EP2235264A1 - Device for compacting road paving materials - Google Patents

Device for compacting road paving materials

Info

Publication number
EP2235264A1
EP2235264A1 EP09706938A EP09706938A EP2235264A1 EP 2235264 A1 EP2235264 A1 EP 2235264A1 EP 09706938 A EP09706938 A EP 09706938A EP 09706938 A EP09706938 A EP 09706938A EP 2235264 A1 EP2235264 A1 EP 2235264A1
Authority
EP
European Patent Office
Prior art keywords
heating element
recess
blow bar
tamper strip
tamper
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
EP09706938A
Other languages
German (de)
French (fr)
Other versions
EP2235264B1 (en
Inventor
Anton Mahler
Marc Niggemann
Oliver Lachmann
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.)
ABG Allgemeine Baumaschinen GmbH
Original Assignee
ABG Allgemeine Baumaschinen GmbH
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 ABG Allgemeine Baumaschinen GmbH filed Critical ABG Allgemeine Baumaschinen GmbH
Publication of EP2235264A1 publication Critical patent/EP2235264A1/en
Application granted granted Critical
Publication of EP2235264B1 publication Critical patent/EP2235264B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • E01C19/48—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 laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E01C19/4833—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 laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means
    • 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 device for compacting road building materials according to the preamble of claim 1.
  • Such a device is known from DE 26 00 108 A1.
  • a screed is attached, which is preceded by a rammer for pre-compression of the paving material.
  • the bituminous mixture which is in a warm state, sticks to the cold ramming bar.
  • the adhesive material adhering to the ramming bar leaves grooves in the lining, which can no longer be removed by the subsequent screed and therefore remain on the surface of the road surface.
  • it is known to heat the tamper strip The use of a gas burner was replaced by an electric heater, which in an open or closed Hollow profile, which forms the tamper strip is inserted. The electric heater is then inside the tamper strip.
  • a paver and tool as a tamper strip for a screed is known.
  • the tamper strip forms a channel between a support part and a wearing part, in which a heating element, in particular a heating element, is provided.
  • the heating element is a flat electric heating element, which is shielded by an insert upwards.
  • the supplement ensures that the heating element is clamped, so that there is the largest possible contact surface for the heat conduction.
  • the disadvantage here is that the heating element breaks frequently. The replacement of a defective heating element leads to undesirable downtime of the paver. The maintenance effort is also increased.
  • the object of the invention is therefore to provide a device for compacting road construction materials according to the preamble of claim 1, the maintenance of which is reduced by defective heating elements.
  • a tamper strip is provided with an electric heating element, the attachment is carried out by means of clamping by elastic deformation.
  • a statically acting energy storage is used by utilizing the elastic deformation.
  • the originating example of human muscle energy when inserting the heating element in the recess of the tamper bar is stored in a suitable manner.
  • the energy storage element acts according to the invention in the direction of the beating up and down movement for supporting the heating element.
  • the heating element is thus supported and fixed within the tamper strip on the length.
  • the heating element In a hammering rammer, the heating element must be secured against vibrations for purely mechanical reasons. The heating element is therefore protected against vibration. Fastenings by screws are not necessary because the spring action is maintained even in the heating state of the heating element.
  • the heating element is designed as a heating rod in corrugated or zigzag-like shape.
  • the resilient property of the heating element is utilized. This can be clamped by loaded corrugation in the rammer independently.
  • the heating element can be designed as a flat tubular heater or round tubular heater. According to the invention it has surprisingly been found that the round tubular heater complies with the heating capacity of Flachrohrsammlung stresses.
  • the tamper strip is a horizontally split construction having a support and a blow bar.
  • a groove is provided in which the heating element is located. After wearing the blow bar so the support bar can remain on the machine and continue to be used. The groove is thus not in the wear part.
  • the blow bars can be kept inexpensive.
  • the blow bars can be designed in several parts and bridged by a cover plate. The connection surfaces are thereby sealed.
  • 1a shows a schematic side view of a paver
  • 1 b schematically shows a sectional view of a screed
  • FIG. 3 shows schematically in section a tamper strip according to a second embodiment
  • FIG. 5 shows schematically a section A-A according to FIG. 4,
  • FIG. 6 shows schematically a section according to FIG. 4 during insertion of the heating element
  • FIG. 7 shows schematically in section a tamper strip according to a fourth exemplary embodiment
  • Fig. 9 shows schematically in section a tamper strip according to a fifth Embodiment
  • FIG. 11 shows schematically in section a tamper strip according to a sixth embodiment
  • FIG. 12 shows schematically a section E-E according to FIG. 11, FIG.
  • Fig. 13 shows schematically in section a tamper strip according to a seventh
  • FIG. 14 shows schematically a section F-F according to FIG. 13,
  • Fig. 15 shows schematically in section a tamper strip according to an eighth
  • FIG. 16 schematically shows a section G-G according to FIG. 15, FIG.
  • FIG. 17 shows schematically in section a tamper strip according to a ninth embodiment
  • FIG. 18 schematically shows a section H-H according to FIG. 17.
  • the paver 1 of FIG. 1 a comprises a chassis 2, a drive unit 3, a front in the direction of travel Gutbunker 4 and a rear auger 5. With lateral arms 6 a screed 7 is towed, which transported from the Gutbunker 4 to the rear, from the auger 5 built-in built-in.
  • the screed 7 is preferably a vibration screed that smoothes and compacts.
  • At the front in the direction of travel F front of the screed 7 at least one rammer 8 is arranged, as shown in Fig. 1 b. According to Fig. 1b two rammers 8 are arranged one behind the other. It is therefore a Doppelstampfer screed.
  • a rammer 8 may also be arranged downstream of the screed 7.
  • the screed 7 can be laterally extendable with a fixed working width or for larger working widths as an extendable screed.
  • the arranged in the direction of travel F in front of the screed 7 ram 8 operates as a precompression element.
  • FIGS. 1a and 1b thus show a device for compacting road building materials with a fastened to a paver 1, transversely to the direction of work of the paver 1 extending screed 7 and one of the same upstream rammer 8.
  • the rammer described below 8 may preferably additionally or alternatively the screed 7 be arranged downstream.
  • the rammer 8 has a tamper strip 9 which can be driven for a striking upward and downward movement.
  • a drive 10 is provided for driving the tamper strip 9.
  • the interior of the tamper strip 9 is equipped with an electric heater in the form of a rod-shaped, in a recess 11 of the tamper strip 9 clampable heating element 12.
  • the recess 11 forms an enclosed space for the heating element 12.
  • a heating element 12 is provided in the direction of the beating up and down movement S stored spring accumulator.
  • the spring accumulator causes a clamping by elastic deformation.
  • the spring accumulator clamps the heating element 12 along the recess 11 such that the heating element 12 is stabilized or free of play in the recess 11.
  • the thermal expansion of the heating element 12 in the direction of a free end 13 is given.
  • the inventive clamping of the heating element 12 by bracing without articulation avoids fractures of the heating element 12.
  • the recess 11 may have a round or angular cross-section, it may be formed by a core hole or it may be formed as a closed groove.
  • the heating element 12 is electrically connected via the terminal block 14 to a power source, for which a connection cable 19 is provided.
  • the terminal block 14 is attached to the tamper strip 9.
  • the heating element 12 is preferably formed as a corrugated, kinked or zigzag-shaped heating element whose elastic shape change forms the spring accumulator.
  • the heating element 12 is seated elastically biased in the recess 11 of the tamper strip 9.
  • the recess 11 extending along the tamper strip 9 thus has dimensions, in particular in height and in width, the elastic deformation of the heating element 12 and thus the bias determined (see Fig. 6).
  • the elastic deformation of the heating element 12 is exploited, to which the strength of the corrugation or the zigzag shape of the heating element is selected with respect to the recess 11.
  • Fig. 6 shows the energy derived from human muscle power (at the onset of heating element 12) to build up the statically acting spring accumulator utilizing elastic deformation.
  • the independent terminals of heating elements as heating elements 12 is independent of the tube shape.
  • the heating element 12 may be formed by a flat-tube heating element, a round-tube heating element or cartridge heating element.
  • the heating element 12 is formed as a flat tubular heater.
  • the heating element 12 is designed as a round tubular heater.
  • the number of waves of kinks 15, 16, 17, 18 may vary. At least one kink is required.
  • the axis of the buckling can vary. According to FIGS. 2 and 3, the kinks are in one plane. However, this is not absolutely necessary, as will be explained below with reference to FIGS. 7 to 18.
  • a spiral shape can also be selected. Any deviation from the straight shape allows clamping in the recess 11, as long as the spatial extent of the heating element 12 before insertion into the recess 11 is greater than the available space of the recess 11 after insertion, ie the formation of a spring accumulator.
  • FIG. 6 shows the insertion of a heating element 12 into the recess 11 of the tamper strip 9.
  • the recess 11 may be spatially curved.
  • an originally straight heating element is brought as a heating element 12 by the assembly in a curved shape with the result of an independent clamping.
  • the curvature of the heating element can be combined around an axis with a curved recess in another axis.
  • the resilient clamping effect can also be separated from the actual heating element 12.
  • an additional, unheated insert in wave or kink shape is used to clamp the heating element 12, as shown in Fig. 15, 16.
  • the heating element 12 is preferably formed as Rundrohrsammlungstab.
  • This Rundrohrsammlungstab has only one heating coil 20, the free end 13 is folded and returned. Beginning 21 and end 22 of a heating coil 20 are connected to the one terminal block 14 and fastened.
  • the heating coil 20 transfers heat to the tamper strip 9, wherein the contact with the tamper strip 9 is no longer a priority as in Flachrohrsammlung redesignn.
  • the folded heating coil 20 forms a heating package with two superimposed or juxtaposed rods of the heating coil 20 of a round tubular heater, which are connected in a common terminal block 14 with an electrical lead 19.
  • the provided in accordance with FIG. 3 four kinks 15, 16, 17, 18 are selected so that the heating element 12 builds enough spring tension to clamp during the operation of the rammer 8 sufficiently in the tamper strip 9.
  • the heating element 12 preferably has a good bending property, so that this allows its own elastic deformation.
  • the tamper strip 9 preferably comprises a support strip 23 and a beater bar 24.
  • the tamper strip 9 is thus divided horizontally.
  • To the training of Recess 11 in an enclosed space of the tamper strip 9 is preferably in the support bar 23 has a groove 25 in which the heating element 12 is located.
  • the groove 25 is closed by a top surface 26 of the beater bar 24 to form the recess 11.
  • the groove 25 can thus be mounted in a non-wearing part.
  • the blow bar 24 may consist of several blow bar segments.
  • the blow bar segments can be bridged by a cover plate.
  • the cover plate can then form the top surface 26 for limiting the recess 11.
  • the blow bar 24 is also preferably formed as a thin-walled profile.
  • the support bar 23 is adaptable as a supporting body to the conditions of use. The attachment of the rammer 8 to the drive 10, for example, via arms 28, 29 on the tamper strip. 9
  • FIGS. 4 to 18 show the electrical heating element 12 in the recess 11 of the tamper strip 9.
  • the respective fastening by clamping must on the one hand ensure that the heating element 12 is sufficiently fixed with respect to the vibrations occurring, on the other hand the resulting from the thermal expansion of the heating element 12 relative movement between the heating element 12 and the recess 11 may be possible.
  • Fig. 4 and Fig. 5 show the tamper strip 9 of FIG. 3 with two superposed rods of the heating coil 20 of a round tubular heater.
  • the recess 11 is closed at the front side of the tamper strip 9 by the connection block 14.
  • the heating element 12 is more kinked than in the assembled state.
  • the heating element 12 is pushed laterally into the groove 25 between support bar 23 and beater bar 24. Meanwhile, the heating element 12 deforms elastically and possibly proportionally plastically far enough in a prestressed form that it fills the groove 25. The proportion of elastic deformation causes the clamping.
  • the length of the recess 11 is dimensioned such that the heating element 12 can expand to the free end by sliding movement. As shown in FIG. 5, the heating element 12 is completely enclosed by the tamper strip in the closed system of the recess 11. No direct contact between heating element 12 as a round tubular heater and blow bar 24 is required.
  • the surface temperature of the round tubular heater increases in comparison to a flat tubular heater with contact.
  • the round tube heater is suitable for this higher temperature. The proportion of the heat flow from the reduced contact heat transfer of the round tubular heater is thus distributed in particular to the heat radiation and the convection as heat transfer types.
  • Fig. 7 and Fig. 8 show an embodiment of a heating element 12 with a round tubular heating element, which differs from Fig. 4 in that the curl or buckling is shorter.
  • Fig. 9 and Fig. 10 show an embodiment of a heating element 12 with a round tubular heating element, which is clamped transversely to the direction of impact, in which the heating coil 20 is corrugated or kinked horizontally. A kink 18 is shown.
  • the heating coil 20 is in the manner of a snake on the top surface 26 of the blow bar 24th
  • FIG. 11 and FIG. 12 show an exemplary embodiment with two bars of the heating coil 20 arranged next to one another.
  • the spring store here also stores the heating element 12 in the direction of impact S.
  • FIGS. 13 and 14 show an exemplary embodiment of a heating element 12 with a round tubular heating element which is clamped transversely to the direction of impact, comparable to FIGS. 9 and 10.
  • the two rods of the heating coil 20 lie above one another and not next to each other.
  • a corrugated or kinked insert 27 is provided as a spring store, the elastic deformation of which forms the spring accumulator.
  • the resilient clamping action is here separated from the actual heating element 12.
  • the supplement 27 is an additional, preferably unheated element in wave or buckling shape, which clamps the heating element 12.
  • a helical shaping of the heating coil 20 is provided instead of a staircase shape.

Abstract

The invention relates to a device for compacting road paving materials, comprising a screed board which is fastened on a road finisher and extends at a right angle to the direction of travel of the road finisher and a tamper that is mounted in front and/or behind the screed board. Said tamper has a tamper strip that can be driven to perform a striking upward and downward movement and the interior of which is equipped with an electrical heating unit in the form of a rod-shaped heating element that can be clamped into a recess of the tamper strip. The device according to the invention is characterized by a spring accumulator receiving the heating element in the direction of the striking upward and downward movement for clamping the heating element.

Description

Vorrichtung zum Verdichten von Straßenbaustoffen Apparatus for compacting road building materials
Die Erfindung betrifft eine Vorrichtung zum Verdichten von Straßenbaustoffen nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for compacting road building materials according to the preamble of claim 1.
Eine derartige Vorrichtung ist bekannt aus DE 26 00 108 A1. An dem Straßenfertiger ist danach eine Glättbohle befestigt, der ein Stampfer zur Vorverdichtung des Einbaumaterials vorgeordnet ist. Beim Beginn eines Einbauvorganges kommt es nun vor, dass das bituminöse, in warmem Zustand befindliche Mischgut an der kalten Stampferleiste kleben bleibt. Das an der Stampferleiste klebende Mischgut hinterlässt jedoch Rillen in dem Belag, die von der nachfolgenden Glättbohle nicht mehr beseitigt werden können und daher auf der Oberfläche der Fahrbahndecke verbleiben. Zur Vermeidung dieser Rillen beim Beginn eines Einbauvorganges ist es bekannt, die Stampferleiste zu beheizen. Die Verwendung eines Gasbrenners wurde dabei ersetzt durch eine elektrische Heizung, die in ein offenes oder geschlossenes Hohlprofil, das die Stampferleiste bildet, eingesetzt ist. Die elektrische Heizung befindet sich dann im Inneren der Stampferleiste.Such a device is known from DE 26 00 108 A1. On the paver then a screed is attached, which is preceded by a rammer for pre-compression of the paving material. At the beginning of an installation process, it now happens that the bituminous mixture, which is in a warm state, sticks to the cold ramming bar. However, the adhesive material adhering to the ramming bar leaves grooves in the lining, which can no longer be removed by the subsequent screed and therefore remain on the surface of the road surface. To avoid these grooves at the beginning of an installation process, it is known to heat the tamper strip. The use of a gas burner was replaced by an electric heater, which in an open or closed Hollow profile, which forms the tamper strip is inserted. The electric heater is then inside the tamper strip.
Aus EP 0 641 887 B1 ist ein Deckenfertiger und Werkzeug als Stampferleiste für eine Einbaubohle bekannt. Die Stampferleiste bildet zwischen einem Trägerteil und einem Verschleißteil einen Kanal, in dem ein Heizelement, insbesondere ein Heizstab, vorgesehen ist. Das Heizelement ist ein elektrischer Flachrohrheizkörper, der durch eine Beilage nach oben abgeschirmt ist. Die Beilage stellt dabei sicher, dass das Heizelement festgeklemmt ist, so dass sich eine möglichst große Kontaktfläche für die Wärmeleitung ergibt. Nachteilig hierbei ist, dass das Heizelement häufig bricht. Der Austausch eines defekten Heizelementes führt zu unerwünschten Stillstandszeiten des Straßenfertigers. Der Wartungsaufwand ist zudem erhöht.From EP 0 641 887 B1 a paver and tool as a tamper strip for a screed is known. The tamper strip forms a channel between a support part and a wearing part, in which a heating element, in particular a heating element, is provided. The heating element is a flat electric heating element, which is shielded by an insert upwards. The supplement ensures that the heating element is clamped, so that there is the largest possible contact surface for the heat conduction. The disadvantage here is that the heating element breaks frequently. The replacement of a defective heating element leads to undesirable downtime of the paver. The maintenance effort is also increased.
Aufgabe der Erfindung ist es daher, eine Vorrichtung zum Verdichten von Straßenbaustoffen nach dem Oberbegriff des Anspruchs 1 zu schaffen, deren Wartungsaufwand durch defekte Heizelemente reduziert ist.The object of the invention is therefore to provide a device for compacting road construction materials according to the preamble of claim 1, the maintenance of which is reduced by defective heating elements.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved by the features of claim 1.
Hierdurch wird eine Stampferleiste mit einem elektrischen Heizelement geschaffen, dessen Befestigung mittels Klemmung durch elastische Verformung erfolgt. Ein statisch wirkender Energiespeicher wird unter Ausnutzung der elastischen Formänderung angewendet. Die beispielsweise von menschlicher Muskelkraft herrührende Energie beim Einsetzen des Heizelementes in die Ausnehmung der Stampferleiste wird so in geeigneter Weise gespeichert. Das Energiespeicherelement wirkt dabei erfindungsgemäß in Richtung der schlagenden Auf- und Abwärtsbewegung zum Lagern des Heizelementes. Das Heizelement wird so innerhalb der Stampferleiste auf der Länge gestützt und befestigt. In einem schlagenden Stampfer muss das Heizelement aus rein mechanischen Gründen gegen Schwingungen gesichert werden. Das Heizelement ist deshalb vor Vibration geschützt. Befestigungen durch Schrauben sind nicht notwendig, da die Federwirkung auch im heizenden Zustand des Heizelementes erhalten bleibt.As a result, a tamper strip is provided with an electric heating element, the attachment is carried out by means of clamping by elastic deformation. A statically acting energy storage is used by utilizing the elastic deformation. The originating example of human muscle energy when inserting the heating element in the recess of the tamper bar is stored in a suitable manner. The energy storage element acts according to the invention in the direction of the beating up and down movement for supporting the heating element. The heating element is thus supported and fixed within the tamper strip on the length. In a hammering rammer, the heating element must be secured against vibrations for purely mechanical reasons. The heating element is therefore protected against vibration. Fastenings by screws are not necessary because the spring action is maintained even in the heating state of the heating element.
Besondere Vorteile der erfindungsgemäßen Selbstklemmung liegen in einem einfachen, schnellen Wechsel des Heizelementes. Wärmespannungen über der Länge des Heizelementes werden vermieden und damit die Bruchgefahr des Heizelementes deutlich verringert. Weiterhin sind weniger Befestigungselemente erforderlich, d.h. weniger Fertigungs- und Montageaufwand besteht.Particular advantages of the self-clamping according to the invention lie in a simple, rapid change of the heating element. Thermal stresses over the length of the heating element are avoided, thus significantly reducing the risk of breakage of the heating element. Furthermore, fewer fasteners are required, i. less manufacturing and assembly costs.
Vorzugsweise ist das Heizelement als Heizstab in gewellter Form bzw. zickzackartiger Form ausgeführt. Zur Befestigung wird die federnde Eigenschaft des Heizstabes ausgenutzt. Dieser kann sich durch belastete Wellung in dem Stampfer selbstständig klemmen.Preferably, the heating element is designed as a heating rod in corrugated or zigzag-like shape. For attachment, the resilient property of the heating element is utilized. This can be clamped by loaded corrugation in the rammer independently.
Alternativ ist die Verformung eines im unbelasteten Zustand geraden Heizstabes durch geeignete Widerlage, wie beispielsweise eine gewellte Beilage, möglich, um die nötige Klemmkraft aufzubringen.Alternatively, the deformation of a straight in the unloaded condition heating rod by suitable abutment, such as a corrugated shim, possible to apply the necessary clamping force.
Das Heizelement kann dabei als Flachrohrheizkörper oder Rundrohrheizkörper ausgebildet sein. Erfindungsgemäß wurde überraschend festgestellt, dass der Rundrohrheizkörper das Heizvermögen des Flachrohrheizkörpers einhält.The heating element can be designed as a flat tubular heater or round tubular heater. According to the invention it has surprisingly been found that the round tubular heater complies with the heating capacity of Flachrohrheizkörpers.
Die Verwendung eines Rundrohrheizkörpers ist bei gleicher Heizleistung kostengünstiger als die Verwendung von Flachrohrheizkörpern.The use of a round tubular heater is cheaper for the same heat output than the use of Flachrohrheizkörpern.
Innerhalb von Rundrohrheizkörpern wird üblicherweise nur eine Heizwendel verlegt. Vorzugsweise wird der Heizstab am Ende umgelegt und zurückgeführt. Dies ermöglicht die Verwendung nur einer Anschlusshülse. Durch diese Gestaltung des runden Heizkörpers ist es möglich, die Ausnehmung sehr klein zu halten. Der Rundrohrheizstab hat somit die gleichen geometrischen Vorteile wie ein Flachrohrheizstab. Vorzugsweise ist die Stampferleiste eine horizontal geteilte Konstruktion, die eine Trag- und eine Schlagleiste aufweist. Vorzugsweise innerhalb der Tragleiste ist eine Nut vorgesehen, in der sich das Heizelement befindet. Nach Verschleißen der Schlagleiste kann so die Tragleiste an der Maschine verbleiben und weiter verwendet werden. Die Nut befindet sich somit nicht im verschleißenden Teil. Durch diese Wahl können die Schlagleisten kostengünstig gehalten werden. Die Schlagleisten können dabei mehrteilig ausgebildet und mittels eines Deckblechs überbrückt sein. Die Anschlussflächen werden hierdurch abgedichtet.Within round tubular heaters usually only one heating coil is laid. Preferably, the heating element is folded over at the end and returned. This allows the use of only one ferrule. By this design of the round radiator, it is possible to keep the recess very small. The Rundrohrheizstab thus has the same geometric advantages as a Flachrohrheizstab. Preferably, the tamper strip is a horizontally split construction having a support and a blow bar. Preferably within the support bar a groove is provided in which the heating element is located. After wearing the blow bar so the support bar can remain on the machine and continue to be used. The groove is thus not in the wear part. By choosing this, the blow bars can be kept inexpensive. The blow bars can be designed in several parts and bridged by a cover plate. The connection surfaces are thereby sealed.
Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.
Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.The invention will be explained in more detail with reference to the embodiments illustrated in the accompanying drawings.
Fig. 1a zeigt eine schematische Seitenansicht eines Deckenfertigers,1a shows a schematic side view of a paver,
Fig. 1 b zeigt schematisch eine Schnittdarstellung einer Glättbohle,1 b schematically shows a sectional view of a screed,
Fig. 2 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem ersten Ausführungsbeispiel,2 shows schematically in section a tamper strip according to a first embodiment,
Fig. 3 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem zweiten Ausführungsbeispiel,3 shows schematically in section a tamper strip according to a second embodiment,
Fig. 4 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem dritten Ausführungsbeispiel,4 shows schematically in section a tamper strip according to a third embodiment,
Fig. 5 zeigt schematisch einen Schnitt A-A gemäß Fig. 4,5 shows schematically a section A-A according to FIG. 4,
Fig. 6 zeigt schematisch einen Schnitt gemäß Fig. 4 beim Einsetzen des Heizelementes,6 shows schematically a section according to FIG. 4 during insertion of the heating element, FIG.
Fig. 7 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem vierten Ausführungsbeispiel,7 shows schematically in section a tamper strip according to a fourth exemplary embodiment,
Fig. 8 zeigt schematisch einen Schnitt C-C gemäß Fig. 7,8 shows schematically a section C-C according to FIG. 7,
Fig. 9 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem fünften Ausführungsbeispiel,Fig. 9 shows schematically in section a tamper strip according to a fifth Embodiment,
Fig. 10 zeigt schematisch einen Schnitt D-D gemäß Fig. 9,10 shows schematically a section D-D according to FIG. 9,
Fig. 11 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem sechsten Ausführungsbeispiel,11 shows schematically in section a tamper strip according to a sixth embodiment,
Fig. 12 zeigt schematisch einen Schnitt E-E gemäß Fig. 11 ,FIG. 12 shows schematically a section E-E according to FIG. 11, FIG.
Fig. 13 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem siebtenFig. 13 shows schematically in section a tamper strip according to a seventh
Ausführungsbeispiel,Embodiment,
Fig. 14 zeigt schematisch einen Schnitt F-F gemäß Fig. 13,14 shows schematically a section F-F according to FIG. 13,
Fig. 15 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem achtenFig. 15 shows schematically in section a tamper strip according to an eighth
Ausführungsbeispiel,Embodiment,
Fig. 16 zeigt schematisch einen Schnitt G-G gemäß Fig. 15,16 schematically shows a section G-G according to FIG. 15, FIG.
Fig. 17 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem neunten Ausführungsbeispiel,17 shows schematically in section a tamper strip according to a ninth embodiment,
Fig. 18 zeigt schematisch einen Schnitt H-H gemäß Fig. 17.FIG. 18 schematically shows a section H-H according to FIG. 17.
Der Straßenfertiger 1 gemäß Fig. 1 a umfasst ein Fahrwerk 2, ein Antriebsaggregat 3, einen in Fahrtrichtung vorne liegenden Gutbunker 4 und eine hintenliegende Verteilerschnecke 5. Mit seitlichen Auslegern 6 wird eine Glättbohle 7 geschleppt, die aus dem Gutbunker 4 nach hinten transportiertes, von der Verteilerschnecke 5 verteiltes Einbaugut einbaut. Die Glättbohle 7 ist vorzugsweise eine Vibrationsbohle, die glättet und verdichtet. An der in Fahrtrichtung F vorne liegenden Seite der Einbaubohle 7 ist mindestens ein Stampfer 8 angeordnet, wie in Fig. 1 b dargestellt ist. Nach Fig. 1b sind zwei Stampfer 8 hintereinander angeordnet. Es handelt sich demnach um eine Doppelstampfer-Bohle. Ein Stampfer 8 kann ferner auch der Glättbohle 7 nachgeordnet sein. Die Glättbohle 7 kann mit fester Arbeitsbreite oder für größere Arbeitsbreiten als Auszieh-Bohle seitlich verlängerbar sein. Der in Fahrtrichtung F vor der Glättbohle 7 angeordnete Stampfer 8 arbeitet als Vorverdichtungselement.The paver 1 of FIG. 1 a comprises a chassis 2, a drive unit 3, a front in the direction of travel Gutbunker 4 and a rear auger 5. With lateral arms 6 a screed 7 is towed, which transported from the Gutbunker 4 to the rear, from the auger 5 built-in built-in. The screed 7 is preferably a vibration screed that smoothes and compacts. At the front in the direction of travel F front of the screed 7 at least one rammer 8 is arranged, as shown in Fig. 1 b. According to Fig. 1b two rammers 8 are arranged one behind the other. It is therefore a Doppelstampfer screed. A rammer 8 may also be arranged downstream of the screed 7. The screed 7 can be laterally extendable with a fixed working width or for larger working widths as an extendable screed. The arranged in the direction of travel F in front of the screed 7 ram 8 operates as a precompression element.
Die Fig. 1a und 1 b zeigen somit eine Vorrichtung zum Verdichten von Straßenbaustoffen mit einer an einem Straßenfertiger 1 befestigten, quer zur Arbeitsrichtung des Fertigers 1 verlaufenden Glättbohle 7 und einem derselben vorgeordneten Stampfer 8. Der nachfolgend beschriebene Stampfer 8 kann vorzugsweise zusätzlich oder alternativ der Glättbohle 7 nachgeordnet sein.FIGS. 1a and 1b thus show a device for compacting road building materials with a fastened to a paver 1, transversely to the direction of work of the paver 1 extending screed 7 and one of the same upstream rammer 8. The rammer described below 8 may preferably additionally or alternatively the screed 7 be arranged downstream.
Der Stampfer 8 weist eine für eine schlagende Auf- und Abwärtsbewegung antreibbare Stampferleiste 9 auf. Für den Antrieb der Stampferleiste 9 ist ein Antrieb 10 vorgesehen.The rammer 8 has a tamper strip 9 which can be driven for a striking upward and downward movement. For driving the tamper strip 9, a drive 10 is provided.
Wie Fig. 2 zeigt, ist das Innere der Stampferleiste 9 mit einer elektrischen Heizung in Form eines stabförmigen, in einer Ausnehmung 11 der Stampferleiste 9 klemmbaren Heizelementes 12 ausgerüstet. Die Ausnehmung 11 bildet einen umschlossenen Raum für das Heizelement 12. Zum Klemmen des Heizelementes 12 ist ein das Heizelement 12 in Richtung der schlagenden Auf- und Abwärtsbewegung S lagernder Federspeicher vorgesehen. Der Federspeicher bewirkt eine Klemmung durch elastische Verformung. Der Federspeicher klemmt das Heizelement 12 längs der Ausnehmung 11 derart, dass das Heizelement 12 stabilisiert bzw. spielfrei in der Ausnehmung 11 liegt. Die Wärmeausdehnung des Heizelementes 12 in Richtung eines freien Endes 13 ist gegeben. Das erfindungsgemäße Klemmen des Heizelementes 12 durch Verspannen ohne Anlenkung vermeidet Brüche des Heizelementes 12. Die Ausnehmung 11 kann einen runden oder kantigen Querschnitt aufweisen, sie kann von einer Kernbohrung gebildet werden oder sie kann als verschlossene Nut ausgebildet sein.As shown in FIG. 2, the interior of the tamper strip 9 is equipped with an electric heater in the form of a rod-shaped, in a recess 11 of the tamper strip 9 clampable heating element 12. The recess 11 forms an enclosed space for the heating element 12. For clamping the heating element 12, a heating element 12 is provided in the direction of the beating up and down movement S stored spring accumulator. The spring accumulator causes a clamping by elastic deformation. The spring accumulator clamps the heating element 12 along the recess 11 such that the heating element 12 is stabilized or free of play in the recess 11. The thermal expansion of the heating element 12 in the direction of a free end 13 is given. The inventive clamping of the heating element 12 by bracing without articulation avoids fractures of the heating element 12. The recess 11 may have a round or angular cross-section, it may be formed by a core hole or it may be formed as a closed groove.
Wie Fig. 3 zeigt, ist ein Austausch des Heizelementes 12 außerdem merklich einfacher, wenn dieses nur an der Stirnseite des Stampfers 8 über einen Anschlussblock 14 befestigt ist. Das Lösen von Klemmschrauben, die vorher von Einbaumaterialien befreit werden müssen, entfällt. Der Stillstand der Maschine zum Austausch des Heizelementes 12 ist dadurch deutlich verkürzt. Das Heizelement 12 ist über den Anschlussblock 14 elektrisch angeschlossen an eine Stromquelle, wofür ein Anschlusskabel 19 vorgesehen ist. Der Anschlussblock 14 ist an der Stampferleiste 9 befestigt. Das Heizelement 12 ist vorzugsweise als gewellter, geknickter oder zickzackförmiger Heizstab ausgebildet, dessen elastische Formänderung den Federspeicher bildet. Das Heizelement 12 sitzt elastisch vorgespannt in der Ausnehmung 11 der Stampferleiste 9. Die Ausnehmung 11 , die sich längs der Stampferleiste 9 erstreckt, besitzt somit Abmessungen, insbesondere in der Höhe und in der Breite, die die elastische Verformung des Heizelementes 12 und damit die Vorspannung bestimmt (vgl. Fig. 6). Die elastische Formänderung des Heizelementes 12 wird ausgenutzt, wozu die Stärke der Wellung oder der Zickzackform des Heizstabes in Bezug auf die Ausnehmung 11 gewählt wird. Fig. 6 zeigt beispielsweise die von der menschlichen Muskelkraft herrührende Energie (beim Einsetzen des Heizelementes 12) zum Aufbau des statisch wirkenden Federspeichers unter Ausnutzung der elastischen Formänderung. Das eigenständige Klemmen von Heizstäben als Heizelemente 12 ist unabhängig von der Rohrform. Das Heizelement 12 kann von einem Flachrohrheizkörper, einem Rundrohrheizkörper oder Patronenheizstab gebildet werden.As shown in FIG. 3, replacement of the heating element 12 is also noticeably easier if it is fastened only on the front side of the rammer 8 via a connection block 14. The loosening of clamping screws, which must be previously freed of paving materials, is eliminated. The standstill of the machine for replacement of the heating element 12 is significantly reduced. The heating element 12 is electrically connected via the terminal block 14 to a power source, for which a connection cable 19 is provided. The terminal block 14 is attached to the tamper strip 9. The heating element 12 is preferably formed as a corrugated, kinked or zigzag-shaped heating element whose elastic shape change forms the spring accumulator. The heating element 12 is seated elastically biased in the recess 11 of the tamper strip 9. The recess 11 extending along the tamper strip 9 thus has dimensions, in particular in height and in width, the elastic deformation of the heating element 12 and thus the bias determined (see Fig. 6). The elastic deformation of the heating element 12 is exploited, to which the strength of the corrugation or the zigzag shape of the heating element is selected with respect to the recess 11. For example, Fig. 6 shows the energy derived from human muscle power (at the onset of heating element 12) to build up the statically acting spring accumulator utilizing elastic deformation. The independent terminals of heating elements as heating elements 12 is independent of the tube shape. The heating element 12 may be formed by a flat-tube heating element, a round-tube heating element or cartridge heating element.
Gemäß Fig. 2 ist das Heizelement 12 als Flachrohrheizkörper ausgebildet. Gemäß Fig. 3 ist das Heizelement 12 als Rundrohrheizkörper ausgebildet. Die Anzahl Wellen der Knickstellen 15, 16, 17, 18 kann variieren. Mindestens eine Knickstelle ist jedoch erforderlich. Die Achse der Knickung kann variieren. Gemäß Fig. 2 und 3 befinden sich die Knickstellen in einer Ebene. Dies ist aber nicht zwingend erforderlich, wie nachfolgend zu den Fig. 7 bis 18 noch ausgeführt wird.According to Fig. 2, the heating element 12 is formed as a flat tubular heater. According to FIG. 3, the heating element 12 is designed as a round tubular heater. The number of waves of kinks 15, 16, 17, 18 may vary. At least one kink is required. The axis of the buckling can vary. According to FIGS. 2 and 3, the kinks are in one plane. However, this is not absolutely necessary, as will be explained below with reference to FIGS. 7 to 18.
Neben der Treppenform der Knickstellen ist auch eine spiralförmige Formung wählbar. Jegliche Abweichung von der geraden Form ermöglicht ein Klemmen in der Ausnehmung 11 , solange die räumliche Ausdehnung des Heizelementes 12 vor dem Einsetzen in die Ausnehmung 11 größer ist als der zur Verfügung stehende Raum der Ausnehmung 11 nach dem Einsetzen, d.h. die Ausbildung eines Federspeichers. Fig. 6 zeigt das Einsetzen eines Heizelementes 12 in die Ausnehmung 11 der Stampferleiste 9. Andererseits kann auch die Ausnehmung 11 räumlich gekrümmt sein. Hierbei wird ein ursprünglich gerader Heizstab als Heizelement 12 durch die Montage in eine gekrümmte Form gebracht mit dem Ergebnis einer eigenständigen Klemmung. Auch kann die Krümmung des Heizstabes um eine Achse mit einer in einer anderen Achse gekrümmten Ausnehmung kombiniert werden. Die federnde Klemmwirkung kann schließlich auch von dem eigentlichen Heizelement 12 getrennt sein. Dabei wird eine zusätzliche, nicht beheizte Beilage in Wellen- oder Knickform genutzt, um das Heizelement 12 zu klemmen, wie in Fig. 15, 16 dargestellt ist.In addition to the staircase shape of the kinks, a spiral shape can also be selected. Any deviation from the straight shape allows clamping in the recess 11, as long as the spatial extent of the heating element 12 before insertion into the recess 11 is greater than the available space of the recess 11 after insertion, ie the formation of a spring accumulator. FIG. 6 shows the insertion of a heating element 12 into the recess 11 of the tamper strip 9. On the other hand, the recess 11 may be spatially curved. Here, an originally straight heating element is brought as a heating element 12 by the assembly in a curved shape with the result of an independent clamping. Also, the curvature of the heating element can be combined around an axis with a curved recess in another axis. Finally, the resilient clamping effect can also be separated from the actual heating element 12. In this case, an additional, unheated insert in wave or kink shape is used to clamp the heating element 12, as shown in Fig. 15, 16.
Wie Fig. 3 zeigt, ist das Heizelement 12 vorzugsweise als Rundrohrheizstab ausgebildet. Dieser Rundrohrheizstab weist nur eine Heizwendel 20 auf, deren freies Ende 13 umgelegt und zurückgeführt ist. Anfang 21 und Ende 22 der einen Heizwendel 20 sind an den einen Anschlussblock 14 angeschlossen und befestigt. Durch die Verwendung eines Rundrohrheizstabes mit umgelegter Heizwendel 20 ist die Ausnehmung 11 klein ausbildbar. Die dadurch verminderte Konvektion liefert ein großes Einsparpotential an Verlustwärme zugunsten von Wärmeleitung und Wärmestrahlung. Die Heizwendel 20 überträgt Wärme auf die Stampferleiste 9, wobei der Kontakt zur Stampferleiste 9 nicht mehr vorrangig ist wie bei Flachrohrheizkörpern. Die umgelegte Heizwendel 20 bildet ein Heizpaket mit zwei über- oder nebeneinander angeordneten Stäben der Heizwendel 20 eines Rundrohrheizkörpers, die in einem gemeinsamen Anschlussblock 14 mit einer elektrischen Zuleitung 19 verbunden sind.As shown in FIG. 3, the heating element 12 is preferably formed as Rundrohrheizstab. This Rundrohrheizstab has only one heating coil 20, the free end 13 is folded and returned. Beginning 21 and end 22 of a heating coil 20 are connected to the one terminal block 14 and fastened. By using a Rundrohrheizstabes with folded heating coil 20, the recess 11 can be formed small. The resulting reduced convection provides a great savings potential for heat loss in favor of heat conduction and heat radiation. The heating coil 20 transfers heat to the tamper strip 9, wherein the contact with the tamper strip 9 is no longer a priority as in Flachrohrheizkörpern. The folded heating coil 20 forms a heating package with two superimposed or juxtaposed rods of the heating coil 20 of a round tubular heater, which are connected in a common terminal block 14 with an electrical lead 19.
Die gemäß Fig. 3 vorgesehenen vier Knickstellen 15, 16, 17, 18 sind so gewählt, dass das Heizelement 12 genug Federspannung aufbaut, um sich während des Betriebs des Stampfers 8 ausreichend in der Stampferleiste 9 festzuklemmen. Das Heizelement 12 hat vorzugsweise eine gute Biegeeigenschaft, damit dieses eine eigene elastische Verformung zulässt.The provided in accordance with FIG. 3 four kinks 15, 16, 17, 18 are selected so that the heating element 12 builds enough spring tension to clamp during the operation of the rammer 8 sufficiently in the tamper strip 9. The heating element 12 preferably has a good bending property, so that this allows its own elastic deformation.
Gemäß Fig. 3 umfasst die Stampferleiste 9 vorzugsweise eine Tragleiste 23 und eine Schlagleiste 24. Die Stampferleiste 9 ist damit horizontal geteilt. Zur Ausbildung der Ausnehmung 11 in einem umschlossenen Raum der Stampferleiste 9 ist vorzugsweise in der Tragleiste 23 eine Nut 25, in der sich das Heizelement 12 befindet. Die Nut 25 ist über eine Kopffläche 26 der Schlagleiste 24 geschlossen zur Ausbildung der Ausnehmung 11. Nach einem Verschleißen der Schlagleiste 24 kann die Tragleiste 23 am Fertiger 1 verbleiben und weiter verwendet werden. Die Nut 25 kann somit in einem nicht verschleißenden Teil angebracht werden.According to FIG. 3, the tamper strip 9 preferably comprises a support strip 23 and a beater bar 24. The tamper strip 9 is thus divided horizontally. To the training of Recess 11 in an enclosed space of the tamper strip 9 is preferably in the support bar 23 has a groove 25 in which the heating element 12 is located. The groove 25 is closed by a top surface 26 of the beater bar 24 to form the recess 11. After a wear of the beater bar 24, the support bar 23 remain on the paver 1 and continue to be used. The groove 25 can thus be mounted in a non-wearing part.
Die Schlagleiste 24 kann aus mehreren Schlagleistensegmenten bestehen. Die Schlagleiste 24 kann beispielsweise mindestens zwei hintereinander angeordnete Schlagleistensegmente aufweisen. Die Schlagleistensegmente können durch ein Deckblech überbrückt sein. Das Deckblech kann dann die Kopffläche 26 zur Begrenzung der Ausnehmung 11 bilden.The blow bar 24 may consist of several blow bar segments. The blow bar 24, for example, have at least two consecutively arranged blow bar segments. The blow bar segments can be bridged by a cover plate. The cover plate can then form the top surface 26 for limiting the recess 11.
Die Schlagleiste 24 ist ferner vorzugsweise als dünnwandiges Profil ausgebildet. Die Tragleiste 23 ist als Tragkörper an die Einsatzbedingungen anpassbar. Die Befestigung des Stampfers 8 an dem Antrieb 10 erfolgt beispielsweise über Arme 28, 29 an der Stampferleiste 9.The blow bar 24 is also preferably formed as a thin-walled profile. The support bar 23 is adaptable as a supporting body to the conditions of use. The attachment of the rammer 8 to the drive 10, for example, via arms 28, 29 on the tamper strip. 9
Die nachfolgenden Ausführungsbeispiele in den Schemazeichungen der Fig. 4 bis Fig. 18 zeigen das elektrische Heizelement 12 in der Ausnehmung 11 der Stampferleiste 9. Die jeweilige Befestigung durch Klemmung muss einerseits sicherstellen, dass das Heizelement 12 bezüglich der auftretenden Schwingungen ausreichend fixiert ist, andererseits muss die aus der Wärmeausdehnung des Heizelementes 12 resultierende Relativbewegung zwischen dem Heizelement 12 und der Ausnehmung 11 möglich sein.The following exemplary embodiments in the schematic drawings of FIGS. 4 to 18 show the electrical heating element 12 in the recess 11 of the tamper strip 9. The respective fastening by clamping must on the one hand ensure that the heating element 12 is sufficiently fixed with respect to the vibrations occurring, on the other hand the resulting from the thermal expansion of the heating element 12 relative movement between the heating element 12 and the recess 11 may be possible.
Fig. 4 und Fig. 5 zeigen die Stampferleiste 9 gemäß Fig. 3 mit zwei übereinander angeordneten Stäben der Heizwendel 20 eines Rundrohrheizkörpers. Die Ausnehmung 11 wird stirnseitig der Stampferleiste 9 durch den Anschlussblock 14 verschlossen. Wie Fig. 6 zeigt, ist vor dem Einbau das Heizelement 12 stärker geknickt als im montierten Zustand. Während der Montage, beispielsweise durch Anwendung menschlicher Muskelkraft, wird das Heizelement 12 seitlich in die Nut 25 zwischen Tragleiste 23 und Schlagleiste 24 geschoben. Währenddessen verformt sich das Heizelement 12 elastisch und gegebenenfalls anteilig plastisch soweit in eine vorgespannte Form, dass es die Nut 25 ausfüllt. Der Anteil der elastischen Verformung bewirkt die Klemmung. Die Länge der Ausnehmung 11 ist derart bemessen, dass sich das Heizelement 12 zum freien Ende durch gleitende Bewegung ausdehnen kann. Wie Fig. 5 zeigt, ist das Heizelement 12 im geschlossenen System der Ausnehmung 11 vollkommen von der Stampferleiste umhüllt. Kein direkter Kontakt zwischen Heizelement 12 als Rundrohrheizkörper und Schlagleiste 24 ist erforderlich. Die Oberflächentemperatur des Rundrohrheizkörpers erhöht sich im Vergleich zu einem Flachrohrheizkörper mit Kontakt. Der Rundrohrheizkörper ist für diese höhere Temperatur geeignet. Der Anteil des Wärmestroms aus der verringerten Kontaktwärmeübertragung des Rundrohrheizkörpers verteilt sich folglich insbesondere auf die Wärmestrahlung und die Konvektion als Wärmeübertragungsarten.Fig. 4 and Fig. 5 show the tamper strip 9 of FIG. 3 with two superposed rods of the heating coil 20 of a round tubular heater. The recess 11 is closed at the front side of the tamper strip 9 by the connection block 14. As shown in FIG. 6, prior to installation, the heating element 12 is more kinked than in the assembled state. During assembly, for example through Application of human muscle power, the heating element 12 is pushed laterally into the groove 25 between support bar 23 and beater bar 24. Meanwhile, the heating element 12 deforms elastically and possibly proportionally plastically far enough in a prestressed form that it fills the groove 25. The proportion of elastic deformation causes the clamping. The length of the recess 11 is dimensioned such that the heating element 12 can expand to the free end by sliding movement. As shown in FIG. 5, the heating element 12 is completely enclosed by the tamper strip in the closed system of the recess 11. No direct contact between heating element 12 as a round tubular heater and blow bar 24 is required. The surface temperature of the round tubular heater increases in comparison to a flat tubular heater with contact. The round tube heater is suitable for this higher temperature. The proportion of the heat flow from the reduced contact heat transfer of the round tubular heater is thus distributed in particular to the heat radiation and the convection as heat transfer types.
Fig. 7 und Fig. 8 zeigen ein Ausführungsbeispiel für ein Heizelement 12 mit einem Rundrohrheizkörper, das sich von Fig. 4 dadurch unterscheidet, dass die Wellung bzw. Knickung kürzer ausgebildet ist.Fig. 7 and Fig. 8 show an embodiment of a heating element 12 with a round tubular heating element, which differs from Fig. 4 in that the curl or buckling is shorter.
Fig. 9 und Fig. 10 zeigen ein Ausführungsbeispiel für ein Heizelement 12 mit einem Rundrohrheizkörper, der quer zur Schlagrichtung geklemmt ist, in dem die Heizwendel 20 horizontal gewellt oder geknickt ist. Eine Knickstelle 18 ist dargestellt. Die Heizwendel 20 liegt nach Art einer Schlange auf der Kopffläche 26 der Schlagleiste 24.Fig. 9 and Fig. 10 show an embodiment of a heating element 12 with a round tubular heating element, which is clamped transversely to the direction of impact, in which the heating coil 20 is corrugated or kinked horizontally. A kink 18 is shown. The heating coil 20 is in the manner of a snake on the top surface 26 of the blow bar 24th
Fig. 11 und Fig. 12 zeigen ein Ausführungsbeispiel mit zwei nebeneinander angeordneten Stäben der Heizwendel 20. Der Federspeicher lagert auch hier das Heizelement 12 in Schlagrichtung S. Fig. 13 und Fig. 14 zeigen ein Ausführungsbeispiel für ein Heizelement 12 mit einem Rundrohrheizkörper, der quer zur Schlagrichtung geklemmt ist, vergleichbar Fig. 9 und Fig. 10. Die beiden Stäbe der Heizwendel 20 liegen hier übereinander und nicht nebeneinander.11 and FIG. 12 show an exemplary embodiment with two bars of the heating coil 20 arranged next to one another. The spring store here also stores the heating element 12 in the direction of impact S. FIGS. 13 and 14 show an exemplary embodiment of a heating element 12 with a round tubular heating element which is clamped transversely to the direction of impact, comparable to FIGS. 9 and 10. The two rods of the heating coil 20 lie above one another and not next to each other.
Gemäß Fig. 15 und Fig. 16 ist als Federspeicher eine gewellte oder geknickte Beilage 27 vorgesehen, deren elastische Formänderung den Federspeicher bildet. Die federnde Klemmwirkung ist hier von dem eigentlichen Heizelement 12 getrennt. Die Beilage 27 ist ein zusätzliches, vorzugsweise nicht beheiztes Element in Wellenoder Knickform, das das Heizelement 12 klemmt.According to FIG. 15 and FIG. 16, a corrugated or kinked insert 27 is provided as a spring store, the elastic deformation of which forms the spring accumulator. The resilient clamping action is here separated from the actual heating element 12. The supplement 27 is an additional, preferably unheated element in wave or buckling shape, which clamps the heating element 12.
Gemäß Fig. 17 und 18 ist anstelle einer Treppenform eine spiralförmige Formung der Heizwendel 20 vorgesehen. According to Fig. 17 and 18, a helical shaping of the heating coil 20 is provided instead of a staircase shape.

Claims

Patentansprüche claims
1. Vorrichtung zum Verdichten von Straßenbaustoffen mit einer an einem Straßenfertiger (1 ) befestigten, quer zur Arbeitsrichtung des Fertigers (1 ) verlaufenden Glättbohle (7) und einem derselben vorgeordneten und/oder nachgeordneten Stampfer (8), der eine für eine schlagende Auf- und Abwärtsbewegung (S) antreibbare Stampferleiste (9) aufweist, die im Innern mit einer elektrischen Heizung in Form eines stabförmigen, in einer Ausnehmung (11 ) der Stampferleiste (9) klemmbaren Heizelementes (12) ausgerüstet ist, dadurch gekennzeichnet, dass zum Klemmen des Heizelementes (12) ein das Heizelement (12) in Richtung der schlagenden Auf- und Abwärtsbewegung lagernder Federspeicher vorgesehen ist.1. A device for compacting road building materials with a screed (7) attached to a paver (1) and running transversely to the working direction of the paver (1) and a rammer (8) arranged upstream of it and / or downstream. and downward movement (S) drivable tamper strip (9), which is equipped in the interior with an electric heater in the form of a rod-shaped, in a recess (11) of the tamper strip (9) clampable heating element (12), characterized in that for clamping the Heating element (12) is provided a heating element (12) in the direction of the bouncing up and down movement stored spring accumulator.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Federspeicher durch elastische Verformung gebildet ist.2. Device according to claim 1, characterized in that the spring accumulator is formed by elastic deformation.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Federspeicher das Heizelement (12) längs der Ausnehmung (11 ) derart klemmt, dass es spielfrei in der Ausnehmung (11 ) liegt.3. Apparatus according to claim 1 or 2, characterized in that the spring store, the heating element (12) along the recess (11) clamped such that it is free of play in the recess (11).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Heizelement (12) als gewellter oder zickzackförmiger Heizstab ausgebildet ist, dessen elastische Formänderung den Federspeicher bildet.4. Device according to one of claims 1 to 3, characterized in that the heating element (12) is formed as a corrugated or zigzag-shaped heating element whose elastic deformation forms the spring accumulator.
5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Federspeicher als gewellte oder zickzackförmige Beilage (27) ausgebildet ist, deren elastische Formänderung den Federspeicher bildet.5. Device according to one of claims 1 to 3, characterized in that the spring accumulator is formed as a corrugated or zigzag-shaped insert (27) whose elastic shape change forms the spring accumulator.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Heizelement (12) ein Flachrohrheizkörper ist. 6. Device according to one of claims 1 to 5, characterized in that the heating element (12) is a flat tubular heater.
7. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Heizelement (12) ein Rundrohrheizkörper ist.7. Device according to one of claims 1 to 5, characterized in that the heating element (12) is a round tubular heater.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der Rundrohrheizkörper ein einstangiges, an seinem freien Ende umgelegtes Heizstabpaket ist.8. The device according to claim 7, characterized in that the round tube heating element is a one-level, at its free end folded Heizstabpaket.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Heizstabpaket zwei über- oder nebeneinander angeordnete Stangen eines Rundrohrheizkörpers aufweist.9. Apparatus according to claim 8, characterized in that the Heizstabpaket has two over or juxtaposed rods of a round tubular heater.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Stampferleiste (9) eine Tragleiste (23) und eine Schlagleiste (24) aufweist.10. Device according to one of claims 1 to 9, characterized in that the tamper strip (9) has a support strip (23) and a blow bar (24).
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass in der Tragleiste (23) die Ausnehmung (11 ) zur Aufnahme des Heizelementes (12) ausgebildet ist.11. The device according to claim 10, characterized in that in the support strip (23), the recess (11) for receiving the heating element (12) is formed.
12. Vorrichtung nach Anspruch 11 , dadurch gekennzeichnet, dass die Tragleiste (23) eine Nut (25) aufweist, die über eine Kopffläche (26) der Schlagleiste (24) geschlossen ist zur Ausbildung der Ausnehmung (11 ).12. The apparatus according to claim 11, characterized in that the support strip (23) has a groove (25) which is closed by a head surface (26) of the blow bar (24) for forming the recess (11).
13. Vorrichtung nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass die Schlagleiste (24) mindestens zwei hintereinander angeordnete Schlagleistensegmente aufweist.13. Device according to one of claims 10 to 12, characterized in that the blow bar (24) has at least two successively arranged blow bar segments.
14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Schlagleistensegmente durch ein Deckblech überbrückt sind.14. The apparatus according to claim 13, characterized in that the blow bar segments are bridged by a cover plate.
15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass das Deckblech die Kopffläche (26) zur Begrenzung der Ausnehmung (11 ) bildet. 15. The apparatus according to claim 14, characterized in that the cover plate forms the head surface (26) for limiting the recess (11).
16. Vorrichtung nach einem der Ansprüche 10 bis 15, dadurch gekennzeichnet, dass die Schlagleiste (24) als dünnwandiges Profil ausgebildet ist. 16. Device according to one of claims 10 to 15, characterized in that the blow bar (24) is designed as a thin-walled profile.
EP09706938A 2008-02-02 2009-01-06 Device for compacting road paving materials Active EP2235264B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008007308A DE102008007308B3 (en) 2008-02-02 2008-02-02 Apparatus for compacting road building materials
PCT/EP2009/000025 WO2009095145A1 (en) 2008-02-02 2009-01-06 Device for compacting road paving materials

Publications (2)

Publication Number Publication Date
EP2235264A1 true EP2235264A1 (en) 2010-10-06
EP2235264B1 EP2235264B1 (en) 2012-09-12

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EP09706938A Active EP2235264B1 (en) 2008-02-02 2009-01-06 Device for compacting road paving materials

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US (1) US8113737B2 (en)
EP (1) EP2235264B1 (en)
CN (1) CN101932771B (en)
DE (1) DE102008007308B3 (en)
WO (1) WO2009095145A1 (en)

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Also Published As

Publication number Publication date
CN101932771A (en) 2010-12-29
EP2235264B1 (en) 2012-09-12
US8113737B2 (en) 2012-02-14
US20110002737A1 (en) 2011-01-06
DE102008007308B3 (en) 2009-08-13
CN101932771B (en) 2012-10-10
WO2009095145A1 (en) 2009-08-06

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