JPH08112812A - Apparatus for cooling of aggregate - Google Patents

Abstract

PURPOSE: To cool efficiently aggregates for raw concrete by arranging cushioning materials in each aggregate dispersion apparatus adjoining upward and downward over a plurality of stages in a cooling apparatus main body so as to face the cushioning materials in different directions and providing a scraper member facing the cushioning materials on the lower side of each cushioning material over the whole length of the cushioning materials. CONSTITUTION: When each cushioning material 34 is rotated in the peripheral direction, aggregates 13 adhered on the outer peripheral face of the cushioning material 34 or powder generated by crushing of the aggregates 13 are scraped and removed by means of a scraper member 49. In this case, as the falling down velocity of the aggregates 13 is suppressed by making the aggregates 13 fed in a cooling apparatus main body 7 collide with cushioning materials 34 in each aggregate dispersion apparatus 8 and the area of the aggregates being brought into contact with air flow S is increased by dispersion of the aggregates, cooling of the aggregates 13 can be efficiently performed. In addition, when the cushioning materials 34 are rotated in the peripheral direction, the aggregates 13 adhered on the outer peripheral face of each cushioning material 34 or powder generated by crushing of the aggregates 13 are removed, the aggregates are prevented from being grown and there exists no possibility of clogging of an aggregate dispersing apparatus 8 with the aggregates 13, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aggregate cooling device for ready-mixed concrete manufacturing equipment.

[0002]

2. Description of the Related Art FIG. 7 schematically shows an example of ready-mixed concrete manufacturing equipment, 1 is a batcher plant, and 2 is a stockyard for aggregates.

The batcher plant 1 has a predetermined mixing ratio of cement, which is a raw material of fresh concrete, aggregate such as water, sand and gravel, and admixture for improving the fluidity and other properties of fresh concrete. And weigh
These materials are kneaded with a mixer to produce ready-mixed concrete.

In the stockyard 2, fine aggregates (sand) 3 and coarse aggregates (gravel) 4 which are raw materials for ready-mixed concrete are stored. These fine aggregates 3 and coarse aggregates 4 are belt conveyors. Batcher plant 1 by transfer devices 5 and 6
To be supplied to.

The ready-mixed concrete produced in the batcher plant 1 described above is conveyed to the place where the ready-mixed concrete should be placed and placed therein. When constructing a large-scale concrete structure, cement Due to the heat of hydration, a large temperature change occurs in the concrete after it is placed, and in some cases, cracks may occur due to the temperature change, which may impair the function and durability of the concrete structure.

As a means for solving such a problem, the above batcher plant 1 is used as a raw material for ready-mixed concrete.
The pre-cooling that cools the aggregates such as the fine aggregates 3 and the coarse aggregates 4 and the materials such as the cement, the water, etc., which are supplied to the pre-cooling prior to the kneading work and suppresses the temperature rise during the mixing of the fresh concrete. Has been done.

Conventionally, the aggregate cooling means applied to the pre-cooling of ready-mixed concrete includes 1) cooling by sprinkling or infiltrating cold water (cooling with cold water) 2) cooling with cryogenic liquid nitrogen (cooling with liquid nitrogen) 3 ) Cooling that uses the heat of vaporization when the water adhering to the aggregate evaporates (vacuum cooling) by depressurizing the container filled with the raw material (aggregate) until it is close to a vacuum, lowering the boiling point of water to around room temperature and so on.

[0008]

However, the above-mentioned cooling means have been pointed out to have the following problems.

1) Cold water cooling-A large-scale cooling plant is required. -A large amount of incidental equipment (water supply / drainage, muddy water treatment, dehydration treatment) is required.

2) Liquid nitrogen cooling-Running cost is high. -Liquid nitrogen has high pressure and very low temperature, so it is difficult to handle.・ Loss during cooling is large.

3) Vacuum cooling-It is difficult to uniformly cool the aggregate.・ The initial cost of the equipment is expensive.・ It is difficult to control the surface water of the aggregate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an aggregate cooling device capable of efficiently cooling an aggregate which is a raw material of green concrete.

[0013]

To achieve the above object, in the aggregate cooling device of the present invention, a tower-shaped cooling device main body and an aggregate cutting hopper provided at the lower end of the cooling device main body are provided. An aggregate feeding hopper provided at an upper end of the cooling device main body, an air supply port provided near a lower end part of the cooling device main body, an air discharge port provided near an upper end part of the cooling device main body, An air supply device for supplying an air flow of low humidity or low temperature to the air supply port, and to keep an interval through which the aggregate can pass through a plurality of round rod-shaped cushioning members extending in the horizontal direction, and to surround each of them. Aggregate dispersers arranged side by side so that they can rotate in any direction, and the cushioning materials of the aggregate dispersers that are vertically adjacent to each other in a plurality of stages in the vertical direction are arranged in the cooling device main body so as to face different directions. To the bottom of each cushion The 峙 to scraper member has a configuration provided over substantially the entire length of the buffer material.

[0014]

In the aggregate cooling device of the present invention, while supplying an air flow of low humidity or low temperature to the air supply port by the air supply device, the aggregate to be cooled is introduced into the cooling device main body from the aggregate introduction hopper. Then, the aggregate falls on the inside of the cooling device body while colliding with the cushioning material of each aggregate dispersing device and dispersing.

At this time, when the low-humidity air flow is supplied by the air supply device, the low-humidity air flow flowing into the cooling device main body touches the surface of the aggregate,
Moisture on the surface of the aggregate is vaporized, and the temperature of the aggregate is lowered by the latent heat of vaporization when the moisture is vaporized, so that the aggregate is cooled substantially uniformly. In the case of supplying air, the low-temperature air flow flowing into the cooling device body touches the surface of the aggregate, whereby the aggregate is cooled substantially uniformly, and the low-humidity or low-temperature air flow is supplied. The aggregate cooled by is stored in the aggregate cutting hopper.

Further, when each cushioning material is rotated in the circumferential direction,
The scraper member removes the aggregate attached to the outer peripheral surface of each buffer material or the powder crushed by the aggregate.

[0017]

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

1 to 6 show an embodiment of an aggregate cooling device of the present invention. In this embodiment, a cooling device body 7, an aggregate dispersing device 8, an aggregate cutting hopper 9, an aggregate are provided. Input hopper 1
0, an air supply device 11 is provided.

The cooling device body 7 is a hollow-structured tower which is erected substantially vertically, and the aggregate dispersion device 8 is provided inside thereof.
Are arranged in a plurality of stages at predetermined intervals in the vertical direction.

The aggregate feeding hopper 10 is provided at the upper end of the cooling device main body 7 via an upper air chamber 21 described later, and the aggregate feeding gate 12 provided below the aggregate feeding hopper 10. Opening the hopper 1
The aggregate 13 stored in the inside of the cooling device 0 is thrown into the inside of the cooling device body 7.

A conveyor 14 such as a belt conveyor extending from a stock yard (not shown) is installed right above the aggregate feeding hopper 10 and is stored in the stock yard by the conveyor 14. The aggregate 13 is supplied to the aggregate feeding hopper 10.

The aggregate cutout hopper 9 is provided at the lower end of the cooling device main body 7 via a lower air chamber 20 described later, and the aggregate cutout hopper 9 is provided below the aggregate cutout hopper 9. When the gate 15 is opened, the aggregate 13 stored inside the aggregate cutout hopper 9 is cut out to the outside of the cooling device body 7.

A conveyor 16 such as a belt conveyor is installed between the batcher hopper 9 and a batcher plant (not shown) directly below the aggregate cutting hopper 9. The aggregate 13 cut out from the hopper 9 is supplied to the batcher plant.

The structure of the cooling device main body 7 will be described in detail. In the cooling device main body 7, four pillar members 17 made of angle steel each extending substantially vertically and having substantially the same length are provided between the pillar members 17. Adjacent column members 17 are provided so that the plane shape of the formed space is substantially square and the angled portions of the angle steel are erected so as to be located at four vertexes of the square, and surround the space from four sides. Side wall members 18 are respectively disposed between the side walls, and each side wall member 18 is fixed so as to be in contact with the flange portion of the angle steel forming the pillar member 17.

In each of the side wall members 18, rows of fitting holes 19 (see FIG. 3) arranged in the horizontal direction at substantially equal intervals are opened in a plurality of stages at predetermined intervals in the vertical direction.

The hole rows of the fitting holes 19 arranged in the horizontal direction are arranged such that the hole intervals (hole pitch) in the horizontal direction in the adjacent hole rows in the vertical direction are shifted by a half pitch in the same side wall member 18. .

In addition, in adjacent side wall members 18, the vertical direction of the fitting holes in the other side wall member 18 with respect to the vertical hole row interval (hole row pitch) of the fitting holes 19 in one side wall member 18. The hole row interval is shifted by a half pitch.

However, the side wall members 18, 1 facing each other
8, the fitting hole 1 in the side wall members 18, 18
The opening positions of 9 are the same.

Each of these fitting holes 19 has a shape into which a cushioning material mounting plate 36 constituting the aggregate dispersing device 8 described later can be fitted.

Furthermore, a lower air chamber 20 is provided at the lower end of the cooling device body 7, and an upper air chamber 21 is provided at the upper end of the cooling device body 7.

The lower air chamber 20 has a box-shaped external structure 22 and a rectangular frame-shaped internal structure which has a plane shape substantially similar to that of the cooling device body 7 and which vertically penetrates the external structure 22. 23, and the air flow path 24 is provided between the inner portion of the outer structure 22 and the outer portion of the inner structure 23.
Is formed.

On one side surface of the external structure 22 is provided an air supply port 25 which communicates the outside with the inside, and
On both side surfaces of the internal structure 23, the air flow passage 24 penetrates inward of the internal structure 23 and the straightening vanes 26 are provided.
There is an air inlet 27 having

The air supply device 11 is connected to the air supply port 25 of the lower air chamber 20 described above, and the air flow S discharged from the air supply device 11 passes through the air inlet 27 of the lower air chamber 20 to reach the above-mentioned condition. The cooling device main body 7 is designed to flow upward from below.

The upper air chamber 21 has a box-shaped external structure 28 and a rectangular frame-shaped internal structure which has a plane shape substantially similar to that of the cooling device body 7 and which penetrates the external structure 28 in the vertical direction. 29, the air flow path 30 is provided between the inner portion of the outer structure 28 and the outer portion of the inner structure 29.
Is formed.

An air outlet 31 is provided on one side surface of the external structure 28 for communicating the inside and the outside, and
Each side surface of the internal structure 29 is provided with an air outlet 33 penetrating from the inside of the internal structure 29 to the air flow path 30 and having a rectifying plate 32. The air flow S flowing from below to above is discharged from the air outlet 33, the upper air chamber 21 and the air outlet 31 to the outside.

The air discharge port 31 may be connected to the air supply device 11 via an air conditioning facility so that the air flow S is circulated without being discharged to the outside.

The structure of the aggregate disperser 8 will be described in detail. In the aggregate disperser 8, the bearings 3 are provided at both ends of a plurality of columnar cushioning members 34 extending in parallel and substantially horizontally.
The side wall member 1 in which the main body portion of the cushioning material 34 is located inside the cooling device main body 7 and both end portions face each other.
Each cushioning member 34 is arranged so as to be fitted into each fitting hole 19 forming a row of holes in 8, and the bearing 35 is attached to the side wall member 18 via the cushioning member mounting plate 36 by fastening means such as bolts. It has a mounted structure.

The cushioning material mounting plate 36 has a projecting portion having a shape adapted to the fitting hole 19 on the surface side of the cooling device body 7 that abuts the side wall member 18, and the shaft of the cushioning material 34 is substantially at the center. Has a hole 37 through which the bearing is inserted,
Has a screw threaded hole 38 for attaching a screw, and a slit 39 cut from the lower side toward the center for inserting a scraper member 49 described later.

Therefore, the aggregate disperser 8 is provided inside the cooling device main body 7 in a plurality of stages in the vertical direction.
Due to the arrangement of the fitting holes 19 described above, the mounting direction of the cushioning material 34 is 9 in the vertically adjacent ones.
It will turn in a different direction by 0 °.

Similarly, due to the arrangement of the fitting holes 19,
The cushioning members 34 extending in the same direction are displaced by a half pitch between the upper row and the lower row that are vertically adjacent to each other.

The cushioning material 34 is, for example, a stainless steel pipe (SUS304) or a super polymer resin pipe (with a steel pipe core).
It is preferable to use such a material that the aggregate 13 is hard to attach.

The driven sprocket 40 is attached to one end of the cushioning material 34 constituting each of the above-mentioned aggregate dispersers 8, and also constitutes the surface of the cooling device body 7 on which the driven sprocket 40 is provided. Of the cushioning material mounting plates 36 mounted on the side wall member 18, the floating material sprockets 41 are pivotally supported by the cushioning material mounting plates 36 mounted on both ends of the side wall member 18 in the width direction.

Further, a motor 43 having a drive sprocket 42 corresponding to the driven sprocket 40 is provided in the cooling device main body 7 as a drive means for the cushioning member 34, and the rotational force of the motor 43 is the drive sprocket 4
2, the endless chain 44 wound around the driven sprocket 40 and the floating sprocket 41, and
4 is transmitted.

As shown in FIG. 6, the motor 43 has one leg side in the width direction rotatably supported by a support pin 45, and the other leg side stands upright with respect to the surface of the side wall member 18. The tension of the endless chain 44 wound around the drive sprocket 42 can be adjusted by being mounted on a motor mount 47 which is supported by a bolt 46 so that its height can be adjusted. It is like this.

A guide rail 48 is provided to face the driven sprocket 40 with the endless chain 44 sandwiched therebetween, and the endless chain 44 is formed so as not to rise from the driven sprocket 40.

In addition, in each aggregate disperser 8, the scraper member 4 that faces the outer peripheral surface of the cushioning material 34 at a very small distance under each cushioning material 34.
9 is provided over the entire length of the cushioning material 34.

The entire length of the scraper member 49 is longer than the interval between the side wall members 18, 18 facing each other, and both ends of each scraper member 49 are parallel to each other with a predetermined interval in the width direction. A scraper fixing pin 50 penetrating the member 49 is provided, and the both ends thereof are centered from the lower side of the cushioning material mounting plate 36 described above so that the scraper fixing pin 50 is located outside the side wall member 18. The scraper fixing pin 50 at one end is brought into direct contact with the outer surface of the cushioning material mounting plate 36, and the scraper fixing pin 50 at the other end and the side wall member 18 are inserted. A scraper tensioning device 51 is installed between them.

This scraper tensioning device 51 is fixed to the side wall member 18 side of the scraper fixing pin 50 and has a pedestal plate 52 having a bolt screw hole at the center, and a side wall member screwed into the bolt hole of the pedestal plate 52. It is formed by a bolt 53 that stands upright with respect to 18, and the tension of the scraper member 49 can be adjusted by tightening the bolt 53.

Next, the operation will be described.

In the production of ready-mixed concrete, by operating the air supply device 11, while supplying the air flow S of low humidity or low temperature to the air supply port 25, the aggregate feeding gate 12 is opened to open the aggregate. When the aggregate 13 to be cooled is introduced into the cooling device main body 7 from the input hopper 10, the aggregate 13 collides with the cushioning material 34 of each aggregate dispersion device 8 and disperses and falls inside the cooling device main body 7. To do.

From the air supply device 11 to the air supply port 2
The low-humidity or low-temperature air flow S supplied to the air conditioner 5 flows into the lower air chamber 20 from the air supply port 25, flows into the inside of the cooling device body 7 through the air inlet 27 of the lower air chamber 20, and cools the cooling device. The air flow S flowing through the inside of the main body 7 from the lower side to the upper side and reaching the upper part of the cooling device main body 7 is discharged from the air outlet 33 to the upper air chamber 21.
Through the air exhaust port 31 to the outside.

At this time, when the air flow S supplied from the air supply device 11 is the low-humidity air flow S, the low-humidity air flow S flowing into the cooling device body 7 is aggregate 13.
When the surface of the aggregate 13 is touched, the moisture on the surface of the aggregate 13 is vaporized,
The temperature of the aggregate 13 is lowered by the latent heat of vaporization when the moisture is vaporized, and the aggregate 13 is cooled substantially uniformly.

When the air flow S supplied from the air supply device 11 is the low-temperature air flow S, the low-temperature air flow S flowing into the cooling device body 7 is transferred to the aggregate 13. By touching the surface, the aggregate 13 is cooled substantially uniformly.

As described above, the aggregate 13 cooled by the air flow S of low humidity or low temperature is used as the aggregate cutting hopper 9.
Is stored inside.

Then, if necessary, an aggregate cutting hopper 9
By opening the aggregate cutting gate 15 provided at the lower part of the aggregate, the aggregate 13 stored inside the aggregate cutting hopper 9 is cut out to the outside of the cooling device main body 7, and the cut bone is cut out. The material 13 is supplied to a batcher plant (not shown) by a transfer device 16 installed just below the aggregate cutting hopper 9.

At this time, when each of the cushioning members 34 is rotated in the circumferential direction by activating each of the motors 43 to operate the driving sprocket 42 and driving the driven sprocket 40 via the endless chain 44, each cushioning member 34 is rotated in the circumferential direction. The aggregate 13 adhering to the outer peripheral surface of 34 or the powder obtained by crushing the aggregate 13 is scraped off and removed by the scraper member 49.

In this embodiment, the aggregate 13 put into the cooling device main body 7 collides with the cushioning material 34 of each aggregate disperser 8, whereby the falling speed of the aggregate 13 is suppressed and the aggregate 13 is dispersed. As a result, the area in contact with the air flow S is increased, so that the aggregate 13 can be cooled efficiently.

When the cushioning material 34 is rotated in the circumferential direction, the aggregate 13 attached to the outer peripheral surface of each cushioning material 34 or the powder crushed by the aggregate 13 is removed by the scraper member 49. Since the growth of the aggregate can be prevented, the aggregate disperser 8 is not blocked by the aggregate 13 or the like.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0060]

According to the aggregate cooling device of the present invention, various excellent effects as described below can be obtained.

I) Since the aggregate introduced into the cooling device main body collides with the cushioning material of each aggregate dispersing device and drops inside the cooling device main body while being dispersed, the falling speed of the aggregate is suppressed,
The surface area of the aggregate in contact with the air flow is increased, and the aggregate can be cooled efficiently.

II) When the cushioning material is rotated in the circumferential direction, aggregates attached to the outer peripheral surface of each cushioning material or powders crushed by the aggregates are removed by the scraper member, so that the growth of deposits can be prevented. Therefore, the aggregate disperser is not blocked by the aggregate or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an embodiment of an aggregate cooling device of the present invention.

FIG. 2 is a perspective view showing a positional relationship of an aggregate dispersing device and the like related to FIG.

FIG. 3 is a configuration diagram of an aggregate dispersing device related to FIG. 1.

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is a view taken along the line VV of FIG.

6 is a VI-VI arrow view of FIG. 3. FIG.

FIG. 7 is a side view schematically showing an example of ready-mixed concrete manufacturing equipment.

[Explanation of symbols]

 7 Cooling Device Main Body 8 Aggregate Dispersing Device 9 Aggregate Cutting Hopper 10 Aggregate Input Hopper 11 Air Supply Device 13 Aggregate 25 Air Supply Port 31 Air Discharge Port 34 Buffer Material 49 Scraper Member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Heiji Doi Ishikawa Kawashima Construction Machinery Co., Ltd. 3174 Showamachi, Kanazawa-ku, Yokohama-shi, Kanagawa

Claims (1)

[Claims] 1. A tower-shaped cooling device main body, an aggregate cutting hopper provided at a lower end of the cooling device main body, an aggregate feeding hopper provided at an upper end of the cooling device main body, and the cooling device main body. Has an air supply port provided near the lower end of the cooling device, an air discharge port provided near the upper end of the cooling device body, and an air supply device that supplies an air flow of low humidity or low temperature to the air supply port. In the cooling device main body, the aggregate dispersers are arranged side by side so that the aggregate can pass through a plurality of round rod-shaped cushioning members extending in the horizontal direction and each can rotate in the circumferential direction. In the vertical direction, the cushioning members of the aggregate dispersers that are vertically adjacent to each other over a plurality of stages are arranged so as to face in mutually different directions, and a scraper member facing the cushioning member is provided below each cushioning member, Characterized by being provided over substantially the entire length of the cushioning material Aggregate cooling device.