JPS6052241B2 - Heated aggregate storage type asphalt plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an asphalt plant equipped with a hot aggregate silo for storing various heated and dried aggregates according to particle size.

Conventionally, in this type of asphalt plant, various aggregates heated, dried and mixed in a drying device are sieved by particle size using a vibrating screen placed above the hot aggregate silo, and then stored in the hot aggregate silo. The aggregates are put into a plurality of storage chambers for different particle sizes and stored, and then, if necessary, various aggregates are taken out according to particle size from the hot aggregate silo and made into a composite material, and additives such as molten asphalt are added thereto. It is known that an asphalt mixture is produced by mixing the two.

However, in such asphalt plants, various types of raw aggregate are heated, dried, and mixed in a drying device, and then sieved by particle size by vibration of a vibrating screen and stored in a designated storage room. , the sieving efficiency of the vibrating screen changes due to changes in the feed rate of various mixed aggregates or their mixing ratio, resulting in a change in the particle size of the aggregates that should be put into a predetermined storage chamber for each particle size. As a result, when each particle size is taken out from the hot aggregate silo to produce a mix, the particle size of each aggregate taken out is not constant, and the quality of the mix produced is unstable. This caused many problems.

In addition, in order to eliminate these problems and obtain a composite material with stable quality, we have installed drying equipment for each particle size of each type of aggregate to prevent mixing of aggregates with different particle sizes and to dry the aggregates individually. Material heating/
Some are designed to allow drying, and some are even equipped with hot aggregate silos for each aggregate particle size.

Although these asphalt plants have solved the above-mentioned problems, the following points still remain to be improved. That is, installing drying equipment and associated equipment for each particle size of various aggregates increases the cost of asphalt plants and increases the equipment area. This invention was made in view of the conventional circumstances mentioned above, and includes a single drying device that heats and dries various types of aggregate for each particle size, and a single drying device that is transported from this single drying device. Equipped with a hot aggregate silo that stores aggregate heated and dried for each particle size in a plurality of storage chambers arranged in an annular manner through a horizontally rotating chute,
In addition, by housing the mixer in a recess dug into the ground, the problems of the conventional method are resolved, and a mixed material of stable quality can be obtained.In addition, it is advantageous in terms of cost and installation area. It is possible to accurately feed dry aggregate by particle size into multiple storage chambers using chutes, and the height of the hot aggregate silo above ground is as low as possible to ensure stability and strength. Moreover, the purpose is to provide a heated aggregate storage type asphalt plant that is easy to maintain. It is something that

The present invention will be explained below based on an embodiment shown in FIGS. 1 and 2.

What is indicated by the symbol A in the figure is a heated aggregate storage type asphalt plant (hereinafter referred to as an asphalt plant), and this asphalt plant A includes a plurality of stock devices 1, 1, and 1, which store aggregate B according to particle size B1 to B4. . . . and a single drying device connected to these stock devices 1, 1, . . . by a conveying device 2, and heating and drying the raw aggregate B for each particle size. A device 3 and a plurality of storage chambers D1 to D4 for storing the heated and dried aggregate C according to particle size B1 to B4 are formed therein, and the aggregate C is transported from the drying device 3 by a conveying device 4. A hot aggregate silo 6 provided with a chute 5 for charging the heated and dried aggregate C into storage chambers D1 to D4 corresponding to particle sizes B1 to B8, and a discharge port 7 of the hot aggregate silo 6. 7...
The mixer 9 is connected to the mixer 9 via a metering device 8, and an asphalt supply device 10 supplies melted asphalt E into the mixer 9.

At the bottom of each of the stock devices 1, 1..., an openable and closable discharge port 11, 11... is provided, and the stock devices 1, 1...・
. . . Raw aggregates B are stored in grain sizes of 8 to B4.

The conveyance device 2 has feeders 12, 12 arranged opposite to the discharge ports 11, 11 of the stock devices 1, 1..., and is arranged continuously to the feeders 12, 12, and
It is comprised of belt conveyors 13 and 14 that communicate with the drying device 3 and the feeders 12, 12.

This conveyance device 2 includes stock devices 1, 1, . . .
. . The raw aggregate B contained therein is transported to the drying device 3. The drying device 3 has a well-known structure including a rotating drum 15 rotated by a suitable driving means (not shown) and a heating burner 16 feeding hot air into the rotating drum 15.

The drying device 3 heats and dries the raw aggregate B transported by the transport device 2 to a predetermined temperature and moisture content, and then discharges it to the subsequent transport device 4. is being done. The conveyance device 4 has a packet conveyor (not shown) therein, and is provided with a lower chute 18 connected to the drying device 3 through a top size screen 17 at the lower side (lower side in FIG. 1). heating and heating supplied from the top size screen 17.
The dried aggregate C is guided into the packets of the packet conveyor. Further, above the conveying device 4 (upper side in FIG. 1), an upper chute 2 is provided which penetrates and projects into the upper space 19 of the hot aggregate silo 6.
0 is provided, and the heated and dried aggregate C conveyed from the bottom to the top by the packet conveyor is thrown into the hot aggregate silo 6. The hot aggregate silo 6 has a chute 5 in its upper space 19.
A belt conveyor 21 is disposed that communicates one end with the upper chute 20 of the conveying device 4, and is configured to input aggregate C from the upper chute 20 into the chute 5. In addition, above each storage chamber D1 to D4 formed in the hot aggregate silo 6, an input port 22,
22... are formed, and each of the input ports 22, 22... is provided with a slide gate 23.
, 23, . . . are provided. Further, the chute 5 is arranged so that the other end can horizontally rotate around one end, and the other end is connected to the input ports 22, 22.
... It is possible to stop facing any one of .... And slide gates 23, 23...
The opening and closing of the chute 5, the rotation of the chute 5, and the facing of the chute 5 to the input port 22 can be performed by remote control in accordance with the particle size of the aggregate C input from the upper chute 20. On the other hand, storage rooms D1 to D in the hot aggregate silo 6,
As shown in FIG. 2, the partition walls 24, 24...
The hot aggregate silos 6 are formed by partitioning the hot aggregate silos 6 in a radial manner and are arranged in a ring shape, and
They are divided so that their volume ratios match the designed mix of aggregate C. Further, a heat insulating material 25 is attached to the outer surface of the side wall of the hot aggregate silo 6 in order to prevent the temperature of the stored aggregate C from decreasing. The mixer 9 is constituted by a two-shaft puggle mixer or the like, and has the discharge ports 7, 7.
Aggregates C of various particle sizes B1 to B4, which are input from .
Both are stirred and mixed to produce an asphalt mixture, and then this asphalt mixture is dropped onto a loading device 27 from a discharge hopper 26 provided at one end. The mixer 9 is housed in a recess dug in the ground, as shown in FIG. The asphalt supply device 10 includes a molten asphalt tank 28 that stores molten asphalt E, and an oil heater 29 that is connected to the molten asphalt tank 28 and heats or keeps the molten asphalt E in the molten asphalt tank 28 warm.
and a spray 30 that sprays the molten asphalt E from the molten asphalt tank 28 into the mixer 9. In addition, what is indicated by the reference numeral 31 in the figure is a dust collector, which has an exhaust fan 32 and an exhaust pipe 33 connected to the exhaust fan 32, and is communicated with the drying device 3 through a ventilation pipe 34. .

Next, the production of asphalt mixture according to the present invention will be explained.

Among the raw aggregates B stored in the stock devices 1, 1, . 3 into the rotating drum 15.

At this time, the drying device 3 is driven by the rotation of the rotary drum 15 and the hot air heated by the heating burner 16 being fed into the rotary drum 15. Single particle size raw aggregate B
(B1) is heated and dried by the hot air until it reaches a predetermined temperature and a predetermined moisture content. The heated and dried aggregate C (B1) is transferred to the top size screen 17 and the lower chute 1 by the rotation of the rotating drum 15.
8 into the packets of the packet conveyor. Heated and dried aggregate C (B
1) is conveyed upward by driving the packet conveyor, and is then dropped from the upper chute 20 onto the belt conveyor 21 in the upper space 19 of the hot aggregate silo 6. is thrown into one end of the chute 5 by the drive of. Here, in response to the raw aggregate B having a grain size of 2 being cut out from the stocking device 1, the slide gate 23 of the storage chamber D1 in which the aggregate C having a grain size of B1 is to be stored is opened, and the chute 5 is opened. Since the other end is opposed to the input port 22 of the storage chamber D1 in advance by remote control, the heated and dried aggregate C (injected into one end of the chute 5) B1) is chute 5 and input port 22
It is put into a predetermined storage chamber D1 through the storage chamber D1 and stored therein. When the desired amount of storage is completed, the raw aggregate B (B1) is cut out from the stocking device 1, the conveying device 2 is driven, the drying device 3 is driven, the conveying device 4 is driven, and the belt conveyor 2 is driven.
After sequentially stopping the driving of 1, the open slide gate 23 is closed and the raw aggregate B (B1) of one particle size is removed.
Complete heating, drying and storage. Note that the above-mentioned stopping order of each device is just an example, and the point is that the stock device 1
Each device may be stopped when storage of the final raw aggregate B cut from the raw material is completely completed. On the other hand, while the drying device 3 is being driven, the dust collector 31
The rotary drum 15 is also driven to collect dust generated when raw aggregate B is heated and dried within the rotating drum 15. Next, in order to heat and dry raw aggregate B of another particle size and store it in the hot aggregate silo 6, open the discharge port 11 of the stock device 11 in which the raw aggregate B of the corresponding particle size is stored. At the same time, the slide gate 23 of the storage chamber D corresponding to the particle size is opened, and the other end of the chute 5 is opposed to the input port 22 of the predetermined storage chamber D, and then each device is driven. Bye. Thereby, the raw aggregate B of each particle size can be heated, dried, and stored in the same manner as described above. Furthermore, by controlling the time of each device, the particle size can be switched without stopping each device.

Then, each aggregate C (B1 to B4
) is stored while preventing heat radiation to the outside air by the heat insulating material 25 on the outer wall of the hot aggregate silo 6. The heated and dried aggregates C (B1 to B4) stored in this way are
Discharge ports 7, 7 of the hot aggregate die port 6 as necessary.
By opening the . . . , the particles are charged into the weighing device 8 for each particle size and weighed, and are fed into the mixer 9 to be produced into a desired mixture, and are further transferred to the melted asphalt tank by the spray 30. Together with the dissolved asphalt E sprinkled from 28 into the mixer 9, it is stirred and mixed by the mixer 9 to form an asphalt mixture.

The generated asphalt mixture is then discharged from the mixer 9.
While being fed from the output hopper 26 to the loading device 27,
The product is loaded onto a truck or the like by this loading device 27 and shipped. The above series of flows of raw aggregate B and heated and dried aggregate C are shown by arrows A in FIG. In the above embodiments, the cross-sectional shape of the hot aggregate silo 6 is circular, but it may also be polygonal.
... can be adopted in various ways, such as a corrugated silo type or a stock art type.

As explained above, the present invention includes a single drying device that heats and dries various aggregates for each particle size, and a single drying device that heats and dries various aggregates for each particle size that is conveyed from this single drying device. The silo is equipped with a hot aggregate silo that stores the aggregate in a predetermined storage chamber through a chute, so the particle size of the aggregate in the storage chamber is the same as that of the aggregate fed into the hot aggregate silo. Furthermore, aggregates with different particle sizes have never been mixed together while passing through each device, and therefore aggregates stored in the hot aggregate silo have different particle sizes. Therefore, the quality of the composite material produced can be stabilized.

In addition, since heating, drying, and storage for each particle size can be performed by controlling the time of a single drying device and its auxiliary devices, continuous operation of each device is possible, saving energy and
This is highly advantageous in terms of reducing the cost and installation area of asphalt plants. Furthermore, aggregate heated and dried in hot aggregate silos can be stored for long periods of time without causing a drop in temperature. By driving only the equipment related to the discharge of asphalt and the production of asphalt mixture, noise pollution can be prevented and shipping at night can be made possible. Further, since the upper chute of the conveying device projects through the upper space of the hot aggregate silo, heat and dust within the hot aggregate silo are not radiated into the atmosphere from that portion. Furthermore, the plurality of storage chambers are arranged in a ring, and the horizontally rotating chute is configured to rotate horizontally within the hot aggregate silo to feed dry aggregate into each storage chamber. Dry aggregate can be added accurately to any storage room. Furthermore, since the mixer is housed in a recess dug into the ground, the height of the hot aggregate silo installed above the ground can be lowered, increasing its strength and stability. This has the advantage that maintenance and inspection of the equipment and mixer is easy. According to the present invention, it is possible to provide a heated aggregate storage type asphalt plant that can achieve the various effects described above.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partial sectional view showing the entire device, and FIG. 2 is a sectional view taken along the line - in FIG. 1. 1...Stock device, 2...Transfer device,
3... Drying device, 4... Conveying device, 5...
... Chute, 6 ... Hot aggregate silo, 7.
...Discharge port, 8...Measuring device, 9...
... mixer, 10 ... asphalt supply device, B ... raw aggregate, Bl, B. ,B3,B4...
... Particle size, C ... Aggregate (heated and dried), Dl, D2, D3, D4 ... Storage room, E.
...Dissolved asphalt plant.

Claims (1)

[Claims] 1 Multiple stock devices 1 that store raw aggregate B according to particle size
, a first conveying device 2 for conveying the raw aggregate B discharged from the discharge port 11 of these stocking devices 1, and a first conveying device 2 for conveying the raw aggregate B of single grain size conveyed by this conveying device 2. A drying device 3 that heats and dries the drying device 3, a second conveying device 4 that conveys the aggregate C of single particle size heated and dried by this drying device 3, and an upper portion provided above the second conveying device 4. The chute 20 is erected on the ground with a penetrating projection into the upper space 19, and has a plurality of storage chambers D_1 and D_2 arranged in an annular manner and radially partitioned by partition walls 24. There is an input port 22 at the top of chambers D_1 and D_2.
In addition, a hot aggregate silo 6 is provided with a discharge port 7 at the bottom of each storage chamber D_1, D_2, and the above-mentioned 2. Dry aggregate C received from the upper chute 20 of the conveying device 4 is transferred from each input port 22 to each storage chamber D_1, D.
Chute 5 to feed into _2 and hot aggregate silo 6 mentioned above
A measuring device 8 for measuring the dry aggregate C discharged from the outlet 7 of each storage room D_1, D_2 provided below, a measuring device 10 for dissolving asphalt, and a device formed on the ground below the measuring device 8. A mixer 9 is housed in a recess and mixes the dry aggregate C received from the measuring device 8 with the molten asphalt received from the asphalt metering and feeding device 10, and A heated aggregate storage type asphalt plant characterized by comprising a loading device 27 for loading materials onto a truck or the like.