JPH0428679Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mold making device for making shell molds and the like.

(Traditional technology) From the past, the molding device that molds molds such as Ciel molds is known for a blow -molding device equipped with a blow -units that supplies the casting sand such as Ciel sand. (For example, Utsukai 54-
(Refer to Publication No. 152120). In the blow unit, a blow head is detachably attached to the lower surface of a blow tank that moves up and down. During blowing, the blow head is pressed against the mold, and the sand fed inside is filled into the cavity in the mold through the blow port.

Since the blow head for mold making has a blow port arrangement structure corresponding to the sand inlet of the mold, when the mold is replaced, the blow head is also replaced together with the mold.

(Problem to be solved by the invention) However, when replacing the blowhead with the mold, if the blowhead and blow tank are separated, the upper surface of the blowhead will be opened and the residual sand contained in the blowhead will be released. There are problems such as spillage from the periphery and staining the area around the mold making equipment.

However, if the depth of the blow head is increased so that the peripheral edge is higher than the remaining sand contained therein, it is possible to prevent the sand from spilling out, but this has the disadvantage of increasing the height of the blow unit. The height of the periphery of the blowhead and the height of the remaining sand are close to each other, and vibrations caused when the blowhead is separated from the blow tank or transported together with the mold cause the sand to crumble and spill.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a mold making apparatus that prevents sand from spilling when the blow head is separated from the blow tank.

(Means for Solving the Problems) The mold making device of the present invention is provided with a pressing plate having a protrusion that forms a concave portion in the stored residual sand corresponding to the inner circumference of the blow head, and a The present invention is characterized by the provision of a drive mechanism that drives the pressing plate downward before the blow tank and blow head are separated.

(Function) In the above-mentioned molding device, when the blowhead is separated from the blow tank due to mold exchange, etc., the drive mechanism presses the pressing plate against the peripheral part of the residual sand in the blowhead before separation. A recess is formed by the recess to prevent sand from spilling out.

(Example) Hereinafter, an example of the present invention will be described along with the drawings. FIG. 1 is a sectional view of a main part of a blow unit of a mold making apparatus in a first embodiment.

The blow head 1 is removably attached to the lower surface of the blow tank 2, and is pressed into a mold (not shown) to transfer sand S supplied from the blow tank 2 to a cavity in the mold, which is opened at a predetermined position on the upper surface of the mold. It is filled and supplied from the inlet.

The blow head 1 is formed in the shape of a tray with an open upper surface, and has a flange portion 1a for connection with a blow tank 2 on the outer periphery of the upper portion. In addition, the bottom plate 1b
A blow port 3 for supplying sand S is disposed at a position corresponding to a sand inlet opening on the upper surface of the mold. This blow port 3 is formed by fitting a sleeve 4 into an opening formed in the bottom plate 1b, the lower end of this sleeve 4 slightly protrudes from the lower surface of the bottom plate 1b, and a gasket 5 on the outer periphery of the protrusion is higher than the amount of protrusion.
is installed. Further, above the opening of the blow port 3, a baffle plate 6 is disposed by a pin 6a at a predetermined distance from the upper surface of the bottom plate 1b. This baffle plate 6 is attached to the blow port 3 except when blowing.
The sand S is prevented from flowing out from the blow port 3 by keeping the angle of the sand S smaller than the angle of repose.

On the other hand, the blow tank 2 connected to the upper surface of the blow head 1 has a flange part 2a on the lower outer periphery that connects with the flange part 1a on the upper outer periphery of the blow head 1, and a sand supply tube 7 is provided in the center of the upper part. , sand S is supplied from above, and the lower opening 7a of this sand supply cylinder 7 is opened and closed by a sand opening/closing valve 8. In addition, on the outer periphery of the sand supply cylinder 7,
Blow air pipes 9 are arranged concentrically, and pressurized air is supplied during blowing.

Furthermore, a press plate 11 is fitted into the inner surface of the lower part of the blow tank 2 so as to be slidable up and down. This pressing plate 11 has an outer circumferential portion in contact with the inner circumferential wall of the blow tank 2 and an inner circumferential portion in contact with the outer circumferential surface of the blow air pipe 9 via sealing materials 12 and 13, respectively, and is driven by a drive mechanism 14 disposed above. It is operated by sliding. In the drive mechanism 14, the tip end of a rod 15a of a telescoping cylinder 15 fixed to the upper wall of the blow tank 2 is connected to the back surface of the press plate 11, and is slid up and down by the telescoping action of the rod 15a.

A protrusion 11a that protrudes downward is formed on the peripheral edge of the press plate 11, and the protrusion 11a protrudes downward from the lower end of the blow tank 2 when the press plate 11 is lowered. A recess A is formed in the peripheral edge of the residual sand S corresponding to the inner peripheral part. The above pressing plate 11
When moving upward by the drive mechanism 14, the lower end protrusion 11a is recessed above the lower end flange surface of the blow tank 2, so that it does not interfere with the blow head 1 when the blow tank 2 and the blow head 1 are connected. .

The blow tank 2 is supported so as to be slidable in the vertical direction by a support mechanism (not shown), and is provided so that it can be moved up and down by a moving means to press the blow head 1 against the mold.

Next, to explain the operation, when the blow head 1 is attached to the lower part of the blow tank 2 and normal blow filling is performed, the blow tank 2 is lowered to press the lower gasket 5 of the blow head 1 to the mold, and the blow Pressurized air is introduced from the air pipe 9, and the molding sand S fed from the sand supply tube 7 is filled into the mold together with the blow air from the blow port 3.

On the other hand, when separating the blow head 1 from the blow tank 2 due to mold replacement or the like, before separation, the telescopic cylinder 15 of the drive mechanism 14 is extended and the pressing plate 11 is moved downward, and the tip protrusion 11
a to push the peripheral edge of the sand S remaining in the blow head 1 to form a recess A. Thereafter, the blow head 1 is separated from the blow tank 2, and the blow head 1 is carried out together with the mold. that time,
Even if the mountain-shaped residual sand S is slightly collapsed due to vibrations during separation or transport, it flows into the recess A on the outer periphery and is prevented from spilling outside.

FIG. 2 shows the main parts of a mold making apparatus according to a second embodiment, and this embodiment is applied to an example in which the blow head is provided with an eject mechanism for removing the mold after molding from the mold.

The blow head 1, which is removably attached to the lower part of the blow tank 2, has an eject pin 19 disposed above the blow port 18 opened in the bottom plate 1b so as to be movable up and down through the blow port 18. There is. That is, the blow port 18 is constituted by a cylindrical member 20 provided upright on the bottom plate 1b, and the blow port 18 is opened at the center of the lower part of the cylindrical member 20, and the blow port 18 is filled with sand when not blowing. The sand S is fed through a communicating path 20a formed in a structure that prevents sand from flowing out. An eject pin 19 is fitted into the cylindrical member 20 above the communication passage 20a, and the upper end of the eject pin 19 extends further upward from the cylindrical member 20. Therefore, it is biased upward.

On the other hand, a press plate 22 is fitted into the blow tank 2 so as to be able to slide vertically.
2 has an outer circumferential portion in contact with the inner circumferential wall of the blow tank 2 and an inner circumferential portion in contact with the outer circumferential surface of the blow air pipe 9 via sealing materials 12 and 13, respectively, and as described above,
It is slidably operated by a drive mechanism 14 using a telescopic cylinder 15 disposed above. A protrusion 22 is provided on the peripheral edge of the pressing plate 22 and protrudes downward.
This protrusion 22a projects downward from the lower end of the blow tank 2 when the pressing plate 22 is lowered, and forms a recess A at the periphery of the residual sand S corresponding to the inner periphery of the blow head 1. It is something to do. Further, the press plate 22 can come into contact with the upper end of the eject pin 19, and when the press plate 22 is lowered, the eject pin 19 protrudes from the blow port 18 and comes into contact with the mold in the mold to perform an ejecting action. It is.

The rest of the structure is the same as that of the previous example, and the same structures are denoted by the same reference numerals.

In the above embodiment, the recess A is formed at the periphery of the residual sand S by the operation of the pressing plate 22 by the drive mechanism 14, and it also has an eject function, so that the ejecting operation is performed or the mold is replaced, etc. As a preliminary step, a depression A is formed in the residual sand S by the downward movement of the pressing plate 22 to prevent sand from spilling out.

(Effects of the invention) According to the invention as described above, when the blowhead is separated from the blow tank when replacing the mold, etc., the protruding part of the pressing plate prevents the residual sand in the peripheral edge of the blowhead from being removed. By forming the concave portion, it is possible to prevent sand from spilling out when the blow head is removed, and the handling workability is excellent and the efficiency of mold replacement work is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a mold making apparatus according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a mold making apparatus according to a second embodiment of the present invention. 1...Blow head, 2...Blow tank, 1
a, 2a...flange part, 7...sand supply cylinder, 9...
... Blow air pipe, 11, 22 ... Pressing plate, 11a, 22a ... Protrusion, 14 ... Drive mechanism, 15 ... Telescopic cylinder, A ... Recess, S ...
sand.

Claims (1)

[Scope of utility model registration request] A blow head is removably attached to the lower part of the blow tank, and a press plate is provided in the blow tank that is movable up and down and has a protrusion that forms a recess in the stored residual sand corresponding to the inner circumference of the blow head. A mold making apparatus characterized in that a drive mechanism is provided for driving the pressing plate downward before separating the blow tank and the blow head.