EP0759486A1 - Mischkneter, insbesondere für Gussasphalt - Google Patents

Mischkneter, insbesondere für Gussasphalt Download PDF

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Publication number
EP0759486A1
EP0759486A1 EP96400330A EP96400330A EP0759486A1 EP 0759486 A1 EP0759486 A1 EP 0759486A1 EP 96400330 A EP96400330 A EP 96400330A EP 96400330 A EP96400330 A EP 96400330A EP 0759486 A1 EP0759486 A1 EP 0759486A1
Authority
EP
European Patent Office
Prior art keywords
tank
fixed
mixing kneader
bar
kneader according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96400330A
Other languages
English (en)
French (fr)
Inventor
Claude Perrier
Gérard Gandon
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.)
Pavage Et Des Asphaltes De Paris SA Ste
Original Assignee
Pavage Et Des Asphaltes De Paris SA Ste
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 Pavage Et Des Asphaltes De Paris SA Ste filed Critical Pavage Et Des Asphaltes De Paris SA Ste
Publication of EP0759486A1 publication Critical patent/EP0759486A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/55—Baffles; Flow breakers
    • 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
    • E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers

Definitions

  • the present invention relates to a kneading kneader, in particular for poured asphalts, that is to say hot mixes, between 200 ° C. and 250 ° C. approximately, of filler, of sand, of gravel, of ground natural asphaltic limestone. powder and refinery bitumen.
  • Such mixtures made homogeneous by kneading, can then be poured hot to seal buildings, parking terraces and engineering structures, or to create traffic layers for road works such as sidewalks, pavements, etc ...
  • the tank comprises an axial shaft driven by an external motor and carrying a series of radial arms at the end of each of which is fixed.
  • a pallet which can be slightly curved and more or less parallel to the shaft.
  • the kneading kneader in particular for mastic asphalts, is of the type comprising a fixed heated tank, comprising two transverse plane or curved but preferably planar end walls connected by a fully or semi-cylindrical wall having an axis of longitudinal symmetry, and containing at least one fixed tool and an eccentric rotary tool respectively supported by the fixed and rotating parts of axial bearings associated with the end walls, one of said rotating parts being integral with a rotation drive means external to tank.
  • the fixed tool consists of a generally straight bar arranged in the vicinity of one third of the radius of the tank and the rotating tool consists of two generally helical bars, arranged symmetrically with respect to the center of the tank and near the cylindrical wall of the latter, each bar being mounted between two radial arms respectively close to the end walls and forming between them an angle of about 120 °.
  • each helical bar carries a series of small equidistant longitudinal scrapers alternately interposed on the two bars, constituted by removable plates adjustable on scraper carriers integral with said bars, each radial arm carrying a large terminal scraper constituted by a long removable plate adjustable on a scraper holder integral with said arm.
  • the kneader is double and contains two sets of fixed and rotating tools mounted in series, the tank being entirely cylindrical and comprising a single external device for driving in rotation.
  • FIGS 1 to 3 illustrate a first embodiment of the invention applied to a small kneading kneader for mastic asphalts having a capacity of the order of 500 kg for example.
  • Such a kneading machine preferably comprises a heated tank 1 comprising two transverse end walls, preferably planar 2 and 3 connected at their lower part by a semi-cylindrical wall 4 having a longitudinal axis of symmetry 5 and at their upper part by two longitudinal walls forming with the terminal walls a rectangular upper assembly.
  • the tank is arranged at a fixed position on the ground or on a truck and contains at least one stationary tool and one rotary tool which are offset relative to the axis of symmetry 5 and which are respectively supported by the fixed walls 6, 7 and rotary 8, 9 of axial bearings 10, 11 associated with the end walls 2, 3.
  • the rotary part 8 is made integral with a drive means in rotation not shown and external to the tank.
  • the stationary tool consists of a generally straight bar 12, which is arranged in the vicinity of one third of the radius of the semi-cylindrical tank 1, and the rotary tool consists of two bars generally helical 13, 14 which are arranged symmetrically with respect to a point 15 located on the axis of symmetry 5, approximately at the center of the tank, each helical bar being deduced from the other by a rotation of 180 ° around said central point 15
  • the two symmetrical bars 13, 14 are also arranged near the cylindrical wall 4 of the tank and are each mounted between two radial arms 16, 17 which are respectively close to the end walls 2, 3 and form an angle ⁇ between them. having for example a value of approximately 120 °.
  • the bar 12 forming the stationary tool is arranged in a radial plane, for example the vertical radial plane passing through the axis of symmetry 5 of the tank, and has a slope of the order of 5 ° to 15 ° with respect to said axis 5.
  • the bar can comprise two elements 12a, 12b connected in a known manner by associated flanges 18 and 19, the element 12a being connected to the fixed part 6 of one of the bearings 10 by a section 20 inclined at about 45 ° for example, while the element 12b is connected to the fixed part 7 of the other bearing 11 by a section in an arc of a circle 21 and a bent section 22.
  • the stationary tool can be in the form of a bar in U 23 generally parallel to the axis of symmetry 5 and preferably arranged in the vicinity of a third of the radius of the tank 1.
  • the bottom 24 of the U is connected to the fixed part 6 of one of the bearings 10 via of a chair 25 or any other support means and the respective ends 26a, 26b of the two arms 27a, 27b of the U are inclined, for example at approximately 45 °, and rounded in an arc so that they can be fixed on either side of an axial support piece 28 associated with the fixed part 7 of the other bearing 11.
  • the straight bar 12 shown in Figures 1 and 2 and the U-shaped bar 23 shown in Figures 4 and 5 are intended to break the flow of material during mixing.
  • the straight bar 12 like the U-shaped bar 23 can be solid or hollow.
  • these bars can be used to house the wires of temperature sensors, for example thermocouples, and carry several judiciously distributed temperature probes, thus making it possible to know the temperature at several points of the mixture and no longer only in facade as is currently the case.
  • the U-shaped bar 23 can also allow the circulation of a heat-transfer fluid contributing to the heating of the mixture to be kneaded in order to increase the efficiency of the heat exchange as will be explained in more detail below. -after.
  • the tubular ends 26a and 26b of the hollow U-shaped bar 23 are connected to the orifices 29a, 29b of the axial support piece 28, which is hollow and has a central partition 30 delimiting two conduits 31a and 31b opening respectively into external inlet and outlet sheaths, 32a and 32b.
  • the rectilinear parts 27a and 27b of the U-shaped tube 23 can carry fins 33 for thermal diffusion, the general outline of which is shown very schematically.
  • the heat transfer fluid arrives through the inlet sheath 32a, enters the first compartment or conduit 31a of the axial support piece 28, then circulates successively in the inlet branch 27a, the bottom 24 and the outlet branch 27b of the U-shaped tube 23, to then pass into the second compartment or duct 31b of the piece 28, then in the outlet sheath 32b.
  • the kneading kneader is conventionally heated by burners whose burnt gases circulate in the double jacket of the tank, these burnt gases can advantageously be recycled in the circuit described above by entering through the inlet sheath 32a and by exiting through the outlet sheath 32b to be released to the atmosphere. This obviously results in a significant improvement in energy efficiency due to the fact that the mixture is also heated in its bulk and no longer only by heat exchange with the wall of the mixing tank.
  • each generally helical bar 13, 14 preferably comprises a purely helical section 13a, 14a extended by a straight section 13b, 14b parallel to the cylindrical wall 4 of the tank.
  • These two sections 13a, 13b and 14a, 14b of each bar 13, 14 together carry a series of small scrapers intended to act on the cylindrical wall 4 of the tank 1. All the small scrapers are preferably equidistant and inserted alternately on the two bars 13 and 14 so as to cover the entire cylindrical surface of the wall 4.
  • scrapers can be constituted by removable plates 34 mounted in an adjustable manner, for example by means of oblong holes, on scraper holders 35 which are made integral with said sections, for example by welding, so as to make a certain angle with the associated director of the cylindrical wall 4.
  • the research which led to the invention has shown that an angle of approximately 35 ° is perfectly suitable for allow the scraped material to escape and return to the mass during mixing without requiring excessive force on the helical structure and / or the mechanism rotational drive, whose direction of work is obviously a function of the direction of gyration of the two constituent propellers.
  • the two generally helical bars 13 and 14 or the two assemblies comprising a purely helical section 13a or 14a extended by a straight section 13b or 14b are each mounted between two radial arms 16 and 17 which are respectively close to the end walls 2 and 3.
  • These radial arms are respectively mounted on the rotating parts 8 and 9 of the axial bearings 10 and 11 and can have a generally cylindrical or slightly conical shape. However, they must each have a generator parallel to the end walls and arranged so as to be able to receive a large scraper intended to act on the associated end wall 2 or 3 of the tank 1.
  • These large scrapers may each consist of a long removable plate 36 mounted in an adjustable manner, for example by means of oblong holes, on a scraper holder 37 made integral with the support arm 16 or 17, for example by welding.
  • each large scraper holder preferably makes a certain angle with the surface of the associated end wall 2 or 3. The research which led to the invention has shown that an angle of approximately 65 ° is perfectly acceptable for bringing the scraped material to be returned to the mass during kneading.
  • the removable plates 34 and 36 can be constituted by metal, by a ceramic, by polytetrafluoroethylene or even by metal brushes which, when the equipment must be explosion-proof, are advantageously made of brass.
  • each of the two bars 13, 14 and, more precisely, each of the two helical sections 13a and 14a may include a bar 38, which serves to stiffen the assembly and particularly improves the stirring effect and which is fixed on the bar or the associated section by means of at least two spacers 39 and, optionally, a bent end of the bar 40.
  • the two helical bars 13 and 14 can be constituted by a solid profile or a hollow tube having a circular, elliptical or oblong cross section, for example with two plane and parallel walls connected by semicircular end walls.
  • the solution consisting in increasing their section leads to heavy, bulky tools which are difficult to install without enlarging the loading doors and to be driven in rotation due to their inertia.
  • the only acceptable solution therefore consists in making a double kneader in which the two sets of tools are mounted in series, which makes it possible to use tools of reasonable size and relatively standard, without any particular assembly difficulty.
  • the intermediate bearing 41 essentially comprises an outer ring 43 supported by three or four radial arms 44, the free ends of which are respectively housed in an adjustable manner in pots 45 integral with the entirely cylindrical inner wall 4 of the tank 1.
  • the arms 44 are arranged so as to leave entirely free not only the spaces located directly above the loading doors (not shown) and also the bottom of the tank 1 in order to allow scraping of the latter from the drain valve (not shown) after the end of a mixing operation.
  • the inner face of the outer ring 43 has a concave rounded shape allowing it to cooperate in a movement of the ball joint with the convex rounded external face of an inner ring 46 in order to absorb the misalignments of the two sets of tools.
  • the parts 47 and 48 respectively support the two sets of rotary tools 13 and 14, are integral with one another to form the coupling device 42 and are themselves supported by a bearing 49 mounted inside of the inner ring 46.
  • Another self-lubricating bearing 50 is mounted between the rotating external parts 47, 48 and the fixed internal parts 51 which are integral with the two fixed tools 12.
  • the outer ring 43 is preferably surrounded by a sheet metal joint cover in order to avoid filling the interstices between the parts 43, 47 and 48.
  • scraping rollers 54 At the base of the rotary tools, it is also possible to fix other scraping devices by means of flanges 52 on which are fixed bent flat irons forming support arms 53 for scraping rollers 54. These rollers can be fitted either with brushes 55 arranged on the generators of the rollers, or with brushes arranged around the rollers in a helical path. These brushes can be substituted or added to the scraping devices previously described for a small kneading machine.
  • the present invention has been described with reference to a kneading kneader, in particular for mastic asphalts, but it is also applicable to any other bituminous mixture, to any non-bituminous mixture comprising a certain proportion of mineral aggregates, such as resin concretes by example, or to any mixture of the chemical or food industry comprising a certain proportion of granular ingredients as well as one or more ingredients acting as a binder so that after kneading, the mixture is present under the shape of a homogeneous dough, the kneader being heated or not and being able even to be cooled according to needs.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP96400330A 1995-08-18 1996-02-16 Mischkneter, insbesondere für Gussasphalt Withdrawn EP0759486A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509924 1995-08-18
FR9509924A FR2737899B1 (fr) 1995-08-18 1995-08-18 Petrin de malaxage, notamment pour asphaltes coules

Publications (1)

Publication Number Publication Date
EP0759486A1 true EP0759486A1 (de) 1997-02-26

Family

ID=9481998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400330A Withdrawn EP0759486A1 (de) 1995-08-18 1996-02-16 Mischkneter, insbesondere für Gussasphalt

Country Status (2)

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EP (1) EP0759486A1 (de)
FR (1) FR2737899B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007035982A1 (en) * 2005-09-28 2007-04-05 Herbert Johann Trimborn Method and apparatus for applying hot mix for tar sealed roads
CN113214662A (zh) * 2021-05-11 2021-08-06 中交第三公路工程局有限公司 一种环保型沥青材料及其制备工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803363A (en) * 1954-08-17 1958-10-22 Municipal Appliances Company L Improvements in or relating to tanks for bituminous compounds and the like
DE1409015A1 (de) * 1957-04-18 1968-11-14 Endress Ag Autogen Vorrichtung zur Aufbereitung von Strassenbaumaterialien
DE3114883A1 (de) * 1981-04-13 1982-11-11 Beck, Hermann, 7067 Buoch Ruehrwerk fuer bitumoesen brei als strassenbaustoff bzw.strassenflickgut.
FR2710551A1 (fr) * 1993-09-27 1995-04-07 Loiselet Michel Dispositif de pétrissage malaxage complétant l'action de l'outil tournant concentriquement sur une ligne d'axes horizontale, verticale, ou oblique de pétrin malaxeur à cuve non tournante.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803363A (en) * 1954-08-17 1958-10-22 Municipal Appliances Company L Improvements in or relating to tanks for bituminous compounds and the like
DE1409015A1 (de) * 1957-04-18 1968-11-14 Endress Ag Autogen Vorrichtung zur Aufbereitung von Strassenbaumaterialien
DE3114883A1 (de) * 1981-04-13 1982-11-11 Beck, Hermann, 7067 Buoch Ruehrwerk fuer bitumoesen brei als strassenbaustoff bzw.strassenflickgut.
FR2710551A1 (fr) * 1993-09-27 1995-04-07 Loiselet Michel Dispositif de pétrissage malaxage complétant l'action de l'outil tournant concentriquement sur une ligne d'axes horizontale, verticale, ou oblique de pétrin malaxeur à cuve non tournante.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007035982A1 (en) * 2005-09-28 2007-04-05 Herbert Johann Trimborn Method and apparatus for applying hot mix for tar sealed roads
CN113214662A (zh) * 2021-05-11 2021-08-06 中交第三公路工程局有限公司 一种环保型沥青材料及其制备工艺

Also Published As

Publication number Publication date
FR2737899A1 (fr) 1997-02-21
FR2737899B1 (fr) 1997-10-31

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