JPS6151083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing heated asphalt mixtures.

As a device for producing a heated asphalt mixture, it is generally known to have an aggregate input section at one end of a rotating drum equipped with a burner, and an aggregate discharge section at the other end. . This manufacturing device heats and mixes aggregate input from the input section and asphalt pavement waste (including combinations with similar asphalt aggregates) (hereinafter simply referred to as waste) in a rotating drum. A heated asphalt mixture (hereinafter simply referred to as asphalt mixture) is produced.

However, in the conventional manufacturing equipment as described above, since the waste material input section is provided near the burner of the rotating drum, there has been a problem that the waste material is strongly heated by the burner and is susceptible to thermal deterioration. .

Therefore, as shown in FIG.
In addition, an aggregate discharge section 4 is provided at the other end, and a radiant heat prevention plate 5 is installed inside the rotating drum 2 between the input section 3 and the discharge section 4, and the radiant heat prevention plate 5 and the discharge section 4 are connected to each other. Rotating drum 2 between section 4
An asphalt mixture manufacturing apparatus having a waste material intake section 6 around the periphery of the asphalt mixture has come into use.

However, in a manufacturing device configured in this way,
Since the space in the rotating drum 2 in which the aggregate moves becomes narrower around the radiant heat prevention plate 5, the passing wind speed in this area becomes faster, causing dusting and degrading the quality of the asphalt mixture produced. It was hot. In addition, in this manufacturing device, since the aggregate simply passes near the flame of the burner, the distance from the input section 3 to the radiant heat prevention plate 5 is set to be sufficiently long in order to sufficiently heat the aggregate. As a result, there is a problem that the rotating drum 2 becomes larger.

On the other hand, an input section 12 for aggregates and waste materials is provided at one end of the rotating drum 11 to which the burner 10 is attached, and an outlet section 13 for aggregates is provided at the other end. There is an asphalt mixture manufacturing apparatus in which a cylindrical body 14 having an outer diameter smaller than the inner diameter of a rotating drum 11 is attached as shown in FIG. In this manufacturing apparatus, the aggregate and waste material input from the input section 12 move along the outer circumferential surface of the cylindrical body 14, so that the waste material is not heated strongly by the burner 10.

However, in the manufacturing apparatus configured in this manner, the aggregate is not heated sufficiently because it does not receive the radiant heat of the flame of the burner 10, and there is a problem that the thermal efficiency of the entire apparatus is poor.

This invention has been proposed in consideration of the above-mentioned circumstances, and includes providing an aggregate input section at one end of the rotating drum to which a burner is attached, and an aggregate discharge port at the other end of the rotating drum. An intake section for asphalt pavement waste is provided between the input section and the discharge port, and the aggregate input from the input section is rotated together with the rotating drum and directed upward onto the inner peripheral surface of the rotating drum. While a large number of flights are provided to scrape up and fall, a large number of long pieces are arranged inside the rotating drum between the input section and the intake section with gaps slightly larger than the aggregate in the circumferential direction of the rotating drum. A cylindrical bale forming tool that receives the aggregate falling from the flight and disperses the aggregate in a film shape in a direction across the rotating drum is attached to the inner peripheral surface of the rotating drum and the flight. By forming and providing an aggregate passage between
To provide an asphalt mixture manufacturing device capable of manufacturing an asphalt mixture of stable quality by protecting waste materials from radiant heat of a burner flame and sufficiently heating aggregates.

The present invention will be explained below with reference to the drawings.

3 to 5 show an embodiment of the present invention, in which a cylindrical rotating drum 20 is mounted on support rollers 22, 22 provided on an inclined base 21 at one end (the left end in FIG. 3). ) 20a to the other end 2
It is supported in a state higher than 0b and rotated in the circumferential direction by a drive device 24 such as a motor via sprockets 23, 23.
Further, a burner 25 is attached to one end wall 20c of the rotating drum 20.

One end 20a of the rotating drum 20 is provided with an aggregate input part 26, and the other end 20b is provided with an aggregate discharge port 27. An intake portion 28 for waste material (including a similar combination of asphalt and aggregate) is provided in between.

The input section 26 includes one end 20 of the rotating drum 20.
A rotary bucket cart 30 communicating with the charging holes 29 formed in a large number on the peripheral wall of a, a charging hopper 31 surrounding the rotary bucket cart 30 and attached to one end 20a of the rotating drum 20, and a charging hopper 31 on the top of the charging hopper 31. It consists of an input port 32 formed as shown in FIG. And rotating drum 2
A large number of introduction blades 33 (only one is shown in FIG. 3) are provided on the inner circumferential surface of one end 20a of the 0. 20 toward the other end 20b side.

The discharge port 27 is located at the other end 20b of the rotating drum 20.
The other end 20b is formed by opening an exhaust manifold 35 having an exhaust hopper 34 at the bottom.
is connected to.

The intake section 28 also includes a rotary bucket 37 that communicates with intake holes 36 formed in large numbers in the circumferential direction of the inner circumferential surface 20d of the rotary drum 20 between the input section 26 and the discharge port 27, and G3
7 and an intake hopper 38 attached to the outer periphery of the rotating drum 20, and an intake port 39 formed in the upper part of the intake hopper 38 as shown in FIG.

In a portion of the inner circumferential surface 20d of the rotary drum 20 where the input hole 29 and the intake hole 36 are not provided, a raking flight 40 having a U-shaped cross section as shown in FIG. A large number of them (in FIG. 3, only the lower part of the inner circumferential surface 20d of the rotating drum 20 is shown) in the circumferential direction, with their concave surfaces aligned in the same direction,
It is installed as shown in FIG. In addition,
As is well known, the flight 40 only has the function of scooping up the aggregate and causing it to fall in a strip.

Furthermore, inside the rotating drum 20 between the input section 26 and the intake section 28, a large number of aggregates arranged in the circumferential direction of the rotary drum are arranged at intervals slightly larger than the particle diameter of the aggregate to be input from the input section 26. A cylindrical bale forming tool 42 consisting of a long member 41... is attached to the rotating drum 2.
Aggregates falling from the flights 40 which are provided to form an aggregate passage D between the inner circumferential surface 20d of 0 and the flights 40 and are supported by the supporting members 43, and which have scooped up the aggregate. As shown in FIG. 5, the particles can be dispersed in a veil-like (film-like) manner in the direction across the rotating drum.

On the other hand, on the other end 20b side of the rotating drum 20 is a spray pipe 4 for asphalt or other additive liquid.
4 are arranged.

Next, a case will be described in which an asphalt mixture is manufactured using the manufacturing apparatus configured as described above.

First, the rotary drum 20 is rotated in the direction shown by the arrow W in FIG. 5 by the drive device 24, and the burner 2
Light 5. At the same time, an exhaust system (not shown)
is driven to take in air through the exhaust manifold 35, and the high temperature combustion gas generated by the burner 25 is transferred from one end 20a of the rotating drum 20 to the other end 2.
Pass to 0b.

Then, aggregate is introduced into the rotating drum 20 from the input section 26. Then, the aggregate is transferred to the inner circumferential surface 2 of the rotating drum 20 by the flights 40 in the rotating drum 20.
0d and falls from the upper part of the inner circumferential surface 20d. During this fall, the aggregate is burner 25
It is heated by the high temperature combustion gas generated by the

In addition, during the above-mentioned falling, the aggregate that fell onto the bale forming tool 42 is dispersed through the gaps between the many elongated members 41 as shown in FIG. Fall evenly. At this time, the area of the aggregate that comes into contact with the combustion gas generated by the burner 25 is much larger than the area of the aggregate that comes into contact with the combustion gas in a conventional manufacturing apparatus that does not have the bale former 42. Therefore, the manufacturing apparatus of this embodiment has much better aggregate heating efficiency than conventional manufacturing apparatuses. Therefore, in the manufacturing apparatus of this embodiment, the length from the input part 26 to the intake part 28 of the rotary drum 20 can be set shorter than in the conventional manufacturing apparatus, and the rotary drum 20 can be made smaller.

Next, the heated aggregate sequentially moves toward the other end 20b of the rotating drum 20.

Next, the waste material is introduced into the rotating drum 20 from the intake section 28. Then, the waste material is mixed within the rotary drum 20 with the aggregate that has moved from one end 20a of the rotary drum 20, and is transferred to the other end 20b of the rotary drum 20 together with the aggregate. At this time, the waste material is heated by the combustion gas generated by the burner 25, but after the combustion gas sufficiently exchanges heat with the aggregate near the bale forming tool 42, its temperature decreases. Because of this, the waste materials do not deteriorate due to heat. Note that the radiant heat of the flame generated by the burner 25 is blocked by the aggregate falling within the bale forming tool 42, so that the radiant heat of the flame is not transmitted to the waste material. Therefore, thermal deterioration of the waste material is prevented.

Subsequently, liquid asphalt is sprayed and mixed into the heated and mixed aggregate and waste material using the spray pipe 44, thereby producing a heated asphalt mixture.

This heated asphalt mixture is then stored in the discharge hopper 34.

The cross-sectional shape of the flights 40 is not limited to the U-shape as in this embodiment, but may be any shape such as an L-shape or a U-shape, as long as it is capable of scraping up aggregates and bonded bodies.

FIG. 6 is an explanatory diagram depicting the temperature change of the combustion gas in the rotary drum 20 when an asphalt mixture is actually manufactured using the manufacturing apparatus of the present invention, in correspondence with a schematic diagram of the rotary drum 20. As is clear from FIG. 6, the temperature of the combustion gas drops rapidly near the bale forming tool 42 and reaches around 500° C. near the waste material intake section 28. Therefore, since the preferred temperature for heating waste materials without causing thermal deterioration is generally 550 to 500°C or less, the manufacturing apparatus of the present invention can heat the waste materials sufficiently without causing thermal deterioration. I can see that it is being done.

As explained above, the present invention provides a waste material intake section between the aggregate input port and the aggregate discharge port in a rotating drum having a burner, and provides flights on the inner circumferential surface of the rotary drum. A bale forming tool is installed inside the rotating drum between the input section, and the aggregate is transported above the bale forming tool by flight and falls in a bale shape across the rotating drum, and the high temperature combustion gas generated by the burner is sufficient. At the same time, the radiant heat of the burner flame is blocked by the aggregate dropped in a bale shape using a bale forming tool, which prevents thermal deterioration of the waste material and produces an asphalt mixture of stable quality. can be manufactured. In addition, since the aggregate can be efficiently heated by dropping the aggregate in a bale shape using a bale forming tool, the length from the input section to the intake section of the rotating drum can be set shorter than in conventional manufacturing equipment. There are effects such as being able to.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a conventional asphalt mixture manufacturing device, FIG. 2 is an explanatory diagram showing another example of the same manufacturing device, and FIG. 3 is an explanatory diagram showing an example of the asphalt mixture manufacturing device according to the present invention. A sectional view, FIG. 4 is a schematic plan view of the same embodiment, and FIG. 5 is a line taken along A-A in FIG.
FIG. 6, which is a schematic cross-sectional view taken along a line, is an explanatory diagram depicting the temperature change of the combustion gas in the rotating drum when an asphalt mixture is actually produced using the same example, in correspondence with the schematic diagram of the rotating drum. 20... Rotating drum, 20a... One end, 20b
...Other end, 25...Burner, 26...Input part, 2
7...Discharge port, 28...Intake part, 40...Flight, 41...Elongated member, 42...Bale forming tool.

Claims (1)

[Claims] 1. An aggregate input part is provided at one end of the rotating drum to which a burner is attached, and an aggregate discharge port is provided at the other end, and an asphalt pavement is provided between the input part and the discharge port of the rotating drum. A waste material intake section is provided, and a large number of flights are provided on the inner circumferential surface of the rotary drum to rotate together with the rotary drum, scrape up the aggregate input from the input section, and drop it. On the other hand, inside the rotating drum between the input section and the intake section, there are a number of elongated members arranged in the circumferential direction of the rotating drum with gaps slightly larger than the aggregate, and from the flight. A cylindrical bale former that receives falling aggregate and disperses the aggregate in a film-like manner in a direction across the rotating drum, is used to create an aggregate passageway between the inner circumferential surface of the rotating drum and the flight. An asphalt mixture manufacturing device characterized in that it is provided by forming an asphalt mixture.