JPH0355605Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for recycling asphalt pavement waste excavated by road construction and the like.

[Prior art] A lump of asphalt pavement waste material (hereinafter referred to as "waste material") excavated by road construction, etc. is mechanically crushed using a crusher, etc., to produce aggregate with an asphalt coating on the surface of the aggregate. As a granular material in particle units,
This is supplied to a dryer, which is a heating device, for heating and regeneration.

[Problem that the invention aims to solve] However, the waste wood contains a large amount of fine particles with an asphalt coating, and because these fine particles have a small heat capacity, they are heated too much in the dryer and the fine particles are destroyed. As the asphalt adhering to the dryer burns, due to its light weight, it gets caught up in the gas flow passing through the dryer and is carried away along with the exhaust gas, causing a pollution problem called blue smoke that cannot be ignored from the chimney. Exhaust smoke will be released.

[Means for solving the problem] The present invention was developed in view of the above-mentioned problems.In order to solve the above-mentioned problems, waste material is mixed and stirred with pre-heated coarse aggregate, and the mixture is heated by heat conduction. After softening the asphalt adhering to the waste material to increase its adhesion and adhesively bonding the waste material particles to each other, the particle size of the fine particles in particular is increased (hereinafter referred to as "enlargement") to increase the heat capacity, and then the dryer is used. It was designed to be supplied.

That is, in the present invention, a lattice-shaped cylindrical body having approximately the same diameter as the drum is connected to the vicinity of the lower opening of a cylindrical drum that is rotatably supported at an angle, and a burner and a A waste material input chute is provided, and a cold hopper surrounding the lower opening of the drum is provided with a circulating aggregate discharge port and a waste material discharge port located below the lattice-shaped cylinder.
A continuous mixer is disposed facing the circulating aggregate discharge port, a waste material input device is provided on the supply side of the continuous mixer, and a conveyance device that conveys waste material to a waste material input chute of a drum is provided on the discharge side of the continuous mixer. An object of the present invention is to provide an asphalt pavement waste recycling device characterized by the following.

[Function] According to the present invention, the waste material supplied to the continuous mixer is heated in a drum and mixed and stirred with the circulating coarse aggregate, thereby heating the asphalt content on the waste material. softens, increases stickiness,
As a result of adhesive bonding between the waste material particles, the fine particles of the waste material increase in size and the heat capacity increases. This waste material is fed into the drum together with the coarse aggregate via a conveying device, and as it tumbles down the drum, it is heated to a desired temperature by the hot air from the burner, and is heated to a desired temperature in the gaps between the lattice-like cylinders downstream of the drum. It passes through the waste material, is discharged from the waste material outlet, and is reused as recycled waste material. The coarse aggregate that has passed through the gaps between the lattice-shaped cylinders without passing through is discharged from the circulating aggregate discharge port and fed into the continuous mixer, where it is used again to heat the waste material.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Reference numeral 1 denotes a cylindrical drum having a large number of raking blades 2 arranged around it, which is rotatably tilted and supported by a support roller 4 on a machine base 3, and is driven by a drive device (not shown). The drum is rotated at a predetermined speed, and near the lower opening 5 of the drum, ring-shaped steel materials with approximately the same diameter as the drum are arranged side by side at appropriate intervals, and only waste materials with a particle size that can be reused are placed side by side. A lattice-like cylindrical body 6 is arranged in series so as to sieve the water. 7 is a burner disposed through a hot hopper 9 surrounding the upper opening 8 of the drum 1, which sends high-temperature gas into the drum 1 and is connected to a cold hopper 10 surrounding the lower opening 5 of the drum 1. The gas flow passing through the drum is maintained by suction with an exhaust fan installed at the end of the exhaust flue 11, and the gas is brought into contact with the waste material input from the waste material input chute 12, causing the waste material to roll inside the drum. The temperature is raised to the desired temperature while flowing down.

The cold hopper 10 includes a lattice-shaped cylindrical body 6.
A waste material discharge port 13 located below and a circulating aggregate discharge port 14 for discharging coarse aggregate that has passed through the lattice-shaped cylinder 6 without being sieved are provided.

15 is a continuous mixer disposed facing the circulating aggregate discharge port 14, into which waste material pulled out from a waste material storage hopper (not shown) is input via a waste material input device 16, and the circulating aggregate is discharged. It mixes and stirs the heated coarse aggregate introduced from the outlet 14. The waste material and coarse aggregate discharged from the mixer 15 are conveyed by a belt conveyor 17 and a bucket elevator 18, which are conveying devices, and are introduced into the drum 1 through a waste material inputting chute 12.

Therefore, if coarse aggregate larger than the lattice spacing of the lattice-shaped cylindrical body 6 is charged into the drum 1 in advance, the coarse aggregate heated in the drum 1 can be transferred to the continuous mixer 15.
The asphalt that adheres to the waste material is heated and softened while being mixed and stirred with the waste material in the waste material, increasing its adhesiveness and adhesively bonding the waste material particles to each other, increasing the fine particles and increasing the heat capacity. This granulated mixture of waste material and coarse aggregate is put into the drum 1, heated while rolling and flowing down the drum, and the waste material and coarse aggregate are sieved by a lattice-like cylindrical body 6 at the end of the drum. , waste material outlet 1
The heated waste material discharged from 3 is used as recycled waste material, and the coarse aggregate discharged from the circulating aggregate discharge port 14 is again fed into the continuous mixer 15 for circulation use.

[Effects of the invention] As described above, in the present invention, before the waste material is put into the drum, the asphalt content attached to the waste material is removed by mixing and stirring the waste material with the heated coarse aggregate in the drum. By heating and softening, the waste material, especially the fine particles, is adhesively bonded and granulated to increase the heat capacity.
The fine particles of waste material are not heated too much in the drum, and are less likely to be caught up in exhaust gas and scattered, making it possible to minimize the occurrence of blue smoke.

In addition, while coarse aggregate with a large particle size rolls down inside the drum, it collides with the inner peripheral wall of the drum, causing a shock.
It is possible to prevent waste materials from adhering to and growing on the inner peripheral wall of the drum as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical schematic side view of an embodiment of the present invention. 1... Drum, 6... Grid-like cylindrical body, 7... Burner, 9... Hot hopper, 10... Cold hopper, 12... Waste material input chute, 13... Waste material discharge port, 14... Circulating aggregate discharge port , 15... Continuous mixer, 16... Waste material input device, 17... Belt conveyor, 18... Bucket elevator.

Claims (1)

[Scope of utility model registration request] A lattice-shaped cylindrical body with approximately the same diameter as the drum is installed near the lower opening of a cylindrical drum that is rotatably supported at an angle, and a burner and a waste material input chute are installed in the hot hopper that surrounds the upper opening of the drum. The cold hopper that surrounds the lower opening of the drum is equipped with a circulating aggregate discharge port and a waste material discharge port located below the lattice-shaped cylinder, and is placed facing the circulating aggregate discharge port for continuous mixing. Asphalt pavement waste material recycling characterized in that a waste material input device is provided on the supply side of the continuous mixer, and a conveyance device for conveying the waste material to a waste material input chute of a drum is provided on the discharge side. Device.