EP3680493A1 - Agencement de circuit - Google Patents

Agencement de circuit Download PDF

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Publication number
EP3680493A1
EP3680493A1 EP19218530.4A EP19218530A EP3680493A1 EP 3680493 A1 EP3680493 A1 EP 3680493A1 EP 19218530 A EP19218530 A EP 19218530A EP 3680493 A1 EP3680493 A1 EP 3680493A1
Authority
EP
European Patent Office
Prior art keywords
working device
valve
circuit arrangement
load
proportional
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
EP19218530.4A
Other languages
German (de)
English (en)
Other versions
EP3680493B1 (fr
Inventor
Peter Bruck
Markus Veit
Patrick Hans
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 Fluidtechnik GmbH
Original Assignee
Hydac Fluidtechnik 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 Fluidtechnik GmbH filed Critical Hydac Fluidtechnik GmbH
Publication of EP3680493A1 publication Critical patent/EP3680493A1/fr
Application granted granted Critical
Publication of EP3680493B1 publication Critical patent/EP3680493B1/fr
Active 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • 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
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • F15B2211/30505—Non-return valves, i.e. check 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
    • F15B2211/31558—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line having a single output member
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/353—Flow control by regulating means in return line, i.e. meter-out control
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • F15B2211/7052—Single-acting output members
    • 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
    • F15B2211/76—Control of force or torque of the output member
    • F15B2211/761—Control of a negative load, i.e. of a load generating hydraulic energy

Definitions

  • the invention relates to a circuit arrangement for load pressure-optimized lowering of loads by means of a fluidically drivable working device, in particular in the form of at least one hydraulic working cylinder, which can be supplied by a motor-pump unit with a fluid that can be predetermined by a fluid in the inlet for lifting the respective load, and with a return flow Removal of fluid from the working device when lowering this load, into which a proportional valve is connected.
  • Circuit arrangements of this type are state of the art and are preferably used in industrial trucks for controlling working cylinders in the form of lifting cylinders for lifting devices, such as lifting forks, for lifting loads.
  • the lowering of raised loads caused by gravity takes place via electromagnetically actuated lowering valves which are arranged in the fluid return and can be controlled by input commands from an operator.
  • the known circuit arrangements have, in addition to a main lowering valve blocking or releasing the return, a proportional flow control valve as the second lowering valve, via which the operator can set the lowering speed.
  • the known circuit arrangement in the inlet has a lowering via the pump-preventing check valve and a pressure relief valve which secures the arrangement against impermissible overpressure and the lifting prevents heavy loads.
  • the arrangement of two lowering valves, the main lowering valve and the proportional valve provides redundancy which prevents the load from falling if one of the lowering valves fails, the known circuit arrangement is relatively complex in construction due to the presence of a total of four valves.
  • the object of the invention is to provide a circuit arrangement of the type mentioned at the outset which, while retaining the advantages, such as redundancy, of the known circuit arrangement is distinguished by a simpler and more cost-effective design.
  • a proportional pressure relief valve is switched into the return, which performs a double function by serving as a pressure relief valve or as a proportional valve when the load is raised and lowered by means of the hydraulic working device.
  • the dual function of the proportional pressure relief valve which on the one hand limits the load pressure prevailing in the inflow to a permissible pressure when the load is lifted and on the other hand serves as a proportionally operating lowering valve when lowering the load, enables a valve to be saved and a corresponding cost saving to be achieved in the circuit arrangement according to the invention.
  • the proportional behavior enables sensitive, load-independent lowering.
  • the proportional pressure relief valve can be controlled electromagnetically and receives its electrical setpoint specification from a controller in which a characteristic field for this proportional pressure relief valve is stored.
  • the arrangement is advantageously such that the controller receives sensor data for further processing as input variables in the form of the current fluid pressure of the working device as a function of its state of motion and in the form of the distance traveled as a function of the position of the hydraulic working device or in the form of the movement speed this work facility.
  • the values for the energization of the proportional pressure relief valve can be determined for loads of different weights and the resulting load pressures, in which the return flow rate has the desired characteristic curve and thus results in the desired lowering speed.
  • the distance or the speed is advantageously recorded on the hydraulic working device via a distance measuring or speed measuring system, and the current fluid pressure is recorded by a pressure sensor in the immediate inflow of the working device.
  • control For the selection of the working speed when operating the respective working device, such as the lifting cylinder, the control processes control inputs of an operator as a further input variable.
  • the return line with the proportional pressure relief valve opens into a connection point in the inlet, and a check valve, in particular in the form of a 2/2-way check valve, is connected between the connection point and the working device.
  • a check valve in particular in the form of a 2/2-way check valve
  • a shut-off valve is connected between the connection point and a pressure supply connection for the working device. This arrangement achieves redundancy both in the inlet and in the outlet.
  • a check valve is connected between the motor-pump unit and the connection point, which opens in the direction of the working device.
  • the invention also relates to a method for operating the circuit arrangement according to one of Claims 1 to 8, the method having the features of Claim 9.
  • circuit arrangement 2 of the prior art has for the connection of a fluidically drivable, not shown
  • Working device such as a lifting cylinder of an industrial truck
  • a pressure supply connection designated P which, when the circuit arrangement is used, is directly connected, for example, to the piston-side working space of the relevant lifting cylinder, not shown.
  • the arrangement 2 has a motor-pump unit 4 that can be driven by an electric motor, the hydraulic pump 6 of which is connected with its suction side to a fluid storage tank 10 via a suction filter 8.
  • the pressure side of the hydraulic pump 6 is connected to the supply connection P via an inlet line 12.
  • a check valve 14 is arranged in the feed line 12, which opens in the direction of the pressure supply connection P and prevents a backflow caused by the load pressure at the pressure supply connection P via the pump 6 when the motor-pump unit 4 is stopped, and thus a raised load is lowered via the Pump 6 prevented.
  • a return line 18, which leads to the tank 10 is connected to a connection point 16 of the inlet line 12 located between the check valve 14 and the pressure supply connection P.
  • a pressure relief valve 20 is also connected to the inlet line 12, which secures the inlet line 12 to the return line 18 and thus to the tank 10 against inadmissible overpressure and thereby also forms a safeguard against lifting heavy loads.
  • shut-off valve 22 in the form of an electromagnetically actuable 2/2-way valve, which blocks or releases the return line 18 as the main lowering valve.
  • a proportional control valve 24 is connected in the return line 18 as the second lowering valve.
  • a slider or seat version for controlling the electromagnetically actuated proportional control valve 24 Electrical control unit receives a pressure signal from a pressure transmitter 26, which corresponds to the load pressure of a respective load, which has been raised by previously switching on the motor-pump unit 4 and is to be lowered after the pump 6 is stopped.
  • Fig. 2 which shows an embodiment of the circuit arrangement according to the invention are elements which are those of Fig. 1 correspond functionally, designated by the same reference numerals. The relevant elements are for the solution according to the invention according to the Fig. 2 associated.
  • an inlet line 12 leading to the pressure supply valve P is connected to the pressure side of the hydraulic pump 6 of a motor pump unit 4, the suction side of which is connected to the fluid storage tank 10 via a suction filter 8.
  • the work facility to be supplied is in Fig. 2 a lifting cylinder 28 is shown, the piston-side working space 30 is directly connected to the pressure supply port P.
  • the Fig. 2 also shows the in Fig. 1 Not shown, designated 32 electrical control unit.
  • the latter receives a load pressure signal from the pressure transmitter 26 connected to the pressure supply connection P.
  • the control unit receives a displacement signal from a displacement measuring system 34 provided on the lifting cylinder 28, which represents the piston position of the lifting cylinder 28.
  • the check valve 22 is turned on in the inlet line 12 in an area 36 which is between the Connection point 16, at which the return line 18 branches off, and the pressure supply connection P is located.
  • the check valve 22 thus not only forms the main lowering valve, but also an element that controls the inflow.
  • the line section 36 of the inlet line 12, which is located between the shut-off valve 22 and the connection point 16 forms the first part of the return line 18, the second section of which connects to the connection point 16 and leads to the tank 10 for the lowering process.
  • a proportional pressure relief valve 38 In the part connected to the connection point 16 there is a proportional pressure relief valve 38. When the load is lifted, it secures the inlet line 12 in the same way as the pressure relief valve 20 of the known arrangement of FIG Fig. 1 against inadmissible excess pressure.
  • a proportional acting, electromagnetically actuated valve it also performs the control function of the proportional valve 24 of the known arrangement in a double function.
  • loads are lifted as in the prior art by operating the hydraulic pump 6.
  • the operator For lowering after the pump 6 has been stopped, the operator enters the desired lowering speed into the control unit 32 via an input button as a setpoint specification.
  • the control unit 32 calculates a setpoint specification for the control of the electromagnetically actuated proportional pressure relief valve 38 after the controller module has been inserted and the software has been parameterized, the proportional pressure relief valve 38 is opened more or less.
  • valve 38 is closed more tightly when the lowering speed is too high and opened more when the speed is too low. With different loads, this is due to the operator's speed input and is independent of the severity the lowering speed of the respective load can be regulated sensitively and continuously. If two valves are arranged in the return line, the shut-off valve 22 and the proportional pressure relief valve 38, the redundancy in the return line 18 is retained, so that even if one valve 22, 38 fails, the load is secured against falling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP19218530.4A 2019-01-12 2019-12-20 Agencement de circuit Active EP3680493B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019000212.1A DE102019000212A1 (de) 2019-01-12 2019-01-12 Schaltungsanordnung

Publications (2)

Publication Number Publication Date
EP3680493A1 true EP3680493A1 (fr) 2020-07-15
EP3680493B1 EP3680493B1 (fr) 2022-10-12

Family

ID=69156161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19218530.4A Active EP3680493B1 (fr) 2019-01-12 2019-12-20 Agencement de circuit

Country Status (2)

Country Link
EP (1) EP3680493B1 (fr)
DE (1) DE102019000212A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020007053A1 (de) 2020-11-19 2022-05-19 Hydac Fluidtechnik Gmbh Prüfvorrichtung
DE102021003236A1 (de) 2021-06-23 2022-12-29 Hydac Fluidtechnik Gmbh Verfahren zum Anpassen einer Ansteuerung eines Proportionalventils an seinen funktionsgemäßen Betrieb als Teil eines Fluidsystems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873817A (en) * 1988-08-01 1989-10-17 United Technologies Automotive, Inc. Electrically controlled pressure relief valve system and method
DE102007040877A1 (de) * 2007-08-29 2009-03-05 Robert Bosch Gmbh Hubwerk und Verfahren zum Ansteuern eines Hubwerkes
EP2524585A2 (fr) * 2011-05-14 2012-11-21 Robert Bosch Gmbh Dispositif de levage
DE102012005432A1 (de) * 2012-03-17 2013-09-19 Jungheinrich Aktiengesellschaft Flurförderzeug mit mindestens einem Hubzylinder
DE102016205582A1 (de) * 2016-04-05 2017-10-05 Robert Bosch Gmbh Hydraulische Antriebsvorrichtung mit Regenerationsbetrieb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140409A1 (de) * 1991-12-07 1993-06-09 Robert Bosch Gmbh, 7000 Stuttgart, De Elektrohydraulische steuereinrichtung
DE102012011062A1 (de) * 2012-06-04 2013-12-05 Liebherr-France Sas Hydrauliksystem und Druckbegrenzungsventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873817A (en) * 1988-08-01 1989-10-17 United Technologies Automotive, Inc. Electrically controlled pressure relief valve system and method
DE102007040877A1 (de) * 2007-08-29 2009-03-05 Robert Bosch Gmbh Hubwerk und Verfahren zum Ansteuern eines Hubwerkes
EP2524585A2 (fr) * 2011-05-14 2012-11-21 Robert Bosch Gmbh Dispositif de levage
DE102012005432A1 (de) * 2012-03-17 2013-09-19 Jungheinrich Aktiengesellschaft Flurförderzeug mit mindestens einem Hubzylinder
DE102016205582A1 (de) * 2016-04-05 2017-10-05 Robert Bosch Gmbh Hydraulische Antriebsvorrichtung mit Regenerationsbetrieb

Also Published As

Publication number Publication date
EP3680493B1 (fr) 2022-10-12
DE102019000212A1 (de) 2020-07-16

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