EP1397231B1 - Press tool comprising a spindle for moulding coupling elements - Google Patents

Press tool comprising a spindle for moulding coupling elements Download PDF

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Publication number
EP1397231B1
EP1397231B1 EP02732298A EP02732298A EP1397231B1 EP 1397231 B1 EP1397231 B1 EP 1397231B1 EP 02732298 A EP02732298 A EP 02732298A EP 02732298 A EP02732298 A EP 02732298A EP 1397231 B1 EP1397231 B1 EP 1397231B1
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EP
European Patent Office
Prior art keywords
spindle
pressing tool
pressure
force
tool according
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.)
Expired - Lifetime
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EP02732298A
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German (de)
French (fr)
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EP1397231A1 (en
Inventor
René Amherd
Paul Dummermuth
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Von Arx AG
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Von Arx AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/048Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods using presses for radially crimping tubular elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042Hand tools for crimping
    • H01R43/0428Power-driven hand crimping tools

Definitions

  • the present invention relates to an electrically operated pressing tool for connecting tubular workpieces with a fork-shaped receptacle, held in this recording by means of a connecting pin interchangeable clamping pliers and a controlled electric drive motor for actuating the clamping pliers, wherein a powered by the electric drive motor via a reduction gear spindle is present is in operative connection with the clamp.
  • Portable, electrically operated pressing tools of the type mentioned are used for pressing of coupling elements, such as press sleeves, press fittings, pipe sleeves, telescoped pipe sections and the like.
  • the pressing tools have a clamping pliers with clamping jaws, which form a pressing space for receiving the coupling element to be pressed.
  • the necessary for the compression Compressive pressure was initially generated by an electric motor connected to the net via an axially forward and backward spindle which acts on a two-roller yoke, the rollers moving the jaws of the clamp.
  • Another advantage of the hydraulically operated pressing tools is the fact that battery-powered electric motors can be used, so you can work independently from the grid. Thanks to the hydraulic drive, it was also possible to use battery-operated electric motors that initially had a relatively low torque.
  • a spindle-type pressing tool is known in which the pressure to be built up is electronically monitored by monitoring the rotational speed of the electric motor and guiding and controlling it with a predetermined profile within a certain range.
  • This characteristic of the compression is essentially dependent on the size, shape and material properties of the coupling elements and thus allows the generation of a compression process that takes place depending on pressure and time.
  • the present invention has set itself the task of changing the design of a pressing tool so that it can be smaller, cheaper and easier to build, without losing the safety aspects.
  • the pressing tool 0 is an electromechanical device, which is realized here as a battery-powered device.
  • the pressing tool 0 has a press tool unit 2 on which a handle 1 is formed.
  • a battery housing 6 is formed as a removable part.
  • a fork-shaped receptacle 3 can be seen.
  • the clamping pliers 4 is held. This is kept secured by means of a monitored securing bolt 5 in the receptacle 3.
  • a trigger switch 8 is available for the operation of the device.
  • On a display unit 7, the functional state of the pressing tool is displayed, while the user is informed by means of LEDs 9, whether a pressing could be performed correctly or not.
  • the electric drive motor 10 acts on a shaft 13.
  • the shaft 13 drives a threaded spindle 14, on which a spindle nut 16 runs and displaces a roller feed element 15, which is moved translationally into the fork-shaped receptacle 3.
  • the electric motor 10 can be designed as a DC or AC motor. Preferably, one will choose a lower mass and high torque electric motor. Such motors are available in the market in various embodiments.
  • the output of the electric motor 10 takes place on a reduction gear 11. This is a completely traditional gear, which is connected via an output 12 with a shaft 13.
  • the connection between the output 12 and the shaft 13 can be realized as a simple, virtually play-free plug connection.
  • the shaft 13 is preferably made in one piece and axially aligned with a threaded spindle 14.
  • the threaded spindle 14 is provided with a suitable for the transmission of large forces trapezoidal thread.
  • the spindle housing 21 which forms part of the housing of the functional unit 2 is delimited in the direction of the clamping tongs 4 by the fork-shaped receptacle 3, the spindle housing 21 is closed by a housing plate 20 on the motor side.
  • the shaft 13 passes through this housing plate 20 and is mounted in the housing plate 20 itself in a radial bearing 19.
  • the shaft 13 is limited to the spindle 14 through a pressure flange 17.
  • a pressure ring 27 which acts directly or indirectly on a force or pressure sensor 25. The simplest way of doing this would be with annular force or pressure sensors available on the market, which would be arranged between the pressure ring 27 and the housing plate 20.
  • a lever 26 and a counter-pressure ring 28 are provided between the pressure ring 27 and the housing plate 20.
  • the relative position of the lever 26, the pressure ring 27 and the counter-pressure ring 28 is rotatably secured by a pin 29, wherein the pin 29 engages in the housing plate 20.
  • balls 24 are inserted, which allow a pivoting movement of the lever 26.
  • the electric motor 10 drives the shaft 13 and the threaded spindle 14 via the reduction gear 11, whereby the spindle nut 16 slides forward in the direction of the fork-shaped receptacle and thus the roller feed element with the rollers 30 in the figure to the right emotional.
  • the rollers 30 run on the cheeks of the jaw 40 of the clamping jaw 4 and close it.
  • the reaction force leads to an increased pressure of the spindle 14 and the associated pressure flange 17 on the thrust bearing 18, which passes this pressure on the pressure ring 27.
  • the entire pressure is finally passed to the rigid housing plate 20.
  • the pressure monitoring realized here ensures that the connecting elements are pressed with the required pressure. Of course, this alone is not enough.
  • the complete closing of the clamping tongs is monitored.
  • Such monitoring can be done by appropriate sensors on the clamp itself or it can be a way monitoring.
  • the displacement path of the roller feed element 15 can be monitored by means of corresponding sensors in this case.
  • this sensor not shown here passes a corresponding information to the controller 22, wherein a failure to reach the required path leads to a corresponding error message.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Gripping On Spindles (AREA)
  • Control Of Presses (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

An electrically driven press tool that is compact, reliable and cost-effective. There is a press tool in which a crimping tool is retained in a recess by a bolt. An electromotor drives a spindle, which interacts with the crimping tool, by a reducing gear. The spindle is connected to a shaft by a pressure flange. The bearing pressure, which acts on the spindle, is brought to bear on a pressure ring by a pressure flange and a pressure bearing, the ring acting directly or indirectly on a force or pressure sensor. When a predetermine set value of the crimping is reached, the sensor forwards a switching signal to the controller of the drive motor.

Description

Die vorliegende Erfindung betrifft ein elektrisch betriebenes Presswerkzeug zum Verbinden von rohrförmigen Werkstücken mit einer gabelförmigen Aufnahme, einer in dieser Aufnahme mittels eines Verbindungsbolzens auswechselbar gehaltenen Klemmzange und einem gesteuerten Elektroantriebsmotor zur Betätigung der Klemmzange, wobei eine vom Elektroantriebsmotor über ein Untersetzungsgetriebe angetriebene Spindel vorhanden ist, die mit der Klemmzange in Wirkverbindung steht.The present invention relates to an electrically operated pressing tool for connecting tubular workpieces with a fork-shaped receptacle, held in this recording by means of a connecting pin interchangeable clamping pliers and a controlled electric drive motor for actuating the clamping pliers, wherein a powered by the electric drive motor via a reduction gear spindle is present is in operative connection with the clamp.

Tragbare, elektrisch arbeitende Presswerkzeuge der eingangs genannten Art werden zur Verpressung von Kupplungselementen, wie Presshülsen, Pressfittingen, Rohrmuffen, ineinander geschobenen Rohrabschnitten und ähnlichem eingesetzt. Die Presswerkzeuge weisen eine Klemmzange mit Klemmbacken auf, welche einen Pressraum zur Aufnahme des zu verpressenden Kupplungselementes bilden. Der für die Verpressung notwendige Pressdruck wurde anfänglich von einem mit dem Netz verbundenen Elektromotor über eine axial vor- und zurücklaufende Spindel erzeugt, die auf ein mit zwei Rollen ausgerüstetes Joch wirkt, wobei die Rollen die Klemmbacken der Klemmzange bewegen.Portable, electrically operated pressing tools of the type mentioned are used for pressing of coupling elements, such as press sleeves, press fittings, pipe sleeves, telescoped pipe sections and the like. The pressing tools have a clamping pliers with clamping jaws, which form a pressing space for receiving the coupling element to be pressed. The necessary for the compression Compressive pressure was initially generated by an electric motor connected to the net via an axially forward and backward spindle which acts on a two-roller yoke, the rollers moving the jaws of the clamp.

Diese Presswerkzeuge haben sich heute durchgesetzt und sind ausserordentlich verbreitet. In der Entwicklung ist man jedoch in neuerer Zeit immer mehr von den spindelgetriebenen Versionen abgerückt und hat hydraulisch arbeitende Presswerkzeuge eingesetzt. Bei diesen hydraulisch arbeitenden Presswerkzeugen wird nach wie vor mit einem elektromotorischen Antrieb gearbeitet, der aber nun eine Pumpe betätigt, mittels der ein Kolben verschoben wird, dessen Kolbenstange auf das Joch wirkt, in dem die beiden genannten Rollen lagern. Diese hydraulisch arbeitenden Presswerkzeuge lassen sich ausserordentlich exakt steuern durch eine kombinierte Überwachung des aufzubauenden hydraulischen Druckes sowie einer Wegüberwachung, die das exakte Schliessen der Klemmzange überprüft.These pressing tools have prevailed today and are extremely widespread. In the development, however, one has moved more and more recently from the spindle-driven versions and has used hydraulically operated pressing tools. In these hydraulic pressing tools is still working with an electric motor drive, but now operates a pump by means of which a piston is moved, the piston rod acts on the yoke, in which store the two roles mentioned. These hydraulically operated pressing tools can be controlled extremely precisely by a combined monitoring of the hydraulic pressure to be built up and a position monitoring, which checks the exact closing of the clamping tongs.

Ein weiterer Vorteil der hydraulisch arbeitenden Presswerkzeuge ist darin zu sehen, dass auch akkubetriebene Elektromotoren eingesetzt werden können, womit man vom Netz unabhängig arbeiten kann. Dank dem hydraulischen Antrieb liessen sich auch akkubetriebene Elektromotoren einsetzen, die anfänglich noch ein relativ geringes Drehmoment hatten.Another advantage of the hydraulically operated pressing tools is the fact that battery-powered electric motors can be used, so you can work independently from the grid. Thanks to the hydraulic drive, it was also possible to use battery-operated electric motors that initially had a relatively low torque.

Für alle vorgenannten Presswerkzeuge wurden unterschiedliche Klemmzangen eingesetzt entsprechend der grossen Anzahl von unterschiedlichen Kupplungselementen für einen grossen Bereich unterschiedlichster Durchmesser. Die Durchmesser gebräuchlicher Kupplungselemente liegen im Bereich von 10 bis über 100 mm. Der häufigste Einsatzbereich liegt jedoch zwischen 10 und 30 mm. Trotzdem wurden praktisch alle heute auf dem Markt angebotenen Presswerkzeuge für den gesamten Anwendungsbereich ausgelegt. Dies bedeutet, dass entsprechend grosse Pressdrucke erzeugt werden müssen. Entsprechend sind die heute bekannten Presswerkzeuge relativ gross und entsprechend schwer. Obwohl eine entsprechende Nachfrage besteht für tragbare, kleinere und leichtere Presswerkzeuge für den gängigsten Bereich zwischen beispielsweise 10 und 50 mm Durchmesser der Kupplungselemente, sind bis heute solche Geräte auf dem Markt nicht erhältlich. Ein wesentlicher Grund hierfür liegt vor allem in der Sicherheit und Überwachung des Druckes, der von den Presswerkzeugen aufgebaut wird. Die entstehenden Drucke, die mit hydraulischen Systemen aufgebaut werden, bedingen eine entsprechend schwere und sichere Auslegung des Presswerkzeuges und eine entsprechende massstabliche Reduktion ist nicht möglich, ohne dass völlig andere Klemmzangen verwendet werden. Um bei den spindelgetriebenen Presswerkzeugen die erforderliche Sicherheit zu erhalten, wurde zwischen dem Elektromotor und der Spindel dem Getriebe vor- oder nachgelagert entsprechend aus Sicherheitsgründen eine Kupplung eingebaut. Dies hat die spindelgetriebenen Geräte insgesamt schwerer, teurer und grösser gemacht. Geräte der hier beschriebenen Art werden von verschiedenen Anbietern auf den Markt gebracht.For all of the above pressing tools different clamping forceps were used according to the large number of different coupling elements for a wide range of different diameters. The diameters of conventional coupling elements are in the range of 10 to over 100 mm. However, the most common application is between 10 and 30 mm. Nevertheless, virtually all press tools available on the market today have been designed for the entire range of applications. This means that correspondingly large pressing pressures must be generated. Accordingly, the pressing tools known today are relatively large and correspondingly heavy. Although there is a corresponding demand for portable, smaller and lighter pressing tools for the most common range between, for example, 10 and 50 mm diameter of the coupling elements, such devices are still not available on the market today. A key reason for this lies above all in the safety and monitoring of the pressure that is built up by the pressing tools. The resulting prints, which are constructed with hydraulic systems, require a correspondingly heavy and safe design of the pressing tool and a corresponding dimensional reduction is not possible without completely different clamping tongs are used. In order to obtain the required safety in the spindle-driven pressing tools, a clutch was installed upstream or downstream between the electric motor and the spindle for safety reasons. This has made the spindle driven devices altogether heavier, more expensive and more expensive made bigger. Devices of the type described here are brought to market by various suppliers.

Aus der US-PS-6,035,775 ist ein mit einer Spindel arbeitendes Presswerkzeug bekannt, bei dem der aufzubauende Druck elektronisch überwacht wird, indem die Rotationsgeschwindigkeit des Elektromotors überwacht und mit einem vorgegebenen Profil innerhalb einer gewissen Bandbreite geführt und kontrolliert wird. Diese Charakteristik der Verpressung ist im wesentlichen abhängig von Grösse, Gestalt und Materialbeschaffenheit der Kupplungselemente und erlaubt somit die Erzeugung eines Verpressungsvorganges, der druck- und zeitabhängig abläuft.From US-PS-6,035,775 a spindle-type pressing tool is known in which the pressure to be built up is electronically monitored by monitoring the rotational speed of the electric motor and guiding and controlling it with a predetermined profile within a certain range. This characteristic of the compression is essentially dependent on the size, shape and material properties of the coupling elements and thus allows the generation of a compression process that takes place depending on pressure and time.

Die vorliegende Erfindung hat sich zur Aufgabe gesetzt, die Konstruktion eines Presswerkzeuges derart zu ändern, dass dieses kleiner, preisgünstiger und leichter gebaut werden kann, ohne dass dabei die Sicherheitsaspekte verloren gehen.The present invention has set itself the task of changing the design of a pressing tool so that it can be smaller, cheaper and easier to build, without losing the safety aspects.

Diese Aufgabe löst ein Presswerkzeug der eingangs genannten Art mit den Merkmalen des Patentanspruches 1.This object is achieved by a pressing tool of the type mentioned in the introduction with the features of patent claim 1.

Weitere vorteilhafte Ausgestaltungsformen ergeben sich aus den abhängigen Ansprüchen und deren Bedeutung und Wirkungsweise wird in der nachfolgenden Beschreibung unter Bezug auf die beiliegende Zeichnung dargelegt.Further advantageous embodiments will become apparent from the dependent claims and their meaning and effect will be set forth in the following description with reference to the accompanying drawings.

In der Zeichnung ist eine bevorzugte Ausführungsform vereinfacht dargestellt. Es zeigt:

Figur 1
eine mögliche Ausführungsform des Presswerkzeuges in der Gesamtansicht in perspektivischer Darstellung.
Figur 2
zeigt einen axialen Längsschnitt durch den Spindelantrieb in vereinfachter Darstellung.
In the drawing, a preferred embodiment is shown simplified. It shows:
FIG. 1
a possible embodiment of the pressing tool in the overall view in perspective view.
FIG. 2
shows an axial longitudinal section through the spindle drive in a simplified representation.

Das Presswerkzeug 0 ist ein elektromechanisches Gerät, welches hier als akkubetriebenes Gerät realisiert ist. Das Presswerkzeug 0 hat eine Presswerkzeugfunktionseinheit 2, an der ein Griff 1 angeformt ist. In der rückwärtigen Verlängerung ist an der Funktionseinheit 2 ein Akkugehäuse 6 als abnehmbarer Teil angeformt. In der vorderen Verlängerung der Presswerkzeugfunktionseinheit 2 ist eine gabelförmige Aufnahme 3 erkennbar. In der gabelförmigen Aufnahme 3 wird die Klemmzange 4 gehalten. Diese ist mittels einem überwachten Sicherungsbolzen 5 in der Aufnahme 3 gesichert gehalten. Für die Betätigung des Gerätes ist wie üblich ein Auslöseschalter 8 vorhanden. Auf einer Displayeinheit 7 wird der Funktionszustand des Presswerkzeuges angezeigt, während der Benutzer mittels Leuchtdioden 9 informiert wird, ob eine Pressung korrekt durchgeführt werden konnte oder nicht.The pressing tool 0 is an electromechanical device, which is realized here as a battery-powered device. The pressing tool 0 has a press tool unit 2 on which a handle 1 is formed. In the rearward extension of the functional unit 2, a battery housing 6 is formed as a removable part. In the front extension of the press tool unit 2, a fork-shaped receptacle 3 can be seen. In the fork-shaped receptacle 3, the clamping pliers 4 is held. This is kept secured by means of a monitored securing bolt 5 in the receptacle 3. As usual, a trigger switch 8 is available for the operation of the device. On a display unit 7, the functional state of the pressing tool is displayed, while the user is informed by means of LEDs 9, whether a pressing could be performed correctly or not.

Der Aufbau der Funktionseinheit 2 geht im Detail aus der Figur 2 hervor. Deutlich erkennt man hier von links nach rechts in der Zeichnung den Elektroantriebsmotor 10, der über ein Untersetzungsgetriebe 11 und dessen Abtrieb 12 auf eine Welle 13 wirkt. Die Welle 13 treibt eine Gewindespindel 14, auf der eine Spindelmutter 16 läuft und ein Rollenvorschubelement 15 verschiebt, welches in die gabelförmige Aufnahme 3 translatorisch bewegt wird.The construction of the functional unit 2 is shown in detail in FIG. Clearly recognizable here from left to right in the drawing, the electric drive motor 10, the over a reduction gear 11 and the output 12 acts on a shaft 13. The shaft 13 drives a threaded spindle 14, on which a spindle nut 16 runs and displaces a roller feed element 15, which is moved translationally into the fork-shaped receptacle 3.

Der Elektromotor 10 kann beliebig als Gleichstrom- oder Wechselstrommotor ausgelegt werden. Bevorzugterweise wird man einen Elektromotor mit geringerer Masse und hohem Drehmoment wählen. Solche Motoren sind auf dem Markt in verschiedensten Ausführungsformen erhältlich. Der Abtrieb des Elektromotores 10 erfolgt auf ein Untersetzungsgetriebe 11. Hierbei handelt es sich um ein vollkommen traditionelles Getriebe, welches über einen Abtrieb 12 mit einer Welle 13 verbunden ist. Die Verbindung zwischen dem Abtrieb 12 und der Welle 13 kann als einfache, praktisch spielfreie Steckverbindung realisiert sein. Die Welle 13 wird bevorzugterweise einstückig und axial fluchtend mit einer Gewindespindel 14 gefertigt. Die Gewindespindel 14 ist mit einem für die Übertragung von grossen Kräften geeigneten Trapezgewinde versehen. Im Gegensatz zu auf dem Markt bekannten Presswerkzeugen wird also hier nicht mit kugelgelagerter Spindel gearbeitet sondern, wie erwähnt, mit einer einfachen und entsprechend kostengünstigen Gewindespindel 14. Auf der Gewindespindel 14 sitzt eine Spindelmutter 16, die entsprechend dem Antrieb auf der Spindel 14 vor oder zurück läuft. Diese Gewindespindel 16 ist fest verbunden mit einem Rollenvorschubelement 15. Das Rollenvorschubelement 15 ist gleich der Spindel und ein Teil der Welle 13 in einem Spindelgehäuse 21 gelagert. An dieses Spindelgehäuse 21 schliesst die gabelförmige Aufnahme 3 an, in die sich das Rollenvorschubelement 15 vorschiebend und rückziehend bewegt. Das Rollenvorschubelement 15 wird von Achsen 31 durchsetzt, auf denen Rollen 30 lagern, welche mit Klemmbacken 40 der Klemmzange 4 zusammenwirken und entsprechend die Klemmzange 4 schliessen.The electric motor 10 can be designed as a DC or AC motor. Preferably, one will choose a lower mass and high torque electric motor. Such motors are available in the market in various embodiments. The output of the electric motor 10 takes place on a reduction gear 11. This is a completely traditional gear, which is connected via an output 12 with a shaft 13. The connection between the output 12 and the shaft 13 can be realized as a simple, virtually play-free plug connection. The shaft 13 is preferably made in one piece and axially aligned with a threaded spindle 14. The threaded spindle 14 is provided with a suitable for the transmission of large forces trapezoidal thread. In contrast to known in the market pressing tools is thus not working with ball-bearing spindle but, as mentioned, with a simple and correspondingly inexpensive threaded spindle 14. On the threaded spindle 14 sits a spindle nut 16, according to the drive on the spindle 14 back or forth running. This threaded spindle 16 is fixedly connected to a roller feed element 15. The roller feed element 15 is equal to the spindle and a part the shaft 13 mounted in a spindle housing 21. At this spindle housing 21 includes the fork-shaped receptacle 3, in which the roller feed element 15 advancing and retracting moves. The roller feed element 15 is penetrated by axes 31, on which bearings rollers 30 which cooperate with clamping jaws 40 of the clamping tongs 4 and accordingly close the clamping tongs 4.

Während das Spindelgehäuse 21, welches Teil des Gehäuses der Funktionseinheit 2 bildet, in Richtung der Klemmzange 4 von der gabelförmigen Aufnahme 3 begrenzt wird, wird motorseitig das Spindelgehäuse 21 von einer Gehäuseplatte 20 abgeschlossen. Die Welle 13 durchsetzt diese Gehäuseplatte 20 und ist in der Gehäuseplatte 20 selber in einem Radiallager 19 gelagert. Die Welle 13 wird zur Spindel 14 hin durch einen Druckflansch 17 begrenzt. Zwischen diesem Druckflansch 17 und der Gehäuseplatte 20 liegt ein axiales Drucklager 18, ein Druckring 27, der direkt oder mittelbar auf einen Kraft- oder Drucksensor 25 wirkt. Konstruktiv am einfachsten könnte dies mit auf dem Markt vorhandenen ringförmigen Kraft- oder Drucksensoren erfolgen, die man zwischen dem Druckring 27 und der Gehäuseplatte 20 anordnen würde. Solche Kraft- oder Drucksensoren sind aber heute noch sehr kostspielig und entsprechend wurde hier eine Lösung aufgezeigt, bei der mit einem kleinen und äusserst preiswerten piezoelektrischen Kraft- oder Drucksensor 25 gearbeitet werden kann. Es käme aber durchaus mit einer konstruktiven Anpassung in Frage, einen Dehnungsmessstreifen als Kraftsensor einzusetzen.While the spindle housing 21, which forms part of the housing of the functional unit 2, is delimited in the direction of the clamping tongs 4 by the fork-shaped receptacle 3, the spindle housing 21 is closed by a housing plate 20 on the motor side. The shaft 13 passes through this housing plate 20 and is mounted in the housing plate 20 itself in a radial bearing 19. The shaft 13 is limited to the spindle 14 through a pressure flange 17. Between this pressure flange 17 and the housing plate 20 is an axial thrust bearing 18, a pressure ring 27 which acts directly or indirectly on a force or pressure sensor 25. The simplest way of doing this would be with annular force or pressure sensors available on the market, which would be arranged between the pressure ring 27 and the housing plate 20. However, such force or pressure sensors are still very expensive today and accordingly a solution has been pointed out in which a small and extremely inexpensive piezoelectric force or pressure sensor 25 can be used. But it would be quite possible with a constructive adaptation to use a strain gauge as a force sensor.

Hierzu sind zwischen dem Druckring 27 und der Gehäuseplatte 20 ein Hebel 26 und ein Gegendruckring 28 vorgesehen. Die Relativlage des Hebels 26, des Druckringes 27 sowie des Gegendruckringes 28 ist durch einen Stift 29 rotativ gesichert, wobei der Stift 29 in die Gehäuseplatte 20 eingreift. Einerseits zwischen dem Gegendruckring 28 und dem Hebel 26 und andererseits zwischen dem Hebel 26 und dem Druckring 27 sind Kugeln 24 eingelegt, die eine Schwenkbewegung des Hebels 26 zulassen.For this purpose, a lever 26 and a counter-pressure ring 28 are provided between the pressure ring 27 and the housing plate 20. The relative position of the lever 26, the pressure ring 27 and the counter-pressure ring 28 is rotatably secured by a pin 29, wherein the pin 29 engages in the housing plate 20. On the one hand between the counter-pressure ring 28 and the lever 26 and on the other hand between the lever 26 and the pressure ring 27 balls 24 are inserted, which allow a pivoting movement of the lever 26.

Betätigt ein Benutzer den Auslöseschalter 8, so treibt der Elektromotor 10 über das Untersetzungsgetriebe 11 die Welle 13 und die Gewindespindel 14, wodurch die Spindelmutter 16 in Richtung zur gabelförmigen Aufnahme hin nach vorne gleitet und damit das Rollenvorschubelement mit den Rollen 30 in der Figur nach rechts bewegt. Die Rollen 30 laufen auf den Wangen der Klemmbacke 40 der Klemmzange 4 und schliessen diese. Die Reaktionskraft führt zu einem erhöhten Druck der Spindel 14 und des damit verbundenen Druckflansches 17 auf das Drucklager 18, welches diesen Druck auf den Druckring 27 weitergibt. Der gesamte Druck wird schliesslich auf die starre Gehäuseplatte 20 geleitet. Entweder führt, wie bereits erwähnt, die Reaktionskraft vom Druckring 27 direkt auf einen Kraft- oder Drucksensor 25 oder, wie hier dargestellt, erfolgt der Druck über das Hebelsystem mit den Kugeln 24, wobei der Hebel 26 eine geringe Schwenkbewegung bzw. eine geringe Verformung durchführt, die zu einem Druck auf den Kraft- oder Drucksensor 25 führt. Erreicht dieser Druck einen vorgegebenen Grenzwert, so wird ein Signal S vom Kraft- oder Drucksensor 25 auf eine Steuerung 22 ausgelöst und die Steuerung 22 führt zu einer Umschaltung des Elektromotores 10, der nun in die Gegenrichtung dreht. Als Folge hiervon läuft die Gewindespindel 14 in die umgekehrte Drehrichtung und entsprechend läuft die Spindelmutter 16 zurück in die Ausgangslage.If a user actuates the trigger switch 8, the electric motor 10 drives the shaft 13 and the threaded spindle 14 via the reduction gear 11, whereby the spindle nut 16 slides forward in the direction of the fork-shaped receptacle and thus the roller feed element with the rollers 30 in the figure to the right emotional. The rollers 30 run on the cheeks of the jaw 40 of the clamping jaw 4 and close it. The reaction force leads to an increased pressure of the spindle 14 and the associated pressure flange 17 on the thrust bearing 18, which passes this pressure on the pressure ring 27. The entire pressure is finally passed to the rigid housing plate 20. Either leads, as already mentioned, the reaction force from the pressure ring 27 directly to a force or pressure sensor 25 or, as shown here, the pressure via the lever system with the balls 24, wherein the lever 26 performs a small pivoting movement or a small deformation , which leads to a pressure on the force or pressure sensor 25. If this pressure reaches one predetermined limit value, a signal S from the force or pressure sensor 25 is triggered on a controller 22 and the controller 22 results in a switching of the electric motor 10, which now rotates in the opposite direction. As a result, the threaded spindle 14 runs in the reverse direction of rotation and accordingly the spindle nut 16 runs back to the starting position.

Durch die hier realisierte Drucküberwachung wird sichergestellt, dass die Verbindungselemente mit dem erforderlichen Druck verpresst werden. Dies allein genügt selbstverständlich nicht. Zusätzlich wird, obwohl hier nicht dargestellt, auch die vollständige Schliessung der Klemmzange überwacht. Diesbezüglich kann auf die bereits bekannte ausführliche Patentliteratur verwiesen werden. Eine solche Überwachung kann durch entsprechende Sensoren an der Klemmzange selber erfolgen oder es kann eine Wegüberwachung erfolgen. Bei der Wegüberwachung kann in diesem Falle der Verschiebungsweg des Rollenvorschubelementes 15 mittels entsprechender Sensoren überwacht werden. Auch dieser hier nicht dargestellte Sensor leitet eine entsprechende Information an die Steuerung 22, wobei ein Nichterreichen des erforderlichen Weges zu einer entsprechenden Fehlermeldung führt.The pressure monitoring realized here ensures that the connecting elements are pressed with the required pressure. Of course, this alone is not enough. In addition, although not shown here, also the complete closing of the clamping tongs is monitored. In this regard, reference may be made to the already known detailed patent literature. Such monitoring can be done by appropriate sensors on the clamp itself or it can be a way monitoring. In the path monitoring, the displacement path of the roller feed element 15 can be monitored by means of corresponding sensors in this case. Also, this sensor, not shown here passes a corresponding information to the controller 22, wherein a failure to reach the required path leads to a corresponding error message.

Liste der BezugszahlenList of reference numbers

00
Presswerkzeugpress tool
11
GriffHandle
22
Funktionseinheitfunctional unit
33
Aufnahmeadmission
44
Klemmzangelocking pliers
55
Verbindungsbolzenconnecting bolts
66
Akkugehäusebattery case
77
Displaydisplay
88th
Auslöseschaltertrigger switch
99
LeuchtdiodenLEDs
1010
Elektromotorelectric motor
1111
UntersetzungsgetriebeReduction gear
1212
Abtrieboutput
1313
Wellewave
1414
Gewindespindelscrew
1515
RollenvorschubelementRoll feed element
1616
Spindelmutterspindle nut
1717
Druckflanschpressure flange
1818
Drucklagerthrust bearing
1919
Radiallagerradial bearings
2020
Gehäuseplattehousing plate
2121
Spindelgehäusespindle housing
2222
Steuerungcontrol
2424
Kugelnroll
2525
Kraft- oder DrucksensorForce or pressure sensor
2626
Hebellever
2727
Druckringpressure ring
2828
GegendruckringCounterpressure ring
2929
Stiftpen
3030
Rollenroll
3131
Achsenaxes

Claims (9)

  1. An electrically operated pressing tool (0) with a spindle (14) for connecting tubular workpieces, with a fork-like receiver (3), with a clamping pincer (4) exchangeably held in this receiver by way of a connection bolt (5) and with a controlled electric drive motor (10) for actuating the clamping pincer, wherein there is present a spindle (14) which is driven by the electric drive motor (10) via a reduction gear (11) and which is in active connection with the clamping pincer (4), and wherein the spindle (14) is connected to the gear (11) via a shaft (13), wherein the shaft (13) passes through at least one radial bearing (19) and an axial thrust bearing (18) supported on the housing (21) of the pressing tool, and wherein between the thrust bearing (18) and the support on the housing (20, 21) there is arranged a force or pressure sensor (25) which on reaching a predefined nominal value of the clamping force emits a switching signal (S) to the control (22) of the drive motor (10).
  2. A pressing tool according to claim 1, wherein the spindle (14) and the shaft (13) are connected flush to one another as one piece.
  3. A pressing tool according to claim 1, wherein the threaded spindle (14) is a screw spindle with a trapezoid thread and engages into an axially displaceably mounted spindle nut which acts on the clamping pincer (4) via a roller advance element (15).
  4. A pressing tool according to claim 2, wherein on the shaft (13) in the region close to the spindle there is integrally formed a pressure flange (17) and the shaft (13) passes through a housing plate (20), wherein between the pressure flange (17) and the housing plate (20) lies the thrust bearing (18) which on the one side is supported on the pressure flange (17) and on the other side via a force or pressure sensor (25) on the housing plate (20).
  5. A pressing tool according to claim 4, wherein the force or pressure sensor (25) is a cylindrical element surrounding the shaft.
  6. A pressing tool according to claim 4, wherein the force or pressure sensor (25) is arranged between the housing plate (20) and a lever (26).
  7. A pressing tool according to claim 6, wherein the force or pressure sensor (25) is a piezoelectric sensor.
  8. A pressing tool according to claim 1, wherein the threaded spindle (14) is a circulating ball spindle.
  9. A pressing tool according to claim 1, wherein the force or pressure sensor (25) is a wire strain gauge.
EP02732298A 2001-06-19 2002-06-04 Press tool comprising a spindle for moulding coupling elements Expired - Lifetime EP1397231B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH111401 2001-06-19
CH11142001 2001-06-19
PCT/CH2002/000291 WO2002102555A1 (en) 2001-06-19 2002-06-04 Press tool comprising a spindle for moulding coupling elements

Publications (2)

Publication Number Publication Date
EP1397231A1 EP1397231A1 (en) 2004-03-17
EP1397231B1 true EP1397231B1 (en) 2007-03-21

Family

ID=4558273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02732298A Expired - Lifetime EP1397231B1 (en) 2001-06-19 2002-06-04 Press tool comprising a spindle for moulding coupling elements

Country Status (7)

Country Link
US (1) US7036806B2 (en)
EP (1) EP1397231B1 (en)
CN (1) CN1262395C (en)
AT (1) ATE357313T1 (en)
DE (1) DE50209777D1 (en)
ES (1) ES2283556T3 (en)
WO (1) WO2002102555A1 (en)

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EP2286936A1 (en) 2009-08-11 2011-02-23 Geberit International AG Pressing tool

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Also Published As

Publication number Publication date
CN1262395C (en) 2006-07-05
WO2002102555A1 (en) 2002-12-27
ATE357313T1 (en) 2007-04-15
CN1516638A (en) 2004-07-28
ES2283556T3 (en) 2007-11-01
EP1397231A1 (en) 2004-03-17
US7036806B2 (en) 2006-05-02
US20040144146A1 (en) 2004-07-29
DE50209777D1 (en) 2007-05-03

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