JPH0319659Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Use) The present invention relates to a valve device for opening a check valve of a flask used in full mold casting, vacuum mold casting, or the like.

(Prior art) For example, to perform casting using the full mold casting method, dry sand is put into a box-shaped casting flask, and compressed air is supplied from the bottom of the flask to make the dry sand suspended.
In this state, the vanishing model is set in dry sand, and after stopping the supply of compressed air, the pressure inside the flask is reduced to suck the dry sand into a solidified state under reduced pressure, and then pouring molten metal. In this type of full mold casting, as disclosed in Japanese Patent Publication No. 51-25402, piping for supplying compressed air into the flask and for suctioning and depressurizing the flask is constantly connected to the flask. It is common to use equipment.

However, in the above-mentioned known apparatus, the flask and piping are always connected, which makes handling the flask extremely troublesome, and when a large number of flasks are used, the piping equipment becomes extremely complicated. There was a problem.

(Purpose of the invention) The present invention was made with the aim of solving the above-mentioned problems, and provides a valve device that can communicate with the flask regardless of the supply of compressed air and the suction depressurization action. It is something.

(Structure of the invention) The structure of the invention will be described in detail below based on illustrated examples. Reference numeral 1 denotes a flask for full mold casting that is movably placed on a roller conveyor (not shown).The flask 1 has a box-like overall shape with a concave cross section, and has an inner bottom plate that allows only air to pass through. Small pores 2 are bored vertically and vertically.

Furthermore, a ventilation opening 3 is provided in the outer plate of the flask 1, and a valve seat 4 is attached to the outer surface of the ventilation opening 3. Reference numeral 5 denotes a large diameter recess formed on the outer surface of the valve seat 4, and two valve ports 7, 7 are formed at the bottom of the recess 5, facing each other with a rim portion 6 of a predetermined width in between. has been done.

Reference numeral 8 denotes a circular valve body made of an elastic member such as rubber or synthetic resin, and a thin wall portion facing the rim portion 6 is formed in the center of the valve body 8 by recessing the back surface in the shape of a groove. This thin wall portion is fixed to the rim portion 6 with a screw 9 via a washer and a collar. The valve body 8 has an outer diameter slightly smaller than that of the recess 5, and its inner surface is molded so that it can come into close contact with the bottom of the recess 5, and magnetic bodies 10, such as iron plates, are formed on the parts other than the thin wall part on the back surface. It is baked and pasted to form a check valve as a whole. 1
Reference numeral 1 denotes a fixed stand 1 arranged so as to face one side of the flask 1 along a roller conveyor (not shown).
The crimp head 1 is an air cylinder fixed to the crimping head 2, and the piston rod 13 has a horizontal recess 15 with a U-shaped cross section at the tip of the piston rod 13 via a mounting plate 14.
6 is installed. An electromagnet 17 is buried in the bottom of the crimping head 16, and a check valve magnetic head 18 having a U-shaped cross section is located in the electromagnet 17, with both ends facing the magnetic bodies 10, 10. In this way, it is located within the horizontal recess 15 and fixed horizontally.

Furthermore, a horizontal recess 1 is formed on the side wall of the crimp head 16.
A ventilation hole 19 penetrating the inside and outside of 5 is bored, and the ventilation hole 19 is connected to a rubber hose 20 and a switching valve 21.
It is switchably connected to a compressed air supply source 22 and a pressure reducing device 23 via.

In the figure, 24 is a sealing body, and 25 is dry sand.

(Operation of the invention) The operation of this embodiment configured as described above will be explained. The flask 1 charged with dry sand 25 is moved by a roller conveyor (not shown) to a position where the valve device is on standby, and is stopped in the state shown in FIG. 1. Next, the air cylinder 11 is operated to press the seal body 24 of the crimping head 16 against the outer surface of the valve seat 4, and the electromagnet 17 is energized. As a result, the magnetic bodies 10, 10 are attached to the magnetic head 1.
Under the magnetic force of the valve element 8, the valve body 8 operates in the direction of opening the valve ports 7, 7 as shown in FIG. 2, and is magnetically fixed to the tip of the suction head 18, resulting in the state shown in FIG.

In this state, switch the switching valve 21 and press the crimping head 1.
6 and a compressed air supply source 22 are communicated with each other. As a result, compressed air is blown out through the vent hole 19, the valve port 7, and the pore 2, causing the dry sand 25 to become suspended. In this state, the disappearing model (not shown) is set in dry sand, and the supply of compressed air is stopped.

Next, the switching valve 21 is switched to connect the pressure bonding head 16 and the pressure reducing device 23, and the top surface of the dry sand 25 is covered with a synthetic resin film. As a result, the dry sand 25 is subjected to a depressurizing action, and external pressure is applied through the film to solidify the dry sand 25 and firmly hold the disappearing model.

Next, the molten metal is poured into the sprue of the disappearing model to perform full mold casting, and this state is maintained until the molten metal solidifies.

Next, the electromagnet 17 is de-energized and the cylinder 11 is operated in reverse to return the crimp head 16 and valve body 8 to the state shown in FIG. Next, the cast flask 1 is removed, another unfilled flask 1 is moved to the standby position of the valve device, and the above operation is repeated.

In the above embodiment, an example was shown in which the present invention is applied to a flask for full mold casting, but it can also be applied to a flask for vacuum mold casting (V process).

(Effects of the invention) As described above, the present invention is constructed so that the valve body of the check valve can be opened by an electromagnetic magnet to supply compressed air and reduce pressure, so it is necessary to keep the flask and piping in communication at all times. This eliminates the need for casting flasks, making it easier to handle the flask and greatly simplifying the piping equipment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view, and FIG. 2 is an enlarged sectional view of the main parts showing the operating state. 15... Horizontal recess, 16... Crimping head, 17...
...Electromagnetic magnet, 18...Check valve magnetic head, 19...Vent hole, 21...Switching valve, 22...
Compressed air supply source, 23...pressure reducing device.

Claims (1)

[Scope of utility model registration request] A crimping head 16 having a horizontal recess 15 having a U-shaped cross section is provided so as to be movable back and forth, and an electromagnetic magnet 17 is embedded in the bottom of the lateral recess 15 of the crimping head 16. A check valve magnetic head 18 is attached to the electromagnetic magnet 17. It is located in the horizontal recess 15 and fixed horizontally, and the horizontal recess 1 is formed on the side wall of the crimp head 16.
A ventilation hole 19 penetrating the inside and outside of 5 is provided, and the ventilation hole 1
9 is continuously passed through a compressed air supply source 22 and a pressure reducing device 23 via a switching valve 21 in a switchable manner.