EP1188709B1 - Dispositif de levage - Google Patents

Dispositif de levage Download PDF

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Publication number
EP1188709B1
EP1188709B1 EP20010121831 EP01121831A EP1188709B1 EP 1188709 B1 EP1188709 B1 EP 1188709B1 EP 20010121831 EP20010121831 EP 20010121831 EP 01121831 A EP01121831 A EP 01121831A EP 1188709 B1 EP1188709 B1 EP 1188709B1
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EP
European Patent Office
Prior art keywords
valve
line
hydraulic
lifting
lifting 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.)
Expired - Lifetime
Application number
EP20010121831
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German (de)
English (en)
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EP1188709A3 (fr
EP1188709A2 (fr
Inventor
Recep Macit
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 GmbH
Original Assignee
STILL GmbH
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Publication date
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Priority claimed from DE10049829A external-priority patent/DE10049829A1/de
Application filed by STILL GmbH filed Critical STILL GmbH
Publication of EP1188709A2 publication Critical patent/EP1188709A2/fr
Publication of EP1188709A3 publication Critical patent/EP1188709A3/fr
Application granted granted Critical
Publication of EP1188709B1 publication Critical patent/EP1188709B1/fr
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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

Definitions

  • the invention relates to a hydraulic lifting device for a battery-electrically operated truck, wherein the lifting device has a vertically movable load-receiving means, which is operatively connected to at least one hydraulic lifting cylinder, which operates with a working in lifting operation as a pump and sink operation as a motor hydraulic unit in combination is in operative connection with a working in the lifting operation as a motor and sink operation as a generator electric machine, wherein in a guided from the hydraulic unit to the lifting cylinder pressure medium line a valve for lifting a pending load on the lifting cylinder is arranged and wherein the pressure medium power between the valve for lifting and the Hubyzylinder branches off a branch line, in which a valve for lowering the load on the lifting cylinder is arranged.
  • lifting devices for battery-powered trucks lifting a vertically movable lifting device by means of at least one lifting cylinder, which is connected to the hydraulic unit, which operates in lifting operation as a pump, promotes pressure medium to the lifting cylinder and is driven by the working as a motor electric machine .
  • the pressure medium flow flowing out of the lifting cylinder is passed through the hydraulic unit, which operates as a pump in sink operation and drives the electric machine operating as a generator.
  • the potential energy of the load released during lowering of the lifting device can be recovered by converting the potential energy from the electric machine operating as a generator into electrical energy and feeding it into the battery. Energy recovery during sinking results in a longer battery charge life, allowing the truck to have a higher throughput with one battery charge.
  • the load is based on opening a arranged between the lifting cylinder and the hydraulic unit load-holding valve exclusively on the hydraulic unit and coupled to this electric machine.
  • a speed control of the electric machine can lead to an inaccurate setting of the lowering speed, since the leakage occurring at the hydraulic machine is not detected by the speed sensor of the electric machine and thus the leakage of the hydraulic machine in the setting of Lowering speed is not taken into account.
  • a lifting device in which a control valve for controlling the lifting operation and lowering operation is provided.
  • the lifting cylinder In the lowering mode, the lifting cylinder can be connected to the tank by means of a reversing valve as a function of the consumer pressure via a lowering brake to a container or for energy recovery.
  • the speed of the hydraulic unit in the sink operation in generator operation of the hydraulic unit is in this case controlled such that the pressure difference occurring at the control valve is maintained at a constant value.
  • the control valve for controlling the lifting and lowering movement has a high Construction costs on.
  • the measurement of the pressure difference on the control valve and the arrangement of a lowering brake results in a high construction cost for the control of the lowering movement at high lowering speeds and in the fine control range.
  • a generic lifting device is known from EP 1 052 215 A2, which corresponds to the preamble of independent claim 1.
  • the sink rate is controlled by a flow control valve located in a conduit which is routed from a delivery line of the pump to a suction line of the pump.
  • the flow of fluid flowing from the lifting cylinder via the flow control valve passes through the hydraulic unit operating as a motor, wherein the electrical machine in operative connection with the hydraulic unit operates at idling, and flows via a bypass line and an open shut-off valve to the container.
  • no energy recovery is possible in sink operation.
  • an elaborate sensor device on the lifting cylinder is required to detect the lowering speed.
  • the present invention has for its object to provide a lifting device of the type mentioned available, which allows control of the lifting and lowering operation with low construction costs and has an effective energy recovery in sink operation.
  • a valve in the leading from the hydraulic unit to the lifting cylinder pressure medium line is provided for controlling the lifting movement.
  • the lowering movement is controllable by means of a further valve which is arranged in a branch line branching off from the pressure medium line, wherein the pressure medium flowing out of the lifting cylinder can be returned to the hydraulic unit by means of the switching valve, if a corresponding consumer pressure is present on the lifting cylinder.
  • This will be an effective Energy recovery enabled according to existing potential energy.
  • the switching valve can be acted upon in the switching position connecting the branch line with the hydraulic unit when the consumer pressure exceeds a predetermined value.
  • An energy recovery is thus at a corresponding Consumer pressure, which enables effective energy recovery.
  • a simple control of the lowering movement is possible by means of the valve in the branch line.
  • the switching valve can be acted upon by the consumer pressure, for example.
  • a pressure measuring device in particular a pressure switch, is provided for detecting the consumer pressure, which is in operative connection with the switching valve.
  • the switching valve can be acted upon in a position for energy recovery in a simple manner with a corresponding consumer pressure on the lifting cylinder.
  • the arranged in the pressure medium line valve for lifting as in throttling intermediate positions valve with a blocking position and a flow position is formed.
  • the lifting movement can be controlled with little effort for the valve.
  • the arranged in the branch valve for lowering is designed as a throttle valve in intermediate positions with a valve seat designed as a blocking position and a flow position.
  • a proportional valve results in the control of the sink movement, a small valve effort. Due to the seat valve function in the blocking position, an outflow of pressure medium via the branch line can be avoided in a simple manner in the lifting operation.
  • the hydraulic unit in which the hydraulic unit is operable in two directions of rotation, there is a low circuit complexity, when the switching valve is in communication with the pressure medium line between the hydraulic unit and the valve for lifting.
  • the branch line is connected to the working as a motor hydraulic unit, wherein the hydraulic unit is driven in a lifting operation opposite direction of rotation and on the working as a generator electric machine energy recovery is possible.
  • a guided from the pressure medium line of the hydraulic unit to a container circulation line is provided, in which a pressure compensator is arranged which has a pressure medium line with the container connecting switching position and a branch line to the pressure medium line switching position.
  • the pressure balance of the pending in the branch line pressure in the branch line to the pressure medium line connecting switching position can be acted upon.
  • a connection of the branch line to the pressure medium line connected to the hydraulic unit can be produced in a simple manner at the corresponding pressure in the branch line.
  • the hydraulic unit is operable in one direction of rotation
  • the switching valve is connected to a guided from a container to the hydraulic unit line, wherein in the line between the container and the connection of the branch line is arranged in the direction of the hydraulic unit opening check valve.
  • a hydraulic unit which can be operated in one direction of rotation can be used, with the non-return valve avoiding outflow of pressure medium flowing out of the lifting cylinder to the container.
  • a load-holding valve is arranged in the pressure medium line between the connection of the branch line and the lifting cylinder.
  • the load-holding valve in a position for lowering a load on the lifting cylinder can be opened in an open position, a connection of the lifting cylinder with the valve for lowering at low circuit complexity can be made in sink operation.
  • a drain line is connected, which is connected to the branch line between the valve for lowering and the changeover valve, wherein in the drain line, a check valve is arranged.
  • a rotational speed measuring device which detects the rotational speed of the electric machine.
  • a feedback signal for controlling the lifting or lowering speed of the load can be determined in a simple manner.
  • the predetermined lifting speed can be adjusted in a simple manner by activating the valve for lifting as a function of a desired value setting device and the feedback signal.
  • lowering gearbox with energy recovery can be operated at a fully open valve for lowering the electric machine in response to the setpoint input device and the feedback signal, the electric machine in a simple manner with a speed such that the set at the setpoint input device sink speed is achieved.
  • the electric machine can be designed as a DC machine. Particular advantages arise when the electrical machine is designed as an asynchronous machine. With an asynchronous machine results in lowering operation, an automatic recovery of electrical energy into the battery, resulting in a low construction cost for the lifting device.
  • FIG. 1 shows a hydraulic drive system 1 of a battery-powered industrial truck with a lifting device 3 according to the invention.
  • the drive system comprises, in addition to the lifting device 3, a tilting device 2 and a device 4 for actuating an additional consumer, for example a side slide.
  • the hydraulic drive system 1 has a hydraulic unit 5a, which is in operative connection with an electric machine 6 designed as a DC machine or asynchronous machine.
  • the electric machine 6 is connected to the supply of electrical energy with a battery not shown in connection.
  • the hydraulic unit 5a is operable in two directions of rotation and is connected by means of a line 7 with a container 8 in connection.
  • a delivery line 10 Connected to the hydraulic unit 5a is a delivery line 10 which communicates with a control valve device 11 consisting of two control valves for controlling the tilting device 2 and a control valve device 12 consisting of two control valves for controlling the device 4.
  • the control valve devices 11, 12 are connected on the output side to a container line 13 guided to the container 8.
  • a priority valve 14 is disposed between the hydraulic unit 5a and the connection of the control valve devices 11, 12, which serves with a pressure medium line 15 for priority supply of a hydraulic steering device, not shown.
  • the lifting device 3 has at least one hydraulic lifting cylinder 20 which is connected to a load-carrying means (not shown) for lifting and lowering a load in Active compound is.
  • the lifting cylinder 20 is connected by means of a pressure medium line 21 to the delivery line 10 of the hydraulic unit 5a.
  • a valve 22 for lifting a lifting cylinder 20 pending load is arranged in the delivery line 10 in this case.
  • a branch line 23 is connected to the pressure medium line 21, in which a valve 24 is arranged for lowering a load applied to the lifting cylinder 20.
  • a changeover valve 25 is arranged in the branch line 23, which connects the branch line 23 with the container line 13 in a first switching position 25a.
  • the branch line 23 is in communication with the delivery line 10 of the hydraulic unit 5a.
  • the changeover valve 25 can be connected on the output side to a line 45 and a line 46, the line 45 being led to the delivery line 10 and the line 46 being connected to the container line 13.
  • the switching valve 25 is acted upon by means of a spring 26 in the switching position 25a and in dependence on the pending on the lifting cylinder 20 consumer pressure in the switching position 25b.
  • the changeover valve 25 is formed as an electrically controllable changeover valve and in the pressure medium line 21, a pressure measuring device 30, for example a pressure switch disposed, which is operatively connected to an example formed as a solenoid actuator 27 of the reversing valve, which acts on the switching valve 25 in the direction of the switching position 25b ,
  • a load-holding valve 31 is further arranged between the connection of the branch line 23 and the lifting cylinder 20.
  • the lifting valve 22 is designed as a two-position valve throttling in intermediate positions with a blocking position 22a and a flow-through position 22b. In the direction of the position 22a, the valve 22 is acted upon by a spring 35. In the direction of the flow position, the valve 22 can be acted upon by means of an electro-hydraulic actuating means 36.
  • the valve 24 for lowering is designed as a two-position valve throttling in intermediate positions and has a locking position 24a designed as a seat valve and a flow position 24b. The valve 24 is acted upon by means of a spring 37 in the direction of the locking position 24a.
  • an electro-hydraulic Actuating means 38 is provided to actuate the valve 24 in the flow position 24b.
  • the load-holding valve 31 can be opened in an open position.
  • a circulation line 40 is connected in front of the priority valve 14 of the steering device, in which a pressure compensator 41 is arranged.
  • the pressure balance 41 connects in the illustrated switching position, the delivery line 10 with the container.
  • the circulation line 40 connected to the delivery line 10 is in communication with the line 45 routed to the changeover valve 25.
  • the pressure compensator 41 can be acted upon by the pressure in the delivery line 10 in the illustrated switching position.
  • the pressure balance 41 from the highest load pressure of the load of the tilting device 2, the lifting device 3, the device 4 and the steering device acted upon.
  • the pressure balance 41 continues to be acted upon by the downstream of the switching valve 25 in the line 45 pending pressure.
  • a drain line 50 is connected between the load-holding valve 31 and the lifting cylinder 20, which is guided to the branch line 23 between the valve 24 and the switching valve 25, wherein in the discharge line 50, a normally in blocking position located check valve 51 is arranged.
  • FIG. 2 shows a drive system 1 for a battery-powered industrial truck with a second embodiment of a lifting device 3 according to the invention.
  • the hydraulic unit 5b can be operated in one direction of rotation.
  • the connected to the switching valve 25 line 45 is in this case connected to the line 7, wherein in the line 7 between the connection of the line 45 and the container 8 in the direction of the hydraulic unit 5b opening check valve 52 is arranged.
  • the circulation line 40 is guided by the delivery line 10 to the container 8, wherein the Pressure compensator 41 can be acted upon by the highest load pressure of the consumer in the direction of a blocking position.
  • the valve 22 is for lifting and the valve 24 for lowering in the blocking position.
  • the load-holding valve 31 is acted upon by the consumer pressure of the lifting cylinder 20 pending load in the locked position, whereby the load 20 is shut off and the load complies with the set lift height.
  • the valve 22 In an operating state for lifting, the valve 22 is acted upon in the direction of the switching position 22b as a function of the actuation of a setpoint specification device (not shown), for example a joystick. At the same time by a speed control of the electric machine that works as a motor, operating as a pump hydraulic unit 5a, 5b driven whereby the hydraulic unit promotes pressure fluid from the container 8 in the delivery line 10 and the valve 22 acted on in flow position in the pressure medium line 21. If the pressure prevailing in the pressure medium line 21 exceeds the consumer pressure of the load present on the lifting cylinder 20, the load-holding valve 31 opens, as a result of which the load applied to the lifting cylinder 20 is raised.
  • a setpoint specification device not shown
  • the pressure compensator 41 is in this case acted upon by the delivery pressure of the hydraulic unit 5a, 5b or the load pressure of the lifting cylinder 20 in the switching position shown in FIG. 1 or 2 above, in which the connection of the delivery line 10 to the container 8 is blocked ,
  • the load can be raised with the predetermined lifting speed at the setpoint input device.
  • the valve 24 In an operating state for lowering the load applied to the lifting cylinder 20, the valve 24 is acted upon by a corresponding actuation of the actuating device 38 in response to the actuation of the setpoint input device in the direction of the switching position 24b, wherein at the same time the load-holding valve 31 is opened in the open position.
  • Pressure medium can thus flow from the lifting cylinder 20 via the pressure medium line 21, the branch line 23, the valve located in the flow position 24 to the reversing valve 25.
  • the pressure measuring device 30 provides no signal, whereby the reversing valve 25 remains in the position shown and the pressure medium flows via the line 46 to the container 8.
  • the lowering speed is set by the lowering valve 24, whereby the lowering movement can be controlled in a simple manner.
  • the pressure measuring device 30 responds and delivers a control signal which acts on the switching valve 25 in the switching position 25b.
  • the branch line 23 communicates with the line 45. Due to the upcoming consumer pressure in the control pressure line 47, the pressure compensator 41 is acted upon in the direction of the switching position shown in the figure above, in which the line 45 is in communication with the delivery line 10. Pressure medium flowing out of the lifting cylinder 20 thus flows via the branch line 23, the switching valve 25, the line 45 to the delivery line 10, whereby the hydraulic unit 5a is driven and operates as a motor and drives the electric machine 6 operating as a generator. In this case, the electric machine 6 generates a braking torque for load-holding the load applied to the lifting cylinder 20 and feeds electrical energy back into the battery.
  • the electric machine 6 of the lifting device of Figure 1 in this case has a different direction of rotation in lifting and lowering operation.
  • the branch line 23 and thus the line 45 is connected to the line 7 at a corresponding consumer pressure of the lifting cylinder 20 in lowering operation and thus in the switching position 25b beaufbagtem reversing valve 25, whereby the hydraulic unit 5b of which from the lifting cylinder 20 outflowing pressure medium is driven and operates as a motor that drives the working as a generator electric machine 6.
  • the electric machine 6 generates a braking torque for load-holding the load applied to the lifting cylinder 20 and feeds electrical energy back into the battery.
  • the pressure medium flowing out from the hydraulic unit 5b operating as a motor flows via the bypass line 40 and the pressure compensator 41 located in the flow position to the container 8.
  • the hydraulic unit 5b according to FIG. 2 therefore has the same direction of rotation in lifting and lowering operation.
  • the valve 24 can be completely turned on in response to the pressure measuring device 30 in the flow position 24b, whereby small losses occur and the potential energy of the load can be recovered with low losses as electrical energy.
  • a feedback signal for controlling the rotational speed of the electric machine 6 can be determined in the lowering operation with energy recovery in order to lower the load with the lowering speed predetermined at the desired value setting device.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (15)

  1. Dispositif de levage hydraulique pour un chariot de manutention électrique fonctionnant sur batterie, le dispositif de levage (3) présentant un moyen de suspension de charge mobile dans le sens vertical, qui est en liaison active avec au moins un vérin de levage hydraulique (20), lequel est en liaison avec un groupe hydraulique (5a ; 5b) fonctionnant en tant que pompe en mode levage et en tant que moteur en mode descente, lequel est en liaison motrice avec une machine électrique (6) fonctionnant en tant que moteur en mode levage et en tant que générateur en mode descente, une vanne (22) destinée à lever une charge appliquée sur le vérin de levage (20) étant disposée dans une conduite de fluide sous pression (21) menant du groupe hydraulique (5a ; 5b) au vérin de levage (20) et une conduite de dérivation (23) dans laquelle est disposée une vanne (24) destinée à faire descendre la charge appliquée au vérin de levage (20) étant dérivée de la conduite de fluide sous pression (21) entre la vanne (22) de levage et le vérin de levage (20), caractérisé en ce qu'une vanne d'inversion (25) est disposée dans la conduite de dérivation (23) en aval de la vanne (24) de descente, laquelle peut être alimentée en fonction de la pression de récepteur appliquée au vérin de levage (20) dans une position de commutation (25a) qui relie la conduite de dérivation (23) avec un réservoir (8) ou une position de commutation (25b) qui relie la conduite de dérivation (23) avec le groupe hydraulique (5a ; 5b).
  2. Dispositif de levage hydraulique selon la revendication 1, caractérisé en ce que la vanne d'inversion (25) dans la conduite de dérivation (23) peut être alimentée avec la position de commutation (25b) qui la relie avec le groupe hydraulique (5a ; 5b) lorsque la pression de récepteur dépasse une valeur prédéfinie.
  3. Dispositif de levage hydraulique selon la revendication 1 ou 2, caractérisé en ce qu'il est prévu un dispositif de mesure de la pression (30), notamment un pressostat destiné à détecter la pression de récepteur, lequel est en liaison active avec la vanne d'inversion (25).
  4. Dispositif de levage hydraulique selon l'une des revendications 1 à 3, caractérisé en ce que la vanne (22) de levage disposée dans la conduite de fluide sous pression (21) est réalisée sous la forme d'une vanne à étranglement dans les positions intermédiaires avec une position de blocage (22a) et une position de passage (22b).
  5. Dispositif de levage hydraulique selon l'une des revendications 1 à 4, caractérisé en ce que la vanne (24) de descente disposée dans la conduite de dérivation (23) est réalisée sous la forme d'une vanne à étranglement dans les positions intermédiaires avec une position de blocage (24a) réalisée sous la forme d'une soupape à siège et une position de passage (24b).
  6. Dispositif de levage hydraulique selon l'une des revendications 1 à 5, le groupe hydraulique (5a) pouvant fonctionner dans deux sens de rotation, caractérisé en ce que la vanne d'inversion (25) est en liaison avec la conduite de fluide sous pression (21) entre le groupe hydraulique (5a) et la vanne (22) de levage.
  7. Dispositif de levage hydraulique selon la revendication 6, caractérisé en ce qu'il est prévu une conduite de circulation (40) qui mène de la conduite de fluide sous pression (21) du groupe hydraulique (5a) à un réservoir (8), dans laquelle est disposée une balance de pression (41), laquelle présente une position de commutation qui relie la conduite de fluide sous pression (21) avec le réservoir (8) et une position de commutation qui relie la conduite de dérivation (23) avec la conduite de fluide sous pression (21).
  8. Dispositif de levage hydraulique selon la revendication 7, caractérisé en ce que la balance de pression (41), dans la position qui relie la conduite de dérivation (23) avec la conduite de fluide sous pression (21), peut être alimentée par la pression produite dans la conduite de dérivation (23).
  9. Dispositif de levage hydraulique selon l'une des revendications 1 à 5, le groupe hydraulique (5b) pouvant fonctionner dans un sens de rotation, caractérisé en ce que la vanne d'inversion (25) est raccordée à une conduite (7) qui mène d'un réservoir (8) vers le groupe hydraulique (5b), une vanne d'arrêt (52) s'ouvrant en direction du groupe hydraulique (5b) étant disposée dans la conduite (7) entre le réservoir (8) et le raccord de la conduite de dérivation (23).
  10. Dispositif de levage hydraulique selon l'une des revendications 1 à 9, caractérisé en ce qu'une vanne de retenue de la charge (31) est disposée dans la conduite de fluide sous pression (21) entre le raccord de la conduite de dérivation (23) et le vérin de levage (20).
  11. Dispositif de levage hydraulique selon la revendication 10, caractérisé en ce que la vanne de retenue de la charge (31), dans une position destinée à faire descendre une charge appliquée sur le vérin de levage (20), peut être commandée dans une position ouverte.
  12. Dispositif de levage hydraulique selon la revendication 10 ou 11, caractérisé en ce qu'entre la vanne de retenue de la charge (31) et le vérin de levage (20) est disposée une conduite d'évacuation (50) qui est raccordée à la conduite de dérivation (23) entre la vanne (24) de descente et la vanne d'inversion (25), une vanne d'arrêt (51) étant disposée dans la conduite d'évacuation.
  13. Dispositif de levage hydraulique selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un dispositif de mesure de la vitesse de rotation qui détecte la vitesse de rotation de la machine électrique (6).
  14. Dispositif de levage hydraulique selon l'une des revendications précédentes, caractérisé en ce que la machine électrique (6) est réalisée sous la forme d'une machine à courant continu.
  15. Dispositif de levage hydraulique selon l'une des revendications 1 à 13, caractérisé en ce que la machine électrique (6) est réalisée sous la forme d'une machine asynchrone.
EP20010121831 2000-09-18 2001-09-11 Dispositif de levage Expired - Lifetime EP1188709B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10045998 2000-09-18
DE10045998 2000-09-18
DE10049829 2000-10-09
DE10049829A DE10049829A1 (de) 2000-09-18 2000-10-09 Hubvorrichtung

Publications (3)

Publication Number Publication Date
EP1188709A2 EP1188709A2 (fr) 2002-03-20
EP1188709A3 EP1188709A3 (fr) 2005-04-13
EP1188709B1 true EP1188709B1 (fr) 2006-11-02

Family

ID=26007087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010121831 Expired - Lifetime EP1188709B1 (fr) 2000-09-18 2001-09-11 Dispositif de levage

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EP (1) EP1188709B1 (fr)
DE (1) DE50111349D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102108948B (zh) 2010-12-28 2012-11-28 山河智能装备股份有限公司 一种适用于装卸搬运电动车的能量再生发电系统
DE102011056069B4 (de) 2011-12-06 2022-08-04 Still Gesellschaft Mit Beschränkter Haftung Verfahren zum Betrieb eines Hydrauliksystems einer mobilen Arbeitsmaschine
DE102011056068B4 (de) 2011-12-06 2022-08-11 Still Gesellschaft Mit Beschränkter Haftung Hydrauliksystem einer mobilen Arbeitsmaschine
CN102808783A (zh) * 2012-01-18 2012-12-05 侯学青 机电一体化光伏直流大功率潜水泵
DE102014108370B4 (de) * 2014-06-13 2020-10-01 Jungheinrich Aktiengesellschaft Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317782C2 (de) * 1993-05-28 1996-01-18 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen
DE4416173C2 (de) * 1994-05-06 1996-05-30 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge oder dergleichen
DE19921629B4 (de) * 1999-05-10 2005-05-25 Dambach Lagersysteme Gmbh Hydraulische Hubvorrichtung

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EP1188709A3 (fr) 2005-04-13
EP1188709A2 (fr) 2002-03-20
DE50111349D1 (de) 2006-12-14

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