JPH10110406A - Measuring gate of storage bin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a measurement in a short period of time while a certain level of accuracy is being maintained within a wide range of quantity, from large quantity to small quantity, make the height of a plant lower and draw all contents out of a storage bin. SOLUTION: A gate for opening and closing an opening of a lower funnel part 2 of a storage bin 1 is divided into two parts having different dimensions. And a large gate 10, i.e., the larger part, opens and closes a lower end opening 2a of the part 2 and a small gate 13, i.e., the smaller part, opens and closes a side opening 2b of the part 2. And a chute 5 for drawing out is disposed at the side opening 2b of the part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing gate for a storage bin used in an asphalt plant or the like.

[0002]

2. Description of the Related Art In an asphalt plant, aggregates cut out from individual cold aggregate hoppers sorted according to particle size are dried and heated by a dryer, sieved again by a screen using a screen, and sieved by the sieved particle size. Aggregates are separately stored in a plurality of storage bins, aggregates of different sizes taken out of these storage bins are weighed to a desired particle size ratio by a weighing hopper, and then, the work of mixing the aggregates is performed. I have.

In the asphalt plant, a measuring gate is attached to a lower funnel of a storage bin for storing sieved aggregates of different particle sizes. FIGS. 3 and 5 show examples of conventionally known storage bin weighing gates.

[0004] Fig. 3 shows a lower funnel 2 of a storage bin 1 provided with a gate 3 for connecting left and right ears 3a with pins to open and close an opening 2a of the lower funnel 2, and is shown in the drawing. The gate is adjusted in three stages of "fully closed", "half open", and "fully open" by means of the opening degree adjusting means which is not used. In the case where a normal amount is measured by the above-described conventional measuring gate, as shown in FIG. 4A, the gate 3 which is previously in the "fully closed" state is set to the "full open" state in the initial and middle stages of the measurement. In this state (FIG. 4B), the aggregate flowing out of the gate 3 is measured and stored by the lower aggregate hopper 4. When the weighing end period is approaching, the gate 3 is set to the "half open" state (FIG. 4 (c)), and the amount of aggregate flowing out of the gate 3 is measured while being squeezed, and the aggregate finally reaches the target amount. At this point, the gate 3 is set to the "fully closed" state as shown in FIG.

On the other hand, when a small amount is measured by the above-mentioned measuring gate, as shown in FIG.
The gate 3 in the state is set to the “half open” state over a wide range from the initial stage of the measurement to the end period of the measurement (FIG. 5B),
When the aggregate reaches the target amount, the aggregate is brought into the “fully closed” state as shown in FIG. That is, when a small amount of measurement is performed, the measurement is performed with the gate kept at one opening as shown in FIG.

[0006]

In recent years, the variety of asphalt mixes has led to a wide variety of aggregates. Therefore, only a small amount or no aggregate is used depending on the particle size of the aggregates. Sometimes not. It is difficult to adjust the amount of effluent when measuring a small amount at the measuring gate of a storage bin of a conventional asphalt plant,
In fact, in the case of the one shown in FIG. 3, only one outflow form of "half open" can be set. Therefore, it is difficult to simultaneously satisfy the two things of shortening the measurement time and maintaining the measurement accuracy at the same time. there were.

Further, when there is an aggregate having a particle size that is not used at all, the cold aggregate stored in the cold aggregate hopper in advance has a variation in the particle size. Even when the aggregate is not discharged from the material hopper, when the aggregate in the other hopper is dried and heated by a dryer and then sieved and stored in a plurality of storage bins according to particle size, the aggregate is not used as described above. The phenomenon that the aggregate gradually accumulates in the storage bin that stores the aggregate having the expected particle size occurs. Therefore, when operating an asphalt plant continuously,
It is necessary to periodically extract the aggregate having the unused particle size from the storage bottle. As described above, when the aggregate is extracted from the storage bin, it is general that the aggregate production operation is stopped once and then the aggregate is extracted. When the aggregate is extracted from the storage bin 1 by the above-described conventional storage bin measuring gate shown in FIG. 3, the extracting chute 5 is provided between the storage bin 1 and the aggregate measuring hopper 4 as shown in FIG. In this case, the height L must be ensured to allow the insertion of the asphalt plant, and the asphalt plant increases accordingly, and there is a problem that the measurement error tends to increase due to the large head. There is also a problem that the chute 5 for extracting must be moved in the horizontal direction. Further, as shown in FIG. 6, a conventional storage bin measuring gate is provided with a nozzle 7 dedicated to extracting aggregates on a side of the storage bin 6, and a tip opening 7 a of the nozzle 7 is opened and closed by a gate 8. However, this kind of weighing gate has a problem that it is not possible to remove all the aggregate in the storage bin 6.

[0008] The present invention has been made in view of the above circumstances, it is possible to weigh in a short time while maintaining a constant weighing accuracy over a wide range from a large amount to a small amount, and to reduce the height of the plant. It is an object of the present invention to provide a weighing gate of a storage bin which can be drained from the storage bin.

[0009]

According to the first aspect of the present invention, a gate for opening and closing an opening of a lower funnel of a storage bin is divided into a plurality of gates, which are independently provided. It is characterized by being opened and closed. According to a second aspect of the present invention, the gate is divided into two parts, and they have different sizes. The invention according to claim 3 is characterized in that, of the two gates, the large gate opens and closes the lower end opening of the lower funnel, and the small gate opens and closes the side opening of the lower funnel. I do. The invention according to claim 4 is characterized in that a pulling chute is arranged at a side opening of the lower funnel.

[0010]

1 and 2 show an embodiment of the present invention.
This will be described with reference to FIG. The same components as those of the conventional example shown in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 1 shows a weighing gate of a storage bin according to the invention. As shown in the figure, the weighing gate G according to the present invention is 2
These are divided into individual pieces, which are different in size from each other, and are individually opened and closed.

The larger one of the two gates 10 (hereinafter, referred to as a large gate 10) opens and closes a lower end opening 2a of the lower funnel 2, and includes left and right ears 10a having a substantially triangular shape. It is composed of an arc-shaped bridge portion 10b passed to the lower ends thereof. The large gate 10 is rotatably attached to the upper part of both ears 10a at the center in the left-right direction of the lower funnel 2 of the storage bin 1 by a pin 11. The opening degree is set in three stages of "closed", "half open", and "fully open".

Of the two gates 10, the small gate 13 opens and closes the side opening 2b of the lower funnel 2, and includes left and right ears 13a and left and right ears 13a.
And a flat-plate-shaped bridge portion 13b which is passed to the side portion. The small gate 13 is rotatably attached to a portion of the storage bin 1 near the side opening 2b of the lower funnel 2 by a pin 14. By the rotation operation means,
The opening degree is set in three stages: "fully closed" shown in FIG. 2A, "half open" shown in FIG. 2B, and "fully opened" shown in FIG. Further, at a position corresponding to the side opening 2b of the lower funnel 2 of the storage bin 1, a pulling chute 5 is fixedly arranged.

Next, the operation of the weighing gate of the storage bin configured as described above will be described. When a normal amount is measured, it is performed in the same manner as that of the conventional example shown in FIG. That is, while keeping the small gate 13 in the “fully closed” state, the large gate 10 is “fully opened” in the initial and middle stages of weighing, and “half-opened” near the weighing end period, and weighed by the aggregate weighing hopper. When the target amount has been reached, the large gate 11 is brought into the "fully closed" state.

On the other hand, when a small amount of weighing is performed, FIG.
As shown in (a), the large gate 10 and the small gate 13 in the “fully closed” state are moved from the initial stage to the middle stage.
As shown in FIG. 2 (b), the state is set to "half open", and near the end of the measurement, the large gate is set to "half open" and the small gate 13 is set to "fully closed" for measurement. After that, when the aggregate weighing by the aggregate weighing hopper 4 finally reaches the target amount, the large gate 10 is also brought into the “fully closed” state. As described above, the flow rate can be adjusted in two stages even when measuring a small amount,
Aggregate measurement time can be shortened, and measurement accuracy can be improved. When the aggregate in the storage bin 1 is to be removed, the small gate 13 is set to the "fully opened" state as shown in FIG. As a result, the side opening 2b of the lower funnel 2 of the storage bin 1 is opened, and all the aggregate in the storage bin 1 is quickly discharged from the side opening 2b to the chute 5 for extraction.

In this case, the pulling chute 5 is connected to the side opening 2b of the lower funnel 2 so as to face the side opening 2b.
1b, it is not necessary to arrange it below the lower opening 2a of the lower funnel 2 as shown in FIG. For this reason, the height dimension M between the storage bin 1 and the aggregate weighing hopper 4 can be made much smaller than L in the conventional case shown in FIG. Can be made more compact and the head of the aggregate can be reduced, so that the weighing accuracy can be improved.

In the above-described embodiment of the present invention, the present invention has been described by exemplifying the measuring gate of the storage bin 1 used in the asphalt plant. However, the present invention is not limited to this, and the present invention is not limited thereto. It is also applicable to a weighing gate of a storage bin of a plant. Further, in the embodiment of the invention described above, the measuring gate is divided into two, but the present invention is not limited to this, and the measuring gate may be divided into three or more.

[0018]

As described above, according to the weighing gate of the storage bin according to the first aspect, the gate for opening and closing the opening of the lower funnel portion of the storage bin is divided into a plurality of gates, which are independently opened and closed. It is possible to adjust the opening of the gate in multiple steps because it is operated. This makes it possible to simultaneously satisfy both the shortening of the measuring time and the improvement of the measuring accuracy. According to the weighing gate of the storage bin according to claim 2, the gate is divided into two parts and they are different in size from each other, so that the opening degree of the gate can be adjusted over a wide range. Thereby, it is possible to further satisfy both the shortening of the measuring time and the improvement of the measuring accuracy. According to the weighing gate of the storage bin according to the third aspect, of the two gates, the large gate opens and closes the lower end opening of the lower funnel, and the small gate opens and closes the side opening of the lower funnel. Therefore, by opening the small gate, the contents in the storage bin can be extracted from the side, and as a result, the storage bin can be disposed lower, and the plant can be made more compact. According to the weighing gate of the storage bottle according to claim 4,
Since the pulling chute is arranged at the side opening of the lower funnel, the work of extracting from the storage bin can be performed more easily, and furthermore, the pulling chute does not need to be moved and the apparatus can be simplified. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a weighing gate of a storage bin according to the present invention.

FIG. 2 is a diagram illustrating a method of using a weighing gate of the storage bin.

FIG. 3 is a side view illustrating an example of a conventional storage bin weighing gate.

FIG. 4 is a view for explaining a method of using the conventional measuring gate of the storage bin.

FIG. 5 is a diagram illustrating a method of using the conventional storage bin measuring gate.

FIG. 6 is a side view showing another example of the conventional storage bin weighing gate.

[Explanation of symbols]

1 storage bin, 2 lower funnel, 2a lower end opening, 2
b Side opening, 4 weighing hopper, 5 chute for extraction, G gate, 10 large gate, 13 small gate

Claims (4)

[Claims] 1. A weighing gate for a storage bin, wherein a gate for opening and closing an opening of a lower funnel portion of the storage bin is divided into a plurality of parts, and the gates are independently opened and closed. 2. The weighing gate of a storage bin according to claim 1, wherein said gate is divided into two parts, and they are different in size from each other. 3. A large gate for opening and closing a lower end opening of the lower funnel, and a small gate for opening and closing a side opening of the lower funnel. 2. The weighing gate of the storage bin according to 2. 4. The weighing gate of a storage bin according to claim 3, wherein a drawing chute is disposed at a side opening of the lower funnel.