EP0013946B1 - Apparatus for mixing asphalt-aggregate compositions - Google Patents

Apparatus for mixing asphalt-aggregate compositions Download PDF

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Publication number
EP0013946B1
EP0013946B1 EP80100229A EP80100229A EP0013946B1 EP 0013946 B1 EP0013946 B1 EP 0013946B1 EP 80100229 A EP80100229 A EP 80100229A EP 80100229 A EP80100229 A EP 80100229A EP 0013946 B1 EP0013946 B1 EP 0013946B1
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EP
European Patent Office
Prior art keywords
rotary drum
minerals
drum
mix
binder
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EP80100229A
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German (de)
French (fr)
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EP0013946A1 (en
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Carl-Hermann Heise
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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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/105—Mixing or coating by a combination of methods covered by E01C19/1018 - E01C19/104, excluding E01C19/1036
    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1031—Mixing in a rotary receptacle the mixture being discharged continuously
    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1036—Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
    • 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
    • E01C19/02—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 preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow

Definitions

  • the invention relates to a device for processing bituminous mix with a removal device for minerals, a mixing device for adding thermoplastic binder and a fired rotating drum provided with internals.
  • Such a device is known from CH-A No. 567628.
  • the minerals are extracted from the corresponding silos using an extraction device.
  • the minerals should have a certain moisture and are additionally showered with water if there is insufficient moisture.
  • This aggregate with the bitumen and possibly the water is passed into a mixing drum which is heated from one end in a known manner by a burner.
  • Liquid or gaseous fuels are preferably used.
  • Special cascade throughput of the mix is achieved through special built-in components in the rotating drum. The mix is heated in cocurrent from the flue gases and via the radiant heat of the open flame of the burner.
  • the addition of water to the minerals is disadvantageous because the water has to be evaporated again at least in part.
  • a residual water content in the mix can also lead to frost damage, especially in the cold season.
  • the addition of water to the minerals also causes affinity deficiencies, i.e. the adhesion between the thermoplastic binder, for example bitumen, and the minerals is deteriorated.
  • DE-B No. 2617839 shows a device for processing bituminous mix with a rotating drum fired in direct current, which is divided into different areas with different tasks and properties. Special fittings are provided in the feed area to protect the minerals from dust formation and dust separation. In the subsequent blending area, bitumen is injected and the still moist minerals are mixed with the binder. In the process according to DE-B No.
  • the first process step is limited to the mixing of the binder with the mineral which has not yet been heated, with regard to the thermoplastic behavior of the binder, which is essentially spherical with a small binding surface and binding quality the still moist mineral particles accumulate, ie Thus, only a statistical distribution of the binder takes place, while in the second process step the minerals are heated and the essential water content is to be evaporated, the binder being intended to take on the function of water with regard to the binding of the dust particles to the rock particles.
  • the mineral material is circulated so strongly in the feed area that an unwanted premature drying occurs even before it is mixed with the binder.
  • DE-A No. 2635933 shows a device for reprocessing asphalt / aggregate mixtures, in which an axially arranged direct burner upstream of this or a radially upstream indirect burner is used in connection with a drying drum.
  • a heat barrier and at the beginning of the drying drum a distribution plate with openings arranged in a distributed manner are provided for the axial introduction of the hot gases into the drum.
  • the drum has lifting bars as internals.
  • DE-A No. 2101004 shows an apparatus for producing asphalt mix, in which a drying drum is preceded by a mixer in the form of a two-shaft trough mixer. Drying drum and mixer form two axially plug-in units. This arrangement is possible if axially on the forehead side of the drying drum, the space required for this is available.
  • the invention has for its object to develop a device of the type described above so that the mix can be largely dust-free and inexpensive to produce.
  • the affinity between the binder and the minerals must be improved, but at the same time the mixture must be heated gently so that overheating of the thermoplastic binder and premature curing are prevented.
  • a hot gas generator is provided for the known indirect firing of the rotating drum, which is arranged tangentially opening into the rotating drum, and in that the internals of the rotating drum are designed in a helical fashion for guiding the hot gases and the mixed material and to the tangential junction the hot gases are adapted.
  • the sensitive thermoplastic binder is not overheated. There is no risk of self-ignition. This also gives the opportunity to reprocess broken asphalt or other mix that has already been laid.
  • the tangential junction of the hot gas generator on the rotating drum enables longer distances for the hot gas in the drum, i.e. longer contact times with a short design. Existing dusts in the hot gas have the opportunity to combine with the bituminous mix and accumulate on it.
  • the radial component of the hot gas flow supports this separation effect.
  • the screw-shaped internals guide part of the mix in the area of the drum wall, so that it is gently processed.
  • a preferably continuously operated compulsory mixer can be provided for adding the thermoplastic binder before it enters the rotary drum.
  • This compulsory mixer brings mechanical contact between the binder and the minerals. This mechanical mixing and action results in an excellent affinity, even with a certain residual moisture in the minerals that are used undried.
  • the compulsory mixer can also be provided so as to protrude centrally into the rotary drum on the end face. This is possible because the hot gas is introduced tangentially, so that the end face of the rotary drum is free for the arrangement of the compulsory mixer.
  • the mixing of the binder and the minerals then takes place in the warm zone, so that the inherently harmful cooling of the binder is counteracted. There is no dust when mixing because the minerals are coated with the binder.
  • the compulsory mixer is indirectly heated by the hot gas generator, so that the hot gas can already give off part of its heat to the mix.
  • the interaction of the mechanical stirring movement in the compulsory mixer, the thermal heating and the subsequent further mixing with trickling effect in the rotating drum is of particular importance.
  • a conveyor for minerals not mixed with thermoplastic binder can be provided in parallel to the compulsory mixer. This results in the possibility of introducing a portion of the minerals, especially the coarser minerals, into the rotary drum without binding agents, while the finer minerals are passed through the compulsory mixer and the dust is bound with a relatively high binder content, so that one such a facility eliminates filter systems for cleaning the hot gases.
  • the parallel arrangement of this conveying device can be used both when the compulsory mixer is arranged in the end face of the rotary drum and when the compulsory mixer is somehow connected upstream of the rotary drum as a separate unit in the material flow.
  • additional lifting boxes or those with increased output can be provided on the rotary drum, in order to use the long contact times due to the tangential confluence of the hot gases particularly effectively.
  • the rotary drum 1 shows the rotary drum 1 with its end face 2.
  • a compulsory mixer 3 with the two shafts 4 is accommodated centrally in this end face 2.
  • the compulsory mixer 3 has a housing 5 enclosing it.
  • the rotary drum 1 has internally screw-shaped internals 6, which also leave an axial passage channel 7 free.
  • the helical internals 6 are attached to the inner circumference of the rotary drum 1.
  • a hot gas generator 8 also opens with a connecting pipe 9. The rotary drum 1 is therefore heated indirectly.
  • the relative position of the details to one another can be seen particularly well from FIG. It can be seen how the compulsory mixer 3 protrudes centrally into the end face of the rotary drum 1 and to a certain extent into the rotary drum. stretched in.
  • the compulsory mixer 3 has an inlet 10 for the minerals and an inlet 11 for the bitumen.
  • the helical internals 6 are particularly well recognizable by the sectional view. The material is cascaded here and in the screw threads leads through the drum moves, whereby the drum can have a comparatively short overall length.
  • the exhaust gases are discharged according to arrow 13, while a discharge belt 14 is provided for the processed bituminous mix.
  • FIG. 3 shows a section through the rotary drum 1 with the screw-shaped internals 6 and the additional lifting boxes 15, which are not shown in FIG. 2 for the sake of simplicity.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Road Paving Machines (AREA)
  • Coke Industry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

1. Equipment for the preparation of bituminous mixes, having a discharge device for minerals, a mixing device for the addition of thermoplastic binder and a rotary drum which is fired and provided with inserts, characterized in that, for the indirect firing of the rotary drum (1), known per se, a hot-gas generator (8) is provided which is arranged to lead tangentially into the rotary drum (1), and that the inserts (6) in the rotary drum are formed helically in order to guide the hot gases and the mix and are adapted to the tangentiel entry of the hot gases.

Description

Die Erfindung bezieht sich auf eine Einrichtung zum Aufbereiten von bituminösem Mischgut mit einer Abzugseinrichtung für Mineralien, einer Mischeinrichtung zum Hinzufügen von thermoplastischem Bindemittel und einer befeuerten, mit Einbauten versehenen Drehtrommel.The invention relates to a device for processing bituminous mix with a removal device for minerals, a mixing device for adding thermoplastic binder and a fired rotating drum provided with internals.

Eine derartige Einrichtung ist aus der CH-A Nr. 567628 bekannt. Dabei werden die Mineralien aus entsprechenden Silos mit einer Abzugseinrichtung abgezogen. Die Mineralien sollen eine gewisse Feuchtigkeit aufweisen und werden bei ungenügender Feuchtigkeit zusätzlich mit Wasser abgeduscht. Dieser Zuschlag mit dem Bitumen und ggf. dem Wasser wird in eine Mischtrommel geleitet, die von der einen Stirnseite her in bekannter Weise durch einen Brenner beheizt wird. Vorzugsweise finden flüssige oder gasförmige Brennstoffe Verwendung. Durch spezielle Einbauten in der Drehtrommel wird ein kaskadenförmiger Durchsatz des Mischgutes erzielt. Das Mischgut wird dabei im Gleichstrom von den Rauchgasen und über die Strahlungswärme der offenen Flamme des Brenners erwärmt. Die Hinzufügung von Wasser zu den Mineralien ist jedoch nachteilig, weil das Wasser zumindest teilweise wieder verdampft werden muss. Auch ein im Mischgut vorhandener Restwassergehalt kann insbesondere in der kalten Jahreszeit zu Frostschäden führen. Die Hinzufügung von Wasser zu den Mineralien bewirkt auch Affinitätsmängel, d.h. die haftung zwischen dem thermoplastischen Bindemittel, beispielsweise Bitumen, und den Mineralien wird verschlechtert.Such a device is known from CH-A No. 567628. The minerals are extracted from the corresponding silos using an extraction device. The minerals should have a certain moisture and are additionally showered with water if there is insufficient moisture. This aggregate with the bitumen and possibly the water is passed into a mixing drum which is heated from one end in a known manner by a burner. Liquid or gaseous fuels are preferably used. Special cascade throughput of the mix is achieved through special built-in components in the rotating drum. The mix is heated in cocurrent from the flue gases and via the radiant heat of the open flame of the burner. However, the addition of water to the minerals is disadvantageous because the water has to be evaporated again at least in part. A residual water content in the mix can also lead to frost damage, especially in the cold season. The addition of water to the minerals also causes affinity deficiencies, i.e. the adhesion between the thermoplastic binder, for example bitumen, and the minerals is deteriorated.

Aus der US-A Nr. 3423222 ist es bereits bekannt, den Zuschlag, also die Mineralien, zunächst ohne Anfeuchtung in eine Drehtrommel zu leiten. Die Drehtrommel wird mit einem Brenner beheizt und im Gegenstromverfahren betrieben. Innerhalb der Drehtrommel wird erhitztes Bitumen mit erhitztem, teilweise dampfförmigen Wasser eingedüst. Dabei kommen etwa 5 bis 15% Wasser und 85 bis 95% Bindemittel gleichzeitig zur Anwendung. Das Wasser dient dem Zweck, den Staub der in der Drehtrommel bewegten Mineralien zu binden, das Bitumen zu kühlen und somit vor einer Zündung und einer vorzeitigen Aushärtung zu schützen. Es ist weiter vorgesehen, zusätzlich zu dem Wasser und dem Bindemittel noch additive und andere Umhüllungshilfen in die Drehtrommel einzubringen.From US-A No. 3423222 it is already known to first pass the aggregate, ie the minerals, into a rotating drum without moistening. The rotary drum is heated with a burner and operated in a counterflow process. Inside the rotating drum, heated bitumen is injected with heated, partially vaporized water. About 5 to 15% water and 85 to 95% binder are used simultaneously. The purpose of the water is to bind the dust of the minerals moving in the rotary drum, to cool the bitumen and thus to protect it from ignition and premature curing. In addition to the water and the binder, it is also provided to add additive and other coating aids to the rotary drum.

Die DE-B Nr. 2617839 zeigt eine Einrichtung zum Aufbereiten von bituminösem Mischgut mit einer im Gleichstrom befeuerten Drehtrommel, die in verschiedene Bereiche mit unterschiedlichen Aufgaben und Eigenschaften eingeteilt ist. Im Einzugsbereich sind spezielle Einbauten vorgesehen, um die Mineralien vor Staubbildung und Staubabscheidung zu schützen. Im anschliessenden Vermengungsbereich wird Bitumen eingedüst und dabei die noch feuchten Mineralien mit dem Bindemittel vermengt. Auch bei dem Verfahren nach der DE-B Nr. 1594815 beschränkt sich der erste Verfahrensschritt auf die Vermengung des Bindemittels mit dem noch nicht erhitzten Mineral, wobei sich im Hinblick auf das thermoplastische Verhalten des Bindemittels dieses im wesentlichen in Kugelform mit geringer Bindefläche und Bindequalität an die noch feuchten Mineralpartikel anlagert, d.h. also lediglich eine statistische Verteilung des Bindemittels stattfindet, während im zweiten Verfahrensschritt die Mineralstoffe erhitzt und der wesentliche Wasseranteil verdampft werden soll, wobei das Bindemittel hinsichtlich der Bindung der Staubpartikel an die Gesteinspartikel die Funktion des Wassers übernehmen soll. Bei einer ähnlichen Einrichtung, die aus der DE-B Nr. 2102328 bekannt ist, findet im Einzugsbereich jedoch eine derart starke Umwälzung des Mineralgutes statt, dass eine ungewollte vorzeitige Trocknung sich bereits vor der Vermengung mit dem Bindemittel einstellt. Dies bedeutet einen erhöhten Staubanfall durch die vorzeitige Aufhebung der Wasserbindung des Staubes an die Gesteinsteilchen und eine eingeschränkte Affinität zwischen Bindemittel und Gestein. Auch hier kann auf Umhüllungshilfen, wie beispielsweise Chromsalze oder Bariumsulfid, in der Regel nicht verzichtet werden.DE-B No. 2617839 shows a device for processing bituminous mix with a rotating drum fired in direct current, which is divided into different areas with different tasks and properties. Special fittings are provided in the feed area to protect the minerals from dust formation and dust separation. In the subsequent blending area, bitumen is injected and the still moist minerals are mixed with the binder. In the process according to DE-B No. 1594815, too, the first process step is limited to the mixing of the binder with the mineral which has not yet been heated, with regard to the thermoplastic behavior of the binder, which is essentially spherical with a small binding surface and binding quality the still moist mineral particles accumulate, ie Thus, only a statistical distribution of the binder takes place, while in the second process step the minerals are heated and the essential water content is to be evaporated, the binder being intended to take on the function of water with regard to the binding of the dust particles to the rock particles. In a similar device, which is known from DE-B No. 2102328, the mineral material is circulated so strongly in the feed area that an unwanted premature drying occurs even before it is mixed with the binder. This means an increased accumulation of dust due to the premature removal of the water binding of the dust to the rock particles and a limited affinity between the binder and the rock. Here, too, it is generally not possible to do without coating aids, such as chromium salts or barium sulfide.

Die DE-A Nr. 2635933 zeigt eine Vorrichtung zur Wiederaufbereitung von Asphalt/Zuschlagstoff-Gemischen, bei der in Verbindung mit einer Trockentrommel ein dieser vorgeschalteter axial angeordneter direkter Brenner oder auch ein radial vorgeschalteter indirekter Brenner Verwendung findet. Im letzteren Fall sind zur Begrenzung der Flammen des Brenners auf den Brennraum eine Hitzesperre und am Anfang der Trockentrommel eine Verteilerplatte mit verteilt angeordneten öffnungen zum axialen Einleiten der heissen Gase in die Trommel vorgesehen. Die Trommel besitzt Hebeleisten als Einbauten.DE-A No. 2635933 shows a device for reprocessing asphalt / aggregate mixtures, in which an axially arranged direct burner upstream of this or a radially upstream indirect burner is used in connection with a drying drum. In the latter case, to limit the flames of the burner to the combustion chamber, a heat barrier and at the beginning of the drying drum a distribution plate with openings arranged in a distributed manner are provided for the axial introduction of the hot gases into the drum. The drum has lifting bars as internals.

Aus der DE-C Nr. 838451 ist eine Vorrichtung bekannt, mit der auch bituminöses Mischgut hergestellt werden kann. In einem mit einem Brenner ausgestatteten Ofen ist dabei eine Trommel angeordnet und angetrieben, die aus drei ineinander gesteckten und miteinander verbundenen Zylindern besteht. Die Einbauten dieser Drehtrommel bestehen aus archimedischen Schrauben, die im wesentlichen eine Führung des Mischgutes bewirken. Da die Trommel im Ofen angeordnet ist und in der äusseren Trommelwandung Öffnungen für den Übertritt der vom Brenner erzeugten heissen Gase vorgesehen sind, wird bei dieser Einrichtung der Wärmeinhalt der heissen Gase wie auch die Strahlungswärme der Flamme zur Trocknung des Materials ausgenutzt.From DE-C No. 838451 a device is known with which bituminous mix can also be produced. In a furnace equipped with a burner, a drum is arranged and driven, which consists of three cylinders which are inserted into one another and connected to one another. The internals of this rotary drum consist of Archimedean screws, which essentially guide the mix. Since the drum is arranged in the furnace and openings are provided in the outer drum wall for the passage of the hot gases generated by the burner, the heat content of the hot gases and the radiant heat of the flame are used to dry the material in this device.

Die DE-A Nr. 2101004 zeigt eine Vorrichtung zum Herstellen von Asphaltmischgut, bei der einer Trocknungstrommel ein Mischer in Form eines Zwei-Wellen-Trogmischers vorgeschaltet ist. Trocknungstrommel und Mischer bilden zwei axial ineinander steckbare Baueinheiten. Diese Anordnung ist dann möglich, wenn axial an der Stirnseite der Trockentrommel der erforderliche Platz hierzu zur Verfügung steht.DE-A No. 2101004 shows an apparatus for producing asphalt mix, in which a drying drum is preceded by a mixer in the form of a two-shaft trough mixer. Drying drum and mixer form two axially plug-in units. This arrangement is possible if axially on the forehead side of the drying drum, the space required for this is available.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung der eingangs beschriebenen Art so weiterzubilden, dass sich das Mischgut weitgehend staubfrei und kostengünstig herstellen lässt. Dabei muss die Affinität zwischen Bindemittel und Mineralien verbessert werden, aber gleichzeitig die Erwärmung des Mischgutes schonend erfolgen, damit Überhitzungserscheinungen des thermoplastischen Bindemittels und ein vorzeitiges Aushärten verhindert werden.The invention has for its object to develop a device of the type described above so that the mix can be largely dust-free and inexpensive to produce. The affinity between the binder and the minerals must be improved, but at the same time the mixture must be heated gently so that overheating of the thermoplastic binder and premature curing are prevented.

Erfindungsgemäss wird dies dadurch erreicht, dass für die an sich bekannte indirekte Befeuerung der Drehtrommel ein Heissgaserzeuger vorgesehen ist, der tangential in die Drehtrommel einmündend angeordnet ist, und dass die Einbauten der Drehtrommel zwecks Führung der Heissgase und des Mischgutes schraubengangförmig ausgebildet und an die tangentiale Einmündung der Heissgase angepasst sind. Durch die Verwendung eines Heissgaserzeugers kommt die Strahlungswärme der offenen Flamme in Wegfall, so dass das Mischgut schonend erwärmt wird.This is achieved according to the invention in that a hot gas generator is provided for the known indirect firing of the rotating drum, which is arranged tangentially opening into the rotating drum, and in that the internals of the rotating drum are designed in a helical fashion for guiding the hot gases and the mixed material and to the tangential junction the hot gases are adapted. By using a hot gas generator, the radiant heat of the open flame is eliminated, so that the mix is gently heated.

Das empfindliche thermoplastische Bindemittel wird nicht überhitzt. Es besteht keine Selbstentzündungsgefahr. Damit ist auch die Möglichkeit gegeben, aufgebrochenen Asphalt oder anderes, bereits verlegtes Mischgut wieder aufzubereiten. Durch die tangentiale Einmündung des Heissgaserzeugers an der Drehtrommel werden längere Wege des Heissgases in der Trommel ermöglicht, also längere Kontaktzeiten bei kurzer Bauweise. Vorhandene Stäube im Heissgas haben Gelegenheit, sich mit dem bituminösen Mischgut zu verbinden und an dieses anzulagern. Die Radialkomponente der Heissgasströmung unterstützt diese Abscheidewirkung. Die schraubengangförmigen Einbauten führen einen Teil des Mischgutes im Bereich der Trommelwandung, so dass hier eine schonende Aufbereitung gegeben ist.The sensitive thermoplastic binder is not overheated. There is no risk of self-ignition. This also gives the opportunity to reprocess broken asphalt or other mix that has already been laid. The tangential junction of the hot gas generator on the rotating drum enables longer distances for the hot gas in the drum, i.e. longer contact times with a short design. Existing dusts in the hot gas have the opportunity to combine with the bituminous mix and accumulate on it. The radial component of the hot gas flow supports this separation effect. The screw-shaped internals guide part of the mix in the area of the drum wall, so that it is gently processed.

Mit besonderem Vorteil kann ein vorzugsweise kontinuierlich betriebener Zwangsmischer für die Hinzufügung des thermoplastischen Bindemittels vor dem Eintritt in die Drehtrommel vorgesehen sein. Dieser Zwangsmischer bringt einen mechanischen Kontakt zwischen dem Bindemittel und den Mineralien. Es ergibt sich durch diese mechanische Vermengung und Einwirkung eine ausgezeichnete Affinität, selbst bei einer gewissen Restfeuchte der Mineralien, die ungetrocknet eingesetzt werden. Der Zwangsmischer kann auch zentral an der Stirnseite in die Drehtrommel einragend vorgesehen sein. Dies wird möglich, weil das Heissgas tangential eingeleitet wird, so dass die Stirnseite der Drehtrommel für die Anordnung des Zwangsmischers frei ist. Die Vermischung des Bindemittels und der Mineralien erfolgt dann schon in der warmen Zone, so dass der an sich schädlichen Abkühlung des Bindemittels entgegengewirkt wird. Beim Mischen entsteht kein Staubanfall, weil eine Umhüllung der Mineralien mit dem Bindemittel stattfindet. Gleichzeitig wird der Zwangsmischer durch den Heissgaserzeuger indirekt beheizt, so dass das Heissgas schon hier einen Teil seiner Wärme an das Mischgut abgeben kann. Von besonderer Bedeutung ist die Zusammenwirkung der mechanischen Rührbewegung im Zwangsmischer, der thermischen Aufheizung und der anschliessenden Weitermischung mit Rieseleffekt in der Drehtrommel.With particular advantage, a preferably continuously operated compulsory mixer can be provided for adding the thermoplastic binder before it enters the rotary drum. This compulsory mixer brings mechanical contact between the binder and the minerals. This mechanical mixing and action results in an excellent affinity, even with a certain residual moisture in the minerals that are used undried. The compulsory mixer can also be provided so as to protrude centrally into the rotary drum on the end face. This is possible because the hot gas is introduced tangentially, so that the end face of the rotary drum is free for the arrangement of the compulsory mixer. The mixing of the binder and the minerals then takes place in the warm zone, so that the inherently harmful cooling of the binder is counteracted. There is no dust when mixing because the minerals are coated with the binder. At the same time, the compulsory mixer is indirectly heated by the hot gas generator, so that the hot gas can already give off part of its heat to the mix. The interaction of the mechanical stirring movement in the compulsory mixer, the thermal heating and the subsequent further mixing with trickling effect in the rotating drum is of particular importance.

Parallel zu dem Zwangsmischer kann eine Fördereinrichtung für nicht mit thermoplastischem Bindemittel versetzte Mineralien vorgesehen sein. Damit ergibt sich die Möglichkeit, einen Teil der Mineralien, insbesondere die groberen Mineralien, ohne Bindemittel vermengt in die Drehtrommel einzubringen, während die feineren Mineralien durch den Zwangsmischer geleitet werden und dabei der Staub mit einem relativ hohen Bindemittelanteil gebunden wird, so dass sich bei einer solchen Einrichtung Filteranlagen zur Reinigung der Heissgase erübrigen. Die parallele Anordnung dieser Fördereinrichtung kann sowohl dann eingesetzt werden, wenn der Zwangsmischer in der Stirnseite der Drehtrommel angeordnet ist als auch dann, wenn der Zwangsmischer als separates Aggregat im Materialfluss der Drehtrommel irgendwie vorgeschaltet ist.A conveyor for minerals not mixed with thermoplastic binder can be provided in parallel to the compulsory mixer. This results in the possibility of introducing a portion of the minerals, especially the coarser minerals, into the rotary drum without binding agents, while the finer minerals are passed through the compulsory mixer and the dust is bound with a relatively high binder content, so that one such a facility eliminates filter systems for cleaning the hot gases. The parallel arrangement of this conveying device can be used both when the compulsory mixer is arranged in the end face of the rotary drum and when the compulsory mixer is somehow connected upstream of the rotary drum as a separate unit in the material flow.

Zur Erhöhung der Förderwirkung und des Rieseleffektes des Mischgutes können an der Drehtrommel zusätzliche Hubkästen oder solche mit vergrösserter Leistung vorgesehen sein, um auf diese Weise die langen Kontaktzeiten infolge tangentialer Einmündung der Heissgase besonders effektiv auszunutzen.To increase the conveying effect and the trickling effect of the material to be mixed, additional lifting boxes or those with increased output can be provided on the rotary drum, in order to use the long contact times due to the tangential confluence of the hot gases particularly effectively.

Die Erfindung wird anhand eines bevorzugten Ausführungsbeispieles weiter beschrieben. Es zeigen:

  • Fig.1 eine schematisierte Stirnansicht der Einrichtung,
  • Fig. 2 eine schematisierte Seitenansicht der Einrichtung, grösstenteils geschnitten, und
  • Fig. 3 einen Querschnitt durch die Drehtrommel.
The invention is further described on the basis of a preferred exemplary embodiment. Show it:
  • 1 is a schematic front view of the device,
  • Fig. 2 is a schematic side view of the device, mostly cut, and
  • Fig. 3 shows a cross section through the rotary drum.

Fig. 1 zeigt die Drehtrommel 1 mit ihrer Stirnseite 2. Zentral in dieser Stirnseite 2 ist ein Zwangsmischer 3 mit den beiden Wellen 4 untergebracht. Der Zwangsmischer 3 besitzt ein ihn umschliessendes Gehäuse 5. Die Drehtrommel 1 besitzt in ihrem Innern schraubengangförmige Einbauten 6, die zudem einen axialen Durchtrittskanal 7 freilassen. Die schraubengangförmigen Einbauten 6 sind auf dem inneren Umfang der Drehtrommel 1 befestigt. Im Bereich der einen Stirnseite 2, in der der Zwangsmischer 3 gelagert ist, mündet auch ein Heissgaserzeuger 8 mit einem Anschlussrohr 9 ein. Die Drehtrommel 1 wird also indirekt beheizt.1 shows the rotary drum 1 with its end face 2. A compulsory mixer 3 with the two shafts 4 is accommodated centrally in this end face 2. The compulsory mixer 3 has a housing 5 enclosing it. The rotary drum 1 has internally screw-shaped internals 6, which also leave an axial passage channel 7 free. The helical internals 6 are attached to the inner circumference of the rotary drum 1. In the area of the one end face 2, in which the compulsory mixer 3 is mounted, a hot gas generator 8 also opens with a connecting pipe 9. The rotary drum 1 is therefore heated indirectly.

Aus Fig. 2 ist die relative Lage der Einzelheiten zueinander besonders gut erkennbar. Es ist ersichtlich, wie der Zwangsmischer 3 zentral in die Stirnseite der Drehtrommel 1 hineinragt und sich um ein gewisses Mass in die Drehtrommel. hineinerstreckt. Der Zwangsmischer 3 besitzt einen Einlass 10 für die Mineralien und einen Einlass 11 für das Bitumen. Durch die Schnittdarstellung sind die schraubengangförmigen Einbauten 6 besonders gut erkennbar. Das Material wird hier kaskadenförmig und in den Schraubengängen geführt durch die Trommel bewegt, wodurch die Trommel eine vergleichsweise geringe Baulänge aufweisen kann. An der anderen Stirnseite 12 der Drehtrommel 1 werden die Abgase gemäss Pfeil 13 abgeführt, während für das aufbereitete bituminöse Mischgut ein Abzugsband 14 vorgesehen ist.The relative position of the details to one another can be seen particularly well from FIG. It can be seen how the compulsory mixer 3 protrudes centrally into the end face of the rotary drum 1 and to a certain extent into the rotary drum. stretched in. The compulsory mixer 3 has an inlet 10 for the minerals and an inlet 11 for the bitumen. The helical internals 6 are particularly well recognizable by the sectional view. The material is cascaded here and in the screw threads leads through the drum moves, whereby the drum can have a comparatively short overall length. At the other end 12 of the rotary drum 1, the exhaust gases are discharged according to arrow 13, while a discharge belt 14 is provided for the processed bituminous mix.

Fig. 3 zeigt einen Schnitt durch die Drehtrommel 1 mit den schraubengangförmigen Einbauten 6 und den zusätzlichen Hubkästen 15, die der Einfachheit halber in Fig. 2 nicht dargestellt sind.FIG. 3 shows a section through the rotary drum 1 with the screw-shaped internals 6 and the additional lifting boxes 15, which are not shown in FIG. 2 for the sake of simplicity.

Claims (5)

1. Equipment for the preparation of bituminous mixes, having a discharge device for minerals, a mixing device for the addition of thermoplastic binder and a rotary drum which is fired and provided with inserts, characterised in that, for the indirect firing of the rotary drum (1), known per se, a hot-gas generator (8) is provided which is arranged to lead tangentially into the rotary drum (1), and that the inserts (6) in the rotary drum are formed helically in order to guide the hot gases and the mix and are adapted to the tangential entry of the hot gases.
2. Equipment according to claim 1, characterised in that a forced mixer (3), preferably operated continuously, is provided for the addition of the thermoplastic binder before the entry into the rotary drum.
3. Equipment according to claim 1, characterised in that a forced mixer (3), preferably operated continuously, is provided, projecting into the rotary drum (1) centrally on the end face (2).
4. Equipment according to claim 2 or 3, characterised in that, parallel to the forced mixer (3), a conveyor device is provided for minerals to which thermoplastic binder has not been added.
5. Equipment according to claim 1, characterised in that, for increasing the conveying effect and the flow effect of the mix, additional lift boxes (15), or lift boxes of increased performance, are provided on the rotary drum.
EP80100229A 1979-01-29 1980-01-18 Apparatus for mixing asphalt-aggregate compositions Expired EP0013946B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80100229T ATE3161T1 (en) 1979-01-29 1980-01-18 EQUIPMENT FOR PROCESSING BITUMINOUS MIX.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2903235A DE2903235C2 (en) 1979-01-29 1979-01-29 Device for processing bituminous mix
DE2903235 1979-01-29

Publications (2)

Publication Number Publication Date
EP0013946A1 EP0013946A1 (en) 1980-08-06
EP0013946B1 true EP0013946B1 (en) 1983-04-27

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ID=6061588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80100229A Expired EP0013946B1 (en) 1979-01-29 1980-01-18 Apparatus for mixing asphalt-aggregate compositions

Country Status (5)

Country Link
EP (1) EP0013946B1 (en)
JP (1) JPS55102683A (en)
AT (1) ATE3161T1 (en)
DE (1) DE2903235C2 (en)
DK (1) DK33780A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106347C2 (en) * 1981-02-20 1986-09-25 Reinhard 5461 Windhagen Wirtgen Device for the production of loadable, heated paving material for coating road surfaces
US5320585A (en) * 1989-11-06 1994-06-14 Fukuyama Gomu Kogyo Kabushiki Kaisha Endless track belt assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE838451C (en) * 1950-02-21 1952-05-08 Camille Gabriel Henri Rieux Apparatus for warm wrapping of comminuted or powdery materials
US3423222A (en) * 1965-05-10 1969-01-21 Kenneth E Mcconnaughay Method of making a paving composition
FR1516830A (en) * 1966-12-02 1968-02-05 Coating products and processes using plastic and hydraulic binders
DE2101004A1 (en) * 1971-01-11 1972-07-27 Huther & Co, 6521 Bechtheim Method and device for the manufacture of asphalt mix
CH567628A5 (en) * 1973-05-25 1975-10-15 Pavements Systems Inc
US3999743A (en) * 1975-08-11 1976-12-28 Mendenhall Robert Lamar Asphalt-aggregate recycle process and apparatus
DE2617839C3 (en) * 1976-04-23 1979-01-18 Wibau (Westdeutsche Industrie- Und Strassenbau-Maschinen-Gesellschaft Mbh), 6466 Gruendau Device for processing bituminous mix with a rotating drum fired in direct current

Also Published As

Publication number Publication date
ATE3161T1 (en) 1983-05-15
DE2903235B1 (en) 1980-07-24
DK33780A (en) 1980-07-30
JPS55102683A (en) 1980-08-06
EP0013946A1 (en) 1980-08-06
DE2903235C2 (en) 1981-03-12

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