JPH0534846Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an opening/closing device for a molten metal replenishment port, etc., for replenishing molten aluminum into a holding furnace of a low-pressure casting machine.

(Problems to be solved by the prior art and the invention) Molten metal replenishment port of the holding furnace in a low-pressure casting machine, furnace interior inspection port, furnace oxide (slag) scraping port, etc. (hereinafter referred to as molten metal replenishment port, etc.) Because the holding furnace is pressurized when pouring into the mold, it must be closed airtight. Conventionally, the molten metal replenishment port and the like are closed with a lid having an asbestos-based sealing member attached to the inner peripheral edge so as to withstand the high heat of the holding furnace. However, this sealing member has poor elasticity,
Even if the lid is pressed with strong force, a complete airtight state cannot be obtained. Furthermore, the use of asbestos has recently become a problem from an environmental hygiene standpoint.

In such a case, it may be possible to water-cool the part of the molten metal supply port that contacts the lid, and use a sealing member made of a material that is inferior to asbestos in heat resistance but superior in elasticity. This method was difficult to implement because there was a risk that the cooling water would come into contact with the molten aluminum in the holding furnace and cause an explosion.

The present invention was developed in view of the above-mentioned circumstances, and it is designed to water-cool the part of the molten metal supply port that contacts the lid of a low-pressure casting machine, and also to open and close it so that cooling water does not flow into the holding furnace. The purpose is to provide equipment.

(Means for Solving the Problems) In order to achieve the above object, the present invention airtightly installs an annular lid receiving seat having a predetermined thickness on the upper end surface of the molten metal replenishment port, etc. of the holding furnace in a low-pressure casting machine. A recess is formed on the upper surface of the lid receiving seat, and a drainage hole is provided on the outer circumferential surface of the lower position side of the seat to pass through the recess, and a cooling water channel is provided inside the lid receiving seat immediately adjacent to the recess. A water supply port is provided in the outer circumferential surface of the lid receiving seat, and a water supply port that communicates with one end of the water channel and a drainage port that communicates with the other end of the water channel are provided in the outer circumferential surface of the lid receiving seat. and disposing a lid above the lid receiving seat, the top opening of the lid receiving seat being able to be opened and closed;
A protrusion that can be loosely fitted into the recess of the lid receiving seat is formed on the peripheral edge of the lower surface of the lid, and a sealing member that is highly elastic and has a predetermined heat resistance is attached to the lower surface of the protrusion. It is said that

Hereinafter, the present invention will be explained in detail based on examples.

(Configuration of Embodiment) FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a schematic sectional view of a low pressure casting machine.

In the figure, 1 is a holding furnace, 2 is molten aluminum held in the holding furnace 1, 3 is a molten metal replenishment port for replenishing molten aluminum into the holding furnace 1, 4 is a lid of the replenishment port, and 5 is an air or gas supply port. An inlet pipe, 6 a die plate, 7 a hot water supply pipe, and 8 a mold. Note that the mold 8 is moved to the die plate 6 by an elevating means (not shown).
It is made possible to move up and down by separating it from the main body. Further, the upper end of the hot water supply pipe 7 passes through the center of the die plate 6 and communicates with the mold 8. During casting, air or gas pressure is applied from the inlet pipe 5 onto the surface of the molten aluminum 2 supplied into the holding furnace 1 from the molten metal replenishment port 3, thereby transferring the molten metal 2 into the metal supply pipe 7. It is configured to be pushed up and injected into the mold 8.

A lid receiving seat 9 having an annular plane and a predetermined thickness is attached to the upper end surface of the molten metal replenishment port 3 with its axis aligned with the axis of the molten metal replenishment port 3. The surface is kept airtight by a ring-shaped seal member 11. The lid receiving seat 9
A recess 12 is formed in an annular shape around the axis of the seat 9 on the upper surface, and a drainage hole 10 penetrating into the recess 12 is formed on the outer peripheral surface of the lower position side of the lid receiving seat 9.
is provided. Further, inside the lid receiving seat 9, a ring-shaped cooling water channel 13 centered on the axis of the seat 9 is located immediately below the recess 12 and sufficiently far away from the inner circumferential surface of the lid receiving seat 9. Further, a water supply port 14 communicating with one end of the water channel 13 and a drain port (not shown) communicating with the other end of the water channel 13 are provided on the outer peripheral surface of the lid receiving seat 9. It is perforated. The water supply port 14 is connected to a water source (not shown) via a hose 15, and a hose (not shown) is connected to the drain port to prevent drainage from flowing into the holding furnace 1.
The lid 4 is disposed above the lid receiving seat 9, and the upper end opening of the lid receiving seat 9 can be opened and closed by a conventional opening/closing mechanism. At the lower peripheral edge of the lid 4,
A protrusion 16 that can be fitted loosely into the recess 12 of the lid receiving seat 9 is formed on the lower surface of the protrusion 16.Although it is inferior to asbestos-based sealing members in heat resistance, it is superior in elasticity. A seal member 17 made of silicone or fluorine rubber is attached, and when the lid 4 is closed, the seal member 1
7 comes into contact with the bottom surface of the recess 12 of the lid receiving seat 9 to airtightly close the upper end opening of the lid receiving seat 9. Note that 18 is a heat insulating member for protecting the lid 4 from radiant heat of the molten metal.

Note that the lid receiving seat 9 may be a frame with a rectangular plane, and in that case, the lid 4 also has a rectangular planar shape.

(Operations and effects of the embodiment) In the structure as described above, when cooling water is introduced from the water supply port 15 into the water channel 13 bored inside the lid receiving seat 9 and circulated, the lid receiving seat 9 The bottom surface of the recess 12 of the seat 9 is cooled.

When the lid 4 is closed in this state, the sealing member 17 attached to the lower surface of the peripheral protrusion 16 of the lid 4 closes.
contacts the bottom surface of the recess 12 of the lid receiving seat 9, but since this part is cooled, it will not be damaged by heat even if the seal member 17 is inferior in heat resistance to conventional asbestos-based seal members. . Furthermore, since the sealing member 17 is highly elastic, the lid 4
Complete airtightness can be achieved without pressing with strong force. Furthermore, since no asbestos-based materials are used, there are no environmental health problems.

The water channel 13 inside the lid receiving seat 9 is bored just below the recess 12 of the seat 9 and at a sufficient distance from the inner peripheral surface of the seat 9, so that in the unlikely event that the seat 9
If a crack occurs in the recess 12, the crack is generated in the direction of the recess 12. When water leaks due to the crack, the water flows into the recess 12,
Since the water is discharged outside the machine from the drain hole 10, the risk of water flowing into the holding furnace 1 and coming into contact with the molten aluminum inside and causing an explosion is avoided.

In this embodiment, as shown in FIG. 3, if a heat insulating material 19 is interposed between the upper end surface of the molten metal replenishing port 3 and the lower end surface of the lid receiving seat 9, high heat from the holding furnace 1 will be transferred to the lid receiving portion. It is possible to reduce the conduction to the seat 9, thereby increasing the cooling effect of the bottom surface of the recess 12 of the lid receiving seat 9.

Note that the embodiment relates to an opening/closing device for a molten metal replenishment port in a holding furnace, but the present invention relates to an inspection lid for a holding furnace,
It can also be applied to slag scrapers, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a schematic sectional view of a low pressure casting machine, and FIG. 3 is a sectional view showing an improved embodiment of the invention. 1... Holding furnace, 3... Molten metal supply port, 4... Lid,
9...Lid receiving seat, 10...Drain hole, 12...Recess, 13...Waterway, 14...Water inlet, 16...Protrusion, 17...Sealing member.

Claims (1)

[Scope of utility model registration request] An annular lid receiving seat 9 having a predetermined thickness is airtightly fixed to the upper end surface of the molten metal supply port 3, etc. of the holding furnace 1 in a low-pressure casting machine, and a recess 1 is formed on the upper surface of the lid receiving seat 9.
2, and a discharge hole 10 penetrating the recess 12 is provided on the outer peripheral surface of the lower position side of the seat 9, and a cooling water channel 13 is provided inside the lid receiving seat 9 immediately below the recess 12 and at the seat 9. 9, and a water supply port 14 communicating with one end of the water channel 13 and a drain port communicating with the other end of the water channel 13 are bored in the outer peripheral surface of the lid receiving seat 9. A lid 4 is disposed above the lid receiving seat 9 so that the upper end opening of the lid receiving seat 9 can be opened and closed, and a lid 4 is loosely fitted into the recess 12 of the lid receiving seat 9 on the lower peripheral edge of the lid 4. A molten metal replenishment port, etc. of a holding furnace in a low-pressure casting machine, characterized in that a sealing member 17 which is highly elastic and has a predetermined heat resistance is attached to the lower surface of the protrusion 16. switchgear.