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EP2884464A1 - Compteur d'événements avec capteur magnétique - Google Patents

Compteur d'événements avec capteur magnétique Download PDF

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Publication number
EP2884464A1
EP2884464A1 EP13197045.1A EP13197045A EP2884464A1 EP 2884464 A1 EP2884464 A1 EP 2884464A1 EP 13197045 A EP13197045 A EP 13197045A EP 2884464 A1 EP2884464 A1 EP 2884464A1
Authority
EP
European Patent Office
Prior art keywords
magnetic field
counter
machine tool
signal value
electric motor
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.)
Withdrawn
Application number
EP13197045.1A
Other languages
German (de)
English (en)
Inventor
Gerhard Greisl
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP13197045.1A priority Critical patent/EP2884464A1/fr
Priority to PCT/EP2014/076981 priority patent/WO2015086563A1/fr
Publication of EP2884464A1 publication Critical patent/EP2884464A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
    • G07C3/08—Registering or indicating the production of the machine either with or without registering working or idle time
    • G07C3/10—Registering or indicating the production of the machine either with or without registering working or idle time using counting means
    • 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 measuring device for detecting a number of switch operations in a machine tool having an electric motor and an operating switch for activating the electric motor. Moreover, the present invention relates to a method for detecting and displaying a number of switch operations in a machine tool having an electric motor and an operation switch for activating the electric motor.
  • the machine tool should therefore be inspected and maintained at regular intervals.
  • the measurement of these regular time intervals involves some difficulties.
  • the machine tools are serviced after predetermined periods of time (e.g., weeks or months) when the machine tool is owned by a user.
  • the failure to be able to grasp the actual time of use of a machine tool is the reason that the operating costs of a machine tool are significantly increased and at the same time the operational readiness or availability of the machine tool is greatly reduced.
  • a measuring device for detecting the running time of a number of switch operations in a machine tool having an electric motor and an operating switch for activating the electric motor is provided.
  • the inventive measuring device can effectively detect the number of switch operations in a machine tool and thus the actual use of the machine tool based on a magnetic field generated in the electric motor. Since the activation of the electric motor is absolutely necessary for the operation of the machine tool, the magnetic field or the magnetic field generated inevitably by the electric motor Detecting be used by means of a sensor as evidence of the operation of the machine tool.
  • the senor is realized by a magnetic field sensor.
  • the magnetic field sensor can be realized for example in the form of a Hall sensor.
  • the use of a Hall sensor provides a particularly convenient and easy-to-use sensor.
  • the signal value generated by the sensor may be realized in the form of a voltage value.
  • the signal value generated by the sensor can be effectively compared with a previously stored reference voltage in the comparator circuit.
  • the inventive method can effectively detect the number of switch operations in a machine tool and thus the actual use of the machine tool based on a magnetic field generated in the electric motor. Since the activation of the electric motor is absolutely necessary for operating the machine tool, the magnetic field or its detection necessarily generated by the electric motor can be used as proof for the operation of the machine tool.
  • the signal value is realized in the form of a voltage value.
  • the signal value generated by the sensor can be effectively compared with a previously stored reference voltage in the comparator circuit.
  • Fig. 1 shows a machine tool 1 in the form of a battery-operated screwdriver.
  • machine tools such as drills, rotary hammers, saws, grinding machines or the like.
  • the machine tool can also be operated by a mains voltage as an alternative to the rechargeable battery or in addition to the rechargeable battery.
  • the machine tool 1 contains a corresponding power cable for connecting the machine tool to a mains voltage source. The power cord and the mains voltage source are not shown in the figures.
  • the machine tool 1 essentially comprises a housing 10, an electric motor 20, a handle 30, a tool holder 40 with a tool 50 and a measuring device 60 for detecting the running time of the machine tool 1.
  • the electric motor 20 which is in the form of a DC motor, AC motor, universal motor or the like, is positioned in the housing 10.
  • the housing 10 of the machine tool 1 includes a first end 12, a second end 13, a top 14 and a bottom 15.
  • the handle 30 is positioned.
  • the handle 30 has a first (upper) end 32 and a second (lower) end 33.
  • the actuating switch 35 is designed in the form of a potentiometer (potentiometer) and connected via a connecting line 36 to the electric motor 20. Alternatively, however, any other suitable switch can be used.
  • the actuation switch 35 further includes a spring 37, which returns the operation switch 35 when not in operation back to the starting position. By actuating the operation switch 35, i.
  • the electric motor 20 is activated.
  • the operation switch 35 is no longer actuated, i. the operation switch 35 moves in the direction B due to the spring 37, the electric motor 20 is deactivated.
  • the electric motor 20 is controlled and finally the tool 50 in rotation (rotational direction C or D) is added.
  • an accumulator 65 is releasably secured again, ie the accumulator 65 can be connected to the handle 30 and removed again.
  • the accumulator 65 serves to supply power to the machine tool 1 or the electric motor 20.
  • the accumulator 65 may be a lithium-ion accumulator or the like.
  • the machine tool 1 can also be supplied with a mains power source (not shown) via a network cable (not shown). This mains power source can be a socket.
  • the tool holder 40 is positioned.
  • the tool holder 40 is configured to have a tool 50, such as a tool 50, e.g. a drill or screwdriver bit to receive and hold is connected via a drive shaft 55 to the electric motor 20. With the aid of the drive shaft 55, a torque generated in the electric motor 20 is transmitted to the tool holder 40 and finally to the tool 50.
  • the rotated tool 50 (rotational direction C or D) allows work to be done in the form of drilling or screwing.
  • the measuring device 60 for detecting the running time of the machine tool 1 includes a housing 10, a sensor 70 for detecting a magnetic field, a comparator circuit 80 and a counter 90.
  • the measuring device 60 is connected to the upper side 14 of the housing 10.
  • the sensor 70 is designed in the form of a magnetic field sensor or the like and arranged in the housing 10 of the measuring device 60 such that it is capable of detecting the magnetic field or magnetic stray field generated in the electric motor 20.
  • the comparator circuit 80 is likewise positioned in the housing 10 of the measuring device 60 and connected to the magnetic field sensor 70 via a connecting line 62.
  • the counter 90 includes an event counter 92 with a display (display) 94, with which the number of switch operations in the form of commissioning of the electric motor 20 of the machine tool 1 is displayed and readable for the user.
  • the counter 90 is connected to the comparator circuit 80 via a connection line 96.
  • the magnetic field sensor 70 For detecting the number of switch operations (and thus the use of the machine tool 1), the magnetic field sensor 70 detects the magnetic field (stray magnetic field) that arises in the electric motor 20 when it is activated (rotated). Due to the detection of a magnetic field generated in the electric motor 20, the magnetic field sensor 70 generates a signal in the form of a voltage value and transmits it to the comparator circuit 80.
  • the comparator circuit 80 compares the voltage value generated by the magnetic field sensor 70 with a reference value stored in the measuring device 60.
  • the reference value is realized in the form of a voltage value (in the sense of a voltage divider).
  • the event counter 92 of the counter 90 In the event that the voltage value generated by the magnetic field sensor 70 is greater than the stored reference voltage, the event counter 92 of the counter 90 is activated.
  • the The event counter 92 of the counter 90 detects the number of activations (ie, the activation phase) of the electric motor 20 and thus the number of uses of the machine tool 1.
  • the voltage value generated by the magnetic field sensor 70 is dependent on the presence of a (as described above) Magnetic field, which arises in each electric motor 20 during its activation. When the electric motor 20 is no longer activated (eg, by non-actuation of the switch or lack of energy in the power supply, such as an empty battery) no magnetic field is generated and consequently the magnetic field sensor 70 can no longer detect a magnetic field.
  • the voltage value is no longer generated by the magnetic field sensor 70 and the reference value is automatically greater than the generated voltage value.
  • the number of activations already recorded remains in the counter 90 and remains visible until the display of the display 94 is cleared by means of a separate (not shown) reset function (delete function).
  • this magnetic field is again detected by the magnetic field sensor 70.
  • the magnetic field sensor 70 then again generates a voltage value for the comparator circuit 80, which again compares this voltage value (as proof of a magnetic field) with the fixed reference voltage.
  • the event counter 92 of the counter 90 is restarted, and the reuse of the machine tool 1 is counted.
  • the actual time of use of a machine tool can be effectively measured, whereby the next maintenance or inspection of the machine tool must take place only when the actual maximum time of use is reached.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Control Of Electric Motors In General (AREA)
EP13197045.1A 2013-12-13 2013-12-13 Compteur d'événements avec capteur magnétique Withdrawn EP2884464A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13197045.1A EP2884464A1 (fr) 2013-12-13 2013-12-13 Compteur d'événements avec capteur magnétique
PCT/EP2014/076981 WO2015086563A1 (fr) 2013-12-13 2014-12-09 Compteur d'événements doté d'un capteur magnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13197045.1A EP2884464A1 (fr) 2013-12-13 2013-12-13 Compteur d'événements avec capteur magnétique

Publications (1)

Publication Number Publication Date
EP2884464A1 true EP2884464A1 (fr) 2015-06-17

Family

ID=49916818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13197045.1A Withdrawn EP2884464A1 (fr) 2013-12-13 2013-12-13 Compteur d'événements avec capteur magnétique

Country Status (2)

Country Link
EP (1) EP2884464A1 (fr)
WO (1) WO2015086563A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018138198A1 (fr) * 2017-01-28 2018-08-02 Lenze Drives Gmbh Unité d'entraînement électrique avec surveillance de besoin de maintenance intelligente
US10158301B2 (en) 2017-02-14 2018-12-18 Black & Decker Inc. Sensorless thermal protection for power tools

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120628218B (zh) * 2025-08-12 2025-11-14 广州巨时信息科技股份有限公司 一种基于振动和磁场双模检测的机械启停监测方法和装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029188A (en) * 1989-11-03 1991-07-02 Joyner Engineers And Trainers Apparatus for monitoring operation cycles of an electrically actuated device
WO2001005559A2 (fr) * 1999-07-16 2001-01-25 Gass Stephen F Outils electriques ameliores
WO2006033072A1 (fr) * 2004-09-23 2006-03-30 Koninklijke Philips Electronics N.V. Suivi du temps de fonctionnement d'un dispositif
US20090274263A1 (en) * 2008-05-05 2009-11-05 Collins Michael P Run-Time Meter With Blind Interface

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029188A (en) * 1989-11-03 1991-07-02 Joyner Engineers And Trainers Apparatus for monitoring operation cycles of an electrically actuated device
WO2001005559A2 (fr) * 1999-07-16 2001-01-25 Gass Stephen F Outils electriques ameliores
WO2006033072A1 (fr) * 2004-09-23 2006-03-30 Koninklijke Philips Electronics N.V. Suivi du temps de fonctionnement d'un dispositif
US20090274263A1 (en) * 2008-05-05 2009-11-05 Collins Michael P Run-Time Meter With Blind Interface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018138198A1 (fr) * 2017-01-28 2018-08-02 Lenze Drives Gmbh Unité d'entraînement électrique avec surveillance de besoin de maintenance intelligente
US11486793B2 (en) 2017-01-28 2022-11-01 Fras-Le S.A. Electric drive unit having intelligent maintenance requirement monitoring
US10158301B2 (en) 2017-02-14 2018-12-18 Black & Decker Inc. Sensorless thermal protection for power tools

Also Published As

Publication number Publication date
WO2015086563A1 (fr) 2015-06-18

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