EP0434531B1 - Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique - Google Patents

Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique Download PDF

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Publication number
EP0434531B1
EP0434531B1 EP90403611A EP90403611A EP0434531B1 EP 0434531 B1 EP0434531 B1 EP 0434531B1 EP 90403611 A EP90403611 A EP 90403611A EP 90403611 A EP90403611 A EP 90403611A EP 0434531 B1 EP0434531 B1 EP 0434531B1
Authority
EP
European Patent Office
Prior art keywords
orifice
slide valve
pressure
pump
cylinder
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 - Lifetime
Application number
EP90403611A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0434531A1 (fr
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 France SAS
Original Assignee
France Power Packer 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 France Power Packer SA filed Critical France Power Packer SA
Publication of EP0434531A1 publication Critical patent/EP0434531A1/fr
Application granted granted Critical
Publication of EP0434531B1 publication Critical patent/EP0434531B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 invention relates to a device for automatically making a round trip to a double-acting hydraulic cylinder.
  • a device for automatically making a round trip to a double-acting hydraulic cylinder is generally used for the reversing cylinder of the plows, so that the round trip that it must perform during the reversal of the plow is done while the driver has kept his hydraulic control in the same position.
  • Devices of this type therefore use the difference between the maximum working pressure of the jack in the forward stroke and the pressure that the pump provides when the jack is in abutment at the end of the forward stroke, i.e. the pressure maximum that the pump can provide.
  • the effect which it exerts need only be greater than the maximum value beyond which the jack has started a forward stroke. Indeed, once the outward stroke has started, the draining pressure exerts its effect which complements that exerted by the spring, so that the drawer is held in the first position even if the pressure supplied by the pump is close to its maximum value, the change in position of the slide can only occur when the drain pressure has disappeared, that is to say when the cylinder has reached the end of its outward travel.
  • the invention aims to provide a device in which these uncertainties are reduced. It is characterized in that the pressure drop means comprises means for regulating the drain pressure to a predetermined value.
  • this pressure regulating means makes it possible to prevent the draining pressure from dropping suddenly and to allow the position of the drawer to be changed when the jack has not yet reached the end of its outward travel but that the return flow has already decreased considerably.
  • the invention makes it possible to improve the efficiency of the device, since the pressure drop is constant, that is to say that unlike the prior device it does not increase with the flow rate until reaching particularly high values because of the importance which is generally given to the restriction in order to keep a draining pressure even when the flow becomes low.
  • said third surface and said predetermined value of the drain pressure are dimensioned so that the sum of the effects exerted by the spring and by the drain pressure is greater than the effect exerted through the first surface when the pressure supplied by the pump is equal to said second predetermined value.
  • the portions of the second and fourth paths located between the distributor and the fluid outlet orifice are distinct, the pressure regulating means being arranged on said portion of the second path, so that the drawer is only subjected to the action of the draining pressure during the forward stroke of the cylinder.
  • a non-return valve or a restriction is placed on said portion of the second path, in parallel with the pressure regulating means.
  • a restriction is placed on said portion of the fourth path.
  • the device 1 symbolized in FIG. 1 comprises as orifices, a fluid inlet orifice 2, a fluid outlet orifice 3, a first outlet orifice 4, and a second outlet orifice 5.
  • an inversion distributor 6 comprising a drawer 7 admitting a first position symbolized by the square 8 in which a first path allows fluid to pass from the orifice 2 to the orifice 4, while a second path allows fluid to pass from orifice 5 to orifice 3; whereas in the second position symbolized by the square 9, a third path allows fluid to pass from port 2 to port 5 while a fourth path allows fluid to pass from port 4 to port 3.
  • the orifices 2 and 3 are connected to a hydraulic control 10 which is itself connected by a pipe 11 to a pump (not shown) and by a pipe 12 to a tank (not shown).
  • the control 10 comprises a drawer with three positions, a central rest position symbolized by the square 13, a normal working position symbolized by the square 14, and a reverse position symbolized by the square 15, a manual pusher 16 being provided for pushing or pull the drawer out to put it in the desired position.
  • the ports 2 and 3 are at the same pressure, in the normal working position, the port 2 is connected to the pump and the port 3 to the tank, while in the reverse position it is the port 3 which is connected to the pump and port 2 to the tank.
  • the orifice 4 is connected by a pipe 17 to a first chamber 18 of the jack 19, the second chamber 20 being connected to the orifice 5 by a pipe 21 on which is arranged a piloted non-return valve 22.
  • the valve 22 closes the chamber 20 so that the cylinder 19 remains in the illustrated rod-out position, and when there is pressure in the duct 17, the pilot opens the valve 22 so that the fluid can flow from the chamber 20 at port 5.
  • the drawer 7 of the distributor 6 automatically switches to the second position symbolized by the rectangle 9, and there is then the orifice 5 which is connected to the pump and the orifice 4 to the reservoir, so that the actuator begins its return stroke, that is to say that the chamber 20 is filled and chamber 18 is emptied.
  • the drawer 7 remains in the second position as long as the drawer of the control 10 is in the normal working position.
  • the slide valve is subjected to the effect of a drain pressure created by and upstream of the pressure regulator 25 disposed upstream of the orifice 3, this pressure acting thanks to a pilot 26 by means of a third surface by urging the drawer towards the first position, that is to say by completing the effect exerted by the spring 23.
  • the third surface and the predetermined value of the draining pressure are dimensioned so that the sum of the effects exerted by the spring and the draining pressure is greater than the effect exerted by the intermediary of the first surface when the pressure supplied by the pump is equal to the second predetermined value indicated above. It is thus possible, in the same example, to have a drain pressure value fixed at 2 bars, and a third surface 45 times larger than the first surface.
  • a non-return valve 28 is arranged in parallel with the pressure regulator means 25.
  • This non-return valve allows, in the case where there is interrupted the connection with the pump during the forward stroke of the jack, to return it to its starting position: we then act on the pusher 16 of the control 10 to move to the reverse position symbolized by the rectangle 15, the orifice 3 is then connected to the pump and the fluid can pass through the portion 27 thanks to the non-return valve 28 which opens, the fluid therefore arrives at the orifice 5, opens the non-return valve 22 and can come to fill the chamber 20 while the chamber 18 empties through the first path located between the orifices 4 and 2.
  • a restriction 30 has been provided which makes it possible to slow down the return stroke of the jack 19.
  • FIGS. 2 to 4 We will now describe in support of FIGS. 2 to 4 a one-piece device 100 according to the invention, the references used in FIG. 1 having been kept for similar elements.
  • the drawer 7 of the dispenser is in the form of a cylindrical piston having a side wall in which is formed an annular groove 31 while an L-shaped conduit 32 formed in its thickness opens respectively into a first transverse end wall 33 and in the side wall near a second transverse end wall 34.
  • the drawer 7 further comprises in its thickness a second L-shaped duct 45 opening respectively into the transverse wall 33 and into the groove 31, a piston 46 being disposed in the section of the duct opening into the wall 33, this piston coming to bear on the wall 37 of the cylindrical hollow, and having a cross section corresponding to the surface value which has been called above first surface, by means of which the pressure of the pump acts on the slide in the first position.
  • the surface which has been called the second surface by means of which the pressure of the pump acts on the slide in the second position is produced by the wall 33
  • the surface which has been called the third surface, by means of which the draining pressure acts on the drawer is produced by the transverse wall 34 of the drawer.
  • conduit 32 is connected to a complementary conduit 47 opening into the side wall of the drawer, opposite the orifice 41 in the first position of the drawer. More precisely, the duct 47 is aligned with the section of the duct 32 which opens into the side wall of the drawer, so that this section and the duct 47 form a duct diametrically passing through the drawer.
  • Such a complementary duct is particularly advantageous because it simplifies the production of the seals between the drawer 7 and the side wall of the hollow in which it is movable. Indeed, if in the first position there are leaks between the annular groove 31 and the chamber 36, it will not result in overpressure in the chamber 36 which would disturb the operation of the device, since these leaks are eliminated towards the reservoir via conduits 32, 47 and 29. Likewise, if there are leaks between the annular groove 31 and the chamber 38, they can be recovered by the conduits 32, 47 and 29, and in any case the pressure regulating means will prevent an overpressure ensuing in the chamber 38.
  • the pressure regulating means comprises a piston 48, arranged coaxially with the slide 7 in a hollow cylinder adjacent by the wall 39 to the cylindrical hollow in which the slide 7 is movable, the body 35 being common to the distributor and to the pressure regulator.
  • the piston 48 moves more or less to the right of the figures against the spring 49 to more or less open the orifice 50, in order to keep the pressure in the chamber constant 38.
  • the piston 48 is annular and slides around a hollow shaft 51 opening into the chamber 38, as well as into the non-return valve 28 connected to the orifice 3.
  • conduit 52 having a restriction is formed between the conduit 32 and the chamber 38. This conduit 52 allows the drawer 7, when it is in the second position and that there is no longer any pressure supplied by the pump, to return to the first position, the fluid located in the chamber 36 being able to be transferred to the chamber 38 via the conduits 32 and 52.
  • the piloted check valve referenced 22 in FIG. 1 is produced in a body 53 distinct from the body 35, it comprises a non-return valve 54 and a pilot 55 subjected to the pressure prevailing in the conduit 17, which when it becomes sufficient pushes it to move to the right of the figures, and to open the valve 54, as seen in FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)
  • Braking Arrangements (AREA)
  • Soil Working Implements (AREA)
  • Types And Forms Of Lifts (AREA)
EP90403611A 1989-12-22 1990-12-14 Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique Expired - Lifetime EP0434531B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8917150 1989-12-22
FR8917150A FR2656385B1 (enrdf_load_stackoverflow) 1989-12-22 1989-12-22

Publications (2)

Publication Number Publication Date
EP0434531A1 EP0434531A1 (fr) 1991-06-26
EP0434531B1 true EP0434531B1 (fr) 1994-03-23

Family

ID=9388934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403611A Expired - Lifetime EP0434531B1 (fr) 1989-12-22 1990-12-14 Dispositif pour faire effectuer automatiquement un aller-retour à un vérin double effet hydraulique

Country Status (6)

Country Link
EP (1) EP0434531B1 (enrdf_load_stackoverflow)
DE (1) DE69007598T2 (enrdf_load_stackoverflow)
ES (1) ES2050408T3 (enrdf_load_stackoverflow)
FI (1) FI94708C (enrdf_load_stackoverflow)
FR (1) FR2656385B1 (enrdf_load_stackoverflow)
NO (1) NO177651B (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720123B1 (fr) * 1994-05-19 1996-08-14 France Power Packer Sa Automatisme de commande hydraulique, notamment pour charrue.
NL1000971C2 (nl) 1995-08-11 1997-02-12 Applied Power Inc Ploegwentelinrichting.
WO1998012406A1 (en) * 1996-09-20 1998-03-26 Trearc Ltd. Fluid actuators
NL1013077C2 (nl) 1999-09-17 2001-03-20 Applied Power Inc Kleppensamenstel, in het bijzonder voor een hydraulische ploegwentelinrichting.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722262A (en) * 1983-05-21 1988-02-02 Massey-Ferguson Services N.V. Fluid pressure system and value therefor
FR2548288B1 (fr) * 1983-06-29 1985-12-13 Applied Power Inc Dispositif permettant l'inversion automatique de l'alimentation d'un verin double effet hydraulique a partir d'une commande a simple ou double effet
DE3611710C1 (en) * 1986-04-08 1987-07-30 Integral Hydraulik Co Reversing device
FR2643423B1 (fr) * 1989-02-22 1991-05-10 Forhydro Ets Automatisme hydraulique

Also Published As

Publication number Publication date
EP0434531A1 (fr) 1991-06-26
FI906069L (fi) 1991-06-23
NO177651B (no) 1995-07-17
NO905566L (no) 1991-06-24
FI906069A0 (fi) 1990-12-10
NO905566D0 (no) 1990-12-21
ES2050408T3 (es) 1994-05-16
FI94708C (fi) 1995-10-25
FR2656385A1 (enrdf_load_stackoverflow) 1991-06-28
FR2656385B1 (enrdf_load_stackoverflow) 1992-04-30
DE69007598T2 (de) 1994-07-14
DE69007598D1 (de) 1994-04-28
FI94708B (fi) 1995-07-14

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