EP1163409A1 - Poker vibrator with frequency converter - Google Patents

Poker vibrator with frequency converter

Info

Publication number
EP1163409A1
EP1163409A1 EP00912496A EP00912496A EP1163409A1 EP 1163409 A1 EP1163409 A1 EP 1163409A1 EP 00912496 A EP00912496 A EP 00912496A EP 00912496 A EP00912496 A EP 00912496A EP 1163409 A1 EP1163409 A1 EP 1163409A1
Authority
EP
European Patent Office
Prior art keywords
housing
switch
frequency converter
internal vibrator
electric motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00912496A
Other languages
German (de)
French (fr)
Other versions
EP1163409B1 (en
Inventor
Michael Steffen
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.)
Wacker Construction Equipment AG
Original Assignee
Wacker Werke GmbH and Co KG
Wacker Construction Equipment 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 Wacker Werke GmbH and Co KG, Wacker Construction Equipment AG filed Critical Wacker Werke GmbH and Co KG
Publication of EP1163409A1 publication Critical patent/EP1163409A1/en
Application granted granted Critical
Publication of EP1163409B1 publication Critical patent/EP1163409B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
    • B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
    • E04G21/08—Internal vibrators, e.g. needle vibrators

Definitions

  • the invention relates to an internal vibrator according to the preamble of patent claim 1.
  • Internal vibrators of this type are used to compact fresh concrete, a vibrating body or housing being attached to a protective hose, in which an unbalance is driven in rotation by an electric motor.
  • the motor To generate a compression frequency suitable for fresh concrete, the motor must rotate at a very high speed, for example 12,000 min, which requires an electrical frequency that is higher than the usual mains frequency.
  • a frequency converter is connected upstream of the electric motor, which increases the mains frequency from 50 Hertz to 200 Hertz, for example.
  • the switch housing had to be enlarged somewhat, which can be disadvantageous for its slippage and off-road capability on the construction site.
  • the somewhat enlarged switch housing gets caught on concrete reinforcements.
  • the switch housing with the integrated frequency converter has a not insignificant weight, so that the constant pulling of the switch housing it can be difficult at work.
  • the invention is based on the object of specifying an internal vibrator which is even easier to handle in practice and in which in particular the ability to slip is improved and the weight to be moved by the operator is reduced.
  • An internal vibrator according to the invention is characterized in that at least some of the components of the frequency converter are arranged in the vibrating housing, the plug housing or the protective hose. Essentially four embodiments are covered:
  • the components of the frequency converter are installed at various locations on the internal vibrator.
  • the frequency converter is no longer integrated into the switch housing, which has the advantage that, due to its low weight and small dimensions, it is again very light and "slippery", ie capable of slipping.
  • the switch housing can be easily pulled behind when working on the operating hose.
  • the arrangement of components of the frequency converter at certain points in the internal vibrator offers the possibility of installing the components in a targeted manner where they can be accommodated particularly expediently. It is particularly advantageous if a power unit that generates a lot of heat during operation is accommodated in the vibrating housing which is immersed in the concrete slurry, because this enables particularly effective cooling.
  • the switch is arranged in its own switch housing.
  • the switch can also be integrated in the connector housing, in the protective tube or in the vibrating housing.
  • the independent claim 11 defines an embodiment in which the frequency converter and the switch are also housed in different housings, namely here in a coupling piece and in a switch housing. This also enables an optimization of the weight distribution on the internal vibrator and a shape for better off-road mobility. This can go so far that the switch is integrated into the connector housing, while the frequency converter is arranged in the coupling piece between the protective hose and the electrical cable.
  • Another variant of the invention is defined in independent claim 13, according to which at least some of the components of the frequency converter are arranged in a converter housing provided between the switch housing and the power plug. This also allows the weight distribution and external shape of the internal vibrator to be optimized.
  • An electric motor (not shown) is housed in a vibrating housing 1, also referred to as a vibrating bottle, which drives an imbalance serving as a vibration generator in a rotating manner at high speed.
  • a vibrating housing 1 which is to be immersed in the still liquid concrete is set into vibrations, as a result of which the desired compacting effect in the concrete can be achieved.
  • the vibrator housing 1 is attached on one side to a protective tube 2, which can be up to several meters (for example 6 meters) and is held in operation by the operator. Therefore, the protective tube 2 also serves as an operating tube.
  • a switch housing 3 which is also referred to as a switchgear and is used here as a coupling piece, is mounted, which carries a switch 4.
  • electrical leads 5 to the electric motor in the vibrating housing 1 can be interrupted or closed in a known manner.
  • the electrical supply lines 5 run inside the protective tube 2.
  • a rubber grommet 6 extends from the other side of the switch housing 3, inside which an electrical cable 7 runs, which finally ends at a switch housing 9 carrying a plug 8.
  • the function of the coupling piece (here: switch housing 3) is to couple the stable protective hose 2 to the electrical cable 7.
  • the electric motor must rotate at a very high speed and therefore requires an electrical frequency which is above the mains frequency for its operation.
  • Frequencies in the range of 200 Hertz are usual, which corresponds to four times the mains frequency.
  • all components of the electronic hybrid frequency converter are mers integrated in the vibrator housing 1 and attached directly to the electric motor.
  • the mains current is fed to the vibrating housing 1 via the plug 8, the electrical cable 7, the switch 4 and the electrical feed lines 5.
  • the electrical cable 7 and the electrical supply lines 5 form an electrical supply between the connector 8 and the electric motor.
  • This embodiment has the advantage that the switch housing 3 takes on a very small, handy and slip-resistant shape, so that the operator can easily move it past the reinforcements during operation of the internal vibrator. Furthermore, the heat sink volume of the electronic frequency converter can be considerably reduced, since the vibrating housing 1, which is made of metal, dissipates heat from the frequency converter and passes it on to the concrete slurry, which ensures very efficient cooling. Furthermore, the protective tube 2 no longer has to be shielded, since it only supplies mains current. Finally, the winding temperature of the motor can be detected by means of a temperature sensor and read back as an operating variable. If a corresponding control is provided, the frequency converter can be controlled depending on the temperature.
  • the frequency converter is completely integrated into the connector housing 9 carrying the connector 8.
  • This variant requires an enlargement of the connector housing 9 compared to conventional connector housings, which, however, does not lead to disadvantages for the operation of the internal vibrator, since the connector 8 is usually inserted into a stationary cable drum or socket. Therefore, the operator rarely has to lift and move the connector housing 9 with the integrated frequency converter while the internal vibrator is operating.
  • the vibrator housing 1 and the switch housing 3 are not changed. Since the increased frequency is now available from the connector housing 9, the electrical cable 7 and the electrical supply lines 5 in the protective tube 2 must be shielded. Since the frequency converter in the connector housing 9 is essentially cooled by air, this embodiment is advantageously suitable for small internal vibrators with low power consumption.
  • the integration of the frequency converter in the connector housing 9 - for example by integration with a residual current circuit breaker (FI-DI switch) - enables a particularly high level of operating safety.
  • FI-DI switch residual current circuit breaker
  • the components of the frequency converter are distributed according to their best suitability in the internal vibrator if the frequency converter consists of several components.
  • a power unit and a processor of the frequency converter are installed in the vibrator housing 1, where optimal cooling by the concrete slurry and the vibrator housing 1 serving as a heat sink is possible.
  • a rectifier and a switching power supply of the frequency converter are integrated in the connector housing 9.
  • Capacitors that may be required, in particular direct current intermediate circuit capacitors, can be integrated into the protective hose 2 of the internal vibrator.
  • a construction of this type enables a minimal construction volume and thus also a minimal weight of the internal vibrator.
  • the switch housing 3, which still only carries the switch 4, remains small and all-terrain. Due to the cooling effect of the vibrating bottle 1, additional cooling body volumes can be dispensed with. Due to the generation of the higher frequency in the vibrating housing 1 itself, the protective tube 2 and the electrical cable 7 do not have to be shielded.
  • a fourth embodiment of the invention is characterized in that the frequency converter is arranged in the coupling piece coupling the protective tube and the electrical cable, but the switch housing receiving the switch is arranged separately from the coupling piece.
  • This variant enables numerous design variants to optimize weight distribution and off-road capability.
  • the fourth embodiment is further developed such that the switch housing is integrated in the connector housing 9.
  • a sixth embodiment is characterized in that at least some of the components of the frequency converter are arranged in a converter housing provided between the switch housing and the power plug. This also spatially separates the frequency converter and the switch housing in order to maintain the advantageous design options.
  • the variants described are also suitable for internal vibrators with a short protective hose, for example stick or hand-held vibrators.
  • the operation is not carried out via the protective tube, but by means of a handle which is combined, for example, with the switch housing 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

The invention relates to a poker vibrator for compressing concrete. The poker vibrator comprises a vibrating housing (1) that accommodates an unbalanced mass and an electromotor, an insulating plastic tube (2) that links the vibrating housing (1) to a switch cover (3), an electric cable (7) that links the switch cover (3) to a connector shell (9) and a frequency converter that supplies the current for the electromotor. The poker vibrator is characterised in that at least parts of the components pertaining to the poker vibrator are arranged in the vibrating housing (1), the insulating plastic tube (2) or the connector shell (9).

Description

Innenrüttler mit Frequenzumformer Internal vibrator with frequency converter
Die Erfindung betrifft einen Innenrüttler gemäß dem Oberbegriff von Patentanspruch 1.The invention relates to an internal vibrator according to the preamble of patent claim 1.
Derartige Innenrüttler dienen zum Verdichten von Frischbeton, wobei an einem Schutzschlauch ein Rüttelkörper bzw. -gehäuse angebracht ist, in dem eine Unwucht durch einen Elektromotor drehend angetrieben wird. Zur Erzeugung einer für den Frischbeton geeigneten Verdichtungsfrequenz muß der Motor mit sehr hoher Drehzahl, zum Beispiel 12.000 min , drehen, was eine gegenüber der üblichen Netzfrequenz erhöhte elektrische Frequenz erfordert. Zur Bereitstellung der erhöhten elektrischen Frequenz ist dem Elektromotor ein Frequenzumformer vorgeschaltet, der die Netzfrequenz von 50 Hertz zum Beispiel auf 200 Hertz erhöht.Internal vibrators of this type are used to compact fresh concrete, a vibrating body or housing being attached to a protective hose, in which an unbalance is driven in rotation by an electric motor. To generate a compression frequency suitable for fresh concrete, the motor must rotate at a very high speed, for example 12,000 min, which requires an electrical frequency that is higher than the usual mains frequency. To provide the increased electrical frequency, a frequency converter is connected upstream of the electric motor, which increases the mains frequency from 50 Hertz to 200 Hertz, for example.
Es sind Innenrüttler bekannt, bei denen der Schutzschlauch gleichzeitig als Bedienungsschlauch ausgebildet ist und eine Länge von mehreren Metern aufweist. An dem dem Rüttelgehäuse gegenüber liegenden Ende des Schutzschlauches ist ein Schaltergehäuse befestigt, welches einen Netzschalter trägt. Von dem Schaltergehäuse geht ein Elektrokabel zu einem Stecker, der in einen konventionellen Frequenzumrichter einsteckbar ist. Die sich durch den sehr sperrigen und schwer zu handhabenden separaten Frequenzumrichter ergebenden Nachteile für den Betrieb eines derartigen Innenrüttlers haben zu der Entwicklung eines Innenrüttlers geführt, bei dem der Frequen- zumformer mit dem Schalter zu einem miniaturisierten Schaltergehäuse zusammengefaßt ist. Ein derartiger Innenrüttler wird in der EP 0 604 723 beschrieben und hat sich in der Praxis hervorragend bewährt. Insbesondere durch den Wegfall des separaten Frequenzumformers läßt sich das Gerät im Betrieb sehr einfach handhaben.Internal vibrators are known in which the protective hose is simultaneously designed as an operating hose and has a length of several meters. A switch housing, which carries a power switch, is fastened to the end of the protective tube opposite the vibrating housing. An electrical cable goes from the switch housing to a plug that can be plugged into a conventional frequency converter. The disadvantages for the operation of such an internal vibrator which result from the very bulky and difficult to handle separate frequency converter have led to the development of an internal vibrator in which the frequency converter is combined with the switch to form a miniaturized switch housing. Such an internal vibrator is described in EP 0 604 723 and has proven itself extremely well in practice. In particular, by eliminating the separate frequency converter, the device can be handled very easily during operation.
Jedoch mußte für die Integration des Frequenzumformers in das Schaltergehäuse zwangsläufig das Schaltergehäuse etwas vergrößert werden, was für seine Schlupffähigkeit und Geländegängigkeit auf der Baustelle nachteilig sein kann. Insbesondere besteht die Möglichkeit, daß das etwas vergrößerte Schaltergehäuse an Betonarmierungen hängen bleibt. Außerdem weist das Schaltergehäuse mit dem integrierten Frequenzumformer ein nicht unerhebliches Gewicht auf, so daß das ständige Hinterherziehen des Schaltergehäu- ses bei der Arbeit beschwerlich sein kann.However, for the integration of the frequency converter into the switch housing, the switch housing had to be enlarged somewhat, which can be disadvantageous for its slippage and off-road capability on the construction site. In particular, there is the possibility that the somewhat enlarged switch housing gets caught on concrete reinforcements. In addition, the switch housing with the integrated frequency converter has a not insignificant weight, so that the constant pulling of the switch housing it can be difficult at work.
Der Erfindung liegt die Aufgabe zugrunde, einen Innenrüttler anzugeben, der in der Praxis noch besser handhabbar ist und bei dem insbesondere die Schlupffähigkeit verbessert und das vom Bediener zu bewegende Gewicht verringert ist.The invention is based on the object of specifying an internal vibrator which is even easier to handle in practice and in which in particular the ability to slip is improved and the weight to be moved by the operator is reduced.
Die erfindungsgemäße Lösung wird in den Patentansprüchen 1 , 1 1 und 13 angegeben. Vorteilhafte Weiterentwicklungen der Erfindung sind den ab- hängigen Ansprüchen zu entnehmen.The solution according to the invention is specified in claims 1, 1 1 and 13. Advantageous further developments of the invention can be found in the dependent claims.
Ein erfindungsgemäßer Innenrüttler ist gemäß Patentanspruch 1 dadurch gekennzeichnet, daß wenigstens ein Teil der Bauelemente des Frequenzumformers in dem Rüttelgehäuse, dem Steckergehäuse oder dem Schutz - schlauch angeordnet ist. Davon werden im wesentlichen vier Ausführungsformen erfaßt:An internal vibrator according to the invention is characterized in that at least some of the components of the frequency converter are arranged in the vibrating housing, the plug housing or the protective hose. Essentially four embodiments are covered:
- sämtliche Bauelemente des Frequenzumformers sind in dem Rüttelgehäuse integriert; - sämtliche Bauelemente des Frequenzumformers sind in dem Stekkergehäuse integriert;- All components of the frequency converter are integrated in the vibrating housing; - All components of the frequency converter are integrated in the connector housing;
- sämtliche Bauelemente des Frequenzumformers sind in dem Schutzschlauch integriert; oder- All components of the frequency converter are integrated in the protective tube; or
- die Bauelemente des Frequenzumformers sind an verschiedenen Or- ten des Innenrüttlers eingebaut.- The components of the frequency converter are installed at various locations on the internal vibrator.
Daraus ergeben sich für den Aufbau und für die Bedienung des Innenrüttlers zahlreiche Vorteile, die später noch bei der Beschreibung der Ausführungsformen detaillierter erläutert werden. Wesentliches Merkmal ist, daß der Frequenzumformer nicht mehr in das Schaltergehäuse integriert wird, woraus sich der Vorteil ergibt, daß dieses aufgrund seines geringen Gewichtes und seiner geringen Abmessungen wieder sehr leicht und "schlüpfrig", d.h. schlupffähig wird. Für den Betrieb des Innenrüttlers ergibt sich damit der Vorteil, daß das Schaltergehäuse bei der Arbeit an dem Bedienungs- schlauch leicht hinterhergezogen werden kann. Die Anordnung von Bauelementen des Frequenzumformers an bestimmten Stellen im Innenrüttler bietet andererseits die Möglichkeit, die Komponenten zielgerichtet dort einzubauen, wo sie besonders zweckmäßig untergebracht werden können. So ist es insbesondere sehr vorteilhaft, wenn ein im Betrieb viel Wärme erzeugendes Leistungsteil in dem in die Betonschlempe eintauchenden Rüttelgehäuse untergebracht ist, weil dadurch eine besonders effektive Kühlung möglich ist.This results in numerous advantages for the construction and for the operation of the internal vibrator, which will be explained in more detail later in the description of the embodiments. An essential feature is that the frequency converter is no longer integrated into the switch housing, which has the advantage that, due to its low weight and small dimensions, it is again very light and "slippery", ie capable of slipping. For the operation of the internal vibrator, this has the advantage that the switch housing can be easily pulled behind when working on the operating hose. The arrangement of components of the frequency converter at certain points in the internal vibrator, on the other hand, offers the possibility of installing the components in a targeted manner where they can be accommodated particularly expediently. It is particularly advantageous if a power unit that generates a lot of heat during operation is accommodated in the vibrating housing which is immersed in the concrete slurry, because this enables particularly effective cooling.
Es ist für eine Variante der Erfindung nicht erforderlich, daß der Schalter in einem eigenen Schaltergehäuse angeordnet ist. Der Schalter kann auch in dem Steckergehäuse, im Schutzschlauch oder in dem Rüttelgehäuse integriert sein.It is not necessary for a variant of the invention that the switch is arranged in its own switch housing. The switch can also be integrated in the connector housing, in the protective tube or in the vibrating housing.
Der unabhängige Patentanspruch 11 definiert eine Ausführungsform, bei der ebenfalls der Frequenzumformer und der Schalter in verschiedenen Gehäusen, nämlich hier in einem Kopplungsstück und in einem Schaltergehäuse untergebracht sind. Dies ermöglicht ebenfalls eine Optimierung der Gewichtsverteilung am Innenrüttler und eine Formgebung zur besseren Geländegängigkeit. Dies kann soweit gehen, daß der Schalter in das Stek- kergehäuse integriert wird, während der Frequenzumformer in dem Kopplungsstück zwischen Schutzschlauch und Elektrokabel angeordnet wird.The independent claim 11 defines an embodiment in which the frequency converter and the switch are also housed in different housings, namely here in a coupling piece and in a switch housing. This also enables an optimization of the weight distribution on the internal vibrator and a shape for better off-road mobility. This can go so far that the switch is integrated into the connector housing, while the frequency converter is arranged in the coupling piece between the protective hose and the electrical cable.
Eine andere Variante der Erfindung ist in dem unabhängigen Patentanspruch 13 definiert, wonach wenigstens ein Teil der Bauelemente des Fre- quenzumformers in einem zwischen dem Schaltergehäuse und dem Netzstecker vorgesehenen Umformergehäuse angeordnet ist. Auch hierdurch lassen sich Gewichtsverteilung und äußere Formgebung des Innenrüttlers optimieren.Another variant of the invention is defined in independent claim 13, according to which at least some of the components of the frequency converter are arranged in a converter housing provided between the switch housing and the power plug. This also allows the weight distribution and external shape of the internal vibrator to be optimized.
Diese und weitere Vorteile und Merkmale werden nachfolgend anhand von Beispielen unter Zuhilfenahme der begleitenden Figur näher erläutert. Die einzige Figur zeigt einen erfindungsgemäßen Innenrüttler in Perspektivansicht.These and other advantages and features are explained in more detail below using examples with the aid of the accompanying figure. The single figure shows an internal vibrator according to the invention in perspective view.
In einem auch als Rüttelflasche bezeichneten Rüttelgehäuse 1 ist ein nicht dargestellter Elektromotor untergebracht, der eine als Schwingungserzeu- gungseinrichtung dienende Unwucht drehend mit hoher Drehzahl antreibt. Dadurch wird das in den noch flüssigen Beton einzutauchende Rüttelgehäuse 1 in Schwingungen versetzt, wodurch die gewünschte Verdichtungswirkung im Beton erzielt werden kann.An electric motor (not shown) is housed in a vibrating housing 1, also referred to as a vibrating bottle, which drives an imbalance serving as a vibration generator in a rotating manner at high speed. As a result, the vibrating housing 1 which is to be immersed in the still liquid concrete is set into vibrations, as a result of which the desired compacting effect in the concrete can be achieved.
Das Rüttelgehäuse 1 ist an einer Seite an einem Schutzschlauch 2 befestigt, der bis zu mehreren Metern (zum Beispiel 6 Meter) sein kann und im Betrieb vom Bediener gehalten wird. Daher dient der Schutzschlauch 2 auch als Bedienungsschlauch.The vibrator housing 1 is attached on one side to a protective tube 2, which can be up to several meters (for example 6 meters) and is held in operation by the operator. Therefore, the protective tube 2 also serves as an operating tube.
Am anderen Ende des Schutzschlauches 2 ist ein auch als Schalterei bezeichnetes und hier als Kopplungsstück dienendes Schaltergehäuse 3 angebracht, das einen Schalter 4 trägt. Über den Schalter 4 können in bekannter Weise elektrische Zuleitungen 5 zu dem Elektromotor im Rüttelgehäuse 1 unterbrochen bzw. geschlossen werden. Die elektrischen Zuleitungen 5 ver- laufen im Inneren des Schutzschlauches 2.At the other end of the protective tube 2, a switch housing 3, which is also referred to as a switchgear and is used here as a coupling piece, is mounted, which carries a switch 4. Using the switch 4, electrical leads 5 to the electric motor in the vibrating housing 1 can be interrupted or closed in a known manner. The electrical supply lines 5 run inside the protective tube 2.
Von der anderen Seite des Schaltergehäuses 3 erstreckt sich eine Gummitülle 6, in deren Innerem ein Elektrokabel 7 verläuft, das schließlich an einem einen Stecker 8 tragenden Schaltergehäuse 9 endet. Die Funktion des Kopplungsstückes (hier: Schaltergehäuse 3) besteht darin, den stabilen Schutzschlauch 2 mit dem Elektrokabel 7 zu koppeln.A rubber grommet 6 extends from the other side of the switch housing 3, inside which an electrical cable 7 runs, which finally ends at a switch housing 9 carrying a plug 8. The function of the coupling piece (here: switch housing 3) is to couple the stable protective hose 2 to the electrical cable 7.
Wie bereits ausgeführt, muß der Elektromotor mit sehr hoher Drehzahl drehen und erfordert daher für seinen Betrieb eine elektrische Frequenz, die über der Netzfrequenz liegt. Üblich sind dabei Frequenzen im Bereich von 200 Hertz, was dem Vierfachen der Netzfrequenz entspricht.As already stated, the electric motor must rotate at a very high speed and therefore requires an electrical frequency which is above the mains frequency for its operation. Frequencies in the range of 200 Hertz are usual, which corresponds to four times the mains frequency.
Um die gewünschte Frequenz zu erreichen, ist es aus dem Stand der Technik bekannt, den Netzstrom in einem Frequenzumformer zu wandeln. Dies war zum einen dadurch möglich, daß der Stecker 8 in eine separate Frequenzumformeinrichtung eingesteckt werden konnte. Zum anderen ist es bekannt, daß Schaltergehäuse 3 zu vergrößern und dort neben dem Schalter 4 auch den Frequenzumformer vorzusehen. Beide Ausführungen sind jedoch mit Nachteilen versehen, die durch die Erfindung gelöst werden.In order to achieve the desired frequency, it is known from the prior art to convert the mains current in a frequency converter. This was possible on the one hand by the fact that the plug 8 could be inserted into a separate frequency conversion device. On the other hand, it is known to enlarge the switch housing 3 and to provide the frequency converter there in addition to the switch 4. However, both versions have disadvantages which are solved by the invention.
Bei einer ersten Ausführungsform des erfindungsgemäßen Innenrüttlers werden sämtliche Bauelemente des elektronischen Hybrid-Frequenzumfor- mers in das Rüttelgehäuse 1 integriert und direkt an dem Elektromotor angebaut. Der Netzstrom wird über den Stecker 8, das Elektrokabel 7, den Schalter 4 und die elektrischen Zuleitungen 5 an das Rüttelgehäuse 1 geführt. Das Elektrokabel 7 und die elektrischen Zuleitungen 5 bilden eine Elektrozuführung zwischen dem Stecker 8 und dem Elektromotor.In a first embodiment of the internal vibrator according to the invention, all components of the electronic hybrid frequency converter are mers integrated in the vibrator housing 1 and attached directly to the electric motor. The mains current is fed to the vibrating housing 1 via the plug 8, the electrical cable 7, the switch 4 and the electrical feed lines 5. The electrical cable 7 and the electrical supply lines 5 form an electrical supply between the connector 8 and the electric motor.
Diese Ausführungsform hat den Vorteil, daß das Schaltergehäuse 3 eine sehr kleine, handliche und schlupffähige Form einnimmt, so daß es im Betrieb des Innenrüttlers vom Bediener leicht an den Armierungen vorbeige- führt werden kann. Weiterhin kann das Kühlkörper-Volumen des elektronischen Frequenzumformers erheblich reduziert werden, da das aus Metall bestehende Rüttelgehäuse 1 Wärme von dem Frequenzumformer abführt und an die Betonschlempe weitergibt, was eine sehr effiziente Kühlung gewährleistet. Weiterhin muß der Schutzschlauch 2 nicht mehr abgeschirmt wer- den, da er lediglich Netzstrom zuführt. Schließlich läßt sich die Wicklungstemperatur des Motors mittels eines Temperatursensors erfassen und als Betriebsgröße rücklesen. Bei Bereitstellung einer entsprechenden Regelung kann der Frequenzumformer in Abhängigkeit von der Temperatur angesteuert werden.This embodiment has the advantage that the switch housing 3 takes on a very small, handy and slip-resistant shape, so that the operator can easily move it past the reinforcements during operation of the internal vibrator. Furthermore, the heat sink volume of the electronic frequency converter can be considerably reduced, since the vibrating housing 1, which is made of metal, dissipates heat from the frequency converter and passes it on to the concrete slurry, which ensures very efficient cooling. Furthermore, the protective tube 2 no longer has to be shielded, since it only supplies mains current. Finally, the winding temperature of the motor can be detected by means of a temperature sensor and read back as an operating variable. If a corresponding control is provided, the frequency converter can be controlled depending on the temperature.
Bei einer zweiten Ausführungsform der Erfindung wird der Frequenzumformer vollständig in das den Stecker 8 tragende Steckergehäuse 9 integriert.In a second embodiment of the invention, the frequency converter is completely integrated into the connector housing 9 carrying the connector 8.
Diese Variante erfordert eine Vergrößerung des Steckergehäuses 9 gegen- über üblichen Steckergehäusen, was jedoch nicht zu Nachteilen für den Betrieb des Innenrüttlers führt, da der Stecker 8 meist in eine ortsfeste Kabeltrommel bzw. Steckdose eingesteckt wird. Daher muß der Bediener im Betrieb des Innenrüttlers das Steckergehäuse 9 mit dem integrierten Frequenzumformer nur selten anheben und bewegen.This variant requires an enlargement of the connector housing 9 compared to conventional connector housings, which, however, does not lead to disadvantages for the operation of the internal vibrator, since the connector 8 is usually inserted into a stationary cable drum or socket. Therefore, the operator rarely has to lift and move the connector housing 9 with the integrated frequency converter while the internal vibrator is operating.
Das Rüttelgehäuse 1 und das Schaltergehäuse 3 werden dabei nicht verändert. Da nunmehr die erhöhte Frequenz bereits ab dem Steckergehäuse 9 vorliegt, sind das Elektrokabel 7 und die elektrischen Zuleitungen 5 im Schutzschlauch 2 abzuschirmen. Da die Kühlung des Frequenzumformers im Steckergehäuse 9 im wesentlichen durch Luft erfolgt, eignet sich diese Ausführungsform vorteilhafterweise für kleine Innenrüttler mit kleiner Leistungsaufnahme. Die Integration des Frequenzumformers in das Steckergehäuse 9 - zum Beispiel durch Integration mit einem Fehlerstromschutzschalter (FI-DI-Schal- ter) - ermöglicht eine besonders hohe Bediensicherheit. Zudem ist es möglich, das Rüttelgehäuse 1 mit dem Elektromotor, den Frequenzumformer, den Schutzschlauch 2 und das Elektrokabel 7 durch eine geeignete Elektronik am Frequenzumformer auf Kurzschluß, Erdschluß und Fehlerstrom zu überwachen und damit zu schützen. Bei Beschädigungen des Schutzschlauches 2 mit den Zuleitungen 5 oder des Elektrokabels 7 unterbricht die Stromzufuhr für den Innenrüttler sofort.The vibrator housing 1 and the switch housing 3 are not changed. Since the increased frequency is now available from the connector housing 9, the electrical cable 7 and the electrical supply lines 5 in the protective tube 2 must be shielded. Since the frequency converter in the connector housing 9 is essentially cooled by air, this embodiment is advantageously suitable for small internal vibrators with low power consumption. The integration of the frequency converter in the connector housing 9 - for example by integration with a residual current circuit breaker (FI-DI switch) - enables a particularly high level of operating safety. In addition, it is possible to monitor the vibrator housing 1 with the electric motor, the frequency converter, the protective tube 2 and the electrical cable 7 by means of suitable electronics on the frequency converter for short-circuit, earth fault and fault current and thus to protect them. If the protective hose 2 with the supply lines 5 or the electrical cable 7 is damaged, the power supply for the internal vibrator is interrupted immediately.
Bei der dritten Ausführungsform der Erfindung werden die Bauelemente des Frequenzumformers entsprechend ihrer besten Eignung in dem Innenrüttler verteilt, wenn der Frequenzumformer aus mehreren Bauelementen besteht. Das bedeutet, daß ein Leistungsteil und ein Prozessor des Frequenzumfor- mers in dem Rüttelgehäuse 1 eingebaut werden, wo eine optimale Kühlung durch die Betonschlempe und das als Kühlkörper dienende Rüttelgehäuse 1 möglich ist. Ein Gleichrichter und ein Schaltnetzteil des Frequenzumformers werden in das Steckergehäuse 9 integriert. Eventuell erforderliche Kondensatoren, insbesondere Gleichstrom-Zwischenkreis-Kondensatoren lassen sich in den Schutzschlauch 2 des Innenrüttlers integrieren.In the third embodiment of the invention, the components of the frequency converter are distributed according to their best suitability in the internal vibrator if the frequency converter consists of several components. This means that a power unit and a processor of the frequency converter are installed in the vibrator housing 1, where optimal cooling by the concrete slurry and the vibrator housing 1 serving as a heat sink is possible. A rectifier and a switching power supply of the frequency converter are integrated in the connector housing 9. Capacitors that may be required, in particular direct current intermediate circuit capacitors, can be integrated into the protective hose 2 of the internal vibrator.
Eine derart aufgelöste Bauweise ermöglicht ein minimales Bauvolumen und damit auch minimales Gewicht des Innenrüttlers. Das Schaltergehäuse 3, das nach wie vor nur den Schalter 4 trägt, bleibt klein und geländegängig. Durch die Kühlwirkung der Rüttelflasche 1 kann auf zusätzliche Kühlkörper-Volumina verzichtet werden. Durch die Erzeugung der höheren Frequenz im Rüttelgehäuse 1 selbst müssen der Schutzschlauch 2 und das Elektrokabel 7 nicht abgeschirmt werden.A construction of this type enables a minimal construction volume and thus also a minimal weight of the internal vibrator. The switch housing 3, which still only carries the switch 4, remains small and all-terrain. Due to the cooling effect of the vibrating bottle 1, additional cooling body volumes can be dispensed with. Due to the generation of the higher frequency in the vibrating housing 1 itself, the protective tube 2 and the electrical cable 7 do not have to be shielded.
Eine nicht dargestellte vierte Ausführungsform der Erfindung ist dadurch gekennzeichnet, daß der Frequenzumformer zwar in das den Schutzschlauch und das Elektrokabel koppelnden Kopplungsstück angeordnet ist, jedoch das den Schalter aufnehmende Schaltergehäuse von dem Kopplungsstück getrennt angeordnet ist. Diese Variante ermöglicht zahlreiche Gestaltungs- Varianten zur Optimierung von Gewichtsverteilung und Geländegängigkeit. Bei einer nicht dargestellten fünften Ausführungsform der Erfindung ist die vierte Ausführungsform derart weiterentwickelt, daß das Schaltergehäuse in das Steckergehäuse 9 integriert ist.A fourth embodiment of the invention, not shown, is characterized in that the frequency converter is arranged in the coupling piece coupling the protective tube and the electrical cable, but the switch housing receiving the switch is arranged separately from the coupling piece. This variant enables numerous design variants to optimize weight distribution and off-road capability. In a fifth embodiment of the invention, not shown, the fourth embodiment is further developed such that the switch housing is integrated in the connector housing 9.
Eine ebenfalls in der Figur nicht dargestellte sechste Ausführungsform ist dadurch gekennzeichnet, daß wenigstens ein Teil der Bauelemente des Frequenzumformers in einem zwischen dem Schaltergehäuse und dem Netzstecker vorgesehenen Umformergehäuse angeordnet ist. Auch dadurch werden der Frequenzumformer und das Schaltergehäuse räumlich voneinan- der getrennt, um die vorteilhaften Gestaltungsmöglichkeiten zu erhalten.A sixth embodiment, also not shown in the figure, is characterized in that at least some of the components of the frequency converter are arranged in a converter housing provided between the switch housing and the power plug. This also spatially separates the frequency converter and the switch housing in order to maintain the advantageous design options.
Die beschriebenen Varianten eignen sich auch für Innenrüttler mit kurzem Schutzschlauch, zum Beispiel Stab- oder Handstockrüttler. Bei derartigen Rüttlern erfolgt die Bedienung nicht über den Schutzschlauch, sondern mit- tels eines Handgriffes, der zum Beispiel mit dem Schaltergehäuse 3 zusammengefaßt ist.The variants described are also suitable for internal vibrators with a short protective hose, for example stick or hand-held vibrators. In the case of such vibrators, the operation is not carried out via the protective tube, but by means of a handle which is combined, for example, with the switch housing 3.
Weitere Varianten für die Anwendung der Erfindung sind möglich, indem der Schalter in den Schutzschlauch integriert wird. Ebenfalls kann auf das am Ende des Schutzschlauches 2 befestigte Kopplungsstück verzichtet werden, wenn dort nicht ein Schalter oder ein Frequenzumformer untergebracht werden muß. Statt dessen kann das Ende des Schutzschlauches 2 in einer der Gummitülle 6 ähnlichen Tülle auslaufen und in das Elektrokabel 7 münden. Ebenfalls ist es möglich, das Ende des Schutzschlauches 2 derart zu vulka- nisieren, daß es in das Elektrokabel 7 übergeht. Bei gleichzeitiger Integration des Schalters und des Frequenzumformers in das Steckergehäuse 9, den Schutzschlauch 2 oder das Rüttelgehäuse 1 wird ein Innenrüttler mit glatten Außenkonturen ohne Ausbuchtungen geschaffen, der dementsprechend eine ausgezeichnete Schlupffähigkeit aufweist. Further variants for the application of the invention are possible by integrating the switch in the protective tube. It is also possible to dispense with the coupling piece attached to the end of the protective tube 2 if a switch or a frequency converter does not have to be accommodated there. Instead, the end of the protective tube 2 can run out in a grommet similar to the grommet 6 and open into the electric cable 7. It is also possible to vulcanize the end of the protective tube 2 in such a way that it merges into the electrical cable 7. With simultaneous integration of the switch and the frequency converter into the connector housing 9, the protective tube 2 or the vibrating housing 1, an internal vibrator with smooth outer contours without bulges is created, which accordingly has excellent slip ability.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Innenrüttler zum Verdichten von Beton, mit einem eine Schwingungserzeugungseinrichtung und einen die Schwin- gungserzeugungseinrichtung antreibenden Elektromotor aufnehmenden Rüttelgehäuse (1); einem an dem Rüttelgehäuse (1) mit einem Ende befestigten und wenigstens einen Teil einer Elektrozuführung (5, 7) aufnehmenden Schutzschlauch (2); - einem mit der Elektrozuführung (5, 7) gekoppelten Netzstecker (8) mit einem Steckergehäuse (9); und mit einem den Elektromotor speisenden, über die Elektrozuführung (5, 7) mit dem Netzstecker (8) elektrisch koppelbaren und aus einem oder mehreren Bauelementen bestehenden Frequenzumformer zum Erzeugen einer elek- trischen Frequenz, die von einer Netzfrequenz abweicht; dadurch gekennzeichnet, daß wenigstens ein Teil der Bauelemente des Frequenzumformers in dem Rüttelgehäuse (1), dem Steckergehäuse (9) oder dem Schutzschlauch (2) angeordnet ist.1. internal vibrator for compacting concrete, with a vibrating housing (1) receiving an oscillation generating device and an electric motor driving the oscillation generating device; a protective hose (2) fastened at one end to the vibrating housing (1) and receiving at least part of an electrical feed (5, 7); - A mains plug (8) coupled to the electrical feed (5, 7) with a plug housing (9); and with a frequency converter which feeds the electric motor and which can be electrically coupled via the electrical feed (5, 7) to the mains plug (8) and consists of one or more components for generating an electrical frequency which deviates from a mains frequency; characterized in that at least some of the components of the frequency converter are arranged in the vibrating housing (1), the plug housing (9) or the protective tube (2).
2. Innenrüttler nach Anspruch 1 , dadurch gekennzeichnet, daß der Schutzschlauch (2) als Bedienungsschlauch ausgebildet ist.2. Internal vibrator according to claim 1, characterized in that the protective hose (2) is designed as an operating hose.
3. Innenrüttler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in der Elektrozuführung (5, 7) vom Netzstecker (8) bis zum Elektromotor ein Schalter (4) angeordnet ist.3. Internal vibrator according to claim 1 or 2, characterized in that a switch (4) is arranged in the electrical feed (5, 7) from the mains plug (8) to the electric motor.
4. Innenrüttler nach Anspruch 3, dadurch gekennzeichnet, daß der Schalter (4) in einem Schaltergehäuse (3) angeordnet ist.4. Internal vibrator according to claim 3, characterized in that the switch (4) is arranged in a switch housing (3).
5. Innenrüttler nach Anspruch 4, dadurch gekennzeichnet, daß das Schaltergehäuse (3) mit einem Bedienungshandgriff versehen ist.5. Internal vibrator according to claim 4, characterized in that the switch housing (3) is provided with an operating handle.
6. Innenrüttler nach Anspruch 3, dadurch gekennzeichnet, daß der Schalter in dem Steckergehäuse (9) vorgesehen ist.6. Internal vibrator according to claim 3, characterized in that the switch is provided in the connector housing (9).
7. Innenrüttler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Frequenzumformer vollständig in dem Rüttelgehäuse (1) angeordnet ist. 7. Internal vibrator according to claim 1 or 2, characterized in that the frequency converter is arranged completely in the vibrating housing (1).
8. Innenrüttler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Frequenzumformer vollständig in dem Steckergehäuse (9) angeordnet ist.8. Internal vibrator according to claim 1 or 2, characterized in that the frequency converter is arranged completely in the connector housing (9).
9. Innenrüttler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Frequenzumformer vollständig in dem Schutzschlauch (2) angeordnet ist.9. Internal vibrator according to claim 1 or 2, characterized in that the frequency converter is arranged completely in the protective tube (2).
10. Innenrüttler nach einem der vorstehenden Ansprüche, dadurch ge- kennzeichnet, daß zu den Bauelementen des Frequenzumformers wenigstens ein Bauelement aus der Gruppe Schaltnetzteil, Gleichrichter, Gleichstromkondensator, Leistungsteil, Prozessor und Kühleinrichtung gehört.10. Internal vibrator according to one of the preceding claims, characterized in that the components of the frequency converter include at least one component from the group of switching power supply, rectifier, DC capacitor, power unit, processor and cooling device.
1 1. Innenrüttler zum Verdichten von Beton, mit - einem eine Schwingungserzeugungseinrichtung und einen die1 1. Internal vibrator for compacting concrete, with - one vibration generator and one die
Schwingungserzeugungseinrichtung antreibenden Elektromotor aufnehmenden Rüttelgehäuse (1); einem an dem Rüttelgehäuse ( 1) mit einem Ende befestigten Schutzschlauch (2); - einem an dem anderen Ende des Schutzschlauchs (2) befestigtenVibrating device driving electric motor receiving vibrator housing (1); a protective tube (2) attached to the vibrating housing (1) at one end; - One attached to the other end of the protective tube (2)
Kopplungsstück (3); einem das Kopplungsstück (3) mit einem einen Netzstecker (8) tragenden Steckergehäuse (9) verbindenden und zu einer Elektrozuführung zum Elektromotor gehörenden Elektrokabel (7); - einem in der Elektrozuführung vom Netzstecker zum Elektromotor angeordneten Schalter; und mit einem den Elektromotor speisenden, mit dem Netzstecker elektrisch koppelbaren, in dem Kopplungsstück angeordneten und aus einem oder mehreren Bauelementen bestehenden Frequenzumformer zum Erzeugen ei- ner elektrischen Frequenz, die von einer Netzfrequenz abweicht; dadurch gekennzeichnet, daß der Schalter von dem Kopplungsstück getrennt angeordnet ist.Coupling piece (3); an electrical cable (7) connecting the coupling piece (3) to a plug housing (9) carrying a mains plug (8) and belonging to an electrical feed to the electric motor; - A switch arranged in the electrical feed from the mains plug to the electric motor; and with a frequency converter which feeds the electric motor and which can be electrically coupled to the mains plug, is arranged in the coupling piece and consists of one or more components for generating an electrical frequency which deviates from a mains frequency; characterized in that the switch is arranged separately from the coupling piece.
12. Innenrüttler nach Anspruch 1 1 , dadurch gekennzeichnet, daß der Schalter in das Steckergehäuse (9) integriert ist. 12. Internal vibrator according to claim 1 1, characterized in that the switch is integrated in the connector housing (9).
13. Innenrüttler zum Verdichten von Beton, mit einem eine Schwingungserzeugungseinrichtung und einen die Schwingungserzeugungseinrichtung antreibenden Elektromotor aufnehmenden Rüttelgehäuse (1); - einem das Rüttelgehäuse ( 1) mit einem einen Schalter (4) tragenden13. internal vibrator for compacting concrete, having a vibrating housing (1) receiving an oscillation generating device and an electric motor driving the oscillating generating device; - One the vibrating housing (1) with a switch (4) carrying
Schaltergehäuse (3) verbindenden Schutzschlauch (2); einem an das Schaltergehäuse (3) angeschlossenen, zu einem Netzstecker (8) führenden Elektrokabel (7); und mit einem den Elektromotor speisenden, mit dem Netzstecker (8) elek- trisch koppelbaren und aus einem oder mehreren Bauelementen bestehenden Frequenzumformer zum Erzeugen einer elektrischen Frequenz, die von einer Netzfrequenz abweicht; dadurch gekennzeichnet, daß wenigstens ein Teil der Bauelemente des Frequenzumformers in einem zwischen dem Schaltergehäuse (3) und dem Netzstecker (8) vorgesehenen Umformergehäuse angeordnet ist. Protective hose (2) connecting the switch housing (3); an electrical cable (7) connected to the switch housing (3) and leading to a mains plug (8); and with a frequency converter that feeds the electric motor, can be electrically coupled to the mains plug (8) and consists of one or more components to generate an electrical frequency that deviates from a mains frequency; characterized in that at least some of the components of the frequency converter are arranged in a converter housing provided between the switch housing (3) and the mains plug (8).
EP00912496A 1999-03-24 2000-02-22 Poker vibrator with frequency converter Expired - Lifetime EP1163409B1 (en)

Applications Claiming Priority (3)

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DE19913305 1999-03-24
DE19913305A DE19913305C2 (en) 1999-03-24 1999-03-24 Internal vibrator with frequency converter
PCT/EP2000/001429 WO2000056999A1 (en) 1999-03-24 2000-02-22 Poker vibrator with frequency converter

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EP1163409A1 true EP1163409A1 (en) 2001-12-19
EP1163409B1 EP1163409B1 (en) 2006-10-25

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US (2) US6619832B1 (en)
EP (1) EP1163409B1 (en)
JP (1) JP2002540322A (en)
DE (3) DE19964444B4 (en)
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EP1163409B1 (en) 2006-10-25
WO2000056999A1 (en) 2000-09-28
DE19913305C2 (en) 2003-01-02
US20030198123A1 (en) 2003-10-23
US6619832B1 (en) 2003-09-16
JP2002540322A (en) 2002-11-26
DE50013664D1 (en) 2006-12-07
US6733169B2 (en) 2004-05-11
DE19913305A1 (en) 2000-10-12
DE19964444B4 (en) 2008-06-26

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