JPH0353791Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the structure of a molten metal replenishment port of a molten metal holding furnace in a low pressure casting apparatus.

(Prior Art) A low-pressure casting apparatus used for casting metals such as aluminum alloys includes a holding furnace in which molten metal is stored and a stalk is inserted.

This holding furnace is provided with a replenishment port for replenishing the molten metal container of the holding furnace with molten metal transported from the melting furnace when the molten metal in the holding furnace decreases due to product casting.

In low-pressure casting equipment, gas pressure must be applied to the surface of the molten metal in the molten metal container to force the molten metal through the stalk and into the mold located above. Therefore, if there is a molten metal replenishment port, when gas pressure is applied to the molten metal surface and the molten metal level in the molten metal container rises,
The molten metal rises above the supply port level, and as a result,
To prevent molten metal from overflowing from the replenishment port, the level of the replenishment port must be set higher than the highest position of the casting space of the mold, or when the molten metal surface in the molten metal container rises, the molten metal level may be lower than the replenishment port. For those with a structure that rises higher than the replenishment port, the replenishment port and the receptacle that is inserted when replenishing molten metal are made detachable, and the receptacle surface of the opening/closing lid is not obstructed by inclusions, so that the opening/closing lid is tightly attached to the replenishing port. It is necessary to prevent the air and molten metal in the supply pipe leading to the molten metal container from leaking from the supply port.

(Problem that the invention aims to solve) However, if the upper end of the replenishment port is set higher than the highest position of the casting space of the mold, the replenishment port will be provided on the side of the mold, which may be difficult to achieve when trying to automate casting. The space is occupied, causing trouble in the arrangement of each device.

On the other hand, if an opening/closing lid is provided at the replenishment port and the opening/closing lid is operated to prevent molten metal from flowing out, the heavy opening/closing lid must be airtightly installed and removed frequently in a high-heat work area. requires time and skill.

If the opening/closing lid cannot be airtightly attached to the refilling port, gas will leak when gas pressure is applied to the surface of the molten metal, and high-temperature molten metal will overflow from the refilling port, which is dangerous and Cleaning up afterwards will be a pain.

For this reason, there has been a demand for a device that can safely and reliably attach the opening/closing lid to the supply port with a mechanically simple structure, but there is no such device yet.

(Means for solving the problem) The molten metal replenishment port of the holding furnace of the present invention was devised to solve the above problems, and has an opening/closing lid for the molten metal holding furnace in a low-pressure casting device. At the molten metal replenishment port, a support tube groove consisting of a helicoid groove and a vertical groove continuous to the lower end of the helicoid groove is provided in the support tube into which the operating shaft having an engagement protrusion fits, and the operation shaft is engaged with this support tube groove. The essential configuration is that the mating projections are engaged, a cylinder mechanism is connected to the lower end of this operating shaft, a support arm is provided at the upper end of this operating shaft, and this support arm is equipped with an opening/closing lid for the molten metal replenishment port. It is something.

In order to attach and remove the lid of the molten metal replenishment port of the holding furnace of this invention in accordance with the molten metal replenishment work, a cylinder mechanism is operated by remote control, and the operation of this cylinder mechanism causes the lid of the molten metal replenishment port to be attached to the replenishment port. Attached and removed.

(Operations and Examples) The molten metal replenishment port of the holding furnace of the present invention is provided in the holding furnace as shown in FIG. 1, and enlarged views of the molten metal replenishment port portion are shown in FIGS. 2 and 3.

The molten metal replenishment port has an engaging protrusion 1, as its operating state is sequentially shown in FIG. 4a, FIG. 4b, FIG. 4c, and FIG. 4d. The engaging protrusion 1 of the operating shaft 2 engaged with the helicoid groove 4 of the support tube 3 into which the operating shaft 2 fits and the vertical groove 5 continuous to the lower end of the helicoid groove 4 is connected to the operating shaft 2 connected to the cylinder mechanism 6. As it rises and falls, it slides within the support cylinder groove 7.

Therefore, to explain from the state where the opening/closing lid 8 is closed, the cylinder mechanism 6 is extended and operated, and the operating shaft 2 is opened.
As the engaging protrusion 1 first moves up inside the vertical groove 5 according to the shape of the support tube groove 7, the operating shaft 2 also rises, and the supporting arm 13 provided at the upper end of the operating shaft 2 moves upward. The equipped opening/closing lid 8 also rises.

The "tenon" part 9 of the opening/closing lid 8 (the part inserted into the inner diameter part of the molten metal replenishment port) is completely inserted into the molten metal replenishment port 10.
(The length of the vertical groove should be designed to be longer than the tenon height of the opening/closing lid.) After that, the engaging protrusion 1 enters the helicoid groove 4, and the operating shaft 2 rotates accordingly. begins to rise. As the operating shaft 2 rises while rotating, the opening/closing lid 8 attached to the support arm 13 provided at the upper end of the operating shaft 2 rises.
Since it is turned to the side and the opening/closing lid 8 is removed to the side, the molten metal to be replenished can be easily poured from the molten metal replenishment port 10.

When the injection of molten metal is finished, the cylinder mechanism 6 is shortened and the operating shaft 2 is lowered, and the opening/closing lid 8 is lowered in the reverse order of the upward movement, and the molten metal replenishment port 1 is opened.
0, the molten metal supply port 10 and the opening/closing lid 8 are manufactured with dimensional accuracy to ensure airtightness, and the opening/closing lid is equipped with flexible refractory material. 2 is strongly pulled downward, and the support arm 13 provided at the upper end 2 of the operation shaft 2 strongly presses the opening/closing lid 8 against the molten metal supply port 10.
Even when the molten metal surface in the molten metal container 12 of the holding furnace 11 is pressurized with gas, the molten metal does not flow out from the molten metal supply port 10.

Since both the molten metal supply port 10 and the opening/closing lid 8 are exposed to high temperatures, they are made of refractory material. There is no leakage that would cause any problems.

Further, the holding furnace 11 is provided with an opening 14 for removing impurities or for internal inspection, along with a door.
Impurities are removed from here, and the inside of the holding furnace is maintained and inspected when the furnace operation is interrupted.

(Effects of the invention) In the molten metal replenishment port of the holding furnace of the present invention, the cylinder mechanism is operated remotely to attach and remove the opening/closing lid that opens and closes the molten metal replenishment port. It is safe because the operator can attach and remove the opening/closing lid from a distance.

Furthermore, since the opening/closing lid is attached to and removed from the molten metal replenishing port by mechanical operation, the attachment position is accurate and the opening/closing lid will not be damaged by colliding with other objects. Therefore, in addition to complete sealing,
This has the advantage that the service life of the opening/closing lid is extended and maintenance costs are reduced.

As described above in detail, the purpose, structure, and effects of the present invention, the present invention has an unprecedented structure and excellent effects, and greatly contributes to the development of industry.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a holding furnace in which a molten metal replenishment port of the holding furnace of the present invention is provided; This is an explanatory diagram showing the operating state of the molten metal replenishment port of the holding furnace, and FIG. 4a, which is a partial diagram, is an explanatory diagram when the opening/closing lid is closed, and FIG. 4b is an explanatory diagram when the opening/closing lid is raised vertically. Fig. 4c is an explanatory diagram of the state in which the opening/closing lid has further risen and started turning to the side, and Fig. 4 d is an explanatory diagram of the opening/closing lid which has risen further and has completed its rotation, and there is no problem in pouring the molten metal. It is an explanatory view when the state is reached. 1: Engagement protrusion, 2: Operation shaft, 3: Support cylinder, 4:
Helicoid groove, 5: Vertical groove, 6: Cylinder mechanism, 7: Support tube groove, 8: Opening/closing lid, 9: Opening/closing lid tenon, 10: Molten metal supply port, 11: Holding furnace, 12: Molten metal container, 13: Support Arm, 14: opening.

Claims (1)

[Scope of utility model registration request] In a molten metal replenishment port with an opening/closing lid of a molten metal holding furnace in a low-pressure casting device, a support cylinder groove into which an operating shaft having an engaging protrusion is fitted is provided with a support cylinder groove consisting of a helicoid groove and a vertical groove continuous to the lower end of the helicoid groove. is provided, an engagement protrusion of the operating shaft is engaged with the support cylindrical groove, a cylinder mechanism is connected to the lower end of the operating shaft, a support arm is provided at the upper end of the operating shaft,
A molten metal replenishment port for a holding furnace characterized in that the support arm is equipped with an opening/closing lid for the molten metal replenishment port.