JP2008114190A - Grinding device and grinding method - Google Patents

Abstract

A pulverizing apparatus and a pulverizing method capable of efficiently pulverizing and efficiently producing a powder having a desired particle diameter are provided.
A compression chamber having a crushing chamber having a substantially cylindrical casing, a plurality of crushing nozzles, and a rotor provided at an upper portion of the crushing chamber, and being injected from the crushing nozzles. In the pulverizer 13 for pulverizing the powder in the pulverization chamber 4 with air, allowing the pulverized powder to flow into the rotating rotor 3 from the pulverization chamber 4 and centrifugally classifying the powder into fine powder and coarse powder to obtain fine powder. The pulverizing apparatus 13 is a pulverizing apparatus 13 in which a guide cone 10 for concentrating an object to be pulverized is provided above the pulverizing nozzle 5.
[Selection] Figure 2

Description

  The present invention relates to a pulverizing apparatus for pulverizing and classifying a powder material, particularly a powder material used for producing an electrophotographic toner, to produce a fine powder.

Conventionally, a pulverization apparatus for producing fine powders such as toner for electrophotography having a desired particle size of micron order includes a plurality of pulverization nozzles, a pulverization chamber, and pulverization inside a cylindrical side wall. A fluidized bed type in which a rotating classifying rotor (also called a rotary classifier) provided above the chamber is disposed is generally used.
In the case of the above-described electrophotographic toner, a toner powder material (hereinafter sometimes referred to as a toner raw material) prepared by melt-kneading a toner constituent material such as a resin and a colorant and roughly pulverizing the kneaded material. Then, it is pulverized by a pulverizer to obtain a fine powder.
As the pulverization classification of the powder material performed using the fluidized bed type pulverizer, first, the pulverized material such as the toner powder material is supplied into the pulverization chamber, and then compressed air is supplied from a plurality of pulverization nozzles. Is jetted to form a jet stream in the grinding chamber. The powder material in the crushing chamber collides with each other while being accelerated and carried by this jet stream, and is crushed.
Next, the powder subjected to the pulverization action as described above is guided into the classification rotor by the rising air flow generated in the pulverization chamber, and the powder is pulverized to a desired particle size or less by the rotational force of the classification rotor. The powder is classified into a powder (hereinafter referred to as fine powder) and a powder that has not been crushed to a desired particle size (hereinafter referred to as coarse powder).
And about fine powder, it passes the inside of a classification rotor, is discharged | emitted outside a grinding apparatus, and is collect | recovered as a product. On the other hand, the coarse powder is pushed out of the classifying rotor by centrifugal force generated with the rotation of the classifying rotor, returned to the pulverizing chamber along the side wall, and again subjected to the pulverizing action.

FIG. 1 is a schematic cross-sectional view showing an example of a conventional fluidized bed pulverizer. In FIG. 1, a pulverization apparatus 13 includes a pulverization chamber 4 having a substantially cylindrical casing, a supply pipe 1 that supplies a powder material into the pulverization chamber 4, and a plurality of air that compresses and injects air into the pulverization chamber 4. It is mainly composed of a pulverizing nozzle 5, a classification rotor 3 for classifying the pulverized powder material, and an exhaust pipe 2 for discharging the powder classified into a desired particle size by the classification rotor 3 together with air after pulverization. .
Below, operation | movement of the grinding | pulverization apparatus of such a structure is demonstrated. In FIG. 1, first, a certain amount of powder is filled into the grinding chamber 4 from the supply pipe 1. Next, compressed air is jetted from a plurality of pulverizing nozzles 5 arranged facing each other, and the compressed air collides in the region where the exit extension lines of each of the opposing pulverizing nozzles 3 intersect, that is, near the central axis of the pulverizing chamber 4. Let
At this time, the powder material that accelerates and moves in the compressed air stream collides with the compressed air in the vicinity of the central axis of the crushing chamber 4 and receives a crushing action. On the other hand, a suction device (not shown) such as a suction fan communicating with the exhaust pipe 2 sucks the powder subjected to the pulverizing action and guides the powder into the rotor 3. At this time, the rotor 3 installed in the upper part of the crushing chamber 4 is classified into fine powder pulverized to a desired particle size and other coarse powder by rotation thereof.
Of these, the fine powder is discharged to the outside of the pulverizer through the exhaust pipe 2 and collected as a product. On the other hand, the powder material (coarse powder) larger than the desired particle size is guided to the outside of the rotor 3 by the centrifugal force of the rotor 3 and guided downward along the wall surface of the grinding chamber 4 to be subjected to the grinding action again. .
Thus, when the fine powder pulverized to a desired particle size or less is discharged from the exhaust pipe 2 and recovered as a product, the amount of the powder material inside the pulverization chamber 4 is reduced. For this reason, the powder material is newly supplied from the supply pipe 2, and the continuous pulverization is performed by setting the amount of the powder material in the pulverization chamber 4 to be always constant.

As described above, as a conventional technique for pulverizing a powder material to a desired particle size, for example, Patent Document 1 discloses an upper surface of a powder material deposited on a bottom plate provided in a pulverization chamber in a fluidized bed type pulverizer. Has been proposed to install a bottom plate position adjusting device that moves the bottom plate up and down so that the airflow is always held at the position where the airflow is ejected from the crushing nozzle.
However, according to the fluidized bed type pulverization apparatus disclosed in Patent Document 1, although the upper surface of the powder material deposited on the bottom plate can be held at the airflow ejection position of the nozzle, the holding method is deposited on the apparatus bottom plate. By measuring the weight of the powder material and maintaining it at a constant weight, the upper surface of the deposited powder material is held, and a slight improvement in the grinding efficiency can be expected.

  Further, in Patent Document 2, a collision member is installed on the central axis of the crushing chamber so that the center is located, and a high-speed gas is jetted perpendicularly together with the powder material onto the collision member, whereby the powder material A technique has been proposed in which the powder material is pulverized by colliding with a collision member to obtain a pulverized product having a desired particle diameter.

However, in the techniques described in Patent Document 1 and Patent Document 2, when powder is introduced into the pulverization chamber, a part of the powder diffuses into a region other than the gas outlet of the pulverization nozzle, and these diffused powders. Therefore, the pulverization action by the compressed air injected from the pulverization nozzle cannot be sufficiently received. For this reason, even if it grinds repeatedly as mentioned above, since a fixed quantity of coarse powder which has a particle size more than a desired particle diameter remains, there exists a problem that a grinding | pulverization efficiency does not improve.
Furthermore, in recent years, with the improvement in the image quality of images formed by the electrophotographic system, there has been an increasing demand for reducing the particle size of electrophotographic toner and producing a large variety of small quantities. For this reason, it is desired to increase the speed and efficiency of toner production, and for the fluidized bed type pulverization apparatus, when switching the pulverization classification work corresponding to powders of different varieties, than the conventional pulverization apparatus, The thing which can shorten the switching time easily is desired.

JP-A-11-226443 JP 2000-5621 A

  The present invention has been made in view of such problems, and the problem is that a pulverization apparatus and a pulverization method that can efficiently pulverize and efficiently produce a powder having a desired particle size. Is to provide.

In order to solve the above problems, a pulverization apparatus according to the present invention is provided in a pulverization chamber composed of a substantially cylindrical casing, a plurality of pulverization nozzles for injecting compressed air into the pulverization chamber, and an upper portion of the pulverization chamber. A rotor having a rotor, wherein the powder is pulverized by compressed air injected from a plurality of pulverization nozzles in a pulverization chamber to which the powder is supplied, and the pulverized powder is rotated from the pulverization chamber. In the pulverizing apparatus for obtaining a fine powder by being classified into fine powder and coarse powder by flowing into the pulverizer, the pulverizing apparatus is characterized in that a guide cone for concentrating the object to be crushed is provided above the pulverizing nozzle.
In this case, the crushing device may be configured such that the guide cone is provided above each of the plurality of crushing nozzles.
Moreover, it is preferable that the said guide cone shall be provided in the said powder apparatus main body so that attachment or detachment is possible.
In the pulverization apparatus, it is preferable that a supply pipe for supplying powder into the pulverization chamber is provided above each of the plurality of pulverization nozzles and the guide cones.
Still further, the powder device may control the amount of powder supplied from the supply pipes into the powder device to the same amount.
The guide cone is preferably subjected to wear resistance treatment.
Further, after the compressed air injected from the plurality of pulverizing nozzles collides with powder, a collision means for colliding the compressed air and powder may be provided.
In addition, a nozzle guide adapter that regulates the jet direction of the compressed air ejected from the pulverizing nozzle may be attached to the tip of the pulverizing nozzle.

Further, the pulverization method of the present invention comprises a pulverization chamber composed of a substantially cylindrical casing, a plurality of pulverization nozzles for injecting compressed air into the pulverization chamber, and a rotor provided at the upper portion of the pulverization chamber. The pulverizing apparatus is used to pulverize the powder with compressed air sprayed from a plurality of pulverizing nozzles in the pulverizing chamber supplied with the powder, and the pulverized powder is rotated into the rotor rotating from the pulverizing chamber. In the pulverization method of obtaining fine powder by centrifugally classifying into fine powder and coarse powder by inflow, the material to be crushed is concentrated in the vicinity of the jet nozzle of the pulverization nozzle by a guide cone provided on the upper part of the pulverization nozzle. .
In this case, it is preferable to use a crushing device in which the guide cone is provided above each of the plurality of crushing nozzles.
Moreover, the grinding | pulverization apparatus which provided the said guide cone in the said grinding | pulverization apparatus main body so that attachment or detachment was possible can be used.
In addition, using a pulverizer provided with a supply pipe above each of the plurality of pulverization nozzles and the guide cone, powder can be supplied from the supply pipe into the pulverization chamber.
Further, the amount of powder supplied from each of the supply pipes into the pulverization chamber can be controlled to the same amount.
In addition, it is preferable to use a pulverizer equipped with a wear-resistant treatment as the guide cone.
Further, it is preferable to use a pulverizing apparatus provided with a collision means for causing the compressed air and the powder to collide after the compressed air injected from the plurality of pulverizing nozzles collides with the powder.
Moreover, it is preferable to use a pulverizing apparatus in which a nozzle guide adapter for restricting the jet direction of compressed air ejected from the pulverizing nozzle is attached to the tip of the pulverizing nozzle.

  According to the pulverization apparatus and the pulverization method of the present invention, the object to be crushed can be efficiently placed in the compressed air stream, the probability of collision of the powder in the pulverization chamber can be increased, and highly efficient pulverization can be performed. it can.

Below, the grinding | pulverization apparatus of this invention and the grinding | pulverization method using the same are demonstrated in detail.
FIG. 2 is a longitudinal sectional view showing a schematic configuration of the crushing apparatus according to the first embodiment of the present invention. The pulverizer 13 shown in FIG. 2 is a fluidized bed pulverizer. In FIG. 2, a rotatable rotor 3 is provided on an upper portion of a crushing chamber 4 formed of a substantially cylindrical casing. The side walls of the crushing chamber 4 are provided with crushing nozzles 5a to 5d for injecting compressed air into the crushing chamber 4, and guides for concentrating the material to be crushed above each of the crushing nozzles 5a to 5d. Cones 10a to 10d are provided. Further, supply pipes 1 a to 1 d for supplying powder into the crushing chamber 4 are provided above the guide cones 10 a to 10 d.

The crushing chamber 4 is constituted by a cylindrical casing. The inner diameter of the crushing chamber 4 is preferably 100 to 1000 mm, more preferably 300 to 900 mm, and still more preferably 500 to 800 mm. Moreover, 300-3000 mm is preferable, as for the height of the crushing chamber 4, 700-2700 mm is more preferable, and 1000-2500 mm is still more preferable.
By making the shape of the grinding chamber 4 cylindrical, the powder can be uniformly supplied into the grinding chamber 4 and the powder can be uniformly ground in the grinding chamber 4.

  FIG. 3 is a cross-sectional view of the grinding chamber in the present embodiment. In FIG. 3, the crushing nozzles 5 a to 5 d are provided concentrically around the central axis in the longitudinal direction of the crushing chamber 4 so that the respective ejection ports 51 a to 51 d face each other. By providing each jet outlet 51 so as to face each other, the compressed air ejected from each of the crushing nozzles 5 a to 5 d collides with the central axis of the crushing chamber 4 or a region in the vicinity thereof.

  The pressure of the compressed air ejected from the pulverizing nozzle 5 is preferably 0.3 to 1.0 MPa. Further, the pulverization nozzle 5 is preferably opposed so that the jet nozzle 51 thereof has an inclination within 20 ° in the vertical direction with respect to the horizontal direction, and more preferably with an inclination within 15 ° in the vertical direction. It is more preferable to face each other with an inclination within 10 ° in the vertical direction. When the exit direction of the pulverizing nozzle is opposed with an inclination exceeding 20 ° in the vertical direction, the pulverization efficiency is lowered.

  The surface of the guide cone 10 is subjected to wear resistance treatment. Thereby, since wear during continuous grinding is prevented, grinding loss for maintenance is reduced, and grinding efficiency is improved.

FIG. 7 is a view for explaining the area ratio of the upper and lower openings of the guide cone in the crusher of the present invention. In FIG. 7, the area of the opening 101 at the upper part of the guide cone 10 is formed with an area ratio several times larger than the area of the opening 102 at the lower part of the guide cone 10. On the other hand, the opening 101 at the top of the guide cone 10 is formed to occupy a certain ratio or more.
In the present invention, the area of the opening 101 at the upper part of the guide cone 10 is preferably four times or more the area of the opening 102 at the lower part of the guide cone 10, and the area of the opening 101 at the upper part of the guide cone 10. Is preferably 20 to 50% of the cross-sectional area of the inner diameter of the crushing chamber 4.
When the area of the upper opening 101 of the guide cone 10 is four times or less than the area of the lower opening 102, the shape of the cone is too thin and the powder introduced from the supply pipe 1 or the rotor Since the coarse powder classified and dropped from 3 does not enter the guide cone 10 and falls to the outside of the guide cone 10, the pulverizability is lowered.
Further, if the upper opening 101 is 20% or less with respect to the cross-sectional area of the crushing chamber 4, it is difficult to sufficiently collect the powder, and the crushing efficiency is lowered. On the other hand, if the upper opening 101 is 50% or more with respect to the cross-sectional area of the crushing chamber 4, the upward flow of the pulverized powder to the rotor 3 is hindered.

  In the present invention, the configuration of the pulverizing apparatus 4 is not limited to the configuration shown in FIG. 3, and for example, the configuration shown in FIG. FIG. 4 is a cross-sectional view of a crushing chamber according to another embodiment. As shown in FIGS. 3 and 4, the crushing nozzles 5 are provided on the concentric circles at equal intervals (equal angles). As a result, the compressed air ejected from the ejection port 51 and the powder riding on the compressed air stream collide with each other on the central axis in the longitudinal direction of the crushing chamber 4 or in the vicinity thereof and are crushed.

The number of crushing nozzles 5 provided in the crushing chamber 4 is preferably 2-8, more preferably 2-6, and even more preferably 3-4.
When the number of the crushing nozzles 5 provided in the crushing chamber 4 is one, the compressed air accompanied by the powder material cannot be primarily collided, and a sufficient crushing effect cannot be obtained. On the other hand, when the number of crushing nozzles 5 provided in the crushing chamber 4 is more than 8, the entire configuration of the crushing apparatus becomes complicated, the production process of the apparatus main body becomes complicated, and crushing efficiency may be lowered.

Hereinafter, the pulverization operation performed by the pulverizer having such a configuration will be described with reference to FIG.
FIG. 8 is a diagram for explaining the pulverization operation of the pulverizer of the present invention. After the powder introduced into the supply pipe 1 has entered the crushing chamber 4 (dotted line a in the figure), it flows into the guide cone 10 from the upper opening 101 of the guide cone 10, and the crushing nozzle from the lower opening 102. It flows out to the vicinity of the 5 jet nozzles 51. Here, the amount of powder supplied from each supply pipe 1 into the crushing chamber 4 is controlled to be the same amount. The powder that has flowed out in the vicinity of the jet nozzle 51 of the crushing nozzle 5 rides on a compressed air stream ejected from the crushing nozzle 5, collides with each other while being accelerated, and is crushed.
A suction fan (not shown) provided in communication with the exhaust pipe 2 sucks the powder subjected to the above-described pulverization action in the pulverization chamber 4 into the rotor 3. The rotor 3 centrifuges the powder that has entered the interior into fine powder that has been pulverized to less than a desired particle size and other coarse powder by its rotational force.
Further, the rotor 3 moves the coarse powder to the outside of the rotor 3 by the centrifugal force. The coarse powder that has moved to the outside of the rotor 3 moves downward along the wall surface and returns into the crushing chamber 4 (dotted line b in the figure). The coarse powder that has entered the crushing chamber 4 falls along the guide cone 10, flows out from the lower opening 102 to the vicinity of the ejection port 51 of the crushing nozzle 5, and is crushed again by compressed air ejected from the crushing nozzle 5. . On the other hand, the suction fan sucks the fine powder centrifuged by the rotor 3, sends it to the exhaust pipe 2, and discharges it to the outside of the grinding device 13.

According to this embodiment, since the guide cone 10 is provided above each of the crushing nozzles 5, the powder supplied from the supply pipe 1 and the coarse powder classified by the rotor 3 and falling along the guide cone 10 Then, it moves in the crushing chamber 4 and is collected in the vicinity of the jet nozzle 51 of the crushing nozzle 5. Therefore, the powder as the object to be crushed can be surely placed on the compressed air ejected from each jet port 51, the collision probability between the powders can be increased, and highly efficient pulverization can be performed.
In this embodiment, the guide cone 10 and the supply pipe 1 are provided above all the crushing nozzles 5. However, the crushing apparatus 4 of the present invention has the guide cone 10 provided above the crushing nozzles 5. As long as the configuration is not limited to the above, for example, there may be a portion where the guide cone 10 or the supply pipe 1 is not provided above the crushing nozzle 5.

Moreover, according to this embodiment, by providing the rotor 3 in the upper part of the crushing chamber 4, the powder pulverized in the crushing chamber 4 is directly flowed into the rotor 3, and these are made into fine powder and coarse powder. It is possible to quickly shift to the operation of centrifuging.
In addition, according to the present embodiment, by controlling the supply amount of the powder supplied from each supply pipe 1 into the powder chamber 4 so as to be the same amount, the compressed air ejected from each ejection port 51 can be controlled. The amount of the powder to be placed can be made uniform, the collision probability between the powders can be increased, and highly efficient grinding can be performed.

It is preferable that the guide cone 10 is detachably provided on the powder device 13 body.
As a result, guide cones can be selected appropriately according to conditions such as the average particle size of the powder to be crushed and the amount of powder processed, and can be easily mounted, reducing the time required for such switching. Efficient pulverization becomes possible while making it easier.

FIG. 5 is a longitudinal sectional view showing a schematic configuration of a crushing apparatus according to the second embodiment of the present invention. In FIG. 5, the crushing device 13 is provided with a collision plate 11 between the crushing nozzles 5 provided facing each other inside the crushing chamber 4.
In the pulverization apparatus according to the second embodiment shown in FIG. 5, compressed air injected from the jet ports 51 a to 51 d provided to face each other collides with powder (primary collision). As described above, the compressed air and powder that collide primarily in the region where the outlets of the respective pulverizing nozzles face each other collide with the collision plate 11.
In this way, since the pulverization effect due to the collision with the collision plate 11 can be received together with the pulverization effect due to the collision of the compressed air, a higher pulverization effect can be obtained.

FIG. 6 is a longitudinal sectional view showing a schematic configuration of a crusher according to a third embodiment of the present invention. In FIG. 6, a guide adapter 12 is provided at the tip portion of the pulverizing nozzle 5 to prevent the compressed air from diffusing by restricting the jet direction of the compressed air ejected from the ejection port 51 of the pulverizing nozzle 5. .
By attaching the nozzle guide adapter 12 to the ejection port 51 of each crushing nozzle 5, the ejection direction of the compressed air ejected from the ejection port 51 is restricted and the diffusion thereof is prevented. Powder can collide in a narrow area. Therefore, the collision probability between the powders can be further increased, and the pulverization efficiency can be improved.

  Examples of the powder material that can be pulverized by the pulverizing and classifying apparatus of the present invention include inorganic and organic industrial raw materials such as zeolite, silica, resin, and other raw materials used for producing a developer for developing an electrostatic image. Is mentioned.

  In addition, this invention is not limited to the said Example, If it is description in a claim, it can be set as the structure changed suitably.

Next, based on an Example, this invention is demonstrated still in detail.
In the following examples, a powder material obtained by melt-kneading a mixture of 85 parts by weight of a styrene-acrylic copolymer resin and 15 parts by weight of carbon black, cooling the kneaded material, and then roughly pulverizing with a hammer mill is used. The pulverization operation was performed using a pulverizer having the following configuration.

(Example 1)
The pulverization was performed using the pulverizer having the configuration shown in FIGS. The inside diameter of the grinding chamber 4 of this grinding device was 250 mm, the height of the grinding device 13 was about 400 mm, and the exit diameter of the grinding nozzle 5 was 5 mm. In addition, three crushing nozzles 5 are provided on the wall surface of the crushing chamber 4 at equal intervals (the same angle), and each crushing nozzle 5 receives compressed air discharged from the ejection port 51 almost in the crushing chamber 4. The jet outlet was provided in a horizontal state so as to collide on the central axis. The guide cone 10 was installed so that the lower end thereof was present at a position 15 mm above the center line of the crushing nozzle 5. As the guide cone 10, an ellipse having a lower portion of an ellipse having a diameter of 16 × 34 mm, an upper portion of an ellipse having a diameter of 83 × 120, and a pipe height from the lower end to the upper end of 70 mm was used.
The powder material having the above composition was supplied using a single supply pipe 1. The original pressure of the compressed air supplied to the pulverizing nozzle 5 was set to 0.6 MPa, the rotational peripheral speed of the rotor 3 was set to 45 m / s, and the powder material was pulverized. The fine powder obtained had a volume average particle size of 5.0 μm, a fine powder content (number%) of 4 μm or less (number%) of 50%, a coarse powder content (weight%) of 12 μm or more of 1.0%, and the pulverization amount was It was 14.5 Kg / hr. The volume average particle diameter of the fine powder was measured using a Coulter Counter TA-II (manufactured by Coulter).

(Example 2)
The powder material was supplied using the three supply pipes 1, and each of the supply amounts was the same as that of Example 1 except that the supply amount was the same using a supply screw feeder. The obtained fine powder has a volume average particle size of 5.0 μm, a fine powder content (number%) of 52 μm or less, 52%, a coarse powder content (weight%) of 1.1 μm or more, 1.1%, and the pulverization amount is It was 15.3 Kg / hr. The volume average particle diameter of the fine powder was measured using a Coulter Counter TA-II (manufactured by Coulter).

(Example 3)
The powder material was pulverized in the same manner as in Example 1 except that the guide cone 10 was removable, and then the cleaning was switched. As a result, the cleaning switching time can be reduced by about 10% compared to the first embodiment.

Example 4
The powder material was pulverized in the same manner as in Example 1 except that the guide cone 10 (space blocking member) that was lined with titanium was installed. As a result, the wear durability was improved approximately twice as compared with the prior art.

(Comparative Example 1)
The pulverization apparatus shown in FIG. 1 was used to set the original pressure of compressed air to 0.6 MPa and the rotational peripheral speed of the rotor 3 to 45 m / s. The fine powder obtained has a volume average particle size of 5.0 μm, a fine powder content (number%) of 52 μm or less, 52%, a coarse powder content (weight%) of 12 μm or more, 1.2%, and the pulverization amount is It was 13.2 Kg / hr. The volume average particle diameter of the fine powder was measured using a Coulter Counter TA-II (manufactured by Coulter).

It is a schematic sectional drawing which shows an example of the conventional fluidized bed type crusher. It is a longitudinal cross-sectional view which shows schematic structure of the grinding | pulverization apparatus which concerns on this invention. It is sectional drawing of the crushing chamber in this embodiment. It is sectional drawing of the crushing chamber in other embodiment. It is the schematic which shows the structure of the grinding | pulverization apparatus which concerns on 2nd Embodiment of this invention. It is the schematic which shows the structure of the grinding | pulverization apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the area ratio of the opening part of the upper part of the guide cone in the grinding | pulverization apparatus of this invention, and a lower part. It is a figure for demonstrating the grinding | pulverization operation | movement in the grinding | pulverization apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

1a to 1d Supply pipe 2 Exhaust pipe 3 Rotor 4 Crushing chambers 5a to 5d Crushing nozzle 51 Spout

10 Guide cone 101 Upper opening 102 Lower opening

Claims (16)

A crushing chamber comprising a substantially cylindrical casing;
A plurality of crushing nozzles for injecting compressed air into the crushing chamber, and a rotor provided at the top of the crushing chamber,
In the pulverization chamber supplied with the powder, the powder is pulverized by compressed air injected from a plurality of pulverization nozzles, and the pulverized powder flows into the rotating rotor from the pulverization chamber to make fine powder and coarse powder. In a pulverizing apparatus that obtains fine powder by centrifugal classification,
The pulverizing apparatus is characterized in that a guide cone for concentrating an object to be crushed is provided above the pulverizing nozzle. The pulverization apparatus according to claim 1, wherein the pulverization apparatus includes the guide cone provided above each of the plurality of pulverization nozzles. The pulverizer according to claim 1 or 2, wherein the guide cone is detachably provided on the powder device main body. The pulverization apparatus according to claim 2 or 3, wherein the pulverization apparatus includes a supply pipe for supplying powder into the pulverization chamber above each of the plurality of pulverization nozzles and the guide cones. The pulverizer according to claim 4, wherein the pulverizer controls the amount of powder supplied from the supply pipes into the powder device to the same amount. The grinding device according to any one of claims 1 to 5, wherein the guide cone is subjected to wear resistance treatment. The compressed air injected from the plurality of pulverizing nozzles collides with powder, and then a collision means for collision of the compressed air and powder is provided. The crushing apparatus as described in. The pulverization apparatus according to any one of claims 1 to 5, wherein a nozzle guide adapter that regulates an ejection direction of compressed air ejected from the pulverization nozzle is attached to a tip of the pulverization nozzle. Using a pulverization apparatus having a pulverization chamber composed of a substantially cylindrical casing, a plurality of pulverization nozzles for injecting compressed air into the pulverization chamber, and a rotor provided on the upper portion of the pulverization chamber, In the supplied pulverization chamber, the powder is pulverized by compressed air injected from a plurality of pulverization nozzles,
In the pulverization method for obtaining fine powder by flowing the pulverized powder into the rotor rotating from the pulverization chamber and centrifugally classifying it into fine powder and coarse powder,
A pulverization method comprising: concentrating an object to be pulverized in the vicinity of an ejection port of the pulverization nozzle by a guide cone provided on the pulverization nozzle. The pulverization method according to claim 9, wherein a pulverization apparatus in which the guide cone is provided above each of the plurality of pulverization nozzles is used. The pulverization method according to claim 9 or 10, wherein a pulverization device in which the guide cone is detachably provided on the pulverization device main body is used. The pulverization according to claim 10 or 11, wherein a pulverization apparatus provided with a supply pipe above each of the plurality of pulverization nozzles and the guide cone is used to supply powder into the pulverization chamber from the supply pipe. Method. The pulverization method according to claim 12, wherein the amount of powder supplied from each of the supply pipes into the pulverization chamber is controlled to be the same amount. The pulverization method according to any one of claims 9 to 13, wherein a pulverization apparatus having a wear-resistant treatment is used as the guide cone. 14. A pulverizer provided with a collision means for colliding compressed air and powder after the compressed air injected from the plurality of pulverizing nozzles collides with the powder is used. The grinding method according to any one of the above. 14. The pulverization apparatus in which a nozzle guide adapter that regulates a jet direction of compressed air ejected from the pulverization nozzle is attached to a nozzle tip of the pulverization nozzle is used. 15. Grinding method.

Images