EP2058270A1 - Dispositif de levage électrohydraulique - Google Patents

Dispositif de levage électrohydraulique Download PDF

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Publication number
EP2058270A1
EP2058270A1 EP07021578A EP07021578A EP2058270A1 EP 2058270 A1 EP2058270 A1 EP 2058270A1 EP 07021578 A EP07021578 A EP 07021578A EP 07021578 A EP07021578 A EP 07021578A EP 2058270 A1 EP2058270 A1 EP 2058270A1
Authority
EP
European Patent Office
Prior art keywords
valve
load condition
lowering
lifting device
pressure
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
EP07021578A
Other languages
German (de)
English (en)
Other versions
EP2058270B1 (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.)
Hawe Hydraulik SE
Original Assignee
Hawe Hydraulik SE
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 Hawe Hydraulik SE filed Critical Hawe Hydraulik SE
Priority to EP20070021578 priority Critical patent/EP2058270B1/fr
Priority to DE200750003962 priority patent/DE502007003962D1/de
Publication of EP2058270A1 publication Critical patent/EP2058270A1/fr
Application granted granted Critical
Publication of EP2058270B1 publication Critical patent/EP2058270B1/fr
Expired - Fee Related 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

Definitions

  • the invention relates to an electro-hydraulic lifting device specified in the preamble of claim 1. Art.
  • a known electro-hydraulic lifting device either a 3-way current controller with proportional solenoid or a proportional switching valve is arranged in the positive sequence.
  • the delivery side of the pump is connected via a bypass line with a solenoid switching valve to the tank. Since the solenoid valve in the bypass line is controlled for passage when controlling the lowering speed, either via the 3-way flow regulator or via the proportional switching valve, hydraulic medium is always conveyed by the pump. In a low load condition, this may require electrically driving the pump.
  • a known electro-hydraulic lifting device is a lowering speed-regulating pressure compensator included in the Senkstrang, and branches the Senkstrang downstream of the pressure compensator on a 3/2-way solenoid valve in a Nutzsenktechnisch and a drain line to the tank.
  • the 3/2-way solenoid valve is only switched to direct passage to the tank when the lowering pressure and the lowering volume are smaller than the needs of secondary consumers. Regardless of a low-load condition of the lifting cylinder. In a low-load condition, on the other hand, hydraulic fluid is sometimes passed through the pump, which then has to be driven electrically.
  • the invention has for its object to provide an electro-hydraulic lifting device of the type mentioned, in which at a low load condition energy loss is excluded by driving the pump.
  • the 3/2-way switching valve is acted upon by a spring by the pilot pressure, which is tapped off downstream of the lowering valve, so that even then no hydraulic medium is passed through the pump, when there is higher pressure upstream of the lowering valve, However, the pressure downstream of the lowering valve is not sufficient for energy recovery.
  • the 3/2-way switching valve leads the hydraulic medium directly to the tank only if, after detecting the low-load condition arranged between the Senkstrang and the 3/2-way switching valve in the pilot control solenoid valve the pilot control line switches to continuity. This is done via a dialer that distinguishes between the low load condition and a high load condition, either automatically or optionally by manual operation.
  • the selector device has a pressure transducer or pressure switch in the lowering line, with which the detection of the low-load condition is carried out and the selector device is informed accordingly.
  • the selector can then either automatically or operator-prompted to initiate the appropriate switching operation to drain the hydraulic medium directly to the tank.
  • the selector includes a low load condition or high load condition detecting camera from whose signal the decision to switch is derived.
  • the selector is actuated by a vehicle operator visually detecting the low load condition or condition to preclude hydraulic fluid from being pumped by the pump in the presence of the low load condition.
  • the electrohydraulic lifting device is fundamentally designed so that energy is recovered only during a high-load condition during lowering.
  • the solenoid switching valve is a 3/2-way solenoid valve, which connects the pilot line to a tank line in the shut-off position to z. B. due to leakage no pilot pressure to arise.
  • a pressure compensator is arranged in the discharge line, which then assists the 3/2-way switching valve when the hydraulic medium is discharged directly to the tank.
  • the lifting valve is expediently a proportional pressure regulating valve which allows sensitive control of the desired lowering speed.
  • a lowering throttle which possibly fulfills the function of a hose breakage valve.
  • An electrohydraulic lifting device H for example, in a battery-powered industrial truck, in particular a forklift truck, arranged to actuate at least one main consumer V, for example a lifting cylinder for a mast 1.
  • the main consumer V is secured by a Senkdrossel 2 when connecting its working line 3.
  • the working line 3 branches at a node 4 in FIG a lifting strand 5 and a Senkstrang 9.
  • To the lifting strand 5 is a driven by a motor M pump 6 is connected, which in turn is connected to a tank T via a tank-blocking check valve 10.
  • the pump 6 can operate in pumping mode, and also as a motor.
  • the electric motor M can recover 6 electrical energy in motor operation of the pump.
  • a supply and distribution controller 7 is arranged, which supplies the hydraulic medium as needed in the lifting strand 5 and / or a supply line 8 possibly provided not shown auxiliary consumers.
  • a proportional pressure regulating valve 15 with a proportional magnet 16 is arranged to regulate the lifting speed. The pressure control valve 15 is assisted when lifting if necessary by a speed control of the pump 6.
  • a proportional pressure regulating valve 17 with a proportional magnet 18 is arranged downstream of the node 4 for regulating the lowering speed. Downstream of the proportional pressure control valve 17 is located in the Senkstrang a 3/2-way switching valve 19 which is pressure-dependent switchable, and the Senkstrang 9 in a drain line 11 to a node 12 in a tank line 13 and a Nutzsenktechnisch 10 to the suction side of the pump 10th bifurcates.
  • the 3/2-way switching valve 19 is acted upon by a spring 20 in the direction of a switching position in which the Senkstrang 9 connected to the drain line 11 and the Nutzsenk effet 10 is shut off.
  • the 3/2-way switching valve 19 is acted upon to another switch position in which the Senkstrang 9 connected to the Nutzsenktechnisch 10 and the drain line 11 is shut off.
  • the spring 20 is set in relation to the pilot pressure in the pilot line 21 'to a lowering pressure threshold representing a low load condition of the main consumer V. D. h., Starting from almost no Senk réelle until reaching the Senk réelle threshold, the 3/2-way switching valve 19 is held in the switching position in which the Senkstrang 9 is connected to the drain line 11, and is the entire during the lowering process displaced hydraulic medium passed directly into the tank. Exceeds the pilot pressure in the pilot line 21 'the Senkdruckschwellwert the spring 20, then the 3/2-way switching valve 19 is switched pressure-dependent in the other switching position, and the Senkstrang 9 is connected to the Nutzsenktechnisch 10. The hydraulic medium displaced during the lowering process is led completely through the pump 6 in order to recover energy.
  • a pressure compensator 23 Downstream of the 3/2-way switching valve is located in the discharge line 11, a pressure compensator 23 which is acted upon in the direction of the free passage position by a control spring 24 and a pilot line 25 to the tank pressure, and in the opposite direction via a pilot line 16 from the drain line 10 is loaded.
  • the pressure compensator 23 assisted in a low load condition the 3/2-way switching valve 19 and the proportional pressure control valve 17 in a lowering operation.
  • a system pressure limiting valve 14 is arranged between the lifting strand 5 and the tank line 13.
  • the electro-hydraulic lifting device H is switched at Senkenselfbsttätig between the low load condition and the high load condition of the main consumer V.
  • the electro-hydraulic lifting device H according to Fig. 2 an option to selectively toggle between the low load condition and the high load condition of the main consumer V.
  • Fig. 2 Different from Fig. 1 branches in Fig. 2 the pilot line 21 'for the 3/2-way switching valve 19 from a node 27 in the Senkstrang 9 upstream of the proportional pressure control valve 17 from.
  • the pilot control line 21 ' is in Fig. 2 additionally arranged a magnetic switching valve 30 that by means of a magnet 31 between a passage position and a shut-off position of the pilot line 21 'is switched.
  • the pilot line 21 ' When de-energized magnet 31, the pilot line 21 'is shut off, and the leading to the 3/2-way switching valve 19 portion of the pilot line 21' is relieved via a line 29 to a node 28 in the tank line.
  • the pilot control line 21 ' is switched to passage, and the pilot control line 29 is shut off.
  • the 3/2-way switching valve 19 thus responds to a pilot pressure, which is tapped off in the positive flow line 9 upstream of the proportional pressure control valve 17.
  • the spring 20 of the 3/2-way switching valve 19 is designed for a low load condition of the main consumer V, so that the switching valve 19 as long as the drain line 11 and the tank line 13 connects until the pilot pressure to one has increased by the spring 20 certain threshold.
  • the further structure corresponds to that of Fig. 1 ,
  • a selector 33 and 34 are provided, with which the solenoid-switching valve 30 is actuated.
  • This selector 34 is for example a pressure transducer or pressure switch, which causes the corresponding energization of the magnet 31 as soon as the lowering pressure upstream of the control valve 17, z. B. represents a high load condition or a low load condition.
  • the selector device 33 may be equipped, for example, with a camera that determines the low-load condition or high-load condition, for example, on the mast 1, and causes the energization of the magnet 31, for example via a control line 32.
  • the selector 33 could in a simple embodiment alternatively or additively have manually operable input elements 35, which then used by the driver when he detects a low-load condition, for example, on the mast 1 with visual inspection.
  • the pump 6 only needs to be driven when a lifting operation of the main consumer V is to be controlled and / or secondary consumers, not shown, are to be supplied. If, during a lowering process, hydraulic medium is displaced with sufficient pressure and volume flow (high-load condition), then this hydraulic medium is conducted entirely through the pump 6 in order to recover energy. If, on the other hand, a low-load condition of the main consumer V is present, then the pump 6, provided that secondary consumers are not to be supplied at the same time, is not driven, but the displaced hydraulic medium is discharged directly into the tank T.

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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)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)
EP20070021578 2007-11-06 2007-11-06 Dispositif de levage électrohydraulique Expired - Fee Related EP2058270B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20070021578 EP2058270B1 (fr) 2007-11-06 2007-11-06 Dispositif de levage électrohydraulique
DE200750003962 DE502007003962D1 (de) 2007-11-06 2007-11-06 Elektrohydraulische Hubvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070021578 EP2058270B1 (fr) 2007-11-06 2007-11-06 Dispositif de levage électrohydraulique

Publications (2)

Publication Number Publication Date
EP2058270A1 true EP2058270A1 (fr) 2009-05-13
EP2058270B1 EP2058270B1 (fr) 2010-05-26

Family

ID=39272494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070021578 Expired - Fee Related EP2058270B1 (fr) 2007-11-06 2007-11-06 Dispositif de levage électrohydraulique

Country Status (2)

Country Link
EP (1) EP2058270B1 (fr)
DE (1) DE502007003962D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333351A1 (fr) 2009-12-11 2011-06-15 HAWE Hydraulik SE Module de levage hydroélectrique
EP2660184A1 (fr) * 2010-12-28 2013-11-06 Sunward Intelligent Equipment Co., Ltd. Système de production d'électricité à régénération d'énergie applicable à un véhicule pour le chargement, le déchargement et le transport
EP3133043A1 (fr) 2015-08-18 2017-02-22 HAWE Hydraulik SE Module de levage
EP3171039A1 (fr) 2015-11-18 2017-05-24 HAWE Hydraulik SE Module de levage hydraulique presentant une fonction de levage et d'abaissement
DE102018104586A1 (de) * 2018-02-28 2019-08-29 Jungheinrich Aktiengesellschaft Flurförderzeug mit mindestens einem hydraulischen Masthubzylinder
EP3839269A1 (fr) * 2019-12-20 2021-06-23 Dana Motion Systems Italia S.R.L. Système hydraulique avec récupération d'énergie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512072A (en) 1967-11-13 1970-05-12 Allis Chalmers Mfg Co Elevated load potential energy recovery in an electric truck
DE4324464A1 (de) * 1993-07-21 1995-01-26 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
EP0669281A1 (fr) 1994-01-29 1995-08-30 Jungheinrich Aktiengesellschaft Dispositif de levage hydraulique pour chariots de manutention actionnés par batterie
EP1067296A1 (fr) 1999-07-06 2001-01-10 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Module de levage électrohydraulique
DE10010670A1 (de) 2000-03-04 2001-09-13 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512072A (en) 1967-11-13 1970-05-12 Allis Chalmers Mfg Co Elevated load potential energy recovery in an electric truck
DE4324464A1 (de) * 1993-07-21 1995-01-26 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
EP0669281A1 (fr) 1994-01-29 1995-08-30 Jungheinrich Aktiengesellschaft Dispositif de levage hydraulique pour chariots de manutention actionnés par batterie
EP1067296A1 (fr) 1999-07-06 2001-01-10 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Module de levage électrohydraulique
DE10010670A1 (de) 2000-03-04 2001-09-13 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333351A1 (fr) 2009-12-11 2011-06-15 HAWE Hydraulik SE Module de levage hydroélectrique
EP2660184A1 (fr) * 2010-12-28 2013-11-06 Sunward Intelligent Equipment Co., Ltd. Système de production d'électricité à régénération d'énergie applicable à un véhicule pour le chargement, le déchargement et le transport
EP2660184A4 (fr) * 2010-12-28 2014-09-17 Sunward Intelligent Equipment Système de production d'électricité à régénération d'énergie applicable à un véhicule pour le chargement, le déchargement et le transport
US9422949B2 (en) 2010-12-28 2016-08-23 Sunward Intelligent Equipment Co., Ltd. Energy-recovery generation system for handling and carrying electric vehicle
EP3133043A1 (fr) 2015-08-18 2017-02-22 HAWE Hydraulik SE Module de levage
EP3171039A1 (fr) 2015-11-18 2017-05-24 HAWE Hydraulik SE Module de levage hydraulique presentant une fonction de levage et d'abaissement
DE102018104586A1 (de) * 2018-02-28 2019-08-29 Jungheinrich Aktiengesellschaft Flurförderzeug mit mindestens einem hydraulischen Masthubzylinder
US11377334B2 (en) 2018-02-28 2022-07-05 Jungheinrich Aktiengesellschaft Industrial truck with at least one hydraulic mast lift cylinder
EP3839269A1 (fr) * 2019-12-20 2021-06-23 Dana Motion Systems Italia S.R.L. Système hydraulique avec récupération d'énergie
US11441585B2 (en) 2019-12-20 2022-09-13 Dana Motion Systems Italia S.R.L. Hydraulic system with energy recovery

Also Published As

Publication number Publication date
DE502007003962D1 (de) 2010-07-08
EP2058270B1 (fr) 2010-05-26

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