JPH03108510A - Cooling device for concrete - Google Patents

Abstract

PURPOSE:To prevent deterioration of working environment and to uniformly cool ready-made concrete by installing a pair of auxiliary auger equipments in which ready-made concrete and cooled ready-made concrete are filled when ready-made concrete and a liquefied low-temp. medium are agitated in an auger equipment. CONSTITUTION:Similarly to a main auger equipment 10, a pair of auxiliary auger equipments 12, 14 are equipped respectively with the cylindrical bodies 12a, 14a, the rotary shafts 12b, 14b, the impellers 12c, 14c, the transfer augers 12d, 14d, the feed ports 12e, 14e, the discharge ports 12f, 14f and the driving motors M2, M3. The discharge port 12f of one side of auxiliary auger equipment 12 is communicated with the feed port 10e of the main auger equipment 10. The feed port 14e of the other side of auxiliary auger equipment 14 is communicated with the discharge port 10f of the main auger equipment 10. Three sets of auger equipments are installed in such a state that these are connected in series. Thereby working environment is not deteriorated and ready-made concrete can be uniformly cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a concrete cooling system, and in particular to an LN cooling system.
This invention relates to an improvement of a device for cooling concrete with a liquefied low-temperature medium such as No. 2.

(Prior Art) As is well known, in hot summer concrete and mass concrete, the amount of heat generated by the hydration reaction of cement is large, so cracks are likely to occur when the poured concrete hardens.

Therefore, recently, a technique has been provided in which fresh concrete is cooled with a liquefied low-temperature medium such as LN2 to reduce the occurrence of cracks.

For example, Japanese Patent Application Laid-Open No. 19912/1983 describes a device that employs such a cooling method, which transfers concrete constituent materials individually supplied from one end to the other end, and Disclosed is a concrete feeding device equipped with an auger mixer that mixes and continuously feeds fresh concrete, the continuous concrete feeding device having a plurality of inlets for liquefied low-temperature medium along the transfer direction of the auger mixer. ing.

However, the feeding device shown in this publication has
There were technical issues explained below.

(Problem to be Solved by the Invention) In other words, in the supply device described in the above publication, since the supply port for concrete constituent materials of the auger mixer and the discharge port for cooled fresh concrete are in an open state, vaporized liquefied concrete Low-temperature media was released from the supply and discharge ports, worsening the working environment.

Furthermore, since the supply port and the discharge port are open, it is difficult to control the temperature of the ready-mixed concrete, making it difficult to uniformly cool the ready-mixed concrete.

This invention was made in view of these problems, and its purpose is to provide a concrete cooling device that can uniformly cool fresh concrete without deteriorating the working environment. .

(Means for Solving the Problems) In order to achieve the above object, the present invention has a supply port for fresh concrete formed at one end side, a discharge port for cooled ready concrete formed at the other end side, and a discharge port for fresh concrete after cooling. In the concrete cooling device, the concrete cooling device is provided with an auger device installed between the supply port and the discharge port, and moves the fresh concrete from the supply port to the discharge port while stirring the fresh concrete together with a liquefied low-temperature medium. , a pair of auxiliary auger devices are installed which are respectively filled with the fresh concrete and the cooled fresh concrete while the auger device is stirring the fresh concrete and the liquefied low-temperature medium.

(Operation and Effect of the Invention) According to the concrete cooling device configured as described above, the supply port and the discharge port of the auger device that stirs the fresh concrete and the liquefied low-temperature medium are connected to the auxiliary auger device filled with the fresh concrete and the cooled concrete after cooling. Each one is closed with an auxiliary auger device filled with fresh concrete, which reduces the release of vaporized liquefied low-temperature medium to the outside, prevents deterioration of the working environment, and evenly cools the fresh concrete. .

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a concrete cooling device according to the present invention.

The cooling device shown in the figure is generally composed of a main auger device 10 and a pair of auxiliary auger devices 12,14.

The main auger device 10 includes a hollow cylindrical body 10a, a rotation shaft 10b installed on the central axis of the cylinder 10a, a plurality of stirring blades 10c and a transfer auger IC 1d alternately fixed to the rotation shaft 10b. and a drive motor M1 attached to a portion of the rotating shaft 10b that protrudes outward from the cylinder body 10a. There is a 10f outlet at the bottom.
has been established.

A plurality of injection ports 16 for liquefied low temperature medium (LN2) are provided along the longitudinal direction on the side surface of the cylinder 10a, and each injection port 16 has control valves Vl, V2,
... are connected, and the other ends of the control valves Vl, V2, ... are merged and connected to an LN2 supply source (not shown).

Further, a discharge port 18 for vaporized LN2 is provided on the rear side of the cylinder 10a, and white smoke containing water vapor is generated in the middle of this discharge port 18 when LN2 is vaporized. A treatment device 20 for treating white smoke is provided.

On the other hand, the pair of auxiliary auger devices 12 and 14, like the seed auger device 10, each have cylinders 12a and 14a, rotating shafts 12b and 14b, stirring blades 12C and 14e, and % transfer augers 12d and 14dS@feeding rotors 12e and 14e. , discharge ports 12f, 14f, drive motor M2. It has M3,
The discharge port 12f of one auxiliary auger device 12 is communicated with the supply port 10e of the main auger device 10, and the supply port 14e of the other auxiliary auger device 14 is communicated with the discharge port 10f of the main auger device 10. The auger devices are connected in series.

In this embodiment, when the three auger devices 10, 12.14 are installed, the pair of auxiliary auger devices 12.14 are arranged so that the central axes of the respective cylinders 12a, 14a are approximately horizontal. Installed, main auger device 1
0 is installed such that the central axis of the cylindrical body 10H is inclined upward toward the rear side.

By arranging in this manner, the discharge port 18
The vaporized LN2 is smoothly released from the tank.

Additionally, the pair of auxiliary auger devices 12, 14 have substantially smaller lengths and diameters of the cylinders 12a, 14, respectively, than the main auger device 10.

Furthermore, the supply port 12e of the auxiliary auger device 12 on the front stage side
A supply hole 22 for fresh concrete C is attached to the housing, and a discharge tube 24 for fresh concrete C' after cooling is attached to the outlet 14f of the auxiliary auger device 14 on the rear side. ing.

In the concrete cooling device equipped with the groove bottom described above, the ready-mixed concrete C supplied from the hopper 22 is transferred to the auxiliary auger device 12. Main auger device 10. Auxiliary auger device 1
4 and in the process of being transferred, the inlet 1 of the main auger device 10
The exhaust pipe 24 is cooled by LN2 injected from the
The cooled fresh concrete C' is sent out from the hopper 22, and in this embodiment, the first temperature sensor T1, which is installed in the hopper 22 and detects the temperature of the fresh concrete C, and the discharge tube are connected. Control valves Vl, V2,
... and drive motors M1, M2 and M3 are controlled by a control device shown in FIG.

The control device shown in the figure includes a comparator 26 that detects the difference between the measured values of temperature sensors TI and T2, and LN2 from control valves Vl, V2°, etc. based on the output signal of this comparator.
a flow rate control unit 28 that adjusts the supply amount of the
Based on the output signals of drive motors Ml, M2 . It is composed of a rotation speed control unit 30 that controls the rotation speed of M3, that is, the transfer amount of fresh concrete C or cooled fresh concrete C''.

In the flow control unit 28, for example, control valves Vl,
Priorities are set for V2... such that the supply amount of LN2 is increased sequentially from the one closest to the supply port 10e, and the LN2 is increased according to the size of the temperature difference detected by the comparator 26.
Adjust the supply amount.

In addition, if the temperature of the cooled concrete C' does not reach the set value even after opening all of the control valves Vl, V2, etc., the speed control unit 30 controls the drive motor M.
Controls the rotation of 1.

Furthermore, in the speed control unit 30, the L
When N2 is injected and the fresh concrete C is being cooled, the drive motors M2. The rotation speed of M3 is adjusted.

Now, according to the concrete cooling device having the above configuration, the main auger device 10 for stirring the fresh concrete C and LN2
The supply port 10e and the discharge port 10f of the fresh concrete C
The auxiliary auger device 12 filled with fresh concrete C′ and the auxiliary auger device 14 filled with cooled fresh concrete C′ are respectively closed. This makes it possible to prevent deterioration of the working environment, and also makes temperature control easier, allowing the ready-mixed concrete to be cooled uniformly.

In the above embodiments, LN2 is used as an example of the liquefied low-temperature medium, but other mediums may be used.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a concrete cooling device according to the present invention, and FIG. 2 is a block diagram showing a control device of the same device. 10 Main auger device 12.1
4...Auxiliary auger device

Claims (1)

[Claims] A supply port for fresh concrete is formed at one end, and a discharge port for cooled concrete is formed at the other end. In a concrete cooling device equipped with an auger device that moves the concrete from the supply port to the discharge port while stirring, when the fresh concrete and the liquefied low-temperature medium are being stirred by the auger device at the supply port and the discharge port, , A concrete cooling device characterized in that a pair of auxiliary auger devices are installed, each of which is filled with the fresh concrete and the cooled fresh concrete.