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EP2495076A1 - Method for setting a split anchor and screwdriver for setting a split anchor - Google Patents

Method for setting a split anchor and screwdriver for setting a split anchor Download PDF

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Publication number
EP2495076A1
EP2495076A1 EP12151662A EP12151662A EP2495076A1 EP 2495076 A1 EP2495076 A1 EP 2495076A1 EP 12151662 A EP12151662 A EP 12151662A EP 12151662 A EP12151662 A EP 12151662A EP 2495076 A1 EP2495076 A1 EP 2495076A1
Authority
EP
European Patent Office
Prior art keywords
expansion anchor
impact wrench
setting
expansion
rotary
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
EP12151662A
Other languages
German (de)
French (fr)
Other versions
EP2495076B1 (en
Inventor
Peer Schmidt
Joerg Appl
Serhey Khandozhko
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
Publication of EP2495076A1 publication Critical patent/EP2495076A1/en
Application granted granted Critical
Publication of EP2495076B1 publication Critical patent/EP2495076B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B31/00—Hand tools for applying fasteners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • the present invention relates to a setting method for an expansion anchor and an impact wrench for setting an expansion anchor, preferably with the aforementioned setting method.
  • Expansion anchors are inserted into a pre-drilled hole and then tightened their drawbar by default using a torque wrench.
  • the use of a torque wrench proves to be necessary because a user can not look at the expansion anchor inserted into the hole, whether it is properly braced, i. is set.
  • a torque wrench proves to be necessary because a user can not look at the expansion anchor inserted into the hole, whether it is properly braced, i. is set.
  • the manufacturers of the expansion anchor accordingly indicate an associated tightening torque which is to be set on the torque wrench for setting.
  • the setting method according to the invention for an expansion anchor provides the following steps. On a pull rod of the expansion anchor repetitive rotary blows are exerted by means of a wrench, wherein a repetition rate of the rotary latches is set in response to a predetermined for spreading an expansion sleeve of the expansion anchor tightening torque.
  • the impact wrench sets the application of rotational shocks when a detected average speed of the pull rod falls below a threshold value.
  • the impact wrench according to the invention for setting an expansion anchor has a read-in device for inputting a type of the expansion anchor or a tightening torque for the expansion anchor.
  • An impact mechanism of the impact wrench is used to generate repetitive turns.
  • a control device sets a repetition rate of the rotary lobe as a function of the type of expansion anchor or the entered tightening torque.
  • a sensor serves to detect a rotational speed of the drawbar, in response to a shutdown device, the impact mechanism deactivates when the detected speed falls below a threshold.
  • Fig. 1 shows an exemplary expansion anchor 1 from a pull rod 2 and an expansion sleeve.
  • the expansion sleeve 3 circumferentially surrounds a cylindrical portion 4 of the pull rod second
  • An outer diameter 5 of the cylindrical portion 4 is preferably slightly smaller than an inner diameter 6 of the expansion sleeve 3 , whereby the pull rod 2 against the Aufspreizelement 3 is axially movable.
  • the cylindrical section 4 merges into a conical section 7 , which forms an expansion body 8 for spreading the expansion sleeve 3 .
  • the largest diameter of the conical section 7 is greater than the inner diameter 6 of the expansion sleeve 3 and preferably less than an outer diameter 9 of the expansion sleeve.
  • a thread 10 is provided, via which a tensile force can be introduced.
  • the thread 10 serves at the same time a fastening of loads.
  • the expansion anchor 1 with the expansion body 8 is inserted into a borehole having a diameter equal to the outer diameter of the unexpanded expansion sleeve 3 .
  • a nut 11 is screwed onto the thread 10 and tightened until the pull rod 2 together with the spreader 8 is pulled into the expansion sleeve 3 .
  • the expansion sleeve 3 clamps firmly to a wall 12 of the borehole.
  • the expansion anchor 1 is set properly when the Expansion sleeve 3 is radially expanded by a certain amount. A user can recognize this when the pull rod 2 stops rotating at a specified tightening torque.
  • expansion anchors for example, a bolt with a mating thread that engages the thread 10 of the drawbar 2 .
  • the user uses a screwing tool on the bolt and pulls in this way the pull rod 2 with the spreader 8 in the expansion sleeve.
  • the exemplary expansion anchors 1 can be set by means of an adapted impact wrench 20 .
  • the impact wrench 20 has a percussion mechanism 21 which periodically generates rotary impacts.
  • a hammer 22 is mounted on a drive shaft 23 by means of a helical link 24 .
  • a spring 25 presses the hammer 22 along the output shaft 23 in the direction of an anvil 26th
  • the anvil 26 is rigidly connected to an output shaft 27 .
  • the drive shaft 23 and the output shaft 27 are rotatable relative to each other.
  • the hammer 22 and the anvil 26 have projecting jaws 28 along the drive shaft 23 , via which the hammer 22 can transmit torque to the anvil 26 .
  • An electric motor 29 drives the drive shaft 23 .
  • One cycle of a rotary stroke has essentially the following phases.
  • the claws 28 of the hammer 22 abut the anvil 26 .
  • the rotating drive shaft 23 pulls the hammer 22 away from the anvil 26 against the force of the spring 25 because of the link 24 until the dogs 28 are disengaged from the anvil 26 .
  • the hammer 22 moves in the direction of the anvil 26 and is thereby set by the link 24 in a rotational movement.
  • the jaws 28 eventually strike tangentially against the anvil 26 .
  • An embodiment of the impact wrench 20 has an input device 30 , by means of which a user can input a tightening torque of the expansion anchor 1 .
  • the input device 30 includes, for example, a button 31 or a keyboard and a display element 32 .
  • an input device may be provided, via which the user can set a type for an expansion anchor. For example, two buttons for selecting a type of expansion anchor and a size of the expansion anchor are provided. The selected type can be displayed, for example, in a display or via several LEDs.
  • the impact wrench has a detection device 33 , which determines the type of the expansion anchor 1 (101).
  • the recognition device 33 includes, for example, a reading unit 34 for an RFID chip.
  • the recognized type can be the Input device 30 are transmitted, among other things so that the recognized type is displayed to the user.
  • the recognition device 33 may also include a camera, which determines the type of expansion anchor on the basis of shape and size.
  • a controller 35 reads in the input tightening torque from the input device 30 and the recognizer 33, respectively ( 100 ).
  • the control device 35 determines based on the input tightening torque a speed N_soll for the drive shaft 23 ( 101 ). For example, rotational speeds assigned to different tightening torques are stored in a memory device 36 .
  • the control device 35 checks whether a rotational speed N has previously been predetermined ( 102 ), that is, for example, by specifying the type of armature or the tightening torque.
  • the control device 35 may inhibit activation of the motor 29, for example, if no tightening torque was selected so far, but instead prompt the user for an input ( 103 ).
  • the control device 35 controls the electric motor 29 such that the drive shaft 23 rotates at the predetermined speed N ( 104 ).
  • the rotational speed of the drive shaft 23 specifies the repetition rate of the rotational shocks. It was recognized that with a lowering of the speed not only frequency of the rotational shocks decreases, which is so far irrelevant for the setting of the expansion anchor, but also the torque exerted with each rotational shock is lowered. Each of the speeds is assigned, although with a large tolerance, a torque.
  • the impact wrench 38 begins to turn the pull rod 2 with a maximum possible speed to him. After a period of time, which is preferably determined by the input type of the expansion anchor 1 , the impact wrench lowers the rotational speed to the rotational speed predetermined in dependence on the tightening torque.
  • the speed sensor 39 includes, for example, a plurality of axial ribs 40 which are arranged along the circumference of the output shaft 27 at constant first angular intervals.
  • Two magnetic field sensors 41 eg Hall sensors, are arranged offset to one another at a second angular distance.
  • the second angular distance modulo the first angular distance is in the range between 20% and 33% of the first angular distance.
  • the speed sensor 39 detects not only the rotational speed but also the direction of rotation of the output shaft 27 . After a rotational shock output shaft 27 can move against the predetermined direction of rotation.
  • the rotational speed sensor 39 determines, based on the direction of rotation, the effective rotational speed d of the output shaft 27 in the predetermined direction of rotation ( 105 ), for example by means of an integrator.
  • the rotational speed d of the output shaft 27 is substantially identical to the rotational speed of the drawbar 2 and thus serves as a measure of the progress of the rotation of the pull rod or its axial displacement relative to the expansion sleeve. 3
  • the impact wrench 20 compares a detected rotational speed d of the output shaft 27 with a predetermined threshold value D for the rotational speed ( 106 ). If the average speed d falls below the threshold value D, the control device 35 switches off the motor 29 ( 109 ). The output shaft 27z now moves on average by a very small angle or not at all.
  • the threshold value D can be fixed, for example, by the impact wrench 20 .
  • the impact wrench 20 can stop the rotation when a maximum time T for setting a setting anchor 1 has elapsed after the operation of the button 37 (FIG. 107 ).
  • the control device 35 can detect the time t since the actuation of the pushbutton 37 . This can be traceable to a malfunction of the expansion anchor 1 , for example, the expansion sleeve 3 rotates in the borehole. The impact wrench 20 detects this as a misconduct and outputs a corresponding warning signal.
  • the impact wrench 20 may have a recording device 42 which records a protocol for each set expansion anchor 1 ( 108 ).
  • the recording device 42 includes, for example, a memory device and a communication interface for outputting the content of the memory device.
  • the expansion anchors 1 are provided with a unique identifier, such as a number of an RFID chip.
  • the detection device 33 determines before setting an expansion anchor 1 whose unique identifier. If an automatic identifier is not successful or not provided, the identifier can be entered manually. During setting, for example, the number of swings or the duration of the setting process can be recorded. Additionally or alternatively, it can be recorded how the rotational speed of the output shaft 27 changes, in particular the rotational speed at the time of the shutdown of the impact wrench. In this case, the speed is also recorded when the user stops setting the expansion anchor by releasing the button 37 .
  • the data logged by the recording device 42 can be read out via a wireless or wired interface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The method involves adjusting a repetition rate (Nsoll) of rotary percussions depending on starting torques predetermined for expansion of an expansion sleeve of an expansion anchor. Exertions of the rotary percussions on a draw bar of the expansion anchor are adjusted (107) by an impact screwdriver when detected center speed of the draw bar exceeds a threshold value. A repetition rate is adjusted responding to an input of a type of the expansion anchor or starting torques by the screwdriver. Duration for setting the expansion anchor is detected by the screwdriver. The impact screwdriver has a reading unit for a radio frequency identification chip. The type of the expansion anchor is indicated by LEDs. An independent claim is also included for an impact screwdriver for setting an expansion anchor.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft ein Setzverfahren für einen Spreizanker und einen Schlagschrauber zum Setzen eines Spreizanker, vorzugsweise mit dem vorgenannten Setzverfahren.The present invention relates to a setting method for an expansion anchor and an impact wrench for setting an expansion anchor, preferably with the aforementioned setting method.

Spreizanker werden in ein vorgebohrtes Loch eingesetzt und dann deren Zugstange standardmäßig mittels eines Drehmomentschlüssels angezogen. Die Verwendung eines Drehmomentschlüssels erweist sich als notwendig, da ein Anwender bei dem in das Loch eingesetzten Spreizankers nicht ansehen kann, ob dieser ordnungsgemäß verspreizt, d.h. gesetzt ist. Hierbei treten sowohl Probleme bei einer zu geringen Verspreizung und somit geringeren Belastbarkeit der Verankerung im Untergrund und einer zu starken Verspreizung, wegen einer möglichen Ermüdung des Spreizanker auf. Die Hersteller der Spreizanker geben entsprechend ein zugehöriges Anzugsdrehmoment an, welches an dem Drehmomentschlüssel zum Setzen eingestellt werden soll.Expansion anchors are inserted into a pre-drilled hole and then tightened their drawbar by default using a torque wrench. The use of a torque wrench proves to be necessary because a user can not look at the expansion anchor inserted into the hole, whether it is properly braced, i. is set. Here are both problems with too low spreading and thus lower resilience of the anchorage in the ground and too strong spreading, because of a possible fatigue of the expansion anchor on. The manufacturers of the expansion anchor accordingly indicate an associated tightening torque which is to be set on the torque wrench for setting.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Das erfindungsgemäße Setzverfahren für einen Spreizanker sieht folgende Schritte vor. Auf eine Zugstange des Spreizankers werden mittels eines Schlagschraubers repetitiv Drehschlage ausgeübt, wobei eine Wiederholungsrate der Drehschlage in Abhängigkeit eines zum Verspreizen einer Spreizhülse des Spreizankers vorgegebenen Anzugsdrehmoments eingestellt wird. Der Schlagschrauber stellt das Ausüben von Drehschlägen ein, wenn eine erfasste mittlere Drehzahl der Zugstange einen Schwellwert unterschreitet.The setting method according to the invention for an expansion anchor provides the following steps. On a pull rod of the expansion anchor repetitive rotary blows are exerted by means of a wrench, wherein a repetition rate of the rotary latches is set in response to a predetermined for spreading an expansion sleeve of the expansion anchor tightening torque. The impact wrench sets the application of rotational shocks when a detected average speed of the pull rod falls below a threshold value.

Der erfindungsgemäße Schlagschrauber zum Setzen eines Spreizankers hat eine Einleseeinrichtung zum Eingeben eines Typs des Spreizankers oder eines Anzugsdrehmoment für den Spreizanker. Ein Schlagwerk des Schlagschrauber dient einem Erzeugen von repetitiven Drehschlägen. Eine Steuerungseinrichtung stellt eine Wiederholungsrate der Drehschlage in Abhängigkeit des Typs des Spreizankers oder des eingegebenen Anzugsdrehmoments ein. Ein Sensor dient einem Erfassen einer Drehzahl der Zugstange, auf die ansprechend eine Abschalteinrichtung, das Schlagwerk deaktiviert, wenn die erfasste Drehzahl einen Schwellwert unterschreitet.The impact wrench according to the invention for setting an expansion anchor has a read-in device for inputting a type of the expansion anchor or a tightening torque for the expansion anchor. An impact mechanism of the impact wrench is used to generate repetitive turns. A control device sets a repetition rate of the rotary lobe as a function of the type of expansion anchor or the entered tightening torque. A sensor serves to detect a rotational speed of the drawbar, in response to a shutdown device, the impact mechanism deactivates when the detected speed falls below a threshold.

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
ein Spreizanker;
Fig. 2
einen Schlagschrauber
Fig. 3
ein Steuerungsablauf des Schlagschraubers
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
Fig. 1
an expansion anchor;
Fig. 2
an impact wrench
Fig. 3
a control sequence of impact wrench

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben.Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt einen beispielhaften Spreizanker 1 aus einer Zugstange 2 und einer Spreizhülse 3. Die Spreizhülse 3 umgibt umfänglich einen zylindrischen Abschnitt 4 der Zugstange 2. Ein Außendurchmesser 5 des zylindrischen Abschnitts 4 ist vorzugsweise etwas geringer als ein Innendurchmesser 6 der Spreizhülse 3, wodurch die Zugstange 2 gegenüber dem Aufspreizelement 3 axial beweglich ist. Der zylindrische Abschnitt 4 geht in einen konischen Abschnitt 7 über, welcher einen Spreizkörper 8 zum Aufspreizen der Spreizhülse 3 bildet. Der größte Durchmesser des konischen Abschnitts 7 ist größer als der Innendurchmesser 6 der Spreizhülse 3 und vorzugsweise geringer als ein Außendurchmesser 9 der Spreizhülse 3. An der Zugstange 2 ist ein Gewinde 10 vorgesehen, über welches eine Zugkraft eingeleitet werden kann. Bei dem beispielhaften Spreizanker 1 dient das Gewinde 10 zugleich einer Befestigung von Lasten. Bei einer Montage wird der Spreizanker 1 mit dem Spreizkörper 8 voraus in ein Bohrloch mit einem Durchmesser gleich dem Außendurchmesser der unverspreizten Spreizhülse 3 eingesetzt. Eine Mutter 11 wird auf das Gewinde 10 aufgeschraubt und festgezogen, solange bis die Zugstange 2 samt dem Spreizkörper 8 in die Spreizhülse 3 gezogen wird. Die Spreizhülse 3 klemmt sich dabei an einer Wand 12 des Bohrlochs fest. Der Spreizanker 1 ist ordnungsgemäß gesetzt, wenn die Spreizhülse 3 um ein bestimmtes Maß radial erweitert ist. Ein Anwender kann dies erkennen, wenn die Zugstange 2 bei einem spezifizierten Anzugsdrehmoment sich nicht mehr dreht. Fig. 1 shows an exemplary expansion anchor 1 from a pull rod 2 and an expansion sleeve. 3 The expansion sleeve 3 circumferentially surrounds a cylindrical portion 4 of the pull rod second An outer diameter 5 of the cylindrical portion 4 is preferably slightly smaller than an inner diameter 6 of the expansion sleeve 3 , whereby the pull rod 2 against the Aufspreizelement 3 is axially movable. The cylindrical section 4 merges into a conical section 7 , which forms an expansion body 8 for spreading the expansion sleeve 3 . The largest diameter of the conical section 7 is greater than the inner diameter 6 of the expansion sleeve 3 and preferably less than an outer diameter 9 of the expansion sleeve. 3 On the pull rod 2 , a thread 10 is provided, via which a tensile force can be introduced. In the exemplary expansion anchor 1 , the thread 10 serves at the same time a fastening of loads. During assembly, the expansion anchor 1 with the expansion body 8 is inserted into a borehole having a diameter equal to the outer diameter of the unexpanded expansion sleeve 3 . A nut 11 is screwed onto the thread 10 and tightened until the pull rod 2 together with the spreader 8 is pulled into the expansion sleeve 3 . The expansion sleeve 3 clamps firmly to a wall 12 of the borehole. The expansion anchor 1 is set properly when the Expansion sleeve 3 is radially expanded by a certain amount. A user can recognize this when the pull rod 2 stops rotating at a specified tightening torque.

Andere Spreizanker können beispielsweise einen Bolzen mit einem Gegengewinde, das an das Gewinde 10 der Zugstange 2 angreift. Bei der Montage setzt der Anwender ein Schraubwerkzeug an dem Bolzen an und zieht auf diese Weise die Zugstange 2 mit dem Spreizkörper 8 in die Spreizhülse 3.Other expansion anchors, for example, a bolt with a mating thread that engages the thread 10 of the drawbar 2 . During assembly, the user uses a screwing tool on the bolt and pulls in this way the pull rod 2 with the spreader 8 in the expansion sleeve. 3

Die beispielhaften Spreizanker 1 können mittels eines adaptierten Schlagschraubers 20 gesetzt werden. Der Schlagschrauber 20 hat einen Schlagwerk 21, welcher periodisch Drehschläge erzeugt. Ein Hammer 22 ist auf einer Antriebswelle 23 mittels einer spiralförmigen Kulisse 24 gelagert. Eine Feder 25 drückt den Hammer 22 längs der Abtriebswelle 23 in Richtung zu einem Amboss 26. Der Amboss 26 ist mit einer Abtriebswelle 27 starr verbunden. Die Antriebswelle 23 und die Abtriebswelle 27 sind relativ zueinander verdrehbar. Der Hammer 22 und der Amboss 26 haben längs der Antriebswelle 23 vorspringende Klauen 28, über welche der Hammer 22 ein Drehmoment auf den Amboss 26 übertragen kann. Ein Elektromotor 29 treibt die Antriebswelle 23 an. Ein Zyklus eines Drehschlags hat im Wesentlichen folgende Phasen. Die Klauen 28 des Hammers 22 liegen an dem Amboss 26 an. Die drehende Antriebswelle 23 zieht den Hammer 22 wegen der Kulisse 24 von dem Amboss 26 gegen die Kraft der Feder 25 weg, bis die Klauen 28 mit dem Amboss 26 außer Eingriff sind. Getrieben durch die Feder 25 bewegt sich der Hammer 22 in Richtung zu dem Amboss 26 und wird dabei durch die Kulisse 24 in eine Drehbewegung versetzt. Die Klauen 28 schlagen schließlich tangential an dem Amboss 26 an.The exemplary expansion anchors 1 can be set by means of an adapted impact wrench 20 . The impact wrench 20 has a percussion mechanism 21 which periodically generates rotary impacts. A hammer 22 is mounted on a drive shaft 23 by means of a helical link 24 . A spring 25 presses the hammer 22 along the output shaft 23 in the direction of an anvil 26th The anvil 26 is rigidly connected to an output shaft 27 . The drive shaft 23 and the output shaft 27 are rotatable relative to each other. The hammer 22 and the anvil 26 have projecting jaws 28 along the drive shaft 23 , via which the hammer 22 can transmit torque to the anvil 26 . An electric motor 29 drives the drive shaft 23 . One cycle of a rotary stroke has essentially the following phases. The claws 28 of the hammer 22 abut the anvil 26 . The rotating drive shaft 23 pulls the hammer 22 away from the anvil 26 against the force of the spring 25 because of the link 24 until the dogs 28 are disengaged from the anvil 26 . Driven by the spring 25 , the hammer 22 moves in the direction of the anvil 26 and is thereby set by the link 24 in a rotational movement. The jaws 28 eventually strike tangentially against the anvil 26 .

Eine Ausführungsform des Schlagschraubers 20 hat eine Eingabeeinrichtung 30, mittels welche ein Anwender ein Anzugsdrehmoment des Spreizanker 1 eingeben kann. Die Eingabeeinrichtung 30 beinhaltet beispielsweise einen Taster 31 oder eine Tastatur und ein Anzeigeelement 32. Alternativ oder zusätzlich kann eine Eingabeeinrichtung vorgesehen sein, über welche der Anwender einen Typ für einen Spreizanker einstellen kann. Beispielsweise sind zwei Taster zum Wählen einer Bauart des Spreizankers und eine Größe des Spreizankers vorgesehen. Der gewählte Typ kann beispielsweise in einem Display oder über mehrere LEDs angezeigt werden.An embodiment of the impact wrench 20 has an input device 30 , by means of which a user can input a tightening torque of the expansion anchor 1 . The input device 30 includes, for example, a button 31 or a keyboard and a display element 32 . Alternatively or additionally, an input device may be provided, via which the user can set a type for an expansion anchor. For example, two buttons for selecting a type of expansion anchor and a size of the expansion anchor are provided. The selected type can be displayed, for example, in a display or via several LEDs.

Eine weitere Ausführungsform des Schlagschraubers hat eine Erkennungseinrichtung 33, welche den Typ des Spreizankers 1 ermittelt (101). Die Erkennungseinrichtung 33 beinhaltet beispielsweise eine Leseeinheit 34 für einen RFID Chip. Der erkannte Typ kann der Eingabeeinrichtung 30 übermittelt werden, unter Anderem damit der erkannte Typ dem Anwender angezeigt wird. Die Erkennungseinrichtung 33 kann auch eine Kamera beinhalten, welche anhand von Form und Größe den Typ des Spreizankers ermittelt.Another embodiment of the impact wrench has a detection device 33 , which determines the type of the expansion anchor 1 (101). The recognition device 33 includes, for example, a reading unit 34 for an RFID chip. The recognized type can be the Input device 30 are transmitted, among other things so that the recognized type is displayed to the user. The recognition device 33 may also include a camera, which determines the type of expansion anchor on the basis of shape and size.

Eine Steuerungseinrichtung 35 liest das eingegebene Anzugsdrehmoment von der Eingabeeinrichtung 30 bzw. von der Erkennungseinrichtung 33 ein (100). Die Steuerungseinrichtung 35 ermittelt anhand des eingegebenen Anzugsdrehmoment eine Drehzahl N_soll für die Antriebswelle 23 (101). Beispielsweise sind in einer Speichereinrichtung 36 zu verschiedenen Anzugsdrehmomenten zugeordnete Drehzahlen abgelegt. Nachdem ein Anwender den Elektromotor 29 mittels eines Tasters 37 aktiviert, prüft die Steuerungseinrichtung 35, ob zuvor eine Drehzahl N vorgegeben wurde (102), also z.B. durch Vorgabe des Ankertyps oder des Anzugsdrehmoments. Die Steuerungseinrichtung 35 kann ein Aktivieren des Motors 29 beispielsweise unterbinden, falls bisher kein Anzugsdrehmoment ausgewählt wurde, sondern den Anwender zu einer Eingabe auffordern (103). Die Steuerungseinrichtung 35 regelt den Elektromotor 29 derart, dass die Antriebswelle 23 sich mit der vorgegebenen Drehzahl N dreht (104). Die Drehzahl der Antriebswelle 23 gibt die Wiederholungsrate der Drehschläge vor. Es wurde erkannt, dass mit einem Absenken der Drehzahl nicht nur Frequenz der Drehschläge absinkt, welches soweit für das Setzen des Spreizankers unerheblich ist, sondern auch das mit jedem Drehschlag ausgeübte Drehmoment abgesenkt wird. Jeder der Drehzahlen ist, zwar mit einer großen Toleranz, ein Drehmoment zugeordnet. In einer Ausgestaltung beginnt der Schlagschrauber 38 die Zugstange 2 mit einer ihm maximal möglichen Drehzahl zu drehen. Nach einer Dauer, welche vorzugsweise durch den eingegeben Typ des Spreizankers 1 festgelegt wird, senkt der Schlagschrauber die Drehzahl auf die in Abhängigkeit des Anzugsdrehmoments vorgegebene Drehzahl ab.A controller 35 reads in the input tightening torque from the input device 30 and the recognizer 33, respectively ( 100 ). The control device 35 determines based on the input tightening torque a speed N_soll for the drive shaft 23 ( 101 ). For example, rotational speeds assigned to different tightening torques are stored in a memory device 36 . After a user activates the electric motor 29 by means of a button 37 , the control device 35 checks whether a rotational speed N has previously been predetermined ( 102 ), that is, for example, by specifying the type of armature or the tightening torque. The control device 35 may inhibit activation of the motor 29, for example, if no tightening torque was selected so far, but instead prompt the user for an input ( 103 ). The control device 35 controls the electric motor 29 such that the drive shaft 23 rotates at the predetermined speed N ( 104 ). The rotational speed of the drive shaft 23 specifies the repetition rate of the rotational shocks. It was recognized that with a lowering of the speed not only frequency of the rotational shocks decreases, which is so far irrelevant for the setting of the expansion anchor, but also the torque exerted with each rotational shock is lowered. Each of the speeds is assigned, although with a large tolerance, a torque. In one embodiment, the impact wrench 38 begins to turn the pull rod 2 with a maximum possible speed to him. After a period of time, which is preferably determined by the input type of the expansion anchor 1 , the impact wrench lowers the rotational speed to the rotational speed predetermined in dependence on the tightening torque.

An der Abtriebswelle 27 ist ein Drehzahlsensor 39 angeordnet. Der Drehzahlsensor 39 beinhaltet beispielsweise mehrere axiale Rippen 40, welche entlang des Umfangs der Abtriebswelle 27 in konstanten ersten Winkelabständen angeordnet sind. Zwei Magnetfeldsensoren 41, z.B. Hallsensoren, sind zueinander versetzt in einem zweiten Winkelabstand angeordnet. Der zweite Winkelabstand modulo den ersten Winkelabstand liegt im Bereich zwischen 20 % und 33 % des ersten Winkelabstands. Der Drehzahlsensor 39 erkennt neben der Drehzahl auch den Umlaufsinn des Abtriebswelle 27. Nach einem Drehschlag kann sich Abtriebswelle 27 gegen die vorgegebene Drehrichtung bewegen. Der Drehzahlsensor 39 ermittelt basierend auf der Drehrichtung die effektive Drehzahl d der Abtriebswelle 27 im vorgegebenen Drehsinn (105), z.B. mittels eines Integrators. Die Drehzahl d der Abtriebswelle 27 ist im wesentlichen identisch zu der Drehzahl der Zugstange 2 und dient damit als Maß für den Fortschritt des Drehens der Zugstange bzw. deren axiale Verschieben relativ zu der Spreizhülse 3.On the output shaft 27 , a speed sensor 39 is arranged. The speed sensor 39 includes, for example, a plurality of axial ribs 40 which are arranged along the circumference of the output shaft 27 at constant first angular intervals. Two magnetic field sensors 41 , eg Hall sensors, are arranged offset to one another at a second angular distance. The second angular distance modulo the first angular distance is in the range between 20% and 33% of the first angular distance. The speed sensor 39 detects not only the rotational speed but also the direction of rotation of the output shaft 27 . After a rotational shock output shaft 27 can move against the predetermined direction of rotation. The rotational speed sensor 39 determines, based on the direction of rotation, the effective rotational speed d of the output shaft 27 in the predetermined direction of rotation ( 105 ), for example by means of an integrator. The rotational speed d of the output shaft 27 is substantially identical to the rotational speed of the drawbar 2 and thus serves as a measure of the progress of the rotation of the pull rod or its axial displacement relative to the expansion sleeve. 3

Der Schlagschrauber 20 vergleicht eine erfasste Drehzahl d der Abtriebswelle 27 mit einem vorgegebenen Schwellwert D für die Drehzahl (106). Unterschreitet die mittlere Drehzahl d den Schwellwert D, schaltet die Steuerungseinrichtung 35 den Motor 29 ab (109). Die Abtriebswelle 27z bewegt sich nun im Mittel um einen sehr kleinen Winkel oder gar nicht mehr. Der Schwellwert D kann beispielsweise fest durch den Schlagschrauber 20 vorgegeben sein. Zusätzlich kann der Schlagschrauber 20 die Drehschläge einstellen, wenn eine maximale Dauer T zum Setzen eines Setzankers 1 nach dem Betätigen des Tasters 37 vergangen ist (107). Der Steuerungseinrichtung 35 kann hierzu die Zeit t seit des Betätigen des Tasters 37 erfassen. Dies kann auf ein Fehlverhalten des Spreizankers 1 zurückführbar sein, z.B. dreht sich die Spreizhülse 3 in dem Bohrloch mit. Der Schlagschrauber 20 erkennt dies als ein Fehlverhalten und gibt ein entsprechendes Warnsignal aus.The impact wrench 20 compares a detected rotational speed d of the output shaft 27 with a predetermined threshold value D for the rotational speed ( 106 ). If the average speed d falls below the threshold value D, the control device 35 switches off the motor 29 ( 109 ). The output shaft 27z now moves on average by a very small angle or not at all. The threshold value D can be fixed, for example, by the impact wrench 20 . In addition, the impact wrench 20 can stop the rotation when a maximum time T for setting a setting anchor 1 has elapsed after the operation of the button 37 (FIG. 107 ). For this purpose, the control device 35 can detect the time t since the actuation of the pushbutton 37 . This can be traceable to a malfunction of the expansion anchor 1 , for example, the expansion sleeve 3 rotates in the borehole. The impact wrench 20 detects this as a misconduct and outputs a corresponding warning signal.

In einer Weiterbildung kann der Schlagschrauber 20 eine Aufzeichnungseinrichtung 42 aufweisen, welche zu jedem gesetzten Spreizanker 1 ein Protokoll aufzeichnet (108). Die Aufzeichnungseinrichtung 42 beinhaltet beispielsweise ein Speicherbauelement und eine Kommunikationsschnittstelle zum Ausgeben des Inhalts des Speicherbauelements. Die Spreizanker 1 sind mit einer eindeutigen Kennung versehen, z.B. einer Nummer eines RFID Chips. Die Erkennungseinrichtung 33 bestimmt vor dem Setzen eines Spreizankers 1 dessen eindeutige Kennung. Falls eine automatische Kennung nicht erfolgreich oder nicht vorgesehen ist, kann eine manuelle Eingabe der Kennung erfolgen. Während des Setzens kann beispielsweise die Anzahl der Drehschläge oder die Dauer des Setzvorgangs aufgezeichnet werden. Zusätzlich oder alternativ kann aufgezeichnet werden, wie sich die Drehzahl der Abtriebswelle 27 ändert, insbesondere die Drehzahl zum Zeitpunkt des Abschaltens des Schlagschrauber ist. Hierbei wird die Drehzahl auch aufgezeichnet, wenn der Anwender ein Setzen des Spreizankers durch Lösen des Tasters 37 beendet. Die von der Aufzeichnungseinrichtung 42 protokollierten Daten können über eine drahtlose oder leitungsgebundene Schnittstelle ausgelesen werden.In a further development, the impact wrench 20 may have a recording device 42 which records a protocol for each set expansion anchor 1 ( 108 ). The recording device 42 includes, for example, a memory device and a communication interface for outputting the content of the memory device. The expansion anchors 1 are provided with a unique identifier, such as a number of an RFID chip. The detection device 33 determines before setting an expansion anchor 1 whose unique identifier. If an automatic identifier is not successful or not provided, the identifier can be entered manually. During setting, for example, the number of swings or the duration of the setting process can be recorded. Additionally or alternatively, it can be recorded how the rotational speed of the output shaft 27 changes, in particular the rotational speed at the time of the shutdown of the impact wrench. In this case, the speed is also recorded when the user stops setting the expansion anchor by releasing the button 37 . The data logged by the recording device 42 can be read out via a wireless or wired interface.

Claims (10)

Setzverfahren für einen Spreizanker durch repetitives Ausüben von Drehschlägen auf eine Zugstange (2) des Spreizankers (1) mittels eines Schlagschraubers, wobei eine Wiederholungsrate (Nsoll) der Drehschläge in Abhängigkeit eines zum Verspreizen einer Spreizhülse (3) des Spreizankers (1) vorgegebenen Anzugsdrehmoments eingestellt wird, und der Schlagschrauber das Ausüben von Drehschlägen einstellt, wenn eine erfasste mittlere Drehzahl der Zugstange (d) einen Schwellwert (D) unterschreitet.Setting method for an expansion anchor by repetitive exerting of rotational shocks on a pull rod (2) of the expansion anchor (1) by means of a impact wrench, wherein a repetition rate (Nset) of the rotary latches in dependence of a spreading of an expansion sleeve (3) of the expansible anchor (1) predetermined tightening torque set is set, and the impact wrench sets the application of rotational shocks when a detected average rotational speed of the tie rod (d) is below a threshold value (D). Setzverfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Schlagschrauber ansprechend auf eine Eingabe eines Typs des Spreizankers oder des Anzugsdrehmoments die Wiederholungsrate einstellt.The setting method according to claim 1, characterized in that the impact wrench sets the repetition rate in response to an input of a type of the expansion anchor or the tightening torque. Setzverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Schlagschrauber eine Dauer für ein Setzen des Spreizankers erfasst und wenn die Dauer einen Schwellwert überschreitet, ein Warnsignal ausgibt.Setting method according to claim 1 or 2, characterized in that the impact wrench detects a duration for setting the expansion anchor and when the duration exceeds a threshold value, outputs a warning signal. Setzverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Schlagschrauber auf die Zugstange Drehschlage mit einer dem Schlagschrauber maximal möglichen Wiederholungsrate für eine erste Dauer ausübt, und nach der ersten Dauer auf die durch das Anzugsdrehmoment vorgegebene Wiederholungsrate wechselt.Setting method according to one of the preceding claims, characterized in that the impact wrench on the pull rod rotary punch with a maximum possible repetition rate of the impact wrench exerts a first duration, and after the first duration to the predetermined by the tightening torque repetition rate changes. Setzverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Aufzeichnungseinrichtung des Schlagschrauber einen oder mehrere Parameter während des Ausübens der Drehschläge aufzeichnet: Kennung des Spreizankers, Anzahl der Drehschläge die auf den Spreizanker ausgeübt werden, Dauer für die Drehschläge auf den Spreizanker ausgeübt werden, Abbruch des Setzens durch den Anwender, Unterschreiten des Schwellwerts durch die mittlere Drehzahl der Zugstange.Setting method according to one of the preceding claims, characterized in that a recording device of the impact wrench records one or more parameters during the exertion of the rotary beats: identification of the expansion anchor, number of rotary strikes which are exerted on the expansion anchor, duration for the rotational shocks are exerted on the expansion anchor, Cancellation of setting by the user, below the threshold by the average speed of the drawbar. Schlagschrauber zum Setzen eines Spreizankers mit
einer Einleseeinrichtung (30) zum Festlegen eines Typs des Spreizankers (1) oder eines Anzugsdrehmoment für den Spreizanker (1);
einem Schlagwerk (21) zum Erzeugen von repetitiven Drehschlägen,
einer Steuerungseinrichtung (35), die eine Wiederholungsrate der Drehschlage in Abhängigkeit des festgelegten Typs des Spreizankers (1) oder des festgelegten Anzugsdrehmoments einstellt,
einem Sensor (39) zum Erfassen einer Drehzahl der Zugstange (2),
eine Abschalteinrichtung, die das Schlagwerk (21) deaktiviert, wenn die erfasste Drehzahl einen Schwellwert unterschreitet.Impact wrench for setting an expansion anchor with
a read-in device (30) for determining a type of the expansion anchor (1) or a tightening torque for the expansion anchor (1);
a striking mechanism (21) for generating repetitive rotary strikes,
a control device (35) which sets a repetition rate of the rotary lobe in dependence on the specified type of the expansion anchor (1) or the specified tightening torque,
a sensor (39) for detecting a rotational speed of the drawbar (2),
a shutdown device which deactivates the percussion mechanism (21) when the detected speed falls below a threshold value. Schlagschrauber nach Anspruch 6, dadurch gekennzeichnet, dass das Schlagwerk (21) einen Drehschläger (22) aufweist, der durch eine spiralförmige Kulisse (24) auf einer Antriebswelle geführt ist,
einen mit einer Abtriebswelle (27) starr verbundenen Amboss (26),
einen Feder (25), die den Drehschläger (22) in Richtung zu dem Amboss (26) vorspannt, und
einen Elektromotor (29), der mit der Antriebswelle (23) gekoppelt ist.Impact wrench according to claim 6, characterized in that the impact mechanism (21) has a rotary beater (22), which is guided by a spiral-shaped link (24) on a drive shaft,
a anvil (26) rigidly connected to an output shaft (27),
a spring (25) biasing the rotary beater (22) towards the anvil (26), and
an electric motor (29) coupled to the drive shaft (23). Schlagschrauber nach Anspruch 7, dadurch gekennzeichnet, dass der Sensor (39) zum Erfassen einer Drehzahl mehrere über Magnetfeldsensoren (41) erfassbare Markierungen (40) entlang des Umfangs der Abtriebswelle (27) und wenigstens zwei zueinander winkelversetzt angeordnete Magnetfeldsensoren (41) zum Erfassen einer Drehbewegung und Drehrichtung der Abtriebswelle (27) aufweist.Impact wrench according to claim 7, characterized in that the sensor (39) for detecting a rotational speed a plurality of magnetic field sensors (41) detectable markings (40) along the circumference of the output shaft (27) and at least two mutually angularly arranged magnetic field sensors (41) for detecting a Having rotational movement and direction of rotation of the output shaft (27). Schlagschrauber nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Steuerungseinrichtung (35) eine Drehzahl des Elektromotors in Abhängigkeit der Typs des Spreizankers oder des eingegebenen Anzugsdrehmoments einstellt.Impact wrench according to one of claims 6 to 8, characterized in that the control device (35) adjusts a rotational speed of the electric motor depending on the type of expansion anchor or the entered tightening torque. Schlagschrauber nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der Schlagschrauber eine Erkennungseinrichtung (33) zum Ermitteln einer eindeutigen Kennung des Spreizankers aufweist und eine Aufzeichnungseinrichtung (42) zum Aufzeichnen von einem oder mehrerer Parameter während des Ausübens der Drehschläge: Kennung des Spreizankers, Anzahl der Drehschläge die auf den Spreizanker ausgeübt werden, Dauer für die Drehschläge auf den Spreizanker ausgeübt werden, Abbruch des Setzens durch den Anwender, Unterschreiten des Schwellwerts durch die mittlere Drehzahl der Zugstange.Impact wrench according to one of claims 6 to 9, characterized in that the impact wrench has a detection device (33) for determining a unique identifier of the expansion anchor and a recording device (42) for recording one or more parameters during the exercise of the rotational shocks: identification of the expansion anchor , Number of swings that are exerted on the expansion anchor, duration for the rotational shocks are exerted on the expansion anchor, discontinuation of setting by the user, below the threshold by the average speed of the drawbar.
EP12151662.9A 2011-03-04 2012-01-19 Method for setting a split anchor and screwdriver for setting a split anchor Active EP2495076B1 (en)

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HK1173699A1 (en) 2013-05-24
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CN102653050B (en) 2016-05-04
US20120222876A1 (en) 2012-09-06
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US9233458B2 (en) 2016-01-12
DE102011005079A1 (en) 2012-09-06

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