JP3191863B2 - Concrete manufacturing method and concrete manufacturing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete manufacturing apparatus provided with a facility for precooling aggregates such as sand and gravel, which are raw materials of concrete, and a concrete manufacturing apparatus.

[0002]

2. Description of the Related Art As an aggregate pre-cooling equipment used in a concrete manufacturing apparatus, for example, an aggregate cooling apparatus using a vaporization cooling method as shown in FIG. 4 is used (Japanese Patent Laid-Open No. Hei 8-112812). No.). The aggregate cooling device 1 supplies a low-temperature, low-humidity airflow to the cooling device main body 2 from an air supply port 3 provided near a lower end portion of the tower-shaped cooling device main body 2, and is also sent from the transfer device 4. The aggregate 5A is fed from an aggregate input hopper 6 provided at the upper end of the apparatus main body 2, and the aggregate is collided and dispersed by a dispersing device 7 provided in an aggregate drop passage of the apparatus main body 2. 5A is cooled by a vaporization cooling method. The cooled aggregate 5A is provided at a lower end portion of the cooling device main body 2 and cut out by a cutout hopper 8, and is sent to a batcher plant (not shown) by a transfer device 9 for cement or the like. Kneaded with water, admixture, etc. The dispersing device 8 includes a plurality of rotatable round bar-shaped cushioning members 10 extending in the horizontal direction, and a scraper member disposed immediately below the cushioning members 10 for removing adhesion of the aggregate 5A to the cushioning members 10. 11 are arranged in a plurality of stages such that the length directions of the cushioning members 10 are alternately perpendicular to the vertical direction of the apparatus main body 2. Further, in the figure, reference numeral 12 denotes an air discharge port, and reference numeral 13 denotes an air supply device. In the evaporative cooling method, a low-temperature, low-humidity air flow is sent to the aggregate to vaporize moisture (surface water) attached to the surface of the aggregate, and the surface water is vaporized from the aggregate when the surface is vaporized. To cool the aggregate.

[0003]

However, in the above-mentioned conventional example, a method of controlling the aggregate cooling device so that the aggregate cooled to the target cooling temperature can be supplied according to the production speed of the concrete is clearly described. Had not been. In other words, pre-cooling of the aggregate requires not only controlling the temperature of the aggregate after being cooled to a constant value, but also controlling the supply amount of the aggregate to be pre-cooled according to the production speed of the concrete, and Although it is necessary to manage the aggregate cooling device so as not to produce excessive stock, no concrete manufacturing device or method has been proposed.

[0004] The present invention has been made in view of the conventional problems, and a method and a method for producing concrete capable of precooling an aggregate to a target temperature in accordance with the concrete production speed and transporting the aggregate to a batcher plant. It is intended to provide a device.

[0005]

According to a first aspect of the present invention, there is provided a method for producing concrete, comprising measuring a surface water content of an aggregate to be charged and a temperature of the aggregate after being cooled, and measuring the measured surface. Based on the water rate data and the temperature data and the target production speed of the concrete, the cutout amount of the aggregate to be charged and the air volume of the blast air so as to secure the supply amount of the aggregate cooled to the target cooling temperature. It is characterized by controlling any one of the temperature of the blown air.

In addition, the method for producing concrete according to claim 2 is based on the data of surface water content of the aggregate to be charged, the temperature data of the aggregate after being cooled, and the target production speed of the concrete. The method is characterized in that the humidity is controlled.

According to a third aspect of the present invention, there is provided a concrete manufacturing apparatus comprising: a surface water measuring device for measuring a surface water content of the aggregate to be charged; and a temperature detector for measuring a temperature of the cooled aggregate. Along with disposing in the aggregate cooling device, based on the measured surface water rate data and temperature data and the target production speed of concrete, the supply amount of the aggregate cooled to the target cooling temperature is ensured. And an aggregate cooling device control means for controlling any one of the cutout amount of the aggregate to be charged, the air volume of the blast air, and the temperature of the blast air.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, portions common to the conventional example will be described using the same reference numerals. FIG. 1 is a schematic configuration diagram of a concrete manufacturing apparatus according to an embodiment of the present invention. The aggregate cooling device 1 according to the present embodiment mainly cools fine aggregate (sand). In the figure, 1 is an aggregate cooling device, 4 is a conveying path for supplying fine aggregate (sand) 5 to the aggregate cooling device 1, and 9 is a fine aggregate (sand) 5 discharged from the aggregate cooling device 1. Transport path,
14 is a batcher plant for producing concrete, 15
Transports the fine aggregate 5 cooled by the aggregate cooling device 1 to the transport path 9
From the bucket elevator to the batcher plant 14. Further, a surface water measuring device 16 for detecting the amount of surface water of the supplied aggregate 5 is installed at the upper end of the aggregate cooling device 1 and below the aggregate input hopper 6. A temperature detector 17 is installed inside the aggregate cutting hopper 8 at a lower end of the cooling sand storage chamber 18 in the batcher plant 14 to store the amount of fine aggregate stored in the cooling sand storage chamber 18. A level detector 19 for measurement is provided. The aggregate cooling device control means is provided in a control room of a concrete manufacturing device (not shown).
6, the respective detection signals from the temperature detector 17 and the level detector 19 are input to the aggregate cooling device control means.

Next, the operation of the concrete manufacturing apparatus will be described. Aggregate 5 sent from transport device 4
Is cooled by the low-temperature and low-humidity air flow sent from the air supply port 3 while being impinged and dispersed by the dispersing device 7 from the aggregate input hopper 6 of the aggregate cooling device 1 and cut out. Batcher plant 1 is cut out by hopper 8 and transported by transfer device 9 through bucket elevator 15.
4 In the batcher plant 14, the cooled aggregate is kneaded with cement, water, an admixture, and the like, and discharged as concrete. FIG. 2 is a basic flowchart showing a control method of the aggregate cooling device. First, the temperature T of the cooled fine aggregate 5 is measured by the temperature detector 17 installed inside the aggregate cutting hopper 8 (step S2).
1). In general, in the pre-cooling of fine aggregate (sand), assuming that the temperature at the time of concrete kneading in the batcher plant 14 is _Tc , the target cooling temperature T ₀ of the fine aggregate (sand) having a large surface area is as follows. Temperature T lower than T ₀
Set to _c . Next, the measured temperature T of the fine aggregate 5 is sent to an aggregate cooling device control means of a concrete manufacturing device (not shown), and is compared with a preset target cooling temperature T ₀ (step S22). On the other hand, by the surface water measuring device 16,
The surface water rate R of the fine aggregate 5 is measured (step S23), and the production speed V of the cooled fine aggregate accumulated in the cooling sand storage room 18 in the batcher plant 14 by the level detector 19 is measured. _k is measured (step S2
4) The measurement data R and _Vk are also sent to the aggregate cooling device control means. Operating the operator of the concrete manufacturing apparatus manipulates the aggregate cooling apparatus control unit, concrete production rate and the respective data T, R, with reference to the V _k Overall the current control state of aggregate cooling device 1 Judgment is made (step S25), the temperature T of the fine aggregate 5 is set to the target cooling temperature T _0, and the cut amount of the fine aggregate, the temperature and the humidity of the supply air are set so that the production speed of the concrete becomes the target production speed. Then, an instruction to adjust the air volume is issued, and the aggregate cooling device 1 is controlled (step S26). When the surface water rate R of the fine aggregate 5 exceeds a preset surface water rate threshold R ₀ , that is, when the heat capacity of the fine aggregate 5 is large,
Since the heat exchange effect between the blast air and the fine aggregate is reduced, control is performed to reduce the amount of the fine aggregate cut out, and the fine aggregate 5 is removed.
When the surface water rate R is equal to or less than the surface water rate threshold R ₀ ,
Control is performed such that the cutout amount of the fine aggregate is unchanged or reduced.

FIG. 3 shows a case where there is a margin in the production speed V _k of fine aggregate with respect to the target production speed of concrete, and therefore, even if the amount of cut fine aggregate is reduced, there is no problem in the supply of concrete. 6 is a flowchart showing an example of a control method performed. First, compared with the first set temperature T ₁ higher than the temperature T and the target cooling temperature T ₀ of the cooled fine aggregate 5 (step S31). If T> T _1, compared with the surface water ratio R and the surface water rate threshold R ₀ fine aggregate 5 (step S3
2) If R> R _{0, the} cooling is insufficient and the surface water content is high, so the cut-out amount is reduced and the temperature and humidity of the supply air are reduced to increase the air flow (step S32). Step S
32, if R <R _0, the temperature and humidity of the supply air are reduced and the flow rate is increased while the cutout amount is unchanged (step S3).
3). If T <T _1, and compares the set temperature T ₂ second lower than the temperature T and the target cooling temperature T ₀ of the cooled fine aggregate 5 (step S35). If T <T _2, compared with the surface water ratio R and the surface water rate threshold R ₀ fine aggregate 5 (step S3
6) If R> _{R0, the} cooling is excessive and the surface water content is high, so the cut-out amount is reduced and the temperature of the supply air is raised (step S37). In step S36, R
If <R _0, only the temperature of the supply air is increased without changing the cutout amount (step S38). If T ₂ <T <T ₁ , the temperature T of the cooled fine aggregate 5 is within the target temperature range, so that the cooling condition is maintained as it is (step S37).

In the limited case described above, the temperature of the cooled fine aggregate 5 and the measured value of the surface water rate R of the fine aggregate 5 are compared with target values, respectively, to thereby control the aggregate cooling device control means. Can automatically control the aggregate cooling device 1.
In the case where the target production speed of concrete is not fixed, for example, the operator of the concrete production device operates the above T, T according to the target production speed of concrete at the present time.
R, comprehensively determines the data of V _k, for controlling the aggregates cooling device 1 operates the aggregate cooler control unit. For example, even if the cooling data of the aggregate is satisfied such that the measured data is T = T ₀ , R <R ₀ , if the target production speed of concrete is to be increased, the production speed V _k of the fine aggregate is changed. Since it is necessary to increase the amount of fine aggregate cut out,
The aggregate cooling device 1 is controlled so as to lower the temperature and humidity of the supply air and further increase the flow rate of the supply air. Alternatively, when the production of concrete is suspended, not only the supply of fine aggregate is suspended, but also the temperature, humidity and air volume of the supply air are controlled based on the waiting time until the start of the next concrete production. The inside of the cooling device main body 2 is maintained at an appropriate temperature and humidity, and the aggregate cooling device 1 is controlled so that the temperature of the fine aggregate becomes an appropriate temperature from the start of the supply at the start of the next production. In particular, since the temperature of the fine aggregate to be supplied may become high in the summer, by performing the above-described control, the aggregate cooled to the target temperature from the next production start can be promptly supplied. Can be.

[0012] Thus, according to this embodiment, the surface water ratio R of fine aggregate to be introduced, the temperature T of the cooled fine aggregate, each of the production speed V _k of the cooled fine aggregate The data was evaluated based on the concrete production speed, and the cut-out amount of the fine aggregate 5 to be charged and the temperature, humidity and air volume of the blast air were controlled, so that the temperature was cooled to the target temperature according to the concrete production amount. The fine aggregate thus obtained can be sent to the batcher plant 14. In addition, since it is possible to prevent excess stock from being produced, the concrete manufacturing apparatus can be operated efficiently.

In the present embodiment, the surface water rate R of the supplied aggregate and the temperature T of the cooled aggregate are used as the measurement data. By installing a vessel, for example, if the surface water rate of the cooled fine aggregate is large, reduce the humidity of the supply air and increase the air volume, such as by increasing the surface water rate of the cooled fine aggregate Control may be performed to further correct the temperature, humidity, and air volume of the supply air. In addition, the aggregate input hopper 6
A temperature detector may also be installed in the inside, and control may be performed such that the temperature and humidity inside the cooling device main body 2 before and after the introduction of the aggregate are increased or decreased according to the temperature of the fine aggregate before the introduction. .

[0014]

As described above, the concrete manufacturing method according to the first aspect measures the surface water content of the aggregate to be charged and the temperature of the aggregate after being cooled. Based on the surface water rate data and the temperature data and the target production rate of concrete, the cut-out amount of the aggregate to be charged and the blast air so as to secure the supply amount of the aggregate cooled to the target cooling temperature. Since either the air volume or the temperature of the blast air is controlled, it is possible to accurately supply the required amount of cooling aggregate for the concrete production, and not to create excessive stock. Therefore, the cooled concrete can be efficiently produced.

Further, according to the concrete manufacturing method of the present invention, the supply amount of the aggregate cooled to the target cooling temperature based on the measured surface water content data and the temperature data and the target production speed of the concrete. Therefore, the humidity of the blown air is controlled so as to ensure the above, so that the vaporization and cooling efficiency of the aggregate can be further improved, and the aggregate can be efficiently cooled.

The concrete manufacturing apparatus according to a third aspect of the present invention includes a surface water measuring device for measuring the surface water content of the aggregate to be supplied and a temperature detector for measuring the temperature of the cooled aggregate. In the aggregate cooling device, and based on the measured surface water rate data and temperature data and the target production speed of concrete, to ensure the supply of aggregate cooled to the target cooling temperature Since there is provided an aggregate cooling device control means for controlling any of the cut-out amount of the aggregate to be charged, the air volume of the blast air, and the temperature of the blast air, concrete is reliably produced at the target production speed. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a schematic configuration diagram of a concrete manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation management method of the aggregate cooling device according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating an example of an operation management method of the aggregate cooling device according to the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional aggregate cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aggregate cooling device 2 Cooling device main body 3 Air supply port 4, 9 Transport device 5 Aggregate 6 Aggregate input hopper 7 Dispersion device 8 Cut-out hopper 10 Buffer material 11 Scraper member 12 Air outlet 13 Air supply device 14 Batcher plant 15 Bucket elevator 16 Surface water meter 17 Temperature detector 18 Aggregate storage room 19 Level detector

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Heiji Doi 3174 Showa-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Ishikawajima Construction Machinery Co., Ltd. (72) Osamu Chisaka 3174 Showa-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Ishikawajima Construction Machinery (58) Investigated field (Int. Cl. ⁷ , DB name) B28C 7/00

Claims (3)

(57) [Claims] An aggregate supplied in a predetermined cut-out amount is dispersed and dropped in an air flow blown at a predetermined temperature, and the aggregate is cooled by a vaporization cooling method. In a concrete manufacturing method for manufacturing concrete by kneading cement or the like, the surface water rate of the aggregate supplied and the temperature of the cooled aggregate are measured, and the measured surface water rate data And, based on the temperature data and the target production speed of the concrete, so as to secure the supply amount of the aggregate cooled to the target cooling temperature, so that the cut amount of the aggregate to be charged, the air volume of the blast air, and the blast air A method for controlling one or more or all of the temperature of the concrete. 2. The humidity of the blown air is controlled on the basis of the surface water content data of the supplied aggregate, the temperature data of the cooled aggregate, and the target production speed of concrete. Item 7. A method for producing concrete according to Item 1. 3. An aggregate cooling device for dispersing and dropping an aggregate supplied in a predetermined cutout amount into an air flow blown at a predetermined temperature to cool the aggregate by a vaporization cooling method, and the cooled aggregate. In a concrete manufacturing apparatus provided with a batcher plant for kneading aggregate and cement or the like and discharging as concrete, a surface water measuring device for measuring a surface water rate of the input aggregate, and an aggregate after being cooled And a temperature detector for measuring the temperature of the aggregate cooling device,
Based on the measured surface water rate data and temperature data and the target production rate of concrete, the cut-out amount of the aggregate to be charged and the above-mentioned amount of the aggregate to ensure the supply amount of the aggregate cooled to the target cooling temperature. An apparatus for manufacturing concrete, comprising: an aggregate cooling device control means for controlling one or more or all of the air volume of the blast air and the temperature of the blast air.