JP4977539B2 - Asphalt pavement waste recycling dryer - Google Patents

Description

  The present invention relates to a dryer for regenerating asphalt pavement waste that heats and regenerates road pavement waste.

  Asphalt pavement waste material (hereinafter referred to as “waste material”) dug and raised by road construction and the like is heated and regenerated using an asphalt pavement waste material dryer. This regenerative dryer has a cylindrical drum that is rotatably and tiltably supported, and is brought into contact with hot air fed from a burner while scraping the waste material while scraping it up by a scraping blade provided in the drum, at a predetermined temperature. Waste materials are regenerated by heating up to.

  The problem when heating the waste material is that the asphalt component adhering to the surface of the waste material melts and becomes sticky, and adheres and accumulates on the drum inner wall and blades. In particular, the vicinity of the waste material input part of the drum is a temperature region where adhesion is most likely to occur, and a large amount of waste material adheres and accumulates in this region. In addition, since the fine-grained waste material contains a large amount of asphalt, in a factory that handles a large amount of fine-grained waste material, the waste material adhering to the vicinity of the input portion of the drum is intense and the adherence to the blades in the latter half of the drum also increases. If the adhered deposit lump is peeled off and mixed into the product, the quality of the product will be adversely affected.

Conventionally, as a measure for preventing waste material from adhering to the inner wall and blades of the drum, for example, a slackened chain is attached to a check blade disposed in the waste material input part of the drum, and the drum inner wall is impacted by the chain that rolls when the drum rotates. To prevent the attachment of waste materials, or to make the check blades made of a thin carbon tool steel plate with a thickness of about 1 to 2 mm, and to vibrate the check blades by the impact at the time of throwing in the waste materials. (Patent Document 1), and further, it is proposed that an electric heater is disposed on the outer peripheral wall of the waste material input portion of the drum and the drum wall is heated from the outside to prevent adhesion of the waste material (patent) Reference 2).
Japanese Patent Laid-Open No. 9-3815 Japanese Patent Laid-Open No. 9-25609

  However, although the above-mentioned conventional method has a certain adhesion preventing effect, it is inevitable that the waste material adheres and accumulates on the inner walls and blades of the drum, and there is a continuous demand for a means that can expect the adhesion preventing effect even a little. The current situation is.

  In view of the above points, an object of the present invention is to provide an asphalt pavement waste material regenerating dryer that can prevent the waste material from adhering and accumulating on the inner wall and blades of a drum by means different from conventional adhesion prevention means. .

  In order to solve the above-mentioned problems, the present inventors have conducted intensive research. As a result, waste materials in the waste material input side of the drum, particularly in the kiln action region (region where the waste material remains below the lifting by the blades) It is found that if the flow of water is partially blocked and retained, the phenomenon of scraping off the deposits by rubbing the inner wall surface and blades of the drum due to the layer thickness of the retained waste material results in very little adhesion of the waste material. Invented.

That is, the asphalt pavement waste recycling dryer according to claim 1 of the present invention is configured to put the asphalt pavement waste into a cylindrical drum that is rotatably supported so as to be in contact with hot air fed from a burner at a predetermined temperature. In the dryer for reclaiming asphalt pavement waste that heats up to a waste material, a part of the waste material flow is blocked on the inner wall of the waste material adhesion area on the waste material input side of the drum to form a layer thickness of a predetermined height in the waste material adhesion area It is characterized in that a damming body for retaining the waste is disposed, and the waste material that adheres to the inner wall surface of the drum in the waste material adhesion region is scraped off by the waste material that forms the layer thickness when the drum rotates .

  The asphalt pavement waste material recycling dryer according to claim 2 is characterized in that the damming body is disposed in a kiln action region of the drum.

  In the dryer for reclaiming asphalt pavement waste according to claim 3, the damming body has a ring shape along the inner peripheral wall of the drum, and gaps that do not block the flow of the waste material are arranged at predetermined intervals. It is characterized by.

According to the asphalt pavement waste material recycling dryer according to claim 1 of the present invention, a part of the waste material flow is dammed to the inner peripheral wall of the waste material adhesion region on the waste material input side of the drum, and a layer having a predetermined height is disposed in the waste material adhesion region. Since the damming body that retains the waste material is disposed so as to form a thickness, the inner wall surface and blades of the drum are rubbed due to the layer thickness of the retained waste material, and the waste material is scraped off. It is possible to prevent as much as possible deposits and deposits on the inner wall and blades of the drum. It was also found that the retention of the waste material causes the fine particles in the waste material to adhere and increase in size, and as a result, the amount of fine particles in the latter half of the drum is reduced and adhesion to the inner wall and blades in the latter half of the drum can be reduced. In the case of handling a large amount of fine-grained waste materials, the adhesion prevention effect is also great.

  According to the asphalt pavement waste material recycling dryer according to claim 2 of the present invention, since the damming body is disposed in the kiln action area of the drum, while the waste material stays almost without being lifted by the blades, it moves forward. The inner wall surface and blades of the drum are rubbed due to the thickness of the waste material that is moved and stays, and the waste material adhering material is scraped off, thereby preventing the waste material from adhering and accumulating on the inner wall and blades of the drum as much as possible.

  According to the asphalt pavement waste material recycling dryer according to claim 3, the damming body has a ring shape along the inner peripheral wall of the drum, and gaps that do not block the flow of the waste material are arranged at predetermined intervals. Therefore, a part of the waste material is dammed up by the ring-shaped damming body, the inner wall surface and blades of the drum are rubbed by the layer thickness of the remaining waste material, and the waste material adhering is scraped off and deposited on the inner wall and blades of the drum. Can be prevented as much as possible. In addition, when the waste material input into the drum is completed, the staying waste material gradually flows to the downstream of the drum from the gap of the ring-shaped damming body, and all the staying waste material is discharged and the waste material remains in the drum. There is nothing.

  In the asphalt pavement waste material recycling dryer according to the present invention, a damming body is disposed on the inner peripheral wall of the waste material adhesion region on the waste material input side of the drum so that the flow of the waste material is partially dammed and retained. The damming body is preferably disposed in a kiln action region, that is, a region where the waste material remains below the lift by the blade, for example, immediately after the check blade having no waste material lifting action in the drum input portion. .

  Further, the damming body has, for example, a ring shape along the inner peripheral wall of the drum, the height thereof is, for example, about 200 mm, and the ring-shaped damming body is appropriately divided to have, for example, about 200 mm to 300 mm. By adhering to the drum inner peripheral wall while appropriately providing a gap of a certain degree, the waste material staying at the end of charging the waste material does not flow from the gap downstream of the drum and the waste material does not remain in the drum.

  When waste material is put into the asphalt pavement waste material recycling dryer, the thrown waste material rolls down to the downstream of the drum, but part of the waste material is blocked by the ring-shaped damming body and stays there. Thus, a layer thickness of about 200 mm is formed. Then, as the drum rotates, the inner wall surface and blades of the drum are rubbed by the layer thickness of the waste material that stays, and the deposits are scraped off.

  In addition, when a large amount of fine waste material is used, it is increased by adhering fine particles by staying in the vicinity of the drum input part, and as a result, the amount of fine particles flowing down to the latter half of the drum is reduced. In addition, adhesion to the inner wall and blades of the rear half of the drum is reduced.

  In this way, the waste material adhering area of the drum input part, in particular, the damming body arranged on the inner peripheral wall of the kiln action area is used to stagnate part of the flow of waste material and retain it. Depending on the layer thickness, the inner wall surface and blades of the drum are rubbed to scrape off the waste material adhering material, and adhesion and deposition on the drum inner wall and blades can be prevented as much as possible. Further, by retaining the waste material, the amount of fine particles in the waste material is increased and adhesion to the inner wall and blades of the latter half of the drum can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  Reference numeral 1 in the figure denotes an asphalt pavement waste material recycling dryer that heats and recycles waste material, and a cylindrical drum 2 is rotatably supported by a support roller 4 on a machine base 3 and is driven by a drive device (not shown). It is rotating at a predetermined speed.

  5 is a burner for generating hot air. While forming a flame of the burner 5 in the combustion chamber 6, hot air is sent into the drum 2 from the hot hopper 7 side, and exhaust gas connected to the cold hopper 8 at the other end of the drum. While exhausting from the flue 9, waste material is supplied from the belt conveyor 10, and the waste material is heated to a predetermined temperature while rolling down in the drum 2.

  In addition, a plurality of check blades 11 are provided on the waste material input side in the drum 2 to prevent the input waste materials from spilling out from the drum end, while a scraping blade 12 that scoops up the waste material in front of the check blades 11. A plurality of are arranged. The check blade 11 moves the waste material forward without lifting it. The blade area is a kiln action area, while the scraping blade 12 lifts the waste material more than remains. This wing area is a flight action area. Even in the region where the scraping blades 12 are disposed, a kiln action region can be obtained by reducing the number of blades.

  Reference numeral 13 denotes a damming body disposed on the inner peripheral wall of the waste material adhesion region on the waste material input side of the drum 2, and partially dams and retains the flow of waste material supplied into the drum 2. The damming body 13 is preferably disposed in the kiln action region. In FIG. 1, the damming body 13 is disposed immediately after the check blade 11 which does not lift the waste material in the drum 2 charging portion. As shown in FIG. 2, the damming body 13 has a ring shape along the inner peripheral wall of the drum 2, and the ring-shaped damming body 13 is appropriately divided to form a gap 14 that does not block the flow of waste material. They are provided at predetermined intervals.

  The damming body 13 has a height of about 200 mm, for example, and gaps 14 of about 200 mm to 300 mm, for example, are formed at appropriate intervals so that the waste material does not remain after the waste material is charged.

  When the waste material is thrown into the asphalt pavement waste material recycling dryer 1, the waste material that has flowed flows downstream of the drum 2, but a part of the waste material is blocked by the damming body 13 and stays there. A layer thickness of high waste material is formed. The waste material of this layer thickness rubs the inner wall surface and blades of the drum 2 as the drum 2 rotates, scrapes off the waste material to be adhered, and prevents the adhesion of the waste material.

  In addition, if the waste material to be introduced contains a large amount of fine particle size, adhesion is likely to occur, but a phenomenon of increasing the particle size is caused such that the fine particle particles adhere to each other while being retained by the damming body 13, As a result, the amount of fine particles flowing down to the second half of the drum 2 is reduced, and waste material adhesion in the second half of the drum 2 is reduced.

  When the introduction of the waste material is finished, the waste material retained and retained by the damming body 13 gradually flows from the gap 14 between the damming bodies 13 to the downstream of the drum, and all the retained waste material is discharged. As a result, no waste material remains in the drum 2.

  In this way, when the waste material flow is blocked by the damming body 13 in the waste material adhesion region on the waste material input side of the drum 2, particularly the kiln action region, By scraping off the waste material to be attached by rubbing the inner wall surface and blades of the drum 2, it is possible to prevent adhesion growth on the inner wall and blades of the drum 2 as much as possible. Further, by retaining the waste material, the amount of fine particles in the waste material is increased, the amount of fine particles in the latter half of the drum 2 is reduced, and adhesion to the inner wall and blades of the latter half of the drum 2 can be reduced.

  In the above embodiment, the damming body 13 is formed in the ring shape and the gap 14 is formed. However, the damming body 13 is not limited to this, and the flow of the waste material in the waste material adhesion region of the drum 2 is partially dammed and retained. Of course, various modifications can be made without departing from the scope of the present invention.

It is a schematic block diagram which shows one Example of the dryer for asphalt pavement waste material reproduction | regeneration which concerns on this invention. It is a partially omitted AA line enlarged arrow view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dryer for asphalt pavement waste material reproduction 2 ... Drum 5 ... Burner 6 ... Combustion chamber 11 ... Check blade 12 ... Scrape blade 13 ... Damping body 14 ... Crevice

Claims (3)

In a dryer for recycling asphalt pavement waste material, the asphalt pavement waste material is placed in a cylindrical drum that is rotatably supported and heated to a predetermined temperature by contacting the waste material with hot air fed from a burner. dammed part flow waste in the inner peripheral wall of the waste material attachment region disposed a dam member is retained waste material to form a layer thickness of a predetermined height waste deposition area, the layer thickness at the time of drum rotation An asphalt pavement waste material regeneration dryer characterized in that the waste material adhered to the drum inner wall surface in the waste material adhesion region is scraped off by the waste material to be formed . The asphalt pavement waste material recycling dryer according to claim 1, wherein the damming body is disposed in a kiln action area of a drum. The asphalt pavement waste material according to claim 1 or 2, wherein the damming body has a ring shape along the inner peripheral wall of the drum, and gaps that do not dam the flow of the waste material are arranged at predetermined intervals. Recycling dryer.

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