JP2003010712A - Method for pulverizing raw material such as powder and granular substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for pulverizing a raw material such as powder and a granular substance into finer particles. SOLUTION: The raw material is pulverized by supplying the raw material through a feeding port 8 into a casing 2 provided with the first rotary blade 5 and the second rotary blade 6 each of which has a plurality of blades on the periphery of a boss and which are opposite to each other, moving the supplied raw material by the air current generated by rotating the blades 5 and 6, adjusting the state of the air current by changing the operation conditions such as air sucking pressure and air flow rate of an air sucking unit 10 communicating with the casing 2 and forcing the particles of the raw material moving on the air current to collide with one another, to collide with the inside surface of the casing 2 or to collide with each of the blades 5 and 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing method capable of efficiently pulverizing powdery or granular raw materials such as agricultural products and minerals into raw material particles having a desired particle size.

[0002]

2. Description of the Related Art As one of the pulverizing methods for pulverizing raw materials such as agricultural products and minerals to a very small size, the powder or particles of the raw material to be pulverized are placed in an air stream generated in a pulverizer and moved to separate the raw material particles from each other. There is a so-called gas crushing method in which crushing is performed by collision. In this pulverizing method, by rotating both rotary blades in a casing provided with a first rotary blade and a second rotary blade having the same shape in a state of facing each other, an airflow is generated around each rotary blade, and each airflow is generated. By colliding with each other, the raw material particles moving along with each air flow are made to collide with each other to perform pulverization.

[0003]

However, when this pulverizing method is carried out, the raw material can be finely pulverized, but if a part of the raw material contains particles extremely larger than the desired pulverized particle size, the desired pulverized particle size is desired. Since it takes a long time to pulverize to the pulverized particle size, the efficiency cannot be said to be sufficient. Further, it is difficult to obtain an optimum air flow according to the characteristics such as the particle size of the raw material, the hardness and softness, or the degree of the desired particle size, and it is difficult for the conventional crushing method to achieve efficient crushing. could not.

The present invention has been proposed in view of the above, and an object thereof is to provide a pulverizing method having excellent raw material pulverizing efficiency.

[0005]

The present invention has been made to achieve the above object, and the invention according to claim 1 is the first rotor blade and the second rotor blade provided with a plurality of blades. By supplying the raw material from the first rotor vane side into a casing provided with the two in a state of facing each other, moving the raw material on the airflow caused by the rotation of both rotor vanes, and changing the operating conditions of the suction device in communication with the casing. The powder characterized by adjusting the state of the air flow in the casing, and crushing the raw material by colliding the particles of the raw material moving along with the air flow, or the particles and the inner surface of the casing, or the particles and each rotor blade. It is a method of pulverizing raw materials such as bodies and granules.

According to a second aspect of the present invention, the raw material is supplied from the first rotor blade side into a casing provided with the first rotor blade and the second rotor blade provided with a plurality of blades facing each other, and both rotors are rotated. The raw material is placed on the airflow due to the rotation of the blades to move, and the state of the airflow in the casing is adjusted by changing the rotational speed of at least one of the first rotary blade and the second rotary blade, and the airflow is carried on this airflow. A raw material pulverizing method for pulverizing a raw material by colliding the raw material particles with each other, the particles with the inner surface of the casing, or the particles with each rotor, to pulverize the raw material.

According to the third aspect of the present invention, the state of the air flow in the casing is adjusted by changing the gap between the tip of at least one of the first rotary blade and the second rotary blade and the inner surface of the casing. It is a raw material pulverizing method for powders, granules or the like according to claim 1 or 2.

According to a fourth aspect of the present invention, by changing the distance between the first rotary blade and the second rotary blade that face each other,
The raw material crushing method for powder, granules, etc. according to any one of claims 1 to 3, wherein the state of the air flow in the casing is adjusted.

According to a fifth aspect of the present invention, the casing is an intermediate casing member that connects the first side casing member on the side of the first rotor blade, the second side casing member on the side of the second rotor blade, and the side casing member on both sides. And at least one of the first rotor blade and the first side casing member or the second rotor blade and the second side casing member is movable in the axial direction, and the intermediate casing member having a different width is formed. 5. The state of the air flow in the casing is adjusted by exchanging the first rotor blade and the second rotor blade, which are opposed to each other, with a gap between the first rotor blade and the second rotor blade facing each other. The method for pulverizing raw materials such as powder and granules described in 1.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, an outline of the crusher 1 for carrying out the crushing method of the present invention will be described. Of course, the crusher 1 does not limit the present invention. FIG. 1 is a cross-sectional view of a crusher 1 which is an embodiment for carrying out the present invention, and FIGS. 2 and 3 are enlarged cross-sectional views of main parts of the crusher 1.

The crusher 1 has a casing 2 in which a first rotary blade 5 and a second rotary blade 6 which are rotationally driven by motors 3 and 4 are coaxially opposed to each other. 7, the feed port 8 for the raw material to be crushed is communicated with the first rotary blade 5 side of the casing 2, and is connected to the second rotary blade 6 side of the casing 2 from the rotation center of the spindle of the second rotary blade 6. The exhaust port 9 is connected to a close position, and a suction device 10 is connected to the exhaust port 9 to be provided.

The casing 2 is a cylindrical member whose both ends are laterally closed, and the inner diameter of the central portion in the axial direction is made the same, and the left and right corners thereof are inclined so that the inner diameter gradually increases from the left and right ends toward the center. 1 inclined inner peripheral surface 21 and second
An inclined inner peripheral surface 22 is formed. And casing 2
A first bearing 23 is provided at the center of the left end of the first rotor 23. The first bearing 23 rotatably supports the first support shaft 24 of the first rotary blade 5, and the seal ring 25 supports the first bearing 23 and the crushing chamber 7. It is provided between and to prevent the raw material particles from entering the first bearing 23. Further, at the right end portion of the casing 2, the vicinity of the center is extended outward in the axial direction and the extended cylinder inner peripheral portion 26 is provided.
And the second bearing 27 is formed outside the inner peripheral portion 26 of the extending cylinder.
The second bearing 27 rotatably supports the second support shaft 28 of the second rotary blade 6, and the seal ring 29 is provided between the second bearing 27 and the crushing chamber 7. The material particles are prevented from entering 27.

The casing 2 has a boundary between a cylindrical inner peripheral surface 41 having the same inner diameter and a first inclined inner peripheral surface 21 on the inlet 8 side, and a second inclined inner peripheral surface 22 on the outlet 9 side and a cylinder. The first side casing member 42 having the first inclined inner peripheral surface 21 formed therein, the intermediate casing member 43 having the cylindrical inner peripheral surface 41 formed therein, and the second inclined inner surface made separable from the boundary with the cylindrical inner peripheral surface 41. Second side casing member 4 having a peripheral surface 22 formed
It can be separated into 3 members of 4.

As described above, the first lateral casing member 42 has the first inclined inner peripheral surface 21 whose inner diameter gradually increases from the left end, and the convex portion 46 is formed in a ring shape at the right open end. Form. Then, the first inclined inner peripheral surface 21 opens an opening (communication opening) for communicating the charging opening 8. The first side casing member 42 is installed on the slide base 51 together with the motor 3, and the slide base 51 is slidably arranged on a rail 53 provided on the base 52. The rail 53 is provided on the base 52 in parallel with the rotation axis. Therefore, the slide base 51, the first side casing member 42, and the like can move in the rotation axis direction. Note that the slide base 51 includes the ball screw 55 and the motor 56 in this embodiment.
Although the mechanism for moving by means of and is used, the mechanism is not limited to this.

The intermediate casing member 43 is formed with a ring-shaped plane perpendicular to the rotation axis at a portion contacting the first side casing member 42, and a recess 58 is formed inside the ring-shaped plane.
Are provided in a ring shape. The recess 58 has an inner diameter that can be fitted to the outer diameter of the protrusion 46 of the first lateral casing member 42, and has a depth the same as the height of the protrusion 46. Therefore, when the intermediate casing member 43 and the first lateral casing member 42 are brought into contact with each other, the concave portion 58 and the convex portion 46 are fitted to each other, and the tip end surface of the convex portion 46 is brought into contact with the bottom surface of the concave portion 58 without a gap. You can Therefore, it is possible to prevent the raw material particles in the crushing chamber 7 from leaking out from between the intermediate casing member 43 and the first lateral casing member 42.

The intermediate casing member 43 also has a ring-shaped flat surface perpendicular to the rotation axis at the portion contacting the second side casing member 44, and a recess 59 is formed inside the ring-shaped flat surface. To be installed. The recess 59 is similar to the recess 58 in that the second side casing member 4 will be described later.
It can be fitted with the convex portion of No. 4.

As described above, the second lateral casing member 44 has the second inclined inner peripheral surface 22 whose inner diameter gradually increases from the right end, and extends axially outward near the center of the right end. To form the extending cylinder inner peripheral portion 26. The extension cylinder inner peripheral portion 26 is provided with an opening portion (discharge opening communication opening) 61 communicating with the discharge opening 9. The discharge port 9 connects the suction device 10 via the connection flow path 62. In addition, this suction device 10
Is configured so that operating conditions such as suction pressure and suction flow rate can be changed.

Further, the second side casing member 44, like the first side casing member 42, has a convex portion 64 at a portion contacting the intermediate casing member 43, that is, at the left open end.
Is formed into a ring shape. Then, the second side casing member 44 and the motor 4 are fixed to the base 52, and are arranged so that the rotation shaft centers of the motors 3 and 4 and the shaft centers of the support shafts 24 and 28 are aligned.

Thus, the first side casing member 42,
A ring-shaped convex portion 64 that constitutes the intermediate casing member 43 and the second casing member and is formed at the open end of the second lateral casing member 44, and one open end of the intermediate casing member 43 (right side in the figure). ) Is engaged with the ring-shaped recess 59 formed in the first side casing member 4
When the slide base 51 on which 2 is installed is moved toward the second side casing member 44, the ring-shaped protrusion 46 formed at the opening end of the first side casing member 42.
And a ring-shaped recess 58 formed at the other open end portion (left side in the figure) of the intermediate casing member 43 are engaged with each other, and the intermediate casing member 43 becomes the first side casing member 42 and the second side casing. It is attached in a state of being sandwiched between the member 44.

In this embodiment, the slide base 51 and the moving mechanism are provided on the first side casing member 42 so that the first side casing member 42 can be moved. However, the present invention is not limited to this, and the first side casing member 42 can be used as a base. Even if it is fixed to 52 and the second side casing member 44 is provided with a slide base and a moving mechanism so as to be movable, the same effect can be obtained. Further, a slide base and a moving mechanism may be provided on both side casing members 42 and 44, respectively.

Next, the rotary blades 5 and 6 will be described. First
The rotary vane 5 has six blades 69 ... Radially attached to a boss 68 fixed to the tip of the first support shaft 24. The blades 69 ... Are arranged at equal intervals in the circumferential direction of the boss 68. There is.
Similarly, in the second rotary blade 6, six blades 71 are radially attached to a boss 70 fixed to the tip of the second support shaft 28, and each blade 71 is arranged in the circumferential direction of the boss 70. They are arranged at equal intervals. Although the number of blades 69, 71 can be set as appropriate, the blades 69, 69 may be changed due to the passage of the air flow described later.
It is desirable to set the space between the blades 71 and 71 wide.

As shown in FIG. 3, the blades 69 ..., 71 ...
And the second blade inclined surface 76 are formed. The inclination angles of the first blade inclined surfaces 75 ... Are set to be the same as the inclination angle of the first inclined inner peripheral surface 21 with respect to the rotation axis. Second blade inclined surface 76
Similarly to the first blade inclined surface 75, the inclination angle with respect to the rotation axis is set to the same angle as the inclination angle of the second inclined inner peripheral surface 22. In the present embodiment, each of the above angles is set to 4
It is set to 5 degrees. Further, the tip surfaces 77, 78, ... Of the blades 69, ..., 71 are formed so as to be parallel to the rotation axis and also parallel to the cylindrical inner peripheral surface 41 of the intermediate casing member 43.

When the first rotary blade 5 and the second rotary blade 6 are attached to the crusher 1, the first blade inclined surfaces 75 ... and the first inclined inner peripheral surface 21 face each other in parallel, and similarly, The second blade inclined surface 76 ... And the second inclined inner peripheral surface 22 face each other in parallel,
The gaps 81a ..., 82a. And these gaps 81a ..., 82a ...
Are available as part of the grinding chamber 7 through the air flow and particles. Since these gaps 81a ..., 82a ... Are each a constant gap, the air flow is a gap 81a.
Therefore, it is possible to easily maintain the air flow velocity in the direction along the inclination of each of the inclined inner peripheral surfaces 21, 22 while being not narrowed down while passing through. Similarly to the blade inclined surfaces 75, 76, the tip surfaces 77, 78 of the blades 69, 71, and the cylindrical inner peripheral surface 41 face each other in parallel, and a gap having a constant interval. 81b ..., 82b ... Are formed. Then, these gaps 81b ..., 82b ... Can be utilized as a part of the crushing chamber 7 through the air flow and particles. These gaps 81b
, 82b ..., the airflow is not narrowed down, so that the airflow velocity in the rotation axis direction can be easily maintained.

It is desirable that the rotational speed of each of the rotary blades 5 and 6 can be appropriately changed, for example, 3000 to 10000 rpm so that the frequency of particle collision during rotation can be controlled.

By the way, in the crusher 1 of this embodiment, spacers 84 and 85 are attached to the attachment portions of the rotary blades 5 and 6 of the support shafts 24 and 28, respectively. These spacers 8
Reference numerals 4 and 85 are for adjusting the mounting positions of the rotary blades 5 and 6 in the rotation axis direction.
It is a cylindrical member that is provided so as to be fitted to 4, 28. Then, these spacers 84, 85 and the respective rotary blades 5,
Each of the support shafts 24 and 28 to which the 6 is attached has rotor blade mounting portions 86 and 87 reduced in diameter at the tips thereof, and abutting portions are provided to the base portions of the rotor blade mounting portions 86 and 87.

The spacers 84 and 85 and the respective support shafts 24 and 28 are constructed in this manner, and the spacer 84 is fitted to the rotary blade mounting portion 86 of the support shaft 24 so that one opening end of the spacer 84 and the support shaft 24. And the contact portion of the rotary blade mounting portion 86 of the above.
Then, the rotary blade 5 is attached to the rotary blade mounting portion 86 of the support shaft 24, and the boss 68 of the rotary blade 5 and the other open end portion of the spacer 84 are brought into contact with each other. Similarly, the spacer 85 is fitted to the rotary blade mounting portion 87 of the support shaft 28, and one open end of the spacer 85 is brought into contact with the contact portion of the rotary blade mounting portion 87 of the support shaft 28. The rotary blade 6 is attached to the rotary blade mounting portion 87 of the support shaft 28.
Then, the boss 70 of the rotary blade 6 and the other open end of the spacer 85 are brought into contact with each other. Then, each rotor 5,6
The spacers 84, 8 at the mounting positions on the support shafts 24, 28.
5, it is possible to adjust the gap G between the rotary blades 5 and 6. At the same time, each rotor 5,
6 can also be adjusted in position with respect to the casing. Therefore, the gap 81a between the first inclined inner peripheral surface 21 and the first blade inclined surface 75, and the second inclined inner peripheral surface 22 and the second blade inclined surface 7 can be adjusted.
The gap 82a with 6 can be adjusted.

Then, a plurality of spacers 84 and 85 having different cylindrical lengths (lengths in the axial direction) are prepared, and the optimum gap G and gap 81a are selected from these spacers 84 and 85 according to the characteristics of the raw material to be treated. , 82a can be set and the spacers 84, 85 can be attached to the support shafts 24, 28 to easily adjust the gap G. At the same time, the inclined inner peripheral surfaces 21, 22 of the casing and the respective inclined inner peripheral surfaces 21, 22 can be adjusted. Wing slope 7
It is possible to easily adjust the gaps 81a ..., 82a.

A plurality of intermediate casing members 43 having different cylindrical lengths (lengths in the axial direction) are prepared, and a gap G between the rotary blades 5 and 6 suitable for the raw material characteristics is selected from the intermediate casing members 43. Intermediate casing member 43 that can be set
Is selected and attached by sandwiching it between the first side casing member 42 and the second side casing member 44, it is possible to set an interval G of a width that cannot be adjusted by the spacer, so that a wider range can be set. It is possible to meet the crushing conditions of.

Next, the crusher 1 having the above-mentioned structure
A method of pulverizing raw materials such as powder and granules will be described using. First, the case where the first rotary vane 5 and the second rotary vane 6 are rotated in the same direction while operating the suction device 10 will be described.

First, as a preparation for crushing raw materials, the crushing chamber 7
The internal space and the suction device 10 are adjusted. Grinding room 7
For the internal space, the spacers 84 and 85 and the intermediate casing member 43 are selected and attached to the crusher 1, and the space G between the rotary blades 5 and 6 and the casing 2 and each blade 69 ...
The gaps 81a, ..., 82a ... with 1 are adjusted according to the characteristics of the raw material to be crushed. When the adjustment of the space in the crushing chamber 7 is completed, the convex portion 46 of the first side casing member 42 is
And the concave portion 58 of the central casing member 43, and the convex portion 64 of the second lateral casing member 44 and the central casing member 4
Assemble the casing 2 by fitting the recess 59 of the
The rotating blade 5 and the second rotating blade 6 are rotated in the same direction by the motors 3 and 4 to generate an air flow in the casing 2.

Then, the suction device 10 is operated, and the suction device 1 is considered in consideration of the raw material to be crushed and the desired crushed particle size.
The state of the airflow generated in the casing 2 is adjusted by changing the operating conditions such as the suction pressure of 0 and the suction flow rate. For example, when the raw material particles include particles that are extremely larger than the desired crushed particle size, the suction pressure is set to a small value so that these extremely large particles are not immediately discharged from the discharge port 9. That is, when the particles stay in the casing 2,
The rotary blades 5 and 6, especially the first rotary blade 5, are set so as to frequently collide with each other.

As described above, the suction device 1 is selected according to the characteristics of the raw material.
After changing the operating condition of 0 to adjust the air flow in the casing 2, the raw material powder is charged from the charging port 8 to start crushing.
Then, this raw material powder enters the crushing chamber 7 on the side of the first lateral casing member 42 through the opening 47, and then passes through the gap between the blades 69 of the first rotary blade 5 ... Particles are circulated around the first rotor blade 5 along with the airflow generated by the rotation of the blades 69, and some particles are attracted to the second rotor blade 6 side, and similarly, the second rotor blade 6 is rotated. Circulate around the wings 6. Since the circulation orbit of the first rotor 5 (that is, the circulating air flow) and the circulation orbit of the second rotor 6 in the crushing chamber 7 have velocity components in opposite directions to each other, the particles on each circulation orbit collide with each other. Or subjected to shear stress and crushed (gas crushing).

Of the charged raw materials, for example, particles that have a large mass and are hard to ride in the airflow collide with the side surfaces of the rotating first blades 5 5 ... The raw material particles that have collided with the first rotor 5 are subjected to a centrifugal force because they rotate in the same direction as the first rotor 5, collide with the casing inner peripheral surfaces 21, 41 (casing inner surface), and are ground again. Further, it rebounds and collides again with the wing 69 of the first rotary blade 5 ... Side surface. The pulverization by these collisions is repeated until the particles reach the size of the circulating air flow, and when the particles become the size of the circulating air flow, the process proceeds to gas pulverization.

Then, some of the particles transferred to the gas pulverization move to the side of the second rotary blade 6 by the suction force of the suction device 10 and also ride on the circulating air flow generated around the second rotary blade 6. It will be easier. Around the second rotary blade 6, the air flow circulates in the space including the gaps 82a ... Then, in the space where the airflow due to the rotation of the first rotor 5 intersects, that is, the space between the first rotor 5 and the second rotor 6, the airflows facilitate the collision of particles. In addition, a space where air flows of different speeds flow in parallel,
For example, in the gaps 82a, a velocity gradient of the air flow is generated between the rotating second blade inclined surfaces 76 and the second inclined inner peripheral surface 22, shear stress is generated in the gas, and the particles are separated from each other. Friction is likely to occur. Therefore, gas pulverization can be promoted.

Particles finely pulverized to a desired pulverized particle size, for example, on the order of submicron by the gas pulverization, have a small mass, and thus are sucked along the rotation center line of the second rotor 6 and discharged. It is discharged from the outlet 9 and the connection flow path 6
It is collected in a collecting unit (not shown) through the item 2.

That is, by changing the rotation speed of each of the rotor blades 5 and 6 or changing the operating conditions of the suction device 10 to change the crushing conditions such as the crushing time and the state of the air flow, the charged raw material is changed. The desired crushed particle size can be obtained by adjusting the crushing degree of. Similarly, the pulverization degree of the raw material can be adjusted by changing the amount of the raw material input to the pulverizer 1.

Further, in the above embodiment, while the suction device 10 is operating, the first rotary blade 5 and the second rotary blade 6 are rotated in the same direction, and the raw material is charged from the charging port 8 to pulverize the raw material. However, the present invention is not limited to this. For example, when the raw material is introduced through the inlet 8 while the rotary blades 5, 6 are rotated in the same direction without operating the suction device 10 from the beginning, a suction force for guiding the raw material particles to the outlet 9 is generated. However, the raw material particles are more likely to collide with the first rotor blade 5 and more likely to be subjected to centrifugal force, which is preferable. Then, the crushing efficiency can be improved by operating the suction device 10 after the crushing due to the collision between the first rotary blades 5 and the raw material particles is performed to some extent. Even when the rotary blades 5 and 6 are rotated in the opposite directions, the crushing efficiency can be similarly improved.

Next, the case where the first rotary blade 5 and the second rotary blade 6 are rotated in opposite rotation directions will be described. The space in the crushing chamber 7 is adjusted in the same manner as described above, the first rotary blade 5 and the second rotary blade 6 are rotated in opposite rotational directions, and the suction device 10 is changed to operating conditions according to the characteristics of the raw material so that the casing 2 Adjust the air flow inside. Then, when the raw material is charged from the charging port 8,
As in the case of the same rotation direction, this raw material enters the crushing chamber 7 on the side of the first side casing member 42 through the opening 47.
Then, the particles pass through the gap between the blades 69 of the first rotor 5, and some of the particles ride on the airflow generated by the rotation of the blades 69 and circulate around the first rotor 5, and Some particles are attracted to the second rotary blade 6 side and circulate around the second rotary blade 6.

Further, the first rotor 5 in the crushing chamber 7
And the circulating airflow of the second rotating blade 6 have velocity components in opposite directions, and the rotating blades 5 and 6 rotate in opposite directions. Therefore, not only the radial direction but also the rotation direction has a reverse velocity component. Therefore, a larger shearing stress is generated than in the case of rotation in the same direction, so that the grinding efficiency can be improved.

After that, as in the case of the same rotation as described above, the pulverized particles having a small mass are sucked along the rotation axis of the second rotary blade 6 and discharged from the discharge port 9 to be connected. It is recovered by a recovery unit (not shown) through the flow path 62.

In the above embodiment, the spacers 84, 85 having different cylindrical lengths or the intermediate casing member 43 are selected and attached to the crusher 1, the gap G between the rotary blades 5 and 6 and the first casing 2 are provided. The gap 81a between the inclined inner peripheral surface 21 and the first blade inclined surface 75 of the first rotor 5, the second inclined inner peripheral surface 22 of the casing 2 and the second blade inclined inner peripheral surface 76 of the second rotor 6. By changing the gap 82a ...
Although the state of the airflow in the crushing chamber 7, that is, the casing 2 is adjusted, the condition is not limited to this. For example, a plurality of first rotary blades 5 and second rotary blades 6 are separately prepared by changing the shape dimensions such as the blade diameter and the blade width, and selected from these rotary blades and attached to the crusher 1. Interval G or the gap 81a ..., 81b
, 82a ..., 82b ... may be changed to adjust the state of the air flow according to the characteristics of the raw material to be crushed. This is preferable because the gap between the tip end surface of each of the rotary blades 5 and 6 and the cylindrical inner peripheral surface 41 can be adjusted, so that the adjustment range of the air flow state is widened.

Further, the inclination angles of the inclined inner peripheral surfaces 21, 22 and the blade inclined surfaces 75, ..., 76 may be such that the opposing surfaces are positioned in parallel, and the angle with respect to the rotation axis is the same as the above embodiment. The form is not limited to 45 degrees.

[0043]

As described above, the present invention has the following effects. By adjusting the operating conditions of the suction device that communicates with the casing, the state of the air flow inside the casing is adjusted, and the raw material particles are crushed by colliding the raw material particles with each other, or with the particles inside the casing, or with the rotor blades. Since this is done, even if raw material particles much larger than the desired crushed particle diameter are charged, they will stay in the casing and be crushed. Therefore, it is possible to shorten the time for the raw material particles in the casing to be pulverized to a desired particle diameter, and thus it is possible to improve the efficiency of gas pulverization.

Further, by changing the rotational speed of at least one of the first rotary blade and the second rotary blade, the state of the air flow in the casing is changed to pulverize the raw material, so that the raw material particles easily collide. An air flow can be generated in the casing, and gas pulverization can be efficiently performed.

A gap between the tip of at least one of the first rotary blade and the second rotary blade and the inner surface of the casing, and the first rotary blade
By changing the distance between the rotary blade and the second rotary blade to change the state of the air flow in the casing to pulverize the raw material, the space in the casing serving as the pulverization chamber, that is, the space in which the air flow is generated, is the raw material. The gas pulverization can be efficiently performed by adjusting according to the characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view of a crusher.

FIG. 2 is an enlarged cross-sectional view of a main part of the crusher.

FIG. 3 is an enlarged cross-sectional view of the inner peripheral surface of each casing member and each blade.

[Explanation of symbols]

1 crusher 2 casing 3 motor 4 motor 5 First rotor 6 Second rotor 7 Grinding room 8 slot 9 outlet 10 Suction device 21 First inclined inner peripheral surface 22 Second inclined inner peripheral surface 23 First bearing 24 1st support shaft 25 seal ring 26 Inner peripheral part of extension cylinder 27 Second bearing 28 Second support shaft 29 seal ring 41 Cylindrical inner peripheral surface 42 First Lateral Casing Member 43 Intermediate casing member 44 Second Side Casing Member 46 convex 47 opening (opening for communication with input port) 51 slide base 52 base 53 rails 55 ball screw 56 motor 58 recess 59 recess 61 Opening part (exhaust port communication opening) 62 connection flow path 64 convex 68 Boss 69 wings 70 Boss 71 wings 75 First blade slope 76 Second blade slope 77 Tip surface 78 Tip surface 81a, 81b gap 82a, 82b gap 84 spacer 85 spacer 86 Rotor blade mounting part 87 Rotor blade mounting part G Distance between both rotors

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sadatoshi Kojima             2-16 Noguchi-cho, Higashimurayama-shi, Tokyo 2 days             Kiso Co., Ltd. Higashimurayama Works F-term (reference) 4D063 FF14 FF23 GA03 GA07

Claims (5)

[Claims] 1. A raw material is supplied from the side of the first rotary blade into a casing having a first rotary blade and a second rotary blade provided with a plurality of blades facing each other, and the raw material is supplied to an air flow generated by the rotation of both rotary blades. By moving the operating conditions of the suction device in communication with the casing, the state of the air flow in the casing is adjusted, particles of the raw material moving on the air flow, or particles and the inner surface of the casing, or A raw material pulverizing method for powders, granules and the like, characterized in that the raw material is pulverized by colliding particles with each rotary blade. 2. A raw material is supplied from the side of the first rotary blade into a casing having a first rotary blade and a second rotary blade provided with a plurality of blades facing each other, and the raw material is supplied to an air flow generated by the rotation of both rotary blades. By moving the first rotor blade and / or the second rotor blade to change the rotational speed of at least one of the first rotor blade and the second rotor blade, thereby adjusting the state of the air flow in the casing. And a casing inner surface, or particles are made to collide with each rotary blade to pulverize the raw material, and a raw material pulverizing method for powders, granules and the like. 3. The state of the air flow in the casing is adjusted by changing the gap between the tip of at least one of the first rotary blade and the second rotary blade and the inner surface of the casing. A raw material pulverizing method for the powder, granular material or the like according to claim 2. 4. The state of the air flow in the casing is adjusted by changing the distance between the first rotary blade and the second rotary blade facing each other. A method for pulverizing a raw material such as the powder and granules described. 5. The first casing on the first rotor vane side is provided with the casing.
A side casing member, a second side casing member on the side of the second rotor blade, and an intermediate casing member connecting the side casing members are separately configured to form the first rotor blade and the first side casing member, or the second side casing member. At least one of the rotor blade and the second side casing member is movable in the axial direction, the intermediate casing member is replaced with one having a different width, and the distance between the first rotor blade and the second rotor blade facing each other is changed. Accordingly, the state of the air flow in the casing is adjusted, and the raw material pulverizing method for powder, granules or the like according to any one of claims 1 to 4.