JPH11333312A - Powder treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder treating device having excellent treating efficiency while effectively preventing the adherence of powder. SOLUTION: This powder treating device has a cylindrical body 1 having a treating chamber 1a consisting of an almost cylindrical inner peripheral surface F into which powder can be fed and freely rotatable around a first axial center J1 and a rotary blades 2 freely rotatable around a second axial center J2 inside the treating chamber 1a. The first axial center J1 and the second axial center J2 extend in the traverse direction. The inner peripheral surface F of the treating chamber 1a has a partial cylindrical surface F3 forming a part of a cylindrical surface having the first axial center J1 as the center thereof and a first surface F1 and a second surface F2 forming a projecting part 3 projecting to the partial cylindrical surface F3 on the first axial center J1 side. The head parts 2c of the rotary blades 2 are relatively rotated to the projecting part 3 from the first surface F1 side to the second surface F2 side. The partial cylindrical surface F3 and the first surface F1 are smoothly connected through a relaxation curved surface F4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing chamber having a substantially cylindrical inner peripheral surface into which powder can be charged, and a cylindrical body rotatable around a first axis, and an inside of the processing chamber. And a rotary blade rotatable about a second axis. Here, the powder treatment means a treatment such as pulverization, mechanical alloying, flattening, spheroidization, precision mixing, and compounding of single or plural kinds of particles. The term “composite” as used herein means to produce composite particles in which finer fine particles are bonded to the surface of a certain base particle.

[0002]

2. Description of the Related Art Conventionally, as a powder processing apparatus of this kind,
For example, there is a type of processing a powder by rotating a container into which a medium ball is charged, such as a rolling mill or a planetary mill.
When a powder processing apparatus in which these containers rotate is used, as the operation time becomes longer, the powder is gradually pushed out from the layer of the medium ball, and the powder is pressed and hardened on the inner wall of the container. An entire fixed layer is formed. In particular, 1
When processing a fine powder having a particle diameter of 0 μm or less, the powder adheres to the inner wall of the container or the surface of the ball, and further accumulates to cause segregation. Therefore, in a conventional powder processing apparatus, for example, in pulverization, a small amount of a lubricant such as stearic acid or alcohol is added to the powder to take measures to prevent sticking, or use a liquid medium such as water or alcohol. Submerged pulverization. This is because in the submerged pulverization, there is no sticking and segregation of the powder and each particle is sufficiently dispersed, so that the pulverization can be performed more finely than in the case of the dry type.

[0003]

However, in order to prevent impurities from being mixed into the powder, it is not desirable to add a lubricant such as stearic acid or alcohol as in the former case. Also, in many cases, it is necessary to recover the dried powder product in the end, so if the submerged pulverization is performed as in the latter, the obtained slurry must be filtered or dried. In this case, in addition to the problem that equipment and energy for the filtration and drying are required,
Another problem is that the fine powder is apt to agglomerate during drying. Furthermore, when the pulverization / mixing process in which mixing and pulverization are performed simultaneously is performed in a liquid, separation and segregation occurs in the drying stage due to a difference in specific gravity of the particles even if the mixture is uniformly mixed in the processing stage in the mill. there is a possibility. In addition, processing such as mechanical alloying, which combines or alloys metal particles, is not possible in liquids and must be performed in a dry manner.However, when processing soft metals such as aluminum, Problems such as an increase in the amount of fixation have occurred.

[0004] It is an object of the present invention to provide a powder processing apparatus which solves the above-mentioned drawbacks of the prior art and effectively prevents powder from sticking and has excellent processing efficiency.

[0005]

The features of the present invention for achieving this object will be described with reference to the examples shown in FIGS. [Configuration 1] In the powder processing apparatus of the present invention, the first axis J1 and the second axis J2 extend in the lateral direction, and the inner peripheral surface F of the processing chamber 1a is A partial cylindrical surface F3 forming a part of a cylindrical surface around the first axis J1.
And a first surface F1 and a second surface F forming a projection 3 protruding toward the first axis J1 with respect to the partial cylindrical surface F3.
Wherein the tip 2c of the rotary blade 2 rotates relative to the protrusion 3 from the first surface F1 side to the second surface F2 side, and the partial cylindrical surface It is characterized in that F3 and the first surface F1 are smoothly connected via a relaxed curved surface F4. [Operation and Effect] As in the present configuration, the first extending in the lateral direction
If a partial cylindrical surface and a protrusion are provided on the inner peripheral surface of the cylindrical body that rotates around the axis, and the partial cylindrical surface and the first surface of the protrusion are smoothly connected via a moderately curved surface. When the powder moves on the boundary between the partial cylindrical surface and the first surface, the moving direction can be smoothly changed. As described above, if the boundary portion is configured to have a smooth curved surface, in a region from the vicinity of the partial cylindrical surface to the vicinity of the first surface, a force based on the rotation of the rotating blade is used. The direction of the pressing force acting between the body particles changes continuously. As a result, the transmission of the pressing force and the like to the individual powder particles is reliably performed, and the powder is also reliably moved, so that the accumulation of the powder at the boundary can be prevented.

[Structure 2] In the powder processing apparatus of the present invention, as described in claim 2, the processing chamber 1a is used to pulverize, mechanically alloy, flatten, and precisely mix the powder.
When a plurality of medium balls B are thrown into the medium ball B, the curvature of the relaxed curved surface F4 when viewed in the direction along the first axis J1 can be set to be larger than the radius of the medium ball B. [Operation and Effect] In the powder processing apparatus of the present invention, it is possible to perform various types of processing of the powder using the media balls. In this case, as in this configuration, if the curvature of the relaxed surface is set to be larger than the radius of the medium ball using the curvature of the relaxed surface as viewed in the direction along the first axis, the medium ball will The contact can be surely made, and the accumulation of powder on the relaxed curved surface can be surely prevented.

[0007] In the description of the means for solving the above problems, reference is made to the drawings and, in order to facilitate comparison with the drawings, reference numerals are used, but the present invention is limited to the configuration shown in the accompanying drawings. Not something.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Outline) Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the powder processing apparatus of the present invention includes a cylinder 1 rotatable around a first axis J1 and a cylinder 1 rotatable around a second axis J2. It has the cylindrical body 1 and a rotatable blade 2 that can rotate relatively. The cylinder 1 has a processing chamber 1a having a substantially cylindrical inner peripheral surface F, into which various powders f to be processed are charged. Depending on the type of the powder f, a plurality of medium balls B for applying a pressing force or a shearing force to the powder f are also charged. Where powder f
Consists of one or more powders. The protrusions 3 are dispersedly arranged on the inner peripheral surface F of the cylindrical body 1.
The rotating blades 2 are rotated in the same direction as the cylindrical body 1 while slowly rotating the rotating blades 2. As a result, the powder f subjected to the pressing force, the shearing force, and the like by the rotating blades 2 and the protrusions 3 is subjected to the above-described powder treatment. In the powder processing apparatus of the present invention, the movement of the powder f and the medium ball B held between the two projections 3 adjacent in the circumferential direction X is restricted to a certain extent below the processing chamber 1a. . As a result, the powder f is not positively pressed against the inner peripheral surface F of the cylindrical body 1, and the adhesion of the powder f to the inner peripheral surface F is suppressed.

(Cylinder) As shown in FIG.
Has, for example, a substantially cylindrical inner peripheral surface F having a bottom 1b on one side. The cylindrical body 1 is configured to be rotatable in both forward and reverse directions around a first axis J1 extending in the lateral direction. A detachable side wall member 4 is attached to one side of the cylindrical body 1. That is, the bottom 1b and the side wall member 4 constitute a side wall of the processing chamber 1a. The loading and unloading of the medium ball B and the powder f into and from the processing chamber 1a are performed by removing the side wall member 4. Note that an opening 4a is provided in a part of the side wall member 4 so as to be freely opened by a detachment operation of the lid member 5. The powder f and the medium ball B can be charged and unloaded from the opening 4a.

As shown in FIG. 2, the inner peripheral surface F of the processing chamber 1a has a partial cylindrical surface F3 forming a part of a substantially cylindrical surface centered on the first axis J1 and a partial cylindrical surface F3. On the other hand, a first portion forming a projection 3 protruding toward the first shaft center J1 is formed.
It has a surface F1 and a second surface F2. Here, both the first surface F1 and the second surface F2 are configured to be substantially planar. The cylindrical body 1 is rotatable in any direction about the first axis J1. In the case of the present embodiment,
The rotation is performed so that the second surface F2 precedes the first surface F1. The first surface F1 is a surface for performing powder processing by pressing the powder f by the rotating blades 2 described later. In the apparatus of the present invention, as shown in FIG. 2, a boundary between the partial cylindrical surface F3 and the first surface F1 is provided for smoothly connecting the partial cylindrical surface F3 and the first surface F1. A relaxation curved surface F4 is provided. The relaxed curved surface F4
Is provided, the powder f and the medium ball B are rotated by the rotation of the rotary blade 2 or the rotation of the cylindrical body 1.
Moves smoothly in the vicinity of the boundary between the partial cylindrical surface F3 and the first surface F1. That is,
The change in the direction between the direction along the partial cylindrical surface F3 and the direction along the first surface F1 becomes gentle, and these surfaces F1, F1
3, the flow direction of the powder f and the medium ball B moving along F4 also changes continuously. Therefore, the respective powders f and the like move smoothly, and the accumulation of the powders f near the boundary between the partial cylindrical surface F3 and the first surface F1 is prevented.

When the medium ball B is used as in the present embodiment, the curvature of the relaxed curved surface F4 when viewed in the direction along the first axis J1 is set to be larger than the radius of the medium ball B. Keep it. According to this configuration, the medium ball B surely comes into contact with the relaxed curved surface F4, and the powder f adheres to the region between the partial cylindrical surface F3 and the first surface F1. It can be effectively prevented.

In this embodiment, the relaxed curved surface F4
The boundary between the first surface F1 and the partial cylindrical surface F3 when it is assumed that there is no
Assuming that a boundary portion between the second cylindrical portion F3 and the partial cylindrical surface F3 is a second boundary portion K2, a tangent to the partial cylindrical surface F3 at the first boundary portion K1 and the second boundary portion K2 when viewed in a direction along the first axis J1. The angle between the first surface F1 and the second surface F2 is set to about 30 degrees, and the angle between the tangent to the partial cylindrical surface F3 at the second boundary K2 and the second surface F2 is set to 45 degrees. In the present embodiment, such protrusions 3 are provided at four locations along the circumferential direction XX of the first shaft center J1.

As shown in FIG. 3, in the powder processing apparatus of the present invention, the inner peripheral surface F and both side walls, that is, the bottom portion 1b
Also, the boundary portions with the side walls W formed by the side wall members 4 are formed in a curved shape. Hereinafter, this portion is referred to as a curved surface corner F5. The curved surface corner F5 may be provided only at the boundary between the partial cylindrical surface F3 and the side wall W, for example.
A first surface F1 and a second surface F2 and a side wall W relating to the protrusion 3;
May be provided up to the boundary with. When the curved corner portion F5 is provided, for example, it can be formed by forging at the same time when the cylindrical body 1 is formed, or can be formed by overlay welding on the boundary portion. By providing such a curved corner F5, it is possible to prevent the powder f from sticking to the boundary between the inner peripheral surface F and the side wall W. That is, the width t of the rotating blade 2 in the direction parallel to the second axis J2 must be always smaller than the width T of the processing chamber 1a in the same direction, and the stirring force of the rotating blade 2 is The curved surface corner F5 tends to be smaller than the central portion of the inner peripheral surface F in a direction parallel to the core J2, and the powder f pressed against the portion is more likely to be pressed against the inner peripheral surface F. This is because it is easy to be deposited on the portion sandwiched between both the side wall W and the side wall W. Therefore, by providing the curved surface corner portion F5 as described above, the accumulation of the powder f is effectively prevented.

The cylinder 1 is formed using, for example, stainless steel. According to this configuration, the generation of rust on the inner peripheral surface F of the cylindrical body 1 can be suppressed, so that the entry of impurities into the powder f can be prevented.

(Rotating Blade) The rotating blade 2 is disposed in the processing chamber 1.
This is for agitating the powder f and the medium balls B charged into the processing chamber 1a inside the processing chamber 1a. As a result, the powders f or the media balls B are strongly rubbed against each other to apply a pressing force or a shearing force to the powders f to perform processing. The rotating blade 2 has four blade members 2a as shown in FIG. 1 or FIG. The blade member 2a
It is rotatable around a second axis J2 extending in the lateral direction. These blade members 2a are attached to a base 2b provided on the same axis as the second axis J2. As shown in FIGS. 2 and 3, the rotary blade 2 has its base 2 b
For example, it can be extrapolated to the blade shaft 6 protruding from the bottom 1b of the cylindrical body 1. The base portion 2b and the blade shaft 6 are fixed so as to be integrally rotatable using a fixing screw 7. The rotary blade 2 is formed using, for example, stainless steel. This prevents rust on the rotating blades 2 and prevents impurities from being mixed into the powder f.

The rotary blade 2 is rotated in the same direction as the cylindrical body 1. The rotation speed of the rotary blade 2 is
Set faster than the rotation speed. Accordingly, the tip 2c of the rotary blade 2 is relatively rotated with respect to the projection 3 from the side of the first surface F1 to the side of the second surface F2, so that the tip 2c and the first surface F1 By applying a pressing force or a shearing force to the powder f, the powder f is pulverized, mechanically alloyed, flattened, composited, spheroidized or precision mixed.

In the rotary blade 2 of the present invention, as shown in FIG. 2, the tip portion 2c, which is on the leading side in the rotational direction, has a curved shape when viewed in the direction along the second axis J2. A compression surface F6 is provided. Here, the compression surface F6 is formed in an approximately quarter arc shape. As shown in FIG. 2, when the rotary blade 2 rotates, the tip 2
A certain angle is provided between the rotation trajectory of the tip 2c and the first surface F1 so that the distance between the first surface F1 and the first surface F1 gradually decreases. With this configuration, the rotating blades 2
The effect of the tip 2c and the first face F1 ascending when rotating near the face F1 and the more powder f between the tip 2c and the first face F1 due to the compression face F6.
The pressing force and the shear force applied to the powder f are increased by the effect of inducing the powder f, and the powder processing ability is improved.

The diameter of the rotary blade 2 is equal to its tip 2c.
Is closest to the protrusion 3, the protrusion 3
Are set so that a predetermined separation distance can be ensured between them.
For example, as shown in FIG. 2, in the present embodiment, the third boundary portion K3 is closest to the trajectory 8 of the tip of the rotary blade 2 in the protrusion 3. Here, the distance between the trajectory 8 formed by the tip 2c and the trajectory 9 formed by the third boundary K3 is at least three times the diameter of the medium ball B. When the medium ball B is not used, it is set to at least three times the maximum particle diameter. With such a setting, it is possible to prevent the medium ball B or coarse particles from being caught and clogged between the tip of the rotary blade 2 and the third boundary portion K3, so that the rotary blade 2 can smoothly move. Rotation can be maintained. In the case of the shape, the effect particularly when the powder f is compounded becomes remarkable. Here, the term “composite” refers to, for example, a treatment for attaching and integrating fine particles on the surface of the base particles. Further, if the powder processing apparatus is used, it is possible to perform mechanical alloying in which a plurality of metal particles are pressed together to form, for example, a titanium-nickel alloy.

(Rotary Driving Apparatus) As shown in FIG. 3, for example, the cylindrical body 1 and the rotary blade 2 are driven and rotated in the same direction by using a first motor M1 and a second motor M2, respectively. For example, the first motor M1 is connected to the bottom 1 of the cylindrical body 1.
b drives the drive gear 11 provided at the end of the cylindrical shaft 10 extending outward from the cylindrical shaft 10. One of the second motors M 2 is provided inside the cylindrical shaft 10. 1
0 and directly connected to a blade shaft 6 which is provided so as to be relatively rotatable. The first motor M1 and the second motor M
The rotation speed and the rotation direction of 2 can be appropriately set by the control device.

(Medium Ball) The medium ball B is put into the processing chamber 1a together with the powder f, and is agitated and rolled by the rotating blades 2 to apply a pressing force, a shearing force and the like to the powder f. To process the powder f. The medium ball B has abrasion resistance or corrosion resistance, for example, zirconia-based, in order to prevent impurities from being mixed into the powder f by mixing a part of the medium ball B into the powder f. It is configured using stainless steel or the like. Into the processing chamber 1a, the medium balls B and the powder f are charged in an amount corresponding to about 1/4 to 2/3 of the volume of the processing chamber 1a. The input amount is appropriately changed according to the characteristics of the powder f to be processed or the size of the medium ball B itself. The diameter of the medium ball B is usually about 3 to 5 mm.

(Operation Procedure) FIG. 4 shows how the powder f is processed by the powder processing apparatus of the present invention. In the present embodiment, the rotation of the rotary blades 2 is mainly intended to agitate the powder f and the medium balls B, and the rotation of the cylinder 1 is mainly performed when the powder f is the inner circumference of the cylinder 1. The purpose is to prevent segregation from occurring due to sticking to the surface F. In the present embodiment, the rotation speed of the rotary blade 2 is increased with respect to the rotation speed of the cylindrical body 1, and a compressive / shearing force is applied to the powder f between the rotary blade 2 and the protrusion 3. The rotation speed of the cylindrical body 1 is set to about 1 to 10 rpm, and the rotation speed of the rotary blade 2 is set to about 100 to 500 rpm.

The effect of compressing / shearing the powder f is remarkably exerted in a region between the vicinity of the compression surface F6 provided at the tip 2c and the vicinity of the third boundary K3 of the projection 3. You. In other words, the stirring effect of the rotating blades 2 depends on the rotation speed of the rotating blades 2. Therefore, as the rotation speed increases, the stirring effect increases, and the powder processing effect increases. Since the rotation speed of the rotary blade 2 is higher than the rotation speed of the cylindrical body 1, the powder f in the region between the compression surface F6 and the third boundary portion K3.
The shear force positively acts between the media balls B and each other, and the powder f is effectively treated. As shown in FIG. 4A, the distance between the tip 2c and the first surface F1 decreases as the tip 2c approaches the third boundary K3.
In this area, a pressing force is generated between the powder f and the medium balls B, and the powder f is also compressed and sheared by the pressing force.

On the other hand, the effect of the powder treatment is as follows.
The distance decreases from the locus 7 of c. In particular, the cylinder 1
In the vicinity of the partial cylindrical surface F3, the movement of the powder f and the medium ball B is prevented when the relevant portion passes below the first axis J1 as shown in FIG. In this state, the powder f and the medium ball B are stabilized between the adjacent protrusions 3 by gravity. For this reason, the powder f is not extruded or pressed against the partial cylindrical surface F3 of the cylindrical body 1, and segregation due to the powder f sticking to the partial cylindrical surface F3 is suppressed.

The powder f having been subjected to the intended treatment can be taken out through the opening 4a by opening the lid member 5 attached to the side wall member 4. Further, if the side wall member 4 is removed, the processed powder f can be completely removed.

(Effects) As described above, with the powder processing apparatus of the present invention, the powder f and the entire medium ball B are circulated by the rotation of the cylindrical body 1 and locally in the vicinity of the rotating blades. Since a strong stirring action can be given to the powder f and the medium balls B, the adhesion and segregation of the powder f to the inner peripheral surface 1b can be reduced. Further, the distance between the compression surface F6 and the first surface F1 becomes narrower as the rotary blade 2 rotates and the compression surface F6 comes closer to the third boundary portion K3, and moreover, the distance between the partial cylindrical surface F3 and the first surface F1 becomes smaller. Between the first surface F1 and the first surface F1, there is provided a relaxation curved surface F4 for smoothly connecting both surfaces, so that the powder f and the medium ball B are rotated by the rotation of the rotary blade 2 or the cylindrical body 1.
When the fluid flows near the boundary between the partial cylindrical surface F3 and the first surface F1, the rate of change in the flowing direction becomes gentle. That is, since the change between the moving direction along the partial cylindrical surface F3 and the moving direction along the first surface F1 is made gently, the movement of the powder f and the like becomes smooth. As a result, the amount of the powder f fixed near the boundary between the partial cylindrical surface F3 and the first surface F1 is extremely small.

(Another Embodiment) <1> In the above embodiment, the shape of the distal end portion 2c is approximately one-fourth when viewed from the direction along the second axis J2.
It was formed in an arc shape. However, the present invention is not limited to this configuration, and as shown in FIG. 5, the shape when viewed in the same direction can be configured as a rectangular shape. This configuration is a medium ball B
Is particularly effective when processing such as pulverization, mechanical alloying, flattening, and precision mixing is performed. With this configuration, the media ball B and the powder f near the entire surface of the rotary blade 2 are accelerated by the stirring action of the rotary blade 2, and are relatively positioned between the medium ball B and the powder f at a farther position. Due to the speed difference, a shear force is generated. In addition, according to the rotation speed of the rotary blade 2, a centrifugal force is applied to the accelerated medium ball B and the powder f in a radial direction toward the circumferential surface. Further, when the medium ball B and the powder f are below, gravity acts in a radial direction toward the circumferential surface. These radial forces become appropriate compressive forces, and together with the shearing force, give the powder f a desired treatment hardening. And
In the shape of the rotary blade 2, there is no action of forcibly pushing the media ball B directly outward, so that the media ball B is not pressed more than necessary, so that the media ball B is located between the tip of the rotary blade 2 and the third boundary portion K 3. There is no problem such that smooth rotation is hindered by the biting and the medium ball B is broken.

<2> Also, as shown in FIG. 6, the shape of the tip 2c as viewed in the direction along the second axis J2 is the same as that shown in <1> above, even if it is formed in an edge shape. The effect of is obtained. In this case, the surface 2e on the side preceding the rotation is made flat, and the edge-shaped rotary blade 2 is formed by providing a tapered surface 2f on the back side.

<3> In the above embodiment, the shape of the rotary blade 2 is constituted by a substantially plate-shaped member. However, as shown in FIGS. 7A and 7B, a columnar member 2g or a cylindrical member 2g is provided around the base 2b. It may be configured by attaching a plurality of elliptical columnar members 2h. In this configuration, the medium ball B is not generally used, but the medium ball B may be used when the distance between the members 2g and 2h and the protrusion 3 is sufficiently maintained. For example, in the case of FIG. 7A, the axis J3 of the columnar member 2g is set substantially parallel to the second axis J2. That is, a pressing force or the like is applied to the powder f and the medium ball B by using the side surface and the outer surface on the rotation direction front side of the cylindrical member 2g. With this configuration, even if the powder f is in front of each of the columnar members 2g, among the regions through which the columnar members 2g pass, those located inside the rotation radius of the columnar member 2g are not included. The next columnar member 2g and the first surface F1 are easily passed before the next columnar member 2g rotates by the centrifugal force acting on the powder f by passing through the inside of the columnar member 2g. During this time, the powder f flows. As described above, in the configuration according to the present embodiment, the powder f or the like is positively
And the first surface F1 can be guided to improve the pressing effect of the powder f and the like, which is particularly effective when the powder f is spheroidized, compounded, and precisely mixed. Further, according to this alternative embodiment, the powder f near the base portion 2b can escape to the rear of the rotary blade 2, so that the rotational load of the rotary blade 2 is reduced. Therefore, advantages such as a compact drive device for the rotary blade 2 can be obtained.

<4> In order to improve the pressing force acting on the powder f, the rotary blade 2 may be configured as shown in FIG. That is, the shape of the blade member 2a as viewed in the direction along the second axis J2 is substantially trapezoidal. Specifically, the tip 2c is formed in a substantially arc shape, and an inclined surface 2j is provided from the tip 2c to the front side of the blade member 2a. The inclined surface 2j is inclined by, for example, about 45 degrees with respect to the radial direction Z of the blade member 2a. The inclined surface 2j is used to transfer the powder f, the medium ball B, etc. to the first surface F1.
And presses the powder f in advance as an auxiliary compression section. Further, in the case of the blade member 2a of the present configuration, similarly to the above-described another embodiment <3>, the powder f present inside the blade member 2a is rotated by the blade member 2a rotating following the blade member 2a. And the first surface F1 can be made to flow positively, so that the pressing effect of the powder f can be further improved. As described above, by using the rotating blades 2 according to the present embodiment, combined with the effect of the relaxed curved surface F4, the compounding or spheroidizing of the powder particles is achieved.
Can promote precision mixing.

<5> In the above embodiment, the first axis J
1 and the second axis J2 are provided on the same axis, but as shown in FIG. 9, both axes J1 and J2 may be provided at different positions. For example, in that case, a third boundary portion K formed on the protrusion 3 in the trajectory 8 of the tip 2c.
The position 12 closest to the locus 9 (hereinafter, referred to as the “closest position 12”) is rotated about 45 degrees from the lowermost position of the locus 8 toward the lower rotation side about the second axis J2. Set so that it is the position you set. That is, the second axis J2 of the rotary blade 2 is displaced 45 degrees downward from the position of the first axis J1 of the cylindrical body 1. With this configuration, the effect of pressing the powder f and the like by the rotary blades 2 is extremely good. That is, as the rotary blade 2 approaches the closest position 12, the pressing force acting on the powder f and the medium ball B increases. In this case, since gravity acts on the powder f or the like, the powder f or the like does not easily move upward from the closest position 12. Trying to stay nearby. As a result, the pressing force or the shearing force acting on the powder f becomes maximum at the position, and the processing efficiency of the powder f is improved.

<7> In the above-described embodiment, an example has been described in which the cylindrical body 1 and the rotary blade 2 are independently driven using the first motor M1 and the second motor M2, but a single motor is used. A configuration may be used in which either the cylindrical body 1 or the rotary blade 2 is rotated via a transmission. With this configuration, it is possible to obtain a powder processing apparatus and a powder processing apparatus whose operation is simple.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an outline of a powder processing apparatus according to the present invention.

FIG. 2 is a front sectional view of the powder processing apparatus.

FIG. 3 is a side sectional view of the powder processing apparatus.

FIG. 4 is an explanatory view showing a rolling state of a medium ball.

FIG. 5 is an explanatory view showing a rotating blade according to another embodiment.

FIG. 6 is an explanatory view showing a rotating blade according to another embodiment.

FIG. 7 is an explanatory view showing a rotating blade according to another embodiment.

FIG. 8 is an explanatory view showing a rotating blade according to another embodiment.

FIG. 9 is a front sectional view of a powder processing apparatus according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 1a Processing chamber 2c Tip part 2 Rotating blade 3 Protruding part B Medium ball F Inner peripheral surface F1 First surface F2 Second surface F3 Partial cylindrical surface F4 Relaxed curved surface J1 First axis J2 Second axis

Claims (2)

[Claims] 1. A processing chamber having a substantially cylindrical inner peripheral surface into which powder can be charged, a cylindrical body rotatable about a first axis, and a second chamber center inside the processing chamber. A powder processing apparatus having rotating blades rotatable on the first axis, wherein the first axis and the second axis extend in a lateral direction, and an inner peripheral surface of the processing chamber is the first axis. A partial cylindrical surface that forms a part of a cylindrical surface centered on the core; and a first surface and a second surface that form a protrusion protruding from the partial cylindrical surface toward the first axis. The tip of the rotary blade is relatively rotated with respect to the projection from the first surface side to the second surface side, and the partial cylindrical surface and the first surface are relaxed. A powder processing device that is smoothly connected via a curved surface. 2. A method according to claim 1, wherein a plurality of media balls are introduced into the processing chamber to process the powder, wherein a curvature of the relaxed curved surface when viewed in a direction along the first axis is equal to or smaller than a radius of the media balls. 2. The powder processing apparatus according to claim 1, wherein the setting is larger than the radius.