JPH0452247Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention is capable of efficiently removing dust generated from the inside of the hot bin when aggregate is stored in the hot bin from the hot elevator through the screen. It concerns an asphalt plant.

"Prior Art" Conventionally, as this asphalt plant, the one shown in FIG. 2 is known.

In the figure, reference numeral 1 is an aggregate hopper that stores aggregate (crushed stone or sand) 2, and the aggregate 2 taken out from this aggregate hopper 1 is conveyed to a dryer 3 by a belt conveyor. After being dried and heated by a hot elevator 4, the particles are transported upward by a hot elevator 4, and are then dropped onto a vibrating screen 5 to be separated into predetermined particle sizes. It is stored in the hot bin 6. The aggregate stored in the hot bin 6 is weighed by an aggregate measuring tank 7 and then dumped into a mixer 8, where it is mixed with asphalt, filler, dust, etc. to produce an asphalt mixture. Ru.

The asphalt is sent from the asphalt tank 9 to a measuring device 10 and measured, and then sprayed to the mixer 8, and the filler is sent to the filler tank 11.
From the filler bin 1 by the filler elevator 12
3, and then, together with the dust stored in the dust bin 14, is weighed by a measuring device 15 and then dumped into the mixer 8.

The soot and smoke generated when the aggregate 2 is heated in the dryer 3 is sent to the exhaust fan 16 through the duct.
is absorbed by the gas and exhausted from the chimney 17,
During this time, the dust in the soot is removed by a dust collector. First, the coarse dust in the soot and dust is collected by a cyclone dust collector 19, which is a primary dust collector, through a duct 18a provided between the dryer 3 and the dryer 3, and is conveyed to the hot elevator 4 together with the aggregate 2. The cyclone dust collector 19 also collects dust in the aggregate measuring tank 7 via a duct 18b, and collects dust generated when aggregates are stored in the hot bin 6 from the hot elevator 4 via the screen 5. is collected by a scavenging duct 20 connected from the ceiling of the hot bin 6 to the vicinity of the entrance of the cyclone dust collector 19. Further, the fine dust that is not collected by the cyclone dust collector 19 passes through the cyclone dust collector 19 and is collected by a bag filter 22 which is a secondary dust collector via the dust 21, and is then moved into the dust bin 14 by the filler elevator 12. It is now being stored in

``Problem that the invention aims to solve'' However, in the above-mentioned asphalt plant, the scavenging duct is installed only near the ceiling of the screen above the hot bin, so the dust floating near the ceiling must be removed. However, it is not possible to sufficiently collect the dust that floats and descends inside the hot bin, and the dust falls and accumulates inside the hot bin. The problem was that dust of a certain particle size was stored in the hot bin, and as a result, an error occurred in the blending ratio of the aggregate, making it difficult to produce an optimal asphalt mixture.

The present invention has been developed in view of the above-mentioned problems, and it reliably removes the dust floating in the hot bin, prevents the dust from accumulating in the hot bin, and stores only aggregate of the desired particle size. The purpose of this invention is to provide an asphalt plant that can produce an optimal asphalt mixture.

``Means for Solving the Problems'' This invention uses an aggregate dryer to collect dust generated when aggregate is separated by particle size using a screen and stored in hot bins. By providing a duct between the dust collector that collects the dust in the generated soot and the upper part of the screen, and also providing a duct between the dust collector and the side of the hot bin whose interior is divided according to the grain size of the aggregate, the above-mentioned This solves the problem.

"Operation" In this invention, the aggregate is dropped onto the screen, and when it passes through the vibrating screen, dust is generated, which floats in the hot bin, but the dust that flies up above the screen is At the same time, the dust floating inside the hot bin is sucked through the duct of the side member and collected by the dust collector.
Prevent dust from accumulating inside the hot bin.

``Example'' The present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows the main part of an embodiment of the present invention, and the vicinity of the hot bin in FIG. 2 is enlarged, and the constituent elements of the present invention are added to this. The other configuration is shown in FIG. 2. It is exactly the same. Said second
Elements that are the same as those shown in the prior art in the figures are given the same reference numerals and their explanations will be omitted.

Reference numeral 6 in FIG. 1 is a hot bin for storing aggregates, and the interior thereof is divided into a plurality of sections for storing aggregates separated by particle size. In this embodiment, the storage rooms are divided into four storage rooms, and from the left side of the figure, the aggregate particle size to be stored is arranged in descending order of size: 1 bottle 6a, 2 bottle 6b, 3 bottle 6c, and 4 bottle 6d. . The hot bin 6 is then transported to the upper part of the hot bin 6 by the hot elevator 4, and is placed in the chute 4.
A screen 5 is provided to separate the aggregates introduced from a. The screen 5 has screen bodies 5a, 5a, 5a, 5a stacked in four stages.
is gently inclined downward toward the 1-bin 6a side, and the entire screen is configured to vibrate at a predetermined period, so that among the aggregates put into the screen 5, Aggregates with smaller particle sizes descend in order and are stored from the 4th bin 6d side, and larger aggregates move on the screen to the end and fall from the tip to the 1st bin 6a.

And the screen 5 is a hot bin cover 30
One end of the scavenging duct 20 is connected to the ceiling portion of the hot bin cover 30. The other end of the scavenging duct 20 is a cyclone dust collector 19 which is a primary dust collector.
At one end of the scavenging duct 20, there is a duct 31 that communicates with branch ducts 30c and 30d attached to the sides of each storage chamber 3 6c to 4 6d of the hot bin 6. The other configurations are as shown in the prior art described above.

Next, the operation of the asphalt plant according to this embodiment having the above configuration will be explained.

First, the aggregate 2 taken out from the aggregate hopper 1 is conveyed to the dryer 3 by a belt conveyor.
After being dried and heated by this dryer 3, it is transported upward by a hot elevator 4. Then, from the top of the hot elevator 4,
It is dropped onto the upper end of the vibrating screen 5 through a. Aggregate 2 dropped onto screen 5
As the screen vibrates, the particles fall through the screen body 5a in descending order of particle size and are stored from the 4th bin 6d side of the hot bin 6.
The aggregate 2 having a large particle size is stored from the tip of the screen main body 5a toward the 1-bin 6a side.

Then, when the aggregate 2 is dropped from the hot elevator 4 onto the screen 5 or falls through the vibrating screen 5, dust of the aggregate 2 is generated and floats in the hot bin, but the dust does not rise above the screen 5. The light dust that flies up is sucked into the scavenging duct 20 and the hot bin 6.
The dust that descends while floating inside each bin 6c
Branch duct 30c attached to the side of ~6d
~30d is sucked into the scavenging duct 20 via the duct 31.

Among the dust sucked into the scavenging duct 20, large-grained dust is collected by the cyclone dust collector 19 together with coarse-grained dust contained in the soot generated by the dryer 3.
The fine dust is transported again into the hot bin 6 by the hot elevator 4, while the fine dust is transferred to the cyclone dust collector 19.
is conveyed from the duct 21 to the bag filter 22, where it is collected and sent to the filler elevator 1.
After being stored in the dust bin 14 by the asphalt mixer 2, it is dropped into the mixer 8 and becomes a raw material for asphalt mixture.

Moreover, since the dust floating in the hot bin 6 is reliably collected, only aggregate of a desired particle size is stored in each of the bins 6c and 6d without the accumulation of dust. The aggregate stored in the hot bin 6 is weighed for each particle size in an aggregate measuring tank 7, and then is dumped into a mixer 8 to become a raw material for asphalt mixture.

Therefore, in the asphalt plant of the above embodiment, the one end side of the scavenging duct 20 connected to the upper part of the screen 5 and the side of the hot bin 6 are communicated with each other by the duct 31. Hot Bin 6, 3 Bin 6c - 4 Bin 6
The dust floating inside the hot bin 6 can be reliably sucked through the side branch ducts 30c to 30d and collected by the dust collector.
It is possible to prevent dust from accumulating inside the container, and only aggregate of the desired grain size is stored. As a result, there are no errors in the mix ratio of aggregates,
It is possible to produce optimal ~ asphalt composite material.

In the above embodiment, the side member of the hot bin 6 and one end side of the scavenging duct 20 are communicated with each other through the duct 31, but the present invention is not limited thereto. For example, one end of the duct 31 is connected to the side of the hot bin 6, and the other end of the duct 31 is connected to the aggregate measuring tank 7 and the cyclone dust collector 19.
You may make it communicate with the duct 18d which connects between.

"Effect of the invention" As explained in detail above, in the asphalt plant of the invention, a duct is provided between the dust collector and the upper part of the screen, and a duct is also provided between the dust collector and the side of the hot bin. This makes it possible to remove dust floating near the ceiling of the screen, and also to reliably collect dust that floats and descends inside the hot bin, preventing the dust from falling into the hot bin. As a result, the aggregate of the desired particle size is stored in the hot bin without being deposited, and as a result, there is no error in the mixing ratio of the aggregate, and an optimal asphalt mixture can be produced. It has the excellent effect of being able to

[Brief explanation of the drawing]

FIG. 1 shows a main part of an embodiment of the present invention, and is an enlarged sectional view of the vicinity of a hot bin, and FIG. 2 is an explanatory diagram showing the entire asphalt plant to explain the conventional technology. 1... Aggregate hopper, 3... Dryer, 5... Screen, 6... Hot bin, 6a... 1 bin,
6b...2 bins, 6c...3 bins, 6d...4 bins, 16...exhaust fan, 18a, 21...ducts,
19... Dust collector (cyclone dust collector), 20...
Scavenging duct, 22... Dust collector (bag filter), 30a, 30b, 30c, 30d...
...Branch duct, 31...Duct.

Claims (1)

[Scope of utility model registration request] A dryer is used to dry and heat the aggregate transported from the aggregate hopper, and the aggregate dried and heated by this dryer is separated by particle size using a screen, and the aggregate of each particle size is stored. a hot bin whose interior is partitioned for the purpose of drying and heating the aggregate; an exhaust fan that exhausts soot and smoke generated when the aggregate is dried and heated in the dryer through a duct; and a dust collector that collects dust contained in the soot and smoke. In the asphalt plant, a duct is provided between the dust collector and above the screen to collect dust generated when the aggregate is separated by particle size by a screen and stored in a hot bin. An asphalt plant, characterized in that the dust collector is provided between the dust collector and the side of the hot bin.