EP2593679B1 - Hydraulic assembly - Google Patents

Hydraulic assembly Download PDF

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Publication number
EP2593679B1
EP2593679B1 EP11730221.6A EP11730221A EP2593679B1 EP 2593679 B1 EP2593679 B1 EP 2593679B1 EP 11730221 A EP11730221 A EP 11730221A EP 2593679 B1 EP2593679 B1 EP 2593679B1
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EP
European Patent Office
Prior art keywords
pressure
electric motor
hydraulic assembly
pivot angle
assembly according
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EP11730221.6A
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German (de)
French (fr)
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EP2593679A2 (en
Inventor
Stefan Arns
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1201—Rotational speed of the axis
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1204—Position of a rotating inclined plate
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1204—Position of a rotating inclined plate
    • F04B2201/12041—Angular position
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1205—Position of a non-rotating inclined plate
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1205—Position of a non-rotating inclined plate
    • F04B2201/12051—Angular position
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/03—Pressure in the compression chamber
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/04—Pressure in the outlet chamber
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet

Definitions

  • the invention relates to a hydraulic unit according to the preamble of patent claim 1 and a method for operating a hydraulic unit.
  • the publication DE 10 2007 007 005 A1 shows in Figure 3, a hydraulic unit for supplying a consumer, in which a pump is driven by an adjustable electric motor.
  • the pump is a variable displacement pump.
  • a hydromechanical controller for a swivel angle of the variable displacement pump and a controller for the engine speed are provided.
  • variable-displacement pump pivots back. In this case, the torque of the hydraulic unit or the electric motor is lowered, resulting in energy savings.
  • the invention is based on the object to provide a hydraulic unit whose efficiency is further improved during partial load operation.
  • the hydraulic unit according to the invention has a controllable electric motor and a hydrostatic variable displacement pump which can be coupled thereto and whose pivoting angle can be set by means of a hydromechanical adjusting device.
  • the swivel angle can be detected via a swivel angle sensor and a working pressure of the variable displacement pump via a pressure sensor.
  • a rotational speed of the electric motor is controllable in dependence on the swivel angle sensor and the pressure sensor.
  • the solution for retrofitting existing systems is advantageous because interfaces for plant control, power supply and hydraulics can be used unchanged.
  • the rotational speed of the electric motor is controllable via a frequency converter.
  • the pump can be easily switched off in the event of routine interruptions (repair, tool change, break), which leads to further energy savings.
  • a frequency-controlled superordinate programmable logic controller is provided which is connected to the swivel angle sensor and to the pressure sensor. This can control the frequency converter.
  • the hydromechanical adjusting device is a pressure regulator or a combined pressure-flow regulator.
  • the electric motor is an asynchronous motor, in particular a cost-effective standard asynchronous motor.
  • the hydraulic unit according to the invention is arranged in a machine tool - in particular in its tensioning device - or in a press or in a plastic machine - in particular plastic injection molding machine - or in a loading device for a hydraulic accumulator.
  • a crawl or even a standstill with maintained working pressure is often necessary, so that the energy saving potentials according to the invention are used frequently.
  • Detecting the pressure holding operation via the pressure sensor and the swivel angle sensor is simple in terms of apparatus technology.
  • FIG. 1 shows a hydraulic circuit diagram of a first embodiment of a hydraulic unit according to the invention. It has a variable displacement pump 1 which supplies via a working line 7 a consumer (not shown). In the working line 7 an adjustable metering orifice 8 is arranged to control the consumer.
  • the hydraulic unit according to the invention is operated in an open hydraulic circuit, wherein the variable displacement pump 1 via a tank line 22 sucks pressure medium from a tank T.
  • a swivel angle of the variable displacement pump 1 is adjusted via a pressure regulator 2. This is connected via a control line 10 with the working line 7 upstream of the metering orifice 8. Also upstream of the metering orifice 8, a pressure sensor 5 is arranged, which is connected via a signal line 12 to a frequency converter 6.
  • the frequency converter 6 is connected via electrical lines 14 with a variable asynchronous motor 3.
  • the asynchronous motor 3 is connected to the variable displacement pump 1 via a shaft 16, in which a clutch 18 is arranged.
  • a swivel angle sensor 4 is arranged, whose output signal is transmitted via a signal line 20 to the frequency converter 6.
  • a pressure relief valve 24 is arranged, in which an effective spring force in the closing direction is adjustable.
  • the pressure relief valve 24 relieves in the case of a response, the working line 7 to the tank T.
  • a working pressure is established in the working line 7, which is reported via the control line 10 to the pressure regulator 2.
  • This increases the swivel angle as the working pressure decreases while decreasing it as the working pressure increases.
  • the swivel angle is reported by the swivel angle sensor 4 via the signal line 20 to the frequency converter 6, while the working pressure is reported by the pressure sensor 5 via the signal line 12 to the frequency converter 6. This supplies the asynchronous motor 3 with electrical power as a function of the two signals.
  • FIG. 2 shows a hydraulic circuit diagram of a second embodiment of a hydraulic unit according to the invention. In the following, only the differences from the first embodiment according to FIG. 1 explained.
  • a programmable logic controller is connected via a signal line 126 to a frequency converter 106 that is simplified compared to the first exemplary embodiment.
  • This controller 128 is superordinate to the frequency converter 106 and controls it.
  • the signal line 12 connected to the pressure sensor 5 and the signal line 20 connected to the swivel angle sensor 4 are connected to the controller 128.
  • a corresponding control signal for power control of the asynchronous motor 3 is transmitted from the controller 128 via the signal line 126 to the frequency converter 106.
  • the variable displacement pump 1 is swiveled back via the pressure regulator 2 . If, in this case, the swivel angle determined by the swivel angle sensor 4 drops below a threshold value, while at the same time the working pressure in the working line 7 determined by the pressure sensor 5 remains above a predetermined threshold value, an electronic circuit associated with the frequency converter 6 recognizes the pressure hold operation.
  • This can also be a zero stroke operation in a theoretical limit case, in which the variable displacement pump 1 is pivoted back to zero and no further pressure medium in the Working line 7 promotes. In this case, the previously generated working pressure is maintained in the working line 7 and leaves the consumer against his load force.
  • This pressure holding or zero lifting operation is inventively detected by the sensors 4, 5, whereupon in addition to the torque in particular, the speed of the induction motor 3 is reduced.
  • the hydraulic unit according to the invention saves energy.
  • variable displacement pump may be an axial piston pump or a radial piston pump.
  • a hydraulic unit with a controllable electric motor and with a hydrostatic variable displacement pump which can be coupled thereto, the pivoting angle of which can be adjusted via a hydromechanical adjusting device.
  • the swivel angle can be detected via a swivel angle sensor and a working pressure of the variable displacement pump via a pressure sensor.
  • a rotational speed of the electric motor is controllable in dependence on the swivel angle sensor and the pressure sensor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft ein Hydroaggregat gemäß dem Oberbegriff des Patentanspruchs 1 und ein Verfahren zum Betrieb eines Hydroaggregats.The invention relates to a hydraulic unit according to the preamble of patent claim 1 and a method for operating a hydraulic unit.

Bei derartigen Hydroaggregaten mit einer Hydropumpe, die von einem Elektromotor angetrieben wird, sind Anordnungen mit Konstantpumpen bekannt. Bei einem Betrieb mit vergleichsweise geringem Volumenstrom und vergleichsweise hohem Druck wird trotz geringer Leistung des Hydroaggregats der Elektromotor bei geringen Drehzahlen mit hohem Drehmoment belastet. Dabei ist in derartigen Teillastbetrieben durch die ohmschen Verluste am Elektromotor ein schlechter Wirkungsgrad des Hydroaggregats gegeben. Weiterhin ist nachteilig, dass die Kühlung durch einen an die Drehzahl des Elektromotors gekoppelten Motorlüfter dabei zu gering werden kann.In such hydraulic units with a hydraulic pump, which is driven by an electric motor, arrangements are known with constant displacement pumps. In operation with a comparatively low volume flow and comparatively high pressure, the electric motor is loaded at low rotational speeds with high torque despite low power of the hydraulic unit. It is given in such part-load operations by the ohmic losses on the electric motor, a poor efficiency of the hydraulic unit. Another disadvantage is that the cooling can be too low by a motor fan coupled to the rotational speed of the electric motor.

Aus der Patentschrift US 5 951 258 ist bereits eine Regelung bekannt, welche in Abhängigkeit von einer Motordrehzahl den Schwenkwinkel einer Pumpe regelt. Aus der Patentschrift US 4 823 552 ist bereits eine Regelung bekannt, welche in Abhängigkeit von einem Schwenkwinkelsensor ein hydraulisches Ventil ansteuert.From the patent US 5,951,258 already a scheme is known, which regulates the pivot angle of a pump depending on an engine speed. From the patent US 4,823,552 already a scheme is known, which controls a hydraulic valve in response to a swivel angle sensor.

Die Druckschrift DE 10 2007 007 005 A1 zeigt in Figur 3 ein Hydroaggregat zur Versorgung eines Verbrauchers, bei dem eine Pumpe von einem einstellbaren Elektromotor angetrieben wird. Die Pumpe ist eine Verstellpumpe. Dabei sind ein hydromechanischer Regler für einen Schwenkwinkel der Verstellpumpe und ein Regler für die Motordrehzahl vorgesehen.The publication DE 10 2007 007 005 A1 shows in Figure 3, a hydraulic unit for supplying a consumer, in which a pump is driven by an adjustable electric motor. The pump is a variable displacement pump. In this case, a hydromechanical controller for a swivel angle of the variable displacement pump and a controller for the engine speed are provided.

In einem Druckhaltebetrieb, bei dem von dem Hydroaggregat bzw. der Verstellpumpe ein gewisser Druck ohne nennenswerte Volumenströme gehalten werden muss, schwenkt die Verstellpumpe zurück. Dabei wird das Drehmoment des Hydroaggregats bzw. des Elektromotors abgesenkt, was zu einer Energieeinsparung führt.In a pressure-holding operation in which a certain pressure without appreciable volume flows has to be maintained by the hydraulic unit or the variable-displacement pump, the variable-displacement pump pivots back. In this case, the torque of the hydraulic unit or the electric motor is lowered, resulting in energy savings.

Nachteilig an derartigen Hydroaggregaten ist, dass der Elektromotor im Teillastbetrieb mit kaum veränderter Drehzahl betrieben wird und dabei noch eine nennenswerte Verlustleistung aufweist.A disadvantage of such hydraulic units that the electric motor is operated in part-load operation with barely changed speed while still has a significant power loss.

Dem entsprechend liegt der Erfindung die Aufgabe zu Grunde, ein Hydroaggregat zu schaffen, dessen Wirkungsgrad bei Teillastbetrieb weiter verbessert ist.Accordingly, the invention is based on the object to provide a hydraulic unit whose efficiency is further improved during partial load operation.

Diese Aufgabe wird gelöst durch ein Hydroaggregat mit den Merkmalen des Patentanspruchs 1 und durch ein Verfahren zu dessen Betrieb gemäß Patentanspruch 7.This object is achieved by a hydraulic unit having the features of patent claim 1 and by a method for its operation according to patent claim 7.

Das erfindungsgemäße Hydroaggregat hat einen regelbaren Elektromotor und eine daran koppelbare hydrostatische Verstellpumpe, deren Schwenkwinkel über eine hydromechanische Verstelleinrichtung einstellbar ist. Dabei sind der Schwenkwinkel über einen Schwenkwinkelsensor und ein Arbeitsdruck der Verstellpumpe über einen Drucksensor erfassbar. Eine Drehzahl des Elektromotors ist in Abhängigkeit des Schwenkwinkelsensors und des Drucksensors regelbar. Damit kann im Teillastbetrieb die Verlustleistung des Hydroaggregats minimiert werden. Zudem ist die Lösung für die Nachrüstung bestehender Anlagen vorteilhaft, da Schnittstellen zur Anlagensteuerung, zur Energieversorgung und zur Hydraulik unverändert genutzt werden können.The hydraulic unit according to the invention has a controllable electric motor and a hydrostatic variable displacement pump which can be coupled thereto and whose pivoting angle can be set by means of a hydromechanical adjusting device. In this case, the swivel angle can be detected via a swivel angle sensor and a working pressure of the variable displacement pump via a pressure sensor. A rotational speed of the electric motor is controllable in dependence on the swivel angle sensor and the pressure sensor. Thus, the power loss of the hydraulic unit can be minimized in partial load operation. In addition, the solution for retrofitting existing systems is advantageous because interfaces for plant control, power supply and hydraulics can be used unchanged.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Patentansprüchen beschrieben.Further advantageous embodiments of the invention are described in the dependent claims.

Es wird besonders bevorzugt, wenn die Drehzahl des Elektromotors über einen Frequenzumrichter regelbar ist. Dadurch kann die Pumpe bei routinemäßigen Unterbrechungen (Reparatur, Werkzeugwechsel, Pause) problemlos abgeschaltet werden, was zu weiterer Energieeinsparung führt.It is particularly preferred if the rotational speed of the electric motor is controllable via a frequency converter. As a result, the pump can be easily switched off in the event of routine interruptions (repair, tool change, break), which leads to further energy savings.

Bei einer bevorzugten Weiterbildung ist eine dem Frequenzumrichter übergeordnete speicherprogrammierbare Steuerung vorgesehen, die mit dem Schwenkwinkelsensor und mit dem Drucksensor verbunden ist. Diese kann den Frequenzumrichter steuern.In a preferred development, a frequency-controlled superordinate programmable logic controller is provided which is connected to the swivel angle sensor and to the pressure sensor. This can control the frequency converter.

Bei einer bevorzugten Weiterbildung ist die hydromechanische Verstelleinrichtung ein Druckregler oder ein kombinierter Druck-Förderstromregler.In a preferred embodiment, the hydromechanical adjusting device is a pressure regulator or a combined pressure-flow regulator.

Vorzugsweise ist der Elektromotor ein Asynchronmotor, insbesondere ein kostengünstiger Norm-Asynchronmotor.Preferably, the electric motor is an asynchronous motor, in particular a cost-effective standard asynchronous motor.

Bei bevorzugten Anwendungsfällen ist das erfindungsgemäße Hydroaggregat in einer Werkzeugmaschine - insbesondere in deren Spannvorrichtung - oder in einer Presse oder in einer Kunststoffmaschine - insbesondere Kunststoffspritzgießmaschine - oder in einer Ladevorrichtung für einen Hydrospeicher angeordnet. Bei diesen Anwendungsfällen ist häufig eine Schleichfahrt oder sogar ein Stillstand mit gehaltenem Arbeitsdruck nötig, so dass die erfindungsgemäßen Energieeinsparungspotenziale entsprechend häufig genutzt werden.In preferred applications, the hydraulic unit according to the invention is arranged in a machine tool - in particular in its tensioning device - or in a press or in a plastic machine - in particular plastic injection molding machine - or in a loading device for a hydraulic accumulator. In these applications, a crawl or even a standstill with maintained working pressure is often necessary, so that the energy saving potentials according to the invention are used frequently.

Das erfindungsgemäße Verfahren zur Steuerung eines Hydroaggregats gemäß einem der vorhergehenden Ansprüche hat die Schritte:

  • Erkennen eines Druckhaltebetriebes; und
  • Verringerung der Drehzahl des Elektromotors.
The method according to the invention for controlling a hydraulic unit according to one of the preceding claims has the steps:
  • Detecting a pressure holding operation; and
  • Reduction of the speed of the electric motor.

Damit kann im Druckhaltebetrleb die Verlustleistung des Hydroaggregats minimiert werden.Thus, the power loss of the hydraulic unit can be minimized in Druckhaltebetrleb.

Vorrichtungstechnisch einfach erfolgt das Erkennen des Druckhaltebetriebes über den Drucksensor und den Schwenkwinkelsensor.Detecting the pressure holding operation via the pressure sensor and the swivel angle sensor is simple in terms of apparatus technology.

Es wird bevorzugt, wenn das Erkennen des Druckhaltebetriebes durch Erreichen eines vorbestimmten Arbeitsdrucks und durch Unterschreiten eines vorbestimmten Schwenkwinkels erfolgt.It is preferred if the recognition of the pressure holding operation by reaching a predetermined working pressure and by falling below a predetermined pivot angle.

Im Folgenden werden anhand der Figuren verschiede Ausführungsbeispiele der Erfindung detailliert beschrieben. Es zeigen:

  • Figur 1 einen hydraulischen Schaltplan eines ersten Ausführungsbeispiels eines erfindungsgemäßen Hydroaggregats; und
  • Figur 2 einen hydraulischen Schaltplan eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Hydroaggregats.
In the following, various embodiments of the invention will be described in detail with reference to FIGS. Show it:
  • FIG. 1 a hydraulic circuit diagram of a first embodiment of a hydraulic unit according to the invention; and
  • FIG. 2 a hydraulic circuit diagram of a second embodiment of a hydraulic unit according to the invention.

Figur 1 zeigt einen hydraulischen Schaltplan eines ersten Ausführungsbeispiels eines erfindungsgemäßen Hydroaggregats. Es hat eine Verstellpumpe 1, die über eine Arbeitsleitung 7 einen (nicht gezeigten) Verbraucher versorgt. In der Arbeitsleitung 7 ist eine einstellbare Zumessblende 8 zur Steuerung des Verbrauchers angeordnet. Das erfindungsgemäße Hydroaggregat wird in einem offenen Hydraulikkreislauf betrieben, wobei die Verstellpumpe 1 über eine Tankleitung 22 Druckmittel von einem Tank T ansaugt. FIG. 1 shows a hydraulic circuit diagram of a first embodiment of a hydraulic unit according to the invention. It has a variable displacement pump 1 which supplies via a working line 7 a consumer (not shown). In the working line 7 an adjustable metering orifice 8 is arranged to control the consumer. The hydraulic unit according to the invention is operated in an open hydraulic circuit, wherein the variable displacement pump 1 via a tank line 22 sucks pressure medium from a tank T.

Ein Schwenkwinkel der Verstellpumpe 1 wird über einen Druckregler 2 eingestellt. Dieser ist über eine Steuerleitung 10 mit der Arbeitsleitung 7 stromauf der Zumessblende 8 verbunden. Ebenfalls stromauf der Zumessblende 8 ist ein Drucksensor 5 angeordnet, der über eine Signalleitung 12 mit einem Frequenzumrichter 6 verbunden ist.A swivel angle of the variable displacement pump 1 is adjusted via a pressure regulator 2. This is connected via a control line 10 with the working line 7 upstream of the metering orifice 8. Also upstream of the metering orifice 8, a pressure sensor 5 is arranged, which is connected via a signal line 12 to a frequency converter 6.

Der Frequenzumrichter 6 ist über elektrische Leitungen 14 mit einem regelbaren Asynchronmotor 3 verbunden. Der Asynchronmotor 3 ist über eine Welle 16, in der eine Kupplung 18 angeordnet ist, mit der Verstellpumpe 1 verbunden.The frequency converter 6 is connected via electrical lines 14 with a variable asynchronous motor 3. The asynchronous motor 3 is connected to the variable displacement pump 1 via a shaft 16, in which a clutch 18 is arranged.

An der Verstellpumpe 1 ist ein Schwenkwinkelsensor 4 angeordnet, dessen Ausgangssignal über eine Signalleitung 20 an den Frequenzumrichter 6 übertragen wird.On the variable displacement pump 1, a swivel angle sensor 4 is arranged, whose output signal is transmitted via a signal line 20 to the frequency converter 6.

An der Arbeitsleitung 7 zwischen der Verstellpumpe 1 und der Zumessblende 8 ist ein Druckbegrenzungsventil 24 angeordnet, bei dem eine in Schließrichtung wirksame Federkraft einstellbar ist. Das Druckbegrenzungsventil 24 entlastet im Falle eines Ansprechens die Arbeitsleitung 7 zum Tank T.On the working line 7 between the variable displacement pump 1 and the metering orifice 8, a pressure relief valve 24 is arranged, in which an effective spring force in the closing direction is adjustable. The pressure relief valve 24 relieves in the case of a response, the working line 7 to the tank T.

Im Folgenden wird die Funktion des ersten Ausführungsbeispiels des erfindungsgemäßen Hydroaggregats gemäß Figur 1 erläutert.In the following, the function of the first embodiment of the hydraulic unit according to the invention according to FIG. 1 explained.

In Abhängigkeit einer Last des (nicht gezeigten) Verbrauchers und einer Einstellung der Zumessblende 8 stellt sich in der Arbeitsleitung 7 ein Arbeitsdruck ein, der über die Steuerleitung 10 zum Druckregler 2 gemeldet wird. Dieser vergrößert bei abnehmendem Arbeitsdruck den Schwenkwinkel, während er ihn bei zunehmendem Arbeitsdruck verringert. Bei einer Verringerung des Schwenkwinkels wird die Förderleistung der Verstellpumpe 1 verringert. Der Schwenkwinkel wird vom Schwenkwinkelsensor 4 über die Signalleitung 20 zum Frequenzumrichter 6 gemeldet, während der Arbeitsdruck vom Drucksensor 5 über die Signalleitung 12 zum Frequenzumrichter 6 gemeldet wird. Dieser versorgt in Abhängigkeit der beiden Signale den Asynchronmotor 3 mit elektrischer Leistung.Depending on a load of the consumer (not shown) and a setting of the metering orifice 8, a working pressure is established in the working line 7, which is reported via the control line 10 to the pressure regulator 2. This increases the swivel angle as the working pressure decreases while decreasing it as the working pressure increases. With a reduction of the swivel angle, the delivery rate of the variable displacement pump 1 is reduced. The swivel angle is reported by the swivel angle sensor 4 via the signal line 20 to the frequency converter 6, while the working pressure is reported by the pressure sensor 5 via the signal line 12 to the frequency converter 6. This supplies the asynchronous motor 3 with electrical power as a function of the two signals.

Figur 2 zeigt einen hydraulischen Schaltplan eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Hydroaggregats. Dabei werden im Folgenden nur die Unterschiede zum ersten Ausführungsbeispiel gemäß Figur 1 erläutert. FIG. 2 shows a hydraulic circuit diagram of a second embodiment of a hydraulic unit according to the invention. In the following, only the differences from the first embodiment according to FIG. 1 explained.

An einem gegenüber dem ersten Ausführungsbeispiel vereinfachten Frequenzumrichter 106 ist über eine Signalleitung 126 eine speicherprogrammierbare Steuerung angeschlossen. Diese Steuerung 128 ist dem Frequenzumrichter 106 übergeordnet und steuert diesen. Dazu sind die mit dem Drucksensor 5 verbundene Signalleitung 12 und die mit dem Schwenkwinkelsensor 4 verbundene Signalleitung 20 an die Steuerung 128 angeschlossen. Ein entsprechendes Steuerungssignal zur Leistungsregelung des Asynchronmotors 3 wird von der Steuerung 128 über die Signalleitung 126 zum Frequenzumrichter 106 übertragen.A programmable logic controller is connected via a signal line 126 to a frequency converter 106 that is simplified compared to the first exemplary embodiment. This controller 128 is superordinate to the frequency converter 106 and controls it. For this purpose, the signal line 12 connected to the pressure sensor 5 and the signal line 20 connected to the swivel angle sensor 4 are connected to the controller 128. A corresponding control signal for power control of the asynchronous motor 3 is transmitted from the controller 128 via the signal line 126 to the frequency converter 106.

Erfindungsgemäß ist insbesondere folgender Fall von Interesse: Wenn der hydraulische Verbraucher (zum Beispiel in einer Presse) nicht weiter bewegt werden soll bzw. kann und trotzdem der in der Arbeitsleitung 7 erreichte Arbeitsdruck aufrecht erhalten werden soll, wird die Verstellpumpe 1 über den Druckregler 2 zurückgeschwenkt. Wenn dabei der vom Schwenkwinkelsensor 4 ermittelte Schwenkwinkel unter einen Schwellwert absinkt, während gleichzeitig der vom Drucksensor 5 ermittelte Arbeitsdruck in der Arbeitsleitung 7 oberhalb eines vorbestimmten Schwellwertes bleibt, erkennt eine den Frequenzumrichter 6 zugeordnete elektronische Schaltung den Druckhaltebetrieb. Dieser kann in einem theoretischen Grenzfall auch ein Nullhubbetrieb sein, bei dem die Verstellpumpe 1 auf Null zurück geschwenkt ist und kein weiteres Druckmittel in die Arbeitsleitung 7 fördert. Dabei bleibt der zuvor erzeugte Arbeitsdruck in der Arbeitsleitung 7 erhalten und lässt den Verbraucher gegen seine Lastkraft verharren.According to the invention, the following case is of particular interest: If the hydraulic consumer (for example in a press) is not to be moved further and yet the working pressure reached in the working line 7 is to be maintained, the variable displacement pump 1 is swiveled back via the pressure regulator 2 , If, in this case, the swivel angle determined by the swivel angle sensor 4 drops below a threshold value, while at the same time the working pressure in the working line 7 determined by the pressure sensor 5 remains above a predetermined threshold value, an electronic circuit associated with the frequency converter 6 recognizes the pressure hold operation. This can also be a zero stroke operation in a theoretical limit case, in which the variable displacement pump 1 is pivoted back to zero and no further pressure medium in the Working line 7 promotes. In this case, the previously generated working pressure is maintained in the working line 7 and leaves the consumer against his load force.

Dieser Druckhalte- bzw. Nullhubbetrieb wird erfindungsgemäß über die Sensoren 4, 5 erkannt, woraufhin neben dem Drehmoment insbesondere auch die Drehzahl des Asynchronmotors 3 reduziert wird.This pressure holding or zero lifting operation is inventively detected by the sensors 4, 5, whereupon in addition to the torque in particular, the speed of the induction motor 3 is reduced.

Durch diese Leistungsverringerung des Asynchronmotors 3 im Druckhalte- bzw. Nullhubbetrieb spart das erfindungsgemäße Hydroaggregat Energie.As a result of this power reduction of the asynchronous motor 3 in the pressure-maintaining or zero-stroke operation, the hydraulic unit according to the invention saves energy.

Bei beiden gezeigten Ausführungsbeispielen kann die Verstellpumpe eine Axialkolbenpumpe oder eine Radialkolbenpumpe sein.In both embodiments shown, the variable displacement pump may be an axial piston pump or a radial piston pump.

Bei Strangpressen z.B. gibt es eine Schließfunktion für ein Presswerkzeug, die für den gesamten Pressvorgang aufrecht erhalten werden muss. Dieser dauert ca. 50-80% des gesamten Zyklus und verlangt dabei eine geringe Fördermenge bei gleichzeitig hohem Druck. Dabei kommen gemäß dem Stand der Technik Steuerölsysteme mit Speicherladepumpen und Speichersystemen zu Einsatz. Derartige Speicherladepumpen werden oft für einen maximalen Arbeitszyklus ausgelegt. Somit sind die Speicherladepumpen für langsamere Arbeitszyklen (z. B. bei Produktionswechsel) überdimensioniert. Diese Speicherladepumpen arbeiten daher relativ häufig und im Druckhalte- bzw. Nullhubbetrieb. Der Einsatz eines erfindungsgemäßen Hydroaggregates rechnet sich bei diesem Anwendungsbeispiel nach 1 bis 2 Jahren.In extruding e.g. There is a closing function for a pressing tool, which must be maintained for the entire pressing process. This takes about 50-80% of the entire cycle and requires a low flow rate at the same time high pressure. In this case, according to the prior art, control oil systems with storage charge pumps and storage systems are used. Such accumulator charge pumps are often designed for a maximum duty cycle. Thus, the storage loading pumps are oversized for slower working cycles (eg during production changes). These accumulator charging pumps therefore operate relatively frequently and in pressure maintenance or zero-stroke operation. The use of a hydraulic unit according to the invention pays off in this application example after 1 to 2 years.

Offenbart ist ein Hydroaggregat mit einem regelbaren Elektromotor und mit einer daran koppelbaren hydrostatischen Verstellpumpe, deren Schwenkwinkel über eine hydromechanische Verstelleinrichtung einstellbar ist. Dabei sind der Schwenkwinkel über einen Schwenkwinkelsensor und ein Arbeitsdruck der Verstellpumpe über einen Drucksensor erfassbar. Eine Drehzahl des Elektromotors ist in Abhängigkeit des Schwenkwinkelsensors und des Drucksensors regelbar.Disclosed is a hydraulic unit with a controllable electric motor and with a hydrostatic variable displacement pump which can be coupled thereto, the pivoting angle of which can be adjusted via a hydromechanical adjusting device. In this case, the swivel angle can be detected via a swivel angle sensor and a working pressure of the variable displacement pump via a pressure sensor. A rotational speed of the electric motor is controllable in dependence on the swivel angle sensor and the pressure sensor.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Verstellpumpevariable
22
Druckreglerpressure regulator
33
Asynchronmotorasynchronous
44
SchwenkwinkelsensorSwing angle sensor
55
Drucksensorpressure sensor
6; 1066; 106
Frequenzumrichterfrequency converter
77
Arbeitsleitungworking line
88th
Zumessblendemetering orifice
1010
SteuerteitungSteuerteitung
1212
Signalleitungsignal line
1414
elektrische Leitungenelectric lines
1616
Wellewave
1818
Kupplungclutch
2020
Signalleitungsignal line
2222
Tankleitungtank line
2424
DruckbegrenzungsventilPressure relief valve
126126
Signalleitungsignal line
128128
speicherprogrammierbare Steuerungprogrammable logic controller
TT
Tanktank

Claims (9)

  1. Hydraulic assembly with a controllable electric motor (3) and with an adjusting pump (1) which can be coupled to the said electric motor, it being possible for the pivot angle of the said adjusting pump to be set by means of a hydromechanical adjusting device (2) and it being possible for the operating pressure of the said adjusting pump to be detected by means of a pressure sensor (5), characterized in that the pivot angle can be detected by means of a pivot angle sensor (4), wherein a rotation speed of the electric motor (3) can be controlled depending on the pivot angle sensor (4) and the pressure sensor (5).
  2. Hydraulic assembly according to Claim 1, wherein the rotation speed of the electric motor (3) can be controlled by means of a frequency converter (6; 106).
  3. Hydraulic assembly according to Claim 2, having a programmable logic controller (128) which is superordinate to the frequency converter (106) and which is connected to the pivot angle sensor (4) and to the pressure sensor (5).
  4. Hydraulic assembly according to Claim 1, wherein the hydromechanical adjusting device is a pressure regulator (2) or a combined pressure/flow regulator.
  5. Hydraulic assembly according to Claim 1, wherein the electric motor is an asynchronous motor (3).
  6. Hydraulic assembly according to Claim 1, which is arranged in a machine tool or in a press or in a plastics machine or in a charging apparatus for a hydraulic accumulator.
  7. Method for controlling a hydraulic assembly according to one of the preceding claims, characterized by the steps of:
    - identifying a pressure-holding mode; and
    - reducing the rotation speed of the electric motor (3).
  8. Method according to Claim 7, wherein the step of "identifying the pressure-holding mode" is performed by means of the pressure sensor (5) and the pivot angle sensor (4).
  9. Method according to Claim 8, wherein the step of "identifying the pressure-holding mode" is performed by a predetermined operating pressure being reached and by a predetermined pivot angle being undershot.
EP11730221.6A 2010-07-14 2011-07-02 Hydraulic assembly Active EP2593679B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010027183 DE102010027183A1 (en) 2010-07-14 2010-07-14 hydraulic unit
PCT/EP2011/003295 WO2012007114A2 (en) 2010-07-14 2011-07-02 Hydraulic assembly

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Publication Number Publication Date
EP2593679A2 EP2593679A2 (en) 2013-05-22
EP2593679B1 true EP2593679B1 (en) 2016-04-27

Family

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Application Number Title Priority Date Filing Date
EP11730221.6A Active EP2593679B1 (en) 2010-07-14 2011-07-02 Hydraulic assembly

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Country Link
EP (1) EP2593679B1 (en)
CN (1) CN102971532A (en)
DE (1) DE102010027183A1 (en)
ES (1) ES2573510T3 (en)
WO (1) WO2012007114A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012016780B4 (en) * 2012-06-01 2021-07-22 Robert Bosch Gmbh Method of operating a fluid pump
DE102016011778A1 (en) * 2016-08-11 2018-02-15 M A E Maschinen- Und Apparatebau Götzen Gmbh Hydraulic, in particular pressure accumulatorless, drive arrangement for and with a consumer, in particular for presses, and method for operating such a hydraulic drive assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823552A (en) * 1987-04-29 1989-04-25 Vickers, Incorporated Failsafe electrohydraulic control system for variable displacement pump
DE4335403C1 (en) * 1993-10-18 1994-12-15 Karl Hehl Hydraulic device
US5951258A (en) * 1997-07-09 1999-09-14 Caterpillar Inc. Torque limiting control system for a hydraulic work machine
DE10110398A1 (en) * 2001-03-03 2002-09-26 Mannesmann Rexroth Ag Method for regulating the pressure medium supply to a hydraulically operated actuator
DE102005025590A1 (en) * 2005-06-03 2006-12-07 Hydac Electronic Gmbh Regulating device and method for operating a control device
DE102007007005B4 (en) 2007-02-08 2021-12-02 Robert Bosch Gmbh Electro-hydraulic control arrangement
DE102008019501B4 (en) * 2008-04-17 2019-03-21 Robert Bosch Gmbh Electrohydraulic control arrangement

Also Published As

Publication number Publication date
EP2593679A2 (en) 2013-05-22
ES2573510T3 (en) 2016-06-08
DE102010027183A1 (en) 2012-01-19
WO2012007114A3 (en) 2012-03-22
CN102971532A (en) 2013-03-13
WO2012007114A2 (en) 2012-01-19

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