EP2029815A1 - Procede d'alignement precis d'un equipement de travail monte de maniere a pouvoir basculer sur un chevalet de levage levable ou abaissable d'une machine de travail - Google Patents

Procede d'alignement precis d'un equipement de travail monte de maniere a pouvoir basculer sur un chevalet de levage levable ou abaissable d'une machine de travail

Info

Publication number
EP2029815A1
EP2029815A1 EP07724652A EP07724652A EP2029815A1 EP 2029815 A1 EP2029815 A1 EP 2029815A1 EP 07724652 A EP07724652 A EP 07724652A EP 07724652 A EP07724652 A EP 07724652A EP 2029815 A1 EP2029815 A1 EP 2029815A1
Authority
EP
European Patent Office
Prior art keywords
tilting cylinder
hydraulic
working
hydraulic pump
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.)
Granted
Application number
EP07724652A
Other languages
German (de)
English (en)
Other versions
EP2029815B1 (fr
Inventor
Gustav Leidinger
Jörg Hermanns
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.)
CNH Industrial Baumaschinen GmbH
Original Assignee
CNH Baumaschinen GmbH
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 CNH Baumaschinen GmbH filed Critical CNH Baumaschinen GmbH
Publication of EP2029815A1 publication Critical patent/EP2029815A1/fr
Application granted granted Critical
Publication of EP2029815B1 publication Critical patent/EP2029815B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2025—Particular purposes of control systems not otherwise provided for
    • E02F9/2041—Automatic repositioning of implements, i.e. memorising determined positions of the implement
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20523—Internal combustion engine
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F15B2211/20584—Combinations of pumps with high and low capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/265—Control of multiple pressure sources
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3133—Regenerative position connecting the working ports or connecting the working ports to the pump, e.g. for high-speed approach stroke
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the invention relates to a method for the positional alignment of tiltable arranged on a lifting and lowering mast of a working machine working equipment, in which the working equipment is moved by means of a tilting cylinder relative to the mast, wherein the tilting cylinder via a directly operated spool with hydraulic oil of a hydraulic pump for working hydraulics is supplied and wherein auxiliary consumers of the working machine are supplied by at least one further hydraulic pump with hydraulic oil.
  • the invention relates to a working machine with a lifting and lowering mast and one with respect to the mast by means of a tilting cylinder arranged tilting work equipment, the tilting cylinder is connected via a directly operated spool with a hydraulic pump for the working hydraulics, and wherein at least one further hydraulic pump intended for the secondary consumer.
  • Mobile working machines in particular wheel loaders, have working equipment which are mounted on the frame of the working machine by means of a lifting and lowering mast.
  • the work equipment especially when working with a bucket
  • the work equipment after emptying the same in a raised position of the mast after lowering it automatically returns to a position at ground support, which without readjustment by the driver continued work, ie a new recording of material in favorable angular position of the blade floor, that is approximately parallel to the ground, allows.
  • it is advantageous to preset the blade bottom in the direction of a certain positive or negative angle of attack can.
  • Wheel loaders of a certain size such as at a starting weight from 7 t, today usually have a hydraulic pilot control for the spool on the lifting and Schaufelkippwerk and occasionally also additional functions are served.
  • a feedforward control for the spool wheel loaders it is known to provide till brieflyautomatiken which bring after activation, the bucket back to the neutral position, ie that position in which it will impinge parallel or with a desired angle to the ground.
  • intervenes in the feedforward control for the tilting function of the blade triggering hydraulic circuit to allow the automatic return in the desired manner in function.
  • the intervention in the pilot control also offers the advantage that only a small flow of oil can be controlled at low pressures.
  • the kinematics systems for lifting and tilting are mainly designed so that the blade is completely dumped in the upper Hubrahmengnagna and impinges when lowering the hoist with its bottom approximately parallel to the ground on this.
  • this only applies when lowering from the uppermost Hubrahmengnagna. If the bucket is lowered in a maximum tilted position from a lower lifting height, there are strong deviations from the parallelism.
  • the object of the invention is to achieve a simple as possible staltet, possibly also retrofittable reminding work equipment a working machine with a directly operated spool control valve to create.
  • This object is achieved in a method of the type described according to the invention that after actuation of a trigger element by the driver, the two hydraulic ports of the tilting cylinder are simultaneously connected via a switch actuated by a control valve with the hydraulic pump for the auxiliary consumers and thereby the tilting cylinder in the direction of Neutral position of the work equipment is moved.
  • the flow of the pump is used for the working hydraulics, but the flow rate of the pump for the secondary consumers.
  • This can e.g. either be removed in front of the hydraulic motor for the fan of the oil cooler, wherein during the short period of remindkippvorganges then the fan in the usually existing freewheeling circuit runs and experiences only a slight drop in speed, or even after the fan.
  • the fan motor is then acted upon at its outlet opening with the pressure required for the tipping back of the blade, which, however, can be absorbed by the fan motor.
  • This switching valve has a circuit diagram that when switching on the automatic recirculation via the trigger element (switch) directs the flow of oil to the two ports of the tilt cylinder, so that this on the principle of a differential cylinder is acted upon, ie the extension speed of the piston rod is determined by the released by her, to be filled by the För- flow of the pump volume.
  • the piston rod In the usual area ratio of piston rod to cylinder of about 1: 4 corresponding to a relative to the cylinder diameter about half the piston rod diameter, the piston rod is extended at a certain flow four times as fast as in the application of the cylinder only on the piston side. Since the flow rate of the hydraulic pump used for the secondary consumers is only about half as large as the flow rate of the hydraulic pump for the working hydraulics, thus the piston rod is extended at about twice the speed compared to the use of the pump for the working hydraulics. Thus, even after triggering of the automatic feedback system in the case of lifting frame positions below the maximum height, it is still achieved that the working equipment (for example a blade) already strikes the ground in its ground-parallel end position. Especially with wheel loaders of the aforementioned weight class (up to about 6 t), this is for a speedy workflow of great advantage in which often material is poured only on a heap, the lifting frame does not need to be raised to its uppermost position.
  • the position of the tilting cylinder is determined and monitored by the control device of the changeover valve, and that the control device of the changeover valve on reaching the predetermined neutral position of the tilting cylinder switches the changeover valve in a position in which the two hydraulic connections of the tilting cylinder of the Hydraulic pump for the auxiliary consumers to be shut off. In this way, an exact alignment of the work equipment in the ensured predetermined neutral position.
  • a 4/2-way valve is preferably used.
  • the invention also provides a working machine with the features of claim 4.
  • the tilting cylinder is provided with a determination device for the tilting cylinder position, which is connected to the control device.
  • the tilting cylinder is preferably designed or connected as a differential cylinder.
  • a check valve is provided in the hydraulic line between the changeover valve and the hydraulic connection on the piston rod side of the tilting cylinder. This check valve ensures proper operation even if the driver at the same time actuates the control slide in the direction of tilting when the automatic return mechanism.
  • the pump can be used for the auxiliary consumers with a smaller displacement than the pump for the working hydraulics to achieve compared to previous systems still superior and meet all operating requirements increasing the adjustment speed.
  • all components forming the system can be kept small due to the lower flow rate.
  • the desired end position of the working equipment e.g., bucket
  • the shutdown takes place only via a small valve size solenoid valve.
  • Such solenoid valves have shutdown times of less than 50 ms.
  • the end position of the blade from the currently prevailing engine speed greatly influenced, since at the same time of a solenoid valve here also added to the tilting piston, which is a multiple of that of the solenoid valve. To compensate for this, additional devices are required in known systems.
  • Fig. 1 is a hydraulic circuit diagram for a wheel loader not shown in detail and in the
  • FIG. 2 to 6 show the individual operating states of the part of the hydraulic circuit diagram according to FIG. 1 relating to the automatic feedback system.
  • a mast 1 is shown schematically.
  • This mast 1 can be raised and lowered at a pivot point 2 and mounted on a wheel loader frame, not shown.
  • a working equipment is articulated at a point of articulation 3, which in the embodiment is in the form of a blade 4.
  • This blade 4 is about a hinge mechanism 5, 6 by means of a generally designated 7 tilting cylinder relative to the mast 1 about the pivot point 3 pivotally.
  • the tilting cylinder 7 has a piston rod 8 and a piston 9 and is located opposite to the piston rod 8. the end in a pivot point 10 also hinged to the frame of the wheel loader.
  • a support rod 11 is fastened, which at its free end carries a control lug 12 which forms part of a tilting cylinder position determination device.
  • a component designed in this example as a proximity switch 13 is arranged as a second part of the tilting cylinder position determining device, which is in operative connection with an electronic control device 15 via an electrical signal line 14, the function of which will be explained in more detail below.
  • the tilting cylinder position determining device can also be realized in other ways. It is essential that it is able to detect that position of the tilting cylinder 8, which corresponds to the predetermined neutral position of the blade 4 with respect to the ground 16 as shown in FIG.
  • the working machine in this case the wheel loader, has a drive motor, for example a diesel engine 17, which drives three hydraulic units, namely a preferably adjustable hydrostatic drive 18, a hydraulic pump 19 for the working hydraulics of the wheel loader and at least one further hydraulic pump 20 for secondary consumers.
  • a drive motor for example a diesel engine 17
  • three hydraulic units namely a preferably adjustable hydrostatic drive 18, a hydraulic pump 19 for the working hydraulics of the wheel loader and at least one further hydraulic pump 20 for secondary consumers.
  • hydraulic oil is conveyed from the hydraulic aggregates 18, 19, 20 out of a tank, generally designated 21, or conveyed back into it.
  • the hydraulic pump 19 for the working hydraulics is used inter alia for a normal actuation of the blade 4 by the driver via the tilting cylinder 7.
  • the pump 19 is connected via a hydraulic line 22 to a control slide 23 which is actuated directly by the driver by means of control levers 24. bar is.
  • the spool valve 23 is connected via a hydraulic line 25 to the piston side 26 and via a hydraulic line 27 to the annular space 28 of the tilting cylinder 7. Further, a line 29 is provided to the tank 21.
  • the hydraulic pump 20 for the secondary consumers serves e.g. for supplying or driving a fan motor 30 of a fan 31.
  • the hydraulic pump 20 is connected via two hydraulic lines 32 and 33 to the fan motor 30, wherein between the two hydraulic lines 32 and 33, an electromagnetic 4/2-way valve 34 is arranged. In the rest position of the valve 34 shown in FIG. 2, the fan motor 30 is connected to the hydraulic pump 20.
  • a pressure relief valve 42 secures the hydraulic pump 20 from.
  • the solenoid valve 34 also has two ports 35, 36, wherein the terminal 35, a hydraulic line 37 is connected, which is in communication with the annular space 28 of the tilting cylinder 7, wherein in this line, a check valve 38 is arranged. To the terminal 36, a hydraulic line 39 is connected, which is in communication with the piston side 26 of the tilting cylinder 7.
  • the electromagnetic 4/2 way valve 34 is connected via an electrical signal line 40 to the control device 15, which in turn is in turn connected to a trigger element 41 designed as a switch.
  • the control device 15 brings the 4/2 way valve 34 in the switching position shown in FIG. 1 and 3, in which both the oil flow of the hydraulic pump 20 and the displaced from the annular space 28 of the tilt cylinder 7, via the terminal 35 flowing oil flow together via the port 36 of the Piston side 26 of the tilting cylinder 7 are supplied, so that the tilting cylinder 7 is acted upon by the principle of a differential cylinder, ie the extension speed of the piston rod 8 is determined by the released by the flow of the hydraulic pump 20 to be filled volume.
  • the solenoid valve 34 the fan motor 30 is decoupled from the hydraulic pump 20.
  • the piston rod 8 of the tilting cylinder 7 is extended as long as the hydraulic pump 20 and thus guided the blade 4 in neutral position until it is determined by the Kippzylin- derpositionsbeticians owned 12, 13 that the predetermined desired maximum extension position of the piston rod 8 and thus the desired neutral position of the Shovel 4 is reached.
  • a corresponding signal is output to the control device 15, which brings the 4/2-way valve 34 in the rest position shown in Fig. 2, so that a further oil flow to the tilt cylinder 7 is excluded from the hydraulic pump 20.
  • FIGS. 2 to 6 show the individual operating states of the automatic feedback system.
  • the return automatic system is not switched on.
  • the solenoid valve 34 switches the flow of the hydraulic pump 20 to free passage to the auxiliary consumer or consumers (e.g., fan motor 30).
  • the terminals 35, 36 of the tilt cylinder 7 are locked by the solenoid valve 34, so that upon actuation of the tilt cylinder 7 via the spool 23 by the driver (via the control lever 24) no mutual interference is given.
  • the tilting cylinder 7 is additionally acted on by the driver in the direction of "tilting" during the automatic tipping process.
  • the piston rod 8 continues to drive, however, the differential action of the tilting cylinder 7 is repealed, since the annular space 28 of the tilting cylinder 7 is connected via the spool 23 to the tank 21.
  • the check valve 38 in the hydraulic line 37 prevents the flow rates of the two hydraulic pumps 19 and 20 can not flow to the annulus 28 of the tilt cylinder 7, but as intended only to the piston side 26.
  • the displaced from the annulus 28 oil flow is directly into the tank 21st directed.
  • the solenoid valve 34 turns off again and there is a circuit diagram of FIG. 2 for the automatic return, but if the driver continues to keep the tipping over the spool 23 to "tilt" keeps the blade 4 continues to move in this direction.
  • the tilting cylinder is 7 during the automatic tipping by the driver additionally applied in the direction of "dumping".
  • a procedure in a loader has no practical meaning, but should be made to the fact that then a Auskippvorgang, as the driver obviously wanted done.
  • both oil flows are conducted from the piston side 26 of the tilt cylinder 7 into the tank 21, while the hydraulic pump 19 for the working hydraulics promotes into the annular space 28, which, however, again via the check valve 38 and the solenoid valve 34 the piston side 26 of the tilting cylinder 7 is in communication.
  • It can be a hydraulic holding force of the tilt cylinder 7 in the size of the product of the piston surface and the pressure of Adjust the relief valve 42 so that the external load can be held in position.
  • the hydraulic pump 20 promotes the secondary consumers via the pressure relief valve 42 in the tank. If the driver then actuates the function "tilting" via the spool valve 23, the annular space 28 of the tilting cylinder 7 is released via the return passage in the spool valve 23 and the piston rod 8 extends in the desired direction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

Procédé d'alignement précis d'un équipement (4) de travail monté de manière à pouvoir basculer sur un chevalet (1) de levage levable ou abaissable d'une machine de travail, l'équipement (4) de travail étant déplacé par rapport au chevalet (1) de levage au moyen d'un vérin (7) de basculement, le vérin (7) de basculement étant alimenté par le biais d'un tiroir (23) de distribution à actionnement direct en huile hydraulique d'une pompe (19) hydraulique pour l'hydraulique de travail et les charges secondaires de la machine de travail étant alimentées en huile hydraulique par au moins une pompe (20) hydraulique supplémentaire, ce qui permet d'obtenir un dispositif de rappel automatique ayant une configuration la plus simple possible, le cas échéant pouvant aussi être monté par la suite, pour l'équipement (4) de travail basculant. Cet objet est réalisé en ce qu'après l'actionnement d'un élément (41) de déclenchement par le conducteur, les deux raccords (35, 36) hydrauliques du vérin (7) de basculement sont reliés simultanément à la pompe (20) hydraulique pour les charges secondaires par le biais d'une vanne (34) inverseuse commandée par un dispositif (15) de commande et en ce que le vérin (7) de basculement est ainsi déplacé en direction de la position neutre de l'équipement (4) de travail.
EP07724652.8A 2006-05-26 2007-04-27 Procede d'alignement precis d'un equipement de travail monte de maniere a pouvoir basculer sur un chevalet de levage levable ou abaissable d'une machine de travail Active EP2029815B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006024731A DE102006024731B3 (de) 2006-05-26 2006-05-26 Verfahren zur lagegerechten Ausrichtung einer an einem heb- und senkbaren Hubgerüst einer Arbeitsmaschine kippbar angeordeten Arbeitausrüstung sowie Arbeitsmaschine
PCT/EP2007/003722 WO2007137662A1 (fr) 2006-05-26 2007-04-27 ProcÉdÉ d'alignement prÉcis d'un Équipement de travail montÉ de maniÈre À pouvoir basculer sur un chevalet de levage levable ou abaissable d'une machine de travail

Publications (2)

Publication Number Publication Date
EP2029815A1 true EP2029815A1 (fr) 2009-03-04
EP2029815B1 EP2029815B1 (fr) 2018-11-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07724652.8A Active EP2029815B1 (fr) 2006-05-26 2007-04-27 Procede d'alignement precis d'un equipement de travail monte de maniere a pouvoir basculer sur un chevalet de levage levable ou abaissable d'une machine de travail

Country Status (4)

Country Link
US (1) US8146356B2 (fr)
EP (1) EP2029815B1 (fr)
DE (1) DE102006024731B3 (fr)
WO (1) WO2007137662A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5027705B2 (ja) 2008-03-25 2012-09-19 株式会社小松製作所 作動油供給装置および建設機械
FR2938561A1 (fr) * 2008-11-20 2010-05-21 Mailleux Dispositif de remise a niveau automatique de l'outil d'un chargeur hydraulique monte sur un tracteur
US10315853B2 (en) 2015-08-10 2019-06-11 Superior Industries, Inc. Conveyor leveling systems and methods
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WO2007137662A1 (fr) 2007-12-06
EP2029815B1 (fr) 2018-11-21
DE102006024731B3 (de) 2007-08-16
US20090107133A1 (en) 2009-04-30
US8146356B2 (en) 2012-04-03

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