JPH02303549A - Method for operating centrifugal fluidized crushing device - Google Patents

Abstract

PURPOSE:To suppress the generation of the cushion layer on an inside surface for crushing and to enhance a crushing effect and to simultaneously pulverize crushed raw materials by mixing crushing media having irregular shapes exclusive of a spherical shape as crushing media with the raw materials. CONSTITUTION:A freely rotatable disk-shaped rotary tray 2 has a tray surface 2A, the axial center of rotation of which faces the vertical direction and at least the central part of which expands downward. In addition, the vertical section of the tray surface 2A is formed to the shape curving to a recess. The stationary ring 1 has the inside wall surface 1A which is diametrally reduced upward in at least the upper part. The vertical section of the inside wall surface 1A is formed to the shape curved to a recessed shape. The stationary ring is provided circumferentially and coaxially with the rotary tray 2 and is held static. The tray surface 2A of the rotary tray 2 and the inside wall surface 1A of the stationary ring 1 form a continuous smooth surface exclusive of a slight spacing 29 between the rotary tray 2 and the stationary ring 1. The crushing media having the irregular shapes exclusive of the spherical shape are mixed as the crushing media with the raw materials. As a result, the pulverization of the crushed raw materials is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a crushing device. More specifically, the present invention relates to a centrifugal fluid pulverizer that is equipped with an outer ring and a rotary plate and that pulverizes raw materials by centrifugally flowing a pulverizing medium having an irregular shape housed inside the device.

[Prior Art] There are various types of crushing devices such as tube mills and vertical mills, but by installing a rotating plate facing upward and rotating this rotating plate, the steel balls or ceramics housed inside can be crushed. Grinding media such as poles (hereinafter referred to as poles)
A so-called vertical ball mill is known in which the raw material is pulverized and milled by one-ring motion of the ball mill.

This type of vertical ball mill, which has been used for a long time, has problems such as weak grinding and grinding effects, or energy input into the device is easily consumed for purposes other than grinding and grinding, resulting in low energy efficiency. there were.

Therefore, the present applicant filed a patent application for a centrifugal fluid pulverizer having a rotating plate and a fixed ring as described below. (Special application 1986
-265379.60-266867~266872.
61-99745 etc.).

The axis of rotation of this rotating plate is oriented vertically.

It is a rotatable dish-shaped object having a dish surface whose diameter expands downward at least in the central portion, and a vertical section of the dish surface is curved in a concave shape.

The fixed ring has an inner wall surface whose diameter decreases upward at least in the upper part, and a vertical cross section of the inner wall surface is curved in a concave shape, and is disposed coaxially around the rotary plate and is stationary. ing.

In the centrifugal flow device, the plate surface of the rotating plate and the inner wall surface of the fixed ring are formed into continuous smooth surfaces except for a small gap between the rotating plate and the fixed ring.

[Problems to be Solved by the Invention] However, some of the pulverized raw materials have physical properties that make them particularly sticky, and even if these materials are pulverized by a pulverizer, they do not adhere to the inner surface of the pulverizer or the wall surface of the pulverizer. Since it forms a coating layer, there are inconveniences such as not being able to discharge it out of the grinding device, and there is also the problem that even if it is separated from the grinding inner surface or wall surface by some method, it is not possible to reduce the particle size below a certain level. It was very difficult to obtain fine powder.

[Means for Solving the Problems] In the operating method of the present invention, the rotation axis is oriented in the vertical direction, and at least the central portion has a dish surface whose diameter increases downward, and the diameter of the dish surface is A rotatable circular rotary plate having a concavely curved vertical cross section, and an inner wall surface whose diameter decreases upward at least at the upper part, and the vertical cross section of the inner wall surface is curved concavely. shape,
A stationary ring is provided coaxially around the rotating plate and is stationary, and the plate surface of the rotating plate and the inner wall surface of the fixed ring are in contact with each other, except for a minute gap between the rotating plate and the fixed ring. Therefore, in a method of operating a centrifugal fluid pulverizer that is formed on a continuous smooth surface, we adopted an operating method that mixes pulverizing media with irregular shapes other than spherical as the pulverizing media.

Then, the grinding media, which has an irregular shape, is cubed.

It was either a rectangular parallelepiped, a zero cylinder, or a polygonal pyramid.

[Function] In the operating method of the centrifugal fluid grinding apparatus of the present invention, a grinding medium 1 having an irregular shape, such as a cube or a rectangular parallelepiped, is used as the medium of a spherical pole made of steel balls or ceramics.

Since the grinding medium is mixed with cylinders, polygonal pyramids, etc.,
When pulverizing raw materials with extremely adhesive physical properties, the pulverized fine powder may adhere to the pulverizing surface or inner wall surface, but the edges of the irregularly shaped pulverizing media mixed in the pulverizing media may The edge portions slide against these portions and exert a peeling action, thereby inhibiting the growth and development of adhesion. Therefore, effective pulverization can be continued and the required fine powder can be obtained.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is an overall side view of the centrifugal fluid pulverizer, and FIG. 2 is a vertical sectional view of the main parts. Fig. 3 is a schematic perspective view of various irregularly shaped grinding media, Fig. 4 is a relational diagram showing changes in grinding amount over time;
FIG. 5 is a diagram showing the relationship between the mixing ratio of irregularly shaped media and the crushing capacity.

In the figure, numeral 1 is a fixed ring, and 2 is a rotating plate. The fixed ring l is fixed on the upper side of a drum-shaped casing 4 whose bottom surface is sealed with a plate 3, and the plate 3 is supported by a pedestal 5. A support block 6 is fixed on the zero-rotation plate 2, The support block 6 is supported by the plate 3 via a bearing device 7. That is, 1. An opening 8 is formed in the center of the plate 3, and a flange 10 of the bearing housing 9 is engaged with the edge of the opening 8 and fixed by a port 11. A drive shaft 12 is connected to the lower side of the support blow 2 6, and the drive shaft 12 is connected to an output shaft 15 of a reduction gear 14 via a joint 13. Reference numeral 17 is a variable speed motor for driving, which has a deceleration speed of 4.
It is connected to 11!14.

A lid member 18 is attached to the upper side of the rotary plate 2.

The lid member 18 is provided with a flange 19 on the outer periphery of its lower end, and the flange 19 is placed on a flange 20 protruding from the outer periphery of the upper end of the fixed ring 1, and is fixed by a port 21. A discharge pipe 22 is installed in the center of the lid member 18, and inside the discharge pipe 22 is a fixed ring 199 rotating 2 and a lid member 1.
It communicates with a chamber 23 for crushing or reforming (hereinafter referred to as a crushing chamber) surrounded by 8. The lid member 18 is provided with an input pipe 24, and the inside of the input pipe 24 is a crushing chamber 23.
It communicates within.

Next, the configurations of the fixed ring 1 and the rotary plate 2 will be explained in detail with reference to FIG.

The fixed ring 1 has an annular shape installed with the axial direction in the vertical direction, and the diameter is widest at the middle part (hereinafter referred to as the middle part) 1b in the height direction. The fixed ring 1 has the middle part 1b
The lower part (hereinafter referred to as "lower part") IC is slightly reduced in diameter downward, and the upper part (hereinafter referred to as "upper part) 1a from the middle part is reduced in diameter upwardly. Therefore, the inner wall surface IA of the fixed ring 1 extends from the lower IC to the middle part 1b.
The diameter slightly expands towards the center, and the middle part 1b is approximately vertical.
It has a shape that decreases in diameter from the middle part 1b toward the upper part 1a,
Moreover, the longitudinal section of the inner wall surface IA is curved in a concave shape. A flange 25 is protruded from the outer circumferential surface of the middle portion 1b of the fixed ring 1, and the flange 25 is placed on a flange 26 protruding from the outer periphery of the upper end of the casing 3, and is fixed by a port 27.

The plate surface 2A of the rotary plate 2 has a shape whose diameter increases downward at the central portion 2a, is approximately horizontal at the intermediate portion 2b continuing from the central portion, and has an outer circumferential portion 2C continuing from the intermediate portion 2b. In this case, the diameter expands upward. This plate surface 2A is curved concavely as a whole, and the inner wall surface LA of the fixed ring 1 and the plate surface 2A are connected to the fixed ring 1 and the rotary plate 2.
A continuous smooth surface is formed except for a small gap 29 between the two.

A pointed cap 30 is attached to the central portion of the rotary plate 2 and fixed by a port 31.

A shaft hole 32 is bored in the center of the rotary plate 2, and the upper end of the support block 6 is fitted into the shaft hole 32. The lower end of the port 31 is screwed into a piece 33 provided at the upper end of the support block 6.

Although not shown, liners are attached to the inner wall surface IA of the fixed ring 1 and the plate surface 2A of the rotary plate 2, respectively.

The plate 3 is provided with an inlet 34 for introducing gas such as air, and the gas is introduced into the gas chamber 3 in the casing 4 through a pipe 35.
6 can be introduced.

Further, a powder collecting means (not shown) such as a pack filter is connected to the discharge pipe 22.

Next, a description will be given of the process of pulverizing a pulverized raw material made of an adhesive substance using the centrifugal fluid pulverizer configured as described above.

In advance, the grinding chamber 23 is charged with a mixture of a grinding medium consisting of, for example, spherical poles and a grinding medium having an irregular shape, for example, a cube. First, as the 0-rotation tray 2 rotates, the pulverized raw material and the pulverizing medium circulate between the inner wall surface IA of the stationary ring 1 and the tray surface 2A (arrow S) as the 0-rotation plate 2 rotates to feed the pulverized raw material into the device from the input pipe 24. A spiral motion (centrifugal flow) similar to that of a rope is created by combining the motion and the revolving motion around the axis of the rotary plate 2, and the pulverized raw material is ground or stripped during this time.

That is, when the rotary plate 2 is rotated, the grinding medium is moved in the outer circumferential direction by centrifugal force, and crawls up the inner wall surface IA of the fixed ring 1 due to this velocity energy.

When the creeping force becomes smaller than gravity, the grinding medium that has moved onto the plate surface 2A of the rotary plate 2 leaves the inner wall surface IA and falls onto the plate surface 2A of the rotary plate 2 again along the plate surface 2A. It is then moved to l.

Further, when the rotary plate 2 is rotated, the grinding medium revolves in the circumferential direction at a speed slower than the rotational speed of the rotary plate 2. Therefore, as described above, the grinding medium is divided into the dish surface 2A and the inner wall surface IA.
In addition to the circular motion S in the vertical direction that circulates, it also performs the orbital motion that rotates around the axis of the rotary plate 2, and the combination of these two motions creates a spiral movement similar to tying a rope (centrifugal flow).
Do the following.

In this way, the grinding medium moves up the inner wall surface IA while maintaining its movement in the circumferential direction of the rotary plate 2. When the inner wall surface IA is fixed, the grinding medium moves up the circumferential direction of the rotating plate 2. The composite speed of the directional speed (revolution speed) and the creeping speed of the grinding medium directly becomes the speed difference between the inner wall surface IA and the grinding medium. Therefore, the speed difference between the grinding medium and the inner wall surface IA becomes extremely large, and the grinding action of the grinding medium when moving on the inner wall surface LA becomes extremely strong.

Furthermore, since the grinding media that has separated from the inner wall surface LA and landed on the dish surface 2A smoothly rolls down along the dish surface 2A, the movement when moving down the dish surface 2A lowers the inner wall surface IA. Since the drive unit can convert the potential energy obtained during upward movement into kinetic energy in the radial direction, the energy once applied to the grinding medium can be effectively used for the peeling action without wasting it. . Furthermore, when descending along the dish surface 2A, the grinding media
Since it slides on the surface, grinding or peeling occurs even during this downward movement.

The above-mentioned crushing action in the crushing chamber is suitable for hard and brittle materials such as ceramics, but
When grinding highly adhesive materials, such as limestone, mirabilite, alumina, magnesium oxide, and zirconia (manufactured by synthetic methods), as the grinding progresses, these fine powders may be deposited on the grinding surface of the grinding device or Since it adheres to the inner wall surface, in this example, the litchi surface of the rotating plate or fixed ring, and grows and develops, further crushing does not proceed, and the adhering layer acts as a cushion layer, weakening the crushing force, and the crushing device system. This causes problems in crushing, such as restricting the discharge to the outside.

However, in the present invention, in addition to the usual spherical pole made of steel or ceramics, a grinding medium having an irregular shape such as a cube is also charged into the apparatus.

During the spiral movement of the centrifugal fluid pulverizer described above, the pulverized raw material adhering to the inner surface of the pulverizer is scraped off by sliding along the pulverizing inner surface of the edges (corners) and ridge lines of these cubes, acting as a scraper. It will be done. Therefore, even if the pulverized raw material adheres to the inner surface of the pulverized material, its growth and development are inhibited, and the formation of the above-mentioned cook layer is also inhibited, thereby improving the pulverizing efficiency.

Figure 4 shows the change over time in the amount of grinding for only the spherical pole (A in the figure) and for mixed media with irregular shapes (φB in the figure), showing that B is clearly superior to A, and B shows a significant decrease in capacity. Not yet.

FIG. 3 shows typical examples of irregularly shaped grinding media that can be used in the present invention; (a) is a cube, (b) is a rectangular parallelepiped, (c) is a cylinder, (d) is a four-sided pyramid, and (e) is a rectangular parallelepiped. is a polyhedron (6
(hedron), (f) represents a curved surface, and (g) represents a polyhedron (diamond shape).Anything that has knees, ridges, or ridges can also be used as the irregularly shaped grinding medium of the present invention. It is possible.

The mixing ratio of the irregularly shaped medium to the spherical medium can be selected from 10 to 60%, with the total being 100%.

Figure 5 shows the relationship between mixing ratio and crushing capacity, approximately 35%.
The best results were shown when

The pulverization proceeds as described above, and the discharge of the material after the pulverization is as follows. That is, piping 3
5. An appropriate amount of air is introduced into the grinding chamber 23 from the gas chamber 36 and the gap 29.

When the above-described centrifugal fluid pulverization is continued for a certain period of time, the 5 pulverized raw materials are separated by grinding or peeling, and the fine powder is carried out from the discharge pipe 22 together with air. Note that a classifier may be provided at the top of the centrifugal flow device of the present invention to discharge only the required fine powder.

Note that since gas is blown from the gap 29 into the pulverized raw material and the pulverizing medium that are being subjected to centrifugal flow pulverization, the fine powder of the pulverized raw material is immediately conveyed by airflow and discharged. Therefore, the fine powder once peeled off does not adhere to the base material again.

Of course, air can also be introduced into the grinding chamber 23 by suction from the discharge pipe 22 instead of by blowing air from the pipe 35.

In this way, a highly adhesive pulverized raw material can be reliably pulverized, and a highly purified pulverized raw material can be efficiently obtained.

[Effects of the Invention] As explained above, since the operating method of the centrifugal fluid pulverizer of the present invention mixes the pulverizing media with irregular shapes into the pulverizing media, cleaning to remove the coating layer adhering to the inner surface of the pulverizer is necessary. This is effective, thereby suppressing the formation of a shoe 21 layer on the inner surface of the pulverized material, thereby increasing the pulverizing effect and at the same time improving the pulverization of the pulverized raw material.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the centrifugal fluid pulverizer, wIJz is a vertical cross-sectional view of main parts, Fig. 3 is a schematic perspective view of various irregularly shaped grinding media, and Fig. 4 is a relationship showing changes in grinding amount over time. line diagram,
FIG. 5 is a diagram M1 showing the relationship between the mixing ratio of irregularly shaped media and the crushing capacity. 1...Fixed ring, 2...Rotating plate, IA...Inner wall surface, 2A...Dish surface, 3
...Plate, 4...Casing, 14...Reduction gear, 17...
...Motor, 18...Lid member, 22...
...Discharge pipe, 23...Crushing chamber, 24
...Input pipe, 29...Gap. Patent applicant: Ube Industries, Ltd. Figure 1, Figure 31i! 17 (a) (b) (c) (d) (
e) (f) (9) Figure 4 Figure 5

Claims (2)

[Claims] (1) A rotatable motor whose rotational axis is vertically oriented, has a flattened surface whose diameter expands downward at least in the central portion, and whose vertical cross section is concavely curved. It has a circular rotating plate and an inner wall surface whose diameter decreases upward at least at the upper part, and the longitudinal section of the inner wall surface is curved in a concave shape,
A stationary ring is provided coaxially around the rotating plate and is stationary, and the plate surface of the rotating plate and the inner wall surface of the fixed ring are in contact with each other, except for a minute gap between the rotating plate and the fixed ring. A method for operating a centrifugal fluid pulverizer having a continuous smooth surface, the method comprising: mixing a pulverizing medium having an irregular shape other than a spherical shape as the pulverizing media. (2) Grinding media with irregular shapes are cubes, rectangular parallelepipeds,
2. The method of operating a centrifugal fluid pulverizer according to claim 1, wherein the pulverizer is one of a cylinder and a polygonal pyramid.