JP2747520B2 - Powder dispersing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a powder disperser, and more particularly to a powder having a tendency to aggregate to form secondary particles for powder classification, for example. Particularly, the present invention relates to a disperser which can be dispersed in primary particles at a high rate and contained in a powder carrier gas.

(Prior Art) Generally, when handling powders (hereinafter collectively referred to as “powder”), it is often necessary to handle the powder as single particles (primary particles). For this reason, various kinds of suitable dispersing machines and the like have been provided in the past, from so-called fluids having a large particle size to fine powders which easily aggregate to form secondary particles, and efficiently dispersing them according to the particle size and properties. ing.

Principle methods for such powder dispersion include an air flow dispersion method using an ejector action and a velocity gradient action, a method of mechanically utilizing a crushing action by mixing coarse particles such as glass beads, A method is known in which the powder is caused to collide with a barrier or the like while being conveyed in a gas stream, and most of the conventional dispersers use any of these methods alone or in combination.

Also, from the viewpoint of the difficulty of powder dispersion, powders (granules) having a large particle diameter are generally easily dispersed, and therefore a simple disperser using a mechanical method is used. In many cases, on the other hand, fine powders have a problem of secondary particle formation due to agglomeration. Therefore, a complicated dispersion mechanism is required, and an air flow type is often used.

By the way, the following structure is conventionally known as a conventional example of a fine powder disperser which easily forms such secondary aggregated particles. That is, a powder is charged into a fluidized bed filled with coarse particles, and a gas is blown up from under the fluidized bed so that only fine powder (particles) having a certain diameter or less is raised by an air current. The air flow containing the fine powder is further introduced into a thin tube as required, and accelerated, thereby giving a loosening action to the secondary particles in the tube.

(Problems to be Solved by the Invention) However, as described above, the apparatus of the type in which the fine powder is dusted by an air current disintegrates the secondary aggregated particles contained in the fine powder introduced into the fluidized bed. There is no particular effect of dispersing (dispersing) into primary particles. Therefore, it can be said that the dispersing efficiency is high because only the dusted portion of the input fine powder becomes particles dispersed in the airflow. Was not there.

An object of the present invention is to provide a disperser of the type that generates dust using such an air flow and that enables efficient powder dispersion while continuously introducing fine powder. It was done as.

Another object of the present invention is to provide a dispersing machine having a structure capable of efficiently exerting the action of mechanically crushing the input powder and the action of blowing up the crushed powder by airflow. It is in.

(Means for Solving the Problems) The feature of the powder dispersing machine according to the first aspect of the present invention, which has been made for realizing such an object, is that the powder dispersing device is substantially externally provided for dispersing the powder. A partitioned vertical cylinder, and placed near the bottom surface in the vertical cylinder and rotated about the center vertical axis of the vertical cylinder to agitate and flow the input powder to provide a mechanical crushing action. A stirring blade and a powder feeding means for feeding the powder to be dispersed into the vertical cylinder are provided. At the top of the vertical cylinder, a small-diameter transport pipe for discharging a gas stream containing the dispersed powder is opened. A connected powder disperser, wherein the stirring blade has a swirling blade portion extending radially along a bottom surface of the vertical cylinder, and a bottom surface of the vertical cylinder of the swirling blade portion. On the surface facing the air outlet where the gas outlet for blowing up the powder is provided. The feature of the powder dispersing machine according to the second aspect of the present invention is that a horizontal cylinder substantially partitioned from the outside for powder dispersion and a body disposed inside the horizontal cylinder are disposed in close proximity to the body. A stirring blade that agitates and flows the input powder by being rotated about the central horizontal axis of the horizontal cylinder to provide a mechanical crushing action, and a powder input unit that inputs the powder to be dispersed into the horizontal cylinder. With
A powder dispersing machine in which a fine-diameter transport pipe for discharging a dispersed-powder-containing airflow is connected to the upper part of the horizontal cylinder by a hole, wherein the stirring blade is arranged along the inner surface of the body of the horizontal cylinder. A gas outlet for blowing up powder is provided on a surface of the swirling blade portion extending toward the inside of the body of the horizontal cylinder.

In the present invention, the cylinder is generally provided as a vertical cylinder. In this case, the stirring blade provided with the gas outlet is provided near the bottom surface, and the transport pipe is provided as a vertical cylinder. It is common to make an open connection at the top of the hole. In addition, it is preferable that the stirring blade is provided not only at the bottom position of the cylinder but also at an intermediate position of the cylinder for gas dispersion. The cylinder is not particularly limited to a vertical cylinder, and may be a horizontal cylinder. In this case, a plurality of agitating blades extend radially from the center of the end face on one end side of the horizontal cylinder along the end face. Is bent into an L-shape to extend along the inner surface of the cylindrical body of the cylinder, and a gas for blowing up powder over the entire surface of the stirring blade facing the inner surface of the L-shaped cylindrical body. Is preferably provided.

(Effect) The powder dispersing machine of the present invention, by having the above-described configuration, mechanically crushes the secondary particles even with the stirring blades, even for fine powders containing a large amount of aggregated secondary particles,
In addition, since the stirring blade itself that provides the crushing action blows out the gas for transporting the powder, good powder dispersion can be efficiently obtained.

(Examples) Hereinafter, the present invention will be described based on examples shown in the drawings.

FIG. 1 is a diagram showing a schematic configuration of a powder dispersing machine according to a first embodiment of the present invention. In this figure, 1 is a vertical cylinder forming a powder flow chamber for dispersing powder. At the bottom, a first stirring blade 2 rotating along the bottom surface is arranged. The first stirring blade 2 has a rotating shaft 3
Penetrates the bottom of the vertical cylinder 1 through a sealing member (not shown) in a state of being hermetically sealed from the outside, and is supported by an external bearing 5.

The rotating shaft 3 is adapted to be rotated by a motor 8 via a pulley 6 and a belt 7, and from the bearing 5,
Pressurized air is supplied from an external air supply device (not shown) to an air passage 3a provided inside the rotary shaft. Also the first
As shown in FIG. 1 (b), the stirring blade 2
The blade 9 is formed so as to have a blade portion 9 extending radially (in this example, a cross shape) from the blade member 9. The blade portion 9 is connected to an air passage 3 a inside the rotary shaft 3 via an air passage 9 a. An air outlet 9b opened on the lower surface is provided.

The rotating shaft 3 is provided so that the shaft portion extends further upward from the blade portion 9 of the first stirring blade 2, and extends radially from the shaft portion extending upward. A large number of flat plate-shaped second stirring blades 10 are provided at appropriate intervals. In the present embodiment, the second stirring blade 10 uses a vertically thin plate.

The upper part of the vertical cylinder 1 is provided with a connection opening of a thin tube 11 having a cross-sectional area sufficiently smaller than the horizontal cross-sectional area in the flow chamber inside the vertical cylinder, and an air flow containing dispersed powder that rises by an air flow described later. And transported to another powder processing device (not shown) via the thin tube. The upper portion of the vertical cylinder is provided as an inverted conical portion 1a whose diameter gradually decreases toward the opening of the thin tube 11, and the powder-containing air flow smoothly guides the inside of the thin tube 11 to retain the powder. Is less likely to adhere to the wall.

The vertical cylinder 1 has a screw feeder as shown in the figure.
A powder supply port 14 from 13 is opened at a position slightly higher than the arrangement position of the first stirring blade 2. The screw feeder 13 has a storage tank 16 into which the powder is charged via a sealed valve 15 such as a rotary valve, and a feeder screw 18 at the lower part of the storage tank which supplies the powder into the vertical cylinder via a supply pipe 17, Connect this feeder screw 18 to the belt pulley 19
And a motor 20 that rotates through the inside of the vertical cylinder 1.
It is supplied to the ball filling section of the stirring blade 2. Reference numeral 21 denotes a sealing member for sealing the rotating portion of the feeder screw from the outside.

In this example, the communication pipe 22 connects the upper part of the vertical cylinder and the space above the screw feeder 13. This is because the air is blown out from the air outlet 9b of the blade portion 9 of the first stirring blade 2 in the vertical cylinder 1, so that the air pressure is generated in the direction of the storage tank 16 through the supply pipe 17 and the powder is returned. This is to avoid inconvenience caused by this.

 Next, the operation will be described.

When the disperser in the illustrated state is operated, an appropriate amount of powder is supplied from the storage tank 16 to the inside of the vertical cylinder by the feeder screw 18.

On the other hand, inside the vertical cylinder 1, the rotating blades 3 are rotated by the motor 8, whereby the blade portions 9 of the first stirring blades 2 are swirled to mechanically stir and flow the charged powder. In addition, air supplied from outside is blown from the lower surface of the blade portion 9 with the rotation of the blade portion 9, and the blown air rises to the upper portion. Disperse above the inside of the cylinder 1. In the configuration as in this example, since the crushing is mechanically performed by the movement of the blade portion 9 of the first stirring blade, the screw feeder 13 is used.
Of the powder supplied from the initial stage, not only the primary particles are blown up by the airflow in the state of primary particles, but also the particles that have been disaggregated by crushing are blown up in the same way. It will rise to the upper side of the cylinder. Then, the blown airflow containing the powder dispersed in the state of substantially primary particles further enters the thin tube 11 and is accelerated, so that a further dispersing effect is provided.

Further, a mechanical stirring action by the second stirring blade 10 is further given to the rising powder.

As described above, the powder dispersion by the disperser of the present embodiment combines the mechanical crushing action and the action of the powder transport airflow blown out using the first stirring blade 2. Thus, there is an effect that the supplied powder is efficiently and sufficiently dispersed.

FIG. 2 shows a second embodiment, in which the apparatus having the configuration in this example has a plurality of second stirring blades 30 formed in a round bar shape and extended radially from the rotating shaft 3 at appropriate intervals. The other configuration is the same as that of the first embodiment. In this example, the same effect as in the first embodiment can be obtained.

FIG. 3 shows the configuration of a dispersing machine according to Embodiment 3 of the present invention. The feature of this embodiment is that a cylinder 40 containing stirring blades for crushing and dispersing powder is made horizontal.

With such a change in the attitude of the cylinder, the first stirring blade 41 in the present example becomes the end face of the cylinder 40 (Example 1).
(Corresponding to the bottom surface of the cylinder 40) in the radial direction (in this example, a prism having a diametrical direction as shown in FIG. 3 (b)). It is bent so as to be L-shaped from the position, extended in the generatrix direction along the inner surface of the cylindrical body, and further bent at a right angle at the other end surface of the cylinder to form a C-shaped stirring blade as a whole. An air passage 41a is provided over substantially the entire area of the C-shaped stirring blade 41, and an air outlet is provided on a surface facing the inner surface of the cylinder.
41b is opened at appropriate intervals.

Reference numeral 42 denotes a rod-shaped auxiliary stirring blade extending inward from a radially inner surface of the C-shaped stirring blade 41.

A powder supply port 14 from a screw feeder 13 is opened at the center of the other end surface of the cylinder, and a thin tube 11 for leading an air flow containing the dispersed powder is connected to the upper part of the body of the cylinder 40 by opening. Other configurations are substantially the same as those of the first embodiment.

According to this example, the same effect of powder dispersion as in Example 1 can be obtained.

It should be noted that the present invention is not limited to the embodiments described above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit of the invention.

(Effects of the Invention) As described above, the disperser according to the present invention is capable of efficiently performing mechanical pulverization and transport of powder by air flow while continuously feeding fine powder. Effective, especially with stirring blades over several hundred rpm, especially 1000 rpm
An excellent effect is exhibited as a high-speed rotation type processing apparatus that rotates at the above speed.

Further, according to the present invention, it is possible to continuously supply the powder while efficiently exhibiting the action of mechanically crushing the input powder and the action of blowing up the crushed powder by an air current. . There is also an effect that the powder can be continuously dispersed as a disperser having a simple structure.

[Brief description of the drawings]

FIG. 1 (a) is a diagram showing an outline of a configuration of a dispersing machine according to a first embodiment of the present invention, FIG. 1 (b) is a view taken on line AA of FIG. ) Is a view taken in the direction of arrows BB in FIG. FIG. 2 (a) is a diagram showing an outline of the configuration of a second embodiment of the dispersing machine of the present invention, and FIG. 2 (b) is a view taken along the line CC in FIG. 2 (a). FIG. 3 (a) is a diagram showing an outline of the configuration of a third embodiment of the dispersing machine of the present invention, and FIG. 3 (b) is a view taken in the direction of arrow DD in FIG. 3 (a). 1: Vertical cylinder, 1a: Inverted conical section 2: First stirring blade 3: Rotating shaft, 3a: Air passage 5: Bearing bearing 6: Pulley, 7: Pulley belt 8: Motor, 9: Blade 9a: Air passage, 9b: outlet 10: second stirring blade, 11: thin tube 13: screw feeder 14: supply port, 15: sealed valve 16: storage tank, 17: supply pipe 18: feeder screw 19: belt pulley, 20 : Motor 21: Seal member, 22: Communication pipe 40: Cylinder, 41: Stirring blade 41a: Air passage, 42b: Air outlet 42: Auxiliary stirring blade

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Rokuo Kokubu 3-15-11, Baba, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-58-114722 (JP, A) JP, B2) Jiko 55-47645 (JP, Y2)

Claims (2)

(57) [Claims] 1. A vertical cylinder substantially partitioned from the outside for powder dispersion, and disposed near a bottom surface of the vertical cylinder and rotated about a central vertical axis of the vertical cylinder. A stirrer that imparts a mechanical crushing action by stirring and flowing the input powder by means of, and powder input means for inputting the powder to be dispersed into the vertical cylinder, on the upper part of the vertical cylinder, A powder disperser in which a small-diameter transport pipe for discharging a dispersed-powder-containing air stream is connected to an opening, wherein the stirring blade has a swirling blade portion extending radially along a bottom surface of the vertical cylinder. And a gas outlet for blowing up powder is provided on a surface of the revolving blade portion facing the bottom surface of the vertical cylinder. 2. A horizontal cylinder substantially partitioned from the outside for powder dispersion, and disposed near an inner surface of a body of the horizontal cylinder and rotated about a central horizontal axis of the horizontal cylinder. A stirring blade that imparts a mechanical crushing action by stirring and flowing the powder to be supplied, and powder feeding means for feeding the powder to be dispersed into the horizontal cylinder. A powder disperser in which a small-diameter transport pipe for discharging a body-containing air stream is connected to an opening, wherein the stirring blade has a swirling blade extending along an inner surface of a body of the horizontal cylinder. A powder dispersing machine characterized in that a gas outlet for blowing up powder is provided on a surface of the revolving blade portion facing the inner surface of the body of the horizontal cylinder.