EP0908413B1 - Fluförderzeug mit einer Lastaufnahmevorrichtung - Google Patents
Fluförderzeug mit einer Lastaufnahmevorrichtung Download PDFInfo
- 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
Links
Images
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.
Description
- Figur 1
- eine hydraulische Schaltung für eine Hubvorrichtung.
- Figur 2a, b
- Diagramme für die Steuersignale der Hydraulikpumpe und verschiedener Ventile.
Claims (7)
- Flurförderzeug mit einer vertikal beweglichen Lastaufnahmevorrichtung, wobei eine Vorrichtung zum vertikalen Bewegen der Lastaufnahmevorrichtung mindestens einen Hydraulikzylinder (5) und mindestens eine mittels eines Elektromotors (1 a) antreibbare Hydraulikpumpe (2a) aufweist und die angetriebene Hydraulikpumpe (2a) eine Druckseite und eine Saugseite aufweist, wobei die Hydraulikpumpe (2a) zum Anheben der Lastaufnahmevorrichtung eine vorgegebene Hauptförderrichtung aufweist und wobei eine die Hydraulikpumpe (2a) mit dem Hydraulikzylinder (5) verbindende Leitung (6) mittels einer Ablaßleitung mit einem Tank verbindbar ist und in der Ablaßleitung ein stufenlos einstellbares Ablaßventil (8) angeordnet ist, dadurch gekennzeichnet, daß die Hydraulikpumpe (2a) während des Absenkens der Lastaufnahmeeinrichtung eine zur Hauptförderrichtung gleichgerichtete Förderrichtung aufweist, wobei die Saugseite der von dem Elektromotor angetriebenen Hydraulikpumpe (2a) mit dem Hydraulikzylinder (5) verbindbar ist.
- Flurförderzeug nach Anspruch 1, dadurch gekennzeichnet, daß der Hydraulikzylinder (5) mit der Saugseite der Hydraulikpumpe (2a) mittels einer Bypassleitung (12) verbindbar ist.
- Flurförderzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Ablaßventil (8) als Sitzventil ausgebildet ist.
- Flurförderzeug nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Ablaßventil (8) und/oder der Elektromotor (1a) mittels einer elektrischen Impulssteuereinheit steuerbar sind.
- Flurförderzeug nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Elektromotor (1a) als fremderregter Gleichstrom-Nebenschlußmotor ausgeführt ist.
- Flurförderzeug nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß zur Steuerung des Anhebens und/oder des Absenkens der Lastaufnahmevorrichtung mindestens ein stufenlos betätigbares elektrisches Schaltelement vorgesehen ist, das mit der elektrischen Impulssteuereinheit in Wirkverbindung steht.
- Flurförderzeug nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Flurförderzeug als Hochhubwagen, vorzugsweise als deichselgeführter Hochhubwagen ausgeführt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19744429 | 1997-10-08 | ||
DE19744429A DE19744429A1 (de) | 1997-10-08 | 1997-10-08 | Flurförderfahrzeug mit einer Lastaufnahmevorrichtung und Verfahren zum Absenken der Lastaufnahmevorrichtung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0908413A2 EP0908413A2 (de) | 1999-04-14 |
EP0908413A3 EP0908413A3 (de) | 2001-08-08 |
EP0908413B1 true EP0908413B1 (de) | 2005-12-21 |
Family
ID=7844933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98118873A Expired - Lifetime EP0908413B1 (de) | 1997-10-08 | 1998-10-06 | Fluförderzeug mit einer Lastaufnahmevorrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0908413B1 (de) |
DE (2) | DE19744429A1 (de) |
Cited By (1)
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)
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 |
ATE260726T1 (de) * | 2000-04-20 | 2004-03-15 | Procontrol Ag | Verfahren sowie antriebssystem für die steuerung/regelung der linearen press- /giessbewegung |
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 |
AU2018200354B2 (en) | 2017-01-17 | 2023-02-23 | The Raymond Corporation | Variable hydraulic pressure relief systems and methods for a material handling vehicle |
EP3997346A1 (de) * | 2019-07-08 | 2022-05-18 | Danfoss Power Solutions II Technology A/S | In systemarchitekturen verwendbare hydraulische systemarchitekturen und bidirektionale proportionalventile |
Family Cites Families (7)
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 |
-
1997
- 1997-10-08 DE DE19744429A patent/DE19744429A1/de not_active Ceased
-
1998
- 1998-10-06 EP EP98118873A patent/EP0908413B1/de not_active Expired - Lifetime
- 1998-10-06 DE DE59813292T patent/DE59813292D1/de not_active Expired - Lifetime
Cited By (1)
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 |
---|---|
EP0908413A2 (de) | 1999-04-14 |
DE59813292D1 (de) | 2006-01-26 |
EP0908413A3 (de) | 2001-08-08 |
DE19744429A1 (de) | 1999-04-22 |
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