EP2130008A1 - Dosimètre de vibrations pour la détermination de contraintes vibratoires - Google Patents

Dosimètre de vibrations pour la détermination de contraintes vibratoires

Info

Publication number
EP2130008A1
EP2130008A1 EP08708930A EP08708930A EP2130008A1 EP 2130008 A1 EP2130008 A1 EP 2130008A1 EP 08708930 A EP08708930 A EP 08708930A EP 08708930 A EP08708930 A EP 08708930A EP 2130008 A1 EP2130008 A1 EP 2130008A1
Authority
EP
European Patent Office
Prior art keywords
vibration
tool
measuring
dosimeter according
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP08708930A
Other languages
German (de)
English (en)
Inventor
Ulrich Single
Juergen Lennartz
Markus Roth
Stefan Holst
Andreas Strasser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2130008A1 publication Critical patent/EP2130008A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector

Definitions

  • the invention relates to a vibration dosimeter for
  • a device for personal measurement of vibration loads which act on the hand, the arm or the whole body of a person operating a vibrating tool.
  • the device comprises various sensors via which, in addition to the detection of vibration measurement values, other physical variables such as e.g. the temperature can be recorded.
  • the entire device is held by the operator in the hand to determine the vibration load of the operator.
  • Vibration generating machine should no longer be required.
  • Vibration stress due to the lack of contact with the vibration generating tool can only be determined with a relatively large uncertainty.
  • the invention is based on the object with simple measures to be implemented a vibration dosimeter for
  • the vibration dosimeter according to the invention for determining the vibration load of persons who are exposed to mechanical vibrations by the operation of a tool comprises a measuring device for determining the operating state (tool under load, idling and possibly determining the operating mode), an operating time determining device for determining the effective operating time the tool, a computer device for calculating a current load value from the effective operating time and a tool-specific and possibly also mode-specific vibration characteristic, an evaluation device for comparing the current load value with allowable load limits and a display and / or shutdown device, via which the current status is displayed and / or the tool is switched off when the load limit is exceeded.
  • a memory device for storing and reading out older load values is advantageously provided.
  • this memory device it is possible to store load values from different work phases and to take them into account again when resuming work on a vibration-generating tool. This allows a continuous continuation in the determination of the load value taking into account previous work on the same or on different tools. In contrast to embodiments of the prior art are thus after switching off or the change of a tool loads to which the operator was exposed, not lost, but will continue to be considered cumulatively. Storing in or reading from the memory ensures that the total vibration load for the respective operator can be determined.
  • the stored data e.g. cumulative vibration load, vibration load as a function of time, devices used and their mode of operation over time with the help of a computer (PC, PDA or the like) are read out and documented.
  • the permissible working time on the tool may also be a function of a tool-specific and possibly mode-specific
  • Vibrational characteristic and the defined limits are calculated.
  • the evaluation device then compares the effective operating time with the permissible working time, which can be calculated as a function of a permissible vibration characteristic value.
  • the display device represents the comparison result.
  • the measuring device and the display device are designed as physically separate from each other formed components, the display device communicates wirelessly with at least one of the other devices.
  • This design is characterized by a high level of user-friendliness, since the display device as a separate component independent of the vibrator
  • Tool can be carried. It is particularly possible that the operator, the display unit directly on - A -
  • the measuring device which is designed by the display device as a separate unit, can be arranged directly on or in the vibration generating tool, optionally also an arrangement in the power cord in question.
  • the separately executed display device may have an alarm function, which generates an acoustic, optical and / or haptic alarm additionally or alternatively to the display when reaching or exceeding a set limit.
  • limit values are taken into account for the triggering or exposure limit values to be determined in accordance with EU regulations, with other limit values in principle also being considered.
  • Another advantage of the vibratory dosimeter according to the invention lies in the simple change between different tools, the vibration load for the operator to be considered. Due to the wireless communication between the display device and at least one further module of the vibratory dosimeter, the display device can be easily changed between different Dosimeter wornen on different tools. In principle, it is sufficient to leave the respective measuring device on the relevant tool and to allow the display device carried by the operator to communicate with the measuring device on the new tool only when a new tool is put into operation. This is a particularly simple and user-friendly way to determine occurring loads on vibration generating tools.
  • Units of the vibratory dosimeter are transferred from tool to tool. Also with a transfer of all building units the advantage of user and user-friendliness remains, since due to the wireless communication, the display device can basically be carried at will by the operator.
  • the display device with the evaluation and preferably also with the
  • the measuring device is responsible only for determining the operating state (tool under load or idle and possibly the operating mode) of the tool or an equivalent value, which is transmitted wirelessly to the other, separately executed units.
  • the effective operating time of the tool is determined in the operating time determining device, from which the actual load value is then calculated with the aid of a tool-specific and possibly also a mode-specific vibration characteristic value in the arithmetic unit.
  • These vibration characteristics are sent either wirelessly by the measuring unit or the measuring unit sends an identification signal to the separate unit in which the vibration characteristics are stored for different tools.
  • the evaluation device compares the current cumulative load value with limit values and the display device displays the current status.
  • the permissible working time on the tool can also be calculated as a function of a tool-specific and possibly also of a mode-specific vibration characteristic value.
  • the evaluation device then compares the effective one
  • Operating time with the permissible working time which is a function of a tool-specific and possibly also a can be calculated according to the specific operating vibration parameter and the defined limit values.
  • the display device represents the comparison result.
  • a so-called triggering limit value and an exposure limit value can be used depending on the tool-specific and possibly also the farm-specific vibration characteristic value, a first alarm being generated when the triggering limit value is reached and further measures until reaching the exposure limit value towards the shutdown of the tool can be taken.
  • the measuring device to be arranged on the tool can be made relatively small building, which is the integration into the housing or facilitates the attachment to the housing of the tool.
  • the operation time determining means may obtain information from various measuring means.
  • the measuring device is designed as an acceleration sensor for determining the occurring accelerations, which has the advantage that the amplitude and frequency of the measured
  • Acceleration values an additional weighting or classification into different vibration categories is possible. But it may also be sufficient to distinguish only on-off operating states of the tool and possibly another one
  • the measuring device is fed by the voltage to be generated in a piezoelectric element, wherein the piezoelectric element is integrated into the measuring device and uses the oscillations or vibrations of the tool for voltage generation via the piezoelectric effect.
  • the piezoelectric element also takes over the sensor function.
  • the wireless communication between the separately executed display device and the at least one further device is designed as a Bluetooth, WLan, infrared, ultrasound or radio interface and includes corresponding transmitting and receiving units both on the side of the display device as well as on the side at least one further device, in particular the measuring device.
  • the measuring device is releasably attached to the housing of the tool, for example by means of magnets, a plug-in device, a snap device, screws or the like.
  • the attachment outside the housing also provides a user-friendly solution, since the measuring device can be detached from the housing with little effort and arranged on another tool. Additional measures for integration into the housing interior are not required.
  • the measuring device expediently remains permanently in or on the housing, it is merely carried out the display device and possibly connected to the display device further facilities transportable.
  • the measuring device is removed from the housing after use of the tool.
  • the vibration load can be represented, for example, as a daily vibration load in the form of a frequency-weighted, energy-equivalent 8-h total oscillation value A (8) (according to Directive 2002/44 / EC) or as a point value (eg according to DIN V 45694).
  • the load values can be accumulated or else deducted from a type of user account.
  • FIG. 1 is a schematic representation of a hand tool with a vibration dosimeter for determining the vibration load of the person working, wherein the vibration dosimeter is designed in two parts and includes a measuring device which is integrated into the housing of the tool, as well as an executed as a separate component display device,
  • FIG. 2 shows a representation corresponding to FIG. 1, wherein the measuring device is fastened on the outside of the housing of the tool (detachable or non-detachable, for example adhesively bonded),
  • FIG. 3 is a schematic representation of the two-part vibration dosimeter, consisting of the measuring device, which is mounted in or on the housing of the tool, and the display device, which with a computer device, a service life
  • Determining device and an evaluation device is combined to form a common unit, said unit communicates wirelessly with the measuring device.
  • the operator 1 shown in Fig. 1 operates on a hand-held, electrically operated tool 2, which is designed in the embodiment as a hammer drill.
  • a vibration dosimeter 3 is provided, which is constructed in two parts and comprises two separate units 4 and 5, wherein the unit 4 is designed as a measuring device and the unit 5 includes at least one display device via which the current vibration load is displayed.
  • the vibration dosimeter 3 comprises a computer device for calculating the vibration load or the permissible working time on the tool 2 as a function of a tool-specific or possibly mode-specific vibration characteristic value and an evaluation device for comparing the current cumulative vibration load with the limit values and / or for comparing the effective ones Operating time with the permissible working time.
  • these further devices are expediently integrated into the unit 5 comprising the display device; but it is also possible to integrate into the unit 4 comprising the measuring unit or a division into the units 4 and 5.
  • the measuring device 4 is integrated in the interior of the housing 7 of the tool 2.
  • the communication with the separate unit 5, which is carried for example by the operator 1, takes place wirelessly; shown are radio waves 6, via which the measuring device determined by the operating state (tool under load, idle and possibly the operating mode) and the tool-specific vibration characteristic and / or an identification code of the tool is transmitted to the unit 5.
  • the transmission takes place from the structural unit 4 in the housing 7 of the tool 2 to the structural unit 5, optionally also a transmission in the opposite direction is considered, for example, for the transmission of a
  • Deactivation signal for switching off the tool 2 in the event of reaching a critical limit In the exemplary embodiment according to FIG. 2, in contrast to the preceding embodiment shown in FIG. 1, the measuring device 4 is detachably arranged on the outside of the housing 7 of the tool 2, for example via screws.
  • the other structure of the vibratory dosimeter 3 corresponds to that of the previous embodiment.
  • two units 4 and 5 executed separately from each other are provided, which communicate with each other wirelessly via radio waves 6.
  • the vibration dosimeter 3 is shown schematically in single representation.
  • the two units 4 and 5 communicating with each other via the radio waves 6 each comprise different devices which are required to determine the permissible vibration load.
  • a measuring unit 11 is provided, for example, an acceleration sensor for determining the accelerations occurring at the tool or a measuring unit for determining the speed at different loads or the current current consumption of the motor of the tool.
  • the measuring device 4 is associated with a piezoelectric element 12, which converts due to the piezoelectric effect caused by the vibrations of the tool shifts in an electrical voltage, which is used to power the components in the measuring device 4.
  • Vibration load reaches a critical value.
  • the wireless communication takes place in accordance with the radio waves 6 not only from the measuring device 4, starting from the unit 5, but also in the opposite direction to transmit a signal generated in the unit 5 for switching off the tool to the unit 4 and the shutdown device integrated there ,
  • the measuring signals recorded by the measuring unit 11 are transmitted wirelessly via the radio waves 6 to the unit 5 and evaluated there.
  • the assembly 5 comprises an operating time determining device 5a, a computer device 8, by means of which the current cumulative vibration load and / or the permissible working time on the tool is calculated, an evaluation device 9 in which the current cumulative load is compared with limit values and / or the effective operating time is compared with the allowable working time, a display device 10 for displaying the current vibration load or at least reaching a load limit and a memory device 13th
  • the computer device 8 which may optionally be implemented with the evaluation device 9 in a common processor, determines the load value and / or the maximum working time as a function of a tool-specific and possibly also mode-specific vibration characteristic, which is usually specified by the tool manufacturer and characterizes the tool-specific vibration load , With knowledge of this vibration characteristic or these vibration characteristics, the maximum allowable working time can be determined on the tool in question.
  • the measuring device determines the operating state of the tool and transmits it by radio to the operating time determining device, which determines the actual or effective operating life of the tool.
  • the current vibration load is compared with the limits and / or it is the effective working time with the calculated allowable
  • the current status can then be displayed in the display device 10. If necessary, upon reaching or exceeding a limit value in the evaluation device 9, a signal for switching off the tool is generated, which is transmitted via the radio waves 6 back to the assembly 4 and a shutdown device integrated there.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measurement Of Radiation (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

Dosimètre de vibrations (3) pour la détermination des contraintes vibratoires auxquelles sont soumises des personnes exposées à des vibrations mécaniques dues au fonctionnement d'un outil (2), comprenant un dispositif de mesure (4) pour déterminer le mode de fonctionnement de l'outil, un dispositif de calcul (8) pour calculer la valeur de contrainte cumulative actuelle, un dispositif d'évaluation (9) pour comparer la valeur de contrainte cumulative actuelle aux valeurs limites définies et un dispositif d'affichage (5) pour afficher l'état actuel, le dispositif de mesure et le dispositif d'affichage étant réalisés comme des composants distincts et le dispositif d'affichage communiquant sans fil avec au moins un des autres dispositifs.
EP08708930A 2007-03-26 2008-02-13 Dosimètre de vibrations pour la détermination de contraintes vibratoires Ceased EP2130008A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710014894 DE102007014894A1 (de) 2007-03-26 2007-03-26 Vibrationsdosimeter zur Ermittlung der Vibrationsbelastung
PCT/EP2008/051706 WO2008116696A1 (fr) 2007-03-26 2008-02-13 Dosimètre de vibrations pour la détermination de contraintes vibratoires

Publications (1)

Publication Number Publication Date
EP2130008A1 true EP2130008A1 (fr) 2009-12-09

Family

ID=39356626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708930A Ceased EP2130008A1 (fr) 2007-03-26 2008-02-13 Dosimètre de vibrations pour la détermination de contraintes vibratoires

Country Status (4)

Country Link
EP (1) EP2130008A1 (fr)
DE (1) DE102007014894A1 (fr)
RU (1) RU2009139290A (fr)
WO (1) WO2008116696A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2498143A (en) * 2008-10-07 2013-07-03 Beckwith Ip Ltd Vibration exposure monitoring device for a tool
DE102009027585A1 (de) * 2009-07-09 2011-01-13 Hilti Aktiengesellschaft Dosimeter
DE102009028547B4 (de) 2009-08-14 2022-03-31 Robert Bosch Gmbh Vibrationsbestimmungseinrichtung zur Ermittlung der Vibrationsbelastung von Personen
DE102010031455A1 (de) * 2010-07-16 2012-01-19 Deere & Company Einrichtung zur Ermittlung einer Schwingungsdosis
FR2965958B1 (fr) * 2010-10-08 2013-05-31 Prospection & Inventions Systeme de dosage des vibrations d'un outil
EP2873492A1 (fr) * 2013-11-19 2015-05-20 HILTI Aktiengesellschaft Procédé de commande d'un dosimètre à vibration
DE102015226183A1 (de) 2015-12-21 2017-06-22 Robert Bosch Gmbh Verfahren zu einem Betrieb von zumindest einer Handwerkzeugmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6490929B1 (en) * 1995-03-22 2002-12-10 Bg Transco Plc Vibration dosimeter worn by an operator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6006164A (en) * 1997-07-22 1999-12-21 Skf Condition Monitoring, Inc. Portable vibration monitor
DE10119252A1 (de) 2001-04-11 2002-11-21 Klaus-Thomas Schenk Einrichtung zur personengebundenen Messung von Kennwerten der Hand- Arm- und Ganzkörperschwingungsbelastung an Arbeitsplätzen (Schwingungsdosimeter)
DE10303006B4 (de) 2003-01-27 2019-01-03 Hilti Aktiengesellschaft Handgeführtes Arbeitsgerät
GB2418252A (en) * 2004-09-16 2006-03-22 Peter Rawlings Measuring the operational time of a tool
ATE549608T1 (de) * 2004-12-14 2012-03-15 Fiat Ricerche Ein verfahren und eine vorrichtung zur überwachung der belastung von einem fahrzeuginsassen durch mechanische vibrationen und ein fahrzeug mit einer solchen überwachungsvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6490929B1 (en) * 1995-03-22 2002-12-10 Bg Transco Plc Vibration dosimeter worn by an operator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008116696A1 *

Also Published As

Publication number Publication date
DE102007014894A1 (de) 2008-10-02
RU2009139290A (ru) 2011-05-10
WO2008116696A1 (fr) 2008-10-02

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