EP1815148B1 - Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung - Google Patents

Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung Download PDF

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Publication number
EP1815148B1
EP1815148B1 EP05826539A EP05826539A EP1815148B1 EP 1815148 B1 EP1815148 B1 EP 1815148B1 EP 05826539 A EP05826539 A EP 05826539A EP 05826539 A EP05826539 A EP 05826539A EP 1815148 B1 EP1815148 B1 EP 1815148B1
Authority
EP
European Patent Office
Prior art keywords
volume
stroke
drive device
hydraulic drive
piston
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
EP05826539A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1815148A1 (de
Inventor
Hans-Peter Neef
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.)
Schraubentechnik Neef GmbH
Loesomat Schraubtechnik Neef GmbH
Original Assignee
Schraubentechnik Neef GmbH
Loesomat Schraubtechnik Neef GmbH
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 Schraubentechnik Neef GmbH, Loesomat Schraubtechnik Neef GmbH filed Critical Schraubentechnik Neef GmbH
Priority to PL05826539T priority Critical patent/PL1815148T3/pl
Publication of EP1815148A1 publication Critical patent/EP1815148A1/de
Application granted granted Critical
Publication of EP1815148B1 publication Critical patent/EP1815148B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring

Definitions

  • the invention relates to a method for controlling the pressure supply of a connected to a pressure source hydraulic piston-cylinder unit and a hydraulic drive device with a connected to a pressure source piston-cylinder unit according to the preambles of the independent claims 1 and 4.
  • Piston-cylinder units are very often used to carry out a work operation in repeated load strokes and return strokes.
  • An application is, for example, in power wrenches, in which the piston-cylinder unit by means of a latch a ratchet wheel further rotates by an angle segment, so as to exert on a screw in particular a very high torque.
  • the detection of the end of the operation is carried out in practice in that an operator determines whether the piston-cylinder unit is still being operated or not.
  • the operator must constantly decide whether only the end position of the piston is reached in the torque wrench or whether the desired torque is already reached. When used in a power screwdriver this requires a continuous observation of the key nut by the operator.
  • the operator recognizes the end of the operation when the key nut stops rotating.
  • This method is time consuming and also associated with inaccuracies, since the rotational movement of the Ninuß when reaching the highest pressure, for example can be in the range of 800 bar, is very slow and can no longer be reliably detected by observation.
  • the operator also can not readily distinguish whether the screw to be tightened is stuck or whether, for example, the piston-cylinder unit has reached the piston end position. In other words, the operation of such a hydraulic tool is subject to the judgment of the operator, which is undesirable.
  • From the DE 102 22 159 A1 is a method for controlling the pressure supply of a hydraulic piston-cylinder unit has become known, in which the operation is automatically terminated upon reaching the desired force.
  • the change of the hydraulic pressure in time intervals is measured and the operation is terminated when the increase in pressure at a load stroke within a predetermined time is less than a predetermined limit.
  • the monitoring of the respective pressure in predetermined time intervals and the comparison of the pressure change is very expensive and requires a lot of control effort. In particular, this requires a complicated time measurement, which requires timers and the like.
  • the DE 42 41 764 A1 discloses a hydraulic circuit for the automatically repeated operation of a retractable and retractable hydraulic cylinder, in which the end of the movement of the hydraulic cylinder via a flow measurement in the tank line is detected and exploited via a corresponding signal for reversing the lifting movement of the hydraulic cylinder.
  • the arrangement of a flow sensor in the line between the actuating valve of the hydraulic cylinder and the tank, a single gauge for the switching of the cylinder movement and for the switching is used when reaching a limit force before the end of the stroke.
  • the flow sensor of this hydraulic circuit has an adjustable throttle and an adjustable pressure switch, which opens or closes a contact when a predetermined pressure is exceeded and makes the contact step undone when the pressure falls below the pressure.
  • the DE 199 52 591 B4 discloses a hydraulic system for controlling movable hydraulic elements with a hydraulic pump and a distribution system comprising hydraulic lines, in which a sensor designed as a flow meter is arranged in a hydraulic line common to all hydraulic cylinders for detecting the position of at least two hydraulic elements formed as hydraulic cylinders.
  • the US 5,668,328 discloses a pump unit for supplying a flow of hydraulic fluid under pressure to a hydraulically driven torque wrench, the pump unit comprising a hydraulic pump, a motor for driving the pump and a shaft for transmitting a torque from the motor to the pump at a certain speed.
  • the pumping unit also includes a velocity transducer for generating a velocity signal corresponding to the angular velocity of the wave, and a controller provided for processing the velocity signal into a signal representative of an angular position of the key.
  • the invention is based on the object, a method for controlling the pressure supply of a connected to a pressure source hydraulic piston-cylinder unit and a hydraulic drive device with a connected to a pressure source piston-cylinder unit, in particular for a hydraulic screwdriver of the type described, to the effect that the above-described disadvantages are eliminated and a reversal of the piston-cylinder unit with minimal technical and energy expenditure is possible.
  • the basic idea of the invention is to detect the quantity of a fluidic pressure medium displaced per load stroke independently of the set operating pressure and to perform a changeover to the return stroke only when the detected quantity of the displaced fluidic pressure medium reaches or exceeds a predefinable value. If this is not the case, the operation is terminated, i. switching to the return stroke is no longer possible.
  • the predefinable value can be determined and stored in advance by means of a simple calibration. Thus, only the amount of a fluidic pressure medium displaced during a load stroke is compared with a predeterminable amount and, based on this comparison, a control of the piston / cylinder unit is undertaken.
  • an advantageous embodiment provides that a signal which is characterized by a quantity detection means and which displaces the amount of fluidic pressure medium displaced per working stroke is compared with a stored signal in a control device and a switchover to the return stroke is effected as a function of this comparison.
  • the signal preferably comprises a plurality of electrical pulses.
  • the number of pulses is compared with a predefinable and determined during the calibration value, which in a memory of electronic control unit is stored, and a switching valve is driven when the number of pulses is greater than or equal to the stored value. In this case, switching immediately or without loss of time from the load or working stroke in the return stroke or vice versa.
  • the quantity detecting means is preferably arranged in the conduit between the space of the piston-cylinder unit in which the piston rod is located and a switching valve of the hydraulic drive means. Since the displaced amount at a load stroke corresponds to the inflowing amount in a return stroke, an automatic reversal of a load stroke in a return stroke is possible without an unnecessary pressure build-up with the aforementioned disadvantages. As a result, the full working travel of the piston-cylinder unit is achieved in particular during the load stroke and the return stroke, whereby an optimal effect, for example, a torque wrench is achieved.
  • the piston performs 19 load strokes and return strokes.
  • a cylinder chamber 28 is acted upon by means of a hydraulic line 14 with a high pressure medium under pressure.
  • a cylinder chamber 20 is acted upon by means of a hydraulic line 13 with a pressurized medium under pressure.
  • a hydraulic drive device 29 is provided which has a single-stage or multi-stage pump 11, a changeover valve 12, a control device 16 and a quantity detection means 15.
  • the pump 11 delivers from a tank 10, the pressure medium, which is supplied through the switching valve 12 at a load stroke via the line 14 to the pressure chamber 28 and a return stroke via the line 13 to the pressure chamber 20.
  • the quantity detection means 16 outputs a signal comprising a plurality of electrical pulses, which signal is supplied to the control device 16 via an electrical line 17. There it is compared with a stored in a (not shown) memory signal and made depending on the comparison, a reversal of the valve 12, so that a reversal of a load stroke in a return stroke or vice versa takes place.
  • a calibration key 27 is provided, which is actuated during a full working stroke. During this working stroke, the number of pulses is detected and stored. A changeover from a load stroke to a return stroke takes place as long as the stored value is reached or exceeded. If this is not the case and the hydraulic drive device, so the torque wrench is stationary, another load stroke is not possible. In this case, the desired torque is reached.
  • the controller 16 registers the failure or failure of the stored value and sends a signal to a control lamp in a remote controller.
  • an operator additionally receives a signal which indicates that the preset torque of the hydraulic torque wrench has been reached. In this way it is ensured that the achievement of precise torques is no longer a random assessment an operator are dependent, but is set exactly and by the signal of the indicator light 30 is displayed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Device For Special Equipments (AREA)
  • Vehicle Body Suspensions (AREA)
  • Braking Systems And Boosters (AREA)
EP05826539A 2004-11-26 2005-11-25 Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung Expired - Lifetime EP1815148B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05826539T PL1815148T3 (pl) 2004-11-26 2005-11-25 Sposób sterowania zasilania ciśnieniem hydraulicznego zespołu tłok-cylinder dołączonego do źródła ciśnienia oraz hydrauliczne urządzenie napędowe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004057402A DE102004057402B4 (de) 2004-11-26 2004-11-26 Verfahren zur Steuerung der Druckversorgung einer an eine Druckquelle angeschlossenen hydraulischen Kolben-Zylindereinheit und hydraulische Antriebseinrichtung
PCT/DE2005/002121 WO2006056187A1 (de) 2004-11-26 2005-11-25 Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung

Publications (2)

Publication Number Publication Date
EP1815148A1 EP1815148A1 (de) 2007-08-08
EP1815148B1 true EP1815148B1 (de) 2009-06-17

Family

ID=36096407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05826539A Expired - Lifetime EP1815148B1 (de) 2004-11-26 2005-11-25 Verfahren zur steuerung der druckversorgung einer an eine druckquelle angeschlossenen hydraulischen kolben-zylindereinheit und hydraulische antriebseinrichtung

Country Status (6)

Country Link
EP (1) EP1815148B1 (pl)
AT (1) ATE434136T1 (pl)
DE (2) DE102004057402B4 (pl)
DK (1) DK1815148T3 (pl)
PL (1) PL1815148T3 (pl)
WO (1) WO2006056187A1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3653888B1 (en) 2018-11-13 2023-01-25 Enerpac Tool Group Corp. Hydraulic power system and method for controlling same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007036328A1 (de) 2007-07-31 2009-02-05 Lösomat Schraubtechnik Neef Gmbh Mobiles Kraftschrauber-Bediengerät
CN107971960B (zh) * 2017-11-20 2019-06-14 上海舜诺机械有限公司 一种用于狭窄空间的液压式扳手

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823616A (en) * 1987-06-29 1989-04-25 Sps Technologies, Inc. Torque and angular displacement sensing in yield threshold controlled wrenches
US5592396A (en) * 1992-08-10 1997-01-07 Ingersoll-Rand Company Monitoring and control of fluid driven tools
DE4241764A1 (de) * 1992-12-11 1994-06-16 Hydrower Hydraulik Gmbh Hydraulische Schaltung für die automatisch wiederholte Betätigung eines Hydraulikzylinders
DE29623660U1 (de) * 1995-12-11 1999-04-15 Volkswagen Ag, 38440 Wolfsburg Vorrichtung zum Herstellen von Verschraubungen
DE19702544B4 (de) * 1996-02-01 2005-09-01 Volkswagen Ag Verfahren und Vorrichtung zum Herstellen von Schraubverbindungen
US5668328A (en) * 1996-07-17 1997-09-16 Applied Power Inc. Method and apparatus for hydraulically tightening threaded fasteners
DE19813900A1 (de) * 1998-03-28 1999-09-30 Frank Hohmann Hydraulisch betriebener Kraftschrauber und Verfahren zu seiner Herstellung
DE19952591B4 (de) * 1999-11-02 2004-07-15 Conti Temic Microelectronic Gmbh Hydrauliksystem
US6286412B1 (en) * 1999-11-22 2001-09-11 Caterpillar Inc. Method and system for electrohydraulic valve control
DE10222159A1 (de) * 2002-05-17 2003-11-27 Paul-Heinz Wagner Verfahren zur Steuerung einer hydraulischen Kolbenzylindereinheit
US7124057B2 (en) * 2003-08-19 2006-10-17 Festo Corporation Method and apparatus for diagnosing a cyclic system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3653888B1 (en) 2018-11-13 2023-01-25 Enerpac Tool Group Corp. Hydraulic power system and method for controlling same

Also Published As

Publication number Publication date
DE502005007532D1 (de) 2009-07-30
DE102004057402B4 (de) 2007-03-29
DK1815148T3 (da) 2009-10-12
PL1815148T3 (pl) 2009-11-30
WO2006056187A1 (de) 2006-06-01
DE102004057402A1 (de) 2006-06-01
ATE434136T1 (de) 2009-07-15
EP1815148A1 (de) 2007-08-08

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