EP1371859A1 - Dispositif de serrage électrohydraulique - Google Patents

Dispositif de serrage électrohydraulique Download PDF

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Publication number
EP1371859A1
EP1371859A1 EP03006777A EP03006777A EP1371859A1 EP 1371859 A1 EP1371859 A1 EP 1371859A1 EP 03006777 A EP03006777 A EP 03006777A EP 03006777 A EP03006777 A EP 03006777A EP 1371859 A1 EP1371859 A1 EP 1371859A1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
control
clamping
proportional
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.)
Granted
Application number
EP03006777A
Other languages
German (de)
English (en)
Other versions
EP1371859B1 (fr
Inventor
Georg Dipl.-Ing. Neumair (Fh)
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
Application filed by Hawe Hydraulik GmbH and Co KG filed Critical Hawe Hydraulik GmbH and Co KG
Publication of EP1371859A1 publication Critical patent/EP1371859A1/fr
Application granted granted Critical
Publication of EP1371859B1 publication Critical patent/EP1371859B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure
    • 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
    • F15B2211/20538—Type of pump constant 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional 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
    • F15B2211/505—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
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • 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
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid 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
    • F15B2211/50—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • 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
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means

Definitions

  • EP 0 884 486 A DE 201 14 538 U.
  • the invention has for its object an electro-hydraulic clamping device of the type mentioned at the beginning with an increased safety standard, regardless of whether the clamping pressure is electrical or manual is set.
  • the proportional magnet the proportional pressure control valve is only energized again in this control routine, if a change in the clamping pressure (wanted or for readjustment) is required becomes.
  • the safety valve shut off in both directions without leakage is also useful for electrohydraulic clamping devices where the clamping pressure is set manually.
  • the safety valve is expediently a seat valve which is structurally simple and inexpensive and is reliable, and both flow directions are leak-free in the shut-off position blocked. Because the spring load of the closing element for the shut-off position is responsible, a simple black / white switching magnet can be used for the safety valve be used.
  • a compact design with as few components as possible is an important aspect such electro-hydraulic clamping devices.
  • the magnets of the safety valve are also and the proportional pressure control valve combined into a double magnet that common connector.
  • electrohydraulic tensioning device is a superordinate, electronic control and / or To provide monitoring device, preferably an electrical Has adjusting device for the clamping pressure.
  • an analog pressure sensor is expediently provided for tapping the actual clamping pressure, which, preferably, to a tension pressure signal line separate from the main circuit connected.
  • the analog pressure transducer provides in a control loop in which at least the proportional solenoid of the proportional pressure control valve and the switching magnet of the safety valve are included, the actual value of the clamping pressure ready, whereby an automatic control with target and actual value comparison is possible, or at least an alarm can be given if the clamping pressure monitored by the analog pressure sensor may be too low or too high should.
  • the analog pressure sensor continuously provides the necessary information for the control device is available, as opposed to usually only one visual and passive display offering manometer.
  • the analog pressure transducer with a display and / or alarm device is useful and / or the higher-level control and / or monitoring device connected.
  • the control routine after setting the Target pressure the proportional solenoid of the proportional pressure control valve completely to de-energize and leave the safety valve in the shut-off position increased Operational security given.
  • An electrohydraulic tensioning device S according to FIG. 1 is used for adjustment (e.g. Loosening and tightening) of a clamping element 1 and contains one as the main component Hydraulic control 2, which, preferably, a higher-level electronic control and / or Monitoring device 3 is assigned.
  • a signal device 4 can indicate a good or fault condition.
  • An adjusting device 5 is used, for example for electrical adjustment of the clamping pressure.
  • the hydraulic control 2 is in a main circuit 6 (pressure line) by a pump P) supplied.
  • a pressure compensator upstream of a clamping pressure valve V.
  • DW arranged. From a directional control valve W downstream of the clamping pressure valve V lead work lines 27, 26 to the clamping element or the clamping group 1.
  • a Return line 13 leads to a pressure medium reservoir. Downstream of the clamping pressure valve V branches from the main circuit 6, a line 21, for example to a manometer Mab.
  • the pressure compensator DW is determined by the pressure in line 21 and the force of a spring 22 in the closing direction and the main circuit pressure between the pressure compensator DW and the clamping pressure valve V in the opening direction.
  • An electrical switch 8 is assigned to the clamping pressure valve V, for example emits a good signal when the target clamping pressure is reached and to the control device 3 transmitted.
  • the clamping pressure valve V contains one loaded by a control spring 11 Control piston K for adjusting the size of an orifice 7.
  • the clamping pressure determining control spring 10 is arranged by a in a control chamber 9 Adjusting piston 10 acted upon.
  • the safety valve D is countered by a black / white switching magnet 14 the force of a spring 16 from the shut-off position O shown in a through position c adjusted.
  • a shut-off device C is included in the shut-off position 0 there is no leakage in both flow directions, i.e. any Flow from the control chamber 9 to the proportional pressure control valve B and conversely prevented.
  • An analog pressure sensor A is connected to the clamping pressure signal line 12, the (indicated by dashed lines), as well as the other electrically operated components the hydraulic control 2, be connected to the control device 3 can.
  • the analog pressure sensor A reports the actual clamping pressure, which when switched Directional control valve W prevails in one of the working lines 27, 26.
  • the electrical switch 8 gives a signal at a predetermined position of the control piston K, which is matched to the target clamping pressure.
  • the DW pressure compensator holds regardless of pressure fluctuations on the part of the clamping pressure valve V or Pump P the pressure difference at the control piston K constant, so that the electrical Switch 8 signal is strictly quantity-dependent and clear.
  • the clamping element 1 is in its release position. By applying the Working line 27 it is brought into its clamping position in which it has a workpiece should maintain a target clamping pressure.
  • the target clamping pressure is, for example, at Adjustment device 5 set.
  • the safety valve D is activated of the switching magnet 14 from the shut-off position shown in its through position c adjusted.
  • the proportional magnet 15 of the proportional pressure control valve B from the control device 3 with a precisely determined one Current energized with the target clamping pressure or a target pressure in the control chamber 9 corresponds. Pressure is present in the setting pilot circuit, from which the Proportional pressure control valve B in the control chamber 9 the predetermined target pressure established.
  • the directional control valve W is in his Switch position brought in which the main circuit 6 connected to the working line 27 is while the working line 26 is connected to the return line 13. through of the clamping pressure signal in line 12, the control piston K controls the soli clamping pressure exactly a, the reaching of which, for example, by triggering the switch 8 is reported.
  • the switching magnet 14 is de-energized, so that the safety valve D in its shut-off position shown goes before the proportional magnet 15 is de-energized and the setting pilot circuit between the safety valve D and the proportional pressure control valve B to the return line 13 is relieved.
  • Pressure fluctuations in Main circuit 6 caused by the pressure relief valve V, the pump P or leakage in the Clamping element 1 are caused, the pressure compensator DW compensates, so that the Pressure difference at the control piston K is kept constant.
  • the directional control valve W is changed over so that the working line 27 with the return line 13 and the working line 26 with the Main circuit 6 is connected.
  • the controller 2 is explained in detail with reference to FIGS. 2 and 3, with FIG. 3 being a Section in the section plane III-III in Fig. 2 is. It should be emphasized that the pressure compensator DW and / or the analog pressure transducer A is not absolutely necessary, but are convenient options.
  • the linearly displaceable control piston K of the clamping pressure valve V in the middle block is relieved on its side loaded by the adjusting spring 11 to the return line 13, and receives the tension pressure signal on line 12 on the opposite side. It positions itself in a position in which it works through the cooperation of its control edge with a housing edge adjusts the amount for the target clamping pressure via an orifice 7.
  • the control piston operates with the end acted upon by the clamping pressure signal K the electrical switch 8, whose switching point to the position of the control piston K is set, which is the target clamping pressure, or because of a constant pressure difference via the control piston K maintaining pressure compensator DW, a certain one Quantity (flow rate) of the pressure medium through the orifice corresponds.
  • the switching point of the electrical switch 8 is, for example, by inserting or removing of documents 18 precisely adjusted to the aforementioned position of the control piston K.
  • the directional control valve W connects one of the depending on the current supply Magnets 25, 24 the main circuit 6 with one or the other working line 26, 27.
  • the actual clamping pressure prevailing in the respective working line 26 or 27 becomes tapped permanently by the analog pressure transducer A.
  • the middle block is the preload of the actuating spring 11 by the actuating piston 10 by means of the pressure prevailing in the control chamber 9.
  • the safety valve D and the proportional pressure control valve B are expediently side by side in a head part 19 of the control chamber 9 placed.
  • the proportional magnet 15 is included the switching magnet 14 combined to form a double magnet on Headboard 19 is mounted and a common plug connection for both functions Owns 20. This is symbolized by the inscription SW and PROP in Fig. 3.
  • the two magnets can also be designed and assembled separately.
  • the Valves B and D can be installed separately, if necessary with their own blocks.
  • the proportional pressure control valve B is expediently a screw-in valve, which in the Head part 19 in a chamber between a connection bore 28 of the setting precontrol circuit and a channel 29 to another receiving the safety valve D. Chamber sits in the head part 19.
  • the safety valve D is a seat valve (screw-in valve), a closing element 31 with a spherical or conical sealing surface and has a matching valve seat 30.
  • the valve seat 30 is hollow Shaped housing insert, in which the switching magnet 14, the closing element 31st against the force of the spring 17 and the pressure in the channel 29 from the shut-off position shown can lift off the valve seat 30 and bring it into the open position.
  • the Closing element 31 is acted upon by the pressure in channel 29 in the closing direction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
EP20030006777 2002-06-10 2003-03-25 Dispositif de serrage électrohydraulique Expired - Fee Related EP1371859B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20208989U DE20208989U1 (de) 2002-06-10 2002-06-10 Elektrohydraulische Spannvorrichtung
DE20208989U 2002-06-10

Publications (2)

Publication Number Publication Date
EP1371859A1 true EP1371859A1 (fr) 2003-12-17
EP1371859B1 EP1371859B1 (fr) 2006-11-29

Family

ID=29285779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030006777 Expired - Fee Related EP1371859B1 (fr) 2002-06-10 2003-03-25 Dispositif de serrage électrohydraulique

Country Status (2)

Country Link
EP (1) EP1371859B1 (fr)
DE (2) DE20208989U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006089535A1 (fr) * 2005-02-25 2006-08-31 Bosch Rexroth Ag Regulateur de pression a siege et deplacement hydraulique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423585A1 (de) 1993-07-21 1995-01-26 Heilmeier & Weinlein Elektrohydraulische Steuervorrichtung
JPH07243542A (ja) * 1994-01-12 1995-09-19 Toyo Electric Mfg Co Ltd 電磁操作機能を有する逆止弁
EP0884486A1 (fr) 1997-06-10 1998-12-16 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Dispositif de serrage électrohydraulique
US6199378B1 (en) * 1999-09-21 2001-03-13 Caterpillar Inc. Off-setting rate of pressure rise in a fluid system
DE20114538U1 (de) 2001-09-03 2001-10-31 Kuepper Weisser Gmbh Hydrauliksystem für die Eigengewichtsentlastung von Anbaugeräten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423585A1 (de) 1993-07-21 1995-01-26 Heilmeier & Weinlein Elektrohydraulische Steuervorrichtung
JPH07243542A (ja) * 1994-01-12 1995-09-19 Toyo Electric Mfg Co Ltd 電磁操作機能を有する逆止弁
EP0884486A1 (fr) 1997-06-10 1998-12-16 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Dispositif de serrage électrohydraulique
US6199378B1 (en) * 1999-09-21 2001-03-13 Caterpillar Inc. Off-setting rate of pressure rise in a fluid system
DE20114538U1 (de) 2001-09-03 2001-10-31 Kuepper Weisser Gmbh Hydrauliksystem für die Eigengewichtsentlastung von Anbaugeräten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 01 31 January 1996 (1996-01-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006089535A1 (fr) * 2005-02-25 2006-08-31 Bosch Rexroth Ag Regulateur de pression a siege et deplacement hydraulique

Also Published As

Publication number Publication date
EP1371859B1 (fr) 2006-11-29
DE20208989U1 (de) 2003-10-23
DE50305811D1 (de) 2007-01-11

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