EP3459904A1 - Chariot de manutention, système hydraulique pour un chariot de manutention et procédé de fonctionnement d'un système hydraulique - Google Patents

Chariot de manutention, système hydraulique pour un chariot de manutention et procédé de fonctionnement d'un système hydraulique Download PDF

Info

Publication number: EP3459904A1
Authority: EP; European Patent Office
Prior art keywords: mast; lifting; hydraulic; lowering; load
Prior art date: 2017-09-20
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

Application number

EP18194815.9A

Other languages

German (de)

English (en)

Other versions

EP3459904B1 (fr

EP3459904B2 (fr

Inventor

Michael Knieriem

Thomas Stolten

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

Original Assignee

Jungheinrich AG

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.)

2017-09-20

Filing date

2018-09-17

Publication date

2019-03-27

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2018-09-17 Application filed by Jungheinrich AG filed Critical Jungheinrich AG

2019-03-27 Publication of EP3459904A1 publication Critical patent/EP3459904A1/fr

2021-08-04 Publication of EP3459904B1 publication Critical patent/EP3459904B1/fr

2024-09-11 Application granted granted Critical

2024-09-11 Publication of EP3459904B2 publication Critical patent/EP3459904B2/fr

Status Active legal-status Critical Current

2038-09-17 Anticipated expiration legal-status Critical

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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
- B66F9/07504—Accessories, e.g. for towing, charging, locking
- 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
- 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
- F15B2211/4053—Flow control characterised by the type of flow control means or valve with flow dividers using 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Definitions

the invention relates to an industrial truck with a lifting mast with at least one mast lifting stage driven by at least one mast lifting cylinder and with a free lifting stage driven by at least one free lifting cylinder, with which a load receiving means can be moved along the lifting mast. Furthermore, the invention relates to a hydraulic system for a truck with a mast with at least one mast stroke and with a Freihubcode with which a load-bearing means along the mast is movable, wherein the hydraulic system at least one mast stroke for driving the at least one mast stroke and at least one Freihubzylinder for Driving the at least one Freihublay includes.
the invention also relates to a method for operating a hydraulic system of an industrial truck with a lifting mast with at least one mast lifting stage and with a free lifting stage, with which a load receiving means can be moved along the lifting mast, wherein the hydraulic system has at least one Mast lifting cylinder for driving the at least one mast stroke and at least one Freihubzylinder for driving the Freihublace comprises.
Forklifts such as forklifts, often have a mast with one or more mast stages, which are hydraulically operated by a mast lifting or several mast lifting cylinders.
the mast comprises a fixed mast connected to the vehicle and usually two extension masts, a center mast and an inner mast, which are extended by the mast lift.
a Freihubzylinder moves a Freihub tone, with a load receiving means, such as a fork, along the inner mast of the mast is movable.
the free lift stage moves the load handler along this mast step and allows the truck operator to move the load handler height-wise without extending the lift mast and thus changing the truck height.
Known forklifts have a common hydraulic lowering branch for the mast lift and the free lift, in which a lowering valve is integrated.
the individual mast steps and the free lift have hydraulic cylinders with different cross sections. If several mast stages have been extended, then in the load-lowering mode of the truck, that mast stage whose effective hydraulic cross-section in total is the lowest arrives first. Namely, the largest hydraulic pressure is present at this hydraulic cylinder, so that it first moves in with decreasing hydraulic pressure. Usually it is the highest mast lifting stage. With further decreasing hydraulic pressure, the mast stages become serial, ie one after the other, lowered. Finally, after the mast stages are fully retracted, the free lift stage travels and lowers the load handler.
an industrial truck with a lifting mast with at least one mast lifting stage driven by at least one mast lifting cylinder and with a free lifting stage driven by at least one free lifting cylinder, with which a load receiving means can be moved along the lifting mast, the truck being developed by a hydraulic system for supplying the at least one mast lifting cylinder and the at least one free lifting cylinder with a hydraulic fluid, the hydraulic system being set up for at least temporarily simultaneous actuation of the at least one mast lifting cylinder and the at least one free lifting cylinder in the load lifting operation and / or in the load lowering operation.
the mast steps and the load-carrying means are advantageously retracted and / or extended simultaneously. Due to the synchronous, ie at least temporarily simultaneous, actuation of the at least one mast lifting cylinder and the at least one free-lifting cylinder, the lowering time of the industrial truck can be reduced. This increases the handling capacity of the truck. This applies if the truck accesses heights that can only be reached with at least partially extended mast. In lifting operation, a jerky transition between free lift and mast lift can be avoided.
An industrial truck or material handling equipment is a means of transport for the transport of goods, which is usually used in-house and on the ground, for example, a truck.
the truck according to aspects of the invention when shutting down the load receiving means in load lowering operation from maximum height in the synchronous lowering by the time faster, as is usually required for retraction of the lifting device with the Freihubnote.
the extension process, d. H. Lifting the lifting device to its maximum height is more homogeneous and fluid than before. This improves the handling of the truck.
the truck is further developed in that the hydraulic system for relieving the at least one mast lifting cylinder and the at least one free-lifting cylinder in the load lowering operation comprises separate hydraulic return lines.
the lowering of the load handler can be accelerated by simultaneous retraction of the mast stage (s) and the free lift stage. Thanks to the separate hydraulic return lines, the mast lift cylinder and the free lift cylinder can be relieved at the same time. This also applies if the mast lifting cylinder and the free lifting cylinder or the mast lifting cylinders of the individual mast stages have different cross sections, so that they extend in load lifting mode serially, ie one after the other. would only a single hydraulic line also used to relieve the lifting cylinder, so would necessarily take place the retraction of the mast stroke and the free lift just in the reverse order as the extension. This is now advantageously no longer the case.
the truck is in particular further developed in that the hydraulic system comprises a first hydraulic return line extending between the at least one free-lifting cylinder and a reservoir for the hydraulic fluid and the hydraulic system further comprises a second hydraulic return line between the at least one mast lifting cylinder and the reservoir runs, wherein in the first return line, a first lowering valve and in the second return line, a second lowering valve is integrated.
the first lowering valve and the second lowering valve separately, d. H. independently of each other, can be controlled.
the truck is formed by a control which is adapted to simultaneously open the lowering valves in load-lowering operation when lowering the load-receiving means.
a control which is adapted to simultaneously open the lowering valves in load-lowering operation when lowering the load-receiving means.
the lowering valves are proportional valves and the controller is further adapted to to control or regulate a first volume flow through the first lowering valve and a second volume flow through the second lowering valve so that the at least one mast stroke and the load receiving means reach a lower end position at least approximately simultaneously in the load lowering operation when lowering the load receiving means.
a homogeneous and comparable behavior of the truck can be achieved when lowering the lifting means from different lifting heights. This facilitates the operability of the truck.
a uniform lowering speed of the load-receiving means can be achieved over the entire lowering process.
a displacement transducer is provided on the mast stroke and on the free stroke, so that the respective speed with which the mast stroke or the free stroke is extended or retracted can be determined. Based on this measurement, a control is possible with which a uniform and homogeneous lowering can be achieved, in particular so that the mast stroke and the load receiving means reach their lower end position at least approximately simultaneously.
the truck is further developed in particular by the fact that the hydraulic system comprises a hydraulic pump which is integrated in a hydraulic supply line and is arranged in the load lifting operation for loading the at least one mast lifting cylinder and the at least one free-lifting cylinder with pressurized hydraulic fluid, wherein the hydraulic supply line between the hydraulic pump and the lifting cylinders forks in a first and a second supply branch and the first supply branch to the free-lifting cylinder and the second supply branch extends to the mast lifting cylinder, wherein a designed as a proportional valve lift valve is integrated into the hydraulic supply line, with which a ratio between the volume flows in the first and in the second supply branch is variable.
a hydraulic pump which is integrated in a hydraulic supply line and is arranged in the load lifting operation for loading the at least one mast lifting cylinder and the at least one free-lifting cylinder with pressurized hydraulic fluid
the hydraulic supply line between the hydraulic pump and the lifting cylinders forks in a first and a second supply branch and the first supply branch to the free-lifting
the free lift cylinder has a first cross section and the lifting cylinder has a second cross section, wherein the first cross section is greater than the second cross section and the lift valve is integrated into the first supply branch.
the arrangement of the lift valve in the first supply branch is advantageous because the effective hydraulic flow cross section of the first supply branch can be reduced by means of the lift valve.
the truck is further developed by a controller which is adapted to control the lift valve such that in the load lifting operation of the free-lifting and mast lifting cylinders are at least temporarily extended simultaneously.
the controller is adapted to the lift valve such that a jerk-free transition between free lift and mast lift is achieved.
the control or control unit is in particular a part of the operation control or operation control unit of the floor vehicle.
a hydraulic system for an industrial truck with a lifting mast with at least one mast lifting stage and with a Freihubcode with which a load receiving means along the lifting mast is movable wherein the hydraulic system at least one mast lifting cylinder for driving the at least one mast stroke and at least one Freihubzylinder for driving the at least one Freihublace includes, wherein the hydraulic system is formed by the fact that this is arranged for at least temporarily simultaneous supply of at least one Masthubzylinders and the at least one Freihubzylinders with a hydraulic fluid in the load lifting and / or Lastsenkmind.
the hydraulic system makes it possible to provide an industrial truck in which the load handling device can be lowered faster than before.
the hydraulic system is particularly interesting and advantageous with regard to the possible upgrading or conversion of existing floor vehicles.
the hydraulic system is formed by having a first hydraulic return line, which extends between the at least one free-lifting cylinder and a reservoir for the hydraulic fluid and the hydraulic system further comprises a second separate hydraulic return line extending between the at least one mast lifting cylinder and the reservoir, wherein in the first return line, a first lowering valve and in the second return line is integrated with a second lowering valve.
the hydraulic system further comprises a hydraulic pump which is integrated in a hydraulic supply line and is arranged in the load lifting operation for loading the at least one mast lifting cylinder and the at least one free-lifting cylinder with pressurized hydraulic fluid, wherein the hydraulic supply line between the Hydraulic pump and the lifting cylinders aufgabelt in a first and a second supply branch and the first supply branch to the free-lifting and the second supply branch to the mast cylinder, wherein a designed as a proportional valve lift valve is integrated into the hydraulic supply line, with a ratio between the volume flows in the first and in the second supply branch is changeable.
the object is also achieved by a method for operating a hydraulic system of an industrial truck with a lifting mast with at least one mast lifting stage and with a free lifting stage with which a load receiving means is movable along the lifting mast, wherein the hydraulic system has at least one mast lifting cylinder for driving the at least one mast lifting stage and at least one Freihubzylinder for driving the Freihublace, wherein the hydraulic system is formed by that it is operated such that in the load lifting operation and / or in the load lowering operation, the at least one mast lifting and the at least a Freihubzylinder be at least temporarily operated simultaneously.
the method of operating the hydraulic system has the same or similar advantages as those already mentioned with regard to the truck or also with regard to the hydraulic system.
the method is further developed in that the hydraulic system comprises a first hydraulic return line which extends between the at least one free-lifting cylinder and a reservoir for the hydraulic fluid and the hydraulic system further comprises a separate second hydraulic return line, which between the at least one Masthubzylinder and the reservoir extends, wherein in the first return line, a first lowering valve and in the second return line, a second lowering valve is integrated, and wherein in the load lowering operation when releasing the load receiving means, the first lowering valve and the second lowering valve are opened simultaneously.
the lowering valves are proportional valves and a first volume flow through the first lowering valve and a second volume flow through the second lowering valve are controlled or regulated so that when lowering the load receiving means, the at least one mast stroke and the load receiving means at least a lower end position reach approximately simultaneously.
the hydraulic system comprises a hydraulic pump which is integrated in a hydraulic supply line and with which the at least one mast lifting cylinder and the at least one free lifting cylinder are in the load lifting operation pressurized hydraulic fluid is applied, wherein the hydraulic supply line maybegabelt between the hydraulic pump and the lifting cylinders in a first and a second supply branch and the first supply branch to the free-lifting and the second supply branch to the mast cylinder, wherein designed as a proportional valve in the hydraulic supply line is integrated, with which a ratio between a volume flow in the first and in the second supply branch is variable, wherein the free-lifting a first cross-section and the mast cylinder having a second cross section, wherein the first cross section is greater than the second cross section and the lift valve in the first supply branch is integrated and wherein the lift valve is driven in such a way that the free lift cylinder and the mast lift cylinder are at least temporarily extended simultaneously.
the lifting valve in a first position for a sequential extension of the free-lifting and mast lifting or in a second position for at least temporarily simultaneous extension is brought.
the corresponding operating mode can be selected manually, for example. However, it is also provided that a corresponding operating mode in which the mast lift and the free lift are moved simultaneously, is selected when, for example, manually a lifting height is entered, which is outside the reachable exclusively by the free lift range.
Fig. 1 shows an industrial truck 2, for example a forklift, with a lifting mast 4, comprising by way of example a first mast lifting step 41, the inner mast, and a second mast lifting step 42, the center mast.
the mast 4 is powered by a in Fig. 1 mast lifting cylinder, not shown (as well as several mast cylinders can be provided) driven.
the mast 4 comprises, in addition to the inner mast and the center mast a fixed mast connected to the vehicle frame.
the center mast is exemplarily driven by the mast lift cylinder, the inner mast is also exemplified coupled via a chain to the center mast, so that these two extension masts extend simultaneously.
the truck 2 comprises a Freihuba with a load-receiving means 6, for example a fork, which is movable along the inner mast of the lifting mast 4.
the free-lifting stage comprises a free-lifting cylinder 8.
the free-lifting cylinder 8 can move the load-receiving means 6 along the first mast stage 41 of the lifting mast 4.
Fig. 2 shows a schematic diagram of a hydraulic system 10, as it is integrated according to an embodiment in the truck 2.
the hydraulic system 10 serves to supply a mast lifting cylinder 12 and the free lifting cylinder 8, with which the load receiving means 6 is moved, with a hydraulic fluid 14.
the hydraulic fluid is taken from a reservoir 16 and returned to this again.
the hydraulic system 10 is adapted to at least temporarily operate the mast lifting cylinder 12 and the free lifting cylinder 8 in the load lifting operation and / or in the lowering operation simultaneously.
the hydraulic system 10 is adapted to the mast cylinder 12 and the free-lifting 8 both in load lifting, ie when lifting the Lifting device 6, as well as in the load lowering operation, ie when lowering the load-receiving means 6, to operate simultaneously.
the hydraulic system 10 comprises separate hydraulic return lines 18.
a first hydraulic return line 181 extends between the free-lifting cylinder 8 and the reservoir 16.
a second hydraulic return line 182 is included, which extends between the mast lift cylinder 12 and the reservoir 16.
the lowering valves 21, 22 are, for example, proportional valves. These are switchable between a first switching position 21a, 22a, in which the lowering valves 21, 22 operate as check valves, and a second switching position 21b, 22b. In the second switching position 21b, 22b, the lowering valves 21, 22 are configured to control or regulate a first volume flow or a second volume flow.
the first lowering valve 21 controls or regulates a first volume flow through the first return line 181
the second lowering valve 22 controls or regulates a second volume flow through the second return line 182.
the lowering valves 21, 22 are separately controllable.
a control 24 is included by the hydraulic system 10, which controls the two lowering valves 21, 22 via connecting lines, not shown.
the controller 24 is set up or programmed in such a way that in a load-lowering operation, ie when the load-receiving means 6 is lowered, the lowering valves 21, 22 open simultaneously.
the free-lifting cylinder 8 of the free-lifting stage and the mast lifting cylinder 12 of the lifting mast 4 are retracted at the same time. Consequently, the load lifting means 6 actuated by the free lifting stage decreases along the first mast lifting stage 41, while at the same time the lifting mast 4, ie the lifting mast 4 first and the second mast lift 41, 42, retract.
FIG. 3a to 3d show a lowering of a lifting device 6, as it takes place in a truck according to the prior art.
Fig. 3a shows the truck 2 with fully extended mast 4.
the load-carrying means 6 is located at the top stop of the first mast lift stage 41.
a conventional truck 2 includes a common return line, with both the Freihubzylinder 8 and the mast lift 12 are relieved of pressure.
Free lift cylinder 8 and mast lift cylinder 12 have different cross sections. These are chosen so that at a first pressure p1 (see. Fig. 2 ) of the hydraulic fluid 14, the Freihubzylinder 8 first moves out. If the Freihubcia reaches the top stop of the lifting mast 4, more precisely, the first mast lift stage 41 (this situation shows the Fig. 3c ), the pressure of the hydraulic fluid 14 in the hydraulic system 10 continues to increase until it reaches the value p2 which is greater than p1. When the hydraulic pressure p2 is exceeded, the mast steps 41, 42 start to extend.
the individual mast lifting cylinders 12 of the mast steps 41, 42 can in turn be designed such that their different cross sections ensure that first the first mast lifting stage 41 and then the second mast lifting stage 42 extends.
the two mast stages 41, 42 drive in about the same time.
the Freihublace drive in reverse order.
the mast 4 drives first the mast 4 (see. Fig. 3b ). Since the pressure is still above p1, the Freihublace and thus the load receiving means 6 remains at the upper stop until the mast 4 is fully retracted (see. Fig. 3c ). Only when subsequently the hydraulic pressure in the hydraulic system 10 continues to drop, namely below the value of p1, does the free-lift stage also move in and the load-receiving means 6 drops to the lower stop.
the Fig. 4a to 4c show a lowering operation of a load-receiving means 6 of an industrial truck 2 according to an embodiment.
Fig. 4a shows the truck 2 with fully extended mast 4, wherein also the load receiving means 6 is located at the upper stop of the first Mast 41.
This situation is identical to the one in Fig. 3a shown.
Fig. 4 illustrated truck 2 the Freihublace and the mast steps 41, 42 by simultaneous opening of the first and second lowering valve 21, 22 (see. Fig. 2 ) lowered synchronously.
Fig. 4b shows the truck 2 after a first time interval, after which the conventional truck 2 in Fig. 3b is shown.
the load-receiving means 6 already arrived at the lower stop of the first mast lift stage 41.
the load-receiving means 6 is lowered much faster. It saves exactly that time interval which the load-receiving means 6 in a conventional industrial truck 2 needs to be lowered along a mast lift stage 41, 42.
controller 24 is arranged such that the lowering of the lifting mast 4 and the Freihublace which moves the load receiving means 6, is controlled or regulated so that the mast steps 41, 42 and the load receiving means 6, the lower Reach at least approximately simultaneously.
a homogeneous lowering operation can be achieved, which simplifies the operation of the truck 2 for the operator.
the hydraulic system 10 of the floor vehicle 2 comprises a hydraulic pump 26 which extracts hydraulic fluid 14 from the storage container 16 via a hydraulic supply line 28.
the hydraulic pump 26 is integrated in the hydraulic supply line 28.
the hydraulic pump 26 serves to pressurize the mast lifting cylinder 12 and the free lifting cylinder 8 with pressurized hydraulic fluid 14.
the hydraulic supply line 28 bifurcates between the hydraulic pump 26 and the lifting cylinders, ie the free-lifting cylinder 8 and the mast lifting cylinder 12, into a first supply branch 31 and into a second supply branch 32.
the first supply branch 31 leads to the free-lifting cylinder 8
the second supply branch 32 leads to the mast lifting 12.
the two supply branches 31, 32nd are also considered as part of the hydraulic supply line 28.
a lifting valve 34 is integrated, which may be configured as a proportional valve.
the lift valve 34 like the hydraulic pump 26, can be controlled or regulated via the controller 24.
the free lift cylinder 8 has a first cross section and the mast lift cylinder 12 has a second cross section, wherein the first cross section is larger than the second cross section. For this reason, the free-lifting cylinder 8 is activated at a first pressure p1, the pressure p1 being smaller than the pressure p2 at which the mast-lifting cylinder 12 is activated.
the effective hydraulic flow cross-section of the lifting cylinders 8, 12 can be set variably, so that it is possible to extend both lifting cylinders 8, 12 at the same time. This takes place in the first shift position 34a of the lift valve 34.
the free lift can be blocked, so that only the mast lift cylinder 12 is actuated. It is also possible by the dynamic adjustment of the lift valve 34 to achieve a smooth transition between one of the free-lifting cylinder 8 accomplished stroke of the lifting device 6 and a stroke caused by the mast cylinder 12 same stroke.
a check valve 36 is integrated into the respective supply branch.

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

EP18194815.9A 2017-09-20 2018-09-17 Chariot de manutention, système hydraulique pour un chariot de manutention et procédé de fonctionnement d'un système hydraulique Active EP3459904B2 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE102017121818.1A DE102017121818B4 (de)	2017-09-20	2017-09-20	Flurförderzeug, hydraulisches System für ein Flurförderzeug und Verfahren zum Betreiben eines hydraulischen Systems

Publications (3)

Publication Number	Publication Date
EP3459904A1 true EP3459904A1 (fr)	2019-03-27
EP3459904B1 EP3459904B1 (fr)	2021-08-04
EP3459904B2 EP3459904B2 (fr)	2024-09-11

Family

ID=63637736

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP18194815.9A Active EP3459904B2 (fr)	2017-09-20	2018-09-17	Chariot de manutention, système hydraulique pour un chariot de manutention et procédé de fonctionnement d'un système hydraulique

Country Status (4)

Country	Link
US (2)	US11427451B2 (fr)
EP (1)	EP3459904B2 (fr)
CN (1)	CN109534238B (fr)
DE (1)	DE102017121818B4 (fr)

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DE102016124504A1 (de) *	2016-12-15	2018-06-21	Jungheinrich Aktiengesellschaft	Hubvorrichtung für ein Flurförderzeug sowie ein solches Flurförderzeug
DE102018117391A1 (de)	2018-07-18	2020-01-23	Jungheinrich Ag	Flurförderzeug mit einem hydraulischen System sowie Verfahren zum Betreiben eines hydraulischen Systems
USD940989S1 (en) *	2019-05-17	2022-01-11	Doosan Industrial Vehicle Co., Ltd.	Forklift
US20220356051A1 (en) *	2019-05-28	2022-11-10	Vehicle Service Group, Llc	Load-sensing vehicle lift
USD960484S1 (en) *	2019-11-27	2022-08-09	Hangzhou Hikrobot Technology Co., Ltd.	Forklift
KR102385239B1 (ko) *	2020-06-19	2022-04-11	두산산업차량 주식회사	지게차
JP1699646S (fr) *	2020-08-07	2021-11-15
USD981077S1 (en) *	2020-12-17	2023-03-14	Doosan Industrial Vehicle Co., Ltd.	Forklift
USD1021316S1 (en) *	2021-10-18	2024-04-02	Robopac S.P.A.	Lift truck
JP7729212B2 (ja) *	2022-01-13	2025-08-26	株式会社豊田自動織機	フォークリフトの荷役装置
USD1021317S1 (en) *	2022-05-03	2024-04-02	Robopac S.P.A.	Lift truck
DE102022120009A1 (de) *	2022-08-09	2024-02-15	Linde Material Handling Gmbh	Hydraulisches System für ein Flurförderzeug
EP4624410A1 (fr) *	2024-03-26	2025-10-01	Toyota Material Handling Manufacturing Sweden AB	Procédé pour lever/abaisser un assemble de mât d'un véhicule de manutention de matériaux et véhicule de manutention de matériaux
US12600609B2 (en)	2024-06-20	2026-04-14	Mitsubishi Logisnext Americas Inc.	Hose supports for facilitating the assembly of masts for material handling vehicles and related methods

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DE102017121818B4 (de)	2025-09-04
CN109534238A (zh)	2019-03-29
DE102017121818A1 (de)	2019-03-21
US11905153B2 (en)	2024-02-20
EP3459904B1 (fr)	2021-08-04
CN109534238B (zh)	2022-01-04
US20190084816A1 (en)	2019-03-21
EP3459904B2 (fr)	2024-09-11
US20220348447A1 (en)	2022-11-03
US11427451B2 (en)	2022-08-30

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