EP0776426B1 - Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder - Google Patents

Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder Download PDF

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Publication number
EP0776426B1
EP0776426B1 EP94928429A EP94928429A EP0776426B1 EP 0776426 B1 EP0776426 B1 EP 0776426B1 EP 94928429 A EP94928429 A EP 94928429A EP 94928429 A EP94928429 A EP 94928429A EP 0776426 B1 EP0776426 B1 EP 0776426B1
Authority
EP
European Patent Office
Prior art keywords
jack
cylinder
hydraulic
valve
distribution block
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.)
Expired - Lifetime
Application number
EP94928429A
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English (en)
French (fr)
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EP0776426A1 (de
Inventor
Alain Bourgeois
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0776426A1 publication Critical patent/EP0776426A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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Classifications

    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/008—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors with rotary output

Definitions

  • the present invention relates to a device for hydraulic control of a double-acting cylinder.
  • Double acting hydraulic cylinders are generally supplied with pressurized oil by a electro-hydraulic power plant to which a oil distribution block including a distributor hydraulic or a set of valves controlling the cylinder operation in both directions, especially in the case of differential operation.
  • Such a hydraulic supply device has the disadvantage that if the piping cylinder supply lines are flexible, these pipes may rupture, pressurized oil may leak to the exterior from the broken piping, the cylinder is no longer supplied and the load actuated by the cylinder is no longer held. This can result in in some cases, serious property damage and even possibly accidents that could involve the life of operators.
  • the kinematics of the mobile assembly controlled by the jack must take into account the increase in size due to the presence of the electro-hydraulic power plant nearby of the cylinder.
  • the use of rigid piping does not does not prevent any leakage from the distributor, leaks that always appear when uses a conventional drawer dispenser.
  • the first set HZ of figure 4 is a system comprising a double-acting cylinder combined with a certain number of valves so that if one external pipe the cylinder rod cannot get out of the jack; however the rod can at any time back off if the return line breaks.
  • the KZ system which also includes a cylinder double effect is associated with a certain number of valves to prevent any retraction of the cylinder rod in the event of pipeline rupture; however, nothing is planned to retain the rod at the outlet.
  • this device is extremely complex since it requires kinematics suitable for optimum security, similar to that of the invention.
  • the present invention aims to remedy these disadvantages of providing a feeder hydraulics with a particularly simple design, reduced size, effectively protecting, due to its design, the cylinder against a burst of the piping supplying it with pressurized oil or against a distributor leak.
  • this hydraulic supply device a double-acting cylinder, comprising a central electro-hydraulic supplying pressurized oil to cylinder via piping and block of distribution, is characterized in that the block of distribution, fixed on the cylinder body, directly or at immediate proximity to it, through rigid connecting members, said distribution block comprising a non-return valve connected upstream to a supply piping extending to the power plant electro-hydraulic and downstream to the right chamber of the hydraulic cylinder, via an internal conduit to said block, said valve preventing any return of oil to the central or outward in the event of the rupture of the supply piping and a control valve normally closed electromagnetic connecting the conduit internal to the left chamber of the cylinder, characterized in that that said distribution block further comprises a second internal conduit to said distribution block connecting the left chamber of the cylinder to the oil return piping to the tank via a check valve electromagnetic control, normally closed and incorporated in said distribution block.
  • the following hydraulic supply device the invention which is shown in the drawing, is expected to supply pressurized oil to a double cylinder effect 1 with differential operation.
  • This cylinder 1 comprises a cylindrical body 2 inside which is mounted at sliding a piston 3 secured to a piston rod 4 extending axially outward, through a end of the cylinder body 2, to control the displacement of any load.
  • the piston 3 delimits, inside the cylinder body 2, two chambers, namely a straight chamber 2a in which the rod extends piston 4, and a left chamber 2b.
  • Cylinder 1 is pressurized oil supplied from a power plant electro-hydraulic 5 comprising, in the manner usual, an oil pump 6 driven by a motor electric 7 and the suction port of which is connected by through a pipeline on which is connected a filter 8 to an oil tank 9.
  • the central electro-hydraulic 5 also includes piping 11 oil return to reservoir 9.
  • the operation of the hydraulic supply device of the jack 1 is as follows: to cause the re-entry of the rod, that is to say its displacement from right to left in the drawing, the pump 6 is started. the electro-hydraulic unit 5, which delivers pressurized oil, through the non-return valve 14 of the distribution block 12, into the right chamber 2 a of the jack 1. The excitation of the electromagnetic valve 18 is also controlled which then passes into the open position, the valve 16 remaining in its closed rest position.
  • the pressurized oil arriving through the piping 15 and the internal conduit 13 can then gradually fill the right chamber 2 a of the jack 2, while the oil being in the left chamber 2 b of this jack can return to the tank 9 by passing through the valve 18, in the open position, the internal conduit 17 and the pipe 11 returning to the tank 9.
  • valve 18 To cause the reverse movement, that is to say the exit of the piston rod 4, the valve 18 is kept in the closed position and the valve 16 is however excited to move it to the open position, which establishes communication between the two right chambers 2 a and left 2 b of the jack 1.
  • the pressurized oil from the electro-hydraulic unit 5 flows through the non-return valve 14, into the internal conduit 13 and at from the latter towards the two chambers 2 a , 2 b of the jack 1.
  • the device conforms to one or other of the variants of the invention is advantageously usable in the particular area of the tail lift in particular for a vehicle for which it has not yet never been provided with such a safety device and protection in case of broken pipes pressurized fluid supply.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Claims (2)

  1. Hydraulikversorgungseinrichtung für einen doppeltwirkenden Zylinder (1), mit einer Elektrohydraulikzentrale (5), die den Zylinder (1) mittels einer Leitung (15) und eines Verteilerblocks (12) mit unter Druck stehendem Öl versorgt, der auf dem Körper des Zylinders (1), direkt oder in unmittelbarer Nähe von diesem, mittels starrer Verbindungseinrichtungen (10) befestigt ist, wobei der besagte Verteilerblock ein Rückschlagventil (14) aufweist, das stromaufwärts mit einer Versorgungsleitung (15), die sich bis zur Elektrohydraulikzentrale (5) erstreckt, und stromabwärts durch einen Kanal (13) innerhalb des besagten Blocks (12) mit der rechten Kammer (2a) des Hydraulikzylinders (1) verbunden ist, wobei das besagte Ventil (14) jeglichen Rückstrom von Öl zur Zentrale (5), oder bei einem Bruch der Versorgungsleitung (15) nach außen, sperrt, sowie ein normalerweise geschlossenes Ventil (16) mit elektromagnetischer Steuerung, das den inneren Kanal (13) mit der linken Kammer (2b) des Zylinders (1) verbindet, dadurch gekennzeichnet, daß der besagte Verteilerblock außerdem einen zweiten Kanal (17) innerhalb des besagten Verteilerblocks (12) aufweist, der die linke Kammer (2b) des Zylinders (1) mittels eines normalerweise geschlossenen und in den besagten Verteilerblock (12) eingebauten Ventils (18) mit elektromagnetischer Steuerung mit der Ölrückführleitung (11) zum Tank (9) verbindet.
  2. Verwendung der Vorrichtung gemäß dem vorangehenden Anspruch an der Hebe-Ladeklappe, insbesondere für Kraftfahrzeuge.
EP94928429A 1993-09-22 1994-09-22 Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder Expired - Lifetime EP0776426B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9311276 1993-09-22
FR9311276A FR2710372B1 (fr) 1993-09-22 1993-09-22 Dispositif de commande hydraulique d'un vérin à double effet.
PCT/FR1994/001109 WO1995008715A1 (fr) 1993-09-22 1994-09-22 Dispositif de commande hydraulique d'un verin a double effet

Publications (2)

Publication Number Publication Date
EP0776426A1 EP0776426A1 (de) 1997-06-04
EP0776426B1 true EP0776426B1 (de) 1998-12-23

Family

ID=9451112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94928429A Expired - Lifetime EP0776426B1 (de) 1993-09-22 1994-09-22 Hydraulische steuervorrichtung für einen doppelt wirkenden zylinder

Country Status (5)

Country Link
EP (1) EP0776426B1 (de)
AU (1) AU7786094A (de)
DE (1) DE69415559D1 (de)
FR (1) FR2710372B1 (de)
WO (1) WO1995008715A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365407B (en) 2000-05-25 2003-10-08 Bamford Excavators Ltd Hydraulic system for wheeled loader
US7159662B2 (en) 2004-02-18 2007-01-09 Fmc Technologies, Inc. System for controlling a hydraulic actuator, and methods of using same
US7137450B2 (en) 2004-02-18 2006-11-21 Fmc Technologies, Inc. Electric-hydraulic power unit
US6998724B2 (en) 2004-02-18 2006-02-14 Fmc Technologies, Inc. Power generation system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953118A (en) * 1956-04-05 1960-09-20 Francis S Flick Port fitting
US4079988A (en) * 1977-02-28 1978-03-21 Peabody International Corporation Elevating tailgate
DE2950852A1 (de) * 1979-12-18 1981-09-24 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Ladevorrichtung fuer lastfahrzeuge
DE4120170A1 (de) * 1991-06-19 1992-12-24 Bosch Gmbh Robert Druckmittelbetaetigbarer arbeitszylinder
DE9305980U1 (de) * 1993-04-20 1993-08-05 Leibfried Maschinenbau GmbH, 71083 Herrenberg Pneumatikzylinder

Also Published As

Publication number Publication date
AU7786094A (en) 1995-04-10
FR2710372A1 (fr) 1995-03-31
FR2710372B1 (fr) 1995-11-17
WO1995008715A1 (fr) 1995-03-30
DE69415559D1 (de) 1999-02-04
EP0776426A1 (de) 1997-06-04

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