EP2272632B1 - System for recording vibrations - Google Patents

System for recording vibrations Download PDF

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Publication number
EP2272632B1
EP2272632B1 EP10166964.6A EP10166964A EP2272632B1 EP 2272632 B1 EP2272632 B1 EP 2272632B1 EP 10166964 A EP10166964 A EP 10166964A EP 2272632 B1 EP2272632 B1 EP 2272632B1
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EP
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Prior art keywords
vibration
dosimeter
load
transponder
rfid chip
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EP10166964.6A
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German (de)
French (fr)
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EP2272632A1 (en
Inventor
Josef Obermeier
Frank Despineux
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Hilti AG
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Hilti AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Definitions

  • the present invention relates to a system for detecting a vibration load of users, in particular in a hand tool machine, and a hand tool. Examples are out US7036703B2 . US2008 / 0252446A1 or DE10303005A1 known. Beats from striking hand tools impose a sustained load on a user due to vibration. The burdens are associated with clinical pictures. Limit values have been determined which should not be exceeded in order to protect a user against possible health damage. The limits take into account the duration of exposure and the intensity of the vibrations.
  • a dosimeter for detecting a current or accumulated load may be incorporated into a handheld power tool. However, this requires a high investment requirement for the users.
  • An object is to provide a retrofittable system for detecting a vibration load.
  • the transponder may include an RFID chip.
  • the transponder can be retrofitted in a simple manner for each hand tool, in particular, an RFID chip can be glued as a label on or in the housing of the power tool.
  • An inventive system for vibration detection, in particular for hitting hand tool machines includes a dosimeter for carrying by a user and a transponder for attachment to a hand tool, wherein in the transponder a parameter on a vibration load of the power tool is stored.
  • the transponder can contain an RFID chip.
  • the dosimeter may include a reader for an RFID chip.
  • the dosimeter has at least one acceleration sensor, an evaluation device for comparing detected vibrations with a threshold value, and an analysis device for determining a standardized load based on the received characteristic and a duration for which the vibrations are greater than the threshold value.
  • An inventive method for detecting a vibration load provides the following steps: readout of an RFID chip with an associated for a hand tool machine characteristic on their vibration load; Record a duration of a load by a vibration and determine a dose of the vibration load by the vibration based on the recorded duration and the read-out characteristic.
  • Fig. 1 shows an exemplary striking hand tool 10.
  • a motor 12, a drive train 13 and a pneumatic percussion 14 are integrated.
  • the pneumatic striking mechanism 14 beats periodically on a tool 15 which is mounted in a tool holder 16 on the hand tool 10.
  • the periodic beats lead to a vibration.
  • the vibration is at least partially transmitted to a handle 17, by means of which a user guides the power tool 10.
  • the vibrations lead to a significant physical Exposure to the user, which can lead to damage to the hands, arm joints and arms, especially in the case of continuous loading.
  • the vibrations may be caused by rotating tools.
  • the vibrations can also occur as a result of an interaction of hand tool and a workpiece to be machined.
  • Fig. 2 shows a dosimeter 20 that a user can wear on the arm, preferably on the wrist.
  • a housing 50 of the dosimeter 20 is provided, for example, with a band 21, a cuff and / or a clip (not shown).
  • the band 21 is designed, for example, as a bracelet.
  • the user fastens the dosimeter 20 by means of the band 51 equal to a clock on his wrist.
  • the user carries the dosimeter 20 on the hand with which he / she leads the power tool 10.
  • the dosimeter can also be worn on the lower or upper arm. Direct contact of the dosimeter 20 to the power tool 10 is not desired.
  • the dosimeter 20 includes one or more acceleration sensors 21 in its housing 50.
  • the acceleration sensors 21 sense the vibrations transmitted from the handheld power tool 10 to the user's arm via the hand.
  • An evaluation device 28 of the dosimeter 20 determines based on the detected vibrations, whether the user performs a hand-held power tool in hand-operated. The evaluation device 28 consequently recognizes that the user is exposed to a load due to vibrations.
  • a time detector 26 determines the duration of the load.
  • the evaluation device 28 may, for example, contain a discriminator 23 which compares the vibration signals 22 output by the acceleration sensor 21 with a threshold value.
  • the threshold value can be stored in a memory element 24 of the dosimeter 20 or permanently or variably stored in another suitable way.
  • the threshold value is chosen such that typical shocks and vibrations of hand tool machines in beating operation exceed the threshold value.
  • the discriminator 23 outputs a trigger signal 25 in response to the threshold value being exceeded or exceeded by the vibration signal 22.
  • the time detection device 26 of the dosimeter 20, the trigger signal 25 is supplied.
  • the time detecting means 26 detects a time period for which the vibration signal 22 exceeds the threshold value.
  • the time detection device 26 may, for example, a Memory module 27 included, in which the respective periods are optionally stored with date and time.
  • a simple analysis device 58 may be provided which determines, for example, the sum of the time periods over the current day, the last hour or another interval.
  • a display 29, for example, displays to the user the sum as a measure of the particular vibrations accumulated over the interval.
  • the display 29 can output, for example, an acoustically, optically or haptically detectable warning signal when a maximum load is reached or exceeded.
  • Another embodiment of the dosimeter 20 determines a normalized load from the duration of the detected vibrations.
  • Hand tool 10 have a typical for them each characteristic in terms of their vibration load for a user.
  • the typical parameter can be determined in standardized tests and, for example, given as acceleration values occurring on the handle.
  • the dosimeter 20 has an input device 70, via which the user can enter the typical parameters for a handheld power tool 10.
  • the analyzer 58 of the dosimeter 20 determines from the time periods and the input characteristic a current normalized load.
  • a transponder 30 with a RFID (Radio Frequency IDentification) chip 36 can be attached to or in the handheld power tool 10, for example glued.
  • the RFID chip 36 permanently stores an identifier that indicates a typical parameter about the vibration loads of a handheld power tool.
  • the typical parameter can be specified, for example, as an acceleration value on the handle of the handheld power tool.
  • Various RFID chips 36 can be provided for a variety of parameters. For each hand tool 10, a corresponding RFID chip 36 can be selected and the hand tool, so even later, equipped.
  • the dosimeter 20 includes a corresponding reading unit 60 for the transponder 30 for receiving the typical characteristic of the portable power tool 10.
  • the parameter transmitted can be stored by the dosimeter 20 in the memory element 24.
  • the analysis device 58 refers back to the stored parameter and determines based on the recorded duration of the load and the characteristic a normalized load.
  • the normalized load can be recorded and / or displayed.
  • the transponder 30 may be controlled by the dosimeter 20.
  • the reading unit 60 has an emitter 61 which outputs an electromagnetic high-frequency signal tuned to the transponder 30.
  • the transponder 30 transmits in response to the high frequency signal stored in the RFID chip 36 characteristic.
  • the reading unit 60 may be timed, e.g. every 30 minutes, the transponder 30 read. For example, readout may occur when the dosimeter is first started after a predetermined period of time, e.g. 10 minutes, a vibration recorded. A possible change of a hand tool device during a break could be detected thereby.
  • the transponder 30 is preferably a passive transponder 30 without an integrated battery or a wired power supply.
  • the transponder 30 contains a receiver coil 34 and a capacitor 35.
  • the high-frequency signal emitted by the emitter 61 serves to supply energy.
  • the receiver coil 34 inductively converts the high frequency signal into electrical charges that are buffered in the capacitor 35.
  • the high-frequency signal is emitted for a sufficient time to supply the RFID chip 36 with electrical energy for transmitting the characteristic stored in it.
  • the transponder 30 can also be supplied with power inductively by an exciter coil 80 in the handheld power tool 10.
  • the excitation coil 80 may be an additional coil.
  • the transponder 30 may transmit the characteristic when the motor 12 is rotating, i. the hand tool 10 is active.
  • the RFID chip 36 is an example of a wireless transponder. Alternatives are optical transponders, ultrasound transponders or transponders in a higher or lower frequency range.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft ein System zum Erfassen einer Vibrationsbelastung von Anwendern, insbesondere bei einer Handwerkzeugmaschine, und eine Handwerkzeugmaschine. Beispiele dafür sind aus US7036703B2 , US2008/0252446A1 oder DE10303005A1 bekannt. Schläge von schlagende Handwerkzeugmaschinen üben auf einen Anwender eine andauernde Belastung aufgrund von Vibrationen auf. Die Belastungen werden mit Krankheitsbildern in Verbindung gebracht. Es wurden Grenzwerte ermittelt, die nicht überschritten werden sollten, um einen Anwender vor einer möglichen gesundheitlichen Schädigung zu bewahren. Die Grenzwerte berücksichtigen die Dauer einer Einwirkung der Belastung und die Stärke der Vibrationen.The present invention relates to a system for detecting a vibration load of users, in particular in a hand tool machine, and a hand tool. Examples are out US7036703B2 . US2008 / 0252446A1 or DE10303005A1 known. Beats from striking hand tools impose a sustained load on a user due to vibration. The burdens are associated with clinical pictures. Limit values have been determined which should not be exceeded in order to protect a user against possible health damage. The limits take into account the duration of exposure and the intensity of the vibrations.

Ein Dosimeter zum Erfassen einer aktuellen oder akkumulierten Belastung kann in eine Handwerkzeugmaschine integriert werden. Dies erfordert jedoch einen hohen Investitionsbedarf für die Anwender.A dosimeter for detecting a current or accumulated load may be incorporated into a handheld power tool. However, this requires a high investment requirement for the users.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Eine Aufgabe besteht ist, ein nachrüstbares System zum Erfassen einer Vibrationsbelastung bereitzustellen.An object is to provide a retrofittable system for detecting a vibration load.

Eine erfindungsgemäße Handwerkzeugmaschine mit einem Transponder, in dem wenigstens eine Kenngröße über eine Vibrationsbelastung durch die Handwerkzeugmaschine auslesbar gespeichert ist. Der Transponder kann einen RFID-Chip beinhalten.A hand tool according to the invention with a transponder, in which at least one parameter is stored readable via a vibration load by the power tool. The transponder may include an RFID chip.

Der Transponder ist in einfacher Weise für jede Handwerkzeugmaschine nachrüstbar, insbesondere kann ein RFID-Chip als Etikette auf oder in dem Gehäuse der Handwerkzeugmaschine aufgeklebt werden.The transponder can be retrofitted in a simple manner for each hand tool, in particular, an RFID chip can be glued as a label on or in the housing of the power tool.

Ein erfindungsgemäßes System zur Vibrationserfassung, insbesondere für schlagende Handwerkzeugmaschinen beinhaltet ein Dosimeter zum Tragen durch einen Anwender und einen Transponder zum Befestigen an einer Handwerkzeugmaschine, wobei in dem Transponder eine Kenngröße über eine Vibrationsbelastung der Handwerkzeugmaschine gespeichert ist. Der Transponder kann einen RFID-Chip enthalten. Das Dosimeter kann ein Lesegerät für einen RFID-Chip enthalten.An inventive system for vibration detection, in particular for hitting hand tool machines includes a dosimeter for carrying by a user and a transponder for attachment to a hand tool, wherein in the transponder a parameter on a vibration load of the power tool is stored. The transponder can contain an RFID chip. The dosimeter may include a reader for an RFID chip.

Eine Ausgestaltung sieht vor, dass das Dosimeter wenigstens einen Beschleunigungssensor, eine Auswertungseinrichtung zum Vergleichen erfasster Vibrationen mit einem Schwellwert und eine Analyseeinrichtung zum Ermitteln einer normierten Belastung basierend auf der empfangenen Kenngröße und einer Dauer für die die Vibrationen größer als der Schwellwert sind, aufweist.An embodiment provides that the dosimeter has at least one acceleration sensor, an evaluation device for comparing detected vibrations with a threshold value, and an analysis device for determining a standardized load based on the received characteristic and a duration for which the vibrations are greater than the threshold value.

Ein erfindungsgemäßes Verfahren zum Erfassen einer Vibrationsbelastung sieht folgende Schritte vor: Auslesen eines RFID-Chips mit einer für eine Handwerkzeugmaschine zugehörigen Kenngröße über deren Vibrationsbelastung; Aufzeichnen eine Dauer einer Belastung durch eine Vibration und Bestimmen einer Dosis der Vibrationsbelastung durch die Vibration basierend auf der aufgezeichneten Dauer und der ausgelesenen Kenngröße.An inventive method for detecting a vibration load provides the following steps: readout of an RFID chip with an associated for a hand tool machine characteristic on their vibration load; Record a duration of a load by a vibration and determine a dose of the vibration load by the vibration based on the recorded duration and the read-out characteristic.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

Fig. 1
eine Handwerkzeugmaschine;
Fig. 2
ein Dosimeter.
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
Fig. 1
a hand tool;
Fig. 2
a dosimeter.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt eine beispielhafte schlagende Handwerkzeugmaschine 10. In einem Maschinengehäuse 11 sind ein Motor 12, ein Antriebstrang 13 und ein pneumatisches Schlagwerk 14 integriert. Das pneumatische Schlagwerk 14 schlägt periodisch auf ein Werkzeug 15, das in einer Werkzeugaufnahme 16 an der Handwerkzeugmaschine 10 gelagert ist. Die periodischen Schläge führen zu einer Vibration. Die Vibration überträgt sich zumindest teilweise auf einen Handgriff 17, mittels dem ein Anwender die Handwerkzeugmaschine 10 führt. Die Vibrationen führen zu einer erheblichen physischen Belastung des Anwenders, die insbesondere bei einer Dauerbelastung zu Schädigungen der Hände, Armgelenke und Arme führen kann. Fig. 1 shows an exemplary striking hand tool 10. In a machine housing 11, a motor 12, a drive train 13 and a pneumatic percussion 14 are integrated. The pneumatic striking mechanism 14 beats periodically on a tool 15 which is mounted in a tool holder 16 on the hand tool 10. The periodic beats lead to a vibration. The vibration is at least partially transmitted to a handle 17, by means of which a user guides the power tool 10. The vibrations lead to a significant physical Exposure to the user, which can lead to damage to the hands, arm joints and arms, especially in the case of continuous loading.

In anderen Handwerkzeugmaschinen können die Vibrationen durch drehende Werkzeuge entstehen. Die Vibrationen können auch in Folge einer Wechselwirkung von Handwerkzeugmaschine und einem zu bearbeitenden Werkstück auftreten.In other hand tool machines, the vibrations may be caused by rotating tools. The vibrations can also occur as a result of an interaction of hand tool and a workpiece to be machined.

Fig. 2 zeigt ein Dosimeter 20, das ein Anwender am Arm, vorzugsweise am Handgelenk, tragen kann. Ein Gehäuse 50 des Dosimeters 20 ist beispielsweise mit einem Band 21, einer Manschette und/oder einem Klipp (nicht dargestellt) versehen. Das Band 21 ist beispielsweise als Armband ausgestaltet. Der Anwender befestigt das Dosimeter 20 mittels des Bandes 51 gleich einer Uhr an seinem Handgelenk. Vorzugsweise trägt der Anwender das Dosimeter 20 an der Hand mit der er/sie die Handwerkzeugmaschine 10 führt. Das Dosimeter kann auch am Unter- oder Oberarm getragen werden. Ein direkter Kontakt des Dosimeters 20 zu der Handwerkzeugmaschine 10 ist nicht erwünscht. Fig. 2 shows a dosimeter 20 that a user can wear on the arm, preferably on the wrist. A housing 50 of the dosimeter 20 is provided, for example, with a band 21, a cuff and / or a clip (not shown). The band 21 is designed, for example, as a bracelet. The user fastens the dosimeter 20 by means of the band 51 equal to a clock on his wrist. Preferably, the user carries the dosimeter 20 on the hand with which he / she leads the power tool 10. The dosimeter can also be worn on the lower or upper arm. Direct contact of the dosimeter 20 to the power tool 10 is not desired.

In einer Ausführungsform beinhaltet das Dosimeter 20 einen oder mehrere Beschleunigungssensoren 21 in seinem Gehäuse 50. Die Beschleunigungssensoren 21 erfassen die Vibrationen, die von der Handwerkzeugmaschine 10 über die Hand auf den Arm des Anwenders übertragen werden. Eine Auswertungseinrichtung 28 des Dosimeters 20 bestimmt basierend auf den erfassten Vibrationen, ob der Anwender eine im schlagenden Betrieb befindliche Handwerkzeugmaschine führt. Die Auswertungseinrichtung 28 erkennt folglich, dass der Anwender einer Belastung durch Vibrationen ausgesetzt ist. Eine Zeiterfassungseinrichtung 26 bestimmt die Dauer der Belastung.In one embodiment, the dosimeter 20 includes one or more acceleration sensors 21 in its housing 50. The acceleration sensors 21 sense the vibrations transmitted from the handheld power tool 10 to the user's arm via the hand. An evaluation device 28 of the dosimeter 20 determines based on the detected vibrations, whether the user performs a hand-held power tool in hand-operated. The evaluation device 28 consequently recognizes that the user is exposed to a load due to vibrations. A time detector 26 determines the duration of the load.

Die Auswertungseinrichtung 28 kann beispielsweise einen Diskriminator 23 enthalten, der die von dem Beschleunigungssensor 21 ausgegebenen Vibrationssignale 22 mit einem Schwellwert vergleicht. Der Schwellwert kann in einem Speicherelement 24 des Dosimeters 20 gespeichert oder in einer anderen geeigneten Weise permanent oder veränderbar hinterlegt sein. Der Schwellwert ist derart gewählt, dass typische Erschütterungen und Vibrationen von Handwerkzeugmaschinen im schlagenden Betrieb den Schwellwert überschreiten. Der Diskriminator 23 gibt ein Triggersignal 25 ansprechend auf ein Unter- oder Überschreiten des Schwellwerts durch das Vibrationssignal 22 aus. Der Zeiterfassungseinrichtung 26 des Dosimeters 20 wird das Triggersignal 25 zugeführt. Die Zeiterfassungseinrichtung 26 erfasst eine Zeitspanne für die das Vibrationssignal 22 den Schwellwert überschreitet. Die Zeiterfassungseinrichtung 26 kann beispielsweise ein Speichermodul 27 enthalten, in das die jeweiligen Zeitspannen gegebenenfalls mit Datum und Uhrzeit abspeichert werden.The evaluation device 28 may, for example, contain a discriminator 23 which compares the vibration signals 22 output by the acceleration sensor 21 with a threshold value. The threshold value can be stored in a memory element 24 of the dosimeter 20 or permanently or variably stored in another suitable way. The threshold value is chosen such that typical shocks and vibrations of hand tool machines in beating operation exceed the threshold value. The discriminator 23 outputs a trigger signal 25 in response to the threshold value being exceeded or exceeded by the vibration signal 22. The time detection device 26 of the dosimeter 20, the trigger signal 25 is supplied. The time detecting means 26 detects a time period for which the vibration signal 22 exceeds the threshold value. The time detection device 26 may, for example, a Memory module 27 included, in which the respective periods are optionally stored with date and time.

In dem Dosimeter 20 kann eine einfache Analyseeinrichtung 58 vorgesehen sein, die beispielsweise die Summe der Zeitspannen über den aktuellen Tag, die letzte Stunde oder ein anderes Intervall bestimmt. Eine Anzeige 29 zeigt dem Anwender beispielsweise die Summe als Maß für die jeweiligen über das Intervall akkumulierten Vibrationen an. Die Anzeige 29 kann beispielsweise ein akustisch, optisch oder haptisch erfassbares Warnungsignal ausgeben, wenn eine Maximalbelastung erreicht oder überschritten wird.In the dosimeter 20, a simple analysis device 58 may be provided which determines, for example, the sum of the time periods over the current day, the last hour or another interval. A display 29, for example, displays to the user the sum as a measure of the particular vibrations accumulated over the interval. The display 29 can output, for example, an acoustically, optically or haptically detectable warning signal when a maximum load is reached or exceeded.

Eine weitere Ausgestaltung des Dosimeters 20 ermittelt aus der Dauer der erfassten Vibrationen eine normierte Belastung. Handwerkzeugmaschinen 10 weisen eine für sie jeweils typische Kenngröße hinsichtlich ihrer Vibrationsbelastung für einen Anwender auf. Die typische Kenngröße kann in standardisierten Tests bestimmt und beispielsweise als am Handgriff auftretende Beschleunigungswerte angegeben werden.Another embodiment of the dosimeter 20 determines a normalized load from the duration of the detected vibrations. Hand tool 10 have a typical for them each characteristic in terms of their vibration load for a user. The typical parameter can be determined in standardized tests and, for example, given as acceleration values occurring on the handle.

Das Dosimeter 20 weist eine Eingabevorrichtung 70 auf, über die der Anwender die für eine Handwerkzeugmaschine 10 typischen Kenngrößen eingeben kann. Die Analyseeinrichtung 58 des Dosimeters 20 ermittelt aus den Zeitspannen und der eingegebenen Kenngröße eine aktuelle normierte Belastung.The dosimeter 20 has an input device 70, via which the user can enter the typical parameters for a handheld power tool 10. The analyzer 58 of the dosimeter 20 determines from the time periods and the input characteristic a current normalized load.

Ein Transponder 30 mit einem RFID (Radio Frequency IDentification)- Chip 36 kann an oder in der Handwerkzeugmaschine 10 befestigt, z.B. angeklebt werden. Der RFID-Chip 36 speichert permanent eine Kennung, die eine typische Kenngröße über die Vibrationsbelastungen einer Handwerkzeugmaschine angibt. Die typische Kenngröße kann beispielsweise als ein Beschleunigungswert an dem Handgriff der Handwerkzeugmaschine angegeben werden. Es können verschiedene RFID-Chips 36 für vielfältige Kenngrößen bereitgestellt werden. Für jede Handwerkzeugmaschine 10 kann ein entsprechender RFID-Chip 36 ausgewählt und die Handwerkzeugmaschine damit, auch nachträglich, ausgestattet werden. Das Dosimeter 20 beinhaltet eine entsprechende Leseeinheit 60 für den Transponder 30 zum Empfangen der typischen Kenngröße der Handwerkzeugmaschine 10. Die übermittelte Kenngröße kann das Dosimeter 20 in dem Speicherelement 24 speichern. Die Analyseeinrichtung 58 greift auf die gespeicherte Kenngröße zurück und ermittelt anhand der erfassten Dauer der Belastung und der Kenngröße eine normierte Belastung. Die normierte Belastung kann aufgezeichnet und/oder angezeigt werden.A transponder 30 with a RFID (Radio Frequency IDentification) chip 36 can be attached to or in the handheld power tool 10, for example glued. The RFID chip 36 permanently stores an identifier that indicates a typical parameter about the vibration loads of a handheld power tool. The typical parameter can be specified, for example, as an acceleration value on the handle of the handheld power tool. Various RFID chips 36 can be provided for a variety of parameters. For each hand tool 10, a corresponding RFID chip 36 can be selected and the hand tool, so even later, equipped. The dosimeter 20 includes a corresponding reading unit 60 for the transponder 30 for receiving the typical characteristic of the portable power tool 10. The parameter transmitted can be stored by the dosimeter 20 in the memory element 24. The analysis device 58 refers back to the stored parameter and determines based on the recorded duration of the load and the characteristic a normalized load. The normalized load can be recorded and / or displayed.

Der Transponder 30 kann durch das Dosimeter 20 gesteuert werden. Die Leseeinheit 60 weist einen Emitter 61 auf, der ein auf den Transponder 30 abgestimmtes elektromagnetisches Hochfrequenzsignal ausgibt. Der Transponder 30 übermittelt ansprechend auf das Hochfrequenzsignal die in dem RFID-Chip 36 gespeicherte Kenngröße. Die Leseeinheit 60 kann beispielsweise zeitgesteuert, z.B. alle 30 Minuten, den Transponder 30 auslesen. Ein Auslesen kann beispielsweise erfolgen, wenn das Dosimeter erstmals nach einer vorgegebenen Zeitspanne, z.B. 10 Minuten, eine Vibration erfasst. Ein möglicher Wechsel eines Handwerkzeuggeräts während einer Arbeitspause könnte hierdurch erfasst werden.The transponder 30 may be controlled by the dosimeter 20. The reading unit 60 has an emitter 61 which outputs an electromagnetic high-frequency signal tuned to the transponder 30. The transponder 30 transmits in response to the high frequency signal stored in the RFID chip 36 characteristic. The reading unit 60 may be timed, e.g. every 30 minutes, the transponder 30 read. For example, readout may occur when the dosimeter is first started after a predetermined period of time, e.g. 10 minutes, a vibration recorded. A possible change of a hand tool device during a break could be detected thereby.

Der Transponder 30 ist vorzugsweise ein passiver Transponder 30 ohne integrierte Batterie oder eine drahtgebundene Energieversorgung. Der Transponder 30 enthält hierfür eine Empfängerspule 34 und einen Kondensator 35. Das von dem Emitter 61 ausgesandte Hochfrequenzsignal dient der Energieversorgung. Die Empfängerspule 34 wandelt das Hochfrequenzsignal induktiv in elektrische Ladungen, die in dem Kondensator 35 gepuffert werden. Das Hochfrequenzsignal wird ausreichend lange ausgestrahlt, um den RFID-Chip 36 mit elektrischer Energie zum Aussenden der in ihm gespeicherten Kenngröße zu versorgen.The transponder 30 is preferably a passive transponder 30 without an integrated battery or a wired power supply. For this purpose, the transponder 30 contains a receiver coil 34 and a capacitor 35. The high-frequency signal emitted by the emitter 61 serves to supply energy. The receiver coil 34 inductively converts the high frequency signal into electrical charges that are buffered in the capacitor 35. The high-frequency signal is emitted for a sufficient time to supply the RFID chip 36 with electrical energy for transmitting the characteristic stored in it.

Der Transponder 30 kann auch durch eine Erregerspule 80 in der Handwerkzeugmaschine 10 induktiv mit Strom versorgt werden. Die Erregerspule 80 kann eine zusätzliche Spule sein. Alternativ können z.B. die elektromagnetischen Felder des Motors 12 zur Energieversorgung herangezogen werden. Insbesondere kann der Transponder 30 die Kenngröße übertragen, wenn der Motor 12 sich dreht, d.h. die Handwerkzeugmaschine 10 aktiv ist.The transponder 30 can also be supplied with power inductively by an exciter coil 80 in the handheld power tool 10. The excitation coil 80 may be an additional coil. Alternatively, e.g. the electromagnetic fields of the motor 12 are used for power supply. In particular, the transponder 30 may transmit the characteristic when the motor 12 is rotating, i. the hand tool 10 is active.

Der RFID-Chip 36 ist ein Beispiel für einen drahtlosen Transponder. Alternativen sind optische Transponder, Ultraschalltransponder oder Transponder in einem höheren oder niederen Frequenzbereich.The RFID chip 36 is an example of a wireless transponder. Alternatives are optical transponders, ultrasound transponders or transponders in a higher or lower frequency range.

Claims (4)

  1. System for detecting vibration, particularly for striking hand machine tools, with a dosimeter for carrying on the arm by a user and a transponder for fastening to a hand machine tool, in which a characteristic variable for a vibration load of the hand machine tool is stored in the transponder, characterised in that the dosimeter has at least an acceleration sensor (21), an evaluation device (28) for comparing vibrations detected with a threshold value and a means of analysis (58) for establishing a standardised load based on the characteristic variables received and a duration for which the vibrations are greater than the threshold value.
  2. System according to claim 1, characterised in that the transponder contains an RFID chip.
  3. System according to claim 2, characterised in that the dosimeter contains a reader for an RFID chip.
  4. Method for detecting a vibration load with the steps:
    Reading an RFID chip with a characteristic variable belonging to a hand machine tool for its vibration load;
    Detecting a vibration by means of a dosimeter carried on the arm
    Recording a duration for which a load exceeds a threshold value through the vibration and
    Determining a dose for the vibration load through the vibration based on the duration recorded and the characteristic variable read.
EP10166964.6A 2009-07-09 2010-06-23 System for recording vibrations Active EP2272632B1 (en)

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DE102009027587A DE102009027587A1 (en) 2009-07-09 2009-07-09 System for vibration detection

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