JPS62132555A - Vibration ball mill - 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 is a vibrating ball mill, particularly for producing magnesia (M2O) and alumina (A1) used as raw materials for ceramics and abrasives.
The present invention relates to a vibrating ball mill suitable for grinding zirconia (Z ro 2), silicon carbide (SiC), etc.

(Conventional technology) Powder products such as magnesia and alumina, which are raw materials for ceramics and abrasives, are produced by melting high alumina raw materials or magnesia raw materials in an electric furnace in advance to greatly develop crystals, and then producing powder products such as electrofused alumina or alumina. Li-fused magnesia is produced, which is then pulverized to an appropriate particle size and used for various purposes.

That is, the above-mentioned alumina, magnesia, silicon carbide,
Naturally, it has been common knowledge that an electric furnace and a pulverizer are used to produce powder products such as zirconia, and that the melting process and the pulverizing process are carried out separately. Therefore, low productivity and high costs were thought to be unavoidable.

(Object of the invention, structure) In view of the above problems, the present invention has not only a crushing function but also a melting function.
The purpose of the present invention is to provide a pulverizer that has not existed in the past, which also has 11 functions and can perform a melting process and a pulverizing process at the same time.

Conventionally, various types and structures of crushers have been proposed, but in order to achieve the above object, the present inventors particularly focused on a vibrating ball mill. That is, the structure of the present invention in accordance with the above object is to load the raw material to be crushed and the crushing medium into a mill body, support the mill body with a spring, and attach an eccentric vibration source to a shaft rotationally driven by a motor. Vibrating the remill main body by rotation of the eccentric vibration source,
In the vibrating mill 7, which performs pulverization by imparting motion to the pulverizing medium, the pulverizing medium is made of a conductive material, and an electrode for generating an arc discharge is disposed inside the mill body.

(Function) According to the present invention, when the mill body is vibrated to cause the grinding medium to jump, collisions and repulsions are repeated between the electrodes, the conductive grinding medium, and the conductive grinding media themselves. Therefore, when a high voltage is applied between the electrodes, an arc discharge occurs between the electrodes and the conductive grinding medium, and the raw material in the arc discharge path is instantly melted by the arc heat. At the same time, the raw material between the grinding media and the mill peripheral wall is pulverized due to collisions between the grinding media and the mill peripheral wall.

(Example) An embodiment of the present invention will be described in detail below.

The figure is a partially updated front view of this embodiment. In the figure, 1 and 2 are cylindrical mill bodies, which are connected by a frame 3 so that they vibrate together. A passage (not shown) is provided between the mill bodies 1 and 2, and the raw material to be ground is ground in the mill 1 and then transferred to the mill 2, where it is further pulverized. A shaft 4 rotatably driven by a motor (not shown) is rotatably mounted on the frame 3, and an eccentric weight 5 is attached to the shaft 4 as an excitation source. Further, a spring 10.11 is interposed between the arms 6.7 protruding from the left and right sides of the frame 3 and the machine stand 8.9.

An electrode 12 is disposed at the center inside the mill body 1, and an electrode 12 is disposed inside the casing 13 of the mill body.
Attach 4. A high voltage is applied between both electrodes from a power supply unit 15 consisting of a generator, a transformer, etc. Further, conductive metal balls 16 such as chilled cast iron or molybdenum alloy steel are charged as a grinding medium.

The present embodiment has the above-described configuration, and when the motor is started to drive the shaft 4 and rotate the eccentric weight 5, the mill main body 1.
2 is excited and the metal ball 16 in the mill begins to jump, and the metal ball 16 repeatedly collides and repulses with the electrode [2.14], and the balls 16 also repeatedly collide and repel each other. Therefore, when a high voltage is applied from the power source 15 between the electrodes 12 and 14, an arc discharge occurs between the two electrodes and the metal balls scattered between the two electrodes. In particular, the collision and repulsion between the metal ball 16 and the electrodes 12 and 14 and the same ball are caused by Mill 1.
Since the arc discharge is repeated frequently throughout the interior, a stable arc discharge can be obtained, and the arc discharge is generated at different times and at different locations. When arc discharge occurs, the raw materials on the discharge path are instantly melted by arc heat, producing fused alumina, fused magnesia, and the like. The simultaneously generated molten material is pulverized by collisions between the balls 16 and collisions between the balls and the inner wall of the mill.

(Effects of the Invention) According to the present invention, by focusing on a vibrating ball mill among various types of pulverizers, and adding a melting function to the vibrating ball mill, it is possible to produce a molten substance such as fused alumina or fused magnesia. Since the process and the subsequent bamboo crushing process can be carried out simultaneously with one device, the process is simplified, production costs can be reduced, and the quality of the product is uniform, which is a remarkable effect.

[Brief explanation of drawings]

The drawing is a partially broken front view showing an embodiment of the present invention.

Claims (1)

[Claims] Raw materials to be crushed and grinding media are loaded into a mill body, the mill body is supported by a spring, and an eccentric vibration source is attached to a shaft rotationally driven by a motor. In a vibrating ball mill in which the mill body is vibrated by rotation to give motion to the grinding medium to carry out grinding, the grinding medium is made of a conductive material, and electrodes for generating arc discharge are arranged inside the mill body. The vibratory ball mill is characterized by: