JPS6046204B2 - Asphalt aggregate storage silo - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage silo that stores heated and dried asphalt aggregates of a plurality of particle sizes by keeping them warm or heating them and storing them according to particle size.

Conventionally, storage silos installed in asphalt plants that produce asphalt store asphalt aggregates of multiple types of particle sizes that have been heated and dried in advance, and then weigh and weigh the aggregates as needed. It is known that the gas is discharged. From the viewpoint of productivity, this storage container is required to be able to store a large amount of aggregate, and it is also required to be able to store it for a long time while maintaining the temperature and degree of dryness of the aggregate. The outer wall of the storage silo is provided with various heat retaining means and heating means to prevent the heat of the stored aggregate from being radiated to the outside air through the outer wall of the storage silo. Designed to prevent temperature drop. However, the temperature of the aggregate is not necessarily reduced only by the heat of the aggregate being radiated to the outside air through the outer wall of the storage silo, but also by the air flow in the upper space of the storage silo. Heat can also be dissipated by convection.

Moreover, this space increases as the storage amount decreases due to consumption of aggregate. The heat radiated from the aggregate to the air is also one of the causes of a decrease in the temperature of the aggregate. Therefore, in order to reliably prevent the temperature of the aggregate from decreasing and improve the storage capacity of the storage silo, it is necessary to also prevent heat radiation to the air within the space. The present invention has been made in view of the above-mentioned conventional circumstances, and includes a heating ventilation pipe equipped with a blower, a heater, and a switching damper in series in a storage silo, with the switching damper on the intake side and both ends connected to the storage silo. By connecting the switching damper to the dust collecting ventilation pipe of the dust collector, the heat of the aggregate can be prevented from being dissipated into the air, and the aggregate can be cooled. In addition to preventing temperature drops as much as possible, it also protects the blower, heater, and heater from dust.
Another object of the present invention is to provide an asphalt aggregate storage silo with a simple piping system. The present invention will be explained below based on an embodiment shown in the drawings.

The reference numeral 1 in the drawing is an asphalt plant, and this asphalt plant 1 includes a dryer 2 that dries and heats aggregate A to a predetermined temperature, and a plurality of types of aggregates that are dried and heated by this dryer 2. A storage silo 3 stores aggregates A-A2 of different particle sizes, and the heated and dried aggregate A discharged from the dryer 2 is transported above the storage silo 3 and thrown into the storage silo 3. and a mixer 5 that stirs and mixes mixed aggregate F consisting of aggregates A1 to A1 of various particle sizes discharged from the storage silo 3 with asphalt B to produce an asphalt mixture.
It is roughly composed of. The dryer 2 includes a rotating drum 6, an aggregate input port 7 provided at one end of the rotating drum 6, an aggregate discharge hopper 8 and a heating burner 9 provided at the other end of the rotating drum 6. It is configured,
Further, the discharge hopper 8 is connected to the input means 4. The storage silo 3 has an aggregate input port 1 at its upper part.
1 is provided, and this input port 11 is provided with a slide gate 12 that opens and closes the input port 11.

In addition, aggregates A1 to A of various particle sizes are heated and dried inside.
A plurality of storage chambers C1 to C3 are provided for storing 3 according to particle size, and funnel-shaped discharge ports 13, 13, and 13 are formed in the lower part of each of the storage chambers C1 to C3. Opening and closing lids 14 and 14 that open and close 13 and 13
・14 is installed. Further, a rotary chute 15 is rotatably attached above the storage silo 3, and an opening at one end of the rotary chute 15 faces the input port 11, and an opening at the other end faces the storage chambers C1 to 11. C
3 and facing any one of the upper openings. The rotary chute 15 is rotated in accordance with the particle size of the aggregates A1 to A3 input from the input port 11, and is configured to guide the aggregates A1 to A3 to predetermined storage chambers C1 to C3. There is. On the other hand, on the outside above the storage silo 3, a switching damper 16, a blower 17, and a heater 18 are installed.
are connected in series by a ventilation pipe 19, and the heating means 20 is arranged so that one end of the ventilation pipe 19 penetrates the upper wall of the storage silo 3. A heating circuit which is fixed and whose other end penetrates and is fixed to the side wall of the storage silo to communicate with the space D above the storage silo 3, thereby heating the air in the space D. A route is configured. This heating means 20 is used to feed the aggregates A, Al, etc. into the storage silo 3.
While the silo is being turned on, communication between the blower 17 and the inside of the storage silo 3 is cut off by the switching damper 16, and at the same time, driving of the blower 17 and heating by the heater 18 are stopped. There is. Furthermore, weighing hoppers 21, 21, and 21 are disposed below and outside the storage silo 3, facing each of the opening/closing lids 14, 14, and 14, respectively. Further, a heating device E made of hot oil or hot wire is embedded in the side wall of the storage silo 3.
The heating means 20 includes a control device (not shown) that detects the temperature of the circulating air, compares the detected temperature with a set temperature, and drives and stops the heater 18 based on the result. ) may also be provided. The feeding means 4 has a bucket conveyor 7a (not shown) disposed therein, and a bucket conveyor 7a (not shown) is disposed at the bottom thereof, and the aggregate A, Al, which is dropped from the discharge hopper 8, is fed into the packets of the packet conveyor. A lower chute 22 is provided at the top of the charging means 4 to input the J aggregates A, Al to A3 discharged from the packet conveyor via a belt conveyor 23 disposed externally above the storage silo 3. An upper chute 24 for feeding into the mouth 11 is provided.

An asphalt spray 25 for spraying asphalt B into the mixer 5 is arranged in the mixer 5, and the asphalt B sprayed from this asphalt spray 25
and the mixed aggregate F fed into the mixer 5 by the belt conveyor 26 are stirred and mixed to produce an asphalt mixture, and the produced asphalt mixture is delivered to a truck from a discharge port (not shown). It is designed to be discharged to other sources.

What is indicated by the reference numeral 27 is a dust collector, and this dust collector 27
has a dust collector 28 and an exhaust fan 29, and the intake side of the dust collector 28 is communicated with the switching damper 16 and the dryer 2 arranged on the intake side of the ventilation pipe 19 through ventilation pipes 30 and 31.

While the aggregates A, Al to A3 are being charged into the storage silo 3, the dust collector 27 is switched to the storage silo 3 by switching the switching damper 16.
The dust inside the dryer 2 is collected through the ventilation pipe 19, and the dust inside the dryer 2 is collected while the dryer 2 is being operated.
Next, the operation of this invention will be explained.

First, the operation for heating and drying the aggregate A and then storing it in the storage silo 3 will be explained.

The above-described operations in this embodiment are performed in the same manner for each particle size of the aggregate A, so only one particle size of the aggregate A1 will be described. Aggregate A1 is fed from the input port 7 into the rotating drum 6 of the dryer 2, which is driven by rotating the rotating drum 6 and blowing hot air heated by a heating burner 9 into the rotating drum 6. When you put it in,
This aggregate A1 is transferred to the dryer 2 by the rotation of the rotating drum 6.
While being transferred to the discharge hopper 8 side, it is dried and dried by hot air.
It is heated to a predetermined temperature and is dropped from the discharge hopper 8 through the lower chute 22 into the packet of the packet elevator.

The aggregate A1 is then transported upward by the packet elevator and dropped onto the belt conveyor 23 via the upper chute 24. , and the aggregate A1 is dropped into a predetermined storage chamber C1 via a rotary chute 15 facing the storage chamber C1 in which the aggregate A1 is to be stored. While the aggregate A1 is being stored, the heating means 20 is not driven at all, and the communication between the blower 17 and the space D of the storage silo 3 is controlled by switching the switching damper 16. Since it is shut off, there is no risk that dust generated by the storage operation will be sucked into the proar 17. And this dust is transferred to the switching damper 1.
6, the dust is sucked in by the suction operation of the dust collector 27, which is communicated with the space D, and is collected in the dust collector 28. The dust collecting operation in this dust collecting device 27 is as follows:
The same process is carried out through the ventilation pipe 31 for the dryer 2 where the aggregate A1 is heated and dried. Next, the operation of preventing cooling of the aggregates A1 to A1 stored in the storage silo 3 will be explained.

When the storage operation described above is completed, the input port 11 of the storage silo 3 is closed by the slide gate 12, and the switching operation of the switching damper 16 causes the space D inside the storage silo 3 to be connected to the blower 17. At the same time, communication between the dust collector 27 and the space D is cut off.

And heating device E buried in the side wall of storage silo 3
has been heated in advance, so
If the blower 17 and heater 18 are driven from this point on, an operation for preventing cooling of the aggregates A, Al to A3 will be performed. That is, while the air in the space D of the storage silo 3 is circulated by the blower 17 through the switching damper 16, the blower 17, and the heater 18, the temperature of the air in the space D of the storage silo 3 is raised by the heater 18 to a temperature slightly higher than that of the aggregate A, Al. Since it is heated to a high temperature, the heat of the aggregates A, Al to A3 is prevented from being radiated to the air, and the heating device E embedded in the side wall of the storage silo 3 prevents the heat from the aggregates A, Al to A3 from being radiated from the side wall. There are some methods that prevent heat radiation. Furthermore, as the stored aggregates A, Al to A3 are discharged to produce asphalt mixture, the space D of the storage silo 3 increases, but the air in that space is Since the air is heated and circulated uniformly by 20, the aggregate A, Al
~A3 is never cooled. In the above-mentioned embodiment, as a device for heating and drying the aggregates A, Al to A3 and storing them in the storage silo 3, a single dryer 2 is used to heat and dry aggregates A1 of a single particle size. In addition, the rotary chute 15 guides the aggregates to a predetermined storage chamber C1, and the same process is performed for aggregates A2 and A3 of other particle sizes, but this is only an example. Various other thermal drying and storage devices may also be used.

Further, the installation position of the heating means 20 is not limited to that shown in the above-mentioned embodiments, but can be changed as appropriate. As explained above, the present invention provides a storage silo with a heating ventilation pipe equipped with a blower, a heater, and a switching damper in series, with the switching damper disposed on the intake side, and both ends communicating with the upper part of the storage silo. The air in the space inside the storage silo is heated by a heater and the temperature of the air is maintained higher than the temperature of the aggregates stored, so that the air in the space is heated by the air inside the storage silo. It is possible to prevent the temperature of the aggregate from decreasing by preventing the heat from being radiated. In addition, even if the amount of air in the space increases due to the decrease in the amount of aggregate stored, the air can be heated uniformly and the difference in storage amount between each storage room can increase the amount of air inside the storage room. Even if there is a difference in the amount of air in the space located in the space, this air can be heated uniformly. It is possible to prevent a decrease in the temperature of the material and a temperature difference between the aggregates. In addition, the dust collection ventilation pipe of the dust collector is connected to the switching damper installed on the intake side of the heating ventilation pipe, and the intake side (upstream side) of the heater and blower is cut off by the switching damper. Because the dust is collected by the dust collector, no dust enters the blower, and since part of the intake side of the heating ventilation pipe is also used for dust collection, the distribution pipe The system is simplified. Therefore, according to the present invention, a large amount of heated and dried aggregate can be stored for a long time without causing a drop in temperature, and a piping system that can prevent troubles caused by dust in the heating device, especially the blower, is provided. A simple asphalt aggregate storage silo can be provided.

[Brief explanation of drawings]

The drawing is a partial vertical sectional view showing an asphalt plant equipped with an embodiment of the storage silo according to the present invention. 3...Storage silo, 16...Switching gunpa, 17...Blower, 18...Heater, 19
... Ventilation pipe, 20 ... Heating means, A...
... Aggregate, A1 ... Aggregate, ~ ... Aggregate, A3 ... Aggregate, C1 ... Storage room, C2
...Storage room, C3...Storage room, D...
...Space, E...Heating device.

Claims (1)

[Claims] 1. In a storage silo that stores heat-dried asphalt aggregates of multiple types of particle sizes while keeping them warm or heating them according to particle size, the storage silo is equipped with a heating ventilation pipe equipped with a blower, a heater, and a switching damper in series. Storage of aggregate for asphalt, characterized in that a damper is arranged on the intake side and both ends are connected to the upper part of the storage silo, and the dust collection ventilation pipe of the dust collection device of the switching damper is connected. silo.