JPH0110136Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a blow head that forms a mold by blowing gas-curing or self-hardening wet sand into a mold.

Conventionally, as shown in FIG. 1, there has been a blow cylinder 4 consisting of an outer cylinder 2 having an enlarged wall part 1 at the lower part, an inner cylinder 3 having a large number of small holes punched therein, and an enlarged wall part of the outer cylinder 2. 1
The plurality of blow nozzles 5,...,
The wet sand supplied from the kneader 8 is blown by air ejected from a large number of small holes in the inner cylinder 3, and the blow head 7 is made up of a blow plate 6 to which blow nozzles 5,..., are attached. 5
A mold is known in which a mold is formed by injecting water into the mold 9.

Incidentally, the enlarged wall portion 1 of the blow tube 4 is provided to ensure a larger blow area than the cross-sectional area of the inner tube 3 and form a plurality of molds at the same time. The area surrounded by the blow plate 1 and the blow plate 6 becomes a pool of wet sand to be blown, and since wet sand originally has poor fluidity, it gradually accumulates in a bank shape as shown in the figure, deteriorating the filling property and causing the casting mold to deteriorate. In fact, the blow plate 6 often has to be removed to remove wet sand on the blow plate 6.

The present invention has been made in view of the above-mentioned problem of the blow head for wet sand equipped with a plurality of blow nozzles, and it is an object of the present invention to provide a blow head structure for wet sand that can prevent the accumulation of wet sand on the enlarged wall portion. It is something to do.

For this reason, the present invention includes an enlarged wall at the lower part of the outer cylinder of the blow cylinder, and closes the lower opening of the enlarged wall with a blow plate provided with a plurality of blow nozzles to close the large number of small holes in the blow cylinder. In an apparatus for blowing wet sand using an air flow from an inner cylinder, an air chamber is formed by providing a partition wall inside the enlarged wall of the outer cylinder of the blow cylinder at a distance from the wall surface. A blow head structure for wet sand is characterized in that a large number of small openings are formed and the air chamber is communicated with an air supply passage that supplies air at the same time as sand blowing, thereby supplying air to the air chamber during sand blowing. By ejecting the wet sand from a small opening, the wet sand that tends to be blown toward the partition wall is blown back, thereby preventing the accumulation of wet sand.

The embodiments shown in the drawings will be described below.

As shown in FIGS. 2 and 3, in this embodiment, a suitable material is placed on the inside of the enlarged wall 1 of the blow cylinder 4 consisting of an outer cylinder 2 and an inner cylinder 3. Partition walls 10 made of rectangular frames are provided at regular intervals, and a loop-shaped air chamber 11 with a closed cross section is defined by the partition walls 10, the inner wall surface of the enlarged wall portion 1, and the blow plate 6.

The partition wall 10 has a large number of small openings 12,...,1
2 is punched out in advance, while air chamber 1 is punched out in advance.
1 is provided with a bypass passage 15 as an air supply passage that communicates with the communication port 13 opened in the body of the outer cylinder 2 and the communication port 14 opened on the upper surface of the enlarged wall 1. A part of the air is guided into the air chamber 11 through the small opening 1 of the partition wall 10.
Air is ejected inward from ports 2, . . . , 12 all at once.

Therefore, during sand blowing, the wet sand that is about to be blown toward the enlarged wall 1 of the blow tube 4 reaches the vicinity of the partition wall 10 and is absorbed by the air blown out from the large number of small openings 12, . . . , 12 of the partition wall 10. As a result, the wet sand is blown back to prevent the accumulation of wet sand on the enlarged wall portion 1, and the wet sand is given fluidity by being blown back.
Good blowing is performed from each blow nozzle 4, . . . , 4.

In the above embodiment, air is guided to the air chamber 11 by the bypass passage 15, but the inner cylinder 3 is extended to have a similar shape to the overall shape of the outer cylinder 2 and the enlarged wall 1. The space between the outer cylinders 3 and 2 and the air chamber 11 may be directly communicated with each other, and a portion of the blow air may be guided to the air chamber 11.

As is clear from the above description, according to the present invention, it is possible to reliably prevent the accumulation of wet sand on the inside of the enlarged wall portion, stabilize the filling property, and improve the yield of blow sand. This greatly reduces the frequency of cleaning the blow plate.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view of one half of a blow head for wet sand, Fig. 2 is an explanatory cross-sectional view almost similar to Fig. 1 showing an embodiment of the present invention, and Fig. 3 is a cross-sectional view in the - line direction of Fig. 2. It is. DESCRIPTION OF SYMBOLS 1... Enlarged wall part, 4... Blow tube, 5... Blow nozzle, 6... Blow plate, 7... Blow head, 10... Partition wall, 11... Air chamber, 12... Small opening, 15... bypass passage.

Claims (1)

[Claim for Utility Model Registration] The outer cylinder of the blow cylinder is provided with an enlarged wall at the lower part, and the lower opening of the enlarged wall is closed with a blow plate provided with a plurality of blow nozzles, and a large number of small holes in the blow cylinder are closed. In a device that blows wet sand using an air flow from an inner cylinder equipped with A blow head structure for wet sand, characterized in that a large number of small openings are formed, and an air supply passage for supplying air simultaneously with sand blowing is communicated with the air chamber.