WO2007042499A1 - Pressurised medium cylinder and method for determining the operating time and/or cycles thereof - Google Patents

Pressurised medium cylinder and method for determining the operating time and/or cycles thereof Download PDF

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Publication number
WO2007042499A1
WO2007042499A1 PCT/EP2006/067192 EP2006067192W WO2007042499A1 WO 2007042499 A1 WO2007042499 A1 WO 2007042499A1 EP 2006067192 W EP2006067192 W EP 2006067192W WO 2007042499 A1 WO2007042499 A1 WO 2007042499A1
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WIPO (PCT)
Prior art keywords
pressure
cylinder
operating
cycles
piston
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PCT/EP2006/067192
Other languages
German (de)
French (fr)
Inventor
Hans-Joachim Molka
Harald Kröll
Original Assignee
Ludwig Ehrhardt Gmbh
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Publication of WO2007042499A1 publication Critical patent/WO2007042499A1/en

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Classifications

    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • 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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring

Definitions

  • the invention relates to a pressure medium cylinder with a piston movably guided in a cylinder bore of a housing and at least one pressure chamber, which can be acted upon with pressure medium for actuating the piston. Furthermore, the invention relates to a method for detecting the operating time and / or operating cycles of such a pressure medium cylinder.
  • Hydraulic cylinders are used in practice in a wide variety of applications. Among other things, they serve for the linear drive of objects, as a lifting cylinder or as a clamping cylinder in grips for clamping workpieces, tools or devices.
  • the pressure medium cylinders are claimed in very different ways and sometimes very strong. Due to the friction of the piston in the cylinder bore and seals they are subject to constant wear. Pressure cylinder must therefore be maintained at regular intervals and, if necessary, replaced seals. The maintenance intervals are usually determined after a predetermined time interval according to the calendar. However, depending on
  • the invention is based on the problem, a pressure cylinder of the type mentioned in such a way that the operating hours and / or the operating cycles can be determined in a simple manner.
  • the pressure cylinder according to the invention is characterized in that the pressure chamber is associated with a pressure transducer, by means of which signals the operating time measured and / or the operating cycles are counted.
  • the pressure in the pressure chamber is determined and, starting from this pressure, the operating time and / or operating cycles are measured or counted.
  • a pressure sensor is used in the pressure chamber, which operates a clock for measuring the operating time and / or a counter for counting the working cycles. For example, when a predetermined threshold pressure in the pressure chamber is exceeded, a clock for the operating time is set in motion and stopped again when this threshold pressure is signed and / or the counter is incremented by "1" every time the threshold pressure is exceeded.
  • a piezoelectric crystal is used as a pressure transducer.
  • Piezo crystals are proven as pressure transducers and allow a structurally simple design.
  • the pressure transducer is, as I said, associated with the pressure chamber.
  • the pressure sensor is assigned to one of the two pressure chambers, preferably the pressure chamber for the working stroke.
  • both pressure chambers may each be assigned a pressure transducer.
  • One or both pressure transducers can also be arranged in the piston, preferably with an associated chip. This variant has the advantage that the chip is not accessible from the outside and thus difficult to manipulate.
  • FIG. 1 shows a first embodiment of a pressure cylinder with the invention features in a schematic longitudinal section
  • Fig. 2 shows another embodiment of a pressure cylinder with the features of the invention in a schematic longitudinal section.
  • the pressure medium cylinder 10 has a housing 1 1, which, of course, not integrally closed, as shown in the schematic representation, but is formed in a conventional manner so that the pressure medium cylinder 10 is mounted.
  • the housing 1 1 encloses a cylinder bore 12, in which a piston 13 is guided displaceably in the longitudinal direction of the pressure medium cylinder 10.
  • the pressure medium cylinder 10 is formed in the present case as a double-acting cylinder, so that in the cylinder bore 12, two pressure chambers 14 and 15 are formed.
  • each pressure chamber 14, 15 associated with a pressure transducer 16.
  • Each pressure transducer 16 has on its side facing the cylinder bore 12 as the actual pressure transducer a piezo-crystal 17 on this aligned with the wall of the cylinder bore 12 or is slightly reset.
  • the pressure sensors 16 are connected to an evaluation unit 18 by means of a cable, infrared or Bluetooth interface or in another suitable manner in which, starting from the signals of the piezo crystals 17, the operating cycles are counted or the operating hours are measured. Optionally, both the operating cycles counted by the evaluation unit 18, and the operating hours are measured.
  • the piezo-crystal 17 When a predetermined threshold pressure in the associated pressure chamber 14, 15, the piezo-crystal 17 sends a signal to the evaluation unit 18.
  • the threshold pressure corresponds approximately to the working pressure of the pressure medium cylinder 10 or is slightly lower.
  • the clock which measures the operating time, is now set in motion. As soon as the predetermined threshold pressure is fallen below again, the piezo-crystal 17 stops the clock of the evaluation unit 18. If the predetermined threshold pressure is exceeded again, the time measurement started again, the now determined time is added to the previously measured time.
  • the procedure is similar. Now, when the threshold pressure is exceeded, a counter is continuously incremented by "1" in the evaluation unit 18. Alternatively, the counting can also take place as soon as the threshold pressure is again undershot from above, ie when the pressure drops.
  • a manufacturer-specific identification number is stored in addition to the operating cycles and / or the operating time.
  • the stored electronic data may then be transmitted to a reader via, for example, an infrared interface, a Bluetooth interface, inductive or any other suitable technique, the wireless transmission techniques expressly mentioned above being preferred for simplicity.
  • the user's staff or even the maintenance personnel of the manufacturer can thus depart with the reader in predetermined, calendar-specific time intervals, the existing pressure medium cylinder 10 and read the operating hours and / or operating cycles. This can then be transferred to a maintenance plan for planning the maintenance of the individual pressure cylinder 10. With supposedly premature failure of the pressure cylinder, the operating time and / or the operating cycles can also be determined reliably.
  • a pressure sensor 19 including evaluation unit 20 is associated with the piston 13, wherein only pressure changes in the working chamber of the cylinder 10 associated pressure chamber 14 are registered.
  • the pressure sensor is arranged in a bore 21 in the piston 13 and has at its end facing the pressure chamber 14 a piezo-crystal 22 or a stack of piezoelectric crystals.
  • the evaluation unit 20 is integrated and encapsulated, for example by means of a potting compound 23 to the pressure transducer 19.
  • this embodiment is analogous to the embodiment described above with reference to FIG.
  • Each pressure increase over a predetermined threshold pressure is registered and used for counting and / or operating hours count by means of the evaluation unit 20.
  • this variant has the advantage that the evaluation unit 20 is not accessible from the outside and thus difficult to manipulate.
  • the evaluation unit 20 is read by the Maintenance personnel after disassembly of the pressure cylinder 10 or via suitable wireless readers from the outside.
  • this variant has the advantage that no external energy, for example, by a battery, for the operation of the evaluation unit 18 and 20 is required.
  • the energy required for counting is provided by the piezo crystal 17 or 22 or the stack of piezo crystals. If the pressure is maintained in the pressure cylinder, the piezo crystals 17 and 22 generate no energy. This is harmless when counting the operating cycles, since the evaluation unit 18, 20 must be supplied with energy only during the counting process.
  • This variant is therefore particularly suitable in connection with the exemplary embodiment according to FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

A pressurised medium cylinder is generally comprises a piston (13) guided in a cylinder bore (12) of a housing (11) and at least one pressure chamber (14, 15), which is exposed to the pressurised medium for operating the piston (13). During maintenance or warranty loss, the number of operating hours and/or cycles is to be known and they must be determined in a simple manner. In order to facilitate the solution of said problems, the pressurised medium cylinder (10) is characterised in that the pressure chamber (14, 15) comprises a pressure sensor (16, 19) which is used for measuring the operating time signals and/or for calculating the operating cycles. The pressure in the pressure chamber (14, 15) is determined and the operating time and/or operating cycles are measured and/or calculated according thereto.

Description

DRUCKMITTELZYLINDER SOWIE VERFAHREN ZUM ERFASSEN DER PRESSURE CYLINDER AND METHOD FOR COLLECTING THE
BETRIEBSZEIT UND/ODER BETRIEBSZYKLEN EINESOPERATING TIME AND / OR OPERATING CYCLES ONE
DRUCKMITTELZYLINDERSCENTRAL PRESSURE CYLINDER
B e s c h r e i b u n g :Description :
Die Erfindung betrifft einen Druckmittelzylinder mit einem beweglich in einer Zylinderbohrung eines Gehäuses geführten Kolben und wenigstens einem Druckraum, welcher zum Betätigen des Kolbens mit Druckmittel beaufschlagbar ist. Des weiteren betrifft die Erfindung ein Verfahren zum Erfassen der Betriebszeit und/oder Betriebszyklen eines solchen Druckmittelzylinders.The invention relates to a pressure medium cylinder with a piston movably guided in a cylinder bore of a housing and at least one pressure chamber, which can be acted upon with pressure medium for actuating the piston. Furthermore, the invention relates to a method for detecting the operating time and / or operating cycles of such a pressure medium cylinder.
Druckmittelzylinder finden in der Praxis in unterschiedlichsten Anwendungen zahlreichen Einsatz. Unter anderem dienen sie zum linearen Antrieb von Gegenständen, als Hubzylinder oder als Spannzylinder in Spannzeugen zum Spannen von Werkstücken, Werkzeugen oder Vorrichtungen. Die Druckmittelzylinder werden dabei auf unterschiedlichste Weise und zum Teil sehr stark beansprucht. Durch die Reibung des Kolbens in der Zylinderbohrung und an Dichtungen unterliegen sie einem ständigen Verschleiß. Druckmittelzylinder müssen deshalb in regelmäßigen Abständen gewartet und gegebenenfalls Dichtungen ausgewechselt werden. Die Wartungsintervalle werden dabei meist nach einem vorbestimmten Zeitintervall nach dem Kalender bestimmt. Allerdings werden je nach Hydraulic cylinders are used in practice in a wide variety of applications. Among other things, they serve for the linear drive of objects, as a lifting cylinder or as a clamping cylinder in grips for clamping workpieces, tools or devices. The pressure medium cylinders are claimed in very different ways and sometimes very strong. Due to the friction of the piston in the cylinder bore and seals they are subject to constant wear. Pressure cylinder must therefore be maintained at regular intervals and, if necessary, replaced seals. The maintenance intervals are usually determined after a predetermined time interval according to the calendar. However, depending on
Anwendung in einem bestimmten kalendermäßig berechneten Zeitintervall durch die Druckmittelzylinder unterschiedlich häufige Betriebszyklen (Anzahl der Hübe) oder Betriebsstunden absolviert. Die kalendermäßige Bestimmung der Wartungsintervalle ist daher ungenau. Auch werden Druckmittelzylinder zuweilen vom Kunden reklamiert, da sie angeblich vorzeitig verschleißtypische Schäden aufweisen. Hier besteht ein Bedarf für die Hersteller, die tatsächlich absolvierten Betriebszyklen und/oder Betriebsstunden festzustellen.Application in a certain calendar-time interval calculated by the pressure cylinder different numbers of operating cycles (number of strokes) or operating hours completed. The calendar-related determination of the maintenance intervals is therefore inaccurate. Also, pressure cylinders are sometimes claimed by the customer, as they have prematurely wear typical wear. There is a need for manufacturers to determine the actual number of operating cycles and / or operating hours completed.
Hiervon ausgehend liegt der Erfindung das Problem zugrunde, einen Druckmittelzylinder der eingangs genannten Art derart weiterzubilden, daß die Betriebsstunden und/oder die Betriebszyklen auf einfache Weise bestimmt werden können.Proceeding from this, the invention is based on the problem, a pressure cylinder of the type mentioned in such a way that the operating hours and / or the operating cycles can be determined in a simple manner.
Zur Lösung dieses Problems ist der erfindungsgemäße Druckmittelzylinder dadurch gekennzeichnet, daß dem Druckraum ein Druckaufnehmer zugeordnet ist, mittels dessen Signale die Betriebszeit gemessen und/oder die Betriebszyklen gezählt werden. Nach dem erfindungsgemäßen Verfahren wird der Druck im Druckraum ermittelt und, ausgehend von diesem Druck, die Betriebszeit und/oder Betriebszyklen gemessen bzw. gezählt.To solve this problem, the pressure cylinder according to the invention is characterized in that the pressure chamber is associated with a pressure transducer, by means of which signals the operating time measured and / or the operating cycles are counted. According to the method of the invention, the pressure in the pressure chamber is determined and, starting from this pressure, the operating time and / or operating cycles are measured or counted.
Erfindungsgemäß wird also ein Druckaufnehmer im Druckraum eingesetzt, der eine Uhr zum Messen der Betriebszeit und/oder einen Zähler zum Zählen der Arbeitszyklen betätigt. Beispielsweise wird bei Überschreiten eines vorgegebenen Schwelldrucks im Druckraum eine Uhr für die Betriebszeit in Gang gesetzt und bei Unterschreiben dieses Schwelldrucks wieder gestoppt und/oder jedes Mal bei Überschreiten des Schwelldrucks der Zähler um „1" weitergeschaltet.According to the invention, therefore, a pressure sensor is used in the pressure chamber, which operates a clock for measuring the operating time and / or a counter for counting the working cycles. For example, when a predetermined threshold pressure in the pressure chamber is exceeded, a clock for the operating time is set in motion and stopped again when this threshold pressure is signed and / or the counter is incremented by "1" every time the threshold pressure is exceeded.
Nach einem konstruktiven Ausführungsbeispiel der Erfindung wird als Druckaufnehmer ein Piezo-Kristall eingesetzt. Piezo-Kristalle sind als Druckaufnehmer bewährt und ermöglichen eine konstruktiv einfache Gestaltung.According to a constructive embodiment of the invention, a piezoelectric crystal is used as a pressure transducer. Piezo crystals are proven as pressure transducers and allow a structurally simple design.
Der Druckaufnehmer ist, wie gesagt, dem Druckraum zugeordnet. Bei doppelt wirkenden Zylindern reicht es für die meisten Anwendungsfälle aus, wenn der Druckaufnehmer einem der beiden Druckräume zugeordnet ist, vorzugsweise dem Druckraum für den Arbeitshub. Gegebenenfalls können auch beiden Druckräumen je ein Druckaufnehmer zugeordnet sein. Ein oder beide Druckaufnehmer können, vorzugsweise mit zugehörigem Chip, auch im Kolben angeordnet sein. Diese Variante hat den Vorteil, daß der Chip von außen nicht zugänglich und damit nur schwer manipulierbar ist. Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. In dieser zeigen:The pressure transducer is, as I said, associated with the pressure chamber. For double-acting cylinders, it is sufficient for most applications, if the pressure sensor is assigned to one of the two pressure chambers, preferably the pressure chamber for the working stroke. Optionally, both pressure chambers may each be assigned a pressure transducer. One or both pressure transducers can also be arranged in the piston, preferably with an associated chip. This variant has the advantage that the chip is not accessible from the outside and thus difficult to manipulate. The invention will be explained in more detail with reference to an embodiment shown in the drawing. In this show:
Fig. 1 ein erstes Ausführungsbeispiel für einen Druckmittelzylinder mit den Erfindungsmerkmalen in einem schematischen Längsschnitt,1 shows a first embodiment of a pressure cylinder with the invention features in a schematic longitudinal section,
Fig. 2 ein weiteres Ausführungsbeispiel für einen Druckmittelzylinder mit den Erfindungsmerkmalen in einem schematischen Längsschnitt.Fig. 2 shows another embodiment of a pressure cylinder with the features of the invention in a schematic longitudinal section.
Der Druckmittelzylinder 10 weist ein Gehäuse 1 1 auf, welches, anders als in der schematischen Darstellung gezeigt, selbstverständlich nicht einstückig geschlossen ist, sondern in an sich bekannter Weise so ausgebildet ist, daß der Druckmittelzylinder 10 montierbar ist.The pressure medium cylinder 10 has a housing 1 1, which, of course, not integrally closed, as shown in the schematic representation, but is formed in a conventional manner so that the pressure medium cylinder 10 is mounted.
Das Gehäuse 1 1 umschließt eine Zylinderbohrung 12, in welcher ein Kolben 13 in Längsrichtung des Druckmittelzylinders 10 verschieblich geführt ist. Der Druckmittelzylinder 10 ist im vorliegenden Fall als doppelt wirkender Zylinder ausgebildet, so daß in der Zylinderbohrung 12 zwei Druckräume 14 und 15 gebildet sind.The housing 1 1 encloses a cylinder bore 12, in which a piston 13 is guided displaceably in the longitudinal direction of the pressure medium cylinder 10. The pressure medium cylinder 10 is formed in the present case as a double-acting cylinder, so that in the cylinder bore 12, two pressure chambers 14 and 15 are formed.
Nach dem in Fig. 1 dargestellten Ausführungsbeispiel ist jedem Druckraum 14, 15 ein Druckaufnehmer 16 zugeordnet. Jeder Druckaufnehmer 16 weist an seiner der Zylinderbohrung 12 zugewandten Seite als eigentlichen Druckaufnehmer einen Piezo-Kristall 17 auf Dieser fluchtet mit der Wandung der Zylinderbohrung 12 oder ist leicht zurückgesetzt. Die Druckaufnehmer 16 sind mit einer Auswerteeinheit 18 mittels eines Kabels, Infrarot- oder Bluetoothschnittstelle oder auf andere geeignete Weise verbunden, in welcher, ausgehend von den Signalen der Piezo-Kristalle 17, die Betriebszyklen gezählt oder die Betriebsstunden gemessen werden. Gegebenenfalls können durch die Auswerteeinheit 18 sowohl die Betriebszyklen gezählt, als auch die Betriebsstunden gemessen werden.According to the embodiment shown in FIG. 1, each pressure chamber 14, 15 associated with a pressure transducer 16. Each pressure transducer 16 has on its side facing the cylinder bore 12 as the actual pressure transducer a piezo-crystal 17 on this aligned with the wall of the cylinder bore 12 or is slightly reset. The pressure sensors 16 are connected to an evaluation unit 18 by means of a cable, infrared or Bluetooth interface or in another suitable manner in which, starting from the signals of the piezo crystals 17, the operating cycles are counted or the operating hours are measured. Optionally, both the operating cycles counted by the evaluation unit 18, and the operating hours are measured.
Konkret wird bei der Messung der Betriebsstunden wie folgt vorgegangen:Specifically, the measurement of operating hours is as follows:
Bei Überschreiten eines vorbestimmten Schwelldrucks in der zugehörigen Druckkammer 14, 15 sendet der Piezo-Kristall 17 ein Signal an die Auswerteeinheit 18. Der Schwelldruck entspricht dabei etwa dem Arbeitsdruck des Druckmittelzylinders 10 oder ist geringfügig niedriger. Die Uhr, welche die Betriebszeit mißt, wird nun in Gang gesetzt. Sobald der vorbestimmte Schwelldruck wieder unterschritten ist, stoppt der Piezo-Kristall 17 die Uhr der Auswerteeinheit 18. Wird der vorbestimmte Schwelldruck erneut überschritten, wird die Zeitmessung wieder in Gang gesetzt, wobei die jetzt ermittelte Zeit der bereits vorher gemessenen Zeit zuaddiert wird.When a predetermined threshold pressure in the associated pressure chamber 14, 15, the piezo-crystal 17 sends a signal to the evaluation unit 18. The threshold pressure corresponds approximately to the working pressure of the pressure medium cylinder 10 or is slightly lower. The clock, which measures the operating time, is now set in motion. As soon as the predetermined threshold pressure is fallen below again, the piezo-crystal 17 stops the clock of the evaluation unit 18. If the predetermined threshold pressure is exceeded again, the time measurement started again, the now determined time is added to the previously measured time.
Beim Zählen der Betriebszyklen wird in ähnlicher Weise vorgegangen. Jetzt wird bei Überschreiten des Schwelldrucks von unten her jedes Mal ein Zähler in der Auswerteeinheit 18 um „1" weitergesetzt. Alternativ kann die Zählung auch erfolgen, sobald der Schwelldruck von oben her wieder unterschritten wird, also bei nachlassendem Druck.When counting the operating cycles, the procedure is similar. Now, when the threshold pressure is exceeded, a counter is continuously incremented by "1" in the evaluation unit 18. Alternatively, the counting can also take place as soon as the threshold pressure is again undershot from above, ie when the pressure drops.
In der Auswerteeinheit 18 wird zusätzlich zu den Betriebszyklen und/oder der Betriebszeit auch eine herstellerspezifische Identifikationsnummer gespeichert. Die gespeicherten elektronischen Daten können dann beispielsweise über eine Infrarotschnittstelle, eine Bluetoothschnittstelle, induktiv oder mit jeder anderen geeigneten Technik an ein Lesegerät übertragen werden, wobei die vorstehend ausdrücklich genannten kabellosen Übertragungstechniken aus Einfachheitsgründen bevorzugt sind. Das Personal des Benutzers oder auch das Wartungspersonal des Herstellers kann so mit dem Lesegerät in vorgegebenen, kalendermäßig bestimmten Zeitintervallen die vorhandenen Druckmittelzylinder 10 abgehen und die Betriebsstunden und/oder Betriebszyklen auslesen. Dieses kann dann in einen Wartungsplan zur Planung der Wartung der einzelnen Druckmittelzylinder 10 übergeben werden. Bei vermeintlich vorzeitigem Versagen der Druckmittelzylinder lassen sich die Betriebszeit und/oder die Betriebszyklen ebenfalls sicher feststellen.In the evaluation unit 18, a manufacturer-specific identification number is stored in addition to the operating cycles and / or the operating time. The stored electronic data may then be transmitted to a reader via, for example, an infrared interface, a Bluetooth interface, inductive or any other suitable technique, the wireless transmission techniques expressly mentioned above being preferred for simplicity. The user's staff or even the maintenance personnel of the manufacturer can thus depart with the reader in predetermined, calendar-specific time intervals, the existing pressure medium cylinder 10 and read the operating hours and / or operating cycles. This can then be transferred to a maintenance plan for planning the maintenance of the individual pressure cylinder 10. With supposedly premature failure of the pressure cylinder, the operating time and / or the operating cycles can also be determined reliably.
Bei dem in Fig. 2 gezeigten Ausführungsbeispiel ist ein Druckaufnehmer 19 samt Auswerteeinheit 20 dem Kolben 13 zugeordnet, wobei nur Druckveränderungen in der dem Arbeitshub des Zylinders 10 zugeordneten Druckkammer 14 registriert werden. Der Druckaufnehmer ist in einer Bohrung 21 im Kolben 13 angeordnet und weist an seinem zur Druckkammer 14 weisenden Ende einen Piezo-Kristall 22 oder einen Stapel von Piezo-Kristallen auf. An der von dem Piezo-Kristall 22 oder dem Stapel abgewandten Seite ist die Auswerteeinheit 20 integriert und beispielsweise mittels einer Vergußmasse 23 zu dem Druckaufnehmer 19 vergossen.In the embodiment shown in FIG. 2, a pressure sensor 19 including evaluation unit 20 is associated with the piston 13, wherein only pressure changes in the working chamber of the cylinder 10 associated pressure chamber 14 are registered. The pressure sensor is arranged in a bore 21 in the piston 13 and has at its end facing the pressure chamber 14 a piezo-crystal 22 or a stack of piezoelectric crystals. At the side facing away from the piezo-crystal 22 or the stack side, the evaluation unit 20 is integrated and encapsulated, for example by means of a potting compound 23 to the pressure transducer 19.
Die Funktionsweise dieses Ausführungsbeispiels ist analog zu dem vorstehend anhand Fig. 1 beschriebenen Ausführungsbeispiel. Jeder Druckanstieg über einen vorbestimmten Schwelldruck wird registriert und zur Zählung und/oder Betriebsstundenzählung mittels der Auswerteeinheit 20 genutzt. Gegenüber dem anhand Fig. 1 erläuterten Ausführungsbeispiel hat diese Variante den Vorteil, daß die Auswerteeinheit 20 von außen nicht zugänglich und damit nur schwer manipulierbar ist. Das Auslesen der Auswerteeinheit 20 erfolgt durch das Wartungspersonal nach der Demontage des Druckmittelzylinders 10 oder auch über geeignete kabellose Lesegeräte von außen.The operation of this embodiment is analogous to the embodiment described above with reference to FIG. Each pressure increase over a predetermined threshold pressure is registered and used for counting and / or operating hours count by means of the evaluation unit 20. Compared to the illustrated with reference to FIG. 1 embodiment, this variant has the advantage that the evaluation unit 20 is not accessible from the outside and thus difficult to manipulate. The evaluation unit 20 is read by the Maintenance personnel after disassembly of the pressure cylinder 10 or via suitable wireless readers from the outside.
Nach einem besonders bevorzugten Ausführungsbeispiel ist vorgesehen, daß nur die Betriebszyklen gezählt werden. Diese Variante hat den Vorteil, daß keine Fremdenergie, beispielsweise durch eine Batterie, für den Betrieb der Auswerteeinheit 18 bzw. 20 erforderlich ist. Die zum Zählen erforderliche Energie wird von dem Piezo-Kristall 17 bzw. 22 oder dem Stapel von Piezo-Kristallen bereitgestellt. Wird der Druck im Druckmittelzylinder gehalten, erzeugen die Piezo- Kristalle 17 und 22 keine Energie. Dieses ist beim Zählen der Betriebszyklen unschädlich, da die Auswerteeinheit 18, 20 nämlich nur während des Zählvorganges mit Energie versorgt werden muß. Diese Variante bietet sich daher besonders in Verbindung mit dem Ausführungsbeispiel gemäß Fig. 2 an. According to a particularly preferred embodiment, it is provided that only the operating cycles are counted. This variant has the advantage that no external energy, for example, by a battery, for the operation of the evaluation unit 18 and 20 is required. The energy required for counting is provided by the piezo crystal 17 or 22 or the stack of piezo crystals. If the pressure is maintained in the pressure cylinder, the piezo crystals 17 and 22 generate no energy. This is harmless when counting the operating cycles, since the evaluation unit 18, 20 must be supplied with energy only during the counting process. This variant is therefore particularly suitable in connection with the exemplary embodiment according to FIG. 2.
B e z u g s z e i c h e n l i s t eC o m p a n c e m e n t i o n s
DruckmittelzylinderPressure cylinder
Gehäusecasing
Zylinderbohrungbore
Kolbenpiston
Druckraumpressure chamber
Druckraumpressure chamber
DruckaufnehmerPressure transducer
Piezo-KristallPiezo crystal
Auswerteeinheitevaluation
DruckaufnehmerPressure transducer
Auswerteeinheitevaluation
Bohrungdrilling
Piezo-KristallPiezo crystal
Vergußmasse sealing compound

Claims

P a t e n t a n s p r ü c h e : Patent claim:
1. Druckmittelzylinder mit einem beweglich in einer Zylinderbohrung (12) eines Gehäuses (1 1 ) geführten Kolben (13) und wenigstens einem Druckraum (14, 15), welcher zum Betätigen des Kolbens (13) mit Druckmittel beaufschlagbar ist, d a d u r c h g e k e n n z e i c h n e t , daß dem Druckraum (14, 15) ein Druckaufnehmer (16, 19) zugeordnet ist, mittels dessen Signale die Betriebszeit gemessen und/oder die Betriebszyklen gezählt werden.1. pressure medium cylinder with a movable in a cylinder bore (12) of a housing (1 1) guided piston (13) and at least one pressure chamber (14, 15) which is acted upon for actuating the piston (13) with pressure medium, characterized in that Pressure chamber (14, 15) is associated with a pressure transducer (16, 19), by means of which signals the operating time measured and / or the operating cycles are counted.
2. Druckmittelzylinder nach Anspruch 1 , dadurch gekennzeichnet, daß der Druckaufnehmer (16, 19) einen Piezo-Kristall (17, 22) aufweist.Second pressure cylinder according to claim 1, characterized in that the pressure transducer (16, 19) has a piezoelectric crystal (17, 22).
3. Druckmittelzylinder nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß jedem Druckraum (14, 15) ein Druckaufnehmer (16) zugeordnet ist.3. pressure cylinder according to claim 1 or 2, characterized in that each pressure chamber (14, 15) is associated with a pressure transducer (16).
4. Druckmittelzylinder nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Druckaufnehmer (19) im Kolben (13) angeordnet ist.4. pressure cylinder according to claim 1 or 2, characterized in that the pressure sensor (19) in the piston (13) is arranged.
5. Verfahren zum Erfassen der Betriebszeit und/oder Betriebszyklen eines Druckmittelzylinders (10), welcher einen beweglich in einer Zylinderbohrung (12) eines Gehäuses (1 1 ) geführten Kolben (13) und wenigstens einen Druckraum (14, 15) aufweist, welcher zum Betätigen des Kolbens (13) mit Druckmittel beaufschlagbar ist, dadurch gekennzeichnet, daß der Druck im Druckraum (14, 15) ermittelt und, ausgehend vom diesem Druck, die Betriebszeit und/oder Betriebszyklen gemessen und/oder gezählt werden.5. A method for detecting the operating time and / or operating cycles of a pressure medium cylinder (10) having a movably in a cylinder bore (12) of a housing (1 1) guided piston (13) and at least one pressure chamber (14, 15) which, for Actuating the piston (13) can be acted upon with pressure medium, characterized in that the pressure in the pressure chamber (14, 15) determined and, starting from this pressure, the operating time and / or operating cycles are measured and / or counted.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß bei Überschreiten eines vorbestimmten Schwelldruckes ein Betriebsstundenzähler (Uhr) gestartet und bei Unterschreiten des Schwelldrucks wieder gestoppt wird.6. The method according to claim 5, characterized in that when a predetermined threshold pressure is exceeded, an operating hours counter (clock) is started and stopped when falling below the threshold pressure again.
7. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß bei Überschreiten eines vorbestimmten Schwelldrucks ein Zähler für die Betriebszyklen um „1 " hochgesetzt wird.7. The method according to claim 5, characterized in that when a predetermined threshold pressure is exceeded, a counter for the operating cycles is increased by "1".
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß eine Auswerteeinheit (18, 20) zum Zählen der Betriebszyklen durch einen Piezo-Kristall (17, 22) im Druckaufnehmer (16, 19) mit Energie versorgt wird. 8. The method according to claim 7, characterized in that an evaluation unit (18, 20) for counting the operating cycles by a piezoelectric crystal (17, 22) in the pressure transducer (16, 19) is supplied with energy.
PCT/EP2006/067192 2005-10-10 2006-10-09 Pressurised medium cylinder and method for determining the operating time and/or cycles thereof WO2007042499A1 (en)

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