EP0566203B1 - Dispositif avec des vérins hydrauliques synchronisés - Google Patents

Dispositif avec des vérins hydrauliques synchronisés Download PDF

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Publication number
EP0566203B1
EP0566203B1 EP19930201068 EP93201068A EP0566203B1 EP 0566203 B1 EP0566203 B1 EP 0566203B1 EP 19930201068 EP19930201068 EP 19930201068 EP 93201068 A EP93201068 A EP 93201068A EP 0566203 B1 EP0566203 B1 EP 0566203B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
conduit
valve
correction
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.)
Expired - Lifetime
Application number
EP19930201068
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German (de)
English (en)
Other versions
EP0566203A1 (fr
Inventor
Jan Berends
Jan Willem Fijnvandraat
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.)
Stertil BV
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Stertil BV
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Filing date
Publication date
Application filed by Stertil BV filed Critical Stertil BV
Publication of EP0566203A1 publication Critical patent/EP0566203A1/fr
Application granted granted Critical
Publication of EP0566203B1 publication Critical patent/EP0566203B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
    • B66F7/04—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars hydraulically or pneumatically operated
    • 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 a device comprising a hydraulic system with a source of hydraulic medium under pressure, a reservoir for the medium and at least two cylinder/piston assemblies connected in series in a master-slave circuit.
  • synchronous operating means comprise position sensors generating a signal corresponding with the extended position of each piston. These signals are processed by control means in order to correct a possible non-synchronous position of the pistons by feeding or draining medium.
  • the invention has for its object to improve such a device as known from the German "Offenlegungsschrift” 3 515 762.
  • a particularly favourable embodiment of the device is characterized in claim 2.
  • the pressure in the feed conduit to the first cylinder/piston assembly is with certainty always higher than in the connecting conduit in the most unfavourable load situation, so that the synchronous operating means can always function reliably.
  • step of claim 4 With the step of claim 4 is achieved that the correction can take place very uniformly and even undiscernibly.
  • the feed or drain of medium respectively to and from the connecting conduit takes place at a low speed.
  • the step of claim 5 is applied.
  • the control means act as safety means preventing the occurrence of a dangerous situation.
  • This step is particularly favourable when the device according to the invention is a vehicle lifting device.
  • the position sensors can herein be connected via vehicle supporting carriers to the piston rods so that when descent of one of the carriers is prevented by an obstacle the device is blocked.
  • control means can be embodied in simple manner. For ascent only the pump has to be switched on and for descent only the control valve has to be activated. This prevents different control means having to be operated simultaneously.
  • a very favourable embodiment of the device is characterized in claim 9.
  • the piston rods of the cylinder/piston assemblies are continuously tension loaded during operation so that driving only has to take place in the lifting device.
  • the descending movement can take place under the weight of the movable parts of the device.
  • the hydraulic system becomes exceptionally simple so that compared with the usual construction for such vehicle lifting devices, wherein the vehicle lifting members are mutually connected by chains or the like, a considerable simplification is realized.
  • the piston rods can only be tension loaded and never pressure loaded, whereby they do not have to be dimensioned for buckling, which enables a slim-line embodiment.
  • Figure 1 shows a hydraulic diagram of a device according to a first embodiment of the invention.
  • Figure 2 shows a hydraulic diagram corresponding with figure 1 of a second embodiment.
  • Figure 3 is a perspective view of a vehicle lifting device embodied as a device according to the invention.
  • the device 1 shown in figure 1 comprises a hydraulic system with a pump 2 which can be driven by an electric motor 3.
  • the pump 2 draws up hydraulic oil out of a reservoir 4 and can press it into a pressure conduit 7.
  • the latter is connected to a series connection of two cylinder/piston assemblies 5, 6.
  • Conduit 7 is connected to the first chamber 8 of cylinder 5 in the series connection.
  • the second chamber 9 of cylinder 5 is connected via a connecting conduit 10 to the first chamber 11 of second cylinder 6.
  • the second chamber 12 of this cylinder is not incorporated in the hydraulic circuit since piston rods 16, 17 of respectively cylinder 5 and 6 are tension loaded.
  • the downward stroke of piston rod 17 can be effected by this tension loading in a manner to be further described.
  • the second chamber 12 can in simple manner be in open communication with the environment or in communication with the oil reservoir.
  • the device comprises synchronous operating means which ensure that the mutual position of the piston rods 16 and 17 remains the same within narrow limits.
  • control means comprise position sensors which are formed in this embodiment by potentiometers 14 and 15. These potentiometers are connected to the respective piston rods 16 and 17 so that the rotational position of these potentiometers 14, 15 has a fixed relation to the extended position of piston rod 16 and 17.
  • Potentiometers 14 and 15 are connected to control means 13. These detect when the position sensors 14, 15 have a mutually differing position, which means that piston rods 16 and 17 have a mutually differing position. In the case the piston rod 17 lies in a lower position than piston rod 16, for instance because hydraulic oil has leaked out of the closed system of chamber 9, connecting conduit 10 and chamber 11, the control unit 13 will actuate opening of a first correction valve 18. A connection is hereby effected between conduit 7 and connecting conduit 10, or between the first chamber 8 and second chamber 9 of cylinder 5.
  • restriction 27 At normal operating pressures the restriction 27 will have to be narrower than restriction 28 since the pressure difference over restriction 27 is greater than that over restriction 28. In a simplified embodiment it is possible to suffice with one restriction in the conduit 19 which forms an optimum for both correction situations. As soon as a synchronous position has been reached the control unit 13 will close valve 20 once again.
  • the hydraulic system can be constructed from a per se known pump unit 25 which in addition to the above described elements also has an overpressure valve 24.
  • This pump unit 25 is connected via two hydraulic connections to a valve block 26 in which are arranged the valves 18 and 20.
  • Control unit 13 comprises a comparator which is self-evident to a skilled person and which at a determined minimal voltage difference between the output signal of potentiometers 14 and 15 in the one direction generates a control signal for the valve 18 and at a minimal voltage difference in the other direction generates a control signal for the valve 20.
  • the control signal for the "descent" valve 23 is generated in usual manner when a pressure switch (not shown) is pressed in.
  • the control valve 23 can, as shown, be provided with an additional hand control 39 so that in the case of power breakdown the device can be set in a rest position by hand.
  • safety valves 27, 28 respectively are also arranged in conduit 7 and in connecting conduit 10 which close the connection as soon as too high a flow speed occurs, for instance as a result of conduit breakage.
  • the signal of the position sensors 14 and 15 can also be used for other purposes.
  • the whole system can for instance be switched off if a position difference above a determined value is detected.
  • the descend option When a first value is exceeded the descend option is preferably switched off first. When a second, greater value is exceeded, the whole system is then switched off. A non-synchronous position caused because during descent the vehicle or a supporting arm of the bridge comes into contact with an obstacle such as a support can then be restored rapidly by switching the bridge to lift.
  • Figure 2 shows a circuit similar to that of figure 1 wherein corresponding components are designated with the same reference numerals.
  • two cylinder/piston assemblies 30, 31 are likewise present.
  • the piston rods 32, 33 respectively hereof are however not tension but pressure loaded.
  • the conduit 7 must of course be connected to chamber 34 of cylinder 30 which lies on the other side of piston rod 32.
  • the second chamber 35 of cylinder 30 is connected via connecting conduit 37 to the first chamber 36 of cylinder 31.
  • FIG. 3 shows an application of the invention as vehicle lifting device.
  • This vehicle lifting device 40 comprises two columns 41 and 42 in which carriages 45, 46 respectively are guided for vertical displacement. These carriages 45, 46 carry at their bottom end vehicle lifting members 43 and 44 respectively. Carriages 45, 46 with lifting members 43, 44 are moved up and downward in the columns 41, 42 by means of hydraulic cylinder/piston assemblies 47, 48. These cylinders 47 and 48 correspond with the cylinders 5 and 6 of figure 1. Cylinder 48 therefore has a greater diameter than cylinder 47 in order to obtain the described ratio. Cylinders 47 and 48 are "suspended" in the top of the columns 41, 42.
  • the respective piston rods 49, 50 extend downward and engage through the carriages 45, 46 onto supports 51, 52 close to the underside of carriages 45, 46.
  • the supports 51, 52 are embodied such that piston rods 49, 50 can protrude therethrough.
  • the piston rods bear on their bottom end a stop with which they engage on the underside onto the supports 51, 52.
  • the piston rods can slide through the openings in the supports 51, 52 so that these piston rods are not pressure loaded and are therefore not under buckling load.
  • each column 41, 42 Mounted in the top of each column 41, 42 is a potentiometer, whereof the potentiometer 53 in column 41 is shown.
  • This potentiometer 53 carries on its shaft a wire drum on which is wound a wire.
  • the wire drum is continuously loaded in winding direction by a wind-up spring.
  • the wire 54 is connected to a support 55 of carriage 45.
  • the potentiometer 53 and that in column 42 correspond with the potentiometers 14 and 15 of figure 1. As soon as a height difference occurs in the lifting members 43, 44 this is therefore detected by the potentiometers and oil is added or drained in the above described manner to correct the difference.
  • the invention is of course also applicable to other vehicle lifting devices, for instance four-column lifting devices, and in general to other devices wherein synchronous operation of piston rods of hydraulic cylinder/piston assemblies is desired.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (10)

  1. Dispositif (1) comprenant un système hydraulique avec une source (2) de fluide hydraulique sous pression, un réservoir (4) destiné au fluide, au moins deux ensembles cylindre/piston (5, 6), une soupape de commande (23) destinée à relier la source (2) ou le réservoir (4), au choix, avec les cylindres (5, 6), les cylindres étant montés en série, les cylindres présentant des dimensions telles que la surface active du piston dans les chambres (9, 11) des deux cylindres (5, 6) soit égale, les chambres étant directement reliées l'une à l'autre par une conduite de liaison (10), et des moyens opératoires synchrones comprenant des capteurs de position (14, 15) produisant un signal correspondant à la position étendue de chaque piston, une première soupape de correction (18) reliée à au moins une des deux liaisons du premier ensemble cylindre/piston (5) du montage en série, une deuxième soupape de correction (20) pouvant relier la conduite de liaison (10) avec le réservoir (4), et des moyens de commande (13) reliés aux capteurs de position (14, 15) et aux soupapes de correction (18, 20) , caractérisé en ce que la première soupape de correction (18) est susceptible de relier entre elles les deux conduites de liaison du premier ensemble cylindre/piston (5) du montage en série, et d'établir un écoulement entre la chambre (8) non reliée à la conduite de liaison (10) et la chambre (9) reliée à la conduite de liaison (10).
  2. Dispositif selon la revendication 1, dans lequel les ensembles cylindre/piston (5, 6) sont montés de telle sorte que leurs tiges de piston (16, 17) subissent continuellement des contraintes de traction en situation de fonctionnement.
  3. Dispositif selon la revendication 1, dans lequel les ensembles cylindre/piston (30, 31) sont montés de telle sorte que leurs tiges de piston (32, 33) subissent continuellement des contraintes de pression en situation de fonctionnement, le diamètre de la tige de piston du premier ensemble (30), dans le montage en série, étant inférieur à la moitié du diamètre du piston.
  4. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les étranglements (27, 28) sont placés dans des parties de conduites reliées aux soupapes de correction.
  5. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les moyens de commande (13) sont réalisés de telle sorte qu'ils empêchent le fonctionnement du dispositif lorsque la différence entre les signaux des capteurs de position (14, 15) dépasse une valeur seuil.
  6. Dispositif selon l'une quelconque des revendications précédentes, comprenant une conduite sous pression continue s'étendant entre la sortie de la pompe (2) et le montage en série des ensembles cylindre/piston (5, 6), la soupape de commande étant une soupape de fermeture (23) montée dans une conduite (22) conduisant au réservoir (4) et partant de cette conduite sous pression (7).
  7. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la soupape de commande (23) et les soupapes de correction (18, 20) sont des soupapes identiques.
  8. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les capteurs de position (14, 15) comprennent des potentiomètres (53), dont une tige porte un tambour pour fil métallique, et une extrémité d'un fil métallique (54) enroulée sur les tambours est reliée à un élément (55) relié de façon fixe aux tiges de piston respectives (49, 50), tandis que le tambour est chargé en continu, dans le direction d'enroulement, par un ressort enrouleur.
  9. Dispositif selon l'une quelconque des revendications précédentes, étant un dispositif de levage de véhicule comprenant au moins deux colonnes (41, 42) comportant des éléments (43, 44) de levage de véhicule montés sur elles pour un déplacement vertical, un ensemble cylindre/piston (47, 48) étant monté de façon suspendue dans chaque colonne, l'élément de levage de véhicule (43, 44) respectif étant suspendu à la tige de piston (49, 50) de celle-ci, qui dépasse en direction du bas.
  10. Dispositif selon la revendication 9, dans lequel la tige de piston porte une butée qui est active dans la direction du haut et la tige de piston est susceptible de coulisser vers le bas avec la butée, vis-à-vis de l'élément de levage de véhicule.
EP19930201068 1992-04-13 1993-04-13 Dispositif avec des vérins hydrauliques synchronisés Expired - Lifetime EP0566203B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9200686 1992-04-13
NL9200686A NL9200686A (nl) 1992-04-13 1992-04-13 Inrichting met gelijklopende hydraulische vijzels.

Publications (2)

Publication Number Publication Date
EP0566203A1 EP0566203A1 (fr) 1993-10-20
EP0566203B1 true EP0566203B1 (fr) 1997-07-09

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EP19930201068 Expired - Lifetime EP0566203B1 (fr) 1992-04-13 1993-04-13 Dispositif avec des vérins hydrauliques synchronisés

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EP (1) EP0566203B1 (fr)
DE (1) DE69311949T2 (fr)
NL (1) NL9200686A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10076931B2 (en) 2012-07-06 2018-09-18 Gerhard Finkbeiner Lifting device and method for installing and uninstalling a wheel using such a lifting device

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1264250B1 (it) * 1993-10-22 1996-09-23 Ravaglioli Spa "dispositivo sollevatore elettroidraulico per autoveicoli"
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
NL1011538C2 (nl) * 1999-03-11 2000-09-12 Stertil Bv Voertuighefinrichting.
NL1027870C2 (nl) * 2004-12-23 2006-06-26 Stertil Bv Hefsysteem.
ITVE20050030A1 (it) * 2005-05-18 2006-11-19 O Me R Spa Dispositivo sollevatore a colonne.
DE102006048002A1 (de) * 2006-10-09 2008-04-10 Mt-Energie Gmbh & Co. Kg Verfahren zum Steuern des Gleichlaufs von wenigstens zwei Druckmittelzylindern sowie Gleichlaufsteuerung
DE102007059304A1 (de) * 2007-12-07 2009-06-10 Otto Nussbaum Gmbh & Co. Kg Hebebühne für Kraftfahrzeuge
DE102009014951A1 (de) 2009-03-30 2010-10-14 Finkbeiner, Gerhard, Dipl.-Ing. Hebevorrichtung, insbesondere mobile Hebevorrichtung
US10208529B2 (en) 2009-06-23 2019-02-19 Higher Power Hydraulic Doors, Llc Tilt-up door
DE102011005120A1 (de) * 2011-03-04 2012-09-06 Bayerische Motoren Werke Aktiengesellschaft Fahrschienenhebebühne für Kraftfahrzeuge
CN103407933B (zh) * 2012-09-03 2017-05-31 希实本株式会社 具有同步功能的车辆升降装置
CN103883574A (zh) * 2012-12-20 2014-06-25 国家核电技术有限公司 液压多点同步控制系统
CN103591075B (zh) * 2013-11-29 2017-02-15 徐州重型机械有限公司 起重机、平衡重液压缸同步的液压控制系统
WO2016061797A1 (fr) * 2014-10-23 2016-04-28 南京迈瑞生物医疗电子有限公司 Système d'entraînement hydraulique pour table fonctionnelle
US11731865B2 (en) 2018-10-03 2023-08-22 Steve Green Modular configurable inground automotive lift system
CN113027676B (zh) * 2019-12-25 2022-10-04 新疆金风科技股份有限公司 风力发电机组的液压变桨控制方法和装置
CN113479814B (zh) * 2021-06-09 2022-09-13 哈尔滨理工大学 一种具有气弹簧及限位保护功能的电液伺服举升平台

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DE3439292A1 (de) * 1984-10-26 1986-05-07 Otto Nußbaum GmbH & Co KG, 7640 Kehl Hydraulisch betaetigte hubvorrichtung, insbesondere hebebuehne fuer kraftfahrzeuge
DE3515762A1 (de) * 1985-05-02 1986-11-06 Zippo Gesellschaft für Hebetechnik mbH, 7600 Offenburg Mehrsaeulen-hebebuehe od. dgl. und verfahren zur gleichlaufsteuerung ihrer hubelemente

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10076931B2 (en) 2012-07-06 2018-09-18 Gerhard Finkbeiner Lifting device and method for installing and uninstalling a wheel using such a lifting device

Also Published As

Publication number Publication date
NL9200686A (nl) 1993-11-01
EP0566203A1 (fr) 1993-10-20
DE69311949T2 (de) 1997-11-13
DE69311949D1 (de) 1997-08-14

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