JPH0780174B2 - Raw concrete manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing ready-mixed concrete by cooling or heating aggregate to adjust the kneading temperature of ready-mixed concrete.

[0002]

2. Description of the Related Art Green concrete is not good either if the temperature is too high or, on the contrary, too low. If the temperature is too high, thermal expansion causes cracks in the cured state. In order to prevent this adverse effect, a technique for cooling concrete in hot weather has been developed. In particular, the characteristics of concrete to be poured when the daytime temperature exceeds 25 ° C. can be improved by cooling. Summer hot concrete has a drawback that the slump value becomes low with the passage of time, cracks occur when it is hardened by thermal expansion, and the strength after hardening is also lowered.

The slump drop of ready-mixed concrete occurs due to the evaporation of water. When the slump is lowered, the driving becomes difficult. Fresh concrete with reduced slump
It is necessary to add cement paste and knead again. Furthermore, ready-mixed concrete has a characteristic that the slump decreases as the temperature rises even if the amount of water added is adjusted to be the same.

The cracks formed when concrete is hardened in the heat are caused by heat. The hydration reaction in which concrete hardens is an exothermic reaction. When the inside is heated by the reaction heat, a temperature difference occurs between the inside and the outside of the concrete. The warmed interior thermally expands, and the cooled exterior surface shrinks and cracks. Cracking of concrete causes significant adverse effects in all applications. It causes fatal damage to large-scale structures such as dams, bridge piers installed in the sea, and bulkheads of nuclear reactors.

Further, hot concrete has a drawback that its strength upon hardening is also lowered. In order to lower the kneading temperature of ready-mixed concrete, a device for cooling added water or cement has been developed. Since the amount of water added to the device for cooling water is small, the temperature of green concrete cannot be lowered so much. A device that blows liquefied nitrogen gas into cement and forcibly cools it has a significantly high running cost.

An apparatus for cooling ready-mixed concrete is described in JP-A-62-122709. This device
The pipe that transports ready-mixed concrete is forcibly cooled with liquefied gas. This device is difficult to quickly cool ready-mixed concrete. This is because it is difficult to increase the contact area between the ready-mixed concrete and the pipe.

Among the materials added to concrete, the material having the highest weight ratio is aggregate. Cooling the aggregate
Most effective in reducing the temperature of ready-mixed concrete.
To achieve this, aggregate cooling devices have been developed. This device is described in JP-A-57-188317. The apparatus described in this publication cools the aggregate by the heat of vaporization of water adhering to the surface. In order to evaporate the surface water, the aggregate is put in a closed tank, the closed tank is evacuated, the boiling point is lowered to forcibly evaporate the water, and the heat of vaporization of water cools the aggregate. The apparatus for cooling the aggregate in this way requires a large pressure tank and a large-capacity vacuum pump, which increases the equipment cost. In addition, the aggregate cannot be cooled continuously, which results in batch processing.

As an apparatus for continuously cooling the aggregate, there is an apparatus for spraying liquefied nitrogen gas onto the aggregate to cool it.
-156045, JP-A-1-26407,
And JP-A-1-26408. Japanese Patent Laid-Open No. 63-154305 discloses an apparatus for spraying liquefied nitrogen gas onto an aggregate to freeze the surface water to form an ice layer on the surface of the aggregate. The devices described in these publications can cool the aggregate to a low temperature. However, since a large amount of liquefied nitrogen gas is consumed, the running cost is high and it can only be used for special purposes. When actually using this type of device, it is very important to reduce the running cost. This is because the amount of liquefied nitrogen gas consumed is enormous because it is used when constructing a large plant.

The present inventors have developed a device for cooling aggregates with cold water in order to solve these drawbacks (Japanese Patent Laid-Open No. Hei 3).
-65309 publication). The device described in this publication is
A belt conveyor for cooling the aggregate by immersing the aggregate in the cold water of the cooling water tank is provided. The cold water stored in the cooling water tank is cooled by the cooling means.

[0010]

This device can cool the aggregate to a precise temperature. Therefore, there is a feature that concrete can be cooled to a low temperature in the heat. However, the apparatus for producing ready-mixed concrete is not limited to use in the heat. Even at construction sites that need to be cooled during the heat,
In winter, it is necessary to heat to prevent freezing. Devices that cannot heat ready-mixed concrete cannot be used when the outside air temperature is below 0 ° C.

This adverse effect can be eliminated by using a mixer for heating the fresh concrete. JP 59-38014 A describes a mixer for heating a drum for kneading green concrete. Further, Japanese Utility Model Laid-Open No. 1-22405 describes an apparatus for injecting heating steam into fresh concrete to heat it. By heating the aggregate with the devices described in these publications, it is possible to prevent freezing of concrete in winter.

However, it is difficult for the device for heating the drum of the mixer to heat the fresh concrete to an appropriate temperature in a short time. This is because the contact time between the drum and green concrete is short. A device that injects heated steam into fresh concrete
Steam can heat fresh concrete in a short time. However, since steam is mixed into the fresh concrete, the moisture content of the fresh concrete changes. If the amount of steam injected is constant, the amount of water mixed in the ready-mixed concrete can be adjusted. However, since the injection amount of steam changes depending on the temperature of the fresh concrete, it is difficult to reduce the amount of water added to the fresh concrete in consideration of the addition amount of steam.

Further, a device for heating the aggregate has been developed. A device of this type is described in Japanese Patent Publication No. 53-42336. The device described in this publication supplies aggregate to a cylindrical pipe, arranges a heating shaft for heating with steam inside the pipe, fixes a heat transfer plate to the heating shaft, and connects the heat transfer plate to the bone. Heat the material by touching it. With this device, it is difficult to uniformly heat the entire aggregate to the set temperature in a short time. This is because the heat transfer plate is brought into contact with the aggregate to heat it. It is important for the aggregate heating device to heat the aggregate to an accurate temperature. This is because if the heating temperature is too high, the heat energy consumed for heating will increase, and if it is too high, the reaction heat will heat the concrete when it hardens, and cracks will occur when it shrinks. Further, although this type of device can be used to heat the aggregate, the equipment cost of the device is considerably high, and a huge capital investment is required to heat the aggregate.

The present invention was developed with the object of resolving this drawback, and an important object of the present invention is to cool or heat the aggregate uniformly to the set temperature in a short time, and An object of the present invention is to provide an apparatus for producing ready-mixed concrete, which can control the kneading temperature of ready-mixed concrete, which can significantly reduce the equipment cost for heating.

[0015]

An apparatus for producing ready-mixed concrete according to the present invention has the following constitution in order to achieve the above-mentioned object. The apparatus for producing ready-mixed concrete of the present invention comprises a mixer 1 for adding aggregate to cement and kneading, a cooling water tank 2 for storing a liquid for immersing and cooling the aggregate supplied to the mixer 1, and a cooling water tank 2. Immersion transfer means 4 for immersing the aggregate in the liquid and carrying it out, cooling means 14 for cooling the liquid in the cooling water tank 2, and cooling means 1 by detecting the liquid temperature in the cooling water tank 2.
4 and a temperature sensor 6 that controls the temperature sensor 4. Immersion transfer means 4
Is configured to immerse the aggregate in the cooling water tank 2, cool the aggregate with the liquid in the cooling water tank 2, and supply the aggregate to the mixer 1.

Further, in the apparatus for producing ready-mixed concrete of the present invention, heating means 5 is connected to the cooling water tank 2. The heating means 5 heats the liquid in the cooling water tank 2 and immerses the aggregate in the heated liquid to heat it. That is, in the apparatus for producing ready-mixed concrete of the present invention, the cooling water tank 2 is also used as the aggregate heating water tank.

Further, in the fresh concrete producing apparatus according to the second aspect of the present invention, the cooling water tank 2 is provided with the stirring means 3, and the stirring means 3 forcibly stirs the liquid in the cooling water tank 2. The device that stirs the liquid adheres to the aggregate and cools the water tank 2
The fine-grained components carried in can be attached to the surface of the aggregate again and discharged.

Furthermore, in the apparatus for producing ready-mixed concrete according to the third aspect, the cooling means 14 cools the cooling heat exchanger 15 for circulating the liquid in the cooling water tank 2 and the cooling heat exchanger 15. The forced cooling device 16 is used as the heating means 5, and the steam injection pipe 7 is provided at the bottom of the cooling water tank 2.
The steam injection pipe 7 is composed of a steam boiler 8 that supplies heated steam. The steam injection pipe 7 injects heated steam into the liquid in the cooling water tank 2 to heat the liquid and stir the liquid.
The aggregate is immersed in a liquid heated to a set temperature by heating steam and heated.

[0019]

In the apparatus for producing ready-mixed concrete of the present invention, the liquid in the cooling water tank 2 is cooled by the cooling means 14, the aggregate is immersed in this liquid to cool it to a predetermined temperature, and the cooled aggregate is fed to the mixer 1. Supply it to make ready-mixed concrete. The aggregate is cooled when kneading the concrete in the heat. The ready-mixed concrete in which the cooled aggregate is kneaded has a low curing temperature and cracks due to thermal expansion are prevented.

In the winter, the liquid in the cooling water tank 2 is heated by the heating means 5 instead of being cooled. The apparatus of the present invention adjusts the aggregate to a set temperature by immersing it in a liquid. When the aggregate is immersed in the cooled and cooled liquid, it is cooled, but when it is immersed in the heated liquid, the aggregate is heated to the set temperature. The only member required for heating the aggregate is the heating means 5 for heating the liquid in the cooling water tank 2. This is because the cooling water tank 2, the immersion transfer means 4, and the mixer 1 are used together. Therefore, the apparatus for producing ready-mixed concrete of the present invention is to limit the cost increase, cool the ready-mixed concrete to a predetermined temperature,
It also has the feature that it can be heated. The apparatus of the present invention, which is capable of freely adjusting the temperature of the ready-mixed concrete by cooling or heating the aggregate, controls the ready-mixed concrete to an ideal temperature at any site without being affected by the temperature environment of the site where it is used. There is a feature that can be placed.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify a green concrete manufacturing apparatus for embodying the technical idea of the present invention, and the present invention does not specify the configuration of the green concrete manufacturing apparatus to the following. .

Further, in this specification, for easy understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims column", "action column", and "action column". It is added to the members shown in the section of "Means for Solving the Problems". However, the members shown in the claims are
It is by no means specific to the members of the examples.

The ready-mixed concrete manufacturing apparatus shown in FIG.
An aggregate and a mixer 1 for kneading cement, sand and water,
The cooling water tank 2 for cooling or heating the aggregate, the cooling means 14 for cooling the liquid in the cooling water tank 2, the heating means 5 for heating the liquid in the cooling water tank 2, and the aggregate being immersed in the cooling water tank 2 The immersion transfer means 4 for transferring, the stirring means 3 for stirring the liquid in the cooling water tank 2, and the liquid temperature in the cooling water tank 2 are detected, and the cooling means 14 or the heating means 5 is controlled to control the liquid temperature to a set value. The temperature sensor 6 is provided.

The mixer 1 comprises aggregates that have been cooled or heated,
All types that can knead sand, cement and water can be used.

The cooling water tank 2 is in the shape of an elongated gutter having an opening at the top. The cooling water tank 2 dips the aggregate and cools or heats it. The size of the cooling water tank 2 is determined by the amount of aggregate processed per unit time. Throughput of aggregate is 250 per hour
In case of tons, the cooling water tank 2 preferably has a width of 2
~ 3.5m, height 0.6 ~ 1.5m, length 5 ~ 15m.

The time required to cool or heat the aggregate varies depending on the size. Large aggregates require more time to cool or warm to the interior than smaller ones. Therefore, large-grain aggregates require a longer liquid immersion time. The total length of the cooling water tank 2 can be increased to lengthen the liquid immersion time of the aggregate. The cooling water tank 2 for heating large aggregates is
Increase the total length. For example, the cooling water tank 2 that processes 250 tons of aggregate of 5 to 150 mmφ per hour has a total length of 10
The cooling water tank 2 for treating aggregate of 5 to 40 mmφ has a total length of 5 to 8 m.

The liquid cooling means 14 includes a cooling heat exchanger 15 for cooling the cold water in the cooling water tank 2 and a cooling heat exchanger 15.
A forced cooling device 16 for supplying a liquefied refrigerant to the cooling water, and a circulation pump 9 for circulating cold water between the cooling heat exchanger 15 and the cooling water tank 2.

The cooling heat exchanger 15 cools the liquid circulated by the heat of vaporization that vaporizes the refrigerant. Cooling heat exchanger 1
5 circulates a dirty liquid in which fine particle components attached to the aggregate float. When the fine particle component accumulates in the liquid passage of the cooling heat exchanger 15, the heat exchange efficiency decreases. The cooling heat exchanger 15 shown in the figure has a structure in which the cold water pipe 15A, which is a cold water passage, is a straight pipe and can be easily cleaned. The cooling heat exchanger 15 has a plurality of cold water pipes 15A connected in parallel inside a casing 15B. Cold water pipe 15A
An airtight refrigerant chamber for vaporizing the refrigerant is provided outside the casing and inside the casing 15B. The refrigerant chamber is a forced cooler 16
Connected to.

The forced cooler 16 for supplying a cooling medium to the cooling heat exchanger 15 to cool it comprises a compressor 17, a condenser 18, and an expansion valve 19. Compressor 1
7 sucks the vaporized refrigerant from the cooling heat exchanger 15,
It is pressurized and sent to the condenser 18. The condenser 18 cools the pressurized refrigerant to liquefy it. The expansion valve 19 limits the amount of refrigerant supplied to the cooling heat exchanger 15 to lower the internal pressure. The refrigerant sent to the cooling heat exchanger 15 through the expansion valve 19 is expanded and vaporized in the low-pressure cooling heat exchanger 15 to remove heat of vaporization from the surroundings and cool the cold water pipe 15A. The liquid cooled in the cooling heat exchanger 15 is circulated in the cooling water tank 2 by the circulation pump 9. The operation of the compressor 17 is controlled by the temperature sensor 6. The temperature sensor 6 operates the compressor 17 when the liquid temperature becomes higher than the set value, and stops the operation of the compressor 17 when the liquid temperature becomes lower than the set value.

As the cooling water tank 2 is used, the fine particle components attached to the aggregate and carried in are deposited on the bottom. This is because the fine particle component that is attached to the aggregate and carried in is washed off with the liquid and settles on the bottom of the cooling water tank 2. In order to stir the fine particle component, the cooling water tank 2 needs the stirring means 3. In the apparatus shown in FIG. 1, the cooling means 14 is used together with the liquid stirring means 3. The liquid is circulated and stirred in the cooling means 14, and the fine particle components deposited on the bottom of the cooling water tank 2 are suspended in the liquid.

The cooling means 14 used in combination with the stirring means 3 is
The liquid is sucked from the right part of the cooling water tank 2, supplied to the left part, and stirred. The cooling water tank 2 causes the liquid to flow from left to right,
Transfer aggregate from right to left. The discharge side of the cooling water tank 2 (the left side in FIG. 1) is connected to the discharge side of the circulation pipe 10 for supplying the liquid. The bottom of the cooling water tank 2 on the supply side (the right side in FIG. 1) is connected to the suction side of the circulation pipe 10. Further, a water sprinkling pipe 11 for sprinkling the liquid is arranged above the cooling water tank 2. A flow rate adjusting valve 12 is connected to the discharge sides of the water spray pipe 11 and the circulation pipe 10 to adjust the amount of liquid discharged from the water spray pipe 11 and the circulation pipe 10. The circulation pipe 10 connecting the suction side to the bottom of the cooling water tank 2 is connected to the circulation pump 9. The circulation pump 9 sucks the liquid at the bottom of the cooling water tank 2 and circulates it to the discharge side of the cooling water tank 2 to stir the liquid and prevent fine particle components from accumulating on the bottom of the cooling water tank 2.

The liquid heating means 5 is a steam injection pipe 7 for injecting heating steam into the liquid in the cooling water tank 2 and a steam boiler 8 for supplying the heating steam to the steam injection pipe 7. The steam injection pipe 7 is piped at the bottom of the cooling water tank 2 so that the steam injection pipe is
The liquid heated by injecting the steam heated to 0 ° C. or higher. The heating means 5 having this structure can also be used in combination with the stirring means 3 for stirring the fine particle components that settle to the bottom. This is because the steam injection pipe 7 vigorously injects steam into the liquid at the bottom of the cooling water tank 2. The steam injected from the steam injection pipe 7 stirs the liquid to suspend the fine particle components deposited on the bottom of the cooling water tank 2 in the liquid. When the steam injection pipe 7 injects the heated steam toward the bottom of the cooling water tank 2, the liquid can be stirred particularly effectively and the fine particle components can be suspended in the liquid. However, even if the steam injection pipe 7 horizontally or upwardly injects the heated steam, the liquid can be agitated to suspend the fine particle components at the bottom in the liquid. That is because the heated steam agitates the liquid. In particular, the steam injection pipe 7 provided at the bottom of the cooling water tank 2 stirs the liquid in the cooling water tank 2 from the bottom and totally stirs it to suspend fine particle components in the liquid. The fine particle component suspended in the liquid is reattached to the surface of the aggregate discharged from the cooling water tank 2 and discharged.

As described above, the apparatus in which the heating means 5 is used together with the stirring means 3 does not necessarily require the liquid stirring means 3. However, the liquid is agitated by the vapor injection pipe 7, and further, as shown in FIG. 1, the cooling means 14 sucks the liquid at the bottom of the cooling water tank 2 and circulates the liquid in the cooling water tank 2 and the liquid. Can also be stirred. When the heating means 5 heats the liquid, the cooling means 14 operates the circulation pump,
The forced cooler 16 is not operated. This is because it is not necessary to cool the cooling heat exchanger 15. Cooling means 1 shown in this figure
4 sucks the liquid from the right part of the cooling water tank 2, supplies it to the left part, and stirs it. The cooling water tank 2 causes the liquid to flow from left to right and transfers the aggregate from right to left.

The apparatus for producing ready-mixed concrete of the present invention does not specify the heating means 5 as the steam injection pipe 7 or the steam boiler 8.
An electric heater arranged at the bottom of the cooling water tank or a heat exchanger for circulating the steam of the steam boiler can be used as the heating means. An electric heater or heat exchanger is arranged at the bottom of the cooling water tank to directly heat the liquid. These heating means,
Cannot stir liquid. Therefore, the cooling water tank must be provided with a liquid stirring means.

The heating means 5 is controlled by the temperature sensor 6 to heat the liquid to a set temperature. The temperature sensor 6 includes a sensor member 6A that detects the temperature of the liquid in the cooling water tank 2 and a control circuit 6B that opens and closes the control valve 13 of the steam boiler 8 with the output of the sensor member 6A. Sensor member 6A
Instead of the liquid temperature of the cooling water tank 2, the circulating liquid temperature can be detected.

The control circuit 6B stores the set temperature, and when the liquid temperature is lower than the set temperature, the control valve 13 is opened to inject the heated steam from the steam injection pipe 7. When the liquid temperature becomes higher than the set temperature, the control circuit 6B closes the control valve 13 and stops the steam injection from the steam injection pipe 7. The control circuit 6B includes a storage temperature changing unit that stores the temperature, and changes the temperature setting to adjust the liquid temperature to an optimum value. When the outside air temperature is low, the set temperature of the liquid is raised to prevent freezing of the concrete. When the outside air temperature is high, the set temperature is lowered to save the energy consumption of the heating means 5.

When an electric heater is used as the heating means 5,
The temperature sensor controls the energization of the electric heater to control the liquid temperature to the set temperature. A temperature sensor that controls the electric heater controls a switch (not shown) instead of the control valve 13. The temperature sensor energizes the electric heater to heat the liquid when the liquid temperature is lower than the set temperature. When the liquid temperature becomes higher than the set temperature, the energization of the electric heater is stopped and the liquid temperature is controlled to the set temperature.

In a device using a heat exchanger for passing steam through the heating means, the temperature of the liquid can be controlled by controlling the control valve with a temperature sensor. The control valve is connected to the heat exchanger and the steam circuit of the steam boiler. When the control valve is opened, heating steam is circulated through the steam boiler and the heat exchanger to heat the heat exchanger, and the heat exchanger heats the liquid. When the control valve is closed, steam is not circulated from the steam boiler to the heat exchanger, the heat exchanger is not heated by the steam, and the liquid is not heated by the steam. Therefore, the temperature sensor 6 can open and close the control valve to adjust the liquid to the set temperature.

The submerged transfer means 4 is a conveyer for carrying the aggregate thereon. The immersion transfer means 4 transfers the aggregate while immersing it in a liquid to continuously heat it. The conveyor is
It is provided with a porous conveyor belt 4A on which the aggregate is placed, immersed in a liquid and transferred. Porous conveyor belt 4A shown
Transfers the aggregate from the right side to the left side of the cooling water tank 2.

The porous conveyor belt 4A is used for the cooling water tank 2
It is driven by being hung on rollers arranged at both ends of the. The roller is driven by a motor (not shown) to transfer the porous conveyor belt 4A. The aggregate heated by being immersed in a liquid by the immersion transfer means 4 is preferably
It is drained and supplied to the mixer 1. The aggregate is drained on the discharge side of the immersion transfer means 4 or drained by connecting a separate draining device between the immersion transfer means 4 and the mixer 1. Draining of the aggregate on the discharge side of the immersion transfer means 4 can be realized by vibrating the belt of the immersion transfer means 4.

[0041]

Industrial Applicability The green concrete producing apparatus of the present invention is
A member for immersing the aggregate in a liquid and cooling the aggregate is used together with heating to heat the aggregate. The apparatus for cooling the aggregate includes a cooling water tank for storing the liquid, and an immersion transfer means for immersing and transferring the aggregate in the liquid. Since the ready-mixed concrete manufacturing apparatus of the present invention uses these members together to heat the aggregate, the only member required to heat the aggregate is the liquid heating means. As a heating means for heating the liquid, a steam boiler, a heater, or the like can be used, and therefore an extremely simple and inexpensive one may be used. This is because the ready-mixed concrete manufacturing apparatus of the present invention adjusts the temperature by immersing the aggregate in a liquid. Therefore, the apparatus for producing ready-mixed concrete of the present invention has a feature that the increase in equipment cost can be minimized and the kneading temperature of ready-mixed concrete can be adjusted to an optimum value by cooling or heating the aggregate to an accurate temperature.

Further, in the ready-mixed concrete manufacturing apparatus of the present invention, when the steam boiler is used as the heating means and the heated steam is injected into the liquid, the heated steam injected into the liquid stirs the liquid and the bottom is agitated. The fine particle components deposited on the are suspended in the liquid. For this reason, the fine particle components attached to the aggregate and carried in can be attached again to the surface of the aggregate and discharged without depositing on the bottom of the cooling water tank. Therefore, the aggregate can be heated to a predetermined temperature and can be discharged without removing the fine particle component, and it is possible to prevent the strength of the concrete from decreasing due to the small amount of the fine particle component.

As described above, the apparatus for producing ready-mixed concrete of the present invention, which can cool or heat the aggregate, can adjust the ready-mixed concrete to the optimum temperature of the outside air. Therefore, the aggregate is cooled to prevent the harmful effects of the heat of the concrete during hot weather,
The aggregate can be heated to prevent the adverse effects of freezing. The outside air temperature changes greatly every day during the heat and winter, and also changes considerably depending on the time of placing. The ready-mixed concrete manufacturing apparatus of the present invention has a feature that the temperature of the aggregate can be adjusted to bring the ready-mixed concrete to an optimum kneading temperature. This type of device is often used at a large-scale ready-mixed concrete pouring site, and temperature changes during transfer cannot be ignored. When the outside air temperature becomes low, the raw concrete temperature decreases during the transfer, and when the outside air temperature becomes high, the temperature rises during the transfer. The ready-mixed concrete manufacturing apparatus of the present invention can adjust the kneading temperature in consideration of the temperature of the transfer environment. Therefore, it has the feature that it can be used at a site where external conditions such as temperature change drastically, and that ready-mixed concrete at an optimum temperature can always be produced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a ready-mixed concrete manufacturing apparatus showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mixer 2 ... Cooling water tank 3 ... Stirring means 4 ... Immersion transfer means 4A ... Porous conveyor belt 5 ... Heating means 6 ... Temperature sensor 6A ... Sensor member 6
B ... Control circuit 7 ... Steam injection pipe 8 ... Steam boiler 9 ... Circulation pump 10 ... Circulation pipe 11 ... Sprinkler pipe 12 ... Flow control valve 13 ... Control valve 14 ... Cooling means 15 ... Cooling heat exchanger 15A ... Cold water pipe 1
5B ... Casing 16 ... Forced cooler 17 ... Compressor 18 ... Condenser 19 ... Expansion valve

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Takeshi Kanari 2-10-5 Katamachi, Miyakojima-ku, Osaka-shi, Osaka Prefecture Kumagai Gumi Osaka Branch (72) Inventor Yasuhide Maeda 2-peace, Minami-ku, Fukuoka-shi, Fukuoka No. 5 No. 28 Heiwa House No. 501 (72) Inventor Ryotaro Ushio No. 1 in real name in white, Ikeda-cho, Miyoshi-gun, Tokushima Prefecture (72) Masayuki Takeuchi 5-11-522, Sako 4th-cho, Tokushima City, Tokushima Prefecture

Claims (3)

[Claims] 1. A mixer (1) for adding aggregate to cement and kneading, a cooling water tank (2) for storing a liquid for immersing the aggregate to be supplied to the mixer (1), and a cooling water tank (2). Immersion transfer means (4) for immersing the aggregate in liquid and carrying it out, cooling means (14) for cooling the liquid in the cooling water tank (2), and cooling means for detecting the liquid temperature in the cooling water tank (2) ( 14) is provided with a temperature sensor (6) for controlling, the aggregate is immersed in the cooling water tank (2) by the immersion transfer means (4), the aggregate is cooled by the liquid in the cooling water tank (2), and the mixer ( In the ready-mixed concrete manufacturing apparatus configured to supply to (1), the heating means (5) is connected to the cooling water tank (2),
The cooling water tank (2) heats the aggregate in the cooling water tank (2) by heating the liquid in the cooling water tank (2) and immersing the aggregate in the heated liquid and discharging it. An apparatus for producing ready-mixed concrete, which is used together with. 2. A mixer (1) for kneading aggregate by adding it to cement, a cooling water tank (2) for storing a liquid for immersing the aggregate supplied to the mixer (1), and a cooling water tank (2). Immersion transfer means (4) for immersing the aggregate in liquid and carrying it out, cooling means (14) for cooling the liquid in the cooling water tank (2), and cooling means for detecting the liquid temperature in the cooling water tank (2) ( 14) is provided with a temperature sensor (6) for controlling, the aggregate is immersed in the cooling water tank (2) by the immersion transfer means (4), the aggregate is cooled by the liquid in the cooling water tank (2), and the mixer ( In the apparatus for producing ready-mixed concrete configured to supply to (1), a heating means (5) is connected to a cooling water tank (2) and a stirring means (3) is provided, and a heating means (5) Heats the liquid in the cooling water tank (2), the stirring means (3) stirs the liquid in the cooling means (14), and the aggregate is immersed in the heated and stirred liquid and then discharged. Warm the aggregate in the cooling water tank (2) That cooling water tank
An apparatus for producing ready-mixed concrete, which is used in combination with (2). 3. A mixer (1) for kneading aggregate by adding it to cement, a cooling water tank (2) for storing a liquid for immersing the aggregate supplied to this mixer (1), and a cooling water tank (2). Immersion transfer means (4) for immersing aggregate in liquid and carrying it out, cooling means (14) for circulating and cooling the liquid in the cooling water tank (2), and detecting the liquid temperature in the cooling water tank (2) Temperature sensor controlling the cooling means (14)
(6), the cooling means (14), the cooling heat exchanger (15) for circulating the liquid in the cooling water tank (2), and the cooling heat exchanger (1
The cooling heat exchanger (15) cools the liquid in the cooling water tank (2), and the immersion liquid transfer means (4) is included in the cooled liquid. Is an apparatus for producing ready-mixed concrete in which aggregate is immersed and cooled aggregate is supplied to the mixer (1), the cooling water tank (2) is connected to a heating means (5). Cage,
The heating means (5) is a steam injection pipe installed at the bottom of the cooling water tank (2).
(7) and a steam boiler that supplies heated steam to this steam injection pipe (7), the steam injection pipe (7) heats the liquid in the cooling water tank (2), and An apparatus for producing ready-mixed concrete, characterized in that the material is soaked and supplied to a mixer (1).