EP2508465B1 - Chariot de manutention, en particulier chariot gerbeur doté d'un cadre de levage - Google Patents

Chariot de manutention, en particulier chariot gerbeur doté d'un cadre de levage Download PDF

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Publication number
EP2508465B1
EP2508465B1 EP20120002511 EP12002511A EP2508465B1 EP 2508465 B1 EP2508465 B1 EP 2508465B1 EP 20120002511 EP20120002511 EP 20120002511 EP 12002511 A EP12002511 A EP 12002511A EP 2508465 B1 EP2508465 B1 EP 2508465B1
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EP
European Patent Office
Prior art keywords
mast
lowering
throttle valve
free
lift cylinder
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.)
Active
Application number
EP20120002511
Other languages
German (de)
English (en)
Other versions
EP2508465A1 (fr
Inventor
Thomas Stolten
Christoph Behncke
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
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Jungheinrich AG
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Publication of EP2508465A1 publication Critical patent/EP2508465A1/fr
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Publication of EP2508465B1 publication Critical patent/EP2508465B1/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
    • 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
    • B66F9/0755—Position control; Position detectors

Definitions

  • the present invention relates to an industrial truck, in particular a reach truck with a mast.
  • Forklifts with an extendable mast have a fixed stroke sequence, so that during lifting first a lifting of the lifting device takes place in a free lift, to which a mast lift adjoins.
  • the load receiving means is raised or lowered without the mast extending. This has the advantage that the load can be lifted without changing the headroom of the truck.
  • the mast stroke begins, where the mast extends to further lift the load handler.
  • the lift cylinder for the free lift has a larger, effective piston area, as provided for the mast lift mast stroke. Under the influence of the oil pressure results from the larger piston surface, a force that causes the first free-lifting cylinder extends. If the free lift is fully extended, the mast stroke is actuated by the mast lift cylinder.
  • Out DE 101 25 351 A1 is a hydraulic arrangement for the lifting cylinder of a truck known.
  • One of the lifting cylinders is provided as a first extendable primary cylinder and has a larger piston diameter than the second lifting cylinder, which is provided as a subsequently extendable secondary cylinder.
  • a pressure-dependent shut-off valve to the mast lifting cylinder.
  • Out DE OS 29 30 316 is a multi-telescopic mast known in which the transition from the free lift in the mast lift temporarily a parallel operation of free lift and mast lift is done together.
  • Out DE 197 10 556 A1 is an extendable mast construction for a truck with a carriage-proof mast known in which the free-lifting cylinder builds up a gradually increasing hydraulic back pressure before the end of its extension stroke, which is such that the pressure increase at the lift cylinders is sufficient to extend the mast cylinder before the Free-lift cylinder has reached its death point.
  • a hydraulic mast has become known in which a hydraulically actuated mast with a mast lift and a free-lifting cylinder is controlled in each case via electrically controlled proportional valves.
  • a transition region is defined to provide a constant speed for the load support, depending on the height of the load support, in which the proportional valve closes for the free lift via a ramp and the Proportional valve for the mast lift is opened accordingly via a ramp.
  • the control of the two proportional valves is such that a possible uniform transition between free lift and mast lift is achieved during lifting and lowering.
  • WO 2009/141242 A1 is a truck with a multi-stage mast known.
  • a hydraulic valve arrangement is provided, which is controlled in order to compensate for a difference between a detected actual speed of the load-bearing means and a desired speed for the load-bearing means.
  • the hydraulic valve device is equipped for this purpose with at least one adjustable supply valve and with at least one adjustable drain valve.
  • a lowering valve of the mast lifting cylinder is driven complementary to a lowering valve of the free-lifting cylinder in order to achieve a constant lowering speed in the transition region.
  • the invention has for its object to provide a truck with an extendable mast, in which by simple means, a constant lowering speed for lowering the lifting cylinder for the mast stroke and the free lift is achieved.
  • the truck according to the invention is in particular a reach truck with a mast, which has at least one mast movable along the mast. In this case, several masts extend telescopically extendable to form the mast. Furthermore, the truck has a load bearing means, the is movably mounted along the at least one mast. Furthermore, a pressure source is provided for supplying a freehub cylinder cooperating with the load receiving means and a mast lifting cylinder cooperating with the at least one mast. According to the invention, a common throttle valve is provided for the lowering operation of the free-lifting cylinder and the mast-lifting cylinder. Furthermore, a sensor is provided according to the invention, which detects a transition from the mast stroke to the free stroke in a lowering process.
  • a control which controls the throttle valve in response to a detected by the sensor transition from the mast stroke in the free stroke, so that a lowering speed of the free-lifting corresponds to a lowering speed of the mast lift.
  • the truck according to the invention has the advantage that the lowering speed is controlled by a common throttle valve, wherein a sensor that detects, for example, the height of the load support, at a transition of lowering the mast to lower the load supporting means with retracted mast the common throttle valve controls.
  • the invention is based on the idea that a common throttle valve can be provided for the lowering operation of mast lifting and free-lifting cylinders, by the actuation of which a constant lowering speed for the mast stroke and the free lift can be achieved.
  • control of the throttle valve by the controller is electrically such that when lowering the free-lifting a larger maximum flow through the throttle valve is possible.
  • the free lift cylinder has a larger piston area than each of the at least one mast lift cylinder.
  • the larger piston area ensures that the free stroke is first actuated during the lifting process before the mast stroke starts and that, when lowering, the mast stroke is lowered first and the free lift then lowers.
  • the maximum volume flow is increased by the common throttle valve according to the area difference of free-lift and mast lifting, when the sensor responds to a transition from mast lift to free lift during a lowering operation.
  • the senor detects the lifting height of the load supporting means in order to detect the transition from the mast stroke to the free stroke at a predetermined lifting height of the load-carrying means.
  • a two-way volumetric flow regulator is provided in a lowering line of the common throttle valve.
  • the two-way volumetric flow regulator may be provided upstream or downstream of the common throttle valve. In one position of the two-way volumetric flow controller, a volumetric flow is blocked when lowering out of the lifting cylinders.
  • the two-way flow regulator is used to prevent uncontrolled lowering in case of failure of the common throttle valve.
  • a temperature compensation for the common throttle valve is provided.
  • the temperature compensation corrects for the control of the common throttle valve temperature influences in the flow.
  • the prerequisite for the compensation of the influence of temperature on the volume flow control is the knowledge about the relationship between volume flow change and temperature change at a constant electrical drive current of the throttle valve.
  • the dependency is represented by volume flow characteristics recorded at different temperatures. The characteristic curves are usually recorded at the same values for pressure and electric current. Based on these characteristics can then be carried out depending on the temperature, a correction of the electric current for driving the common throttle valve to achieve the desired flow rate.
  • the two-way volumetric flow controller is hydraulically controlled by a Senkstoppventil.
  • the lowering stop valve is electrically held in a position in which the two-way volumetric flow controller connects the common throttle valve to a tank.
  • the lowering stop valve switches the two-way volume flow controller such that the lowering line is connected to the common throttle valve with the tank and the volume flow during lowering by the common throttle valve 36 can be controlled.
  • the two-way volumetric flow controller is hydraulically controlled by a Senkstoppventil, wherein the Senkstoppventil occupies a position in a missing electrical voltage in which the two-way volumetric flow controller is hydraulically controlled to a Lowering the lowering of the common throttle valve. This ensures that in case of a fault in the electrical power supply of the truck, the Senkstoppventil hydraulically blocks a lowering line and there is no uncontrolled lowering of the mast and the load bearing means.
  • the single FIGURE shows the hydraulic arrangement of a truck with a free-lifting cylinder 10 and two mast cylinders 12. Further, a further cylinder 14 is shown, via which a mast thrust can be actuated, as required for a reach truck.
  • the lifting cylinders 10, 12, 14 are fed from a common tank 16, from which oil is conveyed via a hydraulic pump 18.
  • a pressure relief valve 22 and a check valve 24 is provided in a first supply line 20, a pressure relief valve 22 and a check valve 24 is provided.
  • a shuttle valve 26 can be switched between a lifting function of the free-lifting cylinder 10 or the mast cylinder 12 and the mast thrust cylinder 14.
  • the free-lift cylinder 10 and the mast lift cylinders 12 are preceded in each case by a pipe rupture guard 28 which, in the event of a line break, blocks the lowering operation, for example when the lowering speed exceeds a speed of 0.6 m / s.
  • the hydraulic fluid initially exits via the pipe rupture protection and is directed into a lowering pipe 30.
  • the lowering pipe 30 has a common, proportional throttle valve 36, which has no mechanically adjustable stroke stop.
  • the common throttle valve 36 is electrically controlled to set the maximum flow through the throttle valve 36.
  • a two-way flow regulator 38 for lowering is over the Sink line 30 and a bypass line 32 connected and arranged downstream of the common throttle valve 36.
  • the bypass line 32 has a shut-off valve 34.
  • an additional Senkstoppventil 42 is provided that shuts off the control pressure to the two-way flow regulator 38 when it is not supplied with electrical voltage.
  • the Senkstoppventil 42 thus terminated by an operation of the two-way flow regulator 38 a lowering operation when the electrical voltage fails. In this way, it is ensured that the common throttle valve 36 whose maximum volume flow is adjusted electrically without mechanical stroke stop, does not lead to an uncontrolled lowering of the lifting cylinder 10 and 12 in case of failure of the voltage.
  • hydraulic oil first exits from the mast lifting cylinders 12 via the lowering line 30 and the common throttle valve 36 and flows back into the tank 16.
  • the volume flow at the common throttle valve 36 is set electrically. If the transition is recognized during lowering from the mast stroke into the free stroke, the volume flow in the common throttle valve 36 is increased corresponding to the cylinder surfaces, so that the free-lifting cylinder 10 is lowered at the same speed as the mast lift cylinders.

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  • 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)
  • Fluid-Pressure Circuits (AREA)

Claims (9)

  1. Chariot de manutention, en particulier chariot gerbeur doté d'un cadre de levage, comportant au moins un mât déplaçable le long de la structure de levage, un porte-charge agencé de façon déplaçable le long de l'au moins un mât, une source de pression (18) pour l'alimentation d'un vérin de levage libre (10) coopérant avec le porte-charge, ainsi que d'un vérin de levage de mât (12) coopérant avec l'au moins un mât, dans lequel il est prévu un capteur capable de détecter un passage du levage libre au levage de mât lors d'une opération d'abaissement,
    caractérisé par
    - un clapet d'étranglement commun (36) pour l'abaissement du vérin de levage libre (10) et de l'au moins un vérin de levage de mât (12), et
    - une commande conçue pour actionner le clapet d'étranglement commun (36) pour une vitesse d'abaissement du vérin de levage libre (10) correspondant à une vitesse d'abaissement de l'au moins un vérin de levage de mât (12), en réponse à un passage du levage de mât au levage libre, détecté par le capteur.
  2. Chariot de manutention selon la revendication 1, caractérisé en ce que la commande est conçue pour actionner électriquement l'ensemble du clapet d'étranglement (36) avec un débit maximal plus élevé que lors de l'abaissement du vérin de levage de mât (12), lors de l'abaissement du vérin de levage libre (10).
  3. Chariot de manutention selon la revendication 2, caractérisé en ce que l'ensemble du clapet d'étranglement (36) comporte un dispositif de compensation de température, le dispositif de compensation de température étant conçu pour corriger l'actionnement du clapet d'étranglement en fonction d'une température détectée.
  4. Chariot de manutention selon la revendication 1 ou 2, caractérisé en ce que le vérin de levage libre (10) présente une plus grande surface de piston que chacun des vérins de levage de mât (12).
  5. Chariot de manutention selon la revendication 4, caractérisé en ce que la commande est conçue pour agrandir le débit maximal par le clapet d'étranglement commun, en fonction d'une différence de surface entre le vérin de levage libre et le vérin de levage de mât (10, 12).
  6. Chariot de manutention selon l'une des revendications 1 à 5, caractérisé en ce que le capteur détermine une hauteur de levage du porte-charge pour détecter un passage du levage de mât au levage libre.
  7. Chariot de manutention selon l'une des revendications 1 à 6, caractérisé en ce qu'un régulateur de débit à deux voies (38) est prévu dans une conduite d'abaissement (30) avec le clapet d'étranglement commun (36).
  8. Chariot de manutention selon la revendication 7, caractérisé en ce que le régulateur de débit à deux voies (38) est actionné de façon hydraulique par un clapet d'arrêt d'abaissement (42), dans lequel le clapet d'arrêt d'abaissement (42) est maintenu électriquement dans une position dans laquelle le régulateur de débit à deux voies (38) relie le clapet d'étranglement commun (36) au réservoir (16).
  9. Chariot de manutention selon la revendication 7 ou 8, caractérisé en ce qu'un clapet d'arrêt d'abaissement est relié au régulateur de débit à deux voies pour l'actionnement par le biais d'une commande hydraulique, dans lequel le clapet d'arrêt d'abaissement (42) est conçu pour prendre une position actionnant le régulateur de débit à deux voies (38) en l'absence de tension électrique, et une position verrouillant une conduite d'abaissement (30) avec le clapet d'étranglement commun (36).
EP20120002511 2011-04-08 2012-03-21 Chariot de manutention, en particulier chariot gerbeur doté d'un cadre de levage Active EP2508465B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110016542 DE102011016542A1 (de) 2011-04-08 2011-04-08 Flurförderzeug, insbesondere Schubmaststapler mit einem Hubgerüst

Publications (2)

Publication Number Publication Date
EP2508465A1 EP2508465A1 (fr) 2012-10-10
EP2508465B1 true EP2508465B1 (fr) 2013-09-04

Family

ID=45876568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120002511 Active EP2508465B1 (fr) 2011-04-08 2012-03-21 Chariot de manutention, en particulier chariot gerbeur doté d'un cadre de levage

Country Status (3)

Country Link
EP (1) EP2508465B1 (fr)
CN (1) CN102730608B (fr)
DE (1) DE102011016542A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4385938A1 (fr) 2022-12-15 2024-06-19 CLAAS Industrietechnik GmbH Dispositif de soupape pour un chariot de manutention

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2857345B1 (fr) 2013-10-07 2017-04-26 Hyster-Yale Group, Inc. Chariot élévateur
CN106604886B (zh) 2014-09-15 2019-06-18 克朗设备公司 具有光学货物感测结构的叉车
DE102016124504A1 (de) * 2016-12-15 2018-06-21 Jungheinrich Aktiengesellschaft Hubvorrichtung für ein Flurförderzeug sowie ein solches Flurförderzeug

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1012535B (de) * 1955-03-21 1957-07-18 Und Eisengiesserei Lauingen Ko Federspeicherbremse fuer Anhaenger, insbesondere landwirtschaftliche Fahrzeuge u. dgl.
DE2930316C2 (de) 1979-07-26 1984-07-19 Jungheinrich Unternehmensverwaltung Kg, 2000 Hamburg Teleskop-Hubgerüst für Gabelstapler
DE3629089C3 (de) * 1986-08-27 1996-04-25 Jungheinrich Ag Hubstapler, insbesondere industrieller Hubstapler, mit Hubmast
GB2264282B (en) 1992-02-20 1995-04-12 Lansing Linde Ltd Lift trucks and extensible mast structures therefor
DE4317782C2 (de) * 1993-05-28 1996-01-18 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen
DE19710556C2 (de) 1997-03-14 1999-03-11 Jungheinrich Ag Ausfahrbare Mastkonstruktion für einen Hubwagen
DE19921629B4 (de) * 1999-05-10 2005-05-25 Dambach Lagersysteme Gmbh Hydraulische Hubvorrichtung
DE10125351A1 (de) 2001-05-23 2002-11-28 Still Gmbh Hydraulische Anordnung für die Hubzylinder eines Flurförderzeugs
SE529748C2 (sv) * 2004-05-03 2007-11-13 Toyota Ind Sweden Ab Anordning vid gaffeltruck
US7240771B2 (en) * 2004-05-25 2007-07-10 The Raymond Corporation Mast staging hydraulic circuit
EP2123594A1 (fr) * 2008-05-23 2009-11-25 BT Products AB Chariot élévateur industriel doté d'un contrôle de la vitesse
DE102010004650A1 (de) * 2010-01-13 2011-07-14 Jungheinrich AG, 22047 Hydraulikaggregat für Flurförderzeuge
DE102010044655A1 (de) * 2010-09-08 2012-03-08 Jungheinrich Aktiengesellschaft Flurförderzeug mit einem elektrischen Fahrantrieb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4385938A1 (fr) 2022-12-15 2024-06-19 CLAAS Industrietechnik GmbH Dispositif de soupape pour un chariot de manutention

Also Published As

Publication number Publication date
DE102011016542A1 (de) 2012-10-11
CN102730608A (zh) 2012-10-17
EP2508465A1 (fr) 2012-10-10
CN102730608B (zh) 2016-03-16

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