EP1780171B1 - Chariot élévateur avec agencement de jambe de support - Google Patents

Chariot élévateur avec agencement de jambe de support Download PDF

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Publication number
EP1780171B1
EP1780171B1 EP06021245A EP06021245A EP1780171B1 EP 1780171 B1 EP1780171 B1 EP 1780171B1 EP 06021245 A EP06021245 A EP 06021245A EP 06021245 A EP06021245 A EP 06021245A EP 1780171 B1 EP1780171 B1 EP 1780171B1
Authority
EP
European Patent Office
Prior art keywords
mast
lifting
hydraulic cylinders
path difference
pump
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
EP06021245A
Other languages
German (de)
English (en)
Other versions
EP1780171A2 (fr
EP1780171A3 (fr
Inventor
Jessica Finke
Paul Rickers
Henrik Schröder
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.)
Jungheinrich AG
Original Assignee
Jungheinrich AG
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Filing date
Publication date
Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP1780171A2 publication Critical patent/EP1780171A2/fr
Publication of EP1780171A3 publication Critical patent/EP1780171A3/fr
Application granted granted Critical
Publication of EP1780171B1 publication Critical patent/EP1780171B1/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
    • 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
    • B66F9/08—Masts; Guides; Chains

Definitions

  • the invention relates to a mast, in particular for a high-bay stacker according to claim 1.
  • Height-adjustable masts are e.g. known as part of industrial trucks with high-lift equipment in a variety of designs. With the help of masts to be transported loads are recorded and stored at different altitudes, the lifting load is moved substantially vertically.
  • Such a mast consists in principle of an outer frame in which moves directly a load-carrying means. Such a construction is relatively rare. In most cases, one or more driving masts move in the stationary mast. In a single and double telescopic mast, this is an inner mast. In a triple-telescopic mast, these are two, and in the quad telescopic mast, three inner masts.
  • the individual mast frames consist of two lateral support profiles, which are connected at the top and bottom by transverse struts.
  • the transmission of the bending load resulting from the lifting load is carried out between the nested mast frame normally via rollers, which are arranged at the top and bottom of the frame profiles.
  • the drive for the height adjustment is usually by means of hydraulic lifting cylinders and chains that produce a relative movement between the mast frame.
  • the construction of the mast frame is created so that the extended mast is rigid in its main load direction, so that it deforms as little as possible by the bending moment of a load at a higher altitude. Too much deformation leads to a shift of the center of gravity and thus to increase the force acting on the truck tipping moment. As a result, the stability of the vehicle is adversely affected.
  • the necessary bending stiffness is achieved by selecting lifting frame profiles with reasonably large moments of inertia.
  • a lateral bending In addition to the main bending load can also occur a lateral bending, which is caused by an eccentric center of gravity of the lifting load or by dynamic lateral mass forces. Due to the resulting lateral bending of the mast, the lateral Hublasthebelarm is increased and thus increases the lateral tilting moment.
  • the rigidity of the mast frame with respect to lateral bending is usually achieved by connecting the two lateral support profiles of the mast frame by massive transverse stiffeners (ladder-shaped). These transverse stiffeners obstruct the view through the mast frame and increase its weight.
  • Out EP 1 528 035 A2 It is known to monitor the inclination of a mast from a position sensor and to control the pressure in the hydraulic cylinders so that the inclination is compensated.
  • Out DD 30489 It has become known to control the amount of fluid to the lifting cylinders of a lifting mast load-dependent.
  • the invention has for its object to provide a mast, especially for a high-bay stacker, in which a lateral bending is prevented from the outset.
  • a control device for the two linear actuators is provided, with which a path difference of the stroke of the linear actuators is measured and the linear actuators are controlled so that the path difference remains zero.
  • the supply of equal volumes of pressure medium is ensured by a quantity divider are arranged between the hydraulic pressure source and the hydraulic cylinders, via which the hydraulic cylinders are each supplied with the same pressure medium volume.
  • Hydraulic flow dividers do not work well in practice, so that the same stroke on the hydraulic cylinders can not be guaranteed completely safe. Because the pressure medium is compressible to some extent, and in the piping system compliances of the pressure medium-carrying parts are present, such as in pipes and hoses. For practical applications, such flow divider can work satisfactorily.
  • Downstream of the flow divider are the lines to the hydraulic cylinders on one in the speed controllable pump are connected and the pump is driven at a path difference of the hydraulic cylinder or an inclination angle of the mast from a motor, wherein the direction of rotation of the motor is dependent on the sign of the path difference or the inclination angle.
  • the speed and conveying direction of the pump are predetermined by an electronic control, which measures the travel of each lifting cylinder or the inclination angle of the mast with a sensor device.
  • a throttle can be connected in parallel to the equalizing pump, which ensures that the pump is not operated at unacceptably low speeds.
  • a shut-off valve can be provided in series with the balance pump, which is opened only during operation of the balance pump. In case of failure of the balancing pump, this valve is closed, so that a pressure compensation and thus a loss of stabilizing effect is avoided. In the case of a path difference or an inclination angle from the lifting mast, the compensating pump is then activated in such a way that the path difference or the angle of inclination is minimized.
  • dynamic deformations such as e.g. When cornering the truck occur, to reduce within certain limits.
  • a controllable three / three-way valve with two input ports is located on the master cylinder, while an output port is connected to the tank.
  • the control device controls in accordance with the path difference or the inclination angle, the valve so that one of the two hydraulic cylinders is connected to the tank.
  • a possible difference in the stroke of the Hydraulic cylinder is compensated by allowing fluid to flow into the tank through the valve until the stroke of both cylinders is equal again.
  • each lifting cylinder is associated with a controllable lifting / lowering valve, which are located at the output of a hydraulic pump and the control device in accordance with the path difference or the inclination angle of one of the two lifting / lowering valves so controls that the path difference or the inclination angle becomes zero, respectively.
  • Fig. 1 schematically shown a mast, with a stationary mast frame 10, which can be attached to a high-bay forklift.
  • a stationary mast frame 10 which can be attached to a high-bay forklift.
  • two hydraulic cylinders 14, 16 are based, which are connected to an upper cross member 18 of a mast frame 20.
  • arrows 22 and 24 different lifting forces are to be indicated, which lead to a lateral bending moment 26. In the embodiments described below, a deflection is to be prevented despite a bending moment generated by the load.
  • Fig. 2 can be seen that the hydraulic cylinders 14, 16 are supplied via a so-called flow or flow divider 30 with pressure medium.
  • the flow divider ensures that both hydraulic cylinders 14, 16 regardless of their load in each case the same pressure medium volume is supplied, so that the hydraulic cylinders 14, 16 execute the same stroke paths.
  • Fig. 3 the hydraulic cylinders 14, 16 are connected via the flow divider 30 to a hydraulic pump.
  • a parallel connection 32 between the supply lines to the hydraulic cylinders 14, 16 is provided, in which a small controllable pump 34 is arranged, which is driven by an electric motor 36.
  • Parallel to the pump 34 is a throttle 38.
  • the circuit arrangement shown operates as follows.
  • the flow divider 30 should ensure that the hydraulic cylinders 14, 16 are each supplied with equal volumes. For various reasons, this is not always guaranteed.
  • a sensor device not shown measures the strokes of the hydraulic cylinders 14, 16. At a difference between the measured strokes, the electric motor 36 is driven and drives the pump 34 in one direction so that the measured path difference is made zero. Once the path difference is zero, the motor 36 is turned off. During this Operation, the valve 40 is opened, which is otherwise closed when the pump 34 is not operating, in order not to jeopardize the uniform supply of the hydraulic cylinders 14, 16 via the flow divider 30 in case of failure of the pump 34.
  • the throttle 38 ensures that the pump is not operated at impermissibly low speeds.
  • a fault of the flow divider 30 can be compensated by means of a three / three-way valve 42, the two inputs are respectively connected to the hydraulic cylinders 14, 16 and whose output is connected to a tank 44. With a stroke difference, the valve 42 is opened, so that one of the two hydraulic cylinders 14, 16 as long pressure fluid is discharged into the tank 44 until the stroke of both cylinders is equal again.
  • the required regulation corresponds to that according to Fig. 4 ,
  • each hydraulic cylinder 14, 16 is associated with a lifting and lowering valve 46, 48, which are driven by an electronic unit, not shown. With the help of a sensor, which is not shown, the stroke paths of the hydraulic cylinders 14, 16 are measured.
  • the control of the valves 46, 48 via the control device is such that the supply of pressure medium from a pump 50 is different until the Hubwegdifferenz has become zero again.

Landscapes

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

Claims (8)

  1. Mât de levage, en particulier pour un chariot élévateur pour magasin à hauts rayonnages, avec un mât fixe et avec au moins un tronçon de mât télescopique et avec deux entraînements de levage (14, 16) disposés latéralement en parallèle sur le mât et permettant de déployer le tronçon de mât du mât fixe, et avec une commande pour les entraînements de levage, caractérisé en ce qu'il est prévu pour les deux entraînements de levage (14, 16) un dispositif de régulation à l'aide duquel une différence de course concernant les courses de levage des entraînements de levage est mesurée; et les entraînements de levage sont commandés de telle manière que la différence de course reste égale à zéro.
  2. Mât de levage selon la revendication 1, caractérisé en ce que les entraînements de levage ont deux moteurs, chacun avec un entraînement à broche, et la différence des courses est déterminée en mesurant l'angle de rotation des entraînements à broche.
  3. Mât de levage selon la revendication 1, caractérisé en ce que les entraînements de levage sont des cylindres hydrauliques (14, 16) qui se laissent raccorder à une source de fluide hydraulique, et le débit volumétrique aux cylindres hydrauliques (14, 16) est commandé de telle manière que les courses de levage des cylindres hydrauliques (14, 16) sont égales.
  4. Mât de levage, en particulier pour un chariot élévateur pour magasin à hauts rayonnages, avec un mât fixe et avec au moins un tronçon de mât télescopique et avec deux cylindres hydrauliques disposés latéralement en parallèle et permettant de déployer le tronçon de mât du mât fixe, et avec une commande pour les cylindres hydrauliques, caractérisé en ce qu'un diviseur de débit ou de flux (30) est disposé entre la source de pression hydraulique et les cylindres hydrauliques (14, 16), à travers duquel les cylindres hydrauliques (14, 16) sont alimentés avec des volumes de fluide hydraulique égaux, et qu'en aval d'un diviseur de débit ou de flux (30), les conduits aux cylindres hydrauliques (14, 16) sont raccordés à travers une pompe (34) réglable dans sa vitesse de rotation, et que la pompe (34) est entraînée par un moteur 36 en cas d'une différence de course des cylindres hydrauliques (14, 16) ou un angle d'inclinaison du mât de levage, le sens de rotation du moteur (36) dépendant du signe de la différence de course ou respectivement de l'angle d'inclinaison.
  5. Mât de levage selon la revendication 4, caractérisé en ce qu'un étrangleur (38) est connecté en parallèle à la pompe (34).
  6. Mât de levage selon la revendication 4 ou 5, caractérisé en ce qu'une soupape de commande (40) est disposée dans le conduit de raccord entre les conduits, qui est normalement fermé, mais est ouverte pendant la marche de la pompe (34).
  7. Mât de levage selon la revendication 3 ou 4, caractérisé en ce qu'en parallèle au diviseur de débit ou de flux (30), une soupape commandable à trois/trois voies est appliquée aux cylindres hydrauliques avec deux raccords d'entrée, pendant qu'un raccord de sortie est raccordé au réservoir (44), et le dispositif de régulation commande la soupape (42) conformément à la différence de course ou de l'angle d'inclinaison de telle manière qu'un des deux cylindres hydrauliques (14, 16) est raccordé au réservoir (44).
  8. Mât de levage selon la revendication 3, caractérisé en ce que une soupape de levage/abaissement (46, 48) commandable est associée à chaque cylindre hydraulique (14, 16), les soupapes étant disposées dans la sortie d'une pompe hydraulique (50), et que le dispositif de régulation commande une des deux soupapes de levage/abaissement (46, 48) conformément à la différence de course de telle manière que la différence de course devient zéro.
EP06021245A 2005-10-22 2006-10-10 Chariot élévateur avec agencement de jambe de support Expired - Fee Related EP1780171B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005050733A DE102005050733A1 (de) 2005-10-22 2005-10-22 Hubmast für Stapler

Publications (3)

Publication Number Publication Date
EP1780171A2 EP1780171A2 (fr) 2007-05-02
EP1780171A3 EP1780171A3 (fr) 2007-06-06
EP1780171B1 true EP1780171B1 (fr) 2013-02-20

Family

ID=37831746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06021245A Expired - Fee Related EP1780171B1 (fr) 2005-10-22 2006-10-10 Chariot élévateur avec agencement de jambe de support

Country Status (4)

Country Link
US (1) US20070089934A1 (fr)
EP (1) EP1780171B1 (fr)
CN (1) CN1994855B (fr)
DE (1) DE102005050733A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007042878A1 (de) 2007-09-08 2009-03-12 Jungheinrich Aktiengesellschaft Hochhubflurförderzeug
EP2465812B1 (fr) * 2010-12-16 2013-11-06 BT Products AB Camion industriel comportant un mât extensible
CN103288008A (zh) * 2012-02-26 2013-09-11 吴涛慧 一种长辊轴装卸车
CN104595480B (zh) * 2015-01-05 2018-06-08 安徽维麦重工股份有限公司 一种内燃液力叉车传动安全限制***
DE102017121818A1 (de) 2017-09-20 2019-03-21 Jungheinrich Ag Flurförderzeug, hydraulisches System für ein Flurförderzeug und Verfahren zum Betreiben eines hydraulischen Systems

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD30489A (fr) *
US3782503A (en) * 1972-12-14 1974-01-01 Anderson Clayton & Co Mast stabilizer for lift trucks
EP0050110A4 (fr) * 1980-04-14 1982-10-07 Towmotor Corp Ensemble de chariot et de mat de levage de charge.
US4337959A (en) * 1980-06-05 1982-07-06 International Harvester Co. Self-leveling and height control hydraulic system
US4335894A (en) * 1980-06-05 1982-06-22 International Harvester Co. Implement level lift system with rephasing valves
US4395189A (en) * 1981-02-02 1983-07-26 Munten Gerard H Dual mast lift truck for unbalanced loads and the like
IT1187790B (it) * 1985-06-24 1987-12-23 Corghi Elettromecc Spa Impianto idraulico di comando per ponti sollevatori di automezzi in genere
US4782920A (en) * 1987-02-04 1988-11-08 Cascade Corporation Load-lifting mast especially adapted for use with automatically-guided vehicles
SE469485B (sv) * 1991-11-29 1993-07-12 Jan Lindholm Foerfarande och floedesregleringsventilaggregat foer floedesbalansering
NL9200589A (nl) * 1992-03-30 1993-10-18 Meijer Sjoerd Hydraulische inrichting met gelijklopende vijzels.
US5335499A (en) * 1992-09-24 1994-08-09 Viking Engineering & Development, Incorporated Multiple hydraulic actuators with series/parallel operation
FR2749630B1 (fr) * 1996-06-07 1998-10-09 Lohr Ind Dispositif de manoeuvre d'une structure porteuse a partir d'un couple de vis portant chacune un ecrou de translation
CN2291407Y (zh) * 1996-11-22 1998-09-16 刘水章 用于电动平衡重式叉车的双液压马达驱动装置
EP0866027B1 (fr) * 1997-03-21 2004-05-26 Kabushiki Kaisha Toyota Jidoshokki Appareil de contrôle hydraulique de véhicules industriels
JPH11171492A (ja) * 1997-12-15 1999-06-29 Toyota Autom Loom Works Ltd 産業車両におけるデータ設定装置及び産業車両
US6189432B1 (en) * 1999-03-12 2001-02-20 Hunter Engineering Company Automotive lift hydraulic fluid control circuit
GB2387372B (en) * 2002-04-10 2005-06-29 Lansing Linde Ltd Industrial truck
DE10321487A1 (de) * 2003-05-13 2004-12-02 Still Wagner Gmbh & Co. Kg Schubmaststapler
DE10342436B3 (de) * 2003-09-11 2005-03-17 Jungheinrich Ag Pumpenanordnung für Handgabelhubwagen
DE10349123A1 (de) 2003-10-22 2005-05-19 Still Wagner Gmbh & Co Kg Hubwerk, insbesondere für einen Hochregalstapler

Also Published As

Publication number Publication date
DE102005050733A1 (de) 2007-04-26
EP1780171A2 (fr) 2007-05-02
CN1994855B (zh) 2013-11-13
EP1780171A3 (fr) 2007-06-06
CN1994855A (zh) 2007-07-11
US20070089934A1 (en) 2007-04-26

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