JPS6346803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing asphalt composite material.

Asphalt concrete, which has traditionally been used for road paving, can be used for renovations etc.
Most of it was thrown away as waste. However, such disposal of asphalt waste not only causes economic loss but also causes waste material pollution.
Moreover, it takes a lot of time and money to transport the waste materials.
It is also unfavorable from the viewpoint of saving resources, which is a problem today.

Therefore, it is necessary to recycle the asphalt waste, but conventionally, this type of recycling treatment equipment uses high-frequency heating equipment, equipment that heats it by direct fire spray, or heating equipment that heats it by exposing it to a steam atmosphere. Some devices have been proposed, such as devices that indirectly heat the gas using high-temperature oil.

In view of these circumstances, it is an object of the present invention to provide an extremely practical apparatus for recycling asphalt waste.

In the present invention, a combination of water and steam is skillfully utilized to regenerate and utilize asphalt waste materials that were conventionally discarded, thereby increasing the treatment effect. That is, a major feature of the present invention is that steam is blown onto a solid block of asphalt waste material in water, thereby heating the solid block of asphalt waste material in water. Therefore, the steam blown through the holes in the steam pipe not only heats the water, but also directly hits the solid blocks of asphalt waste, thereby speeding up the softening and promoting the softening in a good manner. can.

In the present invention, a solid block of asphalt waste is submerged in water during heating. This point is one of the important points for the present invention. Adding steam injection pressure is also an important point, but the effect is only achieved by combining it with water.

According to the device of the present invention, since a sieving means such as a wire mesh is provided halfway inside the decomposition tank, large solid blocks of asphalt waste scraped from the paved road can be charged from the top of the decomposition tank. It is possible to omit crushing solid blocks of asphalt waste into small pieces in advance. Furthermore, even if large foreign objects such as cement concrete or stones are mixed into the asphalt waste, they can be stopped by the sieving means. Otherwise, the stone pipe is likely to damage the separation means. Furthermore, since there is a sieving means, the impact when the waste material falls is not directly applied to the steam pipe. Therefore, troubles during driving can be avoided. This is very important from a practical standpoint. Particularly when processing a large amount, it would be a huge loss in terms of time and cost if the waste must always be sorted and washed with water before recycling.

Since steam is injected into the water from a steam pipe below a sieving means such as a wire mesh, the solid block of asphalt waste is first heated and softened by the heat of the hot water and steam on the sieving means. As a result, the solid blocks, together with the weight of the waste material, gradually pass through the sieving means and fall. The solid block is subdivided step by step. The sieving means can also be multi-staged.

The asphalt waste materials charged from the top of the decomposition tank do not fall directly to the bottom of the decomposition tank, and at least those of large size are stopped by the sieving means. Therefore, the cold large solid blocks do not sink below the sieving means without being softened, making it easier to stabilize the temperature of the water in the area below the sieving means. In particular, since the steam is injected from the steam pipe below the sieving means, it is easy to control the temperature accurately.

In addition, fragmented recycled asphalt material tends to accumulate at the bottom of the decomposition tank. Therefore, if the regenerator is not operated on Sundays, for example, the asphalt will harden at the bottom of the decomposition tank. However, since steam is also injected to the separation means at the bottom of the decomposition tank, the hardened asphalt can be quickly softened, and the efficiency of the work can be improved. Additionally, mechanical breakdowns are less likely to occur.

Further, according to the present invention, since solid blocks of asphalt waste material that have become soft are separated, aggregates are less likely to adhere to the decomposition tank or other aggregates.

Further, since the asphalt content of the solid block of asphalt waste material is softened and separated, the aggregates are only separated from each other, and the aggregates themselves are not substantially destroyed. This is extremely important, especially from the viewpoint of the strength of asphalt concrete. As is well known, the shape of the aggregate plays an important role in achieving the desired strength of asphalt concrete. For this reason, asphalt waste recycling equipment that destroys aggregates is not practical if it is recycled multiple times in the future, if quality is important. In the present invention, the aggregate is simply separated while maintaining its original shape, which is satisfactory.

Asphalt waste is separated by heating it while submerged in water, which has a great separation effect.

In addition, since steam is blown into the water below the sieving means such as a wire mesh, the heating capacity is large, there is little waste in thermal efficiency, and the processing temperature, which affects quality, can be accurately and easily controlled.

The asphalt waste is allowed to sink into the water in the decomposition tank by its own weight, a sieving means is provided midway, and the waste is separated at the bottom of the decomposition tank, which reduces the mechanical burden.

Since the heating and separation processes are performed continuously in water, no pollution such as odor or dust is generated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the present invention will be clarified by explaining an example of an asphalt mixture production apparatus according to the present invention with reference to the drawings.

Inside the decomposition tank 4, a wire mesh 5 (an example of a sieving means), a steam pipe 3, and a crusher 6 are installed in order from the top. The steam pipe 3 in the decomposition tank 4 is provided with holes for steam injection. As shown in the figure, the steam pipe 3 is provided below the wire mesh 5. At the bottom of the decomposition tank 4, there is a screw 8 (an example of separation means).
is provided. A conveying device such as a hot elevator 9 is connected to the screw 8. A vibrating sieve 10 is installed at a position to receive the separated recycled asphalt material falling from the upper end of the hot elevator 9. A sorting pipe 11 is provided there.

A steam pipe 2 from the boiler 1 is connected not only to the interior of the decomposition tank 4 but also to a screw 8 and a hot elevator 9, respectively. A steam pipe 3 with a small hole is arranged inside them.

The decomposition tank 4 is filled with water up to the water surface level X.
The solid blocks 12 of asphalt waste are transferred to the decomposition tank 4.
When the solid block 12 of asphalt waste is introduced from the top of the water as shown in the figure, it sinks below the water surface, reaches the wire mesh 5, and is stopped at the wire mesh 5. The solid blocks 12 are then stacked on the wire mesh 5. On the other hand, heated steam is sent from the boiler 1 to steam pipes 2 and 3.

Steam is injected into the water in the decomposition tank 4 from the hole in the steam pipe 3, and at this time, the steam also hits the asphalt waste, increasing the thermal conductivity and improving the separation effect of the asphalt waste.

The solid block 12 of asphalt waste material heated and softened on the wire mesh 5 passes through the wire mesh 5 little by little and falls. Subsequently, the solid block 12 is separated by a crusher 6, and further subjected to a separating action while being conveyed by a screw 8 at the bottom of the decomposition tank 4. The entire surface of the recycled material thus separated is coated with asphalt, and is transported upward by a hot elevator 9 (conveying device) and sent to a vibrating sieve 10.

Note that the softened solid blocks 12 that have fallen from the sieving means such as the wire mesh 5 are separated by the crusher 6 and the screw 8 in the illustrated example.
It goes without saying that the crusher 6 may be omitted and other physical separation means may be employed.

Asphalt composite material is formed using the recycled material decomposed as the main raw material as described above, and can be recycled and used for current road pavement.

As described above, the present invention can sufficiently solve both problems of waste material pollution and resource conservation.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of an asphalt manufacturing apparatus according to the present invention. 1... Boiler, 2... Steam pipe, 3... Steam pipe, 4... Decomposition tank, 5... Wire mesh, 6... Crusher, 7... Water, 8... Screw, 9... Hot elevator, 10... Vibrating sieve, 11...
Sorting pipe, 12...Solid block of asphalt waste.

Claims (1)

[Claims] 1. A decomposition tank that contains water and allows solid blocks of asphalt waste to be submerged into the water from the top; a sieving means for temporarily stopping large solid blocks in the middle of the decomposition tank; A steam pipe for stacking solid blocks on a sieving means and injecting steam from below the sieving means to soften the solid blocks in water by the heat of the hot water and the direct heat of the steam; Separation means for finely separating the softened solid blocks at the bottom of the decomposition tank when they pass through the sieving means little by little and fall to the bottom of the decomposition tank; and a steam pipe for injecting steam to the separation means. An asphalt composite manufacturing device characterized by comprising: