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WO1999041972A1 - Systeme de commande du dispositif d'alimentation d'un dispositif de recolte - Google Patents

Systeme de commande du dispositif d'alimentation d'un dispositif de recolte Download PDF

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Publication number
WO1999041972A1
WO1999041972A1 PCT/FI1998/000158 FI9800158W WO9941972A1 WO 1999041972 A1 WO1999041972 A1 WO 1999041972A1 FI 9800158 W FI9800158 W FI 9800158W WO 9941972 A1 WO9941972 A1 WO 9941972A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic motors
hydraulic
transfer means
branch
control system
Prior art date
Application number
PCT/FI1998/000158
Other languages
English (en)
Inventor
Sakari PINOMÄKI
Original Assignee
Pinomaeki Sakari
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 Pinomaeki Sakari filed Critical Pinomaeki Sakari
Priority to PCT/FI1998/000158 priority Critical patent/WO1999041972A1/fr
Priority to AU62174/98A priority patent/AU6217498A/en
Publication of WO1999041972A1 publication Critical patent/WO1999041972A1/fr

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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
    • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
    • B27B25/02—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed and pressure rollers
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G23/00—Forestry
    • A01G23/02—Transplanting, uprooting, felling or delimbing trees
    • A01G23/08—Felling trees
    • A01G23/083—Feller-delimbers

Definitions

  • the invention relates to a control system for the feeding device in a harvester, for feeding a tree trunk, according to claim 1.
  • the control system is used to control the rate and direction of rotation of a hydraulic motor for three or more feeding means in the feeding device.
  • the feeding device For the reliable operation of the delimbing and cutting devices in a har- vester, it is important that the feeding device operates smoothly.
  • the hydraulic motors for rolls, tracks, wheels, chains, or corresponding devices used as feeding means in the feeding device rotate at a steady and uniform rate. The steady rate must be achieved irrespective of the shape or soiled quality of the trunk to be transferred in the longitudinal direction, the quality of the surface layer, or a variable counter force that can be induced e.g. by the counter force caused by the delimbing device following the feeding device.
  • the feeding device comprises normally three or more feeding devices which are pressed against the trunk usually symmetrically from different sides of the perimeter.
  • the rotational movement of the hydraulic motors in the control system is transmitted to each feeding means, which contributes to the transfer of the trunk in the direction of its longitudinal axis.
  • a difference in the rotational frequencies of these hydraulic motors causes obvious problems when the aim is to feed the trunk smoothly.
  • Slipping occurs between the trunk and the feeding means, when the rate of function of the feeding means exceeds the movement of feeding the trunk.
  • the coupling between the hydraulic motors and the hydraulic tubes in the control system is usually implemented so that slipping of one feeding means can slow down or stop the rotation of the hydraulic motors for other feeding means, as well as direct the volume flow of hydraulic fluid in the hydraulic tubes through only the slipping hydraulic motor.
  • the feeding of the trunk to the delimbing device can involve counter forces which slow down or stop the operation of the feeding means. Halting of the hydraulic motor for the feeding means because of a great moment resistance increases the rotational frequency of the other hydraulic motors, because the volume flow is directed through these. The counter forces can also cause slipping of the feeding means, because their feeding force is not sufficient.
  • the switching of the hydraulic motors for the control system of the feeding device between a line for feeding pressurized hydraulic fluid and a return line for hydraulic fluid can be implemented either as a parallel or a series switching.
  • a problem with parallel switching of the hydraulic motors is that the volume flow is directed to the hydraulic motor which has the greatest rotational frequency, which results in a reduction in the volume flow of other hydraulic motors and thus a decrease of the speed of rotation or even halting.
  • the problem can occur in connection with slipping of the feeding means.
  • it is known to distribute the volume flow in a defined ratio between the hydraulic motors by means of a flow distributor valve or by monitoring the rotational frequencies with electric sensors. Control data obtained from an electronic control device is used to adjust the displacement volume of the hydraulic control volume motor, thereby controlling the speed of rotation.
  • a problem with series switching of the hydraulic motors is that a decrease in the speed of rotation of one hydraulic motor will decrease the speeds of rotation of the other hydraulic motors as well.
  • a decrease in the speed of rotation in the feeding device can occur when the movement of the feeding means is slowed down or stops.
  • the hy- draulic motor of the feeding means in question does not rotate, and the volume flow passed through the hydraulic motor is not sufficient to maintain the rotational frequency of the other hydraulic motors switched in series either.
  • the control system according to the invention is characterized in what will be presented in the characterizing part of claim 1.
  • the volume flow of the hydraulic motor depends on the displacement volume and speed of rotation of the motor, wherein the volume flow of identical hydraulic motors switched in parallel and operating at the same speed is the same, when the ratio of the rotational speed of the hydraulic motors is not changed by power transmission. Consequently, the volume flow of two or more hydraulic motors switched in series with these hydraulic motors is the same, and when the devices are identical, also the rotational speeds are the same.
  • the switching between the hydraulic motors in the control system can be implemented with simple structures, wherein the desired function can be implemented without electrically or mechanically controlled hy- draulic valves incorporated in the hydraulic tubes of the control system. Hydraulic valves induce pressure losses of the pressurized hydraulic fluid and increase the need for space in the control system, thereby complicating the design of the feeding system.
  • the speeds of rotation of the hydraulic motors switched in series can be adjusted, in an inexpensive and simple way, to be the same or in a determined relation to each other, although they are switched to different hydraulic pipe systems.
  • the feeding means operating at different sides of the trunk can operate at the same feeding rate. Consequently, roughness of the trunk, variations in the diameter of the trunk, and changes in the friction between the trunk surface and the feeding means, simultaneously with variations e.g. in the loading of the delimbing device following the feeding means, will not cause slipping or failure of operation of the feeding means.
  • the feeding of the trunk to other devices of the harvester takes place more smoothly and reliably and also in a way that the quality of the trunk remains high, because there are no dam- ages caused by slipping.
  • Barking of the outer layer of the trunk can be implemented by driving the hydraulic motor and a barking machine coupled to the same and used as a feeding means, such as a feeding roll, which is possibly provided with means for barking.
  • a feeding means such as a feeding roll
  • the force of the barking device pressing against the trunk and the rotational frequency of the feeding roll and the difference in the rotational frequencies of the feeding rolls can be selected to achieve a controlled and desired slipping which can be determined by selection of the displacement volume of the hydraulic motor and/or the axle moment transmitted to the barking device.
  • the invention relates also to the use of a control system in barking of a tree trunk with the feeding device of a harvester by means of a con- trolled difference in the speed between transfer means.
  • FIG. 1 is a schematic view on a control system
  • Fig. 2 illustrates an application of a feeding device.
  • a hydraulic fluid supply pipe 2 receives its volume flow from the hydraulic system of a harvester or the like, and a return pipe 3 functions as the return duct for hydraulic fluid.
  • a control valve 4 which is operated electrically from a control cabin or the like in the har- vester, e.g. a one-way valve, is used to control the volume flow of the hydraulic fluid in the pipe system and thereby further the directions of rotation of hydraulic motors 5, 6, 7, and 8.
  • Pressure relief valves 9 and 10 are used to set the pressure of the hydraulic fluid to a determined value, and they are also used as safeguards for the hydraulic motors 5, 6, 7, and 8.
  • the hydraulic fluid coming from the one-way valve 4 is distributed into parallel branches H1 and H2, i.e.
  • the volume flows of these pipe systems are supplied to hydraulic motors 5 and 7 coupled in series as well as to hydraulic motors 6 and 8 coupled in series.
  • the hydraulic motors 5 and 6 are coupled to each other mechanically with a transmission means 13, such as a transmission shaft, by means of which the ratio between the rotational frequencies of the hydraulic motors 5 and 6 is determined on the basis of the transmission ratio of the means 13.
  • the hydraulic fluid coming from the hydraulic motors 7 and 8 is directed (inlets 14a and 14b) to the pipe system 14 and further, by means of the one-way valve 4, to the return pipe 3 and further to the hydraulic sys- tern of the harvester or the like.
  • the electrically controlled one-way valve 4 it is possible to select the direction of rotation of the hydraulic motors 5, 6, 7, and 8 and to prevent the supply of the hydraulic fluid to and from the control system, wherein the hydraulic motors 5, 6, 7, and 8 can be stopped.
  • the dimensions of the hydraulic motors can vary according to the application, and the number of hydraulic motors coupled in series can vary as well. Similarly, the number of parallel hydraulic motors coupled together with a means can be greater than two.
  • the control system can be supplemented with necessary electrically or mechanically controlled hydraulic valves, e.g. to determine the pressure level of the control system in different parts of the control system and to protect the com- ponents.
  • Figure 2 illustrates the application of the control system of Fig. 1 in a feeding device in a harvester, whereby there are three, in this case rolllike transfer means 15, 16 and 17 placed at angular distances-of ca. 120° in the cross-section of a trunk P to effect a transmission force and possibly also barking on the outer surface of the trunk.
  • the feeding device comprises a frame 18 to which the transfer means 15, arranged as a first roll-like drive wheel, is coupled with its hydraulic motors 5, 6 so that the transfer means 15 is coupled to a means 13 effecting power transmission and connecting the hydraulic motors 5, 6 mechanically, particularly a shaft.
  • the hydraulic motor 7 and the transfer means 16, connected therewith by means of a shaft 16a and arranged as a feeding roll, as well as, correspondingly, the hydraulic motor 8 and the transfer means 17, connected therewith by means of shaft 17a and similarly arranged as a feeding roll, are connected to auxiliary frames 19 and 20, respectively, which are articulated with joints on the frame 18 of the feeding device.
  • hydrau- lie actuators (not shown) are provided to maintain the contact between the trunk P and the transfer means 15, 16, 17 as the transfer of the tree progresses.
  • the reference numerals of Fig. 2 correspond to those of Fig. 1.
  • the functional properties of the feeding device can be changed with the number, dimensions and/or positioning of the transfer means, whereby the control system and the related transfer means can be used either in a basic application to achieve merely feeding of the tree trunk in a harvester, or particularly advantageously in the harvesting of e.g. the Eucalyptus tree, whereby in addition to the feeding, also rotation of the trunk around its longitudinal axis and/or barking of the trunk is performed.
  • the transfer means can naturally be also chains, belts, or the like.
  • the means 13 effecting power transmission can be a shaft connecting the output shafts of the hydraulic motors 5, 7, wherein the transfer means is coupled in a way transmitting the torque.
  • the volume selected for the hydraulic motors 7 and 8 (cf. Figs. 1 and 2) is 400 cm 3 and the volume for the hydraulic motors 5 and 6 is 200 cm 3 .
  • the diameter selected for the transfer means 16 and 17 acting as feed rolls is 320 mm and the diameter for the transfer means acting as the drive wheel is 210 mm. It is assumed that the output of the hydraulic pump in the system is 200 l/min.
  • the peripheral speed obtained for the feed rolls 16 and 17 is: 8 99/41972 PCT/FI98/00158
  • the peripheral speed obtained for the drive wheel 15 is:
  • peripheral speed of the drive wheel 15 is 31.4 % greater than the peripheral speed of the feed rolls 16 and 17.
  • the outer surface of the drive wheel is designed e.g. to be provided with threaded grooves so that it pushes the bark being removed from the trunk in the lateral direction with respect to the longitudinal direction of the trunk as it slips against the outer surface of the trunk.
  • the ratio between the peripheral speeds of the transfer means 15, 16 and 17 can be changed by altering the volume of the hydraulic motors 7, 8 resp. 5, 6, and/or by altering the diameter of the feed rolls 16 and 17 in relation to the drive wheel 15. By changing these ratios it is also possible to obtain a different peripheral speed for all of the transfer means 15, 16 and 17 in relation to each other, which can make the removal of the bark from the tree even more effective.
  • the diameter of the drive wheel 15 is changed according to the following calculation:
  • the diameter obtained for the drive wheel 15 is 160 mm, 9 O 99/41972 PCT/FI98/00158

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un système de commande pour dispositif d'alimentation dans un dispositif de récolte du bois, comprenant, conjointement avec un ensemble cadre (18, 19, 20) d'un dispositif d'alimentation, au moins trois moyens de transfert (15, 16, 17) qui sont en relation de transmission avec le tronc pendant le fonctionnement du dispositif d'alimentation; des moteurs hydrauliques (5, 6, 7, 8) commandant les moyens de transfert (15, 16, 17); et un système hydraulique (9, 10, 11, 12, 14) doté de vannes de régulation (4). Les moteurs hydrauliques (5, 6, 7, 8) sont accouplés en parallèle de sorte que l'accouplement parallèle comprenne une première branche (H1) à au moins deux moteurs hydrauliques (5, 7) et une deuxième branche (H2) à au moins deux moteurs hydrauliques (6, 8). Les moteurs hydrauliques de la première et la deuxième branche (H2) sont accouplés en série. Au moins un moteur hydraulique (5, 6) de la première (H1) et la deuxième branche (H2) est accouplé de manière à commander le même moyen de transfert (15). Les autres moteurs hydrauliques (7, 8) des première (H1) et deuxième (H2) branches sont conçus chacun pour commander le moyen de transfert respectif (16, 17).
PCT/FI1998/000158 1998-02-23 1998-02-23 Systeme de commande du dispositif d'alimentation d'un dispositif de recolte WO1999041972A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI1998/000158 WO1999041972A1 (fr) 1998-02-23 1998-02-23 Systeme de commande du dispositif d'alimentation d'un dispositif de recolte
AU62174/98A AU6217498A (en) 1998-02-23 1998-02-23 Control system for the feeding device in a harvester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1998/000158 WO1999041972A1 (fr) 1998-02-23 1998-02-23 Systeme de commande du dispositif d'alimentation d'un dispositif de recolte

Publications (1)

Publication Number Publication Date
WO1999041972A1 true WO1999041972A1 (fr) 1999-08-26

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Application Number Title Priority Date Filing Date
PCT/FI1998/000158 WO1999041972A1 (fr) 1998-02-23 1998-02-23 Systeme de commande du dispositif d'alimentation d'un dispositif de recolte

Country Status (2)

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AU (1) AU6217498A (fr)
WO (1) WO1999041972A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003092359A1 (fr) * 2002-05-03 2003-11-13 Timberjack Oy Accouplement de commandes pour un appareil constitue d'une ebrancheuse combinee a une tronconneuse
EP2106691A1 (fr) * 2008-04-01 2009-10-07 Moisio Forest OY Vindas pour la manipulation du bois
US7644580B2 (en) 2005-12-02 2010-01-12 John Deere Forestry Oy Control coupling for changing the feeding speed of feeding members in a delimbing and cutting apparatus
AU2006202502B2 (en) * 2005-06-13 2010-12-23 Tigercat Industries Inc. Tree feeding control for a tree handling device
DE102011108816A1 (de) * 2011-07-29 2013-01-31 Koller GesmbH Antrieb für einen Greifer eines Harvesters
EP2724611A1 (fr) 2012-10-29 2014-04-30 Waratah OM OY Circuit de commande pour un dispositif
WO2018073495A1 (fr) * 2016-10-21 2018-04-26 Lauri Ketonen Appareil d'amenage pour une moissonneuse d'arbres
WO2023067245A1 (fr) * 2021-10-21 2023-04-27 Ponsse Oyj Circuit de commande pour une tête d'abattage-ébranchage
US11785902B2 (en) 2016-10-21 2023-10-17 Lauri Ketonen Feeding apparatus for a tree harvester

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE429020B (sv) * 1978-02-08 1983-08-08 Doro Verken Mek Ab Matarverk for matning av fellda tred
WO1993019909A1 (fr) * 1992-04-07 1993-10-14 Lastusen Konepaja Oy Unite de recolte
FI97340B (fi) * 1995-01-27 1996-08-30 Outokummun Metalli Oy Puun syöttölaite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE429020B (sv) * 1978-02-08 1983-08-08 Doro Verken Mek Ab Matarverk for matning av fellda tred
WO1993019909A1 (fr) * 1992-04-07 1993-10-14 Lastusen Konepaja Oy Unite de recolte
FI97340B (fi) * 1995-01-27 1996-08-30 Outokummun Metalli Oy Puun syöttölaite

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003092359A1 (fr) * 2002-05-03 2003-11-13 Timberjack Oy Accouplement de commandes pour un appareil constitue d'une ebrancheuse combinee a une tronconneuse
AU2006202502B2 (en) * 2005-06-13 2010-12-23 Tigercat Industries Inc. Tree feeding control for a tree handling device
US7874327B2 (en) 2005-06-13 2011-01-25 Tigercat Industries Inc. Tree feeding control for a tree handling device
US7644580B2 (en) 2005-12-02 2010-01-12 John Deere Forestry Oy Control coupling for changing the feeding speed of feeding members in a delimbing and cutting apparatus
EP2106691A1 (fr) * 2008-04-01 2009-10-07 Moisio Forest OY Vindas pour la manipulation du bois
DE102011108816A1 (de) * 2011-07-29 2013-01-31 Koller GesmbH Antrieb für einen Greifer eines Harvesters
EP2724611A1 (fr) 2012-10-29 2014-04-30 Waratah OM OY Circuit de commande pour un dispositif
WO2018073495A1 (fr) * 2016-10-21 2018-04-26 Lauri Ketonen Appareil d'amenage pour une moissonneuse d'arbres
US11134623B2 (en) 2016-10-21 2021-10-05 Lauri Ketonen Feeding apparatus for a tree harvester
US11785902B2 (en) 2016-10-21 2023-10-17 Lauri Ketonen Feeding apparatus for a tree harvester
WO2023067245A1 (fr) * 2021-10-21 2023-04-27 Ponsse Oyj Circuit de commande pour une tête d'abattage-ébranchage

Also Published As

Publication number Publication date
AU6217498A (en) 1999-09-06

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