EP0330575B1 - Hydraulischer Kreislauf mit zugehörigem Sicherheitsventil für hydraulische Verbraucher - Google Patents

Hydraulischer Kreislauf mit zugehörigem Sicherheitsventil für hydraulische Verbraucher Download PDF

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Publication number
EP0330575B1
EP0330575B1 EP89400508A EP89400508A EP0330575B1 EP 0330575 B1 EP0330575 B1 EP 0330575B1 EP 89400508 A EP89400508 A EP 89400508A EP 89400508 A EP89400508 A EP 89400508A EP 0330575 B1 EP0330575 B1 EP 0330575B1
Authority
EP
European Patent Office
Prior art keywords
valve
orifice
hydraulic circuit
pressure
circuit according
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
EP89400508A
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English (en)
French (fr)
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EP0330575A1 (de
Inventor
Maurice Tardy
Louis Marcon
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.)
Marrel SA
Original Assignee
Marrel 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 Marrel SA filed Critical Marrel SA
Priority to AT89400508T priority Critical patent/ATE88548T1/de
Publication of EP0330575A1 publication Critical patent/EP0330575A1/de
Application granted granted Critical
Publication of EP0330575B1 publication Critical patent/EP0330575B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87499—Fluid actuated or retarded
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87555—Having direct response valve [e.g., check valve, etc.]
    • Y10T137/87563—With reverse flow direction

Definitions

  • the present invention relates to a hydraulic circuit of the kind used to control a machine, a machine tool, a public works machine, in aviation, or on vehicles. various.
  • a circuit is generally controlled by at least one hydraulic distributor.
  • a hydraulic circuit of the aforementioned kind most often includes flexible pipes ensuring the control of jacks or the like, for example for handling a load.
  • a safety problem arises in the event of a rupture of a pipe ensuring the supply of a jack.
  • the present invention aims to solve this problem by ensuring the safety of users, even in the event of a broken pipe in a circuit controlling the handling of a load.
  • load handling it aims in particular to allow the load to be immobilized during the lifting phase and, during the descent phase, the normal continuation of its movement and / or its stopping on order.
  • a safety valve in permanent standby in the hydraulic circuit, normally authorizing a flow of fluid only in one direction between its inlet and outlet ports, a flow of fluid in the other direction. requiring the application of a pilot pressure which is normally applied by the pilot but which, in the event of a pipeline rupture, may appear due to the exceeding of a pressure threshold at the orifice exit.
  • valve makes it possible, for example, to control fluid flows under approximately 400 bars with pilot pressures less than or equal to only 25 bars.
  • Figure 1 illustrates a hydraulic receiver 1 consisting of a double-acting cylinder whose chambers 1A and 1B are connected by pipes 2 and 3 to a pressure source 4, here constituted by a pump, and at a pressure well 5 by a controlled distribution-switching valve 6.
  • the pipes 2 and 3 for example made up of flexible pipes, are fitted with pressure relief valves 7 and 8 ; similarly, a pressure relief valve 9 is interposed between the pressure source and the controlled valve 6.
  • the controlled valve 6 has three positions corresponding respectively to the pressurization of one or the other, or none of the chambers 1A and 1B of the jack.
  • This valve is controlled by a manipulator 10 connected, to a pressure source 11 by a pipe 12 equipped with a pressure relief valve 13, and to a pressure well 14.
  • At least one of the pipes 2 and 3, here the pipe 2, is fitted with a safety valve 15 which protects the corresponding jack chamber (1A).
  • This safety valve 15 has three inputs A, B and Z respectively connected to the pipe 2, to the chamber 1A and to a pilot pipe 16 connected, on the one hand, to the manipulator 10 and, on the other hand, to the controlled distribution-switching valve 6.
  • a controlled valve 17 with two positions chosen according to the pilot pressure applied to the input Z.
  • One of the positions (rest) corresponds to the interposition between A and B d ' a non-return valve preventing any movement from B to A while the other position (in the event of non-zero pilot pressure) allows free movement between B and A.
  • This valve advantageously admits intermediate positions between these extreme positions allowing a flow from B to A which increases with the pilot pressure.
  • a calibrated pressure relief valve 18 which allows circulation from B to Z beyond a limit pressure threshold in chamber 1A.
  • a nozzle 19 is interposed between this pressure relief valve as well as the controlled valve 17, and the inlet Z.
  • the chamber 1A can be pressurized via the pipe 2.
  • the safety valve 15 ensures that the load is maintained this chamber as long as no pilot pressure is applied at Z. This makes it possible to avoid any accident for a possible load that the jack is handling and for people in the vicinity.
  • the presence of the pressure relief valve 18 prevents any exaggerated increase in the pressure in the chamber 1A.
  • the latter authorizes a flow of fluid which, due to the fact that its flow rate to the manipulator 10 is limited by the nozzle 19, induces a pilot pressure on the controlled valve 17 whose amplitude controls a more or less significant flow from B to A until the pressure in the chamber 1A returns below the above-mentioned threshold, which brings the pressure relief valve 18 back to the blocked state. This results in a slow and limited emptying of the chamber 1A.
  • FIG. 1A is shown, by way of isolation, an alternative embodiment 15 ′ of the safety valve of FIG. 1.
  • This second valve differs from the first by the presence of a leakage drain 50 communicating a backpressure chamber associated with the controlled valve 17 with a leakage orifice Y.
  • a non-return valve with adjustable threshold 51 is advantageously provided on this drain. By adjusting this threshold, the counter-pressure opposite to the pilot pressure is acted on to control the controlled valve. This facilitates coordinated control of several safety valves.
  • the control chamber of the valve 17 is controlled by an element 52 adapted to be exclusively traversed by a pilot fluid coming from the valve 18 or from the orifice Z.
  • FIGS. 2 to 4 illustrate an embodiment of the safety valve 15.
  • This valve is formed from a block of several elements in which various conduits are formed connecting orifices 20, 21 and 22 corresponding respectively to the orifices A, B and Z of FIG. 1.
  • the inlet orifice 20 is connected to a main conduit 23 terminating in a pressure chamber 24 in free communication with the outlet orifice 22 by channels 25 located above and below the section plane of the figure 2.
  • a non-return valve 26 applied to its seat by a spring 26A is interposed in this circuit 23 between the inlet orifice 20 and the pressure chamber 24.
  • a balancing channel 26B putting the chamber of the spring 26A in communication with the chamber 24.
  • the conduit 23 also leads to a chamber 27 in which slides a sleeve 28 forming a drawer integral with a valve 29 preventing, in the closed position, any reflux of fluid from the chamber 24 towards the chamber 27.
  • This sleeve 28 is guided in sliding, in a sealed manner, by bearing surfaces 30 and 31 framing the communication of the main conduit 23 with the chamber 27.
  • holes 28A are provided near the valve part 29 and, near its opposite end, holes 28B.
  • a ring of orifices 28 C smaller than the orifices 28 B is formed near the latter, on the side of the orifices 28A. Normally, these various orifices do not communicate with the main conduit 23.
  • valve 29 integral with the sleeve 28, there is provided a channel closed by a control and pressure balancing valve 32, subjected to the action of a spring 32A, normally preventing any flow from 24 to 27.
  • the pressure chamber 24 communicates moreover, by a conduit 33, with a control chamber 34 in communication, through a nozzle 22A, with the control orifice 22.
  • the flow from 24 to 34 is normally prevented by a valve 35 subjected to a calibration spring 35A.
  • This pilot chamber 34 is also in communication, through a pilot channel 36, with an operating chamber 37 in which slides a piston 38 provided with a rod 39 forming a pusher and subjected to a restoring force by a spring 40.
  • This rod 39 extends into the chamber 27 and its end is near and in the extension of the valve 32 for controlling the sleeve-drawer 28. After having forced the opening of the valve 32, the rod 39 is adapted to come wear directly on the valve 29 of the drawer 28 and thus check its position in chamber 27.
  • the piston rod is slidably mounted in a cap 41 in which it defines a balancing chamber with variable volume 42 placed in communication with the chamber 27 of the sleeve by a balancing duct 43 formed longitudinally in the stem.
  • the elements 26, 28, 32, 38 and 39 generally constitute the controlled valve 17 of FIG. 1, except that the non-return valve 26 is here independent of the controlled drawer. In a variant not shown, this valve 26 and the section of conduit which contains it can be omitted if the orifices 28B or 28B 'normally open out between the bearing surfaces 30 and 31.
  • the elements 33, 35, 35A and 36 generally constitute the pressure relief valve 18 of FIG. 1.
  • the nozzle 22A corresponds to that marked 19 in FIG. 1.
  • This device makes it possible, when an earthmoving machine is used to handle loads, to ensure the safety of people and equipment.
  • the operator can continue to deposit the load he was handling, without danger to him and the people accompanying him.
  • the device maintains the load in position, thanks to the flap closures.
  • valve 15 ' is similar to that shown in Figures 2 to 4, except that the chamber 37' where the piston 38 'moves communicates , by a conduit 60 opening into the part of this chamber where the pusher spring 40 'is located, with a leakage orifice 61 corresponding to the orifice Y of FIG. 1A provided with a calibrated valve 62 corresponding to that marked 51 in this figure 1A.
  • the shape and distribution of the orifices 28B and 28B ' can easily be optimized to obtain better progressiveness.

Landscapes

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

Claims (12)

  1. Hydraulische Schaltung mit einem an zwei Versorgungsleitungen (2, 3) angeschlossenen hydraulischen Verbraucher (1), einem Verteiler (6) für die Versorgung, durch welchen wahlweise die eine oder die andere Versorgungsleitung mit einer Druckquelle (4) oder einer Drucksenke (5) zu verbinden ist, und mit einem an einer der Versorgungsleitungen angeordneten Sicherheitsventil (15), welches:
    - eine mit dem Verteiler verbundene Einlaßöffnung (A, 20) und eine mit dem Verbraucher verbundene Aulaßöffnung (B, 21) hat;
    - zwischen der Einlaßöffnung (A, 20) und der Auslaßöffnung (B, 21) eine Rückschlageinheit (17; 26 - 32, 37 - 42) mit einem Rückschlagventil und einem steuerbaren Ventil (17) aufweist, welche eine Ruhestellung, in der das Rückschlagventil jeglichen Rückfluß von Fluid von der Auslaß- zur Einlaßöffnung verhindert, und eine aktive Stellung, in der ein solcher Rückfluß möglich ist, zuläßt, wobei eine Steueröffnung (Z, 22) vorgesehen ist, um das steuerbare Ventil mit einem Steuerdruck zu beaufschlagen, und
    - ein Überdruckventil (18, 34 - 36) aufweist, das zwischen die Auslaßöffnung (B, 21) und die Steueröffnung (Z, 22) gelegt ist und ab einem vorbestimmten Schwellenwert des Drucks einen Abfluß von der Auslaßöffnung zur Steueröffnung zuläßt,
    dadurch gekennzeichnet, daß die Steueröffnung (Z, 22) des Sicherheitsventils mit einer Steuerleitung (16) verbunden ist, die den Verteiler (6) mit einem hydraulischen Steuergerät (10) verbindet, welches ihn steuert.
  2. Hydraulische Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß zwischen der Steueröffnung (Z, 22) und dem Ausgang des Überdruckventils (18; 34 - 36) einerseits und dem steuerbaren Ventil (17) andererseits eine Düse (19, 22A) angeordnet ist.
  3. Hydraulische Schaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Steueröffnung (Z, 22) des Ventils mit einer Steueröffnung des Verteilers (6) verbunden ist.
  4. Hydraulische Schaltung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das steuerbare Ventil mit einem Abfluß (50, 60) versehen ist, der an einer Ausflußöffnung (Y, 61) endet, welche mit einer Gegendruckkammer (37') des steuerbaren Ventils (17; 38 - 40; 38' - 40) in Verbindung steht.
  5. Hydraulische Schaltung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das steuerbare Ventil in wenigstens einer Zwischenstellung einen Rückfluß ermöglicht mit einer Strömungsmenge, die kleiner ist als diejenige, welche in der aktiven Stellung des steuerbaren Ventils zugelassen ist, und somit eine einstellbare Strömungsmenge des Rückflusses gewährleistet.
  6. Hydraulische Schaltung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Rückschlagventil Teil des steuerbaren Ventils (17) ist.
  7. Hydraulische Schaltung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Rückschlagventil (26), unabhängig von dem steuerbaren Ventil, in einer Leitung liegt, die parallel zu derjenigen ist, in welcher das steuerbare Ventil angeordnet ist.
  8. Hydraulische Schaltung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das steuerbare Ventil eine verschiebliche Büchse aufweist, die einen zwischen der Einläßöffnung (20) und der Auslaßöffnung (21) angeordneten Schieber bildet, welcher eine Schließstellung und wenigstens eine Stellung zuläßt, in der Öffnungen (28A, 28B, 28B') eine Strömung zwischen den Ein- und Auslaßöffnungen erlauben, wobei die Bewegung des Schiebers durch einen Stößel (38, 39) steuerbar ist, der mit einem einer elastischen Rückstellkraft entgegengerichteten Steuerdruck beaufschlagbar ist.
  9. Hydraulische Schaltung nach Anspruch 8, dadurch gekennzeichnet, daß der Schieber (28) ein Druckausgleichsventil (32) aufweist, welches vor einer Verschiebung des Schiebers durch den Stößel gegen den Druck in der Auslaßöffnung zu öffnen ist.
  10. Hydraulische Schaltung nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Stößel (38, 39) beweglich koaxial im Schieber gelagert ist.
  11. Hydraulische Schaltung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß der Stößel eine Stange aufweist, in die ein Druckausgleichskanal (43) eingearbeitet ist, durch den getrennte Kammern (27, 42) in Verbindung zu bringen sind, in welche sich die Enden der Stange erstrecken.
  12. Hydraulische Schaltung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß das Sicherheitsventil (15, 15') am Verbraucher angebracht ist.
EP89400508A 1988-02-25 1989-02-23 Hydraulischer Kreislauf mit zugehörigem Sicherheitsventil für hydraulische Verbraucher Expired - Lifetime EP0330575B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89400508T ATE88548T1 (de) 1988-02-25 1989-02-23 Hydraulischer kreislauf mit zugehoerigem sicherheitsventil fuer hydraulische verbraucher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8802289A FR2627838B1 (fr) 1988-02-25 1988-02-25 Valve de securite pour recepteur hydraulique et circuit hydraulique la comportant
FR8802289 1988-02-25

Publications (2)

Publication Number Publication Date
EP0330575A1 EP0330575A1 (de) 1989-08-30
EP0330575B1 true EP0330575B1 (de) 1993-04-21

Family

ID=9363611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400508A Expired - Lifetime EP0330575B1 (de) 1988-02-25 1989-02-23 Hydraulischer Kreislauf mit zugehörigem Sicherheitsventil für hydraulische Verbraucher

Country Status (6)

Country Link
US (1) US4936032A (de)
EP (1) EP0330575B1 (de)
JP (1) JPH0231085A (de)
AT (1) ATE88548T1 (de)
DE (1) DE68906056T2 (de)
FR (1) FR2627838B1 (de)

Families Citing this family (19)

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Publication number Priority date Publication date Assignee Title
JPH0457637A (ja) * 1990-06-22 1992-02-25 Kosumetsuku:Kk 残圧保持機能付き圧油給排回路及びその圧油給排回路に用いる残圧保持用弁装置
JPH0473410A (ja) * 1990-07-13 1992-03-09 Kosumetsuku:Kk 残圧保持機能付き圧油給排回路及びその圧油給排回路に用いる残圧保持用弁装置
US5203668A (en) * 1991-06-06 1993-04-20 E. Fisher Apparatus for loading and unloading of a container structure or other loads with respect to a truck body or trailer
AT396613B (de) * 1992-05-15 1993-10-25 Hoerbiger Fluidtechnik Gmbh Hydraulische betätigungsanordnung für ein fahrzeugverdeck
DE4231189A1 (de) * 1992-09-17 1994-03-24 Rexroth Mannesmann Gmbh Sicherheitsschaltung für ein servohydraulisches Regelsystem
US5331882A (en) * 1993-04-05 1994-07-26 Deere & Company Control valve system with float valve
DE4312644C2 (de) * 1993-04-19 1996-01-25 Rexroth Mannesmann Gmbh Steuerung für einen hydraulischen Verbraucher
DE4406669C2 (de) * 1994-03-01 1997-01-30 Rexroth Mannesmann Gmbh Servohydraulisches Regelsystem
DE19804398A1 (de) * 1998-02-04 1999-08-05 Linde Ag Ventilanordnung für die Arbeitshydraulik eines Arbeitsfahrzeugs
DE10254605B4 (de) * 2002-11-22 2012-08-09 Linde Material Handling Gmbh Steuerventileinrichtung
DE10336684A1 (de) * 2003-08-09 2005-03-03 Deere & Company, Moline Hydraulische Steueranordnung für eine mobile Arbeitsmaschine
KR100956999B1 (ko) * 2007-12-10 2010-05-11 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 외부 파일럿 작동형 홀딩밸브를 갖는 유압회로
US20110308004A1 (en) * 2010-12-16 2011-12-22 Hamidreza Khorsandraftar Security system for artificial water bodies
CN102588366B (zh) * 2011-01-13 2015-09-16 斗山工程机械（中国）有限公司 一种工程机械及其前部工作装置的锁定阀
DE102011014685A1 (de) * 2011-03-22 2012-09-27 Linde Material Handling Gmbh Hydraulische Steuerventileinrichtung
CN103423226B (zh) * 2013-08-21 2016-02-24 常德中联重科液压有限公司 换向阀组件及包括该换向阀组件的液压系统
US20140165281A1 (en) * 2014-02-19 2014-06-19 Hamidreza Khorsandraftar Security system for artificial water bodies
US11241780B2 (en) 2017-12-07 2022-02-08 Maxell Izumi Co., Ltd. Electric tool
IT201800007591A1 (it) 2018-07-27 2020-01-27 Atlantic Fluid Tech Srl Dispositivo per Controllare un Attuatore

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244275A (en) * 1979-01-15 1981-01-13 Abex Corporation Counterbalance valve
US4655039A (en) * 1985-06-20 1987-04-07 The Raymond Corporation Lift system

Also Published As

Publication number Publication date
DE68906056D1 (de) 1993-05-27
FR2627838B1 (fr) 1991-01-11
FR2627838A1 (fr) 1989-09-01
ATE88548T1 (de) 1993-05-15
EP0330575A1 (de) 1989-08-30
DE68906056T2 (de) 1994-01-20
US4936032A (en) 1990-06-26
JPH0231085A (ja) 1990-02-01

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