JPS6031838A - Semi-wet finely crushing machine - 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 In relation to functional materials, fine particles having various physical or chemical properties are becoming important in various fields such as electrified materials and fine ceramics.

The present invention relates to a pulverizer that meets these needs.

It was difficult to construct a conventional crusher using high-speed airflow.

This invention aims to pulverize a part of the pulverized product by coagulating and refluxing a part of the pulverized product using high-speed airflow, thereby increasing the residence time of the pulverized product and pulverizing the pulverized product. To explain, in FIG. 1, the main body of a semi-wet type pulverizer is broadly divided into a crushing section 1 and an agglomeration/classification section 2. The crushing section has a cylindrical crushing chamber 3.
4. A nozzle 4 for introducing compressed gas into the interior of the grinding chamber is arranged on the side wall of the grinding chamber. The direction of the nozzle is fixed so as to be in contact with the circumference of the airflow ascending funnel 5 provided in the grinding chamber. Further, a sample supply device 6 is provided above each nozzle in the grinding chamber so that the supplied sample is carried on the high-speed airflow of each nozzle. The aggregation and classification section has a cylindrical section 7 and a conical section 8 arranged in series to form a sealed structure, and an air flow inlet 9 for pressurizing a spray-like air flow into the cylindrical section.
The airflow is introduced in the tangential direction to agglomerate the coarse particles and classify the fine particles of the pulverized product in the agglomeration and classification section, and the agglomerates are returned to the coarse particle return provided at the boundary between the agglomeration and classification section and the grinding chamber. It is returned to the grinding chamber along the funnel (also known as an airflow ascending funnel) 5 and is ground again. Further, the fine powder is discharged and collected from the airflow riser pipe 10 provided above the agglomeration and classification section.

In this invention, a high-speed airflow is collected from a nozzle toward the center of a cylinder, and the crushed material supplied from a sample supply device in the upper part of the crushing chamber is collided with the sample at high speed to be crushed.

The pulverized material rides on the updraft and is guided to the aggregation and classification section by the airflow ascending funnel. In the aggregation and classification section, a spray airflow is forced into the updraft inlet to create a swirling flow in the aggregation and classification section, and the pulverized products are classified using the centrifugal effect. In the agglomeration and classification section, the coarse particles are pushed out toward the side wall of the aggregation and classification section by centrifugal force. In addition, the water droplets in the spray airflow are also subjected to centrifugal force and are pushed toward the side wall in the same way as the coarse particles, so the coarse particles aggregate during this process and become even larger particles. The particles are returned to the grinding chamber along the coarse particle return row 1 and ground again. In addition, the fine particles are not affected much by the centrifugal effect, gather at the center, ride the rising air current, are discharged out of the thread from the airflow riser pipe attached to the top of the agglomeration□ classifier, and are collected by the collection device.

As explained above, the present invention utilizes high-speed airflow to pulverize, and a part of the pulverized product is coagulated and refluxed to atomize it.

[Brief explanation of the drawing]

An example of a semi-wet type pulverizer is shown in FIGS. 1 and 2. Below is a description of typical parts of this device. 1 crushing section, 2 agglomeration and classification section, 3. Grinding chamber main nozzle, 5. Airflow ascending funnel, 6. Sample supply device? 0
Cylindrical part, a conical part, 9. Airflow introduction port 10 Airflow riser pipe Patent applicant: Director of the Agency of Industrial Science and Technology Kawa 1) Yube 5-

Claims (3)

[Claims] (1) A nozzle for introducing compressed gas is arranged on the side wall of the cylindrical crushing chamber, facing toward the center, and the gas is introduced from the nozzle in a direction tangent to the circumference of the gas riser pipe of the aggregation and classification section. A device that crushes the sample supplied from the sample supply device attached above the crushing chamber and above each nozzle by placing it on a high-speed airflow. (2) A patent characterized in that the pulverized sample powder is introduced into an agglomeration and classification section, and a spray-like airflow is forced into the inlet of the classification section to simultaneously agglomerate the coarse particles of the pulverized product and classify the fine particles. Apparatus according to claim 1. (3) The apparatus according to claim 1, characterized in that a funnel for introducing pulverized products and for returning agglomerated particles and coarse particles is attached to the boundary between the agglomeration and classification section and the pulverization chamber.