JPH0227956Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a molten metal transfer device used in an automatic hot water supply device of a die-casting machine or a press-in mechanism of a hot chamber die-casting machine. The purpose is to transport the materials in a good manner.

[Conventional technology]

When manufacturing specified metal products using die casting equipment or hot chamber die casting equipment, molten metal (hereinafter simply referred to as molten metal) is transferred to these equipment using an automatic hot water supply device or a press-in mechanism. Become. That is, molten metal heated to a predetermined temperature is poured into a predetermined molding machine via a crucible.

FIG. 7 shows a typical configuration of a conventional molten metal transfer device.

In Fig. 7, a is a storage body such as a crucible or a melting pot that stores molten metal A, and inside this storage body a is a sleeve c constituting a cylinder.
A frame body b is arranged to hold the metal in an upright position in the molten metal A, and this frame body b has a suction hole d that communicates with the upper end of the sleeve c, a suction hole d that communicates with the lower end of the sleeve c, and a casting device. A spout hole e is formed which communicates with a spout nozzle f which is pressed against the nozzle touch g, and a piston h is assembled in the sleeve c so as to be able to vertically slide tightly therein.

In the conventional transfer device shown in FIG. 7, a certain amount of molten metal A is sucked into the sleeve c by pulling the piston h above the suction hole d, and from this state the piston h is lowered. As a result, the molten metal A in the sleeve c is transferred from the pouring hole e to the pouring nozzle f and into the casting apparatus g.

When the transfer of the molten metal A into the casting device g is completed, the piston h is raised to a position higher than the suction hole d, and the molten metal A is sucked into the sleeve c again to wait for the next transfer operation. be.

[Problem that the invention attempts to solve]

By the way, in terms of the workability of the automated molten metal transfer device, it is important to transfer clean molten metal, keep the amount of hot water supplied constant,
Requirements such as being able to easily adjust the amount of hot water supplied, having a fast hot water supply rate, and being safe in the hot water supply process are required.

However, although the conventional automated transfer device represented by the device shown in Figure 7 satisfies the requirements of maintaining a constant amount of hot water supply and a fast hot water supply rate, other requirements are met. The conditions could not be met and there was a lot of dissatisfaction.

That is, as is clear from the configuration shown in FIG.
When the piston h returns upward, a pressure decrease occurs within the transfer device, and this pressure decrease generates a partial vacuum within the spout e channel and within the sleeve c. In this state,
That is, if new molten metal A is replenished into the sleeve c without overlapping, dripping will occur when the mold of the casting device g is opened, and one of the above-mentioned requirements is to satisfy the condition of being safe in the hot water supply process. On the other hand, if a partial vacuum is generated in the transfer device and the overlapping method is applied to open the spout e passage to the atmosphere, dripping can be prevented, but the spout The level of molten metal in channel e has fallen abnormally, allowing air to enter sleeve c, making it impossible to meet the requirement of transporting clean molten metal.

Furthermore, in principle, the amount of hot water supplied can be easily and accurately adjusted by changing the stroke of the piston h, but in reality, changing the stroke of the piston h is
This is impossible without replacing the cylinder that is the driving source for the piston h, and therefore it is not possible to adjust the amount of hot water supplied without replacing the component parts.
Furthermore, even if it were possible to adjust the amount of hot water supplied, the adjustment operation was extremely troublesome.

The causes of the above-mentioned problems in the conventional technology are that pressure fluctuations occur in the spouting hole path due to the return movement of the piston that has completed the transfer of molten metal, and that the amount of hot water supplied is immovably fixed and the sleeve has a constant size. It is determined only by the size and stroke of the piston.

Therefore, in the present invention, the measurement operation of hot water supply, the transfer operation of molten metal, and the return operation are completely separated, and the measurement operation of hot water is completely isolated from the pouring hole path. In addition, the technical problem is to achieve the molten metal transfer operation in a state completely isolated from the suction hole path, and further to achieve the return operation in a state completely isolated from the suction hole path and the pouring hole path. That is.

[Means for solving problems]

Hereinafter, the present invention will be explained with reference to the drawings showing one embodiment of the present invention.

The means according to the present invention has a suction hole 3 communicating with the molten metal A in the lower part of the cylinder wall 2 having a straight cylindrical shape, and a spouting hole communicating with the pouring nozzle 5 in the upper part of the cylinder wall 2. The first plunger 6 has a piston 8 installed at the lower end of a straight circular rod 7, which is inserted and assembled into the sleeve 1 so as to be able to vertically and closely slide therein. , The rod 7 is inserted and assembled into the sleeve 1 so that it can be slid vertically tightly, and the rod 7 is inserted and assembled so that it can be slid vertically tightly, and the distance from the lower end of the suction hole 3 to the upper end of the spout hole 4 is The second plunger 9 has a straight cylindrical shape and has a long length.

That is, both the first plunger 6 and the second plunger 9 are inserted and assembled into the sleeve 1, and are assembled so that they can be moved up and down independently of each other within the sleeve 1. A space B formed between the first plunger 6 and the second plunger 9, that is, the space formed by the upper surface of the piston 8, the circumferential surface of the rod 7, the lower end surface of the second plunger 9, and the inner surface of the sleeve 1. B can communicate with the outside of the sleeve 1 only through the suction hole 3 or the spout hole 4 formed in the sleeve 1.

[Effect]

The transfer operation of molten metal A will be explained in order.

〇 Standby process (see Figure 1) First plunger 6 and second plunger 9
With the lower end surface of the second plunger 9 in close contact with the upper surface of the piston 8, the inside of the sleeve 1 is lowered together until the upper surface of the piston 8 is at the same height level as the lower end of the suction hole 3. .

In this state, the length of the second plunger 9 is
Since the height is greater than the height from the lower end of the suction hole 3 to the upper end of the spout hole 4, the spout hole 4 is
The plunger 9 is in a closed state.

〇 Measuring process (see Figure 2) When only the second plunger 9 is pulled up from the standby state while holding the first plunger 6 immovably relative to the sleeve 1, the pulling up of the second plunger 9 results in the following: The molten metal A is drawn into the space B formed between the second plunger 9, the first plunger 6, and the sleeve 1 through the suction hole 3, and is filled with the space B.

Since the inner diameter of the sleeve 1 and the diameter of the rod 7 remain constant, the volume of this space B is a value that is determined in exact proportion to the lifting distance of the second plunger 9. By adjusting and setting the lifting amount of 9, the volume of space B, that is, the amount of hot water supply, can be adjusted and set accurately and easily.

〇 Transfer preparation process (see Figure 3) Once the measuring of molten metal A by lifting only the second plunger 9 is completed, the lower end surface of the second plunger 9 is at the same height level as the upper end of the pouring hole 4. The second plunger 9 and the first plunger 6 are upwardly displaced integrally, that is, without changing the volume of the space B, until the position becomes .

Due to this upward displacement of the first plunger 6 together with the second plunger 9, the suction hole 3 is closed by the piston 8 of the first plunger 6, and communication with the space B is cut off. Due to the upward displacement of the plunger 9, the spout hole 4 enters the space B.
It will be in a state where it communicates with the upper end of.

〇 Transfer process (see Figures 4 and 5) When the transfer preparation is completed, move the first plunger 6 while holding the second plunger 9 immovably.
is raised, and the molten metal A in the space B is force-fed from the spout hole 4 to the spout nozzle 5, and transferred to a casting device (not shown).

When the transfer of the molten metal A weighed to a certain amount is completed, as shown in FIG.
This is achieved by bringing the upper surface of the piston 8 into close contact with the lower end surface of the second plunger 9, so that the spout hole 4 is closed by the piston 8 when the transfer is completed.

〇 Return process (see Figure 6) Once the transfer is completed, the first plunger 6 and the second plunger 9, which are in a state where the upper surface of the piston 8 is in close contact with the lower end surface of the second plunger 9, are integrated. Then, it is lowered back to the standby position shown in FIG. 1, returns to the standby step, and prepares for the next transfer operation.

During this return operation, the spout hole 4 is maintained in a closed state by the piston 8 of the first plunger 6 and the second plunger 9.

That is, the spout hole 4 communicating with the spout nozzle 5 communicates with the space B only immediately before the completion of the transfer preparation process and during the transfer process, and is always kept closed at other times. There is. Therefore, even if the first plunger 6 and the second plunger 9 move during the metering process and the return process, pressure fluctuations will not occur in the spouting hole 4 due to the movement of both plungers 6 and 9. Therefore, the inside of the spouting hole path including the spouting nozzle 5 is always maintained at a constant pressure, and no dripping or suction of outside air occurs.

〔Example〕

In the case of the illustrated embodiment, the cylindrical wall 2 with the spout hole 4
A retaining ring 10 is attached to the outer peripheral surface of the retaining ring 10, and the spout nozzle 5 is inserted into the hole 11 formed in the retaining ring 10.
By tightly fitting the base ends of the spout nozzle 5
The assembly into the sleeve 1 and the connection to the spout hole 4 have been achieved. Moreover, this retaining ring 10 is
It also serves as a part for assembling and holding the sleeve 1 so that the suction hole 3 opens directly at a depth of 1/3 of the molten metal A, and is attached through the retaining ring 10 by a mounting mechanism (not shown). The sleeve 1 is held in an upright position.

Although the liquid level of the molten metal A is never constant, the depth position of the suction hole 3 in the molten metal A must be maintained at a certain depth or more. Therefore, for example, molten metal A
At our facility where we have refilled the molten metal, there may be a situation where the retaining ring 10 is submerged in the molten metal A, but even if the retaining ring 10 is submerged in the molten metal A, no inconvenience will occur.

Further, the device of the present invention may be mostly located in the air, and the amount of hot water supplied is measured between the sleeve 1, the first plunger 6, and the second plunger 9, Furthermore, since the spout hole 4 is mainly blocked by the second plunger 9 at times other than during hot water supply operation, it is necessary to achieve and maintain sufficient airtightness between each component. Each component, namely sleeve 1,
a first plunger 6, a second plunger 9,
The combined clearance between the pouring nozzle 5 and the retaining ring 10 is set to a few microns or less, so that there is no flow of hot water or gas in each clearance.

Furthermore, the shaft radius of the rod 7 is r ₁ and the inner diameter of the sleeve 1 is r ₂ , and the upper end surface of the piston 8 and the second
If h is the opening distance from the lower end surface of the plunger 9, then the amount of molten metal sucked in during metering, that is, the amount of hot water supplied V, is V=(r ₂ ² − r ₁ ² ) π・h, and the amount of hot water V is the opening distance. It becomes a linear function of h.

Therefore, by setting (r ₂ ² −r ₁ ² )π=a, the hot water supply amount V can be easily and accurately set according to the opening distance h using the formula V=ah.

[Effect of idea]

As is clear from the above explanation, the present invention can completely prevent the hot water from coming into contact with the atmosphere, the gas being drawn into the hot water supply path, and the generation of hot water, so that clean molten metal is always supplied. It is possible,
In addition, a fixed amount of molten metal can be reliably supplied, and the amount of hot water supplied can be easily and quickly adjusted and set.Furthermore, hot water can be supplied only by the upward movement of the first plunger, making it extremely quick and smooth. This has been achieved, and since the inside of the pouring hole is maintained at a constant pressure except during the transfer operation, there is no dripping of hot water or drawing in of the atmosphere, which makes it possible to obtain a high level of safety in the hot water supply process, etc. It exhibits excellent effects.

[Brief explanation of the drawing]

Figures 1 to 6 show vertical cross-sectional views of each process of an embodiment of the device of the present invention. Figure 1 shows the standby state, Figure 2 shows the weighing state, and Figure 3 shows the transfer state. FIG. 4 shows the preparation state, FIG. 5 shows the transfer operation state, and FIG. 6 shows the return operation state. FIG. 7 is a longitudinal sectional view showing a typical example of a conventional automated molten metal transfer device. Explanation of symbols, 1...Sleeve, 2...Cylinder wall, 3
...Suction hole, 4... Outlet hole, 5... Output nozzle,
6...first plunger, 7...rod, 8...
...Piston, 9...Second plunger, 10...
...Retaining ring, A... Molten metal (molten metal), B...
space.

Claims (1)

[Scope of claim for utility model registration] Molten metal A is placed in the lower part of the cylinder wall 2 having a straight cylindrical shape.
A sleeve 1 has a suction hole 3 communicating therein, and a spout hole 4 that communicates with the spout nozzle 5 in the upper part of the cylindrical wall 2; A first plunger 6 has a piston 8 which is movably inserted and assembled at the lower end of a straight circular rod 7; and a first plunger 6 which is inserted and assembled into the sleeve 1 so as to be able to vertically and closely slide, and the rod 7. 7 is inserted and assembled so as to be able to vertically slide tightly, and has a straight cylindrical shape and has a length greater than the distance from the lower end of the suction hole 3 to the upper end of the spout hole 4; A molten metal transfer device consisting of: