EP2189577A1 - Automatische Ausrichtung des Werkzeuges eines an einem Traktor montierten Hubgerüstes - Google Patents

Automatische Ausrichtung des Werkzeuges eines an einem Traktor montierten Hubgerüstes Download PDF

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Publication number
EP2189577A1
EP2189577A1 EP09176339A EP09176339A EP2189577A1 EP 2189577 A1 EP2189577 A1 EP 2189577A1 EP 09176339 A EP09176339 A EP 09176339A EP 09176339 A EP09176339 A EP 09176339A EP 2189577 A1 EP2189577 A1 EP 2189577A1
Authority
EP
European Patent Office
Prior art keywords
tool
solenoid valve
hydraulic
cylinder
tipping cylinder
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Withdrawn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
EP09176339A
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English (en)
French (fr)
Inventor
Loïc MAILLEUX
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.)
Mailleux SA
Original Assignee
Mailleux SA
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 Mailleux SA filed Critical Mailleux SA
Publication of EP2189577A1 publication Critical patent/EP2189577A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/434—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like providing automatic sequences of movements, e.g. automatic dumping or loading, automatic return-to-dig
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
    • E02F3/439—Automatic repositioning of the implement, e.g. automatic dumping, auto-return
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position

Definitions

  • the present invention relates to a hydraulic loader, adapted to be mounted on a tractor or a self-propelled chassis, and which comprises an automatic leveling device of the tool carried by said loader.
  • chargers there is the so-called “telescopic” charger, intended to be mounted on a self-propelled chassis and used in particular for handling operations and the so-called “front-end” charger, intended to be mounted at the front of a tractor, especially for agricultural use.
  • a front loader conventionally comprises a pivoting lifting member, such as a stretcher, formed of a pair of bent arms, integral with each other, whose free end carries an articulated tool, particularly able to take, carry, then release a charge.
  • a pivoting lifting member such as a stretcher
  • the tool is interchangeable; among the tools usually used include, but not limited to, a bucket, a claw, a pair of jaws, a blade and a fork pallet.
  • a pair of lifting cylinders connected in parallel are each associated with one of the arms of the stretcher.
  • each arm At the front end of each arm, between its bent zone and the tool is mounted a double-acting hydraulic cylinder, generally designated “tipping cylinder", whose function is to ensure the pivoting of the tool relative to the stretcher, either upwards or downwards.
  • tipping cylinder a double-acting hydraulic cylinder
  • the loader is generally provided with a pair of lifting cylinders and a pair of tipping cylinders
  • a telescopic loader comprises a pivotable lifting member, such as a telescopic arm, adapted to be raised or lowered also by means of a lifting jack.
  • the telescopic arm comprises several sections that can slide and fit into each other.
  • This telescopic arm carries a tool, for example of the type of one of the aforementioned tools.
  • a tipping cylinder is also mounted at the front of the telescopic arm to ensure the pivoting of the tool relative to this arm, either upwards or downwards.
  • the controls for the lift cylinder and the tipping cylinder are made from a source of pressurized hydraulic fluid, via appropriate distributor valves, by means of a control device.
  • a control device such as a joystick with multidirectional orientation driven by the driver of the tractor or the self-propelled chassis, which lever will be called conventionally hereinafter "manipulator”.
  • This control is performed, in a conventional manner, by means of a hydraulic distributor comprising a drawer whose movement is provided by said manipulator.
  • a given level of the tool that is to say a predefined angular orientation of the tool relative to the lifting member.
  • the floor picking assumes that the stretcher is in the low position and that the mouth of the bucket is substantially horizontal, which corresponds to a given direction -dite level of the bucket relative to the stretcher.
  • An object of the invention is to provide a hydraulic loader provided with a device for performing this automatic leveling function on a conventional control system of the tipping cylinder which is not initially provided for this, because it comprises a conventional hydraulic distributor, for example three positions of the kind mentioned above.
  • the high pressure hydraulic distributor comprises a coupling module to a low pressure hydraulic control circuit from the manipulator.
  • Another object of the invention is to provide a device of the kind indicated which is inexpensive, reliable and easy to use.
  • the invention relates to a hydraulic loader, adapted to be mounted on a tractor or a self-propelled frame, this loader comprising a lifting member adapted to be raised or lowered by means of a lifting jack, and being provided with its free end of a pivoting tool whose orientation, in one direction or the other, is controlled by means of a double-acting hydraulic cylinder, called tipping cylinder, controlled by a hydraulic distributor.
  • This charger is characterized in that this automatic leveling device comprises a solenoid valve mounted on the control circuit hydraulic cylinder of the tipping cylinder, and interposed between the hydraulic distributor and the tipping cylinder, automatic control means of this solenoid valve being provided which isolate at least one of the two chambers of the tipping cylinder when an angular orientation predetermined, so-called "level", of the tool relative to the lifting member has been reached, which has the effect of then maintain the immobilized tool in this relative orientation.
  • this automatic leveling device comprises a solenoid valve mounted on the control circuit hydraulic cylinder of the tipping cylinder, and interposed between the hydraulic distributor and the tipping cylinder, automatic control means of this solenoid valve being provided which isolate at least one of the two chambers of the tipping cylinder when an angular orientation predetermined, so-called "level", of the tool relative to the lifting member has been reached, which has the effect of then maintain the immobilized tool in this relative orientation.
  • reference 1 represents an agricultural tractor which is equipped at the front with a front loader, the latter comprising a lifting member 2 provided with an interchangeable tool O.
  • This charger is of known type, for example of the kind marketed by the applicant under the commercial designation "MX" (registered trademark).
  • the lifting member 2 comprises a pair of angled parallel arms 20, integral with each other, and forming a stretcher which is articulated about an axis 21 on a frame 10 attached to the tractor.
  • a hydraulic jack 3, double or single acting, is interposed between the tractor 1 and the stretcher 2.
  • the cylindrical body -or "pot" -30 of the jack 3 is attached to the stretcher 2, via a hinge pin, while the end of its piston rod 31 is fixed to the frame 10, also via a hinge pin.
  • the tool O is articulated at the front end of the stretcher 2 about an axis 22.
  • the reference 9 designates a tipping cylinder, which is interposed between the stretcher and the tool, and serves to rotate it in one direction or the other, around the axis 22. In practice it is also generally provided a pair of identical tipping cylinders, each mounted on an arm 20, and working together in synchronism.
  • the body 90 of the jack is articulated to the stretcher 2 by means of a hinge pin 904; the free end of its piston rod 91 is articulated by an axis 901 on a pivoting rod 902, itself articulated on the stretcher and connected to the tool holder frame by a tie 903; the assembly forms a deformable parallelogram, as is well known.
  • the extension of the tipping cylinder 9 causes the tool O to pivot about the axis 22, in the direction of the spill symbolized by the arrow D.
  • the tipping cylinder 9 is supplied with high pressure hydraulic fluid, from a high pressure source HP represented by a pump P and a return to the tank R at low pressure BP (atmospheric pressure) via a hydraulic distributor 4.
  • HP high pressure source
  • BP atmospheric pressure
  • it is a three-position slide valve, whose movement is controlled by a manipulator, such as an articulated lever 5, accessible by the operator.
  • Line 51 in broken lines symbolizes the means of transmission of movement - mechanical or otherwise - this lever to the drawer.
  • the median (or neutral) position of the drawer which corresponds to the state represented on the figure 1 , is a rest position that the drawer normally occupies, in the absence of solicitation of the manipulator.
  • each of the two chambers of the tipping cylinder is isolated, and the tool is immobilized in a given orientation, which is a function of the degree of extension of the cylinder.
  • the hydraulic fluid HP supplied by the pump returns directly to the reservoir R.
  • the flow rate of this pump remains available to possibly supply other cylinders or hydraulic systems useful for the work in progress.
  • the distributor 4 is connected to the chambers 9A and 9B by conduits respectively designated 900 and 910.
  • the large chamber 9A is supplied with HP hydraulic fluid via the conduit 900 (arrow i 1 ) while the small chamber 9B is at low pressure BP, the hydraulic fluid returning to the reservoir through the conduit 910 (arrow j 1 ).
  • the passage of the drawer from its rest position to one of its active positions does not correspond to a change of state brutal, all-or-nothing kind, contrary to what might suggest the simplified representation of the hydraulic distributor.
  • the dispenser drawer has cavities with gradually variable profile, which allow the operator to dose and vary at will the feed rates of the tipping cylinder, both for spillage and for digging, and thus to control the speed of pivoting of the tool.
  • a solenoid valve 6 is interposed on the hydraulic circuit which connects the distributor 4 to the jack 9.
  • this solenoid valve is mounted on the conduit 910.
  • the loader is equipped with a known type of position sensor 8, making it possible to control the degree of extension of the tipping cylinder 9 and, consequently, the angular orientation of the tool O with respect to the stretcher 2 this orientation being directly a function of this degree of extension.
  • the sensor is adjustable, manually or automatically, so that the operator can set exactly the desired detection position, corresponding to a reference position, "level", position that may be different depending on the type of work performed and / or the type of tool used.
  • the manipulator 5 is provided with a push button 50 equipped with a sensor responsive to the pressure exerted.
  • the solenoid valve 6 is a 2/2 type valve (2 ports / 2 positions).
  • the solenoid valve 6 can be actuated by an electromagnet 60 controlled by a control and control unit 7, via an electrical connection 70 represented by a dashed line.
  • This unit 7 is itself connected by electrical connections 80 and 52 respectively to the position sensor 8 and to the sensor of the push button 50.
  • the sensor 8 provides a signal "0" (no signal) when the reference position is not reached, and a signal “1” (positive signal) when this position is reached.
  • the sensor of the pushbutton 50 meanwhile, provides a signal "0" (no signal) when it is not loaded, and a signal "1" (positive signal) when the operator has actuated the button push and maintains it actuated, for example by pressing a finger.
  • the unit 7 is thus programmed to actuate the electromagnet 60, to switch the solenoid valve 6 from the idle state to the active state, when each of the two signals delivered to it, by the position sensor. and by the sensor of the push button, are signals "1", and in this case only.
  • This tilting of the solenoid valve has the effect of closing off the conduit 910 and thus isolating the small chamber of the jack 9, so that the hydraulic liquid contained therein is trapped, which freezes the cylinder and, correspondingly immobilizes the tool, in the desired reference position, in accordance with the desired objective.
  • the pump P of the hydraulic circuit rises under pressure, and its flow remains available for another use.
  • the control circuit of the tipping cylinder can then function again in a conventional manner, as if the solenoid valve 6 did not exist.
  • the solenoid valve variant shown on the figure 3 , and bearing the reference 6 ', is of type 4/2 (4 ports / 2 positions).
  • solenoid valves 6 or 6 ' it may be interesting to use one or other of the two types of solenoid valves 6 or 6 '.
  • the solenoid valve variant 6 "of the figure 4 is of mixed type, allowing it to be used, selectively, both in a functionally similar configuration of the solenoid valve 6 (with pump pressure increase and available flow rate) than in a functionally similar configuration of the solenoid valve 6 '( without pressure increase of the pump and without available flow).
  • the 6 "solenoid valve is 6/2 (6 ports / 2 positions).
  • Distributor side it has two orifices, just like the solenoid valve 6 '.
  • the tipping cylinder On the side of the tipping cylinder, it has four holes.
  • valve 6 On the same side, is associated with the solenoid valve 6 "a circuit comprising two ducts 610 - 611 passing through a valve” valve "61, voluntarily controlled (for example manual) type 2/2, similar to the valve 6.
  • valve In the state represented on the figure 4 the valve is closed (prohibiting communication between conduits 610 and 611).
  • the solenoid valve 6 is at rest and the feeding of the tipping cylinder from the hydraulic distributor is done in a traditional way, as if this solenoid valve did not exist.
  • the two ducts 900 and 910 are closed, which isolates the two chambers of the tipping cylinder.
  • the two ducts from the distributor 4 are also closed since they are placed in communication with the ducts 610 and 611 themselves closed (because the valve 61 is closed).
  • valve 61 is open.
  • solenoid valve 6 When solenoid valve 6 "is at rest, the feeding of the tipping cylinder from the hydraulic distributor is done in a traditional way, just as in the previous configuration, as if this solenoid valve did not exist.
  • the two ducts 900 and 910 are closed, which isolates the two chambers of the tipping cylinder, also as in the previous configuration.
  • the structure and the operating principle of the automatic leveling device are identical to what has just been described, the tipping cylinder 9 being in this case mounted on the telescopic arm and the O tool pivoting to the end of this arm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP09176339A 2008-11-20 2009-11-18 Automatische Ausrichtung des Werkzeuges eines an einem Traktor montierten Hubgerüstes Withdrawn EP2189577A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0857887A FR2938561A1 (fr) 2008-11-20 2008-11-20 Dispositif de remise a niveau automatique de l'outil d'un chargeur hydraulique monte sur un tracteur

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EP2189577A1 true EP2189577A1 (de) 2010-05-26

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EP09176339A Withdrawn EP2189577A1 (de) 2008-11-20 2009-11-18 Automatische Ausrichtung des Werkzeuges eines an einem Traktor montierten Hubgerüstes

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EP (1) EP2189577A1 (de)
FR (1) FR2938561A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9932213B2 (en) 2014-09-15 2018-04-03 Crown Equipment Corporation Lift truck with optical load sensing structure
IT202000022744A1 (it) * 2020-09-25 2022-03-25 Cnh Ind Italia Spa Metodo e dispositivo di controllo di attuazione di una pala meccanica di un veicolo da lavoro

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2096246A5 (de) * 1970-06-12 1972-02-11 Sperry Rand Corp
DE3541509A1 (de) * 1985-11-23 1987-07-30 Stoll Maschf Gmbh Wilhelm Front- oder hecklader mit hydraulischer geraete-betaetigung
EP0391808A1 (de) * 1989-04-07 1990-10-10 Fdi- Sambron, Societe Anonyme Teleskopische Hebevorrichtung für ein Fahrzeug, insbesondere für einen Lader
DE10012389A1 (de) * 2000-03-14 2001-09-27 Orenstein & Koppel Ag Arbeitsmaschine
DE102006024731B3 (de) * 2006-05-26 2007-08-16 Cnh Baumaschinen Gmbh Verfahren zur lagegerechten Ausrichtung einer an einem heb- und senkbaren Hubgerüst einer Arbeitsmaschine kippbar angeordeten Arbeitausrüstung sowie Arbeitsmaschine
WO2007125120A1 (fr) 2006-05-02 2007-11-08 Mailleux Dispositif de commande hydraulique de vérins de machines et ses applications

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2096246A5 (de) * 1970-06-12 1972-02-11 Sperry Rand Corp
DE3541509A1 (de) * 1985-11-23 1987-07-30 Stoll Maschf Gmbh Wilhelm Front- oder hecklader mit hydraulischer geraete-betaetigung
EP0391808A1 (de) * 1989-04-07 1990-10-10 Fdi- Sambron, Societe Anonyme Teleskopische Hebevorrichtung für ein Fahrzeug, insbesondere für einen Lader
DE10012389A1 (de) * 2000-03-14 2001-09-27 Orenstein & Koppel Ag Arbeitsmaschine
WO2007125120A1 (fr) 2006-05-02 2007-11-08 Mailleux Dispositif de commande hydraulique de vérins de machines et ses applications
DE102006024731B3 (de) * 2006-05-26 2007-08-16 Cnh Baumaschinen Gmbh Verfahren zur lagegerechten Ausrichtung einer an einem heb- und senkbaren Hubgerüst einer Arbeitsmaschine kippbar angeordeten Arbeitausrüstung sowie Arbeitsmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9932213B2 (en) 2014-09-15 2018-04-03 Crown Equipment Corporation Lift truck with optical load sensing structure
IT202000022744A1 (it) * 2020-09-25 2022-03-25 Cnh Ind Italia Spa Metodo e dispositivo di controllo di attuazione di una pala meccanica di un veicolo da lavoro
WO2022064021A1 (en) * 2020-09-25 2022-03-31 Cnh Industrial Italia S.P.A. Method and device for controlling the actuation of a mechanical bucket of a working vehicle (wl)

Also Published As

Publication number Publication date
FR2938561A1 (fr) 2010-05-21

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