JPH04197707A - Aggregate cooling apparatus - Google Patents

Abstract

PURPOSE:To carry heat of vaporization away and to cool the aggregate uniform ly by bringing water content adhered on the surface of an aggregate into effi cient contact with an air with a low humidity while the aggregate is cut out in a cooling room and is successively carried in the cooling room. CONSTITUTION:An aggregate 6 cut out in a cooling room 5 is successively carried under a stirred condition from one end side to another end side in the longitudinal direction of the cooling room 5 by means of a rake-shaped scraper unit 12 having a lot of scraper plates 11. While the aggregate 6 is carried in the cooling room 5 by means of an aggregate carrying apparatus 10, an air feeding apparatus 20 feeds the air with a low humidity into the cooling room 5 from an air inlet 15 through an air duct 16 to bring the air with a low humidity into efficient contact with the water content adhered on the surface of the aggregate 6. Vaporization of the water content adhered with the surface of the aggregate 6 is accelerated thereby and the aggregate 6 is uniformly cooled by carrying heat of vaporization away. The cooled aggregate 6 is carried to another end side in the longitudinal direction of the cooling room 5 by means of the aggregate carrying apparatus 10 and is fed to a batcher plant.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an aggregate cooling device.

[Prior Art] As shown in Figure 5, Hasocha Plant 1 uses cement, water, sand, gravel, which are the materials that make up concrete, as well as admixtures that improve the fluidity and other properties of concrete. It is a blunt for producing concrete by weighing and mixing in a predetermined proportion and putting it into a mixer and mixing it.Generally, aggregates such as sand and gravel are supplied to the batch plan 1-1. This is carried out from a stockyard 2 where the aggregate is stored via a transport device 3 such as a container.

Concrete manufactured at the Hasocha Plant is either transported to the pouring site and poured, or, especially in large-scale concrete structures, large temperature changes may occur in the concrete after pouring due to the heat of hydration of the cement. However, in some cases, cracks may occur due to this, which may affect the functionality and durability of the structure.

As a means to solve such problems, there is a pre-cooling method in which concrete materials such as aggregate 6, cement, and water supplied to the batch plant 1 are cooled in advance to suppress the temperature at which the concrete is mixed.

Conventionally, the main means of cooling aggregates used for pre-cooling of concrete are: ■ Cooling with cold air (cold air cooling), ■ Cooling by sprinkling or soaking in cold water (chilled water cooling), ■ Using cryogenic liquid nitrogen. Cooling (liquid nitrogen cooling), ■ Cooling that exhausts the air inside a container filled with aggregate to near vacuum, lowers the boiling point of water to near room temperature, and uses the heat of vaporization at that time (vacuum cooling), etc. be.

“Invention or Problem to be Solved” Listing the main problems with each cooling means:
It is as follows.

■Cold air cooling ・It is difficult to cool the aggregate uniformly.

・Poor cooling efficiency.

・A large-scale cooling plant is required.

■Cold water cooling ・A large-scale cooling plant is required.

- Many incidental facilities (water supply equipment, drainage equipment, turbid water treatment equipment, dewatering equipment, etc.).

■Liquid nitrogen cooling ・Running costs are high.・ - Difficult to handle due to high pressure and extremely low temperature.

・There is a lot of cooling loss.

■Vacuum cooling ・It is difficult to cool the aggregate uniformly.

・Equipment costs are expensive.

・Surface water management is difficult.

In view of these circumstances, the present invention aims to provide an aggregate cooling device that has high cooling efficiency and is excellent in safety, economy, etc.

[Means for Solving the Three Problems] The present invention provides: a hopper that receives supplied aggregate; a cutting device that cuts out the aggregate received in the hopper into a cooling chamber; and a bone cut out by the cutting device. an aggregate conveyance device capable of conveying aggregates into the cooling chamber; a ventilation duct having an air outlet for blowing low-humidity air onto the aggregate conveyed in the cooling chamber by the aggregate transportation device; and from the ventilation duct. an exhaust port for exhausting the air sent into the cooling chamber and removing moisture from the surface of the aggregates to the outside of the cooling chamber; and an exhaust port for transporting the aggregates conveyed inside the cooling chamber by the aggregate conveying device to the outside of the cooling chamber. It is characterized by being equipped with an exit port.

[For production] Therefore, the aggregate put into the hopper is cut out.

The aggregate is cut into the cooling chamber through the aggregate conveying device, and is transported one by one into the cooling chamber by the aggregate conveying device. During this time, the low-humidity air is sent through the ventilation duct into the cooling chamber from the ventilation opening, and the aggregate surface As a result, the vaporization of the water adhering to the surface of the aggregate is promoted, and the heat of vaporization is taken away and the aggregate is uniformly cooled. The aggregate is then transported out of the cooling chamber from the exit.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention. As shown in FIG. establish.

Hereinafter, the configuration of the aggregate cooling device 4 will be explained in detail.

In the figure, reference numeral 5 denotes a cooling chamber constituting the aggregate cooling device 4, and a hopper 7 is provided at the upper side of one longitudinal end of the cooling chamber 5 to receive the aggregate 6 supplied from the stockyard 2 by the conveying device 3. , a dispersion screw 8 is provided so as to open into the inside of the cooling chamber 5, and is rotatably disposed inside the hopper 7 for uniformly distributing the input aggregate 6 in the width direction of the cooling chamber 5; A feeder 9 as a cutting device for cutting out a fixed amount of the aggregate 6 into the cooling chamber 5 is attached to the bottom opening of the hopper 7.

In the cooling chamber 5, there is provided an aggregate conveying device IO capable of conveying the aggregate 6 cut out in a fixed amount by the feeder 9 from one end of the cooling chamber 5 in the longitudinal direction to the other end.

The aggregate conveying device IO moves a square-shaped scraper unit 12 consisting of a large number of scraper plates 11 arranged at a required pitch in the width direction of the cooling chamber 5 to a sprocket 13.
The chains 14 are hung in an endless manner by being attached to the chain 14 at required intervals in the longitudinal direction of the chain 14, and the scraper plates 11 of the scraper units 12 adjacent to each other in the longitudinal direction of the chain I4 are The mounting positions in the width direction of the cooling chamber 5 are arranged so that they are offset by half a pitch as shown in Fig. 2.3, and each has a required inclination angle when viewed from above.

A blower duct 16 having a blower port 15 for blowing low-humidity air to the aggregates conveyed in the cooling chamber 5 by the aggregate conveying device 10 is provided in the cooling chamber 5,
An exhaust port 17 is provided for discharging the air 21 from which moisture has been removed from the surface of the aggregate 6 sent into the cooling chamber 5 from the ventilation duct 16 to the outside, and an air supply device 20 is connected to the ventilation port 15. .

Furthermore, a discharge port 19 is provided for discharging the aggregates transported in the cooling chamber 5 by the aggregate transport device IO onto the transport device 3 leading to the batcher plant 1 via a transport device I8.
It is provided at the bottom of the cooling chamber 5.

Next, the operation of the above embodiment will be explained.

Aggregates 6 fed from the stockyard 2 (see Figure 4) into the hopper 7 by the conveyor 3 are evenly distributed in the width direction of the cooling chamber 5 by the rotating dispersion screw 8, and are sent to the cooling chamber via the feeder 9. A fixed amount is cut out within 5 minutes.

The aggregate 6 cut into the cooling chamber 5 in fixed quantities is sequentially stirred from one longitudinal end of the cooling chamber 5 to the other end by a bear-shaped scraper unit 12 having a large number of scraper plates 11. transported.

While the aggregate 6 is being conveyed through the cooling chamber 5 by the aggregate conveying device 10, the air supply device 20 is sending low-humidity air into the cooling chamber 5 from the air outlet 15 through the air duct 16. Low-humidity air efficiently contacts the water adhering to the surface of the aggregate 6.

Therefore, the vaporization of the water adhering to the surface of the aggregate 6 is promoted, and the heat of vaporization is taken away, thereby uniformly cooling the aggregate 6.

When the aggregate 6 cooled by the heat of vaporization of the water is conveyed to the other end in the longitudinal direction of the cooling chamber 5 by the aggregate conveying device IO, it is transferred from the conveying port 19 to the conveying device 3 via the conveying device 18. and is supplied to the Hasocha Plant 1 (see Figure 4).

In this way, since the heat of vaporization of water on the surface of the aggregate is used by low-humidity air, the cooling speed and cooling efficiency are higher than conventional cold air cooling, and it is also possible to use large-scale equipment such as turbid water treatment equipment and draining equipment. Since it does not require large-scale incidental equipment, the equipment scale is smaller and the equipment cost is lower than that of chilled water cooling.

Furthermore, it is extremely clean as it uses only the water and air on the surface of the aggregate, and the equipment is safe as there is no risk of oxygen deficiency during liquid nitrogen cooling or damage to the pressure vessel during vacuum cooling. It is highly economical, and especially in the case of fine aggregate, the surface water content of the fine aggregate is reduced by evaporation of water, making it difficult to control the quality of concrete. It is useful as a pre-cooling nog for concrete because it can increase the amount of water.

Incidentally, the aggregate cooling device of the present invention is not limited to the above-mentioned embodiments, but may be configured such that the aggregate cooling device is provided near the stockyard to cool and store the aggregate. Alternatively, an aggregate cooling device may be provided in a batcher plant to cool the aggregate transported to the batcher plant, and then produce ready-mixed concrete, etc. without departing from the gist of the present invention. Of course, various changes can be made therein.

[Effects of the Invention] As explained above, the aggregate cooling device of the present invention has the following effects:
Various excellent effects can be achieved as described below.

■ Since it uses the heat of vaporization of moisture on the surface of aggregates caused by low-humidity air, the cooling speed and cooling efficiency are higher than conventional cold air cooling.

■ Since it does not require large-scale incidental equipment such as turbid water treatment equipment or water draining equipment, the equipment scale is smaller and equipment costs are lower compared to cold water cooling.

■ It is extremely clean as only the water and air on the surface of the aggregate are used, and the equipment is also effective in preventing oxygen deficiency in liquid nitrogen cooling and since there is no risk of pressure vessel rupture in vacuum cooling. Excellent safety and economy.

■ Particularly in the case of fine aggregate, the surface water content of the fine aggregate is reduced by evaporation of water, making it easier to control the quality of the concrete.Also, since the amount of mixing water with cold water can be increased accordingly, it can be used as a pre-cooling agent for concrete. It will be advantageous.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, FIG.
The figure is an overall schematic diagram of a batcher plant according to an embodiment of the present invention, and FIG. 5 is an overall schematic diagram of a general batcher plant. 1 is a batch plant, 2 is a stockyard, 3 is a conveyance device, 4 is an aggregate cooling device, 5 is a cooling room, 6 is a t44.
7 is a hopper, 9 is a tweeter (cutting device), 10 is an aggregate conveying device, If is a scraper plate, 12 is a scraper unit, I5 is an air outlet, 16 is an air duct, 17 is an exhaust port, 19 is an outlet, 2o indicates an air supply device, and 21 indicates air.

Claims (1)

[Scope of Claims] 1) A hopper that receives supplied aggregate; a cutting device that cuts the aggregate received by the hopper into a cooling chamber; and a cutting device that cuts the aggregate that is cut out by the cutting device into the cooling chamber. an aggregate conveying device capable of being conveyed; a blower duct having an air outlet for blowing low-humidity air onto the aggregates conveyed in the cooling chamber by the aggregate conveyor; and bones sent from the blower duct into the cooling chamber. An exhaust port for discharging air from which water has been removed from the surface of the material to the outside of the cooling chamber, and an outlet for transporting the aggregates conveyed inside the cooling chamber by the aggregate conveying device to the outside of the cooling chamber. An aggregate cooling device characterized by: