JPH03238056A - Powder treatment apparatus - Google Patents

Abstract

PURPOSE:To well treat a powder by providing a driving device rotating a material to be treated at high speed so as to press the same to the inner peripheral surface of a casing and constituting the interior of the casing in an airtight state. CONSTITUTION:A casing 4 and a vacuum pump 7 are connected by a connection pipe 21a and the casing 4 can be held in a vacuum state by the action of the vacuum pump 7. A housing 6 is formed into a divided structure and the casing 4 is also formed into a divided structure and a treated material can be recovered from the casing in such a state that a part of the housing 6 and a lid part 4c are detached. A support 8b is mounted to the upper end part of the support shaft 8a allowed to pierce through a rotary shaft 2 and the conical part 8c formed to the support 8b is arranged in coaxial relation to a pipe 11. The scraping piece 9a shearing a material to be treated by the cooperation with the inner peripheral surface 4a of the casing 4 is arranged in a grinding chamber 3. By this constitution, general-purpose properties are enhanced.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a rotatable casing forming a grinding chamber, and a material to be treated inside the casing is pressed against the inner circumferential surface of the casing by centrifugal force. The present invention relates to a powder processing apparatus which is provided with a drive device that rotates at a high speed so as to rotate at a high speed, and in which a grinding piece and a scraping piece are provided in the casing so as to be rotatable relative to the inner circumferential surface of the casing.

(Prior Art) Conventionally, the powder processing apparatus described above has been configured to maintain the inside of the casing in an atmospheric atmosphere or an inert gas atmosphere.

(Problem to be Solved by the Invention) However, when the material to be treated is susceptible to the adverse effects of active gases such as 02 or inert gases such as N2, or when degassing is required, the above-mentioned conventional powder Processing equipment could not be applied, and there was room for improvement in terms of versatility.

In other words, when you want to treat extremely easily oxidized metals such as Na, Mg, CaXZn, and Cd with high purity, removing hydrogen and oxygen from metals such as steel and stainless steel will eliminate white spots, hair cracking, and non-metallic metals. When removing defects such as grain boundary extraction of inclusions, etc., it has not been possible to utilize the effective characteristics of the powder processing apparatus described above.

The purpose of the present invention is to enable good powder processing even if the material to be treated is easily affected by various gases or requires degassing. , it is possible to sufficiently expand the applications of powder processing equipment.

(Means for Solving the Problems) The characteristic configuration of the present invention is to airtightly construct the inside of the casing in which the material to be treated, which is pressed against the inner peripheral surface of the casing through straw-speed rotation, is treated using friction pieces and scraping pieces. In addition, a vacuum pump is connected to the casing, and its effects are as follows.

(Function) Connect the casing to a vacuum pump to create a vacuum inside the casing (e.g. 30 Torr to 10-' Torr)
Even if the material to be treated is easily affected by active gases such as 02 or inert gases such as N2, or requires degassing, the friction piece can Various powder treatments such as fine pulverization, mixing, coating, coating by particle surface fusion, production of composite particles, etc. by the action of scraping pieces can be successfully carried out.

To give a concrete example, the following (a) to (a) which could not be achieved in the past
The powder processing described in item c) can be carried out well.

(a) Fine powder of easily oxidized metals such as Nas Mgs Cas Zn1Cd can be reliably obtained with high purity.

(l)) Modification of steel and stainless steel by degassing, such as removing white spots, hair cracking, and non-metallic inclusions by removing N2 and 02, preventing cracking and corrosion by removing carbon from grain boundaries, and by degassing. Mechanical properties can be sufficiently improved.

(c) In the production of alloys containing iron and chromium, such as stainless steel, it is possible to remove carbon with inexpensive materials to obtain high-quality alloys, without using expensive materials with low carbon content, improving productivity and reducing costs. Can be sufficiently down.

In particular, in the case of degassing as described in items (b) and (c) above, since the material to be treated is in the form of fine powder, degassing can be achieved extremely effectively.

(Effect of the invention) As a result, various powder treatments such as pulverization, mixing, coating, coating by particle surface fusion, and production of composite particles,
Even if the material to be treated is adversely affected by various gases or requires degassing, it is now possible to provide a powder processing apparatus that is even more superior in terms of versatility.

(Example) Next, an example will be shown with reference to FIGS. 1 and 2.

A bottomed cylindrical casing (4) forming a grinding chamber (3) is concentrically attached to the upper end of a vertical rotating shaft (2) attached to a base (1), and an electric motor (5a) and transmission (5
The drive bag M (5) consisting of b) etc. is linked to the ↑ end of the rotating shaft (2), and the casing (4) is moved so that the material to be treated inside the casing (4) is pressed against the inner peripheral surface (4a) of the casing by centrifugal force. The casing (4
) is arranged so that its rotation speed can be adjusted.

A path (lla) for supplying the material to be treated into the casing (4)
), feeders (12a), (12b),
(12c) is connected via a rotary feeder (13) shaped to maintain airtightness, and the pipe (11)
is provided with a connector (22), and the casing (4) and vacuum pump (7) are connected by a connecting pipe (21a). In addition, the same airtight means (10
b) to make the inside of the casing (4) airtight.

That is, the inside of the casing (4) is maintained in a vacuum state of, for example, 30 Torr to 1 O-5 Torr, preferably about 5 x 1 O-s Torr, by the action of the vacuum pump (7), and powder processing and degassing are performed in a vacuum state. It is designed to be able to carry out accompanying powder processing.

The housing (6) is divided into left and right parts so that it can be removed, and the casing (4) has a lid part (4c).
) has a split structure so that it can be separated and removed, and is removably connected to the casing body (4b) with bolts, and with part of the housing (6) and lid part (4c) removed, the casing ( 4) It is designed to allow collection of processed materials from within.

A jacket (14) is provided around the housing (6), through which the heating or cooling medium from the tank (15) passes, and an air inlet (18) is provided below the housing (6). , an exhaust port (19) is provided above, a wind turbine (26) is connected to the exhaust port (19), and an air passage (20) is formed on the outer periphery of the casing (4) to allow the introduced air to pass through the casing. (4) is arranged to be heated or cooled.

A support (8b) is attached to the upper end of a support shaft (8a) that passes through the rotating shaft (2), and a conical portion (8c) shaped like the support (8b) in the casing (4) is attached. pipe(
A grinding piece (9a) which is arranged concentrically with the casing inner peripheral surface (4a) and compresses and shears the material to be treated, and a scraping piece (9a) which stirs, mixes and disperses the material to be treated. 9b),
The casings (4) are attached to the tip of the support (8b) and placed in the grinding chamber (3) in a state where they are lined up at appropriate intervals in the rotational direction.

The grinding piece (9a) has an inclined surface shaped so that the gap with the casing (4) becomes narrower in the direction of rotation of the casing (4), and the scraping piece (9b) is attached to the casing (4). The clearance between the casing (4) and the grinding pieces is wide on the side in the direction of rotation of the casing (4), and the working surface is wedge-shaped or comb-shaped, with the width gradually becoming wider. (9a) and the scraping piece (9b) are rotated relative to each other, and the material to be processed is pulverized by the grinding piece (9a) and stirred and mixed by the scraping piece (9b), which is pressed against the inner circumferential surface of the casing (4a). It is designed to be carried out against

A passage (16) is formed in the support shaft (8a) to allow a heating or cooling medium to flow into the support (8b), the grinding piece (9a), and the scraping piece (9b), and a rotary joint (17) is formed.
A passageway (16) is connected to a media storage tank (15) by a channel (16).

In short, the casing (4) is rotated at high speed and the material to be treated is pressed against the inner peripheral surface (4a) of the casing by centrifugal force.
The casing (4) is placed on the layer of the treated material that has been shaped by the pressing
The grinding piece (9a) and the scraping piece (9b) rotate relative to each other.
), the material to be treated is pulverized with the grinding piece (9a) and stirred and mixed with the scraping piece (9b), so as to obtain a finely pulverized material that is sufficiently fine and evenly mixed. The inside of the casing (4) is maintained in a vacuum state by the action of a vacuum pump (7).

(Another example) Next, another embodiment will be described.

The specific configuration of the powder processing apparatus can be changed as appropriate, and for example, the following formats are possible.

(a) Turn the rotation axis of the casing (4) sideways,
Tilt around A.

(U) The grinding pieces (9a) and the scraping pieces (9b) are urged by fluid pressure or a spring to the extent that they do not come into contact with the casing (4) side.

(c) Appropriately change the shape, material, number, etc. of the grinding pieces (9a) and scraping pieces (9b).

(d) Instead of attaching a connector (22) and a connecting pipe (21a) to the supply route (lla), an intake port (23) and a valve (25) are installed in a part of the lid part (4c) of the casing (4). ),
Connect to the connecting pipe (21b) of the vacuum pump (7) when necessary,
The casing (4) may be configured to be removed at the time of M rotation after the inside of the casing (4) is brought into a predetermined vacuum state.

(e) Fix the support body (8b), form an intake hole (24) in a part of the conical part (8c), and insert the connecting pipe (21c) into the casing (4) through the passageway (16). may be brought into a predetermined vacuum state.

In this case, the supply of heating or cooling medium to the grinding pieces (9a) and the scraping pieces (9b) is stopped, but the casing (4
) can be sufficiently heated or cooled by applying a heat source from the jacket (14) on the housing (6) side through the introduced air.

Further, when the intake hole (24) is not used, the opening is closed with a screw (27).

The type and purpose of the material to be treated are not limited; for example, materials that are made of one or more types of powder or granules of metals or ceramics can be used.

Incidentally, although reference numerals are written in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a conceptual diagram, and FIG. 2 is a view taken along the line ■-■ in FIG. 1. (3)...Friction chamber, (4>...Casing, (4a)...Inner peripheral surface of casing, (5)
......Drive device, (6)...Housing, (7)...Vacuum pump, (9a>...
-Friction piece, (9b)... scraping piece. that's all

Claims (1)

[Claims] A casing (4) forming a grinding chamber (3) is rotatably provided, and the casing (4) is rotated at high speed so that the material to be treated inside the casing (4) is pressed against the inner circumferential surface (4a) of the casing by centrifugal force. A powder processing apparatus including a drive device (5) and a grinding piece (9a) and a scraping piece (9b) provided in the casing (4) so as to be rotatable relative to the inner circumferential surface (4a) of the casing. In the powder processing apparatus, the inside of the casing (4) is configured to be airtight, and a vacuum pump (7) is connected to the casing (4).