JPH05154399A - Impact type air flow crusher - Google Patents

Abstract

PURPOSE:To classify with high accuracy and crush efficiently by classifying a powdery material by means of air flow flowing in through classifying louvers, providing a rough powder feeding inlet between a throat section of a speed accelerating tube of Lavel shape and an outlet and forming the section of a crushing chamber in the scroll shape. CONSTITUTION:A ring guide chamber 5 communicating with a powder feeding cylinder 8 is provided on the upper section of a classifying chamber 4, and a plurality of louvers 7 are formed between the guide chamber 5 and the classifying chamber 4 to improve the dispersing properties of a powdery material and carry out the classification of higher accuracy. A raw material feeding inlet 30 covering the whole circumferential direction of a speed accelerating tube 23 or a plurality of raw material feeding inlets 30 are provided between a throat section 31 of the speed accelerating tube 23 of Lavel shape and an outlet, and the section shape of a crushing chamber 25 is formed in the scroll shape to disperse evenly the powdery material into high pressure air flow without generating the uneven distribution of concentration, also impact uniformly the material to an impact component 24 facing the speed accelerating tube 23 and crush efficiently the material by impact force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision type air flow pulverizing apparatus for finely pulverizing a powder material by using a jet air stream (high pressure gas) equipped with an air stream classifier.

[0002]

2. Description of the Related Art In general, a collision type air flow pulverizer using a jet air flow is prepared by placing a powder raw material on a jet air flow to form a particle mixed air flow and then ejecting the particle air flow from the outlet of an accelerating tube. It collides with a collision surface of a collision member provided in front of the outlet, and the impact force thereof pulverizes the powder raw material. The details will be described below based on the conventional collision type airflow crusher shown in FIGS. 7 and 8. In the conventional collision-type airflow crusher, a collision member 34 is provided so as to face the outlet 33 of the accelerating pipe 32 to which the high-pressure gas supply nozzle 40 is connected, and the high-pressure gas supplied to the accelerating pipe 32 causes the middle of the accelerating pipe 32 to flow. Powder raw material supply port 3 communicating with the
5, the powder raw material is sucked into the accelerating pipe 32, and the powder raw material is jetted together with the high-pressure gas to collide with the colliding surface of the colliding member 24 and crushed by the impact.

[0003]

However, in the above-mentioned conventional example, since the powder raw material supply port 35 is provided at only one place so as to communicate with the middle of the accelerating pipe 32, the accelerating pipe 3 is not provided.
The powder raw material sucked into the inside 2 is the powder raw material supply port 3
Immediately after passing through 5, the high-pressure gas jetted from the high-pressure gas supply nozzle 40 rapidly disperses in the high-pressure gas stream while rapidly changing the flow path toward the accelerating pipe outlet 33, and is rapidly accelerated. In this state, the relatively coarse particles of the powder raw material pass through the low flow portion of the acceleration tube 32 due to the influence of the inertial force, while the relatively fine particles of the powder raw material flow at the high flow portion of the acceleration tube 32. As a result, the powder raw material is not sufficiently uniformly dispersed in the high-pressure air stream. For this reason, the powder material comes out of the accelerating tube 32 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 collision member 34 partially concentrating, and the pulverization efficiency is improved. However, there is a problem in that the processing power is lowered. Further, in the above conventional example, the collision member 3
The crushed material that has been crushed by colliding with the collision surface 39 of No. 4 collides with the inner wall of the crushing chamber 41 secondary (or tertiary) and is further finely pulverized, but since the crushing chamber 41 is a box type, it is efficient. However, there is a drawback that secondary crushing does not occur and the fine pulverization processing capacity cannot be improved.

Further, the collision member 3 in the conventional crusher has been used.
The collision surface 39 of No. 4 is in the direction of the particle mixed air flow on which the powder raw material is placed, that is, at a right angle to the acceleration tube 32 as shown in FIG. 7 or a flat plate inclined at 45 degrees as shown in FIG. (See Japanese Patent Application Laid-Open Nos. 57-50554 and 58)
However, these have the following drawbacks. That is, as shown in FIG. 7, when the collision surface 39 perpendicular to the axial direction of the acceleration tube 32 is provided, the powder material blown out from the outlet 33 of the acceleration tube 32 and the collision surface 39 are reflected. The ratio of coexistence with the pulverized material near the collision surface 39 increases, and the concentration of the powder (powder raw material and pulverized material) near the collision surface 39 increases, resulting in a problem of poor pulverization efficiency. Further, in the crusher as shown in FIG. 8, since the collision surface 39 is inclined at 45 degrees with respect to the axial direction of the acceleration tube 32, the powder concentration in the vicinity of the collision surface 39 is as shown in FIG. However, in this case, there is a problem that the collision force due to the high pressure air flow is dispersed and reduced as compared with the crusher of FIG. Further, in the crusher as shown in FIG. 8, there is a problem that it cannot be said that the secondary collision with the crushing chamber wall 41 is effectively used. For example, in the case where the angle of the collision surface 39 shown in FIG. 8 is inclined 45 degrees with respect to the accelerating tube 32, there are few problems when finely pulverizing a powder raw material such as a thermoplastic resin,
Since the impact force required for crushing at the time of collision is small and the crushing due to the secondary collision with the crushing chamber wall 41 is small, the crushing capacity is 1/2 to 1/1. About 5,
The crushing ability drops.

Various classifiers have been proposed as an air classifier connected to the above-mentioned collision type air flow crusher, but a typical one is a dispersion separator (Japan) as shown in FIG. Pneumatic Industrial Co., Ltd.) is generally used. As an outline thereof, the powder material introduced from the powder supply cylinder together with the carrier air is introduced into the classification chamber 150 in which the inclined classification plate 100 having a high central portion is provided at the bottom thereof, and the classification chamber 150 is provided. In the above, the powder material is swirlingly flowed by the air flow that flows in together with the powder material, and is centrifugally separated into fine powder and coarse powder through the classification louver 90, and the fine powder is a fine powder discharge chute provided in the central portion of the classification plate 100. The coarse powder is discharged from 120 and is discharged from the coarse powder outlet 110 provided on the outer peripheral portion of the classification plate 100. However, such a conventional airflow classifier has the following problems. That is, as shown in FIG. 9, the powder material supply unit to the classification chamber 150 of this type of airflow classifier is
The guide cylinder 50 has a cyclone shape, and the guide cylinder 50 is provided upright in the center of the upper surface of the upper cover 60.
A supply cylinder 80 is connected to the upper outer peripheral surface of the, and the powder material supplied through the supply cylinder 80 is introduced in the tangential direction of the inner circumference of the guide cylinder 54. It is connected to come. Therefore, when the powder material is supplied from the supply cylinder 80 into the guide cylinder 50, the powder material is supplied to the guide cylinder 5.
While turning along the inner circumference of 0, it falls. In this case, the powder material falls in a strip shape from the supply cylinder 80 along the inner peripheral surface of the guide cylinder 50, so that the distribution and concentration of the powder material flowing into the classification chamber 150 becomes nonuniform (the classification chamber The powder material flows into the guide tube 50 only from a part of the inner peripheral surface of the guide cylinder 50), and there is a problem that the powder material is not well dispersed. Further, when the treatment amount is large, the powder material is more likely to be aggregated, and further, the dispersion is not sufficiently performed, so that there is a problem that the highly accurate classification cannot be performed. Furthermore, when the amount of air carrying the powder material is large, the amount of air flowing into the classifying chamber 150 also increases, so that the velocity of the particles swirling in the classifying chamber 150 toward the center increases and the separated particle diameter increases. There is a problem. Therefore, as a method for reducing the diameter of the separated particles, a tube 140 provided above the guide tube 50 is usually used.
The air is controlled by a damper to remove the powder, but if the amount of air removed at this time is large, a part of the powder material is also discharged, which may cause a practical problem of loss.

An object of the present invention is to solve the above-mentioned problems of the prior art, to provide a highly accurate air flow classifier section, and
It is an object of the present invention to provide a novel collision-type airflow crushing device including a collision-type airflow crusher unit capable of efficiently pulverizing powder raw materials.

[0007]

The above objects can be achieved by the present invention described below. That is, the present invention is an air flow classification having a classification chamber in which the powder material introduced from the powder supply cylinder together with the carrier air is swirled by the air flow flowing through the classification louver and centrifugally separated into fine powder and coarse powder. A machine part, an accelerating tube for accelerating the powder raw material by high-pressure gas, and a crushing chamber having a collision surface for crushing the powder ejected from the accelerating tube with a collision force, and In a collision-type airflow crushing device having a collision-type airflow crusher unit in which a collision member is provided facing the accelerating pipe outlet, the airflow classifier unit is an inclined classifying plate provided at the bottom of the classification chamber. Has a structure for discharging fine powder from the fine powder discharge chute connected to the discharge port provided in the central part of the classifying plate, and discharging the coarse powder from the coarse powder discharging port formed on the outer peripheral portion of the classifying plate, and An annular guide chamber communicating with the powder supply cylinder A plurality of louvers having a tip directed in a tangential direction of an inner circumferential direction of the guide chamber is provided between the guide chamber and the classifying chamber, and the collision type airflow crusher unit has a Laval shape. Between the throat portion of the accelerating tube and the accelerating tube outlet, the powder raw material supply port extending in the entire circumferential direction of the accelerating tube, or a plurality (n ≧ 2)
Is provided with a powder raw material supply port having a hole, and the cross-sectional shape of the crushing chamber is a scroll shape, and further, a crushed material discharge port is provided behind the collision member,
Further, the coarse powder discharge port of the airflow classifier section is communicated with the powder raw material supply chute of the collision type airflow crusher section, and the pulverized material discharge port of the collision type airflow crusher section is the powder of the airflow classifier section. The collision type airflow crushing device is characterized by being communicated with a body supply cylinder.

[0008]

The collision type airflow crushing apparatus of the present invention comprises an airflow classifier section and a collision type airflow crusher section, both parts having a specific structure, and a coarse classifier which is accurately centrifuged in the airflow classifier section. The powder discharge port communicates with the powder raw material supply port of the collision-type airflow crusher section with excellent crushing efficiency, and the crushed material discharge port of the collision-type airflow crusher section is the powder supply tube of the airflow classifier section. The powder material can be pulverized very efficiently and highly accurately as compared with the conventional collision type air flow pulverizing device. That is, as a result of intensive studies to solve the problems of the conventional airflow classifier, the present inventors have provided an annular guide chamber communicating with the powder supply cylinder on the upper part of the classification chamber, and the guide chamber and the classification chamber. It was found that the dispersibility of the powder material can be improved and further highly accurate classification can be performed by providing a plurality of louvers with the tip directed in the tangential direction of the inner circumferential direction of the guide chamber between the chamber and the chamber. .. In addition, as a result of intensive studies to solve the problems of the conventional collision type air flow crusher, the present inventors have found that the entire circle of the acceleration pipe is between the throat portion and the outlet of the acceleration pipe having a Laval shape. A powder raw material supply port extending in the circumferential direction or a plurality of (n ≧ 2) powder raw material supply ports are provided, and the cross-sectional shape of the crushing chamber is a scroll shape. More preferably, the central axis of the acceleration tube is in the vertical direction. The powder material can be uniformly dispersed in the high-pressure air stream so as not to cause uneven concentration, and can evenly collide with the collision surface of the collision member facing the acceleration tube. Therefore, it was found that the powder material can be efficiently crushed by the impact force at the time of collision.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of the collision type airflow crushing device of the present invention, and FIG.
1. It is sectional drawing in the AA 'line of FIG. 1, FIG. 3 is sectional drawing in the DD' line of FIG. 1, Similarly, FIG. 4 is sectional drawing in the BB 'line of FIG. FIG. 5 is CC of FIG.
It is a cross-sectional view taken along the line '.

The collision type airflow crushing apparatus of the present invention is characterized by comprising an airflow classifier section having a specific structure described below and a collision type airflow crusher section. First, the collision-type airflow crusher unit of the collision-type airflow crusher of the present invention will be described with reference to FIG. As shown in FIG. 1, the collision type airflow pulverizer section of the device of the present invention includes a raw material supply chute 21 and a high-pressure gas storage tank 2.
2, an acceleration tube 23, a collision member 24, a crushing chamber 25, a secondary collision plate 26, and a raw material supply port 30. Explaining the action of the high pressure gas in the collision type air flow pulverizer section, the high pressure gas first enters from the inlets 28 on the left and right sides of the high pressure gas storage tank 22, and after the pulsation such as pressure fluctuation is made uniform, the throat of the accelerating pipe. It flows into the accelerating pipe 23 from the portion 31 (shown in FIG. 4). Since the accelerating tube 23 has a Laval shape that widens toward the end,
The high-pressure gas flowing into the accelerating tube 23 is accelerated to the supersonic region while expanding. In the process, the high pressure gas is decompressed, and the pressure of the gas at the exit of the accelerating pipe 23 is the crushing chamber 25.
Is almost the same as the pressure. On the other hand, in the scroll-shaped crushing chamber 25, when the gas in the crushing chamber 25 is sucked at the outlet portion 27, as is clear from the cross-sectional view taken along the line DD ′ of FIG. Airflow vortices are generated inside.
Then, due to the action of this air flow vortex, the surface of the collision member 24 is in a reduced pressure state. Then, due to the depressurizing action of the surface of the collision member 24, the jet flow emitted from the acceleration pipe 23 is further accelerated and collides with the surface of the collision member 24. At this time, since the collision surface of the collision member 24 has a cone shape with an apex angle in the range of 110 to 175 degrees, the jet flow that collides with the collision member 24 is centered on the apex of this conical member. Collision member 24
And the secondary collision plate 26 are radially diffused. The diffused airflow is guided to the outlet 27 of the crushing chamber 25 and introduced into the airflow classifier while riding on the airflow vortex inside the crushing chamber 25 described above.

Next, the operation of the supplied powder raw material in the collision type airflow pulverizer section will be described. The powder raw material that is the object to be crushed is supplied from above the raw material supply chute 21. Then, the supplied powder raw material is sucked and discharged from the lower portion of the raw material supply chute 21 through the raw material supply port 30 to the acceleration pipe 23. The principle of suction and discharge of the raw material at this time is
This is due to the ejector effect due to the expansion and decompression of the high-pressure gas in the accelerating tube. At this time, in the collision-type airflow crusher unit of the collision-type airflow crusher device of the present invention, in order to sufficiently disperse the powder raw material and suck it into the acceleration tube 23, the acceleration tube 23 having a Laval shape is formed. Throat and accelerator tube 23
5, the powder raw material supply port 30 extending in the entire circumferential direction of the acceleration tube 23 as shown in FIG. 5, or a plurality of (n ≧ 2) holes as shown in FIG. Powder material supply port 3 having
0 is provided (n = 4 in FIG. 6), and the acceleration tube 23
Since the central axis of is in the vertical direction, the powder raw material is sufficiently dispersed by the high-pressure air flow and acceleration is accelerated. On the other hand, FIG.
In the conventional collision type airflow crusher as shown in FIG. 8, the raw material supply port 35 to the accelerating pipe 32 is connected to the middle of the accelerating pipe 32 and is provided at only one place. Immediately after passing through the raw material supply port 35, the powder raw material sucked and introduced is rapidly changed in flow path toward the accelerating pipe outlet 33 by the high-pressure airflow ejected from the high-pressure gas supply nozzle 40. However, since it is dispersed in the high-pressure air stream and is rapidly accelerated, it is separated into a flow having a high concentration of the powder raw material and a flow having a low concentration of the powder raw material, and is not sufficiently dispersed and accelerated. As described above, the powder raw material dispersed and sucked in the acceleration tube 23 of the collision type airflow crusher section of the apparatus of the present invention is sufficiently dispersed by the high-speed airflow emitted from the acceleration tube throat section 31.

Next, the powder raw material dispersed as described above is accelerated by riding on the high-speed air current flowing inside the accelerating tube 23, and becomes a supersonic solid-gas mixture flow. After this solid-gas mixture flow exits the accelerating tube 23, it becomes a solid-gas mixture jet flow, which collides with the collision member 24 under the same action as the aforementioned jet flow. The raw material coarse powder is finely pulverized by this collision. The crushed product is divided into fine powder and coarse powder that has not been crushed yet. The fine powder is guided to the crushing chamber outlet 27 by riding on the above-mentioned radially diffused airflow and riding on the vortex in the crushing chamber 25. On the other hand, the coarse powder that has not yet been crushed has a large effect on the mass of the reaction at the time of collision, cannot fully ride the radially diffused airflow, and jumps out of the diffused airflow to cause a secondary collision. Due to this secondary collision, the coarse powder which has not been crushed yet becomes fine powder, enters the crushing chamber 25 along with the solid-gas mixed diffusion air flow containing the finely crushed powder, and the vortex vortex described above causes the crushing chamber exit. Guided to 27. According to the collision type airflow pulverizer section of the device of the present invention, the powder raw material can be uniformly dispersed in the high-pressure airflow so as not to cause concentration unevenness, and the collision surface of the collision member 24 facing the acceleration tube. Since the particles can be uniformly collided with each other, the powder raw material is efficiently crushed by the impact force at the time of the collision. In the collision type airflow crusher section of the device of the present invention,
It is more preferable to provide the secondary collision plate 26 facing the collision surface of the collision member 24. As a result, the secondary (or tertiary) collision can be efficiently performed, and the grinding efficiency is further improved. Further, in the collision type airflow crusher section of the device of the present invention, since the shape of the crushing chamber has a scroll shape, the powder raw material generated from the outlet of the acceleration tube 23 to the outlet of the crushing chamber 25 It is possible to minimize the pressure loss of the solid-gas mixture flow composed of the high-pressure air flow. For this reason, the expansion speed of the high-pressure airflow inside the acceleration tube 23 increases, so that the speed of the powder raw material particles in the high-pressure airflow also increases, and a larger impact force is applied to the powder raw material. Further, the apex angle of the tip of the collision surface of the collision member 4 of the collision type airflow crusher section of the device of the present invention is 11
Since it is a cone shape in the range of 0 to 175 degrees, for example,
Even when the raw material is a powder containing a resin or an adhesive material, problems such as fusion, agglomerates and coarse particles do not occur. Further, since the collision type air flow pulverizer section of the device of the present invention can uniformly disperse the powder raw material in the high-speed air flow, even in the case of pulverizing the powder raw material containing the abradable substance, It is possible to prevent the local wear of the inner wall and the collision surface of the collision member 4 from occurring, and more stable operation becomes possible.

Next, the air flow classifier section which is another component of the apparatus of the present invention will be described with reference to FIG. In FIG. 1, 1 is a cylindrical main body casing, 2 is a lower casing, and a hopper 3 for discharging coarse powder is connected to the lower portion of 2. A classification chamber 4 is provided inside the main body casing 1. The upper portion of the classification chamber 4 is closed by an annular guide chamber 5 attached to the upper portion of the main body casing 1 and a conical (umbrella) upper cover 6 having a raised central portion. A plurality of louvers 7 arranged in the circumferential direction are provided on a partition wall between the classification chamber 4 and the guide chamber 5 (see FIG. 2).
Is provided) so that the powder material and the air sent from the supply tower 8 are swirled into the classification chamber 4 from between the louvers 7 into the guide chamber 5. It should be noted that it is necessary to evenly distribute the air flowing in the guide chamber 5 and the powder material among the louvers 7 in order to perform accurate classification. Further, the flow path to reach the louver 7 needs to be shaped so that concentration due to centrifugal force does not easily occur. In the example of FIG. 1, the supply cylinder 8 is connected in the upward direction perpendicular to the horizontal plane of the classification chamber 4, but the present invention is not limited to this. In this way, in the air flow classifier unit used in the device of the present invention, since air and powder material are supplied to the classification chamber 4 via the louver 7, air and powder are supplied to the classification chamber 4 at the same time. Significant dispersion improvements are achieved with the material over conventional methods. The louver spacing can be adjusted arbitrarily.

Further, in the airflow classifier used in the apparatus of the present invention, a classification louver 9 arranged in the circumferential direction is also provided in the lower part of the main body casing 1, and classification air for generating a swirling flow from the outside to the classification chamber 4 is provided. It is introduced through the classification louver 9. At the bottom of the classifying chamber 4, a conical (umbrella) classifying plate 10 having a raised central portion is provided, and a coarse powder discharge port 11 is formed on the outer periphery of the classifying plate 10. Further, a fine powder discharge chute 12 connected to a fine powder discharge port is provided at the center of the classifying plate 10.
Bending the lower end of the fine powder discharge chute 12 into an L-shape,
The bent end is positioned outside the side wall of the lower casing 2. Further, the fine powder discharging chute 12 is connected to a suction fan (not shown) through a fine powder collecting means such as a cyclone or a dust collector, and a suction force is applied to the classification chamber 4 by the suction fan to cause the louver 9 to move. The swirling flow required for classification is caused by the suction air flowing into the classification chamber 4 from the interval. Since the air flow classifier section used in the device of the present invention has the structure as described above, the powder material supply cylinder 8
When it is supplied together with air from the guide cylinder 5 to the guide cylinder 5, the air containing the powder material passes from the guide chamber 5 to each louver 7 and swirls into the classification chamber 4 to be dispersed at a uniform concentration. Be flowed in. The powder material flown into the classifying chamber 4 while swirling is then generated by a suction fan connected to the fine powder discharging chute 12 and sucking air flow that flows in between the classifying louvers 9 at the lower part of the classifying chamber 4. The particles are further swirled, and the centrifugal force acting on each particle efficiently separates into coarse powder and fine powder. At this time, the coarse powder swirling around the outer peripheral portion of the classification chamber 4 is discharged from the coarse powder discharge port 11 and then discharged from the lower hopper 3. Also, the classification plate 10
The fine powder that moves to the center along the upper inclined surface of is discharged from the fine powder discharge chute 12 to the fine powder collecting means (not shown). In the airflow classifier section used in the device of the present invention,
Since all the air flowing into the classification chamber 4 together with the powder material flows as a swirl flow, the velocity of the particles swirling in the classification chamber 4 toward the center becomes relatively smaller than the centrifugal force.
Classification with a small particle size is performed in the classifying chamber 4, and fine powder with a very small particle size can be discharged to the fine powder discharge chute 12. Moreover, since the powder material flows into the classification chamber 4 at a substantially uniform concentration, a fine powder having a fine distribution can be obtained.

The collision type airflow crushing apparatus of the present invention is such that the collision type airflow crushing machine section and the airflow classifying machine section as described above are connected as shown in FIG. That is, the coarse powder discharge port 11 of the airflow classifier unit is connected to the powder raw material supply chute 1 of the collision type airflow crusher unit, and the crushed material discharge port 27 of the collision type airflow crusher unit is connected to the airflow classifier unit. By connecting to the powder supply cylinder 8, the pulverized material efficiently pulverized by the collision type air flow pulverizer section is introduced into the air stream classifier section, and only fine powder having a very small particle size and a fine distribution is obtained. The other coarse powders collected from the fine powder discharge chute 12 are re-introduced into the collision type airflow pulverizer section and re-pulverized, and repeatedly pulverized until a fine powder having a very small particle size and a fine distribution is obtained. I can continue. In the collision-type airflow crushing device of the present invention, the crushing raw material is introduced from the raw material introducing port 13 of FIG. 1 by an appropriate introducing means.

[0016]

As described above, in the collision type airflow crusher section of the collision type airflow crushing device of the present invention, the material to be fed to the accelerating tube is devised in comparison with the conventional one, so that the object to be crushed 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 becomes possible to improve the pulverization efficiency. Further, the collision type airflow crusher section of the collision type airflow crushing device of the present invention has a collision member and an accelerating pipe and a crushed chamber in the crushing chamber due to a reduction in the dust concentration due to the devise of the crushing chamber shape and the strong dispersion of the crushed object The fusion and wear of the are also significantly reduced compared to the conventional collision type airflow crusher, and stable operation can be achieved. Further, in the airflow classifier section of the collision type airflow crushing apparatus of the present invention, classification with a small separation particle size is performed in the classification chamber, and it is possible to obtain a fine powder having a very small particle size and a fine distribution. Therefore, the collision type airflow pulverizing apparatus of the present invention can efficiently pulverize the powder raw material, and can also accurately collect the pulverized fine powder.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

3 is a cross-sectional view taken along the line DD ′ of FIG.

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

5 is a cross-sectional view taken along the line CC 'in FIG. 1, showing an example in which the raw material supply port extends in the entire circumferential direction of the acceleration tube.

FIG. 6 is a cross-sectional view taken along the line CC ′ in FIG. 1, showing an example in which the raw material supply port has n = 4 holes.

FIG. 7 is a schematic view showing a conventional collision type airflow crusher.

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

FIG. 9 is a schematic view showing a conventional airflow classifier.

[Explanation of symbols]

 1, 101: Main body casing of classifier 2, 70: Lower casing of classifier 3, 130: Coarse powder discharge hopper 4, 150: Classifying chamber 5: Guide chamber 6, 60: Upper cover 7, 9, 90: Louver 8, 80 : Supply cylinder 10, 100: Classifying plate 11, 110: Coarse powder discharge port 12, 120: Fine powder discharge chute 13: Raw material introduction part 21: Powder raw material supply chute 22: High pressure gas storage tank 23: Accelerator tube 24: Collision member 25 : Grinding chamber 26: Secondary collision plate 27: Grinding chamber outlet 28: High pressure gas inlet 29: High pressure gas communication passage 30: Raw material supply port 31: Accelerator throat 50: Guide cylinder

Claims (3)

[Claims] 1. An airflow classifier having a classification chamber in which a powder material introduced from a powder supply cylinder together with carrier air is swirlingly flowed by an airflow flowing through a classification louver and centrifugally separated into fine powder and coarse powder. Section, an accelerating tube for accelerating the powder raw material by high-pressure gas, and a crushing chamber having a collision surface for crushing the powder ejected from the accelerating tube with a collision force, and the collision In a collision-type airflow crushing device having a collision-type airflow crusher unit in which a member is provided facing the accelerating pipe outlet, the airflow classifier unit includes an inclined classifying plate provided at the bottom of the classification chamber. It has a structure that discharges fine powder from a fine powder discharge chute connected to the discharge port provided in the central part and discharges coarse powder from the coarse powder discharge port formed on the outer periphery of the classification plate, and the upper part of the classification chamber. Provided with an annular guide chamber communicating with the powder supply cylinder , A plurality of louvers having a tip directed in a tangential direction of an inner circumferential direction of the guide chamber is provided between the guide chamber and the classification chamber, and the collision type airflow crusher unit has a Laval shape. Between the throat portion of the accelerating pipe and the accelerating pipe outlet, a powder raw material supply port extending over the entire circumferential direction of the accelerating pipe or a powder raw material supply port having a plurality of (n ≧ 2) holes is provided. The cross-sectional shape of the crushing chamber is a scroll shape, and further, a crushed material discharge port is provided behind the collision member, and the coarse powder discharge port of the airflow classifier section collides with the collision. Collision type characterized in that it is connected to the powder raw material supply chute of the air flow crusher section, and further the pulverized material discharge port of the collision type air flow crusher section is connected to the powder supply cylinder of the air flow classifier section. Airflow crushing device. 2. The collision type airflow crushing apparatus according to claim 1, wherein the central axis of the accelerating tube is vertical. 3. The shape of the tip portion of the collision surface of the collision member is
The collision type airflow crushing device according to claim 1, which is a cone shape having an apex angle in the range of 110 to 175 degrees.