JPH052042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a composite material production method in which a composite material is produced by drying and heating new aggregate and recycled aggregate in a double dryer that also serves as recycling.

[Conventional technology]

Conventionally, in asphalt plants, when producing recycled composite material by mixing recycled aggregate with new aggregate,
In order to prevent the asphalt components contained in the recycled aggregate from deteriorating or burning, overheated new aggregate and room temperature recycled aggregate are mixed in a mixer, and the recycled aggregate is heated with the new aggregate. Alternatively, a dryer dedicated to recycled aggregate can be installed in the asphalt plant to heat the recycled aggregate, and this can be mixed with new aggregate heated in another dryer to produce recycled composite material. It has produced.

[Problem that the invention seeks to solve]

However, in the former case, there are restrictions on heating the new aggregate in terms of equipment or thermal efficiency, and it is not possible to heat the recycled aggregate according to theory, so the recycled aggregate tends to be insufficiently heated. There is some dissatisfaction with the fact that it is practically impossible to increase the percentage of recycled aggregate mixed in by more than 20%. In addition, the produced recycled composite material has the disadvantage that the asphalt properties contained in the recycled aggregate are not restored, making it unfavorable in terms of quality.

In the latter case, although there is no disadvantage as mentioned above, in addition to the dryer for new aggregate, it is necessary to take the trouble to install a dedicated dryer for recycled aggregate, which increases the complexity of the equipment and increases equipment costs. Moreover, there is a problem in that the operating cost is high and it is economically inferior.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an outer cylinder having a first exhaust manifold at one end, a second exhaust manifold at the middle, and an outer exhaust manifold at the other end; heating means provided in the first discharge manifold of the outer cylinder;
A recycled aggregate discharge chute and a heated gas intake are provided at one end, and an inner cylinder exhaust manifold is provided at the other end. The manifolds are respectively disposed in the outer cylinder exhaust manifold, and an inner cylinder is provided concentrically with the outer cylinder at the center of the outer cylinder with a gap formed between the manifolds and the outer cylinder. A new aggregate input means for inputting new aggregate into the inner cylinder, a recycled aggregate input means for inputting recycled aggregate into the inner cylinder, and the outer cylinder exhaust manifold via an exhaust duct individually equipped with a damper. A dual recycling dryer equipped with a dust collector connected to the inner cylinder exhaust manifold and an exhaust fan attached to the dust collector is used to rotate the outer cylinder and the inner cylinder in the circumferential direction. While operating the heating means and exhaust fan, new aggregate is charged into the outer cylinder by the new aggregate charging means, recycled aggregate is charged into the inner cylinder by the recycled aggregate charging means, and the heating means is turned on. The heated gas generated during operation is transferred to the gap between the outer cylinder and the inner cylinder,
The new aggregate and the recycled aggregate are respectively heated to predetermined temperatures by passing them into the inner cylinder at a rate determined by the opening degree of the damper of the outer cylinder exhaust manifold and the damper of the inner cylinder exhaust manifold. The aggregate is discharged from a first discharge manifold and a second discharge manifold, and the new aggregate and recycled aggregate are mixed in a mixer to produce a composite material.

[Effect]

While rotating the outer cylinder and the inner cylinder in the circumferential direction and operating the heating means and exhaust fan to send heated gas into the outer cylinder, new aggregate is introduced into the outer cylinder by the new aggregate injection means. At the same time, recycled aggregate is charged into the inner cylinder by the recycled aggregate charging means. The new aggregate put into the outer cylinder as described above gradually moves to the first discharge manifold side through the gap between the outer cylinder and the inner cylinder, is dried and heated by the heated gas, and is discharged from the first discharge manifold. At the same time, the recycled aggregate introduced into the inner cylinder is dried and heated by heated gas fed into the inner cylinder from the intake port at one end, and is discharged from the second discharge manifold.

The new aggregate discharged from the first discharge manifold of the outer cylinder and the recycled aggregate discharged from the second discharge manifold are mixed in a mixer to obtain a composite material.

In the above, when adjusting the heating temperature of new aggregate and recycled aggregate, by changing the relative opening degree of the damper of the outer cylinder exhaust manifold and the damper of the inner cylinder exhaust manifold, the outer cylinder and the inner cylinder can be adjusted. The temperature of the new aggregate and recycled aggregate is adjusted by changing the gap between the two and the amount of heated gas passing through the inner cylinder.

〔Example〕

FIGS. 1 and 2 show an example of a double recycling dryer embodying the present invention, and in these figures, reference numeral 1 denotes an inclined outer cylinder having a circular cross-sectional shape. This inclined outer cylinder 1 has a pivot 2 and a jack 3.
It is mounted in an inclined state on a supporting roller 5 on a base 4 which is supported by a pivot shaft 2 and can be tilted vertically about a pivot 2 as a fulcrum, and is rotated in a circumferential direction by a rotary drive device (not shown) as is well known. It is configured so that it can be rotated. Lower end (one end) of inclined outer cylinder 1
A lower exhaust manifold (first exhaust manifold) 6, an intermediate exhaust manifold (second exhaust manifold) 7, and an outer cylinder exhaust manifold 8 are respectively provided at the middle and upper end (other end). It is fixed to stand 4.

The lower discharge manifold 6 is provided with heating means 9 such as a burner, and a gap 11 is formed between the inner cylinder 10 and the inclined outer cylinder 1 at the center of the upper end of the inclined outer cylinder 1. It is provided concentrically with the inclined outer cylinder 1. This inner cylinder 10 is for drying and heating the recycled aggregate, and has a recycled aggregate discharge chute 12 and a heated gas intake port 13 at its lower end (one end).
In addition, the inner cylinder exhaust manifold 1 is attached to the upper end (other end).
4, the exhaust chute 12 is disposed at the intermediate exhaust manifold 7 of the inclined outer cylinder 1, and the inner exhaust manifold 14 is disposed at the outer exhaust manifold 8.
It is fixed to the inclined outer cylinder 1 by a rod-shaped support 15.

In addition, the outside air inlet 1 of the exhaust manifold 7
6 is provided with an opening/closing member 17 that can be opened and closed by a hinge 18, and a recycled aggregate discharge feeder 19 is provided at the lower part of the upper discharge manifold 7. Furthermore, the outer cylinder exhaust manifold 8 is provided with new aggregate feeding means 20 such as a belt conveyor for feeding new aggregate into the inclined outer cylinder 1, and the inner cylinder exhaust manifold 14 is provided with a new aggregate feeding means 20 for feeding new aggregate into the inclined outer cylinder 1. A feeding means 21 for recycled aggregate, such as a belt conveyor, for feeding the material into the inner cylinder 10 is provided. and intake 1
3 is provided with blades 22 radially, and the inner cylinder 1
0 and flips the recycled aggregate to the right in FIG. 1, thereby preventing the recycled aggregate from falling into the inclined outer cylinder 1.

The outer cylinder exhaust manifold 8 and the inner cylinder exhaust manifold 14 are provided with exhaust ducts 25 and 26 respectively equipped with dampers 23 and 24, and each exhaust duct 25 and 26 is equipped with an exhaust fan 27 and a damper 28. The dust collector 29 is connected to the duct 30 of the dust collector 29. A differential pressure switch 31 provided in the lower discharge manifold 6 is electrically connected to the damper 28, and when the pressure inside the inclined outer cylinder 1 becomes too low, the damper 28 moves in the closing direction and When the pressure inside the outer cylinder 1 becomes too high, it moves in the opening direction to maintain the pressure inside the outer cylinder 1 within a predetermined range.

Reference numeral 32 designates a chimney, and 33 and 34 designate well-known scraping blades provided on the inner circumferential surfaces of the inclined outer cylinder 1 and the inner cylinder 10.

In addition, the above-mentioned recycling double dryer has the following features:
Normally, there is a hot elevator that receives new aggregate discharged from the lower discharge manifold 6 via a feeder, a screen that sieves the new aggregate received from the hot elevator according to particle size, and a screen that stores the new aggregate sieved by the screen according to particle size. a hot bin, a weighing hopper disposed below the hot bin, a mixer disposed below the weighing hopper, and a conveyor for receiving recycled aggregate discharged from the discharge feeder of the intermediate discharge manifold. A well-known batch tower (not shown) is connected thereto, and comprises a surge bin for storing the recycled aggregate and putting the recycled aggregate into the weighing hopper as required.

Next, a method for producing composite material according to the present invention using the dual recycling dryer configured as described above will be explained.

While rotating the inclined outer cylinder 1 and the inner cylinder 10 in the circumferential direction, operating the exhaust fan 27, and feeding heated gas into the inclined outer cylinder 1 by operating the heating means 9,
New aggregate is charged into the inclined outer cylinder 1 by the new aggregate charging means 20, and recycled aggregate is charged into the recycled aggregate charging means 21.
into the inner cylinder 10.

The new aggregate placed in the inclined outer cylinder 1 moves to the lower end of the inclined outer cylinder 1 through the gap 11 between the inclined outer cylinder 1 and the inner cylinder 10, and is discharged from the lower discharge manifold 6. During this time, the heated gas is dried and heated in a countercurrent manner by the heating gas moving from left to right in FIG. 1 inside the inclined outer cylinder 1. The recycled aggregate placed in the inner cylinder 10 passes between the blades 22 at the intake port 13 and is heated by the heated gas introduced into the inner cylinder 10 as shown in FIG. It gradually moves to the left and is discharged from the discharge chute 12 to the discharge feeder 19 of the intermediate discharge manifold 7. New aggregate discharged from the lower discharge manifold 6,
The recycled aggregate discharged from the discharge feeder 19 is finally mixed in a mixer of a batch tower to form a recycled composite material.

The heated gas that has worked to dry and heat the new aggregate and recycled aggregate is transferred to the outer cylinder exhaust manifold 8 by the action of the exhaust fan 27.
and inner cylinder exhaust manifold 14, and exhaust duct 2
5 and 26, enters a dust collector 29, where dust and the like are removed and cleaned, and then released into the atmosphere from a chimney 32.

In the above, when the heating temperature of the new aggregate is lower than a predetermined temperature, the opening degree of the damper 23 is increased, the opening degree of the damper 24 is decreased, and the gap 11 between the outer cylinder 1 and the inner cylinder 10 is Increase the amount of heated gas passing through. If the temperature of the recycled aggregate is lower than the expected temperature, the opening degree of the damper 24 is increased, the opening degree of the damper 23 is decreased, and the amount of heated gas passing through the inner cylinder 10 is increased. Needless to say, if the temperature of the new aggregate is high or the temperature of the recycled aggregate is high, the dampers 23 and 24 will be opened and closed in the opposite manner. For some reason, damper 2
If the overall opening degree of the valves 3 and 24 becomes too large and the pressure inside the outer cylinder 1 becomes low, the damper 28 is rotated in the closing direction by a signal from the differential pressure switch 31.

The temperature adjustment of the new aggregate and recycled aggregate is basically as described above, but if, for example, the temperature of both the new aggregate and recycled aggregate is too high or too low, the heating means 9 may be adjusted. or adjust the input amount of new aggregate and recycled aggregate. Furthermore, the temperature inside the inner cylinder can be lowered by opening the opening/closing member 17 and introducing outside air into the inner cylinder.

Normally, a computer (not shown) is connected to the dampers 23 and 24, and the dampers 23 and 24 are controlled based on the set temperatures of the new aggregate and recycled aggregate, their actual heating temperatures, the temperature of the heating gas, etc. The opening degree is controlled by computer. When the opening degrees of the dampers 23 and 24 are controlled manually or by computer, in either case, the maximum heating temperature of the recycled aggregate and the mixture temperature are set to prevent the asphalt components of the recycled aggregate from burning or deteriorating. Therefore, the composite material at a predetermined temperature can be produced. The form of automatic control by computer is
Generally, it is proportional control, but it is not limited to this. The dust collector 29 can be a dry type dust collector such as a bag filter, a wet type dust collector such as a water scrubber, or a combination of both dry and wet types, but the specific structure is arbitrary. It is.

〔Effect of the invention〕

As explained above, the method for producing composite material using the dual recycling dryer according to the present invention includes a first exhaust manifold at one end, a second exhaust manifold at the middle, and an outer cylinder exhaust manifold at the other end. an outer cylinder, a heating means provided in the first discharge manifold of the outer cylinder, a recycled aggregate discharge chute and a heated gas intake at one end, and an inner cylinder exhaust at the other end. each manifold, and the discharge chute is connected to the second part of the outer cylinder.
The inner cylinder exhaust manifold is arranged in the exhaust manifold part, and the inner cylinder exhaust manifold is arranged in the outer cylinder exhaust manifold part, and a gap is formed between the inner cylinder exhaust manifold and the outer cylinder, and the inner cylinder exhaust manifold is arranged concentrically with the outer cylinder in the center of the outer cylinder. An inner cylinder provided, a new aggregate input means for inputting new aggregate into the outer cylinder, a recycled aggregate input means for inputting recycled aggregate into the inner cylinder, and a damper are individually provided. A double dryer for recycling is equipped with a dust collector connected to the outer cylinder exhaust manifold and the inner cylinder exhaust manifold through an exhaust duct, and an exhaust fan attached to the dust collector. While rotating the inner cylinder and the inner cylinder in the circumferential direction, and operating the heating means and exhaust fan, new aggregate is charged into the outer cylinder by the new aggregate charging means, and the recycled aggregate is loaded into the outer cylinder. The heated gas generated by the operation of the heating means is injected into the inner cylinder by the injection means, and is transferred into the gap between the outer cylinder and the inner cylinder and into the inner cylinder by the damper of the outer cylinder exhaust manifold and the damper of the inner cylinder exhaust manifold. By passing the new aggregate and recycled aggregate at a rate determined by the opening degree of the damper, the new aggregate and recycled aggregate are heated to a predetermined temperature and discharged from the first discharge manifold and the second discharge manifold, and the new aggregate is and recycled aggregate are mixed in a mixer to obtain a composite material, so it is possible to quickly and accurately produce a composite material at a desired temperature that is a mixture of new aggregate and recycled aggregate in a desired ratio. be able to. In addition, since the heated gas generated by the heating means is divided into two parts in the outer cylinder and the new aggregate and recycled aggregate are dried and heated to the optimum temperature, there is no waste and the recycled aggregate It does not burn or deteriorate the asphalt components. Furthermore, compared to the case where two dryers are installed to dry and heat new aggregate and recycled aggregate to produce a composite material, the equipment cost and operating cost are low and it is economical.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a double dryer for recycling which implements the composite material production method according to the present invention, and FIG. 2 is a cross-sectional view of the portion shown in FIG. 1. 1... Outer cylinder, 6... First discharge manifold, 7
...Second exhaust manifold, 8...Outer cylinder exhaust manifold, 9...Heating means, 10...Inner cylinder, 11
...Gap, 12...Exhaust chute, 13...Intake, 14...Inner cylinder exhaust manifold, 20...
Input means for new aggregate, 21... Input means for recycled aggregate, 23... Damper, 24... Damper, 25...
Exhaust duct, 26...exhaust duct, 27...exhaust fan, 29...dust collector.

Claims (1)

[Claims] 1 An outer cylinder having a first exhaust manifold at one end, a second exhaust manifold at the middle, and an outer cylinder exhaust manifold at the other end, and a heating device provided in the first exhaust manifold of this outer cylinder. means, a recycled aggregate discharge chute and a heating gas intake at one end, and an inner cylinder exhaust manifold at the other end, the exhaust chute being connected to the second exhaust manifold portion of the outer cylinder; an inner cylinder arranged concentrically with the outer cylinder at the center of the outer cylinder, with an inner cylinder exhaust manifold disposed in each part of the outer cylinder exhaust manifold, and a gap formed between the inner cylinder and the outer cylinder; A new aggregate input means for inputting new aggregate into the outer cylinder, a recycled aggregate input means for inputting recycled aggregate into the inner cylinder, and an exhaust duct each equipped with a damper. A double recycling dryer equipped with a dust collector connected to the outer cylinder exhaust manifold and the inner cylinder exhaust manifold, and an exhaust fan attached to the dust collector is used to dry the outer cylinder and the inner cylinder in the circumferential direction. While rotating and operating the heating means and exhaust fan, new aggregate is introduced into the outer cylinder by the new aggregate input means, and recycled aggregate is introduced into the inner cylinder by the recycled aggregate input means. put it in,
The heated gas generated by the operation of the heating means is pumped into the gap between the outer cylinder and the inner cylinder and into the inner cylinder at a rate determined by the opening degree of the damper of the outer cylinder exhaust manifold and the damper of the inner cylinder exhaust manifold. By passing the new aggregate and recycled aggregate, they are heated to a predetermined temperature and discharged from the first discharge manifold and the second discharge manifold, and the new aggregate and recycled aggregate are mixed in a mixer. A method for producing composite material using a double dryer that also serves as recycling, which is characterized in that the composite material is obtained by using a double dryer for recycling.