JP3386902B2 - Aggregate cooling device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cooling aggregate in ready-mixed concrete production equipment. 2. Description of the Related Art FIG. 7 schematically shows an example of a ready-mixed concrete production facility, wherein 1 is a batcher plant, and 2 is a stockyard for aggregate and the like. The batcher plant 1 has a predetermined mixing ratio of cement, water, sand, and gravel, which are raw materials of ready-mixed concrete, and an admixture for improving the fluidity and other properties of ready-mixed concrete. And weigh
These materials are kneaded by a mixer to produce ready-mixed concrete. The stock yard 2 stores fine aggregate (sand) 3 and coarse aggregate (gravel) 4 which are raw materials of ready-mixed concrete. The fine aggregate 3 and the coarse aggregate 4 are stored on a belt conveyor. Batcher plant 1 by transfer devices 5 and 6 such as
It is supplied to. [0005] The ready-mixed concrete produced in the above-mentioned batcher plant 1 is transported to a place where the ready-mixed concrete is to be placed, and is placed therein. However, when constructing a large-scale concrete structure, cement concrete is used. A large temperature change occurs in the concrete after casting due to the heat of hydration, and in some cases, cracks due to the temperature change may occur, thereby impairing the function and durability of the concrete structure. As a means for solving such a problem, the batcher plant 1 is used as a raw material for ready-mixed concrete.
Pre-cooling is performed in which aggregates such as fine aggregates 3 and coarse aggregates 4 and the like, cement, water, etc., which are supplied to the concrete, are cooled in advance prior to the kneading operation, and the rise in temperature during kneading of the ready-mixed concrete is suppressed. Is being done. Conventionally, means for cooling aggregate applied to pre-cooling of ready-mixed concrete include: 1) cooling by spraying or immersion of cold water (cold water cooling) 2) cooling with extremely low temperature liquid nitrogen (liquid nitrogen cooling) 3 ) The inside of a container filled with raw materials (aggregate) is decompressed until it is close to a vacuum, the boiling point of water is lowered to about room temperature, and cooling using the heat of vaporization when moisture attached to the aggregates evaporates (vacuum cooling) and so on. However, the following problems have been pointed out in the above-mentioned cooling means. 1) Cold water cooling, requiring a large-scale cooling plant. -Large capacity auxiliary equipment (supply / drainage, turbid water treatment, dehydration treatment) is required. 2) Liquid nitrogen cooling and running costs are high.・ Liquid nitrogen has high pressure and extremely low temperature, which makes it difficult to handle.・ Large loss during cooling. 3) It is difficult to perform vacuum cooling and uniform cooling of the aggregate. -The initial cost of the equipment is high.・ It is difficult to control the surface water of aggregate. The present invention has been made in view of the above circumstances, and has as its object to provide an aggregate cooling device capable of efficiently cooling aggregate serving as a raw material of ready-mixed concrete. [0013] To achieve the above object, an aggregate cooling device according to the present invention comprises a tower-shaped cooling device main body and an aggregate cutting device provided at a lower end portion of the cooling device main body. An outlet hopper, an aggregate input hopper provided at an upper end of the cooling device body, an air supply port provided near a lower end portion of the cooling device body, and an air outlet provided near an upper end portion of the cooling device body. And an air supply device for supplying a low-humidity or low-temperature air flow to the air supply port, so as to maintain an interval at which the aggregate can pass through a plurality of horizontally-shaped round bar-shaped cushioning materials, and Aggregate dispersing devices arranged side by side so as to be able to rotate in the circumferential direction are arranged in the cooling device main body such that the cushioning materials of the adjacent aggregate dispersing devices in a plurality of stages in the vertical direction face different directions. On each lower side of each cushioning material Further, a scraper member facing the cushioning material is provided over substantially the entire length of the cushioning material. In the aggregate cooling device according to the present invention, the bone to be cooled from the aggregate input hopper into the cooling device body while the air supply device supplies a low humidity or low temperature air flow to the air supply port. When the aggregate is supplied, the aggregate collides with the buffer material of each aggregate dispersing device and falls inside the cooling device main body while being dispersed. At this time, when a 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, whereby:
The moisture on the surface of the aggregate is vaporized, and the latent heat of vaporization when the moisture is vaporized lowers the temperature of the aggregate to cool the aggregate substantially uniformly. When the air is supplied, the low-temperature air flowing into the cooling device main body touches the surface of the aggregate, whereby the aggregate is cooled substantially uniformly, and the low-humidity or low-temperature air The aggregate cooled by the process is stored in the aggregate cutting hopper. Further, when each cushioning material is rotated in the circumferential direction,
Aggregate attached to the outer peripheral surface of each cushioning material or powder obtained by breaking the aggregate is removed by the scraper member. Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 6 show an embodiment of an aggregate cooling device according to the present invention. In this embodiment, a cooling device body 7, an aggregate dispersing device 8, an aggregate cutting hopper 9, an aggregate Input hopper 1
0, an air supply device 11 is provided. The cooling device main body 7 is a tower-like body having a hollow structure which is erected substantially vertically, and contains therein an aggregate dispersing device 8.
Are arranged over a plurality of stages at predetermined intervals in the vertical direction. The aggregate input hopper 10 is provided at the upper end of the cooling device main body 7 through an upper air chamber 21 which will be described later. The aggregate input gate 12 provided at the lower portion of the aggregate input hopper 10 is provided. Is released, the aggregate input hopper 1
The aggregate 13 stored in the inside of the cooling device main body 7 is put into the cooling device main body 7. A transport device 14 such as a belt conveyor extending from a stock yard (not shown) is laid directly above the aggregate input hopper 10, and is stored in the stock yard by the transport device 14. The aggregate 13 is supplied to the aggregate input hopper 10. The aggregate extracting hopper 9 is provided at the lower end of the cooling device main body 7 via a lower air chamber 20 described later, and is provided at the lower portion of the aggregate extracting hopper 9. When the gate 15 is opened, the aggregate 13 stored in the aggregate extraction hopper 9 is cut out of the cooling device main body 7. A conveyor 16 such as a belt conveyor is provided between the above-mentioned aggregate extracting hopper 9 and a batcher plant (not shown). 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. The cooling device main body 7 has four column members 17 made of angle irons, each extending substantially vertically, and having substantially the same length. The column members 17 are erected so that the planar shape of the space to be formed is substantially square and the corners of the angle iron are located at the four vertices of the square, and surround the space from all sides. Side wall members 18 are respectively disposed between the members, and each side wall member 18 has a structure in which the side wall members 18 are fixed so as to be in contact with the flange portion of the angle steel that forms the column member 17. In each of the side wall members 18, rows of fitting holes 19 (see FIG. 3) arranged at substantially equal intervals in the horizontal direction are opened in a plurality of steps at predetermined intervals in the vertical direction. The hole rows of the fitting holes 19 arranged in the horizontal direction are arranged in the same side wall member 18 so that the horizontal hole interval (hole pitch) in the vertically adjacent hole rows is shifted by a half pitch. . Also, in the adjacent side wall member 18, the vertical interval (hole row pitch) of the fitting holes 19 in one side wall member 18 is different from the vertical direction of the fitting holes in the other side wall member 18. The hole row interval is shifted by a half pitch. However, the side wall members 18 and 1 opposed to each other are provided.
8, a fitting hole 1 in both side wall members 18, 18
9 correspond to each other. Each of these fitting holes 19 has a shape into which a buffer material mounting plate 36 constituting the aggregate dispersing device 8 described later can be fitted. Further, a lower air chamber 20 is provided at a lower end portion of the cooling device main body 7, and an upper air chamber 21 is provided at an upper end portion of the cooling device main body 7. The lower air chamber 20 has an external structure 22 having a box structure and a rectangular frame-shaped internal structure having substantially the same planar shape as the cooling device main body 7 and penetrating the external structure 22 in the vertical direction. 23, and an air flow path 24 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, an air supply port 25 for communicating the outside with the inside is provided.
On both side surfaces of the internal structure 23, the air flow passage 24 penetrates inward of the internal structure 23 and the current plate 26.
Is provided. The air supply device 11 is connected to the air supply port 25 of the lower air chamber 20, and the air flow S discharged from the air supply device 11 passes through the air inlet 27 of the lower air chamber 20. Of the cooling device main body 7 from below to above. The upper air chamber 21 has an external structure 28 having a box structure and a rectangular frame-shaped internal structure having substantially the same planar shape as the cooling device main body 7 and penetrating the external structure 28 in the vertical direction. 29, and an air flow path 30 between an inner portion of the outer structure 28 and an outer portion of the inner structure 29.
Is formed. On one side surface of the outer structure 28, an air outlet 31 for communicating the outside with the inside is provided.
Each side surface of the internal structure 29 is provided with an air outlet 33 which penetrates from the inside of the internal structure 29 to the air flow path 30 and has a rectifying plate 32. The airflow S flowing upward from below is discharged from the air outlet 31 through the upper air chamber 21 through the air outlet 33 to the outside. The air outlet 31 may be connected to the air supply device 11 via an air conditioner to circulate the airflow S without discharging the airflow S to the outside. The structure of the aggregate dispersing device 8 will be described in detail. The aggregate dispersing device 8 has a plurality of cylindrical cushioning members 34 extending substantially horizontally in parallel with each other.
5, the main body portion of the cushioning member 34 is located inside the cooling device main body 7, and the side wall member 1 whose both end portions face each other.
The cushioning members 34 are arranged so as to fit into the fitting holes 19 forming a row of holes on the side wall 8, respectively, and the bearing 35 is connected 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 member mounting plate 36 has a projection having a shape adapted to the fitting hole 19 on the side of the cooling device main body 7 that comes into contact with the side wall member 18, and the shaft of the cushioning member 34 is provided substantially at the center. Hole 37 through which the bearing 35 can be inserted.
And a slit 39 cut from the lower side toward the center to insert a scraper member 49 described later. Therefore, the aggregate dispersing device 8 is provided inside the cooling device main body 7 in a plurality of stages in the vertical direction.
Is that the mounting direction of the cushioning material 34 is 9 in the vertically adjacent ones due to the arrangement of the fitting holes 19 described above.
It turns to a direction different by 0 °. Similarly, due to the arrangement of the fitting holes 19,
In the cushioning material 34 extending in the same direction, the interval between the upper row and the lower row adjacent in the vertical direction is shifted by a half pitch. The cushioning member 34 is made of, for example, a stainless steel pipe (SUS304) or an ultra-high polymer resin pipe (with a steel pipe core).
It is preferable to use a material to which the aggregate 13 does not easily adhere. A driven sprocket 40 is attached to one end of the cushioning material 34 constituting each of the aggregate dispersing devices 8 described above, and forms a surface of the cooling device main body 7 on which the driven sprocket 40 is provided. Floating sprockets 41 are pivotally supported on the cushioning material mounting plates 36 mounted on both end portions in the width direction of the side wall member 18 among the cushioning material mounting plates 36 mounted on the side wall member 18. Further, a motor 43 having a driving sprocket 42 corresponding to the driven sprocket 40 is provided in the cooling device body 7 as a driving means of the cushioning member 34, and the rotational force of the motor 43 is controlled by the driving sprocket 4
2. The endless chain 44 wound around the driven sprocket 40 and the floating sprocket 41 allows each cushioning material 3
4. As shown in FIG. 6, the motor 43 has one leg in the width direction pivotally supported by a support pin 45, and the other leg stands upright on the surface of the side wall member 18. The endless chain 44 wound around the drive sprocket 42 can be adjusted by tightening the bolt 46 mounted on a motor mount 47 supported so that the height can be adjusted by bolts 46. It has become. A guide rail 48 is provided on the driven sprocket 40 so as to face the endless chain 44 with the endless chain 44 interposed therebetween. The guide rail 48 is formed so that the endless chain 44 does not rise from the driven sprocket 40. Further, each of the aggregate dispersing devices 8 has a scraper member 4 disposed under each of the cushioning members 34 at a very small distance from the outer peripheral surface of the cushioning member 34.
9 are provided over the entire length of the cushioning material 34. The entire length of the scraper member 49 is formed to be longer than the interval between the side wall members 18 and 18 facing each other, and the scraper members 49 are disposed at both ends in parallel with each other at a predetermined interval in the width direction. A scraper fixing pin 50 penetrating through the member 49 is provided, and 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 is connected to the side wall member 18. The scraper tensioning device 51 is mounted therebetween. The scraper tensioning device 51 includes a pedestal plate 52 fixed to the side wall member 18 of the scraper fixing pin 50 and having a bolt screw hole at the center thereof, and screwed into the bolt hole of the pedestal plate 52 to form a side wall member. The bolt 53 is formed upright with respect to the bolt 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, the aggregate supply gate 12 is opened and the aggregate supply gate 12 is opened by supplying the low humidity or low temperature air flow S to the air supply port 25 by operating the air supply device 11. When the aggregate 13 to be cooled is thrown into the cooling device main body 7 from the input hopper 10, the aggregate 13 collides with the buffer material 34 of each aggregate dispersing device 8 and disperses while falling inside the cooling device main body 7. I 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 supply 5 flows into the lower air chamber 20 from the air supply port 25, flows into the cooling device main body 7 through the air flow inlet 27 of the lower air chamber 20, and is cooled. The air flow S flowing from the lower part to the upper part of the main body 7 and reaching the upper part of the cooling device main body 7 flows from the air outlet 33 to the upper air chamber 21.
Through the air discharge port 31 to the outside. At this time, if the air flow S supplied from the air supply device 11 is a low-humidity air flow S, the low-humidity air flow S that has flowed into the cooling device main body 7 is applied to the aggregate 13.
When the surface of the aggregate 13 is touched, the moisture on the surface of the aggregate 13 evaporates,
The temperature of the aggregate 13 decreases due to the latent heat of vaporization when the moisture evaporates, and the aggregate 13 is cooled substantially uniformly. When the air flow S supplied from the air supply device 11 is a low temperature air flow S, the low temperature air flow S flowing into the cooling device body 7 By touching the surface, the aggregate 13 is cooled substantially uniformly. As described above, the aggregate 13 cooled by the low-humidity or low-temperature air flow S is supplied to the aggregate cutting hopper 9.
Is stored inside. Thus, if necessary, the aggregate cutting hopper 9
By opening the aggregate cutout gate 15 provided at the lower part of the aggregate, the aggregate 13 stored inside the aggregate cutout hopper 9 is cut out of the cooling device main body 7 and the cutout bone is cut out. The material 13 is supplied to a batcher plant (not shown) by a transport device 16 installed immediately below the aggregate cutting hopper 9. At this time, when each motor 43 is activated to drive the driving sprocket 42 and drive the driven sprocket 40 via the endless chain 44, each buffer member 34 is rotated in the circumferential direction. The aggregate 13 or the powder of the aggregate 13 that has adhered to the outer peripheral surface of the aggregate 34 is scraped off by the scraper member 49 and removed. In the present embodiment, the falling speed of the aggregates 13 is suppressed by the aggregate 13 injected into the cooling device main body 7 colliding with the cushioning material 34 of each of the aggregate dispersing devices 8 and the dispersion speed is reduced. As a result, the area in contact with the airflow S increases, so that the aggregate 13 can be efficiently cooled. When the cushioning members 34 are rotated in the circumferential direction, the aggregate 13 or the powder of the aggregates 13 adhered to the outer peripheral surface of each cushioning member 34 is removed by the scraper member 49, so that the adhered substance is removed. Can be prevented, and the aggregate dispersing device 8 is not blocked by the aggregate 13 or the like. It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention. According to the aggregate cooling device of the present invention, various excellent effects as described below can be obtained. I) The aggregate put into the cooling device main body collides with the cushioning material of each of the aggregate dispersing devices and falls inside the cooling device main body while being dispersed, so that the falling speed of the aggregate is suppressed,
The surface area of the aggregate in contact with the air flow increases, and the aggregate can be cooled efficiently. II) When the cushioning material is rotated in the circumferential direction, the aggregate attached to the outer peripheral surface of each cushioning material or the powder of the broken aggregate is removed by the scraper member, so that the growth of the attached matter can be prevented. Therefore, the aggregate dispersing device is not blocked by the aggregate or the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view schematically showing an embodiment of an aggregate cooling device according to the present invention. FIG. 2 is a perspective view illustrating an arrangement relationship of an aggregate dispersing device and the like related to FIG. 1; FIG. 3 is a configuration diagram of an aggregate dispersing device related to FIG. 1; 4 is a view taken in the direction of arrows IV-IV in FIG. 3; FIG. 5 is a view taken in the direction of arrows VV in FIG. 3; FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 3; FIG. 7 is a side view schematically illustrating an example of a ready-mixed concrete production facility. [Description of Signs] 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 exhaust port 34 Buffer material 49 Scraper member

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Heiji Doi 3174 Showa-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Pref. Ishikawajima Construction Machinery Co., Ltd. (56) References -197704 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B28C 7/00

Claims (1)

(1) A tower-shaped cooling device main body, an aggregate cutting hopper provided at a lower end portion of the cooling device main body, and a bone provided at an upper end portion of the cooling device main body. A material input hopper, an air supply port provided near a lower end portion of the cooling device main body, an air discharge port provided near an upper end portion of the cooling device main body, and a low humidity or low temperature air flow to the air supply port. And an air supply device for supplying the aggregates, the aggregates being arranged side by side so as to keep a space through which the aggregates can pass through a plurality of round bar-shaped cushioning members extending in the horizontal direction and to be able to rotate in the circumferential direction. The dispersing device is disposed in the cooling device main body such that the cushioning materials of the aggregate dispersing devices vertically adjacent to each other in a plurality of stages in the vertical direction face different directions, and the dispersing device is provided below each of the cushioning materials. Place the scraper member facing the cushioning material over almost the entire length of the cushioning material. Aggregate cooler, characterized in that digit.