JP3851684B2 - Asphalt plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an asphalt plant that produces an asphalt mixture that is a road pavement material, and more particularly to an asphalt plant that also produces a special asphalt mixture such as a drainage asphalt mixture.
[0002]
[Prior art]
Asphalt mixtures produced at asphalt plants are increasingly produced specially depending on their intended use. For example, water such as rainwater should not accumulate on the surface of paved roads on expressways. Therefore, a drainable asphalt mixture is also produced which allows water to penetrate the paved road and simultaneously drain the soaked water from the lower roadbed.
[0003]
As aggregates used in the drainage asphalt mixture, two types of aggregates, aggregates having a particle diameter of 5 to 13 mm (80 to 85% by weight) and sand (15 to 20% by weight), are exclusively used. And when manufacturing a drainage asphalt mixture, the 6th crushed stone (aggregate equivalent to a particle size of 5-13 mm) and sand stored in the aggregate hopper are simultaneously discharged to a predetermined amount, supplied to the dryer, and heated by the dryer. Aggregate is supplied to the vibration sieve of the plant body, and sieved according to particle size and stored in an aggregate storage bin.
[0004]
[Problems to be solved by the invention]
However, even if the No. 6 crushed stone is exclusively dispensed from the aggregate hopper, the particle size of the No. 6 crushed stone itself varies, and strictly speaking, there are cases where the particle size deviates from 5 to 13 mm. There are many cases in which 2.5 to 5 mm particle size corresponding to crushed stone is mixed.
[0005]
For this reason, No. 7 crushed stone is also stored and accumulated in a predetermined compartment of the aggregate storage bottle when the drainage asphalt mixture is manufactured. Since this No. 7 crushed stone is not used at the time of producing the drainage asphalt mixture, it is only accumulated in the bottle and eventually becomes full and overflows. Therefore, the shipment is interrupted and the 7th crushed stone is extracted. Therefore, the shipping capacity is reduced, and it takes time and effort to remove the waste. Further, the fuel for heating No. 7 crushed stone is wasted.
[0006]
In view of the above points, an object of the present invention is to provide an asphalt plant that can be operated efficiently without reducing the shipping capacity even during the production of a special asphalt mixture.
[0007]
[Means for Solving the Problems]
For the present invention to achieve the above object, cut out the seeds aggregate was stored in the aggregate hopper by a predetermined amount, lifting the plant body upper and dried by the dryer, sieved to various grain径別by vibrating sieve with bone In an asphalt plant that is stored in a material storage bin, a particle size adjusting sieve is installed on the upstream side of the dryer to screen and remove aggregates of the size equivalent to No. 7 crushed stone mixed in No. 6 crushed stone. However , when producing a drainage asphalt mixture, the aggregate of the size equivalent to the No. 7 crushed stone mixed in the No. 6 crushed stone before the dryer is sieved and removed by the above-mentioned particle size adjusting sieve, and the total amount is No. 6 and the particle size adjusted to fit the size range of crushed stone, is characterized in that it has the adjusted aggregate to feed the dryer.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to the asphalt plant of the present invention, when producing an asphalt mixture that uses only a specific type of aggregate, such as a drainage asphalt mixture, a particle size adjusting sieve in which the aggregate to be used is arranged on the upstream side of the dryer. The particle size of the asphalt mixture to be manufactured is adjusted so that the particle size is adjusted, and only the aggregate having a predetermined particle size is supplied to the dryer. An efficient operation is performed by using up the total amount of aggregate heat-treated by the dryer without waste.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
In the figure, 1a to 1d are aggregate hoppers for storing various aggregates for each type, 1a is No. 5 crushed stone (13 to 20mm), 1b is No. 6 crushed stone (5 to 13mm), and 1c is 7 A crushed stone (2.5 to 5 mm), and 1d is a hopper for storing sand.
[0011]
Variable speed feeders 2a to 2d are arranged below each aggregate hopper 1a to 1d so that the amount of aggregate cut out from each aggregate hopper 1a to 1d can be increased and decreased, and the type and composition of the asphalt mixture to be shipped The cutting speed of each of the variable speed feeders 2a to 2d according to the condition is stored in the plant operation panel, and the predetermined assemblage hopper is selected according to the type and composition of the asphalt mixture reserved for shipment by the shipment start command. A fixed amount of aggregate is cut out and supplied to the dryer 5 which is an aggregate heating device via the drawer conveyors 3 a to 3 d and the supply conveyor 4.
[0012]
Moreover, about the aggregate hopper 1b which stores No. 6 crushed stone, the flow path switching chute 6 which switches the flow of aggregate is arrange | positioned at the discharge side of the drawer conveyor 3b, and one discharge side of the flow path switching chute 6 is provided. Is provided with a direct conveying conveyor 7 for directly conveying the aggregate to the supply conveyor 4, and a particle size adjusting conveyor 9 for supplying a particle size adjusting sieve 8 for adjusting the particle size of the aggregate on the other discharge side. It is arranged.
[0013]
The particle size adjusting sieve 8 is provided with a sieve net for sieving the equivalent of No. 7 crushed stone (2.5-5 mm) in No. 6 crushed stone, and separates the aggregate of 2.5-5 mm particle size in No. 6 crushed stone. Like that. The particle size adjusting sieve 8 is provided with a conveyor 10 for transferring the sieved No. 6 crushed stone to the supply conveyor 4.
[0014]
The aggregate put into the dryer 5 is heated to a predetermined temperature by hot air from the burner 11, lifted up to the upper part of the plant body by the bucket elevator 12, and sieved by the vibrating sieve 13 to the aggregate storage bin 14. Stored by particle size.
[0015]
Based on the composition of the asphalt mixture to be manufactured, aggregates of various particle sizes are cumulatively weighed in the aggregate measuring tank 15 and put into the mixer 16, and the stone powder stored in the stone powder storage tank 18 through the stone powder elevator 17 A desired asphalt mixture is manufactured by adding the asphalt weighed in the stone powder measuring tank 19 and put into the mixer 16 and further adding a predetermined amount of asphalt measured in the asphalt measuring tank 20 to the aggregate in the mixer 16 and mixing. ing.
[0016]
Thus, when a special asphalt mixture, for example, a drainage asphalt mixture, is produced by the asphalt plant of the present invention, aggregate (80 to 85% by weight) and sand (15 to 20% by weight) having a particle diameter of 5 to 13 mm. Therefore, the aggregate hoppers 1a and 1c are stopped when the aggregate is supplied, and the aggregate is exclusively used by using the No. 6 crushed aggregate hopper 1b and the sand aggregate hopper 1d. Supply.
[0017]
At this time, although No. 6 crushed stone is composed of aggregates having a particle size of 5 to 13 mm, the particle size often varies. No. 6 crushed stone and sand while adjusting the cutting speed of the variable speed feeders 2b and 2d between the aggregate hopper 1b for crushed stone 6b and the aggregate hopper 1d for sand according to the shipment amount. Starts to cut out.
[0018]
The sand is supplied to the dryer 5 by the drawer conveyor 3d and the supply conveyor 4, and the No. 6 crushed stone is drawn by the drawer conveyor 3b and then supplied to the particle size adjusting sieve 8 by the flow path switching chute 6 through the particle size adjusting conveyor 9. In the particle size adjusting sieve 8, the equivalent of No. 7 crushed stone in No. 6 crushed stone, that is, the aggregate of 2.5 to 5 mm particle size is sieved and the No. 6 crushed stone consisting of aggregate of 5 to 13 mm particle size is transferred to the transfer conveyor 10. Discharge. The No. 6 crushed stone discharged to the transfer conveyor 10 is supplied to the dryer 5 via the supply conveyor 4.
[0019]
In this way, when producing the drainage asphalt mixture, the No. 7 crushed stone mixed with the No. 6 crushed stone is removed and supplied to the dryer 5, so that excess aggregate is not heated by the dryer 5, thereby saving energy. be able to. In addition, since the No. 6 crushed stone fed into the plant main body is composed of aggregate having a particle diameter of 5 to 13 mm strictly, the contamination of No. 7 crushed stone is not stored and accumulated in the aggregate storage bin 14. This saves you the trouble of extracting.
[0020]
Further, when producing a standard asphalt mixture without producing a special asphalt mixture, the aggregate is supplied from the aggregate hoppers 1a to 1d, and the flow path switching chute 6 is provided for the aggregate hopper 1b for crushed stone No. 6 The aggregate cut out through the conveyor 7 for direct conveyance is directly fed to the supply conveyor 4 and supplied to the dryer 5.
[0021]
In the present embodiment, the example in which the particle size adjusting sieve 8 is arranged between the aggregate hopper 1b and the dryer 5 has been described. However, the particle size adjusting sieve 8 is disposed at a position other than the position of the embodiment, for example, bone Needless to say, the same effect can be exhibited on the front side of the material hopper 1b, and the position of the particle size adjusting sieve can be appropriately changed without departing from the gist of the present invention.
[0022]
【The invention's effect】
As described above, in the asphalt plant according to the present invention, the particle size adjusting sieve 8 that sifts and removes the aggregate of the particle size corresponding to the No. 7 crushed stone mixed in the No. 6 crushed stone on the upstream side of the dryer 5. When the drainage asphalt mixture is produced, the aggregate of the size equivalent to No. 7 crushed stone mixed in No. 6 crushed stone is mixed and removed by the particle size adjusting sieve 8 before being sent to the dryer 5. Since the particle size was adjusted so that the total amount was within the particle size range of No. 6 crushed stone , unnecessary aggregate was not supplied and stored in the aggregate storage bin when producing the drainage asphalt mixture which is a special asphalt mixture, It is possible to operate efficiently without reducing the shipping capacity without stopping operation due to unnecessary aggregate extraction.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram showing an embodiment of an asphalt plant of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a-1d ... Aggregate hopper 5 ... Dryer 6 ... Channel switching chute 8 ... Particle size adjustment sieve 9 ... Conveyor for particle size adjustment

Claims (1)

Cut each species aggregate was stored in the aggregate hopper by a predetermined amount, lifting the plant body upper and dried by the dryer, sieved to various grain径別by a vibrating screen in asphalt plant so as to store the aggregate storage bin When a drainage asphalt mixture is produced by arranging a particle size adjusting sieve for sieving and removing aggregates having a particle size equivalent to No. 7 crushed stone mixed in No. 6 crushed stone upstream of the dryer, The aggregate of the particle size equivalent to the No. 7 crushed stone mixed in the No. 6 crushed stone in front is removed by sieving with the particle size adjusting sieve to adjust the particle size so that the total amount falls within the size range of the No. 6 crushed stone , asphalt plant, characterized in that it has the adjusted aggregate to feed the dryer.

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