JPH065003Y2 - Compressed air blowing device in green molding equipment - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is a raw mold in which compressed air is blown into the surface of the molding sand in the molding frame, the compressed air flows through the molding sand and is discharged from the model plate. The present invention relates to an apparatus suitable for blowing a large amount of compressed air onto the surface of the molding sand at once in the green molding equipment for molding.

(Prior Art) The applicant of the present invention has previously described, as one of green molding equipment,
We have developed and provided the one as disclosed in Japanese Patent No. 80247. In this green molding equipment, a cover member and a compressed air storage tank having an exhaust hole in a bottom plate are arranged above a table for raising and lowering a model plate and a casting frame, and the exhaust hole is expanded and contracted by a pneumatic cylinder. After the casting sand is put into the flask on the model plate, the upper end opening of the flask is closed by the cover member and the tank is superposed on the cover member. Then, the pneumatic cylinder is operated to open the exhaust hole on the bottom plate of the tank, and the compressed air in the tank is blown into the flask through the cover member, and the compressed sand is compressed with the compressed air. The mold is made to flow through and discharged from the model plate, whereby the molding sand is compression-hardened to form a green mold.

(Problems to be solved by the invention) By the way, in the green molding equipment configured as described above,
A large amount of compressed air needs to be blown into the molding sand in the flask all at once, but since the pneumatic cylinder is connected to the compressed air source through piping and a switching valve, it remains when the pneumatic cylinder operates. Due to the resistance of the compressed air, the operation of the pneumatic cylinder was delayed, and the exhaust hole could not be opened at high speed to blow in a large amount of compressed air all at once. Along with this, there have been problems such as poor molding performance of green molding equipment.

The present invention has been made to solve the above problems.

(Means for Solving the Problem) In order to achieve the above object, the compressed air blowing device of the green molding equipment in the present invention is capable of closing the upper end opening of the casting frame and has an exhaust hole provided through. A valve that opens and closes the exhaust hole and a downward cylinder that raises and lowers the valve are provided on the upper surface of a platen-shaped frame, and a compressed air storage tank is configured to surround the cylinder on the upper surface of the frame. A cover member is attached to the cylinder, an exhaust hole is provided in the rear lid of the cylinder, and the lower end of an exhaust cylinder that penetrates the ceiling portion of the cover member in the lid in an airtight manner is surrounded by the exhaust hole. It is characterized in that it is mounted in a circular shape and further provided with a valve for opening and closing the exhaust hole of the rear lid of the cylinder.

(Operation) In order to blow compressed air into the molding frame in which the molding sand is charged and the upper end opening is in contact with the lower surface of the frame, the compressed air is supplied into the cover member and then the exhaust hole of the rear lid of the cylinder. Open with a valve. Then, the compressed air is exhausted from the exhaust hole of the rear lid of the cylinder all at once, and along with this, the valve that closed the exhaust hole of the frame by supplying compressed air to the front lid side of the cylinder holds the piston of the cylinder at high speed. Then, the exhaust holes are momentarily opened, and the compressed air in the tank is blown into the casting frame at once.

(Example) An example will be described with reference to the drawings. A table (3) is provided at a central portion of a platen-shaped base (1) so as to be able to move up and down via an upwardly facing cylinder (2). Further, columns (4) and (4) are erected at four corners of the base (1), and a roller conveyor with a collar (5) extending in the left-right direction is installed at an intermediate position of the columns (4) and (4). And the stanchions (4) (4)
A platen-like frame (7) having exhaust holes (6) (6) near the center is installed on the upper end of the frame. On the upper surface of the frame (7), a cylindrical cylinder (8) which is vertically oriented and whose upper end is closed by a lid (8a) surrounds the upper ends of the exhausts (6) and (6). The cylinder (8) has air supply holes (10) and (10) in the lower part of the body corresponding to the front lid side. A piston (11) is vertically slidably fitted in the cylinder (8), and when the piston (11) descends near the air supply holes (10) and (10) on the lower surface of the piston (11). Valves (12) (1) for closing the exhaust holes (6) (6)
2) is a connecting punch (12a) corresponding to a piston rod
It is fixed via (12a). Further, a cover member (13) which constitutes a compressed air storage tank together with the frame (7) is airtightly mounted so as to surround the cylinder (8). A tubular exhaust pipe (14) is formed at the center of the ceiling of the cover member (13) and extends downward through the cover member and has a bottom plate (14a) at the lower end thereof. Reference numeral 14) denotes an exhaust hole (15) having a large diameter which penetrates a lid portion (8a) corresponding to a rear lid of the cylinder (8) in an airtight manner and has a bottom plate (14a).
Is equipped with. Further, the exhaust pipe (14) has an exhaust hole (16) in the upper portion, and a siren (17) is attached to the exhaust hole (16). Further exhaust stack (14)
A downward facing cylinder (18) is airtightly mounted on the upper end of the piston, and a piston (19) is vertically slidably fitted in the cylinder (18). The piston (19) is a compression coil spring. It has been raised by (20). Further, a piston rod (21) extending downward is attached to the lower surface of the piston (19), and the piston rod (21) is attached.
A valve (22) capable of closing the exhaust hole (15) of the exhaust stack (14) from below is attached to the lower end of the exhaust pipe (14). In addition, the inside of the upper part of the cylinder (8) is connected via the on-off valve (23),
Inside the cover member (13), via a pressure regulating valve (24),
The inside of the upper part of the cylinder (18) is a three-way port directional control valve (2
The compressed air sources (26) are connected to each other via 5), and the compressed air is constantly supplied into the cover member (13). In the figure, (27) is an air distribution plate attached to the lower surface of the frame (7), (28) is a frame body attached to the lower surface of the frame (7) so as to surround the air distribution plate (27), and (29). ) Is a model plate, (30) is a casting frame, and (31) is a filling frame.

Next, the operation of the apparatus configured as described above will be described. As shown in the drawing, the flask (30) on the model plate (29).
And casting sand (S) is put into the inside of the filling frame (31), these are carried in to the position just above the table (3) by the roller conveyor with a collar (5), and then the table is extended by the extension operation of the cylinder (2). (3) is pushed up to bring the fill frame (31) into contact with the frame body (28). Then, the three-way port directional control valve (25) is switched to supply compressed air into the upper portion of the cylinder (18), whereby the piston (1
9), the piston rod (21) and the valve (22) are lowered against the repulsive force of the coil spring (20) and the air pressure acting on the lower surface of the valve (22). Thus the valve (22)
At the moment when is separated from the lid portion (8a) of the cylinder (8), a large amount of compressed air in the upper portion of the cylinder (8) flows into the exhaust pipe (14) through these gaps, and the compressed air in the upper portion of the cylinder (8) is discharged. The pressure in the cover member (13) is reduced by the pressure in the cylinder (8).
Flows into the lower part of the cylinder (8) from the piston (1
1) is pushed up and the exhaust holes (6) and (6) are opened. In this case, the compressed air in the upper part of the cylinder (8)
After the valve (22) is separated from the lid (8a), a large amount of it immediately flows into the exhaust stack (14) and the pressure in the upper part of the cylinder (8) rapidly drops, so that the valves (12) and (12). Is raised at a high speed, and the exhaust holes (6) and (6) are instantaneously opened. The compressed air that has flowed into the exhaust stack (14) is throttled by the silencer (17) and is discharged through the exhaust hole (1
6), but the exhaust pipe (14) has a certain volume, so a relatively large amount of compressed air flows into the exhaust pipe (14) from the upper part of the cylinder (8). And therefore the piston (11) and the valve (1
2) (12) will rise at high speed. Thus
When the exhaust holes (6) and (6) are momentarily opened, a large amount of compressed air in the cover member (13) is exhausted from the exhaust holes (6) and (6) all at once, and the air distribution plate (27) is discharged. After being dispersed in, the molding sand (S) is compressed and the molding sand (S) is also compressed.
It flows through the inside and is discharged from the vent hole of the model plate (29), whereby the molding sand (S) is compression hardened.
After the hardening of the foundry sand (S) is completed, the three-way opening direction switching valve (25)
The compressed air in the upper part of the cylinder (18) is discharged by switching the valve (22) through the piston (19) by the repulsive force of the compression coil spring (20), and the exhaust hole (1
5) is closed, and subsequently the on-off valve (23) is opened to supply compressed air into the upper part of the cylinder (8), and the valve (12) (1)
2) is lowered to close the exhaust holes (6) and (6). Then, the contraction operation of the cylinder (2) lowers the table (3) and the like to place the molding frame (30) with a built-in raw mold on the roller conveyor (5) with a collar and die-cutting. The frame (30) and the like are carried out from the table (3) via the roller conveyor with a collar (5), and one cycle is completed.

In the above embodiment, the valve (22) closes the exhaust hole (15) from the lower side of the lid (8a).
Even if it is closed from the upper side, the same effect can be obtained. Further, the valve (22) may be moved up and down by other conventional means such as an electric cylinder. Exhaust stack (1
The exhaust hole (15) of 4) is the lid part (8a) of the cylinder (8).
The structure may be formed directly on the substrate.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the valve for opening and closing the exhaust hole of the frame is moved up and down by the downward pneumatic cylinder, and the exhaust hole and the exhaust are provided on the rear lid of the pneumatic cylinder. Since the valve that opens and closes the hole is provided, when the valve is raised to open the exhaust hole of the frame, a large amount of compressed air is quickly discharged from the exhaust side of the pneumatic cylinder and the resistance due to the residual compressed air disappears. The exhaust hole is opened momentarily, and a large amount of compressed air in the cover member can be blown into the casting frame at a stretch, which is an excellent practical effect.

[Brief description of drawings]

 The drawing is a partial sectional front view showing an embodiment of the present invention. (6): Exhaust hole (7): Frame (8): Cylinder (10): Air supply hole (11): Piston (12): Valve (13): Cover member (14): Exhaust pipe (15): Exhaust hole (22): Valve (23): Open / close valve (24): Pressure regulating valve

Claims (1)

[Scope of utility model registration request] Claims: 1. After casting molding sand into a molding frame placed on a model plate with a vent hole, compressed air is blown onto the surface of the molding sand to flow through the molding sand toward the model plate to produce a green mold. Is a device for blowing compressed air in a green molding facility that is configured to mold, and is capable of closing the upper end opening of the casting mold and has an exhaust hole transparently provided on the upper surface facing the upper end opening of the casting mold. A disk-shaped frame; a cylindrical body which is attached to the upper surface of the frame in an airtight manner, is oriented vertically, and has an upper end closed by a lid, and an exhaust hole is formed in the lid and a lower part of the body A cylinder provided with air supply holes; a piston fitted in the cylinder so as to be slidable up and down; mounted on the lower surface of the piston, and when the piston descends near the air supply hole of the cylinder body, A valve for closing the exhaust hole of the frame; A cover member that is mounted on the cylinder in an airtight manner so as to surround the cylinder and forms a compressed air storage tank with the frame; and extends downward through the ceiling portion of the cover member in an airtight manner and extends downward. An exhaust tube, a portion of which is hermetically attached to a lid portion of the cylinder so as to surround the exhaust hole of the lid portion; and a valve which is arranged so as to be vertically movable and opens and closes the exhaust hole of the cylinder. A blower for compressed air in a green molding facility, wherein the inside of the cylinder is connected to the compressed air source via an on-off valve and the inside of the cover member to a compressed air source.