EP1193211A2 - Dispositif de levage hydraulique - Google Patents

Dispositif de levage hydraulique Download PDF

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Publication number
EP1193211A2
EP1193211A2 EP01122968A EP01122968A EP1193211A2 EP 1193211 A2 EP1193211 A2 EP 1193211A2 EP 01122968 A EP01122968 A EP 01122968A EP 01122968 A EP01122968 A EP 01122968A EP 1193211 A2 EP1193211 A2 EP 1193211A2
Authority
EP
European Patent Office
Prior art keywords
lowering
valve
lifting device
hydraulic lifting
speed
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
EP01122968A
Other languages
German (de)
English (en)
Other versions
EP1193211A3 (fr
EP1193211B1 (fr
Inventor
Ralf Mebert
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.)
Still Wagner GmbH and Co KG
Original Assignee
Still Wagner GmbH and Co KG
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 Still Wagner GmbH and Co KG filed Critical Still Wagner GmbH and Co KG
Publication of EP1193211A2 publication Critical patent/EP1193211A2/fr
Publication of EP1193211A3 publication Critical patent/EP1193211A3/fr
Application granted granted Critical
Publication of EP1193211B1 publication Critical patent/EP1193211B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • 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
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
    • F15B2211/40569—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged downstream of the flow control means
    • 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
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the 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
    • F15B2211/70—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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • 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
    • F15B2211/75—Control of speed of the output member

Definitions

  • the invention relates to a hydraulic lifting device for a battery-electric operated machine, in particular industrial truck, the lifting device has a vertically movable load suspension device, which is equipped with at least one hydraulic lifting cylinder is operatively connected, the lifting cylinder by means of a Pressure medium line with one in the lifting operation as a pump and in the lower operation as Engine working hydraulic unit is connected to the one in the Lifting operation as a motor and lowering operation as a generator working electrical
  • the machine is in a driving connection.
  • Raising the vertically movable load suspension means is carried out by means of at least one Lift cylinder, which is connected to the hydraulic unit, which is in lifting operation works as a pump, conveys pressure medium to the lifting cylinder and from it as a motor working electrical machine is driven.
  • the hydraulic unit which is in lifting operation works as a pump
  • a generator working electrical machine drives.
  • This allows the lowering of the Load suspension means recovered potential energy of the load by the potential energy from the electrical working as a generator Machine is converted into electrical energy and fed into the battery.
  • the energy recovery during lowering results in a longer operating time a battery charge, which means that the truck can charge a higher battery charge Handling capacity.
  • Such a lifting device is known from EP 0 630 853 B1.
  • the regulation of Lowering speed of the load handler in lowering mode and Lifting speed of the load handler in lifting operation is via the entire working area by means of speed control of the electrical machine.
  • the signal from a setpoint specification device becomes a speed setpoint for the electrical machine formed.
  • the speed setpoint is determined using a speed sensor arranged on the electrical machine Actual speed value compared, the from the actual speed value and the Speed setpoint formed control deviation on a speed controller of the electrical Machine is given.
  • a lifting device in which a Proportional valve for controlling the lowering movement is provided.
  • the proportional valve in the In proportional operation in the fine control area, the proportional valve is in one Flow position. At high lowering speeds, the proportional valve is in opened a flow position. Both in the fine control area and at high The hydraulic unit is lowered from the lifting cylinder escaping pressure medium driven, thereby energy recovery is made possible.
  • the proportional valve is in the entire sink operation flows through, especially at high lowering speeds Proportional valve due to the high pressure medium flow a high pressure loss occurs.
  • the lowering speed in Fine control range can be set precisely by using the proportional valve
  • pressure loss occurring at high sink speeds is reduced the percentage of recoverable energy.
  • the present invention has for its object a lifting device to provide the type mentioned at the beginning, which in the fine control area low sink speeds an exact setting of the sink speed and effective energy recovery at high sink speeds allows.
  • the lowering movement is thus when lowering in the fine control range controlled by the lowering valve, the outflowing from the lifting cylinder Pressure medium flows to the tank via the lowering valve.
  • the lower valve is open due to the low pressure medium flows in the fine control range to design low volume flows and therefore has low construction costs and Space requirements.
  • the lowering valve is as Proportional valve designed and to control the lowering movement in the Fine control range can be applied to a flow position.
  • a Proportional valve can easily in the sink operation in the fine control range Lowering speed can be set accurately, taking the total Proportional range of the sink valve for controlling the sink movement in the Fine control range can be used.
  • the lowering valve can be reached when it is reached a limit lowering speed in the locked position.
  • the proportional valve is thus in a lowering speed Locked position, which prevents pressure medium from flowing out to the container and it is achieved that the pressure medium flowing out of the lifting cylinder via the as Motor-driven hydraulic unit flows and the one working as a generator drives electrical machine.
  • the lowering valve can Reached the lower limit speed in the flow position stay. At high lowering speeds, the proportional valve remains in the fully open flow position. This results in a simpler one control-related transition from lowering in the fine control area via the Proportional valve for regenerative lowering at high lowering speeds via the hydraulic unit. Due to the low pressure medium flow in the The branch line is the pressure medium flow flowing out of the tank to the Ratio to the pressure medium flow flowing to the hydraulic unit low, resulting in effective energy recovery at high Lowering speeds is achieved.
  • a Measuring device for detecting the speed of movement of the Load suspension device is provided.
  • moving the speed of the Measuring device that detects the load suspension device can be a simple Feedback signal to control the sink valve in sink operation in Fine control range or to control the electrical machine in sink operation high sink speeds as well as in lifting operation.
  • the measuring device is expediently designed as a displacement sensor.
  • the displacement sensor arranged on the lifting cylinder can easily Movement speed of the load handler can be detected.
  • the electrical machine can be designed as a DC machine. Special Advantages arise when the electrical machine as an asynchronous machine is trained. With an asynchronous machine there is one in the sink mode automatic feeding of electrical energy back into the battery, resulting in a low construction costs for the lifting device results.
  • a lifting device 1 is no longer for one shown truck.
  • the lifting device 1 has a hydraulic Unit 2 on that with an electrical machine 3, for example one DC or asynchronous machine, is in a driving connection.
  • the electrical Machine 3 is no longer used to supply electrical energy battery shown in operative connection.
  • the hydraulic unit 2 stands with a container 5 and a pressure medium line 6 in connection, which is guided to lifting cylinders 7. There is one on each of the lifting cylinders 7 Pipe rupture protection 8 arranged.
  • a load holding valve 10 is arranged in the pressure medium line 6.
  • the load holding valve 10 has a blocking position 10a designed as a seat valve and a flow position 10b on.
  • the load holding valve 10 is in the direction of the blocking position 10a by a spring 11 acted upon.
  • an actuating device 12 for example a Switching magnet, the load holding valve 10 can be loaded into the flow position 10b.
  • a sink valve 16 is arranged.
  • the lower valve 16 is as in Intermediate positions throttling proportional valve is formed and has a Seat valve formed blocking position 16a and a flow position 16b.
  • the lowering valve 16 is in the direction of the blocking position 16a by means of a spring 17 applied.
  • an actuating device 18 for example a Proportional magnets, the lowering valve 16 is in the direction of the flow position 16b acted upon.
  • a measuring device 20 for example a displacement sensor, is provided on the lifting cylinders 7 Detection of the speed of movement arranged.
  • the electric machine 3 is used for lifting in accordance with the specification Setpoint input device, such as a joystick, operated, which as Pump operated hydraulic unit 2 to achieve the predetermined Lifting speed provides the required amount of pressure medium.
  • Setpoint input device such as a joystick
  • Pump operated hydraulic unit 2 to achieve the predetermined Lifting speed provides the required amount of pressure medium.
  • the Measuring device 20 can provide a feedback signal for speed control electrical machine 3 are generated.
  • the electrical machine 3 can run at a predetermined minimum speed be operated, whereby when lifting in the fine control range of the as Pump working hydraulic unit 2 a the pressure medium requirement of Lift cylinder 7 exceeding pressure medium flow is promoted.
  • By activation of the lowering valve 16 in the flow position 16b can be done in a simple manner the pumped by the hydraulic unit 2 working as a pump Flow off excess pressure medium flow to tank 5. This will turn on allows simple way that the lifting cylinder 7 when lifting in the fine control range be operated at the specified lifting speed.
  • a setpoint is set by the setpoint Lowering speed of the load handler specified.
  • Pressure medium thus flows from the lifting cylinders 7 via the lowering valve 16 to a container in a flow position 16b.
  • the lowering speed is thus in the fine control range by the lowering valve 16 set, the entire proportional range of the sink valve 16 to Control of the sink movement is used in the fine control area.
  • the signal of the Measuring device 20 can be used as a feedback signal for controlling the Sink valve16 can be used.
  • the signal from the measuring device 20 can be used as a feedback signal Speed control of the electrical machine can be used.
  • the lowering valve 16 can move completely into the Flow position 16b can be controlled or acted upon in the blocking position 16 become.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP01122968A 2000-09-28 2001-09-25 Dispositif de levage hydraulique Expired - Lifetime EP1193211B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10048215 2000-09-28
DE10048215A DE10048215A1 (de) 2000-09-28 2000-09-28 Hydraulische Hubvorrichtung

Publications (3)

Publication Number Publication Date
EP1193211A2 true EP1193211A2 (fr) 2002-04-03
EP1193211A3 EP1193211A3 (fr) 2005-12-14
EP1193211B1 EP1193211B1 (fr) 2007-01-24

Family

ID=7658041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01122968A Expired - Lifetime EP1193211B1 (fr) 2000-09-28 2001-09-25 Dispositif de levage hydraulique

Country Status (3)

Country Link
EP (1) EP1193211B1 (fr)
AT (1) ATE352515T1 (fr)
DE (2) DE10048215A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1308415A2 (fr) * 2001-11-06 2003-05-07 Dambach Lagersysteme GmbH & Co. KG Dispositif de levage hydraulique en particulier pour chariots industriels alimentés par batterie et son procédé de commande
EP1369377A3 (fr) * 2002-06-05 2006-07-05 BT Industries Procédé de commande pour chariot élévateur
AT506448B1 (de) * 2008-02-29 2012-05-15 Metso Paper Inc Hydrauliksystem des belastungszylinders
EP2778113A1 (fr) * 2013-03-14 2014-09-17 The Raymond Corporation Système et procédé de régénération hydraulique pour véhicule de manutention de matériaux
US8924103B2 (en) 2011-02-16 2014-12-30 Crown Equipment Corporation Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
US9975426B2 (en) 2013-06-26 2018-05-22 Parker-Hannifin Manufacturing Limited Energy efficient electric vehicle control system
EP3348514A1 (fr) * 2017-01-17 2018-07-18 The Raymond Corporation Systèmes de décharge de pression hydraulique variable et procédés pour un véhicule de manutention de matériaux
CN108622805A (zh) * 2017-03-23 2018-10-09 雷蒙德股份有限公司 用于物料搬运车辆上桅杆稳定的系统和方法
WO2021004657A1 (fr) * 2019-07-08 2021-01-14 Eaton Intelligent Power Limited Architectures de système hydraulique et vannes proportionnelles bidirectionnelles utilisables dans les architectures de système

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3178778B1 (fr) 2015-12-10 2019-05-22 UniCarriers Europe AB Système hydraulique de régénération d'énergie et véhicule industriel avec ce système hydraulique
DE102019111295A1 (de) * 2019-05-02 2020-11-05 Jungheinrich Aktiengesellschaft Hydraulikanordnung für ein Flurförderzeug

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3018156A1 (de) * 1980-02-26 1981-09-03 Oil Drive Kogyo Ltd., Tokyo Hydraulische hebevorrichtung
EP0630853A1 (fr) * 1993-05-28 1994-12-28 Jungheinrich Aktiengesellschaft Equipement de levage hydraulique pour chariots de manutention mûs par batterie ou analogues
EP0908413A2 (fr) * 1997-10-08 1999-04-14 Still Wagner GmbH & Co. KG Chariot élévateur avec un dispositif de prise de la charge et procédé pour descendre le dispositif de prise de la charge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3018156A1 (de) * 1980-02-26 1981-09-03 Oil Drive Kogyo Ltd., Tokyo Hydraulische hebevorrichtung
EP0630853A1 (fr) * 1993-05-28 1994-12-28 Jungheinrich Aktiengesellschaft Equipement de levage hydraulique pour chariots de manutention mûs par batterie ou analogues
EP0908413A2 (fr) * 1997-10-08 1999-04-14 Still Wagner GmbH & Co. KG Chariot élévateur avec un dispositif de prise de la charge et procédé pour descendre le dispositif de prise de la charge

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1308415A3 (fr) * 2001-11-06 2005-05-25 Dambach Lagersysteme GmbH & Co. KG Dispositif de levage hydraulique en particulier pour chariots industriels alimentés par batterie et son procédé de commande
EP1308415A2 (fr) * 2001-11-06 2003-05-07 Dambach Lagersysteme GmbH & Co. KG Dispositif de levage hydraulique en particulier pour chariots industriels alimentés par batterie et son procédé de commande
EP1369377A3 (fr) * 2002-06-05 2006-07-05 BT Industries Procédé de commande pour chariot élévateur
AT506448B1 (de) * 2008-02-29 2012-05-15 Metso Paper Inc Hydrauliksystem des belastungszylinders
US9394151B2 (en) 2011-02-16 2016-07-19 Crown Equipment Corporation Materials handling vehicle monitoring a pressure of hydraulic fluid within a hydraulic structure
US9751740B2 (en) 2011-02-16 2017-09-05 Crown Equipment Corporation Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
US8924103B2 (en) 2011-02-16 2014-12-30 Crown Equipment Corporation Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
US8935058B2 (en) 2011-02-16 2015-01-13 Crown Equipment Corporation Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
US9296598B2 (en) 2011-02-16 2016-03-29 Crown Equipment Corporation Materials handling vehicle measuring electric current flow into/out of a hydraulic system motor
CN104045028A (zh) * 2013-03-14 2014-09-17 雷蒙德股份有限公司 用于材料搬运车辆的液压再生系统和方法
US9360023B2 (en) 2013-03-14 2016-06-07 The Raymond Corporation Hydraulic regeneration system and method for a material handling vehicle
EP2778113A1 (fr) * 2013-03-14 2014-09-17 The Raymond Corporation Système et procédé de régénération hydraulique pour véhicule de manutention de matériaux
CN104045028B (zh) * 2013-03-14 2017-12-12 雷蒙德股份有限公司 用于材料搬运车辆的液压系统和方法
US9975426B2 (en) 2013-06-26 2018-05-22 Parker-Hannifin Manufacturing Limited Energy efficient electric vehicle control system
EP3348514A1 (fr) * 2017-01-17 2018-07-18 The Raymond Corporation Systèmes de décharge de pression hydraulique variable et procédés pour un véhicule de manutention de matériaux
US10844880B2 (en) 2017-01-17 2020-11-24 The Raymond Corporation Variable hydraulic pressure relief systems and methods for a material handling vehicle
US11118607B2 (en) 2017-01-17 2021-09-14 The Raymond Corporation Variable hydraulic pressure relief systems and methods for a material handling vehicle
CN108622805A (zh) * 2017-03-23 2018-10-09 雷蒙德股份有限公司 用于物料搬运车辆上桅杆稳定的系统和方法
US10604391B2 (en) * 2017-03-23 2020-03-31 The Raymond Corporation Systems and methods for mast stabilization on a material handling vehicle
CN108622805B (zh) * 2017-03-23 2021-06-25 雷蒙德股份有限公司 用于物料搬运车辆上桅杆稳定的系统和方法
AU2018202033B2 (en) * 2017-03-23 2023-06-01 The Raymond Corporation Systems and methods for mast stabilization on a material handling vehicle
WO2021004657A1 (fr) * 2019-07-08 2021-01-14 Eaton Intelligent Power Limited Architectures de système hydraulique et vannes proportionnelles bidirectionnelles utilisables dans les architectures de système

Also Published As

Publication number Publication date
DE10048215A1 (de) 2002-04-11
EP1193211A3 (fr) 2005-12-14
ATE352515T1 (de) 2007-02-15
DE50111941D1 (de) 2007-03-15
EP1193211B1 (fr) 2007-01-24

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