EP3078456B1 - Entraînement hydraulique - Google Patents

Entraînement hydraulique Download PDF

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Publication number
EP3078456B1
EP3078456B1 EP15163170.2A EP15163170A EP3078456B1 EP 3078456 B1 EP3078456 B1 EP 3078456B1 EP 15163170 A EP15163170 A EP 15163170A EP 3078456 B1 EP3078456 B1 EP 3078456B1
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EP
European Patent Office
Prior art keywords
valve
piston
return
pressure
tool
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.)
Active
Application number
EP15163170.2A
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German (de)
English (en)
Other versions
EP3078456A1 (fr
Inventor
Georg Jemüller
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.)
Hawe Hydraulik SE
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Hawe Hydraulik SE
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Publication date
Application filed by Hawe Hydraulik SE filed Critical Hawe Hydraulik SE
Priority to EP15163170.2A priority Critical patent/EP3078456B1/fr
Publication of EP3078456A1 publication Critical patent/EP3078456A1/fr
Application granted granted Critical
Publication of EP3078456B1 publication Critical patent/EP3078456B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • 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
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet valves
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/30—Directional control
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/67—Methods for controlling pilot pressure
    • 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
    • F15B2211/7052—Single-acting output members
    • 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
    • F15B2211/765—Control of position or angle of the output member
    • F15B2211/7653—Control of position or angle of the output member at distinct positions, e.g. at the end position
    • 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
    • F15B2211/77—Control of direction of movement of the output member
    • F15B2211/7716—Control of direction of movement of the output member with automatic return

Definitions

  • the invention relates to a hydraulic drive according to the preamble of claim 1.
  • the tool piston can be stopped at the return in the open position of the changeover valve at any position characterized in that the previously switched off with response of the pressure relief valve pump is turned on again and generates a pressure pulse.
  • the switching valve includes an annular space in which the transmission piston in the closing direction of the valve plug can be acted upon by the pressure pulse to overcome a latching contained in the switching valve, the valve cone in the open position locking and set the switching valve in the locked position.
  • the return of the tool piston can not be stopped by utilizing the mechanical actuation of the pressure relief valve.
  • there are users who do not see the stopping of the return stroke of the tool piston by turning on the pump as appropriate, but want to stop the tool piston by mechanical actuation of the pressure relief valve.
  • the invention is based on the object to provide a hydraulic drive of the type mentioned, in which the return of the tool piston can be stopped by a mechanical actuation of the pressure relief valve, as well as by mechanical actuation of the pressure relief valve in the shut-off adjustable switching valve is structurally simple, reliable and inexpensive.
  • the return of the tool piston can be stopped at any desired position within the entire return stroke by a mechanical actuation of the pressure limiting valve. Because the valve cone, during the return of the tool piston in the open position, and z. B. is maintained in the open position by effective between the outlet of the then closed pressure relief valve and the pressure port of the transmission piston residual pressure, after mechanical opening of the pressure relief valve under the action of its closing spring is automatically in the shut-off, whereby the tool piston is stopped.
  • the switching valve is structurally simple, reliable and cost-effective, among other things because it requires no latching and no additional, can be acted upon by the pump pressure annular chamber to overcome the latching.
  • the check valve a displaceably guided in the translation piston, expedient spring-loaded, closing body, and a molded in the transmission piston seat for the closing body.
  • the closing body can be lifted off the seat either by a pressure difference resulting in the function of the reversing valve, or / and by the valve cone, which is adjustably arranged relative to the transmission piston, and its closing spring. It is expedient if the closing spring of the closing body is weaker than the closing spring of the valve cone.
  • valve cone by mechanical actuation of the pressure relief valve, preferably concurrently with a change of the check valve in its open position, thereby brought into the shut-off that the valve plug through the closing spring assisted by the flow dynamics of the ejected from the working space pressure medium automatically comes into the shut-off position on the seat.
  • valve cone within an end portion of the return of the tool piston from the tool piston itself, preferably by direct mechanical contact, in the shut-off position on the seat and simultaneously or lagging the check valve from the valve cone are brought into the open position. Because the tool piston can strike the valve cone with considerable speed and force. If residual pressure on the transmission piston then still acts on the pressure connection, then this residual pressure could not be reduced quickly enough via the then blocked outlet of the pressure limiting valve and generate high mechanical loads in the switching valve. However, since the poppet unlocks the check valve under the influence of the tool piston, remaining residual pressure on the transmission piston can still be released directly to the return line and mechanical stresses between moving components of the changeover valve are minimized.
  • the closing spring of the closing body if provided at all, is expediently supported in a stop provided in the discharge piston in the transmission piston in such a way that the outflow path is not hindered thereby.
  • Structurally simple is the stop a arranged in the translation piston cross pin.
  • Fig. 1 schematically illustrates a hydraulic tool W, which is used for example for pressing cable lugs.
  • the tool W is expediently a hand tool which can either be connected to the network via a cable or has a rechargeable battery or power pack for a pump P which can be operated electrically in the disconnection mode.
  • a pressure line branch 3 leads to the pressure relief valve D, from whose spring chamber a return channel 5 leads to a return line 4 (tank T) connected to the changeover valve U.
  • An outlet 6 of the pressure limiting valve D is connected to a pressure port 7 of a large-diameter transmission piston 22 of the switching valve U.
  • a piston 8 is slidably guided, which has a central extension 9 which cooperates with a central bore 10 in which the pressure of the pressure line 2, 3 acts on the extension 9.
  • the piston 8 has a relative to the extension 9 much larger piston plate 11, which is loaded by a control spring 12.
  • a shaft 13 of the piston 8 extends sealed to the outside from the pressure relief valve D and has a mechanical actuator 14, can be attacked for example, to open the pressure relief valve D by hand or a corresponding translation.
  • the switching valve U which is expediently designed as a valve cartridge, preferably screw-in cartridge, has a housing 15 which has a return channel 16 connected to the return 4 and a seat 17 for a valve cone 18.
  • the valve cone 18 is acted upon by a closing spring 19 in the closing direction to the seat 17 and is, preferably sealed with a seal 20, slidably guided in a bore 21 of the transmission piston 22.
  • the translation piston 22 is in turn in a bore 23 of the housing 15 with slidably guided a slide fitting.
  • the slider fit can range between a few hundredths and one or two tenths of a millimeter.
  • a seat 24 for a sealing surface 25 of a closing body 26 of a check valve V is formed in the transmission piston 22.
  • the closing body 26 is acted upon by a closing spring 27 in the closing direction to the seat 24.
  • the closing spring 27 is supported on a stop 28 in the transmission piston 22.
  • the stop 28 is for example a transverse pin in a passage of the transmission piston 22.
  • the closing body 26 may have at least one lateral flattening 29 to open pressure medium then the way into the passage when the sealing surface 25 is lifted from the seat 24.
  • an extension 31, and following the seat 24, a further extension 30 in the transmission piston 22 are provided.
  • the extensions 31, 30 together define a Abströmweg in the interior of the transmission piston 22, which Abströmweg leads via connecting holes 32 to the return passage 16 and thus to the return 4.
  • Der rublaufkanal 16 ist in der Auslrawötechnisch 32 anesthesia.
  • the hydraulic drive H is shown during the return of the tool piston K.
  • the reversing valve U is in the open position with the valve 17 lifted off the seat 17.
  • the check valve V is in its shut-off position.
  • the pressure limiting valve D is in its shut-off position.
  • the pump P is not in operation.
  • FIG. 1 and 2 an operating situation is shown in which the tool piston K is at the return within the entire return stroke and before reaching an end portion of the return stroke.
  • a provided for example on the tool piston K projection 34 is just about to contact the above the seat 17 projecting poppet 18 and to push in the blocking position on the seat 17.
  • the pump P is switched off.
  • the pressure relief valve D is in the shut-off position. Between the outlet 6 of the pressure relief valve D and the pressure port 7 of the transmission piston 22, a residual pressure from earlier fed in response of the pressure relief valve D pressure holds the translation piston 22 with the check valve V closed in the position shown, in which the valve cone 18 from the seat 17th protrudes, ie the switching valve U is in its open position.
  • the pump P is put into operation, so that then closed switching valve U of the working chamber 33 is pressurized and the tool piston K receives its movement against the load 1 until it generates a maximum, preselected tool force.
  • the standing in its shut-off pressure relief valve D receives this pressure via the pressure line 3 on the extension 9 in the bore 10.
  • the control spring 12 is set to the maximum tool pressure. Once the maximum tool pressure is reached, the piston 8 is displaced against the force of the control spring 12, d. h., The pressure relief valve D is brought into its open position or control position.
  • the translation piston 22 does not yield fast enough, as it has a slide bore fit in the bore 23 is guided, or because there is residual pressure at the pressure port 7, then the closing spring 19, the valve cone 18 relative to the translation piston 22 as far down that the check valve V is opened, and the residual pressure on the outflow in the transmission piston 22 to return 4 is reduced.
  • the tool piston In the renewed shut-off position of the switching valve 18, the tool piston is either stopped, or it is again moved to a working position after switching the pump P again until finally the maximum tool pressure is reached again and the pressure relief valve D responds to the changeover valve U in the open position bring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Safety Valves (AREA)

Claims (6)

  1. Entraînement hydraulique (H) avec une pompe (P), un piston d'outil (K) déplaçable contre une charge (1) d'un côté par la pompe (P) fonctionnant de manière intermittente, et avec une soupape de limitation de pression (D) présentant un actionnement mécanique (14) et limitant une pression d'outil maximale du piston d'outil (K), avec également une soupape d'inversion (U) réglable dans des positions de blocage et d'ouverture entre un espace de travail (33), raccordé à la pompe (P), du piston d'outil (K) et un retour (4), dans lequel une sortie (6) de la soupape de limitation de pression (D) est raccordée à un raccord de pression (7) d'un piston de multiplication (22) de la soupape d'inversion (U), lequel comprend un cône de soupape (18) de la soupape d'inversion (U), caractérisé en ce qu'à l'intérieur dans le piston de multiplication (22) de la soupape d'inversion (U) séparée de la soupape de limitation de pression (D) est disposée une trajectoire d'échappement du raccord de pression (7) au retour (4), en ce que le piston de multiplication (22) comprend une soupape de non-retour (V), bloquante dans le sens d'écoulement du raccord de pression (7) au retour (4), avec un corps de fermeture (26), qui présente un siège (24) formé dans le piston de multiplication (22) pour le corps de fermeture (26), dans lequel le corps de fermeture (26) peut être enlevé du siège (24) pour débloquer la soupape de non-retour (V) en fonction de la pression et / ou par le cône de soupape (18) déplacé par rapport au piston de multiplication (22), et en ce que le cône de soupape (18) est chargé dans le sens de fermeture par un ressort de fermeture (19).
  2. Entraînement hydraulique selon la revendication 1, caractérisé en ce que pour l'arrêt éligible du retour du piston d'outil (K) au cours de sa course de retour dans la position d'ouverture de la soupape d'inversion (U), le cône de soupape (18) par actionnement mécanique de la soupape de limitation de pression (D), de préférence avec déplacement de la soupape de retour (V) dans sa position d'ouverture, peut être amené par l'intermédiaire du ressort de fermeture (19) dans la position d'obturation.
  3. Entraînement hydraulique selon la revendication 1, caractérisé en ce que dans la position d'ouverture de la soupape d'inversion (U), le cône de soupape (18) au sein d'une section terminale du retour du piston d'outil (K), peut être amené du piston d'outil (K), de préférence mécaniquement, à la position d'obturation de la soupape d'inversion (U) et la soupape de retour (V) peut être amenée du cône de soupape (18) dans la position d'ouverture.
  4. Entraînement hydraulique selon la revendication 1, caractérisé en ce que le diamètre d'obturation de la soupape de retour (V) est supérieur au diamètre d'obturation du cône de soupape (18).
  5. Entraînement hydraulique selon la revendication 1, caractérisé en ce qu'un ressort de fermeture (27) du corps de fermeture (26) est appuyé sur une butée (28) prévue dans la trajectoire d'échappement dans le piston de multiplication (22).
  6. Entraînement hydraulique selon la revendication 5, caractérisé en ce que la butée (28) est une broche transversale disposée dans le piston de multiplication (22).
EP15163170.2A 2015-04-10 2015-04-10 Entraînement hydraulique Active EP3078456B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15163170.2A EP3078456B1 (fr) 2015-04-10 2015-04-10 Entraînement hydraulique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15163170.2A EP3078456B1 (fr) 2015-04-10 2015-04-10 Entraînement hydraulique

Publications (2)

Publication Number Publication Date
EP3078456A1 EP3078456A1 (fr) 2016-10-12
EP3078456B1 true EP3078456B1 (fr) 2017-12-06

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EP15163170.2A Active EP3078456B1 (fr) 2015-04-10 2015-04-10 Entraînement hydraulique

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19825160A1 (de) * 1997-10-15 1999-04-22 Klauke Gmbh Gustav Hydraulisches Preßgerät und Verfahren zum Betreiben desselben
EP2711560B1 (fr) * 2012-09-21 2019-06-12 HAWE Hydraulik SE Entraînement hydraulique pour un outil pouvant être actionné hydrauliquement
EP2835540B1 (fr) 2013-08-08 2016-04-27 HAWE Hydraulik SE Entraînement hydraulique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

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