EP0130879B1 - Dispositif permettant l'inversion automatique de l'alimentation d'un vérin double effet hydraulique à partir d'une commande à simple ou double effet - Google Patents
Dispositif permettant l'inversion automatique de l'alimentation d'un vérin double effet hydraulique à partir d'une commande à simple ou double effet Download PDFInfo
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 16
- 230000001934 delay Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims 3
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
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.
Landscapes
- 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)
- Mechanical Treatment Of Semiconductor (AREA)
- Structure Of Transmissions (AREA)
- Electrotherapy Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8310753 | 1983-06-29 | ||
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0130879A1 EP0130879A1 (fr) | 1985-01-09 |
EP0130879B1 true EP0130879B1 (fr) | 1987-07-29 |
Family
ID=9290297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84401258A Expired EP0130879B1 (fr) | 1983-06-29 | 1984-06-18 | Dispositif permettant l'inversion automatique de l'alimentation d'un vérin double effet hydraulique à partir d'une commande à simple ou double effet |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0130879B1 (sv) |
DE (1) | DE3465130D1 (sv) |
ES (1) | ES8503792A1 (sv) |
FI (1) | FI79893C (sv) |
FR (1) | FR2548288B1 (sv) |
NO (1) | NO157469C (sv) |
Families Citing this family (4)
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 |
FR2656386B1 (sv) * | 1989-12-22 | 1992-04-30 | Matairco Hydro Air Sa | |
FR2656385B1 (sv) * | 1989-12-22 | 1992-04-30 | Matairco Hydro Air Sa |
Family Cites Families (2)
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 |
-
1983
- 1983-06-29 FR FR8310753A patent/FR2548288B1/fr not_active Expired
-
1984
- 1984-06-14 FI FI842424A patent/FI79893C/sv not_active IP Right Cessation
- 1984-06-18 EP EP84401258A patent/EP0130879B1/fr not_active Expired
- 1984-06-18 DE DE8484401258T patent/DE3465130D1/de not_active Expired
- 1984-06-28 ES ES533805A patent/ES8503792A1/es not_active Expired
- 1984-06-28 NO NO842616A patent/NO157469C/no not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3465130D1 (en) | 1987-09-03 |
NO842616L (no) | 1985-01-02 |
FI842424A (fi) | 1984-12-30 |
FI79893B (fi) | 1989-11-30 |
ES533805A0 (es) | 1985-03-01 |
EP0130879A1 (fr) | 1985-01-09 |
ES8503792A1 (es) | 1985-03-01 |
NO157469C (no) | 1988-03-23 |
NO157469B (no) | 1987-12-14 |
FR2548288B1 (fr) | 1985-12-13 |
FI842424A0 (fi) | 1984-06-14 |
FR2548288A1 (fr) | 1985-01-04 |
FI79893C (sv) | 1990-03-12 |
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