EP2676036B1 - Système d'entraînement hydraulique sans accumulateur de pression pour un consommateur et comprenant un consommateur, en particulier pour des presses, et procédé permettant de faire fonctionner un tel système d'entraînement hydraulique sans accumulateur de pression - Google Patents

Système d'entraînement hydraulique sans accumulateur de pression pour un consommateur et comprenant un consommateur, en particulier pour des presses, et procédé permettant de faire fonctionner un tel système d'entraînement hydraulique sans accumulateur de pression Download PDF

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Publication number
EP2676036B1
EP2676036B1 EP12709506.5A EP12709506A EP2676036B1 EP 2676036 B1 EP2676036 B1 EP 2676036B1 EP 12709506 A EP12709506 A EP 12709506A EP 2676036 B1 EP2676036 B1 EP 2676036B1
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European Patent Office
Prior art keywords
piston
pump
space
pressure
speed
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EP12709506.5A
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German (de)
English (en)
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EP2676036A1 (fr
Inventor
Manfred Mitze
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MAE Maschinen und Apparatebau Goetzen GmbH
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MAE Maschinen und Apparatebau Goetzen GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
    • B30B1/34—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure involving a plurality of plungers acting on the platen
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers

Definitions

  • the invention relates to an accumulatorless hydraulic drive arrangement for and with a consumer, in particular for presses with the features of the preamble of claim 1 and a method for operating such accumulatorless hydraulic drive assembly with the features of the preamble of claim 17.
  • the invention of a pressure accumulatorless hydraulic drive assembly with working piston, additional rapid traction piston and ring-like return piston, especially when the accumulatorless hydraulic drive assembly for and with a consumer, in particular for pressing, a double-acting, a working piston, a piston rod and a cylinder chamber comprising piston / cylinder unit, in the the reversibly movable working piston, the cylinder chamber on the one hand in a first piston chamber and a second piston chamber complementing the first piston chamber and on the other hand, in an annular space surrounding the piston rod divided.
  • a first pressure line supplies the first piston space
  • a second pressure line supplies the second piston space
  • a third pressure line supplies the annular space with pressure medium which is conveyed by at least one variable-speed and
  • Variable speed hydraulic drives for large cylinders are roughly equivalent to WO 2010/020427 executed.
  • the hydraulic cylinder may be equipped with an additional rapid traverse piston chamber.
  • the first pump first conveys exclusively in the relatively small-area rapid traverse cylinder.
  • the working piston is filled with pressureless hydraulic oil through an open filling valve. To build up a significant pressing force, the filling valve is closed. By actuating a switching valve, the large piston chamber is now also connected to the first pump. Thus, a high power can be generated at low speed. Plants according to this circuit concept have been implemented many times and prove themselves in practice.
  • the disadvantage is the high construction costs for the two motor pump stations. Especially with large consumers, the inverter controls and power supplies used for the motor drive are quite expensive.
  • the object of the invention is to develop the aforementioned variable-speed drive so that only a single electric motor and the corresponding also only a single inverter is required. Another goal is to reduce the number of switchable valves to reduce construction and maintenance costs.
  • a réelle explicatiose hydraulic drive assembly for and with a consumer, in particular for presses with the features of claim 1 and a method having the features of claim 17 is proposed.
  • the invention is based on the WO2010 / 020427 to provide on the concept, in a pressure accumulatorless hydraulic drive assembly with working piston, additional rapid traverse piston and ringlike remindholkolben a Drehiquessvariable pump assembly of a variable speed motor with at least two pumps and the three cylinder (or piston) spaces via three pressure lines individually and directly with the pump to connect such that in both directions a rapid traverse takes place.
  • the WO 2008/082463 A1 discloses a pressure accumulator-free hydraulic drive assembly for and with a consumer, in particular for pressing, with a double-acting, at least one reversibly movable piston, at least one reversibly movable rapid traverse piston, at least one piston rod and at least one cylinder chamber comprising piston / cylinder unit, wherein the at least one cylinder chamber or the cylinder chambers comprise at least one first piston chamber, which acts on the working piston with fluid pressure, at least one second piston chamber which supplements the first piston chamber, and which comprises / surround the rapid traverse piston with fluid pressure, and at least one annular space surrounding the piston rod, with the piston chambers with a pressure medium supplying pressure lines, with a pump assembly which comprises at least two speed and Drehraumsvariabel driven pumps and at least one with the piston / cylinder unit and the pump assembly hydraul Isch connected or connectable pressure medium tank.
  • a pressure accumulator-free hydraulic drive arrangement that at least one pump assembly, a first variable speed and / or rotationally variable driven pump and a second speed and / or direction variable variable driven pump and both pumps together driving speed and / or direction variable drive includes.
  • the pressure medium can be stored substantially without pressure.
  • the first pump is connected via a first pressure line to the first piston chamber or connectable.
  • the second pump is connected on the one hand via a second pressure line to the second piston chamber and on the other hand via the third pressure line to the annular space or connectable.
  • the common drive can be an electric motor. This could u.
  • A. be a (permanent-field) servomotor as well as a standard asynchronous motor with a corresponding 4-quadrant inverter.
  • the first pump and / or the second pump preferably has an adjustable delivery volume in favor of a variable operation, in particular if an external adjusting device is provided, which can respond to hydraulic or electrical control variables of an external control, such as in an inverter.
  • the first piston chamber can be connected to the tank via a supply line having a filling valve or can be connected in order to accelerate the filling of the working cylinder with working fluid in a rapid traverse phase.
  • the first pump assembly corresponding further pump assembly which act in parallel to the piston / cylinder unit in the same direction with the first pump assembly, thereby particularly large-volume piston / cylinder units can be operated.
  • first, the second and / or the third pressure line switching valve-free, in particular free of safety-related switching valves is operable or, thereby u.
  • A. Prevents or reduces impacts in the hydraulic system.
  • the pump arrangement comprises a third pump which can be driven in a variable speed and / or direction of rotation, which is drivable together with the other two pumps by the common drive, the three pressure lines being assigned to each of the three pumps, thereby controlling the piston / cylinder unit, simplified.
  • a first piston in particular the working piston, is effective on one side and at least one, preferably double effective piston / cylinder unit, if desired, by a double-acting piston / cylinder auxiliary unit in rapid traverse forward and réellebewegbar and at least one of the piston chambers, in particular the second piston chamber and the annulus in the at least one double effective piston / cylinder unit or auxiliary unit are provided, characterized z.
  • the at least one converter is connected or connectable to a pressure sensor associated with the working piston and / or to a displacement encoder associated with the working piston, and the at least one converter has a comparatively high safety level, in particular category 3 according to the guideline DIN EN 954-1 or Performance Level d in accordance with ISO 13849.
  • Highest safety requirements eg category 4 according to guideline DIN EN 954-1 or performance level e according to ISO 13849
  • the accumulatorless hydraulic drive assembly for a consumer, in particular for presses is operated in one embodiment such that in a double-acting, a piston, a piston rod and a cylinder chamber comprehensive piston / cylinder unit of the working piston, the cylinder chamber on the one hand into a first piston chamber and dividing a second piston chamber, which supplements the first piston chamber, and the annular piston chamber, by reversing the first piston chamber via a first pressure line, the second piston chamber via a second pressure line and the annular space via a third pressure line with a pressure medium in that a first and a second pump which can be driven in variable speed and / or direction of rotation are driven jointly by a drive which is variable in speed and / or direction of rotation, that the pressure means in one with the at least one piston / cylinder unit and the pump penanssen hydraulically connected or connectable tank is stored, that the second pump in a first rotational direction of the common drive a working fluid under extension of the piston rod at rapid traverse via the second pressure line in the second piston chamber
  • FIGS. 1A, 1B is a double-acting, a piston 21, a piston rod 22 and a cylinder chamber comprising piston / cylinder unit 20 can be seen, in the reversibly movable piston 21, the cylinder chamber on the one hand in a first piston chamber 23A (or working cylinder) and a first piston chamber a so-called rapid traction piston 21A receiving second piston chamber 23B (or rapid traverse cylinder) and on the other hand in a piston rod 22 surrounding annular space 23C (or remindholzylinder ).
  • the rapid traction piston 21A may be oriented in a direction opposite to the piston rod, as shown, or (not shown) in a direction similar to the piston rod.
  • the piston / cylinder unit 20 is connected to a first pressure line D1 supplying the first piston chamber 23A with a pressure medium, a second pressure line D2 supplying pressure fluid to the second piston chamber 23B, and a third pressure line D3 supplying the annular space 23C with pressure medium.
  • a single, designed as a servomotor drive 33 drives a double pump in the form of two, in particular variable speed pumps 31, 32 on a single drive shaft 33A.
  • Both pumps are preferably equipped with a device for adjusting their delivery volume.
  • the adjustment can be done purely by pumping means by a control device that changes the flow rate, for example, the current pressure following. Pumps with adjusting devices of this type are available on the market.
  • an adjusting device 39A, 39B, 39C are used, which can respond to hydraulic or electrical control variables of an external control, such as in an inverter 35.
  • the pump flow rate can be adjusted in proportion to an input signal from "zero" to the maximum flow.
  • Such an adjusting device is produced, for example, by BoschRexroth under the name "HS4" for the axial piston pumps of the A4 series.
  • the servo motor closest to the pump 32 is connected on its one side with the serving as remindholzylinder annular space 23 C and on the other side with the piston space 23 B serving as a rapid traverse cylinder. Both piston surfaces F3 and F2 are approximately equal.
  • the (first) pump 31 is on its one side with a tank 40, on the other side with the cylinder serving as a working piston chamber 23 A fluidly connected.
  • the piston chamber 23A is equipped with a filling valve 34 to fill the piston chamber automatically very quickly when it increases.
  • the displacement sensor 36 installed on the piston rod 22 reports the current piston position to a converter 35 supplying the drive 33 with electrical voltage.
  • the drive at least one mechanical transmission for the torque transmission to at least one of the pumps and / or at least one additional pump of the same drive train can be advantageously assigned, in particular to use motors with relatively higher speeds compared to the pump can , It is also helpful if the pump arrangement comprises a brake, in particular in order to favor a switching valveless operation.
  • the at least one inverter 35 may be connected to a working piston 21 associated pressure sensor and / or a working piston 21 encoder 36 or connect bar and / or have a relatively high level of security, especially category 3 according to the directive DIN EN 954-1 or Performance Level d in accordance with ISO 13849. Combination with other elements, such as a brake included in the pump arrangement, also requires the highest safety requirements (eg Category 4 according to the guideline DIN EN 954-1 or Performance Level e according to ISO 13849) reachable.
  • the (second) pump 32 oil in the piston chamber 23B of the relatively small-area rapid traverse piston 21 A.
  • the pump sucks oil from the annular space 23C.
  • the filling valve 34 is open so that the oil flow required to fill the piston chamber 23A serving as the working cylinder can be sucked from the tank 40.
  • the first Pump 31 is z. B. by the common shaft 33 A to the pump 32 by the servo motor M at the same speed as the pump 32 driven.
  • the delivery flow is preferably set to the maximum via the adjusting device of each pump, so that the pump delivery flow supplements that through the filling valve. This happens at comparatively low pump pressure.
  • the filling valve 34 for example, closed from a certain pressure, the pump 31 fills the large (first) piston chamber 23A now alone.
  • the delivery volume of the pump 32 is thereby withdrawn, optionally pressure-dependent or with the aid of an active, preferably via the inverter 35 controlled adjustment to a predetermined value, approximately corresponding to the area ratio of the two piston surfaces F1 and F2. For example, if F1 is ten times greater than F2, the flow rate is reduced to about 1/10 of the volume flow delivered during rapid traverse.
  • the positioning is done in the usual way by stopping the servomotor M.
  • the reversed pump 32 now promotes in the (lower) annular space 23 C of the piston / cylinder unit 20, so that the piston rod 22 retracts at rapid traverse speed.
  • the pump sucks the oil 32 from the Eilgangkolbenraum 23B.
  • the pump 31 is preferably operated at full flow to assist the possibly switchable Greverntil when emptying the cylinder.
  • FIG. 2A shows an example of a double module.
  • FIG. 3 shows the use of a triple pump.
  • the three pumps 31, 32, 43 are driven together by the drive 33 via the common drive shaft 33A and are connected on the one hand to the tank 40 and on the other hand to one of the pressure lines D1, D2 and D3 respectively and thus supply the first and second piston chambers 23A separately , 23B and the annular space 23C in the same operating sense as above FIGS. 1 to 3 described.
  • This allows more flexibility in the press design. Also increases the number of usable pumps, because versions can be used that can not build pressure on both ports.
  • the piston surfaces F2 and F3 can then be quite different from each other.
  • the working piston 21 is effective on one side and at least one (in the drawing two) double-acting piston / cylinder auxiliary units 24A, 24B via a bridge member 25 in rapid traverse forward and réellebewegbar.
  • the second piston space 23B and the annular space 23C are provided in the double-acting piston / cylinder auxiliary units 24A, 24B.
  • the working piston 21 is effective on one side and by at least one (in the drawing two) double-acting piston / cylinder auxiliary units 24A, 24B via a bridge member 25th in rapid traverse forward and réellebewegbar.
  • the displacer 21 B after Figure 4 is after Fig. 5 provided in the second piston chamber only an opening for substantially unpressurized subsequent flow of fluid, when the trailer for the rapid traverse load is correspondingly large.
  • the same goal can in the embodiments according to Fig. 1A to 3 be achieved when the displacer 21 B are replaced by such openings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (20)

  1. Système d'entraînement hydraulique sans accumulateur de pression (10) pour un consommateur et qui comprend un consommateur, en particulier pour des presses,
    comprenant une unité piston/cylindre (20) à double action comprenant au moins un piston de travail (21) pouvant fonctionner en marche inverse, au moins un piston à marche rapide (21A) pouvant fonctionner en marche inverse, au moins une tige de piston (22, 22A, 22B) et au moins un espace de cylindre, sachant que l'au moins un espace de cylindre ou les espaces de cylindre comprend/comprennent un premier espace de piston (23A) alimentant le piston de travail (21) en pression fluidique, au moins un second espace de piston (23B) complétant le premier espace de piston (23A), alimentant le piston à marche rapide (21A) en pression fluidique et au moins un espace annulaire (23C) entourant une des tiges de piston (22, 22A, 22B),
    comprenant des conduites en pression (D1, ...) alimentant les espaces de piston en fluide de pression,
    comprenant un agencement de pompes (30 ; 30A, 30B) qui comprend au moins deux pompes entraînées avec un régime et un sens de rotation variable et
    comprenant au moins un réservoir de fluide de pression (40) relié ou pouvant être relié hydrauliquement à l'unité piston/cylindre (20 ; 20A, 20B, 20C) et à l'agencement de pompes (30 ; 30A, 30B),
    caractérisé en ce
    qu'un ou plusieurs agencements de pompes (30 ; 30A, 30B) comprend/comprennent respectivement au moins une première et une deuxième pompe (31, 32) et le cas échéant au moins une pompe supplémentaire (43), et un entraînement (33) à régime variable entraînant conjointement les deux ou plusieurs pompes (31, 32, 43),
    la première pompe (31) est reliée ou peut être reliée à un seul espace de piston (23A) de préférence, à savoir le premier, par une première conduite en pression (D1),
    la deuxième pompe (32) est reliée ou peut être reliée à un seul espace de piston (23B) de préférence, à savoir le complémentaire (second), par une deuxième conduite en pression (D2),
    la deuxième (32) ou une troisième (43) pompe est reliée ou peut être reliée à un seul espace annulaire de préférence, à savoir l'espace annulaire (23C), par une troisième conduite en pression (D3) traversée de façon opposée par rapport à la deuxième conduite en pression (D2), de telle sorte que le système d'entraînement hydraulique (10) est exploitable en marche rapide ainsi que dans les deux sens de déplacement et atteint également des pressions de travail élevées en service au moyen d'une chaîne cinématique unique à un seul moteur.
  2. Agencement selon la revendication 1, caractérisé en ce que l'au moins un piston de travail (21) est à double action et divise l'espace de cylindre en le premier espace de piston (23A) d'une part et en l'espace annulaire (23C) entourant la tige de piston (22) d'autre part.
  3. Agencement selon la revendication 1 ou 2, caractérisé en ce que le second espace de piston (23B) complétant le premier espace de piston (23A) est placé face à l'espace annulaire (23C) par rapport au piston de travail (21).
  4. Agencement selon l'une des revendications 1 à 3, caractérisé en ce que l'unité piston/cylindre (20) à double action comprend au moins deux sous-unités (20A, 20B, 20C) hydrauliques coopérant entre elles par un élément de pont (25) et disposées en suspension, desquelles au moins une comprend l'au moins un piston de travail (21) pouvant fonctionner en marche inverse et au moins une autre comprend l'au moins un piston à marche rapide (21A) pouvant fonctionner en marche inverse.
  5. Agencement selon l'une des revendications 1 à 4, caractérisé en ce que l'au moins un piston de travail (21) et/ou l'au moins un piston à marche rapide (21A) portent un piston volumétrique (21B) formant un espace annulaire et cet espace annulaire sert de premier ou de second espace de piston (23A ou 23B).
  6. Agencement selon la revendication 4 ou 5, caractérisé en ce que l'au moins une sous-unité hydraulique (20A, 20B) présentant un piston à marche rapide (21A) pouvant fonctionner en marche inverse est conçue pour être à double action.
  7. Agencement selon la revendication 4, dans lequel l'au moins une sous-unité hydraulique (20A, 20B) présentant un piston à marche rapide (21A) pouvant fonctionner en marche inverse est conçue pour être à double action, caractérisé en ce que l'espace annulaire (23C) est disposé sur la face inférieure du piston à marche rapide (21A) et l'action pour la marche vers le bas de l'unité piston/cylindre (20) à double action, est obtenue par le remplacement de l'espace de piston complémentaire par une ouverture non contrainte par le fluide de pression.
  8. Agencement selon l'une des revendications 4 à 7, caractérisé en ce que l'espace annulaire (23C) est disposé sur la sous-face du piston à marche rapide (21A).
  9. Agencement selon l'une des revendications 4 à 6 ou 8, caractérisé en ce que le (second) espace de piston (23B) complémentaire est disposé sur la face supérieure du piston à marche rapide (21A).
  10. Agencement selon l'une des revendications 1 à 9, caractérisé en ce que la première pompe (31) et/ou la deuxième pompe (32) et/ou une pompe supplémentaire de la même chaîne cinématique présente(nt) un volume refoulé réglable, en particulier lorsqu'un dispositif de réglage externe (39A, 39B, 39C) est prévu, qui peut réagir à des grandeurs de réglage hydrauliques ou électriques d'une commande externe, comme dans un convertisseur (35).
  11. Agencement selon l'une des revendications 1 à 10, caractérisé en ce que le premier espace de piston (23A) est relié ou peut être relié à un réservoir, en particulier au réservoir (40), par une conduite d'arrivée présentant une soupape de remplissage (34), sachant que le cas échéant, la soupape de remplissage (34) remplace le second espace de piston complémentaire et la deuxième conduite en pression (D2).
  12. Agencement selon l'une des revendications 1 à 11, caractérisé en ce que l'au moins un dispositif de commande conçu en tant que convertisseur (35) est prévu pour commander l'entraînement (33) et/ou les volumes refoulés de la première et/ou de la deuxième pompe (31, 32) et/ou au moins une pompe supplémentaire de la même chaîne cinématique et/ou de la soupape de remplissage (34).
  13. Agencement selon la revendication 12, caractérisé en ce que l'au moins un convertisseur (35) est relié ou peut être relié à un capteur de pression attribué à l'au moins un piston de travail (21) et/ou un indicateur de déplacement (36) attribué à l'au moins un piston de travail (21), et l'au moins un convertisseur (35) présente un niveau de sécurité élevé comparable, en particulier de la catégorie 3 conformément à la norme DIN EN 954-1, respectivement le niveau de performance d conformément à la norme ISO 13849.
  14. Agencement selon l'une des revendications 1 à 13, caractérisé en ce qu'au moins un engrenage mécanique (37) est attribué à l'entraînement (33) pour la transmission du couple de rotation à au moins une des pompes (31, 32) et/ou au moins une pompe supplémentaire de la même chaîne cinématique.
  15. Agencement selon l'une des revendications 1 à 14, caractérisé en ce que l'agencement de pompes (30) comprend un frein (38).
  16. Agencement selon l'une des revendications 1 à 15, caractérisé en ce que l'au moins un piston de travail (21) est actif d'un côté et peut être avancé et reculé en marche rapide par au moins une unité piston/cylindre auxiliaire (24A, 24B, ...) fonctionnant seule ou en double, et au moins l'espace annulaire (23C) est prévu dans l'au moins une unité piston/cylindre auxiliaire (24A, 24B, ...).
  17. Procédé permettant de faire fonctionner un système d'entraînement hydraulique sans accumulateur de pression (10) pour un consommateur, en particulier pour des presses,
    dans lequel le piston de travail fonctionne en marche inverse dans au moins une unité piston/cylindre (20) à double action comprenant au moins un piston de travail (21) mobile, au moins un piston à marche rapide (21A) pouvant fonctionner en marche inverse, au moins une tige de piston (22, 22A, 22B) et au moins un espace de cylindre,
    dans lequel l'au moins un espace de cylindre ou les espaces de cylindre comprend/comprennent un premier espace de piston (23A) recevant l'au moins un piston de travail (21), au moins un second espace de piston (23B) complétant le premier espace de piston (23A) et au moins un espace annulaire (23C) entourant une des tiges de piston (22, 22A, 22B) qui sont alimenté(s) en pression fluidique par des conduites sous pression (D1, ...),
    dans lequel le fluide de pression est alimenté dans un réservoir (40) relié ou pouvant être relié hydrauliquement à l'au moins une unité piston/cylindre (20) et l'agencement de pompes (30),
    caractérisé en ce
    qu'au moins une première et une deuxième pompe (31, 32) et le cas échéant au moins une pompe supplémentaire (43) sont entraînées conjointement par un entraînement (33) à régime variable,
    la première pompe (31) alimente en fluide de pression un seul espace de piston (23A) de préférence, à savoir le premier, par une première conduite en pression (D1), la deuxième pompe (32) alimente en fluide de pression un seul espace de piston (23B) de préférence, à savoir le complémentaire (second), par une deuxième conduite en pression (D2), et la deuxième (32) ou troisième (43) pompe alimente en fluide de pression, un seul de préférence, à savoir l'espace annulaire (23C), par une troisième conduite en pression (D3) traversée de façon opposée par rapport à la deuxième conduite en pression (D2), de telle sorte que l'agencement d'entraînement hydraulique (10) est exploitable dans les deux sens de déplacement et atteint également des pressions de travail élevées en service au moyen d'une chaîne cinématique unique à un seul moteur.
  18. Procédé selon la revendication 17, caractérisé en ce que la deuxième pompe (32), dans un premier sens de rotation de l'entraînement (33) commun, pompe le fluide de travail dans le second espace de piston (23B) via la deuxième conduite en pression (D2) du fait de la sortie de la tige de piston (22, 22A, 22B) ou de l'au moins un piston de travail (21) en marche rapide, et la deuxième pompe (32) ou au moins une pompe supplémentaire (43) aspire hors de l'espace annulaire (23C) via la troisième conduite en pression (D3) et la première pompe (31) remplit du fluide de travail dans le premier espace de piston (23A) via la première conduite en pression (D1) et
    dans lequel la deuxième pompe (32) ou l'au moins une pompe supplémentaire (43), dans un second sens de rotation de l'entraînement (33) commun, par la récupération de la tige de piston (22) ou de l'au moins un espace de travail (21) en marche rapide, aspire le fluide de travail hors du deuxième espace de piston (23B) et le pompe dans l'espace annulaire (23C) pendant que du fluide de travail retourne du premier espace de piston (23A) à l'intérieur du réservoir (40).
  19. Procédé selon la revendication 17 ou 18, caractérisé en ce que lors d'un recul, le premier espace de piston (23A) est relié à un réservoir, en particulier au réservoir (40) par une conduite d'amenée présentant une soupape de remplissage (34), de telle sorte que l'au moins un piston de travail (21) en marche rapide s'abaisse, en particulier complètement ou partiellement par gravité également, sachant que le cas échéant, la soupape de remplissage (34) reliée au réservoir remplace le second espace de piston complémentaire et la deuxième conduite sous pression (D2).
  20. Procédé selon l'une des revendications 17 à 19, caractérisé en ce qu'au moins une des conduites sous pression (D1, D2, D3) n'a pas de soupape de commutation, peut être exploitée en particulier à des pressions de fluide de pression supérieures à 300 bar et en particulier de préférence entre 300 et 450 bar ou plus.
EP12709506.5A 2011-02-18 2012-02-20 Système d'entraînement hydraulique sans accumulateur de pression pour un consommateur et comprenant un consommateur, en particulier pour des presses, et procédé permettant de faire fonctionner un tel système d'entraînement hydraulique sans accumulateur de pression Active EP2676036B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110011750 DE102011011750A1 (de) 2011-02-18 2011-02-18 Druckspeicherlose hydraulische Antriebsanordnung für und mit einem Verbraucher, insbesondere für Pressen sowie Verfahren zum Betreiben einer solchen druckspeicherlosen hydraulischen Antriebsanordnung
PCT/EP2012/000735 WO2012110259A1 (fr) 2011-02-18 2012-02-20 Système d'entraînement hydraulique sans accumulateur de pression pour un consommateur et comprenant un consommateur, en particulier pour des presses, et procédé permettant de faire fonctionner un tel système d'entraînement hydraulique sans accumulateur de pression

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EP2676036A1 EP2676036A1 (fr) 2013-12-25
EP2676036B1 true EP2676036B1 (fr) 2014-12-10

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DE102011011750A1 (de) 2012-08-23
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