JPH03217252A - Rotary mill - Google Patents

Abstract

PURPOSE:To remarkably shorten a time necessary for pulverization by providing the rugged stripes on the outer circumferential face of a rotary roll provided to a rotary trestle and on the outer circumferential face of the vessel of a rotary mill and generating vibration when the vessel of the rotary mill is rotated. CONSTITUTION:A rotary mill is equipped with both a rotary trestle having a pair of rotary rolls 10 which are parallel with each other and the vessel of a hollow cylindrical rotary mill which is placed on both rotary rolls 10 and rotatably moved by rotation of the rotary rolls 10. The rugged stripes are formed of the projected stripes 11 and a recessed stripe 12 provided in the interval thereof. The rugged stripes are provided to either of the outer circumferential faces of the rotary rolls 10 and the outer circumference of the rotary cylinder in the direction parallel to the rotary central axis. Or the ragged stripes in the direction parallel to this rotary control axis are provided in the intervals mutually different in the pitch on the outer circumferential faces of the rotary rolls 10 and on the vessel of the rotary mill.

Description

[Detailed description of the invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a rotary mill for dry or wet pulverization of powder. (Prior Art) Conventionally, when powder is pulverized, a pair of rotating rolls 1.1 are horizontally mounted in parallel as shown in FIGS. A rotary mill is used, which consists of a pedestal A and a rotary mill container B (also known as a rotary cylinder or pot) that is loaded on both rotating rolls 11 of this rotary pedestal A and rotated by the rotation of the rotary rolls 1. .

The rotary roll 1 of this conventional rotary mount A has a cylindrical shape with a smooth surface, has flanges 1a and la protruding from both ends, and rotates a motor 2 via a pulley 3 and a belt or chain 4. It is now possible to convey.

Further, in the conventional rotary mill container B, roll contact rings 5.5 are fixed to the outer periphery of both ends of a container body 4 having a hollow cylindrical shape, an opening is provided at one end of the container body 4, and a lid 6 is attached to a screw 7. It is fixed in a removable manner and can be opened and closed. In addition, when using it, put the powder to be crushed into a rotary mill container B, a crushing medium called cobbles, and in the case of wet grinding, an appropriate amount of a dispersion medium such as water or alcohol, and place it on the rotating stand A. Rotate it. This rotation causes the boulders to rub against each other with the powder in between, and the powder is finely ground when the boulders are lifted to a certain height and fall.

(Problems to be Solved by the Invention) Such conventional rotary mills have problems in that they are easy to operate and handle, and that it takes a lot of time to pulverize. In view of these conventional problems, the present invention has been made with the object of providing a rotary mill that can efficiently perform pulverization in a shorter time.

(Means for Achieving the Object) The inventors of the present invention have repeatedly devised and experimented with the shape of a rotary mill that can perform fine pulverization in a short time, and as a result, have incorporated vibration motion in addition to conventional rotation motion. We obtained the knowledge that fine pulverization is accelerated by the process of pulverization, and conducted further research to arrive at the present invention.

The gist of the present invention is, firstly, a rotating frame having a pair of rotating rolls parallel to each other; A rotary mill comprising a rotary mill container, characterized in that an uneven strip is provided on either the outer circumferential surface of the rotary roll or the outer circumference of the rotary barrel in a direction parallel to the central axis of rotation thereof. The rotary mill has a rotary pedestal having a second pair of rotary rolls parallel to each other, and a hollow cylindrical rotary mill container loaded on both of the rotary rolls and rotated by the rotation of the rotary rolls. The rotary mill is characterized in that the outer circumferential surfaces of the rotary roll and the rotary mill container are provided with concave and convex stripes parallel to the central axis of rotation at different pitches from each other. .

Note that the width, interval, and height of the uneven stripes are appropriately selected depending on the periodic amplitude of vibration to be applied to the rotary mill container.

(Function) The rotary mill of the present invention configured as described above accommodates powder, cobblestones, and necessary dispersion medium in a rotary mill container, and rotates the powder on a rotating stand, thereby distributing the space between the cobblestones in the same way as in the past. As the powder rubs against each other and falls, the powder becomes even finer. Furthermore, in the present invention, since the rotating mill container and/or the rotating roll have uneven surfaces, the rotating mill container vibrates while rotating. This vibration increases the number of times the stones rub against each other and between the stones and the inner surface of the rotating mill container, and as a result, the time required for fine pulverization is shortened.

Furthermore, when providing uneven stripes on both the rotary mill container and the rotating roll, it is necessary to vary the pitch of the uneven stripes between the two, since vibration will not occur if the uneven strips between the two are engaged like gears.

(Example) Next, an example of the present invention will be described with reference to FIGS. 1 to 6. Note that explanations of the same parts as in the conventional example described above will be omitted. FIG. 1 shows a rotating roll IO in the present invention,
This rotating roll 10 is constructed by pasting a rubber band in the direction of the rotational axis on the quarter line of the outer periphery, and forming convex strips 11, 11... and concave strips 12, 12... between them. It forms uneven stripes. On this rotating roll, as shown in Figure 2,
A rotary mill container B similar to the conventional one with a smooth surface is loaded to form a rotary mill. FIG. 3 shows a rotary mill container 13 according to the present invention, and this rotary mill container 13 has a rubber band attached on the eighth equal dividing line of its outer periphery, and a convex strip 1 parallel to the axis.
4, 14... and grooves 15, 15...
It forms an uneven strip consisting of... As shown in FIG.
A rotary mill is constructed by loading the product onto a rotating stand using 1. In addition, as shown in FIG. 5, the rotating roll 1 shown in FIG.
The rotary mill container 1 shown in FIG.
3 may be loaded to form a rotary mill.

Comparative Test Invention Example 1 A container with a width of 3 an and a length of 2 was placed on the outer periphery of an alumina rotary mill container body with an internal volume of 2 J (outer diameter of 18 cm, length of 20 am).
A rotary mill container was made by pasting rubber of 0aI1 and thickness of 3 cities on the 8th dividing line at equal intervals, as shown in Fig. 3.

In this, 500 g of feldspar powder with a uniform particle size of 50 μm, 2 kg of alumina holes with a diameter of 10 mφ, and 500 g of water were added.
111, put the lid on, and place it on a conventional rotary mill stand.
Grinding was carried out at a pot rotation speed of 100 γpm. A small amount of slurry was taken out from the mill at predetermined intervals, and the 10-uniform particle size was measured using a natural sedimentation type particle size distribution analyzer (Cetigraph, Micromeritics).

Invention Example 2 On one side of a rotating roll with a diameter of 6 clI+, a width of 2 cm and a thickness of 2
A rotary mill mount was made by attaching lIlm rubber plates on quarter lines at equal intervals as shown in FIG.

On top of this is an internal volume of 2.0 containing the same contents as in Invention Example 1.
A conventional rotary mill container made of alumina (outer diameter 18 mm, length 20 mm) was placed thereon, and pulverization was carried out to a particle size of 100 .gamma.pm.

Comparative Example The same contents as in Inventive Example 1 were put into an alumina rotary mill container with an inner volume of 21 cm (outer diameter 18 clI, length 20 cm) with no unevenness on the outside, and placed on a conventional mill stand.
Grinding was carried out at a rotational speed of m.

The test results of the invention examples 1 and 2 and the comparative example described above were as shown in FIG. From this result, it was found that both Inventive Examples 1 and 2 had a smaller average particle diameter in a shorter time than the Comparative Example.

(Effects of the Invention) As described above, the rotary mill of the present invention is provided with uneven stripes on the outer circumferential surface of the rotary roll of the rotary stand and on the outer circumferential surface of the rotary mill container, so as to generate vibrations when the rotary mill container rotates. By doing so, the time required for pulverization was significantly shortened compared to the conventional method, and work efficiency was improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing a rotating roll according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a combination of the rotating roll and a rotating mill container, and FIG. 3 is a rotating shaft according to a second embodiment of the present invention. FIG. 4 is a sectional view showing a combination of the rotating mill container and rotating roll; FIG. 5 is a sectional view showing a combination of the rotating roll and rotating mill container of the third embodiment; FIG. The figure is a graph showing the comparative test results of the rotary mill of the present invention and the conventional rotary mill, Figure 7 is a front view of the conventional example, and Figure 8 is A in Figure 7.
-A sectional view. A... Rotating stand, B... Rotating mill container, 10... Rotating roll, 11.14...
・Convex strip, 12.15... Concave strip, 13...
・Rotating mill container.

Claims (2)

[Claims] (1) A rotary mill comprising a rotary stand having a pair of rotary rolls parallel to each other, and a hollow cylindrical rotary mill container loaded on both of the rotary rolls and rotated by the rotation of the rotary rolls. A rotary mill characterized in that an uneven strip is provided on either the outer circumferential surface of the rotary roll or the outer circumference of the rotary drum in a direction parallel to the central axis of rotation thereof. (2) A rotary mill comprising a rotary stand having a pair of rotary rolls parallel to each other, and a hollow cylindrical rotary mill container loaded on both of the rotary rolls and rotated by the rotation of the rotary rolls. A rotary mill characterized in that the outer circumferential surfaces of the rotary roll and the rotary mill container are provided with concave and convex stripes extending parallel to the central axis of rotation and spaced at different pitches.