JPH0148329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing metal granules that efficiently produces metal particles having a high melting point.

Traditionally, equipment for producing metal granules includes:
There are rotating electrode types and rotating cup types.

The rotating electrode type uses a metal that is to be made into granules as an electrode, generates an arc between the opposing electrodes, and uses the heat to melt the metal while rotating the electrode, cooling the metal as granules. A device is used to insert the liquid into the medium.

If such a device is adopted, the electrode rotation speed in principle requires a high rotation speed of 10,000 to 50,000 R.PM, and the manufacturing device is required to have extremely high precision, and it is expensive because it is produced in small quantities. It also has the disadvantage of poor productivity.

The rotating cup type rotates a rotating cup that receives molten metal at high speed, uses centrifugal force to eject the molten metal from a nozzle formed on its circumference, and cools and solidifies in a cooling medium, turning it into granules. It's trying to get something.

When this rotating cup type is adopted, it is difficult to maintain the ambient temperature inside the rotating cup for a long time.
The drawback was that it had to rely on batch production, which inevitably led to high production costs.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide an apparatus for producing metal granules that is configured to be able to produce metal granules with high melting point extremely efficiently. The purpose is

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

The figures illustrate one embodiment of the invention.
In this figure, the symbol 1 is an electrode rod called a bus bar, which is arranged vertically.
Its lower end is rotatably supported within the base frame 2 by an insulating material 3 and a bearing receiver 6 formed at the upper end of the rod of the cylinder 5 via a bearing.

Further, within the base frame 2, the vicinity of the lower end of the electrode rod 1 is supported by guides 7, 7 so as to be able to rise and fall freely.

In addition, a power supply terminal 8 is provided near the guide 7.
is provided.

The power supply terminal 8 has a structure similar to a motor brush, and is always in sliding contact with the electrode rod 1, which can rotate and move up and down, and is connected to a negative power source.

A replaceable and consumable electrode rod 9 is provided at the upper end of the electrode rod 1.

Incidentally, a cylindrical shaft 10 is arranged on the outside of the electrode rod 1 concentrically therewith.

The lower end of the cylindrical shaft 10 is supported by a thrust bearing 11 provided on the base frame 2, and an insulating material 12 is interposed between the upper and lower ends of the cylindrical shaft 10 and the electrode rod 1.

Further, a pulley 1 is provided on the outside of the lower end of the cylindrical shaft 10.
3 is fixed, and a motor 1 is attached to the outside of the pulley 13 and the base frame 2 via a support 14.
A belt 17 is stretched between a pulley 16 fixed to the output shaft of the motor 15, and rotation is transmitted to the cylindrical shaft 10 when the motor 15 is started.

A rotating cup 18 is fixed to the upper end of the cylindrical shaft 10, and the electrode rod 9 is inserted into this rotating cup 18.
The upper end is supported by a support 19 made of ceramic or the like.

A plurality of nozzles 20 are arranged radially in the rotary cup 18.

By the way, a rotary cylinder 21 is further arranged on the outside of the cylindrical shaft 10 so as to be concentric with the cylindrical shaft 10.

The lower end of the rotary cylinder 21 is supported by a support frame 22 fixed on the base frame 2 via a strain bearing 23, and the upper and lower ends of the rotary cylinder 21 are supported by a bearing 24 relative to the cylindrical shaft 10. It is rotatably supported.

A pulley 25 is fixed in the middle of the rotary cylinder 21. A belt 29 is stretched between this pulley 25 and a pulley 28 fixed to the output shaft of a motor 27 attached to a support frame 26 provided on the side of the base frame 2. It is transmitted to the cylinder 21.

A cylindrical cooling water supply device 30 is attached to the base of the rotating cylinder 21 .

This cooling water supply device 30 has an annular flow path 31 on its inner circumferential surface, and this flow path 31 is connected to the rotary cylinder 21.
It communicates with an opening 21a formed on the side.

There are a plurality of these openings 21a, and cooling water supplied from a supply port 31a provided in the flow path 31 is supplied into the rotary cylinder 21 through these openings 21a.

An airtight state is maintained between the cooling water supply device 30 and the rotary cylinder 21 using a bearing 32 and an O-ring 32a as sealing materials.

The rotary cup 18 is attached to the upper end of the rotary cylinder 21.
A cylindrical body 33 is fixed in a state surrounding the cylindrical body 33, and the inside of this cylindrical body 33 communicates with the inside of the rotary cylinder 21 through an opening 21b formed in the cylindrical body 33 near its base.

The cylindrical body 33 has a spout 33a at a position corresponding to the nozzle 20 provided on the rotary cup 18.
Provide multiple.

The tip of the nozzle 20 is slightly inserted into the spout 33a.

Further, the outside of the cylindrical body 33 is covered with a casing 34, and one end of the casing 34 is formed with a discharge port 34a.

This discharge port 34a faces above the product receiving box 35, and below the product receiving box 35 is a water tank 36 that receives water falling through a small hole drilled in the bottom of the product receiving box 35. is located.

The rotary cylinder 21 is rotatably supported in the middle by a bearing 40 provided in a bearing part 39 integral with a support plate 38 supported by a column 37, and the casing 34 is supported with respect to the support plate 38. axis 41
Supported through.

Incidentally, an opening 18a is formed above the rotating cup 18, and a lower beak 45a of a crucible 45 storing molten metal with a high melting point is inserted through this opening 18a.

Further, a cylindrical frame 46 is installed in the center of the crucible 45 so as to pass through the entire vertical length of the crucible 45, and an electrode rod 47 is inserted through the center of the cylindrical frame 46.

This electrode rod 47 is connected to the electrode rod 9 and the rotating cup 1.
8, and a guide 43 is placed in the middle of the guide 43.
It is connected to a positive power source via a power supply terminal 44 having a structure similar to that of the power supply device 8 described above.

An inlet 46a for inert gas such as argon or helium is provided in the upper part of the cylinder frame 46, and the lower end of the cylinder frame 46 is open so that the inert gas can be directly supplied into the rotary cup 18. , the inside of the rotating cup 18 is filled with inert gas to prevent unnecessary consumption of the electrode rod and to prevent oxidation of the molten metal.

Next, the operation of this embodiment configured as above will be explained.

First, the motors 15 and 27 are started, and the cylindrical shaft 1
0 and the rotary cylinder 21 is rotated.

Cooling water is then supplied into the rotating cylinder 21 from the supply port 31a of the cooling water supply device 30.

Then, the cooling water filling the inside of the rotary cylinder 21 is guided into the cylinder body 33 fixed to the upper part of the rotary cylinder 21 through the opening 21b provided at the upper part of the rotary cylinder 21. When trying to fill the inside of the cylinder 33, since the cylinder 33 is rotating together with the rotating cylinder 21, the cooling water rises along the wall surface of the cylinder 33 due to centrifugal force.
It is ejected from the ejection port 33a toward the casing 34 side. At this time, the tip of the nozzle 20 of the rotary cup 18 is partially inserted into the cooling water guided to the spout 33a.

On the other hand, negative and positive currents are supplied to the electrode rods 1 and 47 via power supply terminals 8 and 44, respectively.

Therefore, an arc is generated between the electrode rod 1 and the replaceable electrode rod 9 attached to the upper end of the electrode rod 1, and the generated heat is supplied into the rotary cup 18 from the beak 45a of the crucible 45. Heats molten metal and keeps it warm.

Since the rotating cup 18 is rotating at a high speed, the molten metal is ejected in the form of particles into the cooling water from the nozzle 20 along the wall surface of the rotating cup 18.

Granular metal that comes into contact with cooling water is rapidly cooled,
The casing 34 with cooling water from the spout 33a
discharged inside.

Then, this granular metal falls into the product receiving box 35 from the discharge port 34a of the casing 34, and only the granular metal remains there, and the cooling water flows into the product receiving box 35.
is discharged to the water tank 36 side through a small hole in the bottom of the tank.

By the way, an arc is always generated inside the rotating cup 18, and the heat of this arc keeps the inside of the rotating cup 18 at a constant temperature, allowing long-time operation.

On the other hand, since the electrode rod 47 is sequentially consumed by the arc, a feeding device (not shown) is used to prevent the distance between it and the negative electrode rod 9 from changing. Adjustment is made so that there is always a constant distance between the electrode rod 9 on the negative side and the electrode rod 9 on the negative side.

Further, although inert gas is supplied into the rotary cup 18, the minus side electrode rod 9 also wears out, so the distance between it and the electrode rod 47, which is the upper electrode, also changes. Therefore, in this embodiment, the cylinder 5 provided at the lower end of the electrode rod 1 is operated, and the electrode rod 9 is adjusted according to the amount of consumption of the exhausted electrode rod 9.
The entire structure is raised to maintain a constant distance from the electrode rod 47, which is the upper electrode.

Note that the rotation directions of the cylindrical shaft 10 and the rotary cylinder 21 may be the same or opposite.

As is clear from the above explanation, according to the present invention, since a rotating cup is used, high speed rotation is not required as much as in a rotating electrode type, and the accuracy of the entire device does not need to be made that high. good.

Furthermore, an arc is generated within the rotating cup, and the heat of the arc can keep the ambient temperature within the rotating cup constant at all times, allowing continuous operation for a long time.

Furthermore, since inert gas is constantly supplied into the rotating cup, the molten metal is not oxidized and the electrodes are less worn out.

[Brief explanation of drawings]

The figure is a longitudinal side view illustrating an embodiment of the present invention. 1 is the upper electrode rod, 2 is the base frame, 5 is the cylinder,
6 is a bearing holder, 7 and 43 are guides, 8 is a power supply unit (minus side), 9 is a consumable electrode rod,
10 is a cylindrical shaft, 14 is a support base, 15 and 27 are motors, 18 is a rotary cup, 19 is a support body, 20 is a nozzle, 21 is a rotary cylinder, 22 and 26 are support bases, 30
33 is a cooling water supply device, 33 is a cylinder, 34 is a casing, 35 is a product receiving box, 36 is a water tank, 44 is a power supply unit (positive side), 45 is a crucible, 46 is a cylinder frame, 47 is an upper electrode rod.

Claims (1)

[Claims] 1. A lower electrode rod is installed in a freely rotatable cylindrical shaft so as to be movable up and down, and a rotating cup facing this electrode rod is fixed to the upper end of the cylindrical shaft. A cooling water supply device is provided in a rotary cylinder arranged concentrically outside the cylindrical shaft, and the tip of the nozzle provided in the rotary cup is cooled near the spout of the cylinder. The lower part of the crucible storing molten metal is inserted into the water, and the lower part of the crucible storing molten metal is inserted into the upper part of the rotating cup.A cylindrical frame is installed in the center of the crucible passing through the entire length of the crucible, and an upper part is placed in the center of the cylindrical frame. Insert the electrode rod,
The upper electrode rod is disposed with each tip facing the lower electrode rod in the rotating cup,
An apparatus for producing metal granules, characterized in that an inert gas is constantly supplied to a rotating cup.