JP2526650Y2 - Gas pressure switching device for gas pressure equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas pressure device provided between a pressurized container and a high-pressure gas container attached to a gas pressure device such as a gas pressure die casting machine. The present invention relates to a gas pressure switching device of a gas pressure device for connecting and disconnecting the supply of gas.

[0002]

2. Description of the Related Art For example, a gas pressure die casting machine known as a gas pressure device using a high pressure gas for pressurizing a fluid is generally constituted as follows. That is, the lower fixed platen fixed on the machine base and the upper fixed platen above it are connected at four corners by tie rods, and the tie rods support the movable platen so as to be movable up and down. The lower fixed platen and the movable platen
The fixed mold and the movable mold are mounted respectively, and the movable platen moves up and down by the die height adjustment device provided on the movable platen to open and close the mold corresponding to the size of the mold, and further provided on the movable platen The movable mold is clamped with respect to the fixed mold by the clamp cylinder provided.

On the other hand, a pressurized container that opens upward is fixed to the lower surface of the fixed mold by pressing an open flange to maintain an airtight state. A molten metal container is accommodated in which a sleeve is communicated with a cavity formed at the joint between the two molds. The molten metal supplied by the pouring device is stored in the molten metal container in a state where the molten metal is heated by the heater, and the pressurized container is provided with a gas tank provided with a solenoid valve. It is connected via a pipe, and is configured such that, for example, N ₂ gas in a gas tank is supplied to a pressurized container by opening a solenoid valve.

[0004] With this configuration, after the movable mold is clamped to the fixed mold and the molten metal is put into the molten metal container in the pressurized container, and the solenoid valve is opened, the gas in the gas tank is opened. High-pressure gas is supplied into the pressurized container via the gas supply pipe, and the surface of the molten metal placed in the molten container in the pressurized container is pressurized. This molten metal is injected into the mold cavity through the sleeve. Is done. The injected molten metal solidifies into a product, so open the mold and extrude this product from the cavity.
By taking it out of the machine, one casting cycle is completed.

[0005]

However, in such a conventional gas pressure die casting machine, when the solenoid valve connected to the pressurized container is a pilot operated valve, it takes a time from when an electric signal is issued to when the valve is opened. The response delay due to the flow of the pilot system overlaps with the response delay of (1), and not only the rise time and fall time of the pressure are delayed, but also a separate pressure source is required and the cost is increased.

The present invention has been made in view of the above points, and an object of the present invention is to provide a gas pressure switching device of a gas pressure device which has excellent responsiveness and enables ultra-high-speed switching.

[0007]

In order to achieve the above object, according to the present invention, a valve body which opens and closes a valve seat between a gas container side and a pressurized container side by axially moving back and forth is provided at one end. An arm, one end of which is substantially orthogonal to the valve shaft and is pivotally supported at one end to the valve housing side, and which is engaged with the swing end of the arm by an engagement surface, and A lever pivotally supported on the valve housing side in a direction substantially orthogonal to the valve housing, and by pressing a swinging end of the lever to change the engagement position of the engagement surface, the valve seat is moved through the arm and the valve shaft. The gas pressure switching device of the gas pressure container is constituted by the actuator for opening the gas pressure container.

[0008]

When the actuator pushes the swing end of the lever to swing the lever, the engagement position of the engagement surface between the lever and the arm changes, and the arm swings by the action of the engagement surface. As the valve shaft integrated with moves in the axial direction, the valve seat opens and the high-pressure gas in the gas container is sent to the pressurized container,
Gas pressure equipment operates.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment shows an example in which the present invention is applied to a gas pressure die casting machine. FIG. 1 is a front view of a gas pressure switching device.
FIG. 2 is a plan view of the same, and FIG. 3 is a sectional view taken along the line III-III of FIG. Since the configuration of the gas pressure die casting machine has been described in the section of the prior art, the description thereof will be omitted. In the figure, a casing 2 of the valve device, which is generally designated by reference numeral 1, is formed in a substantially square rectangular shape in plan view.
The pressurized container of the gas pressure die casting machine is connected via the pressurized chamber 3. In addition, for example, high-pressure N ₂
A gas container storing gas is connected via a source pressure chamber 4, and a gas passage 2 a communicating with the pressure chamber 3 is provided in the housing 2.
And a gas passage 2 b communicating with the source pressure chamber 4. The block 5 fixed on the housing 2 is provided with a gas passage 5a communicating with the gas passage 2a and a gas passage 5b communicating with the gas passage 2b. Reference numeral 6 denotes a plug screwed into the thread of the gas passage 5b. Further, the valve body 7 fixed on the block 5 is provided with a gas passage 7a communicating with the gas passage 5a and a gas passage 7b communicating with the gas passage 5b. These gas passages 7a, 7b
Is communicated with a gas passage 7c. Reference numeral 8 denotes a ground metal screwed into the upper end screw hole of the valve body 7.

A valve shaft 9 is fitted in an inner hole 7d of the valve body 7 and an inner hole 8a of the ground metal 8 so as to be able to move forward and backward. A valve body 10 for opening and closing a valve seat 7e at the upper end of the gas passage 7b is mounted. On the other hand, a bracket 11
At the upper end thereof, one end of a horizontal arm 12 fixed to the upper end thereof substantially orthogonal to the valve shaft 9 is pivotably supported via a pin 13. I have. A bracket 14 is fixed to the other end of the upper surface of the housing 2, and a lever 15 that is substantially orthogonal to the arm 12 is pivotally supported on the bracket 14 via a pin 16 so as to be swingable. A hole 15a provided at the center of the lever 15
, The tip of the arm 12 is engaged. And
An inclined surface 12a as an engagement surface is formed at the tip end of the arm 12 engaged with the hole 15a.
On a, an engagement surface 15b that engages with the inclined surface 12a is formed. Reference numeral 17 denotes a stopper fixed to the upper surface of the block 5 and standing upright.
And is configured to regulate the upward swing limit of the arm 12. Further, a plastic hammer 18 as an actuator is provided in the vicinity of the upper end of the lever 15 so as to be swingable.
The arm 12 slightly swings due to a change in the engagement position between the arm 12 and the engagement surface 15b.

The operation of the gas pressure switching device configured as described above will be described. Prior to the casting operation by the gas pressure die casting machine, the valve body 10 closes the valve seat 7a as shown in the figure, and N ₂ gas in the gas container (not shown) passes through the original pressure chamber 4 and the gas passages 2b, 5b, 7b. This pushes the valve body 10 upward. In this state, the movable mold is clamped to the fixed mold, and the molten metal is poured into the molten metal container in the pressurized container. Then, when the swinging end of the lever 15 is pushed by the plastic hammer 18, the lever 15 swings and the engagement position between the inclined surface 12a and the engaging surface 15a changes.
The arm 12 slightly swings in the direction in which the swing end rises together with the valve shaft 9 that rises due to the gas pressure acting on the valve body 10 by the action of a, and the swing is regulated by the stopper 17 and stopped. I do. When the valve body 10 is lifted together with the valve shaft 9 and the valve seat is opened, the N ₂ gas pushing the valve body 10 as described above passes through the gas passages 7c, 7a, 5a, 2a and the pressure chamber 3 to the die casting machine. Since the molten metal is sent to the pressure vessel, the surface of the molten metal placed in the molten metal vessel in the pressure vessel is pressurized, and the molten metal is injected into the mold cavity through the sleeve. When the injection is completed, the tilted lever 15 becomes vertical, and the tip of the arm 12 is pushed down by the engagement surface 15b of the lever 15 by the action of the inclined surface 12a. Is opened. Thereafter, since the molten metal injected into the mold cavity is solidified into a product, the mold is opened, the product is extruded from the cavity, and taken out of the machine to complete one casting cycle.

In the gas pressure switching device that operates as described above, all the operations from the pressing of the lever 15 by the plastic hammer 18 to the rising of the valve shaft 9 are performed mechanically, so that the response delay is reduced as compared with the prior art. The pressure rises and falls faster.

In this embodiment, the inclined surface 12a
Is provided on the arm 12 side, but an inclined surface may be provided on the lever 15 side, and the engaging surface of the arm 12 may be engaged with the inclined surface. The actuator for pushing the swinging end of the lever 15 is not limited to the plastic hammer as in the present embodiment, but may be any member as long as it pushes the swinging end of the lever 15. Further, in this embodiment, the example in which the arm 12 is urged in the valve opening direction only by the gas pressure is shown, but even if the urging force is increased by interposing a spring member between the arm 12 and the ground metal 8. Good. Further, the present embodiment shows an example in which the present invention is applied to a gas pressure die casting machine. However, the present invention is not limited to this, and may be applied to any gas pressure equipment.

[0014]

As is apparent from the above description, according to the present invention, in a gas pressure switching device of a gas pressure device, one end of the gas pressure switching device is substantially orthogonal to a valve shaft having one end thereof and is swung toward a valve housing. An arm rotatably pivotally supported, and a lever which is engaged with a swinging end of the arm by an engagement surface and is pivotally pivotally supported on the valve housing side substantially orthogonal to the arm; By pressing the swinging end of the lever, the engagement position of the engagement surface is changed to open the valve seat via the arm and the valve shaft, so that the pressure from the lever can be raised to the valve shaft rise. All operations up to this point are performed mechanically, and the response delay is shortened and the rise time and fall time of the pressure are shortened compared to the past, so that extremely high speed switching is possible and the performance of the equipment is improved At the same time, the operation rate of the equipment is improved. Further, the structure is simple, and the device can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a gas pressure switching device.

FIG. 2 is a plan view of the gas pressure switching device.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 valve device 3 pressurizing chamber 4 source pressure chamber 7e valve seat 9 valve shaft 10 valve body 11 bracket 12 arm 12a inclined surface 13 pin 15 lever 15b engaging surface 16 pin 18 plastic hammer

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve shaft having at one end a valve body for opening and closing a valve seat between a gas container side and a pressurized container side by advancing and retreating in the axial direction, and one end substantially perpendicular to the valve shaft. Arm pivotally supported on the valve housing side, and is engaged with the swinging end of the arm by an engagement surface, and is pivotally supported on the valve housing side substantially orthogonally to the arm. A gas pressure, comprising: a lever; and an actuator that presses a swinging end of the lever to change an engagement position of the engagement surface to open the valve seat via the arm and the valve shaft. Gas pressure switching device for equipment.