JP3329779B2 - Casting sand recycling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus suitable for reclaiming and cooling foundry sand.

[0002]

2. Description of the Related Art Conventionally, as one of regenerating apparatuses for self-hardening foundry sand, there is an apparatus in which a self-hardening foundry sand is rubbed to separate a binder from sand particles. On the other hand, in the regeneration of self-hardening molding sand using alkali phenol, phenol urethane, or the like as a binder, in recent years, it has been required to minimize the residual binder of the recycled sand as much as possible. In regenerating the self-hardening molding sand, it was necessary to rub the molding sand for a long time.

[0003] In general, in self-hardening molding sand,
The temperature of sand that can be used is limited due to the speed of the chemical reaction. Therefore, as described above, if the temperature rises due to friction of the foundry sand for a long time, the reclaimed sand cannot be used as self-hardening foundry sand immediately after the reclaiming treatment. It is necessary to cool the reclaimed sand when using the method. Conventionally, a cooling device is separately provided to cool the reclaimed sand after the regenerating treatment. As a result, there is a problem that the apparatus becomes large and expensive with a foundry sand recycling apparatus and a recycled sand cooling apparatus.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compact molding sand regenerating apparatus having a molding sand regenerating function and regenerated sand cooling.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a molding sand regenerating apparatus according to the present invention is an apparatus for regenerating and cooling molding sand, comprising fluidizing means for fluidizing molding sand. A cooling mechanism disposed at a position above the fluidizing means for cooling the fluidized molding sand; and a binder disposed at a position above the cooling mechanism for separating the binder from the molding sand particles by friction. Peeling means, dust settling means disposed at a position above the cooling mechanism and settling relatively large dust,
Wherein the binder peeling means is configured to be able to discharge molding sand to the fluidizing means.

[0006] When the recovered molding sand is charged into the binder removing means, the charged molding sand is rubbed and the binder is peeled off, and the friction processing is performed for a predetermined time. After that, it is discharged on the fluidization means. The discharged molding sand is fluidized and cooled by a cooling mechanism. On the other hand, relatively large dust is settled by the dust settling means and then discharged outside together with the regenerated sand.

[0007]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the molding sand regenerating apparatus of the present invention comprises a fluidizing means 1 for fluidizing the molding sand, and a cooling sand provided at a position above the fluidizing means 1 for cooling the fluidized molding sand. A cooling mechanism 2; a binder separating means 3 disposed above the cooling mechanism 2 for separating the binder from the foundry sand particles by friction; and a relatively large binder disposed above the cooling mechanism 2 And dust sedimentation means 4 for sedimenting dust.

The fluidizing means 1 comprises a box-shaped air storage tank 5, a partitioning member 6 for partitioning the air storage tank 5 up and down and having air permeability, and an exhaust port provided at the bottom of the air storage tank 5. And a blower 8 which is connected through a conduit 7 to the blower 8. A sand discharge port 9 is formed at the left end of the air storage tank 5.

The cooling mechanism 2 is composed of a number of pipes 10 horizontally arranged at the upper position in the air storage tank 5 and arranged vertically and through which cooling water flows.

The binder removing means 3 includes a vertically extending cylindrical processing tank 11 mounted at the upper end of the air storage tank 5 in communication with the air storage tank 5, and a middle processing tank 11 at the middle position in the processing tank 11. A sand centrifugal projection mechanism 12 that is disposed and centrifugally projects casting sand in a horizontal direction, and an annular sand storage member 13 that is mounted at a middle position in the processing tank 11 and stores sand that temporarily receives the centrifugally projected molding sand. And the sand centrifugal projection mechanism 12
As shown in FIG. 2, a rotating plate 14 having a strip fixed vertically to a peripheral portion thereof is horizontally rotated by a driving mechanism including a motor 15 and a transmission means 16 to centrifugally project sand. . The rotating plate 14 and the sand storage member 13
Is formed with a gap G of a required size.

The dust settling means 4 has a box-shaped settling tank 17 mounted above and in communication with the air storage tank 5 and a lattice structure mounted at a lower position in the settling tank 17. The air flow dispersing member 18 is provided.

As shown in FIG. 1, the inside of the settling tank 17 of the dust settling means 4 is connected to a dust collector (not shown) via a conduit 19. A hopper 21 with a slide gate 20 is provided above the treatment tank 11 of the binder removing means 3.
Is attached for communication. The inside of the processing tank 11 is connected to the conduit 7 via a branch pipe 22, and the interior of the processing tank 11 is connected to the conduit 19 via a communication pipe 23 and a conduit 24. The interior of the settling tank 17 is communicated with the conduit 24 via a communication pipe 25, and three opening / closing mechanisms 26 to 28 are mounted on the branch pipe 22 and the communication pipes 23 and 25, respectively. .

In the apparatus constructed as described above, the motor 15 of the binder removing means 3 is driven to rotate the rotary plate 14, and the opening and closing mechanisms 26 to 28 are used for the branch pipe 22 and the communication pipe 25.
And the communication pipe 23 is opened, and further, the blower 8 is driven to generate an airflow flowing in the direction indicated by the solid line, and the slide gate 20 of the binder release means 3 is turned off.
When the recovered molding sand S is thrown into the processing tank 11 of the binder removing means 3 by opening and closing the slide gate 20 of the hopper 21 with a hopper, the thrown molding sand S is centrifugally projected by the rotation of the rotary plate 14. , The sand storage member 1
The binder rubs off by colliding with the molding sand remaining in 3 and the binder is peeled off. The temperature of the molding sand S from which the binder was removed rose to, for example, about 100 ° C.

After the peeling of the binder is completed, the opening and closing mechanisms 26 to 28 are respectively operated to open the branch pipe 22 and the communication pipe 25 and to cut off the communication pipe 23 so that the airflow flowing in the direction of the dotted arrow is reduced. When this occurs, the inside of the lower part of the processing tank 11 is suctioned and decompressed, and the compressed air is supplied to the upper part of the processing tank 11 through the branch pipe 22, whereby the rotating plate 14 and the sand storage A pressure change occurs at the boundary of the member 13, and the pressure in the upper part of the processing tank 11 becomes higher than that in the lower part of the processing tank 11.

Along with this, the foundry sand S flows from the upper part of the processing tank 11 through the gap G into the lower part of the processing tank 11 and subsequently into the air storage tank 5 together with the airflow. The foundry sand S flowing into the air storage tank 5 is cooled by the cooling mechanism 2 while being fluidized and stirred by the fluidizing means 1. The temperature of the cooled molding sand S is, for example, about 30 ° C.
Descended. The casting sand S overflowing from the air storage tank 5 is discharged from the sand discharge port 9.

The casting sand S discharged from the sand discharge port 9
When the temperature is restricted, a temperature sensor is provided near the sand discharge port 9 and the temperature is measured. When the sand temperature rises above the set value, the processing amount is reduced, the processing cycle is extended, or the processing is temporarily stopped so that the sand temperature becomes the set value. On the other hand, the relatively large dust is
After being settled, the sand is discharged from the sand discharge port 9 to the outside together with the recycled sand.

[0017]

As is clear from the above description, the present invention provides a fluidizing means for fluidizing molding sand, and a cooling means disposed above the fluidizing means for cooling fluidized molding sand. A mechanism, a binder separating means disposed at a position above the cooling mechanism for separating the binder from the molding sand particles by friction, and a dust disposed at a position above the cooling mechanism for sedimenting relatively large dust. Settling means, and the binder peeling means is configured to be able to discharge molding sand to the fluidizing means, so that the molding sand can be regenerated and cooled, and the apparatus can be made compact, etc. Has an excellent practical effect.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing one embodiment of the present invention.

FIG. 2 is an enlarged detail view of a portion A in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluidization means 2 Cooling mechanism 3 Binder peeling means 4 Dust settling means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-318021 (JP, A) JP-A-59-169644 (JP, A) JP-A-60-18251 (JP, A) 195843 (JP, U) Japanese Utility Model Application Showa 56-147944 (JP, U) Table of International Publication No. 8-504131 (JP, A) US Patent 4,436,138 (US, A) US Patent 5,706,879 (US, A) (58) (Int.Cl. ⁷ , DB name) B22C 5/00-5/18

Claims (1)

(57) [Claims] An apparatus for regenerating and cooling foundry sand, comprising: a fluidizing means for fluidizing the foundry sand; and a cooling means disposed above the fluidizing means for cooling the fluidized foundry sand. A cooling mechanism, a binder removing means disposed at a position above the cooling mechanism for separating the binder from the molding sand particles by friction, and a relatively large dust settled at a position above the cooling mechanism And a dust settling means, wherein the binder removing means is configured to discharge the foundry sand to the fluidizing means.