JPH0760150A - Impact type pneumatic pulverizer - Google Patents

Abstract

PURPOSE:To effectively pulverize a powder raw material by making the relationship between the nozzle length of a nozzle for feeding high pressure gas, the length of an accelerating pipe and the utmost adjacent distance between the projecting central part of an impact member and an outer peripheral impact surface and the widening angle of a high pressure gas feeding nozzle satisfy prescribed conditions. CONSTITUTION:An accelerating pipe 1 has a feeding port 5 for a material to be crushed at the rear end part. An impact surface has a projecting central part 16 and an outer peripheral impact surface 17 has the form of a pyramid. A pulverizing chamber 13 has a side wall 15 for further pulverizing the material to be pulverized which has been pulverized by an impact member 11. And the nozzle length L1 (>=0) of a high pressure gas feeding nozzle 3 having a high pressure gas feeding nozzle throat diameter (a) (>0), the length L2 (>0) of the accelerating pipe 1, and the utmost adjacent distance L3 (>0) between the apex of the projecting central part 16 and the outer peripheral impact surface 17 in the impact member 11 satisfy the formula 1. Further, the widening angle theta1 of the high pressure gas feeding nozzle satisfies the conditions of the formula II in the range of 0 deg.<=theta1<=20 deg., provided that in the formula II, (b) and (c) represent the diameter of the throat of the accelerating pipe 1 and the diameter of the bottom surface of the projecting part having the form of a pyramid of the impact member 11 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision type air flow pulverizer for pulverizing a powder raw material by using a jet air flow (high pressure gas), and more particularly to a toner or a toner coloring used in an image forming method by electrophotography. The present invention relates to a collision type airflow pulverizer for efficiently producing resin powder.

[0002]

2. Description of the Related Art A collision type air flow pulverizer for pulverizing a powder raw material by using a jet airflow conveys the powder raw material by a jet airflow and ejects the powder raw material from an accelerating pipe outlet, which is provided in front of the accelerating pipe outlet. The powder material is crushed by the collision force, and the impact force is crushed.

The details will be described below with reference to a conventional collision type airflow crusher shown in FIG.

In the conventional collision type air flow crusher, a collision member 25 is provided so as to face the outlet 24 of the acceleration tube 23 connected to the high pressure gas supply nozzle 22, and the high pressure gas supplied to the acceleration tube 23 accelerates the acceleration. The powder material is sucked into the accelerating pipe 23 from the pulverized material supply port 21 communicated with the middle of the pipe 23, and the powder raw material is jetted together with the high pressure gas to collide with the colliding surface of the colliding member 25. It was made to be crushed.

However, in the above-mentioned conventional example, the pulverized material supply port 21 is connected to the middle of the acceleration tube 23, and the powder material sucked and introduced into the acceleration tube is the pulverized material supply port 21.
Immediately after the passage, the high-pressure gas jetted from the high-pressure gas supply nozzle rapidly disperses and accelerates while rapidly changing the flow path toward the exit of the accelerating pipe. In this state, relatively coarse particles in the powder raw material have passed through the low flow part of the acceleration tube due to the influence of the inertial force, and those with relatively fine particles have passed through the high flow part of the acceleration tube, resulting in high pressure. The powder raw material is not sufficiently uniformly dispersed in the air stream, and the powder raw material separates into a flow having a high concentration of the powder raw material and a flow having a low concentration of the powder raw material, and the powder raw material partially concentrates and collides with the facing collision member, which reduces the pulverization efficiency. This causes a decrease in processing capacity. Further, in the above-mentioned conventional example, the pulverized product which collides against the collision surface and is pulverized is secondary (or tertiary) collided with the inner wall of the pulverization chamber and further pulverized. However, there is a drawback that secondary crushing does not occur and the fine pulverization processing capacity cannot be improved.

On the other hand, the collision surface of the collision member in the conventional crusher is, as shown in FIGS. 11 and 12, the direction of the particle mixed air flow on which the object to be crushed is placed, that is, the right angle or the inclination (for example, 45 degrees) with respect to the acceleration tube. Flat plate (Japanese Patent Laid-Open No. 57-50554 and Japanese Patent Laid-Open No. 58-14385)
No. 3 gazette) is used, and has the following drawbacks.

In the case of the collision surface 26 perpendicular to the axial direction of the accelerating tube 23 as shown in FIG. 11, the crushed material blown out from the accelerating tube outlet 24 and the crushed material reflected by the collision surface 26 collide with each other.
The coexistence ratio is high in the vicinity of 6, and therefore the collision surface 26
The concentration of powder (ground material and ground material) in the vicinity increases,
The crushing efficiency is not good.

Further, in the crusher of FIG. 12, since the collision surface 26 is inclined with respect to the axial direction of the acceleration tube 23, the powder concentration near the collision surface 26 is smaller than that of the crusher of FIG. However, the collision force due to the high pressure air flow is dispersed and decreases. Further, it cannot be said that the secondary collision with the side wall 28 of the crushing chamber is effectively used. For example, as shown in FIG.
When the angle of the collision surface 26 is inclined by 45 degrees with respect to the accelerating tube, the above problems are less likely to occur when the thermoplastic resin is crushed. However, since the impact force used for crushing at the time of collision is small and the crushing due to the secondary collision with the crushing chamber wall 28 is small, the crushing capacity is 1/2 to 1/1 as compared with the crusher of FIG. The crushing ability drops to 0.5.

Next, Japanese Utility Model Laid-Open No. 1-148740 and Japanese Unexamined Patent Publication No. 1-254266 have been proposed as collision type airflow crushers in which the above problems are solved. In the former,
As shown in FIGS. 14 and 15, by arranging the raw material collision surface 26 of the collision member at a right angle to the axis of the accelerating tube, and providing a conical projection 31 on the raw material collision surface, It has been proposed to prevent the reflected flow of the.

In the latter case, as shown in FIG. 13, the tip portion of the collision surface of the collision member has a specific conical shape to reduce the powder concentration in the vicinity of the collision surface, and the crushing chamber side wall 28.
A collision-type airflow crusher has been proposed in which secondary collision is efficiently performed.

By constructing the crusher as described above, the conventional problems are considerably improved, but they are still not sufficient, and as a recent need, finer pulverized products are desired. A crushing method with good crushing efficiency and quality is desired.

On the other hand, the toner or the colored resin powder for toner used in the image forming method by the electrophotographic method usually contains at least a binder resin and a colorant or magnetic powder. The toner develops the electrostatic charge image formed on the latent image carrier, and the formed toner image is transferred to a transfer material such as plain paper or a plastic film, and then heated fixing means, pressure roller fixing means or heating pressure roller. The toner image on the transfer material is fixed to the transfer material by a fixing device such as fixing means. Therefore, the binder resin used for the toner has a characteristic of being plastically deformed when heat and / or pressure is applied.

At present, a toner or a binder resin powder for a toner is obtained by melt-kneading a mixture containing at least a binder resin and a colorant or a magnetic powder (and optionally a third component) to obtain a melt-kneaded product. It is prepared by cooling, crushing the cooled product, and classifying the crushed product. Generally, the cooled product is crushed (or medium crushed) by a mechanical impact crusher, and then the crushed coarse powder is finely crushed by a collision type air flow crusher using a jet stream. is there.

In such a case, in the conventional collision type air flow crusher and crushing method as shown in FIG. 11, if it is attempted to further improve the processing capacity, the powder raw material supply port provided in the accelerating tube 23 is insufficiently sucked. Occurrence or a fusion substance is generated on the collision surface 26, and stable production cannot be performed. Therefore, in order to more efficiently generate the toner or the colored resin powder for the toner used in the image forming method by the electrophotographic method, an efficient pulverization method that solves the above problems is desired.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a collision type air flow crusher capable of efficiently crushing powder raw materials.

That is, an object of the present invention is to provide a collision type air flow pulverizer which can efficiently pulverize a powder raw material by ejecting powder from an accelerating tube outlet with good dispersion to prevent agglomerated powder in the accelerating tube. Especially.

Another object of the present invention is to prevent the occurrence of local abrasion of the collision surface without reducing the impact force when the powder ejected from the acceleration tube outlet collides with the collision surface of the collision member. Accordingly, it is an object of the present invention to provide a collision type airflow crusher capable of efficiently crushing powder raw materials.

Further, an object of the present invention is to provide a collision type in which the powder raw material ejected from the accelerating pipe outlet and colliding with the collision surface of the collision member further collides with the inner wall of the crushing chamber to effectively carry out a multiple collision. It is to provide an airflow crusher.

Another object of the present invention is to provide a collision type airflow crusher capable of efficiently crushing powder mainly composed of a thermoplastic resin.

Further, it is an object of the present invention to provide a collision type airflow crusher capable of efficiently producing toner or colored resin particles for toner used in a copying machine and a printer having a heating and pressure roller fixing means. is there.

Further, the object of the present invention is to obtain an average particle size of 20-2.
An object of the present invention is to provide a collision type airflow pulverizer capable of efficiently pulverizing resin particles having a particle diameter of 000 μm to an average particle size of 3 to 15 μm.

[0022]

The present invention has an accelerating tube for accelerating the conveyance of an object to be pulverized by a high-pressure gas and a pulverizing chamber for finely pulverizing the object to be pulverized. Is a collision type airflow crusher equipped with a collision member having a collision surface provided facing the opening surface of the outlet of the acceleration tube, and the object to be crushed is supplied into the acceleration tube at the rear end of the acceleration tube. The collision surface has a protruding central portion, and the outer peripheral collision surface has a cone shape, and the crushing chamber is crushed by the collision member. Has a side wall for further crushing the object to be crushed by collision, the nozzle length L ₁ (≧ 0) of the high pressure gas supply nozzle having the throat diameter a (> 0) of the high pressure gas supply nozzle, and the acceleration pipe length L
₂ (> 0) and the closest distance L ₃ (> 0) between the apex of the protruding central portion of the collision member and the outer peripheral collision surface is 2 (L ₁ + L ₃ ) / 3 <L ₂ <3 · L ₃ And the divergence angle θ ₁ of the high pressure gas supply nozzle is 0 ° ≦ θ
₁ ≦ 20 ° range _{a + 2 · L 1 tan (} θ 1/2) <b <c / 2 condition is (b:: accelerating tube throat diameter, c protrusion bottom diameter having a cone-shaped collision member) The present invention relates to a collision type airflow crusher characterized by satisfying the following.

[0023] In addition, the collision type air pulverizer, spreading angle theta ₂ is 0 ° ≦ θ ₂ ≦ 20 ° range b + ₂ · L 2 tan acceleration tube _{(θ 2/2) <c} <d (d The outer peripheral collision surface diameter) is satisfied, and at the same time, in the collision type airflow crusher, the apex angle θ ₃ of the protruding central portion of the collision member and the apex angle θ ₄ of the outer peripheral collision surface are 0 ° <θ ₃ <0 ° <θ ₃ <θ ₄ <180 ° at 90 _{DEG, d + 2 · L 3 tan} (θ 3/2)>e> d (e: grinding chamber _{diameter, c = 2 · L 3 tan} ( about θ _3/2)) collision type air pulverizer, characterized by satisfying the condition is.

According to the crusher of the present invention, it is possible to efficiently pulverize the powder, which is the raw material to be powdered, to the order of several μm by utilizing the high-speed air stream.

In particular, the powder of the thermoplastic resin or the powder containing the thermoplastic resin as the main component can be efficiently pulverized to the order of several μm using a high-speed air stream.

[0026]

The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a collision type air flow crusher of the present invention and a diagram showing a crushing method by a flow chart combining a crushing process using the crusher and a classifying process by a classifier. 2 is an enlarged cross-sectional view of the collision type airflow crusher of FIG. 1, FIG. 3 is an enlarged cross-sectional view of the accelerating pipe throat portion and the high-pressure gas jet nozzle taken along the line AA of FIG. 1, and FIG. FIG. 5 is a cross-sectional view showing the crushing chamber and the collision member along the line BB, and FIG. 5 is a cross-sectional view showing the high pressure gas supply port and the high pressure gas chamber along the line C-C in FIG.

First, the method of pulverizing the powder raw material by the collision type air flow pulverizer of the present invention will be described with reference to FIG.
The crushed material supplied from the crushed material supply cylinder 6 has a high pressure in which the center and the inner wall of the accelerating tube throat portion 2 of the accelerating tube 1 whose central axis is vertically arranged are coaxial with the central axis of the accelerating tube 1. Object to be crushed supply port 5 formed between the outer wall of the gas ejection nozzle 3
To reach. On the other hand, the high-pressure gas is introduced from the high-pressure gas supply port 7, passes through the high-pressure gas chamber 7, passes through one, preferably a plurality of high-pressure gas introduction pipes 9, and rapidly from the high-pressure gas ejection nozzle 3 toward the acceleration pipe outlet 10. Gush while expanding. At this time, due to the ejector effect generated in the vicinity of the accelerating pipe throat portion 2, the crushed substance is sucked toward the accelerating pipe outlet 10 from the crushed substance supply port 5 while being entrained in the gas coexisting with the crushed substance. In the accelerating tube throat portion 2, the high-velocity airflow is uniformly mixed and suddenly accelerated, and the collision surface of the collision member 11 facing the accelerating tube outlet 10 is in a state of a uniform solid-gas mixture airflow with no uneven dust concentration. It collides and is crushed. In the crusher shown in FIG. 1, the collision surface of the collision member has a protrusion-shaped central portion 16 protruding in the shape of a cone, and a primary crushed substance crushed around the protrusion central portion at the protrusion central portion. Outer peripheral collision surface 1 for further crushing by collision
Have 7. Further, the crushing chamber 13 has a crushing chamber wall 15 for tertiaryly crushing the secondary crushed material that has been crushed secondarily on the outer peripheral collision surface by collision.

Since the impact force generated at the time of collision is applied to the sufficiently dispersed individual particles (objects to be crushed), crushing can be performed very efficiently. The crushed material crushed on the collision surface of the collision member 11 further repeats a tertiary collision between the inner wall surface of the crushing chamber wall 15 having a circular or elliptical cross section and the surface of the collision member 11 to further increase the pulverization efficiency. , Collision member 11
The crushed material is discharged from the crushed material discharge port 14 arranged at the rear.

Further, since the collision surface of the collision member 11 has the protruding central portion 16 protruding in the shape of a cone and the outer peripheral collision surface 17 around the protruding central portion, the collision surface is resinous or adhesive. In the case of crushing things, fusion, aggregation, coarsening does not occur, it is possible to crush in a state where the dust concentration is increased, and in the case of abradable objects to be crushed, the inner wall of the acceleration tube or The wear generated on the collision surface of the collision member is not locally concentrated, the life is extended, and stable operation is possible.

FIG. 2 shows an enlarged sectional view of FIG. 1, which will be described in more detail.

As described above, the conical surface of the collision member 11 is provided with the cone-shaped projection having the central portion 16 projecting, so that the solid-gas mixture flow of the pulverized raw material and the compressed air ejected from the acceleration tube 1 is formed. Is first pulverized on the surface of the protruding central portion 16, further secondary pulverized on the outer peripheral collision surface 17, and then tertiary pulverized on the pulverization chamber wall 15. At this time, the high-pressure gas is rapidly accelerated in the accelerating pipe 1 together with the powder material from the high-pressure gas supply nozzle throat 4 diameter a (> 0) to be introduced into the crusher, and the accelerating pipe outlet 10
The high-pressure gas supply nozzle length L ₁ (≧ 0) and the acceleration pipe length L ₂ (>
0) and the closest distance L ₃ from the acceleration tube outlet to the outer collision surface
(> 0) has a relational expression of 2 (L ₁ + L ₃ ) / 3 <L ₂ <3 · L ₃ , and the acceleration tube throat 2 diameter b and the collision member 11
The spreading angle theta ₁ (0 ° ≦ θ ₁ ≦ 20 ° range) of the projecting central portion 16 bottom diameter c and a high-pressure gas supply nozzle having a cone _{shape, a + 2 · L 1 tan} (θ 1/2) <b It has a relational expression of <c / 2, and the outer peripheral collision surface 17 diameter d of the collision member 11 and the divergence angle θ ₂ (range of 0 ° ≦ θ ₂ ≦ 20 °) of the acceleration tube 1 are b + 2 · L ₂ tan (θ _2/2) <c <has d relationship, the apex angle theta ₃ of the projecting central portion of the collision member (0
° <θ ₃ <90 DEG) and the outer peripheral colliding surface apex angle theta ₄ of 0
° <There ° θ ₃ <θ ₄ <180, the grinding chamber 13 diameter e is very efficient pulverization carried out when satisfying the _{d + 2 · L 3 tan (} θ 3/2)>e> d relations Be done.

When 2 (L ₁ + L ₃ ) / 3 ≧ L ₂ , high-pressure gas in the accelerating tube is injected from the outlet of the accelerating tube during underexpansion, so that the suction processing amount of the powder raw material decreases and Since the acceleration of the body material is insufficient, the impact force on the collision surface of the collision member is weakened and the pulverization efficiency is reduced, which is not preferable.

When L ₂ ≧ 3 · L ₃ , the high-pressure gas in the accelerating tube is overexpanded and ejected from the accelerating tube outlet, so that the flying speed of the crushed object is reduced near the collision surface of the collision member and the impact is reduced. This is not preferable because the force is weakened and the grinding efficiency is reduced.

[0035] In _{addition, a + 2 · L 1 tan} (θ 1/2) ≧
In the case of b, the diameter of the accelerating tube throat becomes equal to or smaller than the outlet diameter of the high-pressure gas supply nozzle, so that the sending of the air flow from the high-pressure gas supply nozzle to the accelerating tube is hindered, and a vortex flow occurs near the accelerating tube throat. This is not preferable because the amount of suction processing of the powder raw material falls into a shortage, resulting in a decrease in pulverization efficiency.

When b ≧ c / 2, the diameter of the accelerating tube throat increases and the cross-sectional area of the crushed material supply port increases,
It is not preferable because the sucking speed is reduced and the throughput is also reduced.

[0037] In _{addition, b + 2 · L 2 tan} (θ 2/2)
When ≧ c, the diameter of the bottom surface of the projection having the cone shape of the collision member becomes equal to or smaller than the exit diameter of the accelerating pipe, and the collision cross-sectional area on the collision surface of the collision member decreases, so that the effects of primary crushing and secondary crushing are obtained. Is reduced, which is not preferable.

When c ≧ d, the outer peripheral collision surface of the collision member does not exist, and this relational expression does not hold.

[0039] In _{addition, d + 2 · L 3 tan} (θ 3/2)
When ≦ e, it is not preferable because the distance between the crushing chamber wall and the outer peripheral end of the collision member is too large to obtain effective tertiary crushing.

When e ≦ d, the crushing chamber wall does not exist, and this relational expression does not hold.

As described above, L ₁ , L ₂ , L ₃ , a,
b, c, d, e, θ ₁ , θ ₂ , θ ₃ , and θ ₄ are 2 (L ₁ + L ₃ ) / 3 <L ₂ <3 · L ₃ 0 ° <θ ₃ <θ ₄ <180 ° a + 2 · _{L 1 tan (θ 1/2} ) to satisfy the <b <c / 2 b + 2 · L 2 tan (θ 2/2) <c <d d + 2 · L 3 tan (θ 3/2)>e> d conditions At times, as shown in FIG. 2, the grinding efficiency can be improved. That is, the ejector effect generated near the throat part of the accelerating tube is sufficiently exerted, the air suction capacity at the object to be pulverized supply port is improved, and the conveying ability of the powder raw material in the accelerating tube is improved, so that the pulverizing process is performed. The object to be crushed by increasing the amount and rapidly accelerating and jetting from the accelerating tube outlet can improve primary, secondary, and tertiary crushing and crushing efficiency by the collision member.

Further, 6 ° ≦ θ ₁ ≦ 12 °, 6 ° ≦ θ ₂ ≦
12 °, 10 ° <θ ₃ <80 °, 100 ° <θ ₄ <17
When the above relational expression is satisfied in the range of 0 °, the suction processing capacity into the acceleration tube is improved, and after ejecting from the acceleration tube, primary, secondary and tertiary pulverization is efficiently performed, further improving the pulverization efficiency. It is preferable because it can be caused.

The structure of the collision type airflow pulverizer according to the pulverizing method of the powder raw material of the present invention is not limited to that shown in FIG. FIG. 6 is a schematic cross-sectional view of another preferred embodiment of the present invention and a flow chart of a crushing apparatus which combines a crushing process using the collision type air flow crusher and a classifying process by a classifier, and FIG. 7 is shown in FIG. It is an expanded sectional view of a collision type airflow pulverizer, and FIG. 8 is a sectional view taken along the line A′-A ′.

Explaining the collision type air flow pulverizer of FIG. 6, an accelerating pipe 51 for accelerating the powder raw material by the high pressure gas introduced into the high pressure gas supply nozzle, and the accelerating pipe 51.
And a crushing chamber 63 having a collision surface for crushing the powder ejected from the crushing member by a collision force, and the collision member 61 is provided so as to face the accelerating pipe outlet. And the throat portion 54 of the high pressure gas supply nozzle 53
A powder raw material supply port 56 in the entire circumferential direction to the accelerating pipe is provided between the crushing chamber outlet 60 and the accelerating pipe outlet 60, and the crushing chamber has a substantially circular cross-sectional shape and the collision member. 61 is a collision type airflow crusher having a crushed material discharge port 64 at the rear.

Further, the central axis of the accelerating tube 51 has a vertical direction, and the collision surface of the collision member 61 has a projecting central portion 66 and a crushing central portion around the projecting central portion. It has an outer peripheral collision surface 67 for further crushing the primary crushed material to be crushed by collision. Also, the crushing chamber 63
Has a crushing chamber side wall 65 for tertiary crushing the secondary crushed material crushed secondarily on the outer peripheral collision surface by collision.

Explaining the action of the high-pressure gas, the high-pressure gas first enters from the high-pressure gas supply ports 57 on the left and right of the high-pressure gas chamber 58, and the arteries are made uniform by pressure fluctuations, and then the crushed material supply cylinder 55. A high-pressure gas supply nozzle 53 provided in the central portion of the gas flows into the acceleration pipe 51.

Both the accelerating tube 51 and the high-pressure gas supply nozzle 53 preferably have a divergent shape, and the high-pressure gas flowing into the accelerating tube 51 is accelerated to the supersonic region while expanding. In the process, the high pressure gas is decompressed, and the pressure of the gas at the exit of the accelerating pipe 51 becomes substantially the same as the pressure in the crushing chamber 63.

On the other hand, in the circular crushing chamber 63, when the gas in the crushing chamber 63 is sucked by the crushed material discharge port 64, a suction flow is generated inside the crushing chamber. Then, due to the action of this suction flow, the surface of the collision member 61 is in a reduced pressure state. The shape of the crushing chamber is not limited to this. Due to the depressurizing action of the surface of the collision member 61, the jet flow emitted from the acceleration pipe 51 is further accelerated and collides with the surface of the collision member 61. At this time, the object to be crushed is first crushed on the surface of the projecting central portion 66 on the collision surface of the collision member 61, further pulverized secondly on the outer peripheral collision surface 67, and then tertiary pulverized on the crushing chamber side wall 65.

Next, the operation of the powder raw material as the pulverized material will be described. The powder raw material supplied from the pulverized material supply cylinder 55 is supplied from the pulverized material supply port 56 at the lower portion of the supply cylinder to the acceleration pipe 51. Is sucked and discharged. The principle of suction and discharge of raw materials is
This is due to the ejector effect due to the expansion and decompression of the high-pressure gas in the acceleration tube. At this time, since the crushed object supply port 56 is provided between the throat portion 54 of the high-pressure gas supply nozzle 53 and the accelerating tube outlet 60 in the entire circumferential direction to the accelerating tube, it is sufficiently dispersed and accelerated by the high-speed airflow. It The crushed material supply port 56 is preferably provided in the entire circumferential direction. The powder raw material thus dispersed and sucked in the accelerating tube 51 is completely dispersed by the high-speed airflow radiated from the high-pressure gas supply nozzle 53 provided in the central portion of the pulverized material supply cylinder 55. It

Next, the dispersed raw material is accelerated by riding on the high-speed air current flowing inside the accelerating tube 51, and becomes a supersonic solid-gas mixture flow. After this solid-gas mixture flow exits the accelerating pipe 51, it becomes a solid-gas mixture jet, and collides with the collision member 61 by the same action as the aforementioned jet.

In the collision type air flow crusher of FIG. 6, the central axis of the accelerating tube is arranged in the vertical direction, and a specific raw material supply method is provided, so that the raw material powder to be pulverized is more strongly dispersed. Crushing efficiency can be improved, and excellent crushing processing capacity can be obtained.
Further, by homogenizing the dust concentration due to strong dispersion of the crushed object, the collision member, the acceleration tube and the local fusion and wear of the crushed object in the crushing chamber, as compared with the conventional collision type airflow crusher,
It can be greatly reduced and stable operation can be achieved.

Also in the collision type air flow crusher of FIG. 6, L ₁ , L ₂ , L ₃ , a, b, c, d, e, θ ₁ , θ ₂ ,
θ _3, θ ₄ is _{2 (L 1 + L 3)} / 3 <L 2 <3 · L 3 0 ° <θ ₃ <θ ₄ <180 ° _{a + 2 · L 1 tan (} θ 1/2) <b <c / when satisfying _{2 b + 2 · L 2 tan} (θ 2/2) <c <d d + 2 · L 3 tan (θ 3/2)>e> d condition, as shown in FIG. 6, to improve the grinding efficiency be able to.

As described above, the method for pulverizing the powder raw material by the collision type air flow pulverizer used in the present invention is as shown in FIGS. 3 and 8, from the circumferential direction of the accelerating tube throat section 2 to the accelerating tube 1. Since the powder raw material can be supplied inside, the dispersion of the powder raw material in the accelerating tube 1 is improved, so that the powder collides with the collision surface of the collision member 10 efficiently and the pulverization efficiency is improved. That is, compared with the conventional crusher, the processing capacity is improved, and the particle size of the obtained product can be made smaller with the same processing capacity.

Further, in the conventional example, since the powder raw material collides with the collision surface of the collision member in a state where the powder raw material is agglomerated, a fusion material is easily generated especially when powder mainly containing a thermoplastic resin is used as the raw material. However, according to FIGS. 1 and 6 of the present invention, since they collide with the collision surface of the collision member in the dispersed state, fusion is unlikely to occur.

Further, in the conventional example, since the powder raw material is agglomerated, there is a problem that over-pulverization is apt to occur, and the resulting pulverized product has a wide particle size distribution, but according to the present invention. In addition, over-pulverization can be prevented, and a pulverized product with a sharp particle size distribution can be obtained.

Further, due to the ejector effect generated in the vicinity of the throat portion of the accelerating tube, the air suction capacity at the material supply port for the material to be crushed is improved. The throughput can be increased as compared with the conventional one. The pulverizing method of the powder raw material using the collision type air flow pulverizer according to the present invention becomes more effective as the particle size becomes smaller.

Another embodiment of the present invention is shown in FIGS. 10 is an enlarged sectional view of FIG.

The powder raw material to be crushed is supplied from an object 72 to be crushed provided on the upper wall of the accelerating tube 71 to the accelerating tube 7.
1 is supplied. High-pressure gas such as compressed air is introduced into the accelerating pipe 71 from a high-pressure gas supply nozzle 79, and the powder raw material supplied to the accelerating pipe 71 is instantaneously accelerated,
Will have high speed. The powder material ejected from the accelerating pipe outlet 73 into the crushing chamber 78 at a high speed collides with the collision surface of the collision member 74 and is crushed. In the crusher of FIG. 9,
On the collision surface of the collision member, a protrusion-shaped central portion 75 protruding in the shape of a cone and a primary crushed substance crushed at the protrusion central portion around the protrusion central portion are further crushed by collision. It has a peripheral collision surface 76. Also, the crushing chamber 78
Has a crushing chamber side wall 77 for tertiary crushing the secondary crushed material crushed secondarily on the outer peripheral collision surface by collision.

A more detailed description will be given with reference to FIG. As described above, the solid-gas mixture flow of the powder material and the compressed air ejected from the accelerating tube is provided in the protruding central portion 7 by providing the conical member-shaped projection with the central portion protruding on the collision surface of the collision member.
After being first crushed on the surface of No. 5, further crushed on the outer peripheral collision surface 76, crushed on the side wall 77 of the crushing chamber.

At this time, even in the collision type airflow crusher shown in FIG. 9, L ₁ , L ₂ , L ₃ , a, b, c, d, shown in FIG.
e, θ ₁ , θ ₂ , θ ₃ , θ ₄ are 2 (L ₁ + L ₃ ) / 3 <L ₂ <3 · L ₃ 0 ° <θ ₃ <θ ₄ <180 ° a + 2 · L ₁ tan (θ ₁ / 2) to satisfy the <b <c / 2 b + 2 · L 2 tan (θ 2/2) <c <d d + 2 · L 3 tan (θ 3/2)>e> d condition, the grinding efficiency Can be improved.

In the conventional example, the powder material injected from the exit of the acceleration tube and colliding with the collision surface of the collision member has a high proportion of coexistence with the powder material injected from the exit of the acceleration tube due to the reflected flow and has a high dust concentration. However, according to FIGS. 1, 6 and 9 of the present invention, since the collision surface of the collision member has a protruding cone-shaped protruding central portion, the crushing efficiency is high. The crushed material after the collision is reflected toward the inner wall of the crushing chamber, so that the powder concentration does not increase and the crushing efficiency is improved. Further, it is preferable that the tip of the protruding central portion protruding from the collision surface of the collision member and the central axis of the acceleration tube substantially coincide with each other from the viewpoint of uniform crushing.

However, the collision type air flow crusher as shown in FIGS. 1 and 6 is different from the collision type air flow crusher having the structure shown in FIG. 9 in that the powder raw material is sucked and supplied into the accelerating pipe from the entire circumferential direction. The method of supplying raw materials into the acceleration tube is different in that
This is preferable because the powder raw material in the acceleration tube can be more uniformly dispersed and the pulverization efficiency can be further improved.

<Toner Production Example> An example of toner production by the crusher of the present invention and an example of toner production by the conventional crusher will be described.

Production Example 1 100 parts by weight of styrene-butyl acrylate-divinylbenzene copolymer (monomer polymerization weight ratio 80.0 / 19.0 / 1.0, Mw 350,000) Magnetic iron oxide (average particle size 0.18 μm) 100 parts by weight Nigrosine 2 parts by weight Low molecular weight ethylene-propylene copolymer 4 parts by weight

Henschel mixer FM
After thoroughly mixing with a -75 type (manufactured by Mitsui Miike Kakoki Co., Ltd.), it was kneaded with a twin-screw kneader PCM-30 type (manufactured by Ikegai Tekko Co., Ltd.) set at 150 ° C. The obtained kneaded product was cooled and roughly pulverized to 1 mm or less with a hammer mill to obtain a toner pulverized raw material. The obtained pulverized raw material was pulverized by the collision type air flow pulverizer shown in FIG. In the collision type air flow crusher, the throat diameter of the high pressure gas supply nozzle is 11 mm (a = 11), the length of the high pressure gas supply nozzle is 13 mm (L ₁ = 13), and the length of the acceleration tube is 100 mm (L ₂ = 100), assuming that the closest distance between the apex of the protruding central portion of the collision member and the outer peripheral collision surface is 57 mm (L ₃ = 57), the relational expression of 2 (L ₁ + L ₃ ) / 3 <L ₂ <3 · L ₃ Satisfied, the divergence angle of the high pressure gas supply nozzle is 10 ° (θ ₁ = 10), and the throat diameter of the accelerating tube is 20 mm.
(B = 20), 56mm the bottom diameter of the protrusion having a cone shape of the collision member (c = 56) when the _{a + 2 · L 1 tan (} θ 1/2) satisfies <b <c / 2 of equation To do. Furthermore, the crusher is spread angle 8 ° of the acceleration tube (theta ₂ = 8), when the outer peripheral colliding surface diameter of the collision member to 100mm (d = 100) b + 2 · L 2 tan (θ 2/2) < The relational expression of c <d is satisfied. Further, in the crusher, the apex angle of the cone-shaped protrusion of the collision member is 55 ° (θ ₃ = 55),
The apex angle of the outer peripheral colliding surface 160 ° (θ ₄ = 160), satisfies when the diameter of the grinding chamber to 140mm (e = 140) d + 2 · L 3 tan (θ 3/2)>e> d relations .

Pulverization was performed in a shape satisfying the above conditions. The pulverized raw material was supplied to the forced vortex type classifier at a rate of 46.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, the weight average diameter of the classified fine powder was 8.1.
A finely pulverized product for toner having a size of μm was obtained. It should be noted that stable operation could be performed without the generation of fused substances.

The particle size distribution of the finely pulverized product or toner can be measured by various methods, but in the present invention, it was measured using a Coulter Multisizer.

That is, a Coulter Multisizer II type (manufactured by Coulter) is used as a measuring device, and an interface (manufactured by Nikkaki) for outputting number distribution and volume distribution.
And CX-1 personal computer (Canon)
And a 1% NaCl aqueous solution is prepared by using special grade or primary grade sodium chloride as the electrolytic solution. As the measuring method, 0.1 to 5 ml of a surfactant, preferably an alkylbenzene sulfonate, is added as a dispersant to 100 to 150 ml of the electrolytic aqueous solution, and 2 to 20 mg of a measurement sample is further added. The electrolytic solution in which the sample is suspended is about 1 to 3 with an ultrasonic disperser.
Dispersion treatment is performed for a minute, and measurement is performed by the Coulter Multisizer II type using a 100 μm aperture as an aperture. The volume and number of fine powder and toner were measured, and the volume distribution and number distribution were calculated. Then, the weight-based weight average diameter obtained from the volume distribution according to the present invention was obtained from the volume distribution.

Production Example 2 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The collision type airflow crusher,
Throat diameter of high pressure gas supply nozzle is 11mm (a = 1
1), the length of the high pressure gas supply nozzle is 43 mm (L ₁ = 4
3) Assuming that the length of the accelerating tube is 83 mm (L ₂ = 83) and the closest distance between the apex of the projecting central portion of the collision member and the outer peripheral collision surface is 57 mm (L ₃ = 57), 2 (L ₁ + L ₃ ). / 3 <L ₂ <3 · L ₃ is satisfied, the divergence angle of the high pressure gas supply nozzle is 8 ° (θ ₁ = 8), and the throat diameter of the accelerating tube is 18 mm (b
= 18), a bottom diameter of the protrusion having a cone shape of the collision member is 56 mm (c = 56) to the _{a + 2 · L 1 tan (} θ 1/2) to satisfy the <b <c / 2 relationship. Moreover, the grinder, spread angle of 8 ° of the acceleration tube (θ ₂ = 8), the outer peripheral colliding surface diameter of the collision member to 100mm (d = 100) b + 2 · L 2 tan (θ 2/2) < The relational expression of c <d is satisfied. Further, in the crusher, the apex angle of the cone-shaped protrusion of the collision member is 55 ° (θ ₃ = 55),
The apex angle of the outer peripheral colliding surface is 160 ° (θ ₄ = 160), the diameter of the grinding chamber satisfies a 140mm (e = 140) to the _{d + 2 · L 3 tan (} θ 3/2)>e> d relations .

Pulverization was performed in a shape satisfying the above conditions. The pulverized raw material was fed to the forced vortex type classifier at a rate of 45.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, the weight average diameter of the classified fine powder was 8.1.
A finely pulverized product for toner having a size of μm was obtained. It should be noted that stable operation could be performed without the generation of fused substances.

Production Example 3 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The collision type airflow crusher,
Throat diameter of high pressure gas supply nozzle is 11mm (a = 1
1), length of high pressure gas supply nozzle 40 mm (L ₁ = 4
0), the length of the accelerating tube is 73 mm (L ₂ = 73), and the closest distance between the apex of the protruding central portion of the collision member and the outer peripheral collision surface is 57 mm (L ₃ = 57), 2 (L ₁ + L ₃ ). / 3 <L ₂ <3 · L ₃ is satisfied, the divergence angle of the high pressure gas supply nozzle is 8 ° (θ ₁ = 8), and the throat diameter of the accelerating tube is 19 mm (b
= 19), a bottom diameter of the protrusion having a cone shape of the collision member is 56 mm (c = 56) to the _{a + 2 · L 1 tan (} θ 1/2) to satisfy the <b <c / 2 relationship. Moreover, the grinder, spreading angle is 8 ° of the acceleration tube (theta ₂ = 8), the outer peripheral colliding surface diameter of the collision member to 90mm (d = 90) b + 2 · L 2 tan (θ 2/2) < The relational expression of c <d is satisfied. Further, in the crusher, the apex angle of the cone-shaped protrusion of the collision member is 50 ° (θ ₃ = 50),
The apex angle of the outer peripheral colliding surface is 160 ° (θ ₄ = 160), the diameter of the grinding chamber satisfies a 110mm (e = 110) to the _{d + 2 · L 3 tan (} θ 3/2)>e> d relations .

Crushing was performed in a shape satisfying the above conditions. The pulverized raw material is supplied to the forced vortex type classifier at a rate of 30.0 kg / hr by a constant quantity feeder, and the classified coarse powder is introduced into the collision type airflow pulverizer, and the pressure is 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, a weight average diameter of 8.0 as classified fine powder was obtained.
A finely pulverized product for toner having a size of μm was obtained. It should be noted that stable operation could be performed without the generation of fused substances.

Production Example 4 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The structure of the collision type airflow crusher used was the same as that used in Production Example 1. The pulverized raw material is supplied to the forced vortex type classifier at a rate of 30.0 kg / hr by a constant quantity feeder, and the classified coarse powder is introduced into the collision type airflow pulverizer, and the pressure is 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, a weight average diameter of 6.0 as classified fine powder was obtained.
A finely pulverized product for toner having a size of μm was obtained. It should be noted that stable operation could be performed without the generation of fused substances.

Production Example 5 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The structure of the collision type airflow crusher was the same as that used in Production Example 2. The pulverized raw material was fed to the forced vortex type classifier at a rate of 29.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, the weight average diameter of the classified fine powder was 6.1.
A finely pulverized product for toner having a size of μm was obtained. It should be noted that stable operation could be performed without the generation of fused substances.

Production Example 6 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The structure of the collision type airflow crusher was the same as that used in Production Example 3. The pulverized raw material was fed to the forced vortex type classifier at a rate of 18.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, a weight average diameter of 6.0 as classified fine powder was obtained.
A finely pulverized product for toner having a size of μm was obtained. It should be noted that stable operation could be performed without the generation of fused substances.

Comparative Production Example 1 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The high pressure gas supply nozzle has a throat diameter of 11 mm (a =
11), the length of the high pressure gas supply nozzle is 62 mm (L ₁ = 6
2), the length of the accelerating tube is 71 mm (L ₂ = 71), the closest distance between the apex of the projecting central portion of the collision member and the outer collision surface is 0 mm (L ₃ = 0), and the expansion of the high pressure gas supply nozzle The angle is 5.6 ° (θ ₁ = 5.6), the throat diameter of the accelerating tube is 16 mm (b = 16), and the bottom surface diameter of the protrusion having the cone shape of the collision member is 0 mm (c = 0). Furthermore,
The crusher has an accelerating tube spread angle of 5.6 ° (θ ₂ =
5.6), the outer peripheral collision surface diameter of the collision member is 100 mm (d =
100), and the crusher has an apex angle of 180 ° (θ ₃ = 1 where there is no cone-shaped projecting central portion of the collision member).
80), the apex angle of the outer collision surface is 180 ° (θ ₄ = 180)
And the diameter of the crushing chamber is 110 mm (e = 1
10).

Crushing was carried out under the above conditions. The pulverized raw material was supplied to the forced vortex type classifier at a rate of 18.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm ² ( G), 6.0N
After pulverizing with compressed air of m ³ / min, it was circulated through the classifier again to carry out closed circuit pulverization. As a result, a finely pulverized product for toner having a weight average diameter of 8.3 μm was obtained as classified fine powder.

When the supply amount is increased to 18.0 kg / hr or more, the weight average diameter of the fine powder obtained becomes large, and fusion of the pulverized material, agglomerates and coarse particles start to occur on the collision member.
The fused material may block the raw material inlet of the acceleration tube,
I couldn't drive stably.

Comparative Production Example 2 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The high pressure gas supply nozzle has a throat diameter of 11 mm (a =
11), the length of the high pressure gas supply nozzle is 62 mm (L ₁ = 6
2), the length of the accelerating tube is 71 mm (L ₂ = 71), the closest distance between the apex of the projecting center of the collision member and the outer peripheral collision surface is 0 mm (L ₃ = 0), and the divergence angle of the high-pressure gas supply nozzle Is 5.6 ° (θ ₁ = 5.6), the throat diameter of the accelerating tube is 16 mm (b = 16), and the bottom diameter of the conical protrusion of the collision member is 0 mm (c = 0). In the crusher, the accelerating tube spread angle is 5.6 ° (θ ₂ = 5.
6), the outer collision surface diameter of the collision member is 60 mm (d = 60)
Further, in the crusher, the apex angle of the collision member where the cone-shaped protruding central portion does not exist is 160 ° (θ ₃ = 160),
The outer peripheral collision surface is simply conical with the apex angle of 160 ° (θ ₄ = 160), and the diameter of the grinding chamber is 110 mm (e = 11).
0).

Crushing was performed under the above conditions. The pulverized raw material was supplied to the forced vortex type classifier at a rate of 22.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm ² ( G), 6.0N
After pulverizing with compressed air of m ³ / min, it was circulated through the classifier again to carry out closed circuit pulverization. As a result, a finely pulverized product for toner having a weight average diameter of 8.2 μm was obtained as classified fine powder.

When the supply amount was increased to 22 kg / hr or more, the weight average diameter of the fine powder obtained increased. In addition, generation of a fused substance was not recognized.

Comparative Production Example 3 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The high pressure gas supply nozzle has a throat diameter of 11 mm (a =
11), the length of the high pressure gas supply nozzle is 62 mm (L ₁ = 6
2), the length of the accelerating tube is 71 mm (L ₂ = 71), and the closest distance between the apex of the protruding central portion of the collision member and the outer peripheral collision surface is 53 mm (L ₃ = 53). Is 5.6 ° (θ ₁ = 5.6), the throat diameter of the accelerating tube is 16 mm (b = 16), and the bottom diameter of the cone-shaped projection of the collision member is 49 mm (c = 49),
Further, the crusher has a accelerating tube spreading angle of 5.6 ° (θ
₂ = 5.6), the outer collision surface diameter of the collision member is 60 mm (d
= 60), and in the crusher, the apex angle of the cone-shaped protrusion of the collision member is 50 ° (θ ₃ = 50), and the apex angle of the outer peripheral collision surface is 180 ° (θ ₄ = 180). ), And the diameter of the crushing chamber was 110 mm (e = 110).

Crushing was carried out under the above conditions. The pulverized raw material was supplied to the forced vortex type classifier at a rate of 22.0 kg / hr by a constant quantity feeder, and the classified coarse powder was introduced into the collision type air flow pulverizer, and the pressure was 6.0 kg / cm ² ( G), 6.0N
After pulverizing with compressed air of m ³ / min, it was circulated through the classifier again to carry out closed circuit pulverization. As a result, a finely pulverized product for toner having a weight average diameter of 8.2 μm was obtained as classified fine powder.

When the supply amount was increased to 22.0 kg / hr or more, the weight average diameter of the fine powder obtained increased. Although no generation of a coarse fusion product was observed, the collision member was inspected after the operation for 1 hour, and it was confirmed that a fusion layer of the pulverized product was slightly attached to the raw material collision surface. .

Comparative Production Example 4 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The structure of the collision type airflow crusher was the same as that used in Comparative Production Example 1. 8.0 kg / hr of crushed raw material with a constant quantity feeder
To a forced vortex type classifier, and the classified coarse powder is introduced into the collision type air flow pulverizer at a pressure of 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, the weight-average diameter of the classified fine powder was 6.4.
A finely pulverized product for toner having a size of μm was obtained. Supply amount 8.0 kg /
If it is increased to more than hr, the weight average diameter of the fine powder obtained becomes large, and fusion of the pulverized material, agglomerates, and coarse particles start to occur on the collision member, and the fusion material clogs the raw material inlet of the acceleration tube. In some cases, stable operation was not possible.

Comparative Production Example 5 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The structure of the collision type airflow crusher used was the same as that used in Comparative Production Example 2. 14.0 kg / hr of crushed raw material with a constant quantity feeder
To a forced vortex type classifier, and the classified coarse powder is introduced into the collision type air flow pulverizer at a pressure of 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, the weight average diameter of the classified fine powder was 6.2.
A finely pulverized product for toner having a size of μm was obtained.

Comparative Production Example 6 The same toner pulverization raw material as in Production Example 1 was used to pulverize with a collision type air flow pulverizer shown in FIG. The structure of the collision type air flow crusher used was the same as that used in Comparative Production Example 3. 14.0 kg / hr of crushed raw material with a constant quantity feeder
To a forced vortex type classifier, and the classified coarse powder is introduced into the collision type air flow pulverizer at a pressure of 6.0 kg / cm.
² (G), using 6.0 Nm ³ / min compressed air,
After crushing, it was circulated through the classifier again to carry out closed circuit crushing. As a result, the weight average diameter of the classified fine powder was 6.1.
A finely pulverized product for toner having a size of μm was obtained. Supply amount 14.0kg
The weight average diameter of the fine powder obtained was increased when the amount was increased to / hr or more. Although no generation of coarse fused material was observed, the collision member was inspected after the operation for 1 hour, and it was confirmed that a fused layer of the pulverized material was slightly attached to the raw material collision surface.

Table 1 below summarizes the results of the above Production Examples 1 to 6 and Comparative Production Examples 1 to 6. In this table, the pulverization efficiency ratio is expressed as a supply amount ratio under each condition when the supply amount in Comparative Production Example 2 is 1.0.

[0089]

[Table 1]

[0090]

As described above, according to the present invention,
The material to be crushed is uniformly dispersed and introduced so that there is no bias in the dust concentration in the accelerating tube, or even if the material to be crushed is introduced into the accelerating tube from one direction, the solid-gas mixture flow is sufficiently accelerated and expanded. Such a solid-gas mixture flow is jetted from the outlet of the accelerating pipe toward the opposing collision member with good dispersion, and is primary crushed at the cone-shaped protrusion central portion provided on the collision member. After the secondary crushing is performed on the cone-shaped outer peripheral collision surface provided around the crushing chamber, the crushing efficiency is significantly improved as compared with the conventional collision type airflow crusher because the crushing chamber side wall further performs the tertiary crush. Further, it is possible to prevent fusion, agglomeration, coarsening of the pulverized material and local wear on the inner surface of the acceleration tube and the collision surface of the collision member, and to efficiently perform secondary and tertiary collisions, resulting in high efficiency. It is possible to enable stable operation of the device while crushing. For this reason, the present invention is particularly effective in finely pulverizing powder mainly containing a thermoplastic resin such as toner.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of FIG.

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

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

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a schematic sectional view of another collision type airflow crusher of the present invention.

FIG. 7 is an enlarged sectional view of FIG.

8 is a cross-sectional view taken along the line A'-A 'of FIG.

FIG. 9 is a schematic sectional view of another collision type airflow crusher of the present invention.

10 is an enlarged cross-sectional view of FIG.

FIG. 11 is a schematic cross-sectional view showing a conventional collision type airflow crusher.

FIG. 12 is a schematic cross-sectional view showing another conventional collision type airflow crusher.

FIG. 13 is a schematic cross-sectional view showing another conventional collision type airflow crusher.

FIG. 14 is a schematic cross-sectional view showing another conventional collision type airflow crusher.

15 is a schematic cross-sectional view showing an example of a collision surface shape used in the collision type airflow crusher of FIG.

[Explanation of symbols]

 1,23,71 Accelerator tube 2,52,81 Accelerator tube throat part 3,53,79 High pressure gas supply nozzle 4,54,80 High pressure gas supply nozzle throat part 5,56,72 Ground material supply port 6,55 Crushed material supply cylinder 7,57 High-pressure gas supply port 8,58 High-pressure gas chamber 9.59 High-pressure gas introduction pipe 10,24,60,73 Accelerator pipe outlet 11,25,61,74 Collision member 12,62 Collision member support 13, 63, 78 Crushing chamber 14, 27, 64, 82 Crushed material discharge port 15, 28, 65, 77 Crushing chamber side wall 16, 66, 75 Protruding central part 17, 67, 76 Outer peripheral collision surface 18, 29, 68, 83 powder raw material 21,72 ground material supply port 22,79 high pressure gas supply nozzle 26 collision surface

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masakichi Kato 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (2)

[Claims] 1. An accelerating pipe for conveying and accelerating an object to be crushed by a high-pressure gas, and a crushing chamber for finely crushing the object to be crushed, and an opening surface of an outlet of the accelerating tube in the crushing chamber. In a collision type air flow crusher equipped with a collision member having a collision surface facing each other, at the rear end of the accelerating tube, there is a crushed object supply port for supplying the crushed object into the accelerating tube. The collision surface has a protruding central portion, and the outer peripheral collision surface has a cone shape, and the crushing chamber further crushes the object to be crushed by the collision member by collision. For the high pressure gas supply nozzle having a throat diameter a (> 0), the nozzle length L ₁ (≧ 0), and the acceleration pipe length L ₂
(> 0) and the relational expression of the closest distance L ₃ (> 0) between the apex of the protruding central portion of the collision member and the outer peripheral collision surface is 2 (L ₁ + L ₃ ) / 3 <L ₂ <3 · L ₃ . Yes, the divergence angle θ ₁ of the high pressure gas supply nozzle is 0 ° ≤ θ
₁ ≦ 20 ° range _{a + 2 · L 1 tan (} θ 1/2) <b <c / 2 condition is (b:: accelerating tube throat diameter, c protrusion bottom diameter having a cone-shaped collision member) A collision type airflow crusher characterized by satisfying. 2. The spread angle θ _{2 of the} acceleration tube is 0 ° ≦ θ ₂
≦ 20 DEG _{b + 2 · L 2 tan (} θ 2/2) <c <d: at the same time to satisfy the (d outer peripheral colliding surface diameter) is a condition, the apex angle theta ₃ and the outer periphery of the projecting central portion of the collision member The apex angle θ ₄ of the collision surface is 0 ° <θ ₃ <9
0 ° <θ ₃ <θ ₄ <180 ° at 0 _{DEG, d + 2 · L 3 tan} (θ 3/2)>e> d (e: grinding chamber _{diameter, c = 2 · L 3 tan} (θ _3/2)) grinding machine according to claim 1, characterized by satisfying the condition it is.