EP0931758B1 - Flurförderzeug mit einer Dämpfungsvorrichtung - Google Patents
Flurförderzeug mit einer Dämpfungsvorrichtung Download PDFInfo
- Publication number
- EP0931758B1 EP0931758B1 EP99100741A EP99100741A EP0931758B1 EP 0931758 B1 EP0931758 B1 EP 0931758B1 EP 99100741 A EP99100741 A EP 99100741A EP 99100741 A EP99100741 A EP 99100741A EP 0931758 B1 EP0931758 B1 EP 0931758B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- damping
- arrangement according
- transport arrangement
- load
- 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
- 238000013016 damping Methods 0.000 claims description 42
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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
-
- 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 transport arrangement with an industrial truck, in particular Pallet stacker, and a load formed by a pallet or a lattice box, the air handling vehicle being an arbitrarily controllable lifting device for lifting and Lowering the load picked up by the lifting device, wherein the load is settable on a road surface by lowering the lifting device and wherein a damping device is provided to delay the lowering movement is ,.
- the lifting device of industrial trucks of the type mentioned can be of a Operator can be controlled arbitrarily. Formed by pallets or lattice boxes Loads can be driven under with a load fork attached to the lifting device then be raised. When the load on the fork again to be parked on the road surface, the lifting device is on lowest position lowered In order to damage the load by a too fast To avoid touching down on the road surface, it is necessary to Lower the lowering speed of the lifting device in good time.
- the lowering speed of the Operator can be specified continuously or multi-stage via an operating element.
- the control element is usually a on a housing of the industrial truck arranged lever connected to a hydraulic valve provided.
- lever has ergonomic disadvantages due to its size and location on.
- this is Control element for the lifting device designed as an electrical switching element and arranged on a control drawbar of the industrial truck.
- EP 0 622 331 A1 discloses a hydraulic lifting cylinder To provide the truck with a cushioning that is just before the End position of the lifting cylinder piston is effective, but not at the time the lowering movement at which the pallet comes into contact with the road surface To ensure that the load is placed gently on the road surface, thus also a sensitive one in the arrangement described in EP 0 622 331 A1 Control of lowering speed required by the operator.
- the present invention is therefore based on the object of a generic To provide transport arrangement in which a sensitive setting of the Load on the road surface is easily possible.
- the damping device is designed so that during the lowering movement of the lifting device, before the impact of the load on the road surface.
- the Damping device Through the Damping device is the lowering speed of the lifting device before Impact of the load on the road surface automatically reduced A conscious Control of this process by the operator is therefore unnecessary. A Damage to a load due to a violent impact on the Road surface can be practically excluded.
- the damping device lasts at most for the last 25th Centimeters of the lowering movement of the lifting device before lowering the load the road surface is effective. Results will be particularly useful reached when the damping device at most on the last 15 centimeters of the Lowering movement of the lifting device before placing the load on the Road surface is effective. Along the predominant section of the Lowering movement of the lifting device takes place with maximum Speed Only the last few centimeters before touching the Road surface is the lowering movement by means of the invention Damping device braked.
- the lifting device has a hydraulic lifting cylinder and the Damping device is in operative connection with the hydraulic lifting cylinder, there is the advantage that no additional components for damping the Lowering movements are required.
- the damping device is advantageously in the hydraulic Integrated lifting cylinder. There are special advantages if the Damping device as end position damping of the hydraulic lifting cylinder is executed.
- the end position of the lifting cylinder corresponds to the lowest position the lifting device. Before reaching this lowest position, the Lowering movement braked by the end position damping of the lifting cylinder.
- piston rod, the piston and the damping piston are hollow cylindrical are formed, there is the advantage that hydraulic fluid through the lifting cylinder through to other consumers.
- damping device offers special Advantages if the industrial truck is designed as a pallet truck. At Pallet stackers on the one hand have the need to quickly lower a load enable, on the other hand, a gentle placement of the load on the To enable road surface.
- An electrical one can expediently be used to control the lifting device Switching element can be provided.
- the switching element is preferably on one Control drawbar of the truck arranged.
- a pedestrian-controlled high-lift truck is shown in FIG. 1 as an industrial truck Industrial truck is in the area of a drive part 20 with at least one Drive wheel and with usually at least one caster on one Road surface on. The drive wheel and the caster are not in the figure shown.
- the truck with two load rollers is located in the area of a load part 21 22 on the road surface, the load rollers on each wheel arm (Fig. 2, item 30) are attached directly or indirectly.
- the wheel arms are shown in FIG a load fork 23 covered, which is shown in its lowest position.
- the load fork 23 is raised and lowered on a mast 25 by means of a load carriage 24 attached movably.
- the mast 25 has two not vertically movable Outer masts 25a and two slidable along the outer masts 25a, with rollers 26 guided inner masts 25b.
- the load carriage 24 is in turn with rollers 27 in the profiles of the inner masts 25b guided vertically.
- On the load carriage 24 are two lifting chains 27 (only the right lifting chain in the drawing can be seen) attached, which is mounted on the vertically movable inner masts 25b guide rollers 28 are guided and on a cross member 29 connected to the outer masts 25a are attached.
- Two lifting cylinders (only the left lifting cylinder in the drawing is recognizable) are arranged on the sides of the mast 25, one not vertically movable cylinder housing 1 of the lifting cylinder on the outer mast 25a is attached and an extendable piston rod 10 on one with the vertically movable inner masts 25b connected cross member 31 attacks.
- the load part of the truck is shown in a front view
- Load fork 23 is shown in its lowest position above load fork 23 there is a load placed on the road surface 32, in this Embodiment a pallet 33.
- the pallet 33 can be raised. If the load fork is lowered again, the Pallet 33 on the road surface 32, a short time later the fork reaches their lowest position shown, in which the piston rod 10 completely in the Cylinder body 1 is retracted before hitting the pallet 33 on the
- a damping device becomes effective on the road surface, which brakes the lowering movement of the load fork 23.
- the damping device described below can be used with industrial trucks or used without an initial lifting device.
- an initial lifting device can the entire load part 21 relative to the drive part 20 by a few centimeters be raised, the vertical distance between the load rollers 22 to the Radarmen 30 is enlarged.
- Figure 3 shows a damping device which in the lower portion of the hydraulic lifting cylinder is integrated within the cylinder housing 1 is an axial Slidable piston 4 is arranged, which is connected to the piston rod 10. in the Contrary to the figure representation, piston 4 and piston rod 10 can also be formed in one piece. Is between the piston 4 and the cylinder housing 1 an annular gap of small width is provided.
- the piston 4 has a cylindrical Bore 8 in which a hollow cylindrical damping piston 11 is arranged.
- the hollow cylindrical damping piston 11 has in its lower, the Area facing cylinder bottom 2 at least one opening 16; only the For the sake of clarity, only one opening 16 is shown in the figure.
- the Hollow cylindrical damping piston 11 is in the cylindrical bore 8 of the piston 4th axially displaceable He is also by means of a spring 15 in the direction of Inlet and outlet opening 3 biased. Furthermore, the damping piston 15 a stop 13 through which the maximum relative displacement of the Damping piston 11 is limited relative to the piston 4.
- the spring 15 supports at its upper end facing away from the cylinder base 2 on an annular Part 9 of the piston rod 10 from.
- the piston 4 has one on its side facing the cylinder bottom 2 Pressure receiving surface 5, which is within the cylinder bore and in height the cylinder chamber 6 arranged in the inlet and outlet opening 3 determines or defines.
- Another annular cylinder chamber 7 is through the inner surface of the Cylinder housing 1 and defined by the outer surface of the piston rod 10.
- the remaining hydraulic medium in the cylinder chamber 6 can only do more through the opening 16 of the damping piston 11 into the cylindrical bore 14 and pass through this into the inlet and outlet opening 3. With a corresponding Dimensioning of the openings) 16, this transfer occurs from hydraulic medium the cylinder chamber 6 in the cylindrical space 14 such that the lowering movement in its last section is significantly delayed and a load without impact on the the road surface is set down.
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)
Description
- ein Zylindergehäuse, in dem ein mit einer Kolbenstange verbundener Kolben axial verschiebbar angeordnet ist,
- einen hohlzylindrischen Dämpfungskolben, der in seinem einem Zylinderboden zugewandten Bereich wenigstens eine Öffnung aufweist, in der zylindrischen Bohrung des Kolbens axial verschiebbar angeordnet ist, mittels einer Feder in Richtung einer in dem Zylinderboden vorgesehenen Ein- und Auslaßöffnung für ein Hydraulikmedium vorgespannt ist und wenigstens einen Anschlag aufweist, der die maximale Relativverschiebung des Dämpfungskolbens gegenüber dem Kolben begrenzt
- Figur 1
- ein zur Erfindung gehörendes Flurförderzeug,
- Figur 2
- den Lastteil des Flurförderzeugs mit einer Palette,
- Figur 3
- den unteren Abschnitt eines hydraulischen Hubzylinders.
Claims (12)
- Transportanordnung mit einem Flurförderzeug, insbesondere Hochhubwagen, und einer von einer Palette (33) oder einer Gitterbox gebildeten Last, wobei das Flurförderzeug eine willkürlich steuerbare Hubvorrichtung zum Anheben und Absenken der mit der Hubvorrichtung aufgenommenen Last aufweist, wobei die Last durch Absenken der Hubvorrichtung auf einer Fahrbahnoberfläche (32) absetzbar ist und wobei eine Dämpfungsvorrichtung zum Verzögern der Absenkbewegung vorgesehen ist, dadurch gekennzeichnet, daß die Dämpfungsvorrichtung derart ausgeführt ist, daß sie während der Absenkbewegung der Hubvorrichtung, vor dem Auftreffen der Last auf der Fahrbahnoberfläche (32), wirksam wird.
- Transportanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Dämpfungsvorrichtung höchstens auf den letzten 25 Zentimetern der Absenkbewegung der Hubvorrichtung vor dem Absetzen der Last auf der Fahrbahnoberfläche (32) wirksam ist.
- Transportanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dämpfungsvorrichtung höchstens auf den letzten 15 Zentimetern der Absenkbewegung der Hubvorrichtung vor dem Absetzen der Last auf der Fahrbahnoberfläche (32) wirksam ist.
- Transportanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hubvorrichtung mindestens einen hydraulischen Hubzylinder aufweist und die Dämpfungsvorrichtung mit dem hydraulischen Hubzylinder in Wirkverbindung steht.
- Transportanordnung nach Anspruch 4, dadurch gekennzeichnet, daß die Dämpfungsvorrichtung in dem hydraulischen Hubzylinder integriert ist
- Transportanordnung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Dämpfungsvorrichtung als Endlagendämpfung des hydraulischen Hubzylinders ausgeführt ist.
- Transportanordnung nach Anspruch 6, dadurch gekennzeichnet, daß der Hubzylinder die folgenden Merkmale aufweist:ein Zylindergehäuse (1), in dem ein mit einer Kolbenstange (10) verbundener Kolben (4) axial verschiebbar angeordnet ist,einen hohlzylindrischen Dämpfungskolben (11), der in seinem einem Zylinderboden (2) zugewandten Bereich wenigstens eine Öffnung (16) aufweist, in der zylindrischen Bohrung (8) des Kolbens (4) axial verschiebbar angeordnet ist, mittels einer Feder (15) in Richtung einer in dem Zylinderboden (2) vorgesehenen Ein- und Auslaßöffnung (3) für ein Hydraulikmedium vorgespannt ist und wenigstens einen Anschlag (13) aufweist, der die maximale Relativverschiebung des Dämpfungskolbens (11) gegenüber dem Kolben (4) begrenzt.
- Transportanordnung nach Anspruch 7, dadurch gekennzeichnet, daß, wenn sich der Kolben (4) und die Kolbenstange (10) auf eine Position in der Nähe der Ein- und Auslaßöffnung (3) zubewegen oder von dieser Position wegbewegen, der Dämpfungskolben (11) auf dem Ventilsitz (17) bereits bzw. noch aufsitzt und die Zylinderkammer (6) nur über die Öffnung (16) des Dämpfungskolbens (11) mit der Ein- und Auslaßöffnung (3) verbunden ist.
- Transportanordnung nach Anspruch 8, dadurch gekennzeichnet, daß die Kolbenstange (10), der Kolben (4) und der Dämpfungskolben (11) hohlzylindrisch ausgebildet sind.
- Transportanordnung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Flurförderzeug als Hochhubwagen ausgeführt ist
- Transportanordnung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß zur Steuerung der Hubvorrichtung ein elektrisches Schaltelement vorgesehen ist.
- Transportanordnung nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß zur Steuerung der Hubvorrichtung ein an einer Steuerdeichsel des Flurförderzeugs angeordnetes Schaltelement vorgesehen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19802119 | 1998-01-21 | ||
DE19802119A DE19802119A1 (de) | 1998-01-21 | 1998-01-21 | Flurförderzeug mit einer Hubvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0931758A1 EP0931758A1 (de) | 1999-07-28 |
EP0931758B1 true EP0931758B1 (de) | 2001-06-13 |
Family
ID=7855224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99100741A Expired - Lifetime EP0931758B1 (de) | 1998-01-21 | 1999-01-15 | Flurförderzeug mit einer Dämpfungsvorrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0931758B1 (de) |
DE (2) | DE19802119A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1988297A2 (de) | 2007-05-04 | 2008-11-05 | Jungheinrich Aktiengesellschaft | Hydraulikzylinder mit veränderlicher Endlagendämpfung |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10340957A1 (de) * | 2003-09-05 | 2005-04-07 | Jungheinrich Aktiengesellschaft | Dämpfungsanordnung für das Hubgerüst eines Flurförderzeugs |
DE102004039211A1 (de) * | 2004-08-12 | 2006-02-23 | Still Gmbh | Hubgerüst und Hydraulikzylinder mit einer Kompensationsvorrichtung |
US9403667B2 (en) * | 2011-03-18 | 2016-08-02 | The Raymond Corporation | Dynamic vibration control systems and methods for industrial lift trucks |
US8731785B2 (en) | 2011-03-18 | 2014-05-20 | The Raymond Corporation | Dynamic stability control systems and methods for industrial lift trucks |
US8763990B2 (en) | 2012-03-20 | 2014-07-01 | The Raymond Corporation | Turn stability systems and methods for lift trucks |
US9302893B2 (en) | 2013-02-07 | 2016-04-05 | The Raymond Corporation | Vibration control systems and methods for industrial lift trucks |
ES2787948B2 (es) * | 2020-03-11 | 2021-03-30 | Carreras Grupo Logistico S A | Maquina para la preparacion semi-automatica de capas completas en entornos flexibles de almacenes de gran consumo |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4706781A (en) * | 1985-02-28 | 1987-11-17 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Fluid-operated cylinder with cushioning flow rate control valve means |
IT1272114B (it) * | 1993-03-19 | 1997-06-11 | Fiat Om Carrelli Elevatori Spa | Unita' di sollevamento delle forche in carrelli elevatori |
DE29707639U1 (de) * | 1997-04-28 | 1997-08-21 | Still GmbH, 22113 Hamburg | Hydraulischer Zylinder mit Stoßsicherung |
-
1998
- 1998-01-21 DE DE19802119A patent/DE19802119A1/de not_active Withdrawn
-
1999
- 1999-01-15 EP EP99100741A patent/EP0931758B1/de not_active Expired - Lifetime
- 1999-01-15 DE DE59900113T patent/DE59900113D1/de not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1988297A2 (de) | 2007-05-04 | 2008-11-05 | Jungheinrich Aktiengesellschaft | Hydraulikzylinder mit veränderlicher Endlagendämpfung |
DE102007021052A1 (de) | 2007-05-04 | 2008-11-06 | Jungheinrich Ag | Hydraulikzylinder mit veränderlicher Endlagendämpfung |
Also Published As
Publication number | Publication date |
---|---|
DE59900113D1 (de) | 2001-07-19 |
DE19802119A1 (de) | 1999-07-22 |
EP0931758A1 (de) | 1999-07-28 |
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