WO2010146418A2 - Rotary hydropneumatic actuator having a pneumatic interface, and application of such an actuator to machine tools - Google Patents
Rotary hydropneumatic actuator having a pneumatic interface, and application of such an actuator to machine tools Download PDFInfo
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- WO2010146418A2 WO2010146418A2 PCT/IB2009/052622 IB2009052622W WO2010146418A2 WO 2010146418 A2 WO2010146418 A2 WO 2010146418A2 IB 2009052622 W IB2009052622 W IB 2009052622W WO 2010146418 A2 WO2010146418 A2 WO 2010146418A2
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- 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
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
Definitions
- the invention relates to a rotary hydropneumatic actuator, applicable to actuations where it is necessary to combine a linear movement with a rotational movement.
- the actuator of the invention can be applied in any case of such combined movements, in particular a remarkable application where its advantages are highlighted is the actuation of a pliers or machine tool holding plate. , an automatic lap for example.
- the device traditionally used to exert a linear axial movement requiring a considerable force, while "traversing" a rotational movement consists of the use of a rotating hydraulic cylinder with the object or the part to be controlled linearly, the piston of this cylinder being moved by a hydraulic fluid whose circuits have an interface, HYDRAULIC LEVEL, between the rotating part and the fixed part, where are located in particular the power connections.
- This interface is constituted, in the prior art, by rotary joints supposed to ensure the sealing of the hydraulic fluid. There is, to our knowledge, no high speed rotary joint to ensure this seal at the high pressures commonly used in hydraulic systems. The result is that oil escapes continuously through the joints and is collected as best as possible by a drainage device. This oil leak, combined with the need to supplement the level of the fluid in the tank of the hydraulic system, represents a certain risk for the environment.
- Fig. 7 represents a typical device of the prior art.
- the usual hydraulic devices are conventionally powered by an external hydraulic pump with its accessories, valves, flexible pipes, oil tank, among others. All of these components are relatively bulky and are usually housed in a separate cabinet.
- the object of the present invention is to develop a simple and compact concept actuator does not have the disadvantages mentioned, and can be manufactured at a competitive cost compared to existing actuators.
- the solution proposed by the present invention to solve the problem posed is contained in the characteristic of the independent claim no. 1 and its alternative embodiment in the dependent claim 2.
- It essentially consists of using a main hydraulic cylinder whose function is to generate an axial movement, the cylinder driven by the rotational movement imposed by the machine on which the actuator is mounted , and controlled by a hydropneumatic pressure amplification converter, arranged around and rotating with the same main hydraulic cylinder, the converter comprising a ring-shaped pneumatic piston controlled by a fixed external pneumatic directional valve supplying the converter through a stationary distributor comprising rotary joints constituting a PNEUMATIC LEVEL interface between this distributor and the rotating part.
- the seal in the hydraulic cylinder is obtained by conventional seals, the latter having to work during axial movement at relatively low speeds of movement, compared to the high tangential speeds of the rotational movement.
- the device of the invention also has the advantage of substituting the external and bulky hydraulic system used by the prior art, by the actuator-converter assembly with pressure amplification cited above, the generation of hydraulic pressure being made at inside this set.
- the compact self-contained assembly thus formed can be easily attached to an existing machine tool without requiring more space immediately around the machine, compared to the devices of the prior art.
- Figures 5 and 6 are used to dimensionally compare a typical device of the prior art with the device of the invention.
- the external directional pneumatic valve of conventional type, can be powered by a network of compressed air current at 6 or 7 bar pressure.
- Another object of the present invention is to expose a typical application of the device described to machine tools, in particular CNC lathes.
- the solution to achieve this goal is contained in the feature of claim no. 3.
- Fig. 1 represents a simplified diagram making it easier to understand the operating principle of a hydropneumatic pressure amplification actuator according to the invention.
- Fig. 2 shows a sectional view of the invention, comprising the main hydraulic cylinder, the pneumatic piston hydropneumatic converter equipped with hydraulic cylinders pressure amplifiers, and the interface with pneumatic rotary joints.
- Fig. 3 shows the detail of the pneumatic internal retention valve shown in the locked state corresponding to the absence of control pressure.
- Fig. 4 shows the detail of the pneumatic internal retention valve shown in the active state where the air passage in the pipes is released.
- Fig. Figure 5 shows a scaled dimensional comparison between a typical prior art device and the device of the present invention.
- Fig. 6 makes it possible to compare the typical complete hydraulic system of the prior art with the complete assembly according to the invention making it possible to obtain the same final result.
- Fig. 7 represents a hydraulic actuator typical of the prior art.
- the actuator according to the invention (FIG 2) comprises a distributor 12 supplied with air by a pneumatic directional valve 16, these two components 12 and 16 being fixed, all the other components of the actuator rotating integrally with a machine spindle tool, a CNC lathe for example.
- the actuator of the invention may, however, work equally well at standstill, also for static applications without rotational movement, because of the total decoupling between the axial movement produced by the main hydraulic cylinder 7, 10 and the movement of rotation.
- the pneumatic directional valve 16 makes it possible to direct the air under pressure applied to the connection 13 to one or the other of the pneumatic chambers 8 or 9 in the direction desired for the linear movement of the main hydraulic piston 6.
- This directional valve is conventional and of an absolutely common type, for example two solenoids and three positions, the central position (no solenoid excited) keeping all its channels closed, constituting a safety lock position during the machining of the workpiece.
- a retention valve 11 pressed into the hydropneumatic converter blocks by the action of a spring 17 any inlet or air outlet to or from the pneumatic piston in the event of a pressure drop on the connection 13, which is connected to the air supply of the directional valve 16.
- the directional valve 16 allows the compressed air to enter through the connection 14 and fill the front air chamber 8, which causes the displacement of the pneumatic piston 3 from the front to the rear, this is ie from left to right in fig. 2.
- This piston 3 of annular shape comprises a set of hydraulic cylinders pressure amplifiers 1, 5. The pressure amplification results from the ratio between the section of the pneumatic piston 3 and the section of the amplifying pistons 2 and 4.
- the hydraulic piston amplifier 4 flushes the oil from the rear hydraulic chamber 5 to the rear main chamber 10, causing the displacement of the main hydraulic piston 6 from the rear to the front with the force required to achieve the desired linear actuation.
- the directional valve blocks the air in the two chambers of the pneumatic cylinder 3, which also holds the main piston 6 in locked position.
- the solenoid V2 is activated, the directional valve 16 allows the compressed air to enter through the connection 15 and fill the rear air chamber 9, causing the pneumatic piston 3 to return from the rear to the front.
- the hydraulic piston amplifier 2 expels the oil from the hydraulic chamber before 1 to the main chamber before 7, which causes the displacement of the main hydraulic piston 6 from front to rear with the force required to achieve the desired linear actuation.
- the main hydraulic piston 6 of tubular general shape during its axial linear displacement, slides coaxially inside the main hydraulic cylinder and can rotate integrally with it, and the piston being longer than the cylinder, opens outwards for performing the required work, for example when the front face of the actuator is integrally mounted on a machine tool spindle, the main hydraulic piston 6 can control by its axial movement the clamping and loosening of the fastener of the workpiece to machining, especially via the tube or concentric axis usually integrated in the spindle of the lathe.
- control circuit of the directional valve 16 can easily be adapted to the desired direction for this linear movement, which depends on the type of fastener of the workpiece; for example, the control circuit may be configured so that the loosening of the workpiece corresponds to the advance movement of the main hydraulic piston 6, but it could be configured to obtain the opposite function.
- the main hydraulic cylinder extends rearwardly within the dispenser 12 and is rotatable therein, which also serves as a support attached to the machine frame, being provided with ball bearing bearings, and interface pneumatic tire having rotary joints.
- the oil remains confined in the internal circuit of the hydropneumatic converter, and the sealing of this circuit is provided by conventional joints, which also avoids any mixing or emulsion formation with the air of the pneumatic circuit.
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Abstract
Description
ACTIONNEUR HYDROPNEUMATIQUE ROTATIF A INTERFACE PNEUMATIQUE ET APPLICATION D'UN TEL ACTIONNEUR AUX M ACHINES -OUTILS. ROTARY HYDROPNEUMATIC ACTUATOR WITH PNEUMATIC INTERFACE AND APPLICATION OF SUCH ACTUATOR TO M ACHINE TOOLS.
L' invention concerne un actionneur hydropneumatique rotatif, applicable aux actionnements où il est nécessaire de combiner un mouvement linéaire avec un mouvement de rotation. L' actionneur de l' invention peut être appliqué à tous les cas de tels mouvements combinés, en particulier une application remarquable où ses avantages sont mis en évidence est constituée par l'actionnement d' une pince ou plaque porte-pièce de machine-outil, un tour automatique par exemple.The invention relates to a rotary hydropneumatic actuator, applicable to actuations where it is necessary to combine a linear movement with a rotational movement. The actuator of the invention can be applied in any case of such combined movements, in particular a remarkable application where its advantages are highlighted is the actuation of a pliers or machine tool holding plate. , an automatic lap for example.
Le dispositif traditionnellement utilisé pour exercer un mouvement linéaire axial exigeant une force considérable, tout en « traversant » un mouvement de rotation, consiste en l' utilisation d' un cylindre hydraulique tournant avec l'objet ou la pièce à commander linéairement, le piston de ce cylindre étant mû par un fluide hydraulique dont les circuits comportent une interface, AU NIVEAU HYDRAULIQUE, entre la partie en rotation et la partie fixe, où se situent notamment les connexions d'alimentation. Cette interface est constituée, dans l' art antérieur, par des joints rotatifs censés assurer l' étanchéité du fluide hydraulique. Il n' existe pas, à notre connaissance, de joint rotatif à haute vitesse permettant d' assurer cette étanchéité aux pressions élevées couramment utilisées dans les systèmes hydrauliques. Le résultat est que de l' huile s' échappe continuellement par les joints et est recueillie tant bien que mal par un dispositif de drainage. Cette fuite d' huile, associée à la nécessité de compléter le niveau du fluide dans le réservoir du système hydraulique, représente un certain risque pour l' environnement. La fig. 7 représente un dispositif typique de l'art antérieur.The device traditionally used to exert a linear axial movement requiring a considerable force, while "traversing" a rotational movement, consists of the use of a rotating hydraulic cylinder with the object or the part to be controlled linearly, the piston of this cylinder being moved by a hydraulic fluid whose circuits have an interface, HYDRAULIC LEVEL, between the rotating part and the fixed part, where are located in particular the power connections. This interface is constituted, in the prior art, by rotary joints supposed to ensure the sealing of the hydraulic fluid. There is, to our knowledge, no high speed rotary joint to ensure this seal at the high pressures commonly used in hydraulic systems. The result is that oil escapes continuously through the joints and is collected as best as possible by a drainage device. This oil leak, combined with the need to supplement the level of the fluid in the tank of the hydraulic system, represents a certain risk for the environment. Fig. 7 represents a typical device of the prior art.
D' autre part, les dispositifs hydrauliques habituels sont conventionnellement alimentés par une pompe hydraulique externe avec ses accessoires, vannes, tuyauteries flexibles, réservoir d' huile, entre autres. Tous ces composants sont relativement volumineux et sont habituellement logés dans un cabinet séparé.On the other hand, the usual hydraulic devices are conventionally powered by an external hydraulic pump with its accessories, valves, flexible pipes, oil tank, among others. All of these components are relatively bulky and are usually housed in a separate cabinet.
Le but de la présente invention est d'élaborer un actionneur de concept simple et compact ne présentant pas les inconvénients cités, et qui puisse être fabriqué pour un coût compétitif par rapport aux actionneurs existants. La solution proposée par la présente invention pour résoudre le problème posé est contenue dans la caractéristique de la revendication indépendante no. 1 et sa variante d'exécution dans la revendication dépendante 2. Elle consiste essentiellement à utiliser un cylindre hydraulique principal ayant pour fonction d'engendrer un mouvement axial, cylindre entraîné par le mouvement de rotation imposé par la machine sur laquelle l'actionneur est monté, et commandé par un convertisseur hydropneumatique à amplification de pression, agencé autour de ce même cylindre hydraulique principal et tournant avec celui-ci, le convertisseur comportant un piston pneumatique de forme annulaire commandé par une vanne directionnelle pneumatique externe fixe alimentant le convertisseur au travers d'un distributeur fixe comportant des joints rotatifs constituant interface AU NIVEAU PNEUMATIQUE entre ce distributeur et la partie tournante.The object of the present invention is to develop a simple and compact concept actuator does not have the disadvantages mentioned, and can be manufactured at a competitive cost compared to existing actuators. The solution proposed by the present invention to solve the problem posed is contained in the characteristic of the independent claim no. 1 and its alternative embodiment in the dependent claim 2. It essentially consists of using a main hydraulic cylinder whose function is to generate an axial movement, the cylinder driven by the rotational movement imposed by the machine on which the actuator is mounted , and controlled by a hydropneumatic pressure amplification converter, arranged around and rotating with the same main hydraulic cylinder, the converter comprising a ring-shaped pneumatic piston controlled by a fixed external pneumatic directional valve supplying the converter through a stationary distributor comprising rotary joints constituting a PNEUMATIC LEVEL interface between this distributor and the rotating part.
Avec ce dispositif, l'étanchéité dans le cylindre hydraulique est obtenue par des joints conventionnels, ceux-ci ne devant travailler lors du mouvement axial qu'à des vitesses de déplacement relativement faibles, comparées aux grandes vitesses tangentielles du mouvement de rotation.With this device, the seal in the hydraulic cylinder is obtained by conventional seals, the latter having to work during axial movement at relatively low speeds of movement, compared to the high tangential speeds of the rotational movement.
Le dispositif de l'invention présente aussi l'avantage de substituer le système hydraulique externe et encombrant utilisé par l'art antérieur, par l'ensemble actionneur-convertisseur à amplification de pression cité ci-dessus, la génération de pression hydraulique se faisant à l'intérieur même de cet ensemble. L'ensemble compact autonome ainsi constitué peut être aisément rapporté sur une machine-outil existante sans exiger davantage d'espace immédiatement autour de la machine, par comparaison avec les dispositifs de l'art antérieur. Les figures 5 et 6 permettent de comparer dimensionnellement un dispositif typique de l'art antérieur, avec le dispositif de l'invention.The device of the invention also has the advantage of substituting the external and bulky hydraulic system used by the prior art, by the actuator-converter assembly with pressure amplification cited above, the generation of hydraulic pressure being made at inside this set. The compact self-contained assembly thus formed can be easily attached to an existing machine tool without requiring more space immediately around the machine, compared to the devices of the prior art. Figures 5 and 6 are used to dimensionally compare a typical device of the prior art with the device of the invention.
D'autre part, la vanne pneumatique directionnelle externe, de type conventionnel, peut être alimentée par un réseau d'air comprimé courant à pression de 6 ou 7 bars.On the other hand, the external directional pneumatic valve, of conventional type, can be powered by a network of compressed air current at 6 or 7 bar pressure.
Un autre but de la présente invention est d'exposer une application typique du dispositif décrit aux machines-outils, en particulier aux tours à commande numérique CNC. La solution permettant d'atteindre ce but est contenue dans la caractéristique de la revendication no. 3.Another object of the present invention is to expose a typical application of the device described to machine tools, in particular CNC lathes. The solution to achieve this goal is contained in the feature of claim no. 3.
L' invention sera maintenant décrite en détail en se référant aux figures annexes.The invention will now be described in detail with reference to the accompanying figures.
La fig. 1 représente un schéma simplifié permettant de faciliter la compréhension du principe de fonctionnement d'un actionneur hydropneumatique à amplification de pression selon l' invention.Fig. 1 represents a simplified diagram making it easier to understand the operating principle of a hydropneumatic pressure amplification actuator according to the invention.
La fig. 2 représente une vue en coupe de l' invention, comportant le cylindre hydraulique principal, le convertisseur hydropneumatique à piston pneumatique équipé de cylindres hydrauliques amplificateurs de pression, et l'interface à joints tournants pneumatiques.Fig. 2 shows a sectional view of the invention, comprising the main hydraulic cylinder, the pneumatic piston hydropneumatic converter equipped with hydraulic cylinders pressure amplifiers, and the interface with pneumatic rotary joints.
La fig. 3 représente le détail de la vanne interne pneumatique de rétention représentée dans l'état verrouillé correspondant à l'absence de pression de commande.Fig. 3 shows the detail of the pneumatic internal retention valve shown in the locked state corresponding to the absence of control pressure.
La fig. 4 représente le détail de la vanne interne pneumatique de rétention représentée dans l'état actif où le passage d'air dans les conduites est libéré.Fig. 4 shows the detail of the pneumatic internal retention valve shown in the active state where the air passage in the pipes is released.
La fig. 5 montre une comparaison dimensionnelle à l'échelle entre un dispositif typique de l'art antérieur et le dispositif de la présente invention.Fig. Figure 5 shows a scaled dimensional comparison between a typical prior art device and the device of the present invention.
La fig. 6 permet de comparer le système hydraulique typique complet de l'art antérieur avec l'ensemble complet selon l'invention permettant d'obtenir le même résultat final.Fig. 6 makes it possible to compare the typical complete hydraulic system of the prior art with the complete assembly according to the invention making it possible to obtain the same final result.
La fig. 7 représente un actionneur hydraulique typique de l' art antérieur.Fig. 7 represents a hydraulic actuator typical of the prior art.
L' actionneur selon l' invention (fig. 2) comporte un distributeur 12 alimenté en air par une vanne directionnelle pneumatique 16, ces deux composants 12 et 16 étant fixes, tous les autres composants de l' actionneur tournant solidairement avec une broche de machine-outil, un tour CNC par exemple. L' actionneur de l'invention pourra cependant travailler tout aussi bien à l'arrêt, également pour des applications statiques sans mouvement de rotation, du fait du découplage total entre le mouvement axial produit par le cylindre hydraulique principal 7, 10 et le mouvement de rotation. La vanne directionnelle pneumatique 16 permet d'aiguiller l'air sous pression appliqué à la connexion 13 vers l'une ou l'autre des chambres pneumatiques 8 ou 9 suivant le sens désiré pour le mouvement linéaire du piston hydraulique principal 6. Cette vanne directionnelle est conventionnelle et d'un type absolument courant, par exemple à deux solénoïdes et trois positions, la position centrale (aucun solénoïde excité) maintenant toutes ses voies fermées, constituant une position de verrouillage de sécurité pendant l'usinage de la pièce. En outre, une vanne de rétention 11 emboutie dans le convertisseur hydropneumatique bloque par l'action d'un ressort 17 toute entrée ou sortie d'air du ou vers le piston pneumatique en cas de chute de pression sur la connexion 13, qui est connectée à l'alimentation en air de la vanne directionnelle 16. Seule cette pression d'alimentation permet de libérer la vanne 11, constituant ainsi une sécurité supplémentaire garantissant que même en cas de rupture d' une conduite d' air comprimé, le piston pneumatique ne recevra aucune pression d' aucun côté donc restera immobile, tandis que la pression hydraulique du cylindre hydraulique principal se maintiendra inchangée du côté où elle avait été engendrée par le mouvement précédent. Ceci est particulièrement avantageux pour garantir la sécurité, évitant un desserrage intempestif de la pièce lors de l' usinage, ce qui a déjà occasionnellement causé de graves accidents avec des systèmes purement hydrauliques lors de ruptures de conduites, en particulier avec le dispositif traditionnel de l' art antérieur comportant des joints hydrauliques rotatifs à perte d'huile.The actuator according to the invention (FIG 2) comprises a distributor 12 supplied with air by a pneumatic directional valve 16, these two components 12 and 16 being fixed, all the other components of the actuator rotating integrally with a machine spindle tool, a CNC lathe for example. The actuator of the invention may, however, work equally well at standstill, also for static applications without rotational movement, because of the total decoupling between the axial movement produced by the main hydraulic cylinder 7, 10 and the movement of rotation. The pneumatic directional valve 16 makes it possible to direct the air under pressure applied to the connection 13 to one or the other of the pneumatic chambers 8 or 9 in the direction desired for the linear movement of the main hydraulic piston 6. This directional valve is conventional and of an absolutely common type, for example two solenoids and three positions, the central position (no solenoid excited) keeping all its channels closed, constituting a safety lock position during the machining of the workpiece. In addition, a retention valve 11 pressed into the hydropneumatic converter blocks by the action of a spring 17 any inlet or air outlet to or from the pneumatic piston in the event of a pressure drop on the connection 13, which is connected to the air supply of the directional valve 16. Only this supply pressure makes it possible to release the valve 11, thus constituting an additional safety guaranteeing that even in the event of rupture of a compressed air line, the pneumatic piston It will receive no pressure from either side, so it will remain motionless, while the hydraulic pressure of the main hydraulic cylinder will remain unchanged from the side where it was generated by the previous movement. This is particularly advantageous for guaranteeing safety, avoiding accidental loosening of the workpiece during machining, which has already occasionally caused serious accidents with purely hydraulic systems during pipe breaks, in particular with the traditional device of the machine. prior art having rotary oil seals with oil loss.
Lorsque le solénoïde Vl est activé, la vanne directionnelle 16 laisse l'air comprimé entrer par la connexion 14 et remplir la chambre pneumatique avant 8, ce qui provoque le déplacement du piston pneumatique 3 de l'avant vers l'arrière, c'est-à-dire de la gauche vers la droite sur la fig. 2. Ce piston 3 de forme annulaire comporte un jeu de cylindres hydrauliques amplificateurs de pression 1, 5. L'amplification de pression résulte du rapport entre la section du piston pneumatique 3 et la section des pistons amplificateurs 2 et 4. En se déplaçant vers l'arrière, le piston hydraulique amplificateur 4 chasse l'huile de la chambre hydraulique arrière 5 vers la chambre principale arrière 10, ce qui provoque le déplacement du piston hydraulique principal 6 de l'arrière vers l'avant avec la force requise pour réaliser l'actionnement linéaire souhaité.When the solenoid Vl is activated, the directional valve 16 allows the compressed air to enter through the connection 14 and fill the front air chamber 8, which causes the displacement of the pneumatic piston 3 from the front to the rear, this is ie from left to right in fig. 2. This piston 3 of annular shape comprises a set of hydraulic cylinders pressure amplifiers 1, 5. The pressure amplification results from the ratio between the section of the pneumatic piston 3 and the section of the amplifying pistons 2 and 4. By moving towards the rear, the hydraulic piston amplifier 4 flushes the oil from the rear hydraulic chamber 5 to the rear main chamber 10, causing the displacement of the main hydraulic piston 6 from the rear to the front with the force required to achieve the desired linear actuation.
Lorsque le solénoïde Vl est désactivé, la vanne directionnelle bloque l'air dans les deux chambres du cylindre pneumatique 3, ce qui mantient également en position verrouillée le piston principal 6. Lorsque le solénoïde V2 est activé, la vanne directionnelle 16 laisse l'air comprimé entrer par la connexion 15 et remplir la chambre pneumatique arrière 9, ce qui provoque le retour du piston pneumatique 3 de l'arrière vers l'avant. En se déplaçant vers l'avant, le piston hydraulique amplificateur 2 chasse l'huile de la chambre hydraulique avant 1 vers la chambre principale avant 7, ce qui provoque le déplacement du piston hydraulique principal 6 de l'avant vers l'arrière avec la force requise pour réaliser l'actionnement linéaire souhaité.When the solenoid Vl is deactivated, the directional valve blocks the air in the two chambers of the pneumatic cylinder 3, which also holds the main piston 6 in locked position. When the solenoid V2 is activated, the directional valve 16 allows the compressed air to enter through the connection 15 and fill the rear air chamber 9, causing the pneumatic piston 3 to return from the rear to the front. By moving forward, the hydraulic piston amplifier 2 expels the oil from the hydraulic chamber before 1 to the main chamber before 7, which causes the displacement of the main hydraulic piston 6 from front to rear with the force required to achieve the desired linear actuation.
Le piston hydraulique principal 6 de forme générale tubulaire, lors de son déplacement linéaire axial, coulisse coaxialement à l'intérieur du cylindre hydraulique principal et peut tourner solidairement avec lui, et le piston étant plus long que le cylindre, débouche vers l'avant pour réaliser le travail exigé, par exemple lorsque la face avant de l'actionneur est montée solidairement sur une broche de machine-outil, le piston hydraulique principal 6 peut commander par son mouvement axial le serrage et le desserrage du dispositif de fixation de la pièce à usiner, en particulier par l'intermédiaire du tube ou de l'axe concentrique habituellement intégré dans la broche du tour. Le circuit de commande de la vanne directionnelle 16 peut être aisément adapté au sens désiré pour ce mouvement linéaire, qui dépend du type de dispositif de fixation de la pièce à usiner ; par exemple, le circuit de commande pourra être configuré pour que le desserrage du porte-pièce corresponde au mouvement d'avance du piston hydraulique principal 6, mais il pourrait être configuré pour obtenir la fonction inverse.The main hydraulic piston 6 of tubular general shape, during its axial linear displacement, slides coaxially inside the main hydraulic cylinder and can rotate integrally with it, and the piston being longer than the cylinder, opens outwards for performing the required work, for example when the front face of the actuator is integrally mounted on a machine tool spindle, the main hydraulic piston 6 can control by its axial movement the clamping and loosening of the fastener of the workpiece to machining, especially via the tube or concentric axis usually integrated in the spindle of the lathe. The control circuit of the directional valve 16 can easily be adapted to the desired direction for this linear movement, which depends on the type of fastener of the workpiece; for example, the control circuit may be configured so that the loosening of the workpiece corresponds to the advance movement of the main hydraulic piston 6, but it could be configured to obtain the opposite function.
Le cylindre hydraulique principal se prolonge vers l'arrière à l'intérieur du distributeur 12 et peut tourner dans celui-ci, qui sert aussi de support fixé au bâti de la machine, étant pourvu de paliers à roulements à billes, et d'interface pneumatique comportant des joints rotatifs.The main hydraulic cylinder extends rearwardly within the dispenser 12 and is rotatable therein, which also serves as a support attached to the machine frame, being provided with ball bearing bearings, and interface pneumatic tire having rotary joints.
L'huile reste confinée dans le circuit interne du convertisseur hydropneumatique, et l'étanchéité de ce circuit est assurée par des joints conventionnels, ce qui évite aussi tout mélange ou formation d'émulsion avec l'air du circuit pneumatique.The oil remains confined in the internal circuit of the hydropneumatic converter, and the sealing of this circuit is provided by conventional joints, which also avoids any mixing or emulsion formation with the air of the pneumatic circuit.
L'homme de métier, mis au courant de la solution technique objet de la présente demande de brevet, pourra aisément adapter l'actionneur hydropneumatique de l'invention aux machines les plus diverses qui nécessitent un mouvement linéaire avec application d'une force relativement élevée, exigeant une pression hydraulique pour son obtention, découplé d'un autre mouvement de rotation relativement rapide, offrant ainsi à ces machines une solution compacte, sans fuite d'huile, donc en respectant l' environnement.Those skilled in the art, aware of the technical solution that is the subject of the present patent application, can easily adapt the hydropneumatic actuator of the invention to the most diverse machines that require linear movement with the application of a relatively high force. , requiring hydraulic pressure for obtaining it, decoupled from a another relatively fast rotation movement, thus offering these machines a compact solution, without oil leakage, thus respecting the environment.
LEGENDE DES FIGURESLEGEND OF FIGURES
Fig.lfig.l
A piston pneumatiquePneumatic piston
B piston hydraulique amplificateur de pressionB hydraulic piston pressure amplifier
C chambre à huileC oil chamber
D tige du piston hydraulique principalD main hydraulic piston rod
Fig.2Fig.2
1 chambre hydraulique avant1 front hydraulic chamber
2 piston hydraulique amplificateur avant2 front hydraulic piston amplifier
3 piston pneumatique3 pneumatic piston
4 piston hydraulique amplificateur arrière4 piston hydraulic rear amplifier
5 chambre hydraulique arrière5 rear hydraulic chamber
6 piston hydraulique principal6 main hydraulic piston
7 chambre hydraulique principale avant7 main hydraulic front chamber
8 chambre pneumatique avant8 front pneumatic chamber
9 chambre pneumatique arrière9 rear pneumatic chamber
10 chambre hydraulique principale arrière10 rear main hydraulic chamber
11 piston de la vanne de rétention11 piston of the retention valve
12 distributeur à joints rotatifs12 rotary joint distributor
13 connexion d'air pour ouvrir la vanne de rétention13 air connection to open the retention valve
14 connexion d'air pour l'avance14 air connection for advance
15 connexion d'air pour le recul15 air connection for recoil
16 vanne directionnelle16 directional valve
Vl vanne solénoïde d'avance V2 vanne solénoïde de recul Fig.3Vl solenoid valve advance V2 recoil solenoid valve Fig.3
17 ressort de verrouillage17 locking spring
18 piston de la vanne de rétention18 piston of the retention valve
19 conduite d' air pour le recul19 air duct for recoil
20 conduite d' air pour l' avance20 air duct for the advance
21 conduite d' air pilote21 pilot air duct
22 chambre pneumatique de la vanne de rétention22 pneumatic chamber of the retention valve
23 orifice de passage23 through hole
Fig.4Fig.4
Sans légendeWithout legend
Fig.5Fig.5
Comparatif dimensionnelDimensional comparison
Au dessus : dispositif de l'art antérieur Au dessous : dispositif de l'inventionAbove: device of the prior art Below: device of the invention
Fig. 6Fig. 6
Dispositif de l'art antérieur avec interface hydrauliqueDevice of the prior art with hydraulic interface
1 actionneur hydraulique1 hydraulic actuator
2 vanne directionnelle hydraulique2 hydraulic directional valve
3 manomètre3 manometer
4 vanne hydraulique de sécurité4 hydraulic safety valve
5 moteur électrique5 electric motor
6 pompe hydraulique6 hydraulic pump
7 filtre de succion 8 filtre de retour7 suction filter 8 return filter
9 réservoir d'huile9 oil tank
Fis. 7.Fis. 7.
1 Partie fixe1 Fixed part
2 entrée et sortie de l'huile2 oil inlet and outlet
3 partie tournante3 rotating part
4 mouvement axial du piston hydraulique4 axial movement of the hydraulic piston
5 piston hydraulique5 hydraulic piston
6 drainage des fuites d'huile6 drainage of oil leaks
7 sortie de l'huile de refroidissement 7 output of cooling oil
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2009/052622 WO2010146418A2 (en) | 2009-06-18 | 2009-06-18 | Rotary hydropneumatic actuator having a pneumatic interface, and application of such an actuator to machine tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2009/052622 WO2010146418A2 (en) | 2009-06-18 | 2009-06-18 | Rotary hydropneumatic actuator having a pneumatic interface, and application of such an actuator to machine tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2010146418A2 true WO2010146418A2 (en) | 2010-12-23 |
| WO2010146418A3 WO2010146418A3 (en) | 2011-08-18 |
Family
ID=43356817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2009/052622 Ceased WO2010146418A2 (en) | 2009-06-18 | 2009-06-18 | Rotary hydropneumatic actuator having a pneumatic interface, and application of such an actuator to machine tools |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2010146418A2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2404492A1 (en) * | 1977-09-30 | 1979-04-27 | Lejeune Sa | Hydropneumatic ram for machine tool vice - multiplies force using two prim, pneumatic rams operating sec hydraulic ram |
| FR2661852B3 (en) * | 1990-05-11 | 1992-08-07 | Lejeune Sa | ROTARY OLEOPNEUMATIC TIGHTENING DEVICE. |
-
2009
- 2009-06-18 WO PCT/IB2009/052622 patent/WO2010146418A2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010146418A3 (en) | 2011-08-18 |
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