EP0379811A2 - Vorrichtung zur automatischen Wirkrichtungsumkehr eines doppeltwirkenden, hydraulischen Stellzylinders - Google Patents

Vorrichtung zur automatischen Wirkrichtungsumkehr eines doppeltwirkenden, hydraulischen Stellzylinders Download PDF

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Publication number
EP0379811A2
EP0379811A2 EP89402942A EP89402942A EP0379811A2 EP 0379811 A2 EP0379811 A2 EP 0379811A2 EP 89402942 A EP89402942 A EP 89402942A EP 89402942 A EP89402942 A EP 89402942A EP 0379811 A2 EP0379811 A2 EP 0379811A2
Authority
EP
European Patent Office
Prior art keywords
chamber
pressure
valve
block
drawer
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.)
Withdrawn
Application number
EP89402942A
Other languages
English (en)
French (fr)
Other versions
EP0379811A3 (de
Inventor
Louis Perret
Guy Gentilhomme
Jean-Paul Cadorel
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.)
HUARD SA
Original Assignee
HUARD SA
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 HUARD SA filed Critical HUARD SA
Publication of EP0379811A2 publication Critical patent/EP0379811A2/de
Publication of EP0379811A3 publication Critical patent/EP0379811A3/de
Withdrawn legal-status Critical Current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 an improvement to devices for automatically reversing the operating direction of a double-acting hydraulic cylinder, used in particular for turning the frame supporting the symmetrical plowing bodies of a reversible plow.
  • the rotating part of a plow does not have the center of gravity in the same place depending on the number of plows and the spacing between them.
  • the main drawback of these devices is that if the moment exerted by the plowing bodies is resistant during the first quarter turn, as is frequent, in particular with a plow with variable width between bodies, (the working width can vary by 1 meter between the minimum and maximum width settings), there is a premature reversal of the direction of flow of the fluid in the system, which brings the rotating part back to its starting point.
  • a third drawback of these known reversing devices is that at the end of reversal, as long as the control valve is not brought back to neutral, the maximum pressure is applied to the cylinder end of travel stop, which can cause a matting and breaking the stop.
  • the invention aims to eliminate the aforementioned drawbacks by improving the devices for automatic reversal of the linear movement of a known jack.
  • the known reversing unit 1 comprises a distribution slide 2 whose displacement in one direction (to the right in the figure) is ensured by the high pressure, by means of a piston or finger 3 sliding in a bore 3a s' extending axially in the bottom of the housing 1 and pressing on the front face 2a of the drawer 2.
  • the movement in the opposite direction is ensured by a calibrated spring 4.
  • the drawer 2 has two peripheral grooves 19 and 20.
  • Block 1 has three other orifices 1c, 1d, 1e.
  • the orifice 1d is connected to the annular chamber 6a of a hydraulic cylinder 6 and the orifices 1c and 1e are connected to the free chamber 6b of the cylinder by a pipe 8 through a check valve 9 controlled by the high pressure.
  • the return to the cover is ensured by the pipe 10 from the orifice 1f of block 1, in direct communication with the chamber 1g of block 1.
  • a throttle 11 is placed on the pipe 10 at the exit of the chamber 1g.
  • the choke 11 is dimensioned located at the outlet of the chamber 1g towards the tank, and normally used to limit the flow rate of the pipe 10, so that a sufficient flow rate can be established in the pipe 10 so as to ensure in this room a sufficient pressure.
  • the pressure in this chamber 1g must not exceed a certain value, for example 2 MPa.
  • a non-return valve 13 calibrated to the prescribed value (here 2 MPa). Thanks to this, the discharge of the fluid from the free chamber 6b via the line 8 and the orifice 1c creates a pressure in the chamber 1g sufficient to maintain the drawer in the position shown, until the top dead center is reached. , without however exceeding a safety value.
  • the pressure may drop in chamber 6b, line 8 and chamber 1g, and the drawer will be able to slide to reverse the direction of linear movement of the jack.
  • a retarder valve 14 is arranged in series with a throttle.
  • This valve is provided with a piston subjected on one side to high pressure at the start of the cycle and capable of sliding under the effect of this pressure against a calibrated spring to release after a certain period of time a orifice 14a connected to the chamber 12 located behind the finger 3.
  • This piston is provided with a calibrated hole to allow the piston to return under the effect of the spring.
  • the unbalance is motor in the example described above. Therefore, the chamber 6a empties faster than the chamber 6b is filled. It will therefore penetrate air into the chamber 6b and during the next reversal, the compression of this air will cause jolts and premature inversion of the drawer 2.
  • the presence of the retarder valve 14 avoids this drawback. In fact, the progressive displacement of the piston will not put the pressurized fluid 5 in communication with the chamber 12 located behind the finger 3 until after a determined time, during which the top dead center is reached.
  • a flow regulator 15 is mounted between the discharge pipe 10 and the orifice 1h of the body 1. This regulator acts only during the second quarter of a turn so that the speed of delivery of the fluid is constant, whatever the sense and intensity of unbalance.
  • This regulator comprises a valve drawer 16 returned to its seat by a spring 17. The fluid flows through a calibrated hole 16a and the orifice 15a more or less closed according to the flow rate or by a calibrated hole 16b when the flow rate is maximum and that the valve 16 is completely pushed back.
  • a valve is placed between the chamber 6a and the orifice 1c check valve 18 calibrated to a specific value lower than the pressure required during the first quarter turn.
  • the pressurized fluid arrives via the pipe 5. It passes through the orifice 1b, the peripheral channel 20 and the orifice 1d, and arrives via the pipe 7 at the annular chamber 6a of the jack 6 while controlling the valve 9 which s open.
  • the fluid contained in the free chamber 6b is discharged towards the orifice 1c via the open valve 9 and reaches the chamber 1g to flow through the throttle 11 (and the valve 13, if the pressure is equal to or greater than its calibration, for example 2 MPa), towards the sheet by the line 10.
  • the slide valve 14 moves to discover the orifice 14a.
  • the pressure then rises in chamber 12 while meanwhile the piston of the jack has reached the end of its travel.
  • the pressure in the chamber 12 acts on the finger 3 which then pushes the drawer 2 against the effect of the spring 4 and of the pressure prevailing in the chamber 1g.
  • the pressurized fluid then reaches the free chamber 6b of the cylinder through the orifices 1b, 1e and the valve 9 raised. It also maintains the drawer 2 in the second position taken by applying its pressure to the face 2a of the drawer, the flow rate between the orifice 1j and the return pipe 10 being limited by at least one throttle.
  • the second quarter-turn takes place while the fluid in the chamber 6a of the jack flows towards the tank through the orifice 1d and 1h, the flow regulator 15 and the pipe 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP19890402942 1989-01-25 1989-10-25 Vorrichtung zur automatischen Wirkrichtungsumkehr eines doppeltwirkenden, hydraulischen Stellzylinders Withdrawn EP0379811A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8900883A FR2642117B3 (fr) 1989-01-25 1989-01-25 Dispositif d'inversion automatique du sens de fonctionnement d'un verin hydraulique a double effet
FR8900883 1989-01-25

Publications (2)

Publication Number Publication Date
EP0379811A2 true EP0379811A2 (de) 1990-08-01
EP0379811A3 EP0379811A3 (de) 1991-10-23

Family

ID=9378073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890402942 Withdrawn EP0379811A3 (de) 1989-01-25 1989-10-25 Vorrichtung zur automatischen Wirkrichtungsumkehr eines doppeltwirkenden, hydraulischen Stellzylinders

Country Status (2)

Country Link
EP (1) EP0379811A3 (de)
FR (1) FR2642117B3 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004786A1 (en) * 1983-05-21 1984-12-06 Massey Ferguson Gmbh Fluid pressure system and valve therefor
EP0130879A1 (de) * 1983-06-29 1985-01-09 Applied Power Inc. Vorrichtung zur automatischen Umkehr von doppelt wirkenden Hydraulikzylindern, ausgelöst durch eine einfach oder doppelt wirkende Steuerung
DE3502021C1 (de) * 1985-01-23 1986-03-13 Integral Hydraulik & Co, 4000 Düsseldorf Umsteuereinrichtung
DE3611710C1 (en) * 1986-04-08 1987-07-30 Integral Hydraulik Co Reversing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004786A1 (en) * 1983-05-21 1984-12-06 Massey Ferguson Gmbh Fluid pressure system and valve therefor
EP0130879A1 (de) * 1983-06-29 1985-01-09 Applied Power Inc. Vorrichtung zur automatischen Umkehr von doppelt wirkenden Hydraulikzylindern, ausgelöst durch eine einfach oder doppelt wirkende Steuerung
DE3502021C1 (de) * 1985-01-23 1986-03-13 Integral Hydraulik & Co, 4000 Düsseldorf Umsteuereinrichtung
DE3611710C1 (en) * 1986-04-08 1987-07-30 Integral Hydraulik Co Reversing device

Also Published As

Publication number Publication date
FR2642117A1 (fr) 1990-07-27
FR2642117B3 (fr) 1991-03-15
EP0379811A3 (de) 1991-10-23

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