JP2000186307A - Manufacturing apparatus of asphalt material using recycled aggregate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing apparatus of an asphalt material using recycled aggregate of which the durable period of a bag filter is long and which can remove asphalt dust efficiently. SOLUTION: This apparatus has an aggregate charging part 7, a recycled aggregate charging part 18, a stone dust charging part 24 and an asphalt charging part 34. It has a mixer 41 mixing aggregate S, recycled aggregate R, stone dust and asphalt. It is equipped with a first drier 2, a second drier 13, a first screen 4 and a bag filter 63 collecting dust produced in the mixer 41. On the upstream side of the bag filter 63, asphalt dust removing filters 71 and 71A filled with aggregate are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt material manufacturing apparatus using recycled aggregate, and more particularly, to a recycled aggregate which does not shorten the useful life of a bag filter even when recycled aggregate is used. The present invention relates to an asphalt material manufacturing apparatus.

[0002]

Conventionally, an apparatus for producing asphalt material constituting an asphalt roadbed or the like is shown in FIG.
As shown in FIG. 3, aggregate hoppers 1, 1a, and 1b containing three types of aggregates S having different particle sizes such as sand and crushed stone, and withdrawal of aggregates S cut out from the aggregate hoppers 1, 1a, and 1b. A conveyor 1A, a loading conveyor 2, a first dryer 2 provided with a burner 2A for heating and drying the aggregate S, a receiving port 3A for carrying the aggregate S heated and dried by the first dryer 2, and a discharge chute. A hot elevator 3 having a 3B, and a comb-shaped first screen 4 for sorting aggregates S discharged from a discharge chute 3B of the hot elevator 3
And the aggregates S1. S
Hot bins 5,5A, 5B for storing 2,3 according to particle size
And aggregates S1, S taken out of the 5, 5A, 5B
2 and an aggregate weighing hopper 6 for weighing S3. Also, a recycled aggregate hopper 11 for storing the recycled aggregate R, and a recycled aggregate input conveyor 12 for transporting the recycled aggregate R cut out from the recycled aggregate hopper 11
A second dryer 13 for heating and drying the recycled aggregate R supplied by the recycled aggregate input conveyor 12, a receiving port 14A for carrying the recycled aggregate R heated and dried by the second dryer 13, and a discharge port. A bucket elevator 14 having a chute 14B, a surge bin 15 for storing the recycled aggregate R discharged from the bucket elevator 14, and a recycled aggregate measuring hopper 17 located at the base end side and the distal end side are disposed at the surge bin 15. The recycled aggregate input screw conveyor 16 forms a recycled aggregate input section 18. A stone powder silo 21 for storing stone powder, a conveyor 21A for charging the stone powder in the stone powder silo 21, a stone powder bucket elevator 22 having a receiving port 22A for carrying the stone powder and a discharge chute 22B, A stone powder input section 24 is constituted by the stone powder measuring screw conveyor 23 as a mechanism. Further, the viscous asphalt is stored in an asphalt tank 31, is pumped up by a pump 32, is measured by a predetermined amount by a measuring device 33, and the asphalt charging section 34 is controlled by the asphalt tank 31, the pump 32 and the measuring device 33. It is configured. The recycled aggregate hopper
11 is provided with a recycled aggregate production apparatus in the vicinity of FIG.
As shown in the figure, this recycled aggregate manufacturing apparatus 51 is for recycling asphalt roadbed material 52,
52, a first charging conveyor 54 for transporting the roadbed material from the hopper 53 to the crusher 55, a second charging conveyor 56 and a return conveyor 57 for transferring the pulverized material crushed by the crusher 55. And a comb-shaped second screen 58 for sorting the pulverized matter discharged from the second charging conveyor 56,
And a carry-out conveyor 59 for discharging the sorted pulverized materials.

[0003] The aggregate S supplied from the aggregate weighing hopper 6 and the recycled aggregate R supplied from the recycled aggregate weighing hopper 18 are mixed in a mixer 41 together with stone powder and viscous asphalt to form an asphalt material. At this time, the first dryer 2 and the second dryer 1
3. In the first screen 4 and the mixer 41, a gas flow G containing dust such as fine dust is generated. Then, the dust in the gas flow G is guided in the duct 61 by the induction fan 62 and the like, and is collected and removed by the bag filter 63. Then, only the purified air is discharged from the chimney 64 to the outside environment. You.

In the asphalt material manufacturing apparatus as described above, it has been established that asphalt roadbed is used as recycled aggregate from the viewpoint of effective use of resources and the like. Asphalt dust generated when mixing with the mixer 41 is also included in the dust. When the asphalt dust passes through the bag filter 63, it adheres to the bag filter 63, so that the bag filter 63 becomes sticky and is likely to be clogged, resulting in a problem that the service life thereof is extremely short. Therefore, it is conceivable to remove asphalt dust from the dust in the middle of the bag filter 63, but it has not been possible conventionally to selectively remove only asphalt dust. In addition, if water vapor can be removed from a gas stream containing dust, a bag filter
It is desirable to further reduce the burden of 63.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an asphalt material producing apparatus using recycled aggregate which has a long service life of a bag filter and can efficiently remove asphalt dust. Aim.

[0006]

As a result of intensive studies in view of the above-mentioned objects, the present inventors have found that the aggregate used for the asphalt material, particularly the particle size to some extent, is located upstream of the bag filter of the asphalt material manufacturing apparatus. If a layer filled with pebbles or gravel is formed and this is used as an asphalt dust removal filter, asphalt will be removed by agglomeration and adhesion to the surface of this aggregate, greatly reducing the load on the bag filter. I found that I can do it. In addition, it has been found that by connecting a plurality of asphalt dust removal filters in series, moisture such as water vapor can also be removed. The present invention has been made based on these.

[0007] The asphalt material manufacturing apparatus according to claim 1 of the present invention comprises an aggregate hopper for storing the aggregate, a first dryer for heating and drying the aggregate cut out from the aggregate hopper, and the first dryer. A hot elevator that carries aggregates heated and dried by a dryer, a comb-shaped screen that sorts the aggregates discharged from the hot elevator, and a hot bin that stores the aggregates sorted by this screen according to particle size, An aggregate loading section having an aggregate weighing hopper for weighing the aggregate removed from the hot bin, a recycled aggregate hopper for storing the recycled aggregate, and heating the recycled aggregate cut out from the recycled aggregate hopper A second dryer for drying;
A bucket elevator for carrying the regenerated aggregate heated and dried by the second dryer, a surge bin for storing the regenerated aggregate discharged from the bucket elevator, a regenerative bone positioned at the base end side and at the distal end side Asphalt having a recycled aggregate input section having a recycled aggregate input conveyor in which a material weighing hopper is disposed, a stone powder input section having a stone powder measuring mechanism for measuring stone powder, an asphalt tank containing asphalt, and an asphalt measuring device A charging unit, a mixer for mixing the aggregate supplied from the aggregate weighing hopper, the recycled aggregate supplied from the recycled aggregate weighing hopper, stone powder, and asphalt; the first dryer and the second dryer A bag filter for collecting dust generated by the screen and the mixer, and an upstream side of the bag filter. It is obtained by arranging the asphalt dust removal filter filled with aggregate.

[0008] In the asphalt material producing apparatus according to the second aspect, in the first aspect, two or more cooling filters are connected in series.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the asphalt material producing apparatus of the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows an asphalt material manufacturing apparatus according to a first embodiment of the present invention. This asphalt material manufacturing apparatus has the same configuration as that of the asphalt dust removal filter 71, 71A provided in front (upstream side) of the bag filter 63.
Since it has the same configuration as that of the conventional device shown in FIG. 4 described above, the same components are denoted by the same reference numerals and detailed description thereof will be omitted. In the present specification, the asphalt material refers to a material that is laid on an asphalt roadbed or the like obtained by mixing a viscous asphalt and an aggregate. The terms “upstream” and “downstream” are based on the flow direction of the gas flow G containing dust.

As shown in FIG. 2, the cooling filters 71 and 71A have a structure in which an aggregate 73 such as pebbles and gravel is filled in a tubular body 72 provided in the middle of a pipe 61. As the aggregate 73, sand, which has a large pressure loss and hinders the flow of the dust-containing gas stream G, is used. Pebble or gravel having a certain particle size is used. Here, in consideration of the removal efficiency of the asphalt dust, recycled aggregate is not usually used here.

The operation of the above configuration will be described. First, in the aggregate input section 7, aggregate hoppers 1, 1 containing three types of aggregates S having different particle sizes such as sand and crushed stones are stored.
Aggregate S cut out from a and 1b is fed to the first dryer 2 by the charging conveyor 2, where it is 200 to 30.
It is dried at a temperature of about 0 ° C. This dried aggregate S
Is supplied from the receiving port 3A to the hot elevator 3 and sent upward, dropped from the discharge chute 3B onto the first comb-shaped screen 4, and sorted by its particle size. The sorted aggregate S is divided into hot bottles 5, 5A,
5B, is supplied to the aggregate weighing hopper 6 by a required amount, and is supplied to the mixer 41 from here. Next, in the recycled aggregate input section 18, the recycled aggregate R cut out from the recycled aggregate hopper 11 is fed to the second dryer 13 by the recycled aggregate input conveyor 12 and dried by heating. Is supplied to the bucket elevator 14 and sent upward, and is temporarily stored in the surge bin 15 from the discharge chute 14B. Then, it is sent from the surge bin 15 to the recycled aggregate feeding screw conveyor 16, supplied to the recycled aggregate measuring hopper 17, and then fed into the mixer 41. In the stone powder input section 24, the stone powder stored in the stone powder silo 21 is supplied to the stone powder elevator 22 from the receiving port 22A, sent upward, and discharged from the discharge chute 22B to the stone powder measuring screw conveyor 23,
It is supplied to the mixer 41 while being measured. Further, in the asphalt charging section 34, the viscous asphalt stored in the asphalt tank 31 is heated and held at about 180 to 200 ° C., is pumped up by the pump 32 while keeping the liquid, and is measured by the measuring device 33 by a predetermined amount. It is sprayed into the mixer 41. Then, the aggregate S supplied from the aggregate weighing hopper 6 and the recycled aggregate R supplied from the recycled aggregate weighing hopper 18 are mixed with the stone powder and the viscous asphalt by the mixer 41 at a temperature of about 160 to 180 ° C. Mixed,
It is discharged as asphalt material and loaded on trucks and other cargo-handling vehicles for transport.

On the other hand, a first dryer 2 and a second dryer
13, dust such as fine dust is generated in the first screen 4 and the mixer 41. The gas stream G containing this dust is
The first and second dryers 2 and 13 and the mixer 41 are in a high temperature state due to heat, but the dust generated here is provided with a pipe 61, and an induction fan 62 is provided in the pipe 61. As a result, it is guided in the pipeline 61 and reaches the asphalt dust removal filter 71. Since the asphalt dust removal filter 71 is filled with the aggregate 73, the amount of heat of the dust is absorbed by the specific heat of the aggregate 73. Therefore, if a sufficient amount of the aggregate 73 with respect to the flow rate of the gas flow G is filled in the asphalt dust removal filter 71, the gas flow G containing dust is preferably reduced to 120 to 15%.
It can be rapidly cooled to about 0 ° C. At this time, since the temperature of the aggregate 73 is lower than that of the dust, the asphalt dust aggregates on the surface of the aggregate 73. Thereby, asphalt dust can be removed from the dust. Also, some other dust is removed here to some extent. The gas flow G containing the dust from which the asphalt dust has been removed in this way
Arrives at the bag filter 63, where other dust and the like are collected and removed, and released to the external environment. Since the asphalt dust is removed from the dust that has passed through the asphalt dust removal filter 71 in the dust cleaning process as described above, the asphalt dust adheres to the bag filter 63 and the bag filter 63 may be clogged. , It is not sticky. In addition, by connecting two asphalt dust removal filters 71 and 71A as in the present embodiment, the first asphalt dust removal filter is provided.
The asphalt dust in the dust is mainly removed by setting the cooling temperature at 71 to about 120 to 150 ° C, and the cooling temperature at the next asphalt dust removing filter 71A is set to 100 ° C.
In the following, water vapor in the gas stream G containing dust can be removed as water. Thus, the load on the bag filter 63 can be significantly reduced.

The asphalt dust removal filter 7
If the aggregate 73 in 1,71A becomes warm and the cooling effect cannot be obtained sufficiently and the effect of removing asphalt dust cannot be expected, the operation of the device is stopped and the aggregate 73 is cooled to cool the asphalt dust. Can be reproduced. When the asphalt dust has sufficiently adhered to the surface of the aggregate 73, the asphalt dust removal filters 71, 71A
Aggregate S as raw material of asphalt material
May be put into the mixer 41 as a part of the process. The asphalt dust removal filters 71 and 71A have a new aggregate 73.
Should be filled.

In this embodiment, the recycled aggregate hopper is also used.
A recycled aggregate manufacturing apparatus is provided near 11. This recycled aggregate manufacturing apparatus is the same as that shown in FIG.

As described in detail above, the apparatus for manufacturing asphalt material of the present embodiment includes the aggregate hoppers 1, 1 for storing the aggregate S.
a, 1b and the aggregate hopper, the aggregate hoppers 1, 1a, 1b
Dryer 2 for heating and drying the aggregate S cut out from the above, a hot elevator 3 for carrying the aggregate S heated and dried by the first dryer 2, and an aggregate discharged from the hot elevator 3 The comb-shaped screen 4 for sorting S, the hot bins 5A, 5B, 5C for storing the aggregates S sorted by the screen 4 according to particle size, and the aggregate S taken out from the hot bins 5A, 5B, 5C are weighed. Aggregate input section 7 having an aggregate weighing hopper 6 to be recycled, a recycled aggregate hopper 11 for storing the recycled aggregate R, and a second heating and drying of the recycled aggregate R cut out from the recycled aggregate hopper 11 Dryer 13, a bucket elevator 14 for carrying the recycled aggregate R heated and dried by the second dryer 13, and a surge bin 15 for storing the recycled aggregate R discharged from the bucket elevator 14. Recycled aggregate loading portion and a recycled aggregate feed conveyor 16 which play distally aggregate weighing hopper 17 are arranged with the base end side is positioned in the surge bin 15
18, a stone powder input section 24 having a stone powder measuring screw conveyor 23 as a stone powder measuring mechanism for measuring stone powder, an asphalt tank 31 containing asphalt, and an asphalt measuring device
33, an aggregate S supplied from the aggregate weighing hopper 6, and the recycled aggregate weighing hopper
A mixer 41 for mixing the recycled aggregate R, the stone powder, and the asphalt supplied from 17, and collects dust generated in the first dryer 2, the second dryer 13, the first screen 4, and the mixer 41. Since the asphalt dust removal filters 71 and 71A filled with the aggregate 73 are provided on the upstream side of the bag filter 63, the asphalt dust can be captured in front of the bag filter 63. As a result, the bag filter 63 is not clogged with asphalt dust. In particular, in this embodiment, the asphalt dust removal filter 71,
After two asphalt dusts are removed by the first asphalt dust removal filter 71, two
Since water can be removed by the asphalt dust removal filter 71A, the load on the bag filter 63 can be further reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment has the same configuration as the above-described first embodiment except that the asphalt dust removal filter 71 is different. This asphalt dust removal filter 71
Has a structure in which a granular aggregate 82 is filled in a cylindrical body 81 as shown in FIG. 3, and a lower end of the cylindrical body 81 is a lower end opening 83 as a discharge port with a reduced diameter. The upper end of the cylindrical body 81 is an upper opening 84 serving as a supply port. The gas flow G containing dust flows from the lower side of the cylindrical body 81 to the upper side, and the lower end opening 83 allows the gas flow G to flow. By discharging the aggregate 82 and supplying the aggregate 82 from the upper end opening 84, the aggregate 82 moves downward from above.

By adopting such a configuration, the aggregate 82 to which asphalt dust is sufficiently fixed from the gas stream G containing dust is gradually dropped and recovered from the lower end opening 83 of the tubular body 81, and is collected. Mixer as raw material
On the other hand, the new aggregate 82 is supplied from the upper end opening 84 while the gas flow G is continuously cooled, and the asphalt dust can be efficiently removed.

Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, two asphalt dust removal filters 71 and 71A are provided in series, but one filter may be provided, and a filter 71A may be provided downstream of the bag filter 63 as a filter for removing water vapor. . In addition, bag filter 63 as stone powder
The dust collected by the above method can be used alone or as a mixture.

[0020]

According to the first aspect of the present invention, there is provided an asphalt material manufacturing apparatus, comprising: an aggregate hopper for storing aggregate; a first dryer for heating and drying the aggregate cut out from the aggregate hopper; A hot elevator for carrying aggregates heated and dried by the first dryer, a comb-shaped screen for sorting the aggregates discharged from the hot elevator, and a hot bin for storing the aggregates sorted by the screen according to particle size An aggregate input section having an aggregate weighing hopper for weighing the aggregate removed from the hot bin; a recycled aggregate hopper for storing the recycled aggregate; and a recycled aggregate cut out from the recycled aggregate hopper. A second dryer for heating and drying, a bucket elevator for carrying the recycled aggregate heated and dried by the second dryer, and a bucket elevator discharged from the bucket elevator. And a surge bin for storing the raw bone material,
A recycled aggregate input section having a recycled aggregate input conveyor in which a proximal end side is located in the surge bin and a recycled aggregate measuring hopper is disposed on the distal side, and a stone powder input section having a stone powder measuring mechanism for measuring stone powder, An asphalt charging section having an asphalt tank containing an asphalt and an asphalt measuring device, and mixing of aggregate supplied from the aggregate weighing hopper, recycled aggregate supplied from the recycled aggregate weighing hopper, stone powder, and asphalt. And a bag filter for collecting dust generated by the first dryer, the second dryer, the screen, and the mixer, and an asphalt dust removal filter filled with aggregate is provided upstream of the bag filter. As a result, asphalt dust can be captured in front of the bag filter. It is made so as not to be clogged by belt dust.

Further, in the asphalt material manufacturing apparatus according to claim 2, since two or more cooling filters are connected in series, asphalt dust is removed by the first asphalt dust removal filter. rear,
Since water can be removed by the second and subsequent asphalt dust removal filters, the load on the bag filter can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an asphalt material manufacturing apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a cooling filter used in the embodiment.

FIG. 3 is a sectional view showing a cooling filter used in an asphalt material manufacturing apparatus according to a second embodiment of the present invention.

FIG. 4 is a schematic view showing a conventional asphalt material manufacturing apparatus.

FIG. 5 is a schematic diagram showing a recycled aggregate manufacturing apparatus used in a conventional asphalt material manufacturing apparatus.

[Explanation of symbols]

 Reference Signs List 1, 1a, 1b Aggregate hopper 2 First dryer 3 Hot elevator 4 Screen 5A, 5B, 5C hot bin 6 Aggregate weighing hopper 7 Aggregate input section 11 Recycled aggregate hopper 13 Second dryer 14 Bucket elevator 15 Surge bin 16 Recycled Aggregate Conveyor 17 Recycled Aggregate Measuring Hopper 18 Recycled Aggregate Input Unit 23 Stone Powder Measuring Screw Conveyor (Stone Flour Metering Mechanism) 24 Stone Powder Input Unit 31 Asphalt Tank 33 Asphalt Meter 34 Asphalt Input Unit 41 Mixer 63 Bag Filter 71, 71A Asphalt dust removal filter 73 Aggregate S Aggregate R Recycled aggregate G Gas flow containing dust

Claims (2)

[Claims] 1. An aggregate hopper for storing aggregates, a first dryer for heating and drying the aggregate cut out from the aggregate hopper, and carrying the aggregate heated and dried by the first dryer. A hot elevator, a comb-shaped screen for sorting aggregates discharged from the hot elevator, a hot bin for storing the aggregates sorted by the screen according to particle size, and a bone for measuring the aggregates taken out from the hot bins An aggregate input section having an aggregate weighing hopper; a recycled aggregate hopper for storing the recycled aggregate; a second dryer for heating and drying the recycled aggregate cut out from the recycled aggregate hopper; A bucket elevator that carries the recycled aggregate heated and dried by the dryer, and a surge bin that stores the recycled aggregate discharged from the bucket elevator,
A recycled aggregate input section having a recycled aggregate input conveyor in which a proximal end side is located in the surge bin and a recycled aggregate measuring hopper is disposed on the distal side, and a stone powder input section having a stone powder measuring mechanism for measuring stone powder, An asphalt charging section having an asphalt tank containing an asphalt and an asphalt measuring device, and mixing of aggregate supplied from the aggregate weighing hopper, recycled aggregate supplied from the recycled aggregate weighing hopper, stone powder, and asphalt. And a bag filter for collecting dust generated by the first dryer, the second dryer, the screen, and the mixer, and an asphalt dust removal filter filled with aggregate is provided upstream of the bag filter. An asphalt material manufacturing apparatus using recycled aggregate, characterized in that it is provided. 2. The asphalt material producing apparatus using recycled aggregate according to claim 1, wherein two or more cooling filters are connected in series.