JPH0745607Y2 - Asphalt pavement waste material recycling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an asphalt pavement waste material recycling apparatus for heating and recycling the asphalt pavement waste material dug up by road construction or the like.

[Prior Art] A lump of asphalt pavement waste material (hereinafter referred to as "waste material") dug up by road construction and the like is mechanically crushed by a crusher or the like, and a granular material in units of aggregate particles having an asphalt coating on the surface of the aggregate. Then, this is supplied to a dryer that is a heating device to perform heating regeneration.

Then, the waste material contains a large amount of fine particles having an asphalt film, and since these fine particles have a small heat capacity, they are overheated in the dryer and the asphalt content adhering to the fine particles burns. At the same time, because of its light weight, it is entrained in the gas flow passing through the dryer and carried away along with the exhaust gas, and emits smoke, called blue smoke, which cannot be ignored in terms of pollution from the chimney.

In addition, waste material has stickiness due to heating and is easy to adhere to it. In particular, its fine particles (waste material of 0.6 mm or less) are light weight, so even if they adhere, they do not peel off and accumulate on the scraping blades of the dryer. It reduces the lifting capacity and reduces the drying capacity of the dryer.

Therefore, the waste material is preheated to adhesively bond the waste material particles together, and in particular, the particle size of the fine particles is increased (hereinafter referred to as “increased particle size”) to increase the heat capacity, thereby suppressing the occurrence of blue smoke or the inside of the drum. Since it can be expected to prevent the adherence to the aggregate as much as possible, the applicant of the present invention, as shown in Japanese Utility Model Application Laid-Open No. 64-37507, heats the coarse aggregate with a dryer and removes the coarse aggregate discharged together with the waste material with a grizzly feeder. It has been proposed that the separated heated coarse aggregate is mixed with the waste material before heat regeneration to increase the size of the waste material and supply it to the dryer.

[Problems to be solved by the invention] However, when a grizzly feeder is used for separating the heating waste material and the coarse aggregate, the coarse aggregate may be clogged in the mesh of the grizzly feeder or the waste material may be accumulated. It has a drawback that maintenance such as removing is troublesome. Also, if the coarse aggregate for heating is not taken out from the dryer or the continuous mixer at the end of shipping, it will stick to each other due to the asphalt adhering to form a lump, which will hinder the restart of operation. The removal work is also troublesome.

In view of the above points, the present invention has an object to provide an asphalt pavement waste material recycling apparatus that facilitates maintenance work when increasing the size of waste materials.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a hot hopper at the upper opening of a cylindrical drum rotatably supported in a tilted manner.
A cold hopper is installed in the lower opening, a waste material input device is installed in the hot hopper, a waste material discharge port is installed in the lower part of the cold hopper, and a waste material extraction device for extracting a part of the heat waste material in the vicinity of the waste material discharge port. The continuous mixer is arranged downstream of the waste material extracting device, the supply side of the continuous mixer is faced with the input portion of the waste material supply device for supplying the waste material to the drum, and the discharge side is arranged on the discharge side. The waste material feeding device is provided with a transport device for transporting the waste material.

[Operation] According to the asphalt pavement waste material recycling apparatus according to the present invention,
The waste material to be regenerated is passed through a continuous mixer and then supplied to a dryer which is a heating and drying device. A part of the heated aggregate heated by the dryer is extracted by the waste material extracting device and supplied to the continuous mixer. As a result, the heating waste material and the waste material before being heated are mixed in the continuous mixer, and the fine particles of the waste material adhere to the surface of the heating waste material having adhesiveness to increase the particle size. By this particle size increase, the waste material with a reduced fine particle content is supplied to the dryer. As a result, the generation of blue smoke in the dryer can be minimized, and the amount of waste material deposited inside the dryer can be minimized.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a dryer for heating and recycling waste material, in which a cylindrical drum 2 is rotatably supported by a support roller 4 on a machine base 3 and is rotated at a predetermined speed by a drive device (not shown). . Reference numeral 5 denotes a hot hopper provided in an upper opening of the drum 2, and a hot combustion chamber 7 for forming a flame generated by a burner 6 and sending hot air into the drum 2 is provided in the hot hopper 5. Then, the hot air generated by the burner 6 is sent into the drum 2, and the exhaust gas is sucked by the exhaust fan (not shown) provided at the end of the exhaust flue 9 connected to the cold hopper 8 provided on the lower side of the drum 2. To maintain the gas flow passing through the drum 2. A large number of scooping blades 10 are provided around the inner peripheral wall of the drum 2, and a non-return blade 11 is provided on the side of the hot hopper 5 of the drum 2 so that the waste material introduced advances toward the inner side of the drum 2. Is provided. Reference numeral 12 denotes a belt conveyor which is a waste material charging device for charging the waste material into the drum 2.
The input tip end of 12 is exposed to the upper opening of the drum 2 so that the angle can be adjusted to adjust the dropping position of the waste material in the drum 2. The waste material thrown into the drum 2 by the belt conveyor 12 comes into contact with the hot air passing through the drum 2 while rolling down in the drum 2, and is heated to a desired temperature and heated to a lower portion of the cold hopper 8. It is discharged from the disposed waste material discharge port 13. A screw conveyor 14, which is a waste material extracting device for extracting a part of the heating waste material, is disposed near the waste material discharge port 13. A continuous mixer 16 is disposed below the discharge port 15 downstream of the screw conveyor 14. On the supply side of this continuous mixer 16, the input part of a belt conveyor 17 which is a waste material supply device is faced, and before the waste material taken out from the waste material storage hopper (not shown) is introduced into the dryer 1, it is a continuous type. It is arranged to be charged into the mixer 16. On the discharge side of the continuous mixer 16, a belt conveyor 18 and a bucket elevator (which may be a belt conveyor) 19 which are conveying devices for conveying the discharged waste material to the belt conveyor 12 are arranged.

Then, the waste material taken out from the waste material storage hopper (not shown) is supplied to the continuous mixer 16 via the belt conveyor 17, passes through the mixer while being mixed and stirred, and then the belt conveyor 18 and the bucket elevator 19 Then, the belt conveyor 12 is transferred one after another and is loaded into the drum 2. Then, the waste material put into the drum 2 is heated to a predetermined temperature by the hot air sent by the burner 6 while rolling down in the drum, and is discharged from the waste material discharge port 13. At this time, a part of the heating waste material discharged from the waste material discharge port 13 is extracted by the screw conveyor 14 which is a waste material extracting device and is supplied to the continuous mixer 16. As a result, the heating waste material and the waste material before being heated are mixed in the continuous mixer 16, and the fine particles of waste material adhere to the surface of the heating waste material that has been heated and becomes sticky to increase. Grain. Due to this particle size increase, the waste material, which has a small amount of fine particles, is supplied to the drum 2. Therefore, since the fine particles of the waste material to be put into the drum 2 are increased in particle size to increase the heat capacity, they are not overheated in the drum, the amount of asphalt is less burned, and the occurrence of blue smoke can be prevented as much as possible. is there. In addition, since the fine particles of waste material are increased in size and become heavy, even if they adhere to the inside of the drum, for example, the weight exceeds the adhesive force and it is easy to peel off, and the amount of waste material attached to the inside of the drum also decreases. is there.

Although the screw conveyor is used as the waste material extracting device in the embodiments, the invention is not limited to this, and for example, a branch chute may be provided to extract a part of the heated waste material.

[Advantage of the Invention] As described above, according to the asphalt pavement waste material recycling apparatus according to the present invention, the waste material fine particles are mixed and stirred with a part of the heat waste material before the waste material is put into the drum, and the waste material fine particles are transferred to the surface of the heat waste material. Since the particles are attached to increase the heat capacity and increase the heat capacity, the waste fine particles are not overheated in the drum, and the generation of blue smoke can be minimized.

Further, the fine particles of the waste material are increased in particle size and become heavy in weight, and even if they are attached, they are easily peeled off, so that the attachment to the inner peripheral wall of the drum, the scraping blade, etc. can be minimized.

In addition, it is possible to reduce the troublesome maintenance that accompanies the use of the grizzly feeder as in the conventional case, and it is possible to eliminate the troublesome work of taking out the coarse aggregate at the end of shipping.

[Brief description of drawings]

FIG. 1 is a partially longitudinal schematic side view showing an embodiment of an asphalt pavement waste material recycling apparatus according to the present invention. 1 ... dryer, 2 ... drum, 5 ... hot hopper,
8 …… Cold hopper, 12 …… Belt conveyor (waste material input device), 13 …… Waste material discharge port, 14 …… Screw conveyor (waste material removal device), 16 …… Continuous mixer, 17 ……
Belt conveyor, (waste material supply device), 18 ... Belt conveyor (transport device), 19 ... Bucket elevator (transport device)

Claims (1)

[Scope of utility model registration request] A hot hopper is provided in an upper opening of a cylindrical drum rotatably supported in an inclined manner, and a cold hopper is provided in a lower opening thereof. A waste material feeding device is provided in the hot hopper, and a waste material is provided at a lower portion of the cold hopper. A discharge port is installed, a waste material extracting device for extracting a part of the heated waste material is installed near the waste material discharging port, a continuous mixer is installed downstream of the waste material extracting device, and a continuous mixer is supplied. An asphalt pavement waste material recycling apparatus, characterized in that a charging section of a waste material supplying apparatus for supplying the waste material to the drum is faced on the side, and a conveying apparatus for transferring the waste material to the waste material charging apparatus is disposed on the discharge side.