JP4002588B1 - Manufacturing method of asphalt composite - Google Patents

Abstract

[PROBLEMS] To reduce the equipment cost and simplify the processing process without causing oil combustion or deterioration, oil adhesion to the inside of the drum, and insufficient heating temperature of the aggregate during heating with a dryer. While providing a method for producing high-quality asphalt composites from asphalt waste.
A single-grain crushed stone composed of a plurality of components having different particle size ranges obtained from asphalt waste is supplied to a dryer and heated, and each heated component is supplied to an mixing device with an additive and asphalt and mixed. A method for producing asphalt composite material, wherein the dryer is a rotating drum that is inclined so as to be lowered from one end portion toward the other end portion, and a flame from one end portion to the other end portion in the rotating drum. A heating burner that radiates the flame and a dryer with an inner cylinder that covers the periphery of the flame, and in the heating process with the dryer, all of the single-grain crushed stone consisting of multiple components is supplied to the inside from one end side of the rotating drum And take out from the other end side.
[Selection] Figure 1

Description

  The present invention relates to a method for producing an asphalt mixture, and more particularly to a method for producing an asphalt mixture using asphalt waste as a raw material.

In recent years, a part of asphalt waste generated due to repair of paved roads, etc. has been reused as a raw material for asphalt mixture.
FIG. 7 is a flow sheet showing a conventional method for producing asphalt mixture using asphalt waste as a raw material.

In the conventional method shown in FIG. 7, the asphalt lump (waste material) is supplied to the crushing device (A) and crushed to form recycled aggregate (B) having a particle size of 13 mm or less, and then stored in the hopper (J). Is done.
On the other hand, new aggregates are accommodated in the hoppers (C) to (H). Specifically, screenings for the hopper (C), fine sand for the hopper (D), coarse sand for the hopper (E), 2.5 to 5 mm components for the hopper (F), and hopper (G) for the hopper (G) Components of 5 to 13 mm and components of 13 to 20 mm are accommodated in the hopper (H), respectively. The hopper (I) is a spare one.
The new aggregate accommodated in the hoppers (C) to (H) is directly supplied to the heated dryer (K), heated, classified by the hot screen (M), and then a measuring device (N ).
On the other hand, the recycled aggregate stored in the hopper (J) is supplied to the indirect heating dryer (L) and heated, and then supplied to the measuring device (N) via the recycled material surge bin (not shown). The
Aggregates (new aggregates and recycled aggregates) measured by the measuring device (N) are supplied to the mixer (R) and mixed together with stone powder, additives, and asphalt. In the figure, (O) is a stone powder tank, (P) is an additive tank, and (Q) is an asphalt tank.
The mixture obtained by the mixing by the mixer (R) is loaded into the silo (S) as a recycled asphalt mixture and is reused.

In the above conventional method, the recycled aggregate (B) obtained by crushing the asphalt lump contains a large amount of oil, and if heated with a direct heating dryer, the oil will burn or deteriorate, so the indirect heating type Heated by a dryer (L).
However, since the indirect heating dryer has a lower heating capacity than the direct heating dryer, it is difficult to raise the temperature of the aggregate to the optimum temperature for the subsequent mixing step. When oil (asphalt) adheres, it has become more difficult to raise the temperature.

As a technique that can solve such problems of the prior art, there is a technique disclosed in Patent Document 1 below.
In this method, after the asphalt waste material is crushed in the previous step, the pitch portion coated on the crushed material is removed by a polishing apparatus or the like, and this is sieved to obtain a plurality of components having different particle size ranges. It is sent to the subsequent process shown in.
In the post-process, a plurality of components having different particle size ranges (0 to 2.5 mm, 2.5 to 5 mm, 5 in the illustrated example) accommodated in different hoppers (A), (B), (C), (D), and (E), respectively. 4 to 13 mm and 13 to 20 mm), the components of 0 to 2.5 mm that contain a lot of oil (pitch) are indirectly heated with an indirect heating dryer (H1), and the remaining oil is low. Ingredients are heated directly in the direct heating dryer (H2), and both of these heated ingredients are mixed with the additive supplied from the additive tank (I) and the asphalt supplied from the asphalt tank (J) (K ) To obtain a recycled asphalt mixture.

  In the method disclosed in Patent Document 1, a small-diameter component having a large oil content is indirectly heated at a low temperature using an indirect heating dryer, whereas a component having a small oil content has a high heating capability. Mixing the two directly after heating at a high temperature in the dryer can prevent the combustion and deterioration of the oil, and the shortage of heating in the indirect heating dryer can be compensated by heating with the direct heating dryer. It is possible to raise the temperature of the aggregate to the optimum temperature for the process.

  Thus, the method described in Patent Document 1 can solve the problems of the conventional method described above, and is an excellent method capable of producing a high-quality asphalt mixture, Since two types of dryers must be used in combination, there is a problem in that the processing steps are complicated and the equipment cost is high as compared with the conventional method.

Japanese Patent No. 3612030

  The present invention was made to solve the above-mentioned problems of the prior art, and in a method for producing asphalt mixture using asphalt waste as a raw material, in the heating step with a dryer, the combustion and deterioration of oil, It is possible to produce high-quality asphalt composites while reducing the equipment cost and simplifying the processing process without causing oil adhesion inside the drum and insufficient heating temperature of the aggregate. A method is provided.

The invention according to claim 1 supplies only a single-grain crushed stone composed of a plurality of components having different particle size ranges obtained from drainage pavement waste material to a dryer and heats the heated components, and additives and asphalt The asphalt composite material is manufactured by supplying and mixing with a mixing device, and the single-grain crushed stone supplied to the dryer is obtained by removing oil coated on the surface, and as the dryer A rotating drum that is disposed so as to be gradually lowered from one end to the other end, a heating burner that radiates a flame from one end to the other end in the rotating drum, use only dryer with a cylindrical inner mounted so as to cover the periphery of the flame of the heating burner in the heating step in the drier, a single particle size crushed stone consisting of a plurality of components Hand, relates to a method for producing asphalt mixture, characterized in that taken from one end the other end side is supplied into the drum from the rotating drum of the dryer.

  According to a second aspect of the present invention, a plurality of scraping blades project from the inner peripheral surface of the rotating drum at predetermined intervals in the circumferential direction, and the scraping blades are cylindrically shaped to extend in the drum length direction. 2. The asphalt mixture manufacturing method according to claim 1, wherein the cylindrical member is attached in a state of being floated from an inner peripheral surface of the drum.

In the invention according to claim 3, the length of the inner cylinder is such that the flame protrudes from the tip of the inner cylinder, and at least at the position where the single-grain crushed stone enters the drum, The asphalt composite material manufacturing method according to claim 1, wherein the asphalt composite material has a length that covers the surface.

According to the first aspect of the present invention, in the heating process by the dryer, the aggregate supplied into the drum is not directly heated by the flame, but uses hot air, radiant heat through the inner cylinder, and radiant heat of the flame. Therefore, even if it is an aggregate of a component containing a large amount of oil, it does not cause combustion or deterioration of the oil or adhesion of oil to the inner wall of the drum due to heating. Since it can be heated to a high temperature, it becomes possible to raise the temperature of the aggregate to the optimum temperature for the mixing step, and a high-quality asphalt mixture can be produced. Moreover, compared to a method using two types of dryers, a direct heating dryer and an indirect heating dryer, the equipment cost can be reduced and the processing process can be simplified.
In addition, it is possible to efficiently and effectively use a huge amount of drainage pavement waste material that is discharged with the replacement of drainage pavement that will be started on a large scale in the near future.

  According to the second aspect of the present invention, the scraping blade is a cylindrical member and is provided in a state of being lifted from the inner peripheral surface of the drum, so that the amount of asphalt attached to the inner surface of the rotating drum is greatly reduced. Can be made. For this reason, it is possible to prevent the heating efficiency from being lowered, and it is possible to reduce the labor of the chipping work for removing the deposits.

According to the invention according to claim 3, the amount of radiant heat from the flame to the aggregate is remarkably increased by the flame protruding from the tip of the inner cylinder, and the heating efficiency of the aggregate can be greatly improved. It becomes possible to raise the temperature of the aggregate to a temperature optimum for the mixing process more reliably and in a short time. In addition, by covering the flame around the position where the aggregate enters the drum, it is possible to prevent combustion and deterioration of the oil adhering to the aggregate surface and adhesion of the oil to the drum inner peripheral surface.

Hereinafter, the manufacturing method of the asphalt compound material which concerns on this invention is demonstrated, referring drawings.
FIG. 1 is a flow sheet showing a method for producing an asphalt mixture according to the present invention.
First, a manufacturing apparatus for carrying out the manufacturing method according to the present invention described in the flow sheet will be described.

  The production apparatus includes a plurality of hoppers (1), (2), and (3) each containing single-grain crushed stones (hereinafter referred to as recycled aggregates) made of a plurality of components having different particle size ranges obtained from asphalt waste, Spare hoppers (4) and (5) for storing single-grain crushed stones (hereinafter referred to as new aggregates) obtained from recycled aggregates or new aggregates, and components taken out from the respective hoppers are supplied to the conveying device. Supply device (6), a transport device (7) for transporting each component supplied by the supply device to a dryer, a dryer (8) for taking in and heating the components transported by the transport device, A mixing device (9) for mixing the components heated by the dryer (8) with asphalt.

The hopper (1) contains 0 to 2.5 mm of recycled aggregate, the hopper (2) contains 2.5 to 5 mm of recycled aggregate, and the hopper (3) contains 5 to 13 mm of recycled aggregate. Contained.
The hoppers (4) and (5) are spares as described above, and are used as necessary. For example, it is possible to produce coarse-grained asphalt by containing a 13-20 mm component (recycled aggregate or new aggregate) in the hopper (4). Also, without using the hopper (1), the hopper (2) has a component of 2.5 to 5 mm of recycled aggregate, the hopper (3) has a component of 5 to 13 mm of recycled aggregate, and the hopper (4) has a component of 13 to 20 mm. It becomes possible to manufacture a large particle size asphalt by accommodating the component (recycled aggregate or new aggregate) of 20 to 30 mm in the component (recycled aggregate or new aggregate) and the hopper (5). Furthermore, screenings (new aggregate) in the hopper (1), 2.5 to 5 mm of recycled aggregate in the hopper (2), 5 to 13 mm of recycled aggregate in the hopper (3), and hopper (4) By accommodating coarse sand (new aggregate) in fine sand (new aggregate) and hopper (5), it becomes possible to produce dense grained asphalt.
However, in the present invention, the particle size of the single-grain crushed stone accommodated in each hopper is adjusted according to the blending design of the asphalt composite material (including both asphalt pavement and drainage pavement) as the final product. It can be changed as appropriate.

The feeding device (6) is installed in the vicinity of the outlet of each hopper (1) (2) (3) (4) (5). The belt conveyor (6a) and the belt attached to the belt conveyor It consists of a conveyor with a belt scale comprised from a scale (6b).
The conveyor with a belt scale is a known device that can continuously measure the weight of the object to be conveyed by the belt conveyor (6a) in real time by the belt scale (6b), and is attached to the conveyor, for example. A load detection device (load cell or the like) and a speed detection device, and a control device for calculating a transport weight based on measurement data of these devices.

The control device is a feeder (not shown) for supplying aggregate from the hopper to the belt conveyor (6a) when the calculated transport amount exceeds a preset transport amount target value or when the target value has not been reached. When the feeder is a belt feeder, the belt rotation speed is changed, and when the feeder is a vibration feeder, the frequency is changed to perform feedback control.
As a result, the aggregates in the respective particle size ranges taken out from the hoppers (1), (2), (3), (4), and (5) are always supplied with a preset target value per unit time. While being controlled, it will be supplied to the transfer device (7).

  The transport device (7) is a device for transporting the aggregate (both recycled aggregate and new aggregate) of each component supplied by the supply device (6) to the dryer (8), for example, a belt. Consists of conveyors.

The dryer (8) takes the components (recycled aggregate and new aggregate) conveyed by the conveying device (7) and heats them.
FIG. 2 is a schematic view showing the structure of the dryer (8), where (a) is a front sectional view and (b) is a sectional view taken along line AA. In addition, the arrow in a figure has shown the flow direction of the aggregate.
The dryer (8) includes a rotating drum (80) disposed so as to be gradually lowered from one end (inlet side) to the other end (outlet side), and in the rotating drum (80). The heating burner (81) which radiates | emits a flame toward one end part from the other end in FIG. 1, and the inner cylinder (82) with which the circumference | surroundings of the flame of this heating burner (81) were mounted | worn are provided.

  The inner cylinder (82) is a cylindrical member made of heat-resistant steel or the like, and the diameter of the inner cylinder (82) is about ½ of the inner diameter of the rotating drum (80). 80) from one end to about 1/5 to 1/3 of the drum length.

Thus, the inner cylinder (82) covers the flame around the heating burner (81), so that the aggregate supplied into the drum from one end of the rotating drum (80) does not directly contact the flame, It is heated by hot air, radiant heat from the peripheral surface of the inner cylinder, and radiant heat from the flame.
Therefore, increase the temperature of the aggregate to the optimum temperature for the mixing process while preventing the burning and deterioration of the oil (asphalt) adhering to the surface of the recycled aggregate, and further preventing the asphalt from adhering to the inner peripheral surface of the drum. Is possible.

On the inner peripheral surface of the rotating drum (80), a plurality of scraping blades (83) are projected in the circumferential direction at predetermined intervals.
The scraping blade (83) is formed of a cylindrical member extending in the length direction of the rotating drum (80), and is attached in a state of being floated from the inner peripheral surface of the drum.
More specifically, the cylindrical member is made of a metal pipe, and each pipe is fixed to the inner peripheral surface of the drum (80) via the plate (84) only at both ends. As a result, the pipe floats from the drum inner circumferential surface by the height of the plate (84) (about 50 to 100 mm).

  When the scraping blade (83) is a cylindrical member, the aggregate slips along the surface of the scraping blade, so that the oil does not easily adhere. Further, since the lifting blade (83) is in a state of floating from the inner peripheral surface of the drum, a space is secured between the inner peripheral surface of the rotating drum (80) and the lifting blade (83), and the regeneration is performed. Since the aggregate can flow through this space, it is possible to prevent asphalt from adhering to the surface of the scraping blade (83).

Further, the scraping blade (83) is not provided in the vicinity of one end portion in the length direction of the rotating drum (80), and is provided so as to extend over a range from the vicinity of the intermediate portion to the vicinity of the other end portion. ing.
As a result, the aggregate supplied from the one end side of the rotating drum (80) is heated gently without being stirred in the temperature range (about 60 to 100 ° C.) where it is most likely to adhere, and is easily attached. After being heated as described above and flowing along the inclination, it can be stirred and the asphalt can be more effectively prevented from adhering to the raising blade (83).

  In addition, in the vicinity of one end portion of the inner peripheral surface of the rotating drum (80), the aggregate supplied into the drum from the supply port (85) provided on one end portion side of the rotating drum (80) is transferred to the drum. It is preferable to project a spiral feed blade (not shown) for feeding to the vicinity of the intermediate portion.

3 and 4 are schematic front sectional views showing another structure of the dryer (8).
These dryers (8) are obtained by increasing the area of the tip opening (82a) by obliquely cutting off the tip of the inner cylinder (82).
By providing such a tip opening, it becomes possible to apply the radiant heat of the flame to the aggregate from the tip opening, and the heating efficiency can be increased.
3 shows the tip opening (82a) formed on the lower surface side, and FIG. 4 shows the tip opening (82a) formed on the side surface.
As described above, it is preferable to form the distal end opening (82a) on the lower surface side or the side surface side because it is possible to prevent the accumulation of aggregate in the inner cylinder (82).

Further, in the present invention, the inner cylinder (82) as shown in FIG. 2 is replaced with an inner cylinder (82) as shown in FIG. 5 instead of the one covering the entire flame around the heating burner (81). It is possible to use a dryer (8) shortened so as to cover only a part of the periphery of the flame of the heating burner (81).
In this case, the length of the inner cylinder (82) is such a length that the flame protrudes from the tip of the inner cylinder (82), and at least at a position where the aggregate enters the drum, the inner cylinder (82) covers the flame. Is done. Specifically, it is preferable to set the length from one end of the rotating drum (80) to about 1/6 to 1/10 of the drum length.
When the length of the inner cylinder (82) is shortened in this way, the flame protrudes from the tip of the inner cylinder (82), so that the amount of radiant heat from the flame to the aggregate is remarkably increased, and the heating efficiency of the aggregate is increased. The temperature of the aggregate can be significantly improved, and the temperature of the aggregate can be increased to a temperature optimum for the mixing process more reliably and in a short time. In addition, by covering the flame around the position where the aggregate enters the drum, it is possible to prevent combustion and deterioration of the oil adhering to the aggregate surface and adhesion of the oil to the drum inner peripheral surface.

A cyclone (10), a blower (11), a deodorizing furnace (12), and a chimney (13) for purifying the exhaust gas are connected to an exhaust gas discharge port from the dryer (8).
Among these, the deodorizing furnace (12) deodorizes by burning the odor component generated by heating the asphalt attached to the surface of the recycled aggregate.

The mixing device (9) supplies the components extracted from the dryer (8) to the stone powder supplied from the stone powder tank (18), the additive supplied from the additive tank (14), and the asphalt tank (15). Asphalt mixture is produced by this.
A trolley bucket (16) is disposed below the mixing device (9), and the generated asphalt mixture is conveyed to the storage silo (17) by the trolley bucket (16).

Hereinafter, the manufacturing method of the asphalt compound material which concerns on this invention is demonstrated based on the flow sheet of FIG.
First, recycled aggregates composed of a plurality of components having different particle size ranges (in the example shown, three components of 0 to 2.5 mm, 2.5 to 5 mm, and 5 to 13 mm) obtained from the asphalt waste material are respectively separated into separate hoppers (1 ) (2) (3). The spare hoppers (4) and (5) can contain and use different particle size components (13 to 20 mm, 20 to 30 mm components) of recycled aggregate or new aggregate as necessary. .
In addition, the pre-process for obtaining the reproduction | regeneration aggregate accommodated in a hopper is mentioned later.

  The asphalt waste material used as the raw material of the recycled aggregate is made of asphalt pavement waste material, drainage pavement waste material, or a mixture thereof.

  New aggregate is used as necessary to make up for the lack of large-diameter components in recycled aggregates, and is conventionally known from crushed stone, sea gravel, river gravel, land gravel, mountain gravel, etc. The particle size is prepared using the method described above.

The single-grain crushed stone (recycled aggregate) accommodated in the hoppers (1), (2), and (3) is extracted from each hopper by the supply device (6) comprising the conveyor with the belt scale described above. The material is supplied to the transport device (7) while being controlled so that the supply amount per unit time becomes a preset target value. In the present invention, as described in paragraph (0020), according to the type of asphalt mixture to be manufactured, single-grain crushed stone (recycled aggregate or reclaimed aggregate) accommodated in a spare hopper (4) (5) Similarly, the new aggregate is supplied to the conveying device (7).
In this way, the amount of each component supplied from a plurality of hoppers each containing single-grain crushed stones composed of a plurality of components having different particle size ranges is precisely controlled using a conveyor with a belt scale, whereby a dryer A screen that has been used for particle size adjustment after heating can be eliminated, and a reduction in production efficiency due to clogging of the screen can be prevented.

The conveying device (7) supplies the regenerated aggregate (0 to 2.5 mm, 2.5 to 5 mm, 5 to 13 mm) taken out from the hoppers (1), (2), and (3) to the dryer (8).
In addition, when there is a single-grain crushed stone (recycled aggregate or new aggregate) accommodated in the spare hopper (4) (5), the transport device (7) also includes these aggregates together with the dryer (8). ).

Aggregates (recycled aggregates and new aggregates) conveyed by the conveying device (7) are supplied into the drum from a supply port (85) provided at one end of the rotating drum (80). The rotary drum (80) is moved through the drum by the rotation and inclination of the rotary drum (80) and is taken out from the other end.
As described above, the aggregate supplied into the rotary drum (80) is heated by hot air, radiant heat, and radiant heat without directly touching the flame. Asphalt is heated to a temperature (about 160 to 180 ° C.) optimum for the mixing step without burning or deterioration of the asphalt and further adhesion of asphalt to the inner peripheral surface of the drum.
In addition, since the scraping blade (83) is a cylindrical member and is mounted in a state of being lifted from the drum inner peripheral surface, the asphalt adhesion to the scraping blade and the drum inner peripheral surface is greatly suppressed. Can do.

Aggregate heated by the dryer (8) is supplied to the mixing device (9) and supplied from the stone powder tank (18), additive supplied from the additive tank (14), asphalt tank (15 The asphalt mixture which is the final product in the present invention is obtained by mixing with the asphalt supplied from (1).
The obtained asphalt mixture is supplied to the silo (17) by the trolley bucket (16) and stored.

Next, the process (henceforth a pre-process) for obtaining the single grain crushed stone (recycled aggregate) accommodated in each hopper (1) (2) (3) is demonstrated.
FIG. 6 is a flow sheet showing the previous process.
First, the case where an asphalt lump is used as a raw material will be described.

The raw asphalt lump made of asphalt waste or drainage pavement waste is crushed to a certain particle size or less (for example, 40 mm or less) by being supplied to the primary crushing facility (20).
A roll crusher is suitably used as the primary crushing equipment (20).
In the case of using a roll crusher, a fixed amount supply mechanism can be provided by adjusting the number of rotations of the roller.

The raw material crushed to a certain particle size or less by the primary crushing equipment (20) is conveyed to the secondary crushing equipment (22) by the conveying equipment (21) such as a belt conveyor.
The secondary crushing equipment (22) is for removing oil (asphalt) adhering to the surface of the raw material, and a granulator, an impact crusher, a grinder, a grinder, etc. are used.
As the particle sizer, PES Brass (trade name) manufactured by Earth Technica Co., Ltd., Gyropactor (trade name) manufactured by Nakayama Iron Works, Ltd., New Dick (trade name) manufactured by Rasa Industrial Co., Ltd., etc. are suitable. used.
As the impact crusher, an impeller breaker or a super sander (both trade names) manufactured by Earth Technica Co., Ltd. are preferably used.
As a polishing machine, a drum reclaimer (trade name) manufactured by Earth Technica Co., Ltd. is preferably used.
As the grinder, Double Beetle (trade name) manufactured by Maruei Shoji Co., Ltd., Super Gaos (trade name) made of Daito Tochi wooden, etc. are preferably used.

The raw material from which oil (asphalt) adhering to the surface has been removed by the secondary crushing equipment (22) is transported to the screening equipment (24) by the transport equipment (23) such as a belt conveyor.
The sieving equipment (24) is composed of a three-stage screen in which four types of screens with different sieves are combined in the horizontal direction (or inclined direction) and the vertical direction, and the raw material supplied from the secondary crushing equipment (22) is Sort into 5 types of particle size components (recycled aggregates) of ~ 2.5mm, 2.5-5mm, 5-13mm, 13-20mm, 20mm or more.
Of the five types of sorted particle size components (recycled aggregates), three components of 0 to 2.5 mm, 2.5 to 5 mm, and 5 to 13 mm are added to the hopper (1), (2), and (3) shown in FIG. Each is housed.
In addition, the mesh of the screen which comprises secondary crushing equipment (22) can be suitably changed according to the mixing | blending design of the asphalt compound material used as a final product.

Next, the case where an asphalt cutting material is used as a raw material will be described with reference to FIG.
The cutting material used as a raw material is put into an inclined lattice-equipped hopper (25) having a lattice with an inclination angle.
Since the raw material supplied to the inclined hopper with a lattice (25) falls beyond the hopper if it has a certain particle size or more, only a material having a certain particle size or less (for example, 40 mm or less) is accommodated in the hopper (25). The

  In addition, in this invention, instead of throwing the cutting material used as a raw material into the inclined type grid-equipped hopper (25), by supplying it to the primary crushing equipment (20) composed of the above-described roll crusher, a predetermined particle size or less. (For example, 40 mm or less) can be crushed.

The raw material with a fixed particle diameter or less taken out from the inclined hopper with grid (25) or the primary crushing equipment (20) is fed into the above-mentioned secondary crushing equipment (22) by a fixed amount by a fixed amount supply device (26). Supplied.
As the fixed quantity supply device (26), a reciprocating feeder, a belt feeder, a vibro feeder or the like is preferably used.

The raw material supplied to the secondary crushing facility (22) is removed after removing oil (asphalt) adhering to the surface, and is transported to the screening facility (24) by a transport facility (23) such as a belt conveyor. .
The sieving equipment (24) is made from the raw material supplied from the secondary crushing equipment (22) with five kinds of particle size components (recycled from 0 to 2.5mm, 2.5 to 5mm, 5 to 13mm, 13 to 20mm, 20mm or more). (Aggregate)
Among the five kinds of sorted particle size components (recycled aggregates), 5 to 13 mm components are accommodated in the hopper (4) shown in FIG. Moreover, a 13-20 mm component is accommodated in a hopper (5) as needed.

Thus, the single-grain crushed stone (recycled aggregate) obtained through the pre-process shown in FIG. 6 is supplied as a raw material to the post-process shown in FIG. 1 and accommodated in the hopper, and used for manufacturing asphalt composites. Is done.

The recycled aggregate obtained through the pre-process shown in FIG. 6 is a crushing facility for crushing raw asphalt lump or cutting material made of asphalt waste material or drainage pavement waste material by using impact impact action, grinding ore After removing the oil coated on the surface by supplying it to any of the polishing equipment that performs polishing using the action, the sizing equipment with the sizing action, or the grinding equipment with the grinding action, supply it to the sieving equipment Thus, it can be obtained by separately collecting a plurality of components having different particle size ranges.
The recycled aggregate obtained in this way has a reduced amount of oil adhering to the surface because the oil adhering to it is scraped off, so that the oil is combusted in the heating step in the subsequent step (FIG. 1). It is prevented that the diameter is significantly reduced, and the blending design for obtaining an appropriate particle size distribution is facilitated.

  INDUSTRIAL APPLICATION This invention is suitably utilized in order to manufacture asphalt compound material using the recycled aggregate obtained from asphalt waste material or drainage pavement waste material.

It is a flow sheet which shows the manufacturing method of the asphalt compound material concerning the present invention. It is the schematic which shows the structure of a dryer, Comprising: (a) is front sectional drawing, (b) is an AA sectional view. It is a schematic front sectional drawing which shows another structure of a dryer. It is a schematic front sectional drawing which shows another structure of a dryer. It is a schematic front sectional drawing which shows another structure of a dryer. It is a flowchart which shows the process (pre-process) for obtaining a single-grain crushed stone. It is a flow sheet which shows the conventional method of manufacturing asphalt compound material from asphalt waste material. It is a flow sheet which shows another conventional method of manufacturing asphalt compound material from asphalt waste material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hopper 2 Hopper 3 Hopper 4 Hopper 5 Hopper 8 Dryer 80 Rotary drum 81 Heating burner 82 Inner cylinder 83 Raising blade 9 Mixing device

Claims (3)

Only single crushed stone consisting of multiple components with different particle size ranges obtained from drainage pavement waste is supplied to the dryer and heated, and each heated component is supplied to the mixing device together with the additive and asphalt and mixed. A method for producing asphalt composite by
The single-grain crushed stone supplied to the dryer is obtained by removing oil coated on the surface,
As the dryer, a rotating drum disposed so as to be gradually lowered from one end to the other end, and a heating burner that emits a flame from one end to the other end in the rotating drum And using only a dryer having an inner cylinder mounted so as to cover the periphery of the flame of the heating burner,
Asphalt, characterized in that, in the heating step in the dryer, all of the single-grain crushed stone composed of the plurality of components is supplied into the drum from one end of the rotary drum of the dryer and taken out from the other end. A method for producing a composite material.   On the inner peripheral surface of the rotating drum, a plurality of scraping blades protrudes at a predetermined interval in the circumferential direction. The scraping blades are formed of a cylindrical member extending in the drum length direction, and the cylindrical shape 2. The method for producing an asphalt mixture according to claim 1, wherein the member is attached in a state of being floated from the inner peripheral surface of the drum.   The length of the inner cylinder is such a length that the flame protrudes from the tip of the inner cylinder, and at least at a position where the single-grain crushed stone enters the drum, the inner cylinder has a length that covers the periphery of the flame. The manufacturing method of the asphalt compound material of Claim 1 or 2 characterized by these.

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