EP1462662B1 - 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
EP1462662B1
EP1462662B1 EP20040360025 EP04360025A EP1462662B1 EP 1462662 B1 EP1462662 B1 EP 1462662B1 EP 20040360025 EP20040360025 EP 20040360025 EP 04360025 A EP04360025 A EP 04360025A EP 1462662 B1 EP1462662 B1 EP 1462662B1
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EP
European Patent Office
Prior art keywords
hydraulic cylinder
piston
rod
detection means
orifice
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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.)
Expired - Fee Related
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EP20040360025
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German (de)
French (fr)
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EP1462662A1 (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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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 fastening and positioning of parts on machine tools, in particular working at high speed, in particular the clamping and the abutment of parts by means of hydraulic displacement control devices provided with means of pneumatic position detection and relates to such a device provided with displacement position control means.
  • the means for clamping and abutting parts, as well as other abutment devices, for example anti-vibration devices, are generally in the form of hydraulic cylinders with double effect, linear displacement and / or rotary and allow effective clamping or precise positioning of workpieces or others.
  • position detectors which often consist of pneumatic assemblies cooperating alternately in the two positions of the cylinders with a closing means circuits these sets.
  • the pneumatic assemblies are in the form of independent pneumatic circuits fed alternately by a power plant and each opening at one end of a chamber extending in extension of the hydraulic cylinder.
  • This hydraulic jack is connected in said chamber to a slide movable in common with said hydraulic cylinder, so that said slide is positioned in each position of the cylinder in front of a corresponding orifice of one of the pneumatic circuits.
  • the power plant automatically delivers compressed air into the pneumatic circuit corresponding to the end of the chamber concerned and the presence of the drawer in front of the orifice of the corresponding pneumatic duct causes a rise in pressure in the pneumatic circuit, this pressure elevation being verified by means of a pressure switch which delivers an authorization signal for the next machining or handling operation.
  • the object of the present invention is to overcome these drawbacks by proposing a hydraulic displacement control device provided with pneumatic means for detecting the positions of the jack enabling more precise control of the displacement positions and operation without noise, without air leakage and perfectly clean.
  • the pneumatic detection means of the cylinder positions which are in the form of two pneumatic circuits each opening by an outlet orifice at one end of a pneumatic chamber in axial extension of a hydraulic cylinder parallel to the longitudinal axis of said chamber, each cooperate, in a position of the hydraulic cylinder, with a common device for sealing, by controlled pressure, the corresponding outlet orifice, connected in displacement with the piston of the hydraulic cylinder.
  • FIG. 1 of the accompanying drawings represents, by way of example, a 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 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 cylinder open into the pneumatic chamber 3 following a axis parallel 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 piston of the hydraulic cylinder 1.
  • the common device 4 for sealing by controlled pressure is advantageously in the form of a member provided on two opposite faces with support means 5 and 6 intended to provide a pressure-tight seal against pressure.
  • output port of the pneumatic circuit 2, 2 ' corresponding in each position of the cylinder.
  • one, 5, support means forming the common sealing device 4, cooperating with the means 2, is in the form of a tight annular piece on the end of a rod 7 secured to the piston of the hydraulic cylinder 1 and having a resilient deformation capacity
  • the other support means 6 is constituted by a pusher mounted in the rod 7 of the piston of the hydraulic cylinder 1 with the possibility of displacement against a return spring 8 and closing, by a portion 6 'projecting from said rod 7, in the corresponding position of the piston of the hydraulic cylinder 1, the outlet of the corresponding means 2'.
  • the support means 5 is pressed on the outlet orifice of the pneumatic circuit forming the detection means 2 and closes this circuit in a perfectly sealed manner, so that pressurization of this circuit can be carried out very quickly and can be detected by the corresponding control pressure switch. The latter can then deliver a certification signal of the corresponding extreme position of the piston.
  • the orifice of the detection means 2 'cooperating with the portion 6' of the pusher forming the support means 6 may be, as shown by the 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 corresponding extreme position of the piston of the hydraulic cylinder 1, the portion 6 'projecting from said rod 7 of the 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 of sealing the corresponding outlet port of the pneumatic circuit 2 '.
  • Hydraulic displacement control devices of this type are generally constructed such that in one of the positions of the piston of the hydraulic cylinder, the corresponding limit switch is in the actuating position, the other position sensor of end of stroke being adjustable so as to take into account the useful stroke of the piston of the hydraulic cylinder.
  • the check valve forming the orifice of the detection means 2 'cooperating with the part 6' of the pusher forming the support means 6 can advantageously be mounted in the corresponding end of the pneumatic chamber 3 in a manner that can be adjusted position.
  • by this same adjustment and taking into account the length of the projecting portion 6 'it will be possible to take into account the overtravel of the cylinder in the absence of a normally foreseen obstacle such as a part, so that the protection of the cylinder and in particular the support means 6 and the corresponding detection means 2 'remains assured.
  • the return spring 8 acting on the support means 6 is calibrated at 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 may also be provided, on its portion 6 'projecting from the rod 7 connected to the piston of the hydraulic cylinder 1 of a device sealing by pressure of the outlet of the corresponding detection means 2 '.
  • This sealing device may, for example, be in the form of a membrane or a valve bearing 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 of a non-return valve actuated in the position corresponding by an elastically deformable device preload 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)

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 fastening and positioning of parts on machine tools, in particular working at high speed, in particular the clamping and the abutment of parts by means of hydraulic displacement control devices provided with means of pneumatic position detection and relates to such a device provided with displacement position control means.

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 for clamping and abutting parts, as well as other abutment devices, for example anti-vibration devices, are generally in the form of hydraulic cylinders with double effect, linear displacement and / or rotary and allow effective 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 positioning or the certainty of effective clamping clamping, these devices are provided with position detectors which often consist of pneumatic assemblies cooperating alternately in the two positions of the cylinders with a closing means circuits these sets.

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 independent pneumatic circuits fed alternately by a power plant and each opening at one end of a chamber extending in extension of the hydraulic cylinder. This hydraulic jack is connected in said chamber to a slide movable in common with said hydraulic cylinder, so that said slide 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 entraîne 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 plant automatically delivers compressed air into the pneumatic circuit corresponding to the end of the chamber concerned and the presence of the drawer in front of the orifice of the corresponding pneumatic duct causes a rise in pressure in the pneumatic circuit, this pressure elevation being verified by means of a pressure switch which delivers an authorization signal for the next machining or handling operation.

Ces détecteurs de position à tiroirs connus, par exemple du document FR-A-2 288 895 , 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 entraîne 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 position detectors with known drawers, for example from the document FR-A-2,288,895 , which actually move in front of an orifice delivering air under pressure, which orifice they close by shear displacement, however, have the disadvantage of makes operating clearances necessary for the displacement of the drawer and due to the consequent wear at high work rates, to be subject to relatively large air leaks in operation, resulting in a significant energy consumption and a limitation of the number of cylinders that can be connected to the same power plant. In addition, these detectors with drawers pose a problem of precision of their displacement, because it is absolutely necessary that the covering of the orifices delivering the air under pressure be carried out not only completely, but with a minimum overshoot of the section of the opening. As a result, the accuracy of adjustment of the displacement of the drawer and thus of the cylinder 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 entraînent 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.Furthermore, the air leaks due to play between the drawer and its guide chamber cause operating noise, such as whistles quite high, detrimental to operators working in the environment of the machine. These leaks also cause, during work in humid environment, due for example to the presence of cutting oil, the formation of harmful fogs, which are no longer tolerated by the 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 means for detecting the positions of the jack enabling more precise control of the displacement positions and operation without 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.For this purpose, the pneumatic detection means of the cylinder positions, which are in the form of two pneumatic circuits each opening by an outlet orifice at one end of a pneumatic chamber in axial extension of a hydraulic cylinder parallel to the longitudinal axis of said chamber, each cooperate, in a position of the hydraulic cylinder, with a common device for sealing, by controlled pressure, the corresponding outlet orifice, 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, thanks to the following description, which refers to a preferred embodiment, given by way of non-limiting example, and explained with reference to the attached schematic drawings, in which:
  • the figure 1 is a side elevation view in section of a hydraulic displacement control device provided with end position detection means according to the invention, and
  • the figure 2 is a partial sectional view, on a larger scale, of an embodiment of a portion 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.The figure 1 of the accompanying drawings represents, by way of example, a 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 at one end of a pneumatic chamber 3 in axial extension of the hydraulic cylinder 1. In accordance with the invention, the means 2, 2 'for detecting the positions of the cylinder open into the pneumatic chamber 3 following a axis parallel 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 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 one characteristic of the invention, the common device 4 for sealing by controlled pressure is advantageously in the form of a member provided on two opposite faces with support means 5 and 6 intended to provide a pressure-tight seal against pressure. output port 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, represented in Figures 1 and 2 of the accompanying drawings, one, 5, support means forming the common sealing device 4, cooperating with the means 2, is in the form of a tight annular piece on the end of a rod 7 secured to the piston of the hydraulic cylinder 1 and having a resilient deformation capacity, while the other support means 6 is constituted by a pusher mounted in the rod 7 of the piston of the hydraulic cylinder 1 with the possibility of displacement against a return spring 8 and closing, by a portion 6 'projecting from said rod 7, in the corresponding position of the piston of the hydraulic cylinder 1, the outlet of the corresponding means 2'. Thus, in the extreme position of the piston of the hydraulic cylinder 1, shown in FIG. figure 1 of the accompanying drawing, the support means 5 is pressed on the outlet orifice of the pneumatic circuit forming the detection means 2 and closes this circuit in a perfectly sealed manner, so that pressurization of this circuit can be carried out very quickly and can be detected by the corresponding control pressure switch. The latter can then deliver a certification signal of the corresponding extreme position 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'.According to an advantageous embodiment of the invention, the orifice of the detection means 2 'cooperating with the portion 6' of the pusher forming the support means 6 may be, as shown by the 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 corresponding extreme position of the piston of the hydraulic cylinder 1, the portion 6 'projecting from said rod 7 of the 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 of sealing the corresponding outlet port 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 generally constructed such that in one of the positions of the piston of the hydraulic cylinder, the corresponding limit switch is in the actuating position, the other position sensor of end of stroke being adjustable so as to take into account the useful stroke of the piston of the hydraulic cylinder.

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 check valve forming the orifice of the detection means 2 'cooperating with the part 6' of the pusher forming the support means 6 can advantageously be mounted in the corresponding end of the pneumatic chamber 3 in a manner that can be adjusted position. As a result, it is possible to adjust the position of the detection of the end of stroke of the piston of the hydraulic cylinder 1. In addition, by this same adjustment and taking into account the length of the projecting portion 6 'it will be possible to take into account the overtravel of the cylinder in the absence of a normally foreseen obstacle such as a part, so that the protection of the cylinder and in particular the support means 6 and the corresponding detection means 2 'remains assured.

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 one characteristic of the invention, the return spring 8 acting on the support means 6 is calibrated at 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 may also be provided, on its portion 6 'projecting from the rod 7 connected to the piston of the hydraulic cylinder 1 of a device sealing by pressure of the outlet of the corresponding detection means 2 '. This sealing device may, for example, be in the form of a membrane or a valve bearing 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 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 of a non-return valve actuated in the position corresponding by an elastically deformable device 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 with reference to a clamping cylinder. However, it is obvious that the invention is also applicable in other areas using cylinders, whether for positioning or for the support of 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 provide displacement control devices provided with pneumatic detection means with adjustable end positions so that air leakage is 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 embodiment described and shown in the accompanying drawings. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (10)

  1. Control device for hydraulic displacement in the form of a hydraulic cylinder (1), provided with means (2, 2') for detecting the position of the cylinder, which means are in the form of two pneumatic circuits each opening into an outlet orifice at one end of a pneumatic chamber (3) in the axial extension of the hydraulic cylinder (1), characterized in that the means (2, 2') for detecting the position of the cylinder open into the pneumatic chamber (3) along an axis parallel to the longitudinal axis of said chamber (3) and, in one position of the hydraulic cylinder, each cooperate with a common device (4) for sealing, by controlled pressure, the corresponding outlet orifice, connected in terms of displacement to the piston of the hydraulic cylinder (1).
  2. Device according to Claim 1, characterized in that the common device (4) for sealing by controlled pressure is in the form of an element provided on two opposite faces with bearing means (5 and 6) for sealing by pressure the outlet orifice of the corresponding pneumatic circuit in each position of the cylinder.
  3. Device according to Claim 2, characterized in that one (5) of the bearing means forming the common device (4) for sealing and cooperating with the detection means (2) is in the form of an annular part clamped on the end of a rod (7) integral with the piston of the hydraulic cylinder (1) and able to be elastically deformed, while the other bearing means (6) consists of a pusher mounted in the rod (7) of the piston of the hydraulic cylinder (1), which can be displaced against a return spring (8), and, in the corresponding position of the piston of the hydraulic cylinder (1), seals off the outlet orifice of the corresponding detection means (2') by means of a portion (6') projecting from said rod (7).
  4. Device according to either of Claims 2 and 3, characterized in that the orifice of the detection means (2') cooperating with the portion (6') of the pusher forming the bearing means (6) is in the form of a non-return valve provided with a guiding rod (9) against which, in the corresponding position of the piston of the hydraulic cylinder (1), the portion (6') projecting from said rod (7) of the bearing means (6) bears.
  5. Device according to Claim 4, characterized in that the non-return valve forming the orifice of the detection means (2') cooperating with the portion (6') of the pusher forming the bearing means (6) is mounted at the corresponding end of the pneumatic chamber (3) such that its position can be adjusted.
  6. Device according to either of Claims 3 and 4, characterized in that the return spring (8) acting on the bearing means (6) is set to a force greater than the force required to release the non-return valve under the greatest pressure available in the pneumatic circuit of the detection means (2').
  7. Device according to either of Claims 2 and 3, characterized in that the bearing means (6) is provided, on its portion (6') projecting from the rod (7) connected to the piston of the hydraulic cylinder (1), with a device for sealing by pressure the outlet orifice of the corresponding detection means (2').
  8. Device according to Claim 7, characterized in that the device for sealing is in the form of a diaphragm or valve bearing directly on the outlet orifice of the detection means (2') and cooperating with this orifice by slight elastic deformation or by virtue of its shape.
  9. 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 a preloaded elastically deformable device.
  10. Device according to Claim 9, characterized in that the elastically deformable device is in the form of a spring leaf fastened to a rod connected to the piston of the hydraulic cylinder and bearing with its free end on the guiding rod of the non-return valves.
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)

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

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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)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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* 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
DD101469A1 (en) * 1972-12-21 1973-11-12
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

Also Published As

Publication number Publication date
DE602004012011D1 (en) 2008-04-10
FR2852873B1 (en) 2005-05-27
EP1462662A1 (en) 2004-09-29
FR2852873A1 (en) 2004-10-01
DE602004012011T2 (en) 2009-06-25

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