JPS6230820B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrafine pulverizer in which the particle size of the pulverized product is several microns.

The first example of a pulverizer that is conventionally used as a pulverizer that performs ultrafine pulverization on the order of several microns is shown in the first example.
An overview will be given with reference to FIGS. As shown in FIG. 4, the rotor 2 has an upright cylindrical shape having a large number of protrusions 1 along the generatrix on its outer surface, and has a large number of protrusions 3 on its inner surface along the generatrix as shown in FIG. The stator 4, which has a cylindrical inner surface shape corresponding to the rotor 2, is fitted with a predetermined gap S between the surfaces of the respective protrusions 1 and 3, as shown in FIGS. 1 and 2. ing. The upper and lower end surfaces of the rotor 2 are respectively closed by an upper plate 5 and a lower plate 6, and the lower plate 6 is pivotally supported on a pedestal 7 of the machine and is rotationally driven by a drive motor (not shown) via a drive belt 8. It is fixed to the upper end of the vertical shaft 9. The upper and lower ends of the stator 4 are airtightly attached to an upper casing 10 and a lower casing 11, which are spaced from the upper and lower plates 5 and 6, respectively. In the space 12 surrounded by the bottom plate 6 and the lower casing 11,
Raw material supply pipe 1 provided between raw material supply port 13
4 is open, and a product discharge port 16 is provided in a space 15 surrounded by the top plate 5 and the upper casing 10. Raw materials are fed into the raw material supply port 13 from a raw material feeder (not shown), a discharge pipe (not shown) is connected to the product discharge port 16, and the discharge pipe is provided with product discharge means such as a blower.

Therefore, when the rotor 2 is rotated at high speed by the drive motor, the raw material is input into the raw material supply port 13, and the product discharge blower is driven.The raw material passes through the space 12 together with air and is transferred to the rotor 2 and the stator 4. It is introduced into the annular space between the rotor 2 and accelerated in the circumferential direction by the protrusions 1 of the rotor 2 rotating at a high speed, collides with the protrusions 1 and 3 of the rotor 2 and the stator 4, and is pulverized into a discharge blower. The air gradually rises on the upward airflow generated by the negative pressure caused by the air, passes through the space 15, and is discharged from the outlet 16 along with the wind.

In the above example, the outer surface of the rotor 2 and the inner surface of the stator 4 have a cylindrical shape, but may have a rotating body shape such as a truncated conical shape.

Now, in conventional crushers of the above type, the protrusions on both the rotor and stator are usually made of cast steel, cast iron, etc., integrally with the main body, as in crushers with large product particle sizes. Cast steel has excellent impact resistance, and is suitable for crushing machines that produce relatively large product particles, where large-grain raw materials collide, but due to its low wear resistance, it is suitable for crushing machines that produce a large number of fine particles, such as those used in ultra-fine crushers. When a raw material of a certain particle size collides with the ridges and is pulverized, it becomes like being sandblasted, and the ridges of the ridges that contribute to the pulverization wear out in a short period of time. When this part is worn out, the particle size of the pulverized product will vary; for example, if the product is used as a powder for cosmetics, it will become rough and lose its commercial value when applied to the skin. Classifying ultrafine powder of several microns is extremely difficult and costly, so it is highly desirable to produce products with uniform particle sizes using a single pulverizer.

This invention solves the above-mentioned problems of the conventional ultrafine pulverizer of the above-mentioned type, and even when performing ultrafine pulverization of several microns, there is little wear on the protrusions on the rotor and stator, and it lasts for a long time. A stable and good pulverized product can be obtained over a period of time, the life of the protrusions is long, and maintenance is easy.
The purpose of the present invention is to provide an ultrafine pulverizer that is easy to inspect.

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments thereof.

FIG. 5 is a longitudinal sectional view showing an embodiment of the ultrafine pulverizer according to the present invention, and as is clear from the figure, its configuration is generally similar to the conventional ultrafine pulverizer shown in FIG. 1. However, the rotor 20 and stator 30 are each divided into a plurality of annular members 21 and 31 in the axial direction, and these annular members 21 and 31 are stacked and arranged at appropriate pitches on the circumference. They are integrally connected by stay bolts 22 and 32.

Further, the protrusions 33 and 23 of the stator 30 and the rotor 20 are made as separate members from the stator main body 31 and the rotor main body 21, as shown in FIGS. Fitting grooves 34, 2 provided
4 and is removably fitted and fixed. The stator body 31 and the rotor body 21 are made of structural steel, cast steel, or cast iron, and the protrusions 33, 23 are made of ceramic with excellent wear resistance.

The length of the above-mentioned ceramic protrusions 33, 23 is the height of the annular members 31, 21 of each layer of the stator and rotor divided in the axial direction, and these are attached to each annular member 31, 21. In addition, by stacking and bonding, the protrusions 33, 23 are connected to the stator 3.
0 and the rotor 20, a continuous protrusion is formed over the entire length of the rotor 20.

The method of fitting and fixing the protrusions 23, 33 to the rotor or stator main body annular members 21, 31 is to form the protrusions 23, 33 in a trapezoidal cross section in the example shown in FIGS. Fitting groove 2 provided in members 21 and 31
The cross-sectional shape of numerals 4 and 34 is a trapezoidal cross-section that corresponds to the shape from the longer base of the trapezoid to a certain height. As a result, the protrusions 23, 33 are replaced by the grooves 24, 3.
4 can be fitted in the axial direction from one end to be attached and fixed to the main body.

In addition, as shown in FIG. 8, the protrusions 23 and 33 have rectangular cross sections, and the grooves provided in the main bodies 21 and 32 have rectangular cross sections with the same width, so that the protrusions are perpendicular to the rotor or stator surface. to fit into the groove, and hold both ends of the stepped presser member 3 made of ceramic.
5, it can also be mounted by fixing it with the presser plate bolt 36.

In the example shown in FIG. 9, the main body 31 is provided with a trapezoidal groove 34 similar to that shown in FIG. A flange 33a extending from side to side is provided.
FIG. 10 shows the method of fitting and mounting shown in FIG. 8 by introducing the concept shown in FIG. 9.

Alternatively, as shown in FIG. 11, the mounting groove 34 provided in the main body 31 may have a T-shaped cross section that widens at the back, and the protruding strip 33 may have a T-shaped cross section for fitting.

There is no difference from the conventional device except that the rotor 20 and stator 30 are divided in the axial direction as described above, and the protrusions are made into a separate member from the main body and made of ceramic.

Therefore, the grinding process is exactly the same as the conventional device detailed above. However, even if the protrusions 23 and 33 of the rotor 20 and stator 30 are continuously exposed to the blast of the pulverized raw material during the crushing process, the protrusions are made of ceramic, which has excellent wear resistance, so they will last for a long time. Only a small amount of wear occurs over the course of the process, which enables good ultrafine pulverization with little variation in particle size, and also improves the life of the protrusions.

After a certain period of operation, when carrying out maintenance inspections and replacing worn protrusions, the rotor and stator are divided into several layers in the axial direction, which makes handling easier, and the length of the protrusions is also short. This reduces the chance of breakage of protrusions made of brittle ceramic during transportation and assembly. Even if it were to break, the damage would be less than if the entire length were made in one piece. From the viewpoint of preventing breakage accidents, a cross-sectional shape with flanges on the left and right sides as shown in FIGS. 9 and 10 is advantageous in terms of bending and shear strength.

Although FIGS. 8 to 10 show examples of how the protrusions are attached to the stator, the illustrations are omitted since the method of attaching the protrusions to the rotor is the same.

As described above, the present invention stabilizes the grinding performance of an ultrafine grinder over a long period of time, contributes to improving product quality, and extends the life of the grinding section of the grinder, making maintenance inspections and parts replacement easier. Various effects such as ease of use can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of a conventional pulverizer, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a perspective view showing a part of its stator, and Fig. 4 is a longitudinal sectional view showing an example of a conventional pulverizer. FIG. 5 is a perspective view showing a part of the rotor, FIG. 5 is a vertical sectional view showing an embodiment of the pulverizer according to the present invention,
The figure is a perspective view showing a part of the stator, FIG. 7 is a perspective view showing a part of the rotor, and FIGS.
Each figure is a perspective view showing another example of how to attach the protrusions to the stator. 20... Rotor, 21... Rotor main body, 23... Convex strip, 30... Stator, 31... Stator main body, 33... Convex strip.

Claims (1)

[Claims] 1. A rotor having the shape of a rotating body having a large number of protrusions along the generatrix line on the outer surface is rotatably supported on a machine frame so as to be rotatable around a vertical axis, and a rotor having a rotor shape having a large number of protrusions along the generatrix line on the outer surface is rotatably supported on a machine frame, and a rotor with a large number of protrusions along the generatrix line on the inner surface. A stator having protrusions and an inner surface shape corresponding to the rotor is fitted in such a way that the surface of the protrusions is at a constant distance from the surface of the protrusions of the rotor, and the stator is stationary with respect to the rotating rotor. In an ultrafine grinder that feeds raw material between the grinder and the grinder and grinds it using the above-mentioned protrusions,
An ultrafine pulverizer characterized in that the above-mentioned protrusions are removably attached to the rotor body and the stator body, and the material thereof is ceramic. 2 The above-mentioned rotor and stator are each divided into a plurality of layers in the axial direction, and these layers are laminated and bonded together. The ultrafine pulverizer according to claim 1, characterized in that the ultrafine pulverizer is installed in parts.