JP3278107B2 - Foundry sand suction filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sucking and filling molding sand in a sand hopper into a model box which is sequentially fed by utilizing a suction action from the model box side.

[0002]

2. Description of the Related Art Suction filling of molding sand as described above can be performed without any problem if the mold surface of the model box has a simple shape. In some cases, the filling is not sufficiently performed, and the suction filling of the molding sand is employed only when the model surface of the model box has a simple shape. In addition, there is a problem that the communication between the model box and the air suction source which are sequentially sent is manually performed and the suction filling of the molding sand cannot be automated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and can fill molding sand to every corner and suction molding sand even if the mold cavity of the model box has a complicated shape. An object of the present invention is to provide a molding sand suction filling device capable of automating the filling.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a casting sand suction filling apparatus according to the present invention is provided with a sand hopper capable of ascending and descending upward, and a suction depressurizing mechanism below the sand hopper. A hollow roller conveyor for sequentially transferring the boxes is provided, and a vibration table is provided below the sand hopper so as to be able to move up and down from the upper surface of the roller of the hollow roller conveyor via an air spring. The vibration table is formed in an air chamber and the air chamber is connected to an air suction source. On the other hand, a communication port is provided at the upper part of the air chamber so as to be capable of communicating with the suction pressure reducing mechanism of the model box. It is characterized by being drilled.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. A plurality of model boxes 4 each having a mold cavity 1 formed therein and having a suction and pressure reducing mechanism 3 communicating with the mold cavity 1 and having openings 2 and 2 at the lower end surface thereof on the wall surface thereof. Intermittently moving center
A laconveyor 6 is provided. An opening / closing damper 7 for storing self-hardening sand S is provided above the hollow roller conveyor 6 at an appropriate position.
A sand hopper 8 is provided so as to be able to ascend and descend, and a vibration table 9 is provided below the roller conveyor 6 so as to be able to ascend and descend via air springs 10 and 10 below the sand hopper 8. Have been.

The upper surface of the vibrating table 9 projects upward from the upper surface of the roller 5 of the hollow roller conveyor 6 due to the extension action of the air springs 10 and 10, and the model box 4
Is raised from the roller conveyor 6, and is positioned below the upper surface of the roller 5 (the state shown in FIG. 1) by the contracting action. Further, the vibration table 9 has its interior formed in the air chamber 11 and the air chamber 1.
One end of 1 is connected to an air suction source and the atmosphere via a hose 12 and a switching valve (not shown). In the upper wall of the air chamber 11, the openings 2, 2 of the model box 4 are provided.
2 is a communication port which is press-fitted to 2 and communicates with the suction / decompression mechanism 3
3 are drilled. In the drawing, reference numeral 14 denotes a vibration motor.

[0007] In the apparatus constructed as described above, the model box 4 is moved directly below the sand hopper 8 via the hollow roller conveyor 6 and brought into the state shown in FIG. Next, compressed air is supplied to the air springs 10 and 10 to expand the air springs 10, thereby pushing up the vibration table 9 and slightly lifting the model box 4 from the roller 5. At this time, the communication port 13 of the vibration table 9 is in close contact with the openings 2 and 2 of the model box 4 and communicates with the suction pressure reducing mechanism 3. Next, the sand hopper 8 is lowered and the lower end thereof is pressed against the upper end opening of the mold cavity 1 of the model box 4 and then the switching chamber (not shown) is switched to switch the air valve 1 of the vibration table 9.
1 is connected to an air suction source via a hose 12, and the inside of the mold cavity 1 is suctioned and depressurized via a suction depressurizing mechanism 3, so that the depressurized state is maintained. In this state, the vibration motor 14 of the vibration table 9 is operated to vibrate the model box 4 via the vibration table 9, and then the opening / closing damper 7 is opened and the self-hardening sand in the sand hopper 8 is opened. S is suction-filled into the mold cavity-1. At this time, the self-hardening sand S is sufficiently filled to every corner in the mold cavity 1 to be sucked while being vibrated with the vibration of the model box 4 vibrated through the vibration table 9.

In the following, the operation opposite to the above operation is performed. That is, the opening / closing damper 7 is closed, the operation of the vibration motor 14 of the vibration table 9 is stopped, and the communication between the air suction source and the air chamber 11 is switched to the communication with the atmosphere. The compressed air of 10 is exhausted and contracted, the model box 4 is replaced on the roller 5 of the hollow roller conveyor 6 and transferred out of the machine by the roller conveyor 6, and the next empty model box 4 is transferred. Is carried directly below the sand hopper 8, and the above operation is repeated. The model box 4 filled with self-hardening sand S transferred outside the machine is divided after the self-hardening sand S is hardened, and divided into molds (cores).
Take out. If the molding sand is gas-curable sand,
The mold (core) is cured by aeration of the curing gas, and the model box 4
And a mold (core) is taken out.

[0009]

As is apparent from the above description, the present invention provides a sand hopper that can be lifted and lowered above the hollow roller conveyor and a vibration table below the hollow roller conveyor via an air spring. The vibration table is provided with an air chamber leading to an air suction source, and the air chamber is provided with a communication port capable of communicating with a suction pressure reducing mechanism of the model box. The molding sand can be suction-filled into the model box while giving vibration, and the molding sand can be filled to every corner even in a model box having a mold cavity having a complicated shape. . Further, the filling of the molding sand such as the communication between the model box and the air suction source can be automatically performed, and the manual operation by the operator can be eliminated, which is useful for the automation of the molding sand filling.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 suction pressure reducing mechanism 4 model box 5 roller 6 hollow roller conveyor 8 sand hopper 9 vibration table 10 air spring 11 air chamber 13 communication port

Claims (1)

(57) [Claims] 1. A hollow roller conveyor 6 for transferring a model box 4 provided with a suction pressure reducing mechanism 3 is provided below the sand hopper 8 so that the sand hopper 8 can be moved up and down. A vibration table 9 is disposed below the upper surface of the roller 5 of the hollow roller conveyor 6 via an air spring 10 so that the vibration table 9 can be moved up and down. -11 and the air chamber-
11 to an air suction source while the air chamber-1
1. A casting sand suction and filling device characterized in that a communication port 13 is formed in an upper portion of the model box 4 so as to be capable of communicating with the suction pressure reducing mechanism 3 of the model box 4 by pressure bonding.