EP0952355A2 - Hydraulische Einrichtung mit synchronisierten Betätigungsgliedern - Google Patents

Hydraulische Einrichtung mit synchronisierten Betätigungsgliedern Download PDF

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Publication number
EP0952355A2
EP0952355A2 EP99107796A EP99107796A EP0952355A2 EP 0952355 A2 EP0952355 A2 EP 0952355A2 EP 99107796 A EP99107796 A EP 99107796A EP 99107796 A EP99107796 A EP 99107796A EP 0952355 A2 EP0952355 A2 EP 0952355A2
Authority
EP
European Patent Office
Prior art keywords
chambers
cylinders
synchronization
oleodynamic
jacks
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.)
Withdrawn
Application number
EP99107796A
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English (en)
French (fr)
Other versions
EP0952355A3 (de
Inventor
Francesco Fiorese
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0952355A2 publication Critical patent/EP0952355A2/de
Publication of EP0952355A3 publication Critical patent/EP0952355A3/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to the production of an oleodynamic installation for actuating, raising and lowering maintenance bridges for vehicles, as well as the production of certain types of devices to be inserted in said installation.
  • lifting lifts ⁇ are well known, in particular those which consist of maintenance platforms for vehicles, actuated by means of a pressurized fluid, which regulates the stroke of the lifting cylinders.
  • This need therefore includes, on the part of the manufacturer, the application of safety systems capable of guaranteeing the synchronism, uphill and downhill, of all the platforms which are simultaneously in action.
  • the object of the invention is the production of a new system for ensuring synchronism in the platform lift which is more advantageous than analogous products already known; in particular it must be of simple construction, of limited cost, of minimal bulk and of total security.
  • the installation according to the invention has two distinct oleodynamic circuits: a so-called power circuit, which supplies the fluid under pressure to control the elevator actuator jacks and a synchronization circuit, which supplies the fluid under pressure to ensure the movement in synchronism of the moving parts.
  • the installation essentially provides that between the pump 1, which sucks the oil from the tank 2 and the plurality of elevation cylinders 3 ', 3' ', are synchronized synchronization cylinders 4', 4 ' '.
  • each synchronizing cylinder 4 is provided with two opposite oil chambers 5 and 6, which change volume under the effect of the displacement of the piston 7.
  • the projecting rods 8 of the synchronization jacks 4 are connected to each other by means of a rigid element 9 so that their strokes are always mutually identical.
  • the lower chambers 5 of the two synchronizing cylinders are supplied with the pressurized fluid from the pump 1, while the upper chambers 6 of these cylinders send the pressurized fluid to the chamber 10 ', 10' 'of the lifting cylinders 3 fitted with pistons 11 ', 11' '.
  • the installation is completed by a series of valves, having safety or control functions, inserted in the oleodynamic circuit, which is described in detail by means of the analysis of the different work phases.
  • the pressurized oil which passes through the solenoid valve 13, the flow control valve 14, and the two piloted non-return valves 15 and 16, will fill the lower chambers 5 ' , 5 '' of the two synchronizing cylinders 4 ', 4' 'which are intercommunicating by means of conduit 17.
  • the oil under pressure by progressively filling the two lower chambers 5, causes the displacement of the pistons 7 and the resulting output of the oil from the upper chambers 6 which will immediately fill the chambers 10 of the corresponding elevation cylinders 3, by means conduits 18 and 19, causing the displacement of the piston 11 and, consequently, the elevation of the bridge 12.
  • pilot operated non-return valves 20 ', 20' ' are installed, essential for safety, since the stop as a function of the load on the elevator is not achieved by mechanical means but is entrusted only to the oleodynamic circuit.
  • the oil is discharged from the chambers 10, by the opening of the piloted non-return valves 20, by means of the conduit 21 supplied by the solenoid valve 13.
  • the oil from the lifting cylinders 3 enters the upper chambers 6 of the synchronization cylinders 4, causing the retraction of the protruding rods 8, which, being rigidly connected together, guarantee that the descent of the lifting platform will always occur at the horizontal.
  • the moving parts of the lift are aligned horizontally by sending the oil under pressure also into the chambers 10 of the lifting cylinders 3 which cause their pistons 11 to bear against the cylinder head and cause the total output of the rods 26 'and 26' '.
  • the tap 23 is closed.
  • the corresponding piston 7 'of the synchronization cylinder 4 does not stop but continues the downhill race thanks to the mutual rigid connection established between its rod 8' and the rod 8 '' of the other synchronization cylinder 4 ' ', which continues to operate regularly.
  • the circuit is completed by the pressure limiting valves 29 and 30, placed upstream and downstream of the solenoid valve 13, and by the interception valves 31, 32 and 33 for discharging the entire installation. .
  • FIG. 2 A first method of construction of the synchronization cylinders 4 is shown in FIG. 2, or the identical reciprocal movement of the two rods 8 'and 8' 'of two jacks 7' and 7 '' is achieved by housing said jacks in a support structure 40, so that one of the two fasteners, for example l 'lower 41, is articulated on an axis 42 integral with said structure, while the other fastener 43, which corresponds to the end of the rod, is articulated on a traversing axis 44, wedged on lever arms 45, oscillating and articulated on a pin 46 supported by the aforementioned support structure.
  • one of the two fasteners for example l 'lower 41
  • the other fastener 43 which corresponds to the end of the rod
  • Fig. 4 shows a second possible embodiment for the synchronization cylinders 4, constituted by a single double-acting cylinder having as many pistons as there are corresponding elevation cylinders to control.
  • the jack is constituted by a jacket 50 and by a rod 51 which crosses the two heads and is provided with pistons 7 'and 7' '.
  • Fig. 5 shows another possible embodiment of the synchronization cylinders 4, constituted by three single-acting cylinders, that is to say by a main cylinder 60 and two secondary cylinders 61 and 62.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Harvester Elements (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Types And Forms Of Lifts (AREA)
EP99107796A 1998-04-23 1999-04-20 Hydraulische Einrichtung mit synchronisierten Betätigungsgliedern Withdrawn EP0952355A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI980082 1998-04-23
IT98VI000082A ITVI980082A1 (it) 1998-04-23 1998-04-23 Impianto oleodinamico per l'azionamento di ponti di servizio per il so llevamento di veicoli

Publications (2)

Publication Number Publication Date
EP0952355A2 true EP0952355A2 (de) 1999-10-27
EP0952355A3 EP0952355A3 (de) 2001-08-01

Family

ID=11426688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99107796A Withdrawn EP0952355A3 (de) 1998-04-23 1999-04-20 Hydraulische Einrichtung mit synchronisierten Betätigungsgliedern

Country Status (2)

Country Link
EP (1) EP0952355A3 (de)
IT (1) ITVI980082A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2353272A (en) * 1999-06-26 2001-02-21 Derek William Rowswell Levelling Jacking apparatus
WO2007059723A1 (de) * 2005-11-25 2007-05-31 Beab Brandenburg/H. Engineering & Anlagenbau Gmbh Gleichlaufeinrichtung für eine gruppe von hydraulischen arbeitszylindern
ITVI20100247A1 (it) * 2010-09-13 2012-03-14 Francesco Fiorese Dispositivo per il rilevamento del reciproco dislivello dei supporti del carico nei ponti sollevatori per veicoli
CN101749294B (zh) * 2008-12-02 2013-07-17 中南大学 一种实现负载均衡的液压同步驱动控制系统
CN110118207A (zh) * 2019-06-13 2019-08-13 吴瑜华 可精确输出多份等量高压动力液压油的气动增压装置
CN110529468A (zh) * 2019-09-16 2019-12-03 吴瑜华 可精确输出多份等量高压动力液压油的气动增压装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110541862B (zh) * 2019-09-16 2024-07-09 吴瑜华 可让多个油缸进行高精度同步运动的液压驱动系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR936570A (fr) * 1946-11-22 1948-07-23 Dispositif de commande hydraulique perfectionnée pour presses et autres machines actionnées par plusieurs cylindres
GB1121956A (en) * 1966-07-27 1968-07-31 Daikin Ind Ltd A synchronized hydraulic system
JPS60196411A (ja) * 1984-03-21 1985-10-04 Hitachi Ltd 同調シリンダ用油圧回路
JPS61127904A (ja) * 1984-11-28 1986-06-16 Hitachi Ltd 同調シリンダ用油圧回路
IT1187790B (it) * 1985-06-24 1987-12-23 Corghi Elettromecc Spa Impianto idraulico di comando per ponti sollevatori di automezzi in genere

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2353272A (en) * 1999-06-26 2001-02-21 Derek William Rowswell Levelling Jacking apparatus
WO2007059723A1 (de) * 2005-11-25 2007-05-31 Beab Brandenburg/H. Engineering & Anlagenbau Gmbh Gleichlaufeinrichtung für eine gruppe von hydraulischen arbeitszylindern
CN101749294B (zh) * 2008-12-02 2013-07-17 中南大学 一种实现负载均衡的液压同步驱动控制系统
ITVI20100247A1 (it) * 2010-09-13 2012-03-14 Francesco Fiorese Dispositivo per il rilevamento del reciproco dislivello dei supporti del carico nei ponti sollevatori per veicoli
CN110118207A (zh) * 2019-06-13 2019-08-13 吴瑜华 可精确输出多份等量高压动力液压油的气动增压装置
CN110529468A (zh) * 2019-09-16 2019-12-03 吴瑜华 可精确输出多份等量高压动力液压油的气动增压装置

Also Published As

Publication number Publication date
EP0952355A3 (de) 2001-08-01
ITVI980082A1 (it) 1999-10-23

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