EP1052215A2 - Dispositif de levage hydraulique - Google Patents

Dispositif de levage hydraulique Download PDF

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Publication number
EP1052215A2
EP1052215A2 EP00108142A EP00108142A EP1052215A2 EP 1052215 A2 EP1052215 A2 EP 1052215A2 EP 00108142 A EP00108142 A EP 00108142A EP 00108142 A EP00108142 A EP 00108142A EP 1052215 A2 EP1052215 A2 EP 1052215A2
Authority
EP
European Patent Office
Prior art keywords
lifting
speed
hydraulic
hydraulic oil
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.)
Granted
Application number
EP00108142A
Other languages
German (de)
English (en)
Other versions
EP1052215B1 (fr
EP1052215A3 (fr
Inventor
Octavian Mare
Hans-Peter Schrad
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.)
Dambach Lagersysteme GmbH
Original Assignee
Dambach Lagersysteme GmbH
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Filing date
Publication date
Application filed by Dambach Lagersysteme GmbH filed Critical Dambach Lagersysteme GmbH
Publication of EP1052215A2 publication Critical patent/EP1052215A2/fr
Publication of EP1052215A3 publication Critical patent/EP1052215A3/fr
Application granted granted Critical
Publication of EP1052215B1 publication Critical patent/EP1052215B1/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

Definitions

  • the invention relates to a hydraulic lifting device especially for battery powered industrial trucks, with a pump that can be driven by an electric motor, by means of at least one hydraulic one in load lifting operation Lift cylinder hydraulic oil from a reservoir Can be supplied via a supply line, the hydraulic oil in load-lowering operation from the lifting cylinder via a Return line flowing through the as a generator working electric motor driving hydraulic motor in the reservoir is returnable, and with a Control device for changing the lifting or lowering speed of the lifting cylinder.
  • a hydraulic lifting device with a corresponding energy recovery is for example shown in DE 43 17 782 C2, an electric motor has, which drives a pump, which is in load lifting operation Hydraulic oil from a reservoir to the hydraulic one Promotes lifting cylinder, the adjustment or Lifting speed of the hydraulic lifting cylinder above control of the speed of the electric motor is achieved becomes.
  • the hydraulic oil from the hydraulic lifting cylinder guided by a hydraulic motor which is also in this state as Hydromotor acting pump can act.
  • the hydraulic motor drives a generator or as in this state Generator working electric motor, from which means a suitable, known electrical circuit the associated battery for energy recovery is charged. It occurs both in the load lifting as well in load lowering the problem is that with only a small Changes in position of the lifting cylinder or its deliberately slow adjustment (creep speed) of the electric motor and thus the pump with a very small one Speed are operated, which on the one hand is an unfavorable Efficiency and high wear the pump is connected so that its life is reduced is.
  • the invention has for its object a hydraulic To create lifting device of the type mentioned even with only slight and / or slow changes in position of the hydraulic lifting cylinder is excessive Wear of the pump is reliably avoided.
  • control device is a sensor device for Detection of the lifting or lowering speed of the lifting cylinder has, the speed of the lifting cylinder is controllable by means of the speed of the motor when the detected stroke speed a first limit or the detected lowering speed a second limit exceeds, and being the speed of the lifting cylinder if the limit values are undershot using the Hydraulic oil volume flow in the supply or return line is adjustable.
  • the speed of the electric motor for controlling the lifting or lowering speed of the hydraulic lifting cylinder is only used if the lifting cylinder is adjusted sufficiently quickly or the lifting speed detected by the sensor device has a predetermined first limit value v HG or the lowering speed a predetermined second limit value v exceed SH .
  • the two limit values can be the same or different and are preferably of the order of 0.1 m / sec.
  • the limit values should be chosen so that the pump at these limits has a minimum speed on the order of 500 for the speed of the lifting cylinder min -1. At this or a higher speed, on the one hand, a sufficiently high degree of efficiency is ensured and, in particular, excessive wear of the pump is avoided.
  • the speed of the lifting cylinder will not exceed the speed of the electric motor and thus Pump, but changed over the volume or mass flow of the hydraulic oil flowing in the feed or return line.
  • the supply line has a branch line, via which hydraulic oil can be branched off from the supply line in load lifting operation, and that a flow control valve is arranged in the branch line, by means of which the hydraulic oil volume flow supplied to the hydraulic cylinder can be changed.
  • a flow control valve is arranged in the branch line, by means of which the hydraulic oil volume flow supplied to the hydraulic cylinder can be changed.
  • the flow control valve is now gradually closed, the volume flow of the hydraulic oil supplied to the hydraulic cylinder in the supply line increases, as a result of which the lifting cylinder is adjusted at an increasing speed. If the adjustment of the lifting cylinder is slower again, the flow control valve is opened accordingly and thus more hydraulic oil is discharged from the supply line via the branch line, so that the hydraulic oil volume flow supplied to the lifting cylinder decreases. In this way it is ensured that even with very small and / or very slow lifting movements of the lifting cylinder at speeds below the predetermined limit values, the electric motor or the pump are operated with a sufficient minimum speed. If after a complete closing of the flow control valve and thus the branch line a further increase in the lifting speed of the lifting cylinder is desired, this is achieved by increasing the speed of the pump.
  • the detection of the lifting or lowering speed of the Lift cylinder takes place directly by means of the sensor device on the lifting cylinder, either using a Displacement sensor system the current actual position of the load or of the lifting cylinder and taken into account the speed over time or also the speed tapped directly can be.
  • a flow control valve is arranged in the return line, by means of which the volume flow of the hydraulic oil returned from the hydraulic cylinder to the storage container can be changed.
  • the speed change is achieved solely by changing the flow cross section of the flow control valve and thus the volume or mass flow of the hydraulic oil derived from the lifting cylinder.
  • the hydraulic oil flowing in the return line also flows through a hydraulic motor or the pump which acts as a hydraulic motor in this state, the electric motor rotating in idle.
  • the change in the lowering speed can be achieved by regulating the electric motor to a certain speed, whereby a counter torque is generated, with such a lowering speed ensuring that the speed of the pump and thus of the electric motor is above the device-specific minimum speed, for example, 500 min -1.
  • the potential energy of the overall system caused by the raised load is converted into electrical energy by the electric motor acting as a generator and supplied to the battery.
  • the line arrangement is preferably provided such that the pump both in load lifting operation and in load lowering operation in the same direction from the hydraulic oil is flowed through and thus always in the same direction of rotation rotates, it is preferably provided that also the electric motor in both operating states in the turns in the same direction. In this way, the keep design effort low. Beyond that due to the same direction of rotation of the motor both in Load lifting operation as well as the load lowering the reaction times essential when changing the direction of movement shortened, which enables more precise positioning.
  • a check valve may be arranged, which in the locked position is biased. In the event of a power failure close the shut-off valve and the flow control valve automatically and thus prevent the hydraulic oil from flows back into the reservoir in the hydraulic cylinder. It is particularly provided that the check valve is located near the flow control valve. Here if the engine control fails during the lowering process Holding function by the shut-off valve and the flow control valve ensured in a two-channel manner.
  • a hydraulic lifting device shown in the figure 10 comprises a reservoir 11 for hydraulic oil, of one of several sections L1.1, L1.2 and L1.3 existing supply line L1 with two hydraulic lifting cylinders 13 is connected.
  • the used below Information “upstream” and “downstream” refer to a Oil flow from the reservoir 11 to the lifting cylinders 13, i.e. in the feed direction for load lifting operation.
  • a first check valve 12 is arranged, the one Oil flow in the feed direction, i.e. to the lifting cylinders 13 allows and prevents backflow.
  • a hydraulic pump P Downstream of the first check valve 12 is a hydraulic pump P arranged by means of an electric motor M is driven, the energy via a power connection 21 from a battery, not shown. Of the Pump P leads a leakage line L3 back into the reservoir 11.
  • a second section closes downstream of the pump P.
  • L1.2 of the feed line L1 which leads to a check valve 15 leads between an open position in which one Flow in both directions is possible, and one Locking position is adjustable, in which only one oil flow in the feed direction, i.e. to the lifting cylinders 13, possible and backflow is prevented.
  • the lock valve 15 is in a mechanical manner, for example by means of a Spring biased into a locked position, which is at one takes any power failure automatically.
  • a second check valve 14 arranged, which also only an oil flow in the feed direction, i.e. to the lifting cylinders 13 allows and prevents backflow.
  • a third section closes the check valve 15 L1.3 of the supply line L1, which is located at its downstream located end in two connecting lines L4.1 and L4.2 branches, each to one of the hydraulic Guide lift cylinder 13.
  • a drain line L5 which is a normally closed Has valve 17 and in the reservoir 11th leads back.
  • One branches from the bridging line L6 bypass line also opening into the drain line L5 L7 from, in which a further check valve 18 is arranged.
  • This further check valve 18 is also between one Open position in which there is a flow in both directions is possible, and a locking position adjustable, in the only one flow from drain line L5 to the second Section L1.2 of the supply line L1 possible and a Flow in the opposite direction is prevented.
  • the two lifting cylinders 13 are each only schematic shown sensor device 20 associated with the current position of the lifting cylinder 13 or the load detected and a corresponding control signal to a processing unit in which the lifting or lowering speed the lifting cylinder is calculated.
  • Lifting device 10 explains:
  • hydraulic oil In load lifting operation, ie for lifting the lifting cylinders 13, hydraulic oil must be conveyed from the reservoir 11 through the supply line L1 into the corresponding chamber of the lifting cylinders 13.
  • the current control valve 16 in the branch line 8 is opened completely and at the same time the electric motor M is brought to a minimum speed of 500 min ⁇ 1 with the pump P.
  • the hydraulic oil drawn in by the pump P from the reservoir 11 via the first section L1.1 of the supply line L1 and delivered via the continuing second section L1.2 is completely or at least almost completely via the branch line L8 in this state due to the fully open flow control valve 16 returned to a region of the feed line L1 located upstream of the pump P.
  • the flow control valve 16 is then gradually closed, as a result of which an increasing proportion of the volume flow of hydraulic oil conveyed by the pump P passes through the third section L1.3 of the supply line and the supply lines L4.1 and L4.2 to the lifting cylinders 13, as a result of which they initially slow and then be raised with increasing speed.
  • An increase in the lifting speed is achieved by reducing the flow cross-section of the flow control valve 16 and the associated increase in the volume flow of hydraulic oil to the lifting cylinders 13. Accordingly, the lifting speed can be reduced by increasing the flow cross section of the flow control valve and thus reducing the volume flow of hydraulic oil to the lifting cylinders.
  • the maximum lifting speed to be set in this way is achieved when the flow control valve 16 is completely closed. If a further increase in the lifting speed of the lifting cylinder 13 is desired, this can be achieved by increasing the speed of the electric motor M and thus of the pump P.
  • the change in the lifting speed of the lifting cylinders 13, which takes place either by controlling the flow control valve 16 for the purpose of changing the flow cross section or by controlling the electric motor for the purpose of changing the speed, is carried out as a function of the current lifting speed, which is determined by the sensor devices 20. If the current lifting speed is below a predetermined limit value v HG , the lifting speed is changed solely by actuating the flow control valve. If the current stroke speed is above the limit v HG, changing the lifting speed is carried out solely by driving the electric motor M, it being ensured in this state that the rotational speed of the electric motor M is above a minimum speed, for example, 500 min. 1
  • the hydraulic oil must be returned from the lifting cylinders into the storage container 11.
  • the check valve 15 and the flow control valve 16 are opened.
  • the hydraulic oil can then flow from the lifting cylinders 13 via the supply lines L4.1 and L4.2, the third section L1.3 of the supply line L1 and through the check valve 15 into the branch line L2, whereby it flows through the flow control valve 16 and into the first Section L1.1 of the feed line L1 flows in.
  • the hydraulic oil is prevented from flowing directly back into the reservoir 11 by the first check valve 12.
  • the hydraulic oil then flows through the pump P, which can work as a hydraulic motor in this state, and enters the bypass line L6 and from there via the bypass line L7 and the opened further shut-off valve 18 into the drain line L5 leading to the reservoir 11.
  • the backflow of the hydraulic oils is achieved solely by actuating the flow control valve 16 in the branch line L8.
  • the electric motor which is driven by the pump P, which acts as a hydraulic motor and flows through the hydraulic oil in the same direction as in the load-lifting mode, operates in idle mode, so that the hydraulic oil is introduced into the reservoir 11 without pressure.
  • a change in the lowering speed can be achieved by changing the flow cross-section of the flow control valve 16.
  • the pump P and the motor M Upon complete opening of the flow regulating valve 16, the pump P and the motor M to rotate at a speed corresponding to the minimum speed, for example 500 min. 1
  • the associated lowering speed of the lifting cylinder 13 corresponds to the limit value v SG .

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)
  • Fluid-Pressure Circuits (AREA)
EP20000108142 1999-05-10 2000-04-13 Dispositif de levage hydraulique Expired - Lifetime EP1052215B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999121629 DE19921629B4 (de) 1999-05-10 1999-05-10 Hydraulische Hubvorrichtung
DE19921629 1999-05-10

Publications (3)

Publication Number Publication Date
EP1052215A2 true EP1052215A2 (fr) 2000-11-15
EP1052215A3 EP1052215A3 (fr) 2005-09-21
EP1052215B1 EP1052215B1 (fr) 2012-02-15

Family

ID=7907668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000108142 Expired - Lifetime EP1052215B1 (fr) 1999-05-10 2000-04-13 Dispositif de levage hydraulique

Country Status (2)

Country Link
EP (1) EP1052215B1 (fr)
DE (1) DE19921629B4 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1188709A2 (fr) * 2000-09-18 2002-03-20 Still Gmbh Dispositif de levage
EP1239167A1 (fr) * 2001-03-07 2002-09-11 Dambach Lagersysteme GmbH & Co. KG Dispositif de levage hydraulique
DE102004039848A1 (de) * 2004-08-17 2006-03-09 Jungheinrich Ag Fluidschaltung und Flurförderzeug mit Fluidschaltung
EP2123594A1 (fr) * 2008-05-23 2009-11-25 BT Products AB Chariot élévateur industriel doté d'un contrôle de la vitesse
CN102116285A (zh) * 2010-01-05 2011-07-06 雷蒙德股份有限公司 监视物料运输车辆上液压泵的装置和方法
WO2020011957A1 (fr) * 2018-07-11 2020-01-16 Parker Hannifin Emea S.À.R.L. Ensemble soupape de commande pour véhicule de manutention de charge
US20220314848A1 (en) * 2021-04-02 2022-10-06 Mubeen Aziz Elevated Vehicle System

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10154449A1 (de) * 2001-11-06 2003-05-15 Dambach Lagersysteme Gmbh & Co Hydraulische Hubvorrichtung insbesondere für batteriegetriebene Flurförderzeuge und Verfahren zu deren Steuerung
DE102011016542A1 (de) * 2011-04-08 2012-10-11 Jungheinrich Aktiengesellschaft Flurförderzeug, insbesondere Schubmaststapler mit einem Hubgerüst

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548296A (en) * 1980-02-26 1985-10-22 Oil Drive Kogyo, Ltd. Hydraulic elevator
DE4416173A1 (de) * 1994-05-06 1995-11-09 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge oder dergleichen
DE4317782C2 (de) * 1993-05-28 1996-01-18 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen
EP0908413A2 (fr) * 1997-10-08 1999-04-14 Still Wagner GmbH & Co. KG Chariot élévateur avec un dispositif de prise de la charge et procédé pour descendre le dispositif de prise de la charge
DE19748782A1 (de) * 1997-11-05 1999-05-06 Clark Material Handling Gmbh Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2095861B (en) * 1981-03-31 1985-01-03 Toyoda Automatic Loom Works Fork lift control system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548296A (en) * 1980-02-26 1985-10-22 Oil Drive Kogyo, Ltd. Hydraulic elevator
DE4317782C2 (de) * 1993-05-28 1996-01-18 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen
DE4416173A1 (de) * 1994-05-06 1995-11-09 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge oder dergleichen
EP0908413A2 (fr) * 1997-10-08 1999-04-14 Still Wagner GmbH & Co. KG Chariot élévateur avec un dispositif de prise de la charge et procédé pour descendre le dispositif de prise de la charge
DE19748782A1 (de) * 1997-11-05 1999-05-06 Clark Material Handling Gmbh Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1188709A2 (fr) * 2000-09-18 2002-03-20 Still Gmbh Dispositif de levage
EP1188709A3 (fr) * 2000-09-18 2005-04-13 Still Gmbh Dispositif de levage
EP1239167A1 (fr) * 2001-03-07 2002-09-11 Dambach Lagersysteme GmbH & Co. KG Dispositif de levage hydraulique
DE102004039848A1 (de) * 2004-08-17 2006-03-09 Jungheinrich Ag Fluidschaltung und Flurförderzeug mit Fluidschaltung
US7441406B2 (en) 2004-08-17 2008-10-28 Jungheinrich Aktiengesellschaft Fluid circuit and industrial truck having a fluid circuit
WO2009141242A1 (fr) * 2008-05-23 2009-11-26 Bt Products Ab Chariot élévateur industriel avec commande de vitesse
EP2123594A1 (fr) * 2008-05-23 2009-11-25 BT Products AB Chariot élévateur industriel doté d'un contrôle de la vitesse
CN102116285A (zh) * 2010-01-05 2011-07-06 雷蒙德股份有限公司 监视物料运输车辆上液压泵的装置和方法
US20110162447A1 (en) * 2010-01-05 2011-07-07 John Bryant Kirk Apparatus and method for monitoring a hydraulic pump on a material handling vehicle
US8196464B2 (en) * 2010-01-05 2012-06-12 The Raymond Corporation Apparatus and method for monitoring a hydraulic pump on a material handling vehicle
AU2010257399B2 (en) * 2010-01-05 2014-05-22 The Raymond Corporation Apparatus and method for monitoring a hydraulic pump on a material handling vehicle
CN102116285B (zh) * 2010-01-05 2015-03-04 雷蒙德股份有限公司 监视物料运输车辆上液压泵的装置和方法
WO2020011957A1 (fr) * 2018-07-11 2020-01-16 Parker Hannifin Emea S.À.R.L. Ensemble soupape de commande pour véhicule de manutention de charge
US20220314848A1 (en) * 2021-04-02 2022-10-06 Mubeen Aziz Elevated Vehicle System

Also Published As

Publication number Publication date
DE19921629A1 (de) 2000-11-16
EP1052215B1 (fr) 2012-02-15
DE19921629B4 (de) 2005-05-25
EP1052215A3 (fr) 2005-09-21

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