JP3543014B2 - Asphalt plant - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an asphalt plant for producing an asphalt mixture as a road pavement material.
[0002]
[Prior art]
In an asphalt plant, aggregates are cut out at a desired ratio from an aggregate hopper that stores the aggregates by type, heated by a dryer that is a heating device, and temporarily stored in the aggregate storage bin of the plant body by particle size, Aggregates of various particle sizes are weighed in predetermined amounts based on the composition of the asphalt mixture to be manufactured, and are charged into a mixer. Asphalt mixture is produced by adding molten asphalt and the like.
[0003]
And when aggregates are left in the aggregate storage bin at the end of shipping, or when the aggregate temperature drops due to waiting for shipping time etc. and the stored aggregates can not be used, etc. Open the weighing gate at the lower part of the aggregate storage bin to discharge the aggregate in the aggregate storage bin to the weighing tank, and discharge it to the excavator, etc., which is located below the lower mixer, to collect the bone in the aggregate yard. It is generally collected in a material hopper.
[0004]
[Problems to be solved by the invention]
However, when the aggregate in the aggregate storage bin is discharged through a measuring tank, a mixer, and a shovel car, a large amount of dust is scattered due to the dryness of the aggregate. The balance of the particle size may be lost.
[0005]
Also, when the temperature of the aggregate decreases, it is troublesome to take it out of the aggregate storage bin and return it to the aggregate hopper, and if the temperature has not decreased but returned to the aggregate hopper, return to the aggregate hopper. Cooling the aggregate is not preferable from the viewpoint of thermal efficiency.
[0006]
In view of the above, the present invention provides an asphalt plant that treats aggregate remaining in an aggregate storage bin in a state in which generation of dust is reduced as much as possible, and enables reheating of the aggregate whose temperature has decreased. The purpose is to:
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention forms an aggregate intermediate charging section for charging the aggregate near a middle portion of a dryer which is an aggregate heating device, and heats the aggregate heated by the dryer to a particle size. At the lower part of each aggregate storage bin that stores each aggregate, an aggregate extraction gate that extracts aggregate separately from the weighing gate for aggregate measurement is arranged in parallel, and each aggregate extraction gate is connected to the aggregate It is characterized in that it is connected to the aggregate transfer means disposed below the extraction gate, and that the leading end of the aggregate transfer means is connected to the intermediate supply part formed near the middle part of the dryer. .
[0008]
[Action]
According to the asphalt plant in the present invention, when the remaining bone material aggregate storage bin is not discharged to the plant out at that time, it was arranged on each bottom of each aggregate storage bins at next shipment Aggregate is extracted from the aggregate extraction gate, reduced to the dryer through the aggregate intermediate input section of the dryer via the aggregate transfer means, reheated by the dryer, stored again in each aggregate storage bin, and used. To do.
[0009]
Similarly, when the aggregate temperature in the aggregate storage bin is lowered due to waiting for shipment, the aggregate is extracted from the aggregate extraction gate, and the aggregate intermediate input portion of the dryer is transferred via the aggregate transfer means. It is further reduced to a dryer, reheated by the dryer, stored again in the aggregate storage bin, and used.
[0010]
In this way, by performing the heat treatment again without reusing the aggregate to the outside and reusing it, it is possible to prevent the generation of dust and to quickly cope with the temperature decrease in the aggregate storage bin. .
[0011]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
Reference numeral 1 denotes a dryer for heating the aggregate, and the dryer 1 rotatably supports a cylindrical drum 2 having a large number of scraping blades (not shown) provided on an inner periphery thereof so as to be rotatable on a machine base 3. Hot air is fed into the drum 2 from a burner 5 disposed on a hot hopper 4 at one end of the drum 2 while being driven at a predetermined speed by a driving device (not shown). A high-temperature gas flow passing through the inside of the drum 2 is maintained by sucking exhaust gas by an exhaust fan (not shown) at the end of an exhaust flue 7 connected to 6.
[0013]
As shown in FIG. 2, a through hole 8 is formed in the peripheral wall of the drum 2 near the center of the drum 2, which is surrounded by a cover body 9, and the through hole 8 faces the inside of the cover body 9. A guide chute 10 is disposed on the outer peripheral wall of the drum. The aggregate input chute 11 is disposed on the cover body 9 to form an intermediate aggregate input section 12, and the aggregate supplied to the intermediate aggregate input section 12 is scooped up by the guide chute 10 of the cover body 9. It is supplied from the through hole 8 into the drum 2.
[0014]
On the other hand, the aggregate sent into the drum 2 by the belt conveyor 13 comes into contact with the high-temperature gas flow while rolling down the inside of the drum 2 while being scraped up by the scraping blades, and the temperature is raised to a desired temperature, and It is discharged from a discharge section 14 provided in the hopper 4.
[0015]
The aggregate discharged from the drum 2 is lifted up to the upper part of the plant body 16 by the bucket elevator 15, slides down the discharge chute 17, is put into the vibrating sieve 18, is sieved, and is stored in the aggregate storage bin 19 for each particle size. Is done.
[0016]
Below the aggregate storage bin 19 in the upper part of the plant body 16, an aggregate weighing tank 20 for weighing the aggregate, a stone powder storage bin 22 for storing the stone powder transported by the stone powder elevator 21, a stone powder weighing tank 23, and a molten asphalt are stored. An asphalt measuring tank 24 and a mixer 25 to be measured are provided, and a predetermined amount of materials is measured and mixed to produce an asphalt mixture.
[0017]
The aggregate extraction gate 27 is at the bottom of extracting the bone material from the metering gate 26 and aggregate storage bin 19 to pay out aggregate to aggregate measuring tank 20 as shown in Figure 3 of the aggregate storage bin 19 A screw conveyor 28 serving as an aggregate transfer means is provided below the aggregate extraction gate 27, and the screw conveyor 28 and the aggregate extraction gate 27 are connected to each other. ing.
[0018]
The distal end of the screw conveyor 28 is connected to the aggregate input chute 11 of the aggregate intermediate input section 12 disposed near the center of the drum 2, and the aggregate extracted from the aggregate extracting gate 27 is used for the drum 2. The drum 2 can be charged from the vicinity of the intermediate portion.
[0019]
Further, in the middle of the screw conveyor 28, an aggregate take-out gate 29 for taking out aggregate and an aggregate take-out chute 30 are provided.
[0020]
In the case where the asphalt mixture has been shipped and the aggregate remains in the aggregate storage bin 19, the aggregate is conventionally taken out and collected in the aggregate hopper. leave stored in timber storage bin 19, the next to drive the screw conveyor 28 together with the operation of the dryer 1 when shipped, aggregate extraction respective aggregate the gate 27 is opened storage bottle 19 for each aggregate storage bin 19 The aggregate therein is fed into the drum 2 from the aggregate intermediate charging section 12 disposed near the center of the dryer 1. The aggregate heated by the dryer 1 is lifted to the upper part of the plant body 16 by the bucket elevator 15, sieved again by the vibrating sieve 18, stored in each aggregate storage bin 19 for each particle size, and reused.
[0021]
When the aggregate temperature in each of the aggregate storage bins 19 decreases due to waiting for shipment or the like, the screw conveyor 28 is driven in the same manner as described above, and the aggregate extraction gate 27 is opened to lower the temperature. The aggregate is sent to the dryer 1 and heated, then lifted again to the plant body 16 and stored in each aggregate storage bin 19 for use.
When the inside of the aggregate storage bin 19 is emptied, the aggregate storage bin 19 can be taken out from the aggregate take-out gate 29 disposed in the middle of the screw conveyor 28 via the aggregate take-out chute 30.
[0023]
As described above, when the aggregate remains in each of the aggregate storage bins 19 or when the temperature of the aggregate decreases, the inside of the plant is not generated without generating a large amount of dust unless it is necessary to remove the aggregate. It can be recycled and reused, which is favorable for pollution. In addition, since it is only necessary to reheat only the temperature drop, improvement in thermal efficiency can be expected.
[0024]
Furthermore each level meter 31 above each aggregate storage bin 19, as shown in FIG. 4, also disposed a thermometer 32 and the like downward, the level meter 31 detects the upper limit storage amount of the aggregate bone It is also possible to open the gate 27 for extracting the aggregate and discharge the aggregate to the outside from the aggregate extracting chute 30 to omit the conventional overflow pipe. Alternatively, the temperature of the aggregate may be detected by the thermometer 32, and the reheating operation may be automatically performed when the temperature drops.
[0025]
【The invention's effect】
In the asphalt plant according to the present invention as described above, separately from juxtaposed aggregate extraction gate 27 and the metering gate 26 to each of the aggregate storage bin 19 which is disposed above the plant body 16 together, each aggregate extraction gate 27 connected to the screw conveyor 28 for aggregate transport, and ligated to further aggregate intermediate input unit 12 to the distal end portion is disposed near the center portion of the drum 2 of the screw conveyor 28 Therefore, even if the aggregate remains in each of the aggregate storage bins 19 at the end of shipment, or if the temperature of the aggregate in each of the aggregate storage bins 19 decreases, the aggregate is not taken out as in the related art. It can be reused by heating it again with a dryer, and there is an advantage that a large amount of dust does not need to be radiated for reuse, so that it can be brought into a favorable state in terms of pollution. In the case of reheating due to a temperature drop, it is sufficient to heat only the temperature drop, so that an improvement in thermal efficiency can be expected.
[Brief description of the drawings]
FIG. 1 is a partially omitted front view showing an asphalt plant of the present invention.
FIG. 2 is an enlarged sectional view in which a part of a line AA in FIG. 1 is omitted.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is an explanatory diagram showing a case where various sensors are attached to FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Dryer 2 ... Drum 12 ... Aggregate intermediate charging part 16 ... Plant main body 19 ... Aggregate storage bin 27 ... Aggregate extraction gate 28 ... Screw conveyor (aggregate transfer means)

Claims (1)

While forming the aggregate intermediate input unit for introducing aggregate near the middle portion of the dryer is aggregate heating device, of the aggregate storage bin for storing the heated aggregate which is heated by the dryer on the particle each diameter of each In the lower part, aggregate extraction gates for extracting aggregate separately from the measurement gates for measuring aggregates are juxtaposed, and each aggregate extraction gate is arranged below the aggregate extraction gate. An asphalt plant, wherein the asphalt plant is connected to a transfer means, and the leading end of the aggregate transfer means is connected to the intermediate feed portion formed near the middle part of the dryer.

Images