EP0908413B1 - Chariot élévateur avec un dispositif de prise de la charge - Google Patents

Chariot élévateur avec un dispositif de prise de la charge Download PDF

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Publication number
EP0908413B1
EP0908413B1 EP98118873A EP98118873A EP0908413B1 EP 0908413 B1 EP0908413 B1 EP 0908413B1 EP 98118873 A EP98118873 A EP 98118873A EP 98118873 A EP98118873 A EP 98118873A EP 0908413 B1 EP0908413 B1 EP 0908413B1
Authority
EP
European Patent Office
Prior art keywords
load
hydraulic pump
industrial truck
electric motor
hydraulic 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.)
Expired - Lifetime
Application number
EP98118873A
Other languages
German (de)
English (en)
Other versions
EP0908413A3 (fr
EP0908413A2 (fr
Inventor
Hartmut Nedele
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 Wagner GmbH and Co KG
Original Assignee
Still Wagner GmbH and Co KG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7844933&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0908413(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Still Wagner GmbH and Co KG filed Critical Still Wagner GmbH and Co KG
Publication of EP0908413A2 publication Critical patent/EP0908413A2/fr
Publication of EP0908413A3 publication Critical patent/EP0908413A3/fr
Application granted granted Critical
Publication of EP0908413B1 publication Critical patent/EP0908413B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means

Definitions

  • the invention relates to an industrial truck with a vertically movable Load-receiving device, wherein a device for vertically moving the Load-receiving device at least one hydraulic cylinder and at least one Having by means of an electric motor drivable hydraulic pump and the driven hydraulic pump has a pressure side and a suction side, wherein the Hydraulic pump for lifting the load receiving device a predetermined Has main conveying direction and wherein a hydraulic pump with the Hydraulic cylinder connecting line by means of a drain line with a tank is connectable and in the discharge line a continuously adjustable drain valve is arranged.
  • Forklifts of the type mentioned usually have a mast on which the Load-receiving device is mounted movable up and down.
  • Lifting the Load bearing device by means of a hydraulic cylinder, which with a Hydraulic pump is connected.
  • the hydraulic cylinder via a valve connected to a tank.
  • the hydraulic oil in the hydraulic cylinder then flows due to the weight of the load bearing device and the weight a load possibly present on the load handling device into the tank from. It is also known that during the lowering of the hydraulic cylinder passing hydraulic oil through the hydraulic pump in this Operating situation is then operated as a hydraulic motor and the electric motor, which then works as a generator drives.
  • DC shunt motors are used in industrial trucks, especially at tiller-guided industrial trucks such as Low or high stacker, for the Drive the lifting device or generally known for the drive.
  • the present invention has for its object to provide a truck for To provide, in which with a conventional hydraulic pump a fast Lowering the load bearing device is possible without load.
  • a the hydraulic pump with the Hydraulic cylinder connecting line is by means of a drain line with a tank connectable. A part of the hydraulic oil flowing through the pump and / or a part of the hydraulic cylinder effluent oil flow can through the discharge line in drain the tank.
  • the drain line is a continuously adjustable starting valve arranged The lowering speed and the lifting speed of Load-receiving device may depend on the switching position of the drain valve be adjusted continuously.
  • the hydraulic cylinder with the suction side of the Hydraulic pump is connected by means of a bypass line.
  • the bypass line is closed by a check valve, which is used to lower the Load picking device is opened.
  • the drain valve and / or the electric motor are by means of an electric Pulse control unit controllable.
  • At least one continuously operated electric Switching element provided with the electrical pulse control unit in Active compound is.
  • the truck as a stacker is preferably designed as a pedestrian-controlled stacker.
  • a Tiller - guided stackers require the movement of the Lifting device to control with an electric switch, as larger Switching elements can not be arranged on the drawbar.
  • the load-carrying device of pallet trucks of this type usually has a relative low weight, so that the acceleration of the lowering movement a particularly great importance. With the invention, it is now possible, a fast Lowering the load-bearing device to control from the drawbar.
  • FIG 1 shows an embodiment of the lifting device of an inventive Flurmillionmes.
  • the pump 2a Hydraulic oil from the tank 4 through two check valves 10, 11 in the Hydraulic cylinder 5 pumped.
  • An arranged in a bypass line 12 switchable Shut-off valve 13 is located in the drawn shut-off position. about the adjustable drain valve 8, the Hub Marie be adjusted.
  • the check valve 13 is opened.
  • the from the hydraulic cylinder 5 effluent hydraulic oil can then on the Bypass line through the hydraulic pump 2a and the drain valve 8 in the tank. 5 flow away.
  • the drain valve 8 With the drain valve 8, the lowering speed of the Load picking device adjusted. This can, in particular if on the Load bearing device is a large load, with the hydraulic pump 2a and the electric motor 1a energy to be recovered.
  • the hydraulic pump 2a through the Electric motor to be driven 1a which in this embodiment, the Suction side of the hydraulic pump 2a is located in the drawing below. Is appropriate an embodiment of the electric motor 1a as a DC shunt motor or as Three-phase asynchronous motor.
  • Figure 2a shows the sizes of the control signal 17 for the check valve 13, the Control signal 18 for the discharge valve 8 and the control signal 19 for the Electric motor 1 a above the set by the operator 20 setpoint for the Lowering speed. From this diagram it can be seen that the check valve 13th is always open when lowering the load handling device. The drain valve 8 becomes continuous as the lowering speed command value 20 increases open. If the setpoint for the lowering speed is its maximum value has approximately reached, with the control signal 19 in addition the electric motor 1a switched on to assist the lowering movement of the load receiving device.
  • Figure 2b shows the corresponding sizes of the control signal 17a for the check valve 13, the control signal 18a for the discharge valve 8 and the control signal 19a for the Electric motor 1 a above the set by the operator 20a setpoint for the Lifting speed.
  • the check valve 13 is always in during lifting the position shown in Figure 1.
  • the electric motor 1a during the Lifting always in operation.
  • All control signals according to FIGS. 2 a and 2 b are preferably provided with one or more generates several pulse control units and are thus of pulse-shaped Voltages shown.

Landscapes

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

Claims (7)

  1. Chariot de manutention comprenant un dispositif de prise de la charge déplaçable verticalement, un dispositif de déplacement vertical du dispositif de prise de la charge comprenant au moins un vérin hydraulique (5) et au moins une pompe hydraulique (2a) pouvant être entraínée au moyen d'un moteur électrique (1a) et la pompe hydraulique (2a) entraínée présentant un côté refoulement et un côté aspiration, la pompe hydraulique (2a) présentant un sens de circulation principal prédéfini pour lever le dispositif de prise de la charge et une conduite (6) reliant la pompe hydraulique (2a) avec le vérin hydraulique (5) pouvant être reliée avec un réservoir au moyen d'une conduite d'évacuation et une vanne d'évacuation (8) à réglage graduel étant montée dans la conduite d'évacuation, caractérisé en ce que la pompe hydraulique (2a) présente pendant la descente du dispositif de prise de la charge un sens de circulation dirigé dans le même sens que le sens de circulation principal, le côté aspiration de la pompe hydraulique (2a) entraínée par le moteur électrique pouvant être relié avec le vérin hydraulique (5).
  2. Chariot de manutention selon la revendication 1, caractérisé en ce que le vérin hydraulique (5) peut être relié avec le côté aspiration de la pompe hydraulique (2a) au moyen d'une conduite de dérivation (12).
  3. Chariot de manutention selon la revendication 1 ou 2, caractérisé en ce que la vanne d'évacuation (8) est réalisée sous la forme d'une soupape à siège.
  4. Chariot de manutention selon l'une des revendications 1 à 3, caractérisé en ce que la vanne d'évacuation (8) et/ou le moteur électrique (1a) peuvent être commandées au moyen d'une unité de commande électrique à impulsions.
  5. Chariot de manutention selon l'une des revendications 1 à 4, caractérisé en ce que le moteur électrique (1a) est réalisé sous la forme d'un moteur électrique shunt à courant continu d'excitation externe.
  6. Chariot de manutention selon la revendication 4 ou 5, caractérisé en ce qu'au moins un élément de commutation à commande électrique graduelle, lequel se trouve en liaison active avec l'unité de commande électrique à impulsions, est prévu pour commander le levage et/ou la descente du dispositif de prise de la charge.
  7. Chariot de manutention selon l'une des revendications 1 à 6, caractérisé en ce que le chariot de manutention est réalisé sous la forme d'un chariot élévateur à levage haut, de préférence sous la forme d'un chariot élévateur à levage haut avec guidage par timon.
EP98118873A 1997-10-08 1998-10-06 Chariot élévateur avec un dispositif de prise de la charge Expired - Lifetime EP0908413B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19744429A DE19744429A1 (de) 1997-10-08 1997-10-08 Flurförderfahrzeug mit einer Lastaufnahmevorrichtung und Verfahren zum Absenken der Lastaufnahmevorrichtung
DE19744429 1997-10-08

Publications (3)

Publication Number Publication Date
EP0908413A2 EP0908413A2 (fr) 1999-04-14
EP0908413A3 EP0908413A3 (fr) 2001-08-08
EP0908413B1 true EP0908413B1 (fr) 2005-12-21

Family

ID=7844933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118873A Expired - Lifetime EP0908413B1 (fr) 1997-10-08 1998-10-06 Chariot élévateur avec un dispositif de prise de la charge

Country Status (2)

Country Link
EP (1) EP0908413B1 (fr)
DE (2) DE19744429A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102695884A (zh) * 2009-11-17 2012-09-26 罗伯特·博世有限公司 具有能量回收的液压驱动系统

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19921629B4 (de) * 1999-05-10 2005-05-25 Dambach Lagersysteme Gmbh Hydraulische Hubvorrichtung
DE29911686U1 (de) 1999-07-06 1999-09-16 Heilmeier & Weinlein Elektrohydraulischer Hubmodul
CZ20023744A3 (cs) * 2000-04-20 2003-06-18 Procontrol Ag Způsob, jakož i hnací systém pro řízení / regulaci lineárního lisovacího / licího pohybu
DE10033094B4 (de) * 2000-07-07 2005-12-08 Buchholz Hydraulik Gmbh Steuereinrichtung
DE10048215A1 (de) * 2000-09-28 2002-04-11 Still Wagner Gmbh & Co Kg Hydraulische Hubvorrichtung
DE10154449A1 (de) * 2001-11-06 2003-05-15 Dambach Lagersysteme Gmbh & Co Hydraulische Hubvorrichtung insbesondere für batteriegetriebene Flurförderzeuge und Verfahren zu deren Steuerung
DE20212459U1 (de) * 2002-08-13 2003-12-24 Hawe Hydraulik Gmbh & Co. Kg Elektrohydraulischer Bremsmodul
JP4796350B2 (ja) * 2005-07-29 2011-10-19 カヤバ工業株式会社 回生機能付き流体圧制御回路
NL1031744C2 (nl) * 2006-05-03 2007-11-06 Stertil Bv Hefsysteem.
FI123664B (fi) * 2008-02-29 2013-09-13 Metso Paper Inc Paperi- tai kartonkikoneessa käytetyn laitteiston kuormitussylinterin hydraulijärjestelmä sekä menetelmä kuormitussylinterin paineistamiseksi hydraulijärjestelmässä
US8966891B2 (en) * 2011-09-30 2015-03-03 Caterpillar Inc. Meterless hydraulic system having pump protection
DE102012024647A1 (de) * 2012-12-17 2014-06-18 Jungheinrich Aktiengesellschaft Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug
US9360023B2 (en) * 2013-03-14 2016-06-07 The Raymond Corporation Hydraulic regeneration system and method for a material handling vehicle
US10844880B2 (en) 2017-01-17 2020-11-24 The Raymond Corporation Variable hydraulic pressure relief systems and methods for a material handling vehicle
WO2021004657A1 (fr) * 2019-07-08 2021-01-14 Eaton Intelligent Power Limited Architectures de système hydraulique et vannes proportionnelles bidirectionnelles utilisables dans les architectures de système

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE3507231A1 (de) * 1985-03-01 1986-09-04 Messerschmitt-Bölkow-Blohm GmbH, 2800 Bremen Anordnung zum gleichmaessigen hydraulischen anheben und absenken von plattformen
DE3602510A1 (de) * 1986-01-28 1987-07-30 Steinbock Gmbh Hydraulisches hubwerk
DE4140408A1 (de) * 1991-12-07 1993-06-09 Robert Bosch Gmbh, 7000 Stuttgart, De Elektrohydraulische steuereinrichtung
DE4219787C1 (de) * 1992-06-17 1994-01-05 Jungheinrich Ag Fahrzeug mit batterie-elektrischem Fahr-Antrieb, insbesondere Hublader
DE4402653C2 (de) * 1994-01-29 1997-01-30 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
JPH0826697A (ja) * 1994-07-19 1996-01-30 Meikikou:Kk 油圧式テーブルリフト装置と該装置におけるテーブル昇降速度の制御方法
IT1280604B1 (it) * 1995-11-02 1998-01-23 Sme Elettronica Spa Gruppo di potenza per l'alimentazione di attuatori idraulici

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102695884A (zh) * 2009-11-17 2012-09-26 罗伯特·博世有限公司 具有能量回收的液压驱动系统

Also Published As

Publication number Publication date
DE59813292D1 (de) 2006-01-26
EP0908413A3 (fr) 2001-08-08
DE19744429A1 (de) 1999-04-22
EP0908413A2 (fr) 1999-04-14

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