EP1260478A2 - Hydraulic arrangement for the lift cylinder of an industrial truck - Google Patents
Hydraulic arrangement for the lift cylinder of an industrial truck Download PDFInfo
- Publication number
- EP1260478A2 EP1260478A2 EP02010826A EP02010826A EP1260478A2 EP 1260478 A2 EP1260478 A2 EP 1260478A2 EP 02010826 A EP02010826 A EP 02010826A EP 02010826 A EP02010826 A EP 02010826A EP 1260478 A2 EP1260478 A2 EP 1260478A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- secondary cylinder
- hydraulic arrangement
- primary
- lifting
- 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.)
- Granted
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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 a hydraulic arrangement for at least two, to a common Pressure medium supply to the connected lifting cylinders of an industrial truck, one of which is provided as the first primary cylinder and one has a larger piston diameter than the second lifting cylinder, as the following extending secondary cylinder is provided.
- Generic arrangements come in multi-stage masts from forklifts for use.
- the primary cylinder with a load handler connected, for example a fork carriage, while the secondary cylinder to one height-adjustable mast of a mast coupled from a mast and one or more telescopically extendable masts.
- the exit sequence the lifting cylinder is determined by the piston surfaces of the lifting cylinder, the primary cylinder extends first due to its larger piston area. First when the primary cylinder is fully extended and hits a limit, the secondary cylinder begins to extend. In this way, a free lift achieved in which the load can be raised by the primary cylinder without the Extend the mast.
- the primary cylinder is therefore also called a "free lift cylinder" designated.
- the present invention is based on the object of an arrangement of the beginning to provide the type mentioned, even under unfavorable circumstances the extension sequence of the lifting cylinders is observed.
- This object is achieved in that the secondary cylinder pressure-dependent opening check valve is connected upstream.
- the idea essential to the invention is therefore the pressure difference between the two lifting cylinders by means of a valve.
- This is in principle any valve that achieves the desired pressure boosting function.
- Admittedly the pressure difference between the two lifting cylinders also increases that the piston diameter of the primary cylinder is increased, but this has the Disadvantage that the difference in the lifting speeds of the two lifting cylinders increases becomes what is a very unsteady movement when lifting and lowering of the load handler.
- the pressure difference is increased by achieved a check valve.
- the check valve is not activated until the end of the stroke of the primary cylinder unlocked the increasing pressure.
- a significantly higher pressure is required than for lifting the primary cylinder.
- Hydraulic oil it is also possible to determine the piston or piston rod diameter of the Reduce primary cylinder and thus reduce its dimensions. from that result in lower costs and an improved view through the mast.
- the Primary cylinder is connected downstream of the secondary cylinder and one to the secondary cylinder parallel secondary cylinder is provided, the Check valve is connected upstream of the second secondary cylinder.
- Another favorable embodiment of the invention provides that the primary cylinder is connected in parallel to the secondary cylinder.
- the check valve can be arranged in a line leading to the secondary cylinder his. According to an advantageous development of the invention, the check valve is in the Secondary cylinder integrated.
- check valve is in the bottom of the cylinder Secondary cylinder arranged bore which through the piston of the Secondary cylinder or a slide guided in the piston is closable.
- Two hydraulic cylinders 2 and 3 are provided on a hydraulic supply line 1 Lifting cylinder, which with an extendable mast of a mast in Connected, connected in parallel.
- a provided as a primary cylinder 4 Lift cylinder with one on the extendable mast of the mast vertically movable load suspension device is in connection with the one on the left in the figure Secondary cylinder 2 connected.
- the secondary cylinder 3 on the right in the figure is in a branch line 1a of the supply line 1 upstream of a check valve 5, which is initially closed (e.g. due to spring loading). Hydraulic oil under pressure therefore flows first into the Secondary cylinder 2 and the primary cylinder 4. Because the piston diameter of the primary cylinder 4 is larger than the piston diameter of the secondary cylinder 2, drives first the primary cylinder 4 from. As soon as the primary cylinder 4 is fully extended, increases the pressure of the hydraulic oil, whereby the check valve 5 opens and Hydraulic oil not only the secondary cylinder 2 but also the secondary cylinder 3 pressurized so that both secondary cylinders 2 and 3 extend.
- Figure 2 shows a variant of the invention, in which only a single secondary cylinder 3 is present.
- the primary cylinder 4 is the secondary cylinder 3 switched in parallel.
- Figure 3 shows an embodiment of the invention, in which the check valve 5 in the secondary cylinder 3 is integrated.
- a cylinder bottom 6 of the secondary cylinder 3 a recess 7 is arranged, into which the branch line 1 a opens at the lower end and which has a bore 8 to the cylinder chamber 9 at the upper end.
- the bore 8 is in the retracted state of the secondary cylinder 3 by the piston 10 (left Half of the illustration) or by a spring-loaded guided in the piston 10 Slider 11 (right half of the illustration) closed.
- a sealing action 12 is provided.
Landscapes
- 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)
Abstract
Description
Die Erfindung betrifft eine hydraulische Anordnung für mindestens zwei, an eine gemeinsame Druckmittelversorgung angeschlossene Hubzylinder eines Flurförderzeugs, von denen einer als zuerst ausfahrender Primärzylinder vorgesehen ist und einen größeren Kolbendurchmesser aufweist als der zweite Hubzylinder, der als nachfolgend ausfahrender Sekundärzylinder vorgesehen ist.The invention relates to a hydraulic arrangement for at least two, to a common Pressure medium supply to the connected lifting cylinders of an industrial truck, one of which is provided as the first primary cylinder and one has a larger piston diameter than the second lifting cylinder, as the following extending secondary cylinder is provided.
Gattungsgemäße Anordnungen kommen in mehrstufigen Hubgerüsten von Gabelstaplern zum Einsatz. Hierbei ist der Primärzylinder mit einem Lastaufnahmemittel verbunden, beispielsweise einem Gabelträger, während der Sekundärzylinder an einen höhenbeweglichen Hubmast eines Hubgerüstes gekopplet, das aus einem Standmast und einem oder mehreren teleskopartig ausfahrbaren Hubmasten besteht. Die Ausfahrfolge der Hubzylinder wird durch die Kolbenflächen der Hubzylinder bestimmt, wobei der Primärzylinder aufgrund seiner größeren Kolbenfläche zuerst ausfährt. Erst wenn der Primärzylinder vollständig ausgefahren ist und gegen eine Begrenzung anschlägt, beginnt der Sekundärzylinder auszufahren. Auf diese Weise wird ein Freihub erzielt, bei dem die Last durch den Primärzylinder angehoben werden kann, ohne das Hubgerüst auszufahren. Der Primärzylinder wird deshalb auch als "Freihubzylinder" bezeichnet.Generic arrangements come in multi-stage masts from forklifts for use. Here is the primary cylinder with a load handler connected, for example a fork carriage, while the secondary cylinder to one height-adjustable mast of a mast coupled from a mast and one or more telescopically extendable masts. The exit sequence the lifting cylinder is determined by the piston surfaces of the lifting cylinder, the primary cylinder extends first due to its larger piston area. First when the primary cylinder is fully extended and hits a limit, the secondary cylinder begins to extend. In this way, a free lift achieved in which the load can be raised by the primary cylinder without the Extend the mast. The primary cylinder is therefore also called a "free lift cylinder" designated.
Durch den Staudruck in der Verbindungsleitung zum Primärzylinder kann es insbesondere bei niedrigen Temperaturen des Hydrauliköls vorkommen, dass der Sekundärzylinder zuerst ausfährt. Dabei fährt zwangsläufig auch der damit verbundene Hubmast aus, wodurch sich die Bauhöhe des Hubgerüstes vergrößert.Due to the dynamic pressure in the connecting line to the primary cylinder, it can in particular at low temperatures the hydraulic oil occurs that the secondary cylinder leaves first. The associated lifting mast inevitably also moves off, which increases the height of the mast.
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine Anordnung der eingangs genannten Art zur Verfügung zu stellen, bei der auch unter ungünstigen Umständen die Ausfahrfolge der Hubzylinder eingehalten wird. The present invention is based on the object of an arrangement of the beginning to provide the type mentioned, even under unfavorable circumstances the extension sequence of the lifting cylinders is observed.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass dem Sekundärzylinder ein druckabhängig öffnendes Sperrventil vorgeschaltet ist.This object is achieved in that the secondary cylinder pressure-dependent opening check valve is connected upstream.
Der erfindungswesentliche Gedanke besteht demnach darin, die Druckdifferenz zwischen den beiden Hubzylindern durch ein Ventil zu erhöhen. Hierfür ist im Prinzip jedes Ventil geeignet, das die gewünschte Druckerhöhungsfunktion erzielt. Zwar ließe sich die Druckdifferenz zwischen den beiden Hubzylindem auch dadurch erhöhen, dass der Kolbendurchmesser des Primärzylinders vergrößert wird, dies hat jedoch den Nachteil, dass die Differenz der Hubgeschwindigkeiten der beiden Hubzylinder vergrößert wird, was zu einem sehr unstetigem Bewegungsablauf beim Heben und Senken des Lastaufnahmemittels führt.The idea essential to the invention is therefore the pressure difference between the two lifting cylinders by means of a valve. This is in principle any valve that achieves the desired pressure boosting function. Admittedly the pressure difference between the two lifting cylinders also increases that the piston diameter of the primary cylinder is increased, but this has the Disadvantage that the difference in the lifting speeds of the two lifting cylinders increases becomes what is a very unsteady movement when lifting and lowering of the load handler.
Bei der erfindungsgemäßen Anordnung wird die Erhöhung der Druckdifferenz durch ein Sperrventil erzielt. Erst bei Hubende des Primärzylinders wird das Sperrventil durch den sich erhöhenden Druck freigeschaltet. Zum Anheben des Sekundärzylinders wird also ein deutlich höherer Druck benötigt als zum Anheben des Primärzylinders. Damit ist stets die richtige Ausfahrfolge gegeben, auch bei niedrigen Temperaturen des Hydrauliköls. Femer ist es möglich, den Kolben- bzw. Kolbenstangendurchmesser des Primärzylinders zu verkleinern und damit dessen Abmessungen zu verringern. Daraus resultieren geringere Kosten und eine verbesserte Durchsicht durch das Hubgerüst.In the arrangement according to the invention, the pressure difference is increased by achieved a check valve. The check valve is not activated until the end of the stroke of the primary cylinder unlocked the increasing pressure. To raise the secondary cylinder This means that a significantly higher pressure is required than for lifting the primary cylinder. In order to there is always the right extension sequence, even at low temperatures Hydraulic oil. It is also possible to determine the piston or piston rod diameter of the Reduce primary cylinder and thus reduce its dimensions. from that result in lower costs and an improved view through the mast.
Gemäß einer zweckmäßigen Ausgestaltung der Erfindung ist vorgesehen, dass der Primärzylinder dem Sekundärzylinder nachgeschaltet ist und ein zu dem Sekundärzylinder parallel geschalteter zweiter Sekundärzylinder vorgesehen ist, wobei das Sperrventil dem zweiten Sekundärzylinder vorgeschaltet ist.According to an expedient embodiment of the invention, it is provided that the Primary cylinder is connected downstream of the secondary cylinder and one to the secondary cylinder parallel secondary cylinder is provided, the Check valve is connected upstream of the second secondary cylinder.
Eine andere günstige Ausgestaltung der Erfindung sieht vor, dass der Primärzylinder parallel zum Sekundärzylinder geschaltet ist.Another favorable embodiment of the invention provides that the primary cylinder is connected in parallel to the secondary cylinder.
Dass Sperrventil kann in einer zu dem Sekundärzylinder geführten Leitung angeordnet sein. Gemäß einer vorteilhaften Weiterbildung der Erfindung ist das Sperrventil in den Sekundärzylinder integriert. The check valve can be arranged in a line leading to the secondary cylinder his. According to an advantageous development of the invention, the check valve is in the Secondary cylinder integrated.
Hierbei erweist es sich als günstig, wenn das Sperrventil eine im Zylinderboden des Sekundärzylinders angeordnete Bohrung aufweist, die durch den Kolben des Sekundärzylinders oder einen im Kolben geführten Schieber verschließbar ist.It proves to be advantageous if the check valve is in the bottom of the cylinder Secondary cylinder arranged bore which through the piston of the Secondary cylinder or a slide guided in the piston is closable.
Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in den schematischen Figuren dargestellten Ausführungsbeispiels näher erläutert. Dabei zeigt
- Figur 1
- eine erfindungsgemäße hydraulische Anordnung,
Figur 2- eine Variante der erfindungsgemäßen hydraulischen Anordnung und
Figur 3- einen Schnitt durch das untere Ende eines Sekundärzylinders.
- Figure 1
- a hydraulic arrangement according to the invention,
- Figure 2
- a variant of the hydraulic arrangement according to the invention and
- Figure 3
- a section through the lower end of a secondary cylinder.
An eine hydraulische Versorgungsleitung 1 sind zwei als Sekundärzylinder 2 und 3 vorgesehene
Hubzylinder, die mit einem ausfahrbaren Hubmast eines Hubgerüstes in
Verbindung stehen, in Parallelschaltung angeschlossen. Ein als Primärzylinder 4 vorgesehener
Hubzylinder, der mit einem am ausfahrbaren Hubmast des Hubgerüsts
höhenbeweglichen Lastaufnahmemittel in Verbindung steht, ist dem in der Figur linken
Sekundärzylinder 2 nachgeschaltet.Two
Dem in der Figur rechten Sekundärzylinder 3 ist in einer Zweigleitung 1a der Versorgungsleitung
1 ein Sperrventil 5 vorgeschaltet, das zunächst geschlossen ist (z. B.
durch Federbelastung). Unter Druck stehendes Hydrauliköl fließt daher zunächst in den
Sekundärzylinder 2 und den Primärzylinder 4. Da der Kolbendurchmesser des Primärzylinders
4 größer ist als der Kolbendurchmesser des Sekundärzylinders 2, fährt zuerst
der Primärzylinder 4 aus. Sobald der Primärzylinder 4 vollständig ausgefahren ist,
erhöht sich der Druck des Hydrauliköls, wodurch das Sperrventil 5 öffnet und
Hydrauliköl nicht nur den Sekundärzylinder 2 sondern auch den Sekundärzylinder 3
beaufschlagt, so dass beide Sekundärzylinder 2 und 3 ausfahren.The
Figur 2 zeigt eine Variante der Erfindung, in der lediglich ein einzelner Sekundärzylinder
3 vorhanden ist. Hierbei ist der Primärzylinder 4 zum Sekundärzylinder 3
paralle geschaltet. Figure 2 shows a variant of the invention, in which only a single
Figur 3 zeigt eine Ausgestaltung der Erfindung, bei der das Sperrventil 5 in den Sekundärzylinder
3 integriert ist. Hierbei ist einem Zylinderboden 6 des Sekundärzylinders 3
eine Ausnehmung 7 angeordnet, in die am unteren Ende die Zweigleitung 1a mündet
und die am oberen Ende eine Bohrung 8 zum Zylinderraum 9 aufweist. Die Bohrung 8
ist im eingefahrenen Zustand des Sekundärzylinders 3 durch den Kolben 10 (linke
Hälfte der Darstellung) oder durch einen im Kolben 10 geführten, federbelasteten
Schieber 11 (rechte Hälfte der Darstellung) verschlossen. Zur Unterstützung der
Verschlusswirkung ist eine Dichtung 12 vorgesehen.Figure 3 shows an embodiment of the invention, in which the check valve 5 in the
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001125351 DE10125351A1 (en) | 2001-05-23 | 2001-05-23 | Hydraulic arrangement for the lifting cylinders of an industrial truck |
DE10125351 | 2001-05-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1260478A2 true EP1260478A2 (en) | 2002-11-27 |
EP1260478A3 EP1260478A3 (en) | 2005-04-20 |
EP1260478B1 EP1260478B1 (en) | 2008-09-17 |
Family
ID=7685999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020010826 Expired - Lifetime EP1260478B1 (en) | 2001-05-23 | 2002-05-15 | Hydraulic arrangement for the lift cylinder of an industrial truck |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1260478B1 (en) |
DE (2) | DE10125351A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1528035A2 (en) * | 2003-10-22 | 2005-05-04 | STILL WAGNER GmbH & Co KG | Lifting device for high rise shelves |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005052116B4 (en) * | 2005-11-02 | 2017-10-26 | Linde Material Handling Gmbh | Device for securing the sequence of movements of at least two fluid-operated displacement units |
DE102006003660B4 (en) * | 2006-01-26 | 2016-02-18 | Linde Material Handling Gmbh | Device for securing the sequence of movements of at least two fluid-operated displacement units |
DE102007062491A1 (en) | 2007-12-22 | 2009-06-25 | Linde Material Handling Gmbh | Lifting device for industrial truck, has lifting cylinders pressure impinged by control valve, where flow cross section of valve is downsized at low temperatures, and expandable and retractable sequences of cylinders are maintained |
DE102008013765A1 (en) | 2008-03-12 | 2009-09-17 | Linde Material Handling Gmbh | Device for securing the sequence of movements of at least two fluid-operated displacement units |
DE102009011865B4 (en) * | 2009-03-05 | 2021-11-18 | Jungheinrich Aktiengesellschaft | Lifting device for an industrial truck |
DE102011016542A1 (en) | 2011-04-08 | 2012-10-11 | Jungheinrich Aktiengesellschaft | Industrial truck, in particular reach truck with a mast |
DE102012107159A1 (en) | 2012-08-03 | 2014-02-06 | Linde Material Handling Gmbh | Hydraulic device for securing extension sequence of two common pressure medium sources attached to lifting cylinders, in mast of truck, has a control valve controlled in response to differential pressure that occurs at throttle device |
DE102013103203A1 (en) | 2013-03-28 | 2014-10-02 | Linde Material Handling Gmbh | Lifting cylinder device of a multi-stage mast of a truck |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1431497A1 (en) * | 1964-05-04 | 1968-12-19 | Hans Still Gmbh | Hydraulic lifting device, especially for industrial trucks |
DE1804054A1 (en) * | 1967-10-20 | 1969-12-18 | Cascade Corp | Sequence control for a hydraulic motor |
US3587784A (en) * | 1968-09-26 | 1971-06-28 | Hunter Manufacturing Co Inc | Telescopic load booster |
DE2507416A1 (en) * | 1975-02-21 | 1976-08-26 | Hunger Walter Kg | Parallel connected double acting telescopic cylinders - has flow divider to split flow to two cylinders with hydraulic regulating valve |
FR2321448A1 (en) * | 1975-08-20 | 1977-03-18 | Eaton Corp | HYDRAULIC SYSTEM FOR LIFT TRUCK |
US4041839A (en) * | 1975-11-24 | 1977-08-16 | Cascade Corporation | Telescopic ram |
US4593791A (en) * | 1984-04-17 | 1986-06-10 | Allis-Chalmers Corporation | Automatic sequencing circuit for lift cylinders |
-
2001
- 2001-05-23 DE DE2001125351 patent/DE10125351A1/en not_active Withdrawn
-
2002
- 2002-05-15 EP EP20020010826 patent/EP1260478B1/en not_active Expired - Lifetime
- 2002-05-15 DE DE50212778T patent/DE50212778D1/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1431497A1 (en) * | 1964-05-04 | 1968-12-19 | Hans Still Gmbh | Hydraulic lifting device, especially for industrial trucks |
DE1804054A1 (en) * | 1967-10-20 | 1969-12-18 | Cascade Corp | Sequence control for a hydraulic motor |
US3587784A (en) * | 1968-09-26 | 1971-06-28 | Hunter Manufacturing Co Inc | Telescopic load booster |
DE2507416A1 (en) * | 1975-02-21 | 1976-08-26 | Hunger Walter Kg | Parallel connected double acting telescopic cylinders - has flow divider to split flow to two cylinders with hydraulic regulating valve |
FR2321448A1 (en) * | 1975-08-20 | 1977-03-18 | Eaton Corp | HYDRAULIC SYSTEM FOR LIFT TRUCK |
US4041839A (en) * | 1975-11-24 | 1977-08-16 | Cascade Corporation | Telescopic ram |
US4593791A (en) * | 1984-04-17 | 1986-06-10 | Allis-Chalmers Corporation | Automatic sequencing circuit for lift cylinders |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1528035A2 (en) * | 2003-10-22 | 2005-05-04 | STILL WAGNER GmbH & Co KG | Lifting device for high rise shelves |
EP1528035A3 (en) * | 2003-10-22 | 2006-09-13 | STILL WAGNER GmbH & Co KG | Lifting device for high rise shelves |
Also Published As
Publication number | Publication date |
---|---|
DE10125351A1 (en) | 2002-11-28 |
EP1260478A3 (en) | 2005-04-20 |
DE50212778D1 (en) | 2008-10-30 |
EP1260478B1 (en) | 2008-09-17 |
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