EP1815148A1 - Procede pour commander l'apport de pression d'une unite piston-cylindre hydraulique connectee a une source de pression, et dispositif d'entrainement hydraulique - Google Patents

Procede pour commander l'apport de pression d'une unite piston-cylindre hydraulique connectee a une source de pression, et dispositif d'entrainement hydraulique

Info

Publication number
EP1815148A1
EP1815148A1 EP05826539A EP05826539A EP1815148A1 EP 1815148 A1 EP1815148 A1 EP 1815148A1 EP 05826539 A EP05826539 A EP 05826539A EP 05826539 A EP05826539 A EP 05826539A EP 1815148 A1 EP1815148 A1 EP 1815148A1
Authority
EP
European Patent Office
Prior art keywords
piston
stroke
cylinder unit
drive device
pressure medium
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
EP05826539A
Other languages
German (de)
English (en)
Other versions
EP1815148B1 (fr
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
Original Assignee
Schraubentechnik 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 filed Critical Schraubentechnik Neef GmbH
Priority to PL05826539T priority Critical patent/PL1815148T3/pl
Publication of EP1815148A1 publication Critical patent/EP1815148A1/fr
Application granted granted Critical
Publication of EP1815148B1 publication Critical patent/EP1815148B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 hydraulic piston-cylinder unit connected to a pressure source and to a hydraulic drive device having a piston-cylinder unit closed to a pressure source according to the preamble of the independent claims 1 and 5.
  • Piston-cylinder units are very often used to carry out a work operation in repeated load strokes and return strokes.
  • An application consists, for example, in power wrenches, in which the piston-cylinder unit continues to rotate a ratchet wheel by an angle segment by means of a latching pawl so as to exert on a screw a particularly high tightening torque.
  • DE 4241 764 A1 discloses a hydraulic circuit for the automatically repeated actuation of a retractable and retractable hydraulic cylinder, in which the end of the movement of the hydraulic cylinder is detected via a flow measurement in the tank line and via a corresponding signal is used for reversing the stroke movement of the hydraulic cylinder.
  • a flow sensor By arranging a flow sensor in the line between the actuating valve of the hydraulic cylinder and the tank, a single measuring device for the switching of the cylinder movement as well as 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.
  • EP 0 297 515 A1 discloses a device for exerting a torque and an angular displacement in a screwing device, in which the angular displacement is detected by an incremental flow measurement.
  • the incremental flow is directly proportional to the movement of a piston whose travel causes an angular displacement.
  • the invention is based on the object of further developing a method for controlling the pressure supply of a hydraulic piston-cylinder unit connected to a pressure source and a hydraulic drive device with a piston-cylinder unit connected to a pressure source, in particular for a hydraulic screwdriver of the type described in the introduction, that the above-described disadvantages are eliminated and a reversal of the piston-cylinder unit with minimal technical and energy expenditure is possible.
  • time measurements and associated timers and timers should be avoided.
  • the method for controlling the pressure supply of a piston-cylinder unit connected to a pressure source which actuates a hydraulic wrench, should also be designed such that a tightening torque is achieved independently of the judgment of an operator of the hydraulic wrench.
  • 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, ie a switchover to the return stroke is no longer done and there is an optical and / or acoustic signal output at the same time.
  • 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. A time measurement is not required here. The signal output signals an operator that the tightening torque has been reached.
  • 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 predeterminable value determined during the calibration process, which value is stored in a memory of the electronic control unit, and a switching valve is activated if 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 vor ⁇ mentioned disadvantages. As a result, in particular during the load stroke and the return stroke the full working travel of the piston-cylinder unit is achieved, whereby an optimum effect, for example, of a torque wrench is achieved. Further advantages and features of the invention are the subject matter of the fol lowing description and the drawings of an embodiment Ausrete ⁇ .
  • the drawing schematically shows a hydraulic drive device used by the invention.
  • the piston performs 19 load strokes and return strokes.
  • a cylinder space 28 is charged with a high-pressure pressure medium by means of a hydraulic line 14.
  • a cylinder chamber 20 is acted upon by a hydraulic line 13 with a pressure medium under low pressure.
  • a hydraulic drive device 29 is provided which has a single-stage or multi-stage pump 11, a switching 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 Umschaitventil 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 15 detects the backflow of the cylinder chamber 20 into the tank 10 during a load stroke and, in the event of a return stroke, the amount conveyed from the tank 10 into the cylinder chamber 20.
  • the quantity detecting 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 button 27 is provided which is actuated during a full working stroke. During this work, 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, that is to say the torque wrench, is stationary, a further load stroke is not possible. In this case, the desired tightening torque is achieved.
  • control device 16 registers the failure or failure to reach the stored value and transmits a signal to a control light in a remote control.
  • an operator additionally receives a signal which indicates that the pre-set torque of the hydraulic torque wrench has been reached. This ensures that the achievement of precise torques is no longer dependent on accidental Estimate an operator are dependent, but is set exactly and is indicated by the signal of the indicator light 30.

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 Procede pour commander l'apport de pression d'une unite piston-cylindre hydraulique connectee a une source de pression, et dispositif d'entrainement hydraulique Expired - Lifetime EP1815148B1 (fr)

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 (fr) 2004-11-26 2005-11-25 Procede pour commander l'apport de pression d'une unite piston-cylindre hydraulique connectee a une source de pression, et dispositif d'entrainement hydraulique

Publications (2)

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

Family

ID=36096407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05826539A Expired - Lifetime EP1815148B1 (fr) 2004-11-26 2005-11-25 Procede pour commander l'apport de pression d'une unite piston-cylindre hydraulique connectee a une source de pression, et dispositif d'entrainement hydraulique

Country Status (6)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107971960A (zh) * 2017-11-20 2018-05-01 陈壮壮 一种用于狭窄空间的液压式扳手

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
EP3653888B1 (fr) 2018-11-13 2023-01-25 Enerpac Tool Group Corp. Système d'alimentation hydraulique et son procédé de commande

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006056187A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107971960A (zh) * 2017-11-20 2018-05-01 陈壮壮 一种用于狭窄空间的液压式扳手
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

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 (fr) 2006-06-01
DE102004057402A1 (de) 2006-06-01
EP1815148B1 (fr) 2009-06-17
ATE434136T1 (de) 2009-07-15

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