JP3091281B2 - 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 flow pulverizer for finely pulverizing a powder material by using a jet air flow (high-pressure gas) equipped with an air flow classifier.

[0002]

2. Description of the Related Art In general, an impingement type air flow pulverizer using a jet airflow generally mixes a powder material with a jet airflow to form a particle mixed airflow, and then ejects the mixture from an outlet of an acceleration tube. The material is made to collide with a collision surface of a collision member provided in front of the outlet, and the powder material is finely pulverized by the impact force. Hereinafter, the details thereof will be described based on the conventional collision-type airflow pulverizer shown in FIGS. 8 and 9. In the conventional collision type airflow pulverizer, a collision member 24 is provided to face an outlet 23 of an acceleration tube 22 to which a high-pressure gas supply nozzle 21 is connected. Raw material supply port 2 that is connected to the
5, the powder raw material is sucked into the accelerating tube 22 and ejected together with the high-pressure gas to collide with the collision surface of the collision member 24 and to be pulverized by the impact.

[0003]

However, in the above-mentioned prior art, since the supply port 25 for the powder raw material is provided only at one place communicating with the middle of the acceleration tube 22, the acceleration tube 2 is not provided.
The powdered raw material sucked and introduced into the inside 2 is supplied to the powder material supply port 2.
Immediately after passing through 5, the high-pressure gas stream ejected by the high-pressure gas supply nozzle 21 is dispersed in the high-pressure gas stream while rapidly changing the flow path toward the acceleration pipe outlet 23, and is rapidly accelerated. In this state, relatively coarse particles of the powder raw material pass through the low flow portion of the accelerating tube 22 under the influence of the inertial force, while relatively fine particles of the powder raw material pass through the high flow portion of the accelerating tube 22. , The powder material is not sufficiently uniformly dispersed in the high-pressure airflow. As a result, the powder material exits the accelerating tube 22 while being separated into a flow having a high powder material concentration and a flow having a low powder material concentration, and the powder material collides with the opposing collision member 24 in a partially concentrated manner. And there is a problem that the processing capacity is reduced. Further, in the above conventional example, the collision member 2
The crushed material crushed by colliding with the collision surface 29 of the No. 4 collides secondary (or tertiary) with the inner wall of the crushing chamber and is further finely crushed. However, since the crushing chamber 31 is box-shaped, it is efficient. There was a drawback that secondary collision was not performed and the pulverization processing ability could not be improved.

[0004] In addition, the collision member 2 in the conventional pulverizer is used.
The collision surface 29 of No. 4 is in the direction of the mixed gas flow on which the powder raw material is loaded, that is, a flat surface as shown in FIG. 8 or a flat plate inclined at 45 degrees as shown in FIG. (Japanese Patent Application Laid-Open Nos. 57-50554 and 58
-143853), but these have the following disadvantages. That is, as shown in FIG. 8, when the collision surface 29 has the collision surface 29 perpendicular to the axial direction of the acceleration tube 22, the powder raw material blown out from the outlet 23 of the acceleration tube 22 is reflected by the collision surface 29. There is a problem that the ratio of coexistence with the pulverized material near the collision surface 29 increases, and the powder (powder raw material and pulverized material) concentration near the collision surface 29 increases, resulting in poor pulverization efficiency. Further, in the pulverizer as shown in FIG. 9, since the collision surface 30 is inclined at 45 degrees with respect to the axial direction of the acceleration tube 22, the powder concentration near the collision surface 30 is reduced as shown in FIG. However, in this case, there is a problem that the impact force due to the high-pressure air flow is dispersed and reduced as compared with the crusher of FIG. Further, in the pulverizer as shown in FIG. 9, there is also a problem that the secondary collision with the pulverization chamber wall 31 cannot be effectively used. For example, the angle of the collision surface 30 shown in FIG.
In the case where the material is inclined 45 degrees with respect to 2, there is little problem when finely pulverizing a powdery raw material such as a thermoplastic resin, but the impact force required for pulverization at the time of collision is small. Since the pulverization by the next collision is small, the pulverization ability is about 1/2 to 1 / 1.5 as compared with the pulverizer of FIG.
The crushing ability drops.

Various classifiers have been proposed as an airflow classifier connected to the above-mentioned collision type airflow pulverizer. A typical example is a dispersion separator as shown in FIG. Pneumatic Industries) is generally used. In brief, the powder material introduced from the powder supply cylinder together with the conveying air is introduced into a classifying chamber 150 in which a graded plate 100 having a high central portion is provided at the bottom thereof. In the above, the powder material is swirled by an airflow flowing together with the powder material, centrifuged into fine powder and coarse powder through a classification louver 90, and the fine powder is a fine powder discharge chute provided at the center of the classification plate 100. 120, and the coarse powder is
Is discharged from a coarse powder discharge port 110 provided in the outer peripheral portion of the main body. However, such a conventional air classifier has the following problems. That is, as shown in FIG.
The powder material supply section to the classifying chamber 150 of this type of airflow classifier has a cyclone-like shape, and the upper cover 60
A guide cylinder 54 is provided upright at the center of the upper surface, and a supply cylinder 80 is connected to the upper outer peripheral surface of the guide cylinder 54, and the supply cylinder 80 is supplied through the supply cylinder 80. The incoming powder material is connected so as to be introduced in the tangential direction of the inner circumference of the guide cylinder 54. Therefore, when the powder material is supplied from the supply cylinder 80 into the guide cylinder 54, the powder material falls while rotating along the inner peripheral surface of the guide cylinder 54. In this case, since the powder material falls in a belt shape from the supply cylinder 80 along the inner peripheral surface of the guide cylinder 54, the distribution and concentration of the powder material flowing into the classification chamber 150 become uneven (the classification chamber 150).
The powder material flows only from a part of the inner peripheral surface of the guide cylinder 54), which causes a problem that the dispersion of the powder material is poor. In addition, when the processing amount is large, the aggregation of the powder material is more likely to occur, and the dispersion is not sufficiently performed, so that there is a problem that high-precision classification cannot be performed. Furthermore, when the amount of air that conveys the powder material is large, the amount of air that flows into the classifying chamber 150 also increases, so that the velocity of the particles turning in the classifying chamber 150 toward the center increases, and the diameter of the separated particles increases. There is a problem. Therefore, usually, as a method of reducing the separation particle diameter, a cylinder 140 provided above the guide cylinder 54 is used.
In this case, air is controlled by a damper to extract air. However, if the amount of air extracted at this time is large, a part of the powder material is also discharged, which may cause a practical problem of loss.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, to provide a high-precision airflow classifier,
It is an object of the present invention to provide a novel collision-type airflow pulverizing apparatus including a collision-type airflow pulverizer that can efficiently pulverize a powder material.

[0007]

The above objects are achieved by the present invention described below. That is, the present invention provides: (i) a classifying chamber in which a powder material introduced from a powder supply cylinder together with conveying air is swirled by an inflowing air flow and centrifuged into fine powder and coarse powder through a classification louver; (Ii) an acceleration tube for conveying and accelerating the powder material by high-pressure gas, and a collision member having a collision surface for crushing the powder ejected from the acceleration tube by a collision force. And a collision-type airflow pulverizer, wherein the collision member is provided to face the acceleration tube outlet, and an impingement-type airflow pulverizer unit provided with the collision member. The fine powder is discharged from the fine powder discharge chute connected to the discharge port provided at the center of the inclined classification plate provided at the bottom, and the coarse powder is discharged from the coarse powder discharge port formed at the outer periphery of the classification plate. It has a structure and supplies powder to the upper part of the classification chamber An annular guide chamber communicated with the cylinder is provided, and a plurality of louvers each having a tip directed in a tangential direction in an inner circumferential direction of the guide chamber are provided between the guide chamber and the classifying chamber, An impingement type air current pulverizer is provided between a throat portion of the acceleration tube having a Laval shape and an outlet of the acceleration tube, and a plurality of (n ≧ 2) powder material supply ports extending in the entire circumferential direction of the acceleration tube. A powder raw material supply port comprising holes is provided, and the cross-sectional shape of the grinding chamber is substantially circular or elliptical, and further, a pulverized material discharge port is provided behind the collision member, In addition, the coarse powder discharge port of the airflow classifier section is communicated with the powder material supply port of the collision type airflow pulverizer section, and the pulverized material discharge port of the collision type airflow pulverizer section is connected to the powder of the airflow classifier section. A collision type airflow pulverizer, which is connected to a body supply cylinder.

[0008]

The impingement airflow pulverizer of the present invention comprises an airflow classifier section and an impingement airflow pulverizer section, both parts having a specific structure, and a coarse centrifugally separated by the airflow classifier section with high accuracy. The discharge port of the powder is connected to the powder material supply port of the impingement type air current pulverizer with excellent grinding efficiency, and the pulverized material outlet of the impingement type air flow pulverizer is connected to the powder supply cylinder of the air flow classifier. , The powder material can be pulverized very efficiently and with high precision as compared with the conventional collision type air flow pulverizer. That is, the present inventors have conducted intensive studies to solve the problems of the conventional airflow classifier, and as a result, provided an annular guide chamber communicating with the powder supply cylinder at the upper part of the classifier, and provided the guide chamber with the classifier. It has been found that the dispersibility of the powder material can be improved and a high-precision classification can be performed by providing a plurality of louvers whose tips are directed tangentially in the inner circumferential direction of the guide chamber between the chamber and the chamber. Also, the present inventors
As a result of intensive research to solve the problems of the conventional impingement airflow pulverizer, powder material was supplied between the throat of the Laval-shaped accelerating tube and the outlet of the accelerating tube in the entire circumferential direction of the accelerating tube. Port or a plurality of (n ≧ 2) powder material supply ports, and the grinding chamber has a substantially circular or elliptical cross-sectional shape, and more preferably, the central axis of the accelerating tube has a vertical direction. For example, it is possible to uniformly disperse the powder material in the high-pressure airflow so as not to cause a bias in the concentration, and to uniformly collide with the collision surface of the collision member facing the acceleration tube. It was found that the powder material can be efficiently pulverized by the impact force at the time.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing one embodiment of a collision-type airflow pulverizer of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 1, FIG. 3 is a cross-sectional view taken along the line CC ′ of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB ′ of FIG. FIG. 5 is a cross-sectional view of FIG.
It is sectional drawing in the 'line.

[0010] The collision-type airflow pulverizer of the present invention is characterized by comprising an airflow classifier having a specific structure described below and a collision-type airflow pulverizer. First, the collision-type airflow pulverizer of the collision-type airflow pulverizer of the present invention will be described with reference to FIG. As shown in FIG. 1, the collision type air flow crusher of the apparatus of the present invention includes a raw material supply port 1, a high pressure gas storage tank 2, an acceleration tube 3, a collision member 4, a crushing chamber 5, and a crushed material discharge port 6. You. The operation of the high-pressure gas in the impingement type air-flow crusher will be described. First, the high-pressure gas enters through the inlets 7 on the left and right sides of the high-pressure gas storage tank 2, and after pulsation such as pressure fluctuation is made uniform, the raw material supply port 1 is turned on. Flows from the Laval nozzle 9 provided at the center of the accelerating tube 3 (shown in FIG. 4). Accelerator tube 3
The high pressure gas that has flowed into the accelerating tube 3 is accelerated to the supersonic range while expanding, because it also has a flared Laval shape similar to the Laval nozzle 9. During this process, the high-pressure gas is depressurized, and the pressure of the gas at the time of exiting the acceleration tube 3 becomes substantially the same as the pressure of the pulverizing chamber 5. On the other hand, in the grinding chamber 5 having a circular or elliptical shape, as is apparent from the cross-sectional view taken along the line CC ′ of FIG. 5, a suction flow is generated. Then, the surface of the collision member 4 is reduced in pressure by the action of the suction flow. Then, by such a pressure reducing action on the surface of the collision member 4, the jet flow from the acceleration tube 3 is further accelerated and collides with the surface of the collision member 4. At this time, since the collision surface of the collision member 4 has a cone shape with a vertex angle in a range of 110 to 175 degrees, the jet colliding with the collision member 4 centers around the vertex of the conical member. It is radially diffused between the collision member 4 and the wall of the crushing chamber 5. The diffused air flow is guided to the outlet 6 of the crushing chamber 5 while riding on the suction flow in the crushing chamber 5 described above.

Next, the action of the supplied powdery raw material in the impingement type air current pulverizer will be described. The powder raw material to be pulverized is supplied from above the raw material supply port 1. Then, the supplied powder raw material is sucked and discharged from the lower part of the raw material supply port 1 to the acceleration tube 3. The principle of suction and discharge of the raw material at this time is based on the ejector effect by the expansion and decompression of the high-pressure gas in the accelerating tube. At this time, in the collision type air flow pulverizer section of the collision type air flow pulverizer apparatus of the present invention, in order to sufficiently disperse the powder raw material and suck the powder raw material into the acceleration tube 3, the acceleration tube 3 having a Laval shape is used. Between the throat portion of the cylinder and the outlet of the accelerating tube 3 as shown in FIG.
The raw material supply port 1 extending in the entire circumferential direction of FIG.
As shown in FIG. 2B, a powder material supply port 1 having a plurality of holes (n ≧ 2) is provided (in FIG. 2B, n = 2).
4) The powder raw material is sufficiently dispersed and accelerated by the high-pressure airflow. On the other hand, in the conventional collision-type air-flow pulverizer as shown in FIGS.
Is provided only at one location and communicated in the middle of the accelerating tube 22, and the powder raw material sucked and introduced into the accelerating tube 22 is
Immediately after passing through the raw material supply port 25, the high pressure gas supply nozzle 21
The high-pressure airflow gushes from the
While the flow path is rapidly changed in the direction of, it is dispersed in the high-pressure air flow and is rapidly accelerated, so it is separated into a high flow and a low flow of the powder material concentration and is sufficiently dispersed. Was not accelerated. The powder raw material dispersed and sucked in the accelerating tube 3 in this manner is completely dispersed by the high-speed airflow radiated from the Laval nozzle 9 provided at the center of the raw material supply port 1.

Next, the powder material dispersed as described above is accelerated by a high-speed airflow flowing inside the accelerating tube 3 and becomes a supersonic solid-gas mixed flow. After flowing out of the accelerating tube 3, this mixed gas-solid stream becomes a solid-gas mixed jet, and collides with the collision member 4 under the same action as the above jet. The raw material coarse powder is finely pulverized by this collision. The pulverized material is then further pulverized by secondary collision at the wall of the pulverizing chamber 5, and in some cases, the pulverized substance is transported to the outlet 6 of the pulverizing chamber 5 and the pulverized material by the collision member. A tertiary (and quaternary) collision with the four sides occurs and is further comminuted. In particular, in the collision-type airflow pulverizer of the apparatus of the present invention, since the cross-sectional shape of the pulverizing chamber 5 has a circular or elliptical shape, pulverized material dispersed in substantially the entire circumferential direction from the collision surface is pulverized. Secondary collision occurs efficiently with the wall of the room 5, and the crushing efficiency is further improved. Further, the collision member 4 of the collision-type airflow pulverizer of the apparatus of the present invention.
Since the tip of the collision surface has a pyramid shape with an apex angle in the range of 110 to 175 degrees, for example, even when the raw material is a powder containing a resin or a sticky material, it is fused. Also, problems such as aggregates and coarse particles do not occur. Further, since the impingement type air current pulverizer of the apparatus of the present invention can uniformly disperse the powder material in the high-speed air current, even when the powder material containing the abrasive material is pulverized, The occurrence of local wear on the inner wall and the collision surface of the collision member 4 can be prevented, and more stable operation can be performed.

Next, an airflow classifier which is another component of the apparatus of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 41 denotes a cylindrical main body casing, reference numeral 42 denotes a lower casing, and a hopper 43 for discharging coarse powder is connected to a lower portion of 42. A classifying chamber 44 is provided inside the main body casing 41. The upper part of the classifying chamber 44 is closed by an annular guide chamber 45 attached to the upper part of the main body casing 41 and a conical (umbrella-shaped) upper cover 46 having a raised central part. A plurality of louvers 47 (illustrated in FIG. 5) arranged in the circumferential direction are provided on a partition wall between the classifying chamber 44 and the guide chamber 45, and the powder fed from the supply tower 48 into the guide chamber 45 is provided. The material and air are swirled into the classifying chamber 44 from between the louvers 47 and flow therethrough. Note that it is necessary to distribute the air and the powder material flowing in the guide chamber 45 evenly between the louvers 47 in order to accurately classify them. Further, the flow path to reach the louver 47 needs to have a shape in which concentration by centrifugal force is difficult to occur. In the example of FIG. 1, the supply cylinder 48 is connected in an upward direction perpendicular to the horizontal plane of the classification chamber 44, but the invention is not limited to this. In this way, in the airflow classifier used in the apparatus of the present invention, the air and the powder material are supplied to the classification chamber 44 via the louver 47. Significant dispersion enhancement is achieved with the material over conventional approaches. Further, the louver interval can be arbitrarily adjusted.

Further, in the airflow classifier used in the apparatus of the present invention, a classification louver 49 arranged in the circumferential direction is also provided at a lower portion of the main body casing 41, and classification air for generating a swirling flow from the outside to the classification chamber 44 is supplied. Introduced via classification louvers 49. At the bottom of the classifying chamber 44, a conical (umbrella-shaped) classifying plate 50 having a raised central portion is provided.
A coarse powder discharge port 51 is formed around the outside. Also, the classifying plate 50
In the center of the fine powder discharge chute 5 connected to the fine powder discharge port
2, the lower end of the fine powder discharge chute 52 is bent into an L-shape, and the bent end is positioned outside the side wall of the lower casing 42. Further, the fine powder discharge chute 52 is connected to a suction fan (not shown) via fine powder collecting means such as a cyclone or a dust collector, and applies a suction force to the classifying chamber 44 by the suction fan to generate the louver 49. The swirling flow required for classification is caused by the suction air flowing into the classification chamber 44 from between. Since the airflow classifier used in the apparatus of the present invention has the above-described structure, when the powder material is supplied from the supply cylinder 48 to the guide cylinder 45 together with air, the air containing the powder material is guided. Room 4
5 and between the louvers 47, and is swirled into the classification chamber 44 while being dispersed at a uniform concentration. The powdered material swirled into the classifying chamber 44 is then generated by a suction fan connected to the fine powder discharge chute 52, and the suction air flow flowing from between the classifying louvers 49 at the lower part of the classifying chamber 44. To get more turns,
The particles are efficiently centrifuged into coarse powder and fine powder by the centrifugal force acting on each particle. At this time, the coarse powder turning around the outer periphery of the classification chamber 44 is discharged from the coarse powder discharge port 51 and discharged from the lower hopper 43. The fine powder moving to the center along the upper inclined surface of the classification plate 50 is discharged from the fine powder discharge chute 52 to fine powder collecting means (not shown). In the airflow classifier used in the apparatus of the present invention, all the air flowing into the classification chamber 44 together with the powder material flows in the form of a swirling flow. The separation is relatively small compared to the centrifugal force, and the classification is performed with a small separation particle diameter in the classification chamber 44, so that the fine powder having a very small particle diameter can be discharged to the fine powder discharge chute 52. In addition, since the powder material flows into the classification chamber 44 at a substantially uniform concentration, fine powder having a fine distribution can be obtained.

The impingement type air flow pulverizer of the present invention comprises the above-described impingement type air flow pulverizer and an air flow classifier connected as shown in FIG. That is, the coarse powder discharge port 51 of the airflow classifier section is connected to the pulverized material supply port 1 of the collision type airflow pulverizer section, and the pulverized substance discharge port 6 of the collision type airflow pulverizer section is connected to the airflow classifier section. By being connected to the powder supply cylinder 48, the pulverized material efficiently pulverized by the collision type air flow pulverizer is introduced into the air flow classifier, and the particle size is extremely small.
Moreover, only the fine powder having a fine distribution
, And the other coarse powder is re-introduced into the impingement airflow pulverizer and re-pulverized, and has a very small particle size.
In addition, grinding is repeated until a fine powder having a fine distribution is obtained. Incidentally, in the collision type airflow pulverizer of the present invention,
The raw material for pulverization is introduced from the raw material introduction port 53 of FIG. 1 by an appropriate introduction means.

[0016]

As described above, the collision type air flow pulverizer of the collision type air flow pulverizer of the present invention has a more devised method of supplying the raw material to the acceleration tube than the conventional one, so that the material to be ground is It is more strongly dispersed, accelerated and introduced into the grinding chamber. Further, since the back pressure of the crushing chamber is low, it is possible to cause the crushed object to collide with the collision member more quickly. As a result, it is possible to improve the pulverization efficiency. In addition, the collision type airflow pulverizer of the collision type airflow pulverizer of the present invention is designed to reduce the dust concentration by devising the shape of the pulverization chamber and by strongly dispersing the pulverized material. Fusing and abrasion are greatly reduced as compared with the conventional collision type airflow pulverizer, and stable operation can be achieved. Further, in the airflow classifier of the collision type airflow pulverizer according to the present invention, classification with a small separation particle size is performed in a classification chamber, and a fine powder having a very small particle size and a fine distribution can be obtained. Therefore, the collision-type airflow pulverizer of the present invention can efficiently pulverize the powder raw material, and can accurately recover the pulverized fine powder.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a collision type airflow pulverizer of the present invention.

FIG. 2A is a cross-sectional view taken along line AA ′ in FIG. 1 in a case where a raw material supply port extends in the entire circumferential direction of an acceleration tube. FIG. 2B is a cross-sectional view taken along the line AA ′ in FIG. 1 in an example in which the raw material supply port includes n = 4 holes.

FIG. 3 is a sectional view taken along the line CC ′ of FIG. 1;

FIG. 4 is a sectional view taken along line BB ′ of FIG. 1;

FIG. 5 is a sectional view taken along line DD ′ of FIG. 1;

FIG. 6 is a projection view showing a modification of the collision member 4.

FIG. 7 is a projection view showing another modification of the collision member 4.

FIG. 8 is a schematic view showing a conventional collision type airflow pulverizer.

FIG. 9 is a schematic view showing a conventional collision type airflow pulverizer.

FIG. 10 is a schematic view showing a conventional airflow classifier.

[Explanation of symbols]

 1, 25: powder material supply port 2: high pressure gas storage tank 3, 22: acceleration tube 4, 24, 28: collision member 5, 26, 31: crushing chamber 6, 27: crushing chamber outlet 7: high pressure gas inlet 8: High-pressure gas communication passage 9: Laval nozzle 21: high-pressure gas supply nozzle 23: acceleration pipe outlet 29, 30: collision surface 41, 101: classifier main body casing 42, 70: classifier lower casing 43: coarse powder discharge hopper 44, 150: Classification room 45: Guide room 46, 60: Upper cover 47, 49, 90: Louver 48, 80: Supply cylinder 50, 100: Classification plate 51, 110: Coarse powder discharge port 52, 120: Fine powder discharge sheet 53: Raw material introduction Part 54: guide cylinder 130: coarse powder discharge hopper 140: upper part of guide cylinder

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-117971 (JP, A) JP-A-3-206466 (JP, A) JP-A-1-254266 (JP, A) (58) Survey Field (Int. Cl. ⁷ , DB name) B02C 19/00 B02C 19/06

Claims (3)

(57) [Claims] (1 ) A classifying chamber is provided in which a powder material introduced from a powder supply cylinder together with conveying air is swirled by an incoming air flow and centrifugally separated into fine powder and coarse powder via a classification louver. It has a air classifier unit, the impact surface for crushing by the impact force the powder ejected from the accelerating tube and, the pressurized-speed tube for conveying accelerate the powder material by (ii) a high pressure gas
A crushing chamber equipped with a collision member , and a collision-type airflow crusher comprising: a collision-type airflow crusher section in which the collision member is provided to face an acceleration tube outlet; The fine powder is discharged from the fine powder discharge chute connected to the discharge port provided at the center of the inclined classification plate provided at the bottom of the classification chamber, and the coarse powder is discharged from the coarse powder discharge port formed at the outer periphery of the classification plate. An annular guide chamber having a structure for discharging the powder and communicating with the powder supply cylinder at an upper part of the classifying chamber, and a tangent line between the guide chamber and the classifying chamber in an inner circumferential direction of the guide chamber; Characterized in that a plurality of louvers with the tip directed in the direction are provided, and the impingement type air flow pulverizer section is provided between the throat portion of the acceleration tube having a Laval shape and the exit of the acceleration tube. Powder material supply ports extending in the circumferential direction, or multiple (n ≧
2) a powder material supply port comprising a hole is provided, and the cross-sectional shape of the grinding chamber is substantially circular or elliptical;
Further, a pulverized material discharge port is provided behind the collision member, and a coarse powder discharge port of the airflow classifier section is communicated with a powder material supply port of the collision type airflow pulverizer section. And a pulverized material discharge port of the impingement type airflow pulverizer section is connected to a powder supply cylinder of the airflow classifier section. 2. The impingement type airflow pulverizer according to claim 1, wherein the central axis of the acceleration tube is vertical. 3. The shape of the tip of the collision surface of the collision member is
The collision-type airflow pulverizer according to claim 1, wherein the collision-type airflow pulverizer has a cone shape having a vertex angle in a range of 110 to 175 degrees.