EP2541071A2 - Agencement de soupapes pour un système de commande hydraulique - Google Patents

Agencement de soupapes pour un système de commande hydraulique Download PDF

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Publication number
EP2541071A2
EP2541071A2 EP12004137A EP12004137A EP2541071A2 EP 2541071 A2 EP2541071 A2 EP 2541071A2 EP 12004137 A EP12004137 A EP 12004137A EP 12004137 A EP12004137 A EP 12004137A EP 2541071 A2 EP2541071 A2 EP 2541071A2
Authority
EP
European Patent Office
Prior art keywords
connection
valve
port
consumer
pressure
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
EP12004137A
Other languages
German (de)
English (en)
Other versions
EP2541071A3 (fr
EP2541071B1 (fr
Inventor
Michael Dipl.-Ing. Deeken
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.)
Liebherr Machines Bulle SA
Original Assignee
Liebherr Machines Bulle 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
Priority claimed from CH01393/11A external-priority patent/CH705150A1/de
Application filed by Liebherr Machines Bulle SA filed Critical Liebherr Machines Bulle SA
Publication of EP2541071A2 publication Critical patent/EP2541071A2/fr
Publication of EP2541071A3 publication Critical patent/EP2541071A3/fr
Application granted granted Critical
Publication of EP2541071B1 publication Critical patent/EP2541071B1/fr
Not-in-force legal-status Critical Current
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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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
    • F15B2211/20592—Combinations of pumps for supplying high and low pressure
    • 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
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a return line
    • 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
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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 present invention relates to a valve assembly for a hydraulic control system for controlling a hydraulic consumer, having a pressure port for connection to a pressure supply, a tank port for connection to a return line, and two load ports for connection to the terminals of the hydraulic consumer.
  • valve assemblies are commonly used in hydraulic control systems to control the supply to and drain from a hydraulic consumer.
  • a 4/3-way proportional valve is usually used to control the movement of the hydraulic consumer in both directions.
  • the present invention shows a valve assembly for a hydraulic control system for driving a hydraulic consumer, with a pressure port for connection to a pressure supply, a tank port for connection to a return line, and two load ports for connection to the terminals of the hydraulic consumer. At least two separate valves are provided for controlling the connection of the two consumer connections with pressure connection and tank connection.
  • the valve assembly further comprises a valve for connection of pressure port and tank port.
  • valve according to the invention for connecting the pressure connection and the tank connection, an "open center" function is made possible, which connects the pressure connection and tank connection as long as there is no volumetric flow demand for the hydraulic consumer.
  • This allows a more flexible use of the invention Valve arrangement and improves the drive options. In particular, it is possible to connect several valve assemblies in series.
  • the system of resolved control edges also makes it possible to control the individual control edges separately from each other and / or to design or dimension different to adapt the cross sections and to minimize the flow losses.
  • valves for connection of pressure connection and tank connection are at least partially separately and optionally controlled differently.
  • valves for connecting the pressure connection and the tank connection, in particular differently dimensioned valves.
  • valve for connecting pressure port and tank port is designed as a separate valve.
  • the "open center" function is thus not integrated in the valves for connecting the two consumer connections with pressure connection and tank connection, but executed separately.
  • a 2/2-way valve can be used for the valve for connecting the pressure connection and tank connection.
  • the present invention is advantageously used for controlling hydraulic consumers with two directions of movement.
  • the valve arrangement is designed so that it can connect both consumer connections with the pressure connection or the tank connection, depending on the desired direction of movement.
  • the present invention is used in valve assemblies with resolved control edges, in which for connecting the first consumer terminal another valve is used with the pressure connection than for connecting the second consumer connection to the tank connection and / or wherein a second valve is used to connect the second consumer connection to the pressure connection than to connect the first consumer connection to the tank connection.
  • a different valve is used to connect the first consumer port to the pressure port than to connect the second consumer port to the pressure port and / or to connect the first consumer port to the tank port, a different valve is used to connect the second consumer port with the tank connection.
  • valves are used for all connections between the two consumer connections and pressure connection and tank connection, that is, a total of four valves for connecting the two consumer connections with pressure connection and tank connection.
  • 2/2-way valves can be used according to the invention for the valves for connecting the consumer connections with pressure connection and tank connection.
  • valves can be used to connect the consumer connections with pressure connection and tank connection. If a consumer is to be controlled with two directions of movement, two 3/3-way valves are advantageously used for this purpose.
  • the valve arrangement according to the invention comprises a control which closes the valve for connection of pressure port and tank port when the connection between one of the consumer ports and the pressure port is opened. Conversely, when all connections between one of the consumer ports and the pressure port are closed, the controller opens the pressure port and tank port connection valve. Furthermore, the controller can equally account for the connections between the load ports and the tank port.
  • the actuation of the valves of the valve arrangement according to the invention can be carried out both hydraulically, as well as electrically.
  • control of the valves for connection of the consumer connections with pressure connection and tank connection and / or the valve for connection of pressure connection and tank connection takes place hydraulically.
  • the valves for connection of the consumer connections with pressure connection and tank connection and / or the valve for connection of pressure connection and tank connection can be controlled in each case via a separate valve associated therewith.
  • a separate valve associated therewith for example, in each case a 3/3-way valve can be used.
  • the valves for connecting the consumer connections with pressure connection and tank connection are each controlled via a separate valve associated with them.
  • the valve for connection of pressure connection and tank connection is controlled via a separate valve associated with it.
  • valves for connecting the consumer connections with pressure connection and tank connection and / or the valve for connection of pressure connection and tank connection are at least partially controlled jointly.
  • valves for connection of the consumer connections with pressure connection and tank connection can be controlled at least partially together become.
  • control can take place via two separate valves, which each control a direction of movement of the hydraulic consumer.
  • valve for connection of pressure port and tank port is controlled together with the valves for connecting the load ports with pressure port and tank port.
  • valve arrangement can be designed so that the control terminal of the valve for connection of pressure connection and tank connection with one or more control lines for driving the valves for connecting the load ports with pressure port and tank port is in communication.
  • control connection of the valve for connecting the pressure connection and the tank connection is in this case connected to a plurality of control lines for activating the other valves, furthermore advantageously with all control lines.
  • the connection takes place via one or more check valves. In this way can be ensured by the hydraulic control that the valve for connection of pressure port and tank port opens when all other valves are closed, and closes when one of the other valves opens.
  • the present invention further includes a hydraulic control system having a valve assembly as described above.
  • the present invention includes a hydraulic system with a valve assembly or with a hydraulic control system as set forth above.
  • the hydraulic system advantageously comprises at least one hydraulic pump for providing a hydraulic pressure at the pressure connection of the valve arrangement, and a return line for connection to the tank connection of the valve arrangement.
  • the hydraulic system according to the invention comprises a consumer whose inlet and outlet are connected to the two load ports of the valve assembly.
  • valve assembly according to the invention is used with a consumer with two directions of movement.
  • the consumer may be in particular a translational or rotary consumer.
  • the hydraulic consumer may be a hydraulic cylinder or a hydraulic motor.
  • the hydraulic control system may comprise a further valve arrangement, which is connected in series with the valve arrangement according to the invention.
  • a further valve arrangement which is connected in series with the valve arrangement according to the invention.
  • valve arrangement is also a valve arrangement according to the invention with dissolved control edges and a valve for connecting the pressure connection and the tank connection.
  • it may also be a conventional valve.
  • the present invention further includes an implement having a hydraulic system as described above.
  • it may be a movable working device.
  • the implement according to the invention may be an earthmoving device, a handling device and / or a crane.
  • the inventive hydraulic control system is used to control a working equipment of the implement.
  • a hydraulic cylinder or a hydraulic motor of the working equipment For example, a hydraulic cylinder for lifting a boom or hydraulic motor for driving a slewing gear or a winch can be controlled.
  • the present invention further includes a method of operating a hydraulic system as set forth above.
  • the valve is closed to connect pressure port and tank port, when the connection between one of the consumer ports and the pressure port is opened.
  • the operation of the hydraulic system takes place here as already described above with regard to the valve arrangement according to the invention.
  • the present invention enables a particularly efficient distribution of the volume flows to a consumer.
  • resolved control edges are used.
  • an "open center” function is integrated with another seat valve.
  • the invention can thus minimize the pressure losses of the returns of the consumer.
  • different size seat valves for the inlet and the outlet of the hydraulic consumer can be used for this purpose. Simultaneously with the opening of the orifice to the inlet, the "open center" orifice closes to restrict the volume flow.
  • the inlet and outlet control edges are not carried out as usual as 4/3-way valve, but as a single control edges in the form of 2/2-way valves. This results in a number of four 2/2-way valves, two each for the two consumer connections A and B, that is for each of the consumer connections each a valve for the inlet and a valve for the flow.
  • the "open center” function is implemented via an additional 2/2-way valve, which is closed at a volumetric flow demand of the hydraulic consumer. This makes it possible to connect valve sections in series.
  • the system of dissolved control edges makes it possible to use different valves and / or to control inlet and outlet edges or directions of movement of the hydraulic consumer separately from each other. As a result, the cross sections can be adapted and flow losses can be minimized.
  • valve assemblies according to the invention serve to control a hydraulic load 11.
  • this is a hydraulic cylinder.
  • a hydraulic motor could also be activated.
  • the hydraulic consumer 11 has two connections, which form the inlet or outlet depending on the direction of movement. Furthermore, a hydraulic pump 10 is provided, which provides hydraulic pressure for operating the hydraulic consumer 11, as well as a tank 12, to which hydraulic fluid can flow back.
  • the valve arrangement according to the invention now has two consumer ports A and B for connection to the terminals of the hydraulic consumer 11, a pressure port P for connection to the hydraulic pump 12 and a tank port T for connection to a return line leading to the tank.
  • the individual connections can also be designed in the form of a plurality of connections connected in parallel.
  • valve assembly is a valve assembly with dissolved control edges, so that the two consumer terminals A and B and both directions of movement of the consumer via separate valves and thus not mechanically interconnected control edges are controlled.
  • valves 1 to 4 are present in the embodiment, wherein valve 1, the pressure port P to the first consumer port A, valve 2, the tank port T with the first consumer port A, valve 3, the pressure port P to the second consumer port B and valve 4, the tank port T. connects to the second consumer terminal B.
  • 2/2-way valves are used as valves.
  • valves for controlling the two load ports could also be an arrangement with only two separate valves are used. In such an arrangement, either the two consumer connections could then be controlled separately, or the two directions of movement of the hydraulic consumer. For example, two 3/3-way valves could be used for this purpose.
  • valves for controlling the two consumer connections or directions of movement allows for a separate and possibly different control of the valves, and on the other hand, the use of different sized valves. These two options can be used both individually and combined to adapt to the particular application and thus to reduce losses.
  • valve or the valves which connect or connect the first consumer connection A to the pressure connection P and the tank connection T can be designed differently from the valve or the valves connecting the second consumer connection B to the tank connection T and the pressure connection P . connect.
  • different valve cross sections can be used.
  • the valve or valves which actuate a first direction of movement of the hydraulic consumer be designed differently from the valve or valves which actuate a second direction of movement.
  • valve 5 which connects the pressure port P to the tank port T.
  • the valve 5 is designed as a separate valve to the other valves. As a result, there is a further separate control edge, via which a direct connection between the pressure connection and the tank connection can be established.
  • valve 5 an "open center” function can be realized, which connects pressure port and tank connection with each other when the two consumer ports are disconnected from the pressure port and vice versa.
  • a corresponding control is provided for this purpose.
  • the controller is designed so that the valve 5 closes when one of the valves for connecting the pressure port opens with one of the two load ports, so as to throttle the flow.
  • valves 1 to 5 are hydraulically controlled.
  • a hydraulic pump 13 is provided in each case, which provides the control pressure required for this purpose.
  • a separate control valve SV1 to SV5 is provided for each of the valves 1 to 5.
  • a control valve while 3/3-way valves are used.
  • the control valves SV1 to SV5 can be electrically controlled, for example.
  • control valves SV1 to SV5 can also be integrated in the valves 1 to 5, so that in each case two-stage valves are used.
  • control valve SV1 'and SV2' are used to control the valves 1 to 5.
  • the control valve SV1 ' controls the valves 1 and 4, that is, the connection of the first consumer port A to the pressure port and the connection of the second consumer port B to the tank port.
  • the second control valve SV2 ' controls, however, the valves 2 and 3, that is, the connection of the second consumer port to the pressure port and the connection of the first consumer port to the tank port.
  • the first control valve SV1 'thus controls the first direction of movement, in which the terminal A of the consumer is pressurized, while hydraulic fluid from the second terminal B flows.
  • the control valve SV2 ' controls the opposite direction.
  • the control valves SV1 'and SV2' for controlling the valves 1 to 4 are now also used to control the valve 5 to connect the pressure port and tank port.
  • the control terminal of the valve 5 via check valves 16 with the control lines for controlling the valves 1 to 4 in connection.
  • the check valves 16 ensure that the respective highest control pressure is applied to the control terminal of the valve 5. The valve 5 is thereby automatically closed when one of the valves 1 to 4 is opened.
  • a corresponding control of the valve 5 for the connection of pressure connection and tank connection would also be in the in FIG. 1 embodiment shown conceivable by dispensing with the control valve SV5 and the control terminal of the valve 5 is connected via check valves to the control lines for the valves 1 to 4.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Housings (AREA)
EP12004137.1A 2011-06-30 2012-05-29 Agencement de soupapes pour un système de commande hydraulique Not-in-force EP2541071B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011106081 2011-06-30
CH01393/11A CH705150A1 (de) 2011-06-30 2011-08-25 Ventilanordnung für ein hydraulisches Steuerungssystem.

Publications (3)

Publication Number Publication Date
EP2541071A2 true EP2541071A2 (fr) 2013-01-02
EP2541071A3 EP2541071A3 (fr) 2016-12-07
EP2541071B1 EP2541071B1 (fr) 2020-11-11

Family

ID=46245447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12004137.1A Not-in-force EP2541071B1 (fr) 2011-06-30 2012-05-29 Agencement de soupapes pour un système de commande hydraulique

Country Status (1)

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EP (1) EP2541071B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987036A (zh) * 2015-02-05 2016-10-05 徐工集团工程机械股份有限公司 支腿控制组合阀、液压系统及起重机
US20230142326A1 (en) * 2021-11-08 2023-05-11 Pdc Machines, Inc. High-throughput diaphragm compressor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3411536A (en) * 1966-07-06 1968-11-19 Koehring Co Pilot operated control valve mechanism
US4723576A (en) * 1985-06-24 1988-02-09 Fluidcircuit Technologies, Inc. Fluid power control system
DE19500749C2 (de) * 1995-01-12 2000-12-07 Danfoss As Drei- oder Mehr-Wege-Ventil
US6467264B1 (en) * 2001-05-02 2002-10-22 Husco International, Inc. Hydraulic circuit with a return line metering valve and method of operation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987036A (zh) * 2015-02-05 2016-10-05 徐工集团工程机械股份有限公司 支腿控制组合阀、液压系统及起重机
US20230142326A1 (en) * 2021-11-08 2023-05-11 Pdc Machines, Inc. High-throughput diaphragm compressor

Also Published As

Publication number Publication date
EP2541071A3 (fr) 2016-12-07
EP2541071B1 (fr) 2020-11-11

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