JPH0683796B2 - Ball mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an arm member that is rotatable around a vertical axis, and a plurality of stirring members individually attached to an arm member, which are elongated along the vertical axis. The present invention relates to a ball mill which is formed in a shape and arranged so as to revolve around the vertical axis, and which is detachably provided in a container for accommodating an object to be processed and crushing balls for batch processing.

[Conventional technology]

Conventionally, as shown in FIG. 6, all of a large number of arm members (27) are located in the filling layer of the object to be processed and the ball on the vertically driven drive shaft (26) arranged in the container (25). And the stirring member (28) was erected on each arm member (27) (see, for example, Japanese Patent Publication No. 45-22280).

[Problems to be Solved by the Invention]

However, it has a drawback that it cannot be finely pulverized sufficiently, the pulverization processing speed is slow relative to the power consumption, and the balls are abraded severely. Moreover, when the object to be processed is taken out of the container after the batch processing is completed, the arm material with the stirring member is first taken out from the lid opening part of the upper part of the container, and then the remaining object to be processed and the crushing balls I try to get out, but
In such an operation of taking out the object to be processed, when the arm material with the stirring member is taken out, the existence of the object to be processed and the crushing balls filling the arm material with the stirring member becomes a resistance, and the stirring member There was also a drawback that the work of taking out the attached arm material was very troublesome.

The purpose of the present invention is to investigate the cause of the above-mentioned conventional drawbacks, to perform sufficient crushing quickly and with less power, and to reduce the abrasion of the crushing balls. There is a point to be able to improve.

[Means for Solving the Problems]

The characteristic structure of the present invention is that it can be driven and rotated around the vertical axis,
All of the arm members attached so as to revolve the elongated stirring member along the vertical axis are arranged above the object to be treated and the crushing ball in the container, and the plurality of stirring members are respectively linear at the tip side. In addition to being hung from the arm member in a rod-like independent state, the arm member and the container are arranged around a cylindrical or rod-shaped member provided on the vertical axis, and the action and effect are as follows. Is the street.

[Action]

In summary, in order to elucidate the cause of the above-mentioned conventional defects, various types of stirring tools were prepared, and comparative experiments were conducted on the performance of these stirring tools. All or part of the arm material was treated in the container and the ball. Rotating in the packed bed of No.2 consumes a lot of power, slows the crushing speed, and causes severe wear of the balls, whereas placing all the arm members above the object and balls is extremely effective. Moreover, it has been found that sufficient crushing can be performed quickly while suppressing power consumption, and that ball wear can be suppressed. Moreover, when the object to be processed is taken out of the container after the batch processing is completed, the arm material with the stirring member is first taken out from the object to be processed and the crushing balls, and then the remaining object to be processed and the crushing ball are crushed. Even if the ball is taken out, all of the arm members are arranged above the object to be processed and the ball for crushing in the container, and the object and object for crushing are elongated along the vertical axis. Since only the shaped stirring members are buried in a hanging posture with their tip sides independent of each other in a straight rod shape, it is easy to take out the stirring members hanging from the arm material from the object to be processed and the crushing balls with less resistance. Will be able to.

Furthermore, when we examined what measures should be added to enable sufficient fine pulverization in a short time,
In addition to simply placing all of the arm members above the object to be processed and the ball, in addition to this, a plurality of stirring members are suspended from the arm members with their tip ends independent of each other, and the arm members and the container are moved vertically. Arranged around a cylindrical or rod-shaped member provided on the shaft core so that the object to be treated is not accommodated by the action of the cylindrical or rod-shaped member on the center side of the container where the stirring action of the stirring member is small. Then, it was found that a strong shearing force by the balls can be surely applied to the entire amount of the object to be treated, further fine pulverization can be realized, and fine pulverization can be efficiently performed in a short time.

By the way, as will be described in detail later in Examples, a ball mill (comparative example) in which arm members are simply arranged above the object to be processed and balls, and in addition, a stirring member is provided around a cylindrical or rod-shaped member. Using the arranged ball mill (example of the present invention),
When silica sand having an average particle size of 30 μm is used as the object to be treated, in the comparative example, the average particle size is crushed to about 2 μm no matter how long the processing time is, but in the present invention example, the average particle size is about 1 hour. It can be about 1 μm, and the average diameter can be about 0.7 μm if it takes about 3 hours, further pulverization is possible,
Sufficient pulverization was achieved in a short time.

〔The invention's effect〕

As a result, sufficient fine pulverization can be performed with good power efficiency and efficiency, power cost and ball replacement cost can be reduced, and workability at the time of taking out the object to be processed can be improved. It has become possible to provide a ball mill that is dramatically superior to conventional ones in terms of cost, workability, and management.

〔Example〕

 Next, examples will be shown.

As shown in FIGS. 3 and 4, the upper case (3) is attached to the lower case (2) having the wheels (1) so as to be vertically swingable around the hinge (4), and the container (5) is attached. For attaching contents to the bracket (2a) of the lower case (2) so that the contents can be taken out freely by rotating around the support shaft (6), and for fixing the container (5) in a crushed state in which the opening thereof is directed almost vertically upward. A fixing tool (7), for example, a tool for tightening the bracket (2a) with bolts and nuts attached to the container (5) is provided so that the fixing operation can be freely performed.

A rotating spindle (9) having a lower end of a stirring tool (8) to be placed in the container (5) is attached to the upper case (3) so as to be oriented almost vertically during stirring, and a belt or the like is attached to the rotating spindle (9). The output shaft (12) of the electric motor with a transmission (M) attached to the lower case (2) is attached to the rotary shaft (11) attached to the upper case (3) by interlocking with the winding transmission tool (10). , Upper case (3)
The clutch (13) is attached and detached in association with the vertical swing of the. An operation handle (14) for the transmission, and an operation box (15) having switches and meters for starting / stopping the motor (M) are attached to the lower case (2).

That is, the container (5) is fixed in a crushed state, the upper case (3) is lowered, the agitator (8) is placed in the container (5), and the object to be processed and the crushing balls are placed in the container (5). Fill to the appropriate level (eg 60-70% of the container height) and
Attach the split lid (16) to the container (5), and set the motor (M).
Thus, the stirring tool (8) is rotated at an appropriate speed (for example, a stirring action speed of 2 to 3 m / sec) so that the object to be treated is crushed by the action of balls. When the crushing is completed, the agitator (8) is stopped, the lid (16) is removed, the upper case (3) is raised, and the container (5) is rotated to treat the object to be processed and the ball container (5). It is configured to be taken out from.

As shown in FIGS. 1 and 2, the cooling water supply hose (17
cooling jacket (1) connected to a) and drain hose (17b)
8) is formed in the container (5) so that the temperature rise in the container (5) due to crushing can be suppressed.

Further, the stirring tool (8) has a slender shape stirring along the vertical axis (P) of an arm member (8a) attached to the rotary support shaft (9) and rotatable around a vertical axis (P). The members (8b) are fixed in a drooping posture in a state in which the members (8b) are arranged on the same circumference around the vertical axis (P) at substantially equal intervals, and the tip ends of the members (8b) are independent linear rods. 8a) is arranged above the object to be treated and the balls in the container (5), and the stirring member (8b)
It is configured to revolve around only the vertical axis (P) inside the filling layer of the object to be treated and the balls, so as to efficiently pulverize and suppress the wear of the balls. Further, when the object to be treated is taken out from the ball container (5), only the elongated stirring member (8b) along the vertical axis (P) is placed in the object to be treated and the crushing ball, and the tip side is The arm member (8a) with the stirring member (8b) can be easily taken out from the object to be treated and the crushing ball, because the arm member (8a) is embedded in the shape of a straight rod in an independent state.

A rod-shaped member (1) provided with a stirring member (8b) in a container (5)
It is arranged around 9) so that the object to be treated is not accommodated by the action of the rod-shaped member (19) on the center side of the container (5) where the stirring action by the stirring member (8b) is small. A strong shearing force by the balls is surely imparted to the whole amount, so that further fine pulverization can be realized and the fine pulverization can be efficiently performed in a short time.

[Another embodiment]

 Next, another embodiment will be described.

The object to be treated is, for example, ferrite, food, metal powder, pigment,
Ink or other suitable ink can be selected.

For the balls, for example, steel, ceramics, glass, and other suitable materials can be selected, and the balls are set to a suitable size, generally about 1 to 10 mm, preferably 2 to 3 mm.

The shape and number of the arm members (8a) can be freely changed according to the number and arrangement of the stirring members (8b), and the stirring members (8b)
The number may be one or more, and the material, shape, arrangement, etc. can be appropriately selected, and for example, the stirring member (8b) may be distributed on a plurality of circumferences around the vertical axis (P).

Instead of the rod-shaped member (19), a cylindrical member (19) may be attached to the container as shown in FIG. 5 (a).
A rod-shaped member (19) or a tubular member (19) may be attached to the stirring tool (8) as shown in FIGS.

The posture of the stirring member (8b) can be appropriately changed, and for example, the inclined postures of the following (a) to (d) may be applied to part or all of the stirring member (8b) alone or in an appropriate combination. .

(B) Inclining so that the lower side is closer to the front side in the rotation direction.

(B) Inclining so that the lower side is closer to the rear side in the direction of rotation.

(C) Inclining so that the lower side is closer to the radial direction of rotation.

(D) Inclining so that the lower side is closer to the center of rotation.

The ball mill may be a wet type or a dry type, and the overall specific configuration can be appropriately changed. For example, the object supply path and the crushed material recovery path may be connected to the container (5) so as to be vertically and horizontally located on the opposite sides, so that wet crushing can be continuously performed.

[Experimental example]

 Next, an experimental example is shown.

(Experimental Example 1) A ball mill (comparative example) in which the arm material (8a) is simply arranged above the object to be treated and the ball, and in addition, a tubular or rod-shaped member (19) is attached to the container, and the member Using a ball mill (example of the present invention) in which a stirring member (8b) is arranged around (19), silica sand (test dust JIS class 2) as a material to be treated is wet pulverized, and pulverization time and average diameter ( 50% accumulated weight
Then, the results shown in FIG. 7 were obtained.

Incidentally, the average diameter of the raw silica sand was 30 μm, and in the present invention example, silica sand was 150 g, and the liquid medium (water) was 0.6 l,
Further, in the comparative example, silica sand was 460 g, and the liquid medium (water) was 0.84 l.

That is, according to the comparative example shown by the dotted line, the average diameter does not become about 2 μm or less over time, but according to the example of the present invention shown by the solid line, the average diameter becomes about 1 μm in about 1 hour and about 3 hours. Then, the average diameter became about 0.7 μm, and further fine pulverization was possible according to the present invention, and fine pulverization could be efficiently performed in a short time.

(Experimental Example 2) Silica sand similar to Experimental Example 1 was wet pulverized for 1 hour using a comparative example similar to Experimental Example 1 and an example of the present invention, and the particle size distribution was examined. The results are shown in FIGS. 8 and 9. The results shown were obtained.

That is, in the comparative example shown by the dotted line, the average diameter is 2 μm and the width of the particle size distribution is considerably wide, but in the example of the present invention shown by the solid line, the average diameter is 1 μm and the width of the particle size distribution is quite narrow, which is sufficient according to the present invention. Fine pulverization can be achieved with uniform particle size.

(Experimental Example 3) A comparative example similar to Experimental Example 1 and an example of the present invention were used.
When talc of m was treated as a material to be processed by wet pulverization for 1 hour and the particle size distribution was examined, the results shown in FIG. 10 were obtained.

That is, in the comparative example shown by the dotted line, the average diameter was 27 μm, but in the example of the present invention shown by the solid line, the average diameter was 2 μm, and according to the example of the present invention, sufficient pulverization can be realized.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a sectional view of an essential part, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a partially cutaway side view of the whole.
5 (a), (b) and (c) are cross-sectional views of essential parts showing other embodiments of the present invention. FIG. 6 is a sectional view of a main part of a conventional example. 7 to 10 are graphs showing the experimental results. (5) …… Container, (8) …… Stirrer, (8a) …… Arms,
(8b) …… Stirring member, (19) …… Cylindrical or rod-shaped member,
(P) ... Vertical axis core.

Claims (1)

[Claims] 1. An elongated shape in which each of a plurality of stirring members (8b) individually attached to an arm member (8a) that can be driven and rotated about a vertical axis (P) is provided along the vertical axis (P). To form
A ball mill, which is arranged so as to revolve around the vertical axis (P) and is detachably provided in a container (5) for accommodating an object to be processed and crushing balls for batch processing, the arm comprising: All of the materials (8a) are arranged above the object to be treated and the balls in the container (5), and the plurality of stirring members (8b) are respectively separated from each other by the arm members ( 8a) A ball mill which is hung from the arm member (8a) and the container (5) and arranged around a cylindrical or rod-shaped member (19) provided on the vertical axis (P).