through a rotor provided with three debarking tools 5 as well as the device shown in FIG. 2.
  • the tools are shown lifted on to the surface of a log 35 introduced into the rotor 34.
  • the cylinders of the pistons 9 linked to the tool arms 8 are by means of conduits 36 permanently in communication with a liquid distribution duct 37 extending in a circle around the inner periphery of the rotor.
  • the three accumulators 13, 13' and 16 are connected to said distribution duct 37 by means of the conduits 12. 26 and 15, respectively.
  • each of the two solenoids l9 and 19' is connected between earth and one of the phases of the alternating current.
  • the switches 38, 39 are open, and thus the solenoid valves 18, 18' are also open, so that the tools 5 are influenced by the low-pressure accumulator 16, the piston 17 of which, in the position of the tools shown, has been moved backwards in relation to the initial position shown in FIG. 2. Owing to the distribution duct 37 all the tools are actuated simultaneously by the adjusted pressure.
  • the slip rings 29-31 mounted around the rotor are here shown in a diagrammatic perspective view.
  • gas pressures in the accumulators may be replaced by springs inserted to act upon the movable pistons.
  • a debarking machine comprising a hollow rotor carrying debarking tools pivotable to and from the axis of the rotor.
  • hydraulic power transmitting means adapted to act upon the tools to move them onto the axis of the rotor, and pressure accumulator means mounted on the rotorto supply pressurized liquid to said power transmitting means, characterized in that at least two pressure accumulators having different pressure levels are provided to be optionally connected to the power transmitting means by setting valves, whereby a stepwise change of the hydraulic force acting upon the tools is made possible.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
US808065A 1968-03-25 1969-03-18 Debarking machine of the hollow rotor type Expired - Lifetime US3552456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE3940/68A SE305066B (sv) 1968-03-25 1968-03-25

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US3552456A true US3552456A (en) 1971-01-05

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US808065A Expired - Lifetime US3552456A (en) 1968-03-25 1969-03-18 Debarking machine of the hollow rotor type

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SE (1) SE305066B (sv)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122877A (en) * 1977-07-05 1978-10-31 Smith Bob R Ring type debarker
US4522242A (en) * 1982-09-30 1985-06-11 Hutson James Henry Hydraulic fed log debarker
US4638705A (en) * 1985-02-26 1987-01-27 Chazalon Michel Machine for trimming and disbudding vine shoots
US5653274A (en) * 1994-08-29 1997-08-05 Johnson; Denis Debarker arms and debarker tips for mounting on log barking machines
US5963174A (en) * 1995-05-09 1999-10-05 Celsiustech Electronics Ab Antenna device in car radar system
US20120305137A1 (en) * 2011-05-31 2012-12-06 Nicholson Manufacturing Ltd. Debarker systems with adjustable rings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE445578B (sv) * 1984-12-21 1986-06-30 Franz Bruno Wroblewski Med tryckfluidum arbetande inrettning av det slag som innefattar en kolv-cylindermekanism med fjedrande arbetssett
FI111610B (sv) * 2000-09-08 2003-08-29 Jouko Huhtasalo Barkningsmaskin av hålrotor typ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196912A (en) * 1961-05-10 1965-07-27 Soderhamns Verkst Er Ab Controlling mechanisms for the tools in a log debarking machine
US3333615A (en) * 1966-06-20 1967-08-01 Nicholson Mfg Company Remotely controllable force mechanism for rotary-ring log barkers
US3361168A (en) * 1965-11-30 1968-01-02 Black Clawson Co Log barker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196912A (en) * 1961-05-10 1965-07-27 Soderhamns Verkst Er Ab Controlling mechanisms for the tools in a log debarking machine
US3361168A (en) * 1965-11-30 1968-01-02 Black Clawson Co Log barker
US3333615A (en) * 1966-06-20 1967-08-01 Nicholson Mfg Company Remotely controllable force mechanism for rotary-ring log barkers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122877A (en) * 1977-07-05 1978-10-31 Smith Bob R Ring type debarker
US4522242A (en) * 1982-09-30 1985-06-11 Hutson James Henry Hydraulic fed log debarker
US4638705A (en) * 1985-02-26 1987-01-27 Chazalon Michel Machine for trimming and disbudding vine shoots
US5653274A (en) * 1994-08-29 1997-08-05 Johnson; Denis Debarker arms and debarker tips for mounting on log barking machines
US5963174A (en) * 1995-05-09 1999-10-05 Celsiustech Electronics Ab Antenna device in car radar system
US20120305137A1 (en) * 2011-05-31 2012-12-06 Nicholson Manufacturing Ltd. Debarker systems with adjustable rings
US9073233B2 (en) * 2011-05-31 2015-07-07 Nicholson Manufacturing Ltd. Debarker systems with adjustable rings

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Publication number Publication date
SE305066B (sv) 1968-10-14

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