EP0130879B1 - Vorrichtung zur automatischen Umkehr von doppelt wirkenden Hydraulikzylindern, ausgelöst durch eine einfach oder doppelt wirkende Steuerung - Google Patents

Vorrichtung zur automatischen Umkehr von doppelt wirkenden Hydraulikzylindern, ausgelöst durch eine einfach oder doppelt wirkende Steuerung Download PDF

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Publication number
EP0130879B1
EP0130879B1 EP84401258A EP84401258A EP0130879B1 EP 0130879 B1 EP0130879 B1 EP 0130879B1 EP 84401258 A EP84401258 A EP 84401258A EP 84401258 A EP84401258 A EP 84401258A EP 0130879 B1 EP0130879 B1 EP 0130879B1
Authority
EP
European Patent Office
Prior art keywords
jack
reversal
chamber
double acting
valve
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.)
Expired
Application number
EP84401258A
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English (en)
French (fr)
Other versions
EP0130879A1 (de
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/de
Application granted granted Critical
Publication of EP0130879B1 publication Critical patent/EP0130879B1/de
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.
  • CH-A-520 273 discloses a device which uses the differences between the working pressure in the cylinder and the pressure of the pump. When the cylinder reaches the stop, the pressure increases and valves sensitive to this increase switch the distribution slide.
  • This sequence valve device has the disadvantage of requiring a pump with a power greater than that used by the receiver to obtain a pressure difference.
  • the switching pressure must always be between the maximum pressure generated by the receiver and the minimum pressure available at the pump, which means that significant differences must be chosen when the device is connected to variable pressure and flow sources (eg agricultural tractors).
  • FR-A-2 465 909 also discloses a hydraulic reversing system controlled by the rod of the jack.
  • the invention overcomes the aforementioned drawbacks by proposing a device exploiting this fact.
  • the information which triggers the inversion is taken from the cylinder draining chamber by a feeler means which notes the state of flow and the state of lack of flow from this draining chamber and triggers the reversal for a flow no.
  • 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.
  • a delay means delays the finding of zero flow from the emptying chamber to allow the jack to start in its normal rest position.
  • the device according to the invention comprises a feeler means (11, 12, 12A, 15) which notes the state of flow and the state of lack of flow from the chamber for 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 in the rod-out position the double-acting cylinder considered.
  • 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, in order to pass to a passage 14, to move a drawer 11 of the flow sensor (11-12-12A-15), which closes passages 12 and 12A.
  • 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 passage opening 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 position memorization of the drawer 17 which is maintained by the pilot valve 16 as long as there is pressure at P.
  • the fluid pushes back 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 piloted check valve (1-2-3-4-22) drain through 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)
  • Electrotherapy Devices (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Structure Of Transmissions (AREA)

Claims (3)

1. Vorrichtung, die eine automatische Umkehr pro Zyklus bei einem doppeltwirkenden Zylinder gestattet, dadurch gekennzeichnet, daß die Information, die die Umkehr auslöst, an der Abströmkammer des Zylinders durch ein Fühlermittel (11, 12, 12A, 15) erfaßt wird, das den Strömungszustand und den Zustand der Abwesenheit von Strömung von der Abströmkammer feststellt und die Umkehr bei einer Strömung Null auslöst.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein Verzögerungsmittel (5.6, 9, 10) die Feststellung der Strömung Null an der Abströmkammer verzögert, um es dem Zylinder zu erlauben, in seine normale Ruhestellung einzulaufen.
3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß sie einen Umkehr-Schieber (17) enthält, der in Schubstellung durch ein Abströmventil (16) gehalten ist, das einer Betätigung durch eine Zufuhr von Druckfluid mittels des Fühlermittels (11, 12, 12A, 15) zugänglich ist, daß ein Rückschlagventil (27) zwischen dem Fühlermittel und der Betätigungskammer (21) des Abströmventils (16) vorgesehen ist und daß nach der Umkehrung der Zylinderspeisung die Betätigungskammer (21) mit dem Druckeingang (P) über ein anderes Rückschlagventil (20) verbunden ist, wobei die Schubstellung folglich gespeichert ist, solange Druck am Druckeingang (P) vorhanden ist.
EP84401258A 1983-06-29 1984-06-18 Vorrichtung zur automatischen Umkehr von doppelt wirkenden Hydraulikzylindern, ausgelöst durch eine einfach oder doppelt wirkende Steuerung Expired EP0130879B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8310753A FR2548288B1 (fr) 1983-06-29 1983-06-29 Dispositif permettant l'inversion automatique de l'alimentation d'un verin double effet hydraulique a partir d'une commande a simple ou double effet
FR8310753 1983-06-29

Publications (2)

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

Family

ID=9290297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84401258A Expired EP0130879B1 (de) 1983-06-29 1984-06-18 Vorrichtung zur automatischen Umkehr von doppelt wirkenden Hydraulikzylindern, ausgelöst durch eine einfach oder doppelt wirkende Steuerung

Country Status (6)

Country Link
EP (1) EP0130879B1 (de)
DE (1) DE3465130D1 (de)
ES (1) ES8503792A1 (de)
FI (1) FI79893C (de)
FR (1) FR2548288B1 (de)
NO (1) NO157469C (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642117B3 (fr) * 1989-01-25 1991-03-15 Huard Sa Dispositif d'inversion automatique du sens de fonctionnement d'un verin hydraulique a double effet
FR2643423B1 (fr) * 1989-02-22 1991-05-10 Forhydro Ets Automatisme hydraulique
FR2656385B1 (de) * 1989-12-22 1992-04-30 Matairco Hydro Air Sa
FR2656386B1 (de) * 1989-12-22 1992-04-30 Matairco Hydro Air Sa

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH520273A (de) * 1970-02-25 1972-03-15 Engeler Markus Hydraulisches Steuergerät
FR2465909A1 (fr) * 1979-09-19 1981-03-27 Applied Power Inc Verin double effet a tiroir inverseur

Also Published As

Publication number Publication date
ES533805A0 (es) 1985-03-01
NO157469B (no) 1987-12-14
NO842616L (no) 1985-01-02
DE3465130D1 (en) 1987-09-03
FI842424A (fi) 1984-12-30
NO157469C (no) 1988-03-23
EP0130879A1 (de) 1985-01-09
ES8503792A1 (es) 1985-03-01
FI79893C (fi) 1990-03-12
FI79893B (fi) 1989-11-30
FR2548288A1 (fr) 1985-01-04
FI842424A0 (fi) 1984-06-14
FR2548288B1 (fr) 1985-12-13

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