JP2802010B2 - Temperature meter for cooling concrete management - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for cooling concrete management using an infrared sensor.

[0002]

2. Description of the Related Art As an example of a method for efficiently producing cooled concrete, an agitator or a mixer (including a concrete mixer truck) of a concrete production plant is generally used.
There is a method of blowing liquefied nitrogen, for example, as a liquefied gas into a mixer, and cooling the concrete using the latent heat of vaporization.

[0003] The finish of this type of cooled concrete is determined by measuring the concrete temperature before and after cooling. As a concrete measuring method, conventionally, a liquid column type temperature such as mercury or alcohol is used. After the concrete was sampled, the temperature of the sample was measured using these thermometers.

[0004]

However, in this measuring method, sampling is troublesome, for example, by temporarily stopping the driving of the mixer. In addition, in order to accurately measure the temperature of the obtained sample, the liquid column needs to be longer. It has to be left to a stationary equilibrium state, it takes several minutes to obtain a measured value, and there is a possibility that the sample temperature may change during the measurement, and the temperature control tends to be inaccurate.

[0005] On the other hand, a temperature measurement method using an infrared sensor known as a known technique is a non-contact method, does not require sampling, and has a short measurement time. However, the inside of the mixer captures infrared rays directly generated from the concrete surface because the water is frozen by the cooling effect of the injection of liquefied nitrogen, and a dense mist of white smoke mixed with concrete mist is generated. And could not be measured in practice.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to directly measure the surface temperature of concrete by a non-contact method by removing white smoke on a detection surface of an infrared sensor. It is intended to provide a measuring instrument.

[0007]

In order to achieve the above object, the present invention provides a sheath tube having one end opening facing the cooling concrete, and a sheath tube provided at the other end of the sheath tube, with a measuring surface facing the opening. An infrared temperature sensor, an air supply tube having one end communicating with the sensor fixed side end of the sheath tube, and the other end communicating with the outside air side, and an air supply fan for supplying outside air into the sheath tube through the air supply tube , Connect to the open end of the sheath
And an exhaust pipe protruding from the side of the sheath .

[0008] The term "facing one end opening of the sheath tube to the cooling concrete" means that the opening is brought close to the surface of the cooling concrete and opposed in a non-contact state.
Ru der which the tip of the sheath tube was embedded into the cooling concrete also includes embodiments for opposing the one end opening.

[0009]

According to the above arrangement, if the opening surface of the sheath is opposed to the concrete surface to be measured and the air supply fan is driven, the outside air flows through the sheath toward the opening to measure the infrared sensor. The surface is transparent up to the concrete surface,
The surface temperature of concrete can be measured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a usage form of a temperature measuring device for cooling concrete management according to the present invention.
The concrete 2 cooled by liquefied nitrogen is accommodated in the casing 1a of the first embodiment, and the cooled concrete 2 is measured by the temperature measuring device 3 according to the present invention inserted into the casing 1a.

The temperature measuring device 3 is inserted into the casing 1a, and one end opening 4 is formed on the surface of the cooling concrete 2.
a and the infrared sensor 5 disposed on the other end of the sheath 4 outside the casing 1a.
An air supply pipe 6 connected to the sheath mounting end side of the sheath pipe 4 by a pipe, an air supply fan 7 provided in the air supply pipe 6, and
The exhaust pipe 8 is connected to a side surface of the sheath pipe 4 on the opening 4a side.

The infrared sensor 5 is inserted into the upper end of the sheath tube 4 and has a detection surface directed to the other end opening of the sheath tube 4 and receives infrared energy radiated from the surface of the cooling concrete 2. A light receiving section 5a including a light receiving element and the like is provided at the tip of the case 5b.

Although not shown in the case 5b, a photoelectric conversion unit for converting infrared energy received by the light receiving unit 5a into electric energy, an amplifying unit, and a direct reading unit provided on a surface opposite to the light receiving unit. , A measurement start trigger, an external output terminal, and the like.

The air supply pipe 6 communicates with the outside air. When the air supply fan 7 is driven to rotate, the outside air flows through the air supply pipe 6 through the sheath pipe 4 and is discharged into the casing 1a through the exhaust pipe 8 and the opening 4a. Is done. The exhaust pipe 8
It is useful when one end opening 4a by implantation the tip of the sheath tube 4 into the cooling concrete 2 is penetrated into the surface of the cooling concrete 2, cooling the end opening 4a concrete
When it is as close as possible to the surface of
Ru der one provided as an auxiliary exhaust means for miss al introduced outside air to the outside.

In the above configuration, the cooling concrete 2
In a state in which liquefied nitrogen is blown into and stirred and mixed, the interior space of the casing 1a is filled with white smoke due to the cooling effect of the liquefied nitrogen, and measurement cannot be performed by a normal non-contact infrared sensor.

However, prior to the measurement, the air supply fan 7
When the driven rotating, introduces the outside air into the sheath tube 4 as indicated by the solid line in the figure, white smoke staying inside the sheath tube 4 is out feed through the opening 4a and the exhaust pipe 8 and transparency,
The light receiving portion 5b of the infrared sensor 5 can capture the infrared wavelength from the surface of the cooling concrete 2 as shown by a chain line in the figure. Therefore, when the infrared sensor 5 is set to the measurement state in this state, the surface temperature of the cooling concrete 2 can be measured immediately.

The above temperature measuring device 3 is portable.
If necessary, the sheath 4 can be inserted into the mixer 1 to measure the temperature manually, or the temperature can be measured as a fixed type and incorporated in the mixer 1 as a measuring device in advance.

Further, a lower limit of the temperature detected by the infrared sensor 5 is set in advance, an alarm is generated when the measured value reaches the set temperature, or a mixer driving device or a liquefied nitrogen supply device is supplied through an external output terminal. Various types of automation are also possible, such as automatically stopping them in conjunction with the valve mechanism.

[0020]

As explained in detail in the above embodiments, in the cooling concrete management temperature measuring device according to the present invention, the opening of the sheath tube faces the concrete surface to be measured, and the air supply is performed. When the fan is driven, the outside air flows through the sheath toward the opening, and the measurement surface of the infrared sensor is made transparent to the concrete surface, making it possible to measure the surface temperature of concrete, eliminating the need for conventional sampling work. In addition, since there is no need to stop the apparatus, the production of the cooling concrete can be performed smoothly, and the concrete temperature can be quickly measured, and the temperature of the cooling concrete can be accurately controlled.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a use state of a temperature measuring device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mixer 1a Casing 2 Cooling concrete 3 Temperature measuring device 4 Sheath pipe 4a Opening 5 Infrared sensor 6 Air supply pipe 7 Air supply fan 8 Exhaust pipe

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takeshi Wakamatsu 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office 2-10005 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B28C 5/00-5/48

Claims (1)

(57) [Claims] 1. A sheath tube having one end opening facing the cooling concrete, an infrared temperature sensor provided on the other end side of the sheath tube and having a measurement surface facing the opening, and one end portion being a sensor fixing side of the sheath tube. An air supply pipe communicating with one end and the other end communicating with the outside air side, an air supply fan for supplying outside air into the sheath through the air supply pipe, and communicating with an opening end of the sheath tube;
A temperature measuring device for cooling concrete management, comprising: an exhaust pipe protruding from a side of the sheath .