JPH0227958Y2 - - 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 efficiently and efficiently.

[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. 10 shows a typical configuration of a conventional molten metal transfer device 1'.

In Fig. 10, a denotes a storage body such as a crucible or melting pot for storing molten metal K, which is held by a heating table b, and inside this storage body a is a sleeve e constituting a cylinder d. A frame c is arranged in the molten metal K to hold it in an upright position.

This frame c has an inlet f that communicates with the upper end of the sleeve e, and an outlet g that communicates with the lower end of the sleeve e and a pouring nozzle i pressed against the nozzle touch of the casting machine T. is formed,
A plunger h is assembled into the sleeve e so as to be vertically slidable in a tight manner.

In the conventional transfer device 1' shown in FIG. 10, by pulling up the plunger h above the suction port f, a certain amount of molten metal K is sucked into the sleeve e from the storage body a, By lowering the plunger h from this state, the molten metal K in the sleeve e is transferred from the discharge port g to the mold T' in the casting machine T via the pouring nozzle i.

When the transfer of the molten metal K into the casting machine T is completed, the plunger h is raised to a position above the suction port f, and the molten metal K is sucked into the sleeve e again to wait for the next transfer. be.

[The problem that the idea 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, maintain a constant amount of hot water supply,
Conditions 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 1' typified by the device shown in FIG. 10 satisfies the requirements of keeping the amount of hot water supplied constant and having a fast hot water supply rate, Other requirements could not be met, resulting in many dissatisfaction.

That is, as is clear from the configuration shown in FIG. 10, when the plunger h that has transferred the molten metal K rises and returns within the sleeve e, a pressure decrease change occurs within the sleeve e due to the upward return movement of the plunger h. This pressure reduction change creates a partial vacuum within the outlet g passage and within the sleeve e. In this state, that is, without overlapping, the sleeve e
If new molten metal K is sucked and refilled into the casting machine T, dripping will occur when the mold T' in the casting machine T is opened. If the overlap method is applied to open the discharge port G path to the atmosphere after a partial vacuum has been generated in e, it is possible to prevent dripping, but the molten metal level in the discharge port G path will be abnormally low. As a result, air enters the sleeve e, making it impossible to meet the requirement of transporting clean molten metal.

Furthermore, in principle, the amount of hot water can be adjusted by changing the stroke of the plunger h.
Although this can be achieved easily and accurately, in reality it is impossible to change the stroke of the plunger h unless the cylinder d, which is the driving source of the plunger h, is replaced, and the components for this purpose are It is not possible to adjust the amount of hot water supplied without replacing it, and even if the amount of hot water supplied can be adjusted, the adjustment operation is extremely troublesome.

The causes of the above-mentioned problems in the conventional technology are that pressure fluctuations occur in the discharge port g path due to the return operation of the plunger h that has completed the transfer of the molten metal, and that the amount of hot water supplied is fixed immovably at a constant size. This is determined only by the size of the sleeve e and the stroke of the plunger h.

Therefore, in the present invention, the hot water supply transfer operation and the return operation are completely separated and achieved, and the hot water metering operation is achieved at the same time as the return operation while being completely cut off from the discharge outlet path. The technical objective is to achieve the molten metal transfer operation in a state where it is completely cut off from the suction passage.

[Means to solve the problem]

In order to achieve the above object, the molten metal transfer device according to the present invention has a suction port opened at a portion of the straight cylindrical wall located in the molten metal in the crucible, and a a sleeve having a discharge port opened at a location on the cylindrical wall at an upper position and shifted by a predetermined central angle in the circumferential direction; The inserted and assembled linear cylindrical tube has a lower end face of the tube connected to the discharge port at a certain rotational position of the tube, and a predetermined central angle of the first tube. an inner sleeve forming a passage that communicates the lower end surface of the cylindrical body with the suction port in a rotational position; and a straight cylinder inserted and assembled tightly and slidably into the cylindrical body of the inner sleeve. A plunger is provided at the lower end of a shaped rod with a piston that is slidably inserted into the cylindrical wall below the suction port.

Further, a part of the outer circumferential surface of the cylindrical body of the inner sleeve is cut away from the lower part to the lower end to provide a notched groove.

[Effect]

In the above configuration, when the plunger is lowered and the molten metal is transferred, the inner sleeve is at a predetermined rotational position, and the passage of the inner sleeve and the discharge port of the sleeve are in communication with each other.
A space surrounded by the piston of the plunger, the rod, and the cylindrical inner circumferential surface of the inner sleeve is filled with molten metal.

In this state, when only the plunger is raised, the rod of the plunger is tightly and slidably inserted into the cylindrical body of the inner sleeve, and the piston is inserted into the cylindrical wall below the suction port. Since the insertion position is tightly slidable, the molten metal in the above-mentioned space is forced into the above-mentioned passage and is discharged from the discharge port, and at the upper limit of the plunger, the upper surface of the piston is at the lower end of the cylinder of the inner sleeve. come into contact with

Further, during this operation, since the suction port of the sleeve is sealed by the outer circumferential surface of the cylinder, the molten metal will not flow out from the suction port.

When this transfer and discharge operation is completed, the inner sleeve is axially rotated by a predetermined center angle, the passage is communicated with the suction port of the sleeve, and the discharge port is sealed by the outer circumferential surface of the cylindrical body.

Then, when the plunger is lowered from this state, the suction port is located in the molten metal in the crucible, and the movement of the piston creates negative pressure in the passage, so the molten metal is sucked through the suction port and the plunger It fills the above-mentioned space formed as it descends and waits.

Since the discharge port is sealed by the cylindrical body as described above, it is not affected by the downward return movement of the plunger, and therefore,
No dripping phenomenon occurs.

Moreover, since the molten metal does not come into contact with the atmosphere during the transfer/discharge operation of the molten metal or during the suction/return operation, clean molten metal is transferred.

Note that by cutting a part of the outer circumferential surface of the cylindrical body of the inner sleeve from the lower part to the lower end to provide a notch groove, a passage can be formed between the inner circumferential surface of the cylindrical wall of the sleeve and the inner circumferential surface of the cylindrical wall of the sleeve.

Furthermore, the amount of molten metal transferred is determined by the capacity of the space, and this capacity is adjusted by the amount of descent of the plunger.

〔Example〕

Examples will be described with reference to the drawings.

The transfer device 1 of the present invention includes a sleeve 2, an inner sleeve 4, and a plunger 3 as main components.

The sleeve 2 is made of ceramic or a specific metal, and as shown in FIG. In addition, a discharge port 2d is opened at a location of the cylinder wall 2a that is offset by a center angle of 180 degrees in the circumferential direction, and a bulge 2b is further provided around the outer peripheral surface of the upper end of the cylinder wall 2a.

The suction port 2c of the cylinder wall 2a is opened at a location located in the molten metal K in the crucible 11, and the sleeve 2 is
The suction port 2c is located in the molten metal K, and the discharge port 2c is located in the molten metal K.
d is fixed vertically so that it can maintain a position above the liquid level K ₁ of the molten metal K.

As this fixing means, the bulging portion 2b of the cylinder wall 2a is
The fixing flange 6 is attached to the upper end of the cylindrical fixture 7 that holds the upper end portion including the
A nozzle connecting ring 5 is fitted via a support 8 below the fixture 7 and around the periphery corresponding to the discharge port 2d of the cylindrical wall 2a.

In the nozzle connection ring 5, a nozzle insertion hole 5a is opened along the radial direction at a location opposite to the discharge port 2d, and an outlet nozzle 10 passes through the support 8.
is inserted into this nozzle insertion hole 5a and the discharge port 2
Connects to d.

Next, the inner sleeve 4, which is molded from ceramic or a predetermined metal, has a structure in which the outer circumferential surface of a linear cylindrical body 4a is cut from the lower part to the lower end to form a notched groove 4b. The diameter is equal to the inner diameter of the cylindrical wall 2a of the sleeve 2;
A is inserted and assembled in a manner that allows tight rotation until the lower end is below the above-mentioned suction port 2c.

Moreover, the notch groove 4b is formed between the lower end surface of the cylinder body 4a and the above-mentioned discharge port 2 when the cylinder body 4a is at a certain rotational position.
The vertical height and width of the cylinder body 4a are set so that the lower end surface of the cylinder body 4a and the suction port 2c can communicate with each other in the other rotational position shifted by the central angle of 180° of the cylinder body 4a. A passage B is formed by the cutout groove 4b and the inner surface of the cylindrical wall 2a of the sleeve 2.

Note that this passage B may be formed, for example, by forming the cylindrical body 4a thickly to form a conduit.

Next, the plunger 3 is inserted into the inner sleeve 4.
The cylindrical wall 2 of the sleeve 2 is attached to the lower end of the straight cylindrical rod 3a having an outer diameter equal to the inner diameter of the cylindrical body 4a.
The structure includes a piston 3b having an outer diameter equal to the inner diameter of the rod 4a, and the rod 3a is tightly and slidably inserted into the cylinder 4a. It is slidably inserted tightly into the wall 2a.

In the above structure, FIG. 1 shows the state immediately before the transfer of the molten metal K, with the plunger 3 lowered and the passage B of the inner sleeve 4 and the discharge port 2d of the sleeve 2 communicating with each other. 3, the piston 3b of the plunger 3, the rod 3a, and the inner sleeve 4
The molten metal K filled in the space A surrounded by the inner surface of the cylindrical body 4a is forced into the passage B (FIG. 2), and is discharged from the discharge port 2d to the outlet nozzle 10.
(Fig. 3), and is further filled into a mold in a predetermined casting machine, and the piston 3b
The upper surface abuts the lower end of the cylindrical body 4a of the inner sleeve 4.

In the series of operations described above, the inner sleeve 4 is inserted and assembled into the cylindrical wall 2a until its lower end is below the suction port 2c. It is sealed by.

When this transfer operation is completed, the inner sleeve 4 is rotated by a central angle of 180 degrees, and the above-mentioned passage B is brought into communication with the suction port 2c of the sleeve 4 (FIG. 4). Also, due to this axis rotation,
The discharge port 2d is sealed by the circumferential surface of the inner sleeve 4.

When the plunger 3 is lowered from this state, the suction port 2c is located in the molten metal K in the crucible 11, and the passage B is moved by the movement of the piston 3b.
Since the inside becomes negative pressure, the molten metal K is sucked in from the suction port 2c, fills the above-mentioned space A, and waits.

Further, the amount of molten metal K transferred is set by the capacity of the space A, and this capacity can be adjusted by the amount of descent of the plunger 3.

[Effect of idea]

As is clear from the above explanation, the present invention can completely prevent the molten metal from coming into contact with the atmosphere, the drawing of gas into the hot water supply path, and the generation of hot water, so that clean molten metal is always supplied. In addition, a fixed amount of molten metal can be reliably supplied, and the amount of hot water can be adjusted and set simply and quickly by simply adjusting the amount of descent of the plunger. It is smooth and accurate because it only involves the lifting and lowering movement of the plunger and the rotational movement of the inner sleeve, and since the pressure inside the spouting channel is maintained at a constant level except for the transfer movement, there is no dripping or drawing in of the atmosphere. Therefore, it exhibits many excellent effects such as being able to obtain high safety in hot water supply processing.

[Brief explanation of the drawing]

1 to 5 are longitudinal cross-sectional views of each process of an embodiment of the molten metal transfer device according to the present invention, in which FIG. 1 shows the molten metal immediately before the molten metal transfer operation, and FIG. During the transfer, FIG. 3 shows the molten metal immediately after the molten metal transfer operation, FIG. 4 shows the molten metal just before the molten metal suction operation, and FIG. 5 shows the standby state after the molten metal suction operation. In addition, FIG. 6 is a longitudinal cross-sectional view of the sleeve, and FIG. 7 is a cross-sectional view of the sleeve.
FIG. 8 is a perspective view of the nozzle connecting ring, and FIG. 9 is a perspective view of the inner sleeve. Furthermore, FIG. 10 is a sectional view of a conventional transfer device. Explanation of symbols, 1... Transfer device, 2... Sleeve, 2a... Cylinder wall, 2c... Suction port, 2d... Discharge port, 3... Plunger, 3a... Rod, 3
b... Piston, 4... Inner sleeve, 4a
... cylinder, 11 ... crucible, K ... molten metal.

Claims (1)

[Claims for Utility Model Registration] 1. A crucible 11 with a linear cylindrical wall 2a.
A sleeve in which an inlet 2c is opened at a location located in the molten metal K therein, and a discharge port 2d is opened at a location on the cylindrical wall 2a above the inlet 2c and shifted by a predetermined central angle in the circumferential direction. 2, a straight cylindrical cylinder 4a that is inserted and assembled into the cylinder wall 2a of the sleeve 2 so as to be tightly rotatable until its lower end is below the suction port 2c;
At a certain rotational position of the cylinder 4a, the cylinder 4a
A passage B that communicates the lower end surface of the cylinder body 4a with the discharge port 2d, and communicates the lower end surface of the cylinder body 4a with the suction port 2c at another rotational position shifted by a predetermined center angle of the cylinder body 4a. The inner sleeve 4 is formed with a straight cylindrical rod 3a that is tightly and slidably inserted into the cylindrical body 4a of the inner sleeve 4. A molten metal transfer device comprising: a plunger 3 provided with a piston 3b inserted into a wall 2a so as to be tightly slidable therein; 2 A part of the outer circumferential surface of the cylindrical body 4a is cut away from the location facing the discharge port 2d to the lower end to form the notched groove 4.
2. The molten metal transfer device according to claim 1, wherein the inner sleeve 4 is configured by providing the inner sleeve 4.