WO1995011189A1 - Dispositif de levage electrohydraulique - Google Patents

Dispositif de levage electrohydraulique Download PDF

Info

Publication number
WO1995011189A1
WO1995011189A1 PCT/IT1994/000175 IT9400175W WO9511189A1 WO 1995011189 A1 WO1995011189 A1 WO 1995011189A1 IT 9400175 W IT9400175 W IT 9400175W WO 9511189 A1 WO9511189 A1 WO 9511189A1
Authority
WO
WIPO (PCT)
Prior art keywords
synchronising
lifting device
pipe
sensor means
aimed
Prior art date
Application number
PCT/IT1994/000175
Other languages
English (en)
Inventor
Fausto Manganelli
Original Assignee
Ravaglioli S.P.A.
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.)
Filing date
Publication date
Application filed by Ravaglioli S.P.A. filed Critical Ravaglioli S.P.A.
Priority to EP95900254A priority Critical patent/EP0724541B1/fr
Priority to DE69416422T priority patent/DE69416422D1/de
Priority to AU81145/94A priority patent/AU8114594A/en
Publication of WO1995011189A1 publication Critical patent/WO1995011189A1/fr

Links

Classifications

    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
    • B66F7/20—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by several jacks with means for maintaining the platforms horizontal during movement

Definitions

  • the invention relates to an electrohydraulic lifting device, in particular a heavy load lifting device including two support platforms, wherein raising and lowering of each support platform are controlled independently from the other platform and, when necessary, compensated, e.g. when a dif ⁇ ference occurs in the heights of the two support platforms.
  • a compensation electrohydraulic system is controlled by an electronic control unit that oper- ates in real-time.
  • Electrohydraulic lifting devices which include support platforms and are adapted to raise and lower a load that has been put onto the platforms.
  • This kind of lifting devices basically in ⁇ clude: - two support platforms, which are parallel to each other and supported by related structures indepen ⁇ dent from each other.
  • the structures are made in a way so as to define for the support platforms two extreme positions, namely a lowered position and a raised position,- - one, or more than one, hydraulic cylinders for each of the support platforms, the cylinders being independently fed through respective parallel con ⁇ duits (including cutoff solenoid valves) .
  • the stems of the cylinders are synchronically moved as a consequence of a rigid mechanical link connected to the means actuated by the same stems,-
  • an electrohydraulic control unit connected to the cylinders of each pair via an oil flow splitting valve.
  • the task of this last valve, during either the feeding or discharge, is to subdivide the oil volume displaced into smaller equal volumes which are delivered to two pipes each of which splits into two branches connected to the related cylinders of the respective platforms.
  • the above mentioned lifting device has a problem in keeping the platforms in alignment with each other, with respect to a horizontal plane, and this problem has never been easy to solve.
  • a difference can occur in the flow of hydrau ⁇ lic pressure media delivered to the above mentioned pairs of cylinders through the said conduits, when one of the two conduits presents a hydraulic flow resistance different from the other one.
  • This difference in flow resistance is caused either by the load not being regularly distributed on the support platforms, or by small defects in designing and manufacturing the hydraulic circuits and the mechanical-electromechanical components of the lifting device.
  • the two platforms locate at different height levels, and the load takes an inclined position in accordance with this differ- ence.
  • a further known device includes a transversal link between the two of the support platforms, this link including mechanical means, such as torsional bars.
  • the main object of the present invention is to find a solution to these problems, that is to the horizontal nonalignment of one platform in respect of the other one that occurs during the raising and lowering stages in an electrohydraulic lifting de- vice, without providing any mechanical transversal link between the two of the support platforms.
  • each platform is checked second by second and any adjustment, necessary to set again the platforms in reciprocal alignment, is immediate ⁇ ly carried out.
  • an electrohydraulic lifting device includ ⁇ ing: at least two support platforms set substantially parallel to each other and carried by related struc- tures made in such a way as to define two extreme positions for the platforms, namely a lowered posi ⁇ tion and a raised position respectively; at least two hydraulic cylinders, namely a first cylinder and a second cylinder, each arranged for operating a respective one of the said structures,- a flow splitting valve connected at one side to pipes, namely a first pipe and a second pipe each connected to a related one of the said hydraulic cylinders,- an electro-hydraulic central unit connected, through a main conduit, to the other side of the said flow splitting valve and provided for feeding the said hydraulic cylinders,- a first duct aimed at connecting said first pipe with said main conduit, via a first synchronising solenoid valve,- a second duct aimed at connecting said second pipe with said main .conduit, via a second synchronising solenoid valve,
  • reference numeral 1 and 2 indicate two support platforms, generally alike one to the other, that are carried by respective support structures.
  • the support structures are not illustrated in the drawing as they are well known, made like the ones cited in the prior art statement.
  • the platforms 1, 2 are indirectly moved by related pairs 10, 20 of hydraulic cylinders 3, 4, namely a first pair and a second pair.
  • the cylinders 3 of the first pair 10 are connected to related conduits 5 that include respec ⁇ tive cutoff solenoid valves 6 and that converge to a branch point 7 of a first pipe 8.
  • the pipes 8 and 13 are connected to a flow splitting valve 14 that is in turn connected to a main duct 15 departing from an electrohydraulic unit 50, of known type.
  • the first pipe 8 is also connected to the main duct 15 via a first channel 30.
  • This connection is set or removed by means of a first synchronisation solenoid valve 31, and a necking 42.
  • the synchronising solenoid valve 31, 41 are controlled by an electronic control unit 100, that is connected to sensor means first 17 and second 18 respectively adapted to detect, second by second, the length of each of the part of the stems 3a and 4a that is outside the respective cylinder.
  • these sensor means are positioned near the stems.
  • the electronic unit 100 processes the signals delivered by the sensor means 17, 18 in order to estimate how much the stems 3a, 4a have come out of the cylinders.
  • This operating style is performed until the difference in the coming out of the stems 4a, 3a take a value less than the tolerance that has been prefixed.
  • each of the support platforms can be moved either by only one hydraulic cylinder or by more that two hydraulic cylinders.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Jib Cranes (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • General Induction Heating (AREA)
  • Earth Drilling (AREA)
  • Elevator Control (AREA)

Abstract

L'invention propose un remède à l'absence d'alignement sur l'horizontale des deux plates-formes (1, 2) de support propres à un dispositif de levage électrohydraulique. Cette absence d'alignement survient pendant les phases de montée et de descente, et l'invention permet de contrôler en continu la hauteur des plates-formes (1, 2) de support et d'effectuer rapidement les ajustements nécessaires pour qu'elles soient à nouveau alignées l'une sur l'autre.
PCT/IT1994/000175 1993-10-22 1994-10-19 Dispositif de levage electrohydraulique WO1995011189A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP95900254A EP0724541B1 (fr) 1993-10-22 1994-10-19 Dispositif de levage electrohydraulique
DE69416422T DE69416422D1 (de) 1993-10-22 1994-10-19 Elektrohydraulische hebevorrichtung
AU81145/94A AU8114594A (en) 1993-10-22 1994-10-19 Electrohydraulic lifting device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93BO000420A IT1264249B1 (it) 1993-10-22 1993-10-22 "sollevatore elettroidraulico"
ITBO93A000420 1993-10-22

Publications (1)

Publication Number Publication Date
WO1995011189A1 true WO1995011189A1 (fr) 1995-04-27

Family

ID=11339277

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1994/000175 WO1995011189A1 (fr) 1993-10-22 1994-10-19 Dispositif de levage electrohydraulique

Country Status (7)

Country Link
EP (1) EP0724541B1 (fr)
AT (1) ATE176452T1 (fr)
AU (1) AU8114594A (fr)
DE (1) DE69416422D1 (fr)
IT (1) IT1264249B1 (fr)
TW (1) TW267992B (fr)
WO (1) WO1995011189A1 (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297309A (en) * 1995-01-25 1996-07-31 Capital Formation Inc Dual Multi-stage Hydraulic Jack Elevator
DE19709474A1 (de) * 1997-03-07 1998-09-10 Rexroth Mannesmann Gmbh Hydraulische Hubeinrichtung
WO1999043954A1 (fr) * 1998-02-27 1999-09-02 Voith Hydro Gmbh & Co. Kg Systeme de commande de vanne annulaire pour turbine francis
EP0985830A1 (fr) * 1998-09-07 2000-03-15 Francesco Fiorese Circuit oléodynamique pour l'actionnement de ponts de service pour le levage de véhicules
WO2003086942A2 (fr) * 2002-04-12 2003-10-23 Delaware Capital Formation, Inc. Procede et appareil de synchronisation d'un elevateur de vehicules
NO20040335L (no) * 2001-08-06 2004-01-26 Norba Ab Arrangement for innlasting av materiale.
US7150073B2 (en) 2004-04-27 2006-12-19 Delaware Capital Formation, Inc. Hinge pin
CN1299968C (zh) * 2003-08-06 2007-02-14 机械工业部西安重型机械研究所 中间罐四缸液压升降装置
DE102009056077A1 (de) * 2009-11-30 2011-06-01 HN Schörling GmbH Entsorgungsfahrzeug mit zumindest einer Zuführungseinrichtung für zwei Müllbehälter
EP2428481A1 (fr) * 2010-09-13 2012-03-14 MAHA Maschinenbau Haldenwang GmbH & Co. KG Pont elévateur
US8262064B2 (en) 2008-04-28 2012-09-11 Maha Maschinenbau Haldenwang Gmbh & Co. Kg Lifting device
WO2013158199A1 (fr) 2012-04-19 2013-10-24 Cascade Corporation Système de commande à transmission d'énergie par fluide pour équipement de manipulation de charge mobile
DE102013103861A1 (de) * 2013-04-17 2014-11-06 Herrmann Ag Hebebühne mit hydraulischer Kopplung der Hubstempel
CN104500486A (zh) * 2014-12-31 2015-04-08 中联重科股份有限公司 双路压力系统及其均压装置、双活塞缸设备和提升系统
JP2016003696A (ja) * 2014-06-16 2016-01-12 日本機器鋼業株式会社 油圧式昇降機の安全装置
US10227222B2 (en) 2015-07-31 2019-03-12 Vehicle Service Group, Llc Precast concrete pit
US10246313B2 (en) 2015-07-31 2019-04-02 Vehicle Service Group, Llc Precast concrete pit
US10604391B2 (en) * 2017-03-23 2020-03-31 The Raymond Corporation Systems and methods for mast stabilization on a material handling vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103708376B (zh) * 2013-12-17 2015-09-23 天津大学 大型甲板片大位移同步顶升控制结构
CN104930002B (zh) * 2015-06-12 2017-01-25 中国建筑股份有限公司 液压同步马达式液压控制台

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3336713A1 (de) * 1983-10-08 1985-04-25 Mannesmann Rexroth GmbH, 8770 Lohr Gleichlaufregelung fuer hydraulische mehrzylinderantriebe
EP0206382A2 (fr) * 1985-06-24 1986-12-30 CORGHI ELETTROMECCANICA S.p.A. Système hydraulique pour commander des ponts de voiture en général
EP0231735A1 (fr) * 1985-12-30 1987-08-12 HOERBIGER HYDRAULIK GmbH Dispositif de synchronisation pour l'entraînement hydraulique à multiples cylindres
EP0386569A1 (fr) * 1989-03-08 1990-09-12 OTTO LIFT-SYSTEME GmbH Dispositif pour vider des récipients, en particulier d'ordures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3336713A1 (de) * 1983-10-08 1985-04-25 Mannesmann Rexroth GmbH, 8770 Lohr Gleichlaufregelung fuer hydraulische mehrzylinderantriebe
EP0206382A2 (fr) * 1985-06-24 1986-12-30 CORGHI ELETTROMECCANICA S.p.A. Système hydraulique pour commander des ponts de voiture en général
EP0231735A1 (fr) * 1985-12-30 1987-08-12 HOERBIGER HYDRAULIK GmbH Dispositif de synchronisation pour l'entraînement hydraulique à multiples cylindres
EP0386569A1 (fr) * 1989-03-08 1990-09-12 OTTO LIFT-SYSTEME GmbH Dispositif pour vider des récipients, en particulier d'ordures

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297309B (en) * 1995-01-25 1998-07-15 Capital Formation Inc Dual post telescoping jack hydraulic elevator system
GB2297309A (en) * 1995-01-25 1996-07-31 Capital Formation Inc Dual Multi-stage Hydraulic Jack Elevator
DE19709474A1 (de) * 1997-03-07 1998-09-10 Rexroth Mannesmann Gmbh Hydraulische Hubeinrichtung
WO1999043954A1 (fr) * 1998-02-27 1999-09-02 Voith Hydro Gmbh & Co. Kg Systeme de commande de vanne annulaire pour turbine francis
CN1084439C (zh) * 1998-02-27 2002-05-08 沃依特·海德罗两合公司 轴向辐流式水轮机环形闸门控制系统
EP0985830A1 (fr) * 1998-09-07 2000-03-15 Francesco Fiorese Circuit oléodynamique pour l'actionnement de ponts de service pour le levage de véhicules
EP1465822A1 (fr) * 2001-08-06 2004-10-13 Norba AB Agencement pour le chargement de materiau
NO20040335L (no) * 2001-08-06 2004-01-26 Norba Ab Arrangement for innlasting av materiale.
WO2003086942A3 (fr) * 2002-04-12 2004-03-04 Capital Formation Inc Procede et appareil de synchronisation d'un elevateur de vehicules
US6763916B2 (en) 2002-04-12 2004-07-20 Delaware Capital Formation, Inc. Method and apparatus for synchronizing a vehicle lift
US6964322B2 (en) 2002-04-12 2005-11-15 Delaware Capital Formation, Inc. Method and apparatus for synchronizing a vehicle lift
WO2003086942A2 (fr) * 2002-04-12 2003-10-23 Delaware Capital Formation, Inc. Procede et appareil de synchronisation d'un elevateur de vehicules
CN1299968C (zh) * 2003-08-06 2007-02-14 机械工业部西安重型机械研究所 中间罐四缸液压升降装置
US7150073B2 (en) 2004-04-27 2006-12-19 Delaware Capital Formation, Inc. Hinge pin
US8262064B2 (en) 2008-04-28 2012-09-11 Maha Maschinenbau Haldenwang Gmbh & Co. Kg Lifting device
EP2113482B1 (fr) * 2008-04-28 2013-02-27 MAHA Maschinenbau Haldenwang GmbH & Co. KG Dispositif de levage
DE102009056077A1 (de) * 2009-11-30 2011-06-01 HN Schörling GmbH Entsorgungsfahrzeug mit zumindest einer Zuführungseinrichtung für zwei Müllbehälter
DE102009056077B4 (de) * 2009-11-30 2020-01-09 Hs Fahrzeugbau Gmbh Entsorgungsfahrzeug mit zumindest einer Zuführungseinrichtung für zwei Müllbehälter
EP2428481A1 (fr) * 2010-09-13 2012-03-14 MAHA Maschinenbau Haldenwang GmbH & Co. KG Pont elévateur
US10087958B2 (en) 2012-04-19 2018-10-02 Cascade Corporation Fluid power control system for mobile load handling equipment
JP2015514946A (ja) * 2012-04-19 2015-05-21 カスケード コーポレイションＣａｓｃａｄｅ Ｃｏｒｐｏｒａｔｉｏｎ 移動積荷取り扱い装置用の流体圧制御システム
EP2839171A4 (fr) * 2012-04-19 2016-01-20 Cascade Corp Système de commande à transmission d'énergie par fluide pour équipement de manipulation de charge mobile
WO2013158199A1 (fr) 2012-04-19 2013-10-24 Cascade Corporation Système de commande à transmission d'énergie par fluide pour équipement de manipulation de charge mobile
US9528533B2 (en) 2013-04-17 2016-12-27 Herrmann Ag Lifting platform with hydraulic coupling of the lifting rams
DE102013103861A1 (de) * 2013-04-17 2014-11-06 Herrmann Ag Hebebühne mit hydraulischer Kopplung der Hubstempel
JP2016003696A (ja) * 2014-06-16 2016-01-12 日本機器鋼業株式会社 油圧式昇降機の安全装置
CN104500486A (zh) * 2014-12-31 2015-04-08 中联重科股份有限公司 双路压力系统及其均压装置、双活塞缸设备和提升系统
CN104500486B (zh) * 2014-12-31 2017-01-25 中联重科股份有限公司 双路压力系统及其均压装置、双活塞缸设备和提升系统
US10227222B2 (en) 2015-07-31 2019-03-12 Vehicle Service Group, Llc Precast concrete pit
US10246313B2 (en) 2015-07-31 2019-04-02 Vehicle Service Group, Llc Precast concrete pit
US10604391B2 (en) * 2017-03-23 2020-03-31 The Raymond Corporation Systems and methods for mast stabilization on a material handling vehicle

Also Published As

Publication number Publication date
EP0724541A1 (fr) 1996-08-07
EP0724541B1 (fr) 1999-02-03
IT1264249B1 (it) 1996-09-23
ITBO930420A0 (it) 1993-10-22
AU8114594A (en) 1995-05-08
DE69416422D1 (de) 1999-03-18
TW267992B (fr) 1996-01-11
ATE176452T1 (de) 1999-02-15
ITBO930420A1 (it) 1995-04-22

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