EP1462662A1 - Control device for hydraulic displacement provided with pneumatic means to detect the position without leakage - Google Patents

Control device for hydraulic displacement provided with pneumatic means to detect the position without leakage Download PDF

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Publication number
EP1462662A1
EP1462662A1 EP04360025A EP04360025A EP1462662A1 EP 1462662 A1 EP1462662 A1 EP 1462662A1 EP 04360025 A EP04360025 A EP 04360025A EP 04360025 A EP04360025 A EP 04360025A EP 1462662 A1 EP1462662 A1 EP 1462662A1
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EP
European Patent Office
Prior art keywords
hydraulic cylinder
piston
detection means
orifice
rod
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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
EP04360025A
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German (de)
French (fr)
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EP1462662B1 (en
Inventor
Gérard Ripp
Gilbert Sprauel
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Usines Quiri & Cie Sa Ste
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Usines Quiri & Cie Sa Ste
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Publication of EP1462662A1 publication Critical patent/EP1462662A1/en
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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
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches

Definitions

  • the present invention relates to the field of fixing and positioning of parts on machine tools, in particular working at high speed, especially clamping and abutment of parts at by means of hydraulic displacement control devices provided with pneumatic position detection means and has for its object such device provided with means for controlling the displacement positions.
  • these devices are provided with position detectors which often consist of sets tires cooperating alternately in the two positions of the cylinders with means for closing the pneumatic circuits of these assemblies.
  • the pneumatic assemblies are in the form of circuits independent tires supplied alternately by a central of energy and each opening at one end of a chamber extending in extension of the hydraulic cylinder.
  • This hydraulic cylinder is connected, in said chamber, to a drawer movable in common with said cylinder hydraulic, so that said drawer is positioned in each position of the cylinder in front of a corresponding orifice of one of the pneumatic circuits.
  • the power station automatically delivers compressed air in the pneumatic circuit corresponding to the end of the chamber concerned and the presence of the drawer in front of the opening of the pneumatic duct corresponding causes a pressure rise in the circuit pneumatic, this pressure rise being verified by means of a pressure switch that issues an authorization signal for the machining operation or next handling.
  • the object of the present invention is to overcome these drawbacks by proposing a hydraulic displacement control device provided with pneumatic detection means of the cylinder positions allowing a more precise control of travel positions and smooth operation noise, without air leakage and perfectly clean.
  • the pneumatic position detection means of the cylinder which are in the form of two pneumatic circuits opening out each through an outlet port at one end of a pneumatic chamber in axial extension of a hydraulic cylinder parallel to the axis longitudinal of said chamber, each cooperating in a position of hydraulic cylinder, with a common sealing device, by pressure controlled, from the corresponding outlet, connected in displacement with the piston of the hydraulic cylinder.
  • Figure 1 of the accompanying drawings shows, by way of example, a hydraulic displacement control device in the form of a jack hydraulic 1, provided with means 2, 2 ′ for detecting the positions of the jack, which are in the form of two pneumatic circuits each opening out by a outlet port at one end of a pneumatic chamber 3 in axial extension of the hydraulic cylinder 1.
  • the means 2, 2 ′ for detecting the positions of the jack open into the pneumatic chamber 3 along an axis parallel to the longitudinal axis of said chamber 3 and each cooperate in a position of the jack hydraulic, with a common sealing device 4, by pressure controlled, from the corresponding outlet, connected in displacement with the piston of the hydraulic cylinder 1.
  • the common device 4 tight closure by controlled pressure is advantageously presented in the form of an element provided on two opposite faces with support means 5 and 6 intended to effect a sealed closure by pressure of the orifice of outlet of the pneumatic circuit 2, 2 ′ corresponding in each position of the cylinder.
  • one, 5, means support forming the common sealing device 4, cooperating with means 2, is in the form of an annular piece clamped on the end of a rod 7 secured to the piston of the hydraulic cylinder 1 and having an elastic deformation capacity
  • the other means support 6 is constituted by a pusher mounted in the rod 7 of the piston of the hydraulic cylinder 1 with possibility of displacement against a spring return 8 and closing, by a part 6 'projecting from said rod 7, in the corresponding position of the piston of the hydraulic cylinder 1, the outlet port of the corresponding 2 ′ means.
  • the means support 5 is pressed on the outlet of the pneumatic circuit forming the detection means 2 and closes this circuit perfectly waterproof, so that this circuit can be pressurized very quickly and can be detected by the corresponding control pressure switch. The latter can then issue a position certification signal corresponding end of the piston.
  • the orifice of the detection means 2 'cooperating with the part 6' of the pusher forming the support means 6 may appear, as shown Figures 1 and 2 of the accompanying drawings, in the form of a non-return valve provided with a guide rod 9 on which rests, in the extreme position corresponding to the piston of the hydraulic cylinder 1, the part 6 'projecting out of said rod 7 of the support means 6.
  • the support means 6 is in contact with the rod 9 of the non-return valve, so that the body of the latter closes completely and tightly the corresponding outlet of the pneumatic circuit 2 '.
  • Hydraulic displacement control devices of this type are usually constructed in such a way that in one of positions of the hydraulic cylinder piston, the limit switch corresponding either in actuation position, the other position detector limit switch being adjustable so that the useful stroke of the hydraulic cylinder piston.
  • the non-return valve forming the orifice of the means of detection 2 'cooperating with part 6' of the pusher forming the means support 6 can advantageously be mounted in the corresponding end of the pneumatic chamber 3 so as to be adjustable in position.
  • by this same adjustment and counts given the length of the protruding part 6 'it will be possible to take into account the overtravel of the cylinder in the absence of an obstacle normally expected such as a part, so that the protection of the jack and in particular of the support means 6 and corresponding detection means 2 'remains ensured.
  • the return spring 8 acting on the support means 6 is calibrated with a force greater than that of detachment of the non-return valve under the maximum pressure available in the pneumatic circuit of the means 2 '.
  • the support means 6 can also be provided, on its part 6 'projecting from the rod 7 connected to the piston of the hydraulic cylinder 1 a tight closing device by pressure of the outlet orifice of the corresponding 2 'detection means.
  • This waterproof closing device may, for example, be in the form of a membrane or a valve resting directly on the outlet of the detection means 2 'and cooperating with this orifice by slight elastic deformation or by form.
  • each detection means 2, 2 'in the pneumatic chamber 3 a non-return valve actuated in the corresponding position by a elastically deformable device with preload.
  • the elastically deformable device could be in the form of a leaf spring fixed on a rod connected to the piston of the hydraulic cylinder and supported by its free end on the guide rod of the non-return valves.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Abstract

The device has two pneumatic detecting circuits (2, 2) for detecting positions of a hydraulic cylinder (1). Each circuit opens inside a pneumatic chamber (3) following an axis parallel to a longitudinal axis of the chamber, by an outlet orifice. Each circuit coordinates with a common device (4) for tight closure of the orifice linked with a piston of the cylinder.

Description

La présente invention concerne le domaine de la fixation et du positionnement de pièces sur des machines-outils, en particulier travaillant à cadence élevée, notamment le bridage et la mise en butée de pièces au moyen de dispositifs à commande de déplacement hydraulique munis de moyens de détection pneumatique des positions et a pour objet un tel dispositif pourvu de moyens de contrôle des positions de déplacement.The present invention relates to the field of fixing and positioning of parts on machine tools, in particular working at high speed, especially clamping and abutment of parts at by means of hydraulic displacement control devices provided with pneumatic position detection means and has for its object such device provided with means for controlling the displacement positions.

Les moyens de bridage et de mise en butée de pièces, ainsi que d'autres dispositifs de mise en butée, par exemple anti-vibratoires, se présentent généralement sous forme de vérins hydrauliques à double effet, à déplacement linéaire et/ou rotatif et permettent un serrage efficace ou un positionnement précis de pièces à usiner ou autres.The means of clamping and abutment of parts, as well as other abutment devices, for example anti-vibration devices, generally present in the form of double-acting hydraulic cylinders, linear and / or rotary movement and allow efficient clamping or precise positioning of workpieces or others.

Pour assurer la précision d'un positionnement ou encore la certitude d'un serrage efficace de bridage, ces dispositifs sont munis de détecteurs des positions qui consistent souvent en des ensembles pneumatiques coopérant alternativement dans les deux positions des vérins avec un moyen de fermeture des circuits pneumatiques de ces ensembles.To ensure the accuracy of a positioning or the certainty of an effective clamping clamping, these devices are provided with position detectors which often consist of sets tires cooperating alternately in the two positions of the cylinders with means for closing the pneumatic circuits of these assemblies.

Les ensembles pneumatiques sont sous forme de circuits pneumatiques indépendants alimentés alternativement par une centrale d'énergie et débouchant chacun à une extrémité d'une chambre s'étendant en prolongement du vérin hydraulique. Ce vérin hydraulique est relié, dans ladite chambre, à un tiroir déplaçable en commun avec ledit vérin hydraulique, de sorte que ledit tiroir se positionne dans chaque position du vérin devant un orifice correspondant de l'un des circuits pneumatiques.The pneumatic assemblies are in the form of circuits independent tires supplied alternately by a central of energy and each opening at one end of a chamber extending in extension of the hydraulic cylinder. This hydraulic cylinder is connected, in said chamber, to a drawer movable in common with said cylinder hydraulic, so that said drawer is positioned in each position of the cylinder in front of a corresponding orifice of one of the pneumatic circuits.

Lorsque le vérin hydraulique arrive dans l'une ou l'autre position, la centrale d'énergie délivre automatiquement de l'air comprimé dans le circuit pneumatique correspondant à l'extrémité de la chambre concernée et la présence du tiroir devant l'orifice du conduit pneumatique correspondant entraíne une élévation de pression dans le circuit pneumatique, cette élévation de pression étant vérifiée par l'intermédiaire d'un pressostat qui délivre un signal d'autorisation de l'opération d'usinage ou de manutention suivante.When the hydraulic cylinder arrives in one or the other position, the power station automatically delivers compressed air in the pneumatic circuit corresponding to the end of the chamber concerned and the presence of the drawer in front of the opening of the pneumatic duct corresponding causes a pressure rise in the circuit pneumatic, this pressure rise being verified by means of a pressure switch that issues an authorization signal for the machining operation or next handling.

Ces détecteurs de position à tiroirs connus, qui se déplacent en fait devant un orifice délivrant de l'air sous pression, orifice qu'ils ferment par un déplacement en cisaillement, présentent cependant l'inconvénient, du fait des jeux de fonctionnement nécessaires pour le déplacement du tiroir et du fait de l'usure consécutive à des cadences de travail élevées, d'être sujets à des fuites d'air relativement importantes en fonctionnement, ce qui entraíne une consommation d'énergie importante et une limitation du nombre de vérins pouvant être reliés à une même centrale d'énergie. En outre, ces détecteurs à tiroirs posent un problème de précision de leur déplacement, du fait qu'il est absolument nécessaire que le recouvrement des orifices délivrant l'air sous pression soit effectué non seulement complètement, mais avec un dépassement minimum de la section de l'ouverture. Il en résulte que la précision de réglage du déplacement du tiroir et donc du vérin auquel est raccordé ce tiroir est relativement aléatoire.These known position sensors with drawers, which move in made in front of an orifice delivering pressurized air, orifice which they close by a shear displacement, however have the disadvantage of makes the necessary operating clearances for moving the drawer and due to wear following high working rates, to be subject relatively large air leaks during operation, which results in significant energy consumption and a limitation of number of cylinders that can be connected to the same power plant. In furthermore, these drawer detectors pose a problem of accuracy of their displacement, since it is absolutely necessary that the recovery orifices delivering the pressurized air is made not only completely, but with a minimum overshoot of the cross-section of the opening. As a result, the precision of adjustment of the movement of the drawer and therefore of the jack to which this drawer is connected is relatively random.

Par ailleurs, les fuites d'air consécutives au jeu entre le tiroir et sa chambre de guidage provoquent des bruits de fonctionnement, tels que des sifflements assez élevés, préjudiciables aux opérateurs travaillant dans l'environnement de la machine. Ces fuites entraínent également, lors du travail en ambiance humide, dû par exemple à la présence d'huile de coupe, la formation de brouillards néfastes, qui ne sont plus tolérés par les réglementations du travail en vigueur.In addition, air leaks resulting from play between the drawer and its guide chamber cause operating noises, such as fairly high hissing sounds, detrimental to operators working in machine environment. These leaks also lead to work in a humid environment, due for example to the presence of cutting oil, the formation of harmful mists, which are no longer tolerated by labor regulations in force.

La présente invention a pour but de pallier ces inconvénients en proposant un dispositif à commande de déplacement hydraulique muni de moyens de détection pneumatique des positions du vérin permettant un contrôle plus précis des positions de déplacement et un fonctionnement sans bruit, sans fuite d'air et parfaitement propre.The object of the present invention is to overcome these drawbacks by proposing a hydraulic displacement control device provided with pneumatic detection means of the cylinder positions allowing a more precise control of travel positions and smooth operation noise, without air leakage and perfectly clean.

A cet effet, les moyens de détection pneumatique des positions du vérin, qui sont sous la forme de deux circuits pneumatiques débouchant chacun par un orifice de sortie à une extrémité d'une chambre pneumatique en prolongement axial d'un vérin hydraulique parallèlement à l'axe longitudinal de ladite chambre, coopèrent chacun, dans une position du vérin hydraulique, avec un dispositif commun de fermeture étanche, par pression contrôlée, de l'orifice de sortie correspondant, relié en déplacement avec le piston du vérin hydraulique.To this end, the pneumatic position detection means of the cylinder, which are in the form of two pneumatic circuits opening out each through an outlet port at one end of a pneumatic chamber in axial extension of a hydraulic cylinder parallel to the axis longitudinal of said chamber, each cooperating in a position of hydraulic cylinder, with a common sealing device, by pressure controlled, from the corresponding outlet, connected in displacement with the piston of the hydraulic cylinder.

L'invention sera mieux comprise, grâce à la description ci-après, qui se rapporte à un mode de réalisation préféré, donné à titre d'exemple non limitatif, et expliqué avec référence aux dessins schématiques annexés, dans lesquels :

  • la figure 1 est une vue en élévation latérale et en coupe d'un dispositif à commande de déplacement hydraulique muni de moyens de détection des positions de fin de course, conforme à l'invention, et
  • la figure 2 est une vue partielle en coupe, à plus grande échelle, d'un mode de réalisation d'une partie de l'un des moyens de détection de position de fin de course.
    • The invention will be better understood from the description below, which relates to a preferred embodiment, given by way of nonlimiting example, and explained with reference to the appended schematic drawings, in which:
  • FIG. 1 is a side elevation view in section of a hydraulic displacement control device provided with means for detecting the end positions, in accordance with the invention, and
  • Figure 2 is a partial sectional view, on a larger scale, of an embodiment of part of one of the end position detection means.

    • La figure 1 des dessins annexés représente, à titre d'exemple, un dispositif à commande de déplacement hydraulique sous forme d'un vérin hydraulique 1, muni de moyens 2, 2' de détection des positions du vérin, qui sont sous la forme de deux circuits pneumatiques débouchant chacun par un orifice de sortie à une extrémité d'une chambre pneumatique 3 en prolongement axial du vérin hydraulique 1. Conformément à l'invention, les moyens 2, 2' de détection des positions du vérin débouchent dans la chambre pneumatique 3 suivant un axe parallèle à l'axe longitudinal de ladite chambre 3 et coopèrent chacun, dans une position du vérin hydraulique, avec un dispositif commun 4 de fermeture étanche, par pression contrôlée, de l'orifice de sortie correspondant, relié en déplacement avec le piston du vérin hydraulique 1.Figure 1 of the accompanying drawings shows, by way of example, a hydraulic displacement control device in the form of a jack hydraulic 1, provided with means 2, 2 ′ for detecting the positions of the jack, which are in the form of two pneumatic circuits each opening out by a outlet port at one end of a pneumatic chamber 3 in axial extension of the hydraulic cylinder 1. According to the invention, the means 2, 2 ′ for detecting the positions of the jack open into the pneumatic chamber 3 along an axis parallel to the longitudinal axis of said chamber 3 and each cooperate in a position of the jack hydraulic, with a common sealing device 4, by pressure controlled, from the corresponding outlet, connected in displacement with the piston of the hydraulic cylinder 1.

    Selon une caractéristique de l'invention, le dispositif commun 4 de fermeture étanche par pression contrôlée se présente avantageusement sous forme d'un élément muni sur deux faces opposées de moyens d'appui 5 et 6 destinés à réaliser une fermeture étanche par pression de l'orifice de sortie du circuit pneumatique 2, 2' correspondant dans chaque position du vérin.According to a characteristic of the invention, the common device 4 tight closure by controlled pressure is advantageously presented in the form of an element provided on two opposite faces with support means 5 and 6 intended to effect a sealed closure by pressure of the orifice of outlet of the pneumatic circuit 2, 2 ′ corresponding in each position of the cylinder.

    Selon un mode de réalisation préférentiel de l'invention, représenté aux figures 1 et 2 des dessins annexés, l'un, 5, des moyens d'appui formant le dispositif commun de fermeture étanche 4, coopérant avec le moyen 2, se présente sous forme d'une pièce annulaire serrée sur l'extrémité d'une tige 7 solidaire du piston du vérin hydraulique 1 et présentant une capacité de déformation élastique, alors que l'autre moyen d'appui 6 est constitué par un poussoir monté dans la tige 7 du piston du vérin hydraulique 1 avec possibilité de déplacement contre un ressort de rappel 8 et fermant, par une partie 6' en saillie hors de ladite tige 7, dans la position correspondante du piston du vérin hydraulique 1, l'orifice de sortie du moyen 2' correspondant. Ainsi, dans la position extrême du piston du vérin hydraulique 1, représentée à la figure 1 du dessin annexé, le moyen d'appui 5 est pressé sur l'orifice de sortie du circuit pneumatique formant le moyen de détection 2 et ferme ce circuit d'une manière parfaitement étanche, de sorte qu'une mise en pression de ce circuit peut s'effectuer très rapidement et peut être détectée par le pressostat de contrôle correspondant. Ce dernier peut alors délivrer un signal de certification de la position extrême correspondante du piston.According to a preferred embodiment of the invention, shown in Figures 1 and 2 of the accompanying drawings, one, 5, means support forming the common sealing device 4, cooperating with means 2, is in the form of an annular piece clamped on the end of a rod 7 secured to the piston of the hydraulic cylinder 1 and having an elastic deformation capacity, while the other means support 6 is constituted by a pusher mounted in the rod 7 of the piston of the hydraulic cylinder 1 with possibility of displacement against a spring return 8 and closing, by a part 6 'projecting from said rod 7, in the corresponding position of the piston of the hydraulic cylinder 1, the outlet port of the corresponding 2 ′ means. Thus, in the extreme position of the piston of the hydraulic cylinder 1, shown in Figure 1 of the accompanying drawing, the means support 5 is pressed on the outlet of the pneumatic circuit forming the detection means 2 and closes this circuit perfectly waterproof, so that this circuit can be pressurized very quickly and can be detected by the corresponding control pressure switch. The latter can then issue a position certification signal corresponding end of the piston.

    Conformément à un mode de réalisation avantageux de l'invention, l'orifice du moyen de détection 2' coopérant avec la partie 6' du poussoir formant le moyen d'appui 6 peut se présenter, comme le montrent les figures 1 et 2 des dessins annexés, sous forme d'un clapet anti-retour muni d'une tige de guidage 9 sur laquelle s'appuie, en position extrême correspondante du piston du vérin hydraulique 1, la partie 6' en saillie hors de ladite tige 7 du moyen d'appui 6. Ainsi, dans cette position extrême du piston du vérin hydraulique 1, le moyen d'appui 6 est en contact avec la tige 9 du clapet anti-retour, de sorte que le corps de ce dernier obture entièrement et de manière étanche l'orifice de sortie correspondant du circuit pneumatique 2'.In accordance with an advantageous embodiment of the invention, the orifice of the detection means 2 'cooperating with the part 6' of the pusher forming the support means 6 may appear, as shown Figures 1 and 2 of the accompanying drawings, in the form of a non-return valve provided with a guide rod 9 on which rests, in the extreme position corresponding to the piston of the hydraulic cylinder 1, the part 6 'projecting out of said rod 7 of the support means 6. Thus, in this extreme position of the piston of the hydraulic cylinder 1, the support means 6 is in contact with the rod 9 of the non-return valve, so that the body of the latter closes completely and tightly the corresponding outlet of the pneumatic circuit 2 '.

    Les dispositifs à commande de déplacement hydraulique de ce type sont généralement construits de telle manière que dans l'une des positions du piston du vérin hydraulique, le détecteur de fin de course correspondant soit en position d'actionnement, l'autre détecteur de position de fin de course étant réglable de manière à pouvoir tenir compte de la course utile du piston du vérin hydraulique.Hydraulic displacement control devices of this type are usually constructed in such a way that in one of positions of the hydraulic cylinder piston, the limit switch corresponding either in actuation position, the other position detector limit switch being adjustable so that the useful stroke of the hydraulic cylinder piston.

    Ainsi, le clapet anti-retour formant l'orifice du moyen de détection 2' coopérant avec la partie 6' du poussoir formant le moyen d'appui 6 peut avantageusement être monté dans l'extrémité correspondante de la chambre pneumatique 3 de manière réglable en position. Il en résulte qu'il est possible de régler la position de la détection de la fin de course du piston du vérin hydraulique 1. En outre, par ce même réglage et compte tenu de la longueur de la partie en saillie 6' il sera possible de tenir compte de la surcourse du vérin en cas d'absence d'un obstacle normalement prévu tel qu'une pièce, de sorte que la protection du vérin et en particulier du moyen d'appui 6 et du moyen de détection 2' correspondant reste assurée.Thus, the non-return valve forming the orifice of the means of detection 2 'cooperating with part 6' of the pusher forming the means support 6 can advantageously be mounted in the corresponding end of the pneumatic chamber 3 so as to be adjustable in position. The result that it is possible to adjust the position of the limit switch detection hydraulic cylinder piston 1. Furthermore, by this same adjustment and counts given the length of the protruding part 6 'it will be possible to take into account the overtravel of the cylinder in the absence of an obstacle normally expected such as a part, so that the protection of the jack and in particular of the support means 6 and corresponding detection means 2 'remains ensured.

    Selon une caractéristique de l'invention, le ressort de rappel 8 agissant sur le moyen d'appui 6 est taré à une force supérieure à celle de décollement du clapet anti-retour sous la pression maximale disponible dans le circuit pneumatique du moyen 2'. According to a characteristic of the invention, the return spring 8 acting on the support means 6 is calibrated with a force greater than that of detachment of the non-return valve under the maximum pressure available in the pneumatic circuit of the means 2 '.

    Selon une variante de réalisation de l'invention, non représentée aux dessins annexés, le moyen d'appui 6 peut également être pourvu, sur sa partie 6' en saillie hors de la tige 7 reliée au piston du vérin hydraulique 1 d'un dispositif de fermeture étanche par pression de l'orifice de sortie du moyen de détection 2' correspondant. Ce dispositif de fermeture étanche peut, par exemple, se présenter sous forme d'une membrane ou d'une soupape s'appuyant directement sur l'orifice de sortie du moyen de détection 2' et coopérant avec cet orifice par légère déformation élastique ou par forme.According to an alternative embodiment of the invention, not shown in the accompanying drawings, the support means 6 can also be provided, on its part 6 'projecting from the rod 7 connected to the piston of the hydraulic cylinder 1 a tight closing device by pressure of the outlet orifice of the corresponding 2 'detection means. This waterproof closing device may, for example, be in the form of a membrane or a valve resting directly on the outlet of the detection means 2 'and cooperating with this orifice by slight elastic deformation or by form.

    Selon une autre variante de réalisation de l'invention non représentée aux dessins annexés, il est également possible de pourvoir l'orifice de chaque moyen de détection 2, 2' dans la chambre pneumatique 3 d'un clapet anti-retour actionné dans la position correspondante par un dispositif élastiquement déformable à précharge. Dans un tel cas, le dispositif élastiquement déformable pourrait se présenter sous forme d'une lame de ressort fixée sur une tige reliée au piston du cylindre hydraulique et s'appuyant par son extrémité libre sur la tige de guidage des clapets anti-retour.According to another alternative embodiment of the invention not shown in the accompanying drawings, it is also possible to provide the orifice of each detection means 2, 2 'in the pneumatic chamber 3 a non-return valve actuated in the corresponding position by a elastically deformable device with preload. In such a case, the elastically deformable device could be in the form of a leaf spring fixed on a rod connected to the piston of the hydraulic cylinder and supported by its free end on the guide rod of the non-return valves.

    L'invention a été décrite à propos d'un vérin de bridage. Toutefois, il est bien évident que l'invention est également applicable dans d'autres domaines mettant en oeuvre des vérins, que ce soit pour le positionnement ou encore pour le support de pièces.The invention has been described in connection with a clamping cylinder. However, it is obvious that the invention is also applicable in other areas using cylinders, whether for the positioning or for supporting parts.

    Grâce à l'invention, il est possible de réaliser des dispositifs à commande de déplacement munis de moyens de détection pneumatiques des positions de fin de course pouvant être réglés, de sorte que les fuites d'air sont évitées. Il en résulte qu'un grand nombre de tels dispositifs peuvent être contrôlés avec une centrale de commande unique et avec une faible dépense d'énergie.Thanks to the invention, it is possible to produce devices with movement control provided with pneumatic detection means end positions that can be adjusted so that leaks air are avoided. As a result, a large number of such devices can be controlled with a single control unit and with a low energy expenditure.

    Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et représenté aux dessins annexés. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments ou par substitution d'équivalents techniques, sans sortir pour autant du domaine de protection de l'invention.Of course, the invention is not limited to the mode of embodiment described and shown in the accompanying drawings. Modifications remain possible, especially from the point of view of the constitution of the various elements or by substitution of technical equivalents, without leaving for as much of the scope of protection of the invention.

    Claims (10)

    Dispositif à commande de déplacement hydraulique sous forme d'un vérin hydraulique (1), muni de moyens (2, 2') de détection des positions du vérin, qui sont sous la forme de deux circuits pneumatiques débouchant chacun par un orifice de sortie à une extrémité d'une chambre pneumatique (3) en prolongement axial du vérin hydraulique (1), caractérisé en ce que les moyens (2, 2') de détection des positions du vérin débouchent dans la chambre pneumatique (3) suivant un axe parallèle à l'axe longitudinal de ladite chambre (3) et coopèrent chacun, dans une position du vérin hydraulique, avec un dispositif commun (4) de fermeture étanche, par pression contrôlée, de l'orifice de sortie correspondant, relié en déplacement avec le piston du vérin hydraulique (1).Hydraulic displacement control device in the form of a hydraulic cylinder (1), provided with means (2, 2 ') for detecting the positions of the cylinder, which are in the form of two pneumatic circuits each opening through an outlet orifice one end of a pneumatic chamber (3) in axial extension of the hydraulic cylinder (1), characterized in that the means (2, 2 ') for detecting the positions of the cylinder open into the pneumatic chamber (3) along a parallel axis to the longitudinal axis of said chamber (3) and each cooperate, in a position of the hydraulic cylinder, with a common device (4) for sealing, by controlled pressure, the corresponding outlet orifice, connected in displacement with the hydraulic cylinder piston (1). Dispositif, suivant la revendication 1, caractérisé en ce que le dispositif commun (4) de fermeture étanche par pression contrôlée se présente sous forme d'un élément muni sur deux faces opposées de moyens d'appui (5 et 6) destinés à réaliser une fermeture étanche par pression de l'orifice de sortie du circuit pneumatique correspondant dans chaque position du vérin.Device according to claim 1, characterized in that the common device (4) for tight sealing by controlled pressure is in the form of an element provided on two opposite faces with support means (5 and 6) intended to produce a sealed closing by pressure of the outlet opening of the corresponding pneumatic circuit in each position of the jack. Dispositif, suivant la revendication 2, caractérisé en ce que l'un (5) des moyens d'appui formant le dispositif commun de fermeture étanche (4), coopérant avec le moyen de détection (2) se présente sous forme d'une pièce annulaire serrée sur l'extrémité d'une tige (7) solidaire du piston du vérin hydraulique (1) et présentant une capacité de déformation élastique, alors que l'autre moyen d'appui (6) est constitué par un poussoir monté dans la tige (7) du piston du vérin hydraulique (1) avec possibilité de déplacement contre un ressort de rappel (8) et fermant, par une partie (6') en saillie hors de ladite tige (7), dans la position correspondante du piston du vérin hydraulique (1), l'orifice de sortie du moyen de détection (2') correspondant.Device according to claim 2, characterized in that one (5) of the support means forming the common sealing device (4), cooperating with the detection means (2) is in the form of a part annular clamped on the end of a rod (7) integral with the piston of the hydraulic cylinder (1) and having an elastic deformation capacity, while the other support means (6) is constituted by a pusher mounted in the rod (7) of the hydraulic cylinder piston (1) with the possibility of displacement against a return spring (8) and closing, by a part (6 ') projecting from said rod (7), in the corresponding position of the piston of the hydraulic cylinder (1), the outlet of the corresponding detection means (2 '). Dispositif, suivant l'une quelconque des revendications 2 et 3, caractérisé en ce que l'orifice du moyen de détection (2') coopérant avec la partie (6') du poussoir formant le moyen d'appui (6) se présente sous forme d'un clapet anti-retour muni d'une tige de guidage (9) sur laquelle s'appuie, en position correspondante du piston du vérin hydraulique (1), la partie (6') en saillie hors de ladite tige (7) du moyen d'appui (6). Device according to either of Claims 2 and 3, characterized in that the orifice of the detection means (2 ') cooperating with the part (6') of the pusher forming the support means (6) is present under form of a non-return valve provided with a guide rod (9) on which the portion (6 ') projecting out of said rod (7) rests in the corresponding position of the piston of the hydraulic cylinder (1) ) of the support means (6). Dispositif, suivant la revendication 4, caractérisé en ce que le clapet anti-retour formant l'orifice du moyen de détection (2') coopérant avec la partie (6') du poussoir formant le moyen d'appui (6) est monté dans l'extrémité correspondante de la chambre pneumatique (3) de manière réglable en position.Device according to claim 4, characterized in that the non-return valve forming the orifice of the detection means (2 ') cooperating with the part (6') of the pusher forming the support means (6) is mounted in the corresponding end of the pneumatic chamber (3) so as to be adjustable in position. Dispositif, suivant l'une quelconque des revendications 3 et 4, caractérisé en ce que le ressort de rappel (8) agissant sur le moyen d'appui (6) est taré à une force supérieure à celle de décollement du clapet anti-retour sous la pression maximale disponible dans le circuit pneumatique du moyen de détection (2').Device according to either of Claims 3 and 4, characterized in that the return spring (8) acting on the support means (6) is calibrated with a force greater than that of the detachment of the non-return valve under the maximum pressure available in the pneumatic circuit of the detection means (2 '). Dispositif, suivant l'une quelconque des revendications 2 et 3, caractérisé en ce que le moyen d'appui (6) est pourvu, sur sa partie (6') en saillie hors de la tige (7) reliée au piston du vérin hydraulique (1) d'un dispositif de fermeture étanche par pression de l'orifice de sortie du moyen de détection (2') correspondant.Device according to either of Claims 2 and 3, characterized in that the support means (6) is provided, on its part (6 ') projecting from the rod (7) connected to the piston of the hydraulic cylinder. (1) a device for sealing by pressure the outlet orifice of the corresponding detection means (2 '). Dispositif, suivant la revendication 7, caractérisé en ce que le dispositif de fermeture étanche se présente sous forme d'une membrane ou d'une soupape s'appuyant directement sur l'orifice de sortie du moyen de détection (2') et coopérant avec cet orifice par légère déformation élastique ou par forme.Device according to claim 7, characterized in that the leaktight closing device is in the form of a membrane or of a valve pressing directly on the outlet orifice of the detection means (2 ') and cooperating with this orifice by slight elastic deformation or by shape. Dispositif, suivant la revendication 1, caractérisé en ce que l'orifice de chaque moyen de détection (2, 2') dans la chambre pneumatique (3) est pourvu d'un clapet anti-retour actionné dans la position correspondante par un dispositif élastiquement déformable à précharge.Device according to claim 1, characterized in that the orifice of each detection means (2, 2 ') in the pneumatic chamber (3) is provided with a non-return valve actuated in the corresponding position by an elastically device deformable with preload. Dispositif, suivant la revendication 9, caractérisé en ce que le dispositif élastiquement déformable se présente sous forme d'une lame de ressort fixée sur une tige reliée au piston du cylindre hydraulique et s'appuyant par son extrémité libre sur la tige de guidage des clapets anti-retour.Device according to claim 9, characterized in that the elastically deformable device is in the form of a spring leaf fixed on a rod connected to the piston of the hydraulic cylinder and bearing by its free end on the guide rod of the valves check.
    EP20040360025 2003-03-24 2004-03-09 Control device for hydraulic displacement provided with pneumatic means to detect the position without leakage Expired - Fee Related EP1462662B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0303561 2003-03-24
    FR0303561A FR2852873B1 (en) 2003-03-24 2003-03-24 DEVICE WITH HYDRAULIC DISPLACEMENT CONTROL PROVIDED WITH PNEUMATIC DETECTION MEANS WITH NO LEAKAGE OF THE POSITIONS

    Publications (2)

    Publication Number Publication Date
    EP1462662A1 true EP1462662A1 (en) 2004-09-29
    EP1462662B1 EP1462662B1 (en) 2008-02-27

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    Application Number Title Priority Date Filing Date
    EP20040360025 Expired - Fee Related EP1462662B1 (en) 2003-03-24 2004-03-09 Control device for hydraulic displacement provided with pneumatic means to detect the position without leakage

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    EP (1) EP1462662B1 (en)
    DE (1) DE602004012011T2 (en)
    FR (1) FR2852873B1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN111351523A (en) * 2019-12-04 2020-06-30 福建工程学院 Hydraulic cylinder displacement and speed soft measurement method of single-pump open system

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    Publication number Priority date Publication date Assignee Title
    US3555966A (en) * 1969-12-08 1971-01-19 Mead Specialties Co Inc Air cylinder with pilot valve in head
    DE2313215A1 (en) * 1972-12-21 1974-06-27 Orsta Hydraulik Veb K DEVICE FOR GETTING INFORMATION ON WORK CYLINDERS
    FR2288895A1 (en) * 1974-08-30 1976-05-21 Geoffray Jean Pierre Machine tool actuator with integral scanner - working stroke end adjustment may be externally controlled
    FR2289781A1 (en) * 1974-10-29 1976-05-28 Jouvenel & Cordier Device to control ram at ends of strokes - has body screwing into inlet with feeler actuated by piston damper ring
    DE19616441C1 (en) * 1996-04-25 1997-06-26 Tuenkers Maschinenbau Gmbh Toggle joint clamping device for vehicle bodywork, with grip head

    Patent Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3555966A (en) * 1969-12-08 1971-01-19 Mead Specialties Co Inc Air cylinder with pilot valve in head
    DE2313215A1 (en) * 1972-12-21 1974-06-27 Orsta Hydraulik Veb K DEVICE FOR GETTING INFORMATION ON WORK CYLINDERS
    FR2288895A1 (en) * 1974-08-30 1976-05-21 Geoffray Jean Pierre Machine tool actuator with integral scanner - working stroke end adjustment may be externally controlled
    FR2289781A1 (en) * 1974-10-29 1976-05-28 Jouvenel & Cordier Device to control ram at ends of strokes - has body screwing into inlet with feeler actuated by piston damper ring
    DE19616441C1 (en) * 1996-04-25 1997-06-26 Tuenkers Maschinenbau Gmbh Toggle joint clamping device for vehicle bodywork, with grip head

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN111351523A (en) * 2019-12-04 2020-06-30 福建工程学院 Hydraulic cylinder displacement and speed soft measurement method of single-pump open system
    CN111351523B (en) * 2019-12-04 2022-06-28 福建工程学院 Hydraulic cylinder displacement and speed soft measurement method of single-pump open system

    Also Published As

    Publication number Publication date
    FR2852873B1 (en) 2005-05-27
    DE602004012011D1 (en) 2008-04-10
    EP1462662B1 (en) 2008-02-27
    FR2852873A1 (en) 2004-10-01
    DE602004012011T2 (en) 2009-06-25

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