JPH0227883Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mixing device for mixing cohesive powder without forming it into agglomerated particles.

[Conventional technology]

Generally, when mixing powders, a plurality of powders are placed in a stirring container and mixed by stirring. but,
In cohesive powders, powders tend to agglomerate together and form agglomerated parts, and once a powder has formed agglomerated parts, it is difficult to loosen it even if it is stirred and mixed with other powders. , it is not possible to obtain a powder mixture in which perfect powders are micro-mixed.

[Problem that the invention attempts to solve]

In view of the above circumstances, the present invention provides a cohesive powder mixing device that can obtain a micro-mixed powder mixture without producing agglomerated parts when cohesive powder is mixed with other powders. The purpose is to provide.

[Means for solving problems]

The present invention was made to achieve the above object, and includes a sieving machine into which the cohesive powder is introduced, a container that directly receives the cohesive powder sieved by the sieving machine, and a container for directly receiving the cohesive powder sieved by the sieving machine. A stirring blade that extends from the periphery of the opening along the inner wall of the container and whose tip reaches the center of the bottom of the container, and at least one of the stirring blade and the container is driven to move the stirring blade to the inner wall of the container. A cohesive powder mixing device is constituted by a driving means for relatively moving the container circumferentially along the container.

[Specific structure and function of the device]

The present invention will be explained below with reference to the drawings.

The drawing is a longitudinal cross-sectional view showing an embodiment of the cohesive powder mixing apparatus according to the present invention, and the reference numeral 1 in the drawing shows a sieve 2.
This is a sieve bar with attached. A bowl-shaped container 3 is provided below the sieve 2 of the sieving bar 1 to directly receive the sieved powder. This container 3 is attached to the upper surface of a rotating table 4 which is horizontally rotated by a motor (driving means) not shown. Furthermore, stirring blades 5 are arranged inside the container 3. The stirring blade 5 has a base (not shown) fixed, and a distal end thereof inserted into the container from the periphery of the opening of the container 3, with the leading end extending along the inner wall of the container 3. It has reached the center of the bottom.

In order to mix powders using the above-mentioned mixing device, first, a predetermined amount of powder A with no or low cohesiveness is mixed.
is placed in the container 3, and the turntable 4 is driven to rotate. The powder A in the container 3 is stirred by a stirring blade 5 whose base is fixed, and maintained in that state. Next, put a predetermined amount of cohesive powder B into the sieve 2 and pass through the sieve bar 1.
to drive. Through this operation, the powder B becomes a complete powder without any agglomerated parts, and falls directly into the container 3. The fallen powder B is immediately stirred with powder A to form a micro-mixed powder mixture (A+
B) is obtained.

In this powder mixture (A+B), the cohesive powder B is dispersed by the non-cohesive powder A, so the cohesiveness of the powder B is reduced and the agglomeration is prevented. do not have.

For example, gathrinium oxide (Gd ₂ O ₃ ), which has a high cohesion property, is replaced with uranium dioxide (UO ₂ ), which has a non-cohesion property.
When mixing with UO 2 , a micro-mixed powder of both can be obtained by placing UO ₂ in a container 3 and adding Gd ₂ O ₃ through a sieve 2 while stirring.

Moreover, in this embodiment, especially the stirring blade 5
is formed in a shape that extends from the periphery of the opening of the container 3 along the inner wall of the container, and the tip reaches the center of the bottom of the container 3, so that the powders A and B mixed in the container 3 are
is sufficiently stirred to every corner, and there are no stirring dead spots. Therefore, part of the powder B does not become agglomerated due to partial insufficient stirring, and the powder mixture (A) is uniformly micro-mixed throughout the interior of the container 3.
+B) is obtained.

In this embodiment, the container 3 is shaped like a bowl, but the present invention is not limited to this. For example, the container 3 may have a shape such as a cone or a rotating paraboloid that can be stirred to every corner by the stirring blades 5. If so, various modifications are possible.

Further, it is not always necessary to rotate the container 3, and the stirring blade 5 may be rotated around the axis of the container 3 while the container 3 is fixed. It is sufficient if it can be relatively moved in the direction.

Furthermore, in the above explanation, the mixing of two types of powder was described, but since the powder being stirred in the container 3 is not agglomerated, following powder B, other cohesive powders are passed through a sieve. By adding these, a micro-mixed multi-species mixed powder can be easily obtained.

In addition, in the above explanation, a powder with no cohesiveness or a low cohesiveness was mixed with a cohesive powder, but a powder with a certain degree of cohesiveness may also be mixed.
If the stirring state is maintained in the container, agglomeration is suppressed. Therefore, by maintaining the stirring state of the container 3 and sequentially introducing a plurality of relatively cohesive powders into the container through a sieve, a micro-mixed powder of only cohesive powders can be obtained. In this case as well, it is of course preferable to pass the powder through a sieve and put it into a container starting from a powder with low cohesiveness. However, the cohesiveness of the resulting mixed powder is relatively high, and agglomeration may occur if left in the air for a long time after stirring is stopped and then stirred again. It is desirable to perform the above operations consecutively.

[Effect of idea]

As mentioned above, the mixing device according to the present invention is
Powder is added directly from a sieve to a container that is stirred without stirring dead points, so highly cohesive powder can be mixed without agglomeration, resulting in micro-mixing. A complete powder with a uniform composition can be obtained.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of a cohesive powder mixing apparatus according to the present invention. 1... Sieving bar, 2... Sieve, 3... Container, 4...
Rotating table, 5... Stirring blades, A, B... Powder.

Claims (1)

[Scope of utility model registration request] A sieving machine into which the cohesive powder is introduced, a container that directly receives the cohesive powder sieved by the sieving machine, and a container extending from the opening periphery of the container along the inner wall of the container and having a tip A stirring blade that reaches the center of the bottom of the container, and a driving means that drives at least one of the stirring blade and the container to relatively move the stirring blade in the circumferential direction of the container along the inner wall of the container. A device for mixing cohesive powder.