JPH086009Y2 - Powder production equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder producing apparatus for producing a metal powder by a gas atomizing method, and more particularly to a powder producing apparatus capable of preventing a lump of molten metal from falling.

[0002]

2. Description of the Related Art As a device for producing a metal powder, a powder producing device using a gas atomizing method has been conventionally known. This apparatus stores a metal sample in a melting crucible, melts it by induction heating, and injects it into a lower injection chamber from a molten metal nozzle provided at the bottom of the melting crucible. At this time, an inert gas is jetted at a high speed from a gas jet nozzle provided at the lower end of the molten metal nozzle, and the molten metal jetted from the molten metal nozzle is made into metal powder by a gas atomizing method.

[0003]

In the powder manufacturing apparatus configured as described above, when the molten metal in the melting crucible is not jetted from the molten metal nozzle, the inlet of the molten metal nozzle is closed by the stopper. . However, if the blockage by the stopper is not complete, the molten metal may drop from the molten metal nozzle as a lump and enter the recovery pot for recovering the metal powder. Also, during the initial hot water discharge, while the inert gas is not jetted from the gas jet nozzle
Had the same problem. That is, the molten metal nozzle
Prevents clogging of the molten metal due to the temperature drop of the molten metal when passing through
To stop it, spray the inert gas after the melting of the metal is completed.
It is good to open the gate valve, raise the melt stopper, pass through the melt nozzle, and heat the nozzle without spraying.
However, even in this case, the molten metal drops from the molten metal nozzle as a lump.
The problem of defeating occurs.

The present invention has been made in view of the above points, and an object of the present invention is to provide a powder production apparatus capable of preventing the molten metal from falling into the collection pot in a lump form without becoming a powder state.

[0005]

In order to achieve the above object, the present invention is to melt a metal sample in a melting crucible by induction heating, and melt the melted metal at the bottom of the melting crucible. Drop through and fall through
Injection of high-pressure gas from a gas jet nozzle onto molten metal
To, in the powder production apparatus for producing a metal powder, wherein
When high-pressure gas is not ejected from the gas jet nozzle
Receives the molten metal falling from the molten metal nozzle
Positioned to get from the gas jet nozzle
Of the high pressure gas in response to a signal to start the injection of high pressure gas
It is characterized in that a hot water receiving member that retracts to a position that does not hinder the injection is provided.

[0006]

According to the powder producing apparatus having the above-mentioned structure, since the molten metal receiving member is located under the molten metal nozzle when the gas is not injected, the lump of metal which has not been pulverized is generated from the molten metal nozzle. Even if it falls, it can be caught by the hot water receiving member and will not enter the recovery pot. Further, the molten metal receiving member retreats from the lower portion of the molten metal nozzle in conjunction with the gas injection, so that the powdered metal is collected in the collecting pot.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the powder producing apparatus of the present invention will be described below with reference to the drawings.

1 and 2 show the construction of an embodiment of the present invention. FIG. 2 shows a schematic configuration of the powder production apparatus according to this example. An upper injection chamber 2 is fixed on the gantry 1, and a lower injection chamber 3 is provided below the upper injection chamber 2 so as to be in close contact therewith. The lower injection chamber 3 is supported by a carriage 4, and a recovery pot 5 for recovering the manufactured powder is detachably attached to the lower end of the lower injection chamber 3. The upper injection chamber 2 is provided with a front view window 6, a hot water receiving mechanism 7, and an internal lighting device 8, and a melting portion 9 is attached to the upper portion.

A gas jet nozzle 10 to be described later is provided between the melting section 9 and the upper injection chamber 2, and a gas release valve 11 is connected to the upper injection chamber 2. A melting chamber 12 is provided above the melting unit 9, and the inside of the melting chamber 12 is evacuated by a vacuum exhaust device 13. In addition, in the melting chamber 12, a sample addition rod 14 for adding a metal sample and a shelving rod 15 are added.
And are attached. Reference numeral 16 shown in FIG. 1 is a surge tank, and reference numeral 17 is a compound meter.

FIG. 1 shows the detailed structure of the melting portion 9. A coil 22 for induction heating is wound around the outer cylinder 21 of the melting section 9. The bottom plate 23 of the outer cylinder 21 is mounted on the upper injection chamber 2 via a water-cooled copper plate 26, and the bottom of the melting crucible 24, the bottom plate 23, and the upper wall of the upper injection chamber 2 are concentrically formed with holes. 24a, 23a and 2a are formed. A molten metal nozzle 27 is attached to the holes 24a and 23a, and a gas jet nozzle 10 is attached to the hole 2a.

The upper end surface of the molten metal nozzle 27 is formed with a concave portion 27a having an inverted conical shape of about 90 degrees, and the cylinder 18 shown in FIG.
The molten metal nozzle 27 is opened and closed by the stopper 28 that is driven up and down by the. The lower end of the melt nozzle 27 is fitted in the center hole of the gas jet nozzle 10, and a large number of injection holes (not shown) are concentrically formed on the outer periphery of the center hole of the gas jet nozzle 10. Then, an inert gas such as Ar supplied through the pipe 29 passes through the jet nozzle 10 and is jetted from the jet holes. On the lower surface of the center hole of the gas jet nozzle 10, there is provided a gate valve 30 which moves in the direction of arrow AA by a cylinder (not shown).

A hot water receiving mechanism 7, which is a feature of this embodiment, is provided on the inner surface of the upper portion of the upper injection chamber 2. The hot water receiving mechanism 7 includes an air cylinder 31 and a drive shaft 32 of the air cylinder 31.
And an arm 33 attached to the arm 33, and a substantially bottomed cylindrical molten metal receiver 34 as a molten metal receiving member supported at the tip of the arm 33. The air cylinder 31 is fixed to the outside of the upper injection chamber 2 via a bracket 35, and the upper end of the arm 33 is brought into contact with the upper inner surface of the upper injection chamber 2 to roll the wheels 36.
Are provided rotatably. The molten metal receiver 34 is detachably supported by a hook portion 33a formed at the tip of the arm 33 via a support shaft 37. By driving the air cylinder 31, the molten metal receiver 34 moves between a position directly below the molten metal nozzle 27 and a position separated from the molten metal nozzle 27.

In the powder producing apparatus constructed as described above, the melting crucible 24 containing the metal sample is placed in the melting section 9 which is evacuated by the vacuum evacuation device 13, and the molten metal nozzle 27 is It is closed by a stopper 28. When a high frequency voltage is applied to the coil 22, the metal sample in the melting crucible 24 is induction-heated and melted. Next, the molten metal is pressurized in the melting chamber 12 so as to be discharged, the gate valve 30 is opened, and at the same time, the molten metal stopper 28 is attached to the air cylinder 3.
Raised by driving the 1 performs Hatsuyu emissions set by Hatsuyu tapping timer from the gas jet nozzle 10
Keep the molten metal for several seconds without injecting the inert gas.
The molten metal nozzle 27 is heated by passing it through the sledge 27. That
Then, after the molten metal nozzle 27 has risen to an appropriate temperature , an inert gas is supplied to the gas jet nozzle 10 and injected from the injection hole to the outer periphery of the lower end of the molten metal nozzle 27. As a result, the molten metal becomes powder due to the gas atomizing action, and the injection chamber 2,
It is collected in the collection pot 5 through Upper injection chamber 2
The inert gas injected inside is released to the outside through the gas release valve 11.

According to this embodiment, the gas jet nozzle 10
While the inert gas is not being injected from the
The molten metal receiver 34 is moved right below the molten metal nozzle 27 by 31, and the air cylinder 31 is automatically operated by a signal from the gas jet nozzle 10 to start the injection of the inert gas,
It moves from a position directly below the molten metal nozzle 27. At this time, the gate valve 30 is retracted. Therefore, even if a lump of non-powdered metal falls from the melt nozzle 27 when the inert gas is not being jetted, the melt receiver 34 captures this lump and does not fall into the recovery pot 5. .

[0015]

As described above, according to the powder producing apparatus of the present invention, since the molten metal receiving member is provided which moves in conjunction with the gas injection and opens and closes the lower portion of the molten metal nozzle, the molten metal is in a lump form. It can be prevented from falling into the collection pot.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a melting section of an embodiment of the powder manufacturing apparatus of the present invention.

FIG. 2 is a front view showing the overall schematic configuration of an embodiment of the powder producing apparatus of the present invention.

[Explanation of symbols]

24 Melting crucible 27 Molten metal nozzle 34 Melting receiver (melt receiving member)

Claims (1)

[Scope of utility model registration request] 1. A metal sample in a melting crucible is melted by induction heating, and the melted metal is dropped through a molten metal nozzle provided at the bottom of the melting crucible and dropped.
Injection of high-pressure gas from a gas jet nozzle onto molten metal
To, in the powder production apparatus for producing a metal powder, wherein
When high-pressure gas is not ejected from the gas jet nozzle
Receives the molten metal falling from the molten metal nozzle
Positioned to get from the gas jet nozzle
Of the high pressure gas in response to a signal to start the injection of high pressure gas
A powder manufacturing apparatus comprising a hot water receiving member that retracts to a position where it does not hinder jetting .