JPS5829187B2 - Molten metal extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for pouring metal into molds stored in a container.
This invention relates to a device for smoothly taking out the material.

Generally, an electromagnetic pouring device is used to take out this type of molten metal, which uses the molten metal as a secondary conductor to generate thrust. A component of an automatic pouring device is connected to a pump L and controls the thrust generated based on the interaction between the moving magnetic field generated by the electromagnetic pump and the eddy current generated in the molten metal existing in the molten metal guide hole in the electromagnetic pump. It is desirable that the refractory wall of the electromagnetic pump be formed as thin as possible in order to efficiently pass the magnetic flux based on the moving magnetic field to the molten metal existing in the inlet hole formed by the refractory wall.

Therefore, the fireproof wall that forms the molten metal introduction hole of the electromagnetic pump tends to be formed much thinner than the fireproof wall that forms the container.

For this reason, like the fireproof wall of the electromagnetic pump of a conventional electromagnetic pouring device, the extremely high temperature molten metal continues to come into contact with the molten metal hole, not only during pouring but also during non-pouring for a longer period of time. The frequency of damage to the electromagnetic pump increases, which in turn increases the frequency of replacing the electromagnetic pump.

Therefore, each time the electromagnetic pump is replaced, pouring becomes impossible for a certain period of time, resulting in a drop in pouring efficiency.

Therefore, when automatically pouring molten metal accumulated in a container into an external mold, etc., it is necessary to place an electromagnetic pump on the top of the container, for example, to prevent molten metal from entering the molten metal introduction hole in the magnetic pump when not pouring. A conceivable configuration is that the molten metal is sucked up and taken out only when pouring molten metal.

However, if there is no molten metal in the electromagnetic pump lead hole, there is no room for the electromagnetic pump to work, so it is necessary to introduce molten metal from the outside into the electromagnetic pump lead hole as a so-called priming water, which is a fairly complicated process. Because of the structure, there is a drawback that it is difficult to put it into practical use.

An object of the present invention is to provide a molten metal extraction device that eliminates the drawbacks of the conventional method by skillfully combining an electromagnetic pump and a vacuum pump that control pouring of molten metal, has a simple structure, and maintains the durability of the electromagnetic pump. It is in.

Hereinafter, one specific example illustrating the apparatus according to the present invention will be described in detail.

The figure is a partially cutaway sectional view, and 1 is a container made of a refractory material, which holds molten metal 2 in its internal space.

Reference numeral 3 denotes a heat-resistant pipe that guides the molten metal 2 in the container 1 to an external mold or the like, and is made of, for example, a refractory material containing carbon.

One end 3a of this pipe 3 is connected to the container at a position close to the bottom, and the other end 3b is open to the outside.

Unfortunately, this pipe 3 branches in the middle, and this branch point pK is provided with an air filter 4 that prevents the passage of molten metal and allows air to pass.A vacuum pump 6 is connected from this air filter 4 via an electromagnetic valve 5. It is connected.

γ is an electromagnetic pump, which is composed of an iron core 7a, a groove 7b formed in the iron core 7a, an AC winding 7c housed in the groove 7b, and an insulating heat-resistant material 7e. Go out and see the location P1 where the air filter 4 is located
For example, it is attached along the outer periphery of the pipe 3 at the outgoing portion of the container 1.

At this time, the molten metal 2 located close to the inner peripheral surface of the pipe 3
Since the electromagnetic pump 7 receives a strong thrust, the efficiency of the electromagnetic pump 7 is improved by providing a cylindrical body 3c made of the same material as the pipe 3 inside the pipe 3 at a location where the electromagnetic pump 7 is attached.

Reference numeral 8 denotes a sealing body which acts to prevent air from being sucked into the pipe 3 from the outer end 3b of the heat-resistant pipe 3.

However, the sealing body 8 may be made of plastic, for example, so as not to block the passage of the molten metal 2 to the outside and vaporized by the heat of the molten metal 2, or if the molten metal 2 is made of aluminum, an aluminum plug may be used. The heat of the molten metal 2 causes the molten metal to assimilate and sludge.

In other words, the sealing body 8 may be formed of clay, and the holes may be poked by some means, such as a rod-shaped body (not shown), only when the molten metal 2 passes through.

In the above configuration, when the heat-resistant pipe 3 contains molten metal 2 equal to the molten metal level in the container 1, the electromagnetic valve 5 is opened without changing, and the seal 8 is inserted into the heat-resistant pipe 3. Outer end 3b [attached.

When the vacuum pump 6 is operated, the heat-resistant pipe 3 has both open ends 3a and 3b exposed to the molten metal 2 and the sealing body 8.
, the internal space of the pipe 3 has a negative pressure.

Therefore, the heat-resistant pipe 3 sucks the molten metal 2 from the tip 3a covered with the molten metal 2, and when it reaches the position where the electromagnetic pump 7 is located and reaches the zero point at 1, the electromagnetic valve 5 is closed and the vacuum pump 6 operates. is substantially stopped, power is supplied to the AC winding 7c of the electromagnetic pump 7, and magnetic flux based on the moving magnetic field passes through the molten metal 2 in the heat-resistant pipe in the portion forming the molten metal introduction hole of the electromagnetic pump 7 [-1 Eddy currents occur.

Based on the interaction between this eddy current and the magnetic flux generated by the moving magnetic field, the molten metal 2 moves in the direction of the outer end 3b of the heat-resistant pipe 3 with a thrust.

Next, when the molten metal 2 reaches the enclosure 8, if the enclosure 8 is made of a plastic material, it will be vaporized by the heat of the molten metal 2, and if it is made of an aluminum material, the molten metal will be vaporized. It will be assimilated into the molten metal.

In this way, once the molten metal reaches the electromagnetic pump 7 and the molten metal 2 begins to move through the heat-resistant pipe due to the thrust generated by the electromagnetic pump 7, there is no need to operate the vacuum pump 6, and the molten metal increases per unit time. A fixed amount of molten metal is supplied using an electromagnetic pump that can accurately dispense the amount.

That is, when taking out the molten metal into the mold etc., due to the action of the air filter 4, the molten metal may be mistakenly transferred to the vacuum pump 6 side or not at all.

On the other hand, when the extraction of molten metal is continued and stopped, the power supply to the electromagnetic pump 7 is stopped, and the molten metal in the heat-resistant pipe 3 is returned within the range 1 regulated to the molten metal level in the container 1. Make sure that there is no molten metal in the area of the electromagnetic pump.

When taking out the molten metal again, the same vacuum pump 6 as above is used.
After the electromagnetic pump 7 is activated, the electromagnetic pump 7 is activated.

Although the configuration of the above embodiment shows a configuration in which a solenoid valve 5 is arranged between an air filter 4 and a vacuum pump 6, it is possible to control the operation of the vacuum pump 6. It is not necessarily necessary to provide the solenoid valve 5 described above.

As described above, when taking out the molten metal 2 in the container 1 to an external mold or the like, the molten metal removal device according to the present invention, when the molten metal removal is stopped, removes the molten metal that has not yet reached the location where the electromagnetic pump 7 is located. Based on the action of the vacuum pump 6, the molten metal is transferred through the heat-resistant pipe at a position 1 where the electromagnetic pump 7 can substantially act, and thereafter the molten metal is taken out by the action of the electromagnetic pump 7. 1P Based on the above configuration, molten metal reaches the electromagnetic pump 7 only during the 7 molten metal removal periods, and does not reach the molten metal during other molten metal removal suspension periods.

Therefore, the insulating and fireproof wall of the electromagnetic pump increases its durability and allows the replacement interval of the electromagnetic pump to be significantly longer than in conventional electromagnetic pumps that are constantly filled with molten metal.

・In step 1, the electromagnetic pump obtains enough thrust to promote the transfer of the molten metal, and the vacuum pump 7 and the seal 8 raise the molten metal through the action of the vacuum pump 7 and the seal 8. It has excellent features such as not requiring a complicated structure unlike the case where molten metal is applied externally using a water method.

[Brief explanation of the drawing]

The figure is a partially cutaway view showing an embodiment of the present invention. 1... Container, 2... Molten metal, 3...
...Heat-resistant pipe, 4...Air filter, 5.
...Solenoid valve, 6...Vacuum pump, 7...
...Electromagnetic pump, 8...Enclosed body.

Claims (1)

[Claims] 1 Place one end of the heat-resistant pipe into the molten metal in the container, place an electromagnetic pump at an appropriate place on the heat-resistant pipe that does not touch the molten metal in the container, and connect the end of the heat-resistant pipe on the molten metal outlet side to the electromagnetic pump. A branch path is provided from the middle of the connecting path to prevent the passage of the molten metal, and the air filter is connected to the vacuum pump directly or via a solenoid valve, and on the other hand,
Prevent outside air from being drawn into the molten metal outlet of the heat-resistant pipe12.
1. A molten metal removal device, characterized in that the molten metal is provided with a seal that allows the flow of the molten metal.