EP0130890A1 - Actuator having a pressure intensifier - Google Patents

Actuator having a pressure intensifier Download PDF

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Publication number
EP0130890A1
EP0130890A1 EP84401304A EP84401304A EP0130890A1 EP 0130890 A1 EP0130890 A1 EP 0130890A1 EP 84401304 A EP84401304 A EP 84401304A EP 84401304 A EP84401304 A EP 84401304A EP 0130890 A1 EP0130890 A1 EP 0130890A1
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EP
European Patent Office
Prior art keywords
piston
pneumatic
compartment
cylinder
cylinder according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP84401304A
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German (de)
French (fr)
Inventor
Robert 17 rue des Roses Lannurien
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Mecagrav Sa SA
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Mecagrav Sa SA
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Publication date
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Publication of EP0130890A1 publication Critical patent/EP0130890A1/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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

Definitions

  • the invention relates to a pneumatic cylinder of the type comprising hydraulic power multipliers, this cylinder being more particularly applicable in different presses.
  • the actuator object of the present invention proposes to remedy these various drawbacks in order to obtain the highest possible power and cadence ratios.
  • the pressure multiplier cylinder object of the invention comprises various pistons arranged in a housing 1 divided by a partition 1A into two compartments 1B and 1C.
  • the wall of the housing 1 serves as a cylinder for the two dependent extreme pistons 2 and 6, the first being integral with the push rod 20, the last being the hydraulic power piston.
  • the piston 2 placed in the compartment 1B is extended by a skirt 2a secured to the tail 3 of the power piston 6 (high hydraulic pressure).
  • This piston 4 which is the pneumatic high pressure piston can therefore move in the space between the piston 2 and the front end tail 3.
  • This comprises a central bore 3a in which the rod 5 of the piston 4 slides.
  • the hydraulic power piston 6 moves, which divides it into two zones or volumes Vl and V2. The latter communicates with the end 3b of the bore 3a.
  • the volume V1 communicates with this same bore; this passage is open or closed depending on the relative position of the rod 5 in this bore 3a.
  • the tail 3 slides with respect to the compensating piston 7 delimiting the volume V1 and kept apart from the partition la by springs such as 10.
  • the pressurized fluid inlets (normally air) Pl-P2-P3 are arranged as will be indicated below in compartment 1B.
  • P2 is located at the rear part of compartment 1B at the level of the partition 1a and then distributes the fluid in the direction of the skirt 2a and starting from the head of the tail 3, which is integral with it.
  • the high pressure seal 17 prevents the hydraulic fluid from returning to the bore 3a and therefore leaving in the volume V2.
  • the pressure developed on the rear face of the piston 6 is multiplied by the ratio existing between the section of the piston 4 and the section of the shank 5.
  • the multiplier ratio is then .
  • the device which has just been described can be controlled by distributors D1-D2, for example of the drawer type.
  • the distributor Dl is put in the position corresponding to the outlet Dlb. This feeds not only P2 but also the pressos, tat PS (Pl is then at the exhaust).
  • the device is provided with purges such as 12 and 13 allowing the trapped air to be eliminated.
  • this air passes through the skirt 2a and reaches the interior of the chamber limited by 2 and 3 and at the rear of the piston 4.
  • the pressure P2 is maintained and the pressure P3 is introduced at the level of the skirt 2a; it enters the chamber located at 2 and 3, pushes the piston 4 and the rod 5 backwards, which closes the communication between V1 and V2 by the high pressure seal 17 and drives out the oil volume from the bore central 3a in the direction of V2, causing the reaction of the hydraulic fluid on the bottom 8, which results in a high pressure on the piston 6, this being transmitted to the other elements which are integral with it, that is to say say 3 - 2a - 2 and the push rod 20.

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

Abstract

This actuator comprises, in a casing (1) divided by a partition (1a) into two compartments, the front pneumatic compartment (1b) and the rear hydraulic compartment (1c), in each of which slide pistons respectively integral in displacement (2 and 6), the rear piston (6) dividing the rear compartment (1c) into two spaces (V1 and V2), it being possible for the front compartment (1b) to be supplied by three fluid inlets (P1-P2-P3), (P1) being placed at the front of the casing so as to push back the pistons (2 and 6) by the maximum amount, (P2) placed in the vicinity of the partition (1a) ensuring the reverse movement, whilst the inlet (P3), situated between (P1) and (P2), displaces a piston (4), the stem (5) of which serves as a slide valve for a distributor opening or closing the passage between the spaces (V1 and V2). This pressure intensifier finds application, in particular, in presses. <IMAGE>

Description

L'invention se rapporte à un vérin pneumatique du type comportant des moyens hydrauliques multiplicateurs de puissance, ce vérin étant plus particulièrement applicable dans les différentes presses.The invention relates to a pneumatic cylinder of the type comprising hydraulic power multipliers, this cylinder being more particularly applicable in different presses.

L'US - A - 3 410 089 délivré à SNITGEN, enseigne un vérin de ce type général comportant trois pistons indépendants les uns des autres actionnés par un circuit pneumatique réversible grâce à deux entrées/sorties.US - A - 3 410 089 issued to SNITGEN, teaches a cylinder of this general type comprising three pistons independent of each other actuated by a reversible pneumatic circuit thanks to two inputs / outputs.

Le fait que le répartiteur des volumes hydrauliques se trouve placé à l'avant de l'appareil fait que les courses "approche" et "travail" sont de même sens ; il s'ensuit un fonctionnement plus lent rendant difficile des rendements élevés. Par ailleurs, la position antérieure de ce répartiteur fait que les pistons sont de faible diamètre et que forcément la multiplication se trouve moindre.The fact that the hydraulic volume distributor is placed at the front of the device means that the "approach" and "work" strokes are in the same direction; it follows a slower operation making high yields difficult. Furthermore, the anterior position of this distributor means that the pistons are of small diameter and that inevitably the multiplication is less.

Les mêmes inconvénients se retrouvent dans le dispositif décrit au US - A - 3 276 206 dans lequel les mouvements approche/travail sont aussi de même sens et un répartiteur également placé à la partie antérieure.The same drawbacks are found in the device described in US-A-3,276,206 in which the approach / work movements are also in the same direction and a distributor also placed at the front.

Là encore à volume égal la haute pression hydraulique est plus faible.Again at equal volume the high hydraulic pressure is lower.

On remarque en outre que le rappel en arrière s'effectue en deux temps, le rappel total ne pouvant s'effectuer qu'après ouverture des canaux de communication entre les deux volumes hydrauliques du répartiteur, d'où à nouveau,cadences possibles plus faibles.It is further noted that the backward recall takes place in two stages, the total recall can only be effected after opening of the communication channels between the two hydraulic volumes of the distributor, hence again, lower possible rates .

Le vérin objet de la présente invention se propose de remédier à ces divers inconvénients en vue d'obtenir les rapports de puissance et de cadence les plus élevés possibles.The actuator object of the present invention proposes to remedy these various drawbacks in order to obtain the highest possible power and cadence ratios.

D'autres particularités et avantages apparaîtront à la lecture de la description et des revendications qui suivent, faites en regard des dessins sur lesquels :

  • - les figures 1, 2 et 3 montrent la position des éléments respectivement dans les positions - repos - course rapide d'approche - course de travail haute pression -.
Other features and advantages will appear on reading the description and the claims which follow, made with reference to the drawings in which:
  • - Figures 1, 2 and 3 show the position of elements respectively in positions - rest - fast approach stroke - high pressure working stroke -.

Comme on le voit sur ces figures, le vérin multiplicateur de pression objet de l'invention comprend divers pistons disposés dans un boîtier 1 divisé par une cloison 1A en deux compartiments 1B et 1C.As can be seen in these figures, the pressure multiplier cylinder object of the invention comprises various pistons arranged in a housing 1 divided by a partition 1A into two compartments 1B and 1C.

La paroi du boîtier 1 sert de cylindre aux deux pistons extrêmes dépendants 2 et 6, le premier étant solidaire de la tige de poussée 20, le dernier étant le piston de puissance hydraulique.The wall of the housing 1 serves as a cylinder for the two dependent extreme pistons 2 and 6, the first being integral with the push rod 20, the last being the hydraulic power piston.

Le piston 2 placé dans le compartiment 1B se prolonge par une jupe 2a solidaire de la queue 3 du piston de puissance 6 (haute pression hydraulique).The piston 2 placed in the compartment 1B is extended by a skirt 2a secured to the tail 3 of the power piston 6 (high hydraulic pressure).

L'alésage de cette jupe 2a sert de cylindre à un piston 4 solidaire d'une queue 5. Ce piston 4 qui est le piston de haute pression pneumatique peut donc se déplacer dans l'espace compris entre le piston 2 et l'extrémité antérieure de la queue 3.The bore of this skirt 2a serves as a cylinder for a piston 4 secured to a tail 5. This piston 4 which is the pneumatic high pressure piston can therefore move in the space between the piston 2 and the front end tail 3.

Celle-ci comporte un alésage central 3a dans lequel coulisse la tige 5 du piston 4.This comprises a central bore 3a in which the rod 5 of the piston 4 slides.

Dans le compartiment 1C faisant fonction de répartiteur se déplace le piston de puissance hydraulique 6 qui le divise en deux zones ou volumes Vl et V2. Ce dernier communique avec l'extrémité 3b de l'alésage 3a.In the compartment 1C acting as a distributor, the hydraulic power piston 6 moves, which divides it into two zones or volumes Vl and V2. The latter communicates with the end 3b of the bore 3a.

Par des canaux obliques 12, le volume V1 communique avec ce même alésage ; ce passage est ouvert ou fermé selon la position relative de la tige 5 dans cet alésage 3a.By oblique channels 12, the volume V1 communicates with this same bore; this passage is open or closed depending on the relative position of the rod 5 in this bore 3a.

La queue 3 coulisse par rapport au piston compensateur 7 délimitant le volume V1 et maintenue écartée de la cloison la par des ressorts tels que 10.The tail 3 slides with respect to the compensating piston 7 delimiting the volume V1 and kept apart from the partition la by springs such as 10.

Les entrées de fluide sous pression (en principe de l'air) Pl-P2-P3 sont disposées comme il sera indiqué plus loin dans le compartiment 1B.The pressurized fluid inlets (normally air) Pl-P2-P3 are arranged as will be indicated below in compartment 1B.

Pl, placé à la partie antérieure du boîtier 1, dirige l'air sur la face avant du piston 2.Pl, placed at the front part of the housing 1, directs the air on the front face of the piston 2.

Quand on admet le fluide par Pl, P2 et P3 se trouvant à l'air libre, le piston 2 recule, entraînant la jupe 2a, le piston 4, sa tige 5, la queue 3, le piston 6, le volume V1 s'agrandit au détriment du volume V2 dont le fluide hydraulique passe en Vl par l'alésage 3b et les canaux 12.When the fluid is admitted by Pl, P2 and P3 being in the open air, the piston 2 moves back, causing the skirt 2a, the piston 4, its rod 5, the tail 3, the piston 6, the volume V1 s' enlarges at the expense of the volume V2, the hydraulic fluid of which passes through Vl through the bore 3b and the channels 12.

Le piston 4 et la tige 5 restent sous pression de Pl.The piston 4 and the rod 5 remain under pressure of Pl.

P2 se situe à la partie postérieure du compartiment 1B au niveau de la cloison la et distribue alors le fluide en direction de la jupe 2a et partant de la tête de la queue 3, qui lui est solidaire.P2 is located at the rear part of compartment 1B at the level of the partition 1a and then distributes the fluid in the direction of the skirt 2a and starting from the head of the tail 3, which is integral with it.

L'admission par P2 met Pl à l'air libre, le fluide agit sur la jupe 2a et la queue 3, ce qui fait avancer l'ensemble 2, 3 et 6, avec pour effet d'amener la tige 20 en butée ou presque avec la pièce à travailler, le piston 4 et la tige 5 restant en état.The admission by P2 puts Pl in the open air, the fluid acts on the skirt 2a and the tail 3, which advances the assembly 2, 3 and 6, with the effect of bringing the rod 20 into abutment or almost with the workpiece, the piston 4 and the rod 5 remaining in good condition.

Si l'on maintient la pression en P2, mais que l'on l'admet en P3, l'ensemble 2-2a 3-6 atteint l'avancée maximale de contact avec la pièce à travailler, mais le piston 4 et sa tige 5 reculent, ce qui ferme les canaux 12 enfermant le fluide hydraulique dans le volume V2.If the pressure is maintained at P2, but is admitted at P3, the assembly 2-2a 3-6 reaches the maximum contact advance with the workpiece, but the piston 4 and its rod 5 retreat, which closes the channels 12 enclosing the hydraulic fluid in the volume V2.

La pression en P2, outre son action sur 2-2a 3-6, agit sur le piston 7 dont le recul produit une pression sur le fluide hydraulique de Vl, le forçant à passer par les canalisations 12 en direction de 3a vers V2 pour accélérer le mouvement d'avancée dû à P2.The pressure in P2, in addition to its action on 2-2a 3-6, acts on the piston 7, the recoil of which produces pressure on the hydraulic fluid from Vl, forcing it to pass through the pipes 12 in the direction of 3a towards V2 to accelerate the forward movement due to P2.

Le joint haute pression 17 empêche le fluide hydraulique de revenir dans l'alésage 3a et partant dans le volume V2.The high pressure seal 17 prevents the hydraulic fluid from returning to the bore 3a and therefore leaving in the volume V2.

La pression développée sur la face postérieure du piston 6 est multipliée par le rapport existant entre la section du piston 4 et la section de la queue 5.The pressure developed on the rear face of the piston 6 is multiplied by the ratio existing between the section of the piston 4 and the section of the shank 5.

Si la surface du piston 4 est de 58 cm2 et celle de la queue 5 de 2,27 cm2, le rapport multiplicateur est alors de

Figure imgb0001
.If the surface of the piston 4 is 58 cm 2 and that of the tail 5 is 2.27 cm 2 , the multiplier ratio is then
Figure imgb0001
 .

Si on admet une pression de 5 bars, on obtient alors 25,5 x 5 = 127,5 bars ou Kg/cm2.If we admit a pressure of 5 bars, we then obtain 25.5 x 5 = 127.5 bars or Kg / cm 2 .

Si la surface du piston 6 est de 84,71 cm2, la pression répartie sur celui-ci sera de :

  • 84,71 cm2 x 127,5 = 10.800 Kg.
If the surface of the piston 6 is 84.71 cm 2 , the pressure distributed over it will be:
  • 84.71 cm 2 x 127.5 = 10,800 Kg.

Le pilotage du dispositif qui vient d'être décrit peut s'effectuer au moyen de distributeurs D1-D2, par exemple du type à tiroir.The device which has just been described can be controlled by distributors D1-D2, for example of the drawer type.

Pour la phase initiale pendant laquelle l'air est introduit en Pl, l'opérateur met le distributeur Dl en position telle que ledit air en sort par Dla (P2 et P3 sont alors à l'échappement).For the initial phase during which the air is introduced in P1, the operator puts the distributor Dl in position such that the said air leaves via Dla (P2 and P3 are then at the exhaust).

Pour la phase d'approche rapide pour laquelle l'air est introduit en P2, le distributeur Dl est mis dans la position correspondant à la sortie Dlb. Celle-ci alimente non seulement P2 mais aussi le pressos,tat PS (Pl est alors à l'échappement).For the rapid approach phase for which air is introduced at P2, the distributor Dl is put in the position corresponding to the outlet Dlb. This feeds not only P2 but also the pressos, tat PS (Pl is then at the exhaust).

Pour la course de travail, l'air est introduit par P3. La pression est maintenue sur P2 donc sur le pressostat PS ; c'est cette pression qui actionne le tiroir du distributeur D2 permettant la sortie de l'air par D2a qui aboutit à P3.For the working stroke, air is introduced via P3. The pressure is maintained on P2, therefore on the pressure switch PS; it is this pressure which activates the distributor valve D2 allowing the air to exit through D2a which leads to P3.

Le rappel du tiroir du distributeur Dl par relâchement différentiel de la commande initiale remet la pression sur Pl, c'est-à-dire provoque le recul maximal de 2-2a 3 et 5, étant fait observer que le recul de 4 et la tige 5 permet de débloquer simultanément le fluide hydraulique des volumes VI - V2 libérant le rappel en arrière de la tige 20 et des pièces solidaires.The recall of the distributor drawer Dl by differential release of the initial control puts the pressure back on Pl, that is to say causes the maximum recoil of 2-2a 3 and 5, being observed that the recoil of 4 and the rod 5 allows the hydraulic fluid VI - V2 to be released simultaneously, releasing the return behind the rod 20 and the integral parts.

Bien entendu, le dispositif est pourvu de purges telles que 12 et 13 permettant d'éliminer l'air enfermé.Of course, the device is provided with purges such as 12 and 13 allowing the trapped air to be eliminated.

Le fonctionnement est le suivant :

  • 1) Recul des pistons en position repos
  • L'air est admis en Pl ; il repousse vers l'arrière le piston 2 et sa jupe 2a, la tête 3 et le piston hydraulique 6.
The operation is as follows:
  • 1) Recoil of pistons in rest position
  • Air is admitted in Pl; it pushes back the piston 2 and its skirt 2a, the head 3 and the hydraulic piston 6.

Simultanément, cet air traverse la jupe 2a et accède à l'intérieur de la chambre limitée par 2 et 3 et à l'arrière du piston 4.Simultaneously, this air passes through the skirt 2a and reaches the interior of the chamber limited by 2 and 3 and at the rear of the piston 4.

Le recul de l'ensemble 2-2a 3-6 rapproche le piston 7 de la cloison la et comprime les ressorts 10.The retraction of the assembly 2-2a 3-6 brings the piston 7 closer to the partition 1a and compresses the springs 10.

2) Avance rapide2) Fast forward

La pression d'air en P1 est supprimée, ce qui vide la chambre 1B et celle comprise entre 2 et 3 ; l'air sous pression est admis en P2. L'ensemble 2-2a 3 et 6 avance, le piston 4 et la tige 5 restent à l'état, ce qui permet à la tige 5 de libérer les canaux 12, permettant au fluide hydraulique, poussé par le piston 7 agissant sous l'effet des ressorts 10, de passer de V1 en V2 par 3a et 3b, d'où compensation.The air pressure in P1 is removed, which empties the chamber 1B and that between 2 and 3; pressurized air is admitted in P2. The assembly 2-2a 3 and 6 advances, the piston 4 and the rod 5 remain in the state, which allows the rod 5 to release the channels 12, allowing the hydraulic fluid, pushed by the piston 7 acting under the 'effect of the springs 10, to pass from V1 to V2 via 3a and 3b, hence compensation.

3) Course Travail3) Work Race

La pression P2 est maintenue et la pression P3 est introduite au niveau de la jupe 2a ; il entre dans la chambre située en 2 et 3, repousse le piston 4 et la tige 5 vers l'arrière, ce qui ferme la communication entre V1 et V2 par le joint haute pression 17 et chasse le volume d'huile de l'alésage central 3a en direction de V2, provoquant la réaction du fluide hydraulique sur le fond 8, ce qui se traduit par une haute pression sur le piston 6, celle-ci étant transmise aux autres éléments qui lui sont solidaires, c'est-à-dire 3 - 2a - 2 et la tige de poussée 20.The pressure P2 is maintained and the pressure P3 is introduced at the level of the skirt 2a; it enters the chamber located at 2 and 3, pushes the piston 4 and the rod 5 backwards, which closes the communication between V1 and V2 by the high pressure seal 17 and drives out the oil volume from the bore central 3a in the direction of V2, causing the reaction of the hydraulic fluid on the bottom 8, which results in a high pressure on the piston 6, this being transmitted to the other elements which are integral with it, that is to say say 3 - 2a - 2 and the push rod 20.

Claims (7)

1.- Vérin pneumatique du type comportant des moyens hydrauliques multiplicateurs de puissance comportant des pistons coulissant dans un boîtier général (1) formant cylindre, pourvu de plusieurs entrées de fluide pneumatique et d'une cloison (la) divisant ce boitier en deux compartiments (IB et 1C), caractérisé en ce que les pistons pneumatiques sont entièrement contenus dans le compartiment antérieur (lB) alors que le piston hydraulique de puissance (6) se déplace dans le compartiment (1C) à la manière d'un répartiteur en le divisant en deux volumes variables (V1 et V2) selon sa position.1.- Pneumatic cylinder of the type comprising hydraulic power multipliers comprising pistons sliding in a general housing (1) forming a cylinder, provided with several pneumatic fluid inlets and a partition (la) dividing this housing into two compartments ( IB and 1C), characterized in that the pneumatic pistons are entirely contained in the front compartment (1B) while the hydraulic power piston (6) moves in the compartment (1C) in the manner of a distributor by dividing it in two variable volumes (V1 and V2) depending on its position. 2.- Vérin selon la revendication 1, caractérisé en ce que le compartiment pneumatique (1B) est alimenté par trois circuits aboutissant à trois entrées (Pl - P2 - P3), Pl étant près de l'extrémité antérieure du boitier (1), P2 se situant près de la cloison (la) et P3 entre Pl et P2.2. A cylinder according to claim 1, characterized in that the pneumatic compartment (1B) is supplied by three circuits leading to three inputs (Pl - P2 - P3), Pl being near the front end of the housing (1), P2 being located near the partition (la) and P3 between Pl and P2. 3.- Vérin pneumatique selon la revendication 1, caractérisé en ce que le compartiment antérieur (1B) sert de cylindre au piston de course d'avance rapide (2) solidaire de la tige de pression (20), le dit piston (2) se poursuit en direction de l'arrière par une jupe (2a) solidaire de la queue (3) du piston de puissance (6), la dite jupe (2a) servant de cylindre au piston de haute pression pneumatique (4) dont la tige (5) coulisse dans l'alésage central (3a) de l'ensemble (3-6).3. A pneumatic cylinder according to claim 1, characterized in that the front compartment (1B) serves as a cylinder for the fast-forward stroke piston (2) integral with the pressure rod (20), the said piston (2) continues towards the rear by a skirt (2a) integral with the tail (3) of the power piston (6), said skirt (2a) serving as a cylinder for the pneumatic high pressure piston (4), the rod of which (5) slides in the central bore (3a) of the assembly (3-6). 4.- Vérin selon la revendication 2, caractérisé en ce que l'alésage central (3a) débouche d'une part dans le volume externe (V2) et peut-être en communication avec le volume (VI) par des canaux (12) pratiqués dans la queue (3) près du piston (6) pour une certaine position de la tige-tiroir (5).4. A cylinder according to claim 2, characterized in that the central bore (3a) opens on the one hand into the external volume (V2) and perhaps in communication with the volume (VI) by channels (12) made in the tail (3) near the piston (6) for a certain position of the spool (5). 5.- Vérin selon l'une des revendications précédentes, caractérisé en ce que la queue (3) portant le piston (6) coulisse par rapport à un piston placé dans le volume (VI) à proximité de la cloison (la) dont il est séparé par l'action d'un ressort de compression (10).5. Cylinder according to one of the preceding claims, characterized in that the tail (3) carrying the piston (6) slides relative to a piston placed in the volume (VI) near the partition (la) from which it is separated by the action of a compression spring (10). 6.- Vérin selon l'une des revendications précédentes et comportant des distributeurs placés dans les circuits d'alimentation commandant le déplacement des pistons, caractérisé en ce que les circuits aboutissant à (Pl et P2) sont dépendants de la position du tiroir d'un premier distributeur (Dl) ; le circuit de (P2) agissant sur un pressostat (PS) qui agit à son tour, lorsque les conditions de pression requises sont atteintes sur le distributeur (D2) permettant l'alimentation (P3).6. Cylinder according to one of the preceding claims and comprising distributors placed in the supply circuits controlling the movement of the pistons, characterized in that the circuits leading to (Pl and P2) are dependent on the position of the drawer a first distributor (Dl); the circuit of (P2) acting on a pressure switch (PS) which in turn acts, when the required pressure conditions are reached on the distributor (D2) allowing the supply (P3). 7.- Vérin selon la revendication 6, caractérisé en ce que l'entrée (P3) est placée de manière à faire reculer le piston de haute pression pneumatique (4), alors que le circuit de P2 appliqué au piston d'avance rapide (2) fait avancer ce dernier piston.7. A cylinder according to claim 6, characterized in that the inlet (P3) is placed so as to cause the pneumatic high pressure piston to move back (4), while the P2 circuit applied to the fast advance piston ( 2) advances this last piston.
EP84401304A 1983-06-24 1984-06-22 Actuator having a pressure intensifier Withdrawn EP0130890A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8310437 1983-06-24
FR8310437A FR2547871B1 (en) 1983-06-24 1983-06-24 PRESSURE MULTIPLIER

Publications (1)

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EP0130890A1 true EP0130890A1 (en) 1985-01-09

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EP84401304A Withdrawn EP0130890A1 (en) 1983-06-24 1984-06-22 Actuator having a pressure intensifier

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EP (1) EP0130890A1 (en)
ES (1) ES280177Y (en)
FR (1) FR2547871B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355780A1 (en) * 1988-08-24 1990-02-28 RAPP, Eugen Method for filling a hydro-pneumatic pressure amplifier with oil, and apparatus therefor
EP0742373A1 (en) * 1995-05-09 1996-11-13 Zsolt Szabo Pneumatic drive unit
WO2003102428A1 (en) * 2002-05-31 2003-12-11 Tox Pressotechnik Gmbh & Co. Kg Method for switching a hydraulic pressure intensifier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL263167A (en) *
US3410089A (en) * 1967-03-08 1968-11-12 Joseph D. Snitgen Fluid operated device
DE1426472A1 (en) * 1963-06-10 1968-11-21 Calkins John Leroy Pressure booster

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL263167A (en) *
DE1426472A1 (en) * 1963-06-10 1968-11-21 Calkins John Leroy Pressure booster
US3410089A (en) * 1967-03-08 1968-11-12 Joseph D. Snitgen Fluid operated device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355780A1 (en) * 1988-08-24 1990-02-28 RAPP, Eugen Method for filling a hydro-pneumatic pressure amplifier with oil, and apparatus therefor
EP0742373A1 (en) * 1995-05-09 1996-11-13 Zsolt Szabo Pneumatic drive unit
WO2003102428A1 (en) * 2002-05-31 2003-12-11 Tox Pressotechnik Gmbh & Co. Kg Method for switching a hydraulic pressure intensifier

Also Published As

Publication number Publication date
FR2547871A1 (en) 1984-12-28
ES280177U (en) 1985-02-16
FR2547871B1 (en) 1987-10-16
ES280177Y (en) 1985-09-01

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