EP1230998B1 - Méthode de contrôle automatique d'un outil électro-hydraulique et arrangement approprié - Google Patents

Méthode de contrôle automatique d'un outil électro-hydraulique et arrangement approprié Download PDF

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Publication number
EP1230998B1
EP1230998B1 EP02000190A EP02000190A EP1230998B1 EP 1230998 B1 EP1230998 B1 EP 1230998B1 EP 02000190 A EP02000190 A EP 02000190A EP 02000190 A EP02000190 A EP 02000190A EP 1230998 B1 EP1230998 B1 EP 1230998B1
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EP
European Patent Office
Prior art keywords
microprocessor
current
arrangement according
motor
pump motor
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Expired - Lifetime
Application number
EP02000190A
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German (de)
English (en)
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EP1230998A2 (fr
EP1230998A3 (fr
Inventor
Gerhard Goldbach
Ralph Langholz
Manfred Waltersdorf
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Rothenberger AG
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Rothenberger AG
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    • 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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses

Definitions

  • the invention relates to a method for automatically controlling electro-hydraulic hand tools according to the preamble of patent claim 1 and an arrangement here for according to the preamble of claim 3.
  • Such a method and such an arrangement are known from the DE 195 35 691 C1 ,
  • DE 21 36 782 C2 is a pneumatically or hydraulically powered hand tool with a working piston and a press head for the manufacture of pipe joints known.
  • the working piston is returned to the initial position by a return spring after each pressing process led back.
  • the pressure medium generation and control is not part of the hand tool and also not described.
  • US-A-2 254 613 is a hydraulic press with a hand pump, known with a working piston and a press head, in which the working piston is also performed after each pressing operation by its return spring to the starting position.
  • the return movement takes place until the end automatically by a arranged in a bypass and pilot-operated pressure relief valve, which has a conical tip and a downstream larger valve plate, which is effective after opening the apex.
  • the hand press also has an EMERGENCY button. An electrical or electronic control of the hydraulic system is neither provided nor possible because of the hand pump.
  • an electro-hydraulic hand tool which also has a working piston and is provided for the placement of a press head.
  • the working piston is also performed after each pressing operation by its return spring to the starting position. The return movement takes place until. End automatically through a valve system arranged in a bypass.
  • An electrical or electronic control of the hydraulic system is not provided. Rather, there is a hydraulic-mechanical locking of the operating switch until the end of the pressing process.
  • a press head for this is in the DE 44 46 504 C1 described.
  • JP 11198058 A Through the abstract of JP 11198058 A it is known in a purely electrically driven tool for producing beads to monitor the course of the motor current through a current sensor. When exceeding a predetermined value for the motor current, a microcomputer is started with a timer. When exceeding two seconds and a smaller increase in the motor current, a light emitting diode lights up to indicate to the operator that the pressing is completed. Neither the monitoring of the response of a (not disclosed) pressure relief valve by current measurement is disclosed nor the automatic engine shutdown after falling below a stored lower current value.
  • the invention is based on the object to provide a hand tool of the type described above, in which the pump motor is controlled at least substantially by the pressure curve in the hydraulic system.
  • the object is achieved to the full extent, in particular a hand tool of the type described above is given, in which the pump motor is controlled at least substantially by the pressure curve in the hydraulic system.
  • the invention is based on the consideration that the motor current of the pump motor is a sufficiently accurate or proportional image of the pressure curve in the hydraulic system and thus the flow of forces during operation, and that this property after conversion of the motor current into electrical or electronic signals to control and control the operation by a microprocessor with data storage and memory locations can be used for predefinable and possibly variable setpoints and operating parameters.
  • the signal evaluation can be further developed in connection with stored time-dependent signals and process parameters. Further advantages are given in the detailed description.
  • a drive cylinder 1 is shown with a one-sided working piston 2, which is acted upon by a return spring 3 and has a piston rod 4.
  • This piston rod can for example be provided with spreading rollers for a replaceable press head, not shown here, as it is used for the radial compression of pipe couplings.
  • the hand tool has a pump 5, which is arranged in a delivery line 6 between a tank 7 and the drive cylinder 1, and provided as a bypass return line 8, which connects the drive cylinder 1 to the tank 7 and arranged in a pilot-operated pressure relief valve 9 with hysteresis is.
  • the design and adjustment of the pressure relief valve 9 must be in any case so that the valve does not open before reaching the predetermined maximum pressing force (safety of the press connection).
  • the dependencies are u.a. the following: 1.
  • the deformation resistance (inter alia, depending on pipe material, pipe pairing and pipe diameter) and 2. the hydraulic fluid in connection with flow cross-sections, viscosity and temperature.
  • the design of the pressure relief valve 9 is in the direction that with the hand tool, e.g. By exchanging the press head, it is possible to produce pipe connections of different diameters (for example, from 16 to 54 mm in diameter), the design additionally corresponding to a safety margin for the largest possible diameter of the pipe connection. In all cases, the pressure rises steeply at the end of a pressing process in that the press jaws of the press head meet. This is also the case with tube head press heads at the lower end of the above range.
  • the pressure relief valve 9 is still associated with an emergency release lever, not shown here, with which the valve can be opened at any time by hand.
  • the pump 5 is driven by an electric pump motor 12, in the supply line 13 as a semiconductor switch (e.g., MOS) formed circuit breaker 14 is arranged, through which the pump motor 12 is driven current and time-dependent by a microprocessor 15.
  • a current sensor 16 is arranged, the output of the microprocessor 15 is connected via a line 17 for the purpose of comparison with at least one stored setpoint for the motor current.
  • the associated output of the microprocessor 15 is connected to the power switch 14 via a line 18.
  • the electronic control is based on two principles, namely a) current-dependent and b) time-dependent.
  • the current sensor 16 detects the current consumption "i" of the motor and thereby the pressing force "K".
  • the pressing force is approximately proportional to the current consumption.
  • the current consumption is also approximately proportional to the hydraulic pressure "P" (see also FIG. 2 ).
  • the microprocessor is assigned a data memory 19 designed as an EEPROM with at least one memory location for a setpoint value for the motor current and with at least two further memory locations for a minimum and a maximum switch-on duration of the pump motor 12.
  • the operating programs and setpoints for pressures and time values are also stored in this data memory FIG. 2 will be explained in more detail.
  • the arrangement also has a power source 20, which is designed as a power supply, network connection, but preferably as an accumulator. Between this current source 20 for the motor current and the microprocessor 15, a voltage sensor 21 for measuring the voltage of the current source 20 is arranged, and the voltage sensor 21 is connected to the microprocessor 15 via a line 22 for control purposes.
  • the control is used, inter alia, the state of charge of the accumulator or the Mains voltage to prevent malfunctions. If, for example, a reference value stored in the data memory 19 for the voltage is undershot, then the pump motor is immediately switched off again, since the capacity is no longer sufficient for a proper pressing operation.
  • a voltage regulator 23 for the operating voltage of the microprocessor 15 is arranged between the voltage sensor 21 and the microprocessor 15.
  • the microprocessor 15 is associated with an analog-to-digital converter 24, to which the outputs of the current sensor 16 and the voltage sensor 21 are connected.
  • microprocessor 15 in parallel four switches 25 are switched for the position-independent operation of the hand tool, e.g. for operation with the right or left hand and / or for operating the device in different spatial positions, which may be due to limited space when working.
  • a signal device 26 is connected for the respective operating state of the hand tool, which is preferably designed as a multi-color display, for example as a two-color LED with the primary colors red and yellow, which lead to an orange signal when mixed, which is even closer below is explained.
  • the microprocessor 15 also has internal data memories for the operating history of the hand tool and an interface 27 for retrieving the stored history of operation via an infrared transmitter 28.
  • the data memories formed as counters are incremented during each operation.
  • a total counter counts all operations since the device was manufactured.
  • a maintenance counter serves to maintain the necessary maintenance cycles. For example, if this counter registers 10,000 operations, the signaling device 26 flashes "yellow" five times after each operation to indicate to the operator that an inspection is due. This state is maintained until the maintenance counter through a handheld terminal via the interface 27 back to zero is set.
  • the infrared transmitter 28 all values stored in the data memories can also be read out and edited by means of the handheld terminal. This affects not only the counter readings, but also the stored parameters, which allow an adaptation of the entire device mechanics, including the motor and the current memory to the electronics. After loading the device, it works fully automatically.
  • FIG. 2 now shows graphs of the current waveforms "i" different operating states over the time "t".
  • the pump motor is turned on via the power switch 14 at time t1.
  • a corresponding starting current i anl of up to an idling current i falls rapidly empty, which is represented by the curve portion K1.
  • the period of time ⁇ t between t1 and t2 is stored as a blocking time and is for example 400 ms. If the switch is operated shorter than .DELTA.t, the engine is immediately switched off again to prevent random operations initiate a work process.
  • switches 25 it is possible by a short-term pressure on one of the switches 25 to initiate the infrared query without having to perform a work operation. Beyond t2, the switches 25 are blocked; they can be let go. By storing a further blocking period of a similar duration, it is possible to prevent the electronics from detecting and storing the starting current peak.
  • the voltage of the accumulator (as current source 20) is measured.
  • a five flashes of red signaling device 26 is an indication that the battery is discharged.
  • the engine idling current i empty is measured and stored once. This value is for detecting the operation of the EMERGENCY trip lever (not shown).
  • the motor current does not rise by a likewise stored difference, the motor is switched off again and the signal device 26 shows a faulty operation by five orange flashing, for example a machine defect or no working device, e.g. a press head was inserted, or that the emergency release lever was actuated immediately after the start.
  • the cheek plates close as the motor current increases. After the cheek plates abut the workpiece, a metal pipe or a pipe coupling, the actual pressing begins, the current strength increases significantly. This will be in FIG. 2 represented by the curve section K2.
  • the current consumption i max at time t4 is predetermined by the already described force-dependent opening of the pressure relief valve 9.
  • the pump motor 12 is switched off by the electronics and thus the power consumption is reduced to a quiescent current consumption of a few microamps, at which no work process is triggered.
  • the EMERGENCY triggering is initiated by manually opening the overpressure valve 9 during a work process at the time t3 below the above limiting current, the current decreases in accordance with the curve section K6, and the pump motor 12 falls below the stored no-load current plus a safety margin off. Also in this case, the signaling device 26 blinks "orange" five times to display this process.
  • FIG. 2 shows the following: If the pump motor continue to run after opening the pressure relief valve 9 beyond t5, then the motor current drops correspondingly to the dashed curve section K4, but only relatively slowly, which depends on the delivery rate of the pump 5 and the flow resistance. By switching off the engine at time t5, however, the motor current corresponding to the curve section K5 drops steeply, and the working piston 2 is now pushed back much faster under the action of the return spring 3 to its original position, the displaced amount of oil in the tank 7 back is promoted and the valve then closes again.
  • a time t max is stored in the data memory 19 at which the device switches off completely, for example after 10 to 15 seconds.
  • time points or time intervals ⁇ t (limited by t1 and t2) and t max .
  • the times t3, t4 and t5 result from the course of the pressure curve in FIG. 2 and this curve may be longer or shorter in the direction of the abscissa, depending on the deformation characteristics of the workpiece, eg a pipe joint, the flow resistances in the hydraulic system due to the viscosity of the hydraulic fluid, which in turn depends on the temperature, etc.
  • the timing t3 is preferable only because it is the timing of an emergency trip.
  • the time t4 arises from the response of the (adjustable) pressure relief valve 9 at the maximum pressure, represented by the upper limit current value i max , and the time t5 arises when falling below a predetermined, stored limit current value i stop , which is necessarily smaller than the upper limit current value i max at Response of the valve.

Claims (15)

  1. Procédé pour la commande automatique d'outillages ou d'outils électro-hydrauliques portatifs ou à main, notamment lors de la réalisation de raccords de liaison de tubes par déformation plastique de matériaux de tube, l'outil à main comprenant un vérin d'entraînement à cylindre (1) avec un piston de travail (2) simple effet, qui, en cas de détente de la pression, est repoussé dans sa position initiale par un ressort de rappel (3), l'outil à main comprenant par ailleurs, pour l'actionnement du vérin d'entraînement à cylindre (1), une pompe (5) alimentée à partir d'un réservoir (7), et pour l'écoulement de retour du fluide hydraulique au réservoir (7), une conduite d'écoulement de retour (8) dans laquelle est agencée une soupape de sécurité de pression (9) à commande pilote et effet d'hystérésis, la pompe (5) étant entraînée par un moteur de pompe (12) électrique, dans la ligne d'alimentation (13) duquel est placé un commutateur de puissance (14), caractérisé en ce que le moteur de pompe (12) est commandé, en fonction du courant, par un microprocesseur (15), de façon telle que le courant absorbé par le moteur de pompe (12) et la chute de courant après l'ouverture de la soupape de sécurité de pression (9) soient relevés par le microprocesseur (15), et que le courant du moteur soit interrompu par le commutateur de puissance (14) après passage sous une valeur de courant (istop) mémorisée.
  2. Procédé selon la revendication 1, caractérisé en ce que la mise en route d'une opération de travail est retardée par un temps de verrouillage (Δt) mémorisé, et en ce que la durée totale de marche du courant du moteur est limitée par une valeur de temps maximale (tmax) mémorisée.
  3. Agencement pour la commande automatique d'outillages ou d'outils électro-hydrauliques portatifs ou à main, notamment pour la réalisation de raccords de liaison de tubes par déformation plastique de matériaux de tube, comprenant un vérin d'entraînement à cylindre (1) avec un piston de travail (2) simple effet, qui est sollicité par un ressort de rappel (3) et présente une tige de piston (4), comprenant par ailleurs une pompe (5) disposée dans une conduite de refoulement (6) entre un réservoir (7) et le vérin d'entraînement à cylindre (1), comprenant également une conduite d'écoulement de retour (8), qui relie le vérin d'entraînement à cylindre (1) au réservoir (7), et dans laquelle est agencée une soupape de sécurité de pression (9) à commande pilote et effet d'hystérésis, l'agencement comprenant en outre un moteur de pompe (12) électrique, dans la ligne d'alimentation (13) duquel est placé un commutateur de puissance (14), caractérisé en ce que le moteur de pompe (12) est commandé, en fonction du courant, par un microprocesseur (15), auquel est associé au moins un commutateur (25) pouvant être actionné manuellement, et en ce que
    a) dans la ligne d'alimentation électrique (13) du moteur de pompe (12) est agencé un capteur de courant (16) dont la sortie est connectée au microprocesseur (15) aux fins d'une comparaison avec au moins une valeur de consigne mémorisée pour le courant de moteur,
    b) la sortie du microprocesseur (15) est connectée au commutateur de puissance (14) dans la ligne d'alimentation (13), et
    c) au microprocesseur (15) est associée au moins une mémoire de données (19) dans laquelle sont prévus des emplacements mémoire, à savoir :
    c1) pour une durée (Δt) en tant que temps de verrouillage pour une éventuelle fausse manoeuvre,
    c2) pour une durée maximale (tmax) pour l'arrêt lors d'un fonctionnement défectueux de l'appareil après actionnement dudit au moins un commutateur (25), ainsi que
    c3) pour au moins une valeur limite de courant (istop) pour l'arrêt ou l'interruption du courant du moteur, cette valeur limite de courant (istop) étant inférieure à une valeur limite de courant (imax) lors de l'ouverture de la soupape de sécurité de pression.
  4. Agencement selon la revendication 3, caractérisé en ce qu'entre une source de courant (20) pour le courant de moteur et le microprocesseur (15), est disposé un capteur de tension (21) pour la mesure de la tension de la source de courant (20), et en ce que le capteur de tension (21) est connecté au microprocesseur (15).
  5. Agencement selon la revendication 4, caractérisé en ce qu'entre le capteur de tension (21) et le microprocesseur (15), est disposé un régulateur de tension (23) pour la tension de fonctionnement du microprocesseur (15).
  6. Agencement selon les revendications 3 et 4, caractérisé en ce qu'au microprocesseur (15) est associé un convertisseur analogique/numérique (24) auquel sont connectées les sorties du capteur de courant (16) et du capteur de tension (21).
  7. Agencement selon la revendication 3, caractérisé en ce qu'au microprocesseur (15) sont connectés, selon un montage en parallèle, au moins deux commutateurs (25) pour la manoeuvre de l'outil à main indépendamment de la position.
  8. Agencement selon la revendication 7, caractérisé en ce que les commutateurs (25) peuvent être bloqués après écoulement du temps de verrouillage (Δt).
  9. Agencement selon l'une au moins des revendications 3 à 8, caractérisé en ce qu'au microprocesseur (15) est associé un dispositif de signalisation (26) pour l'affichage de l'état de fonctionnement de l'outil à main.
  10. Agencement selon la revendication 9, caractérisé en ce que le dispositif de signalisation (26) est réalisé sous la forme d'un affichage de couleurs multiples, clignotant.
  11. Agencement selon la revendication 3, caractérisé en ce qu'au microprocesseur (15) est associé au moins une mémoire de données pour l'historique de fonctionnement de l'outil à main.
  12. Agencement selon la revendication 3, caractérisé en ce qu'au microprocesseur (15) est associé au moins un compteur d'entretien pour la mémorisation et l'affichage d'intervalles d'entretien et d'échéances d'inspection de l'outil à main.
  13. Agencement selon la revendication 11, caractérisé en ce qu'au microprocesseur (15) est associée une interface (27) permettant la lecture de l'historique de fonctionnement.
  14. Agencement selon la revendication 13, caractérisé en ce qu'à l'interface (27) est associé un port de transmission infrarouge (28).
  15. Agencement selon la revendication 3, caractérisé en ce que dans la mémoire de données (15) sont stockés un temps de marche à vide maximal pour le moteur de pompe (12) et une valeur minimale pour le courant de moteur, et en ce que l'agencement est conçu de façon telle que le moteur de pompe (12) soit à nouveau arrêté lorsque la valeur minimale du courant de moteur n'a pas été dépassée pendant le temps de marche à vide.
EP02000190A 2001-02-12 2002-01-10 Méthode de contrôle automatique d'un outil électro-hydraulique et arrangement approprié Expired - Lifetime EP1230998B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10106360A DE10106360C1 (de) 2001-02-12 2001-02-12 Verfahren zum automatischen Steuern von elektro-hydraulischen Handwerkzeugen und Anordnung hierfür
DE10106360 2001-02-12

Publications (3)

Publication Number Publication Date
EP1230998A2 EP1230998A2 (fr) 2002-08-14
EP1230998A3 EP1230998A3 (fr) 2007-05-16
EP1230998B1 true EP1230998B1 (fr) 2009-10-21

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EP02000190A Expired - Lifetime EP1230998B1 (fr) 2001-02-12 2002-01-10 Méthode de contrôle automatique d'un outil électro-hydraulique et arrangement approprié

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Country Link
EP (1) EP1230998B1 (fr)
AT (1) ATE446149T1 (fr)
DE (2) DE10106360C1 (fr)
DK (1) DK1230998T3 (fr)
ES (1) ES2333105T3 (fr)
PT (1) PT1230998E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2501523B1 (fr) 2009-11-17 2015-04-29 Novopress GmbH Pressen und Presswerkzeuge & Co. KG Presse à guidage manuel

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PL2146823T3 (pl) * 2007-05-16 2014-05-30 Klauke Gmbh Gustav Sposób działania ręcznego urządzenia prasującego napędzanego silnikiem
DE202009003197U1 (de) 2009-03-10 2010-05-06 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kommanditgesellschaft Handführbare Antriebseinrichtung für ein Pressgerät
DE202009003196U1 (de) 2009-03-10 2010-04-29 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kommanditgesellschaft Handführbare Antriebseinrichtung für ein Pressgerät
DE102011011742A1 (de) * 2011-02-18 2012-08-23 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg Verfahren zum automatischen Steuern eines elektro-hydraulischen Presswerkzeuges
CN105170812A (zh) * 2015-09-10 2015-12-23 宁波长壁流体动力科技有限公司 一种扣压机的油路系统及其油路控制方法
EP3643422B8 (fr) * 2018-10-25 2023-07-26 Emerson Professional Tools AG Machine de pressage destinée au pressage d'outils
EP3650175A1 (fr) * 2018-11-06 2020-05-13 Von Arx AG Dispositif soupape de pompe hydraulique pour une machine à presser

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DE2136782C2 (de) * 1971-07-23 1982-12-02 Novopress GmbH Pressen und Presswerkzeuge & Co KG, 4000 Düsseldorf Tragbares druckmittelbetriebenes Klemmwerkzeug
IT1238264B (it) * 1990-03-02 1993-07-12 Trapano avvitatore.
DE4446504C1 (de) * 1994-12-25 1996-03-28 Rothenberger Werkzeuge Masch Preßwerkzeug zum radialen Verpressen von Werkstücken
DE29502032U1 (de) * 1995-02-08 1995-03-23 Foell Remswerk Preßwerkzeug
DE19616975B4 (de) * 1995-04-29 2008-04-17 REMS-WERK Christian Föll und Söhne GmbH & Co. Verfahren zur Prüfung der Preßkraft eines Preßwerkzeuges
DE19535691C1 (de) * 1995-09-26 1997-01-23 Rothenberger Werkzeuge Masch Hydraulisch angetriebenes Handwerkzeug
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JP4020218B2 (ja) * 1998-01-07 2007-12-12 株式会社ジーエス・ユアサコーポレーション 電動工具
CH693444A5 (de) * 1998-10-02 2003-08-15 Arx Ag Pressgerät zum Verbinden von Werkstücken.
DE19925504B4 (de) * 1999-03-02 2011-08-18 Gustav Klauke GmbH, 42855 System zum sicheren Aufbringen von Pressfittings, Presswerkzeug und Pressfitting
DE19938968A1 (de) * 1999-08-17 2001-03-01 Novopress Gmbh Handhabbares Arbeitsgerät, insbesondere Preßgerät

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2501523B1 (fr) 2009-11-17 2015-04-29 Novopress GmbH Pressen und Presswerkzeuge & Co. KG Presse à guidage manuel

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Publication number Publication date
EP1230998A2 (fr) 2002-08-14
ES2333105T3 (es) 2010-02-17
DE10106360C1 (de) 2002-07-11
DK1230998T3 (da) 2009-12-21
PT1230998E (pt) 2009-12-30
EP1230998A3 (fr) 2007-05-16
ATE446149T1 (de) 2009-11-15
DE50213933D1 (de) 2009-12-03

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