JP7253185B2 - asphalt plant - Google Patents

Description

The present invention relates to an asphalt plant , and more particularly to a plant that switches the supply destination of aggregates coming out of a hot bin to a mixer or a material hopper.

Conventionally, an asphalt plant 301 as shown in FIG. 3 is known. The asphalt plant 301 has a hot bin 303 , an aggregate weigher 305 and a mixer 307 .

The hot bin 303 stores heated and dried aggregate. Aggregate weigher 305 measures the aggregate supplied from hot bin 303 to mixer 307 . The mixer 307 mixes a predetermined amount of aggregate weighed by the aggregate weigher 305, a predetermined amount of filler supplied from a filler supply unit (not shown), and a predetermined amount of asphalt supplied from an asphalt supply unit (not shown). It is mixed to produce asphalt mixture.

Here, for example, Japanese Patent Laid-Open No. 2003-100000 can be cited as a document related to the conventional technology.

JP 2008-214879 A

During production of asphalt mixture, the aggregate stored in the hot bin 303 may be left over. If the aggregate remaining in the hot bin 303 is left as it is, the temperature of the aggregate will drop, and as it is, it cannot be used as a material for the asphalt mixture.

Therefore, the hot bin 303 is provided with an aggregate extractor 309 so that the surplus aggregate can be extracted from the hot bin 303 . The aggregate extracted from the extractor 309 is received by, for example, a shovel and transported to a yard for reuse.

By the way, there is a problem that a large amount of dust (such as dust contained in the aggregate) is discharged to the surroundings when the aggregate extracted from the extracting portion 309 is received by the shovel.

The present invention has been made in view of the above problems, and in an asphalt plant and method for producing asphalt mixture in which aggregates discharged from a hot bin are used to produce asphalt mixture in a mixer, aggregates are added to the hot bin. To provide an aggregate that can be reused without diffusing dust generated from the surplus aggregate into the air even when the surplus aggregate is left over.

The invention according to claim 1 comprises a hot bin for storing aggregate, a material hopper for storing aggregate discharged from the hot bin, and a mixer or the material hopper for supplying the aggregate discharged from the hot bin. an aggregate dryer that heats and dries the aggregate coming out of the material hopper and supplies the heated and dried aggregate to the hot bin;
a weighing gate provided in the hot bin; and an aggregate weighing device for weighing the aggregate to be supplied to the mixer. The asphalt plant is configured to switch the supply destination of the aggregate falling from the weighing gate to the aggregate weigher to the mixer or the material hopper.

The invention according to claim 2 is the asphalt plant according to claim 1, wherein when the mixer is producing the asphalt mixture, the switching unit transfers the aggregate coming out of the hot bin to the mixer. and when the aggregate in the hot bin remains, the aggregate coming out of the hot bin is supplied to the material hopper.

The invention according to claim 3 is the asphalt plant according to claim 1 or 2 , wherein when the aggregate in the hot bin is supplied to the material hopper, Aggregate conveying for conveying the discharged aggregate to the material hopper, conveying the aggregate discharged from the material hopper to the aggregate dryer, and conveying the aggregate discharged from the aggregate dryer to the hot bin. The aggregate conveying unit is an asphalt plant that uses a cover so that even if dust is generated from the aggregate, the generated dust is not dispersed into the atmosphere.

According to the present invention, in an asphalt plant and an asphalt mixture production method for producing asphalt mixture in a mixer using aggregates discharged from a hot bin, even if aggregate remains in the hot bin , there is an effect that the dust generated from the surplus aggregate can be reused without being diffused into the air.

It is a figure showing composition of an asphalt plant concerning an embodiment of the present invention. It is a figure which shows the more detailed structure of the asphalt plant which concerns on embodiment of this invention. It is a figure which shows the conventional asphalt plant.

An asphalt plant 1 according to an embodiment of the present invention produces (manufactures) an asphalt mixture used for surface layers and base layers of asphalt pavements such as roads. , a material hopper 5 , a switching section (discharge damper) 7 , an aggregate dryer 9 and a mixer 11 .

The hot bin 3 stores (stores) the aggregate that is the constituent material of the asphalt mixture and that has been heated and dried by the aggregate dryer 9 . The material hopper 5 stores (stores) the aggregate that has come out of the hot bin 3 .

The switching unit 7 switches the supply destination (delivery destination) of the aggregate discharged from the hot bin 3 to the mixer 11 or the material hopper 5 . The aggregate dryer 9 heats and dries the aggregate discharged from the material hopper 5 and supplies (sends) the heated and dried aggregate to the hot bin 3 .

In the aggregate dryer 9, in place of or in addition to the aggregate coming out of the material hopper 5, other aggregate not contained in the material hopper 5 (separately stored aggregate or aggregate transported by truck) is supplied. aggregate) may be supplied.

The asphalt plant 1 is also provided with a filler supply section 13 that supplies filler to the mixer 11 and an asphalt supply section 15 that supplies asphalt to the mixer 11 .

The switching unit 7 supplies the aggregates coming out of the hot bin 3 to the mixer 11 when the mixer 11 is producing the asphalt mixture, and the aggregates come out of the hot bin 3 when the hot bin 3 has surplus aggregates. It is configured to supply aggregate to the material hopper 5 .

When the aggregate from the hot bin 3 is supplied to the mixer 11 by switching the switching unit 7, the filler is supplied from the filler supply unit 13 to the mixer 11, and the asphalt is supplied to the mixer 11 from the asphalt supply unit 15. It has become so. Then, the mixer 11 mixes the aggregate, filler, and asphalt to produce an asphalt mixture.

Further, the switching unit 7 removes the aggregate from the hot bin 3 when the supply of the aggregate to the mixer 11 becomes unnecessary due to the stoppage of production of the asphalt mixture even though the aggregate remains in the hot bin 3 . The material hopper 5 is configured to supply the collected aggregates.

That is, when the aggregate in the hot bin 3 remains, all the aggregate in the hot bin 3 is supplied to the material hopper 5 to empty the hot bin 3 and store the aggregate in the material hopper 5. It is designed to be

Then, when the asphalt mixture is needed again, as described above, the aggregate is supplied from the material hopper 5 to the aggregate dryer 9, the aggregate is heated and dried by the aggregate dryer 9, and the heated aggregate is dried. Dry aggregate is supplied to the hot bin 3, aggregate is supplied from the hot bin 3 to the mixer 11, and asphalt mixture is produced.

By switching the switching unit 7, the aggregate supplied from the hot bin 3 to the material hopper 5, coming out of the material hopper 5, heated and dried by the aggregate dryer 9, is supplied again to the hot bin 3, and the switching unit 7 The aggregate is supplied to the mixer 11, and when the aggregate in the hot bin 3 remains, it is supplied to the material hopper 5.

Here, the asphalt plant 1 will be described in more detail with reference to FIG.

The asphalt plant 1 is further provided with a weighing gate 17, an aggregate weigher 19, a discharge chute 21, a conveying conveyor (for example, a belt conveyor) 23, a conveying elevator 25, a conveying conveyor (for example, a belt conveyor) 27, and a conveying device 29. It is

The weigh gate 17 and the aggregate weigher 19 are for weighing the aggregate used when the asphalt mixture is produced by the mixer 11 . The discharge chute 21, the transport conveyor 23, and the transport elevator 25 transport the aggregate coming out of the hot bin 3 to the material hopper 5 when the aggregate in the hot bin 3 is supplied to the material hopper 5. It is something to do.

A weighing gate 17 is provided at the lower end of the hot bin 3 . Then, the aggregate falling from the hot bin 3 and coming out of the hot bin 3 is weighed. The aggregate weigher 19 weighs the aggregate that has come out of the weighing gate 17 and is supplied to the mixer 11 .

The switching unit 7 is provided in the aggregate weighing device 19 and is configured to switch the supply destination of aggregates falling from the weighing gate 17 of the hot bin 3 to the aggregate weighing device 19 to the mixer 11 or the material hopper 5 . ing.

To explain further, the aggregate weigher 19 is configured to have a housing containing aggregates and the like inside, and the discharge damper 7 is provided in the housing, and the upper end of the discharge damper 7 is located at the above-mentioned position. It is rotatably engaged with the housing. By rotating the discharge damper 7 to one side, the aggregate dropped from the weighing gate 17 is supplied to the mixer 11, and the switching section 7 is rotated to the other side. Thus, the aggregate dropped from the weighing gate 17 is supplied to the material hopper 5. As shown in FIG.

The conveying conveyor 27 conveys the aggregate coming out of the material hopper 5 to the aggregate dryer 9 , and the conveying device 29 conveys the aggregate coming out of the aggregate dryer 9 to the hot bin 3 .

As already understood, the discharge chute 21, the transport conveyor 23, the transport elevator 25, the transport conveyor 27, the transport device 29, etc. form an aggregate transport section. By using a cover (not shown) or the like in this aggregate conveying unit, the aggregate is hardly exposed to the atmosphere outside the cover, and even if dust is generated from the aggregate, the generated dust can be removed from the atmosphere. It is designed not to dissipate inside.

In addition, a cover or the like is provided on the path of the aggregate between the weighing gate 17 and the aggregate weigher 19 to prevent dust generated from the aggregate from diffusing into the atmosphere.

Next, the operation of the asphalt plant 1 will be explained.

As an initial state, heat-dried aggregates are contained in the hot bin 3, and the material hopper 5 and the aggregate dryer 9 are empty (contain only air).

In the initial state, the aggregate in the hot bin 3 is supplied to the mixer 11 , the filler is supplied to the mixer 11 from the filler supply section 13 , and the asphalt is supplied to the mixer 11 from the asphalt supply section 15 . Then, the mixer 11 produces an asphalt mixture.

When the production of the asphalt mixture is finished, if there is a surplus of aggregate in the hot bin 3, the switching unit 7 is switched to supply the aggregate in the hot bin 3 to the material hopper 5, stores aggregates in

When restarting the production of the asphalt mixture, the aggregate in the material hopper 5 is supplied to the aggregate dryer 9, the aggregate dried by heating in the aggregate dryer 9 is supplied to the hot bin 3, and the switching unit 7 is switched. , the aggregate in the hot bin 3 is supplied to the mixer 11 , the filler is supplied to the mixer 11 from the filler supply section 13 , and the asphalt is supplied to the mixer 11 from the asphalt supply section 15 .

According to the asphalt plant 1, there are hot bins 3 for storing aggregates, material hoppers 5 for storing aggregates discharged from the hot bins 3, and mixers 11 or material hoppers 5 for supplying aggregates discharged from the hot bins 3. When the hot bin 3 has surplus aggregates, it is possible to eliminate the work of discharging the surplus aggregates into the atmosphere and receiving them with a shovel. It can be placed directly in the aggregate, and by receiving it with an aggregate shovel, it is possible to suppress the emission of dust generated from the aggregate into the atmosphere.

As a result, deterioration of the environment can be prevented. In addition, conventionally, in order to prevent dust from being generated when the aggregate is received by an aggregate shovel, there is a case where the aggregate is mixed with asphalt, but this asphalt is no longer necessary.

Further, according to the asphalt plant 1, the aggregate remaining in the material hopper 5 and coming out of the material hopper 5 is heated and dried by the aggregate dryer 9, and the heated and dried aggregate is placed in a hot bin. 3, surplus aggregates in the material hopper 5 can be easily reused.

In addition, according to the asphalt plant 1, the surplus aggregate in the hot bin 3 is put into the material hopper 5 without being returned to the yard as in the conventional case, so the amount of heat radiation from the aggregate can be reduced as much as possible. Waste of heat can be reduced.

Further, according to the asphalt plant 1, when using the surplus aggregate, the surplus aggregate is supplied to the material hopper 5 without passing it through the mixer 11, so the aggregate passing through the mixer 11 can be eliminated. Therefore, abrasion of the mixer 11 can be suppressed.

Here, an asphalt plant (not shown) according to a modification will be described.

The asphalt plant according to the modification is different from the above-described asphalt plant 1 in that no material hopper is provided, and is configured similarly to the above-described asphalt plant 1 in other respects.

That is, the asphalt plant according to the modification includes a hot bin, an aggregate dryer, a switching section (discharge damper), a mixer, a filler supply section, an asphalt supply section, and the like.

The hot bin stores the aggregate that has been heated and dried by the aggregate dryer. The aggregate dryer heats and dries the aggregate coming out of the hot bin, and supplies the heated and dried aggregate to the hot bin. It is a thing.

The switching unit switches the supply destination of the aggregate coming out of the hot bin to the mixer or the aggregate dryer, the filler supply unit supplies the filler to the mixer, and the asphalt supply unit supplies the asphalt to the mixer. It supplies to

In addition, the switching unit supplies the aggregate coming out of the hot bin to the mixer when the asphalt mixture is being produced by the mixer, and the aggregate coming out of the hot bin is supplied to the mixer when the aggregate in the hot bin remains. configured to feed a material dryer.

The aggregate supplied to the aggregate dryer is heated and dried by the aggregate dryer when restarting the production of asphalt mixture in the mixer, and this dried aggregate is supplied to the hot bin to produce asphalt mixture. sent to a mixer for

To explain further, when the aggregate in the hot bin is left over, the aggregate in the hot bin is left as it is in the hot. Then, when asphalt mixture is required, aggregate is supplied from the hot bin to the aggregate dryer, the hot bin is emptied, the aggregate supplied from the hot bin is heated and dried by the aggregate dryer, and this heated and dried The mixed aggregate is supplied to the hot bin, and the aggregate is supplied from the hot bin to the mixer to produce the asphalt mixture.

According to the asphalt plant according to the modification, since no material hopper is provided, the configuration of the asphalt plant is simplified.

In addition, when the aggregate in the hot bin remains, the aggregate in the hot bin is transferred to the aggregate dryer, and when the asphalt mixture is required, the aggregate in the aggregate dryer is heated. After drying, the heated and dried aggregate is supplied to a hot bin, and the aggregate is supplied from the hot bin to a mixer to produce an asphalt mixture.

By the way, the above description may be understood as an invention of a method.

That is, a hot bin storage step of storing the aggregate in a hot bin, a switching step of switching the supply destination of the aggregate coming out of the hot bin to the mixer or the material hopper using a switching unit, and a a material hopper storage step of storing the aggregate coming out of the hot bin in the material hopper when the supply destination of the aggregate is switched to the material hopper in the switching step; A hot bin supply step of discharging the stored aggregate from the material hopper, heating and drying the aggregate discharged from the material hopper with an aggregate dryer, and supplying the heated and dried aggregate to the hot bin. Then, when the supply destination of the aggregate coming out of the hot bin is switched to the mixer in the switching step, the asphalt, the filler, and the aggregate coming out of the hot bin are supplied to the mixer, and these It may be grasped as a production method of asphalt mixture having a mixing step of mixing the supplied materials.

Here, in the switching step, when the mixer is producing the asphalt mixture, the aggregate that has come out of the hot bin is supplied to the mixer, and when the aggregate in the hot bin is left over, the aggregate is taken out of the hot bin. It may be a step of supplying the collected aggregate to the material hopper.

Further, the contents described above are combined into a hot bin storing step of storing aggregate in a hot bin, a switching step of switching the supply destination of aggregate coming out of the hot bin to a mixer or an aggregate dryer by a switching unit, and When the supply destination of the incoming aggregate is switched to the mixer in the switching step, the asphalt, the filler, and the aggregate coming out of the hot bin are supplied to the mixer and mixed. and a mixing step to heat and dry the aggregate coming out of the hot bin with the aggregate dryer when the supply destination of the aggregate coming out of the hot bin is switched to the aggregate dryer in the switching step. , and a supply step of supplying the heated and dried aggregate to the hot bin.

1 Asphalt Plant 3 Hot Bin 5 Material Hopper 7 Switching Part (Discharge Damper)
9 aggregate dryer 11 mixer 17 weighing gate 19 aggregate weigher

Claims (3)

a hot bin for storing aggregate;
a material hopper for storing aggregates coming out of the hot bin;
a switching unit that switches the supply destination of the aggregate coming out of the hot bin to the mixer or the material hopper;
an aggregate dryer that heats and dries the aggregate coming out of the material hopper and supplies the heated and dried aggregate to the hot bin;
a weighing gate provided in the hot bin;
an aggregate weigher for weighing the aggregate supplied to the mixer;
wherein the switching unit is provided in the aggregate weighing device, and switches the supply destination of the aggregate falling from the weighing gate of the hot bin to the aggregate weighing device to the mixer or the material hopper An asphalt plant characterized by being configured as follows . An asphalt plant according to claim 1,
The switching unit supplies the aggregates coming out of the hot bin to the mixer when the mixer is producing the asphalt mixture, and when the aggregates in the hot bin are left over, the aggregates come out of the hot bin. An asphalt plant, characterized in that it is arranged to supply aggregate to said material hopper. The asphalt plant according to claim 1 or claim 2,
When the aggregate in the hot bin is supplied to the material hopper, the aggregate coming out of the hot bin is conveyed to the material hopper, and the aggregate coming out of the material hopper is transferred to the material hopper. An aggregate conveying unit that conveys aggregates to an aggregate dryer and conveys aggregates coming out of the aggregate dryer to the hot bin,
The asphalt plant according to claim 1, wherein the aggregate conveying unit uses a cover so that even if dust is generated from the aggregate, the generated dust is not dispersed into the atmosphere.

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