EP0724541A1 - Dispositif de levage electrohydraulique - Google Patents

Dispositif de levage electrohydraulique

Info

Publication number
EP0724541A1
EP0724541A1 EP95900254A EP95900254A EP0724541A1 EP 0724541 A1 EP0724541 A1 EP 0724541A1 EP 95900254 A EP95900254 A EP 95900254A EP 95900254 A EP95900254 A EP 95900254A EP 0724541 A1 EP0724541 A1 EP 0724541A1
Authority
EP
European Patent Office
Prior art keywords
synchronising
lifting device
pipe
sensor means
aimed
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
EP95900254A
Other languages
German (de)
English (en)
Other versions
EP0724541B1 (fr
Inventor
Fausto Manganelli
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.)
Ravaglioli SpA
Original Assignee
Ravaglioli SpA
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 SpA filed Critical Ravaglioli SpA
Publication of EP0724541A1 publication Critical patent/EP0724541A1/fr
Application granted granted Critical
Publication of EP0724541B1 publication Critical patent/EP0724541B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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)
  • General Induction Heating (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
  • Elevator Control (AREA)
  • Earth Drilling (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.
EP95900254A 1993-10-22 1994-10-19 Dispositif de levage electrohydraulique Expired - Lifetime EP0724541B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT93BO000420A IT1264249B1 (it) 1993-10-22 1993-10-22 "sollevatore elettroidraulico"
ITBO930420 1993-10-22
PCT/IT1994/000175 WO1995011189A1 (fr) 1993-10-22 1994-10-19 Dispositif de levage electrohydraulique

Publications (2)

Publication Number Publication Date
EP0724541A1 true EP0724541A1 (fr) 1996-08-07
EP0724541B1 EP0724541B1 (fr) 1999-02-03

Family

ID=11339277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95900254A Expired - Lifetime EP0724541B1 (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)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5597987A (en) * 1995-01-25 1997-01-28 Delaware Capital Formation, Inc. Twin post, telescoping jack hydraulic elevator system
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
ITVI980165A1 (it) * 1998-09-07 2000-03-07 Francesco Fiorese Circuito oleodinamico per l'azionamento di ponti di servizio per il sollevamento di veicoli
DE20104140U1 (de) 2001-03-09 2001-08-16 MAHA Maschinenbau Haldenwang GmbH & Co. KG, 87490 Haldenwang Hebebühne für zweispurige Kraftfahrzeuge
SE521586C2 (sv) * 2001-08-06 2003-11-18 Norba Ab Arrangemang för inlastning av material
US6763916B2 (en) 2002-04-12 2004-07-20 Delaware Capital Formation, Inc. Method and apparatus for synchronizing a vehicle lift
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
DE102008021149A1 (de) * 2008-04-28 2009-10-29 Maha Maschinenbau Haldenwang Gmbh & Co. Kg Hebevorrichtung
DE102009056077B4 (de) * 2009-11-30 2020-01-09 Hs Fahrzeugbau Gmbh Entsorgungsfahrzeug mit zumindest einer Zuführungseinrichtung für zwei Müllbehälter
DE102010040671A1 (de) * 2010-09-13 2012-03-15 Maha Maschinenbau Haldenwang Gmbh & Co. Kg Hebebühne
US10087958B2 (en) 2012-04-19 2018-10-02 Cascade Corporation Fluid power control system for mobile load handling equipment
DE102013103861A1 (de) 2013-04-17 2014-11-06 Herrmann Ag Hebebühne mit hydraulischer Kopplung der Hubstempel
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
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
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
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
US10246313B2 (en) 2015-07-31 2019-04-02 Vehicle Service Group, Llc Precast concrete pit
US10227222B2 (en) 2015-07-31 2019-03-12 Vehicle Service Group, Llc Precast concrete pit
CA2998893A1 (fr) * 2017-03-23 2018-09-23 The Raymond Corporation Systemes et methodes de stabilisation de mat sur un vehicule de transport de materiau

Family Cites Families (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
IT1187790B (it) * 1985-06-24 1987-12-23 Corghi Elettromecc Spa Impianto idraulico di comando per ponti sollevatori di automezzi in genere
AT385466B (de) * 1985-12-30 1988-04-11 Hoerbiger Hydraulik Gleichlaufregeleinrichtung fuer einen hydraulischen mehrzylinderantrieb
DE3907441A1 (de) * 1989-03-08 1990-09-13 Otto Lift Systeme Gmbh Vorrichtung zum entleeren von insbesondere muellbehaeltern

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9511189A1 *

Also Published As

Publication number Publication date
ITBO930420A1 (it) 1995-04-22
ITBO930420A0 (it) 1993-10-22
AU8114594A (en) 1995-05-08
ATE176452T1 (de) 1999-02-15
IT1264249B1 (it) 1996-09-23
WO1995011189A1 (fr) 1995-04-27
TW267992B (fr) 1996-01-11
DE69416422D1 (de) 1999-03-18
EP0724541B1 (fr) 1999-02-03

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