JPH051052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a powder mixing device that receives two or more different types of raw material powder, mixes them, and discharges a mixed powder.

[Prior Art] Conventionally, rotary mixers have been widely used as powder mixing devices. The structure and operation of a rotary mixer will be explained based on a conventional example shown in FIGS. 6A to 6C. FIG. 6A is a sectional view showing a state in which raw material powder is introduced into the rotary mixer. In the figure, numeral 1 is the container body, 2 is the opening, and 3 is the raw material powder. The container body 1 includes a bottom portion 4, a cylindrical portion 5,
Conical part 6 and fins 7a, 7b, 7c vertically provided inside the cylindrical part 6 at 90 degree intervals along the direction of the central axis.
It is composed of: The raw material powder 3 is introduced from the opening 2 in the direction indicated by the arrow in the figure, and is stored in the lower part of the container body 1.

FIG. 6B is a sectional view showing a state in which the rotary mixer is mixing the raw material powder 3. The central axis 8 of the rotary mixer maintains a constant inclination angle A with respect to the vertical line 9, and the rotary mixer rotates around the central axis 8. The raw material powder 3 is stirred and mixed by this rotational movement, but the stirring and mixing of the raw material powder 3 is
This is effectively done by a, 7b, and 7c. In this state, the surface 10 of the raw material powder 3 is the horizontal surface 1
It forms an approximately constant angle B with respect to 1. This angle B is called the angle of repose of the powder, and the angle B is the central axis 8
It is a constant that does not depend on the inclination angle A of , but only on the characteristics of the raw material powder 3.

The angle of repose is the maximum angle that the slope of a pile of powder forms with respect to a horizontal plane. Since the slope of the piled powder collapses under its own weight, it does not form an angle greater than the angle of repose with respect to the horizontal plane.

FIG. 6C is a sectional view showing a state in which the mixed powder obtained by the stirring and mixing described above is discharged. The container body 1 is held in an inclined state with the opening 2 facing downward, and is rotated to discharge the mixed powder.

If more mixed powder is required than can be obtained in one mixing, the operations shown in FIGS. 6A to 6C described above are repeated.

[Problems to be Solved by the Invention] By the way, since the above-mentioned rotary mixer discharges the mixed powder intermittently, other devices that perform related work have waiting time, resulting in inefficient work. I had a problem with that. In addition, when mixing nuclear fuel powder, the rotary mixer mentioned above is regulated so that the inner diameter of the container body is within a certain limit from a safety perspective. The problem was that the amount of mixed powder decreased, making the work even more inefficient.

The problem of this invention is how to realize a powder mixing device that is capable of continuously mixing and discharging powders, and that allows the inner diameter of the container to be reduced.

[Means for solving the problem] This invention accepts two or more types of raw material powder,
In a powder mixing device that mixes these and discharges a mixed powder, the above problem is solved by making the powder mixing device a continuous powder mixing device equipped with the following a, b, and c. There is.

a (a) a cylindrical container body with a bulging middle part, narrowing at both ends, and opening at both ends; (b) oystering fins provided on the inner surface of the container body;
A plurality of single stirring vessels consisting of are connected coaxially, and the direction of the central axis of the connected stirring vessels is inclined so that one end thereof is higher than the other end, and further, the stirring vessel is The main body of the mixing device is configured to be rotatable around its central axis.

b A raw material powder inlet provided at the upper end of the mixing device main body.

c A mixed powder outlet provided at the lower end of the mixing device main body.

[Embodiment] FIGS. 1 to 5 are diagrams showing an embodiment of the present invention.

FIG. 1 is a side view of this embodiment, with reference numeral 2.
0 is the main body of the mixing device, 21 is a raw material powder inlet, and 22 is a mixed powder outlet. The mixing device main body 20 includes (a) a container body 2 having an abacus bead shape and opening at both ends;
3 and (b) 90 along the axial direction on the inner surface of the container body 23.
Kakiage fins 24a, 24 provided for each degree
Single stirring vessel 25, 2 consisting of b, 24c, and
6 and 27 are connected in the axial direction. Further, both ends of the mixing device main body 20 are rotatably supported by supports 28 and 29.
The raw material powder input port 21 has a raw material powder input chute 30.
is inserted, and a receiving tray 31 is arranged adjacently below the mixed powder outlet 22.

FIG. 2 is a sectional view showing the inside of the stirring container 25. As shown in FIG. Flat-shaped kakiage fins 24a, 24
b, 24c, and 24d are vertically provided on the inner surface of the container body 23 at intervals of 90 degrees along the axial direction.

When mixing powders, as shown in FIG.
The mixing device main body 20 is rotated around its central axis. The raw material powder is first stirred in the stirring container 25 by the rotational movement of the mixing device main body 20.
At that time, the kakiage fin 24a,
Stirring and mixing are promoted by 24b and 24c. The powder remains inside the stirring container 25 for a certain period of time and is stirred and mixed, but the effect of the angle of repose mentioned above and the oyster fin 24a, which will be explained below, are
Due to the effects of 24b and 24c, the exit 32 gradually
and transferred into the adjacent stirring vessel unit 26. The powder transferred to the single stirring container 26 remains there for a certain period of time and is stirred and mixed as in the single stirring container 25, so that the powder is more uniformly stirred, but it is gradually discharged from the outlet 33. Next, it is transferred into the adjacent stirring vessel unit 27. The powder is subsequently stirred and mixed in the same manner to obtain a uniform mixed powder. Finally, as above, the mixed powder is determined by the angle of repose and the kakiage fins 24a, 24b, 2
4c, the mixed powder is discharged from the mixed powder outlet 22 to the receiving tray 31.

Here, within the stirring containers 25, 26, 27,
The action of the kakiage fins 24a, 24b, and 24c in the process of stirring, mixing, and discharging the powder will be explained based on FIGS. 3, 4A to 4B, and 5A to 5B.

FIG. 3 is a sectional view of a single stirring container 25,
In the figure, reference numeral 23 indicates the container body, 24a, 24
b, 24c are kakiage fins, 21 is a raw material powder inlet, and 32 is an outlet. Plane C is a plane that touches the lower end of the outlet 32 and makes an angle of repose E with the horizontal planes D, D, and plane F is a plane that touches the lower end of the mixed powder inlet 21 and makes an angle of repose E with the horizontal planes D and D. When powder is put into the stirring container 25, the powder located below the planes C and F (powder in the hatched area in the figure) stays in the stirring container 25. Conversely, the powder piled up above the plane C or the plane F flows out from the outlet 32 or the raw powder inlet 21 in the process in which the surface of the powder forms the angle of repose E. The powder remaining in the stirring container 25 is stirred and mixed by the stirring container 25 rotating around the central axis.

4A and 4B are cross-sectional views showing how the powder is stirred by the stir-fry fins 24a and gradually conveyed toward the outlet 32 during the stirring and mixing process.

The powder located at point Ga in Figure 4A is
As the stirring vessel unit 25 rotates, the stir-frying fin 24a stirs the fish, and moves together with the stir-fry fin 24a until the angle between the stir-fry fin 24a and the horizontal plane becomes a certain angle.

FIG. 4B shows the kakiage fin 24 as described above.
It is a side view which shows the state in which a has rotated by a fixed angle. At this point, the powder slides from point Gb to point H on the inner edge 34 of the frying fin 24a, and from there it falls under its own weight.

5A to 5B are diagrams showing the movement of the powder described above as seen from the side of the stirring container 25, and FIG. 5A is similar to FIG. 4A, and FIG. 5B is similar to FIG. 4. Each corresponds to B.

As shown in FIG. 5A, the powder located at point Ga is scraped upward by the scraping fin 24a.

Next, as shown in FIG. 5B, the powder slides from point Gb to H, and falls from point H under its own weight. The powder that falls from point H under its own weight falls vertically as shown by the solid arrow in the figure, but at this time, the central axis 35 of the stirring container 25 forms an angle I with the horizontal plane D. Because of the inclination, the powder falling point J is closer to the exit 32 than the point Gb. The powder that has fallen to point J is again scraped up by one of the scraping fins, and when the angle that the scraping fin makes with the horizontal plane D reaches the above-mentioned certain angle, it slides down. By repeating the above movement, the powder is gradually conveyed towards the outlet 32,
It is discharged from the outlet 32.

In addition, in FIG. 1, when the mixing device main body 20 continues to rotate after the input of raw material flour from the raw material flour input port 21 is stopped, the raw material flour is transferred to the kakiage fins 24a, 24b as described above. ，
24c, and are sequentially conveyed toward the exit, and all are discharged from the mixed powder discharge port 22.

As explained above, when powders are mixed using the continuous powder mixing device of this embodiment,
The following effects (1) to (4) can be obtained.

(1) Continuous input of raw material powder, continuous mixing, and continuous discharge of mixed powder are possible, so there is no waiting time for other equipment, improving work efficiency.

(2) Continuous operation improves the powder mixing capacity per unit time, so there is no need to increase the diameter of the mixing device itself, and therefore the inner diameter of the container is limited within a certain limit. Powder mixing can also be done efficiently.

(3) Because the raw material powder remains inside each stirring container for a certain period of time and is stirred and mixed, even if there is variation over time in the supply amount of different raw material powders, the mixed powder has a stable composition. can be obtained.

(4) At the end of the mixing operation, all mixed powder is discharged by rotating the mixing device for a while after stopping the input of raw material powder, so there is no need to remove the mixed powder or the inside of the mixing device. Does not require cleaning.

In this example, the shape of the stirring vessel body was made into an abacus bead shape, but the shape of the stirring vessel body may be such that the middle part is swollen, both ends are narrowed, and both ends are open. It may be in the shape of a barrel.

In addition, in this example, the fins for frying were provided on the inner surface of the container body along the axial direction, but the fins were provided spirally on the inner surface of the container body. It's okay to be.

Furthermore, in this example, each fin has a flat shape (in this case, the cross-sectional shape of each fin in the direction perpendicular to the axis is rectangular), but the cross-sectional shape of each fin does not necessarily have to be rectangular. , the cross-sectional shape may be triangular, trapezoidal, semi-elliptical, or the like.

[Effects of the Invention] According to the continuous powder mixing device of the present invention, the following effects (1) to (4) can be obtained.

(1) Continuous input of raw material powder, continuous mixing, and continuous discharge of mixed powder are possible, so there is no waiting time for other equipment, improving work efficiency.

(2) Continuous operation improves the powder mixing capacity per unit time, so there is no need to increase the diameter of the mixing device itself, and therefore the inner diameter of the container is limited within a certain limit. Powder mixing can also be done efficiently.

(3) Because the raw material powder stays inside each stirring container for a certain period of time and is stirred and mixed, even if there is variation over time in the supply amount of different raw material powders, the mixed powder has a stable composition. can be obtained.

(4) At the end of the mixing operation, all mixed powder is discharged by rotating the mixing device for a while after stopping the input of raw material powder, so there is no need to remove the mixed powder or the inside of the mixing device. Does not require cleaning.

[Brief explanation of the drawing]

1 to 5 A to 5B are views showing one embodiment of the present invention, in which FIG. 1 is a side view of a continuous mixing device for powder, FIG. 2 is a cross-sectional view of the stirring vessel alone, and FIG. Figure 3 is a cross-sectional view of a single stirring vessel showing the angle of repose;
FIGS. 5A to 5B are cross-sectional views of the stirring vessel alone showing the movement of the powder, and FIGS. 5A to 5B are side views of the stirring vessel alone showing the movement of the powder. 6A to 6C are drawings showing the operating state of a conventional powder mixing device, and FIGS.
FIG. 6A is a sectional view showing the state when the raw material powder is input, FIG. 6B is a sectional view showing the state when the raw material powder is being mixed, and FIG. 6C is a sectional view showing the state when the mixed powder is being discharged. 20... Mixing device main body, 21... Raw material powder inlet, 22... Mixed powder outlet, 23... Container body,
24a, 24b, 24c, 24d... Kakiage fin, 25, 26, 27... Single stirring container.

Claims (1)

[Claims] 1. A powder mixing device that receives two or more types of raw material powder, mixes them, and discharges the mixed powder,
A continuous mixing device for powders, comprising a, b and c below. a (a) a cylindrical container body with a bulging middle part, narrowing at both ends, and opening at both ends; (b) a frying fin provided on the inner surface of the container body;
A plurality of single stirring vessels consisting of the above are connected on the same axis, and the direction of the central axis of the connected stirring vessels is inclined so that one end thereof is higher than the other end, and further, the stirring vessel is The main body of the mixing device is configured to be rotatable around its central axis. b A raw material powder inlet provided at the upper end of the mixing device main body. c A mixed powder outlet provided at the lower end of the mixing device main body.