JPH0224962B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the production of regenerated heated bituminous mixture using bituminous pavement waste, and in particular, the invention relates to the production of regenerated and heated bituminous mixture using bituminous pavement waste material, and in particular, the invention relates to the production of regenerated and heated bituminous mixture using bituminous pavement waste material, and in particular, in a state where the mixture is not in contact with the flame of a burner and is far away from the recovery port. The present invention relates to a method and an apparatus for heating bituminous pavement waste by making it possible to freely drop the bituminous pavement waste.

[Conventional technology]

Conventionally, a heat exchange type heating device called a dryer in a batch type asphalt plant that heats new aggregate has a rotating cylindrical body tilted in the longitudinal direction and rotatably supported, and its lower opening is connected to a fixed base end. It is covered with a wall, and a burner is attached to the base end wall, and an aggregate recovery port is opened. The upper opening is covered by a fixed proximal wall, and the proximal wall is provided with a chute for introducing new aggregate and an exhaust duct for exhausting and removing dust from the cylindrical body.

A raking blade, a check blade, etc. are attached to the inner wall of this rotating cylindrical body. In such conventional heating devices, when the material to be heated is charged through the input chute and heated by the burner by rotating the rotating cylinder, the material to be heated is swept around the inner circumference of the cylinder by the scraping blades as the rotating cylinder rotates. The surface is scraped up from bottom to top, and as it falls repeatedly, it is heated, moves gently toward the collection port, and is heated and collected.

When producing a recycled heated bituminous mixture using bituminous pavement waste, if conventional facilities are used, new aggregate and bituminous pavement waste are introduced from the aggregate input chute on the upper proximal wall of the dryer, and then the burner is heated. As the bituminous pavement waste is directly heated by flame, the bitumen contained in the bituminous pavement waste is combusted, causing blue smoking and yellow smoking, which clogs the filter cloth of the dust collector located at the end of the exhaust duct. There were problems such as the bituminous material being carbonized and causing quality deterioration such as strength deterioration and embrittlement of the regenerated heated bituminous mixture.

Another conventional example is a continuous heating device. This is equipped with 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, and an intake section for asphalt pavement waste between the input section and the discharge port. In addition, a large number of flights are provided on the inner peripheral surface of the rotating drum, and a bale forming tool is provided inside the rotating drum between the input section and the intake section, and a new aggregate heated and mixed is provided. There is an asphalt mixture manufacturing device that is equipped with a spray pipe that injects and mixes liquid asphalt into waste materials (Japanese Patent Application Laid-Open No.
58-150603).

[Problem to be solved by the invention]

However, since the above-mentioned conventional manufacturing equipment is a continuous heating device, it is impossible to adjust the heating time of the waste material in accordance with operating conditions such as the temperature inside the rotating drum and the moisture content of the waste material. However, the particle size and composition of the discharged asphalt mixture were rough, making quality control difficult.

The present invention has been made in view of the above problems, and
The purpose is to adjust the heating time of waste materials according to operating conditions such as the temperature of the rotating cylinder and the water content of bituminous pavement waste, thereby increasing the mixing ratio of waste materials to new aggregate.

[Means to solve the problem]

In order to solve the above problems, the present invention has taken the following measures.

That is, while the inside of the rotating cylinder is heated with a burner from below the rotating cylinder that is tilted in the longitudinal direction, new aggregate is introduced from above the rotating cylinder and is heated and sequentially fed to the bottom of the rotating cylinder. , Further, unheated bituminous pavement waste is introduced from below the rotating cylinder into the flame of the burner in a non-contact manner and can be freely approached from or near the collection port, and while the bituminous pavement waste is being mixed in the rotating cylinder, the bituminous pavement waste is mixed. This method was used to heat bituminous pavement waste by indirectly heating it with the new aggregate and recovering it from below a rotating cylinder.

Further, the rotary cylindrical body is tilted in the longitudinal direction and supported on the support body so as to be rotatable in the circumferential direction, and the upper opening thereof is covered with a fixed wall body, and the upper part of the upper wall body is provided with new bone. In the heating device, an input chute for inputting materials is attached, the lower opening is covered with a fixed lower wall, and the lower wall is equipped with a collection port at the lower part and a burner at the center, An opening is formed in the upper part of the lower wall body, and a charging chute for charging bituminous pavement waste is installed, the tip of which is tilted downward into the rotating cylinder, and the bituminous pavement waste to be thrown is exposed to the flame of the burner. In addition to being installed in a non-contact state, the input chute for inputting the bituminous pavement waste is pivoted in a seesaw shape via a shaft in order to freely drop the bituminous pavement waste toward and near the collection port. This is a device for heating bituminous pavement waste material, which is equipped with an inclination angle adjusting means.

[Effect]

According to the present invention, the inclination angle of the inclination chute of the input chute, which is attached to the lower wall by forming an opening, is adjustable, so that the bituminous pavement waste can be placed in a non-contact state with the flame of the burner. Moreover, it can be dropped at any distance from the collection port. As a result, depending on the operating conditions such as the temperature inside the rotating cylinder or the water content of the bituminous pavement waste, if the waste is dropped far from the collection port, it will be transferred to the input chute for a long time and slowly, so it will quickly reach a high temperature. Moreover, if the aggregate is placed close to the recovery port, it will be transferred quickly and heated for a short time, and then it will be dropped onto the new aggregate that has been heated to a predetermined temperature. The bituminous pavement waste that has been dropped is mixed with new aggregate as the rotating cylinder rotates, and the waste is indirectly heated through heat exchange and can be recovered from the collection port, making it possible to heat the waste to the desired temperature. , therefore, the mixing ratio of waste material to new aggregate is
It has become possible to increase it to 60%.

〔Example〕

Embodiments of the present invention will be described based on the drawings. FIG. 1 is a side sectional view of the batch type heating device.

The rotating cylindrical body 2 of the heating device 1 has annular guides 2a, 2a fitted on the circumferential surface of both ends in the longitudinal direction, and the annular guides 2a, 2a are internally supported by annular supports 3, 3, and The annular guides 2a, 2a are installed on the support base 4 so as to be inclined in the direction, and the annular guides 2a, 2a are configured to slide and rotate along the inner surfaces of the annular supports 3, 3. Further, scraping blades 4a and 4b are attached to the inner surface of the rotating cylinder 2 at appropriate intervals along the inner circumferential surface and at appropriate intervals in the longitudinal direction, and non-returning blades are attached to the inner circumferential edge on the inclined upper side. Wings 4c are attached at appropriate intervals along the inner peripheral surface.

The rotation of the rotating cylindrical body 2 is driven by a drive mechanism of a normal heating device (not shown), for example, an annular gear is fitted onto the outer peripheral surface of the rotating cylindrical body 2, and a gear having a drive shaft is meshed with this annular gear. We are taking measures such as

The upper opening 2b of the rotating cylindrical body 2 is covered with an upper wall 5 fixed to the support base 4.
The upper wall body 5 has an annular wall 5b integrally attached to the periphery of the circular wall plate 5a, and the annular wall 5b is fitted onto the rotating cylindrical body 2. A suitable space is formed between the opposing surfaces to prevent rotation. sliding contact is prevented. Further, a charging chute 6 for charging new aggregate is attached to the wall plate 5a.

The lower opening 2c of the rotating cylindrical body 2 is covered with a lower wall 7 fixed to the support 4, and the lower wall 7 has an annular wall 7b attached to the peripheral edge of the circular wall plate 7a. The annular wall 7b is fitted onto the outer surface of the rotating cylindrical body 2, and an appropriate space is formed between the opposing surfaces to prevent sliding contact when the rotating cylindrical body rotates twice.

A recovery port 8 is formed at the lower end of the wall plate 7a, and a burner 9 is attached to the center of the wall plate 7a so that flame 9a can be radiated into the rotating cylindrical body 2.

Further, an opening 10 is formed in the upper part of the wall plate 7a, and a charging chute 11 for charging waste material is inserted and attached to the opening 10.

The input chute 11 for inputting the waste material has a lower part inside the rotating cylindrical body 2 and an upper part protruding outward.
The fixed part 11a is arranged at an inclination angle of 40 degrees, and the fixed part 11a is pivotally attached to the support body 7c attached to the outer edge of the opening 10, so that it can swing like a seesaw. It is constructed so that the inclination angle of the input chute 11 for inputting waste materials can be arbitrarily adjusted by interposing it between the lower part of the input chute 11 and the wall plate 7a.

According to the present invention having the above configuration, when new aggregate is charged from the new aggregate input chute 6, the rotating cylinder 2 is rotated, and the burner 9 is ignited, the scraping blades 4a and 4b are activated. The new aggregate is a rotating cylindrical body 2.
As it rotates, it is raked up, falls, and is stirred,
In the process, it flows in the direction of the recovery port 8 while being directly and indirectly heated by the flame 9a of the burner 9, and the temperature reaches 200℃.
It is also heated. Here, when the above-mentioned bituminous mixture pavement waste is input from the input chute 11 for inputting waste materials, it is stirred and mixed with the new aggregate heated to 200°C, and heated to 200°C by heat exchange. It can be collected from the collection port 8.

In this case, even if the moisture contained in the waste material turns into steam or dust flies up, it will move upward, so it must be removed from the gas vent 5c in the upper wall 5 or the input chute 6 for new aggregate. Can be done.

The angle adjusting means 12 is for adjusting the inclination angle of the input chute 11 for inputting waste materials by making the waste material dumping position farther or closer to the burner 9. If the inclination angle is made gentler, the waste materials can be thrown farther away. The waste material can be heated to a higher temperature faster if it can be dropped and the farther it is dropped.

The present invention is not limited to the above configuration.
For example, although the angle adjustment means 12 is attached to the lower part of the input chute 11 for inputting waste materials, it can be attached to the upper outside. The input chute 11 for inputting waste material is a single unit, but it can be divided into two pieces by integrally fixing the upper exterior to the lower wall 7 and swinging the lower interior. In that case, the support body 7c, the fixed part 11a, etc. will be located inside the circular wall plate 7a.

Further, a frame body is removably attached to the opening 10, an input chute for inputting waste materials is attached to the frame body in a swingable manner, and an input chute for inputting waste materials is detachably attached to the frame body. When the input chute for inputting waste material is not required, it can be removed and the opening can be closed to allow normal use as a heating device.

In addition, among the scraping blades 4a and 4b, the blade 4a closer to the burner 9 is formed to have a substantially L-shaped cross section, so that the flame 9a of the burner 9 is It will not be blocked by falling aggregate. The blade 4b on the side far from the burner 9 has a substantially L-shaped cross section, and its lower shelf is configured in the form of a perforated plate to scoop up aggregate, etc., and as it rotates, the blade 4b can be scooped up. As the process progresses, the aggregate will leak out from the perforated plate, increasing heating efficiency.

〔effect〕

Since the present invention is configured as described above, the new aggregate introduced into the rotating cylinder is heated, and the flame of the burner is adjusted according to the operating conditions such as the temperature inside the rotating cylinder or the moisture content of bituminous pavement waste. By dropping and mixing waste materials in a non-contact state and at any distance from the collection port, it is possible to adjust the heating time and indirectly heat the waste materials through heat exchange, which eliminates the need for conventional heating devices and heat exchange. In the exchange method, the mixture ratio of waste materials to new aggregates was no more than 45%, and 60
%, which has the effect of increasing the utilization of waste materials and reducing costs.

[Brief explanation of drawings]

The drawings relate to the present invention; FIG. 1 is a side sectional view of a batch type heating device, and FIG. 2 is a plan view of the heating device. 1... Warming device, 2... Rotating cylindrical body, 2a...
Annular guide, 2b...Upper opening, 2c...Lower opening, 3...Annular support, 4a, 4b...Rake blade, 4c...Check blade, 5...Upper wall, 5a...
...Circular wall plate, 5b...Ring wall, 5c...Gas vent,
6... New aggregate input chute, 7... Lower wall body, 7
a...Circular wall plate, 7b...Ring wall, 7c...Support, 8...Recovery port, 9...Burner, 9a...Flame, 10...Opening, 11...Input chute for inputting waste materials , 11a... fixed part, 12... angle adjustment means.

Claims (1)

[Scope of Claims] 1. While heating the inside of the rotating cylinder with a burner from below the rotating cylinder tilted in the longitudinal direction, new aggregate is introduced from above the rotating cylinder and the rotating cylinder is rotated. The heating is sequentially fed to the bottom of the cylindrical body, and unheated bituminous pavement waste is fed from below the rotating cylindrical body into the flame of the burner in a non-contact state and can be freely approached from or near the collection port, and mixed in the rotating cylindrical body. A method for heating bituminous pavement waste, characterized in that the bituminous pavement waste is indirectly heated by the new aggregate and recovered from below a rotating cylindrical body. 2. A rotary cylindrical body is tilted in the longitudinal direction and supported on a support body so as to be rotatable in the circumferential direction, and its upper opening is covered by a fixed upper wall body, and new bone is placed in the upper part of the upper wall body. In the heating device, an input chute for inputting materials is attached, the lower opening is covered with a fixed lower wall, and the lower wall is equipped with a collection port at the lower part and a burner at the center, An opening is formed in the upper part of the lower wall body, and a charging chute for charging bituminous pavement waste is installed, the tip of which is tilted downward into the rotating cylinder, and the bituminous pavement waste to be thrown is exposed to the flame of the burner. In addition to being installed in a non-contact state, the input chute for inputting the bituminous pavement waste is pivoted in a seesaw shape via a shaft in order to freely drop the bituminous pavement waste toward and near the collection port. 1. A heating device for bituminous pavement waste material, characterized in that it is equipped with an inclination angle adjusting means.