EP1943179B1 - Hydraulikanlage - Google Patents

Hydraulikanlage Download PDF

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Publication number
EP1943179B1
EP1943179B1 EP06762989A EP06762989A EP1943179B1 EP 1943179 B1 EP1943179 B1 EP 1943179B1 EP 06762989 A EP06762989 A EP 06762989A EP 06762989 A EP06762989 A EP 06762989A EP 1943179 B1 EP1943179 B1 EP 1943179B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
hydraulic pump
fluid
storage device
piston
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.)
Not-in-force
Application number
EP06762989A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1943179A1 (de
Inventor
Herbert Baltes
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 EP1943179A1 publication Critical patent/EP1943179A1/de
Application granted granted Critical
Publication of EP1943179B1 publication Critical patent/EP1943179B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B2211/20561—Type of pump reversible
    • 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
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Definitions

  • the invention relates to a hydraulic system, in particular for lifting and lowering of loads in forklifts with at least one working cylinder, the piston-rod unit movably guided in a housing and by means of a hydraulic pump in its one drive direction extendable and retractable in its other opposite drive direction and with a, control device for controlling the pertinent Verfahrschulen according to the features of the preamble of claim 1.
  • the prior art further hydraulic systems are known in which two connected to each other on the piston side working cylinder in the form of so-called plunger cylinders are connected to a conventional hydraulic pump.
  • the hydraulic pump may have two opposite directions of rotation in the form of a fixed displacement pump and thus two opposite directions of transport for the fluid medium used.
  • a user-controllable control device in the manner of a control block allows the actuation of the hydraulic pump, to whose drive a conventional electric motor is used.
  • the hydraulic pump removes fluid from a tank reservoir and pushes the removed fluid onto the piston side of said working cylinder unit.
  • valve unit of the hydraulic pump is connected downstream for the purpose of controlling pilot valves in order to be able to produce a fluid-conducting connection between the hydraulic accumulator and respectively assignable working cylinder of the working machine here in the form of a forklift truck.
  • the valve unit is a directional control valve
  • the fluid leading in a switching position Away releases between a tank connection and the hydraulic pump and in the other switching position establishes a fluid-conducting connection between the hydraulic pump and the storage device, in particular the load lifting movement from the storage device can perform energy assisted, resulting in a lower drive power for the hydraulic pump with its motor result.
  • the retrieved energy under high pressure level of the fluid from the storage device can also be used for faster traversing movements on the respective working cylinder, which in this respect benefits a rapid operation.
  • the use of the storage device overall a harmonious, smooth operation of the entire hydraulic system can be achieved. By simply reversing the rotation of the hydraulic pump, the amount of fluid displaced during the lowering of the load from the working cylinder can be inserted into the storage device to increase its pressure levels and retrieved from there again at the next working cycle.
  • the hydraulic system is used in particular for lifting and lowering of loads not shown in forklifts, such as forklifts or other industrial trucks.
  • the plant has two cylinders 10 on a conventional design, which is referred to in the jargon also with plunger cylinder.
  • Each working cylinder 10 has a piston-rod unit 12 which subdivides the respective working cylinder 10 substantially fluid-tightly into a piston side 14 and a rod side 16.
  • the two piston sides 14 of the working cylinder 10 via a connecting line designated as a whole 18 in fluid communication with each other in connection and connected to an operator-controlled control device 20 in the manner of a control block.
  • the rod sides 16 are supplied in a conventional and therefore no longer shown manner with fluid in case of need, the pertinent amount of fluid is clearly removable again from the rod side 16 as an annular space.
  • a valve unit 34 is connected in the manner of a 3/2-way or switching valve, which is shown in the figure in an actuating position, in which a fluid-conducting connection between the hydraulic pump 26 and tank 24 is shown.
  • a branch line 36 to a storage device 38 in the form of a hydraulic accumulator in the manner of a piston accumulator is shut off in this switching position.
  • a fluid-carrying connection between branch line 36 and In the case in question, the tank connection to the tank 24 is blocked.
  • the operator-controlled control device 20 is able to control both the hydraulic pump 26 and the valve unit 34 obvious.
  • For operating the hydraulic pump 26 is a conventional, not shown electric motor, which is so far actuated by the control device 20.
  • a measuring point 40 can also be connected to monitor system states between the control device 20 and the hydraulic pump 26 in order to carry out, for example, pressure monitoring of the system.
  • pressure monitoring of the system.
  • the stored energy in the memory device 38 is retrieved in the form of a high pressure level and supports the lifting movement by the memory retrieved fluid quantity is pushed to the piston side 14 of the respective working cylinder 10. In this way, a kind of energy storage can be reached, which can callably support the lifting process.
  • the hydraulic system according to the invention is characterized by the use of the storage device 38 in that short system and reaction times are possible at high extension and retraction speeds for the working cylinder 10 used, and the electric drive of the hydraulic pump 26 is relieved accordingly. Furthermore, it has been found that all working movements dampened by the energy input into the memory device 38 are harmonious and thus smoothly. Despite the cost overhead for the realization of the indicated memory device, the associated energy saving is more cost-effective, especially in long-term operation than in systems without storage device. Also, the transport or capacity performance of the hydraulic pump 26 can be reduced by the use of the energy storage device 38, which in turn helps reduce the manufacturing costs.
  • the hydraulic pump used have two directions of rotation; However, the two directions of rotation can also be realized by means of the electric motor. It is also possible to replace the mentioned fixed-displacement pump with a variable displacement pump and the electric motor can also be replaced by another drive device, for example by an internal combustion engine, preferably in the form of a diesel engine, a working machine or the like.
  • the hydraulic system according to the invention is not limited to use with forklifts, but can preferably always be used where it is necessary to apply positional energy with the respective working cylinder. A more obvious Use is accordingly possible in working machines, such as excavators, but also in the area of elevators and handling equipment (manipulators).

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP06762989A 2005-11-02 2006-08-05 Hydraulikanlage Not-in-force EP1943179B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005052108A DE102005052108A1 (de) 2005-11-02 2005-11-02 Hydraulikanlage
PCT/EP2006/007768 WO2007051502A1 (de) 2005-11-02 2006-08-05 Hydraulikanlage

Publications (2)

Publication Number Publication Date
EP1943179A1 EP1943179A1 (de) 2008-07-16
EP1943179B1 true EP1943179B1 (de) 2012-03-21

Family

ID=37084862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06762989A Not-in-force EP1943179B1 (de) 2005-11-02 2006-08-05 Hydraulikanlage

Country Status (6)

Country Link
US (1) US7891181B2 (enExample)
EP (1) EP1943179B1 (enExample)
JP (1) JP2009515100A (enExample)
AT (1) ATE550290T1 (enExample)
DE (1) DE102005052108A1 (enExample)
WO (1) WO2007051502A1 (enExample)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140373739A1 (en) * 2009-08-18 2014-12-25 Demirer Teknolojik Sistemler Sanayi Ticaret Limite Sirketi Embodiment providing energy saving in hydraulic bending presses
DE102009048828A1 (de) * 2009-10-09 2011-04-14 Linde Material Handling Gmbh Hydraulische Vorrichtung und Verfahren zum Betrieb bei einer mobilen Arbeitsmaschine
CA2778892C (en) 2009-10-27 2016-09-20 The Tsurumi Seiki Co., Ltd. Float device
CN102241379B (zh) * 2010-05-13 2014-05-07 济南谨恒节能技术有限公司 节能型行走式液压搬运机械
NO331866B1 (no) * 2010-05-20 2012-04-23 Nat Oilwell Varco Norway As Anordning og fremgangsmate for a gjenvinne hydraulisk energi
DE102010021822B3 (de) * 2010-05-28 2011-07-21 Kapelski, Rainer, 24401 Vollständig autonome Laschplattform
AU2012236828B2 (en) * 2011-03-28 2017-02-02 Ocean Power Technologies, Inc. Wave energy converter with rotary hydraulic spring
FR2993613B1 (fr) * 2012-07-20 2014-08-15 Poclain Hydraulics Ind Circuit hydraulique de mise en cylindree progressive d'un appareil hydraulique
DE102012017004A1 (de) * 2012-08-28 2014-03-06 Hydac Technology Gmbh Hydraulisches Energierückgewinnungssystem
DE102013006204A1 (de) 2013-04-04 2014-10-09 Sennebogen Maschinenfabrik Gmbh Betätigungseinrichtung und Arbeitsgerätschaft mit einer solchen Betätigungseinrichtung
DE102013013690A1 (de) 2013-08-16 2015-02-19 Hydac Technology Gmbh System zur automatischen Anpassung einer vorgebbaren Gaseintragsmenge und Betätigungseinrichtung mit einem solchen System
DE102016002134A1 (de) 2016-02-23 2017-08-24 Liebherr-Mining Equipment Colmar Sas Vorrichtung zur Rekuperation von hydraulischer Energie sowie Arbeitsmaschine mit entsprechender Vorrichtung
US11493060B2 (en) 2019-06-04 2022-11-08 Industries Mailhot Inc. Hydraulic powering system and method of operating a hydraulic powering system
US11268501B1 (en) * 2019-06-04 2022-03-08 Hydraquip, Inc. Hydraulic system for high speed reciprocating cylinders
CN114810699B (zh) * 2022-04-08 2025-03-14 江苏大学 一种叉车势能回收再利用系统

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59169401U (ja) * 1983-04-28 1984-11-13 株式会社日立製作所 液圧装置
US4761954A (en) * 1987-03-16 1988-08-09 Dynamic Hydraulic Systems, Inc. Fork-lift system
JPH04219502A (ja) * 1990-12-14 1992-08-10 Kayaba Ind Co Ltd 油圧シリンダの駆動回路
FI99110C (fi) * 1993-06-01 1997-10-10 Kone Oy Menetelmä hissin käyttämiseksi ja hissikoneisto
JP2880887B2 (ja) * 1993-11-08 1999-04-12 株式会社島津製作所 バッテリ式産業用車両の液圧装置
IT1280604B1 (it) * 1995-11-02 1998-01-23 Sme Elettronica Spa Gruppo di potenza per l'alimentazione di attuatori idraulici
DE19844648A1 (de) * 1998-08-06 2000-02-10 Mannesmann Rexroth Ag Hydro-Transformator
JP2000136806A (ja) * 1998-11-04 2000-05-16 Komatsu Ltd 圧油のエネルギー回収装置および圧油のエネルギー回収・再生装置
SE521308C2 (sv) * 1999-12-27 2003-10-21 Bruun Ecomate Ab Mobil hanteringsanordning med hydraulkrets
SE523397C2 (sv) * 2001-05-22 2004-04-13 Bruun Ecomate Ab Mobil hanteringsanordning
DE102004044244A1 (de) * 2004-09-14 2006-03-30 Hydac System Gmbh Federungssystem

Also Published As

Publication number Publication date
WO2007051502A1 (de) 2007-05-10
US7891181B2 (en) 2011-02-22
ATE550290T1 (de) 2012-04-15
DE102005052108A1 (de) 2007-05-03
JP2009515100A (ja) 2009-04-09
EP1943179A1 (de) 2008-07-16
US20090120084A1 (en) 2009-05-14

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