EP0211091A1 - Dispositif de commande hydraulique pour un outil monté sur une chargeuse frontale - Google Patents

Dispositif de commande hydraulique pour un outil monté sur une chargeuse frontale Download PDF

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Publication number
EP0211091A1
EP0211091A1 EP85109561A EP85109561A EP0211091A1 EP 0211091 A1 EP0211091 A1 EP 0211091A1 EP 85109561 A EP85109561 A EP 85109561A EP 85109561 A EP85109561 A EP 85109561A EP 0211091 A1 EP0211091 A1 EP 0211091A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
lifting
control valve
lifting cylinder
lines
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Withdrawn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
EP85109561A
Other languages
German (de)
English (en)
Inventor
Jürgen Dipl.-Ing. Fischer
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.)
FISCHER JURGEN DIPL ING
Original Assignee
FISCHER JURGEN DIPL ING
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 FISCHER JURGEN DIPL ING filed Critical FISCHER JURGEN DIPL ING
Priority to EP85109561A priority Critical patent/EP0211091A1/fr
Publication of EP0211091A1 publication Critical patent/EP0211091A1/fr
Withdrawn legal-status Critical Current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
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling

Definitions

  • the invention relates to a hydraulic control device for a front loading device, such as a shovel loader or the like, attached to a vehicle Double-acting lifting cylinder for lifting or lowering the lifting arm, with at least one double-acting tilting cylinder for tilting the working tool, with a hydraulic control valve for the lifting cylinder and the tilting cylinder, and with a control valve that enables the working tool to be guided in parallel and a position that blocks paralleling.
  • Such a control device is known from DE-A 28 34 480.
  • the control valve in its position serving for parallel guidance, connects the annular cylinder space of the lifting cylinder via a first channel to the piston-side cylinder space of the tilting cylinder and, in its other position blocking the parallel guidance, the annular cylinder space of the lifting cylinder via a channel directly with the lifting cylinder control valve.
  • the position of the control valve used for parallel guidance is its basic position, which is independent of the position of the lifting cylinder control valve.
  • the annular cylinder space of the tilt cylinder is connected to the lifting cylinder control valve via a through-channel in the control valve in its basic position and a separate line.
  • the control valve is expediently designed as a solenoid valve so that it is in the basic position in the de-energized state.
  • the lifting cylinder control valve is provided with electrical control contacts for the control valve.
  • This control device has the disadvantage that for tilting the implement at z. B. a load bearing, the annular piston surfaces are pressurized. As a result, relatively high pressures are required in the hydraulic circuit.
  • Another disadvantage is that, due to the hydraulic circuit for kinematic reasons, the lifting cylinders have to be arranged below the lifting arm, but the tilting cylinders have to be arranged above the lifting arm. As a result, a large offset is required for the lifting rocker, which requires a particularly large dimensioning of the lifting rocker for reasons of strength, which thereby becomes relatively heavy.
  • Another disadvantage of the known tilt cylinder arrangement is that the pivoting range of the implement is only limited due to kinematics.
  • the object of the invention is to improve the generic control device so that due to more effective utilization of the hydraulic pressures the crank arm cranking is reduced, the pivoting range of the implement is increased, the risk of kinking of the tilting cylinder piston rods is excluded, and the passive pressures in the tilting cylinders are reduced during "forward leveling" and the refractive power on the implement is increased.
  • the tipping speed of the implement without tools d. H. enlarged without inlet valve and thus a cost advantage can be achieved.
  • the object is achieved in that the annular cylinder spaces of the tilt cylinders are in hydraulic operative connection with the annular cylinder space of the lifting cylinder or the annular cylinder spaces of the lifting cylinders, and that the position of the control valve serving for parallel guidance is the basic position independent of the position of the lifting cylinder control valve , in which a through-channel formed in the control valve connects the piston-side cylinder space of the tilt cylinder to the lifting cylinder control valve via lines.
  • a cranked rocker arm 2 is arranged on the front side thereof so as to be pivotable about a joint, on the free end section of which a working device 3 is pivotally mounted.
  • the lifting arm 2 is pivoted in a known manner by lifting cylinders 10.
  • Below the lifting arm 2 there are furthermore tilting cylinders 20 which are connected to the working device 3 and the lifting arm 2 by means of a pivoting device 27 and when the tilting cylinders 20 act on the working device 3 being pivoted enable the swing arm 2.
  • the implement 3 is fastened to a cross member 19 which can be pivoted about a joint 7 on the free end section of the lifting arm 2.
  • the piston rods 24 of the tilt cylinders 20 are connected by means of joints 4 to levers 8, 9, of which the levers 8 by means of joints 6 on the lifting rocker 2 and the levers 9 by means of joints 5 on the Traverse 19 are attached.
  • the implement 3 swivels up or down by means of the swiveling device 27, two end positions being predetermined in construction (FIGS. 6 and 7).
  • FIG. 2 shows the circuit diagram of the electrohydraulic control device 28, which consists of two tilt cylinders 20, lift cylinders 10, a control valve 30, a lift cylinder control valve 40 and a tilt cylinder control valve 50.
  • the lifting cylinders 10 and tilting cylinders 20 can be acted upon on both sides with hydraulic oil, which is collected in a tank 82 with a hydraulic pump 80.
  • the control valve 30 is designed in a manner known per se as a solenoid valve and can be switched via electrical control contacts 35.
  • the annular cylinder space 21 of the tilt cylinders 20 is connected via lines 26, 90, 16 to the annular cylinder space 11 of the one lifting cylinder 10.
  • the line 90 is connected to a through channel of the control valve 30.
  • the piston-side cylinder spaces 22 of the tilt cylinders 20 are connected via a line 91 to the lifting cylinder control valve 40 and via a line 92 to the tilt cylinder control valve 50.
  • the line 91 is also connected via a line 17 to the annular cylinder space 12 of the other lifting cylinder 10.
  • the lifting cylinder space 13 located under the pistons 14 of the lifting cylinders 10 is connected to the lifting cylinder control valve 40 by means of lines 18, 94.
  • the lifting cylinder control valve 40 is connected to a hydraulic pump 80.
  • a line 81 leads from the lifting cylinder control valve 40 to the tilting cylinder control valve 50, so that hydraulic oil 80 can also act on it.
  • An outlet provided on the tilt cylinder control valve 50 returns excess hydraulic oil to the tank 82.
  • the control valve 30 In its position 0 which serves for parallel guidance, the control valve 30 connects the annular cylinder space 11 of the one lifting cylinder 10 to the annular cylinder space 21 of the tilt cylinders 20 via a first channel formed by the lines 16, 90, 26. In its other position I, which blocks the parallel guidance, connects it the control valve 30 directly connects the annular cylinder chamber 11, 12 of the two lifting cylinders 10 with the lifting cylinder control valve 40 via a channel formed by the lines 16, 17, 91.
  • the position of the control valve 30 which serves for parallel guidance is the basic position which is independent of the position of the lifting cylinder control valve 40, in which a through-channel formed in the control valve 30 connects the piston-side cylinder space 22 of the tilt cylinders 20 via lines 25, 91 to the lifting cylinder control valve 40.
  • a throttle 70 with a check valve 71 is arranged in such a way that when the lifting arm 2 is lowered with the working device 3 from the cylinder chamber 13, the flow rate of hydraulic oil is reduced the lifting cylinder control valve 40 in position c to the tank 82 and when lifting the Lifting arm 2 hydraulic oil flows unthrottled from the hydraulic pump 80 into the lifting cylinder spaces 13 via the lifting cylinder control valve 40 in position a.
  • the lifting cylinder control valve 40 is in the position a and the control valve 30 in its basic position 0.
  • the hydraulic pump 80 delivers oil without throttling when the check valve 71 is open via the lines 94, 18 into the cylinder spaces 13 Hubyzlinder 10.
  • the amount of oil displaced by the displacement of the piston 14 of the cylinder space 11 flows via the lines 16, 90, 26 into the cylinder spaces 21 of the tilt cylinders 20.
  • the oil displaced by the pistons 23 flows from the tilt cylinder spaces 22 via the lines 25, 91 back into the tank 82 via the throttle 60 through the lifting cylinder control valve 40.
  • the amount of oil displaced during lifting of the cylinder chamber 12 flows via the lines 17, 91 directly through the throttle 60 into the tank 82.
  • the throttle 60 ensures that when the lifting arm 2 is lifted, all the cylinder spaces are completely filled with oil.
  • the lifting cylinder control valve 40 is in position c and the control valve 30 is in position 0 for parallel guidance of the implement 3 when the lifting arm 2 is lowered.
  • the hydraulic pump 80 delivers oil without throttling when the check valve 61 is open via the lines 91, 25 into the cylinder spaces 22 of the tilting cylinders 20
  • the oil quantity of the cylinder spaces 21 displaced by the displacement of the pistons 23 flows via the lines 26, 90, 16 into the cylinder space 11 of the one lifting cylinder 10.
  • the oil quantity of the cylinder spaces 13 displaced by the pistons 14 flows through the lines 18, 94 via the throttle 70 and the lifting cylinder control valve 40 back into the tank 82.
  • the cylinder chamber 12 of the other lifting cylinder 10 is supplied with oil directly via the lines 91, 17.
  • the throttle 70 ensures that when the lifting arm 2 is lowered, all the cylinder spaces are completely filled with oil.
  • the piston-side cylinder spaces 22 of the tilt cylinders 20 are connected via lines 25, 92 and the ring-side cylinder spaces 21 of the tilt cylinders 20 via lines 26, 93 to the tilt cylinder control valve 50 located in position a.
  • the connection is made with the tilt cylinder control valve 50 located in position c.
  • FIG. 3 shows modifications of the electro-hydraulic control device 28 .
  • the line 90 is arranged directly between the line 16 and the line 26, bypassing the control valve 30.
  • This makes it possible to use a simple control valve 30.
  • the disadvantage of this circuit is that passive pressures generated on the tilt cylinders 20 are also passed into the lifting cylinders 10 in position I of the control valve 30.
  • 4 shows a variant of the control circuit according to FIG. 2, in which the lifting cylinders 10 are connected via the lines 16, 17 directly to the line 90 which is guided through the control valve 30. In this embodiment, the lifting cylinders 10 are operated directly parallel to one another.
  • FIG. 5 shows an embodiment of the control circuit according to FIG.
  • the design of the electrohydraulic control device 28 ensures that in the cases in which particularly high forces are required, the pressures of the hydraulic oil supplied by the hydraulic pump 80 are applied to the underside of the pistons 23, 14. If only lower forces are to be transmitted, the pressures are applied to the surfaces of the pistons 14, 23 facing the annular cylinder spaces 11, 21.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
EP85109561A 1985-07-30 1985-07-30 Dispositif de commande hydraulique pour un outil monté sur une chargeuse frontale Withdrawn EP0211091A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP85109561A EP0211091A1 (fr) 1985-07-30 1985-07-30 Dispositif de commande hydraulique pour un outil monté sur une chargeuse frontale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85109561A EP0211091A1 (fr) 1985-07-30 1985-07-30 Dispositif de commande hydraulique pour un outil monté sur une chargeuse frontale

Publications (1)

Publication Number Publication Date
EP0211091A1 true EP0211091A1 (fr) 1987-02-25

Family

ID=8193654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109561A Withdrawn EP0211091A1 (fr) 1985-07-30 1985-07-30 Dispositif de commande hydraulique pour un outil monté sur une chargeuse frontale

Country Status (1)

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EP (1) EP0211091A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412113B (de) * 2002-10-02 2004-09-27 Hoerbiger Hydraulik Hyraulische betätigungsanordnung
DE102006003768A1 (de) * 2006-01-25 2007-07-26 Wilhelm Stoll Maschinenfabrik Gmbh Frontlader und Traktorkabine für einen Traktor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122443B (de) * 1960-02-01 1962-01-18 Meiller Fahrzeuge Anordnung zur Steuerung der Hub- und Wippbewegung einer Ladeschaufel an einem Frontlader
US3133653A (en) * 1962-03-23 1964-05-19 A C Anderson Inc Earth loader
FR1401412A (fr) * 1964-04-23 1965-06-04 Faucheux Ets Dispositif de correction par procédé hydraulique du mouvement d'un organe mécanique, par exemple d'une benne, à l'extrémité d'un bras de levage
FR1495487A (fr) * 1966-06-10 1967-09-22 Oleomat Perfectionnements apportés aux dispositifs de chargement montés sur engin de terrassement
DE1484712A1 (de) * 1960-10-11 1969-03-06 Massey Ferguson Inc Hydraulisch betaetigter Bagger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122443B (de) * 1960-02-01 1962-01-18 Meiller Fahrzeuge Anordnung zur Steuerung der Hub- und Wippbewegung einer Ladeschaufel an einem Frontlader
DE1484712A1 (de) * 1960-10-11 1969-03-06 Massey Ferguson Inc Hydraulisch betaetigter Bagger
US3133653A (en) * 1962-03-23 1964-05-19 A C Anderson Inc Earth loader
FR1401412A (fr) * 1964-04-23 1965-06-04 Faucheux Ets Dispositif de correction par procédé hydraulique du mouvement d'un organe mécanique, par exemple d'une benne, à l'extrémité d'un bras de levage
FR1495487A (fr) * 1966-06-10 1967-09-22 Oleomat Perfectionnements apportés aux dispositifs de chargement montés sur engin de terrassement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412113B (de) * 2002-10-02 2004-09-27 Hoerbiger Hydraulik Hyraulische betätigungsanordnung
DE102006003768A1 (de) * 2006-01-25 2007-07-26 Wilhelm Stoll Maschinenfabrik Gmbh Frontlader und Traktorkabine für einen Traktor
EP1813730A2 (fr) * 2006-01-25 2007-08-01 Wilhelm Stoll Maschinenfabrik GmbH Chargeur frontal et cabine pour tracteur
EP1813730A3 (fr) * 2006-01-25 2007-11-14 Wilhelm Stoll Maschinenfabrik GmbH Chargeur frontal et cabine pour tracteur

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