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
  • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
  • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
  • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
  • F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
  • F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B23/00—Heating arrangements
  • F26B23/02—Heating arrangements using combustion heating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B3/00—Drying solid materials or objects by processes involving the application of heat
  • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
  • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying goods
  • F26B2200/08—Granular materials

Definitions

• the present invention relates to the field of machines intended for the manufacture and / or the renovation of roads in general. These machines are generally referred to as wrappers or asphalt plants.
• a medium capacity mixing plant may include a cylindrical drum configured to dry aggregate using a burner located at one end of the drum.
• the interior surface of such a drum may have aggregate drive plates configured to scatter the aggregate in the hot air and the fumes diffused inside the drum by the burner. The dimensions of the drum and the activity of the burner strongly impact the drying quality of the aggregates.
• the energy consumed by the burner is very large and the dimensions of the medium-capacity asphalt mixing plant are relatively small.
• the length of the drum is therefore limited, as is the volume of fuel used to feed the burner, which can affect the quality of drying of the aggregates.
• An object of the present invention is to at least partially solve a drawback of the state of the art.
• the invention relates to a device for drying aggregates for an asphalt production plant, the drying device comprising a cylindrical drum with an inlet end and an outlet end and a burner disposed on the side. from the outlet end, aggregate drive plates being installed inside the cylindrical drum for the dispersal of the aggregates in the hot air diffused by the burner, with at least part of the drive plates having at their free ends cut-out slots and in that at least part of the drive plates have a fixing wall and an end wall and in that the angle between the fixing wall and the end wall is between 100 ° and 160 ° and more particularly equal to 125 °.
• Slits cut in the free ends of part of the drive plates allow the fines present in the aggregates to be discharged as soon as they enter the dryer.
• the drying time of the aggregates inside the drying device can be reduced, which makes it possible to limit the fuel consumption by the burner and to reduce the dimensions of the drying device, in particular in length. and more particularly of the cylindrical drum with the reduced size of the coating plant.
• the invention may further include one or more of the following aspects taken alone or in combination:
• a comb shape formed by the slots cut in a free end of a drive plate includes slots evenly distributed along the sheet
• the drive plates with cut slots are located at a maximum distance corresponding to a quarter of the total length of the cylindrical drum from the entry end;
• the cut slots have a rectangular shape
• the drive plates are arranged in circumferential rows on the inner periphery of the cylindrical drum;
• circumferential row comprises between six and eighteen drive plates of the same length, and more particularly twelve drive plates of the same length;
• the angular difference separating two neighboring drive plates of the same circumferential row is 30 °; - The drive plates forming two adjacent circumferential rows are staggered;
• the drive plates forming a first circumferential row and an adjacent second circumferential row located at the entry end have at their free ends between three and five slots spaced at a minimum length equal to the thickness of the slots;
• the drive plates forming a third circumferential row starting from the input end have a length at least twice that of the drive plates forming a first circumferential row and an adjacent second circumferential row located at the entry end;
• the drive plates forming a third circumferential row starting from the entry end have at their free ends between three and five slots spaced at a minimum length equal to three times the thickness of the slots;
• the drive plates forming a fourth, a fifth and a sixth circumferential rows starting from the input end have a length equal to that of the drive plates forming the third circumferential row starting from the end of entrance ;
• the drive plates forming a fourth, a fifth and a sixth circumferential rows starting from the entry end have free ends without slots;
• the drive plates forming a last circumferential row counted from the inlet end and located at the outlet end have a fixing wall, a junction wall and an end wall without slots;
• the angle between the fixing wall and the junction wall is between 90 ° and 110 °
• the angle between the junction wall and the end wall is between 100 ° and 150 °.
• FIG.l shows a schematic perspective view of a mobile coating plant
• FIG.2 shows a cutaway perspective view of the cylindrical drum of the heater
• FIG.3 shows a sectional view of the cylindrical drum of Figure 2 along the radial plane P
• FIG.4 is a perspective view of a drive plate
• FIG.5 shows a sectional view of the drive plate of Figure 4,
• FIG.6 shows a sectional view of another drive plate
• first element or second element as well as first parameter and second parameter or even first criterion and second criterion, etc.
• indexing does not imply a priority of one element, parameter or criterion over another and such names can easily be interchanged without departing from the scope of the present description.
• This indexation does not imply an order in time, for example, to assess this or that criterion.
• FIG. 1 shows a schematic representation of a mobile coating plant 1.
• This coating plant 1 comprises in particular loading hoppers 3a, 3b, in particular a loading hopper 3a for fines such as sand and a loading hopper 3b for aggregates such as gravel.
• These fines and aggregates are transported by a first conveyor 4 to a drying device 5, such as a dryer drum.
• the fines and aggregates are then mixed with a hot hydrocarbon binder in a mixer 6 in order to form the mix.
• the hot hydrocarbon binder can in particular come from a melter 9a.
• the mix is discharged via a second conveyor 7 to a temporary storage tank, to a means of transport or directly to the site for immediate use.
• Such a coating plant may in particular have a production rate of asphalt of the order of 5 to 40 tonnes per hour.
• the loading hoppers 3a, 3b, the first conveyor 4, as well as the melter 9a with hydrocarbon binder can thus be mounted on a trailer or on a platform which can be loaded on a trailer.
• the drying device 5, the mixer 6 as well as the second conveyor 7 can for their part be mounted on another trailer or another platform that can be loaded on a trailer.
• FIG. 2 shows in more detail the drying device 5 for the asphalt production plant 1.
• the drying device 5 more particularly comprises a cylindrical drum 8 with an inlet end 8a and an outlet end 8b and a burner. 9 disposed on the side of the outlet end 8b.
• FIG. 2 shows more particularly a section in the longitudinal direction of the cylindrical drum 8.
• the cylindrical drum 8 has for example a length of four meters and a diameter of one meter.
• the wall thickness of the cylindrical drum 8 is, for example, three millimeters.
• the cylindrical drum 8 has a geometry of revolution about an axis of revolution X.
• the cylindrical drum 8 is for example tilted three degrees. The slope thus created by this inclination favors the progression by gravity of the fines and the aggregates towards the burner 9.
• the progression by gravity of the fines and the aggregates towards the burner 9 is in particular illustrated by double arrows F in FIG. 2.
• the drying device 5 further comprises drive plates 10 for aggregates being installed inside the cylindrical drum 8 for the dispersal of the aggregates in the hot air diffused by the burner 9. These drive plates 10 have a length much greater than their transverse dimensions. The long side of the sheets
• the drive plates 10 At least part of them have at their free ends slots 11 cut out.
• the free ends correspond in particular to a portion of the drive plates 10 which is not in contact with the inner periphery of the cylindrical drum 8.
• the slots 11 have for example a shape
• a rectangular shape is very easy to cut from a sheet
• the shape of the slots 11 is for example that of a "U".
• the slits 11 preferably have a thickness less than the average size of the aggregates and greater than the average size of the fines so that only the fines can pass through the slots 11. This improves the mixing and drying of the fines and aggregates.
• the drive plates 10 are for example arranged in circumferential rows 15a, 15b, 15c, 15d, 15e, 15f and 15g on the inner periphery of the cylindrical drum 8.
• the cylindrical drum 8 comprises for example seven circumferential rows 15a, 15b, 15c , 15d, 15th, 15f and 15g distinct.
• the first circumferential row 15a is located at the entry end 8a.
• the last circumferential row, here the seventh circumferential row 15g is located at the level of the output end 8b.
• Circumferential rows 15b, 15c, 15d, 15e and 15f lie between the first row circumferential 15a and the seventh circumferential row 15g.
• the number of circumferential rows may be greater than seven or even less than seven.
• the drive plates 10 having cut-out slots 11 are for example located at a maximum distance D corresponding to a quarter of the total length T of the cylindrical drum 8 starting from the inlet end 8a.
• the drive plates 10 located near the output end 8b therefore do not necessarily have slots 11 because the fines are a priori mainly discharged through the slots 11 cut in the free ends of the drive plates 10 close to the inlet end 8a.
• the circumferential rows 15a, 15b and 15c are in particular located at a maximum distance corresponding to a quarter of the total length T of the cylindrical drum 8 starting from the inlet end 8a.
• a circumferential row 15a, 15b, 15c, 15d, 15e, 15f and / or 15g comprises for example between six and eighteen drive plates 10 of the same length L, and more particularly twelve drive plates 10 of the same length L
• the drive plates 10 forming the same circumferential row 15a, 15b, 15c, 15d, 15e, 15f or 15g can therefore all have the same length L and more generally have the same shape.
• the drive plates 10 of two different circumferential rows do not necessarily have the same shape or the same length L.
• the length L of the drive plates 10 can be increasing between the input end 8a and the output end 8b.
• the drive plates 10 are regularly spaced on the inner periphery of the cylindrical drum 8, as shown in Figures 2 and 3.
• a circumferential row 15a, 15b, 15c, 15d, 15e, 15f and / or 15g comprises for example twelve drive plates 10
• the angular difference separating two neighboring drive plates 10 of the same circumferential row is for example 30 °. This configuration is illustrated in particular in FIG. 3.
• a circumferential row 15a, 15b, 15c, 15d
• 15e, 15f and / or 15g comprises for example six drive plates 10, the angular difference between two neighboring drive plates 10 is for example 60 °.
• the drive plates 10 forming two adjacent circumferential rows are, for example, staggered.
• two adjacent circumferential rows each comprise for example twelve drive plates 10
• an angular offset of 15 ° can be observed in the arrangement of the drive plates 10 forming these two adjacent circumferential rows.
• This configuration is very particularly visible in FIG. 3 in which a circumferential row is represented by twelve hatched drive plates 10, this circumferential row being offset by 15 ° with respect to an adjacent circumferential row represented by twelve drive plates 10 not - hatched.
• At least part of the drive plates 10 comprise, for example, a fixing wall 12 and an end wall 14.
• An example of drive plate 10 is illustrated. in Figures 4 and 5.
• the drive plates 10 have at their free ends cut-out slots 11, these slots 11 are arranged in the free end of the end wall 14.
• the fixing wall 12 serves in particular as a support for fixing the drive plates 10 on the inner periphery of the cylindrical drum 8.
• the edges of the fixing walls 12 of the drive plates 10 are for example welded to the inner periphery of the cylindrical drum 8.
• Brackets 16 allow the positioning of the drive plates 10 inside the cylindrical drum 8.
• the brackets 16 can also serve as reinforcements for the drive plates 10 by opposing the forces exerted by the aggregates on the plates. drive 10 when the aggregates are scattered inside the cylindrical drum 8.
• the brackets 16 are for example arranged along the fixing walls 12.
• an angle a can be observed between the fixing wall 12 and the end wall 14, as illustrated in FIG. 5.
• the angle a is for example between 100 ° and 160 °, and more particularly equal to 125 °.
• the angle a makes it possible to form a concave surface with the fixing wall 12 and the end wall 14. This concave surface is oriented in the direction of rotation of the cylindrical drum 8. It thus makes it possible to shovel the aggregates and fines during the rotation of the cylindrical drum 8 in order to then disperse them in the hot air stream and in the fumes diffused by the burner 9 to dry them.
• an angle ⁇ of 125 ° makes it possible to maximize the surface which can be occupied by aggregates and fines in the drive plate 10 while ensuring efficient "shoveling".
• the drive plates 10 forming a first circumferential row 15a and an adjacent second circumferential row 15b located at the input end 8a are of the same length L.
• the length L of these drive plates 10 is between ten and twenty-five centimeters and more
• brackets 16 at least five centimeters apart which position the fixing walls 12 of the drive plates 10 forming the first circumferential row 15a and the second circumferential row 15b adjacent to the inner periphery of the cylindrical drum 8.
• the drive plates 10 forming the first circumferential row 15a and the adjacent second circumferential row 15b have slots 11 cut in their free ends.
• circumferential 15a and the second adjacent circumferential row 15b form a comb. That is to say that the slots 11 are for example regularly spaced the along the drive plates 10. In addition, the spacing between two adjacent slots 11 is for example of the same order of magnitude as the width of the slots 11.
• the slits 11 have for example a length of between five and ten centimeters and a width of between one and three centimeters.
• the length of the slots 11 is oriented radially, that is to say perpendicular to the length L of the drive plates 10. It is therefore the width of the slots 11 which is parallel to the length L of the plates
• the drive plates 10 forming the first circumferential row 15a and the second adjacent circumferential row 15b have for example at their free ends between three and five slots 11 spaced by a minimum length equal to the thickness of the slots 11. According to another embodiment, the spacings between the slots 11 are not necessarily regular. Two neighboring slits 11 may for example be closer to each other than two other neighboring slits 11.
• the drive plates 10 forming a third circumferential row 15c starting from the input end 8a have a length L at least twice that of the drive plates 10 forming a first circumferential row 15a and a second circumferential row 15b adjacent located at the inlet end 8a.
• the drive plates 10 forming the third row 15c have for example a length L of fifty-five centimeters. They have at their free ends between three and five slots 11 spaced at a minimum length equal to three times the thickness of the slots IL The spacing between the slots 11 is therefore for example between three and twenty centimeters.
• the drive plates 10 forming the fourth, fifth and sixth circumferential rows 15d, 15e, 15f starting from the input end 8a have a length L equal to that of the drive plates forming the third circumferential row 15c starting from the entry end 8a.
• the drive plates 10 forming a fourth, fifth and sixth rows 15d, 15th, 15f therefore have for example a length L of fifty-five centimeters.
• the drive plates 10 of rows 15d, 15e and 15f have free ends without slots 11.
• brackets 16 which position the fixing walls 12 of the drive plates 10 forming the third, fourth, fifth and sixth circumferential rows 15c, 15d, 15e and 15f adjacent to the inner periphery of the cylindrical drum 8.
• the brackets 16 are regularly distributed along the drive plates 10. Two neighboring brackets 16 are, for example, eleven and a half centimeters apart.
• the drive plates 10 of a last circumferential row 15g counted from the input end and located at the output end 8b are longer than the drive plates 10 of the other circumferential rows 15a to 15f.
• the drive plates 10 of the last circumferential row 15g have for example a length L of eighty centimeters.
• the last row circumferential 15g located at the outlet end 8b also corresponds to the seventh circumferential row 15g starting from the inlet end 8a.
• the drive plates 10 forming the last circumferential row 15g counted from the inlet end 8a and located at the outlet end 8b comprise for example a fixing wall 12, a junction wall 13 and a wall end 14 without slots 11.
• the angle b between the fixing wall 12 and the junction wall 13 is for example between 90 ° and 110 °.
• the angle g between the junction wall 13 and the end wall 14 is for example between 100 ° and 150 °.
• the walls 12, 13 and 14 can give a "claw" shape to the drive plates 10 forming the last row 15g.
• This "claw" shape makes it possible in particular to accentuate the concavity of the drive plates 10 forming the last row 15g. This makes it possible in particular to shovel a larger quantity of aggregates during the rotation of the cylindrical drum 8.
• brackets 16 which position the fixing walls 12 of the drive plates 10 of the last row 15g on the inner periphery of the cylindrical drum 8.
• the brackets 16 are regularly distributed along the drive plates 10.
• Two neighboring brackets 16 are for example twenty-two centimeters apart.
• the cylindrical drum 8 is driven in rotation around its axis of revolution X.
• the aggregates and fines are loaded into the drying device 5 and more specifically into the cylindrical drum 8 via its inlet end 8a.
• the rotational movement of the cylindrical drum 8 disperses the aggregates and fines on the inner periphery of the cylindrical drum 8.
• the drive plates 10 collect some of the aggregates and fines in the concave surface formed by the fixing wall 12 and the end wall 14. The plates
• the drive plates 10 forming the first circumferential row 15a and the second circumferential row 15b adjacent located at the 'inlet end 8a are for example very short.
• the limited length L of these drive plates 10 allows the aggregates to stay longer in hot air, this can promote their temperature rise and thus accelerate their drying.
• the drive plates 10 forming the third, fourth, fifth and sixth circumferential rows 15c, 15d, 15e and 15f starting from the input end 8a are a little longer.
• the greater length L of the drive plates 10 forming the rows 15c, 15d, 15e and 15f can reduce the time of presence of the aggregates in the hot air diffused by the burner 9a. This makes it possible in particular to limit the risk of burning the aggregates.
• the drive plates 10 forming the first circumferential row 15a, the adjacent second circumferential row 15b and the third circumferential row 15c have at their free ends cut slots 11. These cut-out slots 11 can allow the fines mixed with the aggregates poured into the cylindrical drum 8 to be quickly removed. Separating the fines from the aggregates at the inlet end 8a of the cylindrical drum 8 can make it possible to reduce the drying time of the aggregates.
• the claw shape of the drive plates 10 forming the last row 15g starting from the inlet end 8a makes it possible to increase the concave surface of the drive plates 10. This makes it possible to increase the quantity of aggregates shoveled during of the rotation of the cylindrical drum 8 around its axis of revolution X. The time of presence of the aggregates in the hot or even scorching air diffused by the burner 9a can then be limited.
• the claw shape of the drive plates 10 forming the last row 15g makes it possible, for example, to prevent burning of the aggregates. It also helps to promote

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Sustainable Development (AREA)
• Microbiology (AREA)
• Drying Of Solid Materials (AREA)
• Road Paving Machines (AREA)

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Cited By (1)

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• 2019
  • 2019-07-31 FR FR1908751A patent/FR3099496B1/fr not_active Expired - Fee Related
• 2020
  • 2020-07-30 DK DK20745228.5T patent/DK4004288T3/da active
  • 2020-07-30 WO PCT/EP2020/071484 patent/WO2021019000A1/fr not_active Ceased
  • 2020-07-30 FI FIEP20745228.5T patent/FI4004288T3/fi active
  • 2020-07-30 PL PL20745228.5T patent/PL4004288T3/pl unknown
  • 2020-07-30 EP EP20745228.5A patent/EP4004288B1/de active Active

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