JPH0218094Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Field of Application" The present invention relates to an asphalt mixture manufacturing device such as a drum mix plant.

"Conventional technology" Production of asphalt mixtures, such as drum mixers in drum mix plants that produce asphalt mixtures by injecting asphalt into dry and heated aggregates, and drum mixers in recycling plants that heat and recycle crushed asphalt pavement waste. In this device, high-temperature combustion gas is sent into a rotating drum together with aggregate or pavement waste, and the combustion gas dries and heats the aggregate or pavement waste.

``Problem to be solved by the invention'' However, when the combustion gas is exhausted from the rotating drum into the exhaust manifold provided at one end of the rotating drum, it collects dust containing sticky asphalt. Contains. For this reason, in conventional asphalt composite production equipment, this sticky dust adheres to the inner wall of the discharge manifold, accumulates and grows, is carbonized by the heat of the combustion gas, and peels off as carbide aggregates. There was a problem that the asphalt mixture fell and mixed into the asphalt mixture, impairing the quality of the asphalt mixture as a product.

This invention was made in view of the above circumstances,
It is an object of the present invention to provide an asphalt mixture manufacturing device that prevents dust particles peeled off from the inner wall of a discharge manifold from being mixed into the asphalt mixture, thereby maintaining good quality of the asphalt mixture. do.

"Means and actions for solving the problems" In order to achieve the above object, the present invention is provided with a screen that captures and removes dust aggregates that come off from the inner wall of the discharge manifold. The screen prevents dust particles from entering the asphalt mixture.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The drawing shows a drum mixer for a recycling plant, and numeral 1 in the drawing is a rotary drum that is rotated as indicated by R in the drawing about an axis by a drive device (not shown). The rotary drum 1 is inclined so that one end 1a is slightly higher than the other end 1b, and the one end 1a has a combustion chamber equipped with a waste material input box 2 and a burner 3. 4 are arranged in series, and a discharge manifold 5 is provided at the other end 1b. This discharge manifold 5 includes an exhaust port 5a on the upper side surface, and
The lower part is branched into two parts, left and right, with the left side (left side in Figure 2) serving as a recycled composite material outlet 5b, and the right side serving as a dust aggregate outlet 5c, Above the dust aggregate outlet 5c of the branching part, there is an inclined guide plate 6 for guiding the recycled asphalt composite material A discharged from the other end 1b side of the rotating drum 1 to the recycled composite material outlet 5b. It is provided. Further, in the upper part of the recycled composite material discharge port 5b of the branch part, there is a grizzly pipe that allows the recycled asphalt composite material A to pass through and captures the dust particles B that have fallen off from the inner wall of the discharge manifold 5. A state in which the screen 7 is inclined so as to be at a lower position toward the dust outlet 5c side, and forms a gap between it and the inclined guide plate 6 that is large enough to allow the dust aggregates B to pass through. The dust particles B captured by the grizzly screen 7 are disposed by the grizzly screen 7 under their own weight.
It is configured to slide down the top and be stored in the dust outlet 5c.

When asphalt pavement waste is recycled using the drum mixer configured as described above, first, the drive device (not shown) is operated to rotate the rotary drum 1 and the burner 3 is ignited. In addition, a blower (not shown) is operated to blow high-temperature combustion gas from the burner 3 from one end 1a of the rotating drum 1 to the other end 1b.
At the same time, it is discharged from the exhaust port 5a of the discharge manifold 5. In this state, crushed asphalt pavement waste material is introduced into the rotating drum 1 from the waste material input box 2. Then,
This crushed material is transferred from one end 1a of the rotating drum 1 to the other end 1a.
During the movement, it is dried and heated by the high-temperature combustion gas, recycled as asphalt mixture A, and discharged into the discharge manifold 5. Then, it passes through the grating of the grizzly screen 7 and is taken out from the recycled composite material outlet 5b.

In this way, asphalt pavement waste is recycled. During the recycling process, the high-temperature combustion gas from the burner 3 removes dust containing sticky asphalt before passing through the rotating drum 1. Includes When this combustion gas flows into the exhaust manifold 5, dust adheres to its inner wall. This adhered dust accumulates over time and is gradually carbonized by the heat of the combustion gas, and when it becomes aggregates B of a certain size, it peels off from the inner wall surface and falls. However, in the above drum mixer, the discharge manifold 5
Since a grizzly screen 7 is provided inside the grizzly screen 7, the fallen dust particles B are captured without passing through the grizzly screen 7, and slide down on the grizzly screen 7 due to their own weight and are stored in the dust particle outlet 5c. be done. The dust particles B accumulated in the dust aggregate outlet 5c are removed periodically by opening the dust aggregate outlet 5c. Therefore, there is no fear that the dust particles B will be mixed into the asphalt mixture A as a product, and the asphalt mixture A can maintain good quality.

In addition, in the drum mixer described above, the rotary drum 1 rotates as indicated by R in the figure, and when the asphalt mixture A falls into the discharge manifold 5, it tends to be biased toward the left side in Figure 2, but the reclaimed mixture discharge port 5b is provided on the left side, and the dust aggregate outlet 5c is provided on the right side, and a guide inclined plate 6 is provided above the dust aggregate outlet 5c to collect the asphalt mixture A that falls there. Since the asphalt mixture A is guided to the recycled mixture discharge port 5b side, there is little risk that the asphalt mixture A will be mixed into the removed dust particles B, which is convenient. Furthermore, since the Grizzly screen 7 is used, the asphalt mixture A and the dust aggregates B can be reliably separated and removed, and the structure is simple and durable.

By the way, in the above description, the drum mixer of a recycling plant has been described, but the present invention may be applied to a drum mixer of a drum mix plant, and the same effects can be obtained in that case as well.

"Effects of the Invention" As explained above, the asphalt mixture manufacturing apparatus of the present invention has a screen installed in the discharge manifold to catch and remove dust particles that come off from the inner wall of the discharge manifold, and with this screen, Since it is designed to prevent dust particles from being mixed into the asphalt mixture, it is possible to obtain an asphalt mixture of good quality, and the structure is simple and easy to implement. Further, since the inclined guide plate is provided on the dust aggregate outlet side of the lower branch of the discharge manifold, the dust aggregates can be efficiently captured.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view, and FIG. 2 is an enlarged sectional view taken along the - arrow in FIG. 1. 1... Rotating drum, 3... Burner, 5... Discharge manifold, 5b... Recycled material discharge port, 5c...
...Dust aggregate outlet, 6... Inclined guide plate, 7...
grizzly screen.

Claims (1)

[Scope of utility model registration request] Asphalt composite material production in which aggregate or crushed asphalt pavement waste material is put into a rotating drum, and asphalt is added as needed while drying and heating the aggregate or crushed asphalt pavement waste material with high-temperature combustion gas. In the device,
The lower part of the discharge manifold provided at the downstream terminal side of the rotating drum is branched into two parts, one being a recycled composite material discharge port and the other being a dust aggregate outlet. A screen is installed on the recycled composite material discharge side of the branching part to capture and remove dust particles that come off from the inner surface of the discharge manifold, while a screen is installed on the dust aggregate outlet side to collect and remove asphalt particles discharged from the rotating drum. An asphalt composite material manufacturing device characterized by being provided with an inclined guide plate that guides the material to a recycled composite material discharge port.