KR19990073270A - A ball mill - Google Patents

Abstract

In the present invention, when the specific gravity difference between the raw material to be pulverized and the pulverized medium is not large and the viscosity of the raw material is large, as well as in the case of dry raw materials, separation between the finely pulverized material (about 0.03 to 0.1 mm) and the pulverized medium It provides a dry and wet combined ball mill made easy. Ball mill according to the present invention, the circumference is provided with a predetermined cooling means and the inside of the sealed body member is filled with a predetermined amount of grinding media; Raw material supply means which is provided at one end of the body member to supply a fixed amount of raw material; A stirring device installed inside the body member to stir and grind the raw material by the rotational force of the motor; A centrifugal separator attached to a rotating shaft of the agitator and rotating together with the centrifugal force and the suction force to separate and suck the pulverized material from the pulverized medium by the centrifugal force and the suction force; And a classification aid supplying means for spraying the classification aid of the pulverized medium on the material sucked into one end of the centrifuge.

Description

Dry and wet combined ball mill {A ball mill}

The present invention relates to a dry and wet combined ball mill, and more particularly to a grinding media such as ceramic balls, glass beads, metal balls, etc. while continuously supplying a slurry-type raw material or a dry raw material into the mill body. It relates to a ball mill which is stirred together to finely grind the raw material.

The grinding apparatus is classified into a continuous type for grinding while continuously supplying raw materials according to a raw material supply form, and a batch type for supplying and crushing raw materials by a predetermined amount, and also classified into wet and dry according to the supplied material conditions.

Among them, the batch type is supplied with a certain amount of slurry-type raw material (water + grinding material) from the upper part of the mill main body, like the attractor mill S type (manufactured by Union Press, USA), and then discharged to the lower part. The raw material is pulverized by stirring in an unpressurized state with the top of the open.

In the case of the continuous type, there are many known technologies, the most common of which is to supply the slurry-like raw material into the mill body, and grind the raw material by stirring under pressure with the grinding medium (for example, ceramic balls) in the mill body. , The pulverized material is separated from the pulverized medium and discharged.

This continuous mill is described with reference to FIG. 1 as follows.

Referring to the drawings, the mill body 10 is hermetically sealed, and a predetermined coolant pipe 12 is provided around the mill body to cool the heat generated by the body while the coolant is introduced and discharged during operation. In addition, the raw material supply means is provided with a hole in the lower portion of the mill body 10 and provided with a raw material supply port 20, the raw material supply control device 24 and the spring 26 around the inside of the mill body 10 It is configured to supply raw materials quantitatively. In addition, the rotor body 34 is installed in the mill body 10 as a stirring device, the rotary shaft 30 of which is inserted from the top of the mill body 10, and the rotary shaft 30 is connected to the motor through the motor connector 38. It is connected to the axis of rotation of (not shown in the figure). A centrifugal separator 32 is installed at the uppermost rotary shaft 30 in the mill body 10, and a through hole is formed in the rotary shaft 30 outside the mill body 10 to be connected to the centrifuge 32. In this case, reference numerals 12a and 12b denote coolant inlets and coolant outlets, respectively, 16 are closed ports and 40 are pulverized product outlets.

The conventional ball mill configured as described above is pulverized while the slurry-type raw material supplied into the main body 10 is stirred together with the pulverizing medium having a diameter of about 0.1 to 0.5 mm. Then, the pulverized raw material and the pulverized medium are sucked together by the centrifuge 32, and the pulverized material is sucked out by the centrifugal force, specific gravity, and weight difference, and is discharged to the pulverized product outlet 40, and the pulverized medium is sucked into the centrifuge 32. It will not be separated from the mill and will remain in the mill body (10).

However, in the case of using a very small diameter grinding media to finely grind the raw materials, the difference in weight between the ground and the grinding media is reduced, and in particular, the raw material is viscous or does not have a large specific gravity difference between the grinding media. In this case, there is a disadvantage in that separation between the pulverized material and the pulverized medium is difficult.

Therefore, an object of the present invention is that when the difference in specific gravity between the raw material to be crushed and the grinding medium is not large and the viscosity of the raw material is large, as well as in the case of dry raw materials, the finely ground material (about 0.03 to 0.1 mm) and the grinding medium It is to provide a dry and wet combined ball mill with easy liver separation.

1 is a cross-sectional view of a wet ball mill according to the prior art.

2 is a partially cutaway perspective view of a dry and wet ball mill according to the present invention.

3 is a cross-sectional view of the dry and wet ball mill according to the present invention.

Figure 4 is a cross-sectional view showing the operating state of the centrifuge of the dry and wet ball mill according to the present invention.

<Description of Symbols for Major Parts of Drawings>

10: main body 12: cooling water pipe

12a: cooling water inlet 12b: cooling water inlet

16, 44: airtight 18: ceramic ball

20: raw material supply port 22: raw material inlet

24: raw material supply regulator 26: spring

30: rotating shaft 32: centrifuge

32a: suction port 32b: through hole

34: rotor 34a: fixed stir bar

38: motor connector 40, 40a: powder discharge outlet

42, 42a: outlet 50: air supply pipe

52: air inlet 54: nozzle

Dry and wet combined ball mill for achieving the object of the present invention, a predetermined type of cooling means is provided around the hermetic body member is filled with a predetermined amount of grinding media; A raw material supply means which is provided at one end of the trunk member to supply a fixed amount of raw material to be crushed; An agitating device installed inside the body member and pulverizing the raw material while rotating by the rotational force of the motor; A centrifugal separator attached to the rotating shaft of the agitator to separate and suck the pulverized material inside the body member from the pulverized medium by the centrifugal force and the suction force which rotate while rotating together; And, it is characterized in that it comprises a classification aid supply means for continuously spraying a predetermined classification aid to the material that is provided at one end of the centrifuge.

Hereinafter, a dry and wet combined ball mill according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a partial cutaway perspective view of a dry and wet ball mill according to the present invention, Figure 4 is a cross-sectional view for showing the inside of the ball mill. Referring to the drawings, the ball mill is largely composed of a body member, a raw material supply means, a stirring means, a classification means and a discharge means.

The body member is provided with a coolant pipe 12 around the sealed cylindrical body 10, and the coolant pipe 12 is provided with a coolant inlet 12a and a coolant outlet 12b for supplying and discharging the coolant. . In addition, the lower part of the mill body 10 is a hole for installing the raw material supply means, a fixed stir bar (34a) is installed on the side to help crushing and stirring, the upper is formed a hole in which the rotating shaft of the stirring means is inserted It is. Although the fixed stirring rod 34a is shown in the figure, its installation configuration can be arbitrarily selected.

The raw material supply means is provided at the bottom of the mill body (10). Specifically, the raw material supply port 20 is attached to enclose and seal the lower hole of the mill body, and the raw material supply control device 24 is inserted from the inside of the mill body 10 to block the lower hole by the elastic force of the spring 26. It is provided. In addition, an inlet port 22 of the raw material supplied by pumping is formed in the raw material supply port 20.

The stirring means has a shape in which a plurality of rotors 34 are attached to the rotating shaft 30 inserted through the upper hole of the mill body 10. The rotor 34 is installed so as not to be in contact with the plurality of fixed stirring rods 34a attached to the inner side of the mill body 10 during rotation. And the rotating shaft 30 is provided with a motor connector 38 for receiving the rotational force of the motor not shown in the figure is installed outside the mill body 10, the upper end of the mill body 10 is provided with a centrifuge 32 The through hole 32b is drilled from the end of the rotary shaft 30 located outside the mill main body so as to communicate with the crushed material suction port 32a of the centrifuge 32.

On the other hand, there is provided a hole for inserting the rotary shaft 30 of the mill main body 10, that is, a seal 16 for sealing between the hole and the rotary shaft 30, the through hole at the end of the rotary shaft outside the mill main body 10 The pulverized product discharge port 40a which flows out through the 32b is provided.

As the classification means and the discharge means, the centrifuge 32 and the classification aid supply means described above are provided. An air supply pipe 50 is inserted into the through hole 32b of the rotating shaft 30 as the classification aid supply means, and a nozzle portion 54 is formed at the end of the air supply pipe, that is, at the inlet of the pulverized product of the centrifuge 32. It is. Here, air is used as the classification aid, but other gases or liquid substances which are not reactive with the pulverized product may be used. Reference numeral 44 is an airtight opening, and 42a is an outlet.

In the dry and wet combined ball mill of the present invention configured as described above, a raw material (slurry-type raw material or dry raw material) is first supplied to the raw material supply port 20 through the raw material inlet 22 by a metering pump, and the raw material supply port 20 ), The raw material supply regulator 24 is pushed into the wheat main body 10 by the internal pressure generated by the continuously introduced raw material is introduced into the wheat main body 10 by a predetermined amount. At this time, according to the internal pressure of the raw material supply port 20 of the raw material supply control device 24, the degree of pushing into the mill body 10 by the action of the spring 26 is automatically adjusted.

The raw material introduced into the mill main body 10 is filled into the mill main body 10 by stirring the fixed stirring rod 34a of the mill main body 10 and the rotor 34 of the rotating shaft 30 which receives the rotational force of the motor. It is mixed and pulverized with the ceramic ball 18, which is the pulverized medium (see FIG. 4). At this time, the degree of pulverization of the raw material depends on the diameter and the degree of filling of the filled ceramic ball 18. The raw material is supplied from the bottom of the mill body 10 while being mixed with the ceramic ball 18 and agitated in the process of pulverizing and moving to the upper side by the pressure of the raw material is continuously supplied centrifugal separator installed at the top of the rotary shaft ( 32) is reached and separated by the centrifugal force that rotates as it is sucked into the inlet 32a of the centrifuge 32 in a mixed state with the ceramic ball and the difference in specific gravity and weight of the ceramic ball 18 and the finely divided raw material pulverized material. The light pulverized product is discharged to the outside through the pulverized product discharge port 40a through the through hole 32b of the centrifuge and the rotating shaft 30, and the ceramic ball 18, which is heavier than the pulverized product, is pushed out of the centrifuge and pressed. It remains in the main body 10 (refer FIG. 4). At this time, the air supplied through the air supply pipe 50 is sprayed at a high pressure through the nozzle unit 54 installed around the suction port 32a of the centrifuge to help separate the mixture of the pulverized product and the pulverized medium. It is done.

As described in detail above, the dry and wet combined ball mill according to the present invention separates the raw material mill and the grinding medium in the ball mill by the centrifugal force, specific gravity, and weight, but does not react with a gas or liquid material as a classification aid. When the specific gravity difference between the raw material and the pulverizing medium is not large by spraying, fine pulverization and separation are easily performed even when the raw material has viscosity or dry grinding of the raw material.

Claims (2)

A hermetic body member having a predetermined cooling means in the circumference thereof and having a predetermined amount of a pulverized medium filled therein; Raw material supply means which is provided at one end of the body member to supply a fixed amount of raw material; A stirring device installed inside the body member to stir and grind the raw material by the rotational force of the motor; A centrifugal separator attached to a rotating shaft of the agitator and rotating together with the centrifugal force and the suction force to separate and suck the pulverized material from the pulverized medium by the centrifugal force and the suction force; And, dry and wet combined ball mill comprising a classification aid supply means for spraying the classification aid of the pulverized medium on the material is sucked to one end of the centrifuge. The dry and wet combined ball mill according to claim 1, wherein a plurality of fixed stirring rods protruding between the rotors of the rotating stirring apparatus are formed on the inner side of the body member.