WO1996016228A1 - An asphalt plant - Google Patents

An asphalt plant Download PDF

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Publication number
WO1996016228A1
WO1996016228A1 PCT/BR1995/000058 BR9500058W WO9616228A1 WO 1996016228 A1 WO1996016228 A1 WO 1996016228A1 BR 9500058 W BR9500058 W BR 9500058W WO 9616228 A1 WO9616228 A1 WO 9616228A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
mixing
feeding
drying drum
asphalt
Prior art date
Application number
PCT/BR1995/000058
Other languages
French (fr)
Inventor
Alfredo José SALLA
Original Assignee
Svedala Faço Ltda.
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
Priority to BRPI9404618-2 priority Critical
Priority to BR9404618A priority patent/BR9404618A/en
Application filed by Svedala Faço Ltda. filed Critical Svedala Faço Ltda.
Publication of WO1996016228A1 publication Critical patent/WO1996016228A1/en

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027Mixing in a rotary receptacle
    • E01C19/1036Mixing 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
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027Mixing in a rotary receptacle
    • E01C19/1031Mixing in a rotary receptacle the mixture being discharged continuously
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C2019/1081Details not otherwise provided for
    • E01C2019/1086Mixing containers having concentric drums
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, 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
    • E01C19/10Apparatus 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
    • E01C2019/1081Details not otherwise provided for
    • E01C2019/109Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow

Abstract

An asphalt plant, comprising an aggregate drying rotary drum (10) and a mixing drum (20) externally mounted to the drying drum (10), to roll with it and to define an annular mixing chamber (CM) around a certain extension of the drying drum (10), from the lower end (12) of the drying drum (10), said mixing drum having a feeding end (21), to receive the heated and dried aggregate from the drying drum (10) and liquid asphalt from an appropriate source, and an opposite discharge end (22) for the delivery of asphalt paving composition produced inside the annular mixing chamber (CM). This chamber is provided with conducting-mixing means (23, 23a, 28) mounted to at least one of the parts defined by the drying drum (10) and mixing drum (20), causing the mixing and displacement of the asphalt paving composition inside the annular mixing chamber (CM).

Description

AN ASPHALT PLANT

Field of the Invention

The present invention relates to an asphalt plant for the continuous production of asphalt paving composition for paving streets and roads, using dried and heated aggregate, to which liquid asphalt is mixed. Background of the Invention It is well known a type of asphalt plant of intermittent or continuous production, in which the aggregate is continuously fed by the upper end of a rotary drum having its longitudinal axis inclined in respect to the horizontal, the aggregate being revolved, heated, dried and conducted along the rotary drum, towards the opposite lower end thereof, in order to be delivered to a separate mixing device. As the dried and heated aggregate is discharged into the mixing device, it is mixed with liquid asphalt which is also supplied to said mixing device, the resulting asphalt paving composition being then discharged from the lower end of the drum continuously or in batches. In this type of asphalt plant, the heating and drying operations of the aggregate are promoted by a counterflow of hot gases produced by a burner placed close to the discharge lower end of the rotary drum.

Said prior art asphalt plants have the advantage of avoiding the presence of liquid asphalt, or even of asphalt contained in recycled pavement material, in the heated internal region of the rotary drum and consequently avoiding the burn of the asphalt.

Further, since there is no asphalt in the region where the aggregate is revolved and dried, there is eliminated the conduction, by the gas flow of particulate material impregnated with asphalt, towards the filtrating devices of the exhaust gases, a situation in which said filtrating devices are affected in terms of constructive complexity and maintenance. A positive aspect of this asphalt plants that can also be mentioned is the possibility of using drying gases with drum inlet temperatures on levels only sufficient to guarantee a thermal exchange in the exit thereof, at the region where the cold aggregate enters into the rotary drum.

However, despite the advantages mentioned about, the asphalt plants of continuous or intermittent production with a mixing device being separated from the rotary drying drum present the inconveniences of having a high manufacturing cost, the driving of two separate components and difficult transportation, when considering the mixing drum plants to be disclosed hereinafter. Furthermore, said plants have low thermal efficiency in function of the requirement of independent heating of the mixer, even with the gain obtained with the counterflow of gases in relation to the aggregate inside the drying drum. In another known type of continuous production plant, the aggregate is fed through the inlet upper end of an inclined rotary drum. In said end there is also mounted the burner for the production of a hot gas drying flow, moving in the same direction of the aggregate displacement along the rotary drum. In this kind of plant (mixing drum) , the drying and heating operations of the aggregate and the mixing thereof are carried out inside the rotary drum which operates both as a drier and as a mixer. The liquid asphalt is introduced into the drum at a point sufficiently away from the inlet upper end of the aggregate and of the hot gas flow, in order to avoid the burn of liquid asphalt. The dried and heated aggregate and the liquid asphalt are mixed in the lower portion of the rotary drum, allowing the asphalt paving composition to be discharged through the lower end of the drum. These plants that use the mixing-drying rotary drums are easily movable and present a less costly operation. However, since the liquid asphalt and the recycled pavement material are fed to the same drying drum of the aggregate, this drum must have a sufficient length to promote the drying of the aggregate without the risk of burning the asphalt introduced at a mid-point of the drum, besides an adequate mixture of said asphalt with the aggregate. A further problem of these drying-mixing drums is that they are not thermically efficient like the gas flow drying drums in counterflow drying drums because the aggregate is exposed to the highest temperatures of the gas flow while it is still cold, being dislocated to a cooler zone of the drying drum while being heated. Thus, the gases are conducted to leave the drum outlet lower end at a temperature higher than the hot dry aggregate, i.e., higher than about 150°C, requiring the use of special sleeves in the sleeve filter and causing an early wear to the parts that process these gases.

Moreover, these plants with drying-mixing drums allow the hot gases flow to carry particles impregnated with asphalt, causing obstructions in the dust ducts, washers and filter sleeves and making it difficult or even impossible to have an efficient recovery of the particulate material.

Aiming to minimize the problems presented by the two types of asphalt plants mentioned above, there has been developed an asphalt plant for the continuous processing of asphalt paving composition having only one inclined rotary drum for drying the aggregate through a hot gas flow, moving counter to the downward direction of the aggregate along the extension of the rotary drum, the mixture of the liquid asphalt and of the recycleable pavement material with the aggregate being carried out inside a stationary tubular sleeve involving concentrically the lower portion of the rotary drum, so as to define with the latter an annular chamber where the aggregate coming from the rotary drum as well as the liquid asphalt and the recycled pavement material are fed.

In this prior art solution, the lower portion of the rotary drum is externally provided with lifters or mixing blades, in order to transform said drum portion in a kind of mixing rotor rotating inside the stationary sleeve. This operation allows the dried and heated aggregate to be mixed with the asphalt at a region external to the drying drum, with all the advantages inherent to the system where the mixing device is separated from the drying device, but without the disadvantages of high manufacturing cost or the driving of two separate components of difficult transportation. This solution is compact, relatively simple, thermically efficient and does not present the problems of contaminating the filters with asphalt. Despite having all the advantages mentioned above, these plants in which the mixer is defined by a stationary sleeve external to the drum present some inconveniences that jeopardize their efficiency in terms of energy, durability, cost and maintenance. This known plant uses the principle of forced movement adopted in pugmill type mixers, in which the mixing operation is made by the relative movement between the blades externally mounted to the rotating drying drum and the stationary sleeve. The shape and arrangement of the blades permit the displacement of the material. This operational system results in a high energetic consumption to overcome the great friction between the rotating blades and the stationary sleeve. Due to the friction level generated, the blades and the sleeve coating need to have a periodic substitution, even said parts being obtained from special wear resistant materials, in order to increase the working life of the components. The working life of these parts, together with the high cost for obtaining special materials and also the time necessary for the periodic substitutions, make this solution economically infeasible. It should also be observed that the relative movement between the external blades of the drying drum and the sleeve can conduct to the wedging of stones between the blades and the sleeve, causing high energy consumption, high friction level and jolts.

Besides the negative aspects discussed above, the fixed external sleeve construction requires the positioning of one of the supporting rings exactly at the burner region, since the drying drum is projected beyond the sleeve, to reach the support point of the dry aggregate outlet lower end. In this condition, the mechanical assembly including a race, rollers, bearings, etc. is exposed to the high temperatures generated by the burner, being affected by the same problems mentioned above in relation to the working life and cost of the parts subjected to strong friction wear. Due to the friction between the mutually moving parts and the constant wedging of stones, the drum is driven by a pinion gear assembly placed in the drying drum. This driving operation is subjected to jolts, which are transmitted to the reducer and to the engine, causing damages in the whole electrical-mechanical driving system. The driving made through a pinion-gear assembly presents high purchase and replacement costs and forces the user to spend too much in maintenance with constant lubricant substitutions, mechanical gearing regulations, alignment and absorption of dilatations, cleaning, etc.

The fixed sleeve construction external to the drying drum requires the provision of a feeding chute for recycled pavement material in the upper portion of the sleeve, requiring a high plant and conducting to frequent obstructions of the chute, due to excessive moisture, or to the aggregation of fine material on the walls, reducing the material flow. Finally, it should be observed that the plant construction or the substitution of its blades conduct to the necessity of making many adjustments in the field to obtain the necessary concentricity between the sleeve and drying drum. Disclosure of the Invention

It is a general object of the present invention to provide an asphalt plant of the continuous production type, which has an asphalt mixer external to the aggregate rotating drying drum, and which is of a simple and compact construction of easy transportation and efficient technical utilization.

It is a more specific object of the present invention to provide an asphalt plant as defined above, presenting a relative reduction in energy consumption, and in the wear and cost of the mixing means and driving means of the rotating drying drum. These and other objectives of the present invention are achieved by an asphalt plant for the continuous production of asphalt paving composition, comprising: a rotating drying drum, inclined in relation to the horizontal and having an upper end and a lower end; an aggregate feeding means placed close to the drying drum upper end; a heating means, located close to the drying drum lower end, for heating and drying the aggregate fed to the latter,- and a driving means for driving the drying drum for rotation.

According to the invention, the asphalt plant further comprises, in a particular way, a mixing drum mounted externally to the drying drum, in order to rotate with the latter and define an annular mixing chamber along a determined longitudinal extension of the drying drum from its lower end, said mixing drum having a feeding end and an opposite discharge end; an aggregate delivering means, to deliver the heated and dried aggregate from the drying drum lower end to the inside of the annular mixing chamber, through the feeding end of the mixing drum,* a means for feeding liquid asphalt into the inside of the annular mixing chamber through the feeding end of the mixing drum,* conducting-mixing means located inside the annular mixing chamber and affixed to at least one of the parts defined by the drying drum and mixing drum, causing the mixture of the aggregate and liquid asphalt which are fed into the annular mixing chamber, as well as the displacement of the resulting asphalt paving composition towards the mixing drum discharge end; and supporting means, respectively actuating against the drying drum upper end portion and the mixing drum median portion, in order to support the rotary assembly formed by the mixing drum and drying drum attached to each other. The proposed construction uses the "mixing in drum" principle adopted in the conventional mixing drums, in which the mixing operation is obtained by homogenizing chutes and plates adequately disposed inside the drying mixing drum, providing the material displacement, and by action of gravity that actuates in the diametral direction of the drum, causing the fall of the asphalt paving composition being prepared and its homogenization. With the new constructive disposition, the friction and wedging of stones between the rotating blades and fixed external sleeve are eliminated, and consequently all the problems related to energetic consumption, cost and working life of the special materials for the mixing parts subjected to wear. Moreover, the construction proposed herein make possible the installation of the rolling races, of their supports and driving means in low temperature regions, simplifying and reducing the production costs of the driving means and increasing the working life thereof.

The provision of an external mixing drum attached to the internal drying drum allows the introduction of the recycled pavement material in the feeding end of the mixing drum, reducing the plant height and the length of the feeder, eliminating the necessity of a feeding chute. This plant can be delivered to the user completely assembled and it is not subjected to the ocurrence of misadjustments or misalignments of the relative positioning between the drums and their supporting and driving means. Brief Description of the Drawings The present invention will be described below, with reference to the attached drawings, representing a preferred embodiment of the invention, and in which: Fig.l is a simplified longitudinal vertical sectional view of an asphalt plant built according to the present invention;

Fig.lA is a longitudinal sectional view of the drying drum and of the mixing drum of the plant illustrated in figure 1; and Fig.2, 3, and 4 are transversal vertical sectional views of the asphalt plant, respectively taken along lines I-II, III-III and IV-IV of figure 1. Best Mode for Carrying Out the Invention Referring to the attached drawings, the present asphalt plant comprises a drying drum 10, mounted in order to rotate around its longitudinal axis inclined in relation to the horizontal and having an upper end 11 and a lower end 12. The drying drum 10 can be mounted to a support structure which can have the form of a wheeled chassis, not illustrated, to transport the plant between different operational places.

Around the drying drum 10 there is mounted an end mixing drum 20, with concentric diameter and attached to the drying drum 10, defining therewith an annular mixing chamber (CM) . The external mixing drum 20 has a feeding end 21 and an opposite discharge end 22, in the illustrated embodiment the feeding end 21 of the mixing drum 20 being projected beyond the lower end 12 of the drying drum 10, while the discharge end 22 is placed around the median region of the drying drum 10. The mixing drum 20 is provided with lifters 23, 23a which are designed to promote the mixing and displacement operations of the asphalt composition being formed, along the mixing drum 20 and towards its discharge end 22. Besides the mixing lifters 23 and 23a, lifters 28 are also provided, mounted to both drums, working also as mounting and mixing elements between the two tubular pieces. The mixing lifters 23 can be affixed to one or other of said drums, in which case additional spacing elements are necessary to attach the mixing drum 20 to the spacing drum 10. The rotary assembly formed by the drying drum 10 and the mixing drum 20 is supported by two pairs of lower rollers 14 and 24, the rollers of each pair being angularly spaced from each other in a plane tranversal to the longitudinal axis of the rotary assembly and mounted in respective bearings 15 and 25 affixed to the supporting structure of the rotary assembly. A pair of idle rollers 14 acts against a annular rolling race 16 affixed around the circumference of the upper end portion of the drying drum 10, while the other pair of driving rollers 24 acts against a rolling race 26 affixed around the circumference of the median portion of the mixing drum 20. An appropriate motor-reductor assembly 27 is coupled to the driving rollers 24 maintained in contact with the annular rolling race 26 external to the mixing drum 20, to provide the rotation of the assembly formed by the drying drum 10 and the mixing drum 20.

Close to the lower end 12 of the drying drum there is provided a burner 30 which directs a flame through a fixed burning chamber 31 adjacent to the lower end 12 of the drying drum 10 and directing to the inside thereof a flow of high temperature burning gases. The hot gas flow moves along the drying drum 10, towards its upper end 11. To the burner 30, of any adequate conventional construction, there is operatively coupled a fan 32, supplying the burner 30, through a duct 33, with primary air sufficient to provoke the fuel atomization and contribute in part with the estechiometric volume of air necessary to an adequate combustion. Close to the upper end 11 of the drying drum, there is adapted a virgin aggregate feeding means which, in the illustrated embodiment, takes the form of a conveyor belt 40, whose discharge end is positioned so as to transfer the virgin aggregate to the inside of the drying drum 10.

The drying drum 10 is internally provided with lifters 13 disposed in a way to cause, upon the rotation of the drum, the circumferential lifting and the diametral fall of the aggregate, provoking the cascating and the homogenization of the latter and its displacement towards the lower end 12 of the drying drum 10 in counterflow relative to the hot gas flow produced by the burner 30 and allowing the gas heat transfer to the aggregate. An exhaust pipe 50 is mounted, in a stationary manner, close to the upper end 11 of the drying drum 10, to draw the combustion gases that have moved along the drying drum and also to induce a secondary air flow to the inside of said drum. This flow of combustion gases carries the water steam generated with the drying of the aggregate, as well as the aggregate solid particles, which are conducted to a cyclone 60, where the particulate material looses velocity, being collected and conducted by a conveyor 61 to the feeding end 21 of the mixing drum 20, where it will be mixed with the asphalt paving composition being formed. The cyclone 60 can be replaced by any other filtrating device of particulate material carried by gas flows, such as a sleeve filter or washing system or it can be associated to any of said devices. The aggregate is homogenized, heated and dried along its way through the inside of the drying drum 10, being discharged through the lower end 12 of said drum to the inside of the mixing drum 20, where it will be mixed with liquid asphalt fed through the asphalt pump 70 and respective feeding duct 71 that penetrates into the mixing chamber CM through the feeding end 21 of the mixing drum 20. The mixing drum 20 can also receive, through its feeding end 21, recycled pavement material fed by its conveyor belt 80. The mixing drum 20 is further internally provided with internal spiral lifters 23a at its feeding end portion, in order to receive the aggregate and the recycled pavement material, imparting thereon the longitudinal conducting movement towards the discharge end 22. The asphalt paving composition obtained in the mixing drum 20 is discharged into a collecting box 90, drum 20 being provided with scrapers 91 for conducting the asphalt paving composition to a discharge gutter 92. Although the drawings illustrate a cylindrical shaped mixing drum 20, it should be understood that this component can present a conical shape or any other geometric form preserving the same operational characteristics.

A similar situation can be associated to the drying drum 10, which may have staggered diameters at the upper or lower ends thereof, providing a higher efficiency of the assembly and the withdrawal of the combustion chamber 31.

The mixing drum 20 is preferably provided with an external heat insulating means 29, to optimize the utilization of the heat directed to the mixing chamber CM from the lower end region of the drying drum 10, adjacent to the burner 30. The constructive arrangement of the rotary assembly and the heat insulation of the mixing drum 20 allow the provision of improved thermal efficiency relatively to the plants which use a counterflow system for drying the aggregate.

Claims

CLAIMS 1- An asphalt plant, for the continuous production of asphalt paving composition, comprising a rotary drying drum (10) , inclined in relation to the horizontal and having a upper end (11) and a lower end (12) ,* an aggregate feeding means (40) disposed adjacent to the upper end (11) of the drying drum (10) ,- heating means (30) , disposed adjacent to the lower end (12) of the drying drum (10) , in order to heat and dry the aggregate fed to the drum,- and driving means (27, 24) rotatively driving the drying drum (10) , said asphalt plant being characterized in that it comprises: a mixing drum (20) externally affixed to the drying drum (10) , to roll with it and to define an annular mixing chamber (CM) around a certain longitudinal extension of the drying drum (10) , from the lower end (12) thereof, said mixing drum (20) having a feeding end (21) and an opposite discharge end (22) ; an aggregate discharge means for discharging the dried and heated aggregate from the lower end (12) of the drying drum (10) to the inside of the annular mixing chamber (CM) , by the feeding end (21) of the mixing drum (20) ; a liquid asphalt feeding means (70, 71) disposed inside the annular mixing chamber (CM) through the feeding end (21) of the mixing drum (20) ,* conducting-mixing means (23, 23a, 28) disposed inside the annular mixing chamber (CM) and affixed to at least one of the parts defined by the drying drum (10) and mixing drum (20) , causing the mixing of the aggregate and liquid asphalt which are fed to the annular mixing chamber (CM) , as well as the displacement of the produced asphalt paving composition, towards the discharge end (22) of the mixing drum (20) ,* and supporting means (14, 24) respectively acting against the upper end portion of the drying drum (10) and the median portion of the mixing portion (20) , to support the rotary assembly formed by the drying drum (10) and mixing drum (20) attached to each other.
2- An asphalt plant, according to claim 1, characterized in that it further comprises a recycled pavement material feeding means (80) for feeding the recycled pavement material to the inside of the annular mixing chamber (CM) by the feeding end (21) of the mixing drum (20) .
3- An asphalt plant, according to claim 1, characterized in that the feeding end (21) of the mixing drum (20) is projected beyond the lower end (12) of the drying drum (10) .
4- An asphalt plant, according to claim 3, characterized in that the discharge means for discharging the heated and dried aggregate from the drying drum (10) is defined by the lower end (12) of the drying drum (10) .
5- An asphalt plant, according to claim 1, characterized in that the supporting means is defined by two pairs of rollers (14, 24), one pair (14) acting on an annular rolling race (16) mounted around the drying drum (10) and the other pair (24) acting on an annular rolling race (26) mounted around the mixing drum (20) . 6- An asphalt plant, according to claim 5, characterized in that the driving means comprises a motor-reductor (27) , driving the driving rollers (24) acting against the annular rolling race (26) of the mixing drum (20) . 7- An asphalt plant, according to claim 1, characterized in that the mixing drum (20) has a frusto-conical shape, with its smaller base defining the feeding end (21) . 8- An asphalt plant, according to claim l, characterized in that the feeding end (21) of the mixing drum (20) receives the discharge end of a recycled pavement material conveyor (80) . 9- An asphalt plant, according to claim 1, characterized in that the conducting-mixing means of the mixing chamber (CM) is defined by lifters (23) , disposed along the longitudinal extension of the chamber, and by internal helical lifters (23a) provided at the feeding end region of the mixing drum (20) .
PCT/BR1995/000058 1994-11-24 1995-11-22 An asphalt plant WO1996016228A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BRPI9404618-2 1994-11-24
BR9404618A BR9404618A (en) 1994-11-24 1994-11-24 Asphalt plant

Publications (1)

Publication Number Publication Date
WO1996016228A1 true WO1996016228A1 (en) 1996-05-30

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Application Number Title Priority Date Filing Date
PCT/BR1995/000058 WO1996016228A1 (en) 1994-11-24 1995-11-22 An asphalt plant

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BR (1) BR9404618A (en)
CO (1) CO4480784A1 (en)
PE (1) PE61796A1 (en)
WO (1) WO1996016228A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085518A1 (en) * 2008-02-01 2009-08-05 Eurovia Method of manufacturing a bituminous coating with simultaneous insertion of the binder and a part of the solid mineral fractions in the mixer
CN103981791A (en) * 2014-05-27 2014-08-13 湖南三一路面机械有限公司 Asphalt mixing plant as well as finished product warehouse and emptying method of asphalt mixing plant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725337A1 (en) * 1977-06-04 1978-12-07 Wibau Gmbh Asphalt mixture prepn. - by drying additives in inner heated drum and blending with bitumen and fillers in outer drum in which mixture is degassed
DE3414365A1 (en) * 1984-04-16 1985-10-24 Erich Dipl Ing Schambeck Device for treating bituminoese mixed material, in particular road construction asphalt
WO1992011983A1 (en) * 1990-12-27 1992-07-23 Astec Industries, Inc. AGGREGATE DRYER FOR USE WITH ASPHALT PLANT HAVING REDUCED NOx EMISSIONS
EP0562234A1 (en) * 1992-02-04 1993-09-29 MATRA S.r.l. Drum mixer-drier for the continuous preparation of bituminous mixes with recycling of reclaimed materials
US5261738A (en) * 1992-09-25 1993-11-16 Astec Industries, Inc. Asphalt drum mixer with bypass for controlling the temperature of the exhaust gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725337A1 (en) * 1977-06-04 1978-12-07 Wibau Gmbh Asphalt mixture prepn. - by drying additives in inner heated drum and blending with bitumen and fillers in outer drum in which mixture is degassed
DE3414365A1 (en) * 1984-04-16 1985-10-24 Erich Dipl Ing Schambeck Device for treating bituminoese mixed material, in particular road construction asphalt
WO1992011983A1 (en) * 1990-12-27 1992-07-23 Astec Industries, Inc. AGGREGATE DRYER FOR USE WITH ASPHALT PLANT HAVING REDUCED NOx EMISSIONS
EP0562234A1 (en) * 1992-02-04 1993-09-29 MATRA S.r.l. Drum mixer-drier for the continuous preparation of bituminous mixes with recycling of reclaimed materials
US5261738A (en) * 1992-09-25 1993-11-16 Astec Industries, Inc. Asphalt drum mixer with bypass for controlling the temperature of the exhaust gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085518A1 (en) * 2008-02-01 2009-08-05 Eurovia Method of manufacturing a bituminous coating with simultaneous insertion of the binder and a part of the solid mineral fractions in the mixer
CN103981791A (en) * 2014-05-27 2014-08-13 湖南三一路面机械有限公司 Asphalt mixing plant as well as finished product warehouse and emptying method of asphalt mixing plant

Also Published As

Publication number Publication date
BR9404618A (en) 1997-03-04
CO4480784A1 (en) 1997-07-09
PE61796A1 (en) 1997-01-01

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