JP3219955B2 - Collision type air crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impingement type air current pulverizer provided with a pulverizing nozzle for supplying a pressure reducing portion using a jet jet, and more particularly, to a toner or a colored resin for toner used for image formation by electrophotography. The present invention relates to an impingement airflow pulverizer suitable for producing powder.

[0002]

2. Description of the Related Art A collision type air flow pulverizer using a jet jet supplies an object to be pulverized in a jet jet, causes the object to be pulverized to collide with a collision member, and pulverizes by the impact force. A general configuration of such a collision type air flow pulverizer will be described with reference to FIG. FIG. 4 is a flow sheet of a pulverizing / classifying step in which a collision type air flow pulverizer and a classifier are combined, and the collision type air flow pulverizer is shown in a schematic longitudinal sectional view.

In this impingement type air flow pulverizer, an impingement member 4 is provided opposite an acceleration tube outlet 8 of an acceleration tube 3 connected to a compressed gas supply nozzle 2, and a high speed air flow 14, which is a jet jet by the acceleration tube 3, is provided. The object 6 to be crushed by the flow is
Is sucked into the accelerating tube 3 from the supply port 1 provided in the middle of the crushing, and is injected together with the high-speed airflow 14 to be incident on the crushing chamber 7 so as to collide with the collision surface 9 of the collision member 4 and to be crushed by the impact force. I do.

Usually, in order to pulverize the material to be ground 6 to a desired particle size, a classifier 1 is provided between the supply port 1 and the discharge port 5 of the material to be ground.
3 to form a closed circuit. In this case, the classifier 13
After the classification by crushing, the coarse powder is sent to the crushed material supply port 1 via the return path 11 and crushed as described above.
0 is returned from the discharge port 5 to the classifier 13 and classified again, so that the desired fine powder is obtained via the path 12.

[0005]

However, in the conventional impingement type air-flow pulverizer having the decompression-section-supply-type pulverizing nozzle, in the injection nozzle constituted by the compressed-air supply nozzle 2 and the accelerating pipe 3, the effective use of the accelerating pipe 3 is effective. The relationship between the length L and the divergence angle θ (see FIG. 4) is not sufficiently appropriate, and the jet jet flowing through the accelerating tube 3 under a normal pressure causes the jet jet to flow inside the accelerating tube 3. Sufficient expansion cannot be obtained on the wall, and the vehicle stalls during passage. On the other hand, if the effective length L is short, the acceleration distance becomes insufficient, and if the effective length L is too long, a pressure loss occurs and the vehicle decelerates due to deceleration.

In order to solve such a problem, Japanese Patent Application Laid-Open Nos. 3-26349, 3-26350 and 3-30845 disclose a technique in which the divergence angle θ of the accelerating tube 3 is set to 7 °. Although an injection nozzle defined within the range of ９9 ° has been proposed, it has not always been possible to obtain a sufficient pulverizing treatment capacity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the object of the present invention is to make effective use of the energy of a compressed gas to improve the crushing air flow with improved pulverization capacity. A crusher is provided. The pulverizer of the present invention achieves this purpose by:
The structure of the injection nozzle is improved as follows.

[0008]

Hereinafter, the structure and operation of the present invention will be described more specifically with reference to FIGS. The collision type air flow crusher of the present invention blows out from the acceleration tube 3 into the crushing chamber 7 at a stage subsequent to the decompression unit supply acceleration tube 3 for transporting and accelerating the object 6 through the object supply port 1 by the high speed air flow. A collision surface 9 (FIG. 4) for crushing the crushed object 6 by an impact force.
This is an improvement of the pulverizer having the structure provided with the above structure. When the high-pressure gas ejected from the compressed gas supply nozzle 2 passes through the accelerating tube 3, ideal adiabatic expansion becomes supersonic. For this reason, according to the collision type airflow pulverizer of the present invention,
The material 6 to be crushed can be crushed to the order of several μm by efficiently utilizing the high-speed air flow.

FIG. 1 is a schematic vertical sectional view of a compressed gas supply nozzle 2 and an accelerating tube 3 provided in a collision type air current pulverizer according to the first to sixth aspects. That is, the collision-type airflow pulverizer according to claim 1 comprises a compressed gas supply nozzle 2 and an accelerating tube 3 connected to the supply nozzle 2 and having a supply port 1 to be pulverized.
And a collision member 4 for crushing the object 6 to be crushed.
The effective distance along the common center line C of the supply nozzle 2 and the acceleration tube 3 from the throat 2a of the compressed gas supply nozzle 2 to the effective outlet 3b of the acceleration tube 3 (effective length of the acceleration tube 3) is L, also the accelerating tube 3, the distance from the throat portion 2a is half of the effective distance L, and distance along the common centerline C and L _1, For the inner peripheral surface of the acceleration tube 3, the angle between the line l connecting the throat portion 2a and the effective outlet portion 3b and the common center line C is doubled (the divergence angle of the acceleration tube (3)) is θ. and then, further, the inner peripheral surface of the accelerating tube 3, from the throat portion 2a, 3a point on distance along the common centerline C is L ₁ and the acceleration tube 3 inner peripheral surface is
When the angle between the line l ₁ connecting the point and the point on the inner peripheral surface of the throat 2 a and the common center line C is doubled as θ ₁ , the inner peripheral surface of the accelerating tube 3 is expressed as 1].

[0010]

[Number 1] Ltan (θ / 2) ≧ L 1 tan (θ 1/2)
> (1/2) Ltan (θ / 2)

In the impingement type air current pulverizer having such an acceleration nozzle, the object 6 supplied from the object supply port 1 to the accelerating tube 3 is conveyed by the air flow ejected from the compressed gas supply nozzle 2. You. In this case, the compressed gas supply nozzle 2
Airflow reaches sonic velocity at the throat portion 2a of by angle theta ₁ is accelerated to supersonic, it is possible to maintain the gas velocity by the angular theta ₂ (see Figure 1). The angle theta _2, as shown in Figure 1, from the throat portion 2a, and 3a point distance on within the acceleration tube 3 peripheral surface is L ₁ along a common center line C, the effective outlet 3
The angle formed by the line l ₂ connecting b and the common center line C is doubled.

According to a second aspect of the present invention, in the collision-type airflow pulverizer, the accelerating tube 3 in the first aspect has a diameter D of the throat portion 2a, an effective length L of the accelerating tube 3, and a spread angle θ of the accelerating tube 3. Between
A relational expression expressed by the following [Equation 2] holds, and θ is 1
It is characterized by having a gently expanding shape in which L is in the range of 8D to 30D at a temperature of 7 to 7 °.

[0013]

1.8D ≧ Ltan (θ / 2) ≧ 0.13D

According to a third aspect of the present invention, there is provided an impingement-type airflow pulverizer according to the second aspect, wherein the pulverizer has a shape in which the jet from the accelerating tube generates a drift and impinges while being dispersed.
₂ (see FIG. 6) and uses a compressed gas having a pressure of 0.7 MPa or more.
, The effective length L of the accelerating tube 3, and the divergence angle θ of the accelerating tube 3, a relational expression expressed by the following [Equation 3] holds. Further, when the angle θ is 2 ° to 7 °, L Has a gentle spreading shape in the range of 10D to 30D.

[0015]

## EQU3 ## 1.8D ≧ Ltan (θ / 2) ≧ 0.19D

According to the study of the present inventors, when the crushable material 6 having low crushability is crushed by the crusher according to claim 3, the pressure in the compressed gas supply nozzle 2 is set to 0.7 MPa or more. Has been confirmed to be effective in improving the pulverizability and reducing the amount of fine powder generated by over-pulverization.

According to a fourth aspect of the present invention, there is provided a collision-type airflow pulverizer according to the second aspect, wherein the pulverizer has a shape in which the jet from the accelerating tube generates a deflected flow and collides while being dispersed.
₂ (see FIG. 6), and uses a compressed gas having a pressure of 0.7 MPa or less.
, The effective length L of the accelerating tube 3, and the divergence angle θ of the accelerating tube 3, a relational expression expressed by the following [Equation 4] holds, and when the angle θ is 2 ° to 7 °, L Is in the range of 8D to 25D and has a gently expanding shape.

[0018]

## EQU4 ## 1.2D ≧ Ltan (θ / 2) ≧ 0.19D

According to the study of the present inventors, in the pulverizer according to the fourth aspect, when pulverizing the material 6 having relatively good pulverizability, the pressure in the compressed gas supply nozzle 2 is set to 0.7.
It has been confirmed that setting the pressure to not more than MPa is effective in reducing the amount of fine powder generated by over-pulverization, and also can reduce the amount of melt agglomerates generated by the heat of pulverization.

According to a fifth aspect of the present invention, there is provided an impingement-type airflow pulverizer according to the second aspect, wherein the pulverizer has a shape in which the jet from the accelerating tube 3 directly impacts without generating any drift or dispersion. ₁ (see FIG. 5), and the acceleration tube 3 is provided with a throat 2a.
, The effective length L of the accelerating tube 3, and the divergence angle θ of the accelerating tube 3, a relational expression represented by the following [Equation 5] holds, and when the angle θ is 1 ° to 5 °, L Has a gentle spreading shape in the range of 8D to 30D.

[0021]

## EQU5 ## 0.78D ≧ Ltan (θ / 2) ≧ 0.13D

According to the study of the present inventors, the pulverizing ability of the pulverizer according to the fifth aspect is slightly lower than that of the pulverizers according to the third and fourth aspects, but it is effective in preventing the generation of fine powder due to excessive pulverization. Yes,
It has been confirmed that high-efficiency pulverization with high yield is possible.

In the pulverizer shown in FIG. 2, a diverging outlet 3c is provided at an effective outlet 3b at the end of the accelerating tube 3, and the outlet of the accelerating tube 3 is rapidly expanded. The angle is set by the throat 2a of the compressed gas supply nozzle 2 and the effective outlet 3b of the accelerating tube 3, but not by the throat 2a and the divergent outlet 3c. Although the acceleration tube 3 shown in FIG. 2 has a sharply expanding portion in a portion ahead of the effective length L portion, the effect of the present invention is still obtained.

FIG. 7 shows the definitions of the throat 2a and the effective distance L. In FIGS. 1 to 3, the throat 2 a shows a joint surface between the acceleration tube 3 and the compressed gas supply nozzle 2,
The throat portion 2a itself is the narrowest portion between the compressed gas supply nozzle 2 and the acceleration tube 3. Therefore, the throat 2a is connected to the supply nozzle 2
Not only at the joint boundary between the gas and the acceleration tube 3, but also at the supply nozzle 2,
In some cases, it may be present inside both of the acceleration tubes 3. When the value of the narrowest part indicating the throat 2a has the same width in the longitudinal direction and the same width, the effective distance L of the accelerating tube 3 is from the position of the throat 2a closest to the outlet 8 of the accelerating tube 3 to the outlet 8. (See FIG. 7).

The diameter D of with reference to FIG. 8 throat 2a, the effective distance L and L ₁ supplementary explanation. In FIG. 8, the compressed gas supply nozzle 2 is made longer, and the divergence angle θ in the compressed gas supply nozzle 2 is made very small. In this case, the acceleration effect does not exceed the effect of the acceleration tube 3 shown in FIG. The diameter D is the diameter of the narrowest part of the acceleration tube 3 or the compressed gas supply nozzle 2. Effective distance L
When the intersection of the extension l _{3 of the} contour representing the tapered inner peripheral surface of the acceleration tube 3 and the straight line l ₄ contacting the narrowest portion and parallel to the common center line C is 2b, It refers to the distance along the common center line C from 2b to the effective outlet 3b of the acceleration tube 3. For a more L _1, the distance from the intersection point 2b is 1/2 of the effective distance L, thereby forming distance along the common centerline C.

FIG. 3 is a schematic vertical sectional view of the compressed gas supply nozzle 2 and the accelerating tube 3 provided in the pulverizer of the first embodiment.
That is, the accelerating tube 3 is configured by arranging the annular bodies 3d and 3e in the longitudinal direction of the accelerating tube 3, and connecting the ring members 3d and 3e so as to be able to be divided. In the impingement type air current pulverizer, the material to be pulverized is conveyed to the outlet 8 of the accelerating tube by the high-pressure gas ejected from the compressed gas supply nozzle 2, and the material to be pulverized depends on the use and the type of the material. Are different. Different in order to form a pulverized stream suitable for grinding object, in the accelerating tube according to claim 6, wherein to freely configure a combination of theta ₁ and theta _2, accelerated object to be crushed at high speed in an optimum state The accelerating tube 3 is configured to be divided and combined so that the possible expanded shape of the accelerating tube 3 can be easily formed. In addition,
In FIG. 3, the acceleration tube 3 is formed by connecting two ring members, but three or more ring members may be connected.

As described above, the impingement type air current pulverizer of the present invention is provided with the accelerating tube and the impingement member having the predetermined characteristics, and the pulverizing energy can be effectively used by using a compressed gas having an appropriate pressure. Thus, highly efficient pulverization can be performed.

[0028]

Embodiments of the present invention will be described below. Example 1 (according to claim 3) 100 parts by weight of a polyester resin 8 parts by weight of a phthalocyanine-based pigment A toner pigment having the above formulation was mixed in a mixer, and the mixture was melt-kneaded at about 200 ° C. in an extruder. The mixture was cooled and solidified, and the cooled mixture was coarsely pulverized into particles of 200 to 2000 μm by a hammer mill. This coarsely pulverized material was used as a material to be pulverized, and pulverized by a pulverizer and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder.

The compressed gas supply nozzle 2 of the impingement type air flow pulverizer
Compressed air at a pressure of 0.882 MPa is introduced from the crushed material supply port 1 shown in FIG.
Supplied at the rate of The obtained pulverized material 10 was sent to a classifier 13 to remove the fine powder as a classified powder, and the coarse powder was again fed into the accelerating tube 3 together with the powder raw material from the pulverized material supply port 1 as the pulverized material 6.

The accelerating tube 3 shown in FIG.
= 9 mm, L = 25D, θ = 7 °, θ ₁ = 12.8 °,
Using those theta ₂ = 1 °, as the collision member, jet from the acceleration tube 3 is caused to drift, shape impinging while being dispersed, using a collision member 4 ₂ shown in FIG. 6, the continuous operation Although the experiment was conducted, a large amount of molten agglomerates was generated on the way, and it was impossible to continue the experiment. Even if the supply amount of the pulverized material was reduced, there was no effect on the prevention of the generation of the molten agglomerates.

Example 2 (According to Claim 4) The same material 6 to be ground as in Example 1 was pulverized by a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
34 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 is D in FIG.
= 9 mm, L = 18.5D, θ = 5 °, θ ₁ = 8.9
°, using those theta ₂ = 1 °, as the collision member, jet from the acceleration tube 3 is caused to drift, shape impinging while being dispersed, using a collision member 4 ₂ shown in FIG. 6, 12 A continuous operation for hours was performed. As a result, the volume average particle size was 9 μm.
Thus, fine powder having a particle size of 4 μm or less and a generation amount of fine powder of 14% of the whole was obtained.

Example 3 (According to Claim 5) The material 6 to be ground as in Example 1 was ground by a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
30 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 is D in FIG.
= 9 mm, L = 18.5D, θ = 3.5 °, θ ₁ = 6
°, using those theta ₂ = 1 °, as the collision member, using jet drift from the acceleration tube 3, none of the variance of the shape impinging directly without generating a collision member 4 ₁ shown in FIG. 5 And 1
A continuous operation for 2 hours was performed. As a result, the volume average particle size was 9 μm, and the amount of fine powder having a particle size of 4 μm or less was 1
A fine powder of 2% was obtained. In addition, when the compressed air of 0.882 MPa was introduced from the compressed gas supply nozzle 2 under the conditions in Example 3, molten aggregates were generated, and the experiment could not be continued.

Example 4 (According to Claim 6) The same material 6 to be pulverized as in Example 1 was pulverized by a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
30 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 and the collision member include:
The same shape and size as in Example 3 were used.
In this embodiment, as shown in FIG. 3, the throat 2 a of the accelerating tube 3 is connected to L _1.
A 12-hour continuous operation was performed using a part that can be divided at the position. As a result, a fine powder having a volume average particle size of 9 μm and an amount of fine powder having a particle size of 4 μm or less of 12% of the whole was obtained.

COMPARATIVE EXAMPLE 1 Pulverization was carried out on a material 6 to be pulverized in the same manner as in Example 1 by using a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
20 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 is D in FIG.
= 9 mm, L = 25D, θ = θ ₁ = θ ₂ = 7 °, and the collision member has a shape in which the jet from the accelerating tube 3 is deflected to collide while being dispersed, as shown in FIG. using the collision member 4 _2, it was continuously operated for 12 hours. As a result, a fine powder having a volume average particle diameter of 9 μm and an amount of fine powder having a particle diameter of 4 μm or less of 18% of the whole was obtained.

Further, under the conditions of Comparative Example 1, compressed air of 0.882 MPa was introduced from the compressed gas supply nozzle 2. However, it was impossible to continue the experiment because molten agglomerates were generated. However, there was no effect on the prevention of the generation of molten aggregates.

Comparative Example 2 Pulverization was carried out on a material 6 to be pulverized in the same manner as in Example 1 by using a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
17 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 shown in FIG.
= 9 mm, L = 25D, θ = θ ₁ = θ ₂ = 7 °, and the collision member has a shape in which the jet flow from the acceleration tube 3 directly collides without generating any drift or dispersion. FIG.
Using the collision member 4 ₁ shown in, was continuously operated for 12 hours. As a result, the volume average particle size was 9 μm, and the particle size was 4 μm.
A fine powder having an amount of fine powder having a size of 14 μm or less was obtained.

Further, under the conditions in Comparative Example 2, compressed air of 0.882 MPa was introduced from the compressed gas supply nozzle 2, but the molten agglomerates were generated and the experiment could not be continued. Even if the supply amount was reduced, there was no effect in preventing the generation of the molten aggregate.

Example 5 (Claim 3) Styrene acrylic resin 100 parts by weight Phthalocyanine pigment 8 parts by weight A toner pigment having the above formulation is mixed with a mixer, and the mixture is extruded at about 200 ° C. with an extruder. After melt-kneading, the mixture was cooled and solidified, and the cooled melt-kneaded product was roughly pulverized by a hammer mill into particles of 200 to 2000 μm. This coarsely pulverized material was used as a material to be pulverized, and pulverized by a pulverizer and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder.

Compressed gas supply nozzle 2 of impingement type air flow crusher
Compressed air at a pressure of 0.882 MPa is introduced from the crushed material supply port 1 shown in FIG.
Supplied at the rate of The obtained pulverized material 10 was sent to a classifier 13 to remove the fine powder as a classified powder, and the coarse powder was again fed into the accelerating tube 3 together with the powder raw material from the pulverized material supply port 1 as the pulverized material 6.

The accelerating tube 3 shown in FIG.
= 9 mm, L = 25D, θ = 7 °, θ ₁ = 12.8 °,
Using those theta ₂ = 1 °, as the collision member, jet from the acceleration tube 3 is caused to drift, shape impinging while being dispersed, using a collision member 4 ₂ shown in FIG. 6, the continuous operation went. As a result, the volume average particle size was 9 μm, and the particle size was 4 μm.
A fine powder having an amount of generated fine powder of 16 μm or less was obtained.

Example 6 (According to Claim 4) The material 6 to be pulverized in the same manner as in Example 5 was pulverized by a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
28 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 shown in FIG.
= 9 mm, L = 18.5D, θ = 5 °, θ ₁ = 8.9
°, using those theta ₂ = 1 °, as the collision member, jet from the acceleration tube 3 is caused to drift, shape impinging while being dispersed, using a collision member 4 ₂ shown in FIG. 6, 12 A continuous operation for hours was performed. As a result, the volume average particle size was 9 μm.
Thus, fine powder having a particle size of 4 μm or less and a generation amount of fine powder of 14% of the whole was obtained.

Example 7 (According to Claim 5) The material 6 to be ground as in Example 5 was ground by a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air with a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer, and FIG.
30 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be crushed 6 was fed into the acceleration tube 3 together with the powder raw material from the material to be crushed supply port 1.

The accelerating tube 3 is shown in FIG.
= 9 mm, L = 18.5D, θ = 3.5 °, θ ₁ = 6
°, using those theta ₂ = 1 °, as the collision member, using jet drift from the acceleration tube 3, none of the variance of the shape impinging directly without generating a collision member 4 ₁ shown in FIG. 5 And 1
A continuous operation for 2 hours was performed. As a result, the volume average particle size was 9 μm, and the amount of fine powder having a particle size of 4 μm or less was 1
A fine powder of 2% was obtained.

Example 8 (according to claim 6) The same pulverized material 6 as in Example 5 was pulverized by a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air at a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer.
34 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 and the collision member include:
The same shape and dimensions as in Example 5 were used.
In this embodiment, as shown in FIG. 3, the throat 2 a of the accelerating tube 3 is connected to L _1.
A 12-hour continuous operation was performed using a part that can be divided at the position. As a result, a fine powder having a volume average particle diameter of 9 μm and an amount of fine powder having a particle diameter of 4 μm or less of 16% of the whole was obtained.

COMPARATIVE EXAMPLE 3 Pulverization was carried out on a material 6 to be pulverized in the same manner as in Example 5 using a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air with a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer, and FIG.
20 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 shown in FIG.
= 9 mm, L = 25D, θ = θ ₁ = θ ₂ = 7 °, and as a collision member, the jet from the accelerating tube 3 is deflected and collides while being dispersed, as shown in FIG. using the collision member 4 ₂ shown, was continuously operated for 12 hours. As a result, a fine powder having a volume average particle diameter of 9 μm and an amount of fine powder having a particle diameter of 4 μm or less of 18% of the whole was obtained.

COMPARATIVE EXAMPLE 4 Pulverization was carried out on a material 6 to be pulverized in the same manner as in Example 5 using a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air with a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the impingement type air flow pulverizer, and FIG.
17 kg / H of the material 6 to be ground from the material supply port 1 shown in FIG.
r. The obtained pulverized material 10 is classified into a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The material to be pulverized 6 was fed into the accelerating tube 3 together with the powder raw material through the supply port 1 for the material to be pulverized.

The accelerating tube 3 shown in FIG.
= 9 mm, L = 25D, θ = θ ₁ = θ ₂ = 7 °, and the collision member has a shape in which the jet flow from the acceleration tube 3 directly collides without generating any drift or dispersion. FIG.
Using the collision member 4 ₁ shown in, was continuously operated for 12 hours. As a result, the volume average particle size was 9 μm, and the particle size was 4 μm.
A fine powder having an amount of fine powder having a size of 14 μm or less was obtained.

The grinding and classification conditions and results of Examples 1 to 8 and Comparative Examples 1 to 4 are shown in Tables 1 and 2 below, respectively.
Shown in

[0056]

[Table 1]

[0057]

[Table 2]

[0058]

As is apparent from the above description, claim 1
According to a collision type air pulverizer having a vacuum unit supply pulverizing nozzle according to 5, the high-pressure gas is accelerated to supersonic by the nozzle angle theta ₁ with the accelerating nozzle, the speed is within the nozzle by nozzle angle theta ₂ Since the crushing and the crushing are performed in a state where the crushing is uniformly performed and the scattered particles are scattered in the colliding member, there is an effect that the crushing can be performed with little variation and high efficiency. Further, according to the collision type airflow pulverizer of claims 1 to 5, when a high-pressure airflow having the same energy is used, the energy used for the pulverization can be effectively derived, and the pulverization processing capacity is improved, Since the generation of fine powder due to excessive pulverization can be prevented, a pulverized product having a narrow particle size distribution can be obtained. In addition, by appropriately changing and setting the pressure of the high-pressure gas, pulverization suitable for the properties of the object to be pulverized becomes possible, and pulverization with high yield and high productivity can be performed. According to the collision type air current pulverizer according to the sixth aspect, since the acceleration tube is configured by combining a plurality of annular bodies that can be disassembled and assembled, it is optimal according to the use and the type of the object to be pulverized. An acceleration nozzle having a shape can be easily selected and configured. As described above, the pulverizer of the present invention can be very effectively applied to the production of fine powder products having a particle size of micron units, such as resins, agricultural chemicals, cosmetics, and pigments.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a configuration example of a jet nozzle in a collision type air current pulverizer of the present invention.

FIG. 2 is a schematic vertical sectional view showing another example of the configuration of the ejection nozzle in the collision type air flow pulverizer of the present invention.

FIG. 3 is a schematic longitudinal sectional view showing still another example of the configuration of the ejection nozzle in the collision-type airflow pulverizer of the present invention.

FIG. 4 is a schematic explanatory view of a pulverizing device including a collision type air flow pulverizer and a classifier.

FIG. 5 is a schematic explanatory view showing an example of a collision member in the collision type air current pulverizer of the present invention.

FIG. 6 is a schematic explanatory view showing another example of a collision member in the collision-type airflow pulverizer of the present invention.

FIG. 7 is a schematic longitudinal sectional view showing an example of an effective distance configuration of an acceleration tube in the collision type air current pulverizer of the present invention.

FIG. 8 is a schematic longitudinal sectional view showing another example of the effective distance configuration of the accelerating tube in the impingement type air current pulverizer of the present invention.

[Explanation of symbols]

1 object to be crushed supply opening 2 compressed gas supply nozzle 2a throat 2b, 3a point 3 accelerating tube 3b effective outlet 3c spread outlet 3d, 3e toroid 4,4 _1, 4 ₂ collision member 5 outlet 6 object to be crushed 7 Crushing chamber 8 Acceleration tube outlet 9 Collision surface 10 Crushed material 11,12 Path 13 Classifier 14 High-speed airflow C Common center line D Throat diameter L Effective length of accelerator tube θ Spread angle

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-60150 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B02C 19/06

Claims (6)

(57) [Claims] 1. A crusher comprising a compressed gas supply nozzle, an acceleration pipe connected to the supply nozzle and having a crushed object supply port, and a collision member for colliding and crushing the crushed object. As for the pipe, the effective distance (effective length of the acceleration pipe) along the common center line between the supply nozzle and the acceleration pipe from the throat of the compressed gas supply nozzle to the effective outlet of the acceleration pipe is L,
For the accelerator tube, the distance from the throat is 1 / the effective distance L
Is 2, the distance along the common center line and L _1, also the inner circumferential surface of the acceleration tube, the angle between the line connecting the throat and the effective outlet portion and the common center line twice the intended (acceleration the divergence angle) of the tube and theta, further, the inner peripheral surface of the accelerating tube from the throat, the distance along a common center line accelerating tube circumference on the point on the throat inner peripheral surface of a L ₁ A line connecting the points,
When the angle formed by the angle with the common center line is doubled to be θ ₁ , an impulse type air current pulverizer is provided that has an accelerating tube that satisfies a relational expression represented by the following [Equation 1]. Machine. [Number 1] Ltan (θ / 2) ≧ L 1 tan (θ 1/2)
> (1/2) Ltan (θ / 2) 2. A relational expression expressed by the following [Equation 2] holds between the diameter D of the throat, the effective length L of the acceleration tube, and the divergence angle θ of the acceleration tube, and , Θ is 1 ° to 7
2. The impingement type air current pulverizer according to claim 1, having a gently expanding shape in which L is in a range of 8D to 30D in degrees. 3. 1.8D ≧ Ltan (θ / 2) ≧ 0.13D 3. The pulverizer is provided with a collision member having a shape in which a jet from an accelerating tube generates a drift and collide while being dispersed, and uses a compressed gas having a pressure of 0.7 MPa or more. The following equation (3) holds between the diameter D of the throat, the effective length L of the accelerating tube, and the divergence angle θ of the accelerating tube, and the angle θ is 2 ° to 7 °. so,
The impingement type air current pulverizer according to claim 2, wherein L has a gentle spreading shape in a range of 10D to 30D. ## EQU3 ## 1.8D ≧ Ltan (θ / 2) ≧ 0.19D 4. The pulverizer includes a collision member having a shape in which a jet from an accelerating tube generates a drift and collide while being dispersed, and uses a compressed gas having a pressure of 0.7 MPa or less. A relational expression expressed by the following [Equation 4] holds between the diameter D of the throat, the effective length L of the accelerating tube, and the spread angle θ of the accelerating tube, and the angle θ is 2 ° to 7 °. so,
The impingement-type airflow pulverizer according to claim 2, wherein L has a gentle spreading shape in a range of 8D to 25D. ## EQU4 ## 1.2D ≧ Ltan (θ / 2) ≧ 0.19D 5. The pulverizer includes a collision member having a shape in which a jet from an acceleration tube collides directly without generating any drift or dispersion. The acceleration tube has a throat diameter D and an effective diameter of the acceleration tube. A relational expression expressed by the following [Equation 5] holds between the length L and the divergence angle θ of the accelerator tube, and when the angle θ is 1 ° to 5 °, L
The impingement type air-flow crusher according to claim 2, wherein the crusher has a gently expanding shape in a range of 8D to 30D. ## EQU5 ## 0.78D ≧ Ltan (θ / 2) ≧ 0.13D 6. The acceleration tube is formed by connecting a plurality of annular bodies in a longitudinal direction of the acceleration tube and connecting them.
The impingement type air current pulverizer according to claim 1, 2, 3, 4, or 5, wherein the plurality of annular bodies can be divided from each other.