JPS6135858A - Pulverizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a pulverizer that uses high-pressure gas to produce finer powder from powder that has been made finer in advance. It is related to.

[Conventional technology]

A pulverizer using high-pressure gas, such as compressed air, includes friction pulverization in a high-speed swirling flow using a pulverizing guide as shown in Japanese Patent Publication No. 47-4389,
Powder particles are collided with each other at high speed using high-pressure air injection nozzles arranged oppositely as shown in Japanese Patent Application No. 449, or on an inclined collision plate at high speed as shown in Japanese Unexamined Patent Publication No. 143853/1983. There are some types of pulverizers that use collisions, but all of these pulverizers have many problems.

[Problem that the invention seeks to solve]

With the conventional swirling friction grinding alone, particles that have been refined to a certain extent take on a nearly spherical particle shape and cannot be crushed.However, with opposed injection nozzles, the grinding force is weak, which limits the ability to make the particles finer. In addition, if only impact pulverization is used, the fine particles will have an angular shape with acute corners, which poses a problem in that the flowability and filling properties of the fine powder will be impaired. However, a large structural space is required.

The present invention solves these conventional problems, satisfies each of the conventional functions at the same time, and provides a fine pulverizer that can stably obtain ultrafine powder particles that can eliminate obstacles to fluidity and filling properties. This is what we are trying to provide.

[Means for solving problems]

In order to solve the above problems, the present invention has a raw material supply port at one end and a raw material supply nozzle that spouts high-pressure gas, i1! A rotating crushing nozzle is formed, which has a solid-gas mixing chamber with an opening, a collision plate is provided at the other end, and a rotating crushing nozzle for spouting high-pressure gas, and these solid-gas mixing chambers and the rotating crushing chamber are connected to each other. An accelerating tube having one end facing the collision plate is used for slow passage, a classifying chamber is formed on the outer periphery of the accelerating tube and communicates with the rotating crushing chamber through a rectification zone, and the accelerating tube is further connected to the classifying chamber to surround the accelerating tube. The apparatus is characterized in that an annular classification plate is provided, the inside of which communicates with the discharge hole, and the outside of which communicates with the solid-gas mixing chamber.

〔Example〕

One embodiment of the present invention will be described with reference to the drawings.
is an outer shell, and a solid-gas mixing chamber 2 is formed at one end thereof, and a raw material supply port 6 is formed in this solid-gas mixing chamber 2.

A raw material supply nozzle 6 is opened adjacent to the high-pressure header 4 through a compressed air pipe 5 to eject compressed air.

A rotating crushing chamber 7 is formed at the other end of the outer shell 1, and compressed air pipes 8m, 8b, . . . are provided in the rotating crushing chamber 7, respectively.
Rotating crushing nozzles 9a, 9b, which are connected to the high-pressure header 4 via J3n-s, 8n and eject compressed air;
...9n-1, 9n are equally arranged on the outer circumference at an angle of 0 to the center of the chamber and are open.

Further, a collision plate 10 is provided in the rotating crushing chamber 7, and this collision plate 10 also serves as a component of the bottom plate 11 of the rotating crushing chamber 7, and is arranged in the center.

Further, the solid-gas mixing chamber 2 and the swirling crushing chamber 7 are communicated by an acceleration tube 12 for accelerating the solid-gas mixture flow, and the streamline of the acceleration tube 12 is spaced at a certain interval between the discharge tip t and the collision plate 10. However, it is preferable that the discharge tip of the acceleration tube 12 is expanded into a trumpet shape as shown in the illustrated example.

Furthermore, an annular rectifying sheath 716 is provided on the outer periphery of the accelerating tube 12 at a predetermined distance from the outer shell 1, and the rotating crushing chamber 7 is communicated with the classification chamber 14 via this rectifying zone 16.

Furthermore, in the classification chamber 14, surrounding the accelerating tube 12,
A dovetail-shaped classification plate 15 is provided for classifying ultrafine powder and fine powder that does not fall into a predetermined particle size, and the inside thereof is connected to an ultrafine powder chamber 16. The outside is divided into a fine powder chamber 17, and the ultra fine powder N16 has discharge holes 18m, 18b, . . . 18n-t communicating with this chamber.
, 18m is each discharge pipe 19g, 19b, -=-19n-
x, 19n to the collection discharge pipe 20, while the fine powder 3417 passes through the circulation holes 21m, 21b, . . .
・21 island - Goose is connected to the solid-gas mixing chamber 2 via 21n.

Now, compressed air pipes 5 and 8 m are connected to the high pressure header 4.

Compressed air passes through the raw material supply nozzle 6 and the rotating crushing nozzle 9m, 9b, .
...9n-119n When I'm gushing,
When the fine particles for pulverization are supplied through the raw material supply port 6, they are introduced into the acceleration tube 12 while being mixed with the ejected air in the solid-gas mixing chamber 2, and have a certain velocity energy. The fine particles collide with the collision plate 10 and further break or crack, scattering parallel to the collision plate 10 and radially, and flying into the rotating crushing chamber 7. In the rotating crushing chamber 7, rotating crushing nozzles 9a and 9b.

...9n-heavy, 9n are arranged at equal intervals on the outer peripheral wall, and 9. Since high-speed jet air is ejected from these nozzles, the radially scattered crushed powder is swirled at high speed by the high-speed jet air, and during this time the crushed powder collides and rubs against each other to be further crushed. That is, in the rotating crushing chamber 7, centrifugal force acts on the powder due to high-speed rotation, and large particles rotate on the outer wall side while passing through the rotating crushing nozzles 9 a e 9 b+...9
The pulverization is further repeated by n-+ and 9n, resulting in finer particles.

The fine powder is rotated and moved to the center of the rotating crushing chamber 7 due to the cyclone effect.

It moves in the direction of the classification chamber 14 while rotating the rectification zone 13 at a higher speed, but the classification of fine powder is promoted in the rectification sheath 716, and the side near the center, that is, the outer circumferential side of the accelerating tube 12, is divided into ultrafine powder and the outside. On the side in contact with the barrel 1, the powder is classified into relatively coarse particles, rectified, and delivered to the classification chamber 14.

It is preferable that the classification chamber 14 widens from the inlet to the bottom as shown in the illustrated example, and in that case, the centrifugal force caused by the rotation 5 will gradually decrease, and the classification effect will be attenuated.

However, the centrifugal action has not completely disappeared, and due to the centrifugal force applied to the fine powder by the rectifying sheath 716, only the ultrafine powder flows into the annular classification plate 15 along with the swirling upward airflow. I will do it. Note that the classification effect can be further enhanced by setting the area of the gap formed between the inside of the classification plate 15 and the outer peripheral surface of the accelerator tube 12 to be close to or smaller than the cross-sectional area of the rectifying sheath 716.

The ultrafine powder that has passed through the inside of the first classification plate 15 passes through the discharge holes 18m, 18b, = 18n-1, 18n, and the discharge pipes 19m, 19b, = 19n-t.
, 19n, and reaches the collection discharge pipe 20, where it is pumped to the next process. On the other hand, the particles that have reached the fine powder chamber 17 are
The air enters the solid-gas mixing chamber 2 again from 9, and is sucked into the acceleration tube 12 together with the fine particles for pulverization supplied from the raw material supply port 6 by the air ejected from the raw material supply nozzle 6, and collision pulverization and rotational friction pulverization are repeated 9. It will be returned.

The pulverizer shown in the above embodiment can also be used upside down from the one illustrated, or as a stack.

〔Effect of the invention〕

As described above, according to the present invention, there is a first step of colliding and pulverizing the fine particles that are the raw material, and further pulverizing the angular fine powder obtained in the first step while shaving off the sharp parts by swirling friction. The spherical fine powder obtained in the second step is guided again to the collision crushing step of the first step, which not only makes it easy to obtain fine powder, but also The method classifies fine powder and ultra-fine powder from the powder that has been made fine by impact and swirling friction, and recovers the ultra-fine powder as a product, but relatively coarse fine powder is subjected to the above-mentioned collision grinding and swirling friction grinding again. Not only can the recovered product be adjusted to the desired particle size, but also its shape can be adjusted to a certain level, eliminating obstacles such as flowability and filling properties with fine powder, and making the overall product extremely compact. This has extremely beneficial effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional side view, Fig. 2 is a sectional view taken along I-I@ in Fig.
It is a sectional view taken along the line shown in FIG. DESCRIPTION OF SYMBOLS 1... Outer shell, 2... Solid-gas mixing group, 6... Raw material supply port. 4...High pressure header * 5.8m, 8b, "・"'8
n-s, 8n... Compressed air pipe, 6... Raw material supply nozzle, 7... Rotating crushing chamber, 9a, 9b,...
-9n-r, 9n... rotating crushing nozzle, 10...
Collision plate, 11... Bottom plate, 12... Accelerator tube, 16...
- Rectification zone, 14... Classifying room, 15... Classifying plate,
16...Ultrafine powder block, 17...Fine powder chamber, 18m, 18
b,..."18n-1, 18n-discharge hole, 19a,
19b,...19n-s, 19n...Discharge pipe, 20...Collective discharge pipe, 21m, 21b,...
...21n-x, 21n-circulation path.

Claims (1)

[Claims] 1. Swirling pulverization in which a solid-gas mixing chamber is formed with a raw material supply port and a raw material supply nozzle for spouting high-pressure gas adjacent to each other at one end, and a collision plate is provided at the other end for spouting high-pressure gas. A rotating crushing chamber is formed in which a nozzle is arranged, and these solid-gas mixing chambers and the rotating crushing chamber are communicated through an acceleration tube whose one end is opposed to the collision plate, and a rectifying zone is formed on the outer periphery of the acceleration tube. forming a classification chamber communicating with the rotating crushing chamber, further providing an annular classification plate surrounding the accelerating tube in the classification chamber, with the inside thereof serving as a discharge hole;
A pulverizer, characterized in that the outside is connected to the solid-gas mixing chamber. 2. The pulverizer according to claim 1, wherein the end of the acceleration tube facing the collision plate is expanded into a trumpet shape. 3. The pulverizer according to claim 1 or 2, wherein the classification chamber is flared out from the inlet. 4. Claims 1 to 3, wherein the area of the gap formed between the inside of the classification plate and the outer peripheral surface of the accelerator tube is set to be close to or smaller than the cross-sectional area of the rectification zone.
A pulverizer as described in any one of the following paragraphs.