EP2110205A2 - Procédé et dispositif de commande d'une visseuse hydraulique - Google Patents

Procédé et dispositif de commande d'une visseuse hydraulique Download PDF

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Publication number
EP2110205A2
EP2110205A2 EP09157357A EP09157357A EP2110205A2 EP 2110205 A2 EP2110205 A2 EP 2110205A2 EP 09157357 A EP09157357 A EP 09157357A EP 09157357 A EP09157357 A EP 09157357A EP 2110205 A2 EP2110205 A2 EP 2110205A2
Authority
EP
European Patent Office
Prior art keywords
pressure
time intervals
screw
pressurization
time interval
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
EP09157357A
Other languages
German (de)
English (en)
Other versions
EP2110205B1 (fr
EP2110205A3 (fr
Inventor
Jörg Hohmann
Frank Hohmann
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Individual
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Individual
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Publication date
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Publication of EP2110205A2 publication Critical patent/EP2110205A2/fr
Publication of EP2110205A3 publication Critical patent/EP2110205A3/fr
Application granted granted Critical
Publication of EP2110205B1 publication Critical patent/EP2110205B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • 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
    • B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components

Definitions

  • the invention relates to a method and a device for controlling a hydraulically operated power wrench with a pivotable by a piston-cylinder unit lever with a ratchet assembly for gradually turning a ratchet sleeve by Vorhübe and return strokes and a drive unit with a motor-driven pump.
  • a desired pressure which is the pressure which determines the tightening torque of the screw to be turned and at which the work is to be ended.
  • the characteristic pressure-time curve of the respective printing unit is determined in advance and stored in a calibration operation.
  • the invention has for its object to provide a method and apparatus for controlling a hydraulically powered power wrench, which allows with less effort to perform the control of the power wrench until reaching the desired torque.
  • the invention is based on the consideration that all pressurization cycles associated with a nut or screw rotation occur over a longer time interval than the pressurization cycles that take place without nut or screw rotation when tightened to the entered desired torque the elements of the power wrench no longer move and the pressure rise and pressure drop only over a period of time that corresponds to the elasticities in the elements of the power wrench and possibly the hydraulic lines.
  • These last time intervals are significantly shorter than the preceding time intervals, so that the comparison of the time duration of these last time intervals with the preceding, longer time intervals can be used directly as a switch-off criterion, without the need for calibration and the measurement of absolute values.
  • the measured time intervals can be moved so that after determining a first short time interval two further pressurizations take place, from these three short time intervals and three longer, previously measured time intervals each an average or the sum is formed and the repeated Be pressurization cycles off when the average or the sum of the short time intervals is less than the average or the sum of the longer time intervals.
  • time intervals when unscrewing the loose nut or screw until setting are shorter than the subsequent time intervals when tightening the nut or screw and until the beginning of tightening the nut or screw no more than five pressurization cycles are required, can be checked whether a Tightening the nut or screw has taken place after setting or not, or whether it is an already tightened nut or screw by the duration of the z.
  • the above-mentioned object is also by a hydraulically operated power wrench for performing the method defined above with a pivotable by a piston-cylinder unit lever with a ratchet assembly for gradually rotating a ratchet, a drive unit with a motor-driven pump, an input electronics for entering a Desired torque or a desired preload force or the screw size, the material quality, the thread pitch and the clamping length, evaluation electronics for determining a desired pressure from the entered values, an adjustable pressure valve arranged between the piston-cylinder unit and the pump, adjustable to the target pressure, an actual pressure sensor, a time measuring device for measuring the time interval of each pressurization from the initial pressure to the target pressure or from the beginning of the pressurization to the target pressure and subsequent pressure relief until Achieving the initial pressure, the transmitter according to the invention is adapted to control the pressurization cycles taking into account the measured time intervals so that the pressurization cycles are turned off when at least the last measured time interval is shorter than at least the penultimate time interval.
  • the evaluation electronics may be configured to form mean values or the sum of three short time intervals and three longer time intervals measured immediately and to switch off the pressurization cycles if the mean value or the sum of the short time intervals is shorter than the mean value or the sum of the longer time intervals Time intervals is.
  • the transmitter can also be adapted to the time intervals when unscrewing the loose nut or screw to set, the time intervals when tightening the nut or screw until reaching the desired torque corresponding target pressure and at least one time interval after reaching the To measure desired torque corresponding target pressure without further rotation of the nut or screw and to switch off the repeated pressurization cycles, if at least the last measured time interval is shorter than the previous one.
  • a hydraulically operated power wrench 1 comprises a piston-cylinder unit 2, a pivotable lever 3, which can be acted upon by the piston-cylinder unit 2, with a ratchet arrangement 5 for the stepwise rotation of a ratchet sleeve 4.
  • a swing angle ⁇ of the lever 3 This corresponds to the full stroke of the piston-cylinder unit. Accordingly, there is a fixed, geometric relationship between the stroke H and the pivot angle ⁇ .
  • the pivoting of the pivot lever 3 for tightening a screw or nut, not shown, takes place by acting on the piston-cylinder unit 2 with pressure oil from a drive unit 6, while the return stroke of the lever 3 is effected by a return spring, not shown.
  • the return stroke takes place as an idle stroke, since the ratchet arrangement releases the rotational connection between the lever 3 and the ratchet sleeve 4 during the return stroke.
  • the return stroke of the lever 3 can also be effected by reversing loading of the piston-cylinder unit 2 with pressure oil.
  • the drive of the pumps 7, 8 is effected by a common drive motor 9, which is formed in the illustrated embodiment as an electric motor.
  • a combined switching and pressure control valve 11 is connected with the pressure side of the pumps 7, 8, a combined switching and pressure control valve 11 is connected.
  • a pressure sensor 12 is arranged in the pressure line to the power screwdriver 1.
  • the measurement of the pressure in the pressure line can also be done by a connected to the drive motor 9 current measuring device 13 or by a connected to the drive motor 9 phase angle measuring device 14.
  • An electronic control unit 16 controlling the drive unit 6 is connected to an input electronics 17, preferably an input keyboard, and has inputs for the pressure transducer 12 and / or the power consumption measuring device 13 and / or the phase angle measuring device 14.
  • An output of the electronic control unit 16 is connected to the switching and pressure control valve 11.
  • the electronic control unit 16 comprises evaluation electronics 18 for determining a desired pressure from the screw values entered into the input electronics 17, namely a desired torque or a desired preload force or the screw size, the thread pitch and the clamping length.
  • the electronic control unit 16 comprises a time measuring device 19 and a control and shutdown device 20 for switching off the movement of the piston-cylinder unit 2 when the setpoint torque is reached.
  • the desired preload force or torque is determined by the modulus of elasticity of the screw material, the allowable tensile stress, d. H. the material quality, the shank cross-section and the screw length specified and can be given for example on the screw itself or in a table.
  • the evaluation electronics 18 can also determine the desired preload force, therefrom the desired torque and, in turn, the desired pressure when the screw material, the screw quality, the screw size, the thread pitch and the clamping length are entered.
  • the motor 9 is set to drive the pumps 7, 8 in operation or is constantly running the drive motor 9, a pressure relief valve in the switch - And pressure control valve 11 is closed, so that builds up in the pressure line to the power screwdriver 1 of the pump pressure.
  • This pressure initially increases when unscrewing the loose nut or screw until it is set to the desired pressure, which it reaches at time t1. During this time, the ratchet box 4 is turned over the full forward stroke without much resistance.
  • the switching and pressure control valve 11 Immediately upon reaching the target pressure from the time t1, the switching and pressure control valve 11 is switched to pressure relief, a spring not shown causes the idle stroke of the piston-cylinder unit 2 and the hydraulic oil contained therein is via the switching and pressure control valve 11 in a Hydraulic oil tank 10 fed back, from where it is sucked by the pumps 7, 8.
  • the pressure decreases from the time t1 to the time t2 to the initial pressure and the entire time interval .DELTA.t 1 from the pre-stroke and return stroke is measured.
  • either the entire time interval ⁇ t 4 , ⁇ t 5 , ⁇ t 6 can be measured between times t 6 , t 8 , t 10 and t 12, respectively, but a useful assessment criterion is also achieved if only the time intervals between the periods t 6 , t 7 ; t 8 , t 9 , and t 10 , t 11 are measured.
  • the invention forms the averages from the time intervals ⁇ t 4 , ⁇ t 5 and ⁇ t 6 and the time intervals ⁇ t 7 , ⁇ t 8 , and ⁇ t 9 , or they become simple only summed and compared with each other, so that the operation is aborted when the average values from the time intervals .DELTA.t 7 , .DELTA.t 8 , and .DELTA.t 9 and from .DELTA.t 4 , .DELTA.t 5 and .DELTA.t 6 meet the switch-off criterion.
  • Averaging can be dispensed with if only the sums of the named time intervals are compared with one another in order to fulfill the switch-off criterion.
  • Timing may also be used to detect a failure to tighten a threaded connection. Namely, if a nut or screw can not turn from the beginning because it is already tightened or blocked for some reason, eliminates the longer time intervals .DELTA.t 4 , .DELTA.t 5 and .DELTA.t 6 , and only the time intervals .DELTA.t 1 , .DELTA.t 2 , ⁇ t 3 and three other short time intervals ⁇ t i measured, this is a sign for an already tightened nut or screw or not one proper tightening of the nut or screw.
  • the transmitter 18 can generate an error signal from this, which is displayed on a screen, not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP09157357.6A 2008-04-18 2009-04-06 Procédé et dispositif de commande d'une visseuse hydraulique Active EP2110205B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008019765A DE102008019765A1 (de) 2008-04-18 2008-04-18 Verfahren und Vorrichtung zum Steuern eines hydraulisch betriebenen Kraftschraubers

Publications (3)

Publication Number Publication Date
EP2110205A2 true EP2110205A2 (fr) 2009-10-21
EP2110205A3 EP2110205A3 (fr) 2016-03-02
EP2110205B1 EP2110205B1 (fr) 2017-11-08

Family

ID=40902858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09157357.6A Active EP2110205B1 (fr) 2008-04-18 2009-04-06 Procédé et dispositif de commande d'une visseuse hydraulique

Country Status (4)

Country Link
US (1) US8056426B2 (fr)
EP (1) EP2110205B1 (fr)
DE (1) DE102008019765A1 (fr)
ES (1) ES2656408T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101776073A (zh) * 2010-03-12 2010-07-14 周重威 用于超高压液压扳手的油泵站
WO2011150909A1 (fr) * 2010-05-11 2011-12-08 Lösomat Schraubtechnik Neef Gmbh Ensemble circuit pour faire fonctionner un tournevis dynamométrique ou analogue
WO2012067602A1 (fr) * 2010-11-15 2012-05-24 HYTORC Division Unex Corporation Unité d'entraînement d'un outil à moteur
WO2017021074A1 (fr) * 2015-08-06 2017-02-09 Siemens Aktiengesellschaft Procédé et dispositif d'expulsion d'aube
CN106425969A (zh) * 2016-12-26 2017-02-22 重庆鼎誉机电有限公司 一种液压扳手
EP3653888A3 (fr) * 2018-11-13 2020-08-05 Enerpac Tool Group Corp. Système d'alimentation hydraulique et son procédé de commande
US12392331B2 (en) 2017-05-16 2025-08-19 Enerpac Tool Group Corp. Hydraulic pump with two-stage operation

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Publication number Priority date Publication date Assignee Title
CN102581804B (zh) * 2012-02-07 2014-06-18 胡井湖 高精度智能液压扭矩扳手专用泵及液压扭矩扳手控制方法
US20150316919A1 (en) * 2013-05-16 2015-11-05 HYTORC Division Unex Corporation Multifunctional Hydraulic Drive Unit
WO2015009850A1 (fr) * 2013-07-19 2015-01-22 Pro-Dex, Inc. Tournevis de limitation de couple
US9550282B2 (en) * 2014-04-22 2017-01-24 John D. Davis Compact hydraulic torque wrench cartridge
CN105320168B (zh) 2014-07-31 2017-06-06 中国气动工业股份有限公司 扭力控制方法及其扭力控制装置
US9839998B2 (en) * 2015-04-07 2017-12-12 General Electric Company Control system and apparatus for power wrench
US10383674B2 (en) 2016-06-07 2019-08-20 Pro-Dex, Inc. Torque-limiting screwdriver devices, systems, and methods
DE102017101727B4 (de) 2017-01-30 2018-10-31 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Ermittlung einer Zeitdauer bei einem Reifenwechsel eines Fahrzeugs, System, Computerprogramm und Computerprogrammprodukt
DE102018111652A1 (de) * 2018-05-15 2019-11-21 STAHLWILLE Eduard Wille GmbH & Co. KG Werkzeug und Verfahren zum Betätigen eines Werkzeuges
KR102762259B1 (ko) 2018-08-20 2025-02-03 프로-덱스, 인코포레이티드. 토크-제한 장치, 시스템, 및 방법
DE102021125441A1 (de) 2021-09-30 2023-03-30 Juko Technik Gmbh Hydraulisches Schraubsystem mit konfigurierbarer Steuereinheit

Citations (1)

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DE10222159A1 (de) 2002-05-17 2003-11-27 Paul-Heinz Wagner Verfahren zur Steuerung einer hydraulischen Kolbenzylindereinheit

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US4791838A (en) * 1986-05-30 1988-12-20 Raymond Engineering Inc. Apparatus and method for determining torque, presenting digital torque readout and automatic cycling and termination of wrench operation in a torque wrench system
US4864903A (en) * 1986-11-12 1989-09-12 Raymond Engineering Inc. Apparatus and method of determining torque, presenting digital torque readout and automatic cycling and termination of wrench operation
US4941362A (en) * 1987-06-29 1990-07-17 Sps Technologies, Inc. Torque and angular displacement sensing in controlled wrenches
BE1007527A3 (fr) * 1993-10-29 1995-07-25 Daniel Octaaf Ghisla Torrekens Procede et dispositif de commande d'un verin a double effet actionne par un fluide sous pression.
US5617771A (en) * 1996-01-11 1997-04-08 Power Team Div. Of Spx Corp. Auto cycle pump
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
EP1750906A2 (fr) * 2004-02-04 2007-02-14 Actuant Corporation Systeme de cle dynamometrique hydraulique
DE102004017979A1 (de) * 2004-04-14 2005-11-03 Wagner, Paul-Heinz Verfahren zum winkelgesteuerten Drehen eines Teiles
DE102004043145B3 (de) * 2004-09-03 2006-05-18 Hohmann, Jörg Hydraulische Schraubenspannvorrichtung

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Publication number Priority date Publication date Assignee Title
DE10222159A1 (de) 2002-05-17 2003-11-27 Paul-Heinz Wagner Verfahren zur Steuerung einer hydraulischen Kolbenzylindereinheit

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101776073A (zh) * 2010-03-12 2010-07-14 周重威 用于超高压液压扳手的油泵站
WO2011150909A1 (fr) * 2010-05-11 2011-12-08 Lösomat Schraubtechnik Neef Gmbh Ensemble circuit pour faire fonctionner un tournevis dynamométrique ou analogue
RU2557859C2 (ru) * 2010-05-11 2015-07-27 Лезомат Шраубтехник Нееф Гмбх Система дистанционного управления гидравлическим динамометрическим винтовертом
US9193049B2 (en) 2010-05-11 2015-11-24 Loesomat Schraubtechnik Neef Gmbh Circuit arrangement for operating a torque wrench or similar
EA030037B1 (ru) * 2010-11-15 2018-06-29 Хайторк Дивижн Юнекс Корпорейшн Приводной агрегат для инструмента с силовым приводом
WO2012067602A1 (fr) * 2010-11-15 2012-05-24 HYTORC Division Unex Corporation Unité d'entraînement d'un outil à moteur
GB2498889A (en) * 2010-11-15 2013-07-31 Hytorc Division Unex Corp Drive unit for a power operated tool
GB2498889B (en) * 2010-11-15 2015-10-28 Hytorc Division Unex Corp Drive unit for a power operated tool
AU2010364000B2 (en) * 2010-11-15 2017-02-02 HYTORC Division Unex Corporation Drive unit for a power operated tool
WO2017021074A1 (fr) * 2015-08-06 2017-02-09 Siemens Aktiengesellschaft Procédé et dispositif d'expulsion d'aube
US10953526B2 (en) 2015-08-06 2021-03-23 Siemens Aktiengesellschaft Method and drive-out device for driving out a blade
CN106425969A (zh) * 2016-12-26 2017-02-22 重庆鼎誉机电有限公司 一种液压扳手
US12392331B2 (en) 2017-05-16 2025-08-19 Enerpac Tool Group Corp. Hydraulic pump with two-stage operation
EP3653888A3 (fr) * 2018-11-13 2020-08-05 Enerpac Tool Group Corp. Système d'alimentation hydraulique et son procédé de commande
US11193508B2 (en) 2018-11-13 2021-12-07 Enerpac Tool Group Corp. Hydraulic power system and method for controlling same
EP3653888B1 (fr) 2018-11-13 2023-01-25 Enerpac Tool Group Corp. Système d'alimentation hydraulique et son procédé de commande
US11572900B2 (en) 2018-11-13 2023-02-07 Enerpac Tool Group Corp. Hydraulic power system and method for controlling same

Also Published As

Publication number Publication date
US20090260485A1 (en) 2009-10-22
EP2110205B1 (fr) 2017-11-08
DE102008019765A1 (de) 2009-10-22
ES2656408T3 (es) 2018-02-27
US8056426B2 (en) 2011-11-15
EP2110205A3 (fr) 2016-03-02

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