EP0965685B1 - Tamping beam for a road finisher - Google Patents
Tamping beam for a road finisher Download PDFInfo
- Publication number
- EP0965685B1 EP0965685B1 EP99110690A EP99110690A EP0965685B1 EP 0965685 B1 EP0965685 B1 EP 0965685B1 EP 99110690 A EP99110690 A EP 99110690A EP 99110690 A EP99110690 A EP 99110690A EP 0965685 B1 EP0965685 B1 EP 0965685B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- screed
- tamper bar
- base plate
- screed 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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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
- E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
- E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
- E01C19/407—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with elements or parts partly or fully immersed in or penetrating into the material to act thereon, e.g. immersed vibrators or vibrating parts, kneading tampers, spaders
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
- E01C2301/10—Heated screeds
Definitions
- the invention relates to a screed for a paver according to the Preamble of claim 1.
- Asphalt pavers usually include one on the back in the direction of installation Screed arranged behind a auger. Such screeds are Articulated on tie arms on the paver, so that they can be installed Swim material.
- Such a screed is known from EP 0 641 887 A1, in which in Installation direction in front of a base plate and designed as a tamper bar Movable tool is arranged, which is transverse to the direction of installation extends.
- the tamper bar can be driven by an eccentric drive and via a heating element, e.g. a heating element, electrically heated.
- the tamper bar comprises at least one wear part and at least one support part, wherein at least one channel for receiving the heating element in the wearing part, in Carrier part or between wear part and carrier part is formed. That in the channel located heating element is thus in operation of the screed with Tamper bar moved up and down. As a result of the moving supply lines there are frequent malfunctions.
- the object of the invention is a screed for a paver to create according to the preamble of claim 1, in which the heating of The tamper bar is less prone to failure.
- the tamper bar over at least one coil arranged adjacent to this can be heated electrically.
- the A high-frequency current can be applied to the coil via a current source, being in the case of a high frequency current flowing through the coil Eddy currents can be induced in the tamper bar.
- the tamper bar preferably a short circuit for the magnetic field generated by the coil.
- the at least one coil can in particular have a U-shaped magnetizable core have, the tamper bar forms the yoke to the core, but also as Air coil, ring coil with sufficient winding spacing or rod-shaped coil be trained.
- the geometry of the coil is the respective application Space adapted.
- the power source can be an AC power source or be a three-phase source, and it can be followed by a frequency converter his.
- the tamper bar is an electrical conductor in which a magnetic River eddy currents are inducible. The high-frequency flowing through the coils Current creates a periodically changing magnetic field, which Eddy currents induced in the tamper bar. The resulting warming is used to heat the tamper bar, so that no heating elements with Cable feeds are required, which are moved with the tamper bar have to.
- the coils can be on the base plate on a front wall the screed or on the screed body.
- the coils are preferably low spatial distance from the component to be heated.
- the front in the direction of installation tamper Pre-compression of the material to be installed can be electrical Heating of the front tamper bar in the direction of installation by at least one the front wall of the screed arranged coil take place while the Heating of the rear tamper bar in the installation direction by at least one the bottom plate arranged coil takes place.
- bitumen which has cooled over night and hardened as a result by correspondingly increasing the current output applied by the coils brought to a temperature significantly above normal Working temperature of the tamper bar is from 120 to 140 ° C. That way softened bitumen in the area of the tamper bar and resolved if necessary and the period until the commissioning of the Screed shortened.
- the screed shown for a paver includes a bottom floating on built-in material and this smoothing and compacting Base plate 1, which preferably has a carrier 2 with a vibration shaft 3 is connected, which is coupled to a vibration drive (not shown).
- Tamper bar 4 In the installation direction immediately in front of the base plate 1 is a cross to Installation direction over the entire width of the base plate 1 extending Tamper bar 4 arranged.
- the tamper bar 4 is via an eccentric drive 5 can be driven up and down by an adjustable stroke.
- the tamper bar 4 has an inlet slope 6 on its front edge. The angle of the inlet slope 6 is preferably between 30 ° and 70 ° in order to achieve an optimal supply of to ensure the material to be installed.
- the screed also has the material to be installed on one side feeding auger of the paver towards a front wall 7.
- the Front wall 7 comprises a lower guide section 8, which leads to tamper bar 4 is inclined and ends adjacent to it.
- the angle of inclination of the Guide section 8 suitably corresponds approximately to the angle of Entry slope 6 of the tamper bar 4.
- Coils 10 provided with magnetizable core 9 are arranged on the bottom plate 1 .
- the spools 10 can also be designed as air coils, ring coils or rod-shaped coils his. When using toroidal coils, the distance is closer To choose coil windings large enough so that the coil wire surrounding magnetic field for induction of eddy currents in the tamper bar 4 is sufficient.
- coils 10 with a U-shaped magnetizable core 9 forms the tamper bar 4 the yoke for the core 9 and thus a short circuit for the magnetic field generated by the coil 10.
- the core 9 can be completely or partially surrounded by the respective coil 10 his.
- the U-shape of the magnetizable core 9 can also have a central leg have, which carries the coil 10.
- Ferrites are particularly advantageous because of their low electrical Conductivity with high permeability only very small eddy current losses exhibit.
- the Tamper bar 4 can be almost over the entire width of the Tamper bar 4 extending coil 10 may be provided, or according to Fig. 3 a plurality of coils 10 equidistant to each other across the width in the installation direction the tamper bar 4 can be arranged distributed.
- the at least one coil 10 is like this arranged on the base plate 1 that the U-shaped core 9 with its free Ends adjacent to the tamper bar 4 along the front edge of the base plate 1 is arranged so that the tamper bar 4 the yoke to the respective core 9 of the Coils 10 forms.
- the coil 10 from FIG. 2 can be connected to a Power source (not shown) may be connected.
- the current source 11 can be a AC source or a three-phase source, and you can one Frequency converter 12 may be connected downstream.
- the flowing in the coils 10 high-frequency current produces a periodically changing direction Magnetic field.
- eddy currents in the Tamper bar 4 induced, whereby it is heated.
- the base plate 1 can also be electrical be heatable. This electrical heating can be done using a resistance heater or by means of one or more heating cartridges or heating elements (ohmic Heating elements) take place, but the bottom plate 1 can also be analogous to the Tamper bar 4 are heated electromagnetically.
- one or several coils can be arranged on the base plate 1, preferably Ring coils are used. Here is the distance between the coil windings to be sufficiently large so that the magnetic field surrounding the coil wire is sufficient to induce eddy currents in the base plate 1.
- the coils can however, also have a U-shaped magnetizable core 9 or as Air coils can be formed.
- the coils can also be connected to the current source 11 be connected so that they also with a high frequency current are acted upon. As a result of one flowing through the coils high-frequency current periodically changing magnetic field become eddy currents induced in the base plate 1, whereby the base plate 1 is electrically heated.
- the coils 10 cannot be closed heating parts must be magnetically shielded.
- two tamper bars can also be used Installation direction can be arranged one behind the other.
- the in Installation direction of the front tamper bar (not shown) for pre-compression and the subsequent tamper bar 4 for further compression of the material to be installed.
- they can Coils 10 may be provided with a U-shaped magnetizable core 9, the Front tamper bar forms the yoke to the core 9 of the coils 10.
- the heating the front tamper bar then takes place in an analogous manner via eddy currents in response to a periodically changing magnetic field due to a by the on the front wall 7 arranged coils 10 flowing high-frequency current be induced in the front tamper bar.
- the regulation of the thermal output of the tamper bar 4 or the base plate 1 can secondary or primary controllable or controllable via a control loop or via a thermostat with two-point control and / or via frequency control respectively.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
- General Induction Heating (AREA)
- Road Paving Structures (AREA)
Description
Die Erfindung betrifft eine Einbaubohle für einen Straßenfertiger nach dem Oberbegriff des Anspruchs 1.The invention relates to a screed for a paver according to the Preamble of claim 1.
Straßenfertiger umfassen üblicherweise eine in Einbaurichtung rückseitig hinter einer Verteilerschnecke angeordnete Einbaubohle. Solche Einbaubohlen sind über Zugarme am Straßenfertiger angelenkt, so daß sie auf dem einzubauenden Material schwimmen.Asphalt pavers usually include one on the back in the direction of installation Screed arranged behind a auger. Such screeds are Articulated on tie arms on the paver, so that they can be installed Swim material.
Eine derartige Einbaubohle ist aus der EP 0 641 887 A1 bekannt, bei der in Einbaurichtung vor einer Bodenplatte ein als Stampferleiste ausgebildetes auf- und abbewegliches Werkzeug angeordnet ist, welches sich quer zur Einbaurichtung erstreckt. Die Stampferleiste ist durch einen Exzenterantrieb antreibbar sowie über ein Heizelement, z.B. einen Heizstab, elektrisch beheizbar. Die Stampferleiste umfaßt mindestens ein Verschleißteil und mindestens ein Trägerteil, wobei wenigstens ein Kanal zur Aufnahme des Heizelements im Verschleißteil, im Trägerteil oder zwischen Verschleißteil und Trägerteil ausgebildet ist. Das im Kanal befindliche Heizelement wird somit im Betrieb der Einbaubohle mit der Stampferleiste auf- und abbewegt. Infolge der mitbewegten Versorgungsleitungen kommt es zu häufigen Betriebsstörungen.Such a screed is known from EP 0 641 887 A1, in which in Installation direction in front of a base plate and designed as a tamper bar Movable tool is arranged, which is transverse to the direction of installation extends. The tamper bar can be driven by an eccentric drive and via a heating element, e.g. a heating element, electrically heated. The tamper bar comprises at least one wear part and at least one support part, wherein at least one channel for receiving the heating element in the wearing part, in Carrier part or between wear part and carrier part is formed. That in the channel located heating element is thus in operation of the screed with Tamper bar moved up and down. As a result of the moving supply lines there are frequent malfunctions.
Aufgabe der Erfindung ist es, eine Einbaubohle für einen Straßenfertiger nach dem Oberbegriff des Anspruchs 1 zu schaffen, bei der die Beheizung der Stampferleiste weniger störanfällig ausgebildet ist.The object of the invention is a screed for a paver to create according to the preamble of claim 1, in which the heating of The tamper bar is less prone to failure.
Diese Aufgabe wird entsprechend dem kennzeichnenden Teil des Anspruchs 1 gelöst.This task will be in accordance with the characterizing part of the claim 1 solved.
Hierzu ist bei einer Einbaubohle mit einer gegebenenfalls mit einem Vibrationsantrieb gekoppelten Bodenplatte, vor der in Einbaurichtung gesehen mindestens eine sich quer zur Einbaurichtung erstreckende, durch einen Antrieb auf- und abbewegliche Stampferleiste angeordnet ist, die Stampferleiste über mindestens eine benachbart zu dieser angeordnete Spule elektrisch beheizbar. Die Spule ist über eine Stromquelle mit einem hochfrequenten Strom beaufschlagbar, wobei im Falle eines durch die Spule fließenden hochfrequenten Stromes Wirbelströme in der Stampferleiste induzierbar sind. Hierbei bildet die Stampferleiste vorzugsweise einen Kurzschluß für das durch die Spule erzeugte Magnetfeld. Die wenigstens eine Spule kann insbesondere einen U-förmigen magnetisierbaren Kern aufweisen, wobei die Stampferleiste das Joch zum Kern bildet, aber auch als Luftspule, Ringspule mit genügendem Windungsabstand oder stabförmige Spule ausgebildet sein. Die Geometrie der Spule ist hierbei den jeweiligen Anwendungsund Platzverhältnissen angepaßt. Die Stromquelle kann eine Wechselstromquelle oder eine Drehstromquelle sein, und ihr kann ein Frequenzumrichter nachgeschaltet sein. Die Stampferleiste ist ein elektrischer Leiter, in dem über einen magnetischen Fluß Wirbelströme induzierbar sind. Der durch die Spulen fließende hochfrequente Strom erzeugt ein sich periodisch in der Richtung änderndes Magnetfeld, welches Wirbelströme in der Stampferleiste induziert. Die hieraus resultierende Erwärmung dient zur Beheizung der Stampferleiste, so daß keine Heizelemente mit Kabelzuführungen erforderlich sind, welche mit der Stampferleiste bewegt werden müssen.For this purpose, with a screed with a possibly with a Vibration drive coupled base plate, seen in the direction of installation at least one extending transversely to the direction of installation by a drive up and down movable tamper bar is arranged, the tamper bar over at least one coil arranged adjacent to this can be heated electrically. The A high-frequency current can be applied to the coil via a current source, being in the case of a high frequency current flowing through the coil Eddy currents can be induced in the tamper bar. Here forms the tamper bar preferably a short circuit for the magnetic field generated by the coil. The at least one coil can in particular have a U-shaped magnetizable core have, the tamper bar forms the yoke to the core, but also as Air coil, ring coil with sufficient winding spacing or rod-shaped coil be trained. The geometry of the coil is the respective application Space adapted. The power source can be an AC power source or be a three-phase source, and it can be followed by a frequency converter his. The tamper bar is an electrical conductor in which a magnetic River eddy currents are inducible. The high-frequency flowing through the coils Current creates a periodically changing magnetic field, which Eddy currents induced in the tamper bar. The resulting warming is used to heat the tamper bar, so that no heating elements with Cable feeds are required, which are moved with the tamper bar have to.
Bei einem mit einer solchen Einbaubohle versehenen Straßenfertiger ist darüber hinaus der konstruktive Aufwand geringer, da die Stampferleiste keinen Kanal für ein Heizelement benötigt.With a paver provided with such a screed in addition, the design effort is lower, since the tamper bar does not Channel required for a heating element.
Die Spulen können hierbei auf der Bodenplatte, an einer Vorderwand der Einbaubohle oder am Bohlenkörper angeordnet sein. Um magnetische Feldverluste zu minimieren, sind die Spulen vorzugsweise in einem geringen räumlichen Abstand zu dem jeweils zu beheizenden Bauteil angeordnet. Insbesondere kann eine Spule am in Einbaurichtung vorderen Rand der Bodenplatte bzw. an der Vorderwand der Einbaubohle vorgesehen sein, wobei sich die Spule nahezu über die gesamte Breite der Bodenplatte erstreckt. Ferner können auch mehrere Spulen in Einbaurichtung äquidistant zueinander am in Einbaurichtung vorderen Rand der Bodenplatte und/oder der Vorderwand angeordnet sein.The coils can be on the base plate on a front wall the screed or on the screed body. To magnetic To minimize field losses, the coils are preferably low spatial distance from the component to be heated. In particular, a coil on the front edge of the installation direction Base plate or be provided on the front wall of the screed, where the coil extends almost over the entire width of the base plate. Can also also several coils in the installation direction equidistant to each other on in Installation direction front edge of the base plate and / or the front wall be arranged.
Wenn zwei Stampferleisten in Einbaurichtung benachbart hintereinander angeordnet sind, wobei die in Einbaurichtung vordere Stampferleiste zur Vorverdichtung des einzubauenden Materials dient, kann eine elektrische Beheizung der in Einbaurichtung vorderen Stampferleiste durch mindestens eine an der Vorderwand der Einbaubohle angeordnete Spule erfolgen, während die Beheizung der in Einbaurichtung hinteren Stampferleiste durch mindestens eine an der Bodenplatte angeordnete Spule erfolgt.If two tamper bars are located one behind the other in the direction of installation are arranged, the front in the direction of installation tamper Pre-compression of the material to be installed can be electrical Heating of the front tamper bar in the direction of installation by at least one the front wall of the screed arranged coil take place while the Heating of the rear tamper bar in the installation direction by at least one the bottom plate arranged coil takes place.
Ferner kann zwecks Erweichen bzw. Lösen von an der Stampferleiste während des Betriebs in den Stampferraum eingedrungenem und durch Stillstand, etwa über Nacht erkaltetem und dadurch erhärtetem Bitumen die Stampferleiste durch entsprechende Erhöhung der durch die Spulen aufgebrachten Stromleistung auf eine Temperatur gebracht werden, die erheblich über der normalen Arbeitstemperatur der Stampferleiste von 120 bis 140°C liegt. Auf diese Weise wird im Bereich der Stampferleiste erhärtetes Bitumen wieder erweicht und gegebenenfalls gelöst und der Zeitraum bis zur erneuten Inbetriebnahme der Einbaubohle verkürzt. Furthermore, for the purpose of softening or releasing on the tamper bar that has entered the tamper chamber during operation and has come to a standstill, bitumen, which has cooled over night and hardened as a result by correspondingly increasing the current output applied by the coils brought to a temperature significantly above normal Working temperature of the tamper bar is from 120 to 140 ° C. That way softened bitumen in the area of the tamper bar and resolved if necessary and the period until the commissioning of the Screed shortened.
Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further refinements of the invention are as follows Description and the dependent claims.
Die Erfindung wird nachstehend anhand von in den beigefügten Abbildungen
dargestellten Ausführungsbeispielen näher erläutert.
Die dargestellte Einbaubohle für einen Straßenfertiger umfaßt unterseitig eine
auf eingebautem Material schwimmende und dieses glättende und verdichtende
Bodenplatte 1, die bevorzugt über einen Träger 2 mit einer Vibrationswelle 3
verbunden ist, die mit einem Vibrationsantrieb (nicht dargestellt) gekoppelt ist.The screed shown for a paver includes a bottom
floating on built-in material and this smoothing and compacting
Base plate 1, which preferably has a carrier 2 with a
In Einbaurichtung unmittelbar vor der Bodenplatte 1 ist eine sich quer zur
Einbaurichtung über die gesamte Breite der Bodenplatte 1 erstreckende
Stampferleiste 4 angeordnet. Die Stampferleiste 4 ist über einen Exzenterantrieb 5
um einen einstellbaren Hub auf- und abbeweglich antreibbar. Die Stampferleiste 4
weist an ihrer Vorderkante eine Einlaufschräge 6 auf. Der Winkel der Einlaufschräge
6 liegt vorzugsweise zwischen 30° und 70°, um eine optimale Zufuhr von
einzubauendem Material zu gewährleisten.In the installation direction immediately in front of the base plate 1 is a cross to
Installation direction over the entire width of the base plate 1 extending
Tamper bar 4 arranged. The tamper bar 4 is via an
Die Einbaubohle weist ferner zur Seite einer das einzubauende Material
zuführenden Verteilerschnecke des Straßenfertigers hin eine Vorderwand 7 auf. Die
Vorderwand 7 umfaßt einen unteren Führungsabschnitt 8, der zur Stampferleiste 4
geneigt ist und benachbart hierzu endet. Der Neigungswinkel des
Führungsabschnitts 8 entspricht zweckmäßigerweise in etwa dem Winkel der
Einlaufschräge 6 der Stampferleiste 4.The screed also has the material to be installed on one side
feeding auger of the paver towards a
An der Bodenplatte 1 sind oberseitig eine oder mehrere mit einem U-förmigen
magnetisierbaren Kern 9 versehene Spulen 10 angeordnet. (Die Spulen
10 können auch als Luftspulen, Ringspulen oder stabförmige Spulen ausgebildet
sein. Bei Verwendung von Ringspulen ist der Abstand benachbarter
Spulenwicklungen ausreichend groß zu wählen, so daß das den Spulendraht
umgebende Magnetfeld zur Induktion von Wirbelströmen in der Stampferleiste 4
ausreicht.) Bei Verwendung von Spulen 10 mit U-förmigem magnetisierbaren Kern
9 bildet die Stampferleiste 4 das Joch für den Kern 9 und damit einen Kurzschluß
für das durch die Spule 10 erzeugte Magnetfeld. Bei Verwendung des U-förmigen
Kerns 9 kann dieser vollständig oder teilweise von der jeweiligen Spule 10 umgeben
sein. Die U-Form des magnetisierbaren Kerns 9 kann auch einen Mittelschenkel
aufweisen, der die Spule 10 trägt. Als Material für den magnetisierbaren Kern 9 sind
insbesondere Ferrite vorteilhaft, da sie wegen ihrer geringen elektrischen
Leitfähigkeit bei gleichzeitig hoher Permeabilität nur sehr kleine Wirbelstromverluste
aufweisen.On the bottom plate 1 there are one or more U-shaped ones on the
Gemäß Fig. 2 kann eine sich nahezu über die gesamte Breite der
Stampferleiste 4 erstreckende Spule 10 vorgesehen sein, oder es können gemäß
Fig. 3 mehrere Spulen 10 in Einbaurichtung äquidistant zueinander über die Breite
der Stampferleiste 4 verteilt angeordnet sein. Die mindestens eine Spule 10 ist so
auf der Bodenplatte 1 angeordnet, daß der U-förmige Kern 9 mit seinem freien
Enden benachbart zur Stampferleiste 4 längs der Vorderkante der Bodenplatte 1
angeordnet ist, so daß die Stampferleiste 4 das Joch zum jeweiligen Kern 9 der
Spulen 10 bildet.2 can be almost over the entire width of the
Tamper bar 4 extending
Die Spulen 10 von Fig. 3 sind parallel zueinander an eine gemeinsame
Stromquelle 11 angeschlossen. Entsprechend kann die Spule 10 aus Fig. 2 an eine
Stromquelle (nicht dargestellt) angeschlossen sein. Die Stromquelle 11 kann eine
Wechselstromquelle oder eine Drehstromquelle sein, und ihr kann ein
Frequenzumrichter 12 nachgeschaltet sein. Der in den Spulen 10 fließende
hochfrequente Strom erzeugt ein sich periodisch in der Richtung änderndes
Magnetfeld. Infolge des wechselnden Magnetfeldes werden Wirbelströme in der
Stampferleiste 4 induziert, wodurch diese erwärmt wird.3 are parallel to one another in
Zusätzlich zur Stampferleiste 4 kann auch die Bodenplatte 1 elektrisch
beheizbar sein. Diese elektrische Beheizung kann mittels einer Widerstandsheizung
oder mittels einer oder mehrerer Heizpatronen oder Heizstäbe (ohmsche
Heizelemente) erfolgen, die Bodenplatte 1 kann aber auch analog zu der
Stampferleiste 4 elektromagnetisch beheizt werden. Hierzu können eine oder
mehrere Spulen auf der Bodenplatte 1 angeordnet sein, wobei vorzugsweise
Ringspulen verwendet werden. Hierbei ist der Abstand der Spulenwicklungen
ausreichend groß zu wählen, so daß das den Spulendraht umgebende Magnetfeld
ausreicht, um Wirbelströme in der Bodenplatte 1 zu induzieren. Die Spulen können
jedoch auch einen U-förmigen magnetisierbaren Kern 9 aufweisen oder als
Luftspulen ausgebildet sein. Die Spulen können ebenfalls an die Stromquelle 11
angeschlossen sein, so daß sie ebenfalls mit einem hochfrequenten Strom
beaufschlagbar sind. Infolge des bei einem durch die Spulen fließenden
hochfrequenten Strom periodisch sich ändernden Magnetfelds werden Wirbelströme
in der Bodenplatte 1 induziert, wodurch die Bodenplatte 1 elektrisch beheizt wird.In addition to the tamper bar 4, the base plate 1 can also be electrical
be heatable. This electrical heating can be done using a resistance heater
or by means of one or more heating cartridges or heating elements (ohmic
Heating elements) take place, but the bottom plate 1 can also be analogous to the
Tamper bar 4 are heated electromagnetically. To do this, one or
several coils can be arranged on the base plate 1, preferably
Ring coils are used. Here is the distance between the coil windings
to be sufficiently large so that the magnetic field surrounding the coil wire
is sufficient to induce eddy currents in the base plate 1. The coils can
however, also have a U-shaped
Da nur die Stampferleiste 4 bzw. die Bodenplatte 1 beheizt werden sollen,
kann vorzugsweise sichergestellt werden, daß die Wirbelströme nur in einem zu
beheizenden Bereich entstehen. Hierzu können die Spulen 10 gegenüber nicht zu
beheizenden Teilen magnetisch abgeschirmt sein.Since only the tamper bar 4 or the base plate 1 are to be heated,
can preferably be ensured that the eddy currents only in one
heating area arise. For this purpose, the
Statt einer Stampferleiste 4 können auch zwei Stampferleisten in
Einbaurichtung hintereinander angeordnet sein. In diesem Falle sorgt die in
Einbaurichtung vordere Stampferleiste (nicht dargestellt) für eine Vorverdichtung
und die nachfolgende Stampferleiste 4 für eine Weiterverdichtung des
einzubauenden Materials. Bei einer solchen Anordnung sind vorzugsweise weitere
zur vorderen Stampferleiste benachbarte Spulen 10 zur Beheizung der vorderen
Stampferleiste an der Vorderwand 7 angeordnet. Insbesondere können diese
Spulen 10 mit einem U-förmigen magnetisierbaren Kern 9 versehen sein, wobei die
vordere Stampferleiste das Joch zum Kern 9 der Spulen 10 bildet. Die Beheizung
der vorderen Stampferleiste erfolgt dann in analoger Weise über Wirbelströme, die
in Reaktion auf ein periodisch sich änderndes Magnetfeld aufgrund eines durch die
an der Vorderwand 7 angeordneten Spulen 10 fließenden hochfrequenten Stromes
in der vorderen Stampferleiste induziert werden. Instead of a tamper bar 4, two tamper bars can also be used
Installation direction can be arranged one behind the other. In this case, the in
Installation direction of the front tamper bar (not shown) for pre-compression
and the subsequent tamper bar 4 for further compression of the
material to be installed. With such an arrangement there are preferably others
Coils 10 adjacent to the front tamper bar for heating the front
Tamper bar arranged on the
Die Regelung der Wärmeleistung der Stampferleiste 4 bzw. der Bodenplatte 1 kann sekundär oder primär regelbar bzw. über einen Regelkreis steuerbar oder über einen Thermostaten mit Zwei-Punkt-Regelung und/oder über Frequenzregelung erfolgen.The regulation of the thermal output of the tamper bar 4 or the base plate 1 can secondary or primary controllable or controllable via a control loop or via a thermostat with two-point control and / or via frequency control respectively.
Claims (15)
- Screed for a paver with a base plate (1) optionally connected with a vibration drive, in front of which, looking in the paving direction, at least one tamper bar (4) which can be moved up and down by a drive (5) and extending transverse to the paving direction, is arranged, which is electrically heatable, characterised in that at least one coil (10) is arranged adjacent to the tamper bar (4) which can be supplied with high-frequency current via a power supply (11) which induces eddy currents in the tamper bar (4).
- Screed according to claim 1, characterised in that the tamper bar (4) forms a short circuit for the magnetic field generated by the at least one coil (10).
- Screed according to claim 1 or 2, characterised in that the at least one coil (10) displays a magnetisable U-shaped core (9).
- Screed according to one of claims 1 to 3, characterised in that several coils (10) are arranged in the paving direction equidistant from each other.
- Screed according to one of claims 1 to 4, characterised in that the at least one coil (10) is arranged on the base plate (1).
- Screed according to one of claims 1 to 5, characterised in that two tamper bars (4) are arranged adjacent one behind the other in the paving direction.
- Screed. according to one of claims 1 to 6, characterised in that at least one coil (10) is arranged on one front wall (7) of the screed.
- Screed according to one of claims 1 to 7, characterised in that a frequency converter is connected in series to the power supply (11).
- Screed according to one of claims 1 to 8, characterised in that the power source (11) is an a.c. power supply.
- Screed according to one of claims 1 to 9, characterised in that the power supply (11) is a three-phase current supply.
- Screed according to one of claims 1 to 10, characterised in that the at least one coil (10) is shielded against parts which must not be heated.
- Screed according to one of claims 1 to 11, characterised in that the base plate (1) can be electrically heated.
- Screed according to one of claims 1 to 12, characterised in that at least one coil is arranged adjacent to the base plate (1), which can be supplied with high-frequency current via a power supply (11) which induces eddy currents in the base plate (1).
- Screed according to claim 13, characterised in that the coil is a ring coil.
- Screed according to one of claims 1 to 14, characterised in that a temperature controller is provided for the tamper bar (4) and/or the base plate (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19827577A DE19827577C1 (en) | 1998-06-20 | 1998-06-20 | Surface leveler for road surfacing machine |
| DE19827577 | 1998-06-20 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0965685A2 EP0965685A2 (en) | 1999-12-22 |
| EP0965685A3 EP0965685A3 (en) | 2001-03-14 |
| EP0965685B1 true EP0965685B1 (en) | 2004-03-10 |
Family
ID=7871536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99110690A Expired - Lifetime EP0965685B1 (en) | 1998-06-20 | 1999-06-02 | Tamping beam for a road finisher |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6124580A (en) |
| EP (1) | EP0965685B1 (en) |
| JP (1) | JP4083349B2 (en) |
| CN (1) | CN1148489C (en) |
| BR (1) | BR9903268A (en) |
| CA (1) | CA2275522C (en) |
| DE (2) | DE19827577C1 (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6318928B1 (en) * | 2000-01-07 | 2001-11-20 | Astec Industries, Inc. | Method and apparatus for electrically heating a screed assembly in a paving machine |
| NL1016907C2 (en) * | 2000-12-18 | 2002-06-19 | Vermeer Infrastructuur B V | Road construction and method for realizing such a road construction. |
| GB0115039D0 (en) * | 2001-06-20 | 2001-08-08 | Finning Uk Ltd | Electrically heated paving screed |
| JP4097468B2 (en) * | 2002-06-20 | 2008-06-11 | グローリー株式会社 | Mobility assistance device for nursing care |
| US6981820B2 (en) * | 2002-10-30 | 2006-01-03 | Caterpillar Paving Products Inc. | Screed heating arrangement |
| CA2515660A1 (en) * | 2004-08-11 | 2006-02-11 | Dirk Heims | Vibratory paving screed for a paver |
| US7121763B1 (en) | 2004-09-10 | 2006-10-17 | Roadtec, Inc. | Folding end gate for screed assembly |
| JP4330639B2 (en) * | 2006-03-29 | 2009-09-16 | 株式会社竹中工務店 | Asphalt pavement removal method, asphalt pavement removal system, electromagnetic induction coil unit, asphalt pavement removal apparatus, and peeling method |
| DE102008007307A1 (en) * | 2008-02-02 | 2009-08-06 | Abg Allgemeine Baumaschinen-Gesellschaft Mbh | Apparatus for compacting road building materials |
| DE102008007308B3 (en) * | 2008-02-02 | 2009-08-13 | Abg Allgemeine Baumaschinen-Gesellschaft Mbh | Apparatus for compacting road building materials |
| US20120111855A1 (en) * | 2009-07-15 | 2012-05-10 | Benjamin Provoost | Modular induction heater system |
| IT1403029B1 (en) * | 2010-11-12 | 2013-09-27 | Marini Spa | STANDING BENCH WITH INDUCTION HEATING SYSTEM |
| CN102518026B (en) * | 2011-12-09 | 2014-10-01 | 西安建筑科技大学 | Screed possessing uniform amplitude of spreader |
| US8371770B1 (en) * | 2012-04-09 | 2013-02-12 | Caterpillar Inc. | Apparatus for tamping paving material |
| CN103352415B (en) * | 2013-06-18 | 2016-05-25 | 湖南三一路面机械有限公司 | A kind of compaction apparatus and paver |
| EP2905378B1 (en) * | 2014-02-07 | 2016-09-21 | Joseph Vögele AG | Tamping device |
| CN105019343A (en) * | 2014-04-16 | 2015-11-04 | 戴纳派克（中国）压实摊铺设备有限公司 | Screed and paving machine with screed |
| DE102015012298A1 (en) * | 2015-09-23 | 2017-03-23 | Abg Allgemeine Baumaschinen-Gesellschaft Mbh | Method of operating a self-propelled road paver and paver therefor |
| US9915042B2 (en) * | 2015-11-16 | 2018-03-13 | Cutler Repaving, Inc. | Multiple burner zone controlled asphalt heating hood |
| EP3170937B1 (en) * | 2015-11-18 | 2018-09-19 | BOMAG GmbH | Road finisher, tamper bar for a road finisher, and method for manufacturing a tamper bar |
| EP3170938B1 (en) * | 2015-11-18 | 2019-03-13 | BOMAG GmbH | Road finisher, piston rod for a road finisher, and method for manufacturing an assembly of a piston rod and a tamper bar |
| DE102017002010A1 (en) * | 2017-03-03 | 2018-09-06 | Dynapac Gmbh | Method for operating a paver and screed for a paver |
| US11208770B2 (en) * | 2017-10-06 | 2021-12-28 | Volvo Construction Equipment Ab | Screed arrangement |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6911204A (en) * | 1968-09-17 | 1970-03-19 | ||
| JPS62200119A (en) * | 1986-02-27 | 1987-09-03 | Nippon Syst Apurikeeshiyon:Kk | Device of heating floor face with steam |
| JPS63186700A (en) * | 1987-01-28 | 1988-08-02 | 信濃電気株式会社 | High frequency induction heating apparatus |
| US5417516A (en) * | 1993-07-20 | 1995-05-23 | Universal Screed Inc. | Electrically heated paving screed |
| DE4325868C2 (en) * | 1993-08-02 | 1997-11-13 | Junker Gmbh O | Device for inductive longitudinal field heating of flat metal |
| DE9313161U1 (en) * | 1993-09-01 | 1993-10-28 | Voegele Ag J | Pavers and tools |
| JP2979388B2 (en) * | 1997-03-14 | 1999-11-15 | 金亀建設株式会社 | Screed plate heating device for spread leveling machine |
-
1998
- 1998-06-20 DE DE19827577A patent/DE19827577C1/en not_active Expired - Fee Related
-
1999
- 1999-06-02 DE DE59908794T patent/DE59908794D1/en not_active Expired - Lifetime
- 1999-06-02 EP EP99110690A patent/EP0965685B1/en not_active Expired - Lifetime
- 1999-06-17 CN CNB991086392A patent/CN1148489C/en not_active Expired - Fee Related
- 1999-06-18 CA CA002275522A patent/CA2275522C/en not_active Expired - Fee Related
- 1999-06-18 US US09/336,475 patent/US6124580A/en not_active Expired - Lifetime
- 1999-06-18 JP JP17321799A patent/JP4083349B2/en not_active Expired - Fee Related
- 1999-06-18 BR BR9903268-6A patent/BR9903268A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1240244A (en) | 2000-01-05 |
| DE19827577C1 (en) | 1999-10-28 |
| DE59908794D1 (en) | 2004-04-15 |
| BR9903268A (en) | 2000-04-18 |
| JP2000027117A (en) | 2000-01-25 |
| CA2275522C (en) | 2005-10-25 |
| EP0965685A3 (en) | 2001-03-14 |
| EP0965685A2 (en) | 1999-12-22 |
| US6124580A (en) | 2000-09-26 |
| CN1148489C (en) | 2004-05-05 |
| CA2275522A1 (en) | 1999-12-20 |
| JP4083349B2 (en) | 2008-04-30 |
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