EP1452278A1 - Control method of a percussion power drill - Google Patents

Control method of a percussion power drill Download PDF

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Publication number
EP1452278A1
EP1452278A1 EP04100792A EP04100792A EP1452278A1 EP 1452278 A1 EP1452278 A1 EP 1452278A1 EP 04100792 A EP04100792 A EP 04100792A EP 04100792 A EP04100792 A EP 04100792A EP 1452278 A1 EP1452278 A1 EP 1452278A1
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EP
European Patent Office
Prior art keywords
control method
computing means
clutch
tool
sensor
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.)
Granted
Application number
EP04100792A
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German (de)
French (fr)
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EP1452278B1 (en
Inventor
Hans Böni
Roland Schaer
Harald Schmitzer
Ricardo Teixeira
Christoph Würsch
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
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Hilti AG
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1452278A1 publication Critical patent/EP1452278A1/en
Application granted granted Critical
Publication of EP1452278B1 publication Critical patent/EP1452278B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/141—Magnetic parts used in percussive tools
    • B25D2250/145—Electro-magnetic parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/195—Regulation means
    • B25D2250/205—Regulation means for torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the invention relates to a control method of an at least partially axially striking and rotating electric hand machine tool like a combi hammer or one Chisel.
  • DE3707052 has an axially striking and rotating Electric hand machine tool in the power flow between an electric motor and one Tool holder on an electromagnetic safety coupling, which with a Microcontroller is controllably connected, which is connected to sensors and their Control procedure for a tool blockage separates the flow of force.
  • an electric impact wrench has a weak one Electric motor, a gearbox and an electromagnetic one behind it Coupling on, which triggers tangential shocks by this when freely running or the electric motor braked by the workpiece is switched on and off depending on the speed.
  • the task is to realize an at least partially axially striking and rotating electric hand machine tool with a control method for generating Tangentialangen.
  • a control method for an axially striking and rotating Electric hand machine tool in which the power flow between an electric motor and a tool holder an electromagnetic clutch is arranged, which with a computer is controllably connected, which is connected to sensors, in the safety coupling at least one process step controlled by the computing means repeatedly opened and closed alternately.
  • the coupling with a frequency in the range of is advantageous 20 Hz to 100 Hz alternately opened and closed, whereby the frequency of the Tangential beats much greater than the natural frequency of those in the hand-arm system guided electric hand machine tool.
  • This method step is advantageous in the case of one from the computing means via the sensor detected, further advantageous with respect to a rotation of the housing or the slip the clutch, impending tool blockage initiated, which at least in some cases the tool blockage can be averted by the tangential strikes.
  • the sensor is advantageous as a metal detector, for example as a leakage current detector, as a capacitive one or inductive proximity switch, etc. formed, whereby in particular Impact drilling in concrete on reinforcement iron hits via the initiated tangential impacts Probability of a tool blockage can be reduced.
  • the computing means with a manually operated switch is advantageous Pushbuttons, via which this process step can be initiated manually, thereby these tangential beats can be preselected manually.
  • Electric hand machine tools are capable of such a control method expandable so that the probability of a tool blockage can be actively reduced.
  • computing means advantageously in the form of a microcontroller, are used appropriate software algorithms implemented.
  • the 1 has an axially striking and rotating electric hand machine tool 1 in Shape of a hammer drill in the power flow between an electric motor 2 and one Tool holder 3 an electromagnetic designed as a safety clutch Coupling 4, which is equipped with a computing means 5 designed as a microcontroller is controllably connected, which is connected to sensors 6a, 6b, 6c.
  • the sensor 6a is a arranged in the housing 7 of the electric hand machine tool 1 Acceleration sensor.
  • the sensor 6b is arranged in the clutch 4 Slip sensor.
  • the sensor 6c is arranged in the tool holder 3 Kriechstromsensor.
  • a manually operable switch 8 is on the outside of the housing 7 arranged and controllably connected to the computing means 5.
  • the clutch 4 is repeatedly opened and closed alternately in a method step initiated by the computing means 5 at time t 0 , the period in which the electromagnetic clutch 4 is alternately opened and closed being 20 ms, which is a frequency of 50 Hz corresponds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The control method uses a microcontroller (5) for controlling an electromagnetic clutch (4) between an electric motor (2) and a tool chuck (3), supplied with signals from one or more sensors (6a,6b,6c). The microcontroller allows repetitive opening and closing of the clutch at a frequency of between 20 Hz and 100 Hz in a given operating mode, initiated by detection of a tool blockage or upon operation of a manual switch (8).

Description

Die Erfindung bezeichnet ein Steuerverfahren einer zumindest teilweise axial schlagenden und drehenden Elektrohandwerkzeugmaschine wie einen Kombihammer oder einen Meisselhammer.The invention relates to a control method of an at least partially axially striking and rotating electric hand machine tool like a combi hammer or one Chisel.

Nach der DE3707052 weist eine axial schlagende und drehende Elektrohandwerkzeugmaschine im Kraftfluss zwischen einem Elektromotor und einer Werkzeugaufnahme eine elektromagnetische Sicherheitskupplung auf, welche mit einem Mikrocontroller steuerbar verbunden ist, der mit Sensoren verbunden ist und deren Steuerverfahren bei einer Werkzeugblockade den Kraftfluss auftrennt.According to DE3707052 has an axially striking and rotating Electric hand machine tool in the power flow between an electric motor and one Tool holder on an electromagnetic safety coupling, which with a Microcontroller is controllably connected, which is connected to sensors and their Control procedure for a tool blockage separates the flow of force.

Zudem weist nach der US5076120 ein Elektroschlagschrauber einen schwachen Elektromotor, ein Getriebe und im Kraftfluss hinter diesem eine elektromagnetische Kupplung auf, welche Tangentialschläge auslöst, indem diese beim frei hochlaufenden bzw. vom Werkstück abgebremsten Elektromotor drehzahlabhängig ein- und ausgeschaltet wird.In addition, according to US5076120, an electric impact wrench has a weak one Electric motor, a gearbox and an electromagnetic one behind it Coupling on, which triggers tangential shocks by this when freely running or the electric motor braked by the workpiece is switched on and off depending on the speed.

Die Aufgabe besteht in der Realisierung einer zumindest teilweise axial schlagenden und drehenden Elektrohandwerkzeugmaschine mit einem Steuerverfahren zur Erzeugung von Tangentialschlägen.The task is to realize an at least partially axially striking and rotating electric hand machine tool with a control method for generating Tangentialschlägen.

Die Aufgabe wird im Wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result from the subclaims.

Im Wesentlichen wird bei einem Steuerverfahren für eine axial schlagende und drehende Elektrohandwerkzeugmaschine, bei welcher im Kraftfluss zwischen einem Elektromotor und einer Werkzeugaufnahme eine elektromagnetische Kupplung angeordnet ist, welche mit einem Rechenmittel steuerbar verbunden ist, welches mit Sensoren verbunden ist, in zumindest einem vom Rechenmittel gesteuerten Verfahrensschritt die Sicherheitskupplung wiederholt alternierend geöffnet und geschlossen.In essence, a control method for an axially striking and rotating Electric hand machine tool, in which the power flow between an electric motor and a tool holder an electromagnetic clutch is arranged, which with a computer is controllably connected, which is connected to sensors, in the safety coupling at least one process step controlled by the computing means repeatedly opened and closed alternately.

Durch die wiederholt alternierend geöffnete und geschlossene Sicherheitskupplung werden durch das Massenträgheitsmoment des Elektromotors energetisch gespeiste Tangentialschläge gegen den Bearbeitungswiderstand eines mit der Werkzeugaufnahme verbundenen Werkzeuges erzeugt.Due to the repeated alternating opening and closing of the safety clutch energetically fed by the moment of inertia of the electric motor Tangential impacts against the machining resistance of one with the tool holder connected tool generated.

Vorteilhaft wird in diesem Verfahrensschritt die Kupplung mit einer Frequenz im Bereich von 20 Hz bis 100 Hz alternierend geöffnet und geschlossen, wodurch die Frequenz der Tangentialschläge wesentlich grösser als die Eigenfrequenz der im Hand-Arm-System geführten Elektrohandwerkzeugmaschine ist.In this method step, the coupling with a frequency in the range of is advantageous 20 Hz to 100 Hz alternately opened and closed, whereby the frequency of the Tangential beats much greater than the natural frequency of those in the hand-arm system guided electric hand machine tool.

Vorteilhaft wird dieser Verfahrensschritt bei einer vom Rechenmittel über den Sensor detektierten, weiter vorteilhaft bezüglich einer Verdrehung des Gehäuses oder den Schlupf der Kupplung, drohenden Werkzeugblockade initiiert, wodurch zumindest in einigen Fällen durch die Tangentialschläge die Werkzeugblockade abgewendet werden kann.This method step is advantageous in the case of one from the computing means via the sensor detected, further advantageous with respect to a rotation of the housing or the slip the clutch, impending tool blockage initiated, which at least in some cases the tool blockage can be averted by the tangential strikes.

Vorteilhaft ist der Sensor als Metalldetektor bspw. als Kriechstromdetektor, als kapazitiver oder induktiver Näherungsschalter usw. ausgebildet, wodurch insbesondere beim Schlagbohren in Beton bei Armierungseisentreffern über die initiierten Tangentialschläge die Wahrscheinlichkeit einer Werkzeugblockade verminderbar ist.The sensor is advantageous as a metal detector, for example as a leakage current detector, as a capacitive one or inductive proximity switch, etc. formed, whereby in particular Impact drilling in concrete on reinforcement iron hits via the initiated tangential impacts Probability of a tool blockage can be reduced.

Vorteilhaft ist das Rechenmittel mit einem manuell betätigbaren Schalter, bspw. einen Taster, verbunden, über welchen dieser Verfahrensschritt manuell initiierbar ist, wodurch diese Tangentialschläge manuell vorwählbar sind.The computing means with a manually operated switch, for example one, is advantageous Pushbuttons, via which this process step can be initiated manually, thereby these tangential beats can be preselected manually.

Im Wesentlichen ist eine zumindest teilweise axial schlagende und drehende Elektrohandwerkzeugmaschine, bei welcher im Kraftfluss zwischen einem Elektromotor und einer Werkzeugaufnahme eine elektromagnetische Kupplung angeordnet ist, welche mit einem, mit Sensoren verbundenen, Rechenmittel steuerbar verbunden ist, nach einem derartigen Steuerverfahren vom Rechenmittel steuerbar.Essentially, it is at least partially axially striking and rotating Electric hand machine tool, in which the power flow between an electric motor and a tool holder an electromagnetic clutch is arranged, which with is connected to a computing means connected to sensors in a controllable manner, according to a such control methods can be controlled by the computing means.

Bereits mit einer elektromagnetischen Kupplung, vorteilhaft in Form einer Sicherheitskupplung ausgebildeten, vor Werkzeugblockaden geschützte Elektrohandwerkzeugmaschinen sind mit einem derartigen Steuerverfahren dahingehend erweiterbar, dass die Wahrscheinlichkeit einer Werkzeugblockade aktiv verminderbar ist. Dazu sind im, vorteilhaft in Form eines Mikrocontrollers ausgebildeten, Rechenmittel entsprechende Softwarealgorithmen implementiert.Already with an electromagnetic clutch, advantageously in the form of a Safety coupling trained, protected from tool blockages Electric hand machine tools are capable of such a control method expandable so that the probability of a tool blockage can be actively reduced. For this purpose, computing means, advantageously in the form of a microcontroller, are used appropriate software algorithms implemented.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als Elektrohandwerkzeugmaschine
  • Fig. 2 als Steuerverfahren
    • The invention is explained in more detail with respect to an advantageous exemplary embodiment with:
  • Fig. 1 as an electric hand machine tool
  • Fig. 2 as a control method

    • Nach Fig. 1 weist eine axial schlagende und drehende Elektrohandwerkzeugmaschine 1 in Form eines Bohrhammers im Kraftfluss zwischen einem Elektromotor 2 und einer Werkzeugaufnahme 3 eine als Sicherheitskupplung ausgebildete elektromagnetische Kupplung 4 auf, welche mit einem als Mikrocontroller ausgebildeten Rechenmittel 5 steuerbar verbunden ist, welches mit Sensoren 6a, 6b, 6c verbunden ist. Der Sensor 6a ist ein im Gehäuse 7 der Elektrohandwerkzeugmaschine 1 angeordneter Beschleunigungssensor. Der Sensor 6b ist ein in der Kupplung 4 angeordneter Schlupfsensor. Der Sensor 6c ist ein in der Werkzeugaufnahme 3 angeordneter Kriechstromsensor. Ein manuell betätigbarer Schalter 8 ist aussen am Gehäuse 7 angeordnet und mit dem Rechenmittel 5 steuerbar verbunden.1 has an axially striking and rotating electric hand machine tool 1 in Shape of a hammer drill in the power flow between an electric motor 2 and one Tool holder 3 an electromagnetic designed as a safety clutch Coupling 4, which is equipped with a computing means 5 designed as a microcontroller is controllably connected, which is connected to sensors 6a, 6b, 6c. The sensor 6a is a arranged in the housing 7 of the electric hand machine tool 1 Acceleration sensor. The sensor 6b is arranged in the clutch 4 Slip sensor. The sensor 6c is arranged in the tool holder 3 Kriechstromsensor. A manually operable switch 8 is on the outside of the housing 7 arranged and controllably connected to the computing means 5.

    Nach Fig. 2 wird bei einem vom Rechenmittel 5 zum Zeitpunkt t0 initiierten Verfahrensschritt die Kupplung 4 wiederholt alternierend geöffnet und geschlossen, wobei die Periodendauer, in welcher die elektromagnetische Kupplung 4 alternierend geöffnet und geschlossen wird, 20 ms beträgt, was einer Frequenz von 50 Hz entspricht.2, the clutch 4 is repeatedly opened and closed alternately in a method step initiated by the computing means 5 at time t 0 , the period in which the electromagnetic clutch 4 is alternately opened and closed being 20 ms, which is a frequency of 50 Hz corresponds.

    Claims (5)

    Steuerverfahren für eine zumindest teilweise axial schlagende und drehende Elektrohandwerkzeugmaschine (1), bei welcher im Kraftfluss zwischen einem Elektromotor (2) und einer Werkzeugaufnahme (3) eine elektromagnetische Kupplung (4) angeordnet ist, welche mit einem Rechenmittel (5) steuerbar verbunden ist, welches mit zumindest einem Sensor (6a, 6b, 6c) verbunden ist, dadurch gekennzeichnet, dass in zumindest einem vom Rechenmittel (5) gesteuerten Verfahre nsschritt die Kupplung (4) wiederholt alternierend geöffnet und geschlossen wird.Control method for an at least partially axially striking and rotating electric hand machine tool (1), in which an electromagnetic clutch (4) is arranged in the power flow between an electric motor (2) and a tool holder (3) and is controllably connected to a computing means (5), which is connected to at least one sensor (6a, 6b, 6c), characterized in that in at least one process step controlled by the computing means (5) the clutch (4) is repeatedly opened and closed alternately. Steuerverfahren nach Anspruch 1, dadurch gekennzeichnet, dass in diesem Verfahrensschritt die Kupplung (4) mit einer Frequenz im Bereich von 20 Hz bis 100 Hz alternierend geöffnet und geschlossen wird.Control method according to Claim 1, characterized in that in this method step the clutch (4) is alternately opened and closed with a frequency in the range from 20 Hz to 100 Hz. Steuerverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass dieser Verfahrensschritt bei einer vom Rechenmittel (5) über den Sensor (6a, 6b, 6c) detektierten drohenden Werkzeugblockade initiiert wird, optional bezüglich einer Verdrehung eines Gehäuses (7) der Elektrohandwerkzeugmaschine (1), bezüglich des Schlupfes der Kupplung (4) oder bezüglich der Detektion von Metall.Control method according to Claim 1 or 2, characterized in that this method step is initiated in the event of an impending tool blockage detected by the computing means (5) via the sensor (6a, 6b, 6c), optionally with respect to a rotation of a housing (7) of the electric hand machine tool (1) , regarding the slippage of the clutch (4) or regarding the detection of metal. Steuerverfahren nach Anspruch 1, dadurch gekennzeichnet, dass dieser Verfahrensschritt manuell über einen mit dem Rechenmittel (5) verbunden, manuell betätigbaren Schalter (8) initiierbar ist.Control method according to Claim 1, characterized in that this method step can be initiated manually via a switch (8) which can be actuated manually and is connected to the computing means (5). Elektrohandwerkzeugmaschine mit zumindest teilweise axial schlagenden und drehenden Antrieb einer Werkzeugaufnahme (3), bei welcher im Kraftfluss zwischen einem Elektromotor (2) und der Werkzeugaufnahme (3) eine elektromagnetische Kupplung (4) angeordnet ist, welche mit einem, mit zumindest einem Sensor (6a, 6b, 6c) verbundenen, Rechenmittel (5) steuerbar verbunden ist, dadurch gekennzeichnet, dass die elektromagnetische Kupplung (4) nach einem Steuerverfahren nach einem der vorherigen Ansprüche vom Rechenmittel (5) steuerbar ist.Electric hand machine tool with at least partially axially striking and rotating drive of a tool holder (3), in which an electromagnetic clutch (4) is arranged in the power flow between an electric motor (2) and the tool holder (3), which is coupled with a sensor with at least one sensor (6a , 6b, 6c), the computing means (5) is controllably connected, characterized in that the electromagnetic clutch (4) can be controlled by the computing means (5) according to a control method according to one of the preceding claims.
    EP04100792A 2003-03-01 2004-03-01 Control method of a percussion power drill Expired - Lifetime EP1452278B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10309012 2003-03-01
    DE10309012A DE10309012B3 (en) 2003-03-01 2003-03-01 Control method for hand-held electric hammer drill using microcontroller for repetitive opening and closing of clutch between electric motor and tool chuck

    Publications (2)

    Publication Number Publication Date
    EP1452278A1 true EP1452278A1 (en) 2004-09-01
    EP1452278B1 EP1452278B1 (en) 2011-05-11

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    US (1) US6981557B2 (en)
    EP (1) EP1452278B1 (en)
    JP (1) JP4580663B2 (en)
    DE (1) DE10309012B3 (en)

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    Also Published As

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    DE10309012B3 (en) 2004-08-12
    JP4580663B2 (en) 2010-11-17
    EP1452278B1 (en) 2011-05-11
    US6981557B2 (en) 2006-01-03
    JP2004261957A (en) 2004-09-24
    US20040226728A1 (en) 2004-11-18

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