EP2118486A1 - Hydraulic unit for a hydraulic power screwdriver - Google Patents

Hydraulic unit for a hydraulic power screwdriver

Info

Publication number
EP2118486A1
EP2118486A1 EP08708205A EP08708205A EP2118486A1 EP 2118486 A1 EP2118486 A1 EP 2118486A1 EP 08708205 A EP08708205 A EP 08708205A EP 08708205 A EP08708205 A EP 08708205A EP 2118486 A1 EP2118486 A1 EP 2118486A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
motor
control
unit
hydraulic unit
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
EP08708205A
Other languages
German (de)
French (fr)
Other versions
EP2118486B1 (en
Inventor
Bernd Thelen
Ulf Sittig
Günter Andres
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.)
Wagner Vermoegensverwaltungs GmbH and Co KG
Original Assignee
Wagner Paul-Heinz
Wagner Vermoegensverwaltungs GmbH and Co KG
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 Wagner Paul-Heinz, Wagner Vermoegensverwaltungs GmbH and Co KG filed Critical Wagner Paul-Heinz
Publication of EP2118486A1 publication Critical patent/EP2118486A1/en
Application granted granted Critical
Publication of EP2118486B1 publication Critical patent/EP2118486B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air

Definitions

  • the invention relates to a hydraulic unit for supplying oil to a hydraulic power wrench, with an oil-containing reservoir in which a motor is included as a submersible motor, driven by the motor pump and a control device for controlling the stroke direction reversal of the power wrench in response to the pressure at the output of the hydraulic unit.
  • a hydraulic unit of this type is described in WO 2006/103199 A1 (Wagner).
  • This hydraulic unit has a reservoir, in which a submersible motor is arranged, which is immersed in the oil contained in the reservoir.
  • the submersible motor is housing-less, so that the oil allmonisteiie the engine and also fills the gap between stator and rotor.
  • the engine drives a multiple-piston pump with distributed individual pumps.
  • the individual pumps are cyclically actuated via an eccentric located on the motor shaft.
  • Such a pump has a star-shaped construction and is arranged in the cylindrical reservoir in a cross-sectional plane.
  • the hydraulic unit has on the housing of the reservoir to a motor control, which is contained in a separate device housing.
  • the invention has for its object to provide a hydraulic unit for a hydraulic power wrench, which is optimized in terms of the modes.
  • the hydraulic unit according to the invention is defined by the claim 1. It has within the reservoir as a motor to a pneumatic motor, which is powered by an external Druck Kunststoff Kunststoffquelie. In contrast to a Eiektromotor flow in a pneumatic motor no electric currents, so that no sparks through slip rings u. Like. May arise and no overheated by current flow wires.
  • the pneumatic motor works with compressed air so that no additional flammable substances are introduced into the reservoir.
  • the belonging to the hydraulic unit control is carried out electrically opposite. Seed is preferably housed in an explosion-proof own device housing.
  • the concept of the invention provides a Bipartite:
  • the motor as a consumer operating at high current levels, is replaced by a pneumatic motor free of electrical currents, while the control or "intelligence" embodied in microelectronics remains electric.
  • This split solution results in a relatively inexpensive one
  • a pneumatic solution for the control unit would have the disadvantage of a high weight and an increased susceptibility to interference in the rough construction site application
  • functions such as automatic end position control, torque-rotation angle screwdriving methods and documentation of the screwing parameters can be realized, as described in DE 102 22 159 and 10 2004 017979.
  • the immersed in the Hydraultköl hydraulic motor causes cooling of the hydraulic oil by relaxing the compressed air leaving the engine.
  • the hydraulic oil prevents icing of the pneumatic motor.
  • the control device is connected via an electrical line to an electrically controlled driver valve, which controls the supply of compressed air to the lifting direction reversal of the piston of the power wrench causing the main valve.
  • the driver valve causes a power amplification of the low-power signals of the electronic control.
  • high power consumption would result solely through the main valve with the result that additional explosion protection measures would be required.
  • An advantageous embodiment of the invention provides that the control unit includes a battery for electrical power supply of the electronic control.
  • the accumulator can provide a low operating voltage of 12 or 24 volts, which is sufficient for the operation of the controller.
  • the accumulator increases the mobility of the hydraulic unit.
  • the hydraulic unit only requires a compressed air connection.
  • the compressed air can be supplied from a remote compressed air source and fed through a flexible hose.
  • a sudieitung is not required in the compressed air system.
  • Particularly favorable is the combination of the accumulator power supply with an electrically controlled pneumatic driver valve. As a result, the accumulator is charged with relatively low load currents.
  • the pneumatic pressure system has a low pressure of the order of 10 bar, while the hydraulic system of a power wrench works with several 100 bar.
  • the hydraulic unit according to the invention is suitable for use in explosive environments, for example, for pipelines for oil or gas or for use in the chemical and mining industries.
  • the electrical part is designed in explosion-proof design according to Atex guidelines. This means a corresponding encapsulation of the housing and the cable bushings.
  • Fig. 1 is a side view of the hydraulic unit, partially cut and Fig. 2 is a diagram of the structure of the hydraulic unit.
  • the hydraulic unit has a generally cylindrical container 10, which encloses the reservoir 11 for the hydraulic medium.
  • the container 10 has support feet 12, with which it can be placed on the ground.
  • the support feet 12 protrude from the peripheral wall of the container.
  • hose connections 13 and 14 At the front end of the container there are hydraulic connections 13 and 14 to which hoses (not shown) can be connected leading to a hydraulic power wrench.
  • One hose connection 13 is the pressure connection and the other ski connection 14 is the return connection.
  • the hydraulic pressure available from the hydraulic unit is several hundred bars.
  • a multi-piston pump 15 is arranged, which is formed in the same manner as the multiple-piston pump, which is described in WO 2006/103199 Al.
  • the individual pump segments which are arranged in a star shape around a shaft, are cyclically driven by an eccentric 16 seated on the shaft, so that the pump segments successively suck in hydraulic oil and eject it at high pressure.
  • the drive of the multiple piston pump 15 is effected by a motor 18 which is arranged in the reservoir 11.
  • the motor 18 is a pneumatic motor with an oil-tight housing.
  • the motor 18 drives a shaft 19 which drives the eccentric 16.
  • the motor 18 is connected to a hose line with a compressed air source.
  • the container 10 has an oil filler neck 20, which can be closed with a screw 21.
  • a pressure gauge 22 which indicates the pressure in the hydraulic pressure line. Furthermore, this is pneumatic actuated hydraulic main valve 23 attached to the container 10, which controls the stroke direction reversal of the power wrench.
  • the main inventory! 23 is pneumatically actuated by the driver valve 26.
  • the compressed air line which is connected to a compressed air source (not shown), supplies the driver valve 26 and the pneumatic motor 18. From the driver valve 26, a pneumatic control line leads to the main valve 23.
  • a pneumatic treatment unit 25 which contains filters, water, oiler and pressure reducer and supplies the compressed air to the main valve 23 and the pneumatic motor.
  • the electronic control unit 30 is mounted, which is housed in a housing 31 protected from explosion.
  • the controller includes the required hardware and software. It is connected to various sensors, including in particular pressure sensors that measure the pressure in the hydraulic pressure line. Depending on the level of this pressure, the load acting on the power converter can be determined.
  • the power schauber has a reciprocally driven Koiben on. When this reaches an end position within the hydraulic cylinder, the pressure rises steeply. This steep increase in pressure is detected by the controller and used to reverse the direction. The direction reversal is effected by the main valve 23, which switches the hydraulic connections 13, 14 mutually between pressure and return. The control of the main valve 23 via the driver valve 26 by the controller 30. An electrically actuated valve is not present in the oil supply for the power wrench.
  • the control unit 30 is additionally connected via a cable 35 to a remote control 36.
  • the remote control to be held in hand has manually operated buttons with which to select between forward stroke and return stroke can be.
  • the remote control can be switched to automatic reverse stroke direction.
  • the remote control 36 is connected to the electrical control, which in turn is the main event! 23 actuated accordingly.
  • the controller 30 For powering the controller, the controller 30 includes an accumulator, i. h, a rechargeable battery. This serves to maintain the function of data processing and control as well as to control the Kleinventiis 23rd

Abstract

The invention relates to an hydraulic aggregate comprising a reservoir (11) for hydraulic oil in a container (10). A pump (15) driven by a motor (18) is arranged in the reservoir (11). The motor (18) is a pneumatic motor. An electric control device (30) for controlling a main valve (23) is mounted on the container (10). The main valve causes the inversion of the stroke direction of the hydraulic connections (13, 14). The division into pneumatics and low power electronics leads to an explosion-proof embodiment of low weight and little technical complexity.

Description

Hvdraulikagqreqat für hydraulische Kraftsch rauber Hvdraulikagqreqat for hydraulic power wrench
Die Erfindung betrifft ein Hydraulikaggregat zur Lieferung von Öl an einen hydraulischen Kraftschrauber, mit einem Öl enthaltenden Reservoir in dem ein Motor als Tauchmotor enthalten ist, einer von dem Motor angetriebenen Pumpe und einem Steuergerät zur Steuerung der Hubrichtungsumkehr des Kraftschraubers in Abhängigkeit von dem Druck am Ausgang des Hydraulikaggregates.The invention relates to a hydraulic unit for supplying oil to a hydraulic power wrench, with an oil-containing reservoir in which a motor is included as a submersible motor, driven by the motor pump and a control device for controlling the stroke direction reversal of the power wrench in response to the pressure at the output of the hydraulic unit.
Ein Hydraulikaggregat dieser Art ist beschrieben in WO 2006/103199 Al (Wagner). Dieses Hydraulikaggregat weist ein Reservoir auf, in welchem ein Tauchmotor angeordnet ist, der in das im Reservoir enthaltene Öl eingetaucht ist. Der Tauchmotor ist gehäuselos, so dass das Öl alle Funktionsteiie des Motors erreichen kann und auch den Spait zwischen Stator und Rotor ausfüllt. Der Motor treibt eine Mehrfach-Koibenpumpe mit verteilt angeordneten Einzelpumpen. Die Einzelpumpen werden über einen auf der Motorwelle sitzenden Exzenter zyklisch betätigt. Eine derartige Pumpe hat einen sternförmigen Aufbau und sie ist in dem zylindrischen Reservoir in einer Querschnittsebene angeordnet. Das Hydraulikaggregat weist auf dem Gehäuse des Reservoirs eine Motorsteuerung auf, die in einem separaten Gerätegehäuse enthalten ist.A hydraulic unit of this type is described in WO 2006/103199 A1 (Wagner). This hydraulic unit has a reservoir, in which a submersible motor is arranged, which is immersed in the oil contained in the reservoir. The submersible motor is housing-less, so that the oil all Funktionsteiie the engine and also fills the gap between stator and rotor. The engine drives a multiple-piston pump with distributed individual pumps. The individual pumps are cyclically actuated via an eccentric located on the motor shaft. Such a pump has a star-shaped construction and is arranged in the cylindrical reservoir in a cross-sectional plane. The hydraulic unit has on the housing of the reservoir to a motor control, which is contained in a separate device housing.
Die üblichen Hydraulikaggregate für Kraftsch rauber werden in einer Umgebung ohne besondere Explosionsgefährdung eingesetzt. Daher kann für den Antrieb der Mehrfach-Koibenpumpe ein Elektromotor eingesetzt werden. Bei Hydrauiikaggregaten, die in einer explosionsgefährdeten Umgebung laufen müssen, ist das bekannte Hydrautikaggregat, das einen gehäuselosen Motor enthält, nicht geeignet. Durch den Elektromotor könnte im Innern des Reservoirs ein Brand des dort vorhandenen Öls auftreten. Eine expiosionsgeschützte Kapselung würde eine erhebliche Volumen- und Gewichtssteigerung erfordern.The usual hydraulic power packs for power washers are used in an environment without any special risk of explosion. Therefore, an electric motor can be used to drive the multiple-Koibenpumpe. For Hydrauiikaggregaten that must run in a hazardous environment, the known Hydrautikaggregat that contains a housing-less motor, not suitable. By the electric motor could occur inside the reservoir, a fire of the existing oil there. An explosion-proof encapsulation would require a significant increase in volume and weight.
Der Erfindung liegt die Aufgabe zugrunde, ein Hydraulikaggregat für einen hydraulischen Kraftschrauber zu schaffen, das hinsichtlich der Betriebsarten optimiert ist.The invention has for its object to provide a hydraulic unit for a hydraulic power wrench, which is optimized in terms of the modes.
Das erfindungsgemäße Hydraulikaggregat ist durch den Anspruch 1 definiert. Es weist innerhalb des Reservoirs als Motor einen Pneumatikmotor auf, der von einer externen Druckluftquelie versorgt wird. Im Gegensatz zu einem Eiektromotor fließen in einem Pneumatikmotor keine elektrischen Ströme, so dass keine Funken durch Schleifringe u. dgl. entstehen können und auch keine durch Stromfluss überhitzten Drähte. Der Pneumatikmotor arbeitet mit Druckluft, so dass keine zusätzlichen brennbaren Substanzen in das Reservoir eingeführt werden. Die zu dem Hydraulikaggregat gehörende Steuerung ist dem gegenüber elektrisch ausgeführt. Säe ist vorzugsweise in einem explosionsgeschützten eigenen Gerätegehäuse untergebracht. Das Konzept der Erfindung sieht eine Zweiteilung vor: Der Motor als ein Verbraucher, der mit hohen Stromstärken arbeitet, wird ersetzt durch einen von elektrischen Strömen freien Pneumatikmotor, während die Steuerung oder „Intelligenz", die in Mikroelektronik ausgeführt ist, elektrisch bleibt. Diese gesplittete Lösung führt zu einem relativ kostengünstigen und leichtgewichtigen Hydraulikaggregat, das leicht an den jeweiligen Einsatzort der Kraftschrauber getragen werden kann. Eine pneumatische Lösung für das Steuergerät hätte demgegenüber den Nachteil eines hohen Gewichts, und einer erhöhten Störanfälligkeit in dem rauen Baustelleneinsatz. Durch die Erfindung wird eine hohe Schaltgenauigkeit bei relativ geringem Aufwand erreicht. Dadurch, dass das Steuergerät elektronisch aufgebaut ist, können Funktionen wie automatische Endlagensteuerung, Drehmoment-Drehwinkel-Schraubverfahren sowie Dokumentation der Verschraubungsparameter realisiert werden, wie in DE 102 22 159 und 10 2004 017979 beschrieben.The hydraulic unit according to the invention is defined by the claim 1. It has within the reservoir as a motor to a pneumatic motor, which is powered by an external Druckluftquelie. In contrast to a Eiektromotor flow in a pneumatic motor no electric currents, so that no sparks through slip rings u. Like. May arise and no overheated by current flow wires. The pneumatic motor works with compressed air so that no additional flammable substances are introduced into the reservoir. The belonging to the hydraulic unit control is carried out electrically opposite. Seed is preferably housed in an explosion-proof own device housing. The concept of the invention provides a Bipartite: The motor, as a consumer operating at high current levels, is replaced by a pneumatic motor free of electrical currents, while the control or "intelligence" embodied in microelectronics remains electric. "This split solution results in a relatively inexpensive one By contrast, a pneumatic solution for the control unit would have the disadvantage of a high weight and an increased susceptibility to interference in the rough construction site application As a result of the fact that the control unit is constructed electronically, functions such as automatic end position control, torque-rotation angle screwdriving methods and documentation of the screwing parameters can be realized, as described in DE 102 22 159 and 10 2004 017979.
Der in das Hydraultköl eingetauchte Hydraulikmotor bewirkt eine Kühlung des Hydrauliköls durch Entspannung der den Motor verlassenden Druckluft. Andererseits verhindert das Hydrauliköl ein Vereisen des Pneumatikmotors. Somit besteht eine thermisch vorteilhafte Interaktion zwischen Pneumatikmotor und hydraulischem Pumpenkreislauf.The immersed in the Hydraultköl hydraulic motor causes cooling of the hydraulic oil by relaxing the compressed air leaving the engine. On the other hand, the hydraulic oil prevents icing of the pneumatic motor. Thus, there is a thermally advantageous interaction between the pneumatic motor and the hydraulic pump circuit.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist das Steuergerät über eine elektrische Leitung mit einem elektrisch gesteuerten Treiberventil verbunden, das die Druckluftzufuhr zu einem die Hubrichtungsumkehr des Kolbens des Kraftschraubers bewirkenden Hauptventil steuert. Das Treiberventii bewirkt eine Leistungsverstärkung der leistungsschwachen Signale der elektronischen Steuerung. Bei einer elektrischen Steuerung des Hauptventiis würde sich ein hoher Stromverbrauch allein durch das Hauptventil ergeben mit der Folge, dass zusätzliche Explosionsschutzmaßnahmen erforderlich wären. Eine vorteilhafte Ausführungsform der Erfindung sieht vor, dass das Steuergerät einen Akkumulator zur elektrischen Stromversorgung der elektronischen Steuerung enthält. Somit kommt das Hydraulikaggregat ohne Netzanschiuss aus. Der Akkumulator kann eine niedrige Betriebsspannung von 12 oder 24 Volt liefern, die für den Betrieb der Steuerung ausreicht. Durch den Akkumulator wird die Mobilität des Hydraulikaggregates erhöht. Das Hydrauiikaggregat benötigt lediglich einen Druckluftanschluss. Die Druckluft kann von einer entfernt angeordneten Druckluftquelle geliefert und über einen flexiblen Schlauch zugeführt werden. Eine Rückieitung ist in dem Druckluftsystem nicht erforderlich. Besonders günstig ist die Kombination der Akkumulator-Stromversorgung mit einem elektrisch gesteuerten pneumatischen Treiberventil. Dadurch wird der Akkumulator mit relativ geringen Verbraucherströmen belastet. Das pneumatische Drucksystem hat einen niedrigen Druck in der Größenordnung von 10 bar, während das Hydrauliksystem eines Kraftschraubers mit mehreren 100 bar arbeitet.According to a preferred embodiment of the invention, the control device is connected via an electrical line to an electrically controlled driver valve, which controls the supply of compressed air to the lifting direction reversal of the piston of the power wrench causing the main valve. The driver valve causes a power amplification of the low-power signals of the electronic control. In an electrical control of the Hauptventiis high power consumption would result solely through the main valve with the result that additional explosion protection measures would be required. An advantageous embodiment of the invention provides that the control unit includes a battery for electrical power supply of the electronic control. Thus, the hydraulic unit comes without Netzanschiuss. The accumulator can provide a low operating voltage of 12 or 24 volts, which is sufficient for the operation of the controller. The accumulator increases the mobility of the hydraulic unit. The hydraulic unit only requires a compressed air connection. The compressed air can be supplied from a remote compressed air source and fed through a flexible hose. A Rückieitung is not required in the compressed air system. Particularly favorable is the combination of the accumulator power supply with an electrically controlled pneumatic driver valve. As a result, the accumulator is charged with relatively low load currents. The pneumatic pressure system has a low pressure of the order of 10 bar, while the hydraulic system of a power wrench works with several 100 bar.
Das erfindungsgemäße Hydraulikaggregat eignet sich für Einsätze in expiosionsgefährdeter Umgebung, beispielsweise für Pipelines für Öl oder Gas oder auch für Einsätze in der chemischen Industrie und im Bergbau. Der elektrische Teil ist in explosionsgeschützter Bauart nach Atex-Richtlinien ausgeführt. Dies bedeutet eine entsprechende Kapselung der Gehäuse und der Leitungsdurchführungen.The hydraulic unit according to the invention is suitable for use in explosive environments, for example, for pipelines for oil or gas or for use in the chemical and mining industries. The electrical part is designed in explosion-proof design according to Atex guidelines. This means a corresponding encapsulation of the housing and the cable bushings.
Im Folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained in more detail with reference to the drawings.
Es zeigen :Show it :
Fig. 1 eine Seitenansicht des Hydraulikaggregats, teilweise geschnitten und Fig. 2 ein Diagramm der Struktur des Hydraulikaggregates.Fig. 1 is a side view of the hydraulic unit, partially cut and Fig. 2 is a diagram of the structure of the hydraulic unit.
Das Hydraulikaggregat weist einen generell zylindrischen Behälter 10 auf, der das Reservoir 11 für das Hydrauiikmedium umschließt. Der Behälter 10 weist Tragfüße 12 auf, mit denen er auf den Boden gestellt werden kann. Die Tragfüße 12 stehen von der Umfangswand des Behälters ab.The hydraulic unit has a generally cylindrical container 10, which encloses the reservoir 11 for the hydraulic medium. The container 10 has support feet 12, with which it can be placed on the ground. The support feet 12 protrude from the peripheral wall of the container.
Am vorderen Behälterende befinden sich Hydraulikanschlüsse 13 und 14, mit denen (nicht dargestellte) Schläuche verbunden werden können, die zu einem hydraulischen Kraftschrauber führen. Der eine Schlauchanschluss 13 ist der Druckanschluss und der andere Schiauchanschluss 14 ist der Rücklaufanschluss. Der von dem Hydraulikaggregat lieferbare hydraulische Druck beträgt mehrere hundert bar.At the front end of the container there are hydraulic connections 13 and 14 to which hoses (not shown) can be connected leading to a hydraulic power wrench. One hose connection 13 is the pressure connection and the other ski connection 14 is the return connection. The hydraulic pressure available from the hydraulic unit is several hundred bars.
In dem Behälter 10 ist eine Mehrfach-Kolbenpumpe 15 angeordnet, die in gleicher Weise ausgebildet ist, wie die Mehrfach-Kolbenpumpe, die in WO 2006/103199 Al beschrieben ist. Die einzelnen Pumpensegmente, die sternförmig um eine Welle angeordnet sind, werden von einem auf der Welle sitzenden Exzenter 16 zyklisch angetrieben, so dass die Pumpensegmente nacheinander Hydrauliköl ansaugen und mit hohem Druck ausstoßen. Der Antrieb der Mehrfachkolbenpumpe 15 erfolgt durch einen Motor 18, der in dem Reservoir 11 angeordnet ist. Der Motor 18 ist ein Pneumatikmotor mit einem öldichten Gehäuse. Der Motor 18 treibt eine Welle 19, die den Exzenter 16 antreibt. Der Motor 18 ist mit einer Schlauchleitung mit einer Druckluftquelle verbunden.In the container 10, a multi-piston pump 15 is arranged, which is formed in the same manner as the multiple-piston pump, which is described in WO 2006/103199 Al. The individual pump segments, which are arranged in a star shape around a shaft, are cyclically driven by an eccentric 16 seated on the shaft, so that the pump segments successively suck in hydraulic oil and eject it at high pressure. The drive of the multiple piston pump 15 is effected by a motor 18 which is arranged in the reservoir 11. The motor 18 is a pneumatic motor with an oil-tight housing. The motor 18 drives a shaft 19 which drives the eccentric 16. The motor 18 is connected to a hose line with a compressed air source.
Der Behälter 10 weist einen Öleinfüilstutzen 20 auf, der mit einem Schraubdeckel 21 verschlossen werden kann.The container 10 has an oil filler neck 20, which can be closed with a screw 21.
An der Vorderseite des Behälters 10 befindet sich ein Manometer 22, das den Druck in der hydraulischen Druckleitung anzeigt. Ferner ist das pneumatisch betätigte hydraulische Hauptventil 23 an dem Behälter 10 befestigt, welches die Hubrichtungsumkehr des Kraftschraubers steuert. Das Hauptventi! 23 wird pneumatisch von dem Treiberventil 26 betätigt. Die Druckluftleitung, die an eine (nicht dargesteilte) Druckluftquelle angeschlossen ist, versorgt das Treiberventil 26 und den Pneumatikmotor 18. Vom Treiberventii 26 führt eine pneumatische Steuerleitung zum Hauptventil 23.At the front of the container 10 is a pressure gauge 22, which indicates the pressure in the hydraulic pressure line. Furthermore, this is pneumatic actuated hydraulic main valve 23 attached to the container 10, which controls the stroke direction reversal of the power wrench. The main inventory! 23 is pneumatically actuated by the driver valve 26. The compressed air line, which is connected to a compressed air source (not shown), supplies the driver valve 26 and the pneumatic motor 18. From the driver valve 26, a pneumatic control line leads to the main valve 23.
An der rückwärtigen Stirnwand des Behälters 10 ist eine zur Pneumatik gehörende Aufbereitungseinheit 25 befestigt, die Filter, Wasserabscheider, Öler und Druckminderer enthält und die Druckluft an das Hauptventil 23 und den Pneumatikmotor liefert.At the rear end wall of the container 10, a pneumatic treatment unit 25 is attached, which contains filters, water, oiler and pressure reducer and supplies the compressed air to the main valve 23 and the pneumatic motor.
Auf der Oberseite des Behälters 10 ist das elektronische Steuergerät 30 befestigt, das in einem explosionsgeschützt gekapselten Gehäuse 31 untergebracht ist. Die Steuerung umfasst die erforderliche Hardware und Software. Sie ist mit verschiedenen Sensoren verbunden, wozu insbesondere auch Drucksensoren gehören, die den Druck in der hydraulischen Druckleitung messen. In Abhängigkeit von der Höhe dieses Druckes kann die auf den Kraftsch rauber wirkende Last bestimmt werden. Der Kraftsch rauber weist einen hin- und hergehend angetriebenen Koiben auf. Wenn dieser innerhalb des Hydraulikzylinders eine Endlage erreicht, steigt der Druck steil an. Dieser steile zeitliche Druckanstieg wird von der Steuerung erkannt und für die Richtungsumkehr benutzt. Die Richtungsumkehr wird durch das Hauptventil 23 bewirkt, das die Hydraulikanschlüsse 13, 14 wechselseitig zwischen Druck und Rücklauf umschaltet. Die Steuerung des Hauptventils 23 erfolgt über das Treiberventil 26 durch das Steuergerät 30. Ein elektrisch betätigbares Ventil ist in der Ölversorgung für den Kraftschrauber nicht vorhanden.On the top of the container 10, the electronic control unit 30 is mounted, which is housed in a housing 31 protected from explosion. The controller includes the required hardware and software. It is connected to various sensors, including in particular pressure sensors that measure the pressure in the hydraulic pressure line. Depending on the level of this pressure, the load acting on the power converter can be determined. The power schauber has a reciprocally driven Koiben on. When this reaches an end position within the hydraulic cylinder, the pressure rises steeply. This steep increase in pressure is detected by the controller and used to reverse the direction. The direction reversal is effected by the main valve 23, which switches the hydraulic connections 13, 14 mutually between pressure and return. The control of the main valve 23 via the driver valve 26 by the controller 30. An electrically actuated valve is not present in the oil supply for the power wrench.
Das Steuergerät 30 ist zusätzlich über ein Kabel 35 mit einer Fernbedienung 36 verbunden. Die Fernbedienung, die in der Hand zu halten ist, weist manuell zu betätigende Tasten auf, mit denen zwischen Vorhub und Rückhub ausgewählt werden kann. Außerdem kann an der Fernbedienung auf automatische Hubrichtungsumkehr geschaltet werden. Die Fernbedienung 36 ist mit der elektrischen Steuerung verbunden, die ihrerseits das Hauptventt! 23 entsprechend betätigt.The control unit 30 is additionally connected via a cable 35 to a remote control 36. The remote control to be held in hand has manually operated buttons with which to select between forward stroke and return stroke can be. In addition, the remote control can be switched to automatic reverse stroke direction. The remote control 36 is connected to the electrical control, which in turn is the main event! 23 actuated accordingly.
Zur Energieversorgung der Steuerung enthält das Steuergerät 30 einen Akkumulator, d. h, eine wiederaufladbare Batterie. Diese dient zur Aufrechterhaltung der Funktion der Datenverarbeitung und -Steuerung sowie auch zur Ansteuerung des Hauptventiis 23.For powering the controller, the controller 30 includes an accumulator, i. h, a rechargeable battery. This serves to maintain the function of data processing and control as well as to control the Hauptventiis 23rd
Die Aufteilung der einzelnen Komponenten in Hydraulik, Pneumatik und Elektrik ist in Figur 2 dargestellt. Elektrisch ist alles, was mit der Steuerung zu tun hat, also sowohl die Sensorik 40 als auch die Fernbedienung 36. Pneumatisch betätigt sind dagegen der Pneumatikmotor 18 und das Hauptventil 23. The distribution of the individual components in hydraulics, pneumatics and electrics is shown in FIG. Electric is everything that has to do with the controller, so both the sensor 40 and the remote control 36. Pneumatically actuated, however, the pneumatic motor 18 and the main valve 23rd

Claims

Patentansprüche claims
1. Hydraulikaggregat zur Lieferung von Öl an einen hydraulischen Kraftschrauber, mit einem Öl enthaltenden Reservoir (11), in dem ein Motor (18) als Tauchmotor enthalten ist, einer von dem Motor (18) angetriebenen Pumpe (15) und einem Steuergerät (30) zur Steuerung der Hubrichtungsumkehr des Kraftschraubers In Abhängigkeit von dem Druck am Ausgang des Hydraulikaggregates,A hydraulic power unit for supplying oil to a hydraulic power wrench, comprising an oil reservoir (11) containing a motor (18) as a submersible motor, a pump (15) driven by the motor (18), and a controller (30 ) to control the reversing direction of the power screwdriver Depending on the pressure at the output of the hydraulic unit,
d a d u r c h g e k e n n z e i c h n e t,characterized,
dass der Motor (18) ein Pneumatikmotor ist und dass das Steuergerät (30) als elektronische Steuerung ausgeführt ist.that the motor (18) is a pneumatic motor and that the control device (30) is designed as an electronic control.
2. Hydrauiikaggregat nach Anspruch 1, dadurch gekennzeichnet, dass das Steuergerät (30) in einem explosionsgeschützten Gerätegehäuse (31) untergebracht ist.2. Hydrauiikaggregat according to claim 1, characterized in that the control unit (30) is housed in an explosion-proof device housing (31).
3. Hydraulikaggregat nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Steuergerät (30) über eine elektrische Leitung mit einem elektrisch gesteuerten Treiberventil (26) verbunden ist, das die Druckluftzufuhr zu einem die Hubrichtungsumkehr bewirkenden Hauptventil (23) steuert.3. Hydraulic unit according to claim 1 or 2, characterized in that the control device (30) via an electrical line with an electrically controlled driver valve (26) is connected, which controls the supply of compressed air to the lifting direction reversal causing the main valve (23).
4. Hydraulikaggregat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Steuergerät (30) einen Akkumulator zur elektrischen Stromversorgung der elektrischen Steuerung enthält. 4. Hydraulic unit according to one of claims 1 to 3, characterized in that the control device (30) includes a battery for electrical power supply to the electrical control.
EP08708205.3A 2007-02-02 2008-01-25 Hydraulic unit for a hydraulic power screwdriver Active EP2118486B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202007001537U DE202007001537U1 (en) 2007-02-02 2007-02-02 Hydraulic power unit for hydraulic power screws
PCT/EP2008/050877 WO2008092808A1 (en) 2007-02-02 2008-01-25 Hydraulic unit for a hydraulic power screwdriver

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EP2118486A1 true EP2118486A1 (en) 2009-11-18
EP2118486B1 EP2118486B1 (en) 2015-07-22

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EP (1) EP2118486B1 (en)
JP (1) JP5346817B2 (en)
DE (1) DE202007001537U1 (en)
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Also Published As

Publication number Publication date
US8347980B2 (en) 2013-01-08
EP2118486B1 (en) 2015-07-22
JP5346817B2 (en) 2013-11-20
DE202007001537U1 (en) 2008-06-19
US20100170689A1 (en) 2010-07-08
JP2010518326A (en) 2010-05-27
WO2008092808A1 (en) 2008-08-07

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