JPH0140167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recycled asphalt mixture manufacturing apparatus for manufacturing recycled asphalt mixture by recycling asphalt waste.

BACKGROUND ART Various devices have been devised to reuse asphalt waste material from road replacement and the like. However, with conventional asphalt recycling equipment, large pavement waste materials that have just been excavated must be preliminarily sorted and preliminarily separated into predetermined sizes, which takes a lot of time and effort to produce the final recycled asphalt mixture. It was necessary. Moreover, heating costs were extremely high, making it extremely uneconomical.

The present invention was made in view of the above-mentioned circumstances, and provides a recycled asphalt mixture manufacturing device that effectively utilizes waste heat, eliminates heating costs, and that can automatically regenerate various construction waste materials. The purpose is to provide

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. For convenience, the names used in the manufacturing process of asphalt waste are defined as follows.

Asphalt waste material is separated by applying heat (hot air, boiling water, etc.) to produce asphalt recycled material, asphalt recycled material is a mixture of asphalt recycled material of various sizes and unused aggregate, and asphalt recycled mixture is produced.
A recycled asphalt mixture is obtained by adding asphalt and other additives to the asphalt recycled mixture and kneading the mixture.

FIG. 1 is a schematic diagram of a recycled asphalt mixture manufacturing apparatus according to the present invention.

The asphalt waste material is softened by heat in the horizontal asphalt waste processing device 70 and then separated, thereby becoming an asphalt recycled material. Asphalt waste processing equipment 70 includes pavement waste processing equipment 1 (see Figure 3) and asphalt recycling equipment 2.
3 (see FIG. 4), which will be described later.

Thereafter, the asphalt recycled material is heated and dried while being mixed with unused aggregate in a drum mixer 19 to form an asphalt recycled mixture. Then, asphalt and other additives (for example, stone powder, oils, etc.) are added before, during or after the process to produce a recycled asphalt mixture.

At this time, the waste heat of the drum mixer 19 passes through the waste heat transfer device 71 and passes through the asphalt waste material processing device 7.
It is recovered to 0. For example, it is supplied into the conveyance path 5 (see FIG. 3) of the pavement waste treatment device 1 or into the heating cylinder 42 (see FIG. 4) of the asphalt regeneration device 23 for reuse.

FIGS. 2A and 2B are plan views showing an example of an apparatus for producing recycled asphalt composite material according to the present invention.

First, explanation will be given with reference to FIG. 2B.

Paving waste material (usually including asphalt waste material, cement concrete waste material, etc.) carried out from the truck 2 is dropped onto a sieve 56. The pavement waste material is the same material that has been excavated. Flui 5
6 is arranged in an inclined manner, and the pavement waste material slides down toward the transfer device 58 due to its own weight or vibration.

A conveyor 3 is arranged below the sieve 56. One end of the conveyor 3 reaches a sieve 4.
Most of the waste other than asphalt waste and concrete cement waste has a particle size of 50 mm or less, and is sorted by the aforementioned sieve 56, falls downward, and is transferred to sieve 4 by a conveyor 3 such as a bucket type or feeder type. transported. The particles are then further divided by particle size and stored in stockyards 33, 34, 35 and 36. These small particle size contaminants are mainly recycled as roadbed material either as they are or after adding additives such as cement and water.

Following the sieve 56, a pavement waste material conveyance path 5 is provided. The pavement waste is put into a transfer device 58 and transported on the pavement waste transport path 5 to the pavement waste processing device 1. A roof (not shown) (preferably equipped with a solar water heater or a transparent glass plate) is installed on the sieve 56 and the pavement waste material conveyance path 5 to prevent heat radiation, and a water sprinkler (not shown) is installed to remove dust. It is preferable to prevent In addition, the transfer device 5
It is preferable to construct the container 8 so that it enters the water tank during transportation, since paper, wood chips, etc. can be removed.

FIG. 3 is a sectional view showing an example of the pavement waste treatment apparatus 1 used in the present invention.

Inside the pavement waste treatment device 1, a water sprinkler device, for example, a pipe 59 with many holes, is arranged slightly above the moving space of the transfer device 58. pipe 5
Hot water gushes out from the small hole 9 and pours into the paving waste material in the transfer device 58. Drainage water is sent to a water tank 55 via drain pipes 53 (see Figure 2B) and 54. In addition, the preliminary hot air supply device 40
(See FIG. 2B), the inside of the pavement waste treatment apparatus 1 is always preheated. Preliminary hot air supply device 4
0 may be provided at a location other than that shown.

Other types of pavement waste treatment device 1 may also be adopted. For example, a conveyor system, a caterpillar system, or a system in which a series of boxes are continuously moved can be used.

At the end of the pavement conveyance path 5, a device, for example a hoist 60 (see FIG. 3), for discharging the heated asphalt waste material from the transfer device 58 is provided. The transfer device 58 is overturned by a hoist 60, whereby the asphalt waste material inside the transfer device 58 is discharged to the outside of the transfer device 58. A sorting device, for example a vibrating sieve 61, is arranged at the discharge location.

Since the pavement waste material arriving at the vibrating sieve 61 has already been sufficiently heated within the conveyance path 5, the asphalt waste material is softened. Therefore, when passed through the vibrating sieve 61, the asphalt waste material falls as recycled asphalt material in which each aggregate is in a disjointed state. At this time, the particle size of the recycled asphalt material is approximately 120 mm or less. And most of the oversized ones are cement concrete waste materials and large stones. They are introduced into the crusher 21 (see Figure 2B), where they are finely divided into predetermined sizes and then stored in the stockyard 3.
7, 38 and 39.

In this way, concrete waste is removed from asphalt waste.

Note that it is also possible to use a vibrating sieve instead of the crusher 21 and to transport large-sized waste materials to the sieve 4 using a lift (not shown).
Further, the crusher 21 may be omitted in some cases.

The hot air that heated the inside of the pavement waste treatment device 1 is sent to the hopper 11 (described later) by the waste heat transfer device 65, and can be reused.

The asphalt recycled material that has passed through the vibrating sieve 61 is conveyed to the asphalt regenerating device 23 via the conveyor 22. Here, the recycled asphalt material is further finely divided.

FIG. 4 is a schematic diagram showing an example of an asphalt regeneration device 23 used in the present invention.

The recycled asphalt material is put into a heating cylinder 42 which is rotated by a motor 43. The heating cylinder 42 rotates at a predetermined rotational speed. The recycled asphalt material is supplied to the inlet 42a of the heating cylinder 42 via the supply device 44. At the same time, hot water is supplied from the tip 45a of the hot water supply pipe 45 to the inlet 42a of the heating cylinder 42. The supplied hot water gradually overflows from the weir 42d and flows toward the outlet 42b. At the same time, the recycled asphalt material is removed from the hot water by the blade 4.
2c, and when it reaches the upper part of the inner wall of the heating cylinder 42, it falls and enters the hot water again until it is separated into small pieces and the outlet 42
It moves towards b.

As shown in FIG. 2B, the asphalt regeneration device 23 includes a drum mixer 19 and a waste heat transfer device 64.
(see FIG. 2B), waste heat (heated exhaust gas) from the drum mixer 19 is sent to the asphalt regeneration device 23 and reused for heating within the asphalt regeneration device 23. The waste heat transfer device 64 is provided with an exhaust fan 62 and a chimney 63.

The waste heat from the drum mixer 19 is also reused in the pavement waste treatment device 1.

Hot air 10 from the preliminary hot air supply device 40 and the waste heat transfer device 64 is blown into the outlet 42b of the heating cylinder 42. The recycled asphalt material (each aggregate has an asphalt coating attached to its surface) falls onto the conveyor 6, is conveyed as it is in the direction of arrow X, and reaches the crusher 7 (see FIG. 2B). The hot water flowing out from the outlet 42b of the heating cylinder 42 is
The water enters the water reservoir 41 and is sent to the water tank 55 through drain pipes 52 and 54 (see Figure 2B).

Alternatively, the water in the water tank 55 may be transported to the vicinity of the waste heat transfer device 64 via a pipe 66, heated using the heated exhaust air of the drum mixer 19, and sent to the asphalt regeneration device 23 or the pavement waste treatment device 1. It is possible.

Referring again to FIG. 2B, the asphalt recycled material conveyed to the crusher 7 has a particle size of approximately
It is separated into pieces of 25 mm or less and transported to a sieve 9 by a conveyor 8. A water receiver (not shown) is provided below this sieve 9 to catch water droplets falling from the recycled asphalt material. Further, it is desirable to blow hot air onto the recycled asphalt material from above, from the left and right, and/or from below.

In the sieve 9, the asphalt recycled material is sieved according to particle size and sent to the elevators 46, 47, 4.
8, 49 and 50 to the hopper 11. It is preferable that the hopper 11 is provided with a spare hopper in addition to those shown in the figure, and that the spare hopper is used when the hopper of a predetermined size is full. Further, in the hopper 11, asphalt recycled material is stored in a heated state according to particle size. As for the hopper 11, for example, it is preferable that the hopper 11 is provided with a roof to prevent heat radiation. An indirect heating hopper can be used.

5 and 6 are diagrams showing an example of an indirect heating hopper 11' used in the present invention.

The indirect heating hopper 11' is divided into several hoppers 20 as a whole. elevator 46,
The recycled asphalt material carried into the hoppers 47, 48, 49, and 50 is put into a required hopper 20 according to its particle size, and sequentially taken out from the take-out port 24 at the lower end.

The recycled asphalt material charged into the hopper 20 is heated by a heating device 16 provided within the hopper 20. The heating device 16 is formed by fixing a flexible tube 25 to a column 26. Both ends of the flexible pipe 25 are connected to a heat medium heating tank (not shown). The heat medium heating tank is filled with a well-known heat medium oil and heated with an oil burner. In addition to supporting the flexible pipe 25, the support column 26 is also configured as a hot air blowing pipe. In other words, this standpipe 2
6 has an air outlet 27 on its circumferential surface, and its upper end is connected to a horizontal pipe 28. Hot air is introduced into the horizontal pipe 28 from the waste heat transfer device 65 and the preliminary hot air supply device 40.

Furthermore, a heat insulating material can also be used on the outer wall.

The heat source can be hot air, waste heat, solar heat, electric heat, etc.

This will be explained with reference to FIG. 2B.

A conveyor 12 is provided below the hopper 11. The asphalt recycled material stored for each particle size is discharged to the conveyor 12 in the required amount. The discharged asphalt recycled material is further conveyed to the next drum mixer conveyor 13 by the conveyor 12.

On the other hand, the drum mixer conveyor 13 is connected via a conveyor 18 to an aggregate storage device that stores unused aggregate. Generally, recycled asphalt is used in combination with virgin aggregate.

As an aggregate storage device, an indirectly heated hopper 15 as shown in FIG. 2A may be used, but is not limited thereto. Unused aggregate is discharged in the required amount and conveyed via conveyor 18 to drum mixer conveyor 13.

The asphalt recycled material and unused aggregate are combined on the drum mixer conveyor 13 and transported to the drum mixer 19.

The mixing ratio of aggregate and asphalt recycled material is 6:4.
Although a ratio of 8 to 2 is suitable, any mixing ratio can be controlled as necessary.

The aggregate and asphalt recycled material are thoroughly mixed in a drum mixer 19, and simultaneously heated and dried by a burner 29 to form an asphalt recycled mixture. The drum mixer 19 is also equipped with a preliminary hot air supply device 40. Also, compressor 2
9' is also attached. This is used to blow waste heat as a backup.

If the tank 51 is buried underground, thermal efficiency will be improved. It is also possible to add a heat storage chamber containing stones, etc. Further, the tank 51 may be connected to the front part or the middle part of the drum mixer 19. In the illustrated example, the tank 51 is connected to a mixer 82 at the outlet of the drum mixer 19. Asphalt, stone powder, softening agent, etc. from the tank 51 are added to this asphalt regenerated mixture to produce a regenerated asphalt mixture as a final product.

Skip hoist 3 is used for recycled asphalt mixture.
2 to surge bins 30 and 31 for storage. The number of surge bins is not limited.
Route 8 different from these surge bins 30 and 31
3 can be provided as a reserve to give flexibility to the mixing ratio.

In some cases, the asphalt regeneration mixture is first transferred to surge bins 30 and 3 by skip hoist 32.
1, and then mixed with asphalt, stone powder, a softening agent, etc., to produce a recycled asphalt mixture.

All operations of the present invention can be performed in the driver's cab 57. Further, it is connected to at least one of the asphalt regeneration device 23 or the pavement waste treatment device 1 and the drum mixer 19 by a waste heat transfer device,
The heated waste air from the drum mixer 19 is reused in at least one of the asphalt regeneration device 23 or the pavement waste treatment device 1. Furthermore, it is also possible to circulate the hot air used for heating the asphalt waste material, for example, from the asphalt regeneration device 23 to the pavement waste material processing device 1 one after another. Furthermore, it is also possible to provide a solar heat utilization type roof 67 above the apparatus of the present invention, and use the solar heat absorbed there to heat asphalt waste and other materials.

An exhaust fan 62 and a chimney 63 are provided at various places in the recycled asphalt mixture production apparatus of the present invention to perform exhaustion. The passages of these chimneys 63 are configured to be openable and closable.

Next, the operation of the present invention will be explained.

Truck 2 is used to excavate pavement waste materials such as asphalt waste materials and cement concrete waste materials.
Once it is transported to the recycling site and placed on the sieve 56, the pavement waste containing these various materials can be automatically recycled to produce recycled asphalt mixture.

First, particles of small size are sorted by a sieve 56,
Stockyards 33, 34, 3 by conveyor 3
5 and 36. Those with a relatively large particle size are put into a transfer device 58, conveyed along the pavement waste material conveying path 5, and transported to the pavement waste material processing device 1, where they are finely separated by a sieve. Most of the materials that cannot pass through this sieve are cement concrete waste materials, which are finely separated by the crusher 21 and stored in stockyards 37, 38, and 39.

The recycled asphalt material that has passed through the sieve is transported to the asphalt recycling device 23, where it is further finely separated.

The finely divided asphalt recycled material is sorted by particle size by a sieve 9 and stored in a hopper 11.

On the other hand, unused aggregates are also stored in an aggregate storage device, such as the indirect heating hopper 15, according to particle size. Unused aggregate and asphalt recycled materials are
A predetermined amount is supplied from each hopper and collected on the drum mixer conveyor 13. Then, it is well kneaded by a drum mixer 19,
It is heated and dried. Asphalt, stone powder, softening agent, etc. from the tank 51 are added to this asphalt regenerated mixture to produce a regenerated asphalt mixture as a final product.

Since the present invention is configured as described above, the waste heat of the drum mixer that heat-processes asphalt recycled material and unused aggregate is effectively utilized to produce various materials excavated from conventional pavement. Paving waste can be automatically processed to the final product, recycled asphalt mixture, which is very efficient. Moreover, since it does not require much manpower, labor costs can be saved. Furthermore, it is very economical because the heat is effectively reused without escaping.

Note that each device can be made into a unit to facilitate transportation.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a recycled asphalt mixture manufacturing apparatus according to the present invention, FIGS. 2A and 2B are plan views showing an example of the recycled asphalt mixture manufacturing apparatus according to the present invention, and FIG. 3 is a schematic diagram of a recycled asphalt mixture manufacturing apparatus according to the present invention. 4 is a schematic diagram showing an example of an asphalt regeneration device 23 used in the present invention, and FIGS. 5 and 6 are a sectional view showing an example of an asphalt recycling device 23 used in the present invention. It is a sectional view and a top view showing an example. DESCRIPTION OF SYMBOLS 1...Paving waste processing device, 5...Paving waste material conveyance path, 7, 21...Crusher, 11...Hopper, 13...Drum mixer conveyor, 16...
Heating device, 19... drum mixer, 20... hopper, 23... asphalt regeneration device, 24...
...Outlet, 25...Storage pipe, 26...Strut, 27...
...Air outlet, 28...Horizontal pipe, 29...Burner, 3
0, 31...Surge bin, 32...Skip hoist, 40...Preliminary hot air supply device, 42...Heating tube, 51...Tank, 55...Water tank, 57...Driver's cab, 58...Transfer device, 67... ...Roof, 71...
...waste heat transfer equipment.

Claims (1)

[Claims] 1. Paving waste transport path 5 for transporting paving waste
, a transfer device 58 disposed along the pavement waste transportation path 5 for transferring pavement waste including asphalt concrete waste and cement concrete waste, and for pouring boiling water onto the pavement waste transported by the transfer device. a water sprinkler 59, a vibrating sorting device 21 for separating and sorting the pavement waste heated by the hot water on the transfer device by vibration, and an aggregate storage device 15 containing unused aggregate. , a drum mixer 19 that heats the asphalt recycled material and unused aggregate transported from the sorting device, and supplies waste heat in the drum mixer to the transport path, and furthermore, this waste heat is used for aggregate storage. A recycled asphalt mixture manufacturing device equipped with a waste heat transfer device 64 that also supplies the inside of the device 15. 2. A relatively long heating cylinder 42, an asphalt waste supply device 44 provided at an inlet 42a at one end of the heating cylinder, and an outlet 42 at the other end of the heating cylinder 42.
Conveying devices 6 and 8 arranged in b, and a drum mixer 19 that heats the recycled asphalt material conveyed from the conveying devices and the unused aggregate in the aggregate storage device 15.
, a waste heat transfer device 64 that supplies the waste heat in the drum mixer to the heating cylinder so as to directly hit the asphalt waste, and a preliminary hot air supply that sends additional hot air into the heating cylinder so that it hits the asphalt waste directly. A device 40 and a blade 42c for stirring the asphalt waste charged into the heating cylinder from the inlet of the heating cylinder, the heating cylinder 42
Hot water is put into the inside of the heating cylinder, and the asphalt waste material charged from the heating cylinder entrance part 42a is softened by the waste heat directly sent into the heating cylinder, additional hot air and hot water directly sent, and the blade is stirred. separating the aggregates of the asphalt waste material from each other,
A recycled asphalt mixture manufacturing apparatus characterized in that the recycled asphalt material is conveyed to the drum mixer 19 by the conveying devices 6 and 8. 3 Pavement excavated from conventional pavement in a recycled asphalt mixture production equipment that heats and separates asphalt waste material to produce recycled asphalt material, and mixes unused aggregate and asphalt with the recycled asphalt material to produce recycled asphalt composite material. A first sieve 56 for inputting waste materials, a transfer device 58 for transferring the pavement waste materials including asphalt waste materials and cement concrete waste materials of relatively large particle size carried out from the first sieve, and the transfer device and a pavement waste transport path 5 connected to the first sieve, and connected to an end of the pavement waste transport path 5, dividing the pavement waste into the asphalt waste and the cement concrete waste,
Furthermore, a pavement waste treatment device 1 that separates only the asphalt waste material into finely divided asphalt recycled material; and an asphalt recycling device 23 that is connected to the pavement waste treatment device via a conveyor and further finely separates the asphalt recycled material. , a second sieve 9 connected to the asphalt regeneration device and for separating the asphalt recycled material from the asphalt regeneration device according to particle size; and a second sieve 9 connected to the second sieve via an elevator to store the asphalt recycled material according to particle size. A continuous hopper 11, an aggregate storage device 15 for storing the unused aggregate, and a continuous asphalt recycled material from the hopper and the aggregate storage device connected to the hopper and the aggregate storage device via a conveyor. A drum mixer conveyor 13 that conveys the unused aggregate from the device 15 together, and a drum mixer conveyor 13 that is connected to the drum mixer conveyor and conveys the asphalt recycled material in a predetermined mixing ratio and the unused aggregate that has been conveyed by the drum mixer conveyor. a drum mixer 19 for mixing the asphalt recycled mixture with aggregate and further heating and drying it to form an asphalt recycled mixture; a skip hoist 32 connected to the drum mixer for transporting the asphalt recycled mixture; and a skip hoist 32 connected to the skip hoist for transporting the asphalt recycled mixture surge bins 30 and 31 for storing the asphalt regenerated mixture, and furthermore, at least one of the asphalt regeneration device 23 or the pavement waste treatment device 1 and the drum mixer 19 are connected by a waste heat transfer device 71. In addition, the aggregate storage device 15 and the hopper 11 are also connected to the drum mixer 19 by a waste heat transfer device 71, and the waste heat of the drum mixer is transferred to at least one of the asphalt regeneration device or the pavement waste treatment device; A recycled asphalt mixture manufacturing apparatus characterized in that the aggregate storage device 15 and the hopper 11 for recycled asphalt material are also reused.