JPH054965Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to an apparatus for producing hot concrete.

<Conventional technology> It has been known that mixing concrete at a high temperature accelerates the hardening of the concrete.This has been achieved by stirring and kneading concrete with high-temperature water, or by injecting steam into the concrete while stirring. That is what is being considered.

When stirring and kneading concrete with high temperature water,
At first, the concrete becomes hot, but as time passes, the temperature drops, making it impossible to obtain the full effect.

In addition, as a hot concrete manufacturing equipment,
For example, there is a device as described in Japanese Utility Model Publication No. 58-52902.

This type of equipment has a drum-shaped stirring tank with a number of stirring arms with blades attached to the shaft of the stirrer, and steam is injected from the steam holes opened in the stirring tank to mix 40 to 60 pieces of concrete. It can be heated to ℃ and stirred.

If the temperature is too high at this time, the unit amount of water during stirring and kneading of concrete will be too large and the strength of the molded product will be weakened. Therefore, it is necessary to control the temperature of the concrete in the stirring tank. Therefore, as means for detecting the temperature of concrete, attempts have been made to install a contact thermometer in a part of the stirring tank that comes into contact with the concrete, to directly detect the temperature of the concrete, and to adjust the heating by steam.

<Problems to be Solved by the Invention> However, as described above, when a contact thermometer is used, concrete may adhere to the sensor portion that comes into contact with the concrete, resulting in an error in the detected temperature. Additionally, when steam is ejected, depending on the condition of the stirring arm and concrete, the contact thermometer may detect infrared rays emitted from the steam, which may erroneously detect the temperature of the steam ejected into the stirring tank instead of the temperature of the concrete. Something happened. Furthermore, since the sensor portion of a contact thermometer is constantly in contact with the concrete being stirred and kneaded, it has been required to have a certain level of strength.

Therefore, although it is possible to measure the temperature of concrete with a contact thermometer experimentally, it is not suitable for on-site use. The amount of steam ejected was often adjusted.

However, this method cannot accurately detect the temperature of concrete during mixing, making it difficult to produce hot concrete at a predetermined temperature.

This invention solves the above-mentioned problems and aims to provide an apparatus that can detect the temperature of concrete without error and can produce hot concrete at a predetermined temperature.

<Means for Solving the Problems> The hot concrete manufacturing apparatus according to this invention has a stirring arm that rotates inside, a stirring tank for stirring and kneading concrete, and a heating means for heating the concrete. In the equipment for manufacturing hot concrete, a non-contact thermometer that detects the temperature of concrete without contacting the concrete is installed in the upper outer part of the stirring tank in communication with the stirring tank. The above-mentioned problems are solved by providing an air ejection mechanism that ejects air downward from the location where the meter is installed.

<Example> This invention will be explained below based on the illustrated example.

The stirring tank 2 of the manufacturing apparatus 1 of this embodiment has a substantially drum shape, and a rotating shaft 4 is rotatably supported at the center in the axial direction. A stirring arm 5 having a flat plate-like blade 6 attached to its tip is disposed on the rotating shaft 4.

In addition, a plurality of steam holes 7 are bored at the lower outer periphery of the stirring tank 2 as heating means.
A pipe member 9 from a steam supply source 8 is connected to.

A substantially truncated conical cover portion 1 is provided on the top of the stirring tank 2.
A non-contact thermometer 14 is disposed via 2. As the non-contact type thermometer 14, for example, one manufactured by Canon Inc. or Optex Inc. that has a sensor section and an amplifier section separated can be used.

This non-contact thermometer 14 uses a sensor section to measure infrared rays emitted from the concrete C to detect the temperature of the concrete C.
2 is located above. Non-contact thermometer 14
is a concrete C like a conventional contact thermometer.
Since there is no contact with the concrete C, there is no possibility that the concrete C will adhere to the sensor part and cause an error in the temperature measurement of the concrete C being stirred and kneaded. Furthermore, the non-contact thermometer 14, especially the sensor portion, is no longer required to have as much strength as before.

Further, below the non-contact thermometer 14, an air hole 16 of an air blowing mechanism 15 is formed so as to be inclined downward. An air pipe member 17 from an air supply source is connected to this air hole 16, and when air is jetted inward from the air hole 16 into the cover part 12, the air descends downward while swirling. I have to go.

Hot concrete manufacturing apparatus 1 of this embodiment
When the temperature of the concrete C placed in the stirring tank 2 is low, especially in winter, when the temperature of the concrete C placed in the stirring tank 2 is low, steam is ejected from the steam hole 7 while stirring and kneading the concrete C by rotating the stirring arm 5. C
The temperature of concrete is raised to create hot concrete at a temperature of approximately 40 to 60 degrees Celsius.

At this time, if the temperature of concrete C becomes too high, the unit amount of water during mixing becomes too large and the strength of the molded product becomes weak. Based on the temperature, the amount of steam ejected from the steam hole 7 is adjusted via a control mechanism 10 that controls the steam supply source 8.

In the manufacturing apparatus 1 of this embodiment, an air hole 16 is provided below the non-contact thermometer 14, and air is blown out from the air hole 16, so that the air exists between the non-contact thermometer 14 and the concrete C. Since the water vapor and the like are blown away, there is no possibility of erroneously measuring infrared rays emitted from the water vapor, dust, etc. existing between the non-contact thermometer 14 and the concrete C.

Therefore, the temperature of the concrete C can be detected accurately without error, and hot concrete at a predetermined temperature can be manufactured.

Concrete C that has been sufficiently stirred and kneaded
The liquid is released from the lid 3 provided at the bottom of the stirring tank 2 to the outside.

In addition, if a bandpass filter that allows only a predetermined wavelength (for example, 8 to 14 μm) to pass is provided in the sensor part of the non-contact thermometer 14, concrete C.
The possibility of detecting infrared rays emitted from other sources is reduced, and the temperature of concrete C can be measured more accurately.

<Effects of the invention> As explained above, in the hot concrete production equipment of this invention, a non-contact thermometer that detects the temperature of concrete without coming into contact with the concrete is installed in the upper outer part of the stirring tank. An air ejection mechanism is disposed in communication with the thermometer and ejects air downward from a location where the non-contact thermometer is provided.

By using a non-contact type thermometer, the temperature of concrete can be accurately detected without causing an error in the detected temperature of concrete that is being stirred and kneaded due to adhesion of concrete, which is the case with conventional contact type thermometers. be able to.

In addition, the air blowing mechanism blows air downward from the location where the non-contact thermometer is installed, blowing away water vapor and dust between the non-contact thermometer and the concrete. It is possible to prevent the temperature of objects other than concrete from being detected incorrectly, and to accurately detect the temperature of concrete.

Therefore, hot concrete at a required predetermined temperature can be produced.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing an embodiment of the hot concrete manufacturing apparatus of this invention, and FIG. 2 is a partial cross-sectional view of the vicinity of a location where a non-contact thermometer is installed. 1... Hot concrete production equipment, 2... Stirring tank, 5... Stirring arm, 7... Steam vent, 8...
Steam supply source, 14... Non-contact thermometer, 15...
Air blowout mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] A hot concrete manufacturing apparatus comprising a stirring tank having an internally rotating stirring arm for stirring and kneading concrete, and a heating means for heating the concrete, wherein the hot concrete is brought into contact with the concrete. A non-contact type thermometer that detects the temperature of the concrete without touching the concrete is disposed at an upper outer part of the stirring tank so as to communicate with the stirring tank, and a non-contact type thermometer that detects the temperature of the concrete without touching the concrete is disposed in communication with the stirring tank, and a non-contact type thermometer that detects the temperature of the concrete without touching the concrete is disposed at an outer part of the upper part of the stirring tank, and is arranged in a downward direction from the part where the non-contact type thermometer is installed. A hot concrete manufacturing device characterized by being equipped with an air blowing mechanism that blows out air.