EP2058270B1 - Dispositif de levage électrohydraulique - Google Patents

Dispositif de levage électrohydraulique Download PDF

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Publication number
EP2058270B1
EP2058270B1 EP20070021578 EP07021578A EP2058270B1 EP 2058270 B1 EP2058270 B1 EP 2058270B1 EP 20070021578 EP20070021578 EP 20070021578 EP 07021578 A EP07021578 A EP 07021578A EP 2058270 B1 EP2058270 B1 EP 2058270B1
Authority
EP
European Patent Office
Prior art keywords
lowering
valve
line
train
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.)
Expired - Fee Related
Application number
EP20070021578
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German (de)
English (en)
Other versions
EP2058270A1 (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
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Hawe Hydraulik SE
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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
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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 or claim 2.
  • 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 pumped 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.
  • An electrohydraulic lifting device for a battery-powered conveying vehicle in which a 3/3-way control slide is provided for switching between lifting and lowering.
  • the drawstring contains a flow divider valve that switches between a payload line and a line leading directly to the tank, so that the pressure medium flows directly to the tank during a low load condition, whereas a high load condition is used for energy recovery.
  • a flow control valve Downstream of the flow divider valve, a flow control valve which regulates the lowering speed is included in the useful sink line. Since the flow control valve operates only when energy recovery is operated simultaneously, the lowering speed can not be controlled under a low load condition.
  • 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 responds only to pressure-dependent lowering and connects by the Senkstrang pilot pressure against the spring only the Senkstrang with Nutzsenktechnisch, if the Senkdruck threshold, regardless of possibly simultaneously supplied to auxiliary consumers, also is actually achieved, no hydraulic medium is passed through the pump in a low-load condition, but drained all the hydraulic medium directly to the tank. Even with extremely low lowering speed, in the low load condition, the pump need not be driven to control the desired lowering speed. As a result, a loss of energy is avoided in a low-load condition when lowering.
  • the 3/2-way switching valve only supplies the hydraulic medium directly to the tank when, after detecting the low-load condition, the solenoid switching valve disposed between the positive sequence and the 3/2-way switching valve in the pilot line switches the pilot line 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 3/2-way switching valve is acted upon by a spring by the pilot pressure, which is tapped downstream of the lowering valve, so that even then no hydraulic medium is passed through the pump when upstream of the lowering valve is higher pressure, However, the pressure downstream of the lowering valve is not sufficient for energy recovery.
  • the spring is set in relation to the pilot pressure in the pilot line to a lowering pressure threshold representing a low load condition of the main consumer. That is, starting from almost no Senkbuch until reaching the Senk réelle threshold, the 3/2-way switching valve is held in the switching position in which the Senkstrang is connected to the drain line, and is the entire, displaced during the lowering hydraulic medium directly directed into the tank.
  • the 3/2-way switching valve is switched to the other switching position as a function of pressure, and the sunk rod is connected to the useful lowering pipe.
  • the hydraulic medium displaced during the lowering process is led completely through the pump in order to recover energy.
  • 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 driver visually detecting the low load condition or condition to preclude hydraulic medium from being pumped by the low load condition preference.
  • 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 312-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 312-way switching valve 19 which is pressure-dependent switchable and the Senkstrang 9 branches off into a drain line 11 to a node 12 in a tank line 13 and a Nutzsenk effet 10 to the suction side of the pump 10.
  • 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 312-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 thoroughlysteuem and / or auxiliary 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)

Claims (9)

  1. Dispositif de levage électro-hydraulique (H) pour des chariots de manutention alimentés par batteries, en particulier des chariots élévateurs, comprenant au moins un consommateur principal (V) réalisé sous forme de vérin hydraulique, qui peut être alimenté pour le levage, à partir d'une pompe (6) entraînée par un moteur (M) et protégée par une soupape anti-retour (10) en direction du réservoir (T), par l'intermédiaire d'une soupape de levage (15) disposée dans une ligne de levage (5), avec une soupape d'abaissement (17) disposée dans une ligne d'abaissement (9), la ligne d'abaissement (9) se ramifiant en aval de la soupape d'abaissement, dans un distributeur 3/2 voies (19), en une conduite d'abaissement utile (10) menant au côté aspiration de la pompe et en une conduite d'échappement (11) menant directement au réservoir (T), et la pompe (6) étant entraînable sélectivement par moteur par l'intermédiaire de la conduite d'abaissement utile (10) en tant que récupération d'énergie, caractérisé en ce que le distributeur 3/2 voies (19) peut être sollicité à partir de la ligne d'abaissement (9) par une pression pilote en direction d'une première position de commutation, qui relie la ligne d'abaissement à la conduite d'abaissement utile (10), et par un ressort (20) en direction d'une seconde position de commutation, qui relie la ligne d'abaissement (9) à la conduite d'échappement (11), que le ressort (20) est calculé en rapport avec la pression pilote sur un seuil de pression d'abaissement prédéfini, qui correspond à une condition de charge basse du consommateur principal (V), qu'une conduite pilote (21') pour la pression pilote, menant au distributeur 3/2 voies (19), est en dérivation de la ligne d'abaissement (9) en amont de la soupape d'abaissement (17), et qu'une soupape de commande magnétique (30) est disposée dans la conduite pilote (21'), laquelle soupape est commutable entre une position de passage et une position d'arrêt et dont l'aimant (31) est raccordé à un dispositif de sélection automatique ou manuel (33, 34), qui alimente en courant ou met hors courant l'aimant (31) en fonction d'une détection de la condition de charge basse ou d'une condition de charge haute du consommateur principal (V).
  2. Dispositif de levage électro-hydraulique (H) pour des chariots de manutention alimentés par batteries, en particulier des chariots élévateurs, comprenant au moins un consommateur principal (V) réalisé sous forme de vérin hydraulique, qui peut être alimenté pour le levage à partir d'une pompe (6), entraînée par un moteur (M) et protégée par une soupape anti-retour (10) en direction du réservoir (T), par l'intermédiaire d'une soupape de levage (15) disposée dans une ligne de levage (5), avec une soupape d'abaissement (17) disposée dans une ligne d'abaissement (9), la ligne d'abaissement (9) se ramifiant en aval de la soupape d'abaissement, dans un distributeur 3/2 voies (19), en une conduite d'abaissement utile (10) menant au côté aspiration de la pompe et en une conduite d'échappement (11) menant directement au réservoir (T) et la pompe (6) étant entraînable sélectivement par moteur par l'intermédiaire de la conduite d'abaissement utile (10) en tant que récupération d'énergie, caractérisé en ce que le distributeur 3/2 voies (19) peut être sollicité à partir de la ligne d'abaissement (9) par une pression pilote en direction d'une première position de commutation, qui relie la ligne d'abaissement à la conduite d'abaissement utile (10), et par un ressort (20) en direction d'une seconde position de commutation, qui relie la ligne d'abaissement (9) à la conduite d'échappement (11), que le ressort (20) est calculé en rapport avec la pression pilote sur un seuil de pression d'abaissement prédéfini, qui correspond à une condition de charge basse du consommateur principal (V), qu'une conduite pilote (21) pour la pression pilote, menant au distributeur 3/2 voies (19), est en dérivation de la ligne d'abaissement (9) entre la soupape d'abaissement (17) et le distributeur 3/2 voies (19), et que le distributeur 3/2 voies (19) répond exclusivement en fonction de la valeur de la pression pilote.
  3. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce que le dispositif de sélection (34) présente un convertisseur de pression ou manostat dans la ligne d'abaissement (9).
  4. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce que le dispositif de sélection (33) présente une caméra, qui détecte la condition de charge basse ou la condition de charge haute, en particulier une caméra surveillant le mât de levage (1).
  5. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce que le dispositif de sélection (33) est actionnable manuellement par un conducteur du chariot, qui détecte visuellement la condition de charge basse ou la condition de charge haute.
  6. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce que la soupape de commande magnétique (30) est une électrovanne 3/2 voies, qui relie la conduite pilote (21') à la conduite (13) du réservoir dans la position d'arrêt.
  7. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce qu'une balance de pression (23) est disposée dans la conduite d'échappement (11), laquelle balance est sollicitée dans la direction de passage par un ressort de réglage et par la pression du réservoir, et dans la direction d'étranglement par la pression de sortie du distributeur 3/2 voies (19).
  8. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce que la soupape d'abaissement (17) est une soupape de régulation de pression proportionnelle.
  9. Dispositif de levage électro-hydraulique suivant la revendication 1, caractérisé en ce que le consommateur principal (V) est protégé par un étranglement d'abaissement (2).
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 EP2058270A1 (fr) 2009-05-13
EP2058270B1 true EP2058270B1 (fr) 2010-05-26

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EP20070021578 Expired - Fee Related EP2058270B1 (fr) 2007-11-06 2007-11-06 Dispositif de levage électrohydraulique

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333351B1 (fr) 2009-12-11 2013-03-20 HAWE Hydraulik SE Module de levage hydroélectrique
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
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

Family Cites Families (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
DE4324464C2 (de) * 1993-07-21 1997-03-27 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
DE4402653C2 (de) 1994-01-29 1997-01-30 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
DE29911686U1 (de) 1999-07-06 1999-09-16 Heilmeier & Weinlein Elektrohydraulischer Hubmodul
DE10010670C2 (de) 2000-03-04 2003-11-06 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge

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Publication number Publication date
EP2058270A1 (fr) 2009-05-13
DE502007003962D1 (de) 2010-07-08

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