JPH0329460B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a high-speed grinder,
In particular, it relates to a high-speed grinder in a pulverizer that combines microbite disks of different hardness and particle size.

[Conventional technology]

Conventionally, this type of disc is a combination of a rotating disc and a fixed disc made of grindstones made of the same material with low hardness, or a disc with a hard rotating disc surface.
It has been proposed that the stationary disk is made of a material having a lower hardness than the surface of the rotating disk (see, for example, Japanese Utility Model Publication No. 3475/1983).

[Problem to be solved by the invention]

In the former of the conventional techniques, the rotating disk and fixed disk are made of the same material,
Because they are made of grindstones with the same abrasive grains, the rotating disc wears out several times faster than the fixed disc, and the wear rate of the upper and lower discs is extremely unbalanced. Discs (materials are A, WA, C, GC) etc.) is
Old abrasive grains detach from the surface due to surface wear,
Since it is a type of grinder that uses newly exposed abrasive grains to grind the material, the separated abrasive grains are mixed into the object to be ground as impurities, and as a result, the ground material requires high purity. In some cases, there was a problem that it could not be used as a pulverizer.

In addition, in the latter case, this prior art feeds the object to be crushed between a rotating disk and a fixed disk that are pressed against each other, and transfers compressive force and shear force from both the rotating disk and the fixed disk to the object to be crushed. Since the target object is crushed by grinding, which involves the separation of the abrasive grains from both discs, the abrasive grains that have separated from the grinding wheel may get mixed into the pulverized material, and the heat generated by the friction caused by the compression force may cause the object to be crushed. There were problems such as the material deteriorating in quality, or materials rich in fibers not being crushed and becoming flat, and the grooves on the disk surface forming a spindle shape.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to reduce the amount of impurities mixed into the pulverized material due to the separation of abrasive grains, and to reduce the amount of fibrous material. It is an object of the present invention to provide a high-speed grinder in a fine pulverizer which can also pulverize substances rich in ion and which does not cause the resulting pulverized product to change in quality.

Another object of the present invention is to provide a high-speed grinder in a pulverizer that is capable of pulverizing objects to be pulverized with uniform particle size.

Another object of the present invention is to provide a high-speed grinder in a pulverizer that requires less frequent clearance adjustment, disk surface repair, and replacement, and is highly efficient in operation.

[Means to solve the problem]

The present invention comprises a pair of opposing rotating disks and fixed disks, grinding surfaces are formed on opposing surfaces of both disks, the rotating disk is fixed to a shaft connected to a driving means, and the rotating disk is fixed to a shaft connected to a driving means. A high-speed grinder in which the grinding surfaces of the rotary disks are made of hard abrasive grains, the grinding surfaces of both discs facing each other with a predetermined clearance, and the grinding surfaces of the rotary discs being arranged close to each other. The grinding surface of the stationary disk is formed with abrasive grains to form a micro-bite, and the ultra-hard abrasive grain of the rotating disk has a Knoop hardness.
3,500 to 7,000 ultra-hard abrasive grains, and the abrasive grains of the fixed disk are composed of abrasive grains having a hardness of 2/3 or less of the ultra-hard abrasive grains of the rotating disk, and the abrasive grains of the rotating disk are A high-speed grinder in a pulverizer, characterized in that the particle size of the abrasive grains of the fixed disk is finer than that of the abrasive grains of the fixed disk.

〔Example〕

Examples will be described with reference to the drawings.

1 to 3, a high-speed grinder 2 for a fine pulverizer according to the present invention is equipped with a pair of disks, namely a rotating disk 3 and a fixed disk 4, which constitute microbites of different hardness and particle size. There is. The rotating disk 3 is a driving means (rotating machine) for the pulverizer 1
It is fixed to a shaft 6 connected to 5.
On the other hand, a fixed disk 4 disposed opposite to the rotary disk 3 is fixed to a hopper 7 for feeding raw materials.

Among these, the rotary disk 3 is composed of a base 11 and a grinding surface 12 on the base 11, and the rotary disk 3 as a whole is formed in a mortar shape with a recess 13. The grinding surface 12 is formed using ultra-hard abrasive grains 12' such as diamond or boron nitride, but in order to uniformize the particle size of the fine powder while cutting the object to be ground, the grinding surface 12 has a Knoop hardness. Ultra-hard abrasive grains 12' with 3500 to 7000
It is important to compose the The grain size of the ultra-hard abrasive grains 12' on this grinding surface 12 is coarse at the center, medium at the middle, and fine at the outer periphery, and the grain size is gradually reduced from the center to the outer periphery. are doing. Further, the ultra-hard abrasive grains 12' are arranged close to each other, and the grinding surface 12 of the rotary disk 3 forms a micro-bite for cutting and crushing the object to be crushed. Furthermore, the ultra-hard abrasive grains 12' on the grinding surface 12 of the rotating disk 3 are the same as those on the fixed disk 4.
The hardness is higher than that of the abrasive grain 4', and the ultra-hard abrasive grain 1
2' is formed into a fine particle size, and the rotating disk 3
The grinding surface 12 is formed by imparting a grinding force stronger than that of the grinding surface of the fixed disk 4.

On the other hand, the fixed disk 4 has a convex portion 23 corresponding to the concave portion 13 of the rotating disk 3, and the abrasive grains 4' have a hardness of 2/3 or less of the hardness of the ultra-hard abrasive grains 12' (for example, the material thereof is A, WA, C, GC, etc.
When the grinding surface 12 of the rotary disk 3 is made of diamond, the stationary disk 4 is made of boron nitride or a material less hard than boron nitride. The reason why the hardness of the abrasive grains 4' of the fixed disk is limited is that if the hardness of the abrasive grains 4' of the fixed disk exceeds 2/3 of the hardness of the ultra-hard abrasive grains 12' of the rotating disk, incorrect operation may occur. Therefore, when the rotating disk and the fixed disk come into contact, the expensive rotating disk will be damaged. (If the hardness is less than 2/3 of the hardness of the rotary disk, even if the rotating disk and fixed disk come into contact due to incorrect operation, the expensive rotating disk will not be damaged.) Further, the grain size of the abrasive grains 4' of the fixed disk 4 is relatively coarse compared to the grain size of the ultra-hard abrasive grains 12' of the grinding surface 12 of the rotating disc 3. For this reason, a space consisting of a clearance A formed by the grinding surface 12 of the rotary disk 3 and the fixed disk 4 and a recess 9 to be described later.
It becomes possible to feed the object to be crushed into A′.
As with the rotary disk 3, the fixed disk 4 is preferably formed so that the abrasive grains are coarse in the center and fine in the outer periphery. The part indicated by numeral 9 is a part for temporarily holding the added substance. The object to be crushed in the space A' moves from the inner circumference to the outer circumference due to the centrifugal force of the rotating disk 3 between the clearance A and the microbites of the rotating disk 3 and the fixed disk 4. While moving, the object to be crushed is captured by the abrasive grains 4' of the fixed disk 4,
It is cut into small pieces by the ultra-hard abrasive grains 12' of the rotary disk 3, released from capture, and moved to the outer periphery, further caught and cut on the outer periphery, and pulverized into even smaller pieces.
As the pulverization is repeated in this manner, the pulverized material has a size that can pass between the clearance A and the microbites, and is discharged from the discharge port 8. The particle size of the fine powder is adjusted by moving a positioning nut (not shown) on the fixed disk 4 to adjust the clearance A.

This high-speed grinder 2 sends the object to be crushed to the clearance A between the opposing surfaces of both disks, and uses the centrifugal force generated by the rotation of the rotary disk 3 to move the object to the outside, crush it, and release it. However, next is actually this high-speed grinder 2 (disc diameter 18 cm, grinding surface particles 20
When coarsely ground chicken shell was crushed in the presence of a refrigerant using a mesh machine (from 50 meshes to 50 meshes, rotation speed 1500 to 1800 revolutions/min, clearance between both disks 0.05mm), paste-like meat protein was found. A colloidal material in which bone powder of 10 microns or less was dispersed was obtained. Therefore, we measured the wear conditions of the rotating disk 3 and fixed disk 4 before and after crushing the chicken shell, and found h ₁ , h ₂ , l ₁ , l ₂ shown in Figures 4A and 4B.
The relationships were h ₁ −h ₂ ≒0 and l ₁ −l ₂ ≒0.

FIG. 5 shows another embodiment of the present invention. In this embodiment, a rotary disk 33 is provided with a flat fixed disk 34 with a recess. Furthermore, what is shown in FIG.
3 has a convex center, and the fixed disk 44 has a concave center.

In the example, an example of grinding a chicken shell was shown, but this high-speed grinder can also be used to finely grind foods, fuels, paints, medicines, organic and inorganic chemicals, electronic materials, microorganisms, metals, etc. Needless to say, it can be used.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

The object to be pulverized is cut and pulverized to a particle size that can pass through the clearance between the rotary disk and the stationary disk, so it is possible to pulverize the object with uniform particle size and less variation.

Grinding is done using ultra-hard abrasive grains,
Furthermore, since the grinding process is carried out between the grinding surfaces of both disks with a clearance, there is no abrasion of the abrasive grains or wear due to contact between the grinding surfaces.Therefore, there is less chance that the separated abrasive grains will be mixed into the object to be crushed, increasing the purity of the product. becomes possible.

In addition, since the wear of the rotating disk can be reduced, the frequency of clearance adjustment, repair and replacement of the disk surface is reduced, and work efficiency is improved. There is little heat generation and power consumption, and there is no deterioration of the quality of the pulverized material.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing the high-speed grinder according to the present invention in use, FIG. 2 is an enlarged cross-sectional view showing the high-speed grinder according to the present invention, FIG. 3 is a schematic cross-sectional view showing its operating condition, and FIG. Schematic cross-sectional view showing the state of the high-speed grinder before grinding the material, No. 4B
The figure is a schematic cross-sectional view showing the state after grinding, and FIG. 5 is a schematic cross-sectional view showing the operating state of another high-speed grinder.
FIG. 6 is a schematic cross-sectional view showing another embodiment. 2...High-speed grinder, 3...Rotating disk, 4...
Fixed disk, 4'... Abrasive grain, 9... Contains, 11... Base, 12... Grinding surface, 12'... Super hard abrasive grain.

Claims (1)

[Scope of Claims] 1. A rotary disc and a fixed disc that face each other, a grinding surface is formed on the opposing surfaces of both discs, and the rotary disc is fixed to a shaft connected to a driving means, A high-speed grinder in which the grinding surfaces of the rotating disks are made of hard abrasive grains, the grinding surfaces of both disks facing each other with a predetermined clearance, and the grinding surfaces of the rotating disks being arranged close to each other. A micro-bite is formed by hard abrasive grains to cut and crush the object to be crushed, and the grinding surface of the stationary disk is formed by abrasive grains to form a micro-bite, and the ultra-hard abrasive grains of the rotating disk are used to form a micro-bite. hardness
3500 to 7000 ultra-hard abrasive grains, and the abrasive grains of the fixed disk are composed of abrasive grains having a hardness of 2/3 or less of the ultra-hard abrasive grains of the rotating disk, and the ultra-hard abrasive grains of the rotating disk A high-speed grinder in a fine pulverizer, characterized in that the particle size of the abrasive grains of the fixed disk is finer than that of the abrasive grains of the fixed disk.