EP1943179A1 - Hydraulikanlage - Google Patents
HydraulikanlageInfo
- Publication number
- EP1943179A1 EP1943179A1 EP06762989A EP06762989A EP1943179A1 EP 1943179 A1 EP1943179 A1 EP 1943179A1 EP 06762989 A EP06762989 A EP 06762989A EP 06762989 A EP06762989 A EP 06762989A EP 1943179 A1 EP1943179 A1 EP 1943179A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic
- hydraulic system
- hydraulic pump
- fluid
- control device
- 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
Links
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 whose piston rod unit is movably guided in a housing and retractable by means of a hydraulic pump in its one drive direction and retractable in its other opposite drive direction and with a control device for controlling the traversing movements.
- a suspension system is shown as a hydraulic system, in particular for use in a mast of a forklift, with at least one hydraulic accumulator and at least one switching valve for producing a fluid-carrying connection by means of a control line between the hydraulic accumulator and a mast operable by the mast , And with a lifting and lowering line for driving the working cylinder in a raised or lowered position, wherein the lifting and the sink line each open into a main branch, which open into parallel to each other with a connection point in front of and behind the switching valve in the control line and wherein in the main branches valves are connected, which have an opposite direction of action or drive for each main branch.
- the prior art further discloses generic hydraulic systems in which two working cylinders connected to one another on the piston side are connected in the form of so-called plunger cylinders 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 supply container and pushes the removed fluid onto the piston side of said working cylinder unit.
- the known hydraulic system To lower the load and thus to retract the working cylinder, the direction of rotation of the hydraulic pump is reversed, and the fluid displaced beyond the piston side again reaches the tank side of the known hydraulic system.
- the known system For lifting and lowering of loads, the known system requires a high working capacity of the hydraulic pump and therefore a high drive power for the upstream electric motor. Also, the known hydraulic system, as regards the possible Verfahrgeschwindigi- th for the working cylinder, limited.
- the present invention seeks to improve the known solutions to the effect that at low cost energetically favorable operation of a pertinent Hydraulic system is possible.
- This object is achieved by a hydraulic system with the features of claim 1 in its entirety.
- a memory device which undergoes a power supply in a drive direction of the hydraulic pump, and that the injected energy to support a movement in opposite direction of drive of the hydraulic pump from the storage device is retrievable, in particular, the lifting movement can be the storage device energy-assisted perform, which has a lower drive power for the hydraulic pump with its engine 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.
- a hydraulic accumulator for the accumulator device, in particular in the manner of a piston accumulator, and a valve unit serves as part of the operator-guided control device for producing or interrupting a fluid-conducting connection between the hydraulic pump and the accumulator device.
- 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 working cylinders 10 of conventional design, which are also known in the trade as plunger cylinders, each working cylinder 10 has a piston-rod unit 12, the respective working cylinder 10 substantially fluid-tight in a KoI- benseite 14 and a rod side 16 divided.
- 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.
- the respective piston-rod unit 12 is guided in a housing 22 of the working cylinder 10 and for a lifting operation, not shown, a lifting load and / or for extending the mast of a forklift drives in the viewing direction, the piston rod unit 12 from the housing 22 upwards, and for a lowering operation, the piston-rod unit 12 moves in the direction of the piston side 14 of each working cylinder 10.
- the pertinent lifting and lowering operations are known, so that will not be discussed in detail here at this point.
- a commercially available hydraulic pump 26 is connected to the connecting line 18 between the control device 20 and a supply or storage tank 24 with two opposite directions of rotation, which are indicated by arrows 28 in the figure.
- the hydraulic pump 26 fluid in two opposite directions 30, 32 transport, which are shown in the representation of the figure by the standard arrows of the standard drawing representation of the hydraulic pump 26.
- the hydraulic pump 26 may be configured as a constant pump.
- a valve unit 34 is connected in the manner of a 3/2-way or switching valve it, 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 hy- dro 1918 in the manner of a piston accumulator is shut off in this switching position.
- a fluid-carrying connection between branch line 36 and Input side of the hydraulic pump 26 manufactured. In this case, the tank connection to the tank 24 is blocked.
- the operator-controlled control device 20 is able to control both the hydride pump 26 and the valve unit 34 in a noticeable manner.
- 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. Depending on the sensors used, it is also possible to carry out further monitoring activities, also in combination with one another, based on temperature, viscosity, degree of contamination etc. of the fluid used in each case.
- the valve unit 34 At a first start of the hydraulic system with flud nurse not filled memory 38, the valve unit 34 is in its switching position shown in the figure, and the hydraulic pump 26 takes fluid from the tank 24 and pushes the relevant amount in the direction of the piston side 14 of the working cylinder 10 for a lifting operation. Now, if the load is lowered, the valve 34 is actuated and the recirculated via the hydraulic pump 26 fluid now passes to the fluid side 42 of the storage device 38 and raises the piston against the working gas supply accordingly.
- the separating element such as a piston or a membrane, separates the fluid side from the gas side enclosed in the storage housing, which can store energy in compressed fashion.
- the energy stored in the storage device 38 is called up in the form of a high pressure level and supports the lifting movement, in that the rather 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 damped by the energy input into the memory device 38 are harmonious and therefore smooth. 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 cost.
- 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 in forklifts, but can preferably always be used where position energy is to be applied 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).
- the directional control valve used in the circuit of the figure is formed in the manner of a 3/2-way valve; Here is also an implementation with a 3/3-way valve conceivable that can contribute to the extent corresponding to the switching position to relieve the memory 38 with. Furthermore, the control device 20 shown in the figure need not be realized in this way and can accordingly be dispensed with. Necessarily, then, only a control device for driving the motor and / or the indicated hydraulic pump. Instead of the control device 20 shown in the figure, a pipe rupture protection or the like could be inserted into the hydraulic system at this point (not shown). In the control of the overall system, a corresponding sensor with measuring points for the hydraulic accumulator can be used. Thus, for example, by monitoring the piston position of the hydraulic accumulator as well as the degree of its filling volume and / or filling pressure, further statements could be made for controlling the overall hydraulic system.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Combustion & Propulsion (AREA)
- Mining & Mineral Resources (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Description
Claims
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 true EP1943179A1 (de) | 2008-07-16 |
EP1943179B1 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 (de) |
EP (1) | EP1943179B1 (de) |
JP (1) | JP2009515100A (de) |
AT (1) | ATE550290T1 (de) |
DE (1) | DE102005052108A1 (de) |
WO (1) | WO2007051502A1 (de) |
Families Citing this family (15)
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 |
EP2481666B1 (de) | 2009-10-27 | 2016-11-23 | The Tsurumi Seiki Co., Ltd. | Schwimmvorrichtung |
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 |
WO2012135154A1 (en) * | 2011-03-28 | 2012-10-04 | 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 |
US11268501B1 (en) * | 2019-06-04 | 2022-03-08 | Hydraquip, Inc. | Hydraulic system for high speed reciprocating cylinders |
US11493060B2 (en) | 2019-06-04 | 2022-11-08 | Industries Mailhot Inc. | Hydraulic powering system and method of operating a hydraulic powering system |
CN114810699A (zh) * | 2022-04-08 | 2022-07-29 | 江苏大学 | 一种叉车势能回收再利用系统 |
Family Cites Families (11)
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 |
-
2005
- 2005-11-02 DE DE102005052108A patent/DE102005052108A1/de not_active Withdrawn
-
2006
- 2006-08-05 EP EP06762989A patent/EP1943179B1/de not_active Not-in-force
- 2006-08-05 WO PCT/EP2006/007768 patent/WO2007051502A1/de active Application Filing
- 2006-08-05 US US11/992,053 patent/US7891181B2/en active Active
- 2006-08-05 AT AT06762989T patent/ATE550290T1/de active
- 2006-08-05 JP JP2008538262A patent/JP2009515100A/ja not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2007051502A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007051502A1 (de) | 2007-05-10 |
ATE550290T1 (de) | 2012-04-15 |
JP2009515100A (ja) | 2009-04-09 |
US7891181B2 (en) | 2011-02-22 |
DE102005052108A1 (de) | 2007-05-03 |
EP1943179B1 (de) | 2012-03-21 |
US20090120084A1 (en) | 2009-05-14 |
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