EP0562234B1 - Misch-Trocken-Trommel für die kontinuierliche Aufbereitung von bituminösem Mischgut unter Wiederverwendung von rückgewonnenem Material - Google Patents

Misch-Trocken-Trommel für die kontinuierliche Aufbereitung von bituminösem Mischgut unter Wiederverwendung von rückgewonnenem Material Download PDF

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Publication number
EP0562234B1
EP0562234B1 EP93101297A EP93101297A EP0562234B1 EP 0562234 B1 EP0562234 B1 EP 0562234B1 EP 93101297 A EP93101297 A EP 93101297A EP 93101297 A EP93101297 A EP 93101297A EP 0562234 B1 EP0562234 B1 EP 0562234B1
Authority
EP
European Patent Office
Prior art keywords
drum
drier
cylinder
reclaimed
aggregates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93101297A
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English (en)
French (fr)
Other versions
EP0562234A1 (de
Inventor
Antonio Cipriani
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.)
Marini SpA
Original Assignee
MATRA Srl
Marini SpA
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Filing date
Publication date
Application filed by MATRA Srl, Marini SpA filed Critical MATRA Srl
Publication of EP0562234A1 publication Critical patent/EP0562234A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • E01C19/02—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
    • E01C2019/1086—Mixing containers having concentric drums
    • 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
    • E01C2019/109—Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow

Definitions

  • the present invention relates to a drum mixer-drier for the continuous preparation of bituminous mixes with recycling of reclaimed materials, as defined in the preamble of the appended claim 1 and as disclosed in EP-A-0 347 281.
  • Drier-mixers of the described type (hereinafter termed simply “mixers” for the sake of brevity in description) are already known. They comprise a drum with internal blades which rotates about an axis which is slightly inclined with respect to a horizontal plane; the aggregates are introduced at the upper end of the drum and, by means of the rotation of the drum, move toward the opposite lower end, where the discharge outlet is located. A burner, orientated along the axis of the drum, is arranged in said upper end and dries and heats the aggregates.
  • the bitumen inlet is located at a certain distance from the burner; the bitumen, with the addition of additives, is mixed together with the aggregates.
  • the bitumen inlet is located at a distance from the burner which is sufficient to avoid the formation of fumes.
  • the inlet for the reclaimed material generally constituted by mixes which originate from the demolition of old paving. This reclaimed material (recyclable asphalt pavement, hereinafter abbreviated as RAP) is mixed with the aggregates and the bitumen.
  • a drawback of the known mixers is the difficulty encountered in heating the aggregates to a high temperature while at the same time preventing the bitumen and the RAP from reaching temperatures which cause the formation of fumes.
  • a technical aim of the present invention is therefore to provide a drier-mixer which obviates the above described problems related to the exposure of bitumen and RAP to excessive heat.
  • the mixer is generally designated by the reference numeral 1 and comprises a base 2 which may be mounted on wheels for the transfer of the mixer to the work site.
  • a drum 3 is mounted on the base for rotation about the axis A.
  • the axis A is slightly inclined with respect to the horizontal plane, so that the drum has an uppermost or upper end 4 and a lower end 5.
  • the drum proximate to the ends 4 and 5, there are two hoops or annular flanges 6 and 7 which constitute two rolling tracks engaged by pairs of rollers 8 and 9 on which the drum rolls.
  • the rollers 8 and 9 are rotatable in appropriate supports fixed to the base.
  • the rotation of the drum is produced by a gearmotor 10 which is fixed to the base and is provided with an output pinion 11 on which a chain 12 is entrained; said chain is also entrained around a toothed wheel 13 which is fixed to the outside of the drum 3, thus defining a closed-loop formation.
  • the reference numeral 14 designates a cylinder which is arranged concentrically around the lower portion of the drum and defines, together with said drum, an annular interspace 15.
  • the cylinder 14 is rigidly coupled to the base 2, on which it rests by means of lateral feet 16, and comprises two flanges 17 and 18 which are at right angles to the axis A and have an annular crown shape; the inner edge of the flanges 17,18 skims or slidingly contacts the outer surface of the drum 3 so as to close the interspace 15 at its opposite ends.
  • the upper end 4 of the drum is closed by a fume expansion chamber 19, outside which a hopper 20 for feeding the aggregates is fitted; said aggregates are introduced in the drum through an opening of the chamber 19.
  • the drum is furthermore connected, by means of an opening 21 of the fume expansion chamber, to a stack 22 for aspirating the volatile substances and the dust which form during preparation of the bituminous mix.
  • RAP reclaimed material
  • the RAP is introduced into the drum through a funnel 23 which leads into an annular duct 24 located at a preset distance from the flange 18 of the cylinder 14.
  • the annular duct 24 defines, around the drum, an annular chamber 25 in which blades 26 rotate; said blades are fixed to the outside of the drum 3.
  • Openings 27 are defined on the drum between the blades 26 and allow the RAP to pass inside the drum during its rotation.
  • the blades 26 are rigidly coupled to the drum 3 at the annular chamber 25 along a band 30 which is as wide as said chamber and defines recesses 28a.
  • the recesses 28a are open towards the end 5 and are closed toward the end 4.
  • Wings 28 and 29 are rigidly coupled to the inner surface of the drum.
  • the wings 29 extend up to the end 4 and the wings 28 extend from the annular duct 24 toward the end 5, end at the level of the flange 18 and are shaped so as to cause advancement of the material in the direction B.
  • the wings 29 furthermore have a substantially L-shaped profile which, during rotation of the drum, facilitates the tipping or cascading of the material through the combustion gases and enhances heat exchange with them.
  • the wings 28 are instead shaped so as to shield the internal surface of the drum 3 from the radiant heat of the flame. They simultaneously prevent the rise of the material and thus its falling through the flame. The heat received by the wings 28 is transferred, upon each rotation of the drum 3, to the material which flows in the lower region in this portion of the drum.
  • the portion of the drum which extends from the flange 33 to the end 5 constitutes the combustion chamber 34, into which the flame of a burner 35, which is coaxial to the axis A, is directed.
  • the combustion chamber 34 is internally covered with a lining of ceramic fibers 36 which protects the drum against excessive temperatures.
  • the burner 35 is mounted on a flange 37 which is supported by a support 38 fixed on the base 2.
  • the flange 37 is arranged adjacent to the end 5 of the drum in order to allow rotation of the drum with respect to the burner.
  • the drum 3 is externally provided, along the portion which corresponds to the length of the cylinder 14, with fins 39 for mixing the material and conveying it toward a discharge outlet 40 located adjacent to the flange 17.
  • the outlet 40 leads into a hopper 41 provided with a discharge shutter 42.
  • the described mixer is completed by two ducts 43 and 44 for feeding bitumen and respectively additives (fillers) into the interspace 15.
  • the ducts 43 and 44 are arranged on the fixed cylinder 14 on a plane which is perpendicular to the axis A and is located downstream of the flange 18.
  • the blades 39 thoroughly mix the aggregates and the RAP with bitumen and additives, added through the ducts 43 and 44 to produce a final mix which has a temperature in the range of 150-180° and is discharged into the hopper 41 through the outlet 40.
  • the inside of the drum due to aspiration through the stack 22, is at a negative pressure, so that any gases released from the mix during mixing in the interspace 15 pass through the openings 31 into the drum, where they are burned.
  • the shapes and dimensions may furthermore be any according to the requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Drying Of Solid Materials (AREA)

Claims (7)

  1. Trocken- und Mischvorrichtung (1) für die kontinuierliche Aufbereitung von bituminösem Mischgut für Beläge, aufweisend:
    - eine Trommel (3), die drehbar um eine Längsachse (A), welche bezüglich einer horizontalen Ebene geneigt ist, so daß sie ein unteres Ende (5) und ein oberes Ende (4) hat, gelagert ist,
    - Mittel (10-12) zum Rotierenlassen der Trommel um die Achse,
    - einen am unteren Ende (5) der Trommel (3) gelegenen Brenner (35) zum Richten einer Flamme entlang der Längsachse (A) gegen das obere Ende (4) der Trommel (3), um sie inwendig zu erhitzen,
    - Mittel (20) zum Einleiten von Zuschlagstoffen am oberen Ende (4) der Trommel (3),
    - einen stationären Zylinder (14), der den unteren Abschnitt der Trommel (3) konzentrisch umgibt und zusammen mit dem Abschnitt einen ringförmigen Zwischenraum (15) bildet, wobei der Zylinder (14) ein unteres Ende, das unmittelbar an den Brenner (35) angrenzt, und ein oberes Ende hat,
    - Mittel (23-27) zum Einleiten von rückgewonnenem bituminösem Material in die Trommel (3) an einer Stelle, die einen vorgegebenen Abstand vom oberen Ende des Zylinders (14) hat,
    - Mittel (31-32) zum Überführen des rückgewonnenen Materials und der Zuschlagstoffe von der Trommel (3) in den ringförmigen Zwischenraum (15) am oberen Ende des Zylinders (14),
    - Mittel (28-29), die wirksam mit dem Inneren der Trommel (3) verbunden sind, um die Beförderung der Zuschlagstoffe und des rückgewonnenen Materials zu den Mitteln (31-32) zu ihrer Einleitung in den ringförmigen Zwischenraum (15) zu bewirken,
    - Mittel (43-44) zum Einleiten von Bitumen, Füllmaterial und Additiven unmittelbar angrenzend an das obere Ende des Zylinders (14) und
    - Mittel (39), die wirksam mit der Außenseite der Trommel (3) entlang des stationären Zylinders (14) verbunden sind, um die Zuschlagstoffe und das rückgewonnene Material mit dem Bitumen, dem Füllmaterial und den Additiven zu vermischen, so daß man ein bituminöses Mischgut erhält, und um die Beförderung des Mischguts zu einem Entleerungsauslaß (40), der am unteren Ende des Zylinders (14) angeordnet ist, zu bewirken,
    wobei die Trocken- und Mischvorrichtung dadurch gekennzeichnet ist, daß:
    - der Zwischenraum (15) vollständig gegenüber dem Inneren der Trommel (3) isoliert ist und sich am unteren Abschnitt der Trommel (3) und am unteren Ende des Zylinders (14) befindet,
    - die Mittel (31-32) zum Überführen des rückgewonnenen Materials und der Zuschlagstoffe von der Trommel (3) in den ringförmigen Zwischenraum (15) so ausgelegt sind, daß sie das ganze rückgewonnene Material und die ganzen Zuschlagstoffe aus dem Inneren der Trommel (3) heraus und in den ringförmigen Zwischenraum (15) hinein überführen,
    - der Auslaß des Brenners (35) am unteren Ende (5) der Trocken- und Mischvorrichtung gelegen ist und
    - die Mittel (43-44) zum Einleiten von Bitumen, Füllmaterial und Additiven so ausgelegt sind, daß sie die Materialien direkt in den isolierten ringförmigen Zwischenraum (15) einleiten, so daß die Materialien nicht in das Innere der Trommel (3) eintreten.
  2. Trocken- und Mischvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zum Einleiten von rückgewonnenem bitumiösem Material eine ringförmige Führung (24) aufweisen, die sich um die Trommel (3) herum in einem vorgegebenen Abstand vom oberen Ende des Zylinders (14) erstreckt und eine ringförmige Kammer (25) bildet, in der eine Vielzahl von Schaufeln (26) rotiert, wobei die Schaufeln an der Außenseite der Trommel (3) befestigt sind, wobei Öffnungen (27) zwischen den Schaufeln zum Durchleiten des Materials in die Trommel ausgebildet sind, welche Öffnungen (27) mit Ausnehmungen (28a) verbunden sind, welche in der Trommel angeordnet sind und sich axial gegen den Zylinder (14) öffnen.
  3. Trocken- und Mischvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Mittel zum Überführen des rückgewonnenen Materials und der Zuschlagstoffe von der Trommel in den Zwischenraum (15) folgendes aufweisen: Öffnungen (31), die in der Trommel (3) am oberen Ende des Zwischenraums (15) ausgebildet sind, und Ablenkbleche (32), die mit den Öffnungen (31) verbunden sind und die auf der Seite angeordnet sind, welche der Seite, auf der das Material befördert wird, gegenüberliegt, wobei die Ablenkbleche geeignet sind, das Material in die Öffnungen (31) überzuleiten.
  4. Trocken- und Mischvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel, die wirksam mit der Außenseite der Trommel verbunden sind, durch Schaufeln (39) gebildet werden.
  5. Trocken- und Mischvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Abschnitt der Trommel (3), um den sich der Zylinder (14) erstreckt, inwendig von einer thermisch isolierenden Auskleidung (36) bedeckt ist.
  6. Trocken- und Mischvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zum Befördern des Materials in der Trommel (3) in der Hauptsache aus folgendem gebildet sind:
    - im wesentlichen L-förmigen Profilflügeln (29), die an die innere Oberfläche der Trommel (3) gekoppelt sind und sich vom oberen Ende (4) aus zur Einleitungszone des rückgewonnenen bituminösen Materials in die Trommel (3) erstrecken,
    - Ausnehmungen (28a), die im Inneren der Trommel (3) angeordnet sind und in Verbindung mit Öffnungen (27) der Trommel zum Durchleiten von rückgewonnenem bituminösem Material in die Trommel stehen, wobei die Ausnehmungen gegen das untere Ende (5) geöffnet und gegen das obere Ende (4) verschlossen sind, und
    - Flügeln (28), die an die innere Oberfläche der Trommel (3) gekoppelt sind und sich von der Einleitungszone des rückgewonnenen bituminösen Materials zu den Mitteln (31-32) zum Überführen des rückgewonnenen Materials und der Zuschlagstoffe von der Trommel (3) in den ringförmigen Zwischenraum (15) erstrecken, wobei die Flügel (28) so geformt sind, daß sie Abschirmungen zum Schutz der inneren Oberfläche der Trommel (3) gegen Bestrahlung bilden und daß sie die Wärme auf das Material übertragen.
  7. Trocken- und Mischvorrichtung nach Anspruch 6, wobei die L-förmigen Profilflügel (29) für das kaskadenartige Herabstürzen von Material durch das Innere der Trommel sorgen und die Flügel (28) das Aufsteigen, und damit das Herunterfallen, von Material durch das Innere der Trommel verhindern.
EP93101297A 1992-02-04 1993-01-28 Misch-Trocken-Trommel für die kontinuierliche Aufbereitung von bituminösem Mischgut unter Wiederverwendung von rückgewonnenem Material Expired - Lifetime EP0562234B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO920032 1992-02-04
ITBO920032A IT1257637B (it) 1992-02-04 1992-02-04 Essiccatore-miscelatore a tamburo per la preparazione a ciclo continuodi conglomerati bituminosi con riciclaggio di materiali di recupero

Publications (2)

Publication Number Publication Date
EP0562234A1 EP0562234A1 (de) 1993-09-29
EP0562234B1 true EP0562234B1 (de) 1997-05-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101297A Expired - Lifetime EP0562234B1 (de) 1992-02-04 1993-01-28 Misch-Trocken-Trommel für die kontinuierliche Aufbereitung von bituminösem Mischgut unter Wiederverwendung von rückgewonnenem Material

Country Status (4)

Country Link
EP (1) EP0562234B1 (de)
DE (1) DE69310972T2 (de)
ES (1) ES2104969T3 (de)
IT (1) IT1257637B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9404618A (pt) * 1994-11-24 1997-03-04 Aco Paulista Sa Usina de asfalto
ATE537300T1 (de) * 2009-07-09 2011-12-15 Ammann Italy S P A Drehtrockner für anlagen zur herstellung von bituminösem mischgut unter verwendung von wiederverwendeten materialien
EP2281946B1 (de) * 2009-07-09 2011-12-07 Ammann Italy S.p.A. Trockentrommel für Anlagen für die Herstellung von bituminösem Mischgut unter Verwendung von Recyclingmaterial
FR2986016B1 (fr) 2012-01-25 2014-03-21 Argumat Dispositif et procede de fabrication de produits enrobes, par exemple de produits enrobes bitumineux, a plaques de protection

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136966A (en) * 1974-07-15 1979-01-30 Mendenhall Robert Lamar Asphalt sleeve mixer apparatus
US4867572A (en) * 1987-09-08 1989-09-19 Astec Industries, Inc. Asphalt plant with fixed sleeve mixer
FR2632670A1 (fr) * 1988-06-13 1989-12-15 Ermont Cm Dispositif de preparation de produits enrobes bitumineux a malaxeur fixe
US5052810A (en) * 1990-02-16 1991-10-01 Astec Industries, Inc. Asphalt drum mixer with bypass temperature control

Also Published As

Publication number Publication date
IT1257637B (it) 1996-02-01
ITBO920032A0 (it) 1992-02-04
DE69310972D1 (de) 1997-07-03
ITBO920032A1 (it) 1993-08-04
DE69310972T2 (de) 1998-07-09
EP0562234A1 (de) 1993-09-29
ES2104969T3 (es) 1997-10-16

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