JPS62155945A - High speed grinder in finely pulverizing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a high-speed grinder, and particularly to a high-speed grinder in a pulverizer that combines disks with different grinding powers.

[Prior Art] Conventionally, this type of high-speed grinder uses both a rotating disk and a fixed disk at I+3! ! It has been proposed that it be formed using a whetstone made of the same material with a lower degree of grinding. However, in this type of device, the rotating disk is several times faster than the fixed disk. JU L,, -1- The wear rate of the lower disk is extremely unbalanced, and the life of the disk increases, and the clearance between the opposing disks expands due to the wear of the grinding wheel, and the grain shape of the finely pulverized material increases. The disadvantages are that the particles gradually become larger and the accuracy becomes unstable, and that small particles separated by wear on the disk surface are mixed into the target material to be crushed as impurities, resulting in a decrease in product purity.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a pulverizer that has a long life, with minimal wear of the two opposing disks constituting the pulverizing section of the pulverizer, and minimal detachment of Itc grains. The purpose of the present invention is to provide a high-speed grinder for use in the industry.

Another object of the present invention is to provide a high-speed grinder in a pulverizer that is easy to manufacture and extremely versatile.

Another object of the present invention is to make it possible to easily obtain a finely pulverized product having a desired particle size and high purity by reducing the amount of oversize in the pulverized product, and to pulverize the product without causing over-grinding. The purpose of the present invention is to provide a high-speed grinder for a machine.

[Means for solving the problem] A high-speed grinder in a pulverizer according to the present invention includes a pair of opposing rotating disks and a fixed disk, and a surface of the rotating disk facing the fixed disk, The grinding surface is formed as a grinding surface having countless microbites formed by arranging ultra-hard abrasive particles, while the surface of the fixed disk facing the grinding surface is a grinding surface having a lower grinding force than the grinding surface. It is characterized by the fact that it was formed.

In a preferred embodiment, the rotating disk includes a base and a surface layer formed on the base V, and numerous ultra-hard abrasive particles having a height of 1100 JL or less are laid on the surface layer. At the same time, a part of the abrasive particles are made to protrude from the surface layer, and the height of each rise from the surface layer surface *rti in 1 uI is formed to be approximately uniform.

[Example] Hereinafter, a high-speed grinder 434-J, which is a pulverizer according to the present invention, will be explained together with an example shown in the accompanying drawings.

1 to 3, a high-speed grinder 2 for a pulverizer according to the invention comprises a set of discs, namely a rotating disc 3 and a stationary disc 4. In FIGS. The rotating disk 3 is fixed to a shaft 6 connected to a rotating machine 5 for pulverizing al, while the fixed disk 4 disposed opposite to this rotating disk 3 is fixed to a hopper 7 for inputting raw materials. (Figure 3). In this case, the shaft 6 and the rotary machine 5 may not be coaxial, but may be connected and transmitted indirectly by intervening a power transmission device such as a coupling or a belt. , comprises a base 10 and a surface layer 12 on which a large number of abrasive particles 15. The disk 3 is formed in a forest shape with a recess 13. Embedded in the surface layer 12 is at least one layer, preferably 4 to 5 layers, of abrasive particles that are densely dispersed and regularly arranged. Each of the abrasive particles 15,15... of the outermost layer rises from the surface of the surface layer 12 and stands in a forest with a height h of approximately 40 ILm or less, forming microbites of approximately uniform height, and grinding. This constitutes a surface 14 (see FIG. 2). Abrasive particles 1 on the grinding surface 14
5.15... consists of particles of 1001 Lm or less of one or more types of ultra-hard particles with a Knoop hardness of about 7000 to 3500, such as diamond and boron nitride, and the grain size of the low particles on the ground surface 14 is Visually, the outer periphery side is made finer, and the grain size becomes smaller from the center to the outer periphery. In general, the grinding surface 14 of the rotating disk 3 has a higher grinding force than that of the fixed disk 4, and is sharpened to have a sufficient grinding force. The surface layer 12 may be formed by metal plating on the base 10 or by applying abrasive particles 15, 15, etc. to the base I using synthetic resin or the like.
It can be easily formed when placing one on one on 0-1-.

Thus, the grinding surface 14 has, on the one hand, a sharp grinding force and, on the other hand, each abrasive particle 15. t5... A forest of protrusions forms a screen like the teeth of a comb. Therefore, the gaps between each tooth play the role of a fine sieve (screen),
Among the finely pulverized substances, only those of a size that can pass through this gap are forced to pass through by centrifugal force and are ejected to the outside, resulting in uniform particle shapes. Incidentally, coarse particles that cannot pass through this gap will still remain inside, or will eventually be pulverized as time passes and pass through this gap.

Next, explaining the fixed disk 4, on the lower surface side of the fixed disk 4, that is, on the side facing the grinding surface 14 of the rotating disk 3, there is a ground surface that has a lower grinding force than the grinding surface 14 of the rotating disk 3. 24 is formed. This grinding surface 24 has ultra-hard abrasive particles 25° 25...
* protrudes, forming a microbial region 1 of approximately uniform height (Fig. 2).

Similar to the case of the grinding surface 4 of the rotating disk 3, this grinding surface 24 is formed by a large number of ultra-hard abrasive particles 25.25.
. . are aligned on the base 3o and fixed to the base with metal plating or synthetic resin.

Incidentally, the abrasive particles 25.2 on the grinding surface 24 of the fixed disk 4
5... is the same material as the abrasive particles 15.15... of the grinding surface 14 of the rotating disk 3, that is, diamond when the abrasive particles 15.15... are diamond, or boron nitride. In this case, it is formed using boron nitride, and the rotating disk 3 and fixed disk
The abrasive particles 15.
The abrasive particles 25 of the fixed disk 4 for the particle size of...
．． It is formed by selecting a relatively fine particle size of 25.... Therefore, in order to set a clearance between the rotating disk 3 and the fixed disk 4, the rotating disk 3 is gradually brought closer to the fixed disk 4, and finally, when a light contact is made between the two, so-called dressing (rotating disk side Rough particles have a relatively strong cutting force, and the fine particles on the fixed disk side
Since the cutting force of particles No. 1 is relatively inferior, the abrasive particles on the rotating disk side are not worn out, and only the abrasive particles on the fixed disk side are unilaterally cut and worn out, resulting in a lack of compatibility between the two. (occurring) will be carried out and the clearance will be stabilized.

In this way, this high-speed grinder 2 sends the material to be ground into the gap A (Fig. 1) between the opposing surfaces of both disks, and grinds it by the centrifugal force generated by the rotation of the rotary disk 3.
The material is crushed and released while moving outward, and tooth-shaped abrasive particles 15.15 are fixed to the bases 10 and 30, respectively, at the outer periphery of the facing disks.
... and the abrasive particles 25.25... are kept extremely close to each other, so that the only finely pulverized material that has been pulverized is that which has been pulverized to the point where it can pass through the gaps between the teeth of the abrasive particles. is forced through the disk by centrifugal force and released from the outer circumference of the disk. Therefore, the gaps between the teeth of the abrasive particles play the role of classification.

FIG. 4 shows a pulverizer 1 to which this high-speed grinder 2 is applied. In this figure, reference numeral 60 indicates a motor, 6, 63
62 indicates a pulley, 62 indicates a belt, and 64 indicates a guide opening of a cover for guiding the crushed material.

Next, we actually used a crusher l (see Figure 4) to which this high-speed grinder 2 was applied (water was used as a refrigerant and suspension liquid).
When we attempted to pulverize fine river sand containing frogstone as the main component (approximately φ, 5 mm or less obtained by passing the collected fine river sand through a 12-mesh sieve), we obtained the following results. .

The test is based on the light transmission method.

44~20 Jj, m 17.2%20~
10 lm 16.5%10~4 JLm
12.3%4~2 ILm 1
, 1% 2 m or less 42.9% Clearance measurements are as follows.

Rise of protrusion 30~40gm Disc rotation runout +) 5~15Hz, m clearance
35-551, m However, the specification conditions are as follows.

[Specification conditions] (1) The diameter of both disks is 24 cm; (2) Regarding the rotating disk: The shape of the surface is flat. Diamonds of the same grain size are implanted all over the grinding surface of the disc. however,
Tiresen 14 grains IN I OO number = 149JLm, height of rising from the surface layer of 0 "deposition particles" 3O-
40p, m. Nickel is used as the fixing bond for implanting the abrasive particles into the surface layer. The rotation speed is 3200 to 3400 rpm. The motor power that drives the rotating disk is 3.7 kW; (3) Regarding the fixed disk; The fixed disk is concave. The material is alundum. Particle size is 100. The pores are filled with resin impregnation. "
The height of the "contains" is 3 mm at the circumference with a radius of 3.75 mm from the center; (4) Regarding the raw materials; weight ratio of sand 1: water 4; (5) raw material passing speed is approximately 30 kg/hr; According to the test data described in Section 2, oversize exceeding 44 ILm did not occur at all. Figure 5 shows the log - log change in the amount of sediment in the graduated cylinder over time (volume % of the graduated cylinder) when a sedimentation test was conducted in the graduated cylinder using this finely pulverized material. This is shown in the graph below. In this graph, M indicates the material that has been run through the high-speed grinder four times, and N indicates the material that has run through the high-speed grinder once. Therefore, for example, if the amount of sediment is 2%, it means that 98% of the volume is made up of colloid-like suspended matter and the transparent liquid part found at the top of the graduated cylinder. As is clear from this figure, the material that has been run through the high-speed grinder four times has a lower sinking value than the one that has been run through the high-speed grinder once. It can be seen that the material can be pulverized extremely finely, and it has excellent pulverization ability.

Furthermore, this high-speed grinder 2 (disc diameter 18cm
, 20 meshes of particles on the grinding surface, rotation speed 1500-180
0 revolutions/min, clearance between both discs 0.05mm
) was used to crush coarsely crushed chicken shells in the presence of a refrigerant, resulting in a colloidal product in which powder of less than io #L, m was dispersed in benist-like meat protein. It was done.

Therefore, when we measured the wear conditions of the rotating disk 3 and fixed disk 4 before and after crushing chicken shells, we found that the relationship between s, l+2, j, , j2 shown in Figs. 6A and 6B is h.
r h2 吋0,, -12 小O.

In the above example, river sand and chicken shells were crushed, but according to this high-speed grinder, food, fuel,
For fine pulverization of paints, chemicals, inorganic substances (e.g. various ores, metals, ceramics), organic substances (e.g. vegetable matter, animal matter, coal, petroleum residue, various polymeric carbohydrate solids), electronic materials, microorganisms, etc. Needless to say, it can be used.

As a modification of the grinding surface of the rotating disk, the grinding surface may be formed into a flat shape as shown in FIGS. 7 and 8. The shape of the grinding surface of the fixed disk is determined by the properties of the pulverized material, but if the grinding surface 64 of the rotating disk 53 is formed flat, the shape of the grinding surface of the fixed disk 54 is determined by the properties of the crushed material.
It is preferable to form the grinding surface 74 in a slightly concave shape. This type of high-speed grinder 52 can be used for materials that are relatively easy to grind and grind.

Hereinafter, in each of the embodiments (g), an example was shown in which the abrasive particles were implanted over the entire grinding surface of the rotating disk, but the implantation at the center of the disk may be omitted. In addition, the ground surface on the fixed disk side (: formed by implanting an abrasive material in one layer overnight), or the entire fixed disk is made of old material with relatively low hardness, such as A, WA, C, GC, etc. J: may be formed on the raw material.In this case, the hardness of the fixed disk is preferably formed to be approximately % or less of the I+3!! hardness of the grinding phase particles of the rotating disk.

Furthermore, if the material to be crushed is relatively hard or the shape of the crushed particles is uneven, such as oblate or spindle-shaped, and a higher degree of grinding is required, a rotating disk 83 having a shape as shown in FIG. It is preferable to use a fixed disk 84. In this case, the centrifugal force generated by the high speed forces the material against the fixed disk 84 and cuts it. Further, as a modification of the shapes of the rotating disk and the fixed disk, a rotating disk 93 and a fixed disk 94 having shapes as shown in FIG. 10 may be used. Furthermore, as shown in Figures 11A1 and 11B,
Abrasive particles 115 on the surface layer 112 of the rotating disk 103,
115... are embedded in multiple layers, the outermost layer forming the microbials 1~, and the fixed disk 10
A plurality of layers of abrasive particles 125, 125, . . . may be embedded in the outer layer 122 of No. 4. In this case, the outermost layer of abrasive particles 115, 115..., 125, 125
. . . has the advantage of being able to utilize the abrasive particles of the next layer by performing truing or dressing when they become worn.

[Effects of the Invention] As described above, according to the present invention, the crushed material is discharged outside the machine through the sieve formed by the abrasive particles in the rotating disk. It is possible to easily obtain a finely pulverized product, and since a stable clearance can be maintained, over-pulverization is less likely to occur. In addition, since the cutting process is performed using ultra-hard micro-bites, the product particles are not crushed, so the shape of the product particles is regular, and the grinding surface cuts smoothly, so the load during the grinding process is light. ,
Good grinding efficiency per unit time.

Furthermore, according to the present invention, the hardness of the material that forms the disk surface for grinding and pulverization is high and there is always little wear, so a product with high purity can be obtained with less separation and contamination of low-grade particles, and the tip of the micro-bite The cooling effect due to conduction and diffusion of the generated heat and cooling is remarkable, and there is no effect of heat on the product to be crushed.Furthermore, as a noteworthy effect of the present invention, the P? ! It can be shown that the wear rate is low, the service life is long, and the frequency of foot IF due to increased clearance and the frequency of repair, modification, and replacement of the disk shape is reduced, which improves work efficiency.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view showing a high-speed grinder according to the present invention, Fig. 2 is a partially enlarged view thereof, Fig.
Figure 5 is a graph showing the change over time of the precipitate in the graduated cylinder when a sedimentation test was conducted in the graduated cylinder using the sample No. 2 crushed by the pulverizer shown in Figure 4;
Figure A is a schematic cross-sectional view showing the state of the high-speed grinder shown in Figure 1 before material crushing, Figure 6B is a schematic cross-sectional view showing the state after crushing, and Figures 7 to 11A and 11B are It is a figure which shows several other Examples of such a high-speed grinder. Figure 8 Procedural Amendment Document January 1, 1985 4! i Mr. Michibu Uga, Commissioner of the License Agency 1, Indication of the case 3, Person making the amendment Relationship to the case Patent applicant address 87-302 Iki Danchi, Nishi-ku, Fukuoka City Name
Masamichi Nagao (and 1 other person) 4, Agent Address: 1-19-6-4015 Nishishintachibana, Minato-ku, Tokyo.
Daily publication of amendment orders 6, Drawings subject to amendment 7, Contents of amendment

Claims (5)

[Claims] (1) It comprises a pair of opposing rotating disks and a stationary disk, and the surface of the rotating disk that faces the stationary disk is equipped with countless micro-bites formed by arranging ultra-hard abrasive particles. 1. A high-speed grinder for a fine pulverizer, characterized in that a surface of the stationary disk facing the grinding surface is formed as a grinding surface having a lower grinding force than the grinding surface. (2) The rotating disk includes a base and a surface layer formed on the base, and the surface layer has a height of 100 mm.
A countless number of ultra-hard abrasive particles of μm or less are laid down and fixed, and a portion of the abrasive particles protrudes from the surface layer, and the height of each rise from the surface layer is made substantially uniform. A high-speed grinder in a pulverizer according to claim 1. (3) A high-speed grinder in a pulverizer according to claim 2, wherein the ultra-hard abrasive particles are embedded in a plurality of layers in the surface layer. (4) The abrasive particles have a Knoop hardness of 3500 to 7.
A high speed grinder in a pulverizer according to claim 2, wherein the particles are in the range of 0.000. (5) A high-speed grinder in a pulverizer according to claim 1, wherein the rotating disk is formed in a mortar shape having a recessed portion.