JPH0643203Y2 - Asphalt plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an asphalt plant for obtaining an asphalt mixture by drying and heating cold aggregate and mixing it with asphalt.

[Conventional technology]

As an asphalt plant that manufactures asphalt mixture, dry aggregate is dried and heated by a dryer, and this dried and aggregate is put into a screen from the discharge chute of the transport device and sieved. It is known to store the above aggregate from the hot bottle and mix it with asphalt or the like with a mixer to obtain an asphalt mixture (for example, JP 62-33762).
issue).

[Problems to be solved by the device]

In the above-mentioned asphalt plant, the drying and heating of the cold aggregate by the dryer is unstable at the start of the operation, and it is difficult to dry and heat it to a predetermined temperature, and the aggregate temperature tends to be too low or too high.

Conventionally, the above-mentioned abnormal temperature aggregate is used as it is to produce an asphalt mixture, or the asphalt mixture is discarded without being produced, but in the case of the former, there is a problem with the quality of the asphalt mixture. In the latter case, the heating energy of the aggregate is completely wasted, which is uneconomical.

An object of the present invention is to provide an asphalt plant capable of producing a high-quality asphalt mixture from the first batch and not wasting heating energy.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is to dry and heat cold aggregate with a drier, and put the dry and heated aggregate into a screen from a discharge chute of a conveying device and sieve it to divide it into a plurality of hot bottles. And store according to particle size,
In an asphalt plant that takes out the aggregate from a hot bottle and mixes it with asphalt in a mixer to form an asphalt mixture, attach a switching chute to the discharge chute, the switching chute communicates with an auxiliary bin, and the lower part of the auxiliary bin Further, a feeder for returning the aggregate in the auxiliary bin to the conveying device is provided, and the discharging chute and the switching chute are provided with switching means for switching the charging of the aggregate into the screen and the auxiliary bin.

[Action]

At the start of operation of the asphalt plant, or when it is expected that the drying heating temperature of the cold aggregate due to the dryer will fluctuate significantly due to some circumstances, the switching means is operated, the transport device is connected to the auxiliary bin via the switching chute, and the dryer is operated. Dry and heat the cold aggregate with. The aggregate dried and heated by the dryer is temporarily stored in the auxiliary bottle through the transfer device and the switching chute.

After that, when the drying and heating of the cold aggregate by the dryer is stabilized and the cold aggregate is dried and heated to a predetermined temperature, the switching means is operated to open the discharge chute and the switching chute. Then, the aggregate is sent to a screen for sieving, and the aggregate is stored in a plurality of hot bottles according to the particle size to manufacture an asphalt mixture as in the conventional method.

The aggregate of abnormal temperature stored in the auxiliary bottle is folded and returned to the transport device by a feeder, mixed with the aggregate of normal temperature and sent to the screen to be used for manufacturing asphalt mixture. Since the aggregate with abnormal temperature in the auxiliary bottle is put into the transport device little by little, the temperature of the aggregate as a whole does not change greatly and falls within an appropriate range.

In this way, aggregates with an abnormal temperature generated at the start of operation, etc.
Since the asphalt mixture is not temporarily stored in the auxiliary bottle by the switching means and the abnormal temperature is not produced, the asphalt mixture with good quality can be produced. Further, since the aggregate having an abnormal temperature in the auxiliary bottle can be returned to the small-quantity transfer device and used for manufacturing the asphalt mixture, the heating energy of the aggregate is not wasted.

〔Example〕

The attached drawings show an embodiment of the present invention. This asphalt plant is a dryer 1 for drying and heating cold aggregate.
And a hot elevator (conveying device) 2 that conveys the aggregate that has been dried and heated by the dryer 1 and that has been introduced from the carry-in port 2a
And a screen 3 for sieving the aggregate introduced from the discharge chute 2c of the hot elevator 2 according to the particle size, and hot bottles 4a, 4b, 4c, 4d for storing the aggregate sieved by the screen 3 according to the particle size, A weighing machine 5 for weighing the aggregate taken out from the hot bottles 4a, 4b, 4c, 4d, and a mixer 6 for receiving the aggregate weighed by the weighing machine 5 and mixing the aggregate with asphalt or the like. Mainly. The dryer 1, the hot elevator 2, the screen 3, the hot bottles 4a, 4b, 4c, 4d, the weighing machine 5 and the mixer 6 are all well known in the art.

Each of the hot bins 4a, 4b, 4c, 4d is provided with an overflow chute 7a, 7b, 7c, 7d, and an auxiliary bin 8 is connected to the lower end of the overflow chute 7a, 7b, 7c, 7d and A fixed amount feeding feeder 9 such as a variable bar feeder is provided below the bin 8.

Further, the discharge chute 2c is provided with a switching chute 10 branching from the discharge chute 2c, and the lower end thereof is connected to the auxiliary bin 8. A switching damper (switching means) 11 is provided at a branch portion of the switching chute 10 so that the charging of the aggregate into the screen 3 and the auxiliary bin 8 can be freely switched.

Furthermore, a discharge chute 12 is branched to the feeder 9, and a switching element 13 is provided at a branch portion of the discharge chute 12. The switching valve 13 switches between returning the aggregate sent from the feeder 9 to the hot elevator 2 and discharging it to the outside.

The movement path of the aggregate, that is, the dryer 1 → hot elevator 2 → discharge chute 2c → screen 3 → hot bins 4a, 4b, 4c, 4d → weighing machine 5 → mixer 6 route, hot bins 4a, 4b, 4c, 4d → overflow chute 7a, 7b, 7c, 7d → auxiliary bin 8 → feeder 9 → hot elevator 2 route and hot elevator 2 → change chute 10 → auxiliary bin 8
→ Both paths of the feeder 9 are hermetically sealed.

Then, the code 14 is overflow shoots 7a, 7b, 7c, 7d.
Is a roof provided at the upper end of the screen, and prevents aggregates falling from the screen 3 to the hot bottles 4a, 4b, 4c, 4d from directly entering the overflow chutes 7a, 7b, 7c, 7d. Further, reference numeral 15 is an outflow detector for detecting that the aggregate is flowing out to the overflow chutes 7a, 7b, 7c, 7d.

Next, the operation of the asphalt plant according to the present invention constructed as above will be described.

At the start of operation of the asphalt plant, etc.
As shown in the drawing, the switching damper 11 is tilted so that the inlet side of the switching chute 10 is opened to communicate the switching chute 10 with the hot elevator 2, and the switching chute 13 closes the discharge chute 12 for operation. In this state, the aggregate having an abnormal temperature dried and heated by the dryer 1 enters the hot elevator 2 through the charging port 2a, passes through the switching chute 10 and the auxiliary bin 8
Stored in.

When the time (usually about 1 to 5 minutes) has elapsed and the drying and heating of the cold aggregate by the dryer 1 becomes stable and the aggregate at a predetermined temperature is produced, the switching damper 11 is tilted in the opposite direction to the above. Switch chute 10 to close and discharge chute
Open 2c. By this switching operation, the aggregate dried and heated by the dryer 1 is discharged from the hot elevator 2 by the discharge chute 2c.
It is thrown into the screen 3 from the
It is stored in the hot bottles 4a, 4b, 4c, 4d according to the particle size as in the conventional case.

Further, when the normal operation is started, the feeder 9 is actuated to return a small amount of the abnormal temperature aggregate in the auxiliary bin 8 to the hot elevator 2 from the charging port 2b and mix it with the proper temperature aggregate, and the screen 3 To produce asphalt mix. In addition, when returning the aggregate of abnormal temperature to the hot elevator 2, when the temperature of the aggregate of abnormal temperature is too high, it mixes with the aggregate of lower proper temperature, and conversely, the temperature of the aggregate of abnormal temperature is high. If the value is too low, it is preferable to mix it with the aggregate having a higher appropriate temperature.

In the operation of an asphalt plant, the amount of asphalt mixture used decreases, or the amount of aggregate production increases,
When the relative input amount of the aggregate into the hot bins 4a, 4b, 4c, 4d increases and exceeds the aggregate maximum storage level, the excess aggregate is overflow chute 7a, 7b, 7b of the hot bins 4a, 4b, 4c, 4d. 7c,
It is temporarily stored in the auxiliary pin 8 through 7d. Therefore, even if the amount of aggregate stored in the hot bins 4a, 4b, 4c, 4d fluctuates greatly and the aggregate overflows into the hot bin, excess aggregate does not leak out, and dust Environmental pollution is prevented.

The outflow detector 11 has overflow shoots 7a, 7b, 7
It detects the excess aggregate flowing out to c and 7d and notifies it.

In addition, as the amount of asphalt mixture used increases, or the production amount of aggregate decreases, the relative input amount of aggregate to hot bottles 4a, 4b, 4c, 4d decreases, and hot bottles 4a, 4b, 4c, 4
When the aggregate storage amount in d decreases, the feeder 9 is operated to supply the excess aggregate in the auxiliary bin 8 to the hot elevator 2, and the hot bins 4a, 4b, 4
Store in c, 4d. Therefore, the heating of the excess aggregate is not wasted. When it becomes necessary to take out the aggregate in the auxiliary pin 8 to the outside, the discharge chute 12 is opened by operating the switching valve 13.

The number of hot bins 4a, 4b, 4c, 4d and auxiliary bins 8 is not limited to the above, and the number of hot bins is 3 or less, or 5 or more, or the number of auxiliary bins 8 is 2.
It can be more than one. Also, overflow chute need not be provided in every hot bin. It is also possible to connect the feeder 9 to the same inlet 2a as the dryer 1.

[Effect of device]

As described above, in the asphalt plant according to the present invention, the cold aggregate is dried and heated by the dryer, and the dried and heated aggregate is put into the screen from the discharge chute of the conveying device and sieved, and the particle size is divided into a plurality of hot bottles. In an asphalt plant in which the aggregate is stored separately and taken out of the hot bottle and mixed with asphalt in a mixer to form an asphalt mixture, a switching chute is attached to the discharge chute, and an auxiliary bottle is connected to the switching chute. In addition, the auxiliary bin is provided with a feeder for returning the aggregate in the auxiliary bin to the transfer device, and the discharging chute and the switching chute are provided with a switching means for switching the loading of the aggregate into the screen and the auxiliary bin. Bone of abnormal temperature that impairs the quality of asphalt mixture at the start of operation etc. Even if occurs, since the aggregate having the abnormal temperature can be stored in the auxiliary bottle by the switching by the switching means and once removed from the asphalt mixture manufacturing system, a high-quality asphalt mixture can be manufactured. . In addition, since the aggregate with the abnormal temperature in the auxiliary bottle can be returned to the small amount delivery device and used for the production of the asphalt mixture, the heating energy of the aggregate is not wasted and it is economical. . In addition, when the amount of aggregate produced by the dryer is extremely low at the end of operation and the screen sieving function may change, the aggregate of the appropriate temperature should be gradually adjusted by adjusting the switching means. It is also possible to take it out to an auxiliary bottle, store it, and supply the aggregate to the screen to prevent the functional change of the screen.

[Brief description of drawings]

FIG. 1 is a partially broken front view showing an embodiment of the asphalt plant according to the present invention, and FIG. 2 is a partially broken side view. 1 ... Dryer, 2 ... Hot elevator (conveyor), 2c
... discharge chute, 3 ... screen, 4a, 4b, 4c, 4d ... hot bottle, 6 ... mixer, 8 ... auxiliary bin, 9 ... feeder, 10
… Switching chute, 11… Switching damper (switching means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomohiro Gomachi, 19-11 Kyobashi, Chuo-ku, Tokyo 1-1911, Kyobashi, Japan (72) Inventor, Masamasa Yamabe 1-1-19, Kyobashi, Chuo-ku, Tokyo No. within Japan Tamado Co., Ltd. (72) Inventor Yoshimitsu Hashimoto 1-19-11 Kyobashi, Chuo-ku, Tokyo Within Japan Tamado Co., Ltd. (72) Kazuki Omiya 1-19-11 Kyobashi, Chuo-ku Japan Tappudo Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A cold aggregate is dried and heated by a dryer, and the dried and heated aggregate is put into a screen from a discharge chute of a conveying device and sieved to be stored in a plurality of hot bottles according to particle size. In an asphalt plant that is taken out from a mixer and mixed with asphalt in a mixer to form an asphalt mixture, a switching chute is attached to the discharge chute, the switching chute is connected to an auxiliary bin, and the auxiliary bin is below the auxiliary bin. An asphalt plant characterized in that a feeder for returning the aggregate therein is returned to the transporting device, and the discharge chute and the switching chute are provided with switching means for switching the loading of the aggregate into the screen and the auxiliary bin.