JPH0335978B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] In connection with functional materials, fine particles with diverse physical and chemical properties are becoming important in various fields such as electronic materials and fine ceramics. be.

The present invention relates to a pulverizer for producing such fine particles.

[Prior art] Conventional rod mills use elongated rods as grinding media, so the contact between the crushed material and the rods is limited to two times.
Mainly point (or surface) contact occurs, and the contact area is small, resulting in low pulverization efficiency.
This also applies to other grinding machines that use grinding media that have a substantially single structure.

[Problems to be Solved by the Invention] The technical problem of the present invention is to improve the configuration of the grinding media loaded in the grinding chamber, and to provide the grinding media and grinding with a simple structure while having substantially the characteristics of a rod mill. The aim is to increase the contact area with the material and improve the grinding efficiency.

[Means for Solving the Problems] In order to solve the above problems, the crusher of the present invention has the following features:
In a crusher, a cylindrical crushing chamber is loaded with a large number of disks whose thickness is sufficiently small compared to the diameter as a crushing medium, and each disk is loaded so that it can move independently. A single elongated cylinder is passed through a hole provided in the center with each disc movable independently, and a set of the grinding media is loaded into the cylindrical grinding chamber (first invention); Alternatively, the diameter of each of the above-mentioned disks is formed to be larger than half the diameter of the grinding chamber, and a number of these disks is loaded into the grinding chamber so that each disk does not fall sideways ((second invention) , consists of:

[Function] These crushers mainly utilize the friction phenomenon between the cylindrical crushing chamber and the surface of the crushing medium to perform crushing, and unlike the rods used in conventional rod mills, each thin disk Since each of the pulverizers moves independently, the pulverizing media blends well with the pulverized material, increasing the contact area between the two and significantly improving the pulverizing efficiency.Moreover, the pulverizing media can function as a horizontal desk ring mill. Not only that, but also a pulverizing effect can be expected between the inner circumferential surface of the disk and the outer circumferential surface of the cylinder.

Furthermore, in the crusher according to the first aspect of the invention, the cylinder inserted into the hole of the disk can uniformize the uneven movement of the crushing medium to some extent, and at the same time serve as a guide bar to maintain the posture of the disk. It also functions as a pressurizing rod to apply large pressure to uneven layers or coarse grain areas.

For the grinding medium, it is effective to reduce the thickness of the disk and increase the number of disks, and in that case, the hole in the disk should not be removed from the cylinder, and the desired posture of the disk should be maintained. In order to achieve this, it is necessary to make the cylinder shorter than the length of the cylindrical crushing chamber by within the thickness of one disk.

Further, in the crusher according to the second invention, it is also effective to reduce the thickness of the disks and increase the number of disks, and in this case, the posture of the crushing medium becomes unstable due to rotational movement. However, by loading disks with a diameter larger than half the diameter of the grinding chamber in a number commensurate with the size of the grinding chamber, the grinding media can be maintained in the required posture and operated stably. .

[Example] Fig. 1 shows the configuration of a grinding medium loaded into a cylindrical grinding chamber of a grinder according to the present invention, which has a hole in the center and is sufficiently thick compared to its diameter. It is constructed by stacking a large number of small disks 1 on top of each other and passing one elongated cylinder 2 through the hole in a state where each disk 1 can move independently. The inner and outer circumferential surfaces of the disk 1 and the cylinder 2 are actively provided with protrusions that locally press the other when they come into contact with each other or the inner surface of the cylindrical crushing chamber or the crushed material. It is formed by a substantially smooth surface.

The crusher is used by loading one set of the above-mentioned crushing media into its cylindrical crushing chamber.

The pulverizer with the above configuration mainly uses the friction phenomenon between the cylindrical pulverizing chamber and the surface of the pulverizing medium to perform pulverization, and unlike the rods used in conventional rod mills, each disc is independent of the other. Because of the movement, the grinding media blends well with the grinding material, increasing the number of contact points (or surfaces) between the two, and significantly improving grinding efficiency.Moreover, the grinding medium works as a horizontal desk ring mill. Not only that, but also a pulverizing effect can be expected between the inner circumferential surface of the disk 1 and the outer circumferential surface of the cylinder 2, so that fine powder can be efficiently produced.

Furthermore, the cylinder 2 inserted into the hole of the disk 1 can even out the uneven movement of the grinding medium to some extent, and at the same time function as a guide bar to maintain the posture of the disk 1, It also functions as a pressure rod to apply large pressure to the grain part.

For this grinding medium, it is effective to reduce the thickness of the disk 1 and increase the number of disks, in which case,
If the hole in the disk 1 becomes detached from the cylinder 2, the disk will fall down inside the grinding chamber and lose its posture.
By making the cylinder 2 shorter than the length of the cylindrical crushing chamber by a length equivalent to the thickness of one disk, the disk 1 is prevented from coming off from the cylinder 2, and the required posture is maintained. It becomes possible to do so.

Furthermore, in the present invention, a grinding medium is used in which a large number of disks larger than half the diameter of the cylindrical grinding chamber are piled up so that each disk can move independently. You can also load as many sheets as you want without it tipping over. In this case as well, the circumferential surface of the disk does not have protrusions that would apply local pressure when it comes into contact with the inner surface of the cylindrical grinding chamber or the crushed material, and is substantially smooth. It is formed by a surface and is crushed using the friction phenomenon between the cylindrical crushing chamber and the surface of the crushing medium.

This grinding medium also has the basic feature of increasing the contact area between it and the grinding material as much as possible, and therefore it is possible to increase the number of media by making the thickness of the grinding medium as thin as possible. It is valid. If the thickness of the grinding medium is made smaller than the diameter in this way, the posture of the grinding medium will become unstable due to rotational movement, but the grinding chamber should be By loading disks with a diameter larger than half the diameter in a number commensurate with the size of the grinding chamber, the grinding medium can be operated stably.

According to experiments, in a cylindrical grinding chamber with an inner diameter of 300 mm and a length of 400 mm, the outer diameter was 250 mm, the inner diameter was 100 mm, and the wall pressure was 30 mm.
When a slurry (concentration 20.8%) of industrial calcium carbonate (14.9 μm) was crushed using a grinding medium consisting of 12 mm disks and a cylinder with a diameter of 50 mm and a length of 380 mm, the average particle size was 0.7 mm. We were able to obtain extremely fine particles of μm size. This shows that the crushing capacity of the crusher of the present invention is extremely high, whereas the crushing limit particle size in the case of a normal ball mill is about 1.2 to 2 μm.

[Effects of the Invention] As explained above, according to the present invention, a large number of disks whose thickness is sufficiently thin compared to the diameter are stacked and used as a grinding medium in a state in which each disk can move independently. As a result, the compatibility of the grinding media with the grinding material is significantly improved, and while it has the characteristics of a rod mill, the contact area between the grinding medium and the grinding material is increased with a simple structure, improving grinding efficiency. A corresponding reduction in energy costs can be expected.

In addition, in the first crusher, the cylinder inserted into the hole of the disk has a crushing effect with the inner peripheral surface of the disk, an effect of suppressing uneven movement of the crushing medium to make it uniform, and an effect of suppressing uneven movement of the crushing medium. The effect of applying a large pressure to the uniform layer or coarse grain portion can be expected.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a grinding medium in a grinder of the present invention. 1... Disc, 2... Cylinder.

Claims (1)

[Scope of Claims] 1. A pulverizer in which a cylindrical pulverizing chamber is loaded with a number of disks, each of which has a sufficiently small thickness compared to its diameter, stacked on top of each other as a pulverizing medium so that each disk can move independently. In this step, one elongated cylinder was passed through a hole provided in the center of each of the disks so that each disk could move independently, and a set of the grinding media was loaded into the cylindrical grinding chamber. A crusher characterized by: 2. In a pulverizer in which a large number of disks whose thickness is sufficiently small compared to the diameter are stacked as grinding media in a cylindrical grinding chamber, and each disk is loaded in a state in which each disk can move independently, each of the above-mentioned disks The diameter of the pulverizer is larger than half the diameter of the pulverizing chamber, and a number of these disks are loaded into the pulverizing chamber so that each disk does not fall sideways.