EP0890030B1 - Circuit de securite - Google Patents

Circuit de securite Download PDF

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Publication number
EP0890030B1
EP0890030B1 EP97901050A EP97901050A EP0890030B1 EP 0890030 B1 EP0890030 B1 EP 0890030B1 EP 97901050 A EP97901050 A EP 97901050A EP 97901050 A EP97901050 A EP 97901050A EP 0890030 B1 EP0890030 B1 EP 0890030B1
Authority
EP
European Patent Office
Prior art keywords
safety
control
safety circuit
valve
drive part
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
EP97901050A
Other languages
German (de)
English (en)
Other versions
EP0890030A1 (fr
Inventor
Wolfgang Britz
Reiner Hans Hertzig
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.)
Hydac Technology GmbH
Original Assignee
Hydac Technology 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 Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP0890030A1 publication Critical patent/EP0890030A1/fr
Application granted granted Critical
Publication of EP0890030B1 publication Critical patent/EP0890030B1/fr
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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/16—Trip gear
    • F01D21/18—Trip gear involving hydraulic means

Definitions

  • the invention relates to a safety circuit with the features of the preamble of claim 1.
  • Hydraulic drives with two different directions of travel Movable drive part can, for example, from a hydraulic Differential or synchronous cylinders are formed, the working pistons as drive parts Carry out feed movements, for example a steam control valve to control or train this yourself.
  • the fluid or oil supply takes place usually via pressure accumulator, but also separately depending on the requirement arranged safety pressure accumulator can be used.
  • the steam valve can be moved to any valve position.
  • the steam control valve can be designed as a shut-off and control valve with Quick opening or quick closing priority as well as a so-called safety valve with quick opening priority.
  • the priorities mentioned play in particular then a role if the steam control valve is used in safety-relevant areas Use comes, for example, of power plant technology, whereby in emergency operation it must be ensured that the steam control valve can be predetermined definable end positions takes as soon as possible.
  • the known safety circuits such as it is disclosed for example for a hydraulic press by DE 36 31 104 A1 the relevant safety functions are often used by electronic circuits monitored and carried out, but prone to failure and failure are and therefore do not trigger the required switching process with absolute certainty.
  • GB-A-2 057 718 is a generic safety circuit for Actuation of a hydraulic drive with one in two different from each other Movement directions movable drive part known to any Method can be controlled by a control circuit in the form of a servo system, a safety circuit hydraulically superimposed on the control circuit is that when the same is turned off, the drive part exclusively from the respective safety circuit can be controlled.
  • the known one Safety circuit is particularly useful when driving rotor blades Helicopters used.
  • the triggering of the safety function is not defined by the Control of the switching valve of the control switching part via the safety switching part, Rather, the switching valve is via a hydraulic pump of the safety circuit of the control circuit. The pressurized connection then comes to the hydraulic drive by means of the same hydraulic pump Safety switching part also controlled via this switching valve.
  • the invention is based on the object a safety circuit for controlling a hydraulic drive create that is immune to interference and a high level of security offers. This task is performed by a safety circuit with the characteristics of Claim 1 solved.
  • the first safety switching part controls the first switching valve to shut off the pressure-carrying connection and via at least one second switching valve the pressure-carrying connection to the manufactures hydraulic drive, a safety circuit is realized, which itself in the event of a power failure, the required safety function is fulfilled with absolute certainty.
  • the safety circuit is used to control a hydraulic drive 10, which is formed from an actuating cylinder with a double-acting piston Drive part 12, which can be moved back and forth on both sides, in particular in the viewing direction seen on the circuit, reciprocally movable piston rods up and down 14 has.
  • the hydraulic drive (actuating cylinder) 10 can act as a steam control valve trained to change free pipe opening cross-sections (not shown), fully release or close them, or the piston rods mentioned 14 can in turn act on further control valves (not shown).
  • the possible directions of travel of the drive part (piston) 12 are in the circuit with arrows and provided with the words "retract" and "extend” played.
  • Another hydraulic can be used instead of the actuating cylinder 10 Drive depending on the respective application, for example in the manner of a hydraulic motor (not shown).
  • the actuating cylinder 10 Via its connection points A and B, the actuating cylinder 10 is over corresponding fluid-carrying connecting lines with a hydraulic pump P 'and the tank T 'connectable. Depending on whether there is a pressure connection to the hydraulic pump P 'at port A or port B, the moves Piston 12 with its two piston rods 14 in the direction of view of the circuit diagram seen down or up.
  • the actuating cylinder 10 For the control of the relevant Movement is the actuating cylinder 10 to one designated as a whole by 16 hydraulic control block connected, as well as the hydraulic pump P 'and the tank T'.
  • the corresponding ones can be in particular towards the tank side Connecting lines can be provided with adjustable chokes 18.
  • the better Because of the illustration, not all of the fluid-carrying lines in control block 16 are Connection lines drawn with solid lines. Much more also represent the dotted and broken lines possible fluid-carrying connections.
  • the actual control function of the actuating cylinder 10, that is to say as a function of it from the system state essentially continuous Opening and closing procedures for the piston 12 take place via the 4/3-way valve (Control switching part) MV3 with the magnets Y3 and Y4.
  • the regulation mentioned is carried out by a 3-point step controller, can also be done by a pure impulse control or through a completely continuous control. In the case of complete continuous control is used instead of the slide valve shown a proportional or servo valve is used.
  • the 4/3-way valve MV3 is on the output side with its two connections A, B each to a first one Switching valve (cartridge valve) LERA and LERB connected.
  • the two control connections X of the first switching valves LERA and LERB are via the shuttle valve W3 to the fluid-carrying outlet A of a first one Safety switching part (solenoid valve) MV1 of the safety circuit in the form a 4/2-way valve connected via the assigned magnet Y1 is excitable. Furthermore, a connecting line leads from the shuttle valve W3 to the fluid-carrying output B of a second safety switching part (Solenoid valve) MV2 in the form of a 4/2-way valve, which is above the magnet Y2 can be controlled.
  • the two solenoid valves MV1 and MV2 are in their de-energized, i.e. de-energized position in the circuit diagram.
  • the Magnet Y1 controls the solenoid valve MV1, it is excited and takes its Left switch position as seen in the direction of the circuit diagram.
  • the two control connections X of the cartridge valves LERA and LERB are also depressurized, with the result that the addressed Open the cartridge valves.
  • the actuating cylinder 10 is retracted or extended. The relevant control results from that above the Circuit diagram arranged overview table.
  • a defined or quick closing process should be carried out during the Adjusting cylinder 10 may be provided.
  • This is the top priority function via the two second switching valves (cartridge valves) LEPA and LETB.
  • LETB connects the chamber B of the cylinder to the tank connection T Control, whereas LEPA chamber A with the pressurized connection P of the control connects with the result that the piston 12 extends completely.
  • the cartridge valves are actuated in turn via the first safety switching part MV1.
  • the two control connections X of the cartridge valves LEPA and LETB are depressurized switched so that the cartridge valves LEPA and LETB to control the Actuating cylinder 10 can open.
  • the two control connections X of the first switching valves LERA and LERB now via Shuttle valve W3 pressurized with the result that the first switching valves LERA and LERB remain closed and the control function is bridged.
  • Another "quick open" switching function that can be achieved with the safety circuit takes place via the control of the second safety switching part MV2.
  • This function is enabled by energizing magnet Y1 Solenoid valve MV1.
  • solenoid Y2 of solenoid valve MV2 the assigned control connections X of the cartridge valves LETA and LEPB relieved and thus depressurized.
  • the LETA cartridge valve can then connect chamber A of the cylinder to the tank connection of the control and cartridge valve LEPB connects the chamber B of the actuating cylinder 10 with the connection P of the control.
  • the one at connection B of the solenoid valve MV2 Pending pump pressure brings the closing part of the shuttle valve W3 in its right-hand closed position and the fluid pressure in the control connections X the cartridge valves LERA and LERB are closed.
  • the control connections X of the cartridge valves LEPA and LETB under fluid pressure and the Cartridge valves LEPA and LETB remain closed.
  • the safety function can be reversed An opening process can also be triggered. Even in one in this case, the usual regulation and closing function would this highest priority can then be overlaid with safe execution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Combustion (AREA)
  • Air Bags (AREA)
  • Cookers (AREA)
  • Mechanical Operated Clutches (AREA)

Claims (7)

  1. Circuit de sécurité pour l'amorçage d'un entraínement (10) hydraulique comportant une partie d'entraínement (12) mobile dans au moins deux directions de déplacement différentes, qui peut être activée pour le déplacement quelconque par un circuit de réglage, au moins un circuit de sécurité (MV1, LEPA, LETB ; MV2, LETA, LEPB) étant superposé au plan hydraulique au circuit de réglage (MV3, LERA, LERB), qui présente une partie de commutation de réglage (MV3), dont les sorties (A,B) véhiculant du fluide sont raccordées chacune à une première soupape de commutation (LERA, LERB), qui établit ou ferme une liaison conduisant la pression avec la partie d'entraínement (12) et peut être activée à cet effet par une partie de commutation de sécurité (MV1) du circuit de sécurité, caractérisé en ce que, pour le déclenchement d'une fonction de sécurité par la partie d'entraínement (12), la première partie de commutation de sécurité (MV1) active la première soupape de commutation (LERA, LERB) pour le blocage de la liaison conduisant la pression et établit la liaison (P) conduisant la pression avec l'entraínement (10) hydraulique au moyen d'au moins une deuxième soupape de commutation (LEPA, LETB).
  2. Circuit de sécurité selon la revendication 1, caractérisé en ce qu'une deuxième partie de commutation de sécurité (MV2) du circuit de sécurité est présente, laquelle active conjointement avec la première partie de commutation de sécurité (MV1) au moins une troisième soupape de commutation (LETA, LEPB), qui établit la liaison conduisant la pression pour un déplacement, contraire à la première fonction de sécurité, de la partie d'entraínement (12).
  3. Circuit de sécurité selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que l'entraínement hydraulique (10) est un cylindre de commande, dont le piston avec double possibilité de sollicitation constitue la partie d'entraínement (12) et en ce que la partie de commutation de réglage (MV3) est une soupape à 4/3 voies ou contient une commande impulsionnelle.
  4. Circuit de sécurité selon la revendication 2 ou 3, caractérisé en ce que chaque soupape de sécurité (MV1, MV2) est une soupape à 4/2 voies qui occupe cette position de commutation dans l'état excité ou dans l'état hors tension.
  5. Circuit de sécurité selon l'une quelconque des revendications 2 à 4, caractérisé en ce que chaque soupape de commutation (LERA, LERB, LEPA, LETB, LETA, LEPB) est constituée d'une soupape à cartouche, dont le raccordement de commande (X) respectif agit conjointement avec au moins une sortie (A,B) d'au moins l'une des parties de commutation de sécurité (MV1, MV2).
  6. Circuit de sécurité selon la revendication 5, caractérisé en ce qu'au moins en partie des soupapes à deux voies (W1, W2, W3) sont insérées entre la sortie respective (A,B) de la partie de commutation de sécurité respective (MV1, MV2) et la soupape à cartouche.
  7. Circuit de sécurité selon l'une quelconque des revendications 4 à 6, caractérisé en ce que la première partie de commutation de sécurité (MV1) est hors tension pour une opération de fermeture rapide, en ce que la première partie de commutation de sécurité (MV1) et la deuxième partie de commutation de sécurité (MV2) sont excitées pour une opération d'ouverture rapide et en ce que la première partie de commutation de sécurité (MV1) agit conjointement avec la partie de commutation de réglage (MV3) dans chaque position de déplacement pour une ouverture et une fermeture régulées avec la partie d'entraínement (12).
EP97901050A 1996-04-06 1997-01-17 Circuit de securite Expired - Lifetime EP0890030B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19613848A DE19613848C2 (de) 1996-04-06 1996-04-06 Sicherheitsschaltung zum Ansteuern eines hydraulischen Antriebes
DE19613848 1996-04-06
PCT/EP1997/000189 WO1997038228A1 (fr) 1996-04-06 1997-01-17 Circuit de securite

Publications (2)

Publication Number Publication Date
EP0890030A1 EP0890030A1 (fr) 1999-01-13
EP0890030B1 true EP0890030B1 (fr) 2002-06-05

Family

ID=7790686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97901050A Expired - Lifetime EP0890030B1 (fr) 1996-04-06 1997-01-17 Circuit de securite

Country Status (8)

Country Link
EP (1) EP0890030B1 (fr)
JP (1) JP2000508409A (fr)
AT (1) ATE218677T1 (fr)
CZ (1) CZ259398A3 (fr)
DE (2) DE19613848C2 (fr)
DK (1) DK0890030T3 (fr)
SK (1) SK136898A3 (fr)
WO (1) WO1997038228A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10050542B4 (de) 2000-10-11 2004-11-04 Preh Gmbh Sicherheitsschaltung gegen eine unerwünschte Inbetriebnahme eines Montageautomaten insbesondere während des Einrichtbetriebes sowie Verfahren zum Zuschalten der Sicherheitsschaltung
DE10343088B4 (de) * 2003-09-17 2006-04-20 Liebherr-Aerospace Lindenberg Gmbh Verfahren zur Überprüfung eines Ventilblocks für einen Verbraucher mit zwei hydraulischen Versorgungssystemen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931533C2 (de) * 1979-08-03 1984-09-13 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Servosteuersystem
JPH063202B2 (ja) * 1986-04-27 1994-01-12 三菱重工業株式会社 電気油圧サ−ボアクチユエ−タの故障中立機構
DE3631104A1 (de) * 1986-09-12 1988-03-24 Rexroth Mannesmann Gmbh Sicherheitsschaltung, insbesondere fuer eine presse
DE4131821C1 (en) * 1991-09-20 1992-08-13 Mannesmann Ag, 4000 Duesseldorf, De Pressure medium safety circuit for boiler lid handling - has extra safety valve coupled to valve system for switching in dependence on pressure threshold value
US5577876A (en) * 1994-02-22 1996-11-26 Clark Equipment Company Hydraulic interblock system
JPH08113197A (ja) * 1994-10-17 1996-05-07 Kawasaki Heavy Ind Ltd 舵取機における油圧制御系統切換回路

Also Published As

Publication number Publication date
DE19613848C2 (de) 1998-04-09
DE19613848A1 (de) 1997-10-09
WO1997038228A1 (fr) 1997-10-16
CZ259398A3 (cs) 1998-11-11
SK136898A3 (en) 1999-02-11
DE59707427D1 (de) 2002-07-11
EP0890030A1 (fr) 1999-01-13
DK0890030T3 (da) 2002-09-23
JP2000508409A (ja) 2000-07-04
ATE218677T1 (de) 2002-06-15

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