JPH08977Y2 - Powder and granular material mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a powder and granular material mixing device for uniformly mixing different powdery and granular materials.

(Prior Art and Problems Thereof) As a conventional powder / granular material mixing device, for example, Jitsuko Sho 55-372
The one described in Japanese Patent Publication No. 30 is known. This device is the fourth
As shown in the figure, a vertical pipe 2 having a large number of inlets 2a on the outer peripheral surface is provided in the tank 1, and a vertical reflux pipe 3 is provided at a predetermined distance from the inner wall surface of the vertical pipe 2 to provide reflux. The high pressure air nozzle 4 is provided by being inserted into the lower end of the pipe 3, and the powder and granules flowing from the suction port 2a through the gap between the vertical pipe 2 and the reflux pipe 3 and the reflux. The powder and granules flowing from the outside of the pipe 3 are blown upward together with the powder and granules in the tank 1 to mix the powder and granules in the tank 1.

However, in the field of such a powder and granular material mixing device,
Further, it has been desired to improve the mixing efficiency while reducing the size of the apparatus.

(Object of the Invention) An object of the present invention is to provide a powder / granular material mixing apparatus that can improve the mixing efficiency while shaping the apparatus.

(Structure of the Invention) The present invention provides an upright tubular container with a vertical inner conduit passing through the axial center of the container, and an outer conduit provided by externally fitting the lower half of the inner conduit with a gap. A nozzle for injecting air is provided with the injection port facing the lower opening of the inner conduit, and the granular material filled in the upright tubular container up to a height not lower than the upper opening of the inner conduit and higher than the upper opening of the outer conduit. , The powder and granules flowing through the gap between the outer conduit and the inner conduit and the powder and granules flowing outside the outer conduit are blown up into the inner conduit by the air jetted from the nozzle and blown from the upper opening of the inner conduit. A powder-and-granule mixing device adapted to mix by discharging, by expanding the lower opening of the inner conduit, narrowing the injection port of the nozzle and making the injection port area smaller than the lower opening area of the inner conduit, an upright cylinder Inclining the lower peripheral wall of the mold container toward the axis center slightly below the lower openings of both conduits In addition, a baffle plate that forms a narrow passage with the peripheral wall is provided around the lower portion of the outer conduit, and the lower end edge of the baffle plate slightly protrudes inside and below the lower opening of the outer conduit. This is a powder and granular material mixing device.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a vertical cross-sectional view showing a powder and granular material mixing apparatus of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of FIG. In the figure, 11 is an upright cylindrical container in which powder and granules are mixed. The lower part of the container 11 is tapered in a conical shape and communicates with the outlet 11a. That is, the peripheral wall 10 at the bottom of the container 11 is inclined toward the axis center. Upper surface 11b of container 11
There is a granular material inlet 11c, a manhole 11d, and an air vent outlet.
11e and are provided.

Inside the container 11, the inner conduit 20, the outer conduit 30, the baffle 40, the nozzle
50 mag is provided. The inner conduit 20 is provided so as to extend vertically from the vicinity of a portion communicating with the outlet 11a to the vicinity of the upper surface 11b. A cone-shaped receiving plate 23, which is convex upward, is provided right above the upper opening 21 of the inner conduit 2 so as to cover the upper opening 21 at a distance. The receiving plate 23 is supported by the inner conduit 20 by a support rod 23a. The apex 23b of the receiving plate 23 is located on the axial center of the container 11. The lower opening 22 is expanded to have a tapered cross section. Inner conduit
The support 20 is supported on the peripheral wall 10 by supports 61 and 62.

The outer conduit 30 is externally fitted and provided in a substantially lower half of the inner conduit 20 so as to have a gap 30a. The upper opening 31 of the outer conduit 30 is expanded to have a tapered cross section. The end face of the lower opening 32 is the inner conduit 20.
Is located on the same plane as the end face of the lower opening 22. Outer conduit
The support 30 is supported on the peripheral wall 10 by supports 63 and 64.

The baffle plate 40 is provided around the lower portion of the outer conduit 30.
The baffle plate 40 has a shape in which an upper plate 41 having a convex cone shape and a lower plate 42 having a convex cone shape are integrally formed with upper and lower openings 41a and 42a. The lower plate 42 is parallel to the peripheral wall 10 of the container 11, and a narrow passage 45 is provided between the lower plate 42 and the peripheral wall 10. The outer conduit 30 is fitted in the opening 41a, and
The peripheral edge of 1a is welded to the outer circumference of the outer conduit 30. Hole 42a
Is located below the lower opening 22 of the inner conduit 20 and the lower opening 32 of the outer conduit 30, and the diameter of the opening 42a is smaller than the lower opening 32 and larger than the lower opening 22. That is, the lower edge 40 of the baffle plate 40
a projects slightly inside and below the lower opening 32 of the outer conduit 30. The baffle plate 40 is supported on the peripheral wall 10 by a support 65.

The nozzle 50 is provided so that the injection port 51 faces the lower opening 22 of the inner conduit 20, and the injection port 51 is provided at the lower end edge portion 40 of the baffle plate 40.
It is located on the same plane as or slightly below the end face of a. The injection port 51 is narrowed and formed, and the injection port area is the lower opening.
It is smaller than the area of 22. As shown in FIG. 3, external air is supplied to the nozzle 50 through a blower 71, a silencer 72, a cooler 73, and a filter 74. A valve 75 is provided between the filter 74 and the nozzle 50, and the air that has passed through the filter 74 is sent to the branch passage 76 to be discharged from the outlet 11a of the container 11 via the rotary valve 77. The granular material can be placed on the air stream and supplied to other places.

Next, the operation will be described. It is assumed that the granular material is put into the container 11 through the inlet 11c and the granular material is filled up to the height A in FIG. The granular material charged from the inlet 11c falls on the upper surface of the receiving plate 23, is divided into four directions, and falls into the container 11. The height of A is detected by the level meter 11f. The height of A may be lower than the upper opening 21 of the inner conduit 20 and higher than the upper opening 31 of the outer conduit 30.

When air is jetted from the jet port 51 in this state, both the granular material flowing through the passage 45 and the granular material flowing through the gap 30a between the outer conduit 30 and the inner conduit 20 are blown up into the inner conduit 20. , Is sent upward through the inner conduit 20 and is blown out from the upper opening 21.
The blown powder and granules collide with the lower surface of the receiving plate 23 and fall around the inner conduit 20, and flow downwards outside the outer conduit 30 or the gap 30.
Flow down a. Since the upper opening 31 of the outer conduit 30 is expanded, the powder and granules easily flow into the gap 30a. The filled powder and granules successively flow through the passage 45 and the gap 30a, and are blown up into the inner conduit 20 by the nozzle 50. In this way, the powder particles in the lower portion of the container 11 and the powder particles in the central portion are mixed, and the powder particles are mixed.

The injection port 51 is close to and faces the lower opening 22 of the inner conduit 20, and the lower opening 22 is expanded in a tapered cross section.
Since the area of 51 is smaller than the area of the lower opening 22,
The air blown out from the injection port 51 is surely blown into the inner conduit 20. However, since the passage 45 is narrow, the granular material flows through the passage 45 little by little and is guided by the lower end edge portion 40a to reach the vicinity of the injection port 51. On the other hand, since the lower opening 22 is expanded to have a tapered cross-section, the gap 30a is narrowed in the lower opening 22, and the granular material flowing in the gap 30a flows little by little in that portion and the lower end The injection port 51 is guided by the edge 40a.
Go to the vicinity of. Further, since the lower opening 22 is expanded in a tapered cross-section, the powder or granular material in the vicinity of the injection port 51 can be easily
Get caught in. Therefore, most of the granular material flowing through the passage 45 and the granular material flowing through the gap 30a are favorably blown into the inner conduit 20 without being blocked by the air from the injection port 51. Therefore, the mixing efficiency of the granular material is improved.

Further, the air blown out from the injection port 51 is surely blown into the inner conduit 20, so that the powder or granules pass through the passage 45 due to the air leakage.
There is no reverse flow through the gap 30a. Therefore, the passage 45 and the gap 3
The length of 0a in the height direction may be short, and the height of the device can be reduced accordingly.

Further, since the injection port 51 is narrowed down, the injected air has a high pressure. Therefore, the amount of air blown from the nozzle 50 may be small and the amount of energy required is reduced.

(Effects of the Invention) As described above, the powdery-particles mixing apparatus of the present invention has the following effects.

(1) Expand the lower opening 22 of the inner conduit 20, narrow the injection port 51, and make the area of the injection port 51 smaller than the area of the lower opening 22,
Baffle plate 40 forms a narrow passage 45 and lower edge
Since 40a is slightly protruded inward and downward from the lower opening 32 of the outer conduit 30, the powder particles flowing through the passage 45, that is, the powder particles at the lower portion in the container 11 and the powder particles flowing through the gap 30a. Body or container 1
Most of the powder in the center of 1 can be blown into the inner conduit 20, and the mixing efficiency of the powder can be improved.

(2) Since the air blown out from the injection port 51 can be surely blown into the inner conduit 20, it is possible to prevent the powdery particles from flowing back through the passage 45 and the gap 30a due to leakage of the blown air. Therefore, the length of the passage 45 and the gap 30a in the height direction can be shortened, and the height of the device can be reduced accordingly. That is, the device can be miniaturized.

(3) Since the injection port 51 is narrowed down, the injected air has a high pressure. Therefore, the amount of air blown from the nozzle 50 can be reduced, and the amount of energy required can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a powder and granule mixing apparatus of the present invention,
1 is an enlarged cross-sectional view of the main part of FIG. 1, FIG. 3 is a view showing an air supply path to a nozzle, and FIG. 4 is a vertical cross-sectional view showing a conventional powder / granular material mixing device. 10 …… Peripheral wall, 11 …… Container, 20 ……
Inner conduit, 30 …… Outer conduit, 30a …… Gap, 21,31 …… Upper opening, 22,32 …… Lower opening, 40 …… Baffle plate, 50 …… Nozzle,
51 …… Jet port

Claims (1)

[Scope of utility model registration request] 1. An upright tubular container is provided with a vertical inner conduit passing through an axial center of the container, and an outer conduit is provided by fitting the outer conduit into a substantially lower half of the inner conduit so as to have a gap, and injects air from the outside. A nozzle is provided with the injection port facing the lower opening of the inner conduit, and the granular material filled in the upright tubular container to a height not lower than the upper opening of the inner conduit and higher than the upper opening of the outer conduit is referred to as the outer conduit. The powder and granules flowing through the gap with the inner conduit and the powder and granules flowing outside of the outer conduit are blown into the inner conduit by the air jetted from the nozzle and mixed by blowing out from the upper opening of the inner conduit. In the powder and granular material mixing device, the lower opening of the upright tubular container is expanded by expanding the lower opening of the inner conduit, narrowing the injection opening of the nozzle, and making the injection opening area smaller than the lower opening area of the inner conduit. Inclining the peripheral wall of the pipe toward the axial center slightly below the lower openings of both conduits A baffle which forms a narrow passage between the outer wall and the peripheral wall is provided around the lower part of the outer conduit, and a lower end edge of the baffle is slightly projected inside and below the lower opening of the outer conduit. Powder and granular material mixing device.