JPS641601B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing recycled composite material using waste bituminous pavement laid as road paving material.

Asphalt pavement, which is commonly used in Japan, is made by heating and mixing asphalt with adjusted coarse aggregate, fine aggregate, filler, etc., to create a composite material, which is spread under high temperature and then rolled. The main method used is to use rolling pressure. On the other hand, a large amount of bituminous pavement waste is generated when repairing ruts that occur on the pavement surface, or when resurfacing for road construction such as water supply and sewage systems, or refinement. The above-mentioned bituminous pavement waste materials have been disposed of as industrial waste, but from the viewpoint of urban pollution control and resource conservation, the necessity of reusing the waste materials has been emphasized, and efforts are being made to put this into practice. Although several methods have been introduced in this embodiment, the present invention relates to a heat exchange method. In other words, when bituminous pavement waste is added to heated aggregate in a mixer, and the bituminous material is heated and mixed to produce recycled composite material, the water mixed in the bituminous pavement waste is instantly released. There was a risk that the gas would turn into water vapor and generate gas containing a large amount of moisture and dust, which would not only contaminate the work environment but also become a source of pollution to the surrounding area.

The present invention has been made in view of the above, and aims to realize an apparatus that can suppress sources of pollution and efficiently produce recycled composite material.

Next, embodiments of the present invention will be described based on the drawings. FIG. 1 is a schematic flow sheet showing an example of an asphalt plant including a recycled composite material manufacturing apparatus according to the present invention.

In FIG. 1, bituminous pavement waste transported by a vehicle 1 such as a truck is sent to a geo crusher 4 via a storage tank 2 and a conveyor 3 and crushed, while coarse particles are crushed using an impact crusher 5. The waste materials are crushed and sieved into particles of different sizes using sieves 6 and 7, and stored in a waste material bin 8 according to particle size. It should be noted that not all of the waste materials are used, but only those suitable for use,
For example, only sieved waste material with a diameter of 0 to 13 mm may be used.

On the other hand, new aggregates are classified into crushed stone, sand, screenings, etc., and stored in aggregate bins 9 after being divided into sections. One or more aggregates selected from among these are dried by a dryer 10 and then supplied to a vibrating sieve 12 separately installed at a high position using a bucket conveyor installed in a hot elevator 11. do.

Moisture or dust generated in the dryer 10 is sent to a dry cyclone 14 through a duct 13, passes through a flue 15, a No. 1 exhaust fan 16, a flue 17, and is further sent to a bag filter 18, where it is made pollution-free. The gas is discharged through the flue 19, No. 2 exhaust fan 20, and chimney 21. A so-called wet dust collector may be used instead of the bag filter 18. Further, it is possible to operate only the No. 2 exhaust fan 20 by changing its performance. Further, separately prepared stone powder is transported upward using a bucket conveyor installed in the stone powder elevator 22 and temporarily stored in a stone powder bin 23.

Each of the above-mentioned devices is common, and the present device utilizes them, but the means and structure for supplying new aggregate, bituminous waste material, stone powder, asphalt, etc. from the above-mentioned devices to the mixer are It was improved as follows. That is, as shown in detail in FIG. 3, a fade cover 29 with a large diameter and high extension is provided at the upper end of the upward opening of the mixer 28, and a hot bin 24 for new aggregate is placed in the upward opening of the fade cover 29. is fitted to close the upward opening of the fade cover 29 and are integrally sealed.

The hot bin 24 has a hopper-like shape with a large upper part and a smaller lower part, and the inside is partitioned with partition walls 24a so that aggregate particles of different sizes can be accommodated.

Inside the fade cover 29, an aggregate measuring tank 25 is suspended below the hot bin 24 and above the mixer 28 to serve as a tare for the weighing machine 25a. When the material is added, the aggregate weighing tank 25 depends on its weight.
falls, the amount of descent is sensed and measured by a sensor (not shown) of the weighing machine 25a, and the value is displayed on a separate digital meter (not shown).

On the inner side of the fade cover 29, a waste material chute 8a connected to the waste material bin 8 is attached to the upper part of the aggregate measuring tank 25, with its drop-in port facing the upper opening of the aggregate measuring tank 25. The waste material chute 8a is formed into a cylindrical shape and is configured to be able to measure a certain volume.

Inside the fade cover 29, adjacent to the aggregate measuring tank 25, a stone powder measuring tank 27 is suspended like a tare of a weighing machine 27a. Further, a stone powder chute 23a connected to the stone powder bin 23 is attached to the side of the fade cover 29 adjacent to the stone powder measuring tank 27, and a drop-in opening of the stone powder chute 23a faces the upper opening of the stone powder measuring tank 27.

An asphalt measuring tank 26 is suspended from the outside of the fade cover 29, and an asphalt delivery device 26a is attached to the lower part of the tank, and its injection nozzle 26
b from the fade cover 29 to the inner mixer 28
It is facing towards the top.

In the above configuration, the fade cover 29 is further provided with two discharge pipes 3 symmetrically arranged above the mixer 28 and on the side where the aggregate measuring tank 25 is disposed.
No. 0 and 30 are attached so that their pipe holes communicate with the inside of the fade cover 29, and the tips of each of the exhaust pipes 30 and 30 are connected to an exhaust duct 31 connected to a No. 3 exhaust fan 32. The No. 3 exhaust fan 32 is the exhaust duct 3
3 to the bag filter 18, and the output side of the No. 1 exhaust fan 16 is also connected to the input side of the bag filter 18.

Automatic dampers 34, 34 are installed at appropriate positions in both the exhaust pipes 30, 30 to control the airflow within the exhaust pipes 30, 30. The damper 34 is opened and closed using air, electricity, hydraulic pressure, etc., and can be opened and closed at predetermined intervals using a timer, and can also be linked to the No. exhaust fan. can.

According to the present invention having the above structure, the new aggregate classified according to particle size by the vibrating sieve 12 shown in FIG. 1 is stored in the aggregate hot bin 24 in sections.

First, the particle size of the new aggregate should be changed to "large" or "medium".
When classified as "small" and "sand,""large" aggregate is put into the aggregate measuring tank 25, a predetermined amount is weighed, and the charging is stopped, and then "medium" aggregate is put into the aggregate measuring tank 25. , measure a predetermined amount and stop adding the aggregate, then put the waste from the waste bin 8 into the aggregate measuring tank 25, weigh the predetermined amount, stop adding, and then add the "small" bones. A predetermined amount of aggregate material and "sand" are each put into the aggregate measuring tank 25 and weighed.

As shown in Figure 2, the input state is in a stacked state with large A, medium B, waste C, small D, and sand E.
Waste material C has new aggregate A with high temperature (around 200℃) on the top and bottom.
The waste material is sandwiched between B, D, and E, and the waste material can be heated within this aggregate measuring tank 25 by primary heat exchange. The reason why new aggregates were introduced in the above process, starting from the largest ones, was to increase the efficiency of heating the waste material through heat exchange, as larger aggregates have better heat retention and heat will rise. As described above, in the present invention, since the new aggregate hot bin 24 and the waste material chute 8a are arranged directly above the aggregate measuring tank 25, new aggregates and waste materials are measured each time they are introduced into the aggregate measuring tank 25. In addition, the waste material can be heated in the aggregate measuring tank 25 by heat exchange.

The moisture contained in the waste material evaporates when the waste material is heated, but by operating the No. 3 exhaust fan 32, steam, etc. is efficiently removed to the outside through the exhaust pipes 30, 30 attached to the side of the fade cover 29. can be discharged.

Next, the aggregate in the aggregate measuring tank 25 is dropped into the mixer 28 below, and the stone powder is weighed in the stone powder measuring tank 27, and a predetermined amount of stone powder is also dropped into the mixer 28.

Furthermore, if necessary, the asphalt is measured in the asphalt measuring tank 26, and the asphalt is delivered to the mixer 28 from the injection nozzle 26b via the delivery device 26a.
Squirt inside. By operating the mixer 28, the above-mentioned materials are mixed. In this process, the waste material is further heated by heat exchange, and water vapor, dust, and blue smoke are generated, but these are efficiently discharged from the discharge pipes 30, 30. The degree of discharge is controlled by adjusting the degree of opening and closing of the dampers 34, 34, as well as by adjusting the manual damper 35 of the exhaust duct 31.

The apparatus of the present invention constructed as described above has a fade cover extending over the top of the mixer, an aggregate hot bin on the fade cover, and a sealed structure, and the waste material is converted into new aggregate and new aggregate within the sealed fade cover. Since it is configured to be heated and mixed with asphalt, stone powder, etc., it is possible to detoxify pollution sources such as steam, gas, blue smoke, and dust generated during this heating and mixing process without leaking them to the outside. There is an effect that can be done.

FIG. 4 shows one embodiment in which bituminous pavement waste is fed by a conveyor system. That is, bituminous pavement waste crushed by an impact crusher or a geo crusher as described above is dropped from the input section 36 into the waste material hopper 39 via the storage tank 37 and the screw or belt feeder 38. The waste material is transported from below the waste material hopper 39 to the waste material bin 8 by a first belt conveyor 40 and a second belt conveyor 41. Adjacent hot bin 2
4. The configuration of the aggregate measuring tank 25, mixer 28, etc. is the same as the example shown in FIG. It is put into the tank 25. The bituminous pavement waste supply mechanism is not limited to the above, and any means can be used.

The present invention relates to a recycled composite material manufacturing apparatus using bituminous pavement waste having the above-described configuration, and has a number of excellent effects described below.

(b) A hot bin is placed above the mixer, and the hot bin and mixer are connected and sealed with a fade cover, so pollution sources such as gas, water vapor, and dust generated inside the mixer do not leak to the outside, reducing pollution. There is no fear.

(b) Two discharge pipes are attached to the fade cover in symmetrical positions, and the discharge pipes are connected to the bag filter via an exhaust pipe and an exhaust fan, and are also used to discharge a dryer that dries the new aggregate added to the mixer. The side can be connected to the input side of the bag filter through a dry cyclone and the first exhaust fan to exhaust air to the chimney, and an automatic opening/closing damper is attached to the exhaust pipe, so the exhaust from the top of the mixer can be controlled. The inside is sealed, so
It is possible to control the moisture content, temperature, etc. of the recycled composite material.

(c) Since a hot bin for new aggregate and a waste material chute are installed above the aggregate measuring tank, the required amount of new aggregate and waste material can be measured in total using the aggregate measuring tank. In addition, by alternately charging high-temperature new aggregate and room-temperature waste material into the aggregate measuring tank, the waste material can be heated efficiently through heat exchange, and there is no heat loss.

(d) As mentioned above, it is possible to mix waste materials between new aggregates in a sandwich-like manner in an aggregate measuring tank, thereby making it possible to efficiently warm room-temperature waste materials through heat exchange; During this heat exchange process, the moisture contained in the waste material becomes steam and can be removed from the exhaust pipe along with the generated gas. By this, before mixing with stone powder, asphalt (heated), etc., the moisture in the waste material is removed in advance to reduce the water content, degassing, and kneading together with each material in the mixer below. Since it is well kneaded and generates little steam and gas, it is possible to efficiently produce high-quality recycled composite materials.

[Brief explanation of drawings]

The drawings relate to the present invention, and Fig. 1 is a schematic flow sheet of an asphalt plant including the device of the present invention, Fig. 2 is a schematic cross-sectional view showing a mode of heat exchange of bituminous waste in an aggregate measuring tank, and Fig. 3. FIG. 4 is a front view of the configuration of the recycled composite material manufacturing device, and FIG. 4 is a front view showing a system for supplying bituminous pavement waste to the waste material bin of the recycled composite material manufacturing device. 1... Vehicle, 2... Storage tank, 3... Conveyor,
4... Diy crusher, 5... Impact crusher, 6, 7... Sieve, 8... Waste material bin, 8
a... Waste material chute, 9... Aggregate bin, 10...
Dryer, 11...Hot elevator, 12...
... Vibrating sieve, 13... Duct, 14... Dry cyclone, 15, 17... Flue, 16... No. 1 exhaust fan, 18... Bag filter, 19... Flue, 2
0...No.2 exhaust fan, 21...Chimney, 22...Stone powder elevator, 23...Stone powder bin, 23a...Stone powder chute, 24...Hot bin, 24a...Division wall, 25...Aggregate measuring tank , 25a...Measuring instrument, 2
6... Asphalt measuring tank, 26a... Asphalt delivery device, 26b... Injection nozzle, 27...
Stone powder measuring tank, 27a...Measuring instrument, 28...Mixer, 29...Fade cover, 30...Discharge pipe,
31, 33... Exhaust duct, 32... No. 3 exhaust fan, 34... Automatic damper, 35... Manual damper, 36... Input section, 37... Storage tank, 38...
Screw or belt feeder, 39... Waste material hopper, 40... First belt conveyor, 42...
...screw or belt feeder chute, 4
1...Second belt conveyor.

Claims (1)

[Claims] 1. An aggregate measuring tank is installed above the mixer, a classification hot bin is installed above the aggregate measuring tank, and
The aggregate measuring tank and the mixer are connected and sealed with a fade cover, and a discharge pipe having an automatic opening/closing damper is attached to the side of the fade cover, and the discharge pipe is connected to a third exhaust duct with an exhaust fan, The exhaust duct is connected on its output side to the suction side of the chimney via a bag filter and a second exhaust fan, and on the discharge side of a dryer for drying the fresh aggregate added to the mixer is connected to a dry cyclone and a first air exhaust duct. It is connected to the input side of the bag filter via an air exhaust fan, and a stone powder measuring tank is installed on the side of the aggregate measuring tank, and a stone powder chute is interposed between the external stone powder bin and the stone powder measuring tank. A waste material chute connected to an external waste material bin is installed above the aggregate measuring tank, and an asphalt measuring tank is installed outside the fade cover, and an injection nozzle of an asphalt delivery device attached to the bottom thereof is installed. A device for producing recycled composite material using bituminous pavement waste, characterized by being installed above a mixer.