EP2569125A1 - Circuit arrangement for operating a torque wrench or similar - Google Patents

Circuit arrangement for operating a torque wrench or similar

Info

Publication number
EP2569125A1
EP2569125A1 EP11752085A EP11752085A EP2569125A1 EP 2569125 A1 EP2569125 A1 EP 2569125A1 EP 11752085 A EP11752085 A EP 11752085A EP 11752085 A EP11752085 A EP 11752085A EP 2569125 A1 EP2569125 A1 EP 2569125A1
Authority
EP
European Patent Office
Prior art keywords
pressure
circuit arrangement
unit
piston
proportional valve
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
EP11752085A
Other languages
German (de)
French (fr)
Other versions
EP2569125B1 (en
Inventor
Marc Gareis
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.)
Gedore Holding GmbH
Original Assignee
Losomat Schraubtechnik 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 Losomat Schraubtechnik Neef GmbH, Loesomat Schraubtechnik Neef GmbH filed Critical Losomat Schraubtechnik Neef GmbH
Publication of EP2569125A1 publication Critical patent/EP2569125A1/en
Application granted granted Critical
Publication of EP2569125B1 publication Critical patent/EP2569125B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • F15B13/0442—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors with proportional solenoid allowing stable intermediate positions
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means

Definitions

  • the invention relates to a circuit arrangement for operating a torque wrench or the like, which has a piston-cylinder unit, which can be controlled by a pump with a predetermined pressure.
  • Such hydraulic torque wrenches are often connected with long, often with up to 10 m long hoses with a hydraulic unit that includes the pump. An operator operating the hydraulic torque wrench is thus no longer within sight of the hydraulic power unit. However, a visual inspection of whether the set pressure has actually been reached makes it essential to have a manometer located in the area of the hydraulic unit. Therefore, there is a desire of the operator to be able to set and read all functions of the hydraulic unit by means of a remote control, without having to go to the momentary and the torque wrench example remote location of the hydraulic unit.
  • CONFIRMATION COPY A first consists in a pressure preselection by means of a manometer. Usually, the target pressure is adjusted by means of a manual pressure regulator and a manometer. As soon as the set final pressure is reached, an overflow valve responds. Here, the set final pressure can be maintained.
  • Another variant relates to the pressure preselection by means of a pressure switch.
  • the set target pressure is controlled by a pressure switch.
  • the pressure switch interrupts the supply of hydraulic fluid. With this method, the set final pressure can not be maintained.
  • the invention has for its object to provide a circuit arrangement available, which allows the operator to operate the hydraulic unit connected, for example, hydraulic wrench completely by means of a control panel in the form of a remote control and thereby also a short-term creep of a screw through a pending pressure to master. This happens because the pressure is maintained in this case.
  • the basic idea of the invention is to use a proportional valve for very high pressures in a circuit arrangement for a hydraulic unit in the forward / reverse flow of the piston-cylinder unit.
  • the proportional valve is designed for pressures of up to 800 bar.
  • the proportional valve is electrically controllable, wherein the opening cross-section of the valve is variable depending on the control variable, for example a drive voltage.
  • an advantageous development provides that the proportional valve can be controlled by a control device.
  • This control device signals of a arranged in the forward and / or return flow rate detection means and / or a pressure detection means can be fed.
  • control device by an operator by means of a remote control unit data can be fed.
  • the control device controls the voltage applied to the piston-cylinder unit pressure via the proportional valve in response to the signals of the quantity detection means and / or the pressure detecting means.
  • a pressure control is possible, which allows holding the pressure and thus also allows compensation of the above-mentioned short-term creep of screw connections.
  • a hydraulic torque wrench comprises a piston-cylinder unit 18 with a piston 19 arranged in a cylinder 26, with a piston rod-side pressure chamber 20 arranged on the side of a piston rod 21 and with a cylinder space 28.
  • Both the piston rod-side pressure chamber 20 and the cylinder chamber 28 are each connected via hydraulic lines, a hydraulic line return 13, which opens into the piston rod side pressure chamber 20, and a hydraulic line flow 14, which opens into the cylinder chamber with a tank 10.
  • a single or multi-stage pump 11 is arranged, which is operated by a motor M.
  • the pump 11 itself and its motor M can be arranged in the hydraulic fluid for cooling purposes.
  • a proportional valve 12 is connected, which is controllable via an electrical control line 27 by a control device 16.
  • the control device 16 in turn is adjustable via an electrical line or via radio from a remote control unit 31, that is, there is a data exchange between the controller 16 and the remote control unit 31 instead.
  • a quantity detection means 15 is arranged in the hydraulic line return 13 in the hydraulic line return 13, a quantity detection means 15 is arranged in the hydraulic line return 13, a quantity detection means 15 is arranged in the hydraulic line return 13, a quantity detection means 15 is arranged.
  • the hydraulic line flow 14 has a pressure measuring means 22. Both the output signals of the quantity detecting means 15 and the output signals of the pressure measuring means 22 are supplied to the control device 16 via electrical lines 17 and 23.
  • the operation of the circuit arrangement is carried out by an operator (not shown) who is located in the region of the screw connection to be produced, for example.
  • This operator can specify by means of the remote control unit 31 desired data, such as the tightening torque of the screw, which are supplied to the control unit 16.
  • the control unit 16 calculates in dependence on the means of the
  • Pressure measuring means 22 detected pressure and optionally also in response to the detected by means of the quantity detection means 15 return amount of the fluid, a drive signal for the proportional valve 12th
  • the proportional valve 12 has two functions in this circuit arrangement. On the one hand, it performs the function of a reversing unit between flow and return, on the other hand, it serves as a pressure limiting means to set a preset by an operator by means of the remote control unit 31 pressure and hold. As a result, creeping processes which are compensated when producing screw connections which are subjected to a very high torque can also be compensated.
  • the proportional valve is designed for very high pressures, which can be up to 800 bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

The invention relates to a circuit arrangement for operating a hydraulic torque wrench or similar, comprising a piston-cylinder unit (18) that can be controlled at a predetermined pressure by a pump (11). Said arrangement is characterised in that the piston-cylinder unit (18) can be controlled by the pump (11) by means of a proportional valve (12) which acts both as a reversing unit between the forward and return travel and as a pressure control valve.

Description

Schaltungsanordnung zum Betreiben eines Drehmomentschraubers oder dergleichen  Circuit arrangement for operating a torque screwdriver or the like
Die Erfindung betrifft eine Schaltungsanordnung zum Betreiben eines Drehmomentschraubers oder dergleichen, welcher eine Kolben-Zylinder-Einheit aufweist, die von einer Pumpe mit einem vorgebbaren Druck ansteuerbar ist. The invention relates to a circuit arrangement for operating a torque wrench or the like, which has a piston-cylinder unit, which can be controlled by a pump with a predetermined pressure.
Derartige hydraulische Drehmomentschrauber sind mit oft langen, sehr oft mit bis zu 10 m langen Schläuchen mit einem Hydraulikaggregat, das die Pumpe umfasst, verbunden. Eine Bedienungsperson, die den hydraulischen Drehmomentschrauber bedient, ist auf diese Weise nicht mehr in Sichtweite des Hydraulikaggregats. Bei einer Sichtkontrolle, ob der eingestellte Druck tatsächlich erreicht wurde, ist jedoch ein Blick auf ein Manometer, das im Bereich des Hydraulikaggregats angeordnet ist, unerlässlich. Es besteht daher der Wunsch der Bedienungsperson, alle Funktionen des Hydraulikaggregats mittels einer Fernsteuerung einstellen und ablesen zu können, ohne den momentanen und vom Drehmomentschrauber beispielsweise entfernten Standort des Hydraulikaggregats aufsuchen zu müssen. Such hydraulic torque wrenches are often connected with long, often with up to 10 m long hoses with a hydraulic unit that includes the pump. An operator operating the hydraulic torque wrench is thus no longer within sight of the hydraulic power unit. However, a visual inspection of whether the set pressure has actually been reached makes it essential to have a manometer located in the area of the hydraulic unit. Therefore, there is a desire of the operator to be able to set and read all functions of the hydraulic unit by means of a remote control, without having to go to the momentary and the torque wrench example remote location of the hydraulic unit.
Zur Lösung dieses Problems wurden im Stand der Technik verschiedene Lösungsmöglichkeiten angeboten. To solve this problem, various solutions have been offered in the prior art.
BESTÄTIGUNGSKOPIE Eine erste besteht in einer Druckvorwahl mittels eines Manometers. Dabei wird gewöhnlich der Solldruck mittels eines manuellen Druckreglers und eines Manometers eingestellt. Sobald der eingestellte Enddruck erreicht ist, spricht ein Überlaufventil an. Hierbei kann der eingestellte Enddruck gehalten werden. CONFIRMATION COPY A first consists in a pressure preselection by means of a manometer. Usually, the target pressure is adjusted by means of a manual pressure regulator and a manometer. As soon as the set final pressure is reached, an overflow valve responds. Here, the set final pressure can be maintained.
Eine weitere Variante betrifft die Druckvorwahl mittels eines Druckschalters. Dabei wird der eingestellte Solldruck mit einem Druckschalter kontrolliert. Wird der Enddruck erreicht, unterbricht der Druckschalter die Zufuhr von Hydraulikfluid. Mit diesem Verfahren kann der eingestellte Enddruck nicht gehalten werden. Another variant relates to the pressure preselection by means of a pressure switch. The set target pressure is controlled by a pressure switch. When the final pressure is reached, the pressure switch interrupts the supply of hydraulic fluid. With this method, the set final pressure can not be maintained.
Der erstgenannte Vorschlag einer Druckvorwahl mittels Manometer weist den Nachteil auf, dass der Bediener jede Einstellung oder Korrektur des Drucks direkt am Hydraulikaggregat selbst vornehmen muss. Da sich jedoch die Bedienungsperson während des Arbeitens zusammen mit einer Bedieneinheit und dem Hydraulikschrauber von dem Hydraulikaggregat entfernt befindet, ist eine solche Einstellung nicht ohne Weiteres möglich. Auch die visuelle Kontrolle des Enddrucks am Manometer muss auf diese Weise über eine räumliche Entfernung erfolgen, wodurch Ungenauigkeiten bei der Ablesung entstehen können. Dadurch, dass der eingestellte Enddruck gehalten wird, kann jedoch ein Kriechen der Schraubverbindung, also eine Verringerung der Vorspannkraft durch plastisches Fließen, beherrscht werden und der Druck kann im Grunde beliebig lange anstehen. The former suggestion of pressure preselection by means of manometer has the disadvantage that the operator must make any adjustment or correction of the pressure directly on the hydraulic unit itself. However, since the operator is away from the hydraulic power unit while working together with a control unit and the hydraulic wrench, such an adjustment is not readily possible. Also, the visual control of the end pressure on the pressure gauge must be done in this way over a spatial distance, which may result in inaccuracies in the reading. The fact that the set final pressure is maintained, however, a creep of the screw, so a reduction in the biasing force can be controlled by plastic flow, and the pressure can basically be indefinitely.
Die zweitgenannte Variante„Druckvorwahl mittels Druckschalter" ermöglicht zwar eine Einstellung des Drucks losgelöst vom Hydraulikaggregat. Nachteilig hierbei ist jedoch, dass der Druck nicht gehalten werden kann, da der Schalter die Hydraulikzufuhr und damit gewissermaßen den„Fließdruck" unterbricht. Auf diese Weise kann ein Kriechen der Schraubverbindung nicht ausgeglichen werden. Der Erfindung liegt die Aufgabe zugrunde, eine Schaltungsanordnung zur Verfügung zu stellen, welche es dem Bediener ermöglicht, den am Hydraulikaggregat angeschlossenen, beispielsweise Hydraulikschrauber komplett mittels eines Bedienteils in Form einer Fernsteuerung bedienen zu können und dabei auch ein kurzzeitiges Kriechen einer Schraubverbindung durch einen anstehenden Druck beherrschen zu können. Dies geschieht dadurch, dass der Druck auch in diesem Falle gehalten wird. Although the second-named variant "pressure preselection by means of a pressure switch" makes it possible to set the pressure detached from the hydraulic unit, the disadvantage here is that the pressure can not be maintained since the switch interrupts the hydraulic supply and thus to a certain extent the "flow pressure". In this way, a creep of the screw can not be compensated. The invention has for its object to provide a circuit arrangement available, which allows the operator to operate the hydraulic unit connected, for example, hydraulic wrench completely by means of a control panel in the form of a remote control and thereby also a short-term creep of a screw through a pending pressure to master. This happens because the pressure is maintained in this case.
Diese Aufgabe wird durch eine Schaltungsanordnung der gattungsgemäßen Art dadurch gelöst, dass die Kolben-Zylinder-Einheit von der Pumpe über ein Proportionalventil ansteuerbar ist, welches sowohl als Umsteuereinheit zwischen Vor- und Rücklauf, als auch als Druckbegrenzungseinheit wirkt. This object is achieved by a circuit arrangement of the generic type in that the piston-cylinder unit can be controlled by the pump via a proportional valve, which acts both as a reversing unit between flow and return, and as a pressure limiting unit.
Grundidee der Erfindung ist es, ein Proportionalventil für sehr hohe Drücke in einer Schaltungsanordnung für ein Hydraulikaggregat in dem Vor-/Rücklauf der Kolben-Zylinder-Einheit einzusetzen. Das Proportionalventil ist dabei für Drücke von bis zu 800 bar ausgelegt. Das Proportionalventil ist elektrisch ansteuerbar, wobei abhängig von der Ansteuergröße, beispielsweise einer Ansteuerspannung, der Öffnungsquerschnitt des Ventils veränderbar ist. The basic idea of the invention is to use a proportional valve for very high pressures in a circuit arrangement for a hydraulic unit in the forward / reverse flow of the piston-cylinder unit. The proportional valve is designed for pressures of up to 800 bar. The proportional valve is electrically controllable, wherein the opening cross-section of the valve is variable depending on the control variable, for example a drive voltage.
Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind Gegenstand der auf Anspruch 1 rückbezogenen Unteransprüche. So sieht eine vorteilhafte Weiterbildung vor, dass das Proportionalventil von einer Steuereinrichtung ansteuerbar ist. Dieser Steuereinrichtung sind Signale eines in der Vor- und/oder Rückleitung angeordneten Mengenerfassungsmittels und/oder eines Druckerfassungsmittels zuführbar. Advantageous developments and refinements of the invention are the subject of the dependent claims on claim 1. Thus, an advantageous development provides that the proportional valve can be controlled by a control device. This control device signals of a arranged in the forward and / or return flow rate detection means and / or a pressure detection means can be fed.
Um eine Bedienung räumlich getrennt von dem Hydraulikaggregat zu ermöglichen, ist vorgesehen, dass der Steuereinrichtung von einer Bedienungsperson mittels einer Fernsteuereinheit Daten zuführbar sind. Die Steuereinrichtung steuert den an der Kolben-Zylinder-Einheit anliegenden Druck über das Proportionalventil in Abhängigkeit von den Signalen des Mengenerfassungsmittels und/oder des Druckerfassungsmittels an. Hierdurch ist eine Druckregelung möglich, die ein Halten des Drucks erlaubt und so auch einen Ausgleich des vorstehend erwähnten kurzzeitigen Kriechens von Schraubenverbindungen erlaubt. In order to enable operation spatially separated from the hydraulic unit, it is provided that the control device by an operator by means of a remote control unit data can be fed. The control device controls the voltage applied to the piston-cylinder unit pressure via the proportional valve in response to the signals of the quantity detection means and / or the pressure detecting means. As a result, a pressure control is possible, which allows holding the pressure and thus also allows compensation of the above-mentioned short-term creep of screw connections.
Weitere Vorteile und Merkmale der Erfindung werden nachfolgend in Verbindung mit der Zeichnung beschrieben, in der schematisch ein Schaltbild einer erfindungsgemäßen Schaltungsanordnung dargestellt ist. Further advantages and features of the invention will be described below in conjunction with the drawing, in which a schematic diagram of a circuit arrangement according to the invention is shown schematically.
Ein hydraulischer Drehmomentschrauber weist eine Kolben-Zylinder-Einheit 18 auf, mit einem in einem Zylinder 26 angeordneten Kolben 19, mit einem auf Seiten einer Kolbenstange 21 angeordneten kolbenstangenseitigen Druckraum 20 und mit einem Zylinderraum 28. A hydraulic torque wrench comprises a piston-cylinder unit 18 with a piston 19 arranged in a cylinder 26, with a piston rod-side pressure chamber 20 arranged on the side of a piston rod 21 and with a cylinder space 28.
Sowohl der kolbenstangenseitige Druckraum 20 als auch der Zylinderraum 28 sind jeweils über Hydraulikleitungen, einer Hydraulikleitung Rücklauf 13, die in den kolbenstangenseitigen Druckraum 20 mündet, und einer Hydraulikleitung Vorlauf 14, die in den Zylinderraum mündet, mit einem Tank 10 verbunden. In dem Tank 10 ist eine ein- oder mehrstufige Pumpe 11 angeordnet, die durch einen Motor M betrieben wird. Die Pumpe 11 selbst und deren Motor M kann in der Hydraulikflüssigkeit zu Kühlungszwecken angeordnet sein. Both the piston rod-side pressure chamber 20 and the cylinder chamber 28 are each connected via hydraulic lines, a hydraulic line return 13, which opens into the piston rod side pressure chamber 20, and a hydraulic line flow 14, which opens into the cylinder chamber with a tank 10. In the tank 10, a single or multi-stage pump 11 is arranged, which is operated by a motor M. The pump 11 itself and its motor M can be arranged in the hydraulic fluid for cooling purposes.
Zwischen der Kolbenzylindereinheit und dem Tank 10 ist ein Proportionalventil 12 geschaltet, welches über eine elektrische Steuerleitung 27 von einer Steuereinrichtung 16 ansteuerbar ist. Die Steuereinrichtung 16 wiederum ist über eine elektrische Leitung oder auch via Funk von einer Fernsteuereinheit 31 einstellbar, das heißt es findet ein Datenaustausch zwischen der Steuereinrichtung 16 und der Fernsteuereinheit 31 statt. In der Hydraulikleitung Rücklauf 13 ist ein Mengenerfassungsmittel 15 angeordnet. Die Hydraulikleitung Vorlauf 14 weist ein Druckmessmittel 22 auf. Sowohl die Ausgangssignale des Mengenerfassungsmittels 15 als auch die Ausgangssignale des Druckmessmittels 22 werden der Steuereinrichtung 16 über elektrische Leitungen 17 und 23 zugeführt. Between the piston-cylinder unit and the tank 10, a proportional valve 12 is connected, which is controllable via an electrical control line 27 by a control device 16. The control device 16 in turn is adjustable via an electrical line or via radio from a remote control unit 31, that is, there is a data exchange between the controller 16 and the remote control unit 31 instead. In the hydraulic line return 13, a quantity detection means 15 is arranged. The hydraulic line flow 14 has a pressure measuring means 22. Both the output signals of the quantity detecting means 15 and the output signals of the pressure measuring means 22 are supplied to the control device 16 via electrical lines 17 and 23.
Die Bedienung der Schaltungsanordnung erfolgt von einer (nicht gezeigten) Bedienungsperson, die sich im Bereich der beispielsweise herzustellenden Schraubverbindung befindet. Diese Bedienungsperson kann mittels der Fernsteuereinheit 31 gewünschte Daten vorgeben, beispielsweise das Anzugsmoment der Schraubverbindung, die der Steuereinheit 16 zugeführt werden. Die Steuereinheit 16 berechnet in Abhängigkeit von dem mittels des The operation of the circuit arrangement is carried out by an operator (not shown) who is located in the region of the screw connection to be produced, for example. This operator can specify by means of the remote control unit 31 desired data, such as the tightening torque of the screw, which are supplied to the control unit 16. The control unit 16 calculates in dependence on the means of the
Druckmessmittels 22 erfassten Drucks und gegebenenfalls auch in Abhängigkeit von der mittels des Mengenerfassungsmittels 15 erfassten Rücklaufmenge des Fluids ein Ansteuersignal für das Proportionalventil 12. Pressure measuring means 22 detected pressure and optionally also in response to the detected by means of the quantity detection means 15 return amount of the fluid, a drive signal for the proportional valve 12th
Abhängig von diesem elektrischen Ansteuersignal verändert sich der Depending on this electrical drive signal changes the
Öffnungsquerschnitt und damit der Druck in der Hydrauiikleitung Vorlauf 14 und damit im Zylinderraum 28. Es ist an dieser Stelle zu bemerken, dass das Mengenerfassungsmittel 15 auch weggelassen werden kann. Für die Einstellung des Drucks genügt die Erfassung des Drucks mittels des Druckerfassungsmittels 22. Opening cross-section and thus the pressure in the Hydrauiikleitung flow 14 and thus in the cylinder chamber 28. It should be noted at this point that the quantity detection means 15 can also be omitted. For the setting of the pressure, the detection of the pressure by the pressure detecting means 22 is sufficient.
Das Proportionalventil 12 weist bei dieser Schaltungsanordnung zwei Funktionen auf. Zum einen übt es die Funktion einer Umsteuereinheit zwischen Vor- und Rücklauf aus, zum anderen dient es als Druckbegrenzungsmittel, um einen von einer Bedienungsperson mittels der Fernsteuereinheit 31 voreingestellten Druck einzustellen und zu halten. Hierdurch können auch Kriechvorgänge, die beim Herstellen von Schraubverbindungen, die mit einem sehr hohen Drehmoment beaufschlagt werden, kompensiert werden. Das Proportionalventil ist für sehr hohe Drücke ausgelegt, die bis zu 800 bar betragen können. The proportional valve 12 has two functions in this circuit arrangement. On the one hand, it performs the function of a reversing unit between flow and return, on the other hand, it serves as a pressure limiting means to set a preset by an operator by means of the remote control unit 31 pressure and hold. As a result, creeping processes which are compensated when producing screw connections which are subjected to a very high torque can also be compensated. The proportional valve is designed for very high pressures, which can be up to 800 bar.

Claims

Ansprüche claims
1. Schaltungsanordnung zum Betreiben eines hydraulischen Drehmoment- schraubers oder dergleichen mit einer Kolben-Zylinder-Einheit (18), die von einer Pumpe (1 1 ) mit einem vorgebbaren Druck ansteuerbar ist, dadurch gekennzeichnet, dass die Kolben-Zylinder-Einheit (18) von der Pumpe (1 1) über ein Proportionalventil (12) ansteuerbar ist, welches sowohl als Umsteuereinheit zwischen Vor- und Rücklauf als auch als Druckbegrenzungsventil wirkt. 1. Circuit arrangement for operating a hydraulic torque wrench or the like with a piston-cylinder unit (18) which can be controlled by a pump (1 1) with a predeterminable pressure, characterized in that the piston-cylinder unit (18 ) by the pump (1 1) via a proportional valve (12) can be controlled, which acts both as a reversing unit between flow and return as well as a pressure relief valve.
2. Schaltungsanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass das Proportionalventil (12) von einer Steuereinrichtung (16) ansteuerbar ist, der Signale eines im Vor-/Rücklauf angeordneten Mengenerfassungsmittels (15) und/oder eines Druckmessmittels (22) zuführbar sind. 2. A circuit arrangement according to claim 1, characterized in that the proportional valve (12) by a control device (16) is controllable, the signals of a forward / return flow rate detection means (15) and / or a pressure measuring means (22) can be fed.
3. Schaltungsanordnung nach Anspruch 2, dadurch gekennzeichnet, dass eine Einstellung der Steuereinrichtung (16) durch eine Bedienungsperson mittels einer drahtgebundenen oder drahtlos mit der Steuereinrichtung (16) kommunizierenden Fernsteuereinheit (31) erfolgt. 3. A circuit arrangement according to claim 2, characterized in that an adjustment of the control device (16) by an operator by means of a wired or wirelessly with the control device (16) communicating remote control unit (31).
4. Schaltungsanordnung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Ansteuerung des Proportionalventils (12) in Abhängigkeit von den Signalen des Mengenerfassungsmittels (15) und/oder des Druckmessmittels (22) erfolgt. 4. Circuit arrangement according to one of the preceding claims, characterized in that the control of the proportional valve (12) in response to the signals of the quantity detection means (15) and / or the pressure-measuring means (22).
EP11752085.8A 2010-05-11 2011-05-06 Circuit arrangement for operating a torque wrench or similar Active EP2569125B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010020258A DE102010020258A1 (en) 2010-05-11 2010-05-11 Circuit arrangement for operating a torque screwdriver or the like
PCT/DE2011/001043 WO2011150909A1 (en) 2010-05-11 2011-05-06 Circuit arrangement for operating a torque wrench or similar

Publications (2)

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EP2569125A1 true EP2569125A1 (en) 2013-03-20
EP2569125B1 EP2569125B1 (en) 2019-04-24

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US (1) US9193049B2 (en)
EP (1) EP2569125B1 (en)
CN (1) CN102985225B (en)
BR (1) BR112012028775A2 (en)
CA (1) CA2800344A1 (en)
DE (1) DE102010020258A1 (en)
RU (1) RU2557859C2 (en)
WO (1) WO2011150909A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2017060777A2 (en) * 2015-10-05 2017-04-13 HYTORC Division Unex Corporation Apparatus for tightening threaded fasteners
EP4276310A3 (en) 2017-05-16 2024-01-17 Enerpac Tool Group Corp. Hydraulic pump
EP3653888B1 (en) * 2018-11-13 2023-01-25 Enerpac Tool Group Corp. Hydraulic power system and method for controlling same

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JP2714449B2 (en) * 1989-08-08 1998-02-16 株式会社日立製作所 Variable speed pump system
RU2037392C1 (en) * 1991-03-19 1995-06-19 Малое предприятие "Мехсборка" Method and device for controlling tightening of threaded joints
US5668328A (en) 1996-07-17 1997-09-16 Applied Power Inc. Method and apparatus for hydraulically tightening threaded fasteners
DE19813900A1 (en) 1998-03-28 1999-09-30 Frank Hohmann Hydraulically operated power screwdriver and method for its production
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DE102004058338A1 (en) 2004-12-02 2006-06-08 Werner, Karl-Heinz, Dipl.-Ing. Screwing process control device e.g. for servo screw driver, has screwing system provided from hydraulically operated force nut and piston cylinder unit with unit connected to motor propelled pump
DE102004059859B3 (en) * 2004-12-11 2006-08-10 Junkers, Holger, Dipl.-Ing.(FH) Motor-operated hydraulic pump for power screwdriver, has pressure measuring sensor interface detecting pressure values at screwdriver or at pump and transferring values to signal preprocessing unit for controlling pump and/or screwdriver
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See references of WO2011150909A1 *

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CA2800344A1 (en) 2011-12-08
CN102985225A (en) 2013-03-20
RU2012153248A (en) 2014-06-20
CN102985225B (en) 2015-11-25
WO2011150909A1 (en) 2011-12-08
RU2557859C2 (en) 2015-07-27
BR112012028775A2 (en) 2016-07-19
EP2569125B1 (en) 2019-04-24
US20130125715A1 (en) 2013-05-23
US9193049B2 (en) 2015-11-24
DE102010020258A1 (en) 2011-11-17

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