EP0434172B1 - Method and apparatus for producing bituminous mixtures - Google Patents

Method and apparatus for producing bituminous mixtures Download PDF

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Publication number
EP0434172B1
EP0434172B1 EP90203507A EP90203507A EP0434172B1 EP 0434172 B1 EP0434172 B1 EP 0434172B1 EP 90203507 A EP90203507 A EP 90203507A EP 90203507 A EP90203507 A EP 90203507A EP 0434172 B1 EP0434172 B1 EP 0434172B1
Authority
EP
European Patent Office
Prior art keywords
space
slit
moving
pipe
type space
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
EP90203507A
Other languages
German (de)
French (fr)
Other versions
EP0434172A1 (en
Inventor
Arie Jan Boon
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.)
Bitumarin BV
Original Assignee
Bitumarin BV
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 Bitumarin BV filed Critical Bitumarin BV
Priority to AT90203507T priority Critical patent/ATE86696T1/en
Publication of EP0434172A1 publication Critical patent/EP0434172A1/en
Application granted granted Critical
Publication of EP0434172B1 publication Critical patent/EP0434172B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • 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
    • 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
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof

Definitions

  • the invention relates to a method for producing mixtures containing bitumen, for example for use in road building and hydraulic engineering, in which the material to be treated is fed through a slit-type space between two heated surfaces.
  • a method for producing mixtures containing bitumen for example for use in road building and hydraulic engineering, in which the material to be treated is fed through a slit-type space between two heated surfaces.
  • EP-A- 0,192,300 European Patent Specification EP-A- 0,192,300.
  • the materials to be treated are fed through a slit-type space which is bounded by the interior surface of a cylindrical external jacket and the exterior surface of a rotor rotating concentrically inside the jacket, the common axis of the jacket and the rotor extending horizontally.
  • the rotor is caused to rotate in order to convey the material to be treated through the relatively narrow slit-type gap, ribs or upright studs or pins extending along a helix also preferably being provided on the exterior surface of the rotor.
  • the disadvantage of the known method is, firstly, that it is not possible or very difficult to ensure that the slit-type gap is always completely filled with the material to be treated, and secondly that the conveyance through the slit-type gap proceeds very laboriously, as a result of which the efficiency of the method leaves something to be desired.
  • the object of the invention is to provide an improved method.
  • the material is conveyed by the force of gravity through the slit-type space because the heated surfaces have been arranged vertically and the material is fed into said space at the top of the slit-type space so that said material moves downwards under the influence of the force of gravity and emerges from the slit-type space at the bottom, the material preferably being mixed or stirred together during its movement through the slit-type space.
  • the invention is based on the insight that the width of the slit-type gap can be substantially greater than in the known method because, as a consequence of a combination of certain properties of the material to be treated, the heat transfer through the two heated surfaces is greater than the heat transfer which would be expected on the basis of experience.
  • the material can be fed through said space as a consequence of the force of gravity, said space being vertical, thus ensuring that said space is always completely filled with material.
  • the invention also relates to an apparatus for carrying out the method, comprising two surfaces forming the said surfaces, enclosing an annular gap and situated coaxially inside each other, means for heating said surfaces, a material feed near one end and a material discharge at the other end of the said space, the surfaces, according to the invention, being vertical and the material feed being provided at the top and the material discharge near the bottom of the annular gap, means for mixing together the material moving through the slit-type space being preferably provided in said space.
  • the means for mixing together the material are formed by stud-like elements capable of moving up and down.
  • said stud-like elements can be provided on at least one of the surfaces, said surface being designed to be capable of moving up and down with respect to the other surface.
  • the studs may, however, also be provided on bodies extending through the gap and mounted so as to be capable of moving up and down.
  • At least one pipe is provided which hangs downwardly inside the annular gap which pipe is provided with orifices extending through the wall at different levels.
  • U-shaped section pieces are fixed to the pipe at the locations of the orifices, which pieces cover said orifices with an interspace from the top so that the formed steam at first is collected by said section pieces to be discharged via said orifices in the pipe upwardly through said pipe.
  • the pipe may be mounted for up and down movement so that it can form also a body as mentioned hereinabove having elements for mixing together the material.
  • the surfaces can be designed to be capable of moving as specified in Claims 8 and/or 9.
  • the apparatus comprises a supporting and guiding structure 1 which rests on a floor 2.
  • the external jacket 3 is provided, on the outside, with a sleeve 6 of insulating material. Stud-like elements 3′ are provided on the inside of the external jacket and stud-like elements 4′ are provided on the outside of the internal jacket 4.
  • a filling hopper 7 for the material to be treated is provided at the upper end of the annular gap 5 .
  • a collecting hopper 8 for the treated material which opens into a discharge apparatus 9 for said treated material is present underneath said gap 5.
  • the external jacket 3 is provided with a hydraulic drive mechanism 10 and the internal jacket 4 is provided with a hydraulic drive mechanism 11.
  • the external jacket 3 and the internal jacket 4 can be set in motion translationally by means of said mechanisms 10 and 11, as shown by the double arrows A and B.
  • the mechanisms 10 and 11 may, however, be of a design such that the external jacket 3 and the internal jacket 4 can also be set in motion rotationally.
  • the power for the mechanisms 10 and 11 is delivered by the hydraulic pumping unit 13 via the lines 12.
  • Both the external jacket 3 of double-walled design and the internal jacket 4 of double-walled design are heated by passing a heating medium, for example thermal oil, through them, which medium is delivered by the heating and pumping unit 15 via the lines 14.
  • a heating medium for example thermal oil
  • the drawing furthermore also shows a filling apparatus 16.
  • a number of pipes 17 for the discharge to the outside of steam hang downwardly inside the annular space 5, of which pipes only one is visible in the figure.
  • At specific levels orifices 18 are provided through the wall of the pipe which are covered with an interspace from the top by U-shaped section pieces 19.
  • Said pipes 17 may be mounted for up and down movement so that they can also mix together the material to be treated.
  • the material to be treated is fed via the filling apparatus 16 into the filling hopper 7, from which said material enters the annular space 5. Said material is conveyed through said space 5 under the influence of the force of gravity, said material being dried and heated respectively by means of the heated jackets 3 and 4, and the steam formed thereby being collected by the U-shaped section pieces 19 and being discharged via the orifices 18 through the pipes 17 to the outside where the steam may be permitted to condense.
  • the jackets 3 and 4 may be set in motion translationally and/or rotationally by means of the associated drive mechanisms 10 and 11, the wall friction being compensated for thereby.
  • the material is thoroughly mixed or stirred by the presence of the studs 3′, 4′. After leaving the space 5, the treated material is collected in the collecting hopper 8 and transported out of the latter via the discharge apparatus 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Road Paving Machines (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Saccharide Compounds (AREA)

Abstract

Method and apparatus for producing mixtures containing bitumen, in which the material to be treated is conveyed by the force of gravity through a slit-type space between two vertically arranged heated surfaces (3,4). <IMAGE>

Description

  • The invention relates to a method for producing mixtures containing bitumen, for example for use in road building and hydraulic engineering, in which the material to be treated is fed through a slit-type space between two heated surfaces. Such a method is known from European Patent Specification EP-A- 0,192,300.
  • In the known method, the materials to be treated are fed through a slit-type space which is bounded by the interior surface of a cylindrical external jacket and the exterior surface of a rotor rotating concentrically inside the jacket, the common axis of the jacket and the rotor extending horizontally. The rotor is caused to rotate in order to convey the material to be treated through the relatively narrow slit-type gap, ribs or upright studs or pins extending along a helix also preferably being provided on the exterior surface of the rotor.
  • The disadvantage of the known method is, firstly, that it is not possible or very difficult to ensure that the slit-type gap is always completely filled with the material to be treated, and secondly that the conveyance through the slit-type gap proceeds very laboriously, as a result of which the efficiency of the method leaves something to be desired.
  • The object of the invention is to provide an improved method.
  • This object is achieved in that, in the method according to the invention, the material is conveyed by the force of gravity through the slit-type space because the heated surfaces have been arranged vertically and the material is fed into said space at the top of the slit-type space so that said material moves downwards under the influence of the force of gravity and emerges from the slit-type space at the bottom, the material preferably being mixed or stirred together during its movement through the slit-type space.
  • The invention is based on the insight that the width of the slit-type gap can be substantially greater than in the known method because, as a consequence of a combination of certain properties of the material to be treated, the heat transfer through the two heated surfaces is greater than the heat transfer which would be expected on the basis of experience. As a result of this substantially wider gap, the material can be fed through said space as a consequence of the force of gravity, said space being vertical, thus ensuring that said space is always completely filled with material. In order to obtain a favourable temperature gradient over the wider gap under these conditions, it may be necessary that, during the movement of the material through the slit-type space, it is mixed or stirred together.
  • The invention also relates to an apparatus for carrying out the method, comprising two surfaces forming the said surfaces, enclosing an annular gap and situated coaxially inside each other, means for heating said surfaces, a material feed near one end and a material discharge at the other end of the said space, the surfaces, according to the invention, being vertical and the material feed being provided at the top and the material discharge near the bottom of the annular gap, means for mixing together the material moving through the slit-type space being preferably provided in said space.
  • Preferably, the means for mixing together the material are formed by stud-like elements capable of moving up and down.
  • Advantageously, said stud-like elements can be provided on at least one of the surfaces, said surface being designed to be capable of moving up and down with respect to the other surface.
  • The studs may, however, also be provided on bodies extending through the gap and mounted so as to be capable of moving up and down.
  • Since during warming of the material moving through the annular gap steam is formed which has to be discharged for a proper course of the process, preferably at least one pipe is provided which hangs downwardly inside the annular gap which pipe is provided with orifices extending through the wall at different levels.
  • Advantageously U-shaped section pieces are fixed to the pipe at the locations of the orifices, which pieces cover said orifices with an interspace from the top so that the formed steam at first is collected by said section pieces to be discharged via said orifices in the pipe upwardly through said pipe.
  • The pipe may be mounted for up and down movement so that it can form also a body as mentioned hereinabove having elements for mixing together the material.
  • In order to promote the feeding of the material through the annular space, the surfaces can be designed to be capable of moving as specified in Claims 8 and/or 9.
  • The invention is explained in greater detail with reference to the drawing, which shows an embodiment of the apparatus according to the invention.
  • As shown in the drawing, the apparatus comprises a supporting and guiding structure 1 which rests on a floor 2. Provided inside said structure 1 are a vertically positioned, cylindrical external jacket 3 of double-walled design and a cylindrical internal jacket 4 of double-walled design situated concentrically therein in a manner such that an annular gap 5 is formed between the jackets 3 and 4. The external jacket 3 is provided, on the outside, with a sleeve 6 of insulating material. Stud-like elements 3′ are provided on the inside of the external jacket and stud-like elements 4′ are provided on the outside of the internal jacket 4.
  • Provided at the upper end of the annular gap 5 is a filling hopper 7 for the material to be treated, while a collecting hopper 8 for the treated material, which opens into a discharge apparatus 9 for said treated material is present underneath said gap 5.
  • The external jacket 3 is provided with a hydraulic drive mechanism 10 and the internal jacket 4 is provided with a hydraulic drive mechanism 11. The external jacket 3 and the internal jacket 4 can be set in motion translationally by means of said mechanisms 10 and 11, as shown by the double arrows A and B. The mechanisms 10 and 11 may, however, be of a design such that the external jacket 3 and the internal jacket 4 can also be set in motion rotationally. The power for the mechanisms 10 and 11 is delivered by the hydraulic pumping unit 13 via the lines 12.
  • Both the external jacket 3 of double-walled design and the internal jacket 4 of double-walled design are heated by passing a heating medium, for example thermal oil, through them, which medium is delivered by the heating and pumping unit 15 via the lines 14.
  • The drawing furthermore also shows a filling apparatus 16.
  • A number of pipes 17 for the discharge to the outside of steam hang downwardly inside the annular space 5, of which pipes only one is visible in the figure. At specific levels orifices 18 are provided through the wall of the pipe which are covered with an interspace from the top by U-shaped section pieces 19. Said pipes 17 may be mounted for up and down movement so that they can also mix together the material to be treated.
  • When the apparatus is in operation, the material to be treated is fed via the filling apparatus 16 into the filling hopper 7, from which said material enters the annular space 5. Said material is conveyed through said space 5 under the influence of the force of gravity, said material being dried and heated respectively by means of the heated jackets 3 and 4, and the steam formed thereby being collected by the U-shaped section pieces 19 and being discharged via the orifices 18 through the pipes 17 to the outside where the steam may be permitted to condense. In order to facilitate the conveyance of the material, the jackets 3 and 4 may be set in motion translationally and/or rotationally by means of the associated drive mechanisms 10 and 11, the wall friction being compensated for thereby. At the same time, the material is thoroughly mixed or stirred by the presence of the studs 3′, 4′. After leaving the space 5, the treated material is collected in the collecting hopper 8 and transported out of the latter via the discharge apparatus 9.

Claims (12)

  1. Method for producing mixtures containing bitumen, for example for use in road building or hydraulic engineering, in which the material to be treated is fed through a slit-type space (5) between two heated surfaces (3,4), characterised in that the material is conveyed by the force of gravity through the slit-type space (5) because the heated surfaces (3,4) have been arranged vertically and the material is fed into said space at the top (7) of the slit-type space so that said material moves downwards under the influence of the force of gravity and emerges from the slit-type space at the bottom (8).
  2. Method according to Claim 1, characterised in that the material is thoroughly mixed or stirred during its movement through the slit-type space.
  3. Apparatus for carrying out the method according to Claim 1 or 2, comprising two surfaces forming the said surfaces (3,4), enclosing an annular gap (5) and situated coaxially inside each other, means (15) for heating said surfaces, a material feed (7) near one end and a material discharge (8) at the other end of the said space, characterised in that the surfaces (3,4) are vertical and the material feed is provided at the top (7) and the material discharge near the bottom (8) of the annular gap (5).
  4. Apparatus according to Claim 3, characterised in that means are present in the annular gap for mixing or stirring together the material moving through said gap.
  5. Apparatus according to claims 3 or 4, characterized in that at least one pipe for discharging steam to the outside hangs downwardly inside the annular gap, which pipe is provided at different levels with orifices extending through the wall.
  6. Apparatus according to claim 5, characterized in that U-shaped section pieces are fixed to the pipe at the locations of the orifices which pieces cover said orifices with an interspace from the top.
  7. Apparatus according to claims 5 or 6, characterized in that said pipe is mounted for up and down movement.
  8. Apparatus according to Claim 3-7, characterised in that at least one of the said surfaces is designed to be capable of moving up and down in the vertical direction.
  9. Apparatus according to Claims 3-8, characterised in that at least one part, bounding the annular space, of at least one of the surfaces is capable of performing a to-and-fro rotational movement around the centre line.
  10. Apparatus according to Claims 3-9, characterised in that the means for mixing the material together are formed by stud-like elements capable of moving up and down.
  11. Apparatus according to Claim 10, characterised in that the stud-like elements are provided on at least one of the surfaces, said surface being designed to be capable of moving up and down with respect to the other surface.
  12. Apparatus according to Claim 10, characterised in that the studs are provided on bodies extending through the annular space and capable of moving up and down.
EP90203507A 1989-12-21 1990-12-21 Method and apparatus for producing bituminous mixtures Expired - Lifetime EP0434172B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90203507T ATE86696T1 (en) 1989-12-21 1990-12-21 METHOD AND DEVICE FOR THE PRODUCTION OF BITUMINOUS MIX.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8903141 1989-12-21
NL8903141A NL8903141A (en) 1989-12-21 1989-12-21 METHOD AND APPARATUS FOR PREPARING BITUMINOUS MIXTURES

Publications (2)

Publication Number Publication Date
EP0434172A1 EP0434172A1 (en) 1991-06-26
EP0434172B1 true EP0434172B1 (en) 1993-03-10

Family

ID=19855823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90203507A Expired - Lifetime EP0434172B1 (en) 1989-12-21 1990-12-21 Method and apparatus for producing bituminous mixtures

Country Status (8)

Country Link
EP (1) EP0434172B1 (en)
AT (1) ATE86696T1 (en)
CA (1) CA2033026C (en)
DE (1) DE69001066T2 (en)
DK (1) DK0434172T3 (en)
ES (1) ES2038863T3 (en)
GR (1) GR3007377T3 (en)
NL (1) NL8903141A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114602386A (en) * 2022-04-02 2022-06-10 山推建友机械股份有限公司 Asphalt mixture stirring system and method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1454878A1 (en) * 1962-04-13 1969-02-20 Vaterland Werk Friedrich Herfe Plastic mixer with a kettle-like mixing container and a mixing element arranged above the container bottom
US3381943A (en) * 1967-01-17 1968-05-07 Trumbull Asphalt Company Method and apparatus for mixing liquid and solid materials
US4406676A (en) * 1980-12-02 1983-09-27 Potter George R Method and apparatus for filtering a stream of gas while drying waste lignocellulosic material
NO151159C (en) * 1982-07-06 1985-02-20 Ameco Hamar As PROCEDURE AND DEVICE FOR ENERGY RECOVERY AND EXHAUST CLEANING DURING PREPARATION
DE3341006A1 (en) * 1983-11-12 1985-05-30 Alfelder Eisenwerke Carl Heise KG vorm. Otto Wesselmann & Cie., 3220 Alfeld Device for the separate heating of filler for the manufacture of bituminous coated materials
NL8500415A (en) * 1985-02-14 1986-09-01 Bitumarin Nv MIXING SYSTEM, ESPECIALLY FOR BITUMINOUS MIXTURES.

Also Published As

Publication number Publication date
CA2033026C (en) 1995-10-03
ATE86696T1 (en) 1993-03-15
GR3007377T3 (en) 1993-07-30
EP0434172A1 (en) 1991-06-26
ES2038863T3 (en) 1993-08-01
DK0434172T3 (en) 1993-04-13
CA2033026A1 (en) 1991-06-22
NL8903141A (en) 1991-07-16
DE69001066D1 (en) 1993-04-15
DE69001066T2 (en) 1993-06-17

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