JPH07167542A - Aggregate-cooling apparatus and its operation method - Google Patents

Abstract

PURPOSE:To provide an aggregate-cooling apparatus and its operation method wherein aggregates are cooled by heat exchanging between a cooling water and graded aggregates in a pair of aggregate bins in an arrangement for receiving, storing, and discharging the aggregates. CONSTITUTION:A top section of an aggregate bin 10 is formed as an opened edge, and a water dispersing means 38 is set there, a bottom section is formed as a closed edge, and a discharging opening 13 for cooled aggregates and cooling water is arranged, and feeder is provided for discharging the cooled aggregates and the cooling water, after separation and water removal through a partition plate arranged in an inside, in the discharging opening 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aggregate cooling device and a method of operating the same.

[0002]

2. Description of the Related Art When a mass concrete or the like is constructed, concrete is produced by using a cooling aggregate or the like to prevent the occurrence of cracks or the like due to shrinkage due to the temperature decrease of the concrete during construction. In order to obtain this kind of cooled aggregate, many methods such as immersion cooling method of the aggregate in which the aggregate is immersed and cooled in cold water have been adopted ("Revised Refrigeration Air Conditioning Handbook Application Edition" edited by the Japan Refrigeration Association, (Sho 5
1.7.20), P651).

That is, in an aggregate production plant, aggregates classified into a predetermined particle size group are filled in a cooling container, and then immersed in a coolant made of cold water so that the aggregate and the cold water exchange heat with each other. The cooling aggregate and then the cooling aggregate
After being transported to a plant, mixed with concrete materials such as cement and sand, and kneaded to produce concrete, concrete is placed.

[0004]

However, when cooling the aggregate as described above, it is difficult to discharge the cooling aggregate and the discharged cooling water in the vicinity of the cooling device. Conveying means for conveying the material, dehydrating means for the discharged cooling water, and the like are also arranged at positions separated from the cooling device. In particular, in order to cool a large amount of aggregates, it is not possible to make the arrangement of auxiliary devices such as a cooling device compact. For this reason, the above configuration becomes a major obstacle at a location point where there are restrictions such as topography.

The present invention has been made in order to solve the above-mentioned problems, and makes the arrangement of auxiliary devices such as a cooling device for the aggregate compact and makes the cooling aggregate and drainage directly from the aggregate bin. It is an object of the present invention to provide an aggregate cooling device that can be separated into cooling water and dehydrated to enable continuous operation, and an operating method thereof.

[0006]

In order to achieve such an object, according to the present invention, cooling water is supplied in a plurality of aggregate bottles arranged to receive, store and discharge the sized aggregates, respectively. An aggregate cooling device for cooling aggregate by heat exchange, wherein the top of the above-mentioned aggregate bin has an open end and cooling water sprinkling means is provided, and the bottom has a closed end, and the aggregate and drainage are cooled. A cooling water discharge port is provided, and the discharge port is provided with a discharge feeder for separating and dehydrating the cooling aggregate and the discharged cooling water by a partition plate provided therein. In addition, each of the sized aggregates,
An aggregate having a structure in which the aggregate is cooled by heat exchange with cooling water in a pair of aggregate bins for receiving, storing, and discharging, and the cooling aggregate and the discharged cooling water are separated and discharged. In the operating method of the cooling device, one of the aggregate bins is filled with the above aggregate, and then the aggregate is sprinkled by cooling water sprinkling to bring it into a cooling state, and then the cooling water sprinkling is stopped and the aggregate is left alone. After cooling, continue to fill the other aggregate bottle with the above aggregate, then sprinkle cooling water to sprinkle the aggregate to cool it, then stop the cooling water sprinkling and leave the aggregate Characterized by operating in alternating operation states in a pair of aggregate bins, in which cooling aggregates and waste cooling water that have been left to cool in a cooling state are separated, dehydrated and discharged from the aggregate bins Is.

[0007]

In this way, the sizing aggregate is filled into one of the pair of aggregate bins by filling the aggregate in one aggregate bin and sprinkling the cooling water from the top. The aggregate is cooled by spraying heat with the cooling water to cool it, and then the cooling water is stopped, and the aggregate is left in the cooling state by heat exchange with the cooling water to continue cooling. In the above process, the discharged cooling water is discharged through the stopped discharge feeder.

Subsequently, in the other aggregate bin, the same operations of filling aggregate, sprinkling cooling and leaving cooling are performed as in the case of one aggregate bin, and left in one aggregate bin for cooling. The cooled aggregate is discharged from the aggregate bin under the operation of the discharge feeder.

In the above process, the cooling water attached to the cooling aggregate is substantially separated. Further, the cooling aggregate that has been left uncooled and separated from the cooling water is discharged from the other aggregate bottle under the operation of the discharge feeder. As described above, the aggregates are operated in alternate operation states in a pair of aggregate bins, and each aggregate of a plurality of sizing particle size groups is also alternated in another pair of aggregate bins. The aggregate is operated in an operating state, and the above-described cooling operation is performed on all aggregates classified into a predetermined particle size group in the aggregate production plant, and the aggregates are transported to the batcher plant as cooled aggregates to produce mass concrete. Done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a systematic diagram of an aggregate cooling device to which an embodiment of the aggregate bin according to the present invention is applied, and FIG. 2 is a schematic view of the essential parts of a discharge feeder used in the embodiment of the present invention. 3 is a sectional view taken along the line III-III in FIG.

Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, a plurality (A to E) of combinations of a pair of aggregate bins are shown, but the number is not particularly limited, and the aggregate of aggregates classified into a predetermined particle size group in an aggregate production plant is shown. It corresponds to the number of sized particles, and is practically about 5 pairs.

In the configuration of FIGS. 1 and 2, the column A will be described, but the same applies to the columns B ... E. The aggregate bins 10 and 10A are paired, and the aggregates sized in the aggregate production plant are received and filled from the open end at the top of the aggregate bins 10 and 10A by the transporting means (not shown) and stored. .

Reference numeral 36 denotes a water supply pipe, which is a branched on-off valve 3
4, cooling water is supplied through the sprinkling means 38 to the aggregate bottle 10,
It is supplied from the top of 10A and heat-exchanged with the aggregate in the bottle to cool the aggregate, thereby obtaining cooled aggregate.

The bottoms of the aggregate bottles 10 and 10A are closed ends, and the cooling aggregate and the discharge port 13 for the discharged cooling water are provided.
Reference numeral 14 denotes a bottom chute, which is connected to the discharge feeder 12 via an opening / closing gate 16 and is further connected to a conveying means 22 via an outlet chute 18.

As the discharge feeder 12, for example, a vibrating feeder is suitable. Under the operation of the discharge feeder 12, only the cooling aggregate 24 is discharged, and it is conveyed to a batcher plant (not shown) by the conveying means 22 and the mass is discharged. Concrete production takes place.

In the aggregate bins 10 and 10A, when the aggregate is in a sprinkling-cooled state and in an abandoned state, the discharge feeder 1
2 is deactivated, the waste cooling water is separated and the discharge pipe 2
After passing through 0, it is joined to the collective discharge pipe 26, reaches the water treatment means 28, and is treated into the recovery material 30 and the overflow water 32,
Each reaches the next step. A gear mechanism 17 is provided on the back surface of the opening / closing gate 16, and the gear mechanism 17 operates to open and close as indicated by A.

In the above-described aggregate cooling device, a control device (not shown), for example, a microprocessor or a sequence control device, is used, the corresponding control programs are stored in the storage device, and the aggregate is received and opened / closed in accordance with the program. A command signal is generated for the valve, the discharge feeder, the conveying means, etc., and the above-mentioned operations such as starting and stopping of the number of devices are executed automatically by the command and manually by the command. As a result, the aggregate cooling device is operated while maintaining the desired cooling performance.

The discharge feeder 12 is, as shown in FIG.
A partition plate 42 including side plates 40, a bottom plate 46, and the like, and a partition plate 42, for example, a sieving plate, defines the partition plate 42 in the height direction inside the discharge feeder 12. 48 is a partition plate 42
Is a support base 48 for supporting the above on the bottom plate 46. Further, at the bottom of the bottom plate 46, there is a supporting base 48 which is composed of an inclined surface for exhaust cooling water.

Further, the bottom plate 46 is provided at its bottom with a water collecting portion 50 composed of an inclined surface for the discharged cooling water, and at the lowest part is provided with a water collecting port 52, which is a drain pipe. Connected to 20. Then, the discharged cooling water is separated and dehydrated from the cooling aggregate by the partition plate 42 while the discharge feeder 12 is stopped, and is moved to the water pipe 20 side and discharged.
When the discharge feeder 12 is in operation, the aggregate bin 1
Cooled aggregate from 0,10A travels on the partition plate 42,
It moves to the exit chute 18 side and is discharged.

Next, an embodiment relating to the method of operating the aggregate cooling device of the present invention will be described. Prior to the operation, the opening / closing gate 16 is opened under the adjustment of the transportation amount, and the discharge feeder 12 and the conveying means 22 are stopped.

In one of the pair of aggregate bins 10 and 10A, one aggregate bin 10 is supplied with aggregates sized by a conveying means (not shown) from the top and filled in the entire inner volume. After completion of the filling, the on-off valve 34 is opened to supply the cooling water from the supply pipe 36 through the water sprinkling means 38, and the water sprinkling of the cooling water flows through the surface of the aggregate and flows toward the bottom to cause the aggregate to flow. The cooling action of the aggregate is started by heat exchange between the surface and the cooling water, and the cooling action in the sprinkling cooling state is performed within a desired cooling time.

When the cooling time elapses, the on-off valve 3
4 is closed to stop the sprinkling of cooling water, the aggregate that was in the sprinkling cooling state is transferred to the standing cooling state as it is, and is used for heat exchange with the cooling water that occupies the aggregate surface and voids. The cooling action of the aggregate is continued, and the cooling action in the standing cooling state is performed under a desired cooling time, that is, until a cooled aggregate having a desired temperature is obtained.

In the above cooling process, the discharged cooling water heated by heat exchange is discharged from the bottom chute 14 of the aggregate bin 10 while the discharging feeder 12 is stopped.
It passes through the second partition plate 42, is discharged to the water collecting port 52 without accompanying the cooling aggregate, is sent to the water treatment means 28 via the discharge pipe 20 and the collecting and discharging pipe 26, and is the collected material 30 and the treated water 32. The water is treated so that

Subsequent to the cooling action of the aggregate in the above-described left-standing cooling state being started, the other aggregate bin 10A is the same as the one aggregate bin 10 described above. Is supplied from the top and filled. Hereinafter, the operation of the cooling cycle of the aggregate, which starts with the supply of the cooling water, is as described above, and thus the redundant description will be omitted.

Next, in one of the aggregate bins 10, the cooling water is separated after the standing cooling state is completed and the cooling water is separated into cooling aggregates. It is operated, discharged from one aggregate bin 10, passes through the partition plate 42 of the discharge feeder 12, and the cooled aggregate is conveyed by the conveying means 22 through the outlet chute 18 to the batcher plant which is the next step.

After the discharge of the cooling aggregate is completed, the discharge feeder 12 is stopped. Subsequently, with respect to the other aggregate bin 10A, the cooling aggregate is discharged by operating the discharge feeder 12 '.
At 0 and 10 A, the cooling of the aggregate is performed in an alternating manner. Further, in rows B ... E, the cooling operation described above is performed for all the aggregates sized in the predetermined particle size group in the aggregate production plant in the alternating operation state and sequentially. The cooled aggregate is transported to the batcher plant, where mass concrete is produced.

[0027]

As is apparent from the above description, according to the present invention, when cooling a large amount of aggregate, the arrangement of auxiliary devices such as an aggregate cooling device can be made compact. Thus, the cooling aggregate and the discharged cooling water can be directly separated from the aggregate bottle. In addition, the aggregate production plant, the aggregate cooler, the batcher plant operating parameters, and the properties of the aggregate and the cooling water can be effectively cooled according to the properties of the aggregate. .

[Brief description of drawings]

FIG. 1 is a system diagram of an aggregate cooling device to which an embodiment of an aggregate bin according to the present invention is applied.

FIG. 2 is a configuration diagram of a main part of a discharge feeder used in an embodiment of the present invention.

3 is a sectional view taken along the line III-III in FIG.

[Explanation of symbols]

 10, 10A Aggregate bottle 12, 12 'Discharge feeder 13, 13' Discharge port 38, 38 'Sprinkling means 42 Partition plate

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Noriyuki Nakagawa 1780 Uetakano, Yachiyo-shi, Chiba Kawasaki Heavy Industries, Ltd. Yachiyo factory (72) Inventor Toshihide Kamase 1780 Uetakano, Yachiyo-shi, Chiba Kawasaki Heavy Industries Ltd. Company Yachiyo factory

Claims (2)

[Claims] 1. An aggregate cooling device for cooling an aggregate by heat exchange with cooling water in a plurality of aggregate bins arranged to receive and store and discharge the sized aggregate respectively. The top of the aggregate bottle has an open end and a cooling water sprinkler is provided, and the bottom has a closed end and a cooling aggregate and an outlet for discharging cooling water are provided, and the outlet has a cooling bone. A cooling device for an aggregate, characterized in that a discharge feeder for separating, dehydrating and discharging the material and the discharged cooling water by an internal partition plate is attached. 2. The aggregate is cooled by heat exchange with cooling water in a plurality of aggregate bins each of which receives and stores and discharges the sized aggregate, respectively. In a method of operating an aggregate cooling device configured to separate and discharge water, in one aggregate bottle, the above aggregate is filled, and then the aggregate is brought into a sprinkling and cooling state by sprinkling cooling water. After stopping the sprinkling of cooling water to leave the aggregate in a standing cooling state, and then filling the other aggregate in the other aggregate bin, and then sprinkling cooling water to bring the aggregate into a sprinkling cooling state In a pair of aggregate bottles, stop cooling water sprinkling and use the aggregate as a cooling device. Operation of an aggregate cooling device characterized by operating in alternating operating states Law.