EP0962661B1 - Vanne de commutation à pression différentielle avec commutateur électrique - Google Patents

Vanne de commutation à pression différentielle avec commutateur électrique Download PDF

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Publication number
EP0962661B1
EP0962661B1 EP99107503A EP99107503A EP0962661B1 EP 0962661 B1 EP0962661 B1 EP 0962661B1 EP 99107503 A EP99107503 A EP 99107503A EP 99107503 A EP99107503 A EP 99107503A EP 0962661 B1 EP0962661 B1 EP 0962661B1
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EP
European Patent Office
Prior art keywords
piston
pressure
control valve
differential
valve according
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
EP99107503A
Other languages
German (de)
English (en)
Other versions
EP0962661A1 (fr
Inventor
Georg Neumair
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 GmbH and Co KG
Original Assignee
Hawe Hydraulik GmbH and Co KG
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
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Publication of EP0962661A1 publication Critical patent/EP0962661A1/fr
Application granted granted Critical
Publication of EP0962661B1 publication Critical patent/EP0962661B1/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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • 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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out 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
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • 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
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
    • 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
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/57—Control of a differential 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
    • 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
    • F15B2211/76—Control of force or torque of the output member
    • 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 differential pressure switching valve according to the preamble of the claim 1.
  • the signal is e.g. in a Machine tool transmitted to a control device to reach an inside a wide range of consumer pressure set to a certain value (Clamping pressure) to report, so that the control device further processing steps can cause. Because the area of action of the first piston is considerable is larger than the area of action of the second piston can be relatively lower Pilot pressure can be used.
  • the first piston is actuated by the released force of the spring arrangement the electrical switch so that the control device transmits a good signal with which the control device can not do anything.
  • the spring arrangement required to ensure an even switching point in the entire setting range.
  • the invention has for its object a differential pressure switching valve at the beginning to create the type mentioned with improved switching behavior.
  • the counter spring is hydraulically switched off, so that the first and second pistons under the influence of the spring arrangement work correctly.
  • the pilot pressure falls below a certain pressure threshold drops, the counter-piston is no longer able to switch off the counter-spring, which only then overcomes the force of the spring arrangement.
  • the spring arrangement is not more able to operate the electrical switch via the first piston, as long as a certain level of the pilot pressure is not available again. On structurally simple way is thus ensured that in the case of pressure conditions at which no pressure monitoring or pressure message is needed, also no message is delivered.
  • the counter spring is automatically switched off when the Change pressure ratios and pressure monitoring is needed. This is useful around an electronic control device of a machine tool is unnecessary spare confusing signals.
  • the counter spring is expediently hydraulically controlled by the pilot pressure Counter piston switched off. This means that the counter spring automatically takes effect, as soon as the pilot pressure has dropped below a predetermined threshold is.
  • the counter spring with the counter piston is structurally simple in the differential pressure switching valve incorporated.
  • a structural simplification is also achieved if the areas of contact with one another are the same.
  • a correct pressure scan is achieved, however, the displacement resistance of the pistons can be higher.
  • the first piston and the counter-piston can only be slide-tight and thus run smoothly in the housing bore. If necessary with slide tightness Any leakage that occurs will return without any interference.
  • the counter spring is appropriately dimensioned so that it reliably Avoid generation of unwanted messages by the electrical switch.
  • the differential pressure switching valve is particularly useful for a machine tool, where the consumer can be completely relieved of pressure. Then the levy a confusing good signal due to the counter spring avoided.
  • An example would be a pair of sheet metal shears in which hold-down devices can be used to reset a workpiece have to record that is being processed.
  • the differential pressure switching valve reports when the set clamping pressure of the hold-down device is reached, so that the higher one Control device issue the command to machine the clamped workpiece can.
  • the hold-down device is returned to the basic position by its return springs the consumer line is depressurized and the pilot pressure also builds up to return.
  • the counter spring would appear again. Thanks to the counter spring, this message is suppressed.
  • a differential pressure switching valve D has a housing 1 with a longitudinal one Housing hole 2 on. At one end of the housing 1 there is an electrical one Switch S with its housing 3, expediently for setting its Switching point adjustable, arranged such that its actuating element 14 approximately lies in the axis of the housing bore 2 and faces the housing bore.
  • a first piston K1 with a large contact surface A1 is displaceably guided, which is designed as a pot piston and has a driver stop 12 on the inside.
  • a spring arrangement F is contained in the interior, which is located on the stopper 10a supports and via a plunger head 11 of a second coaxial piston K2 first piston K1 in Fig.
  • the second piston K2 the pressure surface A2 is significantly smaller than the area of application A1 a seal 27 and a short guide portion 27 'in the plug 10a and protrudes into a chamber 4, which has a throttle 5 with a reference pressure connection 6 connected is.
  • a channel 7 is provided which the housing bore at the level of the pressure surface A1 of the first piston K1 with a pilot pressure connection 8 connects.
  • channels 9 can be provided in the housing 1 be, which lead to a return port R.
  • the first piston K1 sealed with a seal 29 in the housing bore 2 has a plunger 13 on the actuating element 14 of the electrical Switch S is aligned.
  • the plunger 13 passes through a sealing guide 16 in the stopper 15.
  • Between the plug 15 and the first piston K1 are a counter spring G and a counter piston K3 arranged.
  • the counter piston K3 has e.g. the same Action surface A3 as the first piston K1, contains a seal 17 for the Tappet 13, and is even slidable with a seal 28 in the housing bore 2.
  • the counter-piston K3 transmits the force of the support on the plug 15 Counter spring G on the first piston K1, as long as that in the housing bore 2 between the pilot pressure acting on the application areas A1 and A3 is a predetermined one Pressure threshold does not exceed. If the pilot pressure rises above the pressure threshold, then the application area A3 is sufficient for the counter-piston K3 the counter spring G switches off, it goes to the stop with the plug 15.
  • the the first piston uses K1 for its working cycle movement, which he executes in cooperation with the second piston K2 in order to predetermined relation between the pilot pressure at the pilot pressure connection 8 and the reference pressure at the reference pressure connection 6, the actuating element 14 to operate the electrical switch so that the switch emits a signal.
  • the Pilot pressure is set to regulate a certain consumer pressure the pilot pressure in a pressure control valve for the mentioned control function is used.
  • the reference pressure is derived from the actual consumer pressure, which is above the pressure control valve is activated. Only if the predetermined ratio between the reference pressure and the pilot pressure is reached, the signal should be given become.
  • the force of the counter spring G is greater than the force of the spring arrangement F, namely at least by the displacement resistances of pistons K3, K1, K2 and plunger 13 in the seal 16.
  • a hydraulic control device H in FIG. 2 is used, for example, for motion control a hydraulic clamping device N of a machine tool, for example the hold-down device of tin snips.
  • a hydraulic clamping device N of a machine tool for example the hold-down device of tin snips.
  • the jig N are through Springs resettable, one-sided actionable cylinder 21 in parallel via a consumer line 20 connected to the output of a pressure control valve M, the arranged downstream of a 2/2-way seat valve 18 with magnetic actuation and with a Pump line is connected.
  • the valve 18 is part of a directional control valve, the other part also a 2/2-way seat valve 19 with magnetic actuation in one of the Consumer line 20 to the return line R branching drain line 22 is.
  • the Differential pressure switching valve D is with its reference pressure port 8 to one of the consumer line 20 branching control line 25 and with its pilot pressure connection 6 to a pilot line 24 to the pilot side 23 of the pressure control valve M (for example by a proportional magnet on the respective Consumer pressure level is adjustable) connected.
  • the differential pressure switching valve D With the differential pressure switching valve D are the spring arrangement F, the electrical switch S and the return connection R (for leaks) only indicated symbolically.
  • the valve 19 In order to extend the cylinders 21 against their return springs, the valve 19 is in its Blocked position is adjusted while the valve 18 is adjusted to its open position becomes.
  • Pump line P is unregulated Pressure on, which is higher than that at the pressure control valve M by means of the proportional magnet 26 set pressure. Regardless of changes to the unregulated Pressure in the pump line P is from the pressure control valve M in the cylinders 21st the desired pressure is maintained.
  • the differential pressure switching valve D transmits when reached the set clamping pressure with the electrical switch the signal "Tension pressure reached" to a higher-level control device, not shown Machine tool. This then causes further processing steps, e.g. the actuation the sheet metal shear drives.
  • valve 18 In order to relax the hold-down cylinder 21, the valve 18 is first in its Blocked position switched, and then the valve 19 in its open position.
  • the Consumer line 20 is relieved of pressure.
  • Both the reference pressure in the control line 25 and the pilot pressure in the control line 24 are reduced.
  • the spring arrangement F the electrical again when the pilot pressure drops Actuate switch S and the control device receives a signal "clamping pressure reached" to transfer.
  • the counter spring suppresses this message, the control device correctly informed.

Claims (11)

  1. Vanne de commutation à pression différentielle (D), en particulier pour un dispositif de serrage hydraulique (N) de machine-outil, comportant un premier piston (K1) qui peut être attaqué en sens contraire d'un deuxième piston (K2) coaxial, couplé au premier piston (K1), la surface d'attaque (A1) du premier piston (K1), chargée par une pression pilote générée pour le réglage de la pression de récepteur, étant supérieure à la surface d'attaque (A2) du deuxième piston (K2), chargée par une pression de référence dérivée d'une pression de récepteur, un agencement à ressort (F) qui attaque les deux pistons (K1, K2) dans le sens de charge de la pression de référence, et un commutateur électrique (S) actionnable en fonction de la position du premier piston (K1), caractérisée en ce qu'il est prévu un ressort antagoniste (G) qui attaque au moins le premier piston (K1) avec une force antagoniste surmontant la force de l'agencement à ressort (F), et que le ressort antagoniste (G) est déconnectable hydrauliquement au moyen d'un piston antagoniste (K3).
  2. Vanne de commutation à pression différentielle suivant la revendication 1, caractérisée en ce que le piston antagoniste (K3) peut être amené dans une position déconnectant le ressort antagoniste (G) par la pression pilote chargeant le premier piston (K1).
  3. Vanne de commutation à pression différentielle suivant la revendication 1, caractérisée en ce que le ressort antagoniste (G) est prévu sur le piston antagoniste (K3) dans un alésage de corps (2) contenant le premier piston (K1) et attaque le premier piston (K1) par l'intermédiaire du piston antagoniste (K3).
  4. Vanne de commutation à pression différentielle suivant la revendication 1, caractérisée en ce que la surface d'attaque (A3) du piston antagoniste (K3) correspond à celle du premier piston (K1).
  5. Vanne de commutation à pression différentielle suivant la revendication 3, caractérisée en ce que le premier piston (K1) et le piston antagoniste (K3) sont mobiles et étanchés dans l'alésage de corps (2) par des éléments d'étanchéité (2, 28).
  6. Vanne de commutation à pression différentielle suivant la revendication 1, caractérisé en ce que les côtés arrière du premier piston (K1) et du piston antagoniste (K3), opposés aux surfaces d'attaque (A1, A3), sont déchargés en pression, de préférence vers un retour (R).
  7. Vanne de commutation à pression différentielle suivant l'une au moins des revendications 3 et 6, caractérisée en ce que le premier piston (K1) et le piston antagoniste (K3) ne sont guidés qu'à étanchéité coulissante dans l'alésage de corps (2).
  8. Vanne de commutation à pression différentielle suivant la revendication 1, caractérisée en ce que le premier piston (K1) actionne le commutateur électrique (S) par l'intermédiaire d'un poussoir (13) guidé de façon étanche hors de l'alésage de corps (2), et que le poussoir (13) traverse le piston antagoniste (K3), et de préférence également le ressort antagoniste (G).
  9. Vanne de commutation à pression différentielle suivant la revendication 8, caractérisée en ce qu'un joint (17) pour le poussoir (13) est prévu dans le piston antagoniste (K3).
  10. Vanne de commutation à pression différentielle suivant l'une au moins des revendications précédentes 8 ou 9, caractérisée en ce que la force antagoniste du ressort (G) est supérieure à la force de l'agencement à ressort (F) d'au moins les résistances de déplacement du piston antagoniste (K3) et du premier piston (K1), plus la résistance de déplacement du poussoir (13) dans son guidage étanche (16) d'alésage de corps.
  11. Vanne de commutation à pression différentielle suivant l'une au moins des revendications précédentes, caractérisée en ce que la vanne de commutation à pression différentielle (D) est raccordée en tant qu'indicateur de pression à la conduite de récepteur (20), pouvant être attaquée et déchargée par un distributeur (W), d'un moteur hydraulique (21) du dispositif de serrage (N) d'une machine-outil, le distributeur (W) déchargeant dans sa position de base, en direction du retour (R), la pression dans la conduite de récepteur et la pression pilote d'une vanne pilote de régulation de pression (M), associée au distributeur, et que le commutateur électrique (S) est en liaison de transmission de signaux avec un dispositif de commande prioritaire de la machine-outil.
EP99107503A 1998-06-03 1999-04-14 Vanne de commutation à pression différentielle avec commutateur électrique Expired - Lifetime EP0962661B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29809936U DE29809936U1 (de) 1998-06-03 1998-06-03 Differenzdruck-Schaltventil mit elektrischem Schalter
DE29809936U 1998-06-03

Publications (2)

Publication Number Publication Date
EP0962661A1 EP0962661A1 (fr) 1999-12-08
EP0962661B1 true EP0962661B1 (fr) 2003-12-10

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EP99107503A Expired - Lifetime EP0962661B1 (fr) 1998-06-03 1999-04-14 Vanne de commutation à pression différentielle avec commutateur électrique

Country Status (2)

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EP (1) EP0962661B1 (fr)
DE (2) DE29809936U1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9915309D0 (en) * 1999-06-30 1999-09-01 Lucas Ind Plc Valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8527184U1 (de) 1985-09-24 1986-01-09 Vöhringer, Karl, 7554 Kuppenheim Drucksteuerventil
DE29710128U1 (de) 1997-06-10 1997-08-14 Heilmeier & Weinlein Differenzdruck-Schaltventil

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Publication number Publication date
EP0962661A1 (fr) 1999-12-08
DE59907989D1 (de) 2004-01-22
DE29809936U1 (de) 1998-10-08

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