JP2000199694A - Sand particle cooling device - Google Patents

Abstract

(57) [Summary] To provide a cooling device excellent in maintainability, processing efficiency, and the like, used for cooling high-temperature sand particles such as mold sand generated in a foundry. A water supply / drainage pipe (16) is provided in a circumferential space (15) of a horizontal drum (10) comprising an inner cylinder (11) and an outer cylinder (13).
It has a cooling structure for flowing cooling water through (17).
The inner wall surface of the inner cylindrical body (11) is provided with a sand particle sending blade (12). The horizontal drum (1) by the rotary drive device (30)
Under the rotation motion of 0), the sand (S) is the inner cylindrical body from the front end side.
It is continuously fed into (11), and moves to the rear end side while being repeatedly lifted and dropped by the feed blade (12) as the horizontal drum (10) rotates. It is cooled and discharged from the rear end side by repeatedly receiving the heat conduction effect at the time of contact with the inner cylinder body (11) and the heat radiation effect by aeration at the time of falling. The structure is simple and the maintenance burden is minimal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Detailed description of the invention]

[0002]

2. Description of the Related Art In a foundry, a large amount of mold sand generated in a mold separating operation process for removing a casting from a mold,
Collected and subjected to regeneration processing. The mold sand immediately after being collected is extremely hot (for example, 300 to 500 ° C.)
In this case, the treatment operation in the next step is hindered, so that it is necessary to cool this to an appropriate temperature (around normal temperature).

FIG. 3 shows a typical conventional cooling device used for the cooling process. Chamber (61)
Has a sand inlet (62) at the front end of the ceiling and a sand outlet (63) at the rear end of the bottom. Cooling water pipes (64) are provided in the internal space in the vertical and width directions (perpendicular to the paper). Are arranged at regular intervals in the direction (i. Further, the bottom of the chamber (61) is formed of a mesh (65), and cool air (66) is blown from the lower side in a direction inclined to the rear end of the chamber. It is configured to vibrate up and down by a device (not shown). Sand (S) placed in chamber (61)
Is cooled while floating in the space, and the rear outlet
It is discharged from (63) to the outside.

[0004]

The most problematic point in the sand cooling operation by the above-mentioned cooling device is that the cooling water pipe (64) is liable to block the flow path due to the adhesion of sludge to the inner surface of the pipe. The number of cooling water pipes (64) is about 100 to 200 even with a device of a general size. When such a trouble occurs in the cooling water pipe (64), even if it is a part of the pipe, the entire pipe must be removed from the chamber (61) in order to perform the repair work. The repair work requires a great deal of cost and labor. Further, it cannot be said that the above-mentioned apparatus can satisfy the cooling processing efficiency. In order to efficiently regenerate a large amount of mold sand generated from a foundry and improve the economics of foundry sand,
It is necessary to reduce the maintenance burden and further improve the processing efficiency. SUMMARY OF THE INVENTION The present invention provides a cooling device for solving the above-mentioned problems relating to the cooling treatment of high-temperature sand particles such as mold sand.

[0005]

The sand / granule cooling device of the present invention, while rotating the horizontal drum about its axis, inputs the sand / grain from one opening end (front opening end) and puts the other into the other. What is claimed is: 1. A sand and grain cooling device for cooling while moving toward an opening end (rear opening end) and discharging the sand from a rear opening end, wherein a horizontal drum (10) removes sand particles from a front opening end side to a rear opening end. An inner cylindrical body (11) in which a feed blade (12) to be moved to the end is formed on the inner surface, and a circumference space (15) is concentrically surrounded around the inner cylindrical body (11). A water supply / drainage pipe through which cooling water flows in the circumferential space (15), and the inner cylindrical body (1) is provided by the flow of cooling water in the circumferential space.
1) has a double wall water cooling structure for forced cooling
In the process of moving the sand particles, which are repeatedly lifted and dropped by the feed blades (12) with the rotation of (10), the inner cylindrical body
Cooling is performed by conduction heat transfer at the time of contact with (11) and heat radiation by aeration at the time of drop.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. 1 and 2 (FIG. 1: axial section, FIG. 2: radial section) showing an embodiment. The horizontal drum (10) has an inner cylinder (1).
1) and an outer cylindrical body (13) concentrically surrounding the inner cylindrical body (11) and an inner cylindrical body (11) and an outer cylindrical body (1).
3) forms a circumferential space (15) between the wall surfaces. In the circumferential space (15), a water supply pipe (16) is attached to one open end, and a drain pipe (17) is attached to the other open end. Reference numeral (30) denotes a rotary drive device, which comprises a rotary wheel (31) and a rotary wheel drive motor (32) connected to the rotary wheel, and the horizontal drum (10) is held on the rotary wheel (31). On one open end (front open end) side of the horizontal drum (10) held by the rotating wheel (31), a sand particle input device (21) is arranged, and on the other open end (rear open end) side. There is a sand particle collection machine
(22) is arranged.

[0007] The inner cylindrical body (11) of the horizontal drum (10) has a sand particle sending blade (12) on its inner wall surface. Feed blade
(12) is a flat plate having a substantially rectangular shape, and an inner cylindrical body (11).
An appropriate inclination angle with respect to the axial direction and the radial direction (for example,
Axial angle α: 5 to 15 °, radial angle β: 5 to 2
0 °) and is attached so as to draw a spiral along the inner wall surface. A member (14) is provided on the front opening end side of the circumferential space (15). The member (14)
Is a deformed auxiliary member composed of an annular portion (141) having substantially the same diameter as the inner cylindrical body (11) and a donut-shaped portion (142) orthogonal to the annular portion (141). The annular portion (141) is connected to the outer cylinder (1).
3) and the step between the inner cylinder (11) is eliminated, and the doughnut-shaped portion (142) is filled with sand particles by a horizontal drum (1).
0) to prevent spilling outside.

The sand particles fed into the inner cylinder (11) of the horizontal drum (10) by the sand particle feeder (21) are fed along with the rotation of the horizontal drum (10) around the axis x. It is lifted by the blade (12) and slides down the plate surface of the feed blade (12) on its way to the zenith position, and the dropped sand particles are again lifted by the feed blade (12) (FIG. 2). Sand grains are
The horizontal drum (10) moves to the rear opening end side while repeating lifting and dropping by the feed blade (12).

As shown in FIG. 2, a water supply pipe (16) for supplying cooling water to a circumferential space (15) of the horizontal drum (10) is located at an axial center (rotation center) of the horizontal drum (10). And radially extends radially from the opening and communicates with the open end of the circumferential space (15). The figure shows an example consisting of four tubes crossed in a cross. The pipe crossover is a rotary joint
It is connected to a water supply source via (18). Circumferential space (1
The drainage pipe (17) communicating with the other open end of (5) also has the same configuration, and is connected to the drainage treatment section via a rotary joint (18) at the intersection of the pipes. The inner cylindrical body (11) in contact with the high-temperature sand particles is cooled by the flow of cooling water in the circumferential space (15).

[0010] In the above cooling device, the sand-grain supply device (2)
The sand (S) that is continuously charged from 1) is an inner cylindrical body.
In addition to being cooled by conduction heat transfer due to contact with the inner wall surface of (11), when it is lifted and dropped by the feed blade (12), the contact area with air increases, and a cooling action by heat radiation is added. In addition, the sand particles are agitated as they fall, thereby promoting a cooling effect when the sand particles come into contact with the inner cylinder (11). In this way, the sand particles (S) are
1) In the process of moving to the rear end side in the inside, cooling is efficiently performed by repeatedly receiving a cooling action by conduction heat transfer and heat dissipation.

[0011] Unlike the cooling device having a large number of cooling water pipes as shown in Fig. 3, the cooling device is unlikely to cause troubles such as sludge adhesion and passage blockage, and maintains stable operation for a long period of time. Can be. Note that dust from sand particles is generated in the space of the inner cylinder (11) with the rotation. To suck and discharge the dust, a horizontal drum (1
0) A dust collecting hood (40) is provided at the rear open end as required. In this case, as a ventilation effect generated in the inner cylinder body (11), a cooling effect due to heat radiation of the sand particles can be enhanced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Using a cooling apparatus shown in FIG. 1, a mold sand immediately after being collected in a mold separating operation in a foundry is cooled. (1) Inner cylinder (made of cast steel): Inner diameter 1046, body length 2070, mm. The width between the walls of the circumferential space is 65mm. (2) Feed blade: inclination angle α10 °, inclination angle β15 °. (3) Rotation speed: 2 rpm (4) Cooling water flow rate: 2 tons / Hr (normal temperature) (5) Intake volume of dust collecting hood: 50 m ³ / Hr (6) Type sand (sand) Input temperature: about 500 ° C Discharge temperature (Set value): 50 ° C. or less (50 ° C. to 20 ° C.) Under the above cooling treatment conditions, predetermined cooling treatment can be stably performed under continuous supply of mold sand of 3 tons / Hr.

As a comparative example, the conventional apparatus shown in FIG. 3 (provided that the chamber capacity: 5 m ³ , the flow rate of the cooling water: 15 tons / Hr, the air volume:
The mold sand is cooled by 50m ³ / Hr). In this device, mold sand (however, charging temperature: about 300 ° C)
The throughput when cooling below 0 ° C is limited to about 10 tons / Hr or less. Beyond that, the sand discharge temperature cannot be maintained below 50 ° C. The sand temperature is about 500
The throughput at ° C is further limited.

[0014] The cooling capacity (ton / Hr) of the mold sand in the invention example and the comparative example was determined by the respective treatment tank volumes (inner cylinder volume of the invention example: 1.78 m ³ , chamber volume of the comparative example: 5 m ³ ).
The results are shown in Table 1 in terms of cooling water flow rate (invention example: 2 tons / Hr, comparative example: 15 tons / Hr), and a better treatment efficiency is obtained by the apparatus of the invention example. . Injection temperature of mold sand in comparative example (300 ° C)
Is at the same level (about 500 ° C.) as that of the invention example, the difference between the two processing efficiencies is further increased.

[0015]

[Table 1]

[0016]

According to the cooling device of the present invention, the trouble of blocking the cooling water flow path unlike the conventional cooling device having a large number of cooling water pipes is hardly caused, the maintenance burden is greatly reduced, and the continuous operation is realized. In addition to being able to maintain stability, the cooling efficiency of the sand particles can be increased, and this has a great effect on the efficiency of the recycling of foundry sand in the foundry.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an embodiment of a cooling device of the present invention.

FIG. 2 is an explanatory sectional view in a radial direction of the cooling device of FIG. 1;

FIG. 3 is a front sectional view showing a conventional cooling device.

[Explanation of symbols]

 10: Horizontal drum 11: Inner cylinder 12: Feed blade 13: Outer cylinder 14: Auxiliary member 15: Circumferential space 16: Water supply pipe 17: Drainage pipe 18: Rotary joint 21: Sand particle feeder 22: Sand particle collection Machine 30: Horizontal drum rotating drive 31: Rotating wheel 32: Rotating wheel drive 40: Dust collecting hood 61: Chamber 62: Sand inlet 63: Sand outlet 64: Cooling water pipe 65: Mesh 66: Cold air S: Sand

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsumi Goto 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Inside Kubota Hirakata Plant Co., Ltd. (72) Shoichi Sato 1-1-1 Nakamiya Oike, Hirakata City, Osaka Prefecture No. 1 Inside Kubota Hirakata Manufacturing Co., Ltd. (72) Inventor Shigenori Kawamo 1-1-1 Nakamiya Oike, Hirakata City, Osaka Prefecture F-term (Reference) 3L103 AA31 AA37 BB01 CC02 CC35 DD08 DD27 DD38

Claims (2)

[Claims] 1. While rotating a horizontal drum about its axis, sand is thrown in from one opening end (front opening end) and moved toward the other opening end (rear opening end). A sand particle cooling device for cooling while discharging from a rear opening end, wherein a horizontal drum (10) includes a feed blade (12) for moving sand particles from a front opening end side to a rear opening end side on an inner surface. The inner cylindrical body (11) is formed and an outer cylindrical body (13) concentrically surrounding the inner cylindrical body (11) to define a circumferential space (15). A water supply / drainage pipe for circulating cooling water in the circumferential space (15) is provided, and has a double wall water cooling structure for forcibly cooling the inner cylinder (11) by the cooling water flow in the circumferential space. ) During the movement of the sand particles, which are repeatedly lifted and dropped by the feed blades (12) due to the rotation of Sand product cooling device so as to cool the heat radiation by the aeration during the conduction heat transfer and fall. 2. A dust collecting hood (40) for sucking and discharging dust generated from sand particles in the space of the inner cylinder (11) is provided at the rear opening end side of the horizontal drum (10). 2. The sand / particle cooling apparatus according to 1.