EP0130879A1 - Device for the automatic reversal of the feed to a double acting ram by a simple or double acting control - Google Patents

Device for the automatic reversal of the feed to a double acting ram by a simple or double acting control Download PDF

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Publication number
EP0130879A1
EP0130879A1 EP84401258A EP84401258A EP0130879A1 EP 0130879 A1 EP0130879 A1 EP 0130879A1 EP 84401258 A EP84401258 A EP 84401258A EP 84401258 A EP84401258 A EP 84401258A EP 0130879 A1 EP0130879 A1 EP 0130879A1
Authority
EP
European Patent Office
Prior art keywords
flow
chamber
double acting
valve
jack
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.)
Granted
Application number
EP84401258A
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German (de)
French (fr)
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EP0130879B1 (en
Inventor
Alain Tessier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enerpac Tool Group Corp
Original Assignee
Applied Power Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Applied Power Inc filed Critical Applied Power Inc
Publication of EP0130879A1 publication Critical patent/EP0130879A1/en
Application granted granted Critical
Publication of EP0130879B1 publication Critical patent/EP0130879B1/en
Expired legal-status Critical Current

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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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/15—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor with special provision for automatic return

Definitions

  • the present invention relates to a device for automatically reversing the supply of a double-acting hydraulic cylinder from a single or double-acting control.
  • the information which triggers the inversion is advantageously taken from the cylinder drain chamber.
  • a feeler means notes the state of flow of the chamber emptying the jack as the state of absence of flow of this chamber.
  • the inversion is not controlled. As soon as the flow ceases, the inversion is controlled and stored until the end of the cycle.
  • the cylinder From a stable position, the cylinder performs an automatic return trip per cycle.
  • the actuator has its stable position rod extended or rod retracted and the automatic reversal takes place as soon as it stops; either in internal stop or in external stop.
  • the flow sensing means is controlled by a time delay which authorizes or does not authorize the piloting of a reversing distributor.
  • the device according to the invention comprises a feeler means (11-12-12A-15) which ascertains the state of flow and the state of no flow of the chamber emptying the jack; a time delay means (5-6-9-10) which delays the recognition of this flow; and a piloted check valve (1-2-3-4-22) which locks the double-acting cylinder in question in the rod-out position.
  • Figure 1 shows the device at rest, that is to say that its ports P (pressure) and V (drain) can be closed or open to the tank and by the external control distributor (not shown).
  • the cylinder connected to ports A and B is locked with the rod out by the piloted check valve (1-2-3-4-22).
  • the double effect automatic supply of the device is effective at passages A1 and B1.
  • the supply available in A1 and B1 is firstly when the pressurized fluid leaves via B1, while A1 is draining and a second reverse time, that is to say that the fluid goes out by A1, while B1 is draining.
  • the fluid When the fluid under pressure is admitted at P, the orifice V being for emptying (FIG. 1), the fluid actuates a piston 5 of the time delay (5-6-9-10) delimiting two chambers: a chamber 10 which communicates with passage B1 and a chamber 9 which communicates with passage A1, via a calibrated orifice 8. In its normal rest position the piston 5 is returned by a spring 6 and closes a passage 7. The time required to empty the chamber 9 through the calibrated orifice 8 determines the time delay which makes it possible to wait until the movement of the jack is started before noticing the state of drain flow, that is to say closing passages 12 and 12A before opening passage 7.
  • Figure 2 shows the actuator moving in the retracted direction of the rod.
  • the fluid arriving from P fills the annular section of the jack and actuates a pilot 1 which opens a valve 3 of the pilot check valve (1-2-3-4-22).
  • the fluid contained in the bottom section of the jack is evacuated to a space 13 where it is forced, to pass to a passage 14, to move a drawer (11) flow sensor (11-12-12A-15), which closes passages 12 and 12'A.
  • the time required to start the cylinder that is to say from the admission of the fluid until the passages 12 and 12A are closed, is shorter than the displacement of the piston (5) from the time delay, until the opening of the passage 7.
  • the fluid still admitted at P flows through a space 18 and will feed the full section of the jack through a valve 19 and the valve 3.
  • a valve 20 opens to let the fluid pass into a chamber 21
  • a valve 27 prevents the fluid admitted into the chamber 21 from draining through 12, 12A and 7 (the passage 7 does not close immediately).
  • valve (20) and valve (27) constitutes a memorization of the position of the drawer (17) which is maintained by the pilot valve (16) as long as there is pressure at (P).
  • the fluid pushes the piston 5 of the time delay in its initial position.
  • the annular chamber of the jack, the chamber 10 and a chamber 22 of the pilot-operated check valve are emptied by a space 23 in communication with the orifice V.
  • valve 20 closes again and the fluid contained in the chamber 21 is evacuated through a calibrated orifice 24 thus allowing a transfer of volume.
  • the pilot 16, under the action of a spring 25, and the slide 17, under the action of a spring 26, can return to their initial position.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Structure Of Transmissions (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Electrotherapy Devices (AREA)

Abstract

1. Device permitting a cyclic automatic reversal of a double-action jack, characterized in that the information which triggers the reversal is taken from the draining chamber of the jack by a probe means (11, 12, 12A, 15) which ascertains the state of flow and the state of absence of flow from this draining chamber and triggers the reversal at a zero flow.

Description

La présente invention a pour objet un dispositif permettant l'inversion automatique de l'alimentation d'un vérin double effet hydraulique à partir d'une commande à simple ou double effet.The present invention relates to a device for automatically reversing the supply of a double-acting hydraulic cylinder from a single or double-acting control.

Dans un vérin double effet quand on admet un fluide sous pression dans une chambre, le fluide contenu dans l'autre chambre est expulsé vers le réservoir. Dès qu'une butée interne ou externe arrête le mouvement du vérin, le débit de vidange devient nul.In a double-acting cylinder when a fluid under pressure is admitted into one chamber, the fluid contained in the other chamber is expelled towards the reservoir. As soon as an internal or external stop stops the cylinder movement, the drain flow becomes zero.

Conformément à l'invention, l'information qui déclenche l'inversion est avantageusement prise sur la chambre en vidange du vérin.In accordance with the invention, the information which triggers the inversion is advantageously taken from the cylinder drain chamber.

Un moyen palpeur constate l'état de débit de la chambre en vidange du vérin comme l'état d'absence de débit de cette chambre.A feeler means notes the state of flow of the chamber emptying the jack as the state of absence of flow of this chamber.

Tant qu'il y a débit depuis ladite chambre, l'inversion n'est pas commandée. Dès que le débit cesse, l'inversion est commandée et mémorisée jusqu'à la fin du cycle.As long as there is flow from said chamber, the inversion is not controlled. As soon as the flow ceases, the inversion is controlled and stored until the end of the cycle.

Depuis une position stable, le vérin effectue un aller et retour automatique par cycle. Selon son sens de raccordement au dispositif conforme à l'invention, le vérin a sa position stable tige sortie ou tige rentrée et l'inversion automatique a lieu dès son arrêt ; soit en butée interne, soit en butée externe.From a stable position, the cylinder performs an automatic return trip per cycle. According to its direction of connection to the device according to the invention, the actuator has its stable position rod extended or rod retracted and the automatic reversal takes place as soon as it stops; either in internal stop or in external stop.

Le moyen palpeur de débit est contrôlé par une temporisation qui autorise ou n'autorise pas le pilotage d'un distributeur inverseur.The flow sensing means is controlled by a time delay which authorizes or does not authorize the piloting of a reversing distributor.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description qui va suivre faite en regard des dessins annexés, sur lesquels :

  • - la figure 1 est un schéma d'un dispositif selon l'invention, au repos ;
  • - les figures 2 à 4 sont des schémas montrant ce même dispositif dans d'autres phases de fonctionnement.
Other characteristics and advantages of the present invention will emerge from the description which follows, given with reference to the appended drawings, in which:
  • - Figure 1 is a diagram of a device according to the invention, at rest;
  • - Figures 2 to 4 are diagrams showing this same device in other operating phases.

D'une façon générale, le dispositif selon l'invention comprend un moyen palpeur (11-12-12A-15) qui constate l'état de débit et l'état d'absence de débit de la chambre en vidange du vérin ; un moyen de temporisation (5-6-9-10) qui retarde le constat de ce débit ; et un clapet de retenue piloté (1-2-3-4-22) qui verrouille en position tige sortie le vérin double effet considéré.In general, the device according to the invention comprises a feeler means (11-12-12A-15) which ascertains the state of flow and the state of no flow of the chamber emptying the jack; a time delay means (5-6-9-10) which delays the recognition of this flow; and a piloted check valve (1-2-3-4-22) which locks the double-acting cylinder in question in the rod-out position.

La figure 1 représente le dispositif au repos, c'est-à-dire que ses orifices P (pression) et V (vidange) peuvent être fermés ou ouverts vers le réservoir et par le distributeur de commande extérieur (non représentés). Le vérin relié à des orifices A et B est verrouillé tige sortie par le clapet de retenue piloté (1-2-3-4-22). L'alimentation automatique double effet du dispositif est effective à des passages A1 et B1.Figure 1 shows the device at rest, that is to say that its ports P (pressure) and V (drain) can be closed or open to the tank and by the external control distributor (not shown). The cylinder connected to ports A and B is locked with the rod out by the piloted check valve (1-2-3-4-22). The double effect automatic supply of the device is effective at passages A1 and B1.

D'une manière générale, l'alimentation disponible en A1 et B1 est un premier temps où le fluide sous pression sort par B1, tandis que A1 est à la vidange et un second temps inverse, c'est-à-dire que le fluide sort par A1, tandis que B1 est à la vidange.In general, the supply available in A1 and B1 is firstly when the pressurized fluid leaves via B1, while A1 is draining and a second reverse time, that is to say that the fluid goes out by A1, while B1 is draining.

Quand on admet le fluide sous pression en P, l'orifice V étant à la vidange (figure 1), le fluide actionne un piston 5 de la temporisation (5-6-9-10) délimitant deux chambres : une chambre 10 qui communique avec le passage B1 et une chambre 9 qui communique avec le passage A1, par l'intermédiaire d'un orifice calibré 8. Dans sa position normale de repos le piston 5 est rappelé par un ressort 6 et ferme un passage 7. Le temps nécessaire pour vider la chambre 9 au travers de l'orifice calibré 8 détermine la temporisation qui permet d'attendre que le mouvement du vérin soit commencé avant de constater l'état de débit de vidange, c'est-à-dire fermer des passages 12 et 12A avant d'ouvrir le passage 7.When the fluid under pressure is admitted at P, the orifice V being for emptying (FIG. 1), the fluid actuates a piston 5 of the time delay (5-6-9-10) delimiting two chambers: a chamber 10 which communicates with passage B1 and a chamber 9 which communicates with passage A1, via a calibrated orifice 8. In its normal rest position the piston 5 is returned by a spring 6 and closes a passage 7. The time required to empty the chamber 9 through the calibrated orifice 8 determines the time delay which makes it possible to wait until the movement of the jack is started before noticing the state of drain flow, that is to say closing passages 12 and 12A before opening passage 7.

La figure 2 représente le vérin en mouvement dans le sens rentrée de tige. Le fluide arrivant de P remplit la section annulaire du vérin et actionne un pilote 1 qui ouvre un clapet 3 du clapet de retenue pilote (1-2-3-4-22). Le fluide contenu dans la section du fond du vérin s'évacue jusqu'à un espace 13 où il est obligé, pour passer vers un passage 14, de déplacer un tiroir (11) du palpeur de débit (11-12-12A-15), ce qui ferme les passages 12 et 12'A. Le temps nécessaire au démarrage du vérin, c'est-à-dire depuis l'admission du fluide jusqu'à la fermeture des passages 12 et 12A, est plus court que le déplacement du piston (5) de la temporisation, jusqu'à l'ouverture du passage 7.Figure 2 shows the actuator moving in the retracted direction of the rod. The fluid arriving from P fills the annular section of the jack and actuates a pilot 1 which opens a valve 3 of the pilot check valve (1-2-3-4-22). The fluid contained in the bottom section of the jack is evacuated to a space 13 where it is forced, to pass to a passage 14, to move a drawer (11) flow sensor (11-12-12A-15), which closes passages 12 and 12'A. The time required to start the cylinder, that is to say from the admission of the fluid until the passages 12 and 12A are closed, is shorter than the displacement of the piston (5) from the time delay, until the opening of the passage 7.

Dès que le déplacement du vérin cesse par la butée interne ou une butée externe (figure 3), le débit de vidange cesse dans l'espace 13 et le tiroir (11) revient à sa position initiale rappelé par un ressort (15), ce qui ouvre les passages 12 et 12A et permet au fluide toujours admis en P de pousser, dans un premier temps, un clapet de vidange 16 et, dans un deuxième temps, un tiroir d'inversion 17.As soon as the displacement of the jack ceases by the internal stop or an external stop (FIG. 3), the emptying rate ceases in the space 13 and the drawer (11) returns to its initial position recalled by a spring (15), this which opens the passages 12 and 12A and allows the fluid still admitted at P to push, firstly, a drain valve 16 and, secondly, an inversion drawer 17.

Le fluide toujours admis en P (figure 4) coule par un espace 18 et va alimenter la section pleine du vérin au travers d'un clapet 19 et du clapet 3. Un clapet 20 s'ouvre pour laisser passer le fluide dans une chambre 21. Un clapet 27 empêche le fluide admis dans la chambre 21 de se vidanger par 12, 12A et 7 (le passage 7 ne se ferme pas immédiatement) .The fluid still admitted at P (FIG. 4) flows through a space 18 and will feed the full section of the jack through a valve 19 and the valve 3. A valve 20 opens to let the fluid pass into a chamber 21 A valve 27 prevents the fluid admitted into the chamber 21 from draining through 12, 12A and 7 (the passage 7 does not close immediately).

Cette disposition à clapet (20) et clapet (27) constitue une mémorisation de position du tiroir (17) qui est maintenu par le clapet-pilote (16) tant qu'il y a pression en (P). Par l'orifice calibré 8, le fluide repousse le piston 5 de la temporisation dans sa position initiale. La chambre annulaire du vérin, la chambre 10 et une chambre 22 du clapet de retenu piloté se vidangent par un espace 23 en communication avec l'orifice V.This arrangement with valve (20) and valve (27) constitutes a memorization of the position of the drawer (17) which is maintained by the pilot valve (16) as long as there is pressure at (P). Through the calibrated orifice 8, the fluid pushes the piston 5 of the time delay in its initial position. The annular chamber of the jack, the chamber 10 and a chamber 22 of the pilot-operated check valve are emptied by a space 23 in communication with the orifice V.

Quand la pression en P est coupée, le clapet 20 se referme et le fluide contenu dans la chambre 21 s'évacue par un orifice calibré 24 permettant ainsi un transfert de volume. Le pilote 16, sous l'action d'un ressort 25, et le tiroir 17, sous l'action d'un ressort 26, peuvent reprendre leur position initiale.When the pressure at P is cut, the valve 20 closes again and the fluid contained in the chamber 21 is evacuated through a calibrated orifice 24 thus allowing a transfer of volume. The pilot 16, under the action of a spring 25, and the slide 17, under the action of a spring 26, can return to their initial position.

Il est bien entendu que la présente invention n'a été décrite et représentée qu'à titre d'exemple préférentiel et que l'on pourra apporter des équivalences dans ses éléments constitutifs, sans, pour autant, sortir du cadre de l'invention.It is understood that the present invention has been described and shown only by way of example preferential and that it will be possible to provide equivalences in its constituent elements, without, however, departing from the scope of the invention.

C'est ainsi que depuis les passages A1 et B1, il est possible d'effectuer des schémas de branchement de vérin et de clapet de retenue piloté différents sans changer le fonctionnement du dispositif, c'est-à-dire :

  • - verrouiller la section annulaire du vérin et laisser libre la section pleine du vérin ;
  • - verrouiller les deux sections ;
  • - inverser le sens de déplacement du cycle en inversant le vérin etc.
Thus, from passages A1 and B1, it is possible to make different connection diagrams for actuator and pilot operated check valve without changing the operation of the device, that is to say:
  • - lock the annular section of the jack and leave the full section of the jack free;
  • - lock the two sections;
  • - reverse the direction of movement of the cycle by reversing the cylinder etc.

Claims (4)

1. Dispositif permettant une inversion automatique par cycle d'un vérin double effet, caractérisé en ce que l'information qui déclenche l'inversion est prise sur la chambre en vidange du vérin.1. Device allowing automatic reversal by cycle of a double-acting cylinder, characterized in that the information which triggers the reversal is taken from the chamber in which the cylinder is drained. 2. Dispositif selon la revendication 1, caractérisé en ce qu'un moyen palpeur (11-12-12A-15) constate l'état de débit et l'état d'absence de débit de la chambre en vidange du vérin et déclenche l'inversion pour un débit nul.2. Device according to claim 1, characterized in that a feeler means (11-12-12A-15) notes the state of flow and the state of no flow of the chamber for emptying the jack and triggers l 'inversion for zero flow. 3. Dispositif selon la revendication 2, caractérisé en ce qu'un moyen de temporisation (5-6-9-10) retarde le constat de débit de la chambre en vidange pour permettre au vérin de démarrer.3. Device according to claim 2, characterized in that a time delay means (5-6-9-10) delays the finding of flow of the drain chamber to allow the cylinder to start. 4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comprend un tiroir d'inversion (17) maintenu en position poussée par un clapet de vidange (16) laquelle position est mémorisée par un clapet (20) et un clapet (27) tant qu'il y a pression en (P).4. Device according to any one of claims 1 to 3, characterized in that it comprises an inversion drawer (17) held in the pushed position by a drain valve (16) which position is memorized by a valve (20 ) and a valve (27) as long as there is pressure at (P).
EP84401258A 1983-06-29 1984-06-18 Device for the automatic reversal of the feed to a double acting ram by a simple or double acting control Expired EP0130879B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8310753A FR2548288B1 (en) 1983-06-29 1983-06-29 DEVICE FOR AUTOMATICALLY INVERTING THE SUPPLY OF A DOUBLE HYDRAULIC ACTUATOR FROM A SINGLE OR DOUBLE ACTING CONTROL
FR8310753 1983-06-29

Publications (2)

Publication Number Publication Date
EP0130879A1 true EP0130879A1 (en) 1985-01-09
EP0130879B1 EP0130879B1 (en) 1987-07-29

Family

ID=9290297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84401258A Expired EP0130879B1 (en) 1983-06-29 1984-06-18 Device for the automatic reversal of the feed to a double acting ram by a simple or double acting control

Country Status (6)

Country Link
EP (1) EP0130879B1 (en)
DE (1) DE3465130D1 (en)
ES (1) ES533805A0 (en)
FI (1) FI79893C (en)
FR (1) FR2548288B1 (en)
NO (1) NO157469C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379811A2 (en) * 1989-01-25 1990-08-01 Huard S.A. Device for automatically swapping the actuating direction of a double acting hydraulic cylinder
FR2643423A1 (en) * 1989-02-22 1990-08-24 Forhydro Ets Hydraulic automation
EP0434531A1 (en) * 1989-12-22 1991-06-26 Power Packer France Sa Device for initiating auto-reverse movement of a double acting hydraulic cylinder
FR2656386A1 (en) * 1989-12-22 1991-06-28 Matairco Hydro Air Sa

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH520273A (en) * 1970-02-25 1972-03-15 Engeler Markus Hydraulic control unit
FR2465909A1 (en) * 1979-09-19 1981-03-27 Applied Power Inc Two way linear actuator with integral inverter - has inversion directly actuated by piston at end of stroke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH520273A (en) * 1970-02-25 1972-03-15 Engeler Markus Hydraulic control unit
FR2465909A1 (en) * 1979-09-19 1981-03-27 Applied Power Inc Two way linear actuator with integral inverter - has inversion directly actuated by piston at end of stroke

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379811A2 (en) * 1989-01-25 1990-08-01 Huard S.A. Device for automatically swapping the actuating direction of a double acting hydraulic cylinder
EP0379811A3 (en) * 1989-01-25 1991-10-23 Huard S.A. Device for automatically swapping the actuating direction of a double acting hydraulic cylinder
FR2643423A1 (en) * 1989-02-22 1990-08-24 Forhydro Ets Hydraulic automation
EP0434531A1 (en) * 1989-12-22 1991-06-26 Power Packer France Sa Device for initiating auto-reverse movement of a double acting hydraulic cylinder
FR2656386A1 (en) * 1989-12-22 1991-06-28 Matairco Hydro Air Sa
FR2656385A1 (en) * 1989-12-22 1991-06-28 Matairco Hydro Air Sa
EP0438936A1 (en) * 1989-12-22 1991-07-31 Power Packer France Sa Device for an automatic return of a hydraulic double-acting cylinder

Also Published As

Publication number Publication date
FI79893C (en) 1990-03-12
FI842424A0 (en) 1984-06-14
FR2548288B1 (en) 1985-12-13
EP0130879B1 (en) 1987-07-29
FI79893B (en) 1989-11-30
FR2548288A1 (en) 1985-01-04
FI842424A (en) 1984-12-30
NO157469C (en) 1988-03-23
ES8503792A1 (en) 1985-03-01
ES533805A0 (en) 1985-03-01
NO842616L (en) 1985-01-02
DE3465130D1 (en) 1987-09-03
NO157469B (en) 1987-12-14

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