JPS625810Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a so-called compressed gas supply device.

It is well known that when using a compressed gas supply tool, for example, in a casting process, when a hollow body made by mixing silica sand and sodium silicate is used as a mold, pressurized carbon dioxide gas is injected into the mold to harden the inner surface of the mold. It is being For this carbon dioxide injection, compressed carbon dioxide gas is injected into the inside of the mold through the gate part of the mold using a compressed gas supply device.

A conventional example of such a compressed gas supply device will be explained with reference to FIG.

In the conventional compressed gas supply device shown in FIG. 1, gas supply passages 2a and 2b penetrating the interior of a housing 1 are formed so that compressed gas can be supplied via a chamber 3. chamber 3
A valve body 4 forming a valve for opening and closing between the gas supply passage 2b and the chamber 3 and a valve rod 5 for driving the valve body 4 are provided inside. A through hole 6 passing through the outside of the housing 1 is provided in a part of the chamber 3, and a valve rod 5 is slidably inserted into the through hole 6. One end of the valve stem 5 is attached to the valve body 4 inside the chamber 3, and the other end projects outside the housing 1. A coil spring 7 surrounding the valve stem 5 inside the chamber 3 is connected to the valve body 4 by a drive mechanism (not shown). It is provided between the inner wall of the chamber 3 and urges the valve body 4 to a normally closed position. Further, a nozzle 8 is provided at the open end of the gas supply passage 2b, and the nozzle 8 is connected to the tip of the nozzle 8 in contact with an end surface provided with an opening to which compressed gas of a hollow object such as a mold is to be supplied. A hollow connector member 10 having a substantially truncated conical shape is provided to communicate with the opening. An annular seal member 11 made of, for example, sponge is provided on the end surface of the abutting connector member 10 that contacts the opening end surface. Gas supply passage 2
In order to supply compressed carbon dioxide gas into the interior of the housing 1, the valve stem 5 protruding from the housing 1 is pulled to the left in the figure. At this time, the valve stem 5 and the through hole 6
It is difficult to maintain airtightness between the chamber 3 and the carbon dioxide gas filling the chamber 3, which flows out to the outside of the housing 1 through the space between the through hole 6 and the valve stem 5 as shown by the arrow. There was a risk of carbon dioxide loss.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compressed gas supply tool that prevents leakage of compressed gas to the outside and supplies compressed gas only when necessary, thereby improving work efficiency.

The compressed gas supply device according to the present invention is configured such that the gas flow passage inside the housing is opened and closed by a solenoid valve, thereby preventing the compressed gas in the gas flow passage from leaking to the outside, and preventing the gas supply from leaking to the outside. In order to prevent loss of compressed gas, a switch means is provided for supplying a signal to drive a solenoid valve in response to contact of a connector member with a hollow mold.

Hereinafter, embodiments of the compressed gas supply device according to the present invention will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 shows a compressed gas supply device which is an embodiment of the present invention. Housing 1 approximately in the shape of a short gun
Compressed gas supply passages 2a and 2b passing through the interior of the supply passage 2a and 2b are connected via a chamber 3.
and the valve body 4 and the valve seat 4a at the connection position of the chamber 3.
is provided to form an on-off valve. Further, the chamber 3 communicates with an electromagnetic coil housing 13 via a seal ring 12. An electromagnetic coil 14 is provided within the electromagnetic coil housing 13, and a valve rod 5 to be driven by electromagnetic force is provided within the electromagnetic coil 14. The valve stem 5 is also connected to the valve body 4 within the chamber 3. The electromagnetic coil housing 13 has a substantially rounded shape, and the electromagnetic coil 14
It is attached to a part of the body with bolts 15.
The valve stem 5 is always urged to a predetermined position by a coil spring 16. As is clear from the above, the chamber 3 is completely isolated from the outside.

On the other hand, a partially open recess 17 is provided in the handle portion of the housing 1, and a mechanical switch 17a is held within the recess 17 by a switch mounting plate 17b that closes the open recess 17. The opening recess 17 is provided from the inside of the electromagnetic coil housing 13 in the longitudinal direction of the handle of the housing 1.
A through hole 17c is provided which reaches the lower end of the handle through the handle 7, and an electromagnetic coil 1 is installed inside the through hole 17c.
Two lead wires 17d for sending signals to the terminal 4 are inserted through the mechanical switch 17a to either one.
contacts (not shown) are inserted. Further, the lead wire 17d is connected to an external power source (not shown) via a cord 25. Further, a switch button 18, which is a part of the mechanical switch 17a, protrudes toward the abutment connector 10. Further, a trigger lever 19 is provided at a position where it can come into contact with the switch button 18, and is rotatably attached around a screw member 20 within a predetermined range. The trigger lever 19 has an abutment connector member 10.
One end of a longitudinal bar-shaped lever 21 extending in a direction perpendicular to the contact end surface of the longitudinal bar-shaped lever 21 is attached.
A support member 22 that slidably supports the housing 1 is attached to the housing 1. The other end of the longitudinal rod-like lever 21 is provided with a threaded portion and an adjustment screw 23 is attached thereto.

In the compressed gas supply device according to the present invention constructed as described above, as shown in FIG.
When compressed carbon dioxide gas is injected into the opening gate portion 25 of the mold 2, the abutment connector member 10
Adjust the adjustment screw 2 so that the adjustment screw 23 comes into contact with the end surface of the opening gate portion 25 of No.
Set 3. Therefore, the abutment connector member 10
When the adjustment screw 23 is firmly brought into close contact with the opening end surface, the adjustment screw 23 is pressed by the opening end surface, and at the same time, the trigger lever 19 presses the switch button 18, and a signal is sent to the electromagnetic coil 14 via the lead wire to close the electromagnetic valve 4. , 4a are opened. Further, since the sealing member 11 provided on the periphery of the abutting connector member 10 is elastic, it may be set so that the abutment surface of the adjustment screw 23 is on the same plane as the distal end surface of the sealing member 11. Furthermore, by using the sealing member 11, the end face of the mold and the connector member 10 are sealed.
It also prevents damage to the carbon dioxide gas and prevents leakage of carbon dioxide gas. In other applications, compressed air may be used instead of carbon dioxide gas, or the connector member 10 may be removed and the compressed gas may be sprayed manually.

Further, even when the compressed gas supplied to the mold is returned, the return of the compressed air or prevention of leakage is achieved without unnecessarily opening the electromagnetic valve.

As is clear from the above, the compressed gas supply device according to the present invention has good operability and can prevent compressed gas from leaking to the outside and returning to the supply side, resulting in high efficiency.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of a conventional compressed gas supply device.
Figure 2 is a sectional view of the compressed gas supply device of the present invention;
The figure is a partial cross-sectional view showing how the compressed gas supply tool shown in FIG. 2 is used. Explanation of symbols of main parts, 1...Housing, 2
... Gas supply passage, 3 ... Chamber, 4 ... Valve body, 4a ... Valve seat, 7, 16 ... Coil spring, 10 ... Connector member, 13 ... Electromagnetic coil housing, 14 ... Electromagnetic coil, 17a...Mechanical switch, 23...Adjustment screw.

Claims (1)

[Claims for Utility Model Registration] (1) A housing, a gas flow passage that penetrates the inside of the housing and communicates with a compressed gas supply source at one end, a nozzle that communicates with the other end of the gas flow passage, and a hollow mold. A compressed gas comprising: an abutment connector member that is brought into close contact with an opening end surface to communicate the nozzle with the opening of the hollow mold; an on-off valve that opens and closes the gas flow passage; and a drive means that drives the on-off valve. In the supply tool, the drive means includes an electromagnetic coil that drives the on-off valve by electromagnetic force, and an electromagnetic coil that is provided adjacent to the nozzle to bring the connector member into contact with the open end of the hollow mold. and switch means for supplying a signal to the electromagnetic coil. (2) Claim 1 of the utility model registration, characterized in that the switch means can also be driven manually.
Compressed gas supply device as described in section.