JPH09206621A - Collision type air crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance crushing treatment capacity, in a crusher constituted so that an acceleration pipe having a supply port of matter to be crushed is connected to a compressed air supply nozzle to allow the accelerated matter to be crushed to collide with a barrier member to crush the same, by forming the expanded shape of the inner peripheral surface part of the acceleration pipe so as to satisfy a specific formula. SOLUTION: A collision type air crusher is equipped with a compressed air supply nozzle 2, an acceleration pipe 3 having a supply port 3 of matter to be crushed and a barrier member for crushing the matter to be crushed by the collision with the barrier member. In this case, when the effective distance along the common center line C of the compressed air supply nozzle 2 and the acceleration pipe 3 from a nozzle throat part 2a to the effective outlet part 3b of the acceleration pipe 3 is set to L, L/2=L1 , the expanse angle of the acceleration pipe 3 is set to θ and the expanse angle of the inner peripheral surface part of the acceleration pipe 3 at the position of the distance L1 from the nozzle throat part 2a is set to θ1 , the acceleration pipeline of the acceleration pipe 3 is formed into an expanded shape satisfying a relational expression represented by Ltan (θ/2)>=L1 tan (θ/2)>(1/2) Ltan (θ/2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision type airflow pulverizer equipped with a pressure reducing portion supply type pulverization nozzle using a jet jet, and more specifically to a toner or a colored resin for toner used for image formation by electrophotography. The present invention relates to a collision type airflow crusher suitable for producing powder.

[0002]

2. Description of the Related Art A collision-type airflow crusher using a jet jet supplies an object to be crushed into a jet jet, collides the object with a collision member, and crushes it by its impact force. A general configuration of such a collision type airflow crusher will be described with reference to FIG. FIG. 12 is a flow sheet of a crushing / classifying process in which a collision type airflow crusher and a classifier are combined, and the collision type airflow crusher is shown in a schematic vertical sectional view.

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

Usually, in order to crush the object 6 to be crushed to a desired particle size, a classifier 13 is provided between the discharge port 5 of the crushing chamber 7 and the object supply port 1 to form a closed circuit. To do. In this case, after the classification by the classifier 13, the coarse powder is sent to the object to be ground 1 through the return path 11 to carry out the aforementioned grinding, and the ground material 10 is returned from the outlet 5 to the classifier 13 and again. After classification, the fine powder is passed through the route 12 to obtain a desired finely ground product.

[0005]

However, in the conventional collision type airflow crusher having the decompression section supply type crushing nozzle, the accelerating tube 3 is effective in the injection nozzle constituted by the compressed air supply nozzle 2 and the accelerating tube 3. The relationship between the length L and the spread angle θ (see FIG. 12) cannot be said to be sufficiently appropriate, and under normal pressure, the jet jet flow when passing through the accelerating pipe 3 is Sufficient expansion cannot be obtained on the wall surface and the engine stalls during passage. Further, if the effective length L is short, the acceleration distance becomes insufficient, and if the effective length L is too long, pressure loss occurs and deceleration causes stall. Also, in the decompression unit feed type crushing nozzle that has the crushed material supply port inside the acceleration tube, the trajectory and distribution of the crushed object inside the acceleration tube cannot be determined as the center of the acceleration tube due to the effect of the air flowing in from the crushed object supply port, and acceleration Since the generation of vortices inside the crusher and the back pressure control range are not fixed after the pipe, the setting that can maximize the efficiency of the collision member and the acceleration pipe has not been made.

In order to solve such a problem, the divergence angle θ of the accelerating tube 3 is set to 7 ° in JP-A-3-26349, JP-A-3-26350, and JP-A-3-26349. An injection nozzle defined within a range of up to 9 ° has been proposed, but it has not always been possible to obtain sufficient pulverization processing capacity.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to make effective use of the energy of a compressed gas to improve the crushing capacity of a collision type air flow. To provide a crusher.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a compressed gas supply nozzle, an accelerating pipe connected to the compressed gas supply nozzle and having a pulverized material supply port, and the acceleration are provided. In a collision type airflow pulverizer provided with a collision member for colliding and crushing an object to be crushed, which is arranged in a subsequent stage of the tube, an acceleration pipe line in the acceleration pipe is provided from a nozzle throat to an effective outlet of the acceleration pipe. L, L / 2 = L ₁ , the effective distance along the common center line of the compressed gas supply nozzle and the acceleration tube, the divergence angle of the acceleration tube θ, and the acceleration at the position of the distance L ₁ from the nozzle throat. Set the divergence angle of the inner peripheral surface of the pipe to θ ₁
In this case, there is provided a collision type airflow crusher characterized by being formed in a spread shape satisfying the relational expression shown in the following [Equation 1].

[Number 1] Ltan (θ / 2) ≧ L 1 tan (θ 1/2)>
(1/2) Ltan (θ / 2) Further, according to the present invention, in the above-mentioned configuration, when the diameter of the nozzle throat is D, the acceleration pipeline in the acceleration tube is represented by the following [Equation 2]. Satisfies the relational expression described above and θ is 1 ° to 7
There is provided a collision type airflow crusher characterized by being formed in a spread shape having L in the range of 8D to 30D at 0 °.

## EQU00002 ## 1.8D.gtoreq.Ltan (.theta. / 2) .gtoreq.0.13D According to the present invention, in the above structure, the pressure is 0.
A compressed gas of 7 MPa or more is used, and the collision member has a shape in which the jet flow from the acceleration tube causes a non-uniform flow and collides while being dispersed, and the acceleration pipe line of the acceleration pipe is 3] is satisfied and θ is 2 ° to 7 °
Then, there is provided a collision type airflow crusher characterized in that L is formed in a spread shape having a range of 10D to 30D.

## EQU00003 ## 1.8D.gtoreq.Ltan (.theta. / 2) .gtoreq.0.19D According to the present invention, in the above structure, the pressure is 0.
A compressed gas of 7 MPa or less is used, and the collision member has a shape in which a jet flow from the acceleration tube causes a non-uniform flow and collides while being dispersed, and the acceleration pipe line of the acceleration pipe is 4] is satisfied and θ is 2 ° to 7 °
Then, there is provided a collision type airflow crusher characterized in that L is formed in a spread shape having a range of 8D to 25D.

## EQU00004 ## 1.2D.gtoreq.Ltan (.theta. / 2) .gtoreq.0.19D Further, according to the present invention, in the above-mentioned structure, the jet from the accelerating tube causes uneven flow or dispersion in the collision member. In addition, the accelerating pipe of the accelerating pipe satisfies the relational expression shown in the following [Equation 5] and θ is 1 °.
Provided is a collision type airflow crusher, which is formed in a spread shape having L in the range of 8D to 30D at -5 °.

## EQU00005 ## 0.78D.gtoreq.Ltan (.theta. / 2) .gtoreq.0.13D Further, according to the present invention, in the above structure, the accelerating tube is formed by arranging a plurality of annular bodies arranged side by side in the common central axis direction. According to another aspect of the present invention, there is provided a collision type airflow crusher, which is characterized in that the plurality of annular bodies can be divided from each other. Further, according to the present invention, there is provided a collision type airflow crusher characterized in that, in the above-mentioned structure, the collision member is installed so that a central axis of the collision member is different from the common center line. Further, according to the present invention, there is provided a collision type air flow crusher characterized in that, in the above configuration, the accelerating tube has a plurality of crushed object supply ports. Further, according to the present invention, in the above structure, the distance from the exit surface of the acceleration tube to the crushed object collision surface of the collision member along the common center line direction is Y, and the exit diameter of the acceleration tube is When D ₀ , the collision type airflow crusher is provided in which the collision member is installed so as to satisfy the relational expression represented by the following [Equation 6].

[6] _{Y = M × D 0/4} 15 ≧ M ≧ 6 Furthermore, according to the present invention, the in between in the above structure, to the object to be crushed impact surface of the exit surface and said impact member of the pressurized-speed tube A collision type airflow crusher is provided, which is provided with a cover that limits a side space of a flow path of a high-speed airflow from an acceleration tube.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A collision type air flow crusher according to the present invention will be described in detail below with reference to the drawings. The collision type airflow crusher of the present invention ejects from the acceleration tube 3 into the crushing chamber 7 after the depressurization part supply acceleration pipe 3 that accelerates the transportation of the crushed object 6 through the crushed object supply port 1 by the high-speed airflow. This is an improved crusher having a structure provided with an impact surface 9 (see FIG. 12) for crushing the crushed object 6 to be crushed by the impact force. When the high-pressure gas ejected from the supply nozzle 2 passes through the acceleration tube 3, it becomes supersonic due to ideal adiabatic expansion. Therefore,
Since the collision and crushing are performed in the state of being dispersed in the collision member 4, the crushed object 6 can be crushed with high efficiency with little variation up to the order of several μm.

A first collision type air flow crusher (the device of claim 1)
Location) First, a description will be given of a first collision type air pulverizer according to the present invention. FIG. 1 is a schematic vertical sectional view of a compressed gas supply nozzle 2 and an accelerating pipe 3 in this collision type airflow crusher. The first collision-type airflow crusher includes a compressed gas supply nozzle 2, an accelerating pipe 3 connected to the compressed gas supply nozzle 2 and having a crushed substance supply port 1, and a crushed substance arranged in a subsequent stage of the accelerating pipe 3. In a collision-type airflow crusher including a collision member 4 for colliding and crushing 6, compressed gas from the nozzle throat portion 2a to the effective outlet portion 3b of the acceleration pipe 3 The effective distance along the common center line C between the supply nozzle 2 and the accelerating tube 3 is L, L / 2 = L ₁ , the divergence angle of the accelerating tube 3 is θ, and the accelerating tube 3 at a position at a distance L ₁ from the nozzle throat 2a. When the divergence angle of the inner peripheral surface portion is θ ₁ , it is characterized in that it is formed in a divergent shape that satisfies the relational expression shown in [Formula 1] below.

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

1 to 3, the nozzle throat 2a, the diameter D of the nozzle throat 2a, the effective lengths L and L ₁ of the accelerating tube 3 and the divergence angles θ, θ ₁ and θ according to the present specification will be described. The definition of ₂ will be described. The nozzle throat portion 2 a is the narrowest portion between the compressed gas supply nozzle 2 and the acceleration tube 3. In FIG. 1 and FIGS. 7 and 8 described later, the nozzle throat portion 2a is shown as having no width in the longitudinal direction, but it may also have a width in the longitudinal direction as shown in FIGS. 2 and 3. is there. In FIG. 2, the narrowest portion has the same size and width in the longitudinal direction, and the portion between 2p and 2q is the nozzle throat portion 2a. FIG. 3 shows the case where the narrowest portion has different widths in the longitudinal direction and the portion between 2p and 2q is the nozzle throat portion 2a. Further, in FIGS. 1, 7, and 8, the nozzle throat portion 2a is formed on the joint boundary surface between the acceleration tube 3 and the compressed gas supply nozzle 2, but the invention is not limited to this.
It may exist inside both the compressed gas supply nozzle 2 and the acceleration tube 3. The diameter D of the nozzle throat portion 2a means the diameter of the smallest diameter portion in the narrowest portion of the acceleration pipe 3 or the compressed gas supply nozzle 2, as shown in FIG. As shown in FIG. 3, the effective distance L is an extension line l _{3 of a} contour line representing the tapered inner peripheral surface of the acceleration tube ₃ and a minimum center of the narrowest portion, and is parallel to the common center line C. When the point of intersection with the straight line l ₄ is 2b, it means the distance from the point of intersection 2b to the effective exit portion 3b of the acceleration tube along the common center line C. Therefore, when the value of the narrowest portion showing the nozzle throat portion 2a has the same size and width in the longitudinal direction as shown in FIG. 2, the effective distance L of the acceleration tube 3 is closest to the acceleration tube effective outlet portion 3b. It is the distance from the position of the nozzle throat 2a to the effective exit portion 3b of the acceleration tube. As shown in FIGS. 1 and 3, the distance L ₁ is a distance along the common center line C where the distance from the intersection 2b is 1/2 of the effective distance L. As shown in FIGS. 1 and 3, the divergence angle θ of the accelerating pipe 3 means a point on the inner peripheral surface of the accelerating pipe at the joint boundary position between the accelerating pipe 3 and the compressed gas supply nozzle 2 and acceleration at the accelerating pipe effective outlet portion 3b. A line 1 connecting a point on the inner peripheral surface of the pipe and a common center line C
It is an angle that is twice the angle formed by. As shown in FIG. 3, the divergence angle θ ₁ of the inner peripheral surface portion of the acceleration tube 3 at the position at a distance L ₁ from the nozzle throat portion 2a means that the distance along the common center line C from the intersection 2b is L ₁ . It is an angle obtained by doubling the angle formed by the common center line C and a line l ₁ connecting a point on the inner peripheral surface of an accelerating tube and the intersection 2b. As shown in FIG. 1, the divergence angle θ2 refers to a point 3a on the inner peripheral surface of the acceleration tube 3 whose distance from the intersection 2b along the common center line C is L ₁ and the acceleration tube effective outlet portion 3b. It is an angle obtained by doubling the angle formed by the connecting line l ₂ and the common center line C.

[0012] In the above _{configuration, L 1 tan (θ 1/} 2)
If is out of the above range, the air accelerating ability is deteriorated due to the air layer peeling and the influence of shock waves. In the configuration shown in FIG. 1, the accelerating pipe line of the accelerating pipe 3 is formed by joining two inner peripheral surfaces of the accelerating pipes having different taper angles, but if the above relational expression is satisfied, It may be a curved surface including a polygonal shape. Further, in the configuration shown in FIG. 1, the joining point between the inner peripheral surfaces of two acceleration tubes having different taper angles and the nozzle throat 2
The point 3a on the inner peripheral surface of the acceleration pipe at the position of the distance L ₁ from a coincides with each other, but may be different as long as the above relational expression is satisfied.

In the collision type air flow crusher having the above-mentioned structure, the crushed object 6 supplied from the crushed object supply port 1 to the acceleration tube 3 is conveyed by the air flow ejected from the compressed gas supply nozzle 2. In this case, the airflow reaching the sonic velocity in the nozzle throat portion 2a is accelerated to supersonic speed by the portion of the spread angle θ _{1 and} the gas velocity can be maintained by the portion of the spread angle θ ₂ . Then, since the collision and crushing are performed in a state of being dispersed in the collision member 4, the crushed object 6 can be crushed with high efficiency with little variation up to the order of several μm.

A second collision type airflow crusher (the device of claim 2)
Location) a second collision type air pulverizer according to the present invention, given the configuration of the first collision type air pulverizer, and further, the acceleration tube 3
When the diameter of the nozzle throat portion 2a is D, the internal acceleration pipe satisfies the relational expression shown in the following [Equation 2], and θ is in the range of 1 ° to 7 ° and L is in the range of 8D to 30D. It is characterized in that it is formed in a spread shape.

[Expression 2] 1.8D ≧ Ltan (θ / 2) ≧ 0.13D

In the above-mentioned structure, as a factor that Ltan (θ / 2) deviates from the above range, if deviates from the above range, air layer separation and air expansion will be insufficient, and if L deviates from the above range, powder acceleration will occur. Due to the defects, the pulverizability decreases. The absolute value of D is usually about 5 to 30 mm, and the absolute value of L is usually about 4 to 90 cm.

Since the second collision type airflow crusher employs the above-mentioned structure, in addition to the advantages of the first collision type airflow crusher, there is an advantage that the energy of the compressed gas and the characteristics of the compressible fluid can be effectively utilized. is there.

A third collision type airflow crusher (the device of claim 3)
Third collision type air pulverizer according location) the invention, given the configuration of the second collision type air pulverizer, and further, the pressure is intended to use a more compressed gas 0.7 MPa, impact member 4 However, the jet flow from the accelerating tube 3 has a shape that causes a drift and collides while being dispersed, and the accelerating conduit of the accelerating tube 3 satisfies the relational expression shown in the following [Equation 3], and θ is 2 °
It is characterized in that it is formed in a spread shape in which L is in the range of 10D to 30D at -7 °.

## EQU00003 ## 1.8D.gtoreq.Ltan (.theta. / 2) .gtoreq.0.19D This collision type airflow crusher is suitable for crushing an object to be crushed having a particularly low crushability.

In the above structure, the shape of the collision member 4, that is, the shape in which the jet flow from the accelerating tube 3 causes a drift and collides while being dispersed means a polygonal or polyhedral shape such as a cone shape or a pyramid shape. Examples thereof are shown as 4 ₂ in FIG. 4 and 4 ₃ in FIG. Further, in the above structure, when Ltan (θ / 2) deviates from the above range, when θ deviates from the above range, air separation and air expansion become insufficient, and Ltan
If the values are out of the above range, the pulverizability is lowered due to poor powder acceleration.

According to the third collision type air flow crusher, the crushability of the crushed object having low crushability can be further improved, and the amount of fine powder generated by over-crushing can be greatly reduced. be able to.

A fourth collision type airflow crusher (the device of claim 4)
Fourth collision type air pulverizer according location) the invention, given the configuration of the second collision type air pulverizer, and further, which is pressure using the following compressed gas 0.7 MPa, impact member 4 However, the jet flow from the accelerating tube 3 has a shape that causes a drift and collides while being dispersed, and the accelerating conduit of the accelerating tube 3 satisfies the relational expression shown in the following [Equation 4], and θ is 2 °
It is characterized in that it is formed in a spread shape in which L is in the range of 8D to 25D at -7 °.

## EQU00004 ## 1.2D.gtoreq.Ltan (.theta. / 2) .gtoreq.0.19D This collision type airflow crusher is suitable for crushing an object to be crushed, which has particularly good crushability.

In the above structure, the shape of the collision member 4, that is, the shape of the jet flow from the accelerating tube 3 in which the jet flow produces a drift and is dispersed and dispersed, is the same as in the case of the third collision type airflow crusher. Further, in the above configuration, Ltan
If (θ / 2) deviates from the above range, it may cause deterioration of pulverization due to poor acceleration of the core in the accelerating tube 3 and thermal agglomeration of powder due to excessive wind speed. Further, when θ is out of the above range, air separation occurs, and when L is out of the above range, pulverizability is deteriorated due to poor powder acceleration.

According to the fourth collision type air flow pulverizer, in pulverizing the pulverized object having relatively good pulverizability, the amount of fine powder generated by over-pulverization is significantly reduced, and the molten agglomerate due to the pulverization heat is generated. It is possible to reduce the production amount of.

A fifth collision type airflow crusher (the device of claim 5)
Location) fifth collision type air pulverizer according to the present invention, given the configuration of the second collision type air pulverizer, and further, the collision member 4, either jet from the acceleration tube 3 is biased flow, the dispersion It has a shape that does not occur and directly collides, and the acceleration pipe line of the acceleration pipe 3 satisfies the relational expression shown in the following [Equation 5], and θ is 1
It is characterized in that it is formed in a divergent shape in which L is in the range of 8D to 30D at an angle of 5 °.

[Expression 5] 0.78D ≧ Ltan (θ / 2) ≧ 0.13D

In the above configuration, the shape of the collision member 4, that is, the shape of the jet flow from the acceleration tube 3 in which the jet flow does not cause uneven flow or dispersion and directly collides means that the acceleration member 3 collides with the collision member 4.
It means that there is no obstacle between it and the collision surface 9 that affects the air flow. Examples of which are illustrated in 4 ₁ of FIG. Further, in the above configuration, if Ltan (θ / 2) deviates from the above range, it may cause deterioration of pulverization due to poor air acceleration in the accelerating tube 3 or overpulverization due to excessive wind speed. Further, when θ is out of the above range, air separation occurs, and when L is out of the above range, pulverizability is deteriorated due to poor powder acceleration.

According to the fifth collision type air flow pulverizer, the pulverizing ability is slightly lower than those of the third and fourth collision type air flow pulverizers, but the generation of fine powder due to overpulverization is more effective. It is possible to prevent this, and it is possible to pulverize with high efficiency while ensuring a high yield.

Next, a modified example of the collision type airflow crusher according to the present invention will be described. First, a first modification is shown in FIG. This collision-type airflow crusher is the same as the above-mentioned first to fifth collision-type airflow crushers, but the expansion outlet 3c is provided in the effective outlet 3b at the end of the acceleration tube 3 to rapidly expand the outlet of the acceleration tube 3. It is a thing. Providing such a spread outlet 3c reduces the turbulence of the air in the crushing chamber 7 in addition to the effects obtained by the first to fifth collision type airflow crushers, and the classifier 1
3 has an advantage that the powder fluid can be smoothly flowed. The divergence angle θ in this case is an angle set by the nozzle throat 2a and the accelerating pipe effective outlet 3b, and not the angle set by the nozzle throat 2a and the divergent outlet 3c.

Next, a second modification (apparatus according to claim 6) is shown in FIG. This collision-type airflow crusher has the above first to fifth features.
In the collision-type airflow crusher of
And 3e are arranged in the longitudinal direction of the accelerating tube 3 and are connected so as to be separable from each other. In the collision type air flow crusher, the material to be crushed is conveyed to the acceleration tube effective outlet 8 by the high-pressure gas ejected from the compressed gas supply nozzle 2. The material to be crushed has a true specific gravity, a bulk density, and a particle size depending on the application and type. The distribution is different. In order to form a crushing air flow suitable for different objects to be crushed, the above-mentioned θ ₁
Freely configure a combination of theta ₂ between the object to be crushed as spread shape of the acceleration tube 3 can be accelerated to a high speed can be easily formed in an optimum state is obtained by dividing Combination configured to be capable of accelerating tube 3 . In addition, in FIG. 8, two annular bodies are combined to form the accelerating tube 3, but three or more annular bodies may be connected. As a method of connecting the annular bodies, for example, a method such as knock pin, screwing, and fitting with a spigot can be used.

Next, a third modification (apparatus of claim 7) is shown in FIG. This collision-type airflow crusher has the above first to fifth features.
In the collision type airflow crusher, the collision member 4 is installed so that its axis Z is different from the common center line C.
Here, the axis line Z being different from the common center line C means that the axis line Z does not exist on the extension of the common center line C, and includes the case where the two lines C and Z are parallel to each other. By setting the axis Z in accordance with the physical properties, locus, and distribution of the object 6 to be crushed in the acceleration tube 3, the crushing efficiency can be further improved.

Next, a fourth modification (apparatus according to claim 8) will be described. This collision-type airflow crusher is the same as the first to fifth collision-type airflow crushers provided with a plurality of crushed object supply ports 1 provided in the acceleration pipe 3. The plurality of crushed material supply ports 1 may be installed in the circumferential direction, in the common centerline C direction, or both in the circumferential direction and the common centerline C direction. Good. In the depressurization part supply type acceleration tube, when the crushed object supply port 1 is one location, the locus or distribution of the crushed object in the acceleration tube may differ from the center of the accelerating tube due to the influence of the air flowing from the crushed object supply port 1. Therefore, there is a concern that the crushing efficiency may be lost. Therefore, as shown in FIG. 9, a plurality of crushed object supply ports 1 are provided in the accelerating tube 3 symmetrically about the common center line C, or the crushed object is further reversed in the accelerating tube 3 in the common center line C direction. By adding the supply port 1a, it is possible to accelerate the object 6 to be crushed with an ideal distribution having the common center line C as a peak, which leads to crushing efficiency. At this time, the setting of the common center line C of the crusher does not need to be limited to the horizontal direction, and the crusher can be attached in any direction.

Next, a fifth modification will be described. This collision type airflow crusher is the center from the exit surface of the acceleration tube effective outlet 8 to the crushed object collision surface 9 of the collision member 4 as shown in FIG. When the effective distance of the line is Y and the diameter of the effective exit portion 8 of the acceleration tube is D ₀ , the collision member 4 is installed so as to satisfy the relational expression shown in the following [Equation 6].

[6] the common center line of _{Y = M × D 0/4} 15 ≧ M ≧ 6 grinding object impact surface 9 of this time constant M and the air passage cross-sectional area of the effective outlet 8 of the acceleration tube 3 collides member 4 It shows the expansion constant of the air passage area perpendicular to C and is referred to as the collision surface air passage area constant here. According to the study by the present inventors, the above constant M is satisfied under the condition that the crushing compressed air pressure is 1.5 MPa or less, and the M value needs to be increased as the crushing compressed air pressure increases. confirmed. Regarding the effective distance Y, the center of the acceleration tube effective outlet portion 8 is set to be the shortest perpendicular to the flat surface portion of the crushed object collision surface portion 9 of the collision member 4, excluding the projection vertex, and there is no flat surface portion. In this case, the average value of the shortest perpendicular distances of the portion that is closest to the central axis Z of the collision member 4 is set. When the collision member 4 is installed under the above conditions, there is an advantage that the powder accelerated in the acceleration tube 3 can maintain collision energy by reducing the rise in back pressure at the exit of the acceleration tube 3.

Next, a sixth modification (apparatus according to claim 10).
Is shown in FIG. This collision type airflow crushing device is the first
In the fifth collision-type airflow crushing device, the side space of the flow path of the high-speed airflow from the acceleration tube 3 is limited between the outlet surface 8 of the acceleration tube 3 and the crushed object collision surface 9 of the collision member 4. A cover 25 is provided. That is, a closed line 21 centered on the acceleration tube 3 on the accelerating tube exit surface 8 of the crushing chamber, and an axial direction from the accelerating tube exit surface 8 to the collision member crushed object collision surface 9 on the crushing chamber wall surface 22. It has a surface-shaped cover 25 that connects a closed line 24 centered on the acceleration tube 3 in the position 23. Generally, in the crusher including the structure of the acceleration tube 3 and the collision member 4, the acceleration tube 3 and the collision member 4 are used.
During this period, a large vortex is generated in the side space of the high-speed airflow 14 from the accelerating tube 3, and the effect of this is that the grinding efficiency is reduced. Therefore, by providing a cover for removing the vortex generating portion space, vortices can be reduced, air can easily flow to the downstream, and at the same time, grinding efficiency can be improved.

Although some modified examples have been described above, the structures of these modified examples may be used alone or in appropriate combination.

[0033]

Embodiments of the present invention will be described below. Example 1 (according to claim 4) Polyester resin 100 parts by weight Phthalocyanine-based pigment 8 parts by weight Toner pigments having the above formulation were mixed in a mixer, and the mixture was melt-kneaded at about 200 ° C. in an extruder. Then, it was cooled and solidified, and the cooled product of the melt-kneaded product was roughly crushed into particles of 200 to 2000 μm by a hammer mill. This coarsely pulverized material was used as an object to be pulverized and pulverized by a classifier and a flow shown in FIG. A fixed wall air classifier was used as a classifier for classifying the crushed powder into fine powder and coarse powder.

Compressed gas supply nozzle 2 of collision type air flow crusher
Compressed air having a pressure of 0.686 MPa is introduced from the crushed material supply port 1 shown in FIG.
Supplied at the rate of The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 18.5 D, θ = 5 °, θ ₁ = 8.9.
And θ ₂ = 1 ° are used, and as the collision member, a collision member 4 ₂ shown in FIG. The collision surface 9 was installed at a position 80 mm away from the exit 8 of the acceleration tube 3 where the surface air passage area constant M was 8.5, and continuous operation was performed for 12 hours. As a result, the volume average particle diameter is 9 μm.
A fine powder having a particle size of 4 μm or less and 14% of the total amount of fine powder generated was obtained.

Example 2 (according to claim 5) The same pulverized material 6 as in Example 1 was pulverized with a classifier and a flow shown in FIG. A fixed wall air classifier was used as a classifier for classifying the crushed powder into fine powder and coarse powder. Compressed gas supply nozzle 2 for collision type air flow crusher
Compressed air having a pressure of 0.686 MPa is introduced from the pulverized material supply port 1 shown in FIG. 1 to the pulverized material 6 at 30 kg / Hr.
Supplied at the rate of The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 18.5 D, θ = 3 °, θ ₁ = 6 °, θ ₂
= 1 ° is used, and the collision member 41 shown in FIG. 6 is used as the collision member, which has a shape in which the jet flow from the acceleration tube 3 directly collides with neither uneven flow nor dispersion. The collision surface 9 was installed at a position 80 mm away from the exit portion 8 of the acceleration tube 3 where the passage area constant M was 8.5, and continuous operation was performed for 12 hours. As a result, a fine powder having a volume average particle diameter of 9 μm and a generation amount of fine powder of 4 μm or less was 12% of the whole was obtained.

Example 3 (according to claim 6) The same pulverized material 6 as in Example 1 was pulverized with a classifier and a flow shown in FIG. A fixed wall air classifier was used as a classifier for classifying the crushed powder into fine powder and coarse powder. Compressed gas supply nozzle 2 for collision type air flow crusher
Compressed air having a pressure of 0.686 MPa is introduced from the pulverized material supply port 1 shown in FIG. 1 to the pulverized material 6 at 30 kg / Hr.
Supplied at the rate of The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

Although the accelerating tube 3 and the collision member have the same shape and size as those of the third embodiment, the accelerating tube 3 of the third embodiment has a non-dividable structure. In the example, as shown in FIG. 8, a nozzle that can be divided at the position from the nozzle throat 2a to L ₁ was used, and continuous operation was performed for 12 hours. As a result, a fine powder having a volume average particle diameter of 9 μm and a generation amount of fine powder of 4 μm or less was 12% of the whole was obtained.

Comparative Example 1 The same pulverized material 6 as in Example 1 was pulverized by the classifier and flow shown in FIG. A fixed wall air classifier was used as a classifier for classifying the crushed powder into fine powder and coarse powder. Compressed gas supply nozzle 2 for collision type air flow crusher
Compressed air having a pressure of 0.686 MPa is introduced from the pulverized material supply port 1 shown in FIG.
Supplied at the rate of The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 25 D, θ = θ ₁ = θ ₂ = 7 °, and as the collision member, the jet flow from the accelerating tube 3 causes a non-uniform flow, and the shape is shown in FIG. using the collision member 4 ₂ shown, impact surface air passing area constant M is 8.
The collision surface 9 was installed at a position 80 mm apart from the exit portion 8 of the accelerating tube 3 which was No. 5, and continuous operation was performed for 12 hours. As a result, fine powder having a volume average particle diameter of 9 μm and a generation amount of fine powder having a particle diameter of 4 μm or less was 18% of the whole was obtained.

Further, under the conditions of Comparative Example 1, it was tried to introduce compressed air of 0.882 MPa from the compressed gas supply nozzle 2, but melt agglomerates were generated and the experiment could not be continued, and the supply amount was reduced. However, it was not effective in preventing the formation of melt aggregates.

Comparative Example 2 The same pulverized material 6 as in Example 1 was pulverized by the classifier and flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air with a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the collision type air flow crusher, and
17 kg / H of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 25 D, θ = θ ₁ = θ ₂ = 7 °, and the jet from the accelerating tube 3 is deflected as a collision member.
Any of the dispersion of the shape of direct collision does not occur, by using the collision member 4 ₁ shown in FIG. 5, the impact surface than the acceleration tube 3 outlet 8 for the mounting dimensions collision surface air passage area constant M becomes 8.5 9 was installed at a distance of 80 mm and continuously operated for 12 hours. As a result, the volume average particle diameter was 9 μm, and the particle diameter was 4
A fine powder having a generation amount of fine powder of less than μm of 14% of the whole was obtained.

Further, 0.882 MPa compressed air was introduced from the compressed gas supply nozzle 2 under the conditions of Comparative Example 2, but melt agglomerates were generated and the experiment could not be continued, and the supply amount was reduced. However, it was not effective in preventing the formation of melt aggregates.

Example 4 (according to claim 3) Styrene acrylic resin 100 parts by weight Phthalocyanine pigment 8 parts by weight Toner pigments having the above formulation were mixed in a mixer, and this mixture was extruded at about 200 ° C. After melt-kneading, the mixture was cooled and solidified, and the cooled product of the melt-kneaded mixture was roughly crushed into particles of 200 to 2000 μm with a hammer mill. This coarsely pulverized product was used as an object to be pulverized and pulverized with a pulverizer and a flow shown in FIG. A fixed wall air classifier was used as a classifier for classifying the crushed powder into fine powder and coarse powder.

Compressed gas supply nozzle 2 of collision type air flow crusher
Compressed air having a pressure of 0.882 MPa is introduced from the pulverized material supply port 1 shown in FIG. 1 to the pulverized material 6 at 34 kg / Hr.
Supplied at the rate of The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The accelerating tube 3 is designated as D in FIG.
= 9 mm, L = 25 D, θ = 7 °, θ ₁ = 12.8 °,
θ ₂ = 1 ° is used, and as the collision member, the collision member 4 ₂ shown in FIG. 4 having a shape in which the jet flow from the accelerating tube 3 causes a drift and is dispersed and collided is used. The collision surface 9 was installed at a position 80 mm apart from the exit 8 of the acceleration tube 3 where the passage area constant M was 8.5, and continuous operation was performed. As a result, the volume average particle diameter was 9 μm, and the particle diameter was 4
A fine powder having a generation amount of fine particles of not more than μm of 16% of the whole was obtained.

Example 5 (according to claim 4) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air with a pressure of 0.686 MPa was introduced from the compressed gas supply nozzle 2 of the collision type air flow crusher, and
28 kg / H of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 18.5 D, θ = 5 °, θ ₁ = 8.9.
°, using those theta ₂ = 1 °, as the collision member, jet drift from accelerating tube 3, the shape of the collision while being dispersed, using a collision member 4 ₂ shown in FIG. 4, the impact surface air The collision surface 9 was installed at a position 80 mm apart from the exit 8 of the acceleration tube 3 where the passage area constant M was 8.5, and continuous operation was performed. As a result, the volume average particle size was 9 μm, and the particle size was 4 μm.
A fine powder having a fine powder generation amount of m or less of 14% of the whole was obtained.

Example 6 (according to claim 5) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
30 kg / H of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 18.5 D, θ = 3.5 °, θ ₁ = 6
°, using those theta ₂ = 1 °, as the collision member, using jet drift from the acceleration tube 3, none of the variance of the shape impinging directly without generating a collision member 4 ₁ shown in FIG. 6 Then, the collision surface 9 is installed at a position where the collision surface 9 is separated by 80 mm from the exit portion 8 of the acceleration tube 3 where the collision surface air passage area constant M becomes 8.5.
Two hours of continuous operation was performed. As a result, the volume average particle size was 9 μm, and the amount of fine powder with a particle size of 4 μm or less was 1% of the whole.
A fine powder of 2% was obtained.

Example 7 (according to claim 6) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
34 kg / H of crushed material 6 from crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

As the accelerating tube 3 and the collision member, those having the same shape and size as those of the fifth embodiment were used, but the accelerating tube 3 of the fifth embodiment has a non-dividable structure. In the example, as shown in FIG. 3, a nozzle that can be divided at the position of L ₁ from the throat portion 2a was used, and continuous operation was performed for 12 hours. As a result, fine powder having a volume average particle diameter of 9 μm and a generation amount of fine powder having a particle diameter of 4 μm or less was 16% of the whole was obtained.

Example 8 (according to claim 7) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
36.5 kg of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied at a ratio of / Hr. The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 25 D, θ = 7 °, θ ₁ = 12.8 °,
θ ₂ = 1 ° is used, and as the collision member, the collision member 4 ₂ shown in FIG. The collision surface air passage area constant M is set at a distance of 8.5, the apex of the cone of the collision member 4 ₂ becomes the center of the high-speed jet flow 14, and the central axis Z of the collision member 4 is 5 ° downward from the common center line C. The setting was made so that continuous operation was performed for 12 hours. As a result, the volume average particle diameter was 9 μm, and the particle diameter was 4
A fine powder was obtained in which the generation amount of fine powder of μm or less was 20% of the whole.

Example 9 (according to claim 8) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
37 kg / H of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The acceleration tube 3 is D = 9 m in FIG.
m, L = 25D, θ = 7 °, θ ₁ = 12.8 °, θ ₂ = 1
And the object to be crushed supply port 1 installed on the inner circumference of the accelerating pipe 3 at 8 equal intervals is used. As a collision member, the jet flow from the accelerating pipe 3 causes uneven flow and is dispersed. shapes of collision, using the collision member 4 ₂ shown in FIG. 4, the impact surface 9 from the acceleration tube 3 outlet 8 which impact surface air passing area constant M is 8.5 is placed at a position 80mm apart, 12 Continuous operation was performed for an hour. As a result, the volume average particle diameter is 9 μm.
A fine powder having a particle size of 4 μm or less and 20% of the total amount of fine powder generated was obtained.

Example 10 (according to claim 9) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
36 kg / H of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The acceleration tube 3 is D = 9 m in FIG.
m, L = 25D, θ = 7 °, θ ₁ = 12.8 °, θ ₂ = 1
The collision member 4 ₂ shown in FIG. 4 having a shape in which the jet from the accelerating tube 3 causes a non-uniform flow and collides while being dispersed as the collision member. It was installed at a distance such that the area constant M was 11, and continuously operated for 12 hours. As a result, the volume average particle size is 9μ.
m, and 20% of the total amount of fine powder with a particle size of 4 μm or less is generated.
A fine powder was obtained.

Example 11 (according to claim 10) The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
36.5 kg of the crushed material 6 from the crushed material supply port 1 shown in
It was supplied at a ratio of / Hr. The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The acceleration tube 3 is D = 9 m in FIG.
m, L = 25D, θ = 7 °, θ ₁ = 12.8 °, θ ₂ = 1
The collision member 4 ₂ shown in FIG. 4 having a shape in which the jet from the accelerating tube 3 causes a non-uniform flow and collides while being dispersed as the collision member. It was installed at a distance such that the area constant M was 8.5, a conical space deleting cover was provided in front of the collision surface 9, and 12 hours of continuous operation was performed. As a result, a fine powder having a volume average particle diameter of 9 μm and a generation amount of fine powder having a particle diameter of 4 μm or less was 20% of the whole was obtained.

Comparative Example 3 The same pulverized material 6 as in Example 4 was pulverized with a classifier and a flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
20 kg / H of crushed material 6 from crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 25 D, θ = θ ₁ = θ ₂ = 7 °, and as the collision member, the jet flow from the accelerating tube 3 causes a non-uniform flow, and the shape is shown in FIG. using the collision member 4 ₂ shown, impact surface air passing area constant M is 8.
The collision surface 9 was installed at a position 80 mm apart from the exit portion 8 of the accelerating tube 3 which was No. 5, and continuous operation was performed for 12 hours. As a result, fine powder having a volume average particle diameter of 9 μm and a generation amount of fine powder having a particle diameter of 4 μm or less was 18% of the whole was obtained.

Comparative Example 4 The same pulverized material 6 as in Example 4 was pulverized by the classifier and flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type air flow pulverizer, and the pulverized material 6 was supplied from the pulverized material supply port 1 shown in FIG. 1 at a rate of 17 kg / Hr. The obtained pulverized product 10 was sent to the classifier 13, fine powder was removed as classified powder, and coarse powder was again charged into the accelerating pipe 3 as the pulverized product 6 together with the powder material from the pulverized product supply port 1.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 25 D, θ = θ ₁ = θ ₂ = 7 °, and the jet from the accelerating tube 3 is deflected as a collision member.
Any of the dispersion does not occur, the shape of direct collision, using the collision member 4 ₁ shown in FIG. 6, the collision surface 9 from the acceleration tube 3 outlet 8 which impact surface air passing area constant M is 8.5 80
They were installed at positions separated by mm, and continuously operated for 12 hours. As a result, the volume average particle size was 9 μm, and the particle size was 4 μm.
A fine powder having a fine powder generation amount of m or less of 14% of the whole was obtained.

Comparative Example 5 The same pulverized material 6 as in Example 4 was pulverized by the classifier and flow shown in FIG. A fixed wall type air classifier was used as a classifier for classifying the pulverized powder into fine powder and coarse powder. Compressed air having a pressure of 0.882 MPa was introduced from the compressed gas supply nozzle 2 of the collision type airflow crusher, and
20 kg / H of crushed material 6 from crushed material supply port 1 shown in
It was supplied in the ratio of r. The crushed product 10 obtained is a classifier 13
, Fine powder is removed as classified powder, coarse powder again,
The pulverized material was supplied from the pulverized material supply port 1 into the acceleration tube 3 as the pulverized material 6 together with the powder raw material.

The accelerating tube 3 is indicated by D in FIG.
= 9 mm, L = 25 D, θ = 7 °, θ ₁ = 12.8 °,
θ ₂ = 1 ° is used, and as the collision member, the collision member 4 ₂ shown in FIG. Install at the position where the surface air passage area constant M becomes 5.5, and
Two hours of continuous operation was performed. As a result, the volume average particle size was 9 μm, and the amount of fine powder with a particle size of 4 μm or less was 2% of the total.
A fine powder of 0% was obtained.

The crushing / classifying conditions and results of Examples 1 to 12 and Comparative Examples 1 to 5 are shown in the following [Table 1] and [Table 2], respectively.
Shown in

[0070]

[Table 1]

[0071]

[Table 2]

[0072]

As is apparent from the above description, claim 1
According to the collision type air flow pulverizer equipped with the decompression section supply type pulverization nozzle described in 10 to 10, the high pressure gas is accelerated into ultrasonic waves by the portion of the divergence angle θ _{1 in} the acceleration nozzle, and the divergence angle θ ₂
Since the speed is maintained uniform in the nozzle by the part of and the collision and crushing are performed in a state of being dispersed in the collision member, there is an effect that variability is small and highly efficient crushing is possible. Further, according to the collision type airflow crusher of claims 1 to 10, when a high pressure airflow of the same energy is used, it is possible to effectively derive the energy used for crushing, and the crushing processing capacity is improved, Since generation of fine powder due to over-pulverization can be prevented, a pulverized product having a narrow particle size distribution can be obtained. Further, by appropriately changing and setting the pressure of the high-pressure gas, it becomes possible to carry out the grinding suitable for the property of the material to be ground, and it is possible to carry out the grinding with high yield and high productivity. Also,
According to the collision type airflow crusher described in claim 6, since the acceleration tube is configured by combining a plurality of annular bodies that can be disassembled and assembled, it is optimal according to the use and type of the crushed object. The shaped accelerating nozzle can be easily selected and configured. Further, according to the collision type airflow crusher of claims 7 to 10, the crushing efficiency can be further enhanced. As described above, the collision type airflow crusher of the present invention can be very effectively applied to the production of fine powder products such as resins, agricultural chemicals, cosmetics and pigments having a particle size of micron.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing the structure of a jet nozzle in a collision type airflow crusher of the present invention.

FIG. 2 is a schematic vertical cross-sectional view showing an example of the effective distance configuration of the acceleration tube in the collision type airflow crusher of the present invention.

FIG. 3 is a schematic vertical cross-sectional view showing another example of the effective distance configuration of the acceleration tube in the collision type airflow crusher of the present invention.

FIG. 4 is a schematic vertical sectional view showing the shape of a collision member in the collision type airflow crusher of the present invention.

FIG. 5 is a schematic vertical sectional view showing the shape of a collision member in the collision-type airflow crusher of the present invention.

FIG. 6 is a schematic vertical sectional view showing the shape of a collision member in the collision type airflow crusher of the present invention.

FIG. 7 is a schematic vertical cross-sectional view showing another configuration of the ejection nozzle in the collision type airflow crusher of the present invention.

FIG. 8 is a schematic vertical cross-sectional view showing still another configuration of the ejection nozzle in the collision type airflow crusher of the present invention.

FIG. 9 (a) is a view showing the collision type airflow crusher of the present invention,
A schematic vertical sectional view showing the positional relationship between the ejection nozzle and the collision member,
(B) is a sectional view seen from A.

FIG. 10 is a schematic vertical cross-sectional view showing the positional relationship between the crushed object supply port of the ejection nozzle and another collision member in the collision type airflow crusher of the present invention.

FIG. 11 is a schematic vertical cross-sectional view showing the configuration of the crushing chamber in the collision type airflow crusher of the present invention.

FIG. 12 is a schematic explanatory view of a crushing device including a collision type airflow crusher and a classifier.

[Explanation of symbols]

1 crushed object supply port 2 compressed gas supply nozzle 2a nozzle throat 2b, 3a point 3 acceleration tube 3b effective outlet section 3c divergent outlet section 3d, 3e annular body 4, 4 ₁ , 4 ₂ collision member 5 discharge port 6 crushed Item 7 Crushing chamber 8 Accelerator pipe outlet 9 Collision surface 10 Crushed substance 11, 12 Path 13 Classifier 14 High-speed airflow C Common centerline D Nozzle throat diameter L Effective length of accelerating pipe θ Divergence Z Centerline of collision member 1a Different configuration of crushed material supply port Y Distance between acceleration tube outlet and collision surface 21 Acceleration tube outlet surface position of crushing chamber cover 22 Grinding chamber wall surface 24 Grinding chamber wall surface position of crushing chamber cover 25 Grinding chamber cover

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiko Watanabe 1-3-6 Nakamagome, Ota-ku, Tokyo Stock company Ricoh Company (72) Kazuyuki Matsui 1-3-3 Nakamagome, Ota-ku, Tokyo Stock Within Ricoh Company (72) Inventor Satoru Okano 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Company, Ltd.

Claims (10)

[Claims] 1. A compressed gas supply nozzle, an accelerating pipe connected to the compressed gas supply nozzle and having an object to be crushed supply port, and arranged at a stage subsequent to the accelerating pipe for colliding and crushing an object to be crushed. In a collision-type airflow crusher including a collision member, an acceleration pipe line in the acceleration pipe is effective along a common center line of the compressed gas supply nozzle and the acceleration pipe from a nozzle throat to an effective outlet of the acceleration pipe. When the distance is L, L / 2 = L ₁ , the divergence angle of the accelerating tube is θ, and the divergence angle of the inner peripheral surface portion of the accelerating tube at a distance L ₁ from the nozzle throat is θ ₁ , A collision type airflow crusher characterized by being formed in a spreading shape satisfying the relational expression shown in [Equation 1]. [Number 1] Ltan (θ / 2) ≧ L 1 tan (θ 1/2)>
(1/2) Ltan (θ / 2) 2. The acceleration pipe line in the acceleration pipe satisfies the relational expression shown in the following [Formula 2], where θ is 1 ° to 7 °, and L is L, where D is the diameter of the nozzle throat. Is formed in a spreading shape in the range of 8D to 30D, The collision type airflow crusher according to claim 1, wherein [Expression 2] 1.8D ≧ Ltan (θ / 2) ≧ 0.13D 3. A compressed gas having a pressure of 0.7 MPa or more is used, and the collision member has a shape in which a jet flow from the acceleration tube causes a drift and collides while being dispersed, and the acceleration tube. The accelerating pipe of No. 1 satisfies the relational expression shown in the following [Formula 3], and is formed in a spread shape having θ of 2 ° to 7 ° and L in the range of 10D to 30D. The collision type airflow crusher according to claim 2. ## EQU00003 ## 1.8D ≧ Ltan (θ / 2) ≧ 0.19D 4. A compressed gas having a pressure of 0.7 MPa or less is used, and the collision member has a shape in which a jet flow from the acceleration tube causes a non-uniform flow and collides while being dispersed, and the acceleration tube. The accelerating pipeline of No. 1 satisfies the relational expression shown by the following [Formula 4], and is formed in a spread shape in which θ is 2 ° to 7 ° and L is in the range of 8D to 25D. The collision type airflow crusher according to claim 2. (4) 1.2D ≧ Ltan (θ / 2) ≧ 0.19D 5. The collision member has a shape in which the jet flow from the acceleration tube directly collides with neither uneven flow nor dispersion, and the acceleration pipe line of the acceleration pipe has the following [Formula 5]. Satisfying the relational expression shown by, θ is 1 ° to 5 °, and L is 8D to 30.
The collision type airflow crusher according to claim 2, wherein the collision type airflow crusher is formed in a spread shape in the range of D. [Expression 5] 0.78D ≧ Ltan (θ / 2) ≧ 0.13D 6. The accelerating tube is configured by arranging and coupling a plurality of annular bodies in the common central axis direction, and the plurality of annular bodies can be divided from each other. The collision type airflow crusher according to any one of claims 1 to 5. 7. The collision type air flow crushing according to claim 1, wherein the collision member is installed so that a central axis of the collision member is different from the common center line. Machine. 8. The collision type airflow crusher according to claim 1, wherein the accelerating tube has a plurality of crushed object supply ports. 9. The distance from the exit surface of the acceleration tube to the crushed object collision surface of the collision member along the common center line direction is Y,
When the outlet diameter of the acceleration tube is D ₀ , the following [Equation 6]
The collision type airflow crusher according to any one of claims 1 to 5, wherein the collision member is installed so as to satisfy the relational expression shown by. [6] _{Y = M × D 0/4} 15 ≧ M ≧ 6 10. A cover for limiting a side space of a flow path of a high-speed air flow from the acceleration tube is provided between an exit surface of the acceleration tube and a crushed object collision surface of the collision member. The collision type airflow crusher according to any one of claims 1 to 5.