JP5311622B2 - Manufacturing method and apparatus for asphalt mixture - Google Patents

Description

  The present invention relates to a method and an apparatus for producing an asphalt mixture, which is a road pavement material, using asphalt pavement waste and new aggregate.

  As a method of reclaiming asphalt pavement waste material (hereinafter referred to as “waste material”) excavated by road construction, etc., the crushed waste material is placed at room temperature on the side of the plant body with sieving, storage, weighing, and mixing functions. A waste material storage bin to be stored is installed, and a normal amount of waste material stored in the waste material storage bin is put into a mixer of the plant body, while being heated by a new material dryer to about 20 to 30 ° C. higher than usual. There is a method in which a new aggregate (hereinafter referred to as “new material”) is put into a mixer in a predetermined amount, mixed and regenerated while adding asphalt (see FIG. 1 of Patent Document 1).

  However, in the method of regenerating while raising the temperature of the normal temperature waste material by exchanging the temperature between the new heated material and the normal temperature waste material, the mixing ratio of the waste material to the new material is limited to about 30% or less, At present, waste materials are heated and mixed into new materials exclusively. In this waste material heating regeneration method, a regeneration dryer for heating the waste material is provided (see FIG. 1 of Patent Document 2), and the waste material is heated to a predetermined temperature by the regeneration dryer, thereby ensuring an appropriate temperature of the asphalt mixture. It is possible to increase the mixing rate of waste materials to 50% or more.

By the way, when the waste material is heated with a regenerative dryer, the asphalt component adhering to the waste material becomes sticky, and the waste material gradually adheres and remains on the scraping blades in the drum, and finally the scraping blades Function may be impaired. For this reason, a cord-like body with a movable member attached to the tip is attached to the inner peripheral surface of the drum, and when the drum rotates, the movable member is displaced to scrape the scraping blade to remove deposits on the surface of the scraping blade. (See Patent Document 3), curving the base of the plate-like scraping blade and attaching it to the inner peripheral surface of the drum, so that the waste material adheres to the connecting portion between the scraping blade and the drum so that the waste material flows smoothly (Refer to Patent Document 4) or install the scraping blade with a gap between the drum inner peripheral wall and prevent the waste material from adhering and holding at the connection point between the scraping blade and the drum inner peripheral wall ( Patent Document 5), various measures are taken to prevent the adhesion of waste materials.
JP 58-117102 A JP-A-2-272103 Utility Model Registration No. 2500587 Japanese Patent Laid-Open No. 11-131418 JP 2002-227118 A

  However, as described above, although various measures are taken to prevent the adhering of the waste material inside the drum of the regenerative dryer, there is a phenomenon that the waste material adheres and remains in the drum more or less, and there is always a demand for a method of reducing the adhesion as much as possible. Has been.

  An object of the present invention is to provide a method and an apparatus for manufacturing an asphalt mixture that minimizes the amount of waste materials adhering to the drum of a regenerated dryer.

  In order to solve the above-mentioned problems, the present inventor noticed that the waste fine particles containing a large amount of asphalt and having a small heat capacity tend to adhere, and the recycled dryer removed the fine particles of the waste. It was thought that if only the coarse particles were heated and regenerated, the amount of waste material adhering to the regenerated dryer would be reduced.

  That is, in the method for producing an asphalt mixture according to claim 1, a new material dryer for heating new materials, a regenerative dryer for heating waste materials, and a plant body having a sieving / storage / metering / mixing function. In a method for producing an asphalt mixture, a new material and waste material heated by both dryers are charged into a mixer of a plant body at a predetermined ratio and mixed while adding asphalt to produce a predetermined asphalt mixture. Coarse grain content with low asphalt content is supplied to the regenerative dryer and heated to the specified temperature, and then charged into the mixer. The fine content with high asphalt content is kept at room temperature without passing through the regenerated dryer. The asphalt mixture is produced by feeding a predetermined amount into the mixer.

  Moreover, in the manufacturing method of the asphalt mixture of Claim 2, the waste material coarse particle part heated with the said reproduction | regeneration dryer shall be a thing over 5 mm particle diameter, and it puts in a mixer at normal temperature without passing a reproduction | regeneration dryer. The waste material fine grain content is characterized by being under 5 mm particle diameter.

Moreover, in the asphalt mixture manufacturing apparatus according to claim 3, a new material dryer for heating the new material, a vibration sieve for receiving the new material heated by the new material dryer, an aggregate storage bottle, and an aggregate metering A plant having a tank and a mixer, and a regenerator for heating waste material, a waste material storage bin for storing waste material heated by the recycle dryer, a waste material metering tank, and a waste material discharged from the waste material metering tank. In the asphalt mixture manufacturing apparatus provided with a supply means to be put in, a normal temperature waste storage bin for storing the normal temperature waste material, a normal temperature waste material measuring tank for measuring the normal temperature waste material, and the normal temperature waste material measurement in the side of the plant body Rutotomoni a dosing means for introducing cold scrap to pay out from the tank into the mixer, the cold waste storage bins storing the fine grains with many asphalt content in waste It is characterized in that it has a structure for storing only waste fine fraction supplied cut from that waste hopper.

  According to the method for producing an asphalt mixture according to claim 1 of the present invention, coarse particles having a small asphalt content in the waste material are supplied to a regenerative dryer, heated to a predetermined temperature, and then charged into a mixer of the plant body. On the other hand, a fine granule with a high content of asphalt is put into a mixer at a normal temperature without passing through a regenerative dryer, and mixed while adding asphalt in the mixer to produce an asphalt mixture. In this case, only the coarse fraction of the waste material having a low asphalt content is heated, so that the waste material can be reduced as much as possible in the drum of the regenerated dryer. In addition, since the waste material mixed at room temperature when producing the asphalt mixture is limited to fine particles, the amount is not so large, and there is no problem even if it is mixed at room temperature.

Further, according to the asphalt mixture manufacturing method of claim 2, the waste material coarse particles to be heated by the regenerated dryer are over 5 mm in diameter, and the waste material is put into the mixer at normal temperature without passing through the regenerated dryer. since fine fraction is assumed to 5mm particle size under, wastes coarse fraction of 5mm particle size over supplies the reproduction dryer can minimize the waste adhering to the asphalt content of even less regeneration dryer drum.

Further, according to the asphalt mixture manufacturing apparatus of claim 3, a new material dryer for heating the new material, a vibration sieve for receiving the new material heated by the new material dryer, an aggregate storage bottle, and an aggregate measuring tank A regenerator that heats the waste material, a waste material storage bin that stores the waste material heated by the recycle dryer, a waste material measurement tank, and a waste material discharged from the waste material measurement tank in the mixer. In the asphalt mixture manufacturing apparatus provided with a supply means to be fed into the plant, a normal temperature waste storage bin for storing normal temperature waste material, a normal temperature waste material measurement tank for measuring normal temperature waste material, and the normal temperature waste material measurement tank in the side of the plant main body reservoir with the cold waste Ru and a dosing means for introducing into said mixer, said cold waste storage bin more fine grains of the asphalt content in waste material to be dispensed from the Waste fine fraction which is cut out from the waste hopper is supplied only because a structure for storing that, less coarse fraction asphalt content in the waste material is heated by supplying the reproduced dryer, busy asphalt content granules It is possible to produce an asphalt mixture by storing it at room temperature in a room temperature waste storage bin without passing through a regenerated dryer, and in the regenerated dryer, only the coarse particles of the waste material with a low asphalt content are heated to produce waste material in the drum. Adhesion can be minimized.

  In the asphalt mixture manufacturing apparatus of the present invention, a new material dryer that heats a new material, a vibration sieve that receives the new material heated by the new material dryer, an aggregate storage bin disposed below, and a bone A recycling dryer for heating the waste material, a waste material storage bin for storing the waste material heated by the regeneration dryer, a waste material measurement tank, and a waste material to be dispensed from the waste material measurement tank. In addition to a known configuration comprising a supply means for feeding into the mixer, a room temperature waste storage bin for storing room temperature waste material on the side of the plant body, a room temperature waste material measuring tank for measuring room temperature waste material, and the room temperature waste material measuring tank And a charging means for charging the normal temperature waste material discharged from the mixer into the mixer.

  In addition, the waste material hopper that cuts and supplies the waste material to the recycle dryer is stored in the waste material hopper while the coarse particles over 5 mm in the waste material are stored, and the waste material is cut and supplied to the room temperature waste material storage bin. A fine particle under 5 mm particle size is stored in the waste material hopper.

  And when manufacturing the asphalt mixture mixed with the waste material, the waste material fine particles are cut out from the waste material hopper storing the waste material fines, supplied to the room temperature waste material storage bin and stored, while the waste material coarse particles are stored. The waste material coarse particles are cut out from the stored waste material hopper, supplied to the recycle dryer, heated to a predetermined temperature and stored in a waste material storage bin. In addition, new material is supplied to a new material dryer and heated to a predetermined temperature, and the heated new material is supplied to the vibration sieve at the top of the plant body, sieved, and stored in an aggregate storage bin according to particle size. .

  When each material is stored in the aggregate storage bin, the waste storage bin, and the room temperature waste storage bin, the heated new material, the heating waste, and the room temperature waste from each storage bin according to the blending ratio of the asphalt mixture to be manufactured. Is metered into a mixer in the lower part of the plant body while measuring a predetermined amount and mixed while adding asphalt to produce a predetermined asphalt mixture.

  In this way, only coarse particles with low asphalt content in the waste material are supplied to the regenerated dryer and heated, and fine particles with high asphalt content are mixed in the asphalt mixture at normal temperature without passing through the regenerated dryer. Therefore, it is possible to minimize the waste material adhering to the drum of the regenerative dryer.

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

  FIG. 1 is a schematic configuration diagram of an asphalt mixture manufacturing apparatus according to the present invention, in which a new material dryer 1 for heating new materials, a regenerated dryer 2 for heating waste materials, and asphalt is added to and mixed with heated new materials and heated waste materials. In addition to the known configuration of the plant body 3 and the like, a room temperature waste material storage bin 4 for storing waste material fine particles having a high asphalt content at room temperature is disposed on the side of the plant body 3 so that the waste material fine particles at room temperature are disposed. Asphalt mixture can be manufactured by mixing with new heating materials and waste heating materials.

  The new material dryer 1 is configured such that a cylindrical drum 5 having a large number of scraping blades disposed on the inner periphery thereof is rotatably supported on a machine base 6 and rotated at a predetermined rotational speed by a driving device. The hot air is fed into the drum 5 from the burner 7 disposed at one end of the drum 5 and the combustion gas is sucked and exhausted by the exhaust fan 9 downstream of the exhaust duct 8 at the other end of the drum 5. The new material cut out from 10 is supplied into the drum 5 via the belt conveyor 11, heated to a predetermined temperature while the new material rolls down in the drum 5, and the heated new material is passed through the bucket elevator 12. The plant body 3 is supplied. In addition, a dust collector 13 is disposed downstream of the exhaust duct 8 so that the exhaust gas cleaned by capturing dust in the exhaust gas is discharged from the chimney 14 into the atmosphere.

  The regenerative dryer 2 has a structure similar to that of the new material dryer 1, and a cylindrical drum 15 having scraping blades arranged on the inner peripheral portion thereof is rotatably supported on the machine base 16, and one end portion of the drum 15 is provided. While the flame of the burner 17 disposed in the combustion chamber 18 is formed in the combustion chamber 18, hot air is sent into the drum 15 and combustion gas is sucked and exhausted by the exhaust fan 9 downstream of the exhaust duct 19 at the other end of the drum 15. Waste material cut out from the hopper 20 is supplied into the drum 15 via the belt conveyor 21 and the bucket elevator 22, and the waste material is heated to a predetermined temperature while rolling down in the drum 15. The heated waste material is temporarily stored in the waste material storage bin 23, and then a predetermined amount is measured in the waste material measuring tank 24 and supplied to the plant main body 3 side by an appropriate supply device 25 such as a conveyor.

  The plant body 3 includes a vibrating sieve 26 that screens the heated new material supplied from the new material dryer 1, an aggregate storage bin 27 that stores the screened heated new material according to particle size, and an aggregate that cumulatively measures the heated new material. A measuring tank 28, an asphalt measuring tank 29, a stone powder measuring tank (not shown), a mixer 30 and the like are provided.

  The room temperature waste material storage bin 4 accepts and temporarily stores the waste material cut out from the waste material hopper 31 and supplied via the belt conveyor 32 and the bucket elevator 33. The stored room temperature waste material is weighed in a predetermined amount in the lower temperature room temperature waste material measuring tank 34 and is put into the mixer 30 through a charging means such as a chute.

  Next, the case where the asphalt mixture which mixed the waste material in the said asphalt mixture manufacturing apparatus is manufactured is demonstrated. First, fine particles having a high asphalt content in the waste material, for example, waste materials having a particle size under about 5 mm, are stored in the waste material hopper 31, while coarse particles having a low asphalt content, for example, a waste material having a particle size in excess of about 5 mm are discarded. Stored in the hopper 20.

  When producing the asphalt mixture, the waste material fine particles are cut out from the waste material hopper 31 and supplied to the room temperature waste material storage bin 4 via the belt conveyor 32 and the bucket elevator 33 and stored. The coarse particles are cut out and supplied to the regenerative dryer 2 via the belt conveyor 21 and the bucket elevator 22, heated to a predetermined temperature with hot air from the burner 17, and stored in the waste material storage bin 23.

  Further, a new material is cut out from the aggregate hopper 10, supplied to the new material dryer 1 through the belt conveyor 11, brought into contact with hot air fed from the burner 7, heated to a predetermined temperature, and then plant body 3 through the bucket elevator 12. The sieve is supplied to the vibrating sieve 26 and sieved, and stored in the aggregate storage bin 27 for each particle size. Note that the new material may be heated to a temperature appropriately higher than usual depending on the amount of the normal temperature waste material mixed therein.

  Then, according to the blending ratio of the asphalt mixture to be manufactured, the heated new material in the aggregate storage bin 27 is accumulated in a predetermined amount in the aggregate measurement tank 28 and discharged into the mixer 30, and in the waste storage bin 23. A predetermined amount of waste material coarse particles are weighed in a waste material measuring tank 24 and charged into a mixer 30 by a supply device 25. Further, room temperature waste material fine particles in a room temperature waste material storage bin 4 are stored in a room temperature waste material measuring tank 34. A predetermined amount is weighed and put into the mixer 30, and asphalt weighed in a predetermined amount in the asphalt measuring tank 29 is added and mixed for a predetermined time to produce an asphalt mixture mixed with waste materials.

  In this way, not all of the waste material is supplied to the regenerated dryer 2 and heated and regenerated, but only the coarse particles having a small asphalt content in the waste material are supplied to the regenerated dryer 2 and heated to increase the asphalt content. Since the fine particles are mixed in the asphalt mixture at normal temperature without passing through the regenerated dryer 2, it is possible to minimize waste material adhesion in the drum 15 of the regenerated dryer 2. In addition, since the waste material mixed at room temperature when producing the asphalt mixture is limited to fine particles, the amount is not so large, and there is no problem even if it is mixed at room temperature.

  In the above-described embodiment, the waste material fine particles having an undersize of 5 mm in the waste material are mixed into the asphalt mixture at room temperature. Needless to say, the waste fine particles may be mixed in the asphalt mixture at room temperature, and the like can be appropriately changed within the scope not departing from the gist of the present invention.

It is a schematic block diagram which shows one Example of the manufacturing apparatus of the asphalt mixture which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... New material dryer 2 ... Recycled dryer 3 ... Plant body 4 ... Room temperature waste storage bin 34 ... Room temperature waste material measuring tank

Claims (3)

  A new material dryer that heats new materials, a regenerative dryer that heats waste materials, and a plant body that has a function of sieving, storage, weighing, and mixing. In a method for producing an asphalt mixture in which a predetermined amount of asphalt mixture is produced by introducing the mixture into a mixer at a predetermined ratio and mixing while adding asphalt, coarse particles having a low asphalt content in the waste material are supplied to a recycle dryer. After heating to a predetermined temperature, a predetermined amount is charged into the mixer, and a small amount of fine particles with a high asphalt content is charged into the mixer at normal temperature without passing through a regenerative dryer to produce an asphalt mixture. To produce an asphalt mixture.   The waste material coarse particles heated by the regeneration dryer are over 5 mm in particle size, and the waste material fine particles charged into the mixer at room temperature without passing through the regeneration dryer are under 5 mm particle size. The method for producing an asphalt mixture according to claim 1. A new material dryer that heats the new material, a vibration sieve that accepts the new material heated by the new material dryer, an aggregate storage bin, an aggregate metering tank, and a plant body that consists of a mixer, and a regeneration that heats the waste material In an asphalt mixture manufacturing apparatus comprising: a dryer; and a waste material storage bin for storing waste material heated by the regenerated dryer, a waste material measurement tank, and a supply unit that inputs waste material discharged from the waste material measurement tank into the mixer. A normal temperature waste storage bin for storing normal temperature waste material, a normal temperature waste material measuring tank for measuring normal temperature waste material, and a charging means for supplying the normal temperature waste material discharged from the normal temperature waste material measurement tank into the mixer are disposed on the side of the plant main body. comprising Rutotomoni, the cold waste storage bins to store only waste fine fraction supplied cut from waste hopper for storing fine fraction busy asphalt content in waste Apparatus for producing asphalt mixture, characterized in that the configuration and the.

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