JPS6134050Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ball mill that finely pulverizes solid particles by stirring the slurry solid particles together with a large number of hard balls.

Such a ball mill consists of a cylindrical or polygonal cylindrical container provided with an inlet and an outlet for receiving the pressurized slurry processed material, and a container extending in the longitudinal direction of the container and rotatably supported. a plurality of disc-shaped or pin-shaped stirring members fixed on the shaft at intervals in the longitudinal direction; a drive device for rotating the rotation shaft; and a drive device housed in the container. It includes hard balls that perform a large number of crushing actions,
A screen is provided at the entrance to prevent hard balls. In a ball mill with such a configuration, hard balls may accumulate on the hard ball blocking screen at the inlet, and in that case, the slurry must enter the container through the gap between the screen and the remaining hard balls. subject to pressure loss. However, even if the slurry of the material to be processed has the same viscosity as conventionally processed, it suffers a pressure loss when passing between the screen and the retained hard balls, the pressure loss is not that large, and the ball mill operates satisfactorily. It was possible.

However, in recent years, there has been a trend to increase the viscosity of slurry by increasing the ratio of solid particles to liquid in order to increase the pulverization efficiency. However, the pressure loss experienced when passing through the gap between the screen and the retained hard balls increases as the viscosity increases, making it difficult to force the slurry into the container. And the viscosity
When the pressure exceeds 500 poise, it becomes almost impossible to press in the slurry.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a ball mill which is designed to facilitate the supply of slurry even if the slurry has a high viscosity.

That is, according to the present invention, there is provided a cylindrical container provided with an inlet and an outlet for receiving the pressurized slurry processed material, and a cylindrical container extending in the longitudinal direction of the container and rotatably supported. a shaft, a plurality of stirring members fixed on the shaft at intervals in the longitudinal direction, a drive device for rotating the rotating shaft, and a number of crushing members housed in the container. hard balls, and the inlet is provided with a hard ball blocking screen, the inlet is provided in the container so as to be concentric with the rotating shaft and facing one end of the rotating shaft. , the hard ball blocking screen faces the one end of the rotating shaft, and a disk is fixed to the one end of the rotating shaft in close proximity to the hard ball blocking screen so as to cover the hard ball blocking screen. A plurality of blades are provided on the surface of the disc facing the hard ball blocking screen, and the gap between the blades and the hard ball blocking screen is smaller than the diameter of the hard ball.

With such a configuration, hard balls will not enter the hard ball blocking screen,
It is centrifugally moved by the blades out of the hard ball blocking screen, so that the slurried workpiece can be easily fed through the hard ball blocking screen and into the container. As a result, a high viscosity slurry can be supplied, so that the pulverization efficiency can be significantly increased.

Further, in the present invention, the blades may be arranged at equal angular intervals and may be provided on a disk so as to extend in the radial direction.

Embodiments of a ball mill according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a longitudinal cross-section of the vicinity of the inlet of the ball mill according to the present invention. The ball mill includes a cylindrical or polygonal container 1, one end of which is provided with an inlet 2, and the other end provided with an outlet (not shown). Further, inside the container 1, a rotating shaft 3 that is rotatably supported through one end wall of the container extends in the longitudinal axis direction of the container, and this rotating shaft 3 is not shown. It is adapted to be rotated by a drive device. The inlet 2 is formed at a position on the end wall 1a of the container so as to be concentric with the rotation axis 3 and facing the end of the rotation axis, and a hard ball prevention screen 4 having eyes smaller than the hard balls is placed on the rotation axis 3. It covers the inlet 2 and is fixed to the end wall of the container around the inlet so as to face the end of the inlet.

A plurality of stirring members 5 are provided on the rotating shaft 3 located inside the container 1 at regular intervals in its longitudinal direction. As shown in the figure, the stirring member 5 may be composed of a disk 6 and a plurality of pins 7 embedded in its outer periphery and extending radially, or it may be a disk having a plurality of holes. A plurality of pins 8 are provided on the inner surface of the cylindrical wall of the container 2 and are located between the stirring members 5 and extend toward the rotation axis. Further, the plurality of pins 8 disposed in the circumferential direction between mutually adjacent stirring members 5 may be replaced with annular disks. Furthermore, there are many hard balls (not shown) in the container 1.
is included.

In such a configuration, a plurality of blades 10 are provided on the screen-side surface of the disc 6, which is attached to the end of the rotating shaft 3 by screws 9, and extend outward from the center. these blades 10
are arranged at equal angular intervals of 90 degrees and extend radially outward from the center, as shown in FIG. Furthermore, the distance G between the front surface of the blade 10 on the screen side and the screen 4 is smaller than the diameter d of the filled hard balls, preferably in the range of 0.3d to 0.5d.

In the ball mill as described above, the rotating shaft 3 is rotated to feed the slurry of solid particles of the material to be processed into the inlet 2.
When the solid particles are supplied under pressure, the solid particles are fed into the container 1 through the hard ball prevention screen 4, and the solid particles are crushed by the hard balls being stirred by the stirring member 5 into fine particles, and then sent out from the outlet (not shown). It will be done.
At this time, even if the hard balls try to enter the hard ball screen 4, they are blocked by the narrow gap G, rotated by the rotating blade 10, and sent back out of the hard ball blocking screen by centrifugal force. Therefore, hard balls do not stay on the hard ball blocking screen, and even when a highly viscous slurry is pumped, there is no pressure loss due to the staying hard balls. Therefore, even a slurry with high viscosity can be easily supplied, and therefore, the grinding efficiency can be significantly increased by using a slurry with high viscosity. At this time, since the object to be treated is less than one-tenth the diameter of the hard ball, it is not obstructed by the blade at all.

As is clear from the above description, according to the present invention, a highly viscous slurry can be easily supplied. Therefore, the high viscosity slurry can significantly improve the processing efficiency of the object to be processed.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional view of the vicinity of the entrance of the ball mill according to the present invention, and FIG. 2 is a plan view of the disk taken along the line - in FIG. 1. 1... Container, 2... Inlet, 3... Rotating shaft, 4...
...Hard ball prevention screen, 5... Stirring member, 6...
Disc, 7, 8...pin, 9...screw, 10...blade.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical container provided with an inlet and an outlet for receiving a pressurized slurry processed material, and a cylindrical container that extends in the longitudinal direction of the container and is rotatable. a supported shaft, a plurality of stirring members fixed on the shaft at intervals in the longitudinal direction, a drive device for rotating the rotary shaft, and a large number of crushers housed in the container. a ball mill comprising hard balls that perform an action, and the inlet is provided with a hard ball blocking screen, the inlet comprising:
The hard ball blocking screen is disposed on the container concentrically with the rotation shaft and facing one end of the rotation shaft, and the hard ball blocking screen is opposite the one end of the rotation shaft, and A disk is fixed close to the hard ball blocking screen so as to cover the hard ball blocking screen, and a plurality of blades extending outward from a central portion are provided on a surface of the disk facing the hard ball blocking screen. furthermore, the gap between the blade and the hard ball blocking screen is made smaller than the diameter of the hard ball;
As a result, the hard balls that enter the hard ball blocking screen are moved out of the hard ball blocking screen by centrifugal force, and the slurry-formed material is easily supplied into the container through the hard ball blocking screen. A ball mill that is characterized by: (2) The ball mill according to claim 1, wherein the blades are provided on the disk at equal angular intervals. (3) The ball mill according to claim 1 or 2, wherein the blade is provided on the disc so as to extend in a radial direction.